Matting agent physical extinction purposes
Matting agents Depending on the application, semi-gloss or matte powder coatings are sometimes required. In order to reduce the coating gloss, commonly used matting agents are ultrafine silica, talc, aluminum stearate, calcium stearate, low molecular weight thermoplastic resins.
To get the matting effect, you can use the following method:
a, the curing rate of different powder coatings, mixed with dry mixing method, then the resulting coating significantly reduced gloss, play a matting effect. Due to the rapid curing of highly reactive powder coatings, the leveling and reaction of the slower-curing resins of the continuous phase is hindered and the finished cured coating loses its luster. Although this method is effective, but increase manufacturing processes and costs. The company is located in:
b, add thermoplastic resin. In the epoxy powder coating added cellulose acetate, polyester powder coating added to the fine powder of low molecular weight polyethylene, polypropylene resin can be matting powder coating. Film gloss by the conditions of manufacture. Because the addition of the thermoplastic resin will affect the storage stability of the powder coating, the addition amount is limited to 23% of the resin amount. The company is located in:
c, with a special curing agent matting effect. The company is located in:
d, adding extinction of the filler. Add ultra-fine silica, talc and other fillers so that significantly reduced gloss. In particular, the particle size of the filler film has a great impact on gloss. The larger the particle size, the lower the gloss. It should be noted that increasing the amount of filler, will make the coating film flatness and mechanical strength decreased. In the epoxy powder coating, the effect of calcium carbonate particle size on the gloss of the coating is shown in the table. In the acrylic, polyester powder coating added ultrafine silica and kaolin to get matting paint. The company is located in:
In addition, addition of waxes such as polyethylene waxes and hydrogenated castor oil also results in matte coatings.