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 improved molecular weight, water resistance and ethanol resistance. , the effect of mitigating the greenhouse effect

Active Publication Date: 2019-05-07
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 polypropylene carbonate diol with a molecular weight of 3000 and a hydroxyl functionality of 2, 5 parts of castor oil, add 25 parts of isophorone diisocyanate and 4.7 parts of dimethylolpropionic 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. 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 were added. 30min second reaction, cooling to 40℃, adding 3.54 parts of triethylamine for 5min neutralization reaction, adding 200 parts of deionized water 2000rpm for 15min, then adding 1.2 parts of ethylenediamine for 30min third reaction (chain extension reaction), The temperature is raised to 50° C. to remove acetone under reduced pressure to obtain an aqueous polyurethane emulsion.

Embodiment 2

[0045] In parts by mass, take 50 parts of polypropylene carbonate diol with a molecular weight of 3000 and a hydroxyl functionality of 2, 10 parts of castor oil, add 25 parts of isophorone diisocyanate and 4.7 parts of dimethylolpropionic 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. 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 were added. 30min second reaction, cooling to 40℃, adding 3.54 parts of triethylamine for 5min neutralization reaction, adding 200 parts of deionized water 2000rpm for 15min, then adding 1.2 parts of ethylenediamine for 30min third reaction (chain extension reaction), The temperature is raised to 50° C. to remove acetone under reduced pressure to obtain an aqueous polyurethane emulsion.

Embodiment 3

[0047] In parts by mass, take 45 parts of polypropylene carbonate diol with a molecular weight of 3000 and a hydroxyl functionality of 2, 15 parts of castor oil, add 25 parts of isophorone diisocyanate and 4.7 parts of dimethylolpropionic 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. 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 were added. 30min second reaction, cooling to 40℃, adding 3.54 parts of triethylamine for 5min neutralization reaction, adding 200 parts of deionized water 2000rpm for 15min, then adding 1.2 parts of ethylenediamine for 30min third reaction (chain extension reaction), The temperature is raised to 50° C. to remove acetone under reduced pressure to obtain an aqueous polyurethane emulsion.

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Abstract

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a water-based polyurethane emulsion with high water resistance and ethanol resistance and a preparation method thereof. The invention provides the preparation method of the water-based polyurethane emulsion with high water resistance and ethanol resistance. The preparation method comprises the following steps: a) carrying out a first reaction on poly(propylene carbonate) polyol, diisocyanate, castor oil and a hydrophilic chain extender under the action of a catalyst to obtain a first product;b) adding a silane coupling agent into the first product to carry out a second reaction to obtain a second product; and c) adding a neutralizer into the second product to carry out a neutralization reaction, then adding deionized water for emulsifying, and then adding a non-hydrophilic chain extender to carry out a third reaction to obtain the water-based polyurethane emulsion. Experimental results show that a coating film formed by the water-based polyurethane emulsion disclosed by the invention has excellent boiling water resistance and ethanol resistance.

Description

Technical field [0001] The invention belongs to the technical field of fine chemicals, and particularly relates to an aqueous 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 finishing agents. Waterborne polyurethane needs to contain a certain amount of hydrophilic groups to have better stability, and the presence of hydrophilic groups makes the polyurethane easy to absorb water and reduces its mechanical properties. Therefore, the existing water-based polyurethane has a large gap in water resistance and ethanol resistance compared with oil-based polyurethane, which limits the application field of water-based polyurethane. Summary of the invention [0003] In view of this, the present invention provides a water-based polyurethane emulsion with high water resistance and ethanol resista...

Claims

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Application Information

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Patent Type & Authority Applications(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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