Water-based primer-topcoat braking paint and preparation method thereof

Abstract

The invention relates to a water-based primer-topcoat braking paint and a preparation method thereof. The braking paint comprises the following materials by weight percentage: 30-40 of water-based acrylic resin, 2-10 of amino resin, 1-3 of neutralizing agent, 2-5 of compound rustproofing pigment, 1-3 of tinting pigment, 10-20 of filling agent, 0.1-0.5 of defoaming agent, 0.1-0.5 of flatting agent and 25-40 of deionized water, wherein the water-based acrylic resin is a free radical polymerization resultant which comprises the following materials by weight percentage: 10-30 of monomer containing hydroxy acrylic acid, 5-20 of monomer containing carboxyl acrylic acid, 2-8 of internal crosslinking monomer, 20-40 of other acrylic acid monomer, 15-30 of phenyl ethylene monomer, 1-5 of evocating agent and 40-50 of alcohol ether latent solvent. When the paint is prepared, the dispersion and the abrading condition of the pigments and the filling agents are reasonably controlled to ensure that each component of the paint fully plays the respective function. The paint ensures the corrosion prevention effect and the decoration of a coating and realizes the combination of a primer and a topcoat.

Description

technical field [0001] The invention relates to a water-based bottom-surface-in-one baking coating and a preparation method thereof, which is especially suitable for rust prevention and decoration of steel structures such as metal machinery. Background technique [0002] Water-based coatings use water instead of organic solvents, which can greatly reduce the use of organic solvents in the coatings industry, and have the advantages of low energy consumption and low emissions. It has become the development direction of coatings in the world. Cathodic electrophoretic coatings and water-based epoxy-amine curing systems with epoxy resin (mostly bisphenol A epoxy resin) as the main film-forming material have high adhesion and excellent corrosion resistance, but epoxy resin The outdoor weather resistance is relatively poor, easy to pulverize, lose gloss, and the fullness of the coating film is not high, so it is not suitable for high-quality outdoor paint and high decorative paint,...

AI Technical Summary

Problems solved by technology

Cathodic electrophoretic coatings and water-based epoxy-amine curing systems with epoxy resin (mostly bisphenol A epoxy resin) as the main film-forming material have high adhesion and excellent corrosion resistance, but epoxy resin The outdoor weather resistance is relatively poor, easy to pulverize, lose gloss, and the fullness of the coating film is not high, so it is not suitable for high-quality outdoor paint and high decorative paint, and is often used as a primer; And gloss and color retention, it has good decorative properties in various coatings, but its anti-corrosion performance is slightly poor, and it is often used as a top coat

Therefore, in order to achieve corrosion resistance, aging resistance and better decorative performance, current metal parts such as lamps, toys, motorcycle frames, compressors, and automobile chassis generally require two-step spraying, namely spraying primer and spraying Topcoat, its construction is cumbersome and the production cost is relatively high