Anticorrosive polyurethane water-based paint and preparation method thereof

Abstract

The invention relates to an anticorrosive polyurethane water-based paint and a preparation method thereof. The preparation method comprises the following steps: synthesizing a modified polyurethane emulsion from amino-terminated graphene and a polyurethane prepolymer, and then preparing the water-based paint. According to the preparation method, graphene is modified, so the problem of non-uniform dispersion of graphene in a polymer emulsion is effectively solved, and an amino-terminated polyether chain is grafted on the surface of graphene, so a polyurethane prepolymer and amino-terminated graphene are combined through chemical bonds to form a graphene modified polyurethane emulsion which has certain anti-corrosion characteristics; meanwhile, a polyether chain between graphene and a polyurethane chain segment increases the hydrophilicity and dispersity of the polyurethane emulsion system, so various assistants can conveniently enter the polyurethane emulsion system to form a waterborne polyurethane coating, and the strength of the polyurethane coating is greatly improved; and water is used as a main solvent, so the paint is green and environment-friendly, and is suitable for coating of building interior walls, and a paint film formed after coating of the paint has good self-cleaning property, flat and smooth surface, excellent adhesive force and long anti-aging time.

Description

technical field [0001] The invention relates to the field of water-based paint, in particular to an anti-corrosion polyurethane water-based paint and a preparation method thereof. Background technique [0002] In recent years, with the introduction of some green environmental protection policies, water-based coatings have attracted more and more attention from researchers and enterprises. Water-based coatings are coatings prepared with water as the main solvent, but the introduction of water also brings a series of problems. The surface tension of water is large, and pigments and fillers cannot be fully dispersed, and water molecules are easy to enter the interior of the matrix and cause corrosion. It is often necessary to add an appropriate amount of additives to improve the performance of water-based coatings. However, additives such as wetting agents, dispersants, etc. are not easy to cross-link film-forming substances to form a film layer. During the drying process of t...

AI Technical Summary

Problems solved by technology

Water-based coatings are coatings prepared with water as the main solvent, but the introduction of water also brings a series of problems. The surface tension of water is large, and pigments and fillers cannot be fully dispersed, and water molecules are easy to enter the interior of the matrix and cause corrosion. It is often necessary to add an appropriate amount of additives to improve the performance of water-based coatings

However, additives such as wetting agents, dispersants, etc. are not easy to cross-link film-forming substances to form a film layer. During the drying process of the film layer, small molecules will volatilize, increasing VOC emissions, and large molecules cannot volatilize and remain in the film layer. In the film layer, it affects the corrosion resistance of the film layer