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Aug 7, 2024
In addition to heat resistance, silicone coatings also have characteristics such as weather resistance, water resistance, resistance to various gases and vapors, resistance to ozone and ultraviolet degradation. Therefore, it has been widely used as a heat-resistant and anti-corrosion coating for flue gas, boilers, electric furnaces, various heaters, cement roasting furnaces, petroleum cracking furnaces, and as an insulation protection coating for aircraft, missiles, spacecraft, etc. It can work for a long time at 250-300 ℃ and maintain its color and luster.
People usually use paint to coat the surface of metal parts and other materials to prevent corrosion, but organic varnish and porcelain paint are not heat-resistant. When the temperature is above 150 ℃, most of the organic resin carbonizes, and when the temperature is below -50~-70 ℃, it becomes brittle, causing the coating to peel off from the material surface. Organic silicone resin has excellent high temperature and weather resistance, making it an ideal material for high-temperature coatings.
Heat resistant silicone anti-corrosion coatings are usually divided into two categories: coatings used below 260 ℃ and coatings used within the range of 260~650 ℃. The former usually uses modified silicone resin (with a silicone content of about 25% to 30%) as the base material, while the latter has a higher silicone content. The higher the usage temperature, the higher the required organic silicon content.
When preparing silicone heat-resistant coatings, in addition to the film-forming silicone resin solution, fillers (such as mica powder, talc powder, glass powder, etc.) and pigments (usually thermally stable inorganic pigments such as aluminum powder, zinc powder, carbon black, etc.) need to be added. To accelerate the curing speed of the paint film, various catalysts can be used. Catalysts are generally octanoic acid salts or cyclic carbonates of zinc, diamond, magnesium, and iron, with zinc octanoic acid being the most effective.
The domestic coating industry uses epoxy modified silicone resin W30-5 cold spliced with 4% to 10% amino resin, then mixed with glass material and high-temperature pigment to produce a heat-resistant anti-corrosion coating that can withstand 900 ℃. This coating has good resistance to air, salt spray, moisture, and can withstand the scouring, thermal shock, high-speed rotation, and sudden temperature changes caused by high-temperature airflow.In high-temperature resistant coatings, the main function of glass or ceramic sintered materials is that when organic film-forming substances lose their adhesion due to decomposition at a certain temperature, glass or ceramic sintered materials take over the adhesion and film-forming properties of organic film-forming substances to pigments and base metals, forming a new dense layer to withstand the effects of heat, oxidation, corrosion, and airflow erosion at high temperatures.