Coating is mainly composed of resin, pigment and filler, additives and solvent mixture system. Very common in life, can be said to be everywhere. Furniture and home appliances surface will use paint, walking tools whether it is riding a bicycle or a car to use paint, toys, musical instruments, plastic products, the use of paint is too extensive, so you are not curious about what are added to the paint filler?
In the coating industry, the filler mainly plays a role in two aspects:
Physical and chemical properties of some fillers
Calcium carbonate is used in chemical building materials and has the characteristics of heat resistance, chemical corrosion resistance, cold resistance, sound insulation, shockproof and easy processing. In oily coatings, calcium carbonate is used as a filler and can play a skeleton role.
According to the different production process of calcium carbonate, it is mainly divided into natural calcium carbonate and synthetic calcium carbonate. High-quality natural calcium carbonate products are based on calcite as raw material, high whiteness, can be made into a variety of mesh required for coating powder. Synthetic calcium carbonate should not be shared with pigments with poor alkali resistance. It can be used as a filler for water-based interior wall coatings in architectural coatings, but it is rarely used for exterior wall coatings due to poor weather resistance and color retention.
In the field of industrial coatings, especially in the primer, the introduction of talcum powder can improve the corrosion resistance and crack resistance of the coating film, and can improve the adhesion and sanding, but also play a role in anti-sinking and anti-hanging.
The horizontal arrangement of mica powder in the coating can prevent ultraviolet radiation and protect the coating film, but also to prevent moisture penetration. In architectural coatings, the introduction of mica powder can improve the crack resistance of the coating and improve the scrub resistance. A small amount of mica as a special component of the steel structure primer can improve the salt spray resistance and durability.
Kaolin has good anti-settling effect, good dispersion and suspension performance in the coating, and makes the coating have good leveling, scrub resistance and weather resistance. Kaolin can provide the structural viscosity of the coating, which is beneficial for sag resistance and storage stability, and can also be used to enhance the hiding power of the coating film.
Barium sulfate includes natural barite powder and precipitated barium sulfate in two forms. The barite powder is mainly used in the primer in the coating industry. It can be made into a thick film primer by using its low oil absorption and low paint consumption. And filling, leveling and anti-penetration is good, can increase the hardness and wear resistance of the coating film. Generally speaking, the performance of precipitated barium sulfate is better than that of natural products. It has high whiteness, fine texture and anti-blooming. The disadvantage is that it has high density and is prone to precipitation.
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