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Preparation method of water-based polyacrylate modified polyurethane dispersion (PUD)

A polyurethane dispersion, polyacrylate technology, applied in the direction of polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of short application period and inconvenient coating

Inactive Publication Date: 2011-02-16
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Chinese patent CN 1597739A discloses a technology of pre-preparing PA emulsion, and then directly adding PA emulsion into PU prepolymer solution for dispersion. This method is easy to operate, and the obtained PA / PU miscellaneous microspheres have more excellent performance , however, according to this method, a large amount of volatile organic solvents must be used in the PU polymerization stage, and these solvents must be removed under reduced pressure in the final stage
[0022] Although the two-component system can obtain excellent coating performance, it is very inconvenient to apply this type of paint, and the two components must be kept separately, and must be mixed in a certain proportion when used, and the two components must be mixed in a certain proportion. The application period of the divided mixture is usually less than three hours

Method used

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  • Preparation method of water-based polyacrylate modified polyurethane dispersion (PUD)
  • Preparation method of water-based polyacrylate modified polyurethane dispersion (PUD)
  • Preparation method of water-based polyacrylate modified polyurethane dispersion (PUD)

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preparation example Construction

[0047] Preparation of Waterborne PA Modified PU Dispersion

[0048] In order to prepare aqueous PA / PU hybrid dispersions, some important factors that must be considered include: (i) the high viscosity of the PU prepolymer; (ii) the difficulty of free radical polymerization of the acrylate monomer in the presence of PU (iii) the mutual promotion of PA and PU properties; and (iv) the convenience of operation and the high yield of the production process.

[0049] To improve workability, it is best to avoid the polymerization of acrylates in the presence of PU. As we all know, acrylate emulsions have good design and controllability, including the particle size and particle size distribution of polymer emulsions, particle structure and morphology, etc. The engineering-friendly structure and performance of acrylate polymer emulsions are the reasons why many researchers and technicians to engage in their research. Through the emulsion polymerization of acrylate, it is easy to obt...

example

[0094] Commonly used araliphatic polyisocyanates include but are not limited to the following examples: m-tetramethylene xylylene diisocyanate, p-tetramethylene xylylene diisocyanate, 1,4-xylylene diisocyanate , 1,3-xylylene diisocyanate and the like. The most commonly used araliphatic polyisocyanate is tetramethylene xylylene diisocyanate.

[0095] Suitable aromatic polyisocyanates include, but are not limited to, the following examples: 4,4'-dibenzylidene diisocyanate, toluene diisocyanate and its isomers, naphthalene diisocyanate, and their oligomers and the like . The most commonly used aromatic polyisocyanate is toluene diisocyanate.

[0096] According to the present invention, hydroxycarboxylic acid is used as the water dispersion strengthening agent. In the preparation of PU prepolymer, the hydroxyl group will react with the isocyanate group and its carboxyl group will remain, so as to provide hydrophilicity for the PU molecular chain. Polyurethane is generally hydr...

Embodiment

[0120] The present invention can further illustrate technical details through the following examples, but it must be noted that the present invention is not limited to the scope involved in the following examples. In the following examples and detailed descriptions, all amounts measured in "parts" or percentages are parts by weight or ratios by weight, unless otherwise stated.

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PUM

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Abstract

The invention discloses a new method for preparing water-based polyacrylate modified polyurethane dispersion (PUD), which mainly comprises the following steps: (a) preparing an acrylate polymer or copolymer emulsion; (b) preparing a polyurethane prepolymer with carboxyl, and neutralizing the carboxyl; and (c) under the condition of high-speed stirring or other mechanical mixing, adding a polyacrylate emulsion into the polyurethane prepolymer for carrying out dispersion and chain extension. If unsaturated acetoacetate-based compounds are added when the polyacrylate emulsion is prepared, the prepared water-based polyacrylate modified PUD has self-crosslinking property.

Description

technical field [0001] The invention relates to the preparation of a waterborne polyurethane dispersion. In particular, the present invention relates to a method for preparing water-based polyacrylate modified polyurethane dispersion without using volatile solvents, and further includes analyzing the products produced by the method, and the modified polyurethane dispersion The body can be used in coatings, especially wood coatings, adhesives and inks and other industrial fields. Background technique [0002] For decades, efforts have been made to reduce air pollution caused by volatile solvents in paint application. Due to the increasing environmental concerns, volatile organic compounds (VOCs) are being controlled by strict regulations from various governments. Therefore, the main goal of the paint and coatings industry is to reduce the amount of organic solvents used by replacing paints with water-based paint formulations that can obtain smoothness, high gloss, and good ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09J175/04C08G18/10C08G18/62C09D11/10C09D11/102
Inventor 袁才登陈国华张西祥李宗津刘治猛
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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