Preparation method of low-VOC (volatile organic compound) composite coating applicable to field of heavy corrosion resistance

Abstract

The invention provides a preparation method of a low-VOC (volatile organic compound) composite coating applicable to the field of heavy corrosion resistance, which comprises a preparation method of a low-VOC solvent-free epoxy zinc-rich primer, a preparation method of a low-VOC solvent-free epoxy mica iron intermediate paint and a preparation method of a low-VOC polyurea corrosion-resistant finish paint. The low-VOC solvent-free epoxy zinc-rich primer comprises a component A and a component B. The low-VOC solvent-free epoxy mica iron intermediate paint comprises a component C and a component D. The low-VOC polyurea corrosion-resistant finish paint comprises a component E and a component F. The analysis on the properties through primer, intermediate paint and finish paint single-layer testing and the composite layer properties through illustration testing indicates that the composite coating prepared by the method is very effective when being used in the field of heavy corrosion resistance, can completely satisfy the requirements in the aspect of environmental protection, overcomes defect that the water-based paint can not satisfy and achieve the market requirements, has very excellent comprehensive properties, and greatly exceeds the expected corrosion resistance requirements.

Description

technical field [0001] The invention relates to the field of paint making, in particular to a method for preparing a low-VOC composite coating applied in the field of heavy anticorrosion. Background technique [0002] As the country's environmental protection requirements become more and more stringent, the country has successively issued a new "Environmental Protection Law", "consumption tax", "pollution discharge tax", and corresponding cities have issued a prohibition on the production and use of oil-based paint in order to control PM2.5. As a result, water-based paints, solvent-free and other ultra-low VOC emission coatings ushered in spring, but the inherent construction and performance defects of water-based paints cannot be solved at present. For example: in winter, almost all temperatures in the north are below zero, and water-based paints appear The phenomenon of ice makes it impossible to construct at all. In the south, under the environment of too low temperature ...

AI Technical Summary

Problems solved by technology

As a result, water-based paints, solvent-free and other ultra-low VOC emission coatings ushered in spring, but the inherent construction and performance defects of water-based paints cannot be solved at present. For example: in winter, almost all temperatures in the north are below zero, and water-based paints appear The phenomenon of ice makes it impossible to construct at all. In the south, under the environment of too low temperature and high humidity, water-based paint cannot dry for a long time, which seriously affects production efficiency and production delivery time, and is prone to sag, shrinkage cavity, Pinholes and other diseases, and how to make the water-based film thickness reach more than 150 microns (dry film thickness) at one time, are the problems that water-based paints still need to overcome.

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