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Relationship between oil absorption value and specific surface area of matting agent

October 30, 2019


One of the biggest effects of matting powder is Matting Agent, but the addition of matting agent can also change certain properties of the product system, such as system viscosity, viscosity and oil absorption. First, let's first understand the definition of the oil absorption value. The oil absorption value is a physical value indicating the relationship between the pigment powder and the chromophore. It not only illustrates the mixing ratio, the degree of wetting, and the dispersing property between the pigment and the color carrier, but also relates to the formulation of the coating and various properties after film formation. The oil absorption is related to the size and shape of the pigment particles, the degree of dispersion and cohesion, the specific surface area, and the surface properties of the pigment.
In water-based wood lacquer, water-based leather lacquer and other water-based paint inks, ordinary silica has a large oil absorption and serious thickening, which is not conducive to construction and film leveling, while organic matting powder has low oil absorption and good effect. The relationship between the specific surface area of the matting powder and the oil absorption value is that the larger the specific surface area is, the larger the oil absorption value is; the smaller the specific surface area is, the smaller the oil absorption value is, and the two are positively related. Therefore, when the buyer selects the matting powder, in addition to the extinction In addition to the indicators, the appropriate oil absorption value matting agent can be selected according to the viscosity requirements of the product.

Silica Powder 40 Jpg

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