The high temperature resistant powder coating is mainly composed of high temperature resistant resin, high temperature resistant pigment, high temperature resistant filler and special effect additive; it is widely used in chemical, petroleum, metallurgy, aviation and other industries due to its outstanding high temperature resistance. At present, heat-resistant powder coatings are still dominated by silicone powder coatings. The selection and control of the components in the silicone powder coating is the basis for the high temperature resistant silicone powder coating. 1. Application of silicone resin in high temperature resistant powder coatings The silicone resin is mainly composed of a silicon-oxygen bond, which imparts high oxidative stability to the silicone resin due to its high bond energy, and can form a stable protective layer on the surface of the coating film. The silicone resin alone has a small inter-molecular force, poor adhesion, and high price. Under the premise of satisfying the relevant performance, a moderate amount of silicone resin is generally added to the resin to solve the above problems. The larger the amount of silicone resin added in a certain range, the longer the service life and heat-resisting time of the coating film. When it is mentioned in the literature that the amount of silicone resin increased from 0.1 to 0.3, the heat resistance time of the coating film increased from about 50 h to 100 h. Of course, the actual addition amount of different silicone resins needs to be determined experimentally. 2, the choice of pigments and fillers Because inorganic pigments have superior heat resistance to organic pigments, organic pigments are generally not considered in high temperature resistant powder coatings, and are mainly selected from inorganic pigments and have stable properties; according to related literature, impact resistance of coatings before baking in fillers From good to bad, the order is: wollastonite, mica powder, kaolin > sillimanite > quartz. After the barbecue, the mica powder is the best, and the rest are few. In addition, the amount of pigments and fillers has a certain influence on the degree of temperature resistance. The application of silicone resin heat-resistant powder coatings is determined to be between 60% and 100% (with resin problems). ratio). 3, the choice of additives Choosing the right auxiliaries is also an important part of improving the high temperature and mechanical properties of high temperature resistant powder coatings. For example, an antioxidant, a hardening agent, etc. are added to the high temperature resistant powder. Zonglan continues to be respected as an innovative eyelet machine designer, brass eyelet manufacturer and exporter.
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Material selection for high temperature powder coating formulations
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