丙烯酸酯软硬单体含量对PU/PA复合乳液及其表面施胶性能的影响

Effect of hard and soft monomers contents on acrylate on synthesis and surface sizing performance of polyurethane-acrylate emulsion

采用原位无皂乳液聚合法制备了水性聚氨酯-丙烯酸酯(WPUA)复合乳液。分析了软硬单体比例对WPUA乳液粒径、粘度,对胶膜的凝胶率、吸水率和力学性能的影响,并研究了WPUA乳液对纸张的增强作用。研究表明,随着m(MMA)增大,胶粒粒径增大,乳液粘度下降,胶膜凝胶率上升,吸水率先下降后上升,且当m(MMA)为14.37%时,胶膜力学性能最佳。以质量分数为1%的WPUA乳液进行表面施胶,施胶度达37.47s,湿强度达31.61%。当m(MMA)为8.64%时,耐折度达54次。

The waterborne polyurethane-acrylate emulsion was prepared by in-situ surfactant-free polymerization. The effect of soft and hard monomers ratio on the particle size,viscosity,and gel content,water absorption, mechanical properties of films were studied.Also the impact of WPUA on paper enhancement.The result shows that the average particle size increased with the increase of （MMA）,while the viscosity decreases.And for WPUA films,gel rate increased with the increase of （MMA）,and water absorption decreased first and then increased.WPUA film owns excellent mechanical properties when （MMA）=14.37%;with 1% WPUA emul-sion addition,the paper sizing value reach 37.47 s,wet strength reach 31.61%.Folding endurance reach 54 times when （MMA）=8.64%.