| 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． |
