Water-based double-component polyurethane finish paint and preparation method thereof

A two-component polyurethane and water-based technology, applied in the field of coatings, can solve the problems of poor compatibility and achieve good compatibility, high cross-linking density of the paint film, and low VOC content

Inactive Publication Date: 2017-06-06
HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrophobic low-viscosity asymmetric isocyanate trimer, with 100% solid content and a viscosity lower than 1000mPa·s, can be directly added to the water-based paint system. Chemical properties are good, but there is still a problem of poor compatibility when manually stirring in actual use
[0007] At present, there is a lack of a water-based two-component polyurethane topcoat with high foam-free film thickness and good chemical resistance and its preparation method

Method used

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  • Water-based double-component polyurethane finish paint and preparation method thereof
  • Water-based double-component polyurethane finish paint and preparation method thereof
  • Water-based double-component polyurethane finish paint and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A kind of waterborne two-component polyurethane topcoat of the present invention, described waterborne twocomponent polyurethane topcoat is made up of A component and B component, and described A component is made up of following components by weight percentage:

[0029]

[0030]

[0031] B component is isocyanate curing agent.

[0032] The weight ratio of the A component and the B component is 4:1.

[0033] The curing agent is a mixture of hydrophilic polyisocyanate and hydrophobic low-viscosity asymmetric isocyanate trimer.

[0034] The mass ratio of the hydrophilic polyisocyanate to the hydrophobic low-viscosity asymmetric isocyanate trimer is 1:1.

[0035] The hydrophilic polyisocyanate is WL72-100 from Asahi Kasei, and the hydrophobic low-viscosity asymmetric isocyanate trimer is XP 2840 from Covestro.

[0036] The preparation method of waterborne two-component polyurethane topcoat of the present invention, comprises the steps:

[0037] (1) Preparation of ...

Embodiment 2

[0041] The difference between embodiment 2 and embodiment 1 is:

[0042] A kind of waterborne two-component polyurethane topcoat of the present invention, described waterborne twocomponent polyurethane topcoat is made up of A component and B component, and described A component is made up of following components by weight percentage:

[0043]

[0044]

[0045] B component is isocyanate curing agent.

[0046] The weight ratio of the A component and the B component is 6:1.

[0047] The mass ratio of the hydrophilic polyisocyanate to the hydrophobic low-viscosity asymmetric isocyanate trimer is 3:1. The hydrophilic polyisocyanate is WL72-100 from Asahi Kasei, and the hydrophobic low-viscosity asymmetric isocyanate trimer is XP 2840 from Covestro.

[0048] The preparation method of waterborne two-component polyurethane topcoat of the present invention, comprises the steps:

[0049] (1) Preparation of component A: add deionized water, wetting and dispersing agent, defoamer...

Embodiment 3

[0053] The difference between embodiment 3 and embodiment 1 is:

[0054]A kind of waterborne two-component polyurethane topcoat of the present invention, described waterborne twocomponent polyurethane topcoat is made up of A component and B component, and described A component is made up of following components by weight percentage:

[0055]

[0056] B component is isocyanate curing agent.

[0057] The weight ratio of the A component and the B component is 5:1.

[0058] The mass ratio of the hydrophilic polyisocyanate to the hydrophobic low-viscosity asymmetric isocyanate trimer is 4:1. The hydrophilic polyisocyanate is WL72-100 from Asahi Kasei, and the hydrophobic low-viscosity asymmetric isocyanate trimer is XP 2840 from Covestro.

[0059] The preparation method of waterborne two-component polyurethane topcoat of the present invention, comprises the steps:

[0060] (1) Preparation of component A: add deionized water, wetting and dispersing agent, defoamer, and pigment...

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Abstract

The invention discloses a water-based double-component polyurethane finish paint and a preparation method thereof. The water-based double-component polyurethane finish paint is composed of a component A and a component B. The component A is composed of the following ingredients in percentage by weight: 10-15% of deionized water, 0.5-1.2% of wetting and dispersing agent, 0.1-0.5% of defoaming agent, 12-25% of pigment, 58-70% of water-based hydroxyacrylic acid dispersion, 0.5-1% of leveling agent, 0.1-0.5% of substrate wetting agent and 0.1-0.5% of rheologic assistant. The component B is an isocyanate curing agent. The water-based double-component polyurethane finish paint has the advantages of low VOC (volatile organic compound) content, high bubble-free film thickness and favorable chemical resistance. The paint film has high crosslinking density, and can not easily peel.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a water-based two-component polyurethane topcoat and a preparation method thereof. Background technique [0002] Water-based coatings are based on a variety of polymer resins and water is the dispersion medium. Compared with traditional solvent-based coatings, they have lower volatile organic compound (VOC) emissions and are green, safe and environmentally friendly coatings. my country is a big manufacturing country. A large amount of oil-based two-component polyurethane topcoat is used in machinery, rolling stock, steel structures and wooden furniture industries every year, which pollutes the surrounding environment and wastes oil resources to a great extent. At present, the water-based two-component polyurethane topcoat has the disadvantages of high VOC content, easy rash when sprayed, and poor chemical resistance of the paint film, so it is still difficult to popularize and apply it on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C08G18/72C08G18/79C08G18/62
CPCC09D175/04C08G18/6216C08G18/721C08G18/79
Inventor 郭晓峰王瑞宏郭晓猛李幕英
Owner HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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