Yuan Lei's Little Knowledge | Which Coating (III) Are Different Mineral Powders Suitable

Release time:

2024-01-29 09:34

Non-metallic minerals are mainly used as functional fillers in the coatings industry. The purpose is to reduce the cost of coatings; increase the consistency of latex paint, improve the suspension of pigments in the paint; give coatings functionality and improve their properties, including gloss, hiding Power, flow and homogenization, durability, film thickness, penetration and rheology.

There are many kinds of mineral fillers and their performance varies greatly. Therefore, it is the key for non-metallic mineral powder manufacturers to open the coating market to thoroughly understand the performance and best application of mineral fillers.



1. high solid coating

Generally, coatings with 55% solids can be called high-solids coatings, and their main requirements for pigments and fillers are: under normal shear stress, they have little effect on the binder.

In the high solid coating, the connecting network of the coating film is relatively fragile and the viscosity is poor. Due to the absorption of moisture, in order to avoid loss of adhesion, weakening of the inherent corrosion resistance and foaming, the surface of the filler must be hydrophilic, with a small surface area and a flake shape.

(1) Talc

Talc is a microcrystalline mineral with small surface area, which is suitable for high solid protection and marine coatings. Due to the good barrier effect of talc, its traditional use is in industry and ship maintenance. Although the high oil absorption of talc increases the viscosity of the coating, talc can still be used in high-set coatings by strictly controlling the particle size.

(2) Kaolin

Kaolin with low oil absorption can be well used in high-solid coatings, which is beneficial to improve the viscosity stability of the coating, enhance the anti-cracking mechanical force and erosion resistance, and can be used to prepare high gloss and high smoothness topcoat.

(3) barite and barium sulfate

When high gloss and strong wear resistance are required, barite is often used as a filler for high-solid coatings, such as high-solid industrial topcoats. 0.7-0.8μm micro-powder grade precipitated barium sulfate is used for high-solid finish, which can reduce VOC and replace some expensive titanium dioxide.



2. radiation treatment coating

Most conventional fillers can be used in radiation treatment coatings. The type and amount of minerals ultimately depends on the requirements of the finished product.

For example, in radiation-treated coatings applied to the surface of wood materials, fillers are generally used in an amount of 10-40% in order to obtain good wear and corrosion resistance. Under normal circumstances, the selection of minerals with low refractive index can minimize the influence of fillers on the treatment effect. Now, the improvement of the lighting system has allowed the radiation treatment of colored coatings, and the ability of minerals to absorb the ultraviolet spectrum (such as talc, kaolin, mica) should also be fully considered in the selection of fillers.

Barite is used in radiation treatment coatings to play the role of sand doping, talc as filler in order to obtain a high smooth surface of the primer, and the use of different particle size of calcium carbonate, both as a filler and can reduce costs, silica can be used as a matting agent.


Suitable for, coatings, fillers, minerals, talc, treatment, materials, radiation, for, capacity.

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The appearance of precipitated barium sulfate is a white amorphous powder, with a relative density of 4.50 (15 ℃) and a melting point of 1580 ℃. Due to its high refractive index (1.63-1.65), it exhibits a relatively white color and a certain degree of covering power. It is almost insoluble in water, ethanol, and acid, soluble in hot sulfuric acid. It is easy to form mixed crystals with potassium permanganate, calcium carbonate, or metal nitrates, and can be reduced to barium sulfide with carbon at high temperatures.

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Wet mica powder is a high-quality mineral filler made from high-quality mica raw materials, which are washed, impurity removed, soaked, crushed, low-temperature dried, and screened. Its unique production process maximizes the preservation of mica's sheet-like structure, large diameter to thickness ratio, high refractive index, high purity, high whiteness, high gloss, low sand and iron content, and other industrial characteristics that cannot be compared to dry process technology. The unique performance of wet mica powder has greatly improved its application in multiple industries such as plastics, paint, rubber, etc., and has a significant effect on improving product performance and reducing costs.

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