Detailed introduction of high temperature resistant powder coatings
Detailed introduction of high temperature resistant Powder coatings
Water is used as the dispersion medium, but air is used as the dispersion medium. It has the characteristics of no volatile attack, easy finishing, no solvent, little damage to operators, high spraying utilization rate, excellent function and so on. With the increase of global attention to environmental protection, the application scope of Powder coatings is becoming more and more extensive. The use of Powder coatings in China has exceeded 1 million tons.
High temperature resistant Powder coatings belong to special functional coatings. According to the accepted temperatures, they are generally distributed at 200 ℃, 300 ℃, 350 ℃, 400 ℃, 500 ℃ and above. It is widely used in barbecue ovens, stewing ovens, heaters, heating pipes, silencing, ovens, vehicle exhaust pipes, chimneys and other equipment. Due to the advantages of high temperature resistant Powder coating in environmental protection, safety and utilization, it will gradually replace the traditional high temperature paint.
In recent years, due to the trend of "paint to powder", the market demand for temperature resistance of 500 ℃ and above is increasing. In the use scenario of 500 ℃ and above, the coating is directly burned by open fire, and the minimum requirement of the coating is not to pulverize and fall. This article comments on this type of product. The formulation of high temperature resistant Powder coating is as follows: resin and its curing agent, which is the basis of coating film formation; Additives to improve the appearance or functions of the coating; Pigment, which endows the coating with concealment and color; Filler, if it has the effect of physical enhancement.
When the commonly used full polyester resin, epoxy resin and other materials are above 350 ℃, the carbon oxygen bond will soon break and differentiate, which is reflected in the powder falling on the coating. Silicone resin is the main resin of high temperature resistant Powder coating because it takes silicone oxygen bond as the main chain and gives silicone resin high oxidation stability due to its high bond energy.