According to the use of coating, it can be divided into silicone heat-resistant coating, silicone weather-resistant coating, silicone insulating coating, silicone elastic coating, silicone waterproof coating and so on.
① silicone heat-resistant coating heat-resistant coating refers to the coating that can withstand more than 200 temperature for a long time. Silicone heat-resistant coatings have excellent heat-resistant properties and begin to decompose at about 300 ℃. They are widely used in heat-resistant coatings. Table 2 lists the common silicone heat-resistant coatings in China. The performance of silicone heat resistant coating is related to the methyl/phenyl value contained in the silicone oligomer, because the phenyl group has better heat resistance and poor physical and mechanical properties than the methyl group.
The pigments used for silicone heat-resistant coatings should be heat-resistant, and appropriate pigments should be selected according to actual requirements. The following table lists the pigments used in common silicone heat resistant coatings and their temperatures. Anti - rust pigments are strontium yellow and zinc phosphate. Lead pigments should not be used in silicone heat resistant coatings because lead pigments can reduce the heat resistance of the coating film.
② silicone insulation coating
Silicone insulating coating is a kind of very important insulating coating. It belongs to class H insulating material and its heat resistance grade is 180 ℃. It has excellent thermal oxidation stability and insulation performance, moisture resistance, wide range of use, insulation resistance in a wide temperature range (-50-250 ℃) and high and low frequency range can be used normally, it is worth mentioning that when damaged at high temperature, generally will not burn, will not form coke and conduct, the residual material for Si02. Silicone insulation coating has a wide range of applications. It can be used as high and low temperature insulation paint, silicone adhesive insulation coating, silicone insulation impregnation coating, silicone insulation covering enamel, silicone silicon steel sheet insulation paint, silicone electrical components paint, flame retardant silicone insulation coating, silicone moisture-proof insulation coating, etc.
③ organosilicon weather resistant coating
Silicone weather-resistant coating generally uses alkyd, polyester, acrylic resin modified silicone resin, is a kind of most used weather-resistant coating, this kind of coating can withstand a variety of natural changes in the outdoors. Alkyd modified silicone weather-resistant coating with a life of 8-10 years, cheap, room temperature curing, a wide range of applications, can be used for outdoor facilities and equipment coating; Polyester and acrylic acid modified silicone weathering coating curing agent for melamine resin, used for civil construction, building waterproof coating.