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Metallic Pigment-Aluminum Paste

June 26, 2021

Aluminum paste is an indispensable metallic pigment. Its main components are flake-like aluminum particles and petroleum solvent, which are paste-like. It has undergone special processing technology and surface treatment. Its characteristics are that the surface of the aluminum sheet is smooth and flat, the particle size distribution is concentrated, the shape is regular, and it has excellent light reflection ability and metallic luster. It is mixed with transparent color pigments, and the paint film has obvious "Angle effect", the decorative effect is very gorgeous and beautiful. Aluminum paste can be divided into two categories: floating type and non-leafing type. During the grinding process, one fatty acid is replaced by another, so that the aluminum paste has completely different characteristics and appearance. The aluminum flakes are shaped like snowflakes, fish scales and silver dollars.
In the leafing aluminum paste, the aluminum flakes are aligned near the surface of the paint film to form an opaque silver film. This opaque nature is the main factor that makes the leafing aluminum paste an important functional raw material. Leafing aluminum paste is generally used in roof coating, maintenance, and commercial application coatings that require high protection. The appearance of the leafing aluminum paste can vary according to the thickness of the particles, from a rough, white appearance to a dark, highly reflective or mirror-like effect. Coarse-grained floating aluminum paste has the lowest hiding power and rough structure, but it can obtain the whitest and brightest coating. On the contrary, the fine-grained leafing aluminum paste has the greatest hiding power, the smoothest structure and the high reflective coating.
The non-leafing aluminum paste is evenly distributed in the entire paint film. The appearance of the formed coating film is different from that of the floating aluminum paste. Because it can be mixed with various pigments and is suitable for various systems, it is suitable for industrial coatings. The outfit has a unique effect. However, any pigments or dyes used with non-leafing aluminum pastes must be transparent, only in this way can the effect of the realistic metal surface be achieved. There are many types of non-leafing aluminum pastes, coloring power from low to high, particle size from coarse to fine, appearance from white, shiny to grayer, more delicate, and acid-resistant products to reduce industrial smoke, acid rain and other defects The impact of the environment on the paint.
Aluminum paste is not easy to catch fire and explode. Covering power, brilliance, triggering performance, metal performance, and smoothness are the technical requirements for identifying aluminum paste. Aluminum paste models are classified according to the size of the particle size. Uses: widely used in plastic paint, hardware appliance paint, motorcycle paint, bicycle paint, etc. According to the list of chemical dangerous goods, aluminum paste belongs to the 33646 category: paints, auxiliary materials and coatings containing secondary flammable solvents. However, due to international and domestic requirements for the environmental protection and safety of chemical products in recent years, domestic manufacturers have changed their processes, instead of using secondary flammable solvents as carriers, but using safe and environmentally friendly solvents with higher flash points. The aluminum paste produced now is no longer in the scope of dangerous goods in terms of actual chemical properties.
Aluminum paste is mainly used in automotive coatings, weak plastic coatings, metal industrial coatings, marine coatings, heat-resistant coatings, coil coatings, etc. In the past two or three years, China's aluminum paste products have also begun to develop in the direction of using micro-spherical aluminum powder as raw materials, and major technological breakthroughs have been made. However, the performance indicators and coating effects of its products are still comparable to those of international counterparts. There is a certain gap between products.
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