Study of RTV-1 Silicone Rubber with High Temperature Resistance
The properties of deacidified,dealcoholized,deoxime and deacetone silicone rubber under high temperature aging were investigated.The results showed that the deacetone silicone rubber had the best mechanical properties and the highest reten-tion rate after high temperature aging.Therefore based on deacetone silicone rubber,the effects of viscosity and structure of sili-cone gum,fumed silica and heat resistant additives on the high temperature resistance of one component deacetone silicone rubber were investigated.The results show that the oxidation occurs,when the side chain of one component deacetone silicone rubber ag-ing at 200℃.When aging at 300℃,the main chain degradation happens.The low viscosity raw rubber and low phenyl side group is favorable to the high temperature resistant silicone rubber.When fumed silica treated with silazane is used as a reinfor-cing filler,the silicone rubber has better high-temperature resistance.Iron oxide red,cerium oxide,and titanium oxide can im-prove the high temperature resistance of silicone rubber.When titanium dioxide and iron oxide red are used,the silicone rubber significantly improves its high-temperature resistance due to its synergistic effect.After aging at 300℃for 2 hours,the tensile strength and elongation of silicone rubber are kept above 90%.
high temperature resistancenano titanium dioxidedeacetonedegradationroom temperature vulcanizationsilicone rubber
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