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Organic silicone resin adhesives are a specific type of adhesive that holds a prominent position among heat-resistant adhesives, encompassing various categories such as high-temperature resistant adhesives, heat-resistant sealants, high-temperature strain adhesives, and heat-resistant pressure-sensitive adhesives. The core component of these adhesives is polyorganosiloxane, a linear polymer consisting of alternating silicon and oxygen atoms. After cross-linking and vulcanization, it exhibits excellent high and low-temperature resistance, atmospheric aging resistance, electrical insulation, and elasticity, enabling long-term use within a wide temperature range of -60°C to 200°C with minimal changes in physical and mechanical properties.
Due to their outstanding performance, organic silicone resin adhesives have found wide application in industries such as construction, electronics, automobiles, packaging, and healthcare, demonstrating robust development potential. As demand grows, their uses continue to expand, with varieties and quantities increasing year by year. Notably, the siloxane in organic silicone resin can react with hydroxyl-containing compounds, such as epoxy resins, phenolic resins, and polyesters, providing opportunities for modifying organic silicone adhesives with these resins.
Organic silicone resin adhesives based on pure silicon resin typically use xylene as a solvent and incorporate inorganic fillers such as asbestos powder, mica powder, titanium dioxide, and zinc oxide. These adhesives undergo cross-linking polymerization and curing at high temperatures (270°C), exhibiting excellent high-temperature resistance and the ability to withstand long-term exposure to temperatures of up to 400°C. They are particularly suitable for non-structural bonding and sealing in high-temperature environments. However, pure silicon resin adhesives, due to their high curing temperature and relatively low bonding strength, are typically used only as non-structural adhesives. Modifying them by introducing hydroxyl groups from epoxy resins, phenolic resins, or polyesters to react with the siloxane in silicon resin can maintain their high-temperature resistance while lowering the curing temperature and enhancing bonding strength.
Organic silicone resin is also widely used in the production of anti-stick coatings for rollers, covering various rollers, molds, pipes, engine interiors, food machinery, printing machinery hoppers, frying pan and baking tray anti-stick coatings, and rust-proof, slip-enhancing coatings for safety knives in industries such as textiles, printing and dyeing, papermaking, rubber processing, and plastic processing. Compared to fluororesin non-stick coatings, organic silicone resin non-stick coatings offer advantages such as lower curing temperatures, higher gloss, a wider range of colors, and easier application, making them highly popular among users in practical applications. Although fluororesin non-stick coatings slightly outperform organic silicone resin non-stick coatings in terms of non-stick properties, their drawbacks, including high curing temperatures, complex application processes, low coating gloss, and limited color options, restrict their range of applications.