耐高温有机硅改性不饱和聚酯树脂的制备及性能研究

Study on preparation and performance of high temperature organic silicone-modified unsaturated polyester

以甲基三乙氧基硅烷、二苯基硅二醇和乙烯基三乙氧基硅烷为原料首先合成出了有机硅树脂预聚体,然后将其添加到不饱和聚酯合成步骤中。通过有机硅预聚体上的硅羟基和乙氧基与不饱和聚酯上的羟基进行缩合反应来完成整个改性过程,最终制备出耐高温有机硅改性不饱和聚酯树脂。采用IR、TGA对不饱和聚酯改性前后的结构与性能进行了表征和分析。IR测试结果表明:有机硅树脂的分子结构成功的引入到不饱和聚酯树脂的分子链上。TGA测试结果表明:不饱和聚酯树脂经有机硅改性之后其起始分解温度从295℃上升到了340℃,耐热性能得到了显著的提高。此外,对有机硅改性前后不饱和聚酯树脂的体积电阻率和吸水率进行了测试,结果显示有机硅分子结构的引入不但可以提高不饱和聚酯树脂的耐热性能,还可以改善其电性能和防水性。

With methyl triethoxysilane,diphenyl silandiol and vinyl triethoxy silane as raw material,organic silicone prepolymer was prepared and added into unsaturated polyester prepolymer during polymerization of unsaturated polyester. Organic silicone modified unsaturated polyester was prepared through condensation reaction between the functional groups of organic silicone prepolymer and unsaturated polyester prepolymer. The structures and properties of the polyester were investigated by IR and TGA. The result of IR showed that molecular structure of silicone resin was introduced into the unsaturated polyester system. And the result of TGA showed that initial decomposition temperature of the polyester was rised from 295℃ to 340℃ after organic silicone modifying. Additionally,volume resistivity and water absorption of the polyester were tested. The results showed that the electrical and waterproof properties of the polyester can also be improved besides heat resistance performance.