A kind of anticorrosion type polyurethane water-based coating and preparation method thereof

Abstract

This case involves an anti-corrosion polyurethane water-based paint and its preparation method, using amino-terminated graphene and polyurethane prepolymer to synthesize a modified polyurethane emulsion, which is then made into a water-based paint. The present invention effectively solves the problem of uneven dispersion of graphene in polymer emulsions by modifying graphene, and grafts amino-terminated polyether chains on the surface of graphene to make polyurethane prepolymers and amino-terminated graphite Graphene is combined with chemical bonds to form graphene-modified polyurethane emulsion, so that it has certain anti-corrosion properties; at the same time, the polyether chain between graphene and polyurethane segments increases its hydrophilicity and dispersibility, making it easy for various additives to enter into the polyurethane emulsion system to form a water-based polyurethane coating, which greatly improves the strength of the polyurethane coating; water is used as the main solvent, which is environmentally friendly and suitable for coating the interior walls of buildings. The paint film formed after coating has good self- Cleanliness, flat and smooth surface, excellent adhesion, long aging resistance.

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

Images