摘要： 以甲基巯丙基二甲氧基硅烷（硅烷偶联剂 KBM802）为桥梁，D₃F（三氟丙基甲基环三硅氧烷）、D₄（八甲基环四硅氧烷）、D₄^Vi（四乙烯基－四甲基环四硅氧烷）在酸性条件下调聚成有机氟－硅低聚体，再用有机氟－硅低聚体和 KBM802 对丙烯酸酯进行改性，乳液聚合法合成了耐水性、耐候性、耐污性优良的氟硅改性丙烯酸酯乳液。 采用 TG、DSC、红外光谱和 X 射线衍射分析对乳胶膜进行测试表明，丙烯酸酯单体和有机硅氟氧烷发生了自由基乳液聚合。 当 D₃F 的加入量为 35%时，氟硅改性后的丙烯酸酯乳胶膜比纯丙乳胶膜的分解温度提高了69.5 ℃ 。KBM802的加入增加了乳胶膜的硬度、耐水性、耐候性和抗紫外线能力。

关键词: 甲基巯丙基二甲氧基硅烷, 三氟丙基甲基环三硅氧烷, 乳液聚合, 丙烯酸酯

Abstract: An organic fluorine-silicon oligomer was prepared by using methyl sulfhydryl propyl dimethoxy silane(silane coupling agent KBM802 as molecular bridge, D₃ F (1, 3, 5-tris[(3, 3, 3-trifluoropropyl ) methyl cyclotrisiloxan|, D₄(octamethylcyclotetrasiloxane )and DX( tetravinyl tetramethylcyelo tetrasiloxane ) telomeric as raw materials under acid condition.An acrylate was modified with KBM802 and the resulted oligomer to give a fluorine-silicone modified acrylate emulsion with better water resistance, weatherability and antifouling property. The latex film was characterized by TG, DSC, FT-IR and x-ray diffraction, indicating that a radical emulsion polymerization occurred between acrylate monomer and fluorine-containing siloxane. When the dosage of D₃ F was 3.5%, the decomposition temperature of the modified latex film was increased by 69.5 ℃ over that of the pure acrylic latex film. Further-ore, KMB802 could provide the modified latex film with higher hardness, better water resistance, weatherability and UV resistance.

Key words: methyl sulfhydryl propyl dimethoxy silane, 1, 3, 5-tris[(3, 3, 3-trifluoropropyl)methyl ]cyclotrisiloxane, emulsion polymerization, acrylate