Organic Silicon Heat-resistant Coating
Aug 2, 2024
The formula for silicone heat-resistant coatings is mainly based on the selection of silicone resin and pigment fillers according to different usage conditions. Heat resistant coatings that are only affected by high temperatures are generally formulated with pure silicone resin to have high heat resistance. High temperature coatings that require oil resistance and wear resistance, such as heat-resistant coatings for aviation, often use epoxy modified silicone resin. Heat resistant coatings that require electrical insulation and moisture resistance often use polyacetylated modified silicone resin. Organic silicon zinc foundation make-up is mostly used as high-temperature anti-corrosion coating for outdoor steel, which has electrochemical protection effect on steel surface. The heat-resistant coatings used for aluminum alloys often use organic silicon primers formulated by Dehuang, as they have passivation and anti-corrosion effects on aluminum alloys. Organic silicone paint filled with lead powder can generally withstand heat up to 500℃. Low melting point glass material is often added to high-temperature resistant coatings above 500℃, with a heat resistance of up to 500-800℃.
Organic silicon heat-resistant coatings are generally formulated with organic silicon resin, heat-resistant pigments, and fillers. The pigments used are mostly metal oxides, and the fillers are mostly silicate type fillers. The addition of these pigments and fillers not only strengthens the organic silicon coating, but also generates certain chemical reactions between them during the grinding process and at high temperatures.Silicic acid fillers such as mica, asbestos, talcum powder, and kaolin have a small amount of shin groups on their surface, which can react with functional groups of polyorganosiloxane. The presence of metal oxides can catalyze the above reaction and form metal siloxane structures in the main chain. The higher the fineness of silicate fillers, the greater their surface activity. Organic silicon heat-resistant coatings generally undergo intense thermal decomposition at 400 to 600℃, causing damage to the side chain organic groups and main chains of polydimethylsiloxane. Active centers are formed at the locations where the organic groups and silicon oxygen bonds break, further interacting with silicates and oxides. This effect does not cause damage to the silicone heat-resistant coating, but rather strengthens it.
The results of these thermophysical chemical reactions bind organic organic silicon oxides and silicates together, ensuring excellent performance of organic silicon heat-resistant coatings.
The ratio between silicone resin and pigment filler varies depending on the required heat resistance temperature and usage conditions. Decorative heat-resistant coatings with a color to base ratio of 0 can be used 2~0. 8. This heat-resistant coating has luster and can maintain its luster below 300℃, while above 300℃ it is prone to loss of gloss and damage. For heat-resistant coatings with high heat resistance temperatures (above 300℃), a higher color to base ratio is generally used. If the organic silicate heat-resistant coating adopts a color to base ratio of 2, this heat-resistant coating is matte but has excellent heat resistance. Heat resistant coatings containing glass materials can be melted and sintered at high temperatures to obtain coatings similar to ceramics.
Our main products are Acrylic Modified Silicone Resin Emulsion,Epoxy Modified Silicone Resin Emulsion,Smokeless Silicone Resin,Silicone Resin for motor coil wrapping,Self-drying Silicone Resin,Highly Active Silicone Resin,Methyl Silicone Resin Intermediate.
