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Improving the Strength Properties of Liner Board by Cellulose Nanocrystal
Received:August 01, 2020  
DOI：10.11980/j.issn.0254-508X.2020.12.003
Key Words:recycled pulp  cellulose nanocrystal  cationic starch  cationic polyacrylamide  strengthening agent  strength properties
Fund Project:国家自然科学基金(31670584,31971602)；山东省省属高校优秀青年人才联合基金(ZR2018JL015)；山东省高等学校青创科技计划创新团队(2019KJC014)。
Author NameAffiliationPostcode
WANG Yingchao State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper of Science and Technology of Education Ministry，Qilu University of Technology （Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
HE Huili State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper of Science and Technology of Education Ministry，Qilu University of Technology （Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
WANG Qiang State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper of Science and Technology of Education Ministry，Qilu University of Technology （Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
LIU Shanshan State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper of Science and Technology of Education Ministry，Qilu University of Technology （Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
MU Yongsheng Jiangsu Jinke Total Solutions Co.， Ltd.， Nanjing， Jiangsu Province， 211200 211200
HAN Chenxiao Shandong Century Sunshine Paper Group Co.， Ltd.， Weifang， Shandong Province， 262499 262499
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Abstract:In this study， cellulose nanocrystal （CNC） was prepared by sulfuric acid hydrolysis from recycled pulp and applied to enhance the liner board. The results showed that the prepared CNC displayed a typical rod-like structure with a diameter and length of about 11~23 nm and 115~240 nm， respectively， the aspect ratio was 5∶1 to 22∶1 and Zeta potential was -56.37 mV. The aggregation state of CNC presented cellulose I structure with the crystallinity of 71.1%， and its thermal stability was slightly lower than that of recycled pulp. In the reinforcement experiment with 3% CNC dosage， tensile index， tearing index， burst index， ring crush index and folding endurance of liner board were 30.5 N·m/g， 6.22 mN·m2/g， 1.55 kPa·m2/g， 9.18 N·m/g and 3 times， respectively. Then， 2% cationic starch （CS） and 2% cationic polyacrylamide （CPAM） were combined with 3% CNC respectively to form the binary reinforcement systems， tensile index， tearing index， burst index， ring crush index and folding endurance of liner board were further increased by 30.5%， 4.1%， 12.7%， 11.6%， 33.3% and 21.9%， 3.5%， 12.3%， 10.6%， 33.3% compared to those of 3% CNC dosage respectively.
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