Yuan Lei's Little Knowledge | The Role of Barium Sulfate in Powder Rate of Powder Coatings

Release time:

2024-01-29 09:34


1. control the powder particle size distribution, the narrower the better: reasonable control of powder particle size (more difficult), in our actual production only adjust the ACM main and auxiliary mill speed. Powder particle size is important 40-50UM is appropriate, the distribution of about narrow the better.

2. increase resin content: increase resin content, reduce filler content, select resin with good charging performance, epoxy is better to powder, polyester is not powdered by some manufacturers, polyester is more difficult to powder by some manufacturers (epoxy and polyester are ground into powder spray board separately), the leveling sprayed by friction spray gun is obviously better than that of electrostatic spray gun, and friction spray gun can spray thicker coating, and the coating does not have the disadvantages of high pressure gun, such as large orange peel.

3. and reasonable selection of fillers: filler fineness and dispersion are closely related to the powder. Precipitation on the powder is higher than the general ultrafine heavy barium, barium sulfate is better than calcium carbonate.

4. increase the charge aid: add the appropriate amount of conductive aid in the formula (mechanism of action: can make the powder particles carry more charge. There is a strong electric field in the area from the high-voltage electrostatic spray gun to the workpiece, and the air is ionized to produce hundreds of millions of ions. When the powder particles of the electric booster pass through this area, they are polarized, which can trap more negative ions and carry more charge. For the groove dead angle and other parts due to the weak power line of the Faraday effect, the powder particles with more charge can reach the surface of the workpiece by their own strength, thus improving the powder on these parts.

Barium sulfate, powder, resin, polyester, filler, more, charge, particle, improve, better

Yuan Lei's Little Knowledge | Performance Requirements and Types of Fillers for Coatings


Fillers in coatings are usually white or slightly colored pigments with a refractive index less than 1.7. It has the basic physical and chemical properties of pigments used in coatings, but due to its refractive index being similar to the film-forming material, it is transparent in coatings and does not have the coloring and covering power of coloring pigments. It is an indispensable pigment in coatings.

Yuan Lei's Little Knowledge | Application Effects of Different Mineral Powder Materials in Coatings


In architectural coatings, commonly used mineral materials include barium sulfate, calcium carbonate, kaolin, mica powder, talc powder, quartz powder, silica micro powder, transparent powder, glass powder, wollastonite powder, etc. Reasonable application of various mineral materials can effectively improve or enhance the performance of coatings. Let's take a look at the application of different mineral materials in coatings.

Yuan Lei's Little Knowledge | Characteristics of Mineral Materials


Mineral materials refer to the material products obtained by processing and transforming natural minerals (mainly non-metallic minerals) or rocks as the main raw materials, or minerals or rocks that can be directly used as materials and aim to utilize their main physical and chemical properties. This meaning mainly includes the following four aspects: first, natural minerals and rocks that can be directly utilized or processed to be utilized; Secondly, finished or semi-finished materials made mainly from natural non-metallic minerals and rocks through physical and chemical reactions; Thirdly, artificially synthesized minerals or rocks; Fourthly, the direct utilization targets of these materials are mainly their own physical or chemical properties, not limited to individual chemical elements.