Powder coating adhesion promoter into the cause of environmental protection

China Coatings Network
News: It is understood that ultraviolet curing
coatings
compared with traditional coatings, does not contain any organic solvents or inert thinners, curing without heating, with less environmental pollution, low energy consumption, high efficiency, good chemical stability, good applicability and so on, is an energy-efficient and environmentally friendly modern coating, has been widely used in various fields. With the development and application of various photosensitive coatings, one of the keys to the formulation design of UV-cured coatings is how to improve their adhesion with various substrates, because good adhesion is the prerequisite for coating film to obtain good processing performance, media resistance and outdoor weather resistance. Therefore, how to improve the properties of coating film by improving the adhesion of coating is our concern. In general, it is possible to improve
by adding a variety
powder coatings and other adhesion promoters. The selection of suitable adhesion promoter enhances the effective contact between the coating film and the substrate, and obtains good adhesion and comprehensive performance by using the adhesion promoter with active function group to form a strong chemical bonding on the surface of the substrate. Because the promoter of this institute is a composite product with CC single-official and dual-official groups, it can better cope with the problems of volume shrinkage and in-shrink stress when light curing.
In order to solve the problem of poor adhesion of UV-cured coatings, a powder coating adhesion promoter of phosphoric acid groups that can be cured by ultraviolet light is made by hydroelectric addition reaction with acrylic ethyl acrylic or methyl acrylates and phosphorus phosphate as raw materials under certain conditions. The acid value tracking test was used to determine the total reaction time of 3.5h. Infrared spectral analysis of the product indicates that the hydroxyl in the reaction has been fully reacted and the formation of phosphate group and CC double bonds in the product. Comparing the performance of homemade products and commercially available products on different sheets, the results show that these two products have a good attachment promotion effect on UV curing coatings and polar substrates such as metal, glass and wood, and determine the advantages of homemade products.