Air permeable pure polyester powdery paints

Abstract

The invention discloses a pure polyester powder coating with permeability, pertaining to the powder coating technique field of electrostatic coating. According to weight proportion, the components of the invention are 50 to 60 percent of outdoor polyester resin, 3 to 5 percent of curing agent, 0.8 to 5 percent of flow agent, 1 to 20 percent of pigment, 0.1 to 0.8 percent of degasifying agent, other additives and excessive materials filler. The invention is produced by using the existing powder coating production technique, and the degasifying agent is one of the polyethylene waxes of APP230F, 230VF, 620F, 620VF, 620XF. The invention has the advantages of being widely applicable to powder coating treatment of devices such as castings, etc., and having smooth coating surface, and good construction performance and internal quality.

Description

Technical field [0001] The invention relates to a gas-permeable pure polyester powder coating, which belongs to the technical field of powder coatings for electrostatic coatings. Background technique [0002] Powder coatings have been widely used and developed at home and abroad. In powder coating, some workpieces are often caused by pores in the substrate (such as castings) or improper pretreatment processes (such as galvanizing, phosphating). Obvious bubbles, shrinkage holes, 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] Breathable powder coatings are mainly functional powder coatings composed of resins, fillers and degassing additives. They have good degassing function and flatness of the coating film surface. They are suitable for cast iron, cast aluminum, hot-rolled plates and other series with rough surface of ...

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.