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Method for preparing sulfoacid/carboxylic acid waterborne polyurethane

A technology of waterborne polyurethane and carboxylic acid type, which is applied in the field of preparation of sulfonic acid/carboxylic acid type waterborne polyurethane, can solve the problems of single type and performance, and achieve the effects of high product yield, simple process route, and regularity protection

Inactive Publication Date: 2012-09-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a preparation method of sulfonic acid / carboxylic acid type water-based polyurethane, which solves the problem that the type and performance of the current anionic water-based polyurethane resin are single

Method used

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  • Method for preparing sulfoacid/carboxylic acid waterborne polyurethane
  • Method for preparing sulfoacid/carboxylic acid waterborne polyurethane
  • Method for preparing sulfoacid/carboxylic acid waterborne polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 2.5mol of toluene diisocyanate (435g) and 1mol of polycaprolactone diol (2000g) with a molecular weight of 2000 to a reactor equipped with a stirrer, reflux condenser, nitrogen protection, and temperature indication, and add 1.2g of catalyst Bicat8108 (20%Bi) was reacted at 80°C for 1.5h to obtain product A;

[0027] (2) Add 36.5g of sulfonic acid / carboxylic acid type hydrophilic chain extender and 6.2g of ethylene glycol chain extender into the reactor, add an appropriate amount of acetone into the reactor according to the viscosity (viscosity control is not greater than 20000CPS), React at 70°C for 3 hours to obtain product B (waterborne polyurethane hydrophilic prepolymer). The molecular structure of the sulfonic acid / carboxylic acid type hydrophilic chain extender is as follows:

[0028]

[0029] (3) Cool the product B (hydrophilic prepolymer of water-based polyurethane) to below 50°C, add it into 2500g of water for dispersion under high-speed stirring, a...

Embodiment 2

[0032] (1) Add 2mol of 4,4-diphenylmethane diisocyanate (500g) and 1mol of polytetrahydrofuran diol (2000g) with a molecular weight of 2000 into a reactor equipped with a stirrer, reflux condenser, nitrogen protection, and temperature indication , adding 1.25g of catalyst and reacting at 85°C for 1h to obtain product A;

[0033] (2) Add 75g of sulfonic acid / carboxylic acid type hydrophilic chain extender and 9g of 1,4-butanediol chain extender to the reactor, and add an appropriate amount of acetone into the reactor according to the viscosity (viscosity control is not greater than 20000CPS), React at 75°C for 2 hours to obtain product B (waterborne polyurethane hydrophilic prepolymer). The molecular structure of the sulfonic acid / carboxylic acid type hydrophilic chain extender is as follows:

[0034]

[0035] (3) Cool the product B (hydrophilic prepolymer of waterborne polyurethane) to below 50°C, add it to 3800g of water for dispersion under high-speed stirring, add 3.8g o...

Embodiment 3

[0038] (1) Add 3mol of 1,6-hexyl diisocyanate (505g) and 1mol of polyoxypropylene diol (1000g) with a molecular weight of 1000 into a reactor equipped with a stirrer, reflux condenser, nitrogen protection, and temperature indication , add 0.75g of catalyst, react at 90°C for 2h, and obtain product A;

[0039] (2) Add 60g of sulfonic acid / carboxylic acid type hydrophilic chain extender, 25g of ethylene glycol, and 36g of 1,4-butanediol into the reactor, and add an appropriate amount of butanone according to the viscosity (viscosity control is not greater than 20000CPS) Put into the reactor and react at 85°C for 4 hours to obtain product B (waterborne polyurethane hydrophilic prepolymer). The molecular structure of the sulfonic acid / carboxylic acid type hydrophilic chain extender is as follows:

[0040]

[0041] (3) Cool the product B (hydrophilic prepolymer of waterborne polyurethane) to below 50°C, add it into 1100g of water to disperse under high-speed stirring, add 2g of ...

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Abstract

The invention discloses a method for preparing sulfoacid / carboxylic acid waterborne polyurethane. The method comprises the following steps of: reacting polyisocyanates with polymer polyol at the temperature between 80 and 100 DEG C, thus obtaining a product A; reacting A with a sulfoacid / carboxylic acid hydrophilic chain extender and a small-molecule chain extender at the temperature between 70 and 100 DEG C, thus obtaining a product B, cooling the product B, adding the product B into water in a stirring state for dispersing, adding an antifoaming agent into the mixture, thus obtaining a product C; and finally performing reduced pressure distillation on the product C at the temperature being below 50 DEG C for removing a cosolvent, thus obtaining the sulfoacid / carboxylic acid waterborne polyurethane. According to the method, sulfo group and carboxylic acid group are introduced into a polyurethane molecular main chain for one time, so that the sulfoacid / carboxylic acid waterborne polyurethane has the characteristics of sulfoacid waterborne polyurethane and carboxylic acid waterborne polyurethane; a waterborne polyurethane prepolymer can be emulsified and dispersed in water, the high solid content of a product is realized easily; the regularness of a polyurethane resin chain is protected; and the sulfoacid / carboxylic acid waterborne polyurethane has the advantages of simpleness in process line and high product yield.

Description

technical field [0001] The invention belongs to the field of waterborne polyurethane synthesis, and in particular relates to a preparation method of sulfonic acid / carboxylic acid type waterborne polyurethane. Background technique [0002] With the progress and development of society, people pay more and more attention to the awareness of environmental protection. Due to the large amount of organic solvents used in the production process of traditional solvent-based polyurethane resins, it is very harmful to the environment and human health. Compared with solvent-based polyurethane resin, water-based polyurethane resin greatly reduces the use of organic solvents and discharge to the natural environment, reduces the harm to the environment and human health, and also causes waste of resources and energy. The market should look ahead. The research on waterborne polyurethane resin in my country started in 1972, which started relatively late. After decades of development, some p...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/32C08G18/10
Inventor 王学川张哲强涛涛
Owner SHAANXI UNIV OF SCI & TECH
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