以甲基乙烯基硅橡胶为基胶,研究了结构化控制剂、苯基乙烯基硅橡胶共混比例和金属氧化物耐热剂对硅橡胶耐高温性能的影响。结果表明:在250℃老化环境下,通过调整羟基硅油和六甲基二硅氮烷用量为3份和6份、甲基乙烯基硅橡胶和苯基乙烯基硅橡胶共混质量比为80∶20,能明显提高耐热氧老化性能。但在300℃高温环境中,仅通过优化基础配方达不到此温度下的使用要求,需要加入金属氧化物耐热剂进一步提高硅橡胶耐高温性能,其中添加自制稀土氧化物的硅橡胶在300℃/48h老化后拉伸强度保持率为78.7%,断裂伸长率保持率为46.2%,老化系数为0.36,且适用于制备浅色橡胶制品。
Taking methyl vinyl silicone rubber as the base rubber,the effects of structured control agents,the blending ratio of phenyl vinyl silicone rubber,and metal oxide heat-resistant agents on the high-temperature resistance of silicone rubber were studied.The results showed that under the aging environment of 250℃,by adjusting the dosage of hydroxyl silicone oil and hexamethyldisilazane to 3 parts and 6 parts,respectively,and the blending ratio of methyl vinyl silicone rubber and phenyl vinyl silicone rubber to 80∶20,the thermal-oxidative aging resistance could be significantly improved.However,in the high-temperature environment of 300℃,the basic formula optimization alone could not meet the performance requirements at this temperature.It was necessary to add metal oxide heat-resistant agents to further improve the high-temperature resistance of silicone rubber.Among them,the silicone rubber containing self-made rare earth oxides had a tensile strength retention rate of 78.7%,an elongation at break retention rate of 46.2%,and an aging coefficient of 0.36 after aging at 300℃ for 48 hours,and it was suitable for preparing light-colored rubber products.
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基金资助
包头市科技计划项目(20210168);内蒙古自治区自然基金项目(2023LHMS02008)
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