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Waterborne polyurethane emulsion, coating and preparation method and application of waterborne polyurethane emulsion

A technology of water-based polyurethane and emulsion, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problems of chemical reagent corrosion, limit the application of water-based polyurethane, poor stability and water resistance, etc.

Inactive Publication Date: 2020-05-12
广州康狄夫环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coatings, adhesives and other products made of traditional waterborne polyurethanes have poor stability and water resistance, and are easily corroded by chemical reagents, which largely limit the application of waterborne polyurethanes.

Method used

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  • Waterborne polyurethane emulsion, coating and preparation method and application of waterborne polyurethane emulsion
  • Waterborne polyurethane emulsion, coating and preparation method and application of waterborne polyurethane emulsion
  • Waterborne polyurethane emulsion, coating and preparation method and application of waterborne polyurethane emulsion

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preparation example Construction

[0054] Another embodiment of the present invention also provides a kind of preparation method of aqueous polyurethane emulsion, and this preparation method comprises the steps:

[0055] Compounding polyol, isocyanate, catalyst, hydrophilic chain extender, end-capping agent, neutralizing agent and water according to the mass parts in the above-mentioned aqueous polyurethane emulsion;

[0056] Mix polyol, isocyanate and catalyst, and stir at a temperature of 70°C to 95°C for 2h to 5h;

[0057] Cool down to 60°C-70°C, add hydrophilic chain extender, and stir at 60°C-75°C for 1h-3h;

[0058] Add an end-capping agent, and stir at a temperature of 60°C to 75°C for 0.1h to 0.5h, then add a neutralizing agent;

[0059] Cool down to 40°C-60°C, add 95-105 parts by mass of solvent, and stir for 0.1h-1h to obtain a prepolymer;

[0060] Disperse the prepolymer in water at 8°C to 12°C to obtain a pre-finished product of water-based polyurethane emulsion;

[0061] Removal of solvents from...

Embodiment 1

[0077] In this embodiment, the polyol A is a carbon dioxide copolymer polyol, the number average molecular weight of the carbon dioxide copolymer polyol is 3000 g / mol, and the hydroxyl functionality is 2.

[0078] In this embodiment, the polyol B is a mixture of polycarbonate diol, polybutylene adipate diol and polytetrahydrofuran diol. Wherein the number average molecular weight of polycarbonate diol is 2000g / mol, and the hydroxyl functionality is 2; The number average molecular weight of polybutylene adipate diol is 3000g / mol, and the hydroxyl functionality is 2; Polytetrahydrofuran diol has a number average molecular weight of 2000 g / mol and a hydroxyl functionality of 2.

[0079] The isocyanate in this embodiment is isophorone diisocyanate. The catalyst is an organic bismuth catalyst. The hydrophilic chain extender is dimethylolpropionic acid. The capping agent is trimethylolpropane. The neutralizing agent is triethylamine. Water is deionized water. The solvent is ac...

Embodiment 2

[0089] In this embodiment, the polyol A is a carbon dioxide copolymer polyol, the number average molecular weight of the carbon dioxide copolymer polyol is 3000 g / mol, and the hydroxyl functionality is 2.

[0090] In this embodiment, the polyol B is a mixture of polycarbonate diol, polybutylene adipate diol and polytetrahydrofuran diol. Wherein the number average molecular weight of polycarbonate diol is 2000g / mol, and the hydroxyl functionality is 2; The number average molecular weight of polybutylene adipate diol is 3000g / mol, and the hydroxyl functionality is 2; Polytetrahydrofuran diol has a number average molecular weight of 2000 g / mol and a hydroxyl functionality of 2.

[0091] The isocyanate in this embodiment is isophorone diisocyanate. The catalyst is an organic bismuth catalyst. The hydrophilic chain extender is dimethylolbutyric acid. The capping agent is trimethylolpropane. The neutralizing agent is triethylamine. Water is deionized water. The solvent is acet...

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Abstract

The invention relates to a waterborne polyurethane emulsion, a coating and a preparation method and application of the waterborne polyurethane emulsion. The waterborne polyurethane emulsion is mainlyprepared from the following components (by mass): polyols, isocyanate, a catalyst, a hydrophilic chain extender, an end-capping reagent, a neutralizer and water, wherein the polyols comprise a polyolA and a polyol B; the polyol A is carbon dioxide copolymer polyol, and the polyol B is at least one of polycarbonate diol, polybutylene adipate diol and polytetrahydrofuran diol. The preparation method comprises the following steps: mixing polyol A and polyol B for use; and matching isocyanate, a catalyst, a hydrophilic chain extender, an end-capping reagent, a neutralizer and water and controlling the mass parts of all the components. Thereby, the microphase separation of the waterborne polyurethane emulsion and the interaction between hydrogen bonds can be improved, and the waterborne polyurethane has good stability, water resistance and chemical reagent corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a water-based polyurethane emulsion, a paint and a preparation method and application thereof. Background technique [0002] With the rapid development of the economy, more and more materials have been prepared and widely used. The development and use of new materials have brought great convenience to people's lives, but the resulting environmental pollution problems are also increasing. serious. For example, the use of solvent-based coatings and solvent-based adhesives produces a large amount of volatile organic compounds (VOC), which has brought serious adverse effects on the environment. Therefore, the use of solvent-based coatings and solvent-based adhesives is being gradually restricted nationwide. Compared with solvent-based coatings and solvent-based adhesives, water-based polyurethane has the advantages of being environmentally friendly, good toughness, and hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/44C08G18/48C08G18/42C08G18/34C08J3/07C09D175/04C09D161/20C09D5/08
CPCC08G18/348C08G18/4018C08G18/4238C08G18/44C08G18/4854C08G18/6611C08G18/6625C08G18/755C08J3/07C09D5/08C09D175/04C08L61/20
Inventor 丁鹄岚李鸿越李炯
Owner 广州康狄夫环保科技有限公司
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