云母/硅橡胶复合材料的硫化特性研究

Study on the Curing Characteristics of Silk Mica/Silicon Rubber Composite

研究了云母粉用量、乙烯基三乙氧基硅烷(A-151)用量以及硫化温度对云母/硅橡胶复合材料硫化特性和力学性能的影响。结果表明,云母粉用量在40份以下时对硅橡胶力学性能的影响不大,超过100份时会使硅橡胶的力学性能显著降低;加入云母粉会延迟硅橡胶的硫化反应,缩短硅橡胶的焦烧时间。A-151的加入虽然延迟了硅橡胶的硫化反应,但对硅橡胶硫化程度的影响并不大;而且少量的A-151有利于提高硅橡胶的力学性能,当加入2份A-151时,硅橡胶的拉伸强度可提高20%,撕裂强度提高91%。当云母粉用量为40份、A-151用量为2份时,胶料的最佳硫化温度为170℃。

The dehydrogenation reaction of triphenylsilanol and poly（methylhydrosiloxane） was studied, and the structure of resulting polymer was characterized by the FTIR spectrum, 1H NMR spectra and ^29Si NMR spectra. The result showed that dehydrogenation reaction between triphenylsilanol and poly （methylhydrosiloxane） occurred under both Stannous octanoate and chloroplatinic acid catalyst, with the latter having higher activity. When the mass ratio of triphenylsilanol and hydro-silicone oil was less than 2.20, after 2 h at 110℃, triphenylsilanol was completely consumed.