温度响应性聚丙烯酸酯分散体的制备及性能研究  

Preparation and Properties of Temperature Responsive Polyacrylate Resin Dispersion

作　　者：杨帅 宋雨方 钟炜锋 龚立昊 张学君 王梁彬 张洪吉 Yang Shuai;Song Yufang;Zhong Weifeng;Gong Lihao;Zhang Xuejun;Wang Liangbin;Zhang Hongji(School of Chemistry and Materials Engineering,Key Laboratory of Synthesis and Biological Colloid,Ministry of Education,Jiangnan University,Wuxi,Jiangsu 214122,China;Dena New Materials(Maoming)Co.,Ltd.,Maoming,Guangdong 525021,China;Maoming Green Chemical Research Institute,Maoming,Guangdong 525021,China)

机构地区：[1]江南大学化学与材料工程学院合成与生物胶体教育部重点实验室,江苏无锡214122 [2]德纳新材料(茂名)有限公司,广东茂名525021 [3]茂名绿色化工研究院,广东茂名525021

出　　处：《涂料工业》2024年第2期20-28,共9页Paint & Coatings Industry

基　　金：茂名绿色化工研究院“扬帆计划”项目(MMGCIRI-2022YFJH-J-002)。

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(Tg)和热分解温度均得到提高。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 higher than the lower critical solution temperature(LCST),the hydrophilicity of polymer chain segment decreased and the hydrophobic groups increased,resulting in the collapse of the micellar 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 hydroxyl polyacrylate 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.

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 

分 类 号：TQ637.81[化学工程—精细化工]