Properties and USES of aluminum powder
Properties and USES of aluminum powder
Aluminum powder with silver white metallic luster, so commonly known as aluminum or silver powder, its chemical composition is actually "aluminum", not "silver". Application: powder coating, ink, plastic masterbatch, printing, imitation gold paper, imitation gold card, gold film, textile, but in water-based paint and paint with acid and alkali will oxidize black. It is not recommended for use where acid and alkali resistance is required and combined with rain water.
Superfine silver powder
The surface area of ultrafine floating silver is large, when it is exposed to air, it can quickly generate a layer of dull protective film on its surface, namely oxidation blackening, sealing measures should be taken. Floating silver is not recommended for the occasion requiring alkali resistance, if there is a requirement, silver white pearl powder can be considered; 2, there are certain differences between the batches of silver powder, and by the process, spray larger impact, in addition to the need to try to maintain the stability of the production process, should first test reproduction, so as to avoid expanding the loss. 3. The added amount of ultra-fine silver cover bottom is 1-2%, and it can cover the bottom with a strong metallic luster of 0.6%-1.5% in the case of adding high-gloss wax AW500B. The larger the added amount of silver powder is, the whiter it is, and the smaller the added amount is, the more blue it will be. 4. Silver floatation is flake-like, always floating in the outer layer of the coating, so the hardness and anti-oxidation blackening performance is slightly poor, to get a good hardness need to add anti-printing hardening agent AS501, plus silver powder hardening agent POL16, POL09, etc., can not add high-gloss wax, gold and silver powder permutation agent, polyethylene wax, etc., the longer the mixing time the better the effect.
Floating silver
1. The smaller the particle size of silver powder, the stronger the metal sense, and the stronger the hiding power; It is easy to spit powder and block the gun head if the dosage is too large. When insufficient amount is added, it is easy to appear black spots, hairlines or small stripes. R18 R01, special effects, such as the new silver dispersant is the efficient dispersant with SIO2 as carrier, is different from ordinary silver dispersant, no matter how many can be evenly dispersed without adding silver black spots, and thus can be modulated by adjusting the base and reduce the dosage of silver grey black, blue and silver powder of different hue effect, add the dinky, convection ping has a good role in promoting. In addition to the sheet material together with grinding, not directly in addition, directly in addition to produce a material and white point, R01 effect is the best, directly dry mixing without particles.
2, floating aluminum powder flake structure in the grinding and extrusion process will be destroyed (deformation or crushing), the result of the color gray, so the general use of dry mixing method.
The floating silver
Non-float silver evenly, parallel distribution in the whole coating film, and is wrapped in resin, so it has good oxidation resistance and wear resistance, good weather resistance, acid and alkali resistance, no handprint, bright surface, and color can be adjusted from the base powder, but add more than float silver, metal effect without float silver strong, white. 2, PCR\DIS aluminum powder is especially suitable for outdoor products, because of the inorganic coating, has good water resistance, weather resistance, chemical resistance; Although coated with silicon and other materials, but in the natural insolation environment, aluminum powder in light and humidity and other conditions, will soon occur oxidation and other chemical and physical changes, so that the metal sense weakened, coating gray hair dark, gray spots and so on. In order to solve this kind of problem and be abrade wait for a problem, suggest to cover with transparent pink smooth. 3. The amount added to the bottom of the cover was tested with transparent powder, and the amount added to silver could reach about 10% at most; Mixing and spraying process directly affects the spraying and covering effect. Please pay attention to the uniformity of mixing and spraying. The coarser the particle size, the better the scintillation effect. 4. There are differences between silver powder particles and powders in shape, density and charge amount, which may cause separation and affect powders. Bunding technology was used to bond the powder with silver powder. 5, aluminum powder can withstand high temperature 600 degrees does not change color.
