Powder adhesion promoter enters the environmental protection industry

It is understood that compared with traditional coatings, UV cured coatings do not contain any organic solvents or inert diluents, and do not require heating during curing. They have the characteristics of low environmental pollution, low energy consumption, high efficiency, good chemical stability, and good applicability. It is an efficient, energy-saving, and environmentally friendly modern coating that has been widely used in various fields. With the development and application of various photosensitive coatings, one of the key factors in the formulation design of UV curable coatings is how to improve their adhesion to various substrates, because good adhesion is a prerequisite for the coating to achieve good processability, medium resistance, and outdoor weather resistance. Therefore, how to improve the performance of coatings by increasing their adhesion is a concern for us all. Generally speaking, the adhesion of powder coatings is improved by adding various adhesion promoters. Choosing appropriate adhesion promoters to enhance the effective contact between the coating and the substrate, and using adhesion promoters with active functional groups to form strengthening bonds with the substrate surface, can achieve good adhesion and comprehensive performance. Due to the fact that the promoter obtained in this study is a composite product with CC single functional group and bifunctional group, it can effectively address the volume shrinkage and internal stress issues during the UV curing process.

In order to solve the problem of poor adhesion of UV curable coatings, a UV curable powder coating adhesion promoter containing phosphate groups was prepared by electrophilic addition reaction of hydroxyethyl acrylate or 2-hydroxyethyl methacrylate with phosphorus pentoxide under certain conditions. The total reaction time was determined to be 3.5 hours through acid value tracking test. The infrared spectroscopy analysis of the product indicates that the hydroxyl groups in the reactant have completely reacted, and a double bond has been formed between the phosphate group in the product and CC. We compared the performance of self-made products and commercially available products on different circuit boards. The results indicate that these two products can promote the adhesion of UV cured coatings to polar substrates such as metal, glass, and wood, and determine the advantages of self-made products.