Breathing epoxy polyester mixed type powder paint

Abstract

The invention discloses a permeable epoxy polyester mixed powder coating, belonging to the field of powder coating technique of static coating. According to the weight percentage of the compounding, the coating consists of 25-18 percent of epoxy resin, 25-42 percent of indoor polyester resin, 0.8-5 percent of leveling agent, 1-20 percent of pigment, degasifying agent, and the rest of filling materials and other normal auxiliary agents; the preparation method is carried out by the production process of the existing powder coating. The coating is characterized in that the degassifying agent is one of polyethylene wax APP230F, 230VF, 230XF, 620F, 620VF and 620XF and occupies the weight percentage of 0.1-0.8 percent compared with the total weight. The permeable epoxy powder coating has the advantages of outstanding degassifying effect, being widely used for the powder coating disposal of devices such as castings, flat and smooth surface of the coating, good construction performance and excellent internal quality.

Description

technical field [0001] The invention relates to a gas-permeable epoxy-polyester mixed powder coating, which belongs to the technical field of electrostatic coating powder coatings. Background technique [0002] Powder coatings have been widely used and developed at home and abroad. In powder coating, due to the existence of pores in the substrate (such as castings) or improper pre-treatment processes (such as galvanizing, phosphating) on ​​some workpieces, it often leads to coating problems. Obvious bubbles, shrinkage cavities, pinholes or particles appear on the surface of the coating, which seriously damages the decorative and aesthetic effect of the coating surface, and even endangers the anti-corrosion life of the coating. [0003] Air-permeable powder coatings are mainly functional powder coatings composed of resins, fillers and degassing additives. They have good degassing function and smooth surface of the coating film. They are suitable for cast iron, cast aluminum, ...

AI Technical Summary

Problems solved by technology

Benzoin is widely used in general powder coatings, but its degassing effect is weak. For the above-mentioned castings and other workpieces, its degassing effect is very poor, and it is difficult to remove the gas that enters the molten coating from the inside of the substrate in a timely and effective manner. , the coating still has significant defects such as bubbles, shrinkage cavities, and particles

[0005] In recent years, some manufacturers have introduced a lot of degassing agents, such as domestic SA500, foreign PW-188 and other products. The above degassing agents can effectively replace benzoin in ordinary powder coatings. Although yellowing is avoided, it is also It is difficult to efficiently remove a large amount of gas contained in the molten coating, and it is impossible to guarantee the decorative effect of the coating surface of castings.