自交联型水性聚丙烯酸酯分散体的制备及其性能

以甲基丙烯酸甲酯（MMA）为硬单体、丙烯酸丁酯（BA）为软单体、丙烯酸（AA）为功能单体、甲基丙烯酸乙酰乙酰氧基乙酯（AAEM）为交联单体、过氧化苯甲酸叔丁酯为引发剂、乙二醇丁醚为溶剂，通过自由基溶液聚合经转相方式制备了自交联型丙烯酸酯分散体，该分散体在烘烤条件下不需要外加交联剂即可发生自交联反应。研究了丙烯酸、甲基丙烯酸乙酰乙酰氧基乙酯和固化时间等因素对树脂分散体和涂膜性能的影响。结果表明，优化的配方为：AA质量占单体总质量的3.5%、AAEM质量占单体总质量的5.0%、固化温度为180 ℃、固化时间为1.0 h。红外光谱和凝胶渗透色谱分析表明，AAEM成功接到了丙烯酸树脂分子链上；扫描电镜和粒度分析仪分析表明，乳胶粒呈球形且分布均匀；差示扫描量热分析表明，合成后的树脂分散体在高温下烘烤一段时间后，涂膜的玻璃化转变温度明显提高。

Preparation and Property of Self-Crosslinkable Water-Based Polyacrylic Dispersion

By using methyl methacrylate (MMA) as the harder monomer, butyl acrylate (BA) as the softer monomer, acrylic acid (AA) as the functional monomer, acetoacetoxyethyl methacrylate (AAEM) as the crosslinking monomer, tert⁃butyl peroxybenzoate as the initiator, propylene glycol butyl ether as the solvent for prepared self⁃crosslinking acrylate emulsion by free radical solution polymerization and phase inversion, and the emulsion could be self⁃crosslinked after baking at high temperature without additional crosslinking agent. This article mainly studied the influence of acrylic acid, acetoacetoxyethyl methacrylate and curing time on the performance of the polyacrylic resin dispersion and the film property. The results show that the optimized formula is as follows: The dosage of AA and AAEM are 3.5% and 5.0% of the total monomer mass, respectively, and the baking time is 1.0 h at a curing temperature of 180 ℃. FT⁃IR and GPC analysis showed that AAEM was successfully attached to the molecular chain of acrylic resin; SEM and particle size analyzer analysis showed that the TG of the film is latex particles were spherical and uniformly distributed; DSC analysis showed that after the synthesized resin dispersion is significantly increased after the synthesized resin dispersion is baked at high temperature for a period of time.