环氧树脂／三羟甲基三聚氰胺硅化物固化体系阻燃性能与耐热性研究

摘要

Trimethylolmelamine-silicon （TMMSi） was prepared via the polycondensation reaction of tetraethoxysilane （TEOS） and trimethylolmelamine （TMM）, which was synthesized by melamine and formaldehyde. The cured epoxy resins containing TMMSi were prepared via in situ curing of the bisphenol-A type epoxy resin and 4, 4＇-diaminodiphenylmethane with TMMSi. Thermogravimetric analysis, differential scanning calorimetry, and limited oxygen index determination were carried out to characterize the cured products. It was found that the flame ratardancy of the cured epoxy resins with TMMSi was remarkablely improved, although thermal property was not improved obviously and the glass transition temperature changed less than those of the cured epoxy resins containing TMM. When the content of TMMSi was 15 phr, limited oxygen index was 29.6%, higher than that of neat epoxy resin by 40%.%利用三聚氰胺和甲醛合成了三羟甲基三聚氰胺（TMM），将其与正硅酸乙酯（TEOS）反应得到三羟甲基三聚氰胺硅化物（TMMSi）。将TMMSi与环氧树脂复合，采用4，4＇-二氨基二苯基甲烷（DDM）作为固化剂来制备环氧树脂／TMMSi固化物，并对固化物的热性能和阻燃性能进行了分析。结果表明，与环氧树脂／TMM固化物相比，环氧树脂／TMMSi固化物的玻璃化转变温度变化较小，高温耐热性提高不明显，但是阻燃性能得到了大幅度提高。当TMMSi含量为15份时，环氧树脂／TMMSi固化物的极限氧指数达到29．6％，比纯环