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Water-based PU coating as well as preparation method and application thereof

A water-based paint technology, used in polyurea/polyurethane coatings, coatings, primers, etc., can solve the problems of poor adhesion and poor versatility of water-based paints and coatings, and achieve the best water resistance, fast drying speed, and high cross-linking. The effect of density

Pending Publication Date: 2021-11-30
HUNAN SOKAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a water-based PU coating and its preparation method and application to solve the technical problem that due to the poor versatility of the water-based paint coating, different water-based paint coatings can only be used for different composite plastic materials, and the adhesion is poor

Method used

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  • Water-based PU coating as well as preparation method and application thereof
  • Water-based PU coating as well as preparation method and application thereof
  • Water-based PU coating as well as preparation method and application thereof

Examples

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preparation example Construction

[0034] In this example, the preparation method of the water-based alkyd-acrylic acid hybrid oxidative drying resin includes the following steps: mixing the fatty acid-modified acrylic acid prepolymer and the alkyd prepolymer, and raising the temperature to 180°C under a nitrogen atmosphere to carry out the esterification reaction, Measure the acid value, when the acid value is lower than 25mgKOH / g, stop the reaction, cool down to 120°C, add ethylene glycol butyl ether, and continue to cool down to 80°C, add triethylamine, dilute with water until the solid content is lower than 50%, and obtain Waterborne alkyd acrylic hybrid oxidative drying resin.

[0035] In this embodiment, the thickener is an associative thickener with pseudoplastic fluid flow. And / or, the defoaming agent adopts polyether defoaming agent; and / or, the substrate wetting agent adopts modified polyether siloxane copolymer.

[0036] In this embodiment, non-ionic modified fatty acid derivative solution is used a...

Embodiment 1

[0052] Water-based PU coatings, the parts by weight of each component are shown in Table 1.

[0053] Table 1 The parts by weight of each component of waterborne PU coating

[0054]

[0055] Among them, the preparation method of the water-based alkyd-acrylic acid hybrid oxidative drying resin comprises the following steps: mixing the fatty acid-modified acrylic acid prepolymer and the alkyd prepolymer, raising the temperature to 180°C under a nitrogen atmosphere for esterification, and measuring the acid value , when the acid value is 25mgKOH / g, the reaction is terminated, the temperature is lowered to 120°C, ethylene glycol butyl ether is added, and the temperature is continued to be lowered to 80°C, triethylamine is added, and water is diluted to a solid content of 50% to obtain a water-based alkyd acrylic acid Oxygenated dry resin.

[0056] The preparation method of waterborne PU paint, comprises the following steps:

[0057] S1, mixing the water-based hyperbranched hyd...

Embodiment 2

[0064] Water-based PU coatings, the parts by weight of each component are shown in Table 2.

[0065] Table 2 The parts by weight of each component of waterborne PU coating

[0066]

[0067] The preparation method of waterborne PU coating is identical with embodiment 1.

[0068] For the application of water-based PU coating on PA+GF, the water-based PU coating is diluted with water, the mass ratio of PU coating to water is 100:10, and the water-based PU coating dilution is sprayed on the substrate of PA+GF, and the spraying air pressure is 3.5kgf / cm 2 , baked and cured at 70° C. for 110 minutes, the thickness of the formed paint film was 18 μm, and a paint film was obtained.

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Abstract

The invention discloses a water-based PU coating as well as a preparation method and application thereof. The water-based PU coating comprises a component A and a component B. The component B comprises an isocyanate curing agent; the component A comprises the following components in parts by weight: 40 to 50 parts of water-based hyperbranched hydroxyl polyester resin, 30 to 40 parts of water-based alkyd acrylic hybrid oxidation drying resin, 0.3 to 1.0 part of a water-based polyurethane thickening agent, 0.1 to 0.2 part of a de-foaming agent, 1.0 to 2.5 parts of a base material wetting agent, 0.2 to 0.5 part of a dispersing agent, 2 to 4 parts of matting powder, 0.5 to 1.0 part of a flatting agent, 4 to 8 parts of a cosolvent and 1 to 15 parts of water. According to the water-based PU coating disclosed by the invention, the water-based hyperbranched hydroxyl polyester resin and the water-based alkyd acrylic hybrid oxidation drying resin are matched for use, so that the water-based PU coating has excellent water resistance and weather resistance on a high polymer material, and also has excellent adhesive force on inorganic non-metal substrates such as glass, ceramics and the like.

Description

technical field [0001] The invention relates to the field of water-based paints, in particular to a water-based PU paint. In addition, the present invention also relates to a preparation method and application of the above-mentioned water-based PU coating. Background technique [0002] At present, oil-based paints are used for spraying on composite plastic materials in the market, but oil-based paints have high VOC content and cause great environmental pollution. In recent years, the total output of coatings has reached nearly 20 million tons, and VOC emissions have reached 5 million to 6 million tons. Moreover, VOC emissions are an important source of PM2.5. Therefore, oil-based coatings cannot meet the increasingly stringent environmental protection requirements. Therefore, it is urgent to develop water-based friendly coatings to replace the current high-VOC oil-based coatings to reduce VOC emissions. Water-based coatings use water as a solvent to reduce the pollution of...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D187/00C09D5/00C09D7/20C08G18/46C08G63/91C08G81/02C08J7/043C08L67/02C08L77/00C08L33/12C08L55/02
CPCC09D175/06C09D5/002C09D7/20C08G18/4692C08G63/91C08G81/027C08J7/0427C08J7/043C08J2475/06C08J2487/00C08J2367/02C08J2377/00C08J2333/12C08J2355/02C08L87/005
Inventor 邓磊乔曾煜凌云剑符饶生缪培凯
Owner HUNAN SOKAN NEW MATERIAL
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