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Water-based strong-weather-resistant self-repairing two-component polyurethane topcoat and preparation method thereof

A two-component polyurethane, weather resistance technology, applied in the field of coatings, can solve the problems of poor weather resistance, poor self-healing ability, etc., and achieve the effect of prolonging the shelf life, obvious self-healing ability, and low VOC content

Pending Publication Date: 2018-08-14
HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor weather resistance and poor self-repair ability in existing water-based two-component polyurethane coatings, the present invention provides a water-based two-component polyurethane topcoat with strong weather resistance and self-repair

Method used

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  • Water-based strong-weather-resistant self-repairing two-component polyurethane topcoat and preparation method thereof
  • Water-based strong-weather-resistant self-repairing two-component polyurethane topcoat and preparation method thereof
  • Water-based strong-weather-resistant self-repairing two-component polyurethane topcoat and preparation method thereof

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preparation example Construction

[0032] And, the embodiment of the present invention also provides a method for preparing a water-based weather-resistant and self-repairable two-component polyurethane topcoat. The preparation method at least includes the following steps:

[0033] Step a, according to the raw material formula of the above-mentioned two-component polyurethane topcoat with strong water-based weather resistance and self-repairing, weigh each raw material component, mix 50-70% deionized water, 40-60% neutralizer, defoaming Add agent, dispersant, 15-25% co-solvent, and pigment into the stock preparation pot in sequence, and after mixing evenly, grind to obtain the early stage slurry;

[0034] Step b, adding the water-based hydroxyacrylic acid emulsion and the remaining deionized water, neutralizing agent, and co-solvent into the mixing container in sequence, and mixing evenly;

[0035] Step c, adding the pre-phase slurry into the mixture obtained in step b, and mixing evenly;

[0036] Step d, add wa...

Embodiment 1

[0045] The embodiment of the present invention provides a two-component polyurethane topcoat with strong water-based weather resistance and self-healing, which is formed by mixing a group A mixture and a group B mixture, and the group A mixture includes the following raw materials in weight percentage:

[0046]

[0047] The group B mixture includes aliphatic isocyanate and ester organic solvent, wherein the weight of the aliphatic isocyanate accounts for 75wt% of the total weight of the aliphatic isocyanate and the ester organic solvent;

[0048] The mass ratio of the mixture of the group A to the mixture of the group B is the mixture of the group A:the mixture of the group B=4.5:1.

[0049] Among them, the water-based hydroxyl acrylic emulsion is the high-gloss acrylic dispersion A2743 of Shanghai Yuanhe Chemical Co., Ltd., the curing agent is Bayer's aliphatic isocyanate N3900, the co-solvent is propylene glycol butyl ether, and the water-based ultraviolet absorber UV326 p...

Embodiment 2

[0058] The embodiment of the present invention provides a two-component polyurethane topcoat with strong water-based weather resistance and self-healing, which is formed by mixing a group A mixture and a group B mixture, and the group A mixture includes the following raw materials in weight percentage:

[0059]

[0060]

[0061] The group B mixture includes aliphatic isocyanate and ester organic solvent, wherein the weight of the aliphatic isocyanate accounts for 75wt% of the total weight of the aliphatic isocyanate and the ester organic solvent;

[0062] The mass ratio of the mixture of the group A to the mixture of the group B is the mixture of the group A:the mixture of the group B=4.5:1.

[0063] Among them, the water-based hydroxyl acrylic emulsion is the high-gloss acrylic dispersion A2743 of Shanghai Yuanhe Chemical Co., Ltd., the curing agent is Bayer's aliphatic isocyanate N3900, the co-solvent is propylene glycol methyl ether, and the water-based ultraviolet abs...

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Abstract

The invention relates to a water-based strong-weather-resistant self-repairing two-component polyurethane topcoat and a preparation method thereof. The topcoat is prepared by mixing a mixture of a group A and a mixture of a group B, wherein the mixture of the group A comprises a water-based hydroxyl acrylic emulsion, a co-solvent, a water-based ultraviolet light absorber, a water-based oilfield fluorescent shielding agent, a neutralizer, a defoaming agent, a dispersant, a pigment, a levelling agent, a substrate wetting agent, deionized water and a thickening agent; and the mixture of the groupB comprises aliphatic isocyanate and an ester organic solvent, and a mass ratio of the mixture of the group A to the mixture of the group B is (4.5-5.5):1. The preparation method comprises the following steps: mixing 50-70% of the deionized water, 40-60% of the neutralizer, the defoaming agent, the dispersant, 15-25% of the co-solvent and the pigment, performing grinding to obtain pre-stage slurry, mixing the water-based hydroxyl acrylic emulsion, and the remaining deionized water, neutralizer and co-solvent, adding the pre-stage slurry into the mixed material, performing mixing, adding the water-based ultraviolet light absorber, the water-based oilfield fluorescent shielding agent, the substrate wetting agent and the levelling agent, adjusting viscosity by using the thickening agent to obtain the mixture of the group A, preparing the mixture of the group B, and mixing the mixtures of the group A and the group B before the topcoat is used.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a water-based two-component polyurethane topcoat with strong weather resistance and self-repairability and a preparation method thereof. Background technique [0002] Traditional solvent-based two-component polyurethane coatings have excellent properties such as low film-forming temperature, strong adhesion, good wear resistance, high hardness, chemical resistance, and weather resistance, and are widely used as parts of agricultural machinery and modified cars. , instruments, hardware components coating. However, with the continuous implementation and improvement of environmental protection policies and the continuous enhancement and improvement of consumers' awareness of environmental protection, traditional oil-based paints are gradually being replaced by environmentally-friendly paints. important parts of. Water-based paints are low in VOC content, non-toxic, and environmentally frie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/00
CPCC09D5/00C09D175/04
Inventor 马春福周泽钱胡中源董立志
Owner HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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