阴离子自交联苯丙乳液的成膜抗水性能研究

Study on Water Resistance Perfomance of the Film Formed by Anionic Self-crosslinking Styrene-acrylate Copolymer

关键词:  苯丙乳液  涂膜吸水率  平均粒径  抗水性  成膜性

Key Words:styrene-acrylate  copolymer emulsion  film bibulous rate  mean grain size  water-resistance performance  film-forming performance

摘要:以苯乙烯（St）、甲基丙烯酸甲酯（MMA）为硬性单体，丙烯酸丁酯（BA）为软性单体，N-羟基甲基丙烯酸酰胺（N-MA）为自交联单体，以丙烯酸（AA）、α-甲基丙烯酸（MAA）作为功能单体，采用预乳化种子乳液聚合法合成了稳定的自交联苯丙乳液。考察了苯乙烯用量、乳化剂用量、自交联单体用量及功能单体用量对乳液涂膜吸水率的影响，结果发现，稳定自交联苯丙乳液的适宜合成条件为软硬单体质量比mBA∶(mSt+mMMA)为0.9~1.1，St用量在25%~27%，乳化剂用量为1.5%~2.5%，阴离子和非离子乳化剂配比为1∶1，N-MA用量为2.5%，AA和MAA用量均为0.5%，此条件下合成乳液的转化率达到95%以上，涂膜抗水性好，膜平滑、透明且无气泡，可见该自交联苯丙乳液有着较优异的稳定性、成膜性和涂膜抗水性。

Abstract:Using styrene (St) and methyl methacrylate (MMA) as the hard monomers, butyl acrylate(BA) as the soft monomer, N-hydroxyl methylacrylic acid amide(N-MA) as self-crosslinkable monomer, acrylic acid(AA) and α-methacylic acid(MAA) as functional monomers, stable self-crosslinking styrene-acrylate copolymer emulsion was prepared by the per-emulsified seeded emulsion polymerization method. The effect of dosages of styrene, emulsifier, self-crosslinkable monomer and functional monomers on the bibulous rate of the film formed by the emulsion was studied. The experiment results indicated that when the monomer mass ratio (BA)/(St+MMA) was 0.9~1.1, dosage of St was 25%~27%, dosage of emulsifier was 1.5%~2.5%, proportion of anion and nonionic emulsifier was 1∶1, dosage of N-MA was 2.5%, both dosages of AA and MAA were 0.5%, the conversion rate was over 95%, and the film was smooth, transparent and no bubbles.