摘要： 为缩短丙烯酸氨基体系高温固化时成膜时间，采用溶液聚合将 N-异丙基丙烯酰胺（NIPAM）引入到聚合物链段中，制备具有温度响应性的水性含羟基聚丙烯酸酯二级分散体，并采用氨基树脂作为固化剂对分散体进行高温交联固化。结果表明：当温度高于较低临界溶解温度（LCST）时，聚合物链段的亲水性降低，疏水基团占主导地位，胶束结构坍塌，使聚合物从水中分离出来，达到快速失水的效果。固化剂氨基树脂的加入并不影响其 LCST，且当水性含羟基聚丙烯酸酯与氨基树脂 MR-4608的质量比为 8∶1，并在 140 ℃下固化 40 min时，涂层的凝胶率达到 85. 90%，铅笔硬度为 3H，附着力为 0级，耐水性达到 48 h不起泡不脱落，玻璃化转变温度（T_g）和热分解温度均得到提高。

关键词: 水性聚丙烯酸酯, 温度响应性, 临界溶解温度（LCST）, 氨基树脂, 分散体

Abstract: In order to shorten the curing time of acrylic amino coating，N-isopropylacrylamide（NIPAM）was introduced into the polymer chain via solution polymerization，a temperature-responsive waterborne polyacrylate secondary dispersion was prepared，then the dispersion was cured by amino resin. The results showed that when the temperature was higherthan the lower critical solution temperature（LCST），the hydrophilicity of polymer chainsegment decreased and the hydrophobic groups increased，resulting in the collapse of themicellar structure and the separation from water to achieve rapid water loss. The addition of curing agent amino resin did not affect its LCST. When the mass ratio of waterborne hydroxylpolyacrylate to amino resin MR-4608 was 8∶1，the film was cured at 140 ℃ for 40 min，the gel fraction of the film reached 85. 90%，the pencil hardness was 3H，the adhesion was 0 grade， the water resistance reached 48 h，and the glass transition temperature and thermal decomposition temperature were improved.

Key words: waterborne polyacrylate, temperature responsive, LCST, amino resin, dispersion

中图分类号: 

• TQ637.81