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Effect of Phosphate Esterification of Cotton Pulp on Its Beating Performance
  
DOI：10.11980/j.issn.0254-508X.2017.09.003
Key Words:cotton fiber  cellulose phosphate  esterification agent  microstructure
Fund Project:国家自然科学基金项目（31370578）。
Author NameAffiliation
钱　丽 陕西科技大学轻工科学与工程学院,陕西省造纸技术及特种纸品开发重点实验室,陕西科技大学轻化工程国家级实验教学示范中心,陕西西安,710021 
王　建 陕西科技大学轻工科学与工程学院,陕西省造纸技术及特种纸品开发重点实验室,陕西科技大学轻化工程国家级实验教学示范中心,陕西西安,710021 
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Abstract:Phosphate esterification of cotton pulp was carried out using Na2HPO4/NaH2PO4 as esterification agent. The optimum technology of cellulose phosphate esterification with half wet process was investigated by orthogonal experiments, and the DS of the product was analyzed by spectrophotometry. The optimum condition of cellulose phosphate esterification were as follows: the dosage of esterification agent 12%, reaction temperature 120℃, reaction time 1.5 h, pH 6.0, Na2HPO4/NaH2PO4 ratio 1∶1, dosage of urea 4%. Under this condition, the degree of substitution of cellulose phosphate was 0.032, the water retention value of the pulp increased from 92.86% to 134.12%; the surface of the cotton fiber after phosphate esterification had obvious local collapse and distortion, which were caused by the damage of the primary wall and outer layer of secondary wall of the fiber, which significantly improved the beating performance of cotton pulp．
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