A kind of water-based high temperature varnish that can be used for wet-on-wet process and preparation method thereof

Abstract

The invention belongs to the technical field of automobile coatings and particularly relates to high-temperature waterborne varnish applicable to a wet-to-wet process and a preparation method of the varnish. The high-temperature waterborne varnish applicable to the wet-to-wet process is prepared from components in percentage by mass as follows: 50%-70% of waterborne polyurethane polyol dispersoid,1%-2% of an amine neutralizer, 5%-10% of ethylene glycol butyl ether, 10%-15% of methylated amino resin, 3%-5% of an enclosed polyurethane curing agent, 1%-2% of a catalyst, 0.2%-0.4% of a levellingagent, 0.1%-0.2% of a defoaming agent, 0.3%-0.5% of a basic wetting agent and 10%-15% of pure water. The provided high-temperature waterborne varnish applicable to the wet-to-wet process has excellentperformance, has the all properties of a film reaching the level of oil varnish, has good weather fastness and stone impact resistance and is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of automobile coatings, and in particular relates to a water-based high-temperature varnish which can be used in a wet-on-wet process and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, the world's important issues in the field of automotive coatings and coatings are to adapt to the requirements of the times: environmental protection, energy saving, resource saving, and reduction of coating costs on the basis of high quality, and reduction of VOC (volatile organic compounds) discharge volume. When the first coat of paint is not completely dry, the second coat is sprayed. This spraying process is called "wet on wet". The wet-on-wet process is a way to save energy and reduce work steps, but it is not suitable for all coatings. Traditional varnishes are dominated by solvent-based products. From the early phenolic paints, alkyd paints, nitro paints to the a...

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Problems solved by technology

[0003] Chinese patent CN102558981B discloses a high-temperature varnish, including a thermosetting acrylic resin, an anti-sag resin, an amino resin, an organic solvent, a catalyst and an auxiliary agent, wherein the thermosetting acrylic resin contains a thermosetting acrylic resin I, and the thermosetting acrylic resin I Glass transition temperature ≤ -5 degrees Celsius, hydroxyl value 50-120mgKOH / g, acid value 7.5-15, and the thermosetting acrylic resin accounts for 30-40% by weight of the total content of the high-temperature varnish, and the high-temperature varnish has high scratch resistance , however, its formula contains 10-25% organic solvents, which is not conducive to environmental protection

Although there are many influencing factors, in addition to the relatively high price of the product, the main problem is that the performance and quality of water-based varnishes are not satisfactory.

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