聚氨酯酰亚胺/有机硅改性环氧树脂涂料的耐热性能研究

Study on Heat Resistance of Polyurethane-imide/Silicone Modified Epoxy Coatings

制备了有机硅改性的环氧树脂,与环氧树脂配比使用,加入合成的端羧基聚(氨酯-酰亚胺)材料,利用固化剂多官能团氮丙啶CX-100低温固化形成聚氨酯-酰亚胺-有机硅改性环氧树脂(PUI/SiEP)复合材料。用透射电镜(TEM)、动态热机械分析(DMA)和热失重分析(TGA)考察了复合材料的微观结构与耐热性能。有机硅改性环氧树脂增强了涂膜的耐热性,含硅的比不含硅的复合材料5%和10%分解温度提高了30℃以上。复合材料中有机硅的质量百分数为15%和20%时各性能差异不大,但20%时出现了较为明显的相分离,所以最佳的有机硅添加量为15%。

Silicone modified epoxy resin,which has been prepared by the reaction of bisphenol A type epoxy resin（ DGEBA） and isocyanate terminated siloxane,was blended with epoxy resin,carboxyl poly（ urethane imide）material. Polyurethane imide-silicone modified epoxy resin（ PUI/EP/Si） composite materials were formed with the binding of CX-100. Transmission electron microscopy（ TEM）,dynamic thermal mechanical analysis（ DMA） and thermogravimetric analysis（ TGA） have been carried out to measure the composite materials. The results showed that with the increase of silicone content,heat resistance of the film were enhanced. The T5% and T10% of the PUI/Si-EP were above 30℃ higher than PUI/EP. The performance was indifferent when the content of siloxane in the composite mass percentage was 15% or 20%,but phase separation occurred when the siloxane concentration was 20%,so the best concentration was 15%.