Properties and uses of aluminum powder
Aluminum powder with silver-white metallic luster, commonly known as aluminum powder or silver powder, its chemical composition is actually "aluminum" rather than "silver". Application: powder coating, ink, plastic masterbatch, printing, imitation gold paper, imitation gold card, gold film, textile, but it will be oxidized and blackened in water-based paint and paint with acid and alkali. It is not recommended for places where acid and alkali resistance and rainwater combination are required.
Ultrafine silver powder
Ultra-fine floating silver has a large surface area, and when exposed to the air, it will quickly form a dull protective film on its surface, that is, oxidation and blackening, and sealing measures should be taken. Silver floating is not recommended for occasions that require alkali resistance, and silver white pearlescent powder can be considered if required; 2. There are certain differences between batches of silver powder, and are greatly affected by the process and spraying. In addition to keeping the production process as stable as possible, you should first 3. Add 1-2% of the ultra-fine silver cover bottom. In the case of adding high-gloss wax AW500B, the bottom cover can have a strong metallic luster of 0.6%-1.5%. The larger the amount of silver powder added, the whiter it is, and the smaller the added amount, the bluer it will be. 4. Floating silver is in the form of flakes and always floats on the outer layer of the coating, so the hardness and anti-oxidation blackening performance are slightly poor. To obtain good hardness, it is necessary to add anti-print hardener AS501, add silver powder hardener POL16, POL09, etc. Add high-gloss wax, gold and silver powder replacement agent, polyethylene wax, etc., the longer the stirring time, the better the effect.
floating silver
1. The smaller the particle size of the silver powder, the stronger the metallic feeling and the stronger the hiding power; if the dosage is too large, it is easy to spit out powder and block the tip of the gun. When the amount added is insufficient, black spots, thin lines or small streaks are easy to appear. R18 R01, special effects, such as the new silver dispersant is a high-efficiency dispersant with SIO2 as the carrier. The amount of black and blue silver powders used for different hue effects is very small, and it has a good effect on leveling. Remove flakes and grind together, do not directly remove, direct removal will produce discharge and white spots, R01 has the best effect, direct dry mixing without particles.
2. The flaky structure of floating aluminum powder will be destroyed (deformed or crushed) during the grinding and extrusion process, resulting in a gray color, so dry mixing is generally used.
floating silver
Non-floating silver is uniform, distributed in parallel throughout the coating film, and is wrapped by resin, so it has good oxidation resistance and wear resistance, good weather resistance, acid and alkali resistance, no fingerprints, bright surface, color adjustable by base powder , but with more floating silver, the metal effect is stronger than floating silver, white. 2. PCR\DIS aluminum powder is especially suitable for outdoor products. Due to the inorganic coating, it has good water resistance, weather resistance, and chemical resistance; Under conditions such as humidity and humidity, chemical and physical changes such as oxidation will quickly occur, which will weaken the metallic feeling, make the coating gray and dark, and gray spots appear. To solve such problems and problems such as wear and tear, it is recommended to use a clear powder mask. 3. The addition amount of the cover bottom is tested with transparent powder, and the silver addition amount can reach up to about 10%; the mixed spraying process directly affects the spraying and covering effect. Pay attention to the uniformity of mixing and spraying. The coarser the particle size, the better the sparkle effect. 4. There are differences between silver powder particles and powder in terms of shape, density, charge, etc., which may cause separation and affect the powder. Bonding techniques are used to bond powders with silver powder. 5. Aluminum powder can withstand high temperature of 600 degrees without changing color.
