(1) Performance
High-temperature-resistant powder coatings refer to protective coatings that can withstand high temperatures above 200C for a long time without changing the color of the coating film and maintaining proper physical and mechanical properties without damage. It not only has the performance of ordinary powder coatings, but also has special , and is especially suitable for coating protection of high temperature parts of various equipment.
High temperature resistant powder coatings are composed of heat resistant resin materials combined with inorganic additives that help to improve the heat resistance and aging resistance of the coating. Commonly used heat-resistant resin materials are: silicone polymers, organic fluorine polymers, polyaryl sulfones, polyparaphenylene and their heterocyclic polymers (such as polyimide and benzimidazole, etc.), of which the most used It is epoxy modified silicone. However, it is still difficult to use these heat-resistant polymers to form a coating film that can withstand high temperatures above 400C for a long time. For this reason, heat-resistant pigments and fillers, antioxidants, free radical commonly used pigments and fillers are aluminum Powder, mica powder, stainless steel powder, cadmium powder, iron powder, silicon powder antimony oxide, zinc oxide, chromium oxide green, carbon black, graphite, titanium dioxide, etc.
In the coating, these pigments and fillers form a heat-resistant skeleton, which greatly improves the thermal stability . For example, the flake structure of mica powder can improve the compactness of the coating, prevent moisture from penetrating, and provide excellent resistance Heat resistance, water resistance, acid and alkali resistance and good electrical insulation. The fine-grained structure of micropowdertalcum powder can improve the hardness, heat resistance and wear resistance of the coating. Combining all three will give you the desired crack resistance.