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Preparation method of aqueous polyurethane emulsion for synthetic leather

A technology of water-based polyurethane and synthetic leather, which is applied in textiles, papermaking, fiber treatment, etc., can solve the problems of reducing hydrolysis resistance and achieve the effect of improving water resistance

Active Publication Date: 2012-10-03
TAIZHOU HONGDELI RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also the use of hydrophilic hydroxycarboxyl groups to neutralize tertiary amines, and then adding di- or tri-functional amines to extend the chain of isocyanate groups remaining after dispersion and emulsification in water and polymerize them, but this will reduce hydrolysis resistance

Method used

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  • Preparation method of aqueous polyurethane emulsion for synthetic leather
  • Preparation method of aqueous polyurethane emulsion for synthetic leather
  • Preparation method of aqueous polyurethane emulsion for synthetic leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 50g PTMEG1000, 10g PPG1000, 1.24g EG, 0.4g TMP, 6.7g DMPA, 12.53g NMP into the reactor equipped with a stirrer, thermometer, and reflux condenser, heat up to 80°C, heat to dissolve for 30 minutes, then add 44.4g IPDI, 0.01 g of T-9, reacted at 80° C. for 5 hours under stirring to obtain a prepolymer. Cool down to 60°C, add 5g of triethylamine to neutralize the prepolymer into salt, keep stirring for 20 minutes, then add 233.72g of deionized water under high-speed shear, add water to emulsify and disperse for 30 minutes, and then add 18g of Dilute the amine for chain extension with 10% water and stir for 30 minutes after the addition to obtain an emulsion.

Embodiment 2

[0033] Add 50g PCL2000, 50g PTMEG1000, 0.5g TMP, 6.7g DMPA, 26.75g NMP into the reactor equipped with a stirrer, thermometer, and reflux condenser, heat up to 80°C, add 44.4g IPDI, 0.01g after heating and dissolving for 30 minutes T-9, react at 87°C for 5 hours under stirring to obtain a prepolymer. Then lower the temperature to 60°C, add 5g of triethylamine to neutralize the prepolymer into salt, keep stirring for 20 minutes, then add 282.14g of deionized water under high-speed shearing, add water to emulsify and disperse for 30 minutes, and then add 59.5g of Dilute the amine for chain extension with 10% water, and stir for 30 minutes after the addition to obtain an emulsion.

Embodiment 3

[0041]Add 15g PTMEG1000, 60g PCL2000, 15g PPG1000, 0.62g EG, 0.4g TMP, 6.7g DMPA, 25.08g NMP into a reactor equipped with a stirrer, a thermometer, and a reflux condenser, heat up to 80°C, and heat to dissolve for 30 minutes Add 44.4g of IPDI, 0.015g of T-9, and react under stirring at 96°C for 5 hours to obtain a prepolymer. Then cool down to 60°C, add 5g of triethylamine to neutralize the prepolymer into salt, keep stirring for 20 minutes, then add 276.8g of deionized water under high shear and add water to emulsify and disperse for 30 minutes, then add 24g of 10 % water to dilute the amine for chain extension, and stir for 30 minutes after the addition to obtain an emulsion.

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Abstract

The invention discloses a preparation method of an aqueous polyurethane emulsion for synthetic leather. The preparation method comprises the following steps of: mixing macromolecular polybasic alcohol, small molecular polybasic alcohol, hydrophilic hydroxy carboxylic acid, diisocyanate and a solvent, wherein the molar quantity of the hydroxyl group in the mixture accounts for 1-5 percent of the total amount of the molar quantities of macromolecular polybasic alcohol, the small molecular polybasic alcohol and the hydrophilic hydroxy carboxylic acid; adding a catalyst after mixing; reacting at the temperature of 80-110 DEG C for 2-6 hours to obtain prepolymer; and reducing the temperature to 60-80 DEG C, adding a chain extender and reacting to obtain the emulsion. The aqueous polyurethane emulsion is prepared by mixing and reacting the macromolecular polybasic alcohol, the small molecular polybasic alcohol, the hydrophilic hydroxy carboxylic acid and the diisocyanate under specific operation conditions according to a certain proportion, adding triethylamine to neutralize the carboxyl group and then adding water to emulsify, wherein a certain amount of trihydric alcohol is used in the small molecular polybasic alcohol; and the water resistance, the solvent resistance and the heat resistance of the aqueous polyurethane emulsion for synthetic leather are improved.

Description

technical field [0001] The invention relates to the technical field of synthetic leather manufacture, in particular to a preparation method of an aqueous polyurethane emulsion for synthetic leather. Background technique [0002] Polyurethane has many uses in the fields of coatings, adhesives, and artificial leather. Among them, in the current synthetic leather industry, organic solvent-based resins are generally used in large quantities, causing air pollution, environmental pollution, and damage to the operating environment. Increase the risk, and at the same time this accompanying solvent evaporation has also resulted in a waste of resources. [0003] At present, in order to improve these problems, as early as 10 years ago, various places have carried out the development and research of water-based polyurethane resin. Some of them have been used in actual production, but they cannot reach the performance and quality of solvent-based polyurethane resins. In particular, dis...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/44C08G18/32C08G18/34C08G18/12D06M15/568D06M15/572
Inventor 张晓隆姚克俭石堰
Owner TAIZHOU HONGDELI RESIN
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