Aluminum powder is commonly known as aluminum silver powder or silver powder because of its silver white metallic luster. Its chemical composition is actually "aluminum", not "silver". Scope of application: powder coatings, printing ink, plastic masterbatch, printing, imitation gold paper, imitation gold card, gold film, textiles, but when used in water-based paint and paint with acid and alkali, it will be oxidized and blackened. It is not recommended to be used where acid and alkali resistance and combination with rain are required. Aluminum silver powder is a major category of metal pigments due to its wide use, large demand and variety. Aluminum powder particles used for pigments are flake shaped, and it is precisely because of this flake shaped particle state that aluminum powder has metallic color and shielding function.

1. Characteristics of scale like covering:

    Aluminum powder particles are in the form of scales, and the ratio of the diameter to the thickness is about (40:1) - (100:1). When aluminum powder is dispersed to the carrier, it is parallel to the substrate. Many aluminum powders are connected with each other, and large and small particles fill each other to form a continuous metal film, covering the substrate and reflecting the light outside the film. This is the unique hiding power of aluminum powder. The covering power of aluminum powder depends on the surface area, that is, the diameter thickness ratio. Aluminum is stretched in the process of grinding, the diameter thickness ratio is increasing, and the hiding power is also increasing.

2. Shielding characteristics of aluminum powder:

    The aluminum powder dispersed in the carrier floats, and the result of its movement is always that the substrate that can be coated by the carrier is parallel, forming a continuous aluminum powder layer, and this aluminum powder layer is arranged in parallel in multiple layers in the carrier film. The pores between each layer of aluminum powder are staggered, cutting off the capillary pores of the carrier membrane, and the external water and gas cannot pass through the capillary pores to reach the substrate, which is characterized by good physical shielding of aluminum powder.

    Aluminum silver powder used in powder coatings is divided into floating, non floating, mirror, flash, etc. It is generally understood that non floating type is aluminum powder with surface treatment. The smaller the particle size of silver powder is, the stronger the metal feeling is, and the stronger the covering power is; Too large amount of additive is easy to cause powder spitting and gun head blockage; When the addition amount is not enough, it is easy to appear black spots, hair flowers or small stripes.