Coating method of composite film

Abstract

The invention relates to a coating method of a composite film, the composite film comprises a base film and a coating layer, the coating layer is prepared from a coating paint, the coating paint comprises a bi-component polyurethane paint and a polyester polyol dispersoid, and the coating method comprises the following steps: step 1, coating, step 2, curing, and step 3, drying. The coating has the advantages that the coating is prepared from the isocyanate prepolymer, the hydroxyl resin and the polyester polyol dispersion, and the solid content of the coating is high, so that the cross-linking reaction between the resins can be completed only by coating once, the mold pressing requirement is met, the production efficiency is greatly improved, and the production cost is reduced. In addition, the resin and the curing agent in the coating paint are separated, so that the coating paint can be cured in a normal temperature state to generate a cross-linking reaction, then, the whole coating paint is high in coating flatness, free of the leveling problem of coating orange peel and excellent in film forming performance, and the problems of mold pressing plate blockage and plate sticking are well solved.

Description

technical field [0001] The invention relates to a coating method of a composite membrane. Background technique [0002] The original composite coating is mainly one-component coating, the main components are dioctyl phthalate, aromatic isocyanate, aromatic isocyanate, carbamate, toluene diisocyanate, water-soluble polyurethane polypropylene glycol, ethylenediamine, toluene Diisocyanate, the coating needs to be coated twice to complete the film formation during production, and the curing reaction needs to be completed under high temperature conditions, which seriously affects the production efficiency. Contents of the invention [0003] The object to be achieved by the present invention is to provide a coating method for a composite film, which can realize the cross-linking reaction between resins only by coating once, and greatly improves the production efficiency. [0004] In order to solve the above-mentioned technical problems, the present invention is achieved through...