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High-gloss high-DOI waterborne polyurethane coating as well as preparation method and application thereof

A water-based polyurethane, high-gloss technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of orange peel, poor fullness, and high haze

Inactive Publication Date: 2020-06-23
山东七维新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of existing water-based two-component polyurethane coatings such as poor fullness, heavy orange peel, and high haze, the present invention provides a new solution by screening the main resin, auxiliary agents and auxiliary solvents, and selecting the ratio of raw materials. A kind of waterborne polyurethane coating with high gloss and high DOI and its preparation method and application

Method used

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  • High-gloss high-DOI waterborne polyurethane coating as well as preparation method and application thereof
  • High-gloss high-DOI waterborne polyurethane coating as well as preparation method and application thereof
  • High-gloss high-DOI waterborne polyurethane coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A high gloss and high DOI polyurethane coating, the coating includes A component and B component,

[0039] Component A consists of the following raw materials: aqueous hydroxyacrylic dispersion (Bayhydrol xp 2470 from Covestro), aqueous polyester dispersion (NECOWEL 720 from ASK Chemicals GmbH), co-solvents, additives, pigments (Clariant) and deionized water,

[0040] Wherein, cosolvent comprises low boiling point cosolvent (BCS), middle boiling point cosolvent (DPM) and high boiling point cosolvent (DPnB),

[0041] Additives include pH adjuster (DMEA), dispersant (BYK 2012), non-silicon leveling agent (wet510 from Tego), defoamer (BYK 011) and thickener (299 from Hemingstec) ;

[0042] Component B includes raw materials: water-based isocyanate and PGDA solvent;

[0043] The dosage of each raw material of component A and component B is shown in Table 1 below;

[0044] The preparation method of present embodiment coating comprises the steps:

[0045] S1: Preparation...

Embodiment 2

[0051] A high gloss and high DOI polyurethane coating, the coating includes A component and B component,

[0052] Component A includes the following raw materials: water-based hydroxyl acrylic dispersion (Bayhydrol xp 2470 from Covestro), water-based polyester dispersion (NECOWEL 720 from ASK Chemicals GmbH), co-solvents, additives, pigments (Yipin) and deionized water ,

[0053] Wherein, cosolvent comprises low boiling point cosolvent (BCS), medium boiling point cosolvent (PGDA) and high boiling point cosolvent (DPnB),

[0054] Auxiliaries include pH adjuster (DMEA), dispersant (DEGO’s 755W), non-silicon leveling agent (Euca’s 350W), defoamer (BYK 011) and thickener (OMG’s 0434);

[0055] Component B includes raw materials: water-based isocyanate and PGDA solvent;

[0056] The dosage of each raw material of component A and component B is shown in Table 1 below;

[0057] The preparation method of the coating of this embodiment is the same as that of Example 1.

Embodiment 3

[0059] A high gloss and high DOI polyurethane coating, the coating includes A component and B component,

[0060]Component A consists of the following raw materials: aqueous hydroxyacrylic dispersion (Bayhydrol xp 2470 from Covestro), aqueous polyester dispersion (NECOWEL 720 from ASK Chemicals GmbH), co-solvents, additives, pigments (Clariant) and deionized water,

[0061] Wherein, cosolvent comprises low boiling point cosolvent (BCS), middle boiling point cosolvent (DPM) and high boiling point cosolvent (DPnB),

[0062] Additives include pH adjuster (DMEA), dispersant (BYK 2012), non-silicon leveling agent (wet510 from Tego), defoamer (BYK 011) and thickener (299 from Hemingstec) ;

[0063] Component B includes raw materials: water-based isocyanate and PGDA solvent;

[0064] The dosage of each raw material of component A and component B is shown in Table 1 below;

[0065] The preparation method of the coating of this embodiment is the same as that of Example 1.

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Abstract

The invention relates to the technical field of water-based paint, in particular to a high-gloss high-DOI waterborne polyurethane coating and a preparation method and application thereof. The coatingcomprises a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight: 40-50 parts of water-based hydroxyl acrylic acid dispersion, 15-25 parts of water-based polyester dispersion, 5-8 parts of cosolvent, 3.5-4.5 parts of auxiliaries, 4-25 parts of pigment and 6.5-19 parts of deionized water. The component B is prepared from the following raw materials in parts by weight: 17.5 to 20 parts of waterborne isocyanate and 5 to 7.5 parts of a PGDA solvent. The water-based hydroxyl acrylic acid dispersion is matched with the water-based polyester dispersion to serve as matrix resin, and the leveling property and DOI value of a paint film are improved on the premise that weather resistance, chemical resistance, dryness and the like are guaranteed.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a high-gloss and high-DOI water-based polyurethane coating and its preparation method and application. Background technique [0002] In recent years, with the increase of environmental protection, water-based coatings have flourished. In the field of medium and light anti-corrosion, the proportion of water-based industrial coatings has also doubled year by year. In the future, water-based coatings are expected to become the mainstream in the field of medium and light anti-corrosion. [0003] However, the application of water-based 2K PU coatings in fields with high appearance requirements, such as construction machinery, rail transit or buses, is greatly limited due to its disadvantages such as poor fullness, heavy orange peel, and high haze. [0004] Based on this, the present invention provides a waterborne polyurethane coating with high gloss and high DOI, its p...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D7/20C09D7/47C08G18/42C08G18/62
CPCC08G18/4063C08G18/42C08G18/6216C09D175/06C09D7/20C09D7/47
Inventor 杨栋磊姜凤冕
Owner 山东七维新材料有限公司
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