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The Modification of Phosphor-Gypsum Whisker and Its Application in Papermaking
  
DOI:10.11980/j.issn.0254-508X.2018.06.006
Key Words:phosphor-gypsum whisker  solubility  modification  physical properties  retention rate
Fund Project:四川理工学院大学生创新创业训练计划项目(CX2016041);四川省教育厅重大培育项目(17CZ0023)。
Author NameAffiliation
PANG Chun-xia* College of Bioengineering Sichuan University of Science and Engineering Zigong Sichuan Province 643000 
LIU Chun College of Bioengineering Sichuan University of Science and Engineering Zigong Sichuan Province 643000 
DING Chun-yue College of Bioengineering Sichuan University of Science and Engineering Zigong Sichuan Province 643000 
YANG Ling College of Bioengineering Sichuan University of Science and Engineering Zigong Sichuan Province 643000 
LI Rong College of Bioengineering Sichuan University of Science and Engineering Zigong Sichuan Province 643000 
FAN Ting College of Bioengineering Sichuan University of Science and Engineering Zigong Sichuan Province 643000 
CHEN Jian College of Bioengineering Sichuan University of Science and Engineering Zigong Sichuan Province 643000 
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Abstract:The dissolution-inhibiting modification of phosphor-gypsum whiskers and its application in papermaking were studied based on the structural properties and characteristics of the whiskers. Magnesium chloride and phosphors acid were used as the modifiers. The change of the solubility before and after modification, retention of whiskers and influence of whiskers on the physical properties of paper were studied. The Experimental results showed that the solubility of modified whiskers reduced because the surface of whiskers forned a coverage layer. The optimum conditions for the modification were as follows: the dosage of magnesium chloride was 30%, the ratio of magnesium chloride and phosphoric acid was 1∶1(mol/mol), the modification time was 20 min, the modification temperature was 60℃ and the pH value of phosphate solution was 9.0. The solubility of the modified whiskers reduced from 0.25 g per 100 g water to 0.03 g per 100 g water. The handsheets using the modified phosphorus gypsum whiskers as fillers obtained higher whiteness and opacity, lower physical strength and higher retention of whisker. The whiteness and opacity of the handsheets were increased 4.2% and 4.5%, respectively, the tear index, tensile index and burst index reduced 2.4%, 38.0% and 27.0%, respectively, and the retention offiller( whisker) increased from 24.5% to 77.8% under the optimum conditions.
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