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Method for preparing solvent-free aqueous polyurethane dispersion

A technology of water-based polyurethane and dispersion, which is applied in the preparation of dispersion system and the preparation of solvent-free water-based polyurethane aqueous dispersion. It can solve the problems of high viscosity of prepolymer and high equipment requirements, and achieve the effect of simplifying the process and reducing the cost of formula

Inactive Publication Date: 2012-10-03
惠州市汉诺新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies all have the disadvantages of very high viscosity of the prepolymer and high requirements for equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 200g of dehydrated polytetrahydrofuran polyether PTMEG (molecular weight 2000), 15g of dimethylolpropionic acid (DMPA), and 85g of isophoronediamine (IPDI) into a 1000M three-necked flask equipped with a thermometer, heating and stirring device , organic bismuth catalyst (effective bismuth 20%) 0.2g, stirred and reacted at 95±2°C for 3 hours under nitrogen protection; cooled to 80°C, added 90g of 80°C deionized water, stirred at 600r / min for 5 minutes, and then Add a mixture of 11g triethylamine (TEA) and 300g room temperature water under stirring at 1000r / min, and stir for 10 minutes to obtain a translucent uniform emulsion; add 22g of isophoronediamine (IPDI) and 70g of room temperature under stirring at 1100r / min Stir the mixture of warm water for 10 minutes, finally raise the temperature to 50±2°C, and stir at 650r / min for 1 hour; cool to room temperature, filter and discharge to obtain a translucent water-based polyurethane dispersion with a solid content of 40....

Embodiment 2

[0025] Add 200g of dehydrated polytetrahydrofuran polyether PTMEG (molecular weight 2000), 15g of dimethylolpropionic acid (DMPA), and 100g of dicyclohexylmethane diisocyanate (HMDI) into a 1000Ml three-necked flask equipped with a thermometer, heating and stirring device , organic bismuth catalyst (effective bismuth 20%) 0.2g, stirred and reacted at 95±2°C for 3 hours under nitrogen protection. Cool to 80°C, add 90g of deionized water at 80°C, stir at a stirring speed of 600r / min for 5 minutes, add a mixture of 11g of triethylamine (TEA) and 300g of room temperature water under stirring at 1200r / min, and stir for 10 minutes to obtain Translucent homogeneous emulsion; add a mixture of 22g isophoronediamine (IPDI) and 70g room temperature water under the stirring condition of 1200r / min, stir for 10 minutes, and finally raise the temperature to 50±2°C, and stir for 1 hour at 650r / min ; Cool to room temperature, filter and discharge to obtain a translucent water-based polyurethan...

Embodiment 3

[0027] Add 200g of dehydrated polyoxypropylene glycol (GE220, molecular weight 2000), 10g of 1,4-butanediol, and 15g of dimethylol propionic acid (DMPA) into a 1000Ml three-necked flask equipped with a thermometer, heating and stirring device , 100g of 1,6-hexamethylene diisocyanate (HDI), 0.2g of organic bismuth catalyst (20% effective bismuth), stirred and reacted at 95±2°C for 3 hours under nitrogen protection. Cool to 80°C, add 80g of deionized water at 80°C, stir for 5 minutes at a stirring speed of 600r / min, add a mixture of 11g of triethylamine (TEA) and 480g of room temperature water under stirring at a stirring speed of 1000r / min, and stir A translucent homogeneous emulsion was obtained in 10 minutes. Add a mixture of 30g isophoronediamine (IPDI) and 100g room temperature water under stirring condition of 1200r / min, stir at 600r / min for 10 minutes, and finally raise the temperature to 55±2°C and stir at low speed for 1 hour. Cool to room temperature, filter and disch...

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Abstract

The invention relates to a method for preparing solvent-free aqueous polyurethane dispersion, and aims to provide the method for preparing the aqueous polyurethane dispersion without using complex solubilizer and solvent during the preparing process; the technical key points of the method sequentially comprises the following steps of: 1) preparing prepolymer which contains end isocyanate group; 2) adding 20-50% of hot water at the temperature of 60-90 DEG C, and stirring for 3-10 minutes; 3) uniformly mixing tertiary amine which accounts for 1-5% of the mass of the prepolymer with water which accounts for 40-60% of the mass of the prepolymer, adding the material which is obtained in step 2) under the stirring condition, and continuously stirring for 10-30 minutes; and 4) uniformly mixing amine chain extender which accounts for 1-5% of the mass of the prepolymer with the water which accounts for 5-15% of the mass of the prepolymer, adding the material which is obtained in the step 3) into the mixture under the stirring condition, and stirring for 60-120 minutes at the temperature of 40-60 DEG C, thus obtaining the solvent-free aqueous polyurethane dispersion. The method belongs to the technical field of the production of a chemical disperse system.

Description

technical field [0001] The invention relates to a method for preparing a dispersion system, in particular to a method for preparing a solvent-free aqueous polyurethane dispersion, and belongs to the technical field of chemical dispersion system preparation. Background technique [0002] The traditional way of preparing water-based polyurethane is to prepolymerize alcohols, polyols and diisocyanates containing carboxyl hydrophilic groups in a small amount of high-boiling point organic solvents as co-solvents, and then neutralize them with tertiary amines. The polymer has an ionic type, so it has hydrophilicity. Dilute the ionic prepolymer with an appropriate amount of solvent, disperse it in water for emulsification and chain extension reaction, and obtain a water-based polyurethane-polyurea dispersion or a multi-component polyurea dispersion. Alcohol and diisocyanate prepolymerization reaction, add a large amount of low boiling point solvent, carry out chain extension emulsi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G18/12
Inventor 张卫东吕钱江
Owner 惠州市汉诺新材料有限公司
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