| Two-component room temperature vulcanized silicone rubber (SR) has excellent resilience, heat resistance, low temperature resistance, insulation, moisture resistance, chemical stability, non-toxicity. In the Machinery and automotive industry, sealing connecting parts appear leakage phenomenon frequently, such as oil spilling, air spilling and water spilling, brought on by a high temperature, high pressure and vibrative operating environment. This paper aims to developing a sort of silicone rubber coat-metals gasket that can be used for the seal of the mechanical components which work at wide-temperature, high pressure and water medium environment. It can be used as the sealing gasket of agricultural machinery, large automobile engine and water pump. The method of silk screen painting is used to paint the SR coating on the surface of Metals Gasket, than we can get the composite gaskets.In this paper, α,ω-hydroxy terminated silicone works as the base gum. Discussions have been carried out separately on the effects of reinforcing agent, vulcanization agent and adding additives on the rheological property, curing rate, cross-linking density, mechanical properties, thermal aging properties and liquid-resistant of silicone rubber sealant. With the help of the analysis means of TG and DSC, the final formula can be determined.The main reinforcing filler is silica hydrated. Studies on the mechanical property and viscosity of SR that used different kinds of silica hydrated as filler. The mechanical properties and viscosity of SR filled with the hydrophobic silica was higher than that of the hydrophilicity silica. With the increase of the specific surface area of silica hydrated, the mechanical properties and viscosity of SR also improves. The choice of dosage use is based on the performance requirements of the product.Ratio of cross-linking agent and catalyst is the main influence factor of vulcanization systeme. Cross-linking agent and catalyst directly affect the performance of SR. This article investigates the effect of vulcanization system that matches cross-linking agents with different space steric hindrance with different kinds of catalyst as to ensure the best proportion.How long does glue can be used as an important factor in the industrial mass production.Adding the Silane coupling agent can control the curing rate of SR. Anti-stickiness is an important property for SR as agents, so some kinds of auxiliaries were studied and the effect of silicone oil was found the best.The method of silk screen painting is used to paint the SR coating on the surface of Metals Gasket. The impaction of metal surface-disposed can improve the cohesive force between SR and base material. |
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