水乳型自消光丙烯酸酯共聚物涂层的制备  

Preparation of self-matting waterborne acrylate copolymer coatings

作　　者：王娟[1] 马鑫磊 夏宇正[1] 陈晓农[1] 石淑先[1] WANG Juan;MA Xinlei;XIA Yuzheng;CHEN Xiaonong;SHI Shuxian(Beijing Engineering Research Center for the Synthesis and Application of Waterborne Polymers,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学北京市水性聚合物合成与应用工程技术研究中心,北京100029

出　　处：《精细化工》2024年第8期1848-1856,共9页Fine Chemicals

摘　　要：以苯乙烯(St)、丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)为主单体,选择同时带长亲水链段和长疏水链段的二十二烷基醇聚氧乙烯醚-25甲基丙烯酸酯(BEM)为功能单体,连同BEM混合液中含有的甲基丙烯酸(MAA)通过乳液共聚制备了丙烯酸酯共聚物乳液,并以此乳液制备了涂层。在BEM用量为15.0%(以3种主单体St、BA和MMA总质量为基准,下同)的条件下,考察了3种乳化剂复配比例、缓冲剂(Na HCO_(3))加入方式对聚合稳定性、单体转化率的影响;在固定乳化剂复配比例、Na HCO_(3)全部随引发剂溶液同时加入的条件下,考察了BEM用量(0、5.0%、10.0%、15.0%、20.0%)对涂层光泽度和透光率的影响。采用FTIR、SEM、AFM表征了涂层的结构组成和表面形貌。结果表明,利用乳化剂与功能单体BEM长烷基链之间的疏水相互作用,通过复配乳化剂及随引发剂共同滴加缓冲剂Na HCO_(3)的方式,可提高聚合稳定性(絮凝率为0.38%)和单体转化率(≥98%)。利用长链烷基自迁移构建粗糙表面可提高涂层自消光性能,在BEM用量为20.0%时可保持高透光率(≥89%)和低光泽度(35.4%),实现了涂层消光性能和透光性能的统一。Self-matting coatings were obtained from acrylate copolymer latexes,which were prepared through emulsion polymerization using styrene(St),butyl methacrylate(BA)and methyl methacrylate(MMA)as main monomers,beheneth-25 methacrylate(BEM)with large hydrophilic and hydrophobic groups simultaneously as functional monomer,and methacrylic acid(MAA)introduced by BEM mixture.With the BEM dosage kept at 15.0%(based on the total mass of main monomers of St,BA and MMA),the effects of emulsifier type and dosage,as well as the buffer addition method on the polymerization stability and the monomer conversion were further studied,while the influence of the BEM dosage(0,5.0%,10.0%,15.0%,20.0%)on the glossiness and transmittance of coatings were also investigated with the ratio of emulsifiers kept constant and the NaHCO_(3) buffer all added with the initiator solution.In addition,the composition and morphology of coatings were characterized by FTIR,SEM and AFM.The results showed that by using a comprehensive emulsifier system to form hydrophobic interaction between emulsifiers and BEM,and adding the buffer and initiator simultaneously,the stability of polymerization and the monomer conversion were improved with the coagulation lower than 0.38%and the monomer conversion higher than 98%.The enhanced self-matting performance of coatings could be attributed to the construction of micro-rough surface induced by the self-migration of large alkyl groups from the inner matrix to the coating surface.When the amount of BEM was 20.0%,the coating exhibited high transmittance(≥89%)and low glossiness(35.4%),indicating the achievement of balance between the matting performance and the transparency.

关 键 词：自消光 二十二烷基醇聚氧乙烯醚-25甲基丙烯酸酯 乳液聚合 光泽度 透光率 丙烯酸系列化学品 

分 类 号：TQ637[化学工程—精细化工]