Flake aluminum powder is also known as aluminum powder pigment. Aluminum powder pigment is one of the important metal pigments. It is a high-purity (99.3%~99.97%) metal aluminum as raw material, which is produced by wet ball milling process. Compared with other pigments, aluminum powder pigments have their unique performance characteristics.

Characteristics of flake aluminum powder


1) Covering characteristics
The flake pigment aluminum powder has a diameter-to-thickness ratio (diameter to thickness ratio) of 40 to 220, which is parallel to the substrate after being dispersed in the carrier. A large number of flake aluminum powder pigments are connected to 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 coating film. This is the unique hiding power of flake aluminum powder pigments. The hiding power of flake aluminum powder pigment depends on the surface area and the ratio of diameter to thickness.

2) Shielding characteristics
The flake-shaped aluminum powder pigment dispersed in the carrier floats, and as a result of its movement, it always makes itself parallel to the substrate coated by the carrier to form a continuous aluminum powder layer, and this aluminum powder layer is in the carrier film Arranged in multiple layers in parallel. The pores of each layer of aluminum powder are staggered from each other, and the capillary pores of the carrier film are cut off. It is difficult for external moisture and gas to pass through the capillary pores to reach the substrate. This characteristic is the good physical shielding property of the flake aluminum powder pigment.

3) Two-color effect
The flake aluminum powder pigment has the characteristics of metallic luster and parallel coating. In the carrier containing the transparent pigment, the gloss and color depth of the flake aluminum powder pigment occur with the change of the incident angle and viewing angle of the incident light. This change is called "dual color effect".

4) Floating characteristics
A large category of pigmented aluminum powder is floating pigmented aluminum powder, which is characterized by flakes that can float on the surface of the carrier. The oxide film on the surface of the aluminum scales is hydrophilic, so it can make the carboxyl groups of fatty acids adsorb on the aluminum surface and the lipophilic ends outward, and another layer of lipophilic groups of fatty acids is connected with the lipophilic groups of inner fatty acids The carboxyl group is outward, so that each piece of aluminum powder is oleophobic after being coated with fatty acid, and will not be infiltrated in the oily paint carrier. The coating of fatty acids also reduces the weight of aluminum flakes.

5) Metallic gloss characteristics
The metallic luster effect refers to the specular reflection of light on the surface of the pigment. This effect will be weakened as the scattering of light on the edge of the pigment increases. The aluminum powder pigment has a "metallic flash effect", that is, the specular reflection of light on the surface makes the human eye feel a flicker. Metallic flash topcoat is the use of aluminum powder pigment with metallic luster, so that the coating has a metallic effect and a flashing effect of changing the brightness and darkness at different viewing angles.

6) Optical characteristics
The flake aluminum powder pigment is made of light-colored aluminum with high metallic luster. Its surface is smooth and can reflect 60~90% of visible light and ultraviolet light, and its ability to reflect light increases as the surface area increases. The object is coated with paint containing flake aluminum powder pigment, and its surface is silvery white, which is the characteristic of aluminum powder to reflect light.


7) Suspension
A new type of aluminum powder pigment is suspended aluminum silver paste. It is different from floating aluminum paste and non-floating aluminum paste. Its aluminum scales do not float on the surface of the film-forming object, nor sink on its bottom layer, but are suspended in the middle of the film-forming object. The aluminum flakes on the outer layer are protected from the outside by the film-forming material, so as to avoid the destruction of chemical and mechanical forces. This is good for painting objects that can often be touched by hand, and is also suitable for silver ink, which will not be wiped off by being touched. The distribution of aluminum scales in the film at multiple levels and different positions makes the "two-color effect" more prominent and more brilliant.

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