阳离子自交联苯丙聚合物及其改性ASA乳液的制备与性能研究

Preparation and Properties of Cationic Self-crosslinking Styrene-acrylate Polymer and Its Modified ASA Emulsion

关键词:  阳离子自交联苯丙聚合物  改性ASA施胶剂  分散性  稳定性  中性施胶

Key Words:cationic self-crosslinking styrene-acrylate coplymer  modified ASA sizing agent  dispersion  stability  neutral sizing

摘要:本研究选用甲基丙烯酰氧乙基三甲基氯化铵（DMC）、丙烯酰胺（AM）、苯乙烯（St）、丙烯酸丁酯（BA）、N-羟甲基丙烯酰胺（NMA）为共聚单体，经水溶液共聚方式制得阳离子自交联苯丙聚合物，并对其乳化ASA的实验条件进行了探究。结果表明，功能型单体的最佳用量为（相对于共聚单体）DMC 9.5%、NMA 2%，ASA与阳离子自交联苯丙聚合物最佳质量比为4.5∶1，改性后的ASA乳液具有优良的分散性和稳定性；用阳离子淀粉、矾土为双元助留剂，在浆料pH值为6.5，改性ASA乳液用量（相对于阔叶木浆）为0.15%，抄造的纸张施胶度达92 s；与原纸相比，施胶纸张耐折度、撕裂指数、抗张指数、环压指数分别提高41.2%、38.3%、45.6%、58.7%；碳酸钙填料为15%~20%，具有良好的施胶效果，适用于中性施胶。

Abstract:In this study， cationic self-crosscrossling phenyl-acrylic polymer （ASA） was prepared by aqueous solution copolymerization using 2- methacryloxyethyl trimethyl ammonium chloride （DMC）， acrylamide （AM）， styrene （St）， butyl acrylate （BA）， and N-hydroxymethyl acrylamide （NMA） as copolymers. The results showed that the dosage of functional monomer were 9.5% DMC， 2% NMA， and the optimal mass ratio of ASA to cationic self-crossbiphenyl propylene polymer was 4.5∶1. The modified ASA scaler had excellent dispersibility and stability. Using cationic starch and bauxite as dual retention agents， the pH value of the slurry was 6.5， the amount of modified ASA emulsion （relative to hardwood pulp） was 0.15%， and the sizing degree of the paper was 92 s. Compared with base paper， the folding resistance， tearing index， tensile index and ring pressure index were increased by 41.2%， 38.3%， 45.6% and 58.7%， respectively. When the dosage of calcium carbonale was 15%~20%， the modified ASA emuslion had a good sizing effect and was suitable for neutral sizing.