[Shanghai zinc stearate supply and procurement] Application and precautions of zinc stearate in various wood paints

Common types of wood paint on the market include nitrocellulose paint (NC paint) , PU paint, PE paint, UV paint and AC paint.

As a filler, zinc stearate is mainly used in wood primers. Its main functions are: improving the polishing properties of the primer; giving the primer a certain The thixotropy improves the dustproof properties of the primer and improves the filling properties of the primer.

The following suppliers of zinc stearate will introduce to you the application and precautions of zinc stearate in various wood paints:

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1. Application of zinc stearate in nitrocellulose paint:

Nitrocellulose The film-forming substances of the paint are mainly nitrocellulose (nitrocellulose) and alkyd resin. It is a self-drying paint, which is characterized by fast drying speed. Because of the large molecular weight of nitrocellulose and the low solid content of nitrocellulose paint, it is very sensitive to the powder. The wettability is poor. Therefore, the appropriate addition amount of zinc stearate in nitrocellulose paint is 0%-2%. If the addition amount is too large, it will affect the adhesion and transparency of the primer.

2. Application of zinc stearate in PU paint:

Film formation of PU paint The main substances are polyisocyanate (curing agent) and alkyd resin. The film is formed by the cross-linking reaction of -NCP of the curing agent and -OH of the alkyd resin. It is a cross-linked curing paint. PU paint has a high solid content, so it is suitable for powder materials. It has good wettability. Therefore, the appropriate addition amount of zinc stearate in PU primer is 2%-5%. If the addition amount is too large, it will affect the adhesion and transparency of the primer, and in severe cases, it will cause hair growth. white phenomenon.

3. Application of zinc stearate in PE paint:

Film formation of PE paint The main substances are unsaturated polyester (PE resin) and monomer cross-linking agent (styrene). It is a cross-linked curing paint. PE paint has high solid content and good hardness. Zinc stearate is a suitable addition to PE primer. The amount is 2%-5%. If the amount is too large, it will affect the adhesion and transparency of the primer, and in severe cases, it will cause whitening.

4. Application of zinc stearate in UV paint:

Film formation of UV paint The main substances are UV resin and monomer cross-linking agent, which are cured into a film by UV light irradiation. UV paint has high solid content and good hardness. Zinc stearate is easy to stabilize foam during UV primer construction, and has a greater impact on the adhesion of UV paint. Large, so zinc stearate is rarely used in UV paint.

5. Zinc stearate cannot be used in AC paint:

The composition of AC acid curing paint The membrane materials are mainly alkyd resin and urea-formaldehyde resin, which are cross-linked to form a film through the catalytic action of acid curing agent (mainly p-toluenesulfonic acid); p-toluenesulfonic acid is a strong acid and will decompose zinc stearate. Due to the reaction After part of the acid curing agent is consumed, the AC paint with zinc stearate will dry slowly or not at all.