含乙烯基硅树脂交联剂对硅橡胶热性能的影响

EFFECTS OF VINYL-CONTAINING SILOXANE RESIN CROSSLINKER ON THE HEAT STABILITY OF SILICONE RUBBER

以混合氯硅烷及烷氧基硅烷的共缩聚制备了含乙烯基硅树脂(VSR),并将其作为高温硫化硅橡胶(HCSR)的交联剂。由于硅树脂的集中交联对成环降解的阻碍作用,所得硫化胶的热稳定性和老化性能得到提高,并且VSR中含有苯基单元时,所得硫化胶的热空气老化性能更好。

?Vinylcontaining siloxane resins (VSR) were synthesised and used as the crosslinker of heatcurable silicone rubber(HCSR).The heat stability and agingresistance of silicone rubber were improved for the microcrosslinked structure in VSR,which could form effective 'concentrative crosslinking' and interfere the degradation of main chain.Valcanizates using phenylcontaining VSR as crosslinker exhibited higher aging resistance.