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Views: 2 Author: Site Editor Publish Time: 2022-12-02 Origin: Site
Aluminum powder, a silver metallic pigment, pure aluminum foil with a small amount of lubricant, mashed and crushed into a scaly powder, and then polished. Aluminum powder light weight, high floating force, strong hiding power, light and heat reflection performance are good. After treatment, it can also become non - floating aluminum powder. Aluminum powder can be used to authenticate fingerprints and make fireworks. Aluminum powder is a major category of metal pigments because of its wide use, large demand and many varieties.
No smell. Silver-white metal powder, spontaneous combustion temperature: 5900℃, dust lower explosive limit: 40mg/m3. Do not contact dilute acid or strong base. A lot of dust will heat up naturally when it gets wet. The mixture of aluminum powder and other metal oxides will react violently or catch fire. Mixing with halogen elements will cause fire. Explosive reactions occur when heated or rubbed with halogenated hydrocarbons.
Aluminum is a silver-gray metal with a relative density of 2.55 and a purity of 99.5%. The melting point of aluminum is 685 degrees, the boiling point is 2065 degrees, and the melting endothermic heat is 323kJ/g. Aluminum is reductive, easy to oxidize and exothermic in the oxidation process. The heat release of 15.5kJg per gram at rapid oxidation, aluminum is ductile metal, easy to work. The oxide film on the surface of aluminum is transparent and has good chemical stability.
The aluminum powder used for pigment refers to the aluminum powder whose particles are flaky and coated with treatment agent. Aluminum slurry is a mixture of pigment aluminum powder and solvent, its use and characteristics are roughly the same as aluminum powder, because it is easy to use, so the output and dosage is larger. Compared with other pigments, aluminum powder for pigment has more characteristics in the following aspects:
1. the characteristics of the scaly cover
Aluminum powder particles are scaly, the slice diameter and thickness ratio is about (40:1)-(100:1), aluminum powder dispersed to the carrier has the characteristics of parallel with the substrate, a large number of aluminum powder connected to each other, the size of the particles fill each other to form a continuous metal film, covering the substrate, and reflect the light outside the film, this is the unique covering power of aluminum powder. The covering power of aluminum powder depends on the small surface area, that is, the ratio of diameter to thickness. Aluminum is extended during the grinding process, increasing the diameter to thickness ratio and increasing the covering power.
2. Shielding characteristics of aluminum powder
The aluminum powder dispersed in the carrier floats, and the result of its movement always makes itself parallel to the substrate coated by the carrier, forming a continuous aluminum powder layer, and the aluminum powder layer in the carrier film multilayer parallel arrangement. The pores between the layers of aluminum powder stagger each other, cutting off the carrier film capillary pores, the outside of the water, gas can not reach the bottom material through the pores, this feature is good physical shielding aluminum powder.
3. Optical properties of aluminum powder
Aluminum powder is made of light color, high metallic luster aluminum, its surface is smooth, can reflect visible light, ultraviolet light and infrared light of 60% to 90%, with the coating containing aluminum powder coating objects, the surface is silver and bright, this is the characteristics of aluminum powder reflected light.
4. Aluminum powder "two-color effect" characteristics
Because aluminum powder has the characteristics of metallic luster and parallel to the coated object, in the carrier containing transparent pigment, the gloss and color intensity of aluminum powder change with the incident Angle and Angle of view of the incident light, which is called "two-color effect". The aluminum powder is arranged in different layers in the coating film. When the incident light illuminates each layer of aluminum scales, the reflected light is obviously of different brightness because it is weakened by different thickness of the coating film. When the light enters the film containing transparent pigment and aluminum powder, the incident light becomes colored light through the pigment particles, and then reflects out through different layers of aluminum powder. The changes of tone and metal light will occur. The incident light and Angle of view will gradually shift from vertical to vertical, and the light will pass through the pigment with different particle numbers and aluminum powder with different particle sizes. The reflected light varies infinitely in hue and metallic glow. This property of aluminum powder has been widely used in paint, as hammer paint or metallic paint.
5. Floating characteristics of aluminum powder
One type of aluminum powder and aluminum paste used for pigment is the floating type, which is characterized by a flake floating on the surface of the coating film.
1. Aluminum powder application range: powder coating, ink, plastic masterbatch, printing, imitation gold paper, imitation gold card, gold film, textiles, but in water paint and acid and alkali paint will be oxidized black. Aluminum powder can be used to authenticate fingerprints and make fireworks.
2. Because aluminum powder has the characteristics of metallic luster and parallel to the coated object, in the carrier containing transparent pigment, the glossiness and color intensity of aluminum powder change with the incident Angle and Angle of view of the incident light, which is called "two-color effect".
3. Aluminum powder is arranged in different layers in the coating film. When the incident light irradiates to each layer of aluminum scales, the reflected light is obviously of different brightness because it is weakened differently through the coating film of different thickness. When the light is injected into the film containing transparent pigment and aluminum powder, the incident light passes through the pigment particles into colored light, and then reflected out through different layers of aluminum powder, there will be changes in tone and metallic light.
4, the incident light and Angle of view from the vertical gradually angular displacement, light through different particle number of pigment and aluminum powder of different particle sizes, reflected light color and metal light also infinite changes. This property of aluminum powder has been widely used in paint, as hammer paint or metallic paint.
Aluminum powder can be divided into pure aluminum and aluminum powder. The main ones are as follows:
1. Extra fine aluminum powder: The raw material is pure aluminum ingot.
Main uses: Mainly used for aerospace industry rocket propulsion fuel, but also used for the first raw material military explosives.
2. Ultra-fine aluminum powder: The raw material is pure aluminum ingot.
Main Application: Used as raw material of metal paint for high-grade automobile, mobile phone, motorcycle and bicycle.
3. Steelmaking aluminum powder: can use waste aluminum production.
Main Application: steel degassing, deoxidation.
4. Fine aluminum powder: particle size 0.35~0.
Main applications: Chemical industry, fireworks, etc.
5. Ball milling aluminum powder: particle size 0.08~0.
Main applications: Chemical industry, casting, fireworks
6. Coating aluminum powder
Mainly used for industrial anticorrosion, rust and melt coating, the production of fireworks and firecrackers. Ordinary coating aluminum powder can be produced from waste wire of high grade.
7. Aluminum magnesium alloy powder
Main applications: fireworks, firecrackers, military explosives
8. Fireworks aluminum magnesium powder: can use waste aluminum production.
Main use: Fireworks powder
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