The characteristics and main applications of metal effect powder coating

China Coatings Online News Information: Metal effect powder coating (referred to as metal powder) in the whole decorative coating application is wide, is currently the mainstream of art powder. There are many kinds of metal pigments that can be used in powder coatings, which can be divided into four categories, namely aluminum silver powder pigments, pearlescent pigments, copper and gold pigments and other metal pigments (e.g. nickel powder, stainless steel powder, etc.). Each type of metal pigment also contains a lot of color products, applied to the powder, it makes the powder colorful, greatly enriched the variety and decoration of powder coatings. Metal powder is now mainly used in indoor and outdoor metal furniture, lamps, handicrafts, smoke machines, strollers, sports equipment and other industries.
aluminum silver powder: aluminum powder pigments are divided into floating and non-floating two. Floating aluminum powder added to the powder coating, after baking can mostly form a continuous phase on the surface of the coating, sometimes with a mirror effect.
non-floating aluminum powder: this aluminum powder is usually particle size >20 m, the surface is generally treated with coating, coating material is mainly silicone. The thicker the non-floating aluminum powder size, the better the flickering effect. Because its surface is covered, it has good acid resistance and alkalinity, and has a certain degree of outdoor durability. Powder coatings with non-floating aluminum powder can be sprayed with demanding work items such as washing machine housings and motorcycle engine housings. The addition ratio of the post-mixed non-floating aluminum powder is very wide, and the dosing of about 10% has not had much effect on the powder spraying. At present, the domestic powder factory application of more popular non-floating aluminum powder is the German company's PCR series of products.
floating aluminum powder in powder coating applications are more popular, floating aluminum powder in the high-fold microscope to observe the multi-thin sheet, the average particle size is generally <20 m, the smaller the particle size of the metal sense is stronger, the greater the cover force. The most metallic should be the chrome-plated effect, which is most popular in the current market. The development and production of chromium-plated powder coatings must start with the selection of base powder formulations and aluminum powders, the following formulations can be used as a reference.
the name of the raw material
P6060 45 DSM resin, acid value 55mgKOH/g
E-12 25 epoxy resin,
GLP5035 leveling agent
BENZOIN 0.5 defoulant
TiO23.5 goldstone titanium white powder
WAX0.5PE wax
BaSO421 ultra-fine sulphate
CBlack0.0012 carbon black
formula selected P6060, because the resin melt viscosity is very small, with E-12 epoxy production of the base powder level is high, gloss is also very high. The role of wax is mainly to improve the ad wear resistance of powder surfaces.
To get the mirror effect, we must choose suitable aluminum powder, recommended Aika's PC100 and BendA-LUTZ company's AL2081, generally added a ratio of 1.5%, the addition of too high easy to produce spitting powder and blocking the gun head phenomenon, the use of too low is no mirror effect.
for floating aluminum powders of other particle sizes (most of which are 10 to 20 m), the addition ratio can also get very good silver effect at 1.5% to 2.0%. When this kind of aluminum powder is added in small amount (e.g. <1%), due to the small amount of aluminum powder, can not adequately cover the base powder, often appear flowering phenomenon, and sometimes also appear fine streaks.