Yuan Lei's Little Knowledge | Method of Improving Coating Gloss with High Gloss Barium Sulfate

Release time:

2024-01-29 09:34

High-gloss barium sulfate is barite ore, processed by beneficiation, ore washing, crushing and other processes. Moderate hardness, brittle, stable chemical properties, insoluble in water, ethanol and hydrochloric acid, acid and alkali resistance and water resistance.

The main characteristics of high gloss barium sulfate are good dispersion, high whiteness and good leveling. It has excellent light resistance, weather resistance and acid resistance, good chemical inertness and moderate surface energy, making it a functional filler with good dispersion and affinity with other media. And with all the pigment has good compatibility, can replace part of the precipitated barium sulfate, titanium dioxide, active silica and other high-priced raw materials, reduce costs. It is an environmentally friendly material that can absorb harmful rays and works well in powder coatings.



The main purpose of high gloss barium sulfate

1, plastic

Applied in plastics, it has good dispersion, can enhance the hardness and rigidity of plastics, maintain the surface gloss and brightness of plastics, and is especially suitable for the manufacture of high-gloss PP and nylon parts for home appliance shells.

2. Coating

Application in the coating, the product and titanium dioxide according to a certain proportion of the use of at the same time, can make titanium dioxide more effectively play its cover performance, reduce the amount of titanium dioxide, especially suitable for automotive paint, high-grade exterior wall coatings. At the same time, there is a significant improvement in anti-chalking performance.

3. Powder coating

Applied to powder coatings, powder coatings can enhance the leveling and gloss retention, and have good compatibility with all the pigments, can improve the powder coating in the spraying process to achieve the most ideal film thickness, improve the powder rate, reduce the amount of powder coating, powder coating on the grade of the required products.

The fineness of barium sulfate used in coatings and paints is generally 325 mesh, 800 mesh, and more 1250 purposes. Especially in the coating requirements are relatively fine, most of the use of 1250 purposes. Under normal circumstances, barium sulfate will be crushed to 1-8μm particle size, applied to latex paint can replace part of titanium dioxide, and whiteness and hiding power did not decline. This is because although the crushed barium sulfate is very fine, it is still a medium-sized particle composed of agglomerated agglomerates, because when barium sulfate is formed, its crystal size is between 0.2 and 0.8μm, and the gap between these agglomerated particles is too small, so that the dispersed resin cannot enter the agglomerates. As a result, when the film is dried, these tiny air gaps are maintained, it is present in the form of air, thereby increasing the refractive difference between the components.

In some coatings, such as electrostatic spraying, we need is gloss, as long as the gloss can be done, the effect of the coating is obvious. Therefore, the requirement for barium sulfate is to improve the gloss of the coating.

Method, barium sulfate, powder coating, coating, titanium dioxide, use, gloss, improve, crush, plastic

Yuanlei Classroom | As a key material, how many applications does precipitated barium sulfate have?


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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