1) Characteristics of aluminum powder, Aluminum is a silver-gray metal, which is relatively divided and suitable for pigment aluminum powder. Aluminum powder paste is a mixture of pigment aluminum powder and solvent. Its uses and characteristics are roughly the same as aluminum powder. Due to the mass of 26.98, the relative density of 2.55, the purity of 99.5%, the melting point of aluminum is 685 degrees, the boiling point is 2065 degrees, and the latent heat of fusion is 323kj/g , Aluminum has reducibility and is easy to oxidize, exothermic during the oxidation process. During rapid oxidation, the heat is 15.5 kj/g per gram. Aluminum is a ductile metal and easy to process. The oxide film on the surface of aluminum metal is transparent and has good chemical stability. The aluminum powder used for pigments means that the particles are in the form of flake, and the surface coating treatment is easy to use, so the output and dosage are larger.

(2) Compared with other pigments, aluminum powder for pigments has more characteristics, which are expressed in the following aspects: 1. The characteristics of scaly covering aluminum powder particles are scaly, and the ratio of the diameter of the flake to the thickness is about (40: 1)-(100:1), the aluminum powder is dispersed in the carrier and has the characteristic of being parallel to the substrate. A large number of aluminum powders are connected to each other, and small and large particles fill each other to form a continuous metal film, which covers the substrate and reflects outside the coating film. Light, this is the unique hiding power of aluminum powder. The hiding power of aluminum powder depends on the surface area, that is, the ratio of diameter to thickness. Aluminum is extended during the grinding process, the diameter-to-thickness ratio continues to increase, and the hiding power also increases. 2. The shielding characteristics of aluminum powder The aluminum powder dispersed in the carrier floats. The result of its movement is always to make itself parallel to the substrate coated by the carrier to form a continuous layer of aluminum powder. Multiple layers in the carrier film are arranged in parallel. The pores between the layers of aluminum powder are staggered from each other, and the capillary pores of the carrier film are cut off. External moisture and gas cannot penetrate the capillary pores to reach the substrate. This feature is the good physical shielding property of aluminum powder. 3. The characteristics of aluminum powder reflecting light Xuyang aluminum powder is made of aluminum with light color and high metallic luster. Its surface is smooth and can reflect 60%-90% of visible light, ultraviolet light and infrared light. Painted objects, the surface is silver and white. 4. "Dual-color effect" characteristics of aluminum powder Aluminum powder has the characteristics of metallic luster and parallel to the object to be coated. In the carrier containing transparent pigments, the gloss and color depth of aluminum powder vary with the incident angle and viewing angle of the incident light Changes occur in light and color, and this characteristic is called the "dual color effect." The aluminum powder is arranged in different layers in the coating film. When the incident light is irradiated to each layer of aluminum flakes, the reflected light is obviously different in brightness due to the different attenuation of the coating film of different thickness. When light enters the film layer containing transparent pigments and aluminum powder, the incident light passes through the pigment particles to become colored light, and then reflects through different levels of aluminum powder, changes in color tone and metal light will occur, incident light and viewing angle The angular position shifts gradually from the vertical, and the light passes through pigments of different particle amounts and aluminum powder of different particle sizes, and the hue and metallic light of the reflected light also change endlessly. This characteristic of aluminum powder has been widely used in paint as a hammer paint or metallic paint. 5. Floating characteristics of aluminum powder A large variety of aluminum powder and aluminum paste for pigments are floating type, which is characterized by scales floating on the surface of the coating film.

SAT NANO can supply the flake aluminum powder for pigment, 1-10um particle size, 99.5% purity, good quality, low price, fast delivery, if you have any interesting, please feel free to contact us at admin@satnano.com