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Environment-friendly water-based two-component polyurethane paint and preparation method thereof

A water-based two-component, polyurethane coating technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy bubbles in the paint film, small molecular weight of hydroxyl components, long drying time, etc. The effect of good capacitance and simple preparation method

Inactive Publication Date: 2019-06-21
DONGGUAN DONGMENG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the enhancement of people's awareness of environmental protection and energy, especially the strict restrictions on the content of volatile organic compounds (VOC) in coating systems in various countries' environmental protection regulations, the development of low-pollution coatings represented by water-based coatings has been promoted. Water-based polyurethane coatings have high hardness. , good adhesion, abrasion resistance, good solvent resistance, excellent weather resistance and other advantages combined with the low VOC content of water-based polyurethane coatings, and polyurethane polymers have building material properties, using molecular design principles, combined with new synthesis and cross-linking The combined technology can effectively control the composition and structure of the coating polymer, so that the performance of the water-based polyurethane coating film is equivalent to or even better than that of the traditional solvent-based coatings, and it has become one of the fastest-growing coating varieties. Among them, the water-based acrylic polyurethane has a film-forming temperature. Low, strong adhesion, good wear resistance, high hardness, chemical resistance, and good weather resistance are widely used; however, the molecular weight of the hydroxyl component in waterborne acrylic polyurethane coatings is small and the drying time is long; -NCO and H2O reacts to produce CO2, which makes the paint film prone to bubbles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the embodiment of the present invention, an environment-friendly water-based two-component polyurethane coating includes component A and component B, and the mass ratio of component A and component B is 2:1;

[0032] The A component includes 30% of hydroxyacrylic acid dispersion I, 15% of hydroxyacrylic acid dispersion II, 0.2% of defoamer, 2.0% of dipropylene glycol butyl ether, 2.0% of ethylene glycol butyl ether, and 0.2% of leveling agent by weight percentage. %, color paste 15%, thickener 0.1%;

[0033] The B component includes 30% of propylene glycol diacetate, 43% of polyurethane curing agent I and 18% of polyurethane curing agent II by weight percentage.

[0034] The hydroxyl group content in the hydroxyacrylic acid dispersion I is 3.0 wt%, and the non-volatile content is 45 wt%.

[0035] The hydroxyl group content in the hydroxyacrylic acid dispersion II is 3.8 wt%, and the non-volatile content is 45 wt%.

[0036] The defoamer is a polysiloxane hydrophobic...

Embodiment 2

[0048] In the embodiment of the present invention, an environment-friendly water-based two-component polyurethane coating includes A component and B component, and the mass ratio of A component and B component is 3:1;

[0049]The A component includes 37.5% of hydroxyacrylic acid dispersion I, 22.5% of hydroxyacrylic acid dispersion II, 0.6% of defoamer, 2.5% of dipropylene glycol butyl ether, 2.5% of ethylene glycol butyl ether, Leveling agent 0.6%, color paste 26.5%, thickener 0.2%;

[0050] The B component includes 31.5% of propylene glycol diacetate, 46% of polyurethane curing agent I and 21% of polyurethane curing agent II by weight percentage.

[0051] The hydroxyl group content in the hydroxyacrylic acid dispersion I is 3.4 wt%, and the non-volatile content is 47.5 wt%.

[0052] The hydroxyl group content in the hydroxyacrylic acid dispersion II is 3.95 wt%, and the non-volatile content is 47.5 wt%.

[0053] The defoamer is a polysiloxane hydrophobic particle defoamer ...

Embodiment 3

[0065] In the embodiment of the present invention, an environment-friendly water-based two-component polyurethane coating comprises A component and B component, and the mass ratio of A component and B component is 4.5:1;

[0066] The A component includes 45% of hydroxyacrylic acid dispersion I, 30% of hydroxyacrylic acid dispersion II, 1.0% of defoamer, 3.0% of dipropylene glycol butyl ether, 3.0% of ethylene glycol butyl ether, and 1.0% of leveling agent by weight percentage. %, color paste 38%, thickener 0.3%;

[0067] The B component includes 30%-33% of propylene glycol diacetate, 49% of polyurethane curing agent I and 24% of polyurethane curing agent II by weight percentage.

[0068] The hydroxyl group content in the hydroxyacrylic acid dispersion I is 3.8 wt%, and the non-volatile content is 50 wt%.

[0069] The hydroxyl group content in the hydroxyacrylic acid dispersion II is 4.1 wt%, and the non-volatile content is 50 wt%.

[0070] The defoamer is a polysiloxane hydr...

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Abstract

The invention discloses an environment-friendly water-based two-component polyurethane paint and a preparation method thereof, and relates to the field of paint preparation. The environment-friendly water-based two-component polyurethane paint comprises a component A and a component B; the component A and the component B are in the mass ratio of (2.4 to 3.6) to (0.8 to 1.2); the hydroxyacrylic acid dispersion body and the low-viscosity isocyanate-containing curing agent used by the invention are good in compatibility; the environment-friendly water-based two-component polyurethane paint is simple in preparation method and convenient to construct; cosolvents with different volatilization rates are selected, so that the opening time of a paint film is prolonged, the volatilization of air bubbles is benefited, and the quality of the paint film is ensured; the environment-friendly water-based two-component polyurethane paint can be widely applied to paint and protection of mechanical surfaces, such as various automobile surfaces, coach carriages, locomotive heads, electrical equipment, automobile parts, and devices and instruments, with high requirements on decorativeness and weather resistance.

Description

technical field [0001] The invention relates to the field of paint preparation, in particular to an environment-friendly water-based two-component polyurethane paint and a preparation method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection and energy, especially the strict restrictions on the content of volatile organic compounds (VOC) in coating systems in various countries' environmental protection regulations, the development of low-pollution coatings represented by water-based coatings has been promoted. Water-based polyurethane coatings have high hardness. , good adhesion, abrasion resistance, good solvent resistance, excellent weather resistance and other advantages combined with the low VOC content of water-based polyurethane coatings, and polyurethane polymers have building material properties, using molecular design principles, combined with new synthesis and cross-linking The combined technology can effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/20C08G18/62
Inventor 汪艾军
Owner DONGGUAN DONGMENG CHEM CO LTD
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