水性聚氨酯/苯丙复合乳液的合成及其在表面施胶中的应用  

Preparation of hydrophilic polyurethane/styrene-acrylate emulsion and their application in surface sizing

作　　者：查瑞涛[1,2] 王东红[3] 蓝江华[2] 仇国贤 潘泉利[1] 

机构地区：[1]牡丹江恒丰纸业股份有限公司,黑龙江牡丹江157013 [2]天津科技大学材料科学与化学工程学院天津市制浆造纸重点实验室,天津300457 [3]中国石油兰州石化公司炼油厂,甘肃兰州730060 [4]中国石油兰州化工研究中心,甘肃兰州730060

出　　处：《合成橡胶工业》2009年第6期485-489,共5页China Synthetic Rubber Industry

基　　金：天津科技大学引进人才基金资助项目(20060437)

摘　　要：以N-甲基二乙醇胺（MDEA）为扩链剂制备了水性聚氨酯（PU）乳液，并用其与苯乙烯（St）、丙烯酸丁酯（BA）和丙烯酸羟乙酯混合单体制备了PU／苯丙（PUA）复合乳液，用傅里叶变换红外光谱表征了复合乳液的结构，考察了Pu及复合乳液性能的影响因素，并研究了复合乳液的表面施胶性能。结果表明，在-NCO／-OH（摩尔比）为1.7-1.9、MDEA质量分数为10％、中和度为100％的条件下，合成了平均粒径为75nm左右的水性PU；当反应温度为80℃时，PUA复合乳液呈乳白色且无凝胶产生；当BA：St（质量比）为1.5-2.0：1.0时，PUA复合乳液的抗水性较好；当BA质量分数由30％增加到40％时，PUA复合乳液的粒径增大，粒径分布变宽；在室温下用质量分数为0.2％的PUA复合乳液对原纸进行表面施胶时，纸张的施胶度达到33％；在105℃下，仅需很短的熟化时间下机纸张的施胶度可达95％。Hydrophilic polyurethane （PU） was synthesized with N-methyldiethanolamine （MDEA） as chain exdtender, and PU/styrene-acrylate （PUA） emulsion was prepared with styrene and butyl acrylate as monomers and PU as seed emulsifier. The structure of PUA emulsion was characterized by Fourier transform infrared spectroscopy. Effect factors on the properties of PU and PUA emulsions were investigated, and the performance of surface sizing of PUA was researched as well. The results showed that the average size of PU was 75 nm at-NCO/-OH（ mole ratio） from 1.7 to 1.9, mass fraction of MDEA of 10% and neutral degree of 100%. PUA emulsion was milky white and no gel produced at re-action temperature of 80℃. The PUA emulsion had good water resistance at BA/St （mass ratio） of （1.5-2.0）：1.0. The particle size of PUA emul-sionincreased and their distribution widened when mass fraction of BA increased from 30% to 40%. The sizing degree of base paper reached 33% at mass fraction of PUA of 0.2% and room temperature, and the sizing degree reached 95% after the paper was aged at 105℃ for a short time.

关 键 词：N-甲基二乙醇胺 水性聚氨酯 苯乙烯 丙烯酸丁酯 丙烯酸羟乙酯 苯丙乳液 表面施胶 

分 类 号：TQ330.6[化学工程—橡胶工业]