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Aqueous polyurethane middle coating and preparation method thereof

A water-based polyurethane and painting technology, applied in the field of coatings, can solve environmental pollution and other problems, achieve the effects of reducing environmental pollution, promoting the coordinated development of economy and environment, and excellent stone chipping resistance

Inactive Publication Date: 2017-07-28
重庆汉宝水性漆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a kind of water-based polyurethane intermediate paint, to solve the problem that my country's automotive intermediate paint is still based on solvent type, and the intermediate paint of solvent type system contains a large amount of volatile organic compounds (VOC). The pollution to the environment is very serious, and countries around the world have successively formulated relevant regulations to restrict the use of technical issues

Method used

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  • Aqueous polyurethane middle coating and preparation method thereof
  • Aqueous polyurethane middle coating and preparation method thereof
  • Aqueous polyurethane middle coating and preparation method thereof

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preparation example Construction

[0065] According to another aspect of the present invention, the present invention provides the preparation method of the above-mentioned water-based polyurethane middle paint, comprising the steps of: weighing water-based hydroxyl acrylic acid dispersion, anionic polyacrylic acid dispersion, water-based aliphatic isocyanate, pigment and filler , additives, deionized water and optional co-solvents are mixed evenly and ground to obtain a water-based polyurethane mid-coat.

[0066] In a preferred embodiment of the present invention, the particle size of the paint in the water-based polyurethane after grinding is less than 30 μm, so that the coated paint film is smoother, and the coating thickness reaches more than 80 μm, which can still maintain good anti-sag characteristic.

[0067] The preparation method of the water-based polyurethane mid-paint provided by the invention uses deionized water as a solvent, has simple process and convenient preparation, can effectively improve t...

Embodiment 1

[0070] This embodiment provides a kind of water-based polyurethane intermediate coating, including the following components in parts by mass: 15 parts of water-based hydroxyl acrylic acid dispersion, 25 parts of anionic polyacrylic acid dispersion, 5 parts of water-based aliphatic isocyanate, ultrafine carbonic acid 5 parts of calcium, 5 parts of precipitated barium sulfate, 5 parts of superfine talc, 10 parts of rutile titanium dioxide, 0.5 parts of carbon black, 1 part of tego755, 0.5 parts of tego760, 0.2 parts of tego270, 0.2 parts of tego280, polyether modified organic 0.2 parts of silicon (BYK-333), 1 part of hydrophobically modified polyurethane (RW-8W), 0.2 parts of non-ionic polyurethane (105A), 5 parts of propylene glycol methyl ether acetate, 10 parts of deionized water.

Embodiment 2

[0072] This embodiment provides a kind of water-based polyurethane intermediate coating, including the following components in parts by mass: 30 parts of water-based hydroxyl acrylic acid dispersion, 10 parts of anionic polyacrylic acid dispersion, 15 parts of water-based aliphatic isocyanate, ultrafine carbonic acid 10 parts of calcium, 10 parts of precipitated barium sulfate, 10 parts of superfine talc powder, 15 parts of rutile titanium dioxide, 1 part of carbon black, 1.5 parts of tego755, 1 part of tego760, 0.5 parts of tego270, 0.5 parts of tego280, polyether modified organic 0.5 parts of silicon (BYK-333), 0.5 parts of hydrophobically modified polyurethane (RW-8W), 0.5 parts of non-ionic polyurethane (105A), 3 parts of propylene glycol methyl ether acetate, 1 part of ethylene glycol, alcohol ester-12 0.5 parts, 30 parts of deionized water.

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Abstract

The invention provides an aqueous polyurethane middle coating and a preparation method thereof and relates to the technical field of paint. The aqueous polyurethane middle coating comprises, by mass, 15 to 30 parts of an aqueous hydroxyacrylic acid dispersion, 10 to 25 parts of an anionic polyacrylic acid dispersion, 5 to 15 parts of a water-based aliphatic isocyanate, 15 to 55 parts of pigments and fillers, 6 to 19 parts of additives and 10 to 30 parts of deionized water. The aqueous polyurethane middle coating solves the problem that the existing middle coatings for vehicles in China mainly comprise solvent-type coatings containing a large amount of volatile organic compounds (VOC) so that environmental pollution is very severe. The aqueous polyurethane middle coating utilizes deionized water as a solvent so that toxic and harmful substances are significantly reduced and the environment and economy synergetic development is promoted. When the coating thickness is 80 microns or more, adhesion of the middle coating to the primer and finishing paint is better and excellent stone impact resistance is obtained.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based polyurethane intermediate coating and a preparation method thereof. Background technique [0002] With the rapid development of economy and transportation, automobiles, construction machinery, and rail transit have become an important part of the gross domestic product, which has brought huge business opportunities to the automotive coatings and coating industry. The current automotive paint layer is generally a composite paint layer, usually including a primer layer, a mid-coat paint layer and a topcoat layer. The mid-coat paint layer is between the primer layer and the topcoat layer. A certain filling property can not only improve the roughness and flatness of the primer layer, fill up the tiny defects on the surface of the substrate, but also improve the adhesion and fullness of the surface layer, and enhance the decoration and leveling of the topcoat layer And...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D133/00C09D7/00
CPCC09D175/04C08L2205/025C08L2205/035C09D7/20C09D133/00C08L33/00C08L75/04
Inventor 陈再兵
Owner 重庆汉宝水性漆有限公司