one
The curing dose of resin and the ratio of color and filler were adjusted, and the substrate with higher glass transition temperature of resin and curing agent composition was selected. The choice of polyester resin is very important, such as the monomer of terephthalic acid than phthalic acid in the anti-formation, weather resistance effect is better. In practice, polyester resin is often found to be agglomerated. In the agglomerating formula, the proportion of filler is large, and the possibility of powder agglomeration is small.
two
Add additives: in the powder in addition to silica, alumina, sodium silicate and other inorganic micro powder. Anti-adhesion organic compounds are added to the formula to participate in extrusion, such as oleamide, EBS, polyethylene wax, etc. These two methods, the performance of the coating film, appearance will have an impact.
three
Production process control: the extrusion material sheet should be fully cooled, the grinding environment should be controlled by temperature and humidity, the powder particle size should be properly adjusted, and the cooling package should be packed with 10% space reserved. Powder in the ultra-fine powder, high humidity, high temperature environment. When spraying, it is easy to appear powder.
Ultra low temperature curing powder coating powder, Its feature lies in its percentage content of 48% to 54% by weight of unsaturated polyester resin, 12% - 14% of the crystal resin, 2% - 3.5% of bisphenol S glycidyl ether, 1% - 2% of the flow ping agent, 23% 30.5% of inorganic fillers, 1.5% - 2.5% of the alumina mixes C and 3% - 3.5% of the pigment.
In the spraying process of powder coating powder, only about 100℃ temperature can be cured, so it can be used in wood, engineering plastics and some metal alloy materials and other fields, expanding the application of traditional powder coating powder.