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A kind of water-based polyurethane emulsion with high water resistance and ethanol resistance and preparation method thereof

A water-based polyurethane and water-resistant technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of limited application fields and large gaps in ethanol resistance performance, and achieve the effect of improving water resistance and ethanol resistance performance

Active Publication Date: 2021-08-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a water-based polyurethane emulsion with high water resistance and ethanol resistance and a preparation method thereof, which is used to solve the problem that the ethanol-resistant performance of the existing water-based polyurethane emulsion is relatively different from that of oily polyurethane, and the application field is limited. limit problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In parts by mass, take 55 parts of molecular weight as 3000, polypropylene carbonate diol with hydroxyl functionality of 2, 5 parts of castor oil, add 25 parts of isophorone diisocyanate and 4.7 parts of dimethylol propionic acid Under the action of 0.12 parts of stannous octoate, the first reaction was carried out at 85°C for 4 hours to obtain the first product, and 20 parts of acetone was added to the first product to reduce the viscosity, the temperature was lowered to 50°C, and 2.7 parts of KH-550 was added to carry out 30min for the second reaction, lower the temperature to 40°C, add 3.54 parts of triethylamine for 5min neutralization reaction, add 200 parts of deionized water at 2000rpm for emulsification for 15min, then add 1.2 parts of ethylenediamine for 30min for the third reaction (chain extension reaction), Raise the temperature to 50°C to remove acetone under reduced pressure to obtain a water-based polyurethane emulsion.

Embodiment 2

[0045] In terms of parts by mass, 50 parts of molecular weight is 3000, polypropylene carbonate diol with hydroxyl functionality of 2, 10 parts of castor oil, 25 parts of isophorone diisocyanate and 4.7 parts of dimethylol propionic acid are added Under the action of 0.12 parts of stannous octoate, the first reaction was carried out at 85°C for 4 hours to obtain the first product, and 20 parts of acetone was added to the first product to reduce the viscosity, the temperature was lowered to 50°C, and 2.7 parts of KH-550 was added to carry out 30min for the second reaction, lower the temperature to 40°C, add 3.54 parts of triethylamine for 5min neutralization reaction, add 200 parts of deionized water at 2000rpm for emulsification for 15min, then add 1.2 parts of ethylenediamine for 30min for the third reaction (chain extension reaction), Raise the temperature to 50°C to remove acetone under reduced pressure to obtain a water-based polyurethane emulsion.

Embodiment 3

[0047] In parts by mass, 45 parts of molecular weight is 3000, polypropylene carbonate diol with hydroxyl functionality of 2, 15 parts of castor oil, 25 parts of isophorone diisocyanate and 4.7 parts of dimethylol propionic acid are added Under the action of 0.12 parts of stannous octoate, the first reaction was carried out at 85°C for 4 hours to obtain the first product, and 20 parts of acetone was added to the first product to reduce the viscosity, the temperature was lowered to 50°C, and 2.7 parts of KH-550 was added to carry out 30min for the second reaction, lower the temperature to 40°C, add 3.54 parts of triethylamine for 5min neutralization reaction, add 200 parts of deionized water at 2000rpm for emulsification for 15min, then add 1.2 parts of ethylenediamine for 30min for the third reaction (chain extension reaction), Raise the temperature to 50°C to remove acetone under reduced pressure to obtain a water-based polyurethane emulsion.

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Abstract

The invention belongs to the technical field of fine chemicals, and in particular relates to a water-based polyurethane emulsion with high water resistance and ethanol resistance and a preparation method thereof. The invention provides a kind of preparation method that has high water resistance, the waterborne polyurethane emulsion of ethanol resistance, comprises the following steps: a) polypropylene carbonate polyol, diisocyanate, castor oil and hydrophilic chain extender are in catalyst Under the action of the first reaction, the first product is obtained; b) a silane coupling agent is added to the first product, and the second reaction is carried out to obtain the second product; c) the middle product is added to the second product After the neutralization reaction with the neutralizing agent, deionized water is added for emulsification, and then a non-hydrophilic chain extender is added for the third reaction to obtain a water-based polyurethane emulsion. Experimental results show that the coating film formed by the water-based polyurethane emulsion of the present invention has excellent boiling water resistance and ethanol resistance.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a water-based polyurethane emulsion with high water resistance and ethanol resistance and a preparation method thereof. Background technique [0002] Waterborne polyurethane is an environmentally friendly material widely used in coatings, adhesives and leather finishes. Water-based polyurethane needs to contain a certain amount of hydrophilic groups to have better stability, and the presence of hydrophilic groups makes polyurethane easy to absorb water, resulting in a decrease in its mechanical properties. Therefore, the water resistance and ethanol resistance of existing water-based polyurethanes are quite different from those of oil-based polyurethanes, which limits the application fields of water-based polyurethanes. Contents of the invention [0003] In view of this, the present invention provides a water-based polyurethane emulsion with high water resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/67C08G18/66C08G18/44C08G18/34C08G18/32C08G18/12C08G18/28C09D175/14
Inventor 李昭陈熙符宗可朱炜健程梦平萧雅刘保华
Owner GUANGDONG UNIV OF TECH
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