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A kind of water-based paint that can be baked at high temperature

A water-based coating, high temperature technology, applied in epoxy resin coatings, polyurea/polyurethane coatings, chloroprene homopolymer coatings, etc., can solve the problems of large differences in drying environment, cracking of coating films, slow volatilization process, etc.

Active Publication Date: 2019-10-22
湖南金利源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although water-based paints use water as a solvent to avoid the harm caused by organic solvents, water in water-based paints has a high boiling point, so the volatilization process is very slow, and the drying speed strongly depends on the humidity of the environment
Especially when the coating thickness of the water-based coating is thicker (above 2mm), if the drying method of high temperature (higher than 120°C) is used, the drying environment inside and outside the coating film will be quite different, causing the surface layer to dry first during drying. A dense organic film is formed on the surface, which hinders the escape of internal moisture. Under high temperature, the unescaped internal moisture vaporizes rapidly. When the internal water vapor reaches a certain pressure, the surface coating film will be broken, and the coating film will crack and bulge. Bubbles, decreased adhesion, etc.

Method used

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  • A kind of water-based paint that can be baked at high temperature
  • A kind of water-based paint that can be baked at high temperature
  • A kind of water-based paint that can be baked at high temperature

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preparation example Construction

[0041] In the present invention, there is no special limitation on the preparation method of the high-temperature bakeable water-based coating, and the method for preparing the composition well known to those skilled in the art can be used. In the present invention, the preparation of the high-temperature bakeable water-based paint preferably includes the following steps: mixing quick-drying emulsion, common filler, thermally conductive filler, porous filler, anti-cracking fiber, dispersant, wetting agent, anti-sedimentation agent, colorant slurry, mixed with water to obtain a water-based paint that can be baked at a high temperature.

[0042] The present invention preferably mixes the quick-drying emulsion with a dispersant, a wetting agent, an anti-sedimentation agent and a color paste to obtain a mixed material; then the mixed material is mixed with a common filler, a thermally conductive filler and a porous filler to obtain a slurry; finally the The slurry is mixed with wa...

Embodiment 1

[0092] Raw materials include the following components in mass content: quick-drying emulsion 40% (solid content 42%), filler 45%, porous filler 10%, polypropylene fiber 0.3%, dispersant 2.4%, wetting agent 0.3%, anti-sedimentation Agent 1.0%, pigment 0.5%, thickener 0.25%, defoamer 0.25%, water 0%;

[0093] in,

[0094] Quick-drying emulsion: 20g of styrene-butadiene emulsion with a Tg of 20°C, 10g of water-based epoxy resin, and 10g of water-based polyurethane resin;

[0095] Ordinary filler: 35g of talc powder with a particle size of 325 mesh, 10g of mica powder with a particle size of 400 mesh;

[0096] Porous filler: 5g of zeolite powder with a porosity of 30% and a particle size of 200 mesh, 5g of a molecular sieve with a porosity of 45% and a particle size of 200 mesh;

[0097] Thermally conductive filler: silicon carbide 15g,

[0098] Polypropylene fiber 0.3g, length 3mm;

[0099] Dispersant Tego 760W 2.5g;

[0100] Wetting agent Tego 245 0.3g;

[0101] Anti-settl...

Embodiment 2

[0109] Raw materials include the following components in mass content: 35% of quick-drying emulsion (solid content 45%), 28.7% of common filler, 15% of thermally conductive filler, 15% of porous filler, 0.3% of polyacrylonitrile fiber, 3% of dispersant, wetting Agent 1.0%, anti-settling agent 0.8%, pigment 0.5%, thickener 0.35%, defoamer 0.35%, water 0%;

[0110] in,

[0111] Quick drying lotion: T g 15g of tertiary vinegar emulsion at 20°C, T g 10g of polyvinyl acetate emulsion at 50°C, T g 10g of chlorine partial emulsion at -10°C;

[0112] Filler: 18.7g of calcium carbonate with a particle size of 325 mesh, 10g of mica powder with a particle size of 100 mesh;

[0113] Thermally conductive filler: 15g of thermally conductive graphite with a particle size of 400 mesh;

[0114] Polyacrylonitrile fiber 0.3g, length 3mm;

[0115] Porous filler: 15g of diatomite with a porosity of 40% and a particle size of 400 mesh;

[0116] Dispersant Tego 750W 3g;

[0117] Wetting agen...

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Abstract

The invention provides high-temperature-baking resistant and water-based paint. The provided high-temperature-baking resistant and water-based paint utilizes the molecular design of quick drying emulsion, water in a coating thus quickly escapes, and the purpose of quick drying is achieved; by adding heat conducting filler, the difference between the inside temperature and the outside temperature of the paint is adjusted, and the gasification speed and escaping speed of the water are controlled; meanwhile by using the microporous foaming technology of the porous filler, the inside and outside of the paint form an interpenetrating microporous network system, steam in the paint thus can be smoothly led out, and key problems that a formed film is cracked and bulging occurs in the high-temperature baking process of water-based damping paint and other problems are solved fundamentally. The experimental results show that when the provided high-temperature-baking resistant and water-based paint is 2 mm, after being braked at 140 DEG C for 30 min, the film is not cracked, no bulging occurs, and the adhesion of the paint to a substrate is good.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a water-based coating that can be baked at a high temperature. Background technique [0002] Coatings are a mixture of polymer resins, pigments and fillers, additives and solvents, etc., and can be coated on the surface of the substrate to form a new type of polymer material that adheres firmly and continuously. Traditional solvent-based coatings contain a large amount of organic volatiles during their manufacture and use, which has brought more or less pollution and damage to the environment and caused harm to the human body. While the development of coatings is constantly improving human material production and living needs, it also rapidly deteriorates the environment. [0003] Water-based coatings, also known as water-based coatings and water-dispersed coatings, are a type of coating that uses water as a solvent or dispersion medium, and has been widely used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D109/06C09D111/00C09D131/04C09D163/00C09D175/04C09D127/08C09D7/61
Inventor 张继德
Owner 湖南金利源新材料科技有限公司
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