The curing reaction of the silicone rubber adhesive depends on the cross-linking agent and the catalyst. The type and amount of the two directly determine the curing quality and curing rate, which affects the bonding quality of the system.

Xie Zemin et al. Used a new type of silicon nitrogen polymer as the crosslinking agent. Studies have shown that the cross-linking agent can quickly react with the hydroxyl groups in the silicone rubber, thereby achieving a non-catalytic curing reaction of the silicone rubber and avoiding the degradation of the main chain caused by the addition of the catalyst. In addition, excess silicon nitrogen polymer can remove the adsorbed water and silicon hydroxyl groups remaining in the silicone rubber, thereby eliminating the main chain break phenomenon caused by the hydroxyl groups, thereby improving the heat resistance, mechanical properties and adhesive properties of the system.

The improved alcohol-type cross-linking agent is applied to the curing process of the hydroxyl-terminated polydimethylsiloxane, and a thermally conductive and temperature-resistant filler is added to obtain an improved alcohol-type one-component RTV-type silicone rubber product (using temperature of- 60 ~ 300 ℃). Improved alcohol type crosslinker is a methyltrimethyl (eth) oxysilane containing different organic functional groups.

Fan Zhaodong et al. Used silicon-nitrogen oligomers with a Si-N functionality ≥ and low concentrations of organotin as crosslinking agents and catalysts, respectively, to perform the vulcanization reaction of two-component silicone rubber. Research shows that at room temperature, the Si—N bond can undergo condensation and cross-linking reaction with the silicon hydroxyl group in 107 glue, and the prepared adhesive can be used for the bonding of metal (aluminum, stainless steel, titanium alloy, etc.), silicone rubber and other materials (The joint strength exceeds 2.0 MPa); the adhesive has the characteristics of simple bonding process, no adhesive treatment on the bonding surface, curing without relying on moisture in the air, and its long-term use temperature can reach 300 ~ 350 ℃ Non-corrosive to metal surface, has been successfully applied to aircraft airborne equipment and other occasions.






Sun Fu has developed an organotin-free silicone rubber room temperature vulcanizing agent. Studies have shown that the vulcanizing agent integrates cross-linking agent and accelerator to reduce the toxicity of two-component RTV type silicone rubber. It has a wide range of proportion with silicone rubber, easy to use and good process performance. In the condensation reaction with liquid silicone rubber, the vulcanizing agent can function as a modifier; at the same time, the vulcanizing agent reacts with the hydroxyl-terminated macromolecular prepolymer and the remaining silicone small molecule monomer, and consumes Small molecules, thereby comprehensively improving the performance of silicone rubber.

Cai Xiqing et al. Studied the effect of polymethylacetone oxime siloxane (PMKS) crosslinker on the curing and mechanical properties of silicone rubber. Studies show that in addition to the cross-linking effect of PMKS, a reduced phase forms a PMKS microphase with high cross-linking density, and the micro-phase can significantly enhance the performance of silicone rubber.

Li Zhichao studied the influence of hydrogen-containing silicone oil cross-linking agents with different hydrogen contents on the properties of silicone rubber. Studies have shown that the elongation at break of silicone rubber is directly proportional to the hydrogen content of the crosslinking agent, and the tensile strength and hardness are inversely proportional to it.

Liu Guangxun et al. Compared the effects of two types of crosslinkers, ethyl orthosilicate and hydrogen-containing silicone oil, on the thermal stability of high-strength condensation RTV silicone rubber. Studies have shown that under normal temperature and hot air aging conditions, the tensile strength, elongation at break, and tear strength of silicone rubber with hydrogen-containing silicone oil as a cross-linking agent are significantly improved.