How to improve the adhesion of water-based baking varnish resin? How to improve?

water-based paint resin is a widely used water-based resin, in the ink, paint and adhesive industry has a very wide range of applications. However, compared with oily products, water-based paint resins still have problems such as poor water resistance, poor wettability, and poor adhesion. How to improve the adhesion, especially the coating products based on one-component water-based baking paint resin, is the most concerned problem of industry engineers.

The adhesion of coating products based on water-based baking paint resin is mainly affected by the surface properties of the substrate, the quality of the coating film, the wetting ability of the coating, the adjustment of the film thickness and so on. Therefore, how to improve the adhesion is mainly adjusted from the above three aspects.

methods of improving adhesion:

1. Substrate surface treatment

first to ensure that the substrate surface without oil, clean. Dirty surfaces can seriously affect adhesion. Secondly, for smooth substrates that are difficult to adhere, surface treatments such as sandblasting, corona, primer, and flame are required to obtain porous, rough, and multifunctional surface substrates.

2. Improve the film-forming performance of the coating

coatings directly affect the adhesion. Need to adjust the type and amount of film-forming additives, control the length of film-forming time, etc., in order to achieve the best density of the film, good film-forming can bring lasting effect. Adhesion.

3. Improve coating wetting performance

the surface tension of water-based coatings is relatively large, there is no way to spread the adhesion on the substrate with low surface tension, which seriously affects the improvement of adhesion. According to the coating construction process, the selection of economical and applicable wetting agent is one of the effective ways to improve the adhesion.

4. Control coating dry film thickness

adhesion is inversely proportional to film thickness. Too thick paint film will not only cause waste, but also reduce the adhesion of the coating.

If the ideal bonding strength is still not achieved after the above adjustments, it proves that your base resin has exerted its maximum performance on such substrates. At this time should consider the introduction of some adhesion promoters to improve adhesion.