How to Improve the Adhesion of Polyurethane Furniture Topcoat?

In the coating practice of polyurethane paint, it is found that when using water-based putty or colloidal putty as a primer, and then closing it with shellac paint, the adhesion of the polyurethane paint film is not satisfactory, peeling and foaming are serious, and the heat resistance is also poor. . The thicker the shellac primer, the poorer the adhesion of the polyurethane varnish film. At present, my country has begun to develop primers for polyester topcoats. For example, the 82o polyurethane resin primer (also known as color paste) developed by Shanghai Furniture Coatings Factory in 1981 has been used for several years to prove that the color paint prepared with it has low toxicity and good sealing performance, which is comparable to polyurethane topcoat. Advantages of strong combination. The resin color paste is used for coloring, and multiple processes such as coloring, filling putty and primer can be completed at one time. After the topcoat is applied on the color paste layer, the wood texture is clear, bright and three-dimensional. After testing, the physical and chemical properties of the paint film, such as heat resistance, light resistance and adhesion, are better than other primer methods. The putty used in the traditional method needs to be prepared and used immediately, while the color paste putty can be stored for a long time. Coloring with color paste can ensure the color consistency of the suit furniture painted in different periods. Color paste putty can also be sold as a commodity to solve the difficulty that some units make their own putty to achieve consistent color. Therefore, the application of resin color paste coloring method brings convenience to furniture painting.