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Preparation and Characterization of Room Temperature Vulcanized Silicone Rubber Adhesive

Author: HeZhiHui
Tutor: ZhengJunPing
School: Tianjin University
Course: Materials Science
Keywords: Silicone rubber adhesive Mechanical properties Adhesive properties Thermal stability Bonding mechanism Thermal aging mechanism
CLC: TQ339
Type: Master's thesis
Year: 2009
Downloads: 247
Quote: 1
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Abstract


The silicone rubber having excellent thermal stability, chemical inertness, environmental stability, outstanding hydrophobicity, good electrical insulating properties and low compression permanent deformation. Due to its thermal stability and thermal oxidative decomposition characteristics of silicone rubber is widely used in high temperature applications. The purpose of this paper is the preparation of high temperature, high insulation, adhesives, silicone rubber seal has good adhesive properties and process performance research adhesive components affect the overall performance of the adhesive, and TGA, X-ray photoelectron spectroscopy, infrared spectroscopy and other experimental means of adhesive bonding mechanism and thermal gravimetric kinetic mechanism. This thesis select alpha, omega-hydroxy-capped silicone rubber based adhesive 8200 silica as a reinforcing agent, the coated titanium dioxide is heat-resistant additives, and the type of curing system at room temperature vulcanizing silicone rubber adhesive was prepared and studied in each group of the adhesive sub role, affecting the overall performance of the silicone rubber adhesive intrinsic and extrinsic factors were studied in detail. It was found that treated and untreated silica adhesive performance impact is different. Compared to the unmodified silica, silica having a low hydroxyl content, low tackifying effect in 8200, so adding 8200 silica adhesive tensile properties, hardness, better insulating properties than unmodified. The results show that heat additives titania coated titanium dioxide can improve the heat resistance of the adhesive, and it Add also can improve the tensile properties of the adhesive. This paper also studied the impact of different crosslinking systems the overall performance of the silicone rubber, the results show a silane coupling agent B crosslinking system has good heat resistance, but slow curing; curing rate of the silane coupling agent A crosslinking system fast, excellent heat resistance and mechanical properties; ND43 crosslinking system curing speed, heat resistance, mechanical properties and overall performance relative to the other two better. Thermogravimetric analysis showed that the silicone rubber type of weight loss curve, indicating that the silicone rubber adhesive in an open environment and in a closed environment having different mechanisms of degradation in air and under nitrogen. Air conditions, add titanium dioxide, silicon rubber thermogravimetric curve inflection point, when the inflection point temperature is lower than titanium dioxide may improve the initial decomposition temperature of the adhesive having good thermal stability. Inflection point temperature is higher than the accelerated thermal degradation of the silicone rubber. The role of of this thesis adhesive substrate, and the bonding mechanism, etching experimental results show that the chemical bond is formed between the adhesive and the substrate connection. X-ray photoelectron spectroscopy data show that the coordination bond may be formed between the adhesive and the substrate.

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