Waterborne surface coating for three-rolling and one-baking process and preparation method thereof

A surface coating, water-based technology, applied in the direction of coating, etc., can solve the problems of insufficient corrosion resistance, coating peeling, large environmental pollution, etc., and achieve the goal of improving interlayer adhesion, good migration of pigments and fillers, and excellent weather resistance Effect

Active Publication Date: 2014-07-09
HAOLISEN COATING SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the coating method commonly used in the automotive industry, building materials, hardware, home appliances and other metal coating fields is that the primer is water-based cathodic electrophoretic coating, after drying, spray solvent-based topcoat, and then spray solvent-based varnish after drying Paint, three-coating and three-baking process, this kind of coating method is a serious waste of energy, and it is more polluting to the environment, which completely deviates from the development trend of environmental protection
Due to the large difference in product structure between water-based cathodic electrophoretic coatings and solvent-based topcoats and varnishes in the current coating method, there is often poor interlayer adhesion between the primer and the topcoat, and gaps between coatings occur. Peeling, seriously affecting the performance of the product
[0003] Invention patent (CN101528362A) discloses a coating method for plastic molded products. It adopts a three-coating and one-baking process. Low-temperature baking can form a coating method for coating films such as adhesion, water resistance, and durability to plastic molded products. , but not for metal workpieces
Invention patent (CN102341190A) discloses a method for forming a multi-layer paint film on the outer cover of an automobile. Three coats and one bake can provide good paint film appearance and chipping resistance. Although this paint is used for metal components, However, the primer uses water-based coloring paint, which has insufficient corrosion resistance, and corrosion is one of the most serious causes of metal loss. At present, there is no product on the market that performs three-coating and one-baking on metal workpieces after being painted with water-based cathodic electrophoretic coatings. Corrosion-resistant metal workpieces also have excellent aging resistance

Method used

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  • Waterborne surface coating for three-rolling and one-baking process and preparation method thereof
  • Waterborne surface coating for three-rolling and one-baking process and preparation method thereof
  • Waterborne surface coating for three-rolling and one-baking process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) The formula of the polyether modified cationic acrylic resin:

[0019]

[0020]

[0021] Mix glycidyl methacrylate, hydroxyethyl methacrylate, methyl methacrylate, isooctyl acrylate, styrene and three-quarters of benzoyl peroxide evenly according to the formula, called mixing Solution a: mix one-fourth of benzoyl peroxide and methyl isobutyl ketone according to the formula amount, which is called mixed solution b. Add ethylene glycol monobutyl ether, n-butanol, methallyl alcohol polyoxyethylene ether and isobutenyl alcohol polyoxyethylene ether into the reaction vessel with agitator and condensing tube according to the formula, blow nitrogen, heat up to 110 ℃, start to add the mixed solution a dropwise, keep the temperature for half an hour after dropping for 3 hours, then add the mixed solution b dropwise, finish dropping for half an hour, then keep the temperature for half an hour, then add 3-5 parts by weight of N-ethylethanolamine dropwise, half an hour Af...

Embodiment 2

[0027] 1) The polyether modified cationic acrylic resin formula:

[0028]

[0029]

[0030] Mix glycidyl methacrylate, hydroxyethyl methacrylate, methyl methacrylate, isooctyl acrylate, styrene and three-quarters of benzoyl peroxide evenly according to the formula, called mixing Solution a: mix one-fourth of benzoyl peroxide and methyl isobutyl ketone according to the formula amount, which is called mixed solution b. Add ethylene glycol monobutyl ether, n-butanol, methallyl alcohol polyoxyethylene ether and isobutenyl alcohol polyoxyethylene ether into the reaction vessel with agitator and condensing tube according to the formula, blow nitrogen, heat up to 110 ℃, start to add the mixed solution a dropwise, keep the temperature for half an hour after dropping for 3 hours, then add the mixed solution b dropwise, finish dropping for half an hour, then keep the temperature for half an hour, then add 3-5 parts by weight of N-ethylethanolamine dropwise, half an hour After hou...

Embodiment 3

[0036] 1) The polyether modified cationic acrylic resin formula:

[0037]

[0038]Mix glycidyl methacrylate, hydroxyethyl methacrylate, methyl methacrylate, isooctyl acrylate, styrene and three-quarters of benzoyl peroxide evenly according to the formula, called mixing Solution a: mix one-fourth of benzoyl peroxide and methyl isobutyl ketone according to the formula amount, which is called mixed solution b. Add ethylene glycol monobutyl ether, n-butanol, methallyl alcohol polyoxyethylene ether and isobutenyl alcohol polyoxyethylene ether into the reaction vessel with agitator and condensing tube according to the formula, blow nitrogen, heat up to 110 ℃, start to add the mixed solution a dropwise, keep the temperature for half an hour after dropping for 3 hours, then add the mixed solution b dropwise, finish dropping for half an hour, then keep the temperature for half an hour, then add 3-5 parts by weight of N-ethylethanolamine dropwise, half an hour After hours of drippin...

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Abstract

The invention relates to a waterborne surface coating for a three-rolling and one-baking process and a preparation method thereof. The coating is a single component and comprises 8-12 parts of polyether modified cation acrylic resin with a comb structure, 2-3 parts of amino resin, 0.2-0.8 part of neutralizer, 20-30 parts of filler, 2-4 parts of nano titanium sol, 0.05-0.2 part of waterborne flatting agent, 0.05-0.3 part of waterborne thickener and 49.7-67.7 parts of deionized water, wherein the viscosity is 100-160s, and the fineness is smaller than or equal to 15mu m. The coating disclosed by the invention is applicable to a three-coating and one-baking process of a metal work-piece, the adhesive force of the coating is obviously better than that of the three-coating and three-baking process, and no color migration between three coatings is generated. The final hardness of the coating can be up to 2H, the impact strength is 50Kg.cm, the adhesive force is 0 level, the waterborne surface coating also has excellent weathering resistance, the light loss rate is smaller than or equal to 10%, delta E is smaller than or equal to 1.0 by a QUV aging test for 1500 hours, the waterborne surface coating has good corrosion resistance, the salt fog resistance can be up to 1,000 hours, and the one-way corrosion width is smaller than or equal to 2mm.

Description

[technical field] [0001] The invention belongs to the technical field of water-based coatings and preparation methods, and relates to a water-based surface coating for three-coating and one-baking and a preparation method thereof. [Background technique] [0002] At present, the coating method commonly used in the automotive industry, building materials, hardware, home appliances and other metal coating fields is that the primer is water-based cathodic electrophoretic coating, after drying, spray solvent-based topcoat, and then spray solvent-based varnish after drying Paint, three-coating and three-baking process, this kind of coating method is a serious waste of energy, and it is more polluting to the environment, which completely deviates from the development trend of environmental protection. Due to the large difference in product structure between water-based cathodic electrophoretic coatings and solvent-based topcoats and varnishes in the current coating method, there is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D151/08C09D161/20C09D161/32C09D7/12C08F283/06
Inventor 孔凡桃刘薇薇赵颖徐庆
Owner HAOLISEN COATING SHANGHAI
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