The extinction principle and extinction method of coatings

2022-04-01   Pageview:37

With the continuous improvement of people’s living standards, the demand for low-gloss coatings with a soft appearance has increased dramatically. At the same time, it also makes how to produce coatings with matting properties a problem that coating designers must consider.

The principle of extinction
The principle of physical matting is: adding matting agent to make the coating surface uneven during the film-forming process, increasing the scattering of light and reducing reflection. Chemical matting is achieved by introducing some light-absorbing structures or groups such as polypropylene grafts into the coating to obtain low gloss.

extinction method
Matting agent
Metal soap is a commonly used matting agent in the early days. It is mainly some metal stearate, such as aluminum stearate, zinc stearate, calcium stearate, magnesium stearate, etc., among which aluminum stearate. most applied.

wax
Wax is an organic suspension type matting agent. After the coating is applied, with the volatilization of the solvent, the wax in the coating film is precipitated and suspended on the surface of the coating film as fine crystals, forming a rough surface that scatters light and plays a matting effect.

Functional fines
Such as diatomite, kaolin, fumed silica, etc. are all functional fine materials specially used as matting agents, which belong to inorganic filled matting agents. As the coating dries, their tiny particles form a micro-rough surface on the surface of the coating, reducing the reflection of light for a matte appearance.

Matt resin
Resin is an indispensable component of coatings, so some people have synthesized resin for matting, and use it and other resins to form a film to obtain low gloss, which can avoid the use of matting agents and reduce the cost of coatings.

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