The whole can be divided into two categories: thermosetting and thermoplastic. Moreover, after the low molecular weight prepolymer is cured, It can form network cross-linked macromolecules, so the coating has better anti-corrosion and mechanical properties. Adding additives can improve the adhesion to metal.

Epoxy powder coatings are the first to be used in thermosetting powder coatings due to their excellent adhesion to metals, corrosion resistance, hardness, flexibility and impact strength. The chemical stability is second only to polytetrafluoroethylene. Epoxy polyester powder coating Epoxy polyester powder coating is a powder coating made of epoxy resin and polyester resin as the main raw material.

Polyvinyl chloride powder coating. It can prevent food contamination and has high insulation strength for electrostatic spraying. However,electrostatic powder coating paint there are some shortcomings, such as high melting temperature, low coloring level, and poor adhesion to metal surfaces. The contribution of these several components to the performance of the formed powder coating is mutually restricted and affects each other.

These characteristics make thermoplastic powder coatings occupy a large proportion of the coatings market. Acrylic powder coating Acrylic resin powder coating has two types: thermoplastic and thermosetting. It is not easy to turn yellow during the baking process, has high gloss, good leveling, full paint film, and light color.

Polyethylene powder paint coating has excellent corrosion resistance, chemical resistance and excellent electrical insulation and ultraviolet radiation resistance.The disadvantage is that it has poor adhesion to metal. The coating film has good corrosion resistance and anti-dissolution performance against a variety of acids, alkalis and solvents. 

Megosztás a facebookon

In addition, the amount of pigments and fillers also has a certain impact on the degree of temperature resistance. When the relevance is met, the resin is generally added with appropriate organic Silicone to solve the problem. The temperature range between 270 and 350 °C is a more sensitive range point for silicone high temperature resistant powder coatings. At present, silicone resins used in high temperature resistant powder coatings are mainly divided into the following two types: Methyl polysiloxane is characterized by: good hardness; good water repellency; low surface energy and non-stick effect;-good yellowing resistance at high temperatures; but poor miscibility with other organic resins.

The optimal dosage range is determined to be between furniture powder coatings Factory 60% and 100% (compared to the resin problem). At present, heat-resistant powder coatings are still dominated by organic silicon powder coatings. Silicone resin can be used as a base material alone or combined with polyester and epoxy resin to improve the high temperature resistance of the coating film. Phenyl polysiloxane, good miscibility; good flexibility; good gloss and color retention.

Silicone resin is an indispensable base material for high temperature resistant powder coatings. However, if the silicone resin is used alone, the intermolecular force is relatively small, the adhesion is poor, and the price is relatively high.

High temperature resistant powder coatings are mainly composed of high temperature resistant resins, high temperature resistant pigments, high temperature resistant fillers and special effect additives; due to high temperature resistance, they are widely used in chemical, petroleum, metallurgical, aviation and other industries. Of course, the actual dosage of different silicone resins needs to be determined experimentally.

In addition, due to the agglomeration of low Tg silicone resins during storage, production and transportation, the development of high Tg (glass transition temperature) silicone resins has become inevitable. Good hot and cold alternation. We know that silicone resins are mainly based on silicon-oxygen bonds.3, the heat resistance time of the coating film rises from about 50h to 100h. 

Megosztás a facebookon