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Oct 11, 2024
Silicone adhesives are adhesives based on linear or branched silicone polymer compounds. It can be divided into two categories: adhesives (including coatings) based on silicone resin and adhesives (including sealing materials) based on silicone rubber (silicone elastomer). There is a difference in connection density, so the final performance is different.The chemical structures of the two are different: the main chain structure of silicone resin is composed of silicon-oxygen bonds, which is a three-dimensional structure that can be further condensed at high temperatures to become a highly cross-linked hard and brittle resin. Silicone elastomer, also known as silicone rubber, is a polymer elastic material with a main chain structure composed of strong silicon-oxygen bonds, with a molecular weight ranging from tens of thousands to hundreds of thousands. It must be condensed into a cross-linked elastomer under the action of a vulcanizing agent or catalyst. Due to the different cross-linking densities of the two, there are differences in the final physical form and properties.
At present, among synthetic adhesives, the production and usage of silicone adhesives account for a small proportion. Although they are structural adhesives, they are often used as non-structural adhesives, but they have wide and important applications. This is different from other adhesives. Drugs cannot replace it.Because silicone adhesives contain Si-0 bonds with an inorganic structure, they have certain characteristics of organic and inorganic materials. They can maintain unchanged physical and chemical properties in a wide temperature range (-60~+1200℃), especially in It has excellent thermal stability at high temperatures, so it is often used as a high-temperature protective layer.At the same time, it has excellent water resistance, weather resistance, radiation resistance, corrosion resistance, electrical insulation, waterproofness and climate resistance. Pure silicone resin adhesive can be used at -60~400℃ for a long time and up to 450~500℃ for a short time. Silicone resin adhesive has the characteristics of good water resistance, medium resistance and weather resistance, but its shortcomings of brittleness and low bonding strength affect its application. At present, in order to obtain better high-temperature physical and chemical properties, resins such as phenol alcohol, epoxy, polyester, and polyurethane are usually used to modify them. Can be bonded to metal, plastic, rubber, glass, ceramics, etc. It has been widely used in aerospace, aircraft manufacturing, electronic and electrical industries, machining, automobile manufacturing, construction and medical treatment.