Waterborne two-component acrylic polyurethane finishing coat with super weatherability and preparation method thereof

Abstract

The invention especially relates to a waterborne two-component acrylic polyurethane finishing coat with super weatherability and a preparation method thereof, belonging to the field of medical detection. The waterborne two-component acrylic polyurethane finishing coat with super weatherability is prepared with a blend of waterborne hydroxyl-containing fluorine dispersion acrylic resin and waterborne high-hydroxyl acrylic dispersion as a film forming substance; after artificial accelerated aging testing for over 2000 h, the gloss loss of the finishing coat is less than 10% and the chromatic aberration of the finishing coat is less than 1.0, so the finishing coat can totally meet the demands of high-grade external finishing coats used for automobiles; since a C-F bond is introduced as a skeleton, the chemical resistance and weatherability of the finishing coat are greatly improved; the finishing coat has excellent gloss retention, color retention and cleanness retention properties, and is free of color changes and cracks within 15 years; the usage of the waterborne high-hydroxyl acrylic dispersion improves the crosslinking density of a paint film and enhances the hardness and rigidity of the finishing coat; and a curing agent of an emulsification protection system is adopted, so an activation period is long, reactions with water are few, paint film defects are reduced, and the usage amount of the curing agent is low.

Description

technical field [0001] The invention relates to the field of metal protection, in particular to a water-based super weather-resistant two-component acrylic polyurethane topcoat and a preparation method thereof. Background technique [0002] As people pay more and more attention to the environment and health, water-based coatings have been used more and more widely. The pollution caused by volatile organic compounds (VOCs) released during the production and use of traditional solvent-based coatings has become a major pollutant at present. As the main source of pollution in cities after automobiles, water-based coatings, as one of the alternatives to traditional solvent-based coatings, can reduce VOC emissions, waste generation, and reduce workers' exposure to toxic emissions. It is reported that during the "13th Five-Year Plan" period, the country will strengthen the control of the total amount of volatile organic compounds (VOC), and carry out coordinated emission reduction ...

AI Technical Summary

Problems solved by technology

Water-based electrophoretic paint has been widely used for primers, while most manufacturers of intermediate and top coats still use oil-based paints. The reason is that there is a certain gap between water-based paints and paints in terms of drying speed and sandability, and the hardness of the paint film is not high enough. Disadvantages such as scratches, poor chemical resistance, and low solid content