阳离子水性聚氨酯涂层的制备与性能研究  

Preparation and properties of cationic waterborne polyurethane coating

作　　者：邝冠昆 刘岩[1] 徐丽丽 周园园 秦莹 雪蒙[1] 辛斌杰[2] Kuang Guankun;Liu Yan;Xu Lili;Zhou Yuanyuan;Qin Ying;Xue Meng;Xin Binjie(School of Chemistry and Chemical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;School of Textiles and Fashion,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学化学化工学院,上海201620 [2]上海工程技术大学纺织服装学院,上海201620

出　　处：《中国胶粘剂》2022年第9期31-35,共5页China Adhesives

摘　　要：以聚己内酯二醇(PCL)、异佛尔酮二异氰酸酯(IPDI)、二甘醇(DEG)、丙烯酸-2-羟乙酯(HEA)、N-甲基二乙醇胺(MDEA)为主要原料,合成了应用于马口铁的阳离子水性聚氨酯(CWPU)涂层。探究了不同异氰酸根指数(R值)、MDEA与PCL物质的量之比改变对CWPU涂层性能的影响。通过热重分析(TG)、吸水率、差示扫描量热分析(DSC)、硬度以及耐水性能等对CWPU涂层进行表征,探究了软硬段比例变化和亲水基团含量不同对涂层性能的影响。研究结果表明:MDEA与PCL的物质的量之比不变的情况下,R值为1.8时,CWPU涂层的吸水率最低,综合性能相对较佳;固定R值不变为1.8,随着MDEA与PCL的物质的量之比的增大,CWPU乳液的储存稳定性整体良好,CWPU涂层的硬度逐渐增大,耐水性和热分解温度均呈现先上升后减小的趋势,粒径呈现先下降后增大的趋势;当R值为1.8、n(MDEA)∶n(PCL)为3.47∶1时,CWPU涂层的综合性能较好。Cationic waterborne polyurethane(CWPU)coating applied to tinplate was synthesized by using polycaprolactone diol(PCL),isophorone diisocyanate(IPDI),diethylene glycol(DEG),2-hydroxyethyl acrylate(HEA)and N-methyl diethanolamine(MDEA)as main raw materials.The effects of different isocyanate index(R value)and the mass ratio of MDEA to PCL on the properties of CWPU coating were investigated.The CWPU coating was characterized by thermogravimetric analysis(TG),water absorption,differential scanning calorimetry(DSC),hardness and water resistance,and the effects of the ratio of soft and hard segments and the content of hydrophilic groups on the coating properties were explored.The research results showed that when the mass ratio of MDEA to PCL was constant and the R value was 1.8,the water absorption of CWPU coating was the lowest and the comprehensive performance was relatively good.Fixing the R value to 1.8,with the increase of the mass ratio of MDEA to PCL,the storage stability of CWPU emulsion was generally good,the hardness of CWPU coating increased gradually,the water resistance and thermal decomposition temperature both showed a trend of increasing first and then decreasing,and the particle size showed a trend of first decreasing and then increasing.When the R value was 1.8 and n(MDEA)∶n(PCL)was 3.47∶1,the comprehensive performance of CWPU coating was excellent.

关 键 词：阳离子水性聚氨酯 R值 n(MDEA)∶n(PCL)比值 马口铁涂层 性能表征 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]