The formula of epoxy powder coating mainly includes the following ingredients:
Epoxy resin: Bisphenol A epoxy resin is usually used. Other epoxy resins with good heat resistance include bisphenol A novolac epoxy and naphthalene novolac epoxy. The selection of these resins will affect the heat resistance and other properties of the coating.
Curing agent: The selection of curing agent has an important influence on the performance of the coating, including silicone resin modified epoxy resin.
Color filler: Used to improve the mechanical properties and anti-corrosion properties of the coating.
Other additives: Such as antioxidants and hindered amines, etc., used to improve the appearance and stability of the coating.
Preparation method: Heat the epoxy resin to a certain temperature, add the curing agent and other additives, stir evenly, unload the reaction material on a stainless steel iron plate, crush, grind and sieve after cooling, and collect powder of appropriate particle size.
Performance requirements:
Heat resistance: Epoxy powder coatings need to be able to maintain physical and mechanical properties at high temperatures.
Mechanical properties: including initial and later mechanical properties, and the later mechanical properties cannot be reduced too much.
Anti-corrosion properties: epoxy resin itself has good anti-corrosion properties, and the coating must meet this requirement.
Appearance: including flatness, gloss and color, etc., which need to be adjusted according to the requirements of use.
Storage stability: the coating should remain stable during storage.
Through the description of the above formula and preparation method, we can better understand the production process of epoxy powder coating and its performance requirements.