聚四氟乙烯、有机硅复合改性聚氨酯/环氧树脂共混聚合物的合成及其低表面能特性

Synthesis and Low Surface Energy Property of New Polyblends of Amino(polysiloxane)-polyurethane-epoxy and PTFE

以甲苯-2,4-二异氰酸酯(TDI)、聚醚二元醇为主要原料制得—NCO封端的预聚体,按一定比例和环氧树脂E-51混合均匀;另用氨乙基氨丙基甲基二甲氧基硅烷、八甲基环四硅氧烷(D4)合成一系列分子量不同的氨基聚硅氧烷,用多元胺作固化剂,并以聚四氟乙烯(PTFE)粉末为填料,合成一系列由PTFE、有机硅共同改性的聚氨酯/环氧树脂共混聚合物。测试了其力学性能、表面接触角、吸水率,同时进行了扫描电镜(SEM)以及表面电子能谱(ESCA)分析。结果表明:所制得的共混聚合物具有很低的表面能和良好的综合性能,PTFE和氨基聚硅氧烷对降低聚氨酯/环氧体系的表面能具有明显的复合效应。

A novel polyurethane performed polymer （TDI） and polydihydroxy alcohol in certain proportion was synthesized by toluene-2, 4-isocyanate which ensure the resultants were ended with -NCO group. The-NCO terminated polymer was then mixed with epoxy（E-51） in certain proportion as one kind of raw material（PPU-EP）, and the other kind of raw material, amino-polysiloxane（AEAPS）, was synthesized by aminopolysioxane and octamethylcylo-tetrasiloxane. Finally, a series of new polymer blends, which composed of AEAPS, PPU-EP and PTFE powder in different proportion were prepared. The properties of the blends were investigated, such as mechanical property, surface water contact angle. The results show that the polymer blends have good mechanical property and low surface tension property. It is also concluded that, under advisable conditions, introducing PTFE and AEAPS simultaneously in PPU-EP blend can reduce the surface energy of the blends.