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A kind of method for preparing aqueous polyurethane dispersion without organic solvent

A water-based polyurethane and organic solvent technology, which is applied in the field of water-based polyurethane material synthesis to achieve the effects of low energy consumption, low preparation temperature and environmental protection in the preparation process

Active Publication Date: 2021-12-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changing polyurethane production equipment requires a large investment

Method used

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  • A kind of method for preparing aqueous polyurethane dispersion without organic solvent

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Effect test

Embodiment 1

[0063] Add 12.75g of polycarbonate diol with a number average molecular weight of 2000, 19.99g of polycarbonate diol with a number average molecular weight of 1000, and 1.00g of dimethylol butyric acid into a three-necked flask equipped with an air guide tube, a stirrer and a thermometer , vacuum dehydration at 80°C for 2 hours, cooled to below 70°C, added 11.04g of IPDI (isophorone diisocyanate), about 0.03g of organic bismuth catalyst, and reacted at 60-65°C until the NCO% was less than or equal to the theoretical value, and obtained Viscous liquid, cool to 55°C, add 0.79g triethylamine, stir for 10-15 minutes, after the material is uniform, set the stirring speed to 1500-3000 rpm, add 1.78g ethylenediaminoethanesulfonic acid A mixed solution of sodium (50% aqueous solution) and 33g of water was reacted at 50°C for 1.5 hours to obtain a white emulsion, and a mixed solution of 0.56g of ethylenediamine and 7.90g of water was added and reacted at 50°C and 1000-1500 rpm for 1 hou...

Embodiment 2

[0065] Add 30.00 g of polytetrahydrofuran diol with a number average molecular weight of 2000, 3.01 g of polypropylene glycol glycidyl ether with a number average molecular weight of 3000, and 1.01 g of dimethylol butyric acid into a three-necked flask equipped with an airway tube, a stirrer and a thermometer, Vacuum dehydrate at 80°C for 2 hours, cool down to below 70°C, add 9.19g of 4,4'-dicyclohexylmethane diisocyanate, about 0.06g of organic bismuth catalyst, keep warm at 60-65°C until the NCO% is less than or equal to the theoretical value, To obtain a viscous liquid, cool it to 45°C, add 0.76g of triethylamine, stir for 10-15 minutes, after the material is uniform in one phase, set the stirring speed to 1500-3000 rpm, add 1.70g of ethylenediaminoethanesulfonate A mixed solution of sodium bicarbonate (50% aqueous solution) and 31g of water was reacted at 50°C for 1.5 hours to obtain a white emulsion, and a mixed solution of 0.35g of ethylenediamine and 19.00g of water was ...

Embodiment 3

[0067] Add 30.00 g of polytetrahydrofuran diol with a number average molecular weight of 2000, 10.05 g of polytetrahydrofuran diol with a number average molecular weight of 1000, and 1.23 g of dimethylol butyric acid into a three-necked flask equipped with an air guide tube, a stirrer and a thermometer, and vacuum dehydrate , cooled to below 70°C, add 13.01g of 4,4'-dicyclohexylmethane diisocyanate, about 0.06g of organic bismuth catalyst, 60-65°C heat preservation reaction 3 until NCO% is less than or equal to the theoretical value, 60-65°C heat preservation reaction When the NCO% is less than or equal to the theoretical value, a viscous liquid is obtained. Cool to 50°C, add 0.79g triethylamine, and stir for 10-15 minutes. After the material is uniform, set the stirring speed to 1500-3000 rpm, add A mixed solution of 2.01g of sodium ethylenediamine ethanesulfonate (50% aqueous solution) and 40g of water was reacted at 50°C for 1.5 hours to obtain a white emulsion, and a mixed ...

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Abstract

The invention relates to a method for preparing water-based polyurethane dispersion without an organic solvent, and belongs to the field of water-based polyurethane material synthesis. The organic solvent-free preparation method first uses low-reactivity alicyclic polyisocyanate, polypolyol and small molecule chain extender with potential hydrophilic groups to perform prepolymerization at a relatively low temperature to obtain a linear structure-based, in- The low-viscosity polyurethane prepolymer that is easy to disperse in water, and then under the stirring of 1000-3000 rpm, through the introduction of new hydrophilic groups in the prepolymer, two or more steps of dispersion are carried out at the same time. Dispersion liquid with high particle size distribution, re-dispersed to reduce the particle size distribution of the dispersion liquid, so as to obtain a stable water-based polyurethane dispersion. The aqueous polyurethane dispersion with a solid content of up to 52% and a storage stability period of up to 1 year is prepared by the organic solvent-free preparation method.

Description

technical field [0001] The invention relates to a method for preparing water-based polyurethane dispersion without an organic solvent, and belongs to the field of water-based polyurethane material synthesis. Background technique [0002] Waterborne polyurethane dispersions are widely used in the fields of adhesives, coatings, and inks. The methods used in industrial production and laboratory preparation are generally prepolymer method and acetone method. The prepolymer method is to prepare a prepolymer in a small amount of solvent (N-methylpyrrolidone, a commonly used high-boiling point solvent), disperse it in an aqueous solution while it is hot, and then extend the chain with diamine or hydrazine to obtain the product . The acetone method is to firstly prepare a prepolymer from polyol, polyisocyanate, low molecular weight diol, etc., add a large amount of acetone to dissolve after cooling down, then extend the chain with a chain extender, add water to disperse, and evapo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/44C08G18/48C08G18/32C08G18/12
CPCC08G18/755C08G18/44C08G18/348C08G18/6659C08G18/12C08G18/4854C08G18/4804C08G18/4808C08G18/6692C08G18/4238C08G18/4018C08G18/758C08G18/3857C08G18/3228
Inventor 龚翠然许莹罗震郑杨清余利明赵辉
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI