Good Silicon Dioxide Powder For Glossy Photo Paper

What factors should be considered when choosing matting powder?

There are many brands of matting powder on the market, and each type of matting powder has a specific application field and effect. In

practical applications, various matting agents have strong selectivity for polyester resins. This selectivity refers to the use of the same

Matting Agent with different types of polyester to obtain different matting effects and performances.

Depending on the purpose of the matting powder, semi-gloss or matte powder coatings are sometimes required. In order to reduce the

gloss of the coating film, commonly used matting agents include ultrafine silica, talcum powder, aluminum stearate, calcium stearate, low

molecular thermoplastic resin, etc. To obtain the matting effect, the following methods can be used:

Powder coatings with different curing speeds are mixed by dry mixing, and the gloss of the resulting coating film is significantly reduced,

which plays a matting role. Because the powder coating with high reaction activity cures quickly, the leveling and reaction of the slower

curing resin in the continuous phase are hindered, and the cured coating film loses its gloss. Although this method is effective, it increases

the manufacturing process and cost.

Matting powder efficiency and coating surface state. The choice of matting agent is determined by the thickness of the dry film of the coating.

The particle size and the coating thickness must be well matched to achieve a satisfactory balance between matting efficiency and surface

smoothness. Among matting agent products with the same pore volume, the matting agent with a larger particle size generally has a higher

matting efficiency, but it will also cause the coating surface to be rougher. A matting agent variety that can match the required coating roughness

should be selected according to the fineness value of the matting agent. In addition, the refractive index of the matting agent should be as close

as possible to the refractive index of the fluororesin (1.4-1.6), so that the matting fluorocarbon varnish prepared in this way is transparent and

has no white fog, and the color of the fluorocarbon color paint will not be affected. The wear resistance and scratch resistance of the fluorocarbon

coating surface should also be considered. The particle size and distribution of the matting powder have a great influence on the wear resistance

and scratch resistance of the coating surface. Special attention should be paid to not allowing large particles larger than 25μm.

* Methods for distinguishing the quality of matting powder

There are two key points to identify the quality of matting powder. First, look at the appearance. High-quality profiles have uniform dimensions, reasonable

inner cavity structure, soft color, smooth protective film, no bubbles, and the wall thickness is generally 2 mm. Second, look at the anti-counterfeiting code.

The side of the genuine plastic steel profile is printed with an anti-counterfeiting code consisting of 20 Arabic numerals in dotted form. The numbers are

clear and easy to identify, without duplication, and not easy to erase. The numbers of inferior matte powder spray codes are blurred, easy to erase, and

the numbers are often repeated.

Anticorrosion Pigments, Inkjet Receptive Coating, Matting Agent