半本体法合成醇溶性聚丙烯酸酯的正交试验研究

摘要

An alcohol-soluble polyacrylate was synthesized using alcohol as solvent by semi-bulk polymerization with methyl methacrylate (MMA), butyl acrylate (BA), and 2-hydroxyethyl acrylate (HEA) as monomers, and benzoyl peroxide (BPO) as initiator. The optimal polymerization conditions were studied by orthogonal test with initiator concentration, HEA dosage, mass ratio of BA to MMA, feeding method, and solvent amount as factors. The results indicated that the polyacrylate coating prepared with 2.2% initiator, 2.5% HEA, and equal weight of solvent to total monomers at BA-to-MMA mass ratio of 4 : 5 by semi-bulk polymerization has a tough-dry time 10 min, through-dry time 40 min, water dropping resistance up to 20 d, water immersion resistance 7 d, and saline resistance 4 d, showing good comprehensive corrosion resistance.%以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、丙烯酸羟乙酯(HEA)为共聚单体,以过氧化二苯甲酰(BPO)为引发剂,在乙醇溶剂中用半本体的方法合成了醇溶性聚丙烯酸酯.通过正交试验探索了最佳的聚合务件,包括引发剂浓度、丙烯酸羟乙酯用量、软硬单体配比、加料方式和溶剂用量.研究结果表明,当引发剂浓度为2.2％,HEA用量为2.5％,m(BA)∶m(MMA)=4∶5,溶剂用量与单体总量的比为1∶1时,以半本体方式共聚获得的聚丙烯酸酯涂料的表干时间为10 min,实干时间40 min,耐滴水达到20 d,耐水性7d,耐盐水4d,制得的涂料综合防腐性能最佳.