氟硅丙烯酸酯共聚物乳液的制备

Preparation of Acrylate Copolymer Containing Fluorine and Silicon Latex

以十二烷基苯磺酸(DBSA)为催化剂,将甲基丙烯酸甲酯(MMA)、丙烯酸正丁酯(BA)、三(甲基三氟丙基)环三硅氧烷(D3F)与乙烯基三乙氧基硅烷(VTES)进行乳液共聚反应,制备了氟硅丙烯酸酯聚合物乳液。考察了不同单体及催化剂用量对乳液聚合的影响。结果表明:当氟硅单体D3F用量为20%,VTES用量为3%,DBSA用量为0.7%时,聚合过程及乳液的稳定性较好,乳胶的粒径大小在88nm左右;经氟硅改性的丙烯酸酯乳胶膜的热稳定性要高于聚丙烯酸酯乳胶膜,热分解温度提高了30℃;氟硅单体用量为5%时,乳胶膜的吸水率明显下降。

In this paper, acrylate copolymer latexes containing fluorine and silicon were prepared via semi continuous emulsion copolymerization in the presence of dodecyl-benzenesulfonic acid （DBSA）. The effects of the contents of catalyst and monomers on the stability of emulsion were systemically investigated. FTIR, TEM and TGA were used to analyze the properties of the latexes and films. The results indicated that when the amount of D3F was 20% , DBSA was 0. 7%, VTES was 3% , the final product was much more stable. The average particle size of the latexes was about 88 nm with a narrow distribution. The thermal stability of the film was improved and the water absorption rate was declined by the addition of fluorosilicone monomer.