Adhesion promoter of powder coating

Adhesion promoter is a new type resin adhesive promoter, it has special effects to coatings against peeling. Wide solubility can improve the adhesion of various coating systems such as waterborne coatings, inks, screen printing paste, UV varnish, PU varnish, plastic paint, metallic paint, it particularly suitable for water based paint, improve traction and toughness.

Features of the adhesion promoter are as follows: it has excellent adhesion to improve the surface of non-ferrous metals, such as aluminum, aluminum alloy, stainless steel, zinc plated surface, etc; it can improve ductility and impact resistance of the coating; it does not change color with urgent high temperature baking, and it does not affect the weather resistance of coating; it does not affect the storage stability of coatings. Adhesion promoter is widely used in a variety of chemical fiber, wood, plastic, metal, ceramic, glass, ABS, PVC and so on.

It is understood that compared with traditional coating, UV-curing coatings containing no organic solvents or inert diluents, it is no need heat when curing. Because of the less pollution, low energy consumption, high efficiency, good chemical stability characteristics, suitability, etc, it is an energy-efficient and environment-friendly modern paints and has been widely used in various fields.
With the development and application of photosensitive coatings, the key of UV-curable coatings formulation is to improve its adhesion to various substrates, because good adhesion is the premise for coating film to get a good processing properties and outdoor weatherability, chemical resistance properties. Proper adhesion promoter to enhance film effective contact with the substrate, using a reactive functional group adhesion promoter to form strong chemical bonds with the substrate surface to obtain good adhesion properties.

In order to solve the problem of poor adhesion of UV-curing coatings, hydroxyethyl methacrylate or methyl acrylate and phosphorus pentoxide as raw materials under certain conditions for electrophilic addition reaction to get UV-curing powder coatings adhesion promoter containing phosphate groups. Total reaction time determined by acid test is 3.5h. Infrared Spectral analysis of product show that the hydroxyl group in the reactant is completely reaction product as well as in the phosphate group and CC double bond formation. Comparison of homemade products and the products in the market of performance on a different sheet, the results showed that the two products have very good role in UV-curing coatings and metal, glass, wood and other polar substrates. Click here!