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

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。

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 ct-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 e- mulsion 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.