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One-step Process for AKD Neutral Sizing Emulsion Preparation

刘士亮 — 2016/1/29 15:21:39

Based on the traditional AKD neutral sizing emulsion preparation technology, one-step process for AKD neutral sizing emulsion preparation including its technology and equipment was introduced in this paper.

TCF Bleaching of AS-AQ Pulp of Corn Stalk Cuticle

孟　毅,张世杰,张运展 — 2016/1/29 15:20:14

This paper discussed the TCF bleaching for AS-AQ pulp of corn stalk cuticle. The results showed that the brightness of AS-AQ pulp after pretreatment of acid DTPA and Op stage reaches 77.4% ISO. The brightness of the pulp reaches 81.4% ISO after further bleaching with hydrogen peroxide bleaching.The brightness of the pulp from Op stage and further bleaching with sodium dithionite reaches 80.6% ISO. The brightness of the pulp can increase by 7.8 percentage points through the bleaching process of Op-P-Y, and its bleaching effect is better than the bleaching process of Op-Y-P.

Modification of Hydroxymethyl Lignin and the Effect the Product on Paper Strength

张美云,曹建武,李金宝 — 2016/1/29 14:58:03

Graft copolymerization of hydroxymethyl lignin and acrylamide with H2O2-Fe(Ⅱ) as initiator was studied. The effects of dosages of acrylamide and initiator, reaction temperature, reaction time on grafting ratio were investigated. The structure of copolymer was analyzed by FT-IR and the copolymer was added into pulp to study its effect on resultant paper properties. The optimum process parameters of the grafting reaction were as follows: the mass ratio of acrylamide to hydroxymethyl lignin is 1.5, the mass ratio of initiator to hydroxymethyl lignin is 0.06, the reaction temperature and time are 60℃ and 3 h respectively.

Preparation of Concrete Water-reducer by Oxidation and Sulfomethylation of Bamboo Pulping Black Liquor

2016/1/29 14:55:46

Lignosulfonate was prepared as water-reducer via oxidation and sulfomethylation of bamboo alkaline-pulping black liquor. Results indicated that the water-solubility and surfactivity of lignin in black liquor can be effectively improved through the modification. The prepared lignosulfonate can be employed as a cost-effectively water-reducer in concrete industry, since it can reduce cement slurry viscosity so as to increase the fluidity by means of dispersing cement slurry floc and releasing the bound water. This work shows great significance in pollution prevention and the reuse of black liquor.

Effect of Enzymatic Pretreatment on Beatability of Bleached Softwood Pulp

2016/1/29 15:46:35

Pretreatment with endo-cellulose before beating can reduce beating energy consumption. However, the effect is quite different when the enzyme is utilized to different fiber raw materials. Three kinds of bleached softwood pulps were pretreated with endo-cellulose N476, and the data of beating degree, water retention value, and contact angle were compared and analyzed. The results showed that the pulps which have thin cell wall, long fiber and wide lumen can get higher values of drainability, wettability, surface area and beating degree after pretreatment.

Effect of Cellulases Pre-treatment of Bleached Softwood Pulp on Beating Energy Consumption and Pulp Properties

王兆荣,李新平,董　璐,杜　敏 — 2016/1/29 15:45:37

The effect of celluloses pretreatment of softwood pulp before beating on beating energy consumption, fiber morphology, paper properties was studied in this paper. The effects of different dosage of enzyme on beating energy consumption and the pulp property were investigated. The results showed that pretreatment with cellulases before beating can reduce beating energy comsumption and improve pulp properties.

Production of Bleached Kraft Pulp Using Moso Bamboo Leftover Material

蒙衍强,谢鸿武 — 2016/1/29 15:44:52

Both of the lab experiment and production trial test of kraft pulping using Moso bamboo leftover as material were carried out. The results indicated that: Moso bamboo leftover can be used for the raw material of bamboo pulp, and the chemical pulp can meet the technical requirments of the medium and high grade paper products such as cultural papers etc. And in order to guarantee the quality and production cost of bamboo pulp, the nodes rate of Moso bamboo leftover material should be in control of less than 20%, the highest should not be exceeded 25%.

Application of the Chelating Agent in White Mud Refining

卞　勇 — 2015/11/23 13:35:10

The white mud from chemical recovery process of kraft pulping normally is greenish. The whiteness of precipitated calcium carbonate prepared from the white mud by the reported technology didn’t meet the requirement of paper making. The whiteness of the precipitated calcium carbonate is above of 90%ISO by adding 1 mL DTPMP in the white mud at 35℃ and pH=9.5 based on orthogonal experiment.

A New Type of Disc Refiner Plate and Its Manufacture Method

梁钱华 — 2015/11/23 13:35:10

In this paper, a novel structure and manufacture method of a new type of disc refiner plate are introduced. The bars of the plate are arranged in a given rule, which is beneficial to pulp flowing and plate manufacting.

The Effect of the Proportion of Poplar APMP on Physical Properties of Yellow Writing Paper

2015/11/23 11:54:47

The properties of yellow writing paper were studied by changing the proportion of poplar APMP in paper furnish. These properties included L*a*b*, physical strength and ash content. The results revealed that the brightness decreased, a* kept stable, and b* increased by increasing the proportion of poplar APMP in paper furnish. The bulk of paper was significantly improved, both the tensile and burst indexes decreased. The change of ash content was insignificant.

Determination of Total Alkali, Active Alkali and Effective Alkali in White Liquor by Potential Titration

张信旭,梁小杰 — 2015/11/23 11:38:17

The automatic potential titration method for determining total alkali, active alkali and effective alkali in white liquor was introduced. The method can titrate directly continuously without adding agents such as BaCl2 and formaldehyde as the conventional method, the end point of titration can be easy to judge from pH value. The method has advantages of easy operation, quick determination and high accuracy.

Preparation of Light-weight Packaging Paper with CMP from Tobacco Stalk

沈靖轩,陈　婉,刘润昌,马　涛,尧珍玉,温光和 — 2015/11/23 13:52:00

Based on fiber length, fiber width, length-width ratio and chemical constitution analysis of the tobacco stalk and determination of the pulp yield, pulp brightness and tensile strength of the paper sheet made from the pulp, the tobacco stalk CMP pulping process including pretreatment duration, temperature and chemical charge was optimized. In addition, the pulp obtained under the optimized conditions was used to prepare paper sheet with various proportions of bleached hardwood pulps. The results indicated that CMP made from tobacco stalk had a good performance in light-weight paper, which showed relatively high tensile strength, folding endurance and elongation. The paper sheet, containing 20% CMP, showed higher tensile strength and elongation which met the demand of base paper for inner backing paper used in cigarette package.

Utilization of Chemical Additives in Hypochlorite Bleaching

2015/11/23 13:41:27

Utilization of bleaching additives in production practice was studied, the results showed that, bleaching additives have good protection effect on the fibers of bamboo pulp, bagasse pulp or mixed pulp of bamboo and eucalyptus. And adding bleaching additives is helpful for the improvement of the yield of H stage, viscosity and whiteness of CEH bleaced pulp. The bleached pulp quality can be stable when small amount of bleaching additives are used in H stage.Furthermore, production cost can be reduced to certain degree.

Production of Bamboo-plastic Products from Bamboo Residus

2015/10/9 13:20:41

The composite material of high density polyethelene (HDPE) and bamboo was produced according to the proportion of 70% bamboo sawdust, 20% of HDPE and 5% of accessory ingredient. The product is accorded with requirements of the country standards and its physical and chemical properties can satisfy the requirements of the end use both indoor and outdoor. This development can convert the waste from bamboo processing enterprises to be the valuable product.

Effect of Alkali and Xylanase Pre-treatment on Properties of Wheat Straw Pulp

2015/10/9 13:20:41

Wheat straw was pretreated with alkali and alkali-xylanase, and then the alkali-xylanase pretreatment wheat straw was cooked by soda-AQ progress. The effects of alkali dosage, reaction temperature on pentosan content, yield of the wheat straw pulp and properties of wheat straw pulp were discussed. The results showed that with the increasing of alkali charge and temperature, the yield of wheat straw, the pentosan content and the wheat straw pulp Kappa number decreased, the tensile index of wheat straw pulp increased. After pretreatment process of alkali dosage 5%, temperature 70℃, the yield of wheat straw, pentosan content, Kappa number and tensile index were 77.0%, 82.9%, 10.0 and 49.3 N·m/g, respectively.

Application of Guar Gum in Tissue Paper Manufacture

王　颖 — 2015/10/9 13:16:29

This paper described the characteristics of guar gum, cationic starch and carboxyalkyl cellulose, compared the performances of non-ionic guar gum, cationic guar gum and anion guar gum, and studied the application of guar gum and mixed application of non-ionic guar gum, cationic starch and carboxyalkyl cellulose.The results indicated that adding non-ionic guar gum in tissue pulp could enhance retention and tensile.Mixed application of non-ionic guar gum, cationic starch and carboxyalkyl cellulose could also improve strength of the paper and raise the retention of filler.

Study on the Paper Used for the Ancient Paper Cultural Relics Restoration

郑冬青,张金萍,何子晨,朱庆贵,陈潇俐 — 2015/10/9 11:53:15

With the time went by, there were a lot of precious paper quality cultural heritage. The ancient paper cultural relics damaged due to the internal and external factors. Manual restoration is the common way in East Asia, so the choice of restoration paper is very important. This paper discussed a new way to prepare restoration paper, which is produced in the laboratory of Nanjing Museum.

Application of Viscose Fibre in High Porous Filter Plug Wrapping Paper

王　颖,蔡耀辉 — 2015/10/9 11:48:17

The influences of viscose fiber on porosity and tensile strength of the filter plug wrapping paper was studied by mixing viscose fibers withsoftwood pulp fibers as raw material. The results indicated that adding viscose fibers can enhance porosity to 3000 CU and the tensile strength to 50 N·m/g when the conditions are as follows: the amount of viscose fiber is 40%, beating degree of softwood pulp is 22°SR, and the dosage of the strengthening agent is 1%.

Treatment of Southern Mixed Hardwood Chemical Pulping Effluent with Zero-valent Iron

2015/10/9 11:32:27

Zero-valent iron (Fe(0)) was used for tertiary treatment of southern mixed hardwood chemical pulping effluent. Effect of pH, reaction time, reaction temperature and zero-valent iron dosage on treatment efficiency was investigated in this study. Results showed that the removal rates of chemical oxygen demand (COD_Cr) and color reached 52% and 82% respectively, and biodegradability of the effluent obviouly enhanced. Furthermore, the removal rates of lignin-derived compounds improved with Fe (0) treatment.

Deacidification of Aged Paper by Using Natural Acid Stripping Agents

2015/10/9 11:32:27

Deacidification of aged paper was studied using natural acid stripping agents. Acid papers were deacidified by soaking in the natural acid stripping agents TS3 and TS4. Effects of temperature, time and dilution ratio of the acid stripping agents on deacidification and chromaticity of the paper were investigated. Results showed that suitable raising temperature and extending time of deacidification was beneficial to enhance deacidification, but deacidification effect decreased when the acid stripping agents were diluted. After deacidification, paper chromaticity changed slightly and paper color became taupe.

Factors Influencing Smoldering Rate of Cigarette Paper

2015/10/9 11:07:55

The influences of the pulp used for cigarette paper production, basis weight of the paper, ash content, combustion agent content, and combustion method, on cigarette paper smoldering rate were studied. The results showed that the influence of the kind of the pulp is not obvious, the basis weight has quite significant influence on smoldering rate, smoldering rate increases as cigarette paper basis weight increase, cigarette paper ash content has slightly effect on smoldering rate, smoldering rate decreases as ash content increase. On the other hand, the lower combustion agent content the higher of smoldering rate, and combustion-supporting agent content has a significant effect on the dropped ash. Different smoldering rate tester has different testing result, horizontal smoldering rate testing value is higher than that of vertical smoldering instrument.

Optimal Conditions of Lignin Precipitation from Straw Pulping Black Liquor by Using Phosphoric Acid

2015/10/9 11:04:22

A process using phosphoric acid to precipitate lignin from straw pulping black liquor was investigated, the conditions were optimized, as pH=3, T=60℃, the yield of the precipitated lignin was 87%. The precipitated lignins at different pH were analyzed by infrared spectrum and ultraviolet spectral. The components of acid-precipitated lignin at pH=3 was analyzed, the result indicated that the precipitated lignin has the characteristic of fertilizer.

Application of the Cooking Penetrant in Poplar Chemical Pulping

2015/10/9 10:08:43

This paper introduces a new kind of cooking penetrant which is a kind of fatty alcohol surfactant and can be used as a cooking aid. The application of the cooking penetrant in soda anthraqulinone cooking of poplar has the benefits of reducing the pollution load，improving bleached pulp strength and reducing the pulping cost.

Development and Application of High-performance Air Filter Paper for Gas Turbine Generator

胥绍华 — 2015/10/9 13:32:47

On the basis of the operating environment of gas turbine generator sets, the technical requirements and development process of high-performance air filter paper for gas turbine generator were described in this paper. The physical properties and performance indicators of the trial product completely met the requirements.

Factors Influencing Smoldering Rate of Cigarette Paper

王　颖 — 2015/8/13 14:48:48

The influences of the kind of combustion agent, the value of PN, the kinds of filler and pulp, calcium carbonate content, porosity of the cigarette paper on cigarette paper smoldering rate were studied. The results showed that smoldering rate value of the cigarette paper adding organic acid alkali sodium was higher than that of adding organic acid alkali potassium while the dosages of combustion agent were the same. The smoldering rate decreased as cigarette paper PN value increased when the value of PN was less than 80. When the value of PN was higher than 80, the decrease of smoldering rate was not obvious. The kinds of filler and pulp slightly effect on smoldering rate. Smoldering rate decreased as calcium carbonate content increased. Smoldering rate decreased as cigarette paper porosity increased.

Application of Bio-enzymes in NS Pulping of Wheat Straw

史军伟,张奇媛 — 2015/8/13 13:53:21

This paper addressed the experiment process of bio-enzymes application in wheat straw NS pulping. Results show that, using 1.5% bio-enzymes (on the oven-dried raw material) to take place of 30%~40% ammonium sulfite could produce the pulp with similar Kappa number and largely reduced the residual ammonium in blowing, it could reduce the corrosion of the digester, the tank, and the pipeline as well as reduce the ammonia nitrogen content of the effluent.

A Design Scheme of 25t/d Black Liquor Gasification Combined with Paper Sheet Drying

农光再,邓　卓,陈溢一,王双飞* — 2015/8/11 0:00:00

Using black liquor gasification gas to substitute a part of fuel for paper sheet drying could save the cost of fuel and increase economic efficiency and competitiveness of the enterprise. A design scheme of black liquor gasification combined with paper sheet drying was formulated in this paper. The equipments of the project consisted of black liquor gasification system and paper drying system. The technological process was designed as the follows：the gasification gas was produced in the gasifer, and consequently treated with cooling and desulfurization, thereby the purified gasification gas was obtained. The purified gas could be burned as fuel in furnace to heat up the air to 230～240℃. Then the hot air was blown to the wet sheet on the surface of dryer via a heatedair hood to increase drying rate of the paper sheet.

Comparison of the Influencing Factors of Two Testing Methods for Smoldering Rate of Cigarette Paper

温思茹,赵小松,李瑞晨,邹中亮 — 2015/8/13 16:18:13

This paper compared the influencing factors of two testing methods for smoldering rate of cigarette paper. It was shown that when using method Y, the smoldering rate of cigarette paper became slow with the basis weight increasing, and fast with ratio of potassium salt and sodium salt increasing. The basis weight had the most significant effect on smoldering rate of cigarette paper. There were various effect of combustion aids on smoldering rate, but the effect was not significant on the whole; when applying the method C, the smoldering rate of cigarette paper became slow with the basis weight increasing, and fast with combustion aids content and the ratio of potassium salt and sodium salt increasing. The basis weight had the most significant effect on smoldering rate of cigarette paper, and combustion aids and the ratio of potassium salt and sodium salt were the second. No matter which method was adopted, the air permeability had no effect on the smoldering rate of cigarette paper. Compared with method Y, method C was more significant for finding the ways to increase or decrease the smoldering rate of cigarette paper in production.

Cotton Potassium Hydroxide Cooking Process

薛润林 — 2015/8/13 14:53:54

A new pulping process of cotton linter with potassium hydroxide was introduced. The black liquor was neutralized and converted to be fertilizer containing nitrogen phosphorus potassium.

Effects of t Burning Additive in Cigarette Paper on the Cigarette Static Burning Speed

王启成 — 2015/10/19 9:49:06

Potassium citrate & sodium citrate were used in different dosages and proportion as burning additives to prepare cigarette paper samples, and cigarette samples were also be prepared accordingly in order to find out that effects of different dosage and proportion of the burning additives in cigarette paper on cigarette static burning speed. The result showed that: ① Higher amount of potassium citrate or sodium citrate increased cigarette static burning speed. ② Higher potassium citrate rate caused a faster cigarette static burning speed when the same amount of citrate burning additive was applied.

Study on the Influencing Factors of Thermal Conductivity of Micro-fiber Glass Wool Paper

2015/8/24 11:31:48

The influences of temperature, usage of porous filler and the dosage of filler on the thermal conductivity of micro-fiber glass wool paper were studied. The results showed that the thermal conductivity of BM-1 and BM-3 papers changed little between -10～20℃ as the temperature increased, when the temperature increased from -10℃ to 0℃,the thermal conductivity of the BM-2 paper increased from 0.0182 W/ (m·K) to 0.0287W / (m·K) with an increase of 57.7%, the change was very obvious; while the thermal conductivity of the papers BM-4, BM-5, BM-6 also increased by 30.4%, 40.6%, 32.4%. The thermal conductivity of micro fiber glass wool paper adding 200 to 400 mesh expanded perlite was smaller than that adding vermiculite, and the thermal conductivity of the paper was the minimum when the filler dosage was 30%.The filler particle size had little influence on the thermal conductivity of the paper.

Analysis Method of Fluorescent Whitening Agent in the Papers for Dining-table

陈春霞,赵　俭,邓健信,徐梅英,陈润权 — 2015/7/23 0:00:00

This paper mainly discussed the analysis method of fluorescent whitening agents in the papers for dining-table. Results of the experiment showed that kinds of paper for dining-table contained fluorescent whitening agents which could be migrated. Analysis methods of fluorescent whitening agents, such as ultraviolet-visible spectrophotometry and qualitative method achieved similar results. Further analysis formed that testing migration behavior of fluorescent whitening agents by using water, acetic acid and ethanol was more suitable compared with using simulated sweat.

The Application Study of NC-S Processing Technology in Screen Drum Treatment

赵黎 — 2015/7/31 0:00:00

Based on the screen drums working principle and years mills operation experiences the shortcoming of existing screen drum were analyzed, a kind of advanced screen drum surface treatment method NC-S processing technology which could enhance the wear resistance, corrosion resistance of the screen drum, improve service life, save money for the enterprise was recommended.

Comparison of Filling Performance of Wollastonite Filler Processed by Raymond Mill and Ball Mill

LIU Shi-liang — 2015/5/19 0:00:00

This paper discussed the filling performance of wollastonite filler processed by Raymond mill and ball mill.The difference of particle morphological characteristics of two kinds of wollastonite particle processed by Raymond mill and ball mill was studied. The results indicated that retention of the filler processed by Raymond mill was better, the buck and stiffness properties of the paper filled with the filler processed by Raymond mill were higher and the crystal cluster had better reservationin that filler.

Study on the Technology of Rice Straw Biochemical Mechanical Pulping

张志礼,吕文康,张福龙,庞志强*,李凤凤 — 2015/7/31 0:00:00

In this paper,the technology of Bio-CMP pulping of rice straw was explored. The study found that when the dosage of xylanase was 30 IU/g based on dry straw, the pulp could reach brightness of 27.8% and acceptable physical property of paper. Compared with sulfonation treatment at low temperature, better results could be acquired through NaOH treatment. The xylanase pretreatment before chemical treatment had significance of practical application, it was beneficial for the chemicals to penetrate into internal structure of the materials and improve the reaction efficiency between the chemicals and the lignin. When the dosages of xylanase, cellulase, and pectinase were 20 IU/g, 10 IU/g and 15 IU/g, respectively, the quality of fiber and physical property of paper were better and the burst index of paper was 1.18 kPa·m2/g, breaking length was 2.23 km, ring crush index was 2.27 N·m/g and the tear index was 4.49 mN·m2 /g.

Screening of Mixed Strains for Synergistic Degradation of Reed Lignin

卢庆华 — 2015/7/31 0:00:00

The mixed strains used for degradation of lignin in reed were screened. Penicillium common A, Penicillium chrysogenum B, bacteria C and Aspergillus fumigates D. were utilized as experimental strains. By using different combination of the four strains to degrade the lignin and the degradation rates of lignin were compared, so as to determine the optimum strain combination. Then different mixing methods of mixed strains, various mixing ratios and solidtoliquid ratios were optimized to obtain the optimal strains combination. The results showed that the ABD combination showed the best lignin degradation rate. The lignin content was 10.7% and the degradation rate was 67.3% when the mixing ratio of A∶B∶D was 1∶4∶16 and after eight days treatment.

Study on Reed MCC Preparation Process by Acid Hydrolysis

韩　颖,李凤萍,樊婷婷,周景辉,郭延柱 — 2015/7/31 15:22:32

The preparation conditions of microcrystalline cellulose (MCC) from reed pulp by using HCl as solvent were studied in this paper. By using orthogonal experiment method, study results showed that the optimal preparation conditions was HCl concentration 6%, hydrolysis time 60 min, temperature was 80℃, liquid ratio 1∶10. The temperature had larger impact on hydrolysis. Degree of polymerization (DP) of the product was 276.0 L/g, crystallinity was 73.2%, yield was 85.4%. The products were proved cellulose I (MCC) by infrared spectroscopy and X-ray spectroscopy characterization.

Application of a Blend of Rubber Latex-phenolic Resin to Strengthen Oil Filter Paper

2016/9/9 9:38:46

Phenolic resin used for strengthening oil filter paper was modified by blending with rubber latex in this study. Effects of the type and content of rubber latex on the comprehensive properties of the strengthened oil filter paper were studied. SEM and FT-IR were used to characterize the micro-morphology and chemical structure of the blend resin. The results showed that carboxylic butadiene-acrylonitrile latex was the most suitable latex for the blending system and the impregnated oil filter paper achieved the best comprehensive performances when the rubber latex content was 7.5% (on the content of phenotic resion). This was due to the reason that the carboxylic group of the rubber latex could react with the phenolic resin and increase the compatibility the blend system.

Fiber Morphology and KP Pulping of Two Paulownia Woods

2016/8/8 16:31:22

The fiber morphology, chemical composition and KP pulping performance of two kinds of Paulownia wood were studied.The results showed that the average fiber length of two kinds of Paulownia wood material was in 0.7～0.85 mm, fiber width was in 16.4～19.2 μm, fiber length-width ratio value was in 38～51 which belonged to short fiber raw material. These two Paulownia wood material contain higher cellulose(nitro-ethanol celluloses 43%～47%) and lower acid insoluble lignin(17%～23%). Like most hardwood material, the content of pentosan was in 22%～26% .These features made them easy to cooking, beating and receiving high pulping yield, while the slightly higher content of extractives would increase the consumption of chemicals in cooking process. The KP pulp strength properties of Paulownia wood were good, and the stem wood and branch wood of Paulownia had no significant difference in pulping performance, Paulownia wood was suitable material for pulp and papermaking.

Lignin Separation from Corn Stalk Using 1,4-Butanediol

王雪娇,杨桂花,陈嘉川 — 2016/7/28 15:09:14

Corn stalk, as the main agricultural residual in China, can be realized the fully utilization of its three main components by developing the lignin separation technology. High boiling solvent of 1,4-butanediol was selected as cooking solvent to separate lignin from corn stalk in this study. The optimal cooking conditions were: 1,4-butanediol 90% (mass fraction), cooking temperature 160℃, solid/liquid ratio 1∶10, time at maximum temperature 1.5 h, dosage of concentrated sulfuric acid 0.15 mL/g (on the oven dried raw material). The highest lignin extraction rate was 89.2%, corresponding to 18.2% on the oven dried raw material. Additionally, no significant change of the functional groups of lignin was verified by FT-IR, it provided the potential for downstream application.

Preparation of Lignin Based Heavy Metal Adsorbent by Lignin Aminating Modification

李　萌,王　振,翟　凡,付文晓 — 2016/6/13 14:33:06

In this experiment, Lignin based heavy mental adsorbent used for obsorbing Pb²⁺ solution was prepared by aminating modification using lignin as raw material. The purified lignin was modified by amber anhydride firstly, then reacted with triethylene tetramine using paratoluensulfonyl chloride as catalyst the aminatd lignin was prepared. The product was characterized by carboxyl group determination, Fourier Transform Infrared spectrum (FT-IR) and adsorption performance analysis.The results showed that when the molar ratio of amber anhydride and lignin was 1.5∶1, the reaction time was 1 h, the temperature was 28℃, pH value was 8.5～9.0, the carboxyl group content of the modified lignin was 1.98 mmol/g. FT-IR spectrum analysis showed that lignin modification was successful.The adsorption of Pb²⁺ was in accordance with the pseudo two order kinetic model and Freundlich model. The adsorption capacity of the product improved with the increase of pH, and the adsorption capacity decreased when pH value>5. When pH value was 5, the adsorption capacity reached 152.95 mg/g.

Effect of CPAM on Electromagnetic Shield Paper Made of Carbon Fiber-Nickel Powder

邹文俊,陆赵情,杨　洁 — 2016/4/18 13:28:35

In this paper the effect of CPAM on electromagnetic shield paper made of carbon fifer-nickel powder was studied by adding various dosage of CPAM to the furnish and comparing the strength property and conductivty of the paper, and the retention rate of nickel-powder.Experimental results showed that when the CPAM dosage was 0.4%, the properties of carbon fiber-nickel powder electromagnetic shield paper was the best.

Application of Lime Mud for Preparation of Ceramsites

2017/4/7 21:35:04

Lime mud is a kind of hazardous industrial solid wastes from the alkali recovery process. It is primarily composed of CaCO3 and classified as calcium-rich materials. The ceramsites manufacture technology using large dosage of lime mud and silicate minerals as raw materials was provided in this study. For the prepared ceramsites, the bulk density was in the range of 0.724～0.783 g/cm³; the apparent density was in the range of 1.085～1.218 g/cm³ and the apparent porosity was in the range of 49.49%～52.58%, in dicating its light weight and process property. The technology has high economic benefits and social benefits, which might be a comprehensive utilization technology of lime mud.

Preparation of Ag Doped TiO₂ Photocatalyst and Its Advanced Treatment for Paper Process Effluent

DONGFANG Hong — 2019/9/2 17:42:22

Ag doped TiO₂ photocatalyst was prepared by sol-gel method. The prepared samples were characterized by XRD, UV-vis, SEM and EDS. The crystallinity and band gap of synthesized TiO₂ decreased when the doping amount of Ag was increased. The photocatalyst was applied to treat washing and bleaching effluent in order to induce COD_Cr and chroma. This paper analyzed the effect degree on the consequence of different factors such as doping content of Ag, original pH value of washing and bleaching effluent, amount of photocatalyst and illumination time .The photocatalytic treatment test indicated that the photocatalytic degradation was optimum when the Ag doping amount was 3%, the pH value was 6 and the catalyst dosage was 0.6 g/L. The chroma and COD_Cr removal rate were 100% and 81.3% respectively after 12 hours radiation.

Study on the Effect of Micro-silica Mineral Powder Filling on Paper Properties

LIU Jianan,DONG Xiaobin,FAN Huiming,GAO Da,QI Yanan,CHEN Shisheng — 2019/8/9 13:32:48

Micro-silica mineral powder, calcium carbonate and talc powder were separately filled into the hardwood pulp, softwood pulp and deinked pulp to compare strength properties and printing properties of corresponding handsheets. The results showed that the effect of micro-silica mineral powder on strength properties of the paper was similar to that of talc powder and calcium carbonate. And strength properties of the paper using micro-silica mineral powder as filler were better when ash content was low. Due to the whiteness of micro-silica mineral powder, whiteness of filled paper decreased with the increase of micro-silicon mineral powder filler. Therefore, micro-silica mineral powder was suitable to be used as filler for the papers which do not require high whiteness.

Improving Hydrogen Peroxide Bleaching Efficiency of Bamboo Chemi-mechanical Pulp in Alcohol Aqueous Medium

2019/6/5 15:49:59

To improve hydrogen peroxide bleaching efficiency and break “brightness ceiling” of bamboo chemi-mechanical pulp（CMP）， tests of an improved hydrogen peroxide bleaching procedure for bamboo chemi-mechanical pulps were performed with inclusion of ethanol in the bleaching medium （IEBM）.Compared with a conventional bleaching method， the CMP was bleached to brightness of 69.2% when the dosage of H₂O₂ was 15%， with the IEBM method the CMP was bleached to the same brightness when the H₂O₂ dosage was 9%， bleaching with the IEBM method reduced H₂O₂ consumption by approximately 40%.At the usage level of 15% H₂O₂， the CMP could be bleached to the brightness of 77.4% with the IEBM method， increased by 8.2 percentage points compared with the conventional method.Further more， the bleached brightness differences between IEBM and conventional method increased dosage level of H₂O₂ increased， it could reach up to 10.3 percentage points, when the CMP was bleached to the brightness of 81.7% at the dosage of 25% H₂O₂ increased.UV-Vis spectrophotometry showed that， for the same brightness， bleached pulps with IEBM method had better bleaching stability than the bleached pulps of conventional method， the main reason was the improved destruction of chromatic structures of the α-carbonyl group conjugated with benzene ring and γ-aldehyde group connected with benzene ring that absorb light in the region of 370～385 nm， and also the improved destruction of quinoid structure that absorb light in the region of 400～500 nm.

Electro-Fenton Procress for Advanced Treatment of Papermaking Wastewater

CHEN Xuehua,XU Huidao — 2019/12/27 17:01:01

The electro-Fenton method was used for advanced treatment of papermaking wastewater．The paper investigated the effect of different factors on treatment result to determine the optimum conditions，the chroma and COD removal rate were chosen as the evaluation indexs．The result suggested that the optimum conditions were as the follows: reaction time 120 min, initial pH value 3, electrolysis voltage of 12 V, Fe²⁺ concentration 0.8 mmol /L, H₂O₂ concentration 0.8 mmol/L, plate space 10 cm, Na₂SO₄ dosage 6 g/L, the chroma and COD_Cr removal rate were 89.5% and 68.4% respectively under the conditions.Kinetic analysis showed that the papermaking wastewater degradation curve of COD_Cr consisted with the first-order reaction kinetic characteristics and the value of the kinetic constant was 0.2072 min^-1.

Study on the Properties of Restoration Paper Used in Suzhou Style Mounting

ZHANG Nuo,ZHENG Dongqing,HE Weijun,MIN Haixia — 2019/11/5 9:23:12

In order to choose the right restoration paper, six different Xuan papers were tested and evaluated. The evaluation indicators included physical properties, chemical properties and durability. The results showed that according to the weights of thickness, strength, whiteness and pH value, No.4^{Hongxing Jingpi mianlian paper was better than other paper samples in comprehensive performance. After aging, the tensile index , tear index and whiteness value decreased by 16.6% , 16.3% and 0.4% on average respectively, and the pH value increased by 2.3%.}

Determination of Moisture in Filter Plug Wrapping Paper by GC Method

KEN Shengye,DUAN Qin,YANG Xueyan,TIAN Feiyu YANG Yi, — 2020/9/28 9:41:25

In order to accurately determine the moisture in filter plug wrapping paper， a gas chromatography-thermal conductivity detector （GC-TCD） method was established by using acetone as internal standard and methanol as extraction solvent. The test results of the developed method were compared with those measured using national standard method. The results showed that the limit of quantitation，recoveries，relative standard deviations of the developed method was 0.12%， 96.42%~101.00%，1.93%， respectively. The result of GC-TCD method was about 70% as high as that of standard method. This method eliminated the errors caused by volatile components in filter plug wrapping paper in the determination of moisture， and offered more accurate and reliable results. The method was suitable for determining the moisture in filter plug wrapping paper.

Study on Preparation of 13X/SBA-15 Composite Molecular Zeolite and Its Performance in Treatment of Papermaking Wastewater

2020/8/4 18:57:39

In this study, 13X microporous molecular sieves and SBA-15 mesoporous molecular sieves were functionalized and modified, and then were prepared into a kind of composite molecular sieve by post synthesis method. The structure of the composite molecular sieve was characterized by various methods. Finally, the treatment effect of the wastewater from the middle stage of papermaking was evaluated. The physical characterization experiment showed that the synthesized composite molecular sieve had both microporous and mesoporous structures, with a specific surface area of 620.2 m²/g, a total pore volume of 1.15 cm³/g, and an average pore size of 6.18 nm. The wastewater treatment experiments showed that under the conditions of 60℃, molecular sieve dosage of 1.0 g/L, pH value of 7.8, and adsorption time of 60 mins, the removal rates of chroma, SS and COD_Cr in papermaking wastewater by composite molecular sieve were 98.8%, 85.7% and 81.4%, respectively. The regeneration test showed that the modified composite molecular sieve had good regeneration and adsorption performance and could be reused for many times.

Experimental Study on the Wettability of Watercolor Paper

ZHANG Chunrong — 2020/6/4 15:03:57

As a special paper for watercolor painting, watercolor paper has an important influence on the effect of watercolor painting. In this study, the watercolor paper was aged for 72 h in a incubator at 105℃, and the static contact angles of the watercolor pigment solution with pigment mass fraction of 0.02%, 0.04%, and 0.06% on the surface of the watercolor paper before and after aging were measured. Fourier transform infrared spectrometer, X-ray diffractometer, and scanning electron microscope were used to analyze the micro-morphology of the paper surface before and after aging. The results showed that the average contact angles of the watercolor paper before aging with 0 （distilled water）, 0.02%, 0.04%, and 0.06% watercolor pigment solutions were 117.607°, 120.086°, 122.864°, and 122.275°, respectively; the corresponding aged watercolor paper average contact angles were 115.737°, 119.045°, 114.279°, and 115.147° respectively. The wettability of the watercolor paper did not change significantly before and after the aging experiment, and it was hydrophobic. After aging, the contact angle of the watercolor paper with 0.04% and 0.06% watercolor pigment solutions changed greatly.

Effects of Microcapsules on Smoldering Rate and Burning Temperature of Cigarette Paper

XU Lanlan,WANG Jianmin,LIU Chaofu,LIU Zhe,SHEN Yan,LUO Haitao — 2020/6/4 15:04:00

In this Paper the effects of microcapsules and its dosages, including hollow microcapsule, jasmine flavor microcapsule and cranberry flavor microcapsule in cigarette paper on permeability, smoldering rate and maximum smoldering temperature of the paper were studied. The results showed that the air permeability of cigarette paper decreased gradually with the increase of the amount of hollow microcapsule and cranberry flavor microcapsule. The air permeability of cigarette paper was not affected by jasmine flavor microcapsule. When the dosage of microcapsule was 2.0%, compared with the control, the smoldering rates of cigarette paper adding hollow microcapsule increased by 9.4%, and the smoldering rates adding cigarette papers adding was almost the same. Besides the dosage, combustibility of microcapsule flavorcore also has an effect on the burning rate. When the dosage of microcapsule was more than 1.5%, the maximum smoldering temperature of cigarette paper increased with the dosage.

Experimental Study of Ultrafiltration Ceramic Membrane for Advanced Treatment ofPapermaking Wastewater

CHEN Li — 2020/11/30 9:32:19

Aiming at the current water quality characteristics and advanced treatment technology of papermaking wastewater, this paper proposed to carry out advanced research on papermaking wastewater treatment by using ultrafiltration ceramic membrane green energy-saving technology. The test results showed that the optimal working condition of ceramic membrane as followed: transmembrane pressure difference 0.2 MPa, film flow rate 1000 L / h. Under these conditions, the solid suspended matter (SS) removal rate of papermaking wastewater was greater than 94.5%, the removal rate of chemical oxygen demand (COD_Cr) was greater than 76.2%, and the removal rate of chroma was higher than 72.3%. The water quality met the requirements of "Water Pollutant Discharge Standard for Pulp and Paper Industry"(GB 3544—2008). The results of membrane cleaning and regeneration experiments showed that the ultrafiltration ceramic membrane flux could be restored higher than 90% after reverse cycle chemical cleaning.

Preparation of Business Card Base Paper from Ginseng Extract Residues and Wood Pulp

HAN Shujun,LU Jinshun,LIU Dan,SUN Huageng,LIU Ying,DAI Lin,SI Chuanling — 2020/2/12 18:35:27

In order to develop the value-added utilization of plant waste materials，the morphological structure，crystallinity and thermal stability of ginseng extract residues were investigated and the preparation of business card base paper using ginseng extract residues and wood pulp was studied. The results showed that the average length and width of ginseng extract residue fiber were 0.580 mm and 41.4 μm respectively， with similar fiber morphology to that of hardwood pulp. When mixing bleached eucalyptus pulp with less than 5% ginseng extract residues，the strength indexes of business card base paper，such as tensile index, ring pressure index, burst index and tear index of the hand-made tablets all meet the requirements of the qualified products in the industry standard of bleached kraft pulp (QB/T 1678—2017). It can be used for synergistic preparation characteristic business card base paper.

Study on the Classification of Thermosensitive Paper by XRF Combined with Multivariate Statistical Analysis

JIANG Hong,WANG Xin,GU Anzhou — 2020/12/24 16:20:52

In order to establish an analytical method for rapid detection of thermal paper， 31 samples of different brands and different series of the same brand were determined by X-ray fluorescence spectrometry （XRF）， and the experimental results were analyzed by principal component analysis and cluster analysis combined with multivariate statistics. According to the kinds and contents of elements in the samples， 31 samples of thermal paper could be effectively distinguished. When the merging distance was the smallest， the samples could be divided into 6 types. Discriminant analysis was performed at the sametime of verification， and the overall prediction accuracy rate was 95.7%.This method did not damage the inspection materials and had good reproducibility， which could provide help for the public security sector in handling cases.

Identification of Cigarette Paper Based on Smoldering Performance and Potassium Content

2020/12/24 16:20:54

The smoldering performance and potassium content of cigarette paper were studied in order to identify the cigarette paper from other kinds of similar paper. Experiment results showed that there were apparent difference in smoldering performance， smoldering distance and potassium content of cigarette paper and other similar thin papers. These two combustion characteristics and potassium content could be applied to the identification of cigarette paper.

A Preliminary Study on the Anti-aging Properties of Four Kinds of Tibetan Paper

ZAN Qinggong,LI Haichao,JI Qingsong,ZHANG Xingping,LIANG Tian,RENQING Zhuoma — 2020/11/24 15:44:38

This study analyzed the difference of anti-aging performance of four kinds of Tibetan paper， namely Tibetan Xuela Tibetan paper， Sichuan Dege Tibetan paper， Nangqian Gama Tibetan paper and Nangqian black Tibetan paper. The whiteness， folding endurance and tensile strength of the papers were measured before and after ultraviolet aging. The results showed that the properties of the four kinds of Tibetan paper before aging were quite different， however， the above properties showed a downward trend after aging. Tibetan Xuela Tibetan paper and Sichuan Dege Tibetan paper had good whiteness， folding endurance， retention rate of tensile strength and durability.

Preparation of Modified Paraffin Emulsion and Its Application on Paper Surface Sizing

SUN Lihua,LI Yonghong,LI Yanhong,ZHANG Wei,WANG Huiming — 2020/11/24 15:44:39

In this paper， oxidized polyethylene wax was used to physically modify No.58 paraffin， combined with emulsifier OP-10 to prepare a stable modified paraffin emulsion. The effect of formulation composition and emulsification process on the performance of the emulsion was discussed， and the sizing effeet of modified paraffin emulsion on the surface of paper was evaluated. The results showed that under the condition of emulsion solid content of 30%， in which emulsifier of 7%， m（No.58 paraffin）∶m（oxidized polyethylene wax）= 21∶2， stirring speed was 1000 r/min， emulsification temperature was 70℃ and emulsification time was 4 min， the solid content， particle size and stability of modified paraffin emulsion were significantly better than conventional paraffin emulsion. The sizing degree of the modified paraffin wax emulsion surface sizing paper was 1.5 mm， and the wetting angle decreased by 1.35° after sizing times of 180 s； compared with the unsized paper， the tensile index and burst index of sizing paper increased by 8.84% and 15.56%， respectively. It showed that modified paraffin wax emulsion was an excellent paper sizing agent.

Study on the Improvement Physical Properties of Textured Base Paper by PVA Reinforced Fiber

YAO Zhiwei,ZHANG Xiaolong,BAI Qiumei,CHU Shouxing,WANG Yang,YANG Rendang — 2021/8/30 9:35:46

In this paper， the effect of polyvinyl alcohol （PVA） reinforced fiber on the improvement of physical properties of textured base paper was studied. The results showed that the interlayer bonding strength and tensile strength of the textured base paper contented 1.5% PVA reinforced fiber were 337 J/m² and 7.35 kN/m， which were 40.4% and 53.1% higher than that of blank sample （without PVA reinforced fiber）. Meanwhile， there was no obvious negative effect on other physical properties of the textured base paper. In the comparative experiment， when the 1.5% enhancer 500 was added， the interlayer bonding strength and tensile strength of the textured base paper were increased by 12.2% and 6.5%， respectively， and the enhancement effect was not significant.

Study on Preparation and Properties of Ag/RGO/Cellulose Composite Paper

YANG Miao,DU Jinge — 2021/8/30 9:35:55

Ag/cellulose fibers and graphene oxide（GO）/cellulose fibers were uniformly mixed， and then Ag/RGO/cellulose composite paper were obtained by vacuum filtration process and hydrazine hydrate reduction. The structure and morphology of prepared Ag/RGO/cellulose composite paper were characterized by X-ray photoelectron spectrometer and scanning electron microscope. The electrical conductivity， mechanical strength， thermal stability and antimicrobial activity of composite paper were studied. The result indicated that Ag/cellulose fibers and RGO/cellulose fibers knited together tightly. The conductivity of Ag/RGO/cellulose composite paper was 0.042 S/cm， which was lower than that of Ag/cellulose paper. The Young's modulus and elongation at break of Ag/RGO/cellulose composite paper were 489 MPa and 4.5%， respectively， which were 12.9% and 7.1% higher than that of cellulose paper. The initial pyrolysis temperature in the second stage was 300℃， which was 40℃ higher than that of cellulose paper. Ag/RGO/cellulose composite paper had excellent antibacterial activity， and the diametres of zone of inhibition against Escherichia coli and Staphylococcus aureus were 14 mm and 9 mm， respectively.

Carbon Foam Cathode Electro-Fenton Process for Papermaking Wastewater Advanced Treatment

WEI Yahui,XIAO Hongtao — 2021/6/25 13:29:02

In this study， a carbon foam cathode material was prepared by sucrose foaming-carbonization process for electro-Fenton advanced treatment of papermaking wastewater. Electron scanning microscope （SEM） and X-ray photoelectron spectrometer （XPS） were used to characterize the surface morphology and chemical construction of carbon foam cathode. The influence of the type of cathode material， reaction time， initial pH value，Fe²⁺ dosage and current density on the treatment efficiency of papermaking wastewater was investigated with COD_Cr removal rate as the evaluation index. The results indicated that carbon foam was formed by stacking a large number of pore structures with oxygen-containing functional groups on the surface. The optimum reaction conditions of electro-Fenton method with carbon cathode was that reaction time was 180 min， initial pH value was 3，Fe²⁺ dosage was 0.5 mmol/L and current density was 200 mA/cm². The COD_Cr removal rate could reach 88.4% under the conditions， which was 1.3 times higher than conventional carbon felt cathode. The COD_Cr removal rate remained 85% for 10 circles with less than 5% reduction in efficiency， indicating that the electro-Fenton method with carbon foam had good stability in the advanced treatment of papermaking wastewater.

Influence of Different Pigments on the Properties of Lightweight Coated Paper

LI Dan,ZHOU Jintao,TAN Guixiang,YUE Mingju,YIN Hui — 2021/6/8 14:16:17

The basic performance indicators of three pigments （Brazilian kaolin CENTURY， American kaolin KAOFINE and Yueyang Huatai ground calcium carbonate C95） including particle size， brightness， pH value， moisture， and 325 sieve residues were tested. The influence of different pigments on the quality and performance of the lightweight coated paper were studied. The application effects of different pigments in lightweight coated paper were investigated. The results showed that light coated paper with mixture coating including 22.5% Brazilian kaolin CENTURY， 7.5% American kaolin KAOFINE and 70% Huatai ground calcium carbonate C95 had better performance of gloss， ink adsorption and surface strength. Thus， the mixture coating had excellent comprehensive performance towards light coated paper.

Advanced Oxidation Integrated Technology for Advanced Treatment of Papermaking Wastewater

SUN Yuexin,WANG Dongdong,YU Qiang — 2021/4/22 14:14:18

In this study， an advanced oxidation integrated technology of activated carbon adsorption+Fenton oxidation+ozone catalytic oxidation， applied to the treatment of papermaking wastewater was introduced. The results showed that the optimal treatment conditions were as follows： when the amount of activated carbon was 0.5 g/L and the adsorption time was 30 min， the COD_Cr removal rate could reach 60%； when the effluent was treated by Fenton oxidation process with addition amount of H₂O₂ was 0.25 g/L， n（Fe²⁺）：n（H₂O₂）=1：4， and reaction time was 1.0 h， the COD_Cr removal rate could reach up to 32%； when the Fenton effluent was further treated by ozone catalytic oxidation， ozone concentration was 10%， H₂O₂ dosage was 0.1 g/L， gas-liquid ratio was 2：1， and reaction time was 1.0 h， the COD removal effect was the best. This advanced oxidation integrated technology could reduce the COD_Cr of wastewater from 180 mg/L to 25 mg/L with a removal rate of 86.1%， reaching the surface water level of Ⅳ class， and the integrated operation cost was ¥8.9/t.

Preparation of N-doped TiO₂ Nanotube Array Membrane Catalyst and Its Application in Photocatalytic Treatment of Papermaking Wastewater

ZUO Huanhuan,CHEN Hailin — 2021/3/19 17:40:11

In this study， a N-doped TiO₂ nanotube array membrane catalyst was prepared by anodizing technology for photocatalytic treatment of organic matter in papermaking wastewater. Field emission scanning electron microscope （FESEM）， X-ray diffractometer （XRD） and ultraviolet-visible spectrophotometer （UV-Vis） were used to characterize the surface morphology and chemical composition of the sample. The results showed that the TiO₂ nanotube array membrane had a highly ordered morphology， and its pore size and nanotube length reached an optimal state when the anodizing voltage was 40 V. In addition， the crystal form of the TiO₂ catalyst was anatase， and as shown in the results of UV-Vis， it had a strong light absorption capacity with the absorption band edge had a significant red shift. When the prepared catalyst was used in photocatalytic papermaking wastewater， the removal rate of COD_Cr and chroma of the waste water reached 80.1% and 90.2%， respectively with the dosage of catalyst was 2.5 g/L and reaction time of 60 min.

Consideration on Design Optimization of Single-Layer Portal Steel Frame

ZHANG Rui — 2021/3/3 10:59:34

With the increasing improvement of people's living standards and the rapid development of the express delivery industry， the demand for paper and paper board is increasing， paper mills need to fast construct the warehouse for storage of the pulp sheet and finished paper product， steel structure of gabled frames just meet the requirements of this type of warehouse. Combining the development status of the current steel structure of gabled frames （hereinafter referred to as the " gabled frames "）， from the practical project of gabled frames design work experience. The problems should be paid attention in the frame structure of the main components of gabled frames design， design optimization of retaining structures were analyzed， in order to provide reference for the design and optimization of single-layer portal steel frame in the future.

Effect of Calcium Carbonate Forms on the Air Permeability and Ash Condensation Performance of Cigarette Paper

2021/11/5 17:55:17

The differences between elliptical， spherical， spindle and petal light calcium carbonate were compared in this study. The different forms of light calcium carbonate were applied to the production process of cigarette paper. The results showed that elliptical light calcium carbonate had the best ash condensation performance， spherical light calcium carbonate was the second， and petal light calcium carbonate was the worst. Spindle light calcium carbonate had the best air permeability， followed by petal light calcium carbonate， and elliptic light calcium carbonate was the worst. The retention rate of elliptical and spherical light calcium carbonate in cigarette paper was significantly higher than that of spindle and petal light calcium carbonate.

Simultaneous Determination of the Metal Ion Contents in Cigarette Paper by Using Ion Chromatography

2022/8/8 15:25:09

As a filler in the production of cigarette paper， calcium carbonate can improve the air permeability and adjust the burning rate of the cigarette paper， while the compounds of potassium， sodium and magnesium used as the combustion regulator in cigarette paper directly participate in the combustion， and the content of which will affect the release of smoke components from cigarette combustion， thereby affecting the sensory quality of cigarettes. Therefore， establishing a method for the determination of Na⁺， K⁺， Mg²⁺， and Ca²⁺ content in cigarette paper is of great significance for monitoring the quality of cigarettes. In this study， a method for simultaneously determining the contents of Na⁺， K⁺， Mg²⁺， and Ca²⁺ in cigarette paper was established by using ion chromatography. The results showed that a good linear relationship among the four metal ions was found with R²>0.9995，the detection limit 0.01~0.03 mg/g，the relative standard deviations <5%，and the recoveries of the ions 97.4%~106.2%.

Preparation and Properties of Low Crystallinity Cross-linked Network Waterborne Polyurethane

CHEN Hua,MA Yongsheng,SHAO Shuai,CUI Yingde — 2022/10/26 12:08:12

Taking Polybutylene glycol （PTMG） as the main raw material for the preparation of linear and cross-linked network waterborne polyurethane， the effect of the dosage of 2，2-dimethylolpropionic acid （DMPA） and trimethylolpropane （TMP） on physical properties of it was discussed in this study. The results showed that as the dosage of DMPA was increased from 2% to 10%， the particles of linear network waterborne polyurethane dispersion （LWPUD） became more uniform and regular， and the particle size of cross-linked network waterborne polyurethane dispersion （CWPUD） increased as the dosage of TMP was increased from 2% to 4%.

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One-step Process for AKD Neutral Sizing Emulsion Preparation

TCF Bleaching of AS-AQ Pulp of Corn Stalk Cuticle

Modification of Hydroxymethyl Lignin and the Effect the Product on Paper Strength

Preparation of Concrete Water-reducer by Oxidation and Sulfomethylation of Bamboo Pulping Black Liquor

Effect of Enzymatic Pretreatment on Beatability of Bleached Softwood Pulp

Effect of Cellulases Pre-treatment of Bleached Softwood Pulp on Beating Energy Consumption and Pulp Properties

Production of Bleached Kraft Pulp Using Moso Bamboo Leftover Material

Application of the Chelating Agent in White Mud Refining

A New Type of Disc Refiner Plate and Its Manufacture Method

The Effect of the Proportion of Poplar APMP on Physical Properties of Yellow Writing Paper

Determination of Total Alkali, Active Alkali and Effective Alkali in White Liquor by Potential Titration

Preparation of Light-weight Packaging Paper with CMP from Tobacco Stalk

Utilization of Chemical Additives in Hypochlorite Bleaching

Production of Bamboo-plastic Products from Bamboo Residus

Effect of Alkali and Xylanase Pre-treatment on Properties of Wheat Straw Pulp

Application of Guar Gum in Tissue Paper Manufacture

Study on the Paper Used for the Ancient Paper Cultural Relics Restoration

Application of Viscose Fibre in High Porous Filter Plug Wrapping Paper

Treatment of Southern Mixed Hardwood Chemical Pulping Effluent with Zero-valent Iron

Deacidification of Aged Paper by Using Natural Acid Stripping Agents

Factors Influencing Smoldering Rate of Cigarette Paper

Optimal Conditions of Lignin Precipitation from Straw Pulping Black Liquor by Using Phosphoric Acid

Application of the Cooking Penetrant in Poplar Chemical Pulping

Development and Application of High-performance Air Filter Paper for Gas Turbine Generator

Factors Influencing Smoldering Rate of Cigarette Paper

Application of Bio-enzymes in NS Pulping of Wheat Straw

A Design Scheme of 25t/d Black Liquor Gasification Combined with Paper Sheet Drying

Comparison of the Influencing Factors of Two Testing Methods for Smoldering Rate of Cigarette Paper

Cotton Potassium Hydroxide Cooking Process

Effects of t Burning Additive in Cigarette Paper on the Cigarette Static Burning Speed

Study on the Influencing Factors of Thermal Conductivity of Micro-fiber Glass Wool Paper

Analysis Method of Fluorescent Whitening Agent in the Papers for Dining-table

The Application Study of NC-S Processing Technology in Screen Drum Treatment

Comparison of Filling Performance of Wollastonite Filler Processed by Raymond Mill and Ball Mill

Study on the Technology of Rice Straw Biochemical Mechanical Pulping

Screening of Mixed Strains for Synergistic Degradation of Reed Lignin

Study on Reed MCC Preparation Process by Acid Hydrolysis

Application of a Blend of Rubber Latex-phenolic Resin to Strengthen Oil Filter Paper

Fiber Morphology and KP Pulping of Two Paulownia Woods

Lignin Separation from Corn Stalk Using 1,4-Butanediol

Preparation of Lignin Based Heavy Metal Adsorbent by Lignin Aminating Modification

Effect of CPAM on Electromagnetic Shield Paper Made of Carbon Fiber-Nickel Powder

Application of Lime Mud for Preparation of Ceramsites

Preparation of Ag Doped TiO2 Photocatalyst and Its Advanced Treatment for Paper Process Effluent

Study on the Effect of Micro-silica Mineral Powder Filling on Paper Properties

Improving Hydrogen Peroxide Bleaching Efficiency of Bamboo Chemi-mechanical Pulp in Alcohol Aqueous Medium

Electro-Fenton Procress for Advanced Treatment of Papermaking Wastewater

Study on the Properties of Restoration Paper Used in Suzhou Style Mounting

Determination of Moisture in Filter Plug Wrapping Paper by GC Method

Study on Preparation of 13X/SBA-15 Composite Molecular Zeolite and Its Performance in Treatment of Papermaking Wastewater

Experimental Study on the Wettability of Watercolor Paper

Effects of Microcapsules on Smoldering Rate and Burning Temperature of Cigarette Paper

Experimental Study of Ultrafiltration Ceramic Membrane for Advanced Treatment ofPapermaking Wastewater

Preparation of Business Card Base Paper from Ginseng Extract Residues and Wood Pulp

Study on the Classification of Thermosensitive Paper by XRF Combined with Multivariate Statistical Analysis

Identification of Cigarette Paper Based on Smoldering Performance and Potassium Content

A Preliminary Study on the Anti-aging Properties of Four Kinds of Tibetan Paper

Preparation of Modified Paraffin Emulsion and Its Application on Paper Surface Sizing

Study on the Improvement Physical Properties of Textured Base Paper by PVA Reinforced Fiber

Study on Preparation and Properties of Ag/RGO/Cellulose Composite Paper

Carbon Foam Cathode Electro-Fenton Process for Papermaking Wastewater Advanced Treatment

Influence of Different Pigments on the Properties of Lightweight Coated Paper

Advanced Oxidation Integrated Technology for Advanced Treatment of Papermaking Wastewater

Preparation of N-doped TiO2 Nanotube Array Membrane Catalyst and Its Application in Photocatalytic Treatment of Papermaking Wastewater

Consideration on Design Optimization of Single-Layer Portal Steel Frame

Effect of Calcium Carbonate Forms on the Air Permeability and Ash Condensation Performance of Cigarette Paper

Simultaneous Determination of the Metal Ion Contents in Cigarette Paper by Using Ion Chromatography

Preparation and Properties of Low Crystallinity Cross-linked Network Waterborne Polyurethane

Preparation of Ag Doped TiO₂ Photocatalyst and Its Advanced Treatment for Paper Process Effluent

Preparation of N-doped TiO₂ Nanotube Array Membrane Catalyst and Its Application in Photocatalytic Treatment of Papermaking Wastewater