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Bi-component waterborne polyurethane coating composition

A water-based polyurethane, two-component technology, applied in the direction of polyurea/polyurethane coatings, coatings, layered products, etc., can solve the problems that cannot be cured into a film, and there are no reports of two-component water-based polyurethane coatings.

Active Publication Date: 2014-05-07
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101397475 discloses a preparation method of polyurethane high-temperature-resistant long-acting anti-corrosion coating, but it belongs to solvent-based polyurethane system, and its evaluated performance does not involve high-temperature yellowing performance; CN1629234 discloses a high-gloss high-temperature resistant silicon-acrylic polyurethane Coating and its preparation method, but the selected resin is silicone-modified acrylic resin, the curing agent is HDI, and does not involve specific measures for high-temperature yellowing resistance
Another example is CN101481578A which discloses a capacitor coating with deep drawing resistance and high temperature non-yellowing and a preparation method thereof, but it belongs to a solvent-based polyurethane system, and a closed polyisocyanate is selected as a curing agent, which belongs to the scope of baking varnish and cannot be used at room temperature. Under curing film
[0004] Therefore so far there is no report on the two-component waterborne polyurethane coating with high temperature yellowing resistance

Method used

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  • Bi-component waterborne polyurethane coating composition

Examples

Experimental program
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Embodiment

[0069] The present invention is further described below in conjunction with specific examples. However, it should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. The test methods that do not indicate specific conditions in the following examples are usually carried out according to conventional conditions, or according to the conditions suggested by the manufacturer. All percentages and parts are by weight unless otherwise indicated.

[0070] The raw materials mentioned in this text are shown in the table below.

[0071]

[0072]

[0073]

[0074] In each embodiment of the present invention, the high temperature yellowing resistance and other properties of the coating film prepared from the coating composition of the present invention were tested, as shown in Table 1 below. In Table 1, each test item and the corresponding test standard or method, the selection and pretreatment o...

Embodiment E1

[0111] Preparation of Component A

[0112]Put 50.00g Baydrol A2227 / 1 into the mixer container, stir at 1200rpm, slowly add 0.10g Borchi-Gel PW25, 0.2g BYK024, 0.7g TEGO Dispers752W, 13.8g R960, 5.45g deionized water, and then Increase the stirring speed to 3000rpm, and maintain this speed to disperse for 25 minutes. At this time, check the fineness. If the fineness is ≤15μm, stop high-speed dispersion; if the fineness is >15μm, continue high-speed dispersion until the fineness is ≤15μm. . When the fineness is ≤15μm, reduce the stirring speed to 1000rpm, slowly add 0.6g BYK348, and keep stirring at this speed for 5 minutes to complete the preparation of component A.

[0113] Component A was filtered through a 400-mesh filter and stored in a sealed container for 24 hours before use.

[0114] Preparation of Component B

[0115] Component B is Bayhydur XP2759, which is a sulfamate-modified isophorone diisocyanate (IPDI) polymer, diluted with MPA at a ratio of curing agent:MPA=3...

Embodiment E2

[0123] Preparation of Component A

[0124] Put 50.00g Baydrol A2227 / 1 into the mixer container, stir at 1200rpm, slowly add 0.10g Borchi-Gel PW25, 0.2g BYK024, 0.7g TEGODispers752W, 13.8g R960, 5.45g deionized water, and then increase Stir the speed to 3000rpm, and maintain this speed to disperse for 25 minutes. At this time, check the fineness. If the fineness is ≤15μm, stop the high-speed dispersion; if the fineness is >15μm, continue the high-speed dispersion until the fineness is ≤15μm. When the fineness is ≤15μm, reduce the stirring speed to 1000rpm, slowly add 0.6g BYK348, and keep stirring at this speed for 5 minutes to complete the preparation of component A.

[0125] Component A was filtered through a 400-mesh filter and stored in a sealed container for 24 hours before use.

[0126] Preparation of Component B

[0127] Component B is Bayhydur XP401-70, which is a polyether-modified isophorone diisocyanate (IPDI) polymer, diluted with MPA at the rate of curing agent / M...

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Abstract

The invention relates to a bi-component waterborne polyurethane coating composition. The bi-component waterborne polyurethane coating composition comprises a component (a) and a component (b), wherein the component (a) comprises one or more polyol waterborne dispersions or waterborne emulsion, the content of hydroxy in the polyol is 0.5-5.5 wt.% based on the situation that the weight of the polyol is weighted by 100 wt.%, and the solid content of the polyol waterborne dispersion or the waterborne emulsion is 10-70 wt.% based on the situation that the total weight of the polyol waterborne dispersion or the waterborne emulsion is weighted by 100 wt.%; the component (b) comprises one or more hydrophilic modified isophorone diisocyanate polymers or prepolymers; due to the contents of the component (a) and the component (b), the equivalence ratio of an NCO group to the hydroxy in the bi-component waterborne polyurethane coating composition is 0.2:1 to 5:1. The bi-component waterborne polyurethane coating composition has high temperature yellowing resistance, and the chromatism value of a coating film prepared from the coating composition is less than 3.0 after the coating film is baked at the temperature of 150 DEG C for 1 day.

Description

technical field [0001] The invention relates to a two-component waterborne polyurethane coating composition, in particular to a waterborne polyurethane coating composition containing isophorone diisocyanate multimer or prepolymer. Background technique [0002] Two-component polyurethane coatings generally consist of a curing agent component containing isocyanate functional groups and a paint component containing hydroxyl or amine functional groups. Two-component polyurethane coatings can generally be divided into solvent-based polyurethane coatings and water-based polyurethane coatings. Waterborne polyurethane coatings, especially two-component waterborne polyurethane coatings, not only retain the excellent performance of solvent-based polyurethane coatings, but also have good environmental friendliness, so they have broad application prospects. [0003] Two-component waterborne polyurethane coatings are prone to yellowing under long-term (≥24h) baking at high temperatures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D175/14C09D175/06B32B27/40
CPCC08G18/42C09D175/06C08G18/6254C09D175/04C08G18/10C08G18/706C08G18/0828C08G18/44C08G18/6229C08G18/775
Inventor 张之涵沈剑平范子琦
Owner COVESTRO DEUTSCHLAND AG
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