Moisture-absorption-resistant water-based polyurethane dispersion, and preparation method and application thereof

A polyurethane dispersion and tidal water technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy fogging, poor water resistance, and spots on the surface

Active Publication Date: 2020-08-21
XUCHUAN CHEM SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: The technical problem to be solved is to provide a moisture-absorbing water-based polyurethane dispersion to solve the problems in the prior art of water-based polyurethane coating resins such as poor water barrier, easy fogging or spots on the surface

Method used

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  • Moisture-absorption-resistant water-based polyurethane dispersion, and preparation method and application thereof
  • Moisture-absorption-resistant water-based polyurethane dispersion, and preparation method and application thereof

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preparation example Construction

[0054] A kind of preparation method of anti-moisture absorption aqueous polyurethane dispersion, concrete steps are as follows:

[0055](1) Put polyether diol, polyether polyol with functionality ≥ 3, side chain alkane diol and polyisocyanate into the reaction kettle, stir evenly, add catalyst and solvent, react at 60-100°C for 1-2h, Obtain PU prepolymer;

[0056] (2) Cool down the PU prepolymer obtained in step (1) to 65°C, add a hydrophilic chain extender, a polyol chain extender and a solvent, then raise the temperature to 60-90°C, and continue the reaction for 3-6h;

[0057] (3) cool down and add solvent to dilute;

[0058] (4) When the temperature drops below 35°C, add a neutralizing agent and neutralize for 10-30 minutes;

[0059] (5) under high-speed stirring, the PU prepolymer obtained in step (4) is dispersed in water to obtain a PU dispersion;

[0060] (6) The amine chain extender is prepared into an aqueous solution with a mass fraction of 5-40%, added to the PU ...

Embodiment 4

[0070] Surface component quality Function / manufacturer Waterborne Polyurethane Dispersion 95 Silok 8000 0.5 Wetting agent / Sloco Silok 8144 0.3 Leveling agent / Sloco UH-450VF 2 Thickener / Addico XWB-F115 0.3 Curing agent / Asahikawa KA-920 2 Color paste / Kaishiai

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Abstract

The invention relates to a moisture-absorption-resistant water-based polyurethane dispersion, and a preparation method and application thereof, and belongs to the field of water-based polyurethane coating resin. The preparation method comprises the following steps: reacting polyether glycol, polyether polyol with the functionality of more than or equal to 3, side-chain alkane glycol and polyisocyanate together to obtain a prepolymer, then adding a chain extender, and continuously reacting to obtain the moisture-absorption-resistant water-based polyurethane coating resin dispersion. A water-based polyurethane coating resin is prepared by utilizing the moisture-absorption-resistant water-based polyurethane coating resin dispersion. The finally prepared waterborne polyurethane coating resin has the characteristics of being capable of blocking water vapor, free of fogging when meeting moisture and the like.

Description

Technical field: [0001] The invention belongs to the technical field of water-based polyurethane coating resin, and in particular relates to a moisture-absorbing water-based polyurethane coating resin and its preparation method and application. Background technique: [0002] Waterborne polyurethane is widely used in coatings, adhesives, leather finishing agents and fabric coatings due to its non-toxic and environmentally friendly characteristics. The film-forming process of water-based polyurethane belongs to the fusion of multi-phase systems, which can well reflect its air and moisture permeability in the application field. However, when in use, liquids such as water, beverages, blood, and urine can easily penetrate into the back of the water-based polyurethane coating, making cleaning such as printing difficult. Therefore, improving the water-permeable and air-permeable properties of water-based polyurethane coatings can greatly expand the application of water-based polyu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/12C08G18/34C08G18/32C09D175/08
CPCC08G18/7614C08G18/7671C08G18/4812C08G18/4854C08G18/4825C08G18/12C08G18/34C08G18/32C09D175/08C08G18/348C08G18/3206C08G18/3228
Inventor 高强郭艳欣陈亚磊朱小强张大华
Owner XUCHUAN CHEM SUZHOU
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