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Automotive aqueous polyurethane coating and preparation method thereof

A technology of water-based polyurethane and solvent-free polyurethane, which is applied in the direction of anti-fouling/underwater coatings, paints containing biocide, etc., can solve problems such as difficult access, no attention to product environmental protection issues, difficult emulsification, etc., and achieve improved hydrophilicity , good emulsifying effect, excellent water resistance

Inactive Publication Date: 2017-12-19
上海丹韵投资管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the component formula of the coating in this application is not aimed at automotive coatings, and the environmental protection of the product has not been noticed. In addition, in the preparation method of this application, it is difficult for the ammonia neutralizing agent to enter the polyurethane prepolymer system, and the emulsification is relatively difficult. And other issues

Method used

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  • Automotive aqueous polyurethane coating and preparation method thereof
  • Automotive aqueous polyurethane coating and preparation method thereof
  • Automotive aqueous polyurethane coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A water-based polyurethane coating for vehicles, comprising the following components: a solvent-free polyurethane resin prepolymer as a main body; water as a dispersion medium; an amine-based crosslinking agent for crosslinking water-based polyurethane, which is used in this embodiment Aliphatic amine crosslinker.

[0033] Among them, the solvent-free polyurethane resin prepolymer is obtained by prepolymerizing isophorone diisocyanate, linear aliphatic polycarbonate polyester polyol and dihydroxymethylpropionic acid as raw materials.

[0034] In the present embodiment, the preparation method of water-based polyurethane paint for vehicles specifically includes the following steps:

[0035] (1) Weigh 20 parts of linear aliphatic polycarbonate polyester polyols through dehydration and drop into a reaction kettle with a thermometer, a condensation device and a mechanical stirring device, and dropwise add 3 parts of bishydroxymethyl propionic acid Solvent and 10 parts of is...

Embodiment 2

[0040] The preparation method of water-based polyurethane paint for automobiles specifically comprises the steps:

[0041] (1) Weigh 25 parts of linear aliphatic polycarbonate polyester polyols through dehydration and drop into a reaction kettle with a thermometer, a condensation device and a mechanical stirring device, and dropwise add 3.5 parts of bishydroxymethyl propionic acid Solvent and 13 parts of isophorone diisocyanate, the mixed solution was reacted within a temperature range of 75°C for 4 hours, and the NCO mass content in the obtained prepolymer was 1.8%;

[0042] (2) Lower the temperature to about 40°C, add 3.5 parts of ammonia neutralizing reagent, stir for 30 minutes, and finally add 50 parts of deionized water under high-speed shear at a speed greater than 2000rpm to emulsify, disperse for 25 minutes, and obtain slightly blue light water-based emulsion;

[0043] (3) remove solvent, add 1.5 parts of amine-based cross-linking agent;

[0044] (4) Add 0.5 part of...

Embodiment 3

[0046] The preparation method of water-based polyurethane paint for automobiles specifically comprises the steps:

[0047](1) Weigh 30 parts of linear aliphatic polycarbonate polyester polyols through dehydration and drop into a reaction kettle with a thermometer, a condensation device and a mechanical stirring device, and dropwise add 4 parts of bishydroxymethyl propionic acid Solvent and 16 parts of isophorone diisocyanate, the mixed solution was reacted within the temperature range of 90° C. for 4 hours, and the NCO mass content in the obtained prepolymer was 2.0%;

[0048] (2) Lower the temperature to about 30°C, add 4 parts of ammonia neutralizing reagent, stir for 40 minutes, and finally add 60 parts of deionized water under high-speed shear at a speed greater than 2000rpm to emulsify, disperse for 30 minutes, and obtain slightly blue light water-based emulsion;

[0049] (3) remove solvent, add 2 parts of amine-based cross-linking agent;

[0050] (4) Finally, add 1 par...

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Abstract

The invention discloses an automotive aqueous polyurethane coating. The automotive aqueous polyurethane coating comprises the following components in parts by weight: 30 to 70 parts of a solvent-free polyurethane resin prepolymer, 30 to 70 parts of water, 0.1 to 5 parts of an amino cross-linking agent, 0.1 to 5 parts of an amino neutralization reagent and 0.1 to 2 parts of a degerming agent. The invention also discloses a preparation method of the automotive aqueous polyurethane coating. The aqueous polyurethane coating has the advantages of oily polyurethane such as high hardness, high adhesive force, solvent resistance, acid and base resistance and corrosion resistance and besides, and has the advantage that the VOCS content of the aqueous coating is low.

Description

technical field [0001] The application belongs to the field of polyurethane coatings, in particular to a water-based polyurethane coating for vehicles and a preparation method thereof. Background technique [0002] Polyurethane coatings have excellent properties such as abrasion resistance, flexibility, adhesion and chemical resistance, and are widely used as wood coatings, architectural coatings, automotive coatings and waterproof coatings. However, because solvent-based coatings contain a large amount of organic solvents, they seriously pollute the environment, especially the residual isocyanate monomers in solvent-based two-component polyurethanes, which are extremely toxic. With the improvement of the quality of human life, environmental protection regulations are becoming more and more stringent. Various environmental protection regulations have strict restrictions on the emission of volatile organic compounds (VOC) and the content of harmful solvents. Water-based poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D5/14C08G18/66C08G18/44C08G18/32C08G18/34
CPCC09D175/06C08G18/3228C08G18/348C08G18/44C08G18/6651C09D5/14
Inventor 眭旭嫔胡春林
Owner 上海丹韵投资管理有限公司
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