水性室温自交联聚丙烯酸酯乳液的制备及性能

以双丙酮丙烯酰胺(DAAM)、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)和丙烯酸(AA)为共聚单体,采用预乳化和半连续种子乳液聚合工艺合成了水性室温自交联聚丙烯酸酯乳液(AACPA)。作为对比,合成了相应的常规聚丙烯酸酯乳液(CPA)。对两种乳液的粒径大小及分布、形态结构,两种乳胶膜的玻璃化转变温度(Tg)及力学性能等进行了系统的研究和对比。红外光谱(FT-IR)分析表明,室温下交联剂与功能单体双丙酮丙烯酰胺发生了交联反应;透射电镜(TEM)和动态激光光散射(DLS)表明,两种乳胶粒子均呈球状,但AACPA乳胶粒子的粒径更小,分布更窄。此外,相比于未交联的CPA膜,AACPA乳胶膜具有更高的Tg及更优异的力学性能。

Preparation and Properties of Aqueous Ambient Self-Crosslinkable Polyacrylate Emulsion

The water-based self-crosslinkable polyacrylate emulsion was synthesized by pre-emulsified and semi-continuous seeded emulsion polymerization with methyl methacrylate(MMA),butyl acrylate(BA),acrylic acid(AA) and diacetone acrylamide(DAAM) as monomers.As a comparison,conventional polyacrylate emulsion was prepared.The particle size and its distribution,morphology,glass transition temperature,mechanical property of the two kinds of latex films were investigated.The result of FT-IR showed that at room temperature crosslinking reaction of crosslinker and functional monomer diacetone acrylamide occurred.Transmission electron microscopy(TEM) and dynamic light scattering(DLS) indicated that two kinds of latex particles showed a sphericalthe morphology,but particle size of aqueous ambient self-crosslinkable polyacrylate(AACPA) emulsion became smaller and its particle size distribution(PSD) got narrower.Tg of AACPA latex film was higher than that of uncrosslinked conventional polyacrylate CPA latex film and AACPA latex film had better mechanical properties.