有机硅改性环氧树脂的制备及其性能研究

Synthesis and Properties of Silicone Modified Epoxy Resin

摘要:

该文研究了各有机硅单体水解和改性环氧树脂的反应条件，最佳反应条件为水解温度为35～40℃，水解时间为1～1.5h,水解用水量为nH2O/ncl=6:1～7:1。通过红外光谱分析表明有机硅主要是与环氧树脂中羟基发生化学反应。对环氧树脂改性前后的力学性能、耐热性和防潮性进行分析, 结果表明：当R/Si为1.5时，改性后树脂固化物的拉伸强度可达23.91 MPa，弯曲强度达到29.24 MPa，冲击强度达到10.02KJ•m-2，50%的质量热损失温度提高到431℃，分别比改性前提高了3.86 MPa，9.49 MPa，6.18 KJ•m-2 ，30℃；同时，改性后树脂防潮性能也得到了提高。

Abstract:

The good silicone modified epoxy resin was synthesized when the hydrolysis temperature was 35~40℃, the hydrolysis time was 1~1.5h ,and the hydrolysis ratio was nH2O/ncl=6:1~7:1.IR indicated that the mainly chemical reaction was occurred between hydroxyls of silicone and epoxy resin.The influence of modified and unmodified epoxy resin on mechanical properties, heat-resistant and moisture resistance was studied.The results show that when R/Si was 1.5, the tensile strength was 23.91MPa ,bending strength was 29.24MPa, the impact strenth was 10.02 KJ•m-2 and the temperatrue of 50% weight loss was 431℃,higher than those of unmodified epoxy resin by 3.86 MPa,9.49 MPa,6.18 KJ•m-2 ,30℃,respectively;At the same time,the moisture resistance of modified resin was increased.