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Polyurethane aqueous resin containing Schiff base structure, and preparation method thereof

A water-based resin and Schiff base technology, applied in polyurea/polyurethane coatings, biocide-containing paints, antifouling/underwater coatings, etc., can solve problems such as harmful to human health, endangering human health, and paint drop. To achieve the effect of long-lasting antibacterial performance, excellent performance and good adhesion

Inactive Publication Date: 2019-04-02
SHAOGUAN HEZHONG CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of society and the improvement of people's living standards, people attach great importance to their own health, quality of life and living environment. With the rapid development of industry, the living environment of human beings has further deteriorated, and harmful microorganisms such as bacteria and molds seriously endanger human health; In the process of decoration, people usually choose paints with antibacterial effects. During the use of existing paints, especially wall paints, mildew spots often appear on the wall after use. It takes a little longer and it is easy to appear. Large pieces of paint fall off, and usually contain a certain amount of formaldehyde or volatile organic substances harmful to human health, which seriously endanger human health

Method used

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  • Polyurethane aqueous resin containing Schiff base structure, and preparation method thereof
  • Polyurethane aqueous resin containing Schiff base structure, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A kind of salicylaldehyde Schiff base, its preparation process is as follows:

[0032] Add 25.0 parts of salicylaldehyde and 11.0 parts of ethanol to a three-necked reaction kettle equipped with a thermometer, agitator, and condenser tube, raise the temperature to 80°C and stir evenly, and weigh N,N-dimethyl-1,3-propane Dissolve 20.9 parts of diamine in 22.0 parts of ethanol, slowly add it dropwise into the above reaction kettle, and add an appropriate amount of 0.8 parts of glacial acetic acid, stir and reflux for 4-5 hours, wait until the reaction is complete, then cool to room temperature, and let it stand overnight. The crude product was obtained by suction filtration; the obtained crude product was recrystallized with 20.3 parts of ethanol, and dried in vacuum to obtain the salicylaldehyde Schiff base.

Embodiment 2

[0034] A kind of salicylaldehyde Schiff base, its preparation process is as follows:

[0035] Add 22.0 parts of salicylaldehyde and 10.0 parts of ethanol to a three-necked reaction kettle equipped with a thermometer, agitator, and condenser tube, raise the temperature to 80°C and stir evenly, and weigh N,N-dimethyl-1,3-propane Dissolve 18.4 parts of diamine in 20.0 parts of ethanol, then slowly drop it into the above reaction kettle, and add an appropriate amount of 0.6 parts of glacial acetic acid, stir and reflux for 4 to 5 hours, and cool to room temperature after the reaction is complete, and let it stand overnight. The crude product was obtained by suction filtration; the obtained crude product was recrystallized with 29.0 parts of ethanol, and dried in vacuum to obtain the salicylaldehyde Schiff base.

Embodiment 3

[0037] A kind of salicylaldehyde Schiff base, its preparation process is as follows:

[0038]Add 26.0 parts of salicylaldehyde and 11.5 parts of ethanol to a three-necked reaction kettle equipped with a thermometer, agitator, and a condenser, raise the temperature to 80°C and stir evenly, and weigh N,N-dimethyl-1,3-propane Dissolve 21.8 parts of diamine in 24.0 parts of ethanol, then slowly drop it into the above reaction kettle, and add an appropriate amount of 0.7 parts of glacial acetic acid, stir and reflux for 4-5 hours, wait until the reaction is complete, then cool to room temperature, and let it stand overnight. The crude product was obtained by suction filtration; the obtained crude product was recrystallized with 16.0 parts of ethanol, and dried in vacuum to obtain the salicylaldehyde Schiff base.

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PUM

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Abstract

The invention relates to a polyurethane aqueous resin containing a Schiff base structure, and a preparation method thereof, wherein the components comprise, by weight, 8.0-15.0 parts of polyisocyanate, 2.0-4.0 parts of polyol, 2.5-5.0 parts of salicylaldehyde-based Schiff base, 6.0-12.0 parts of oligomer polyol, 1.5-3.0 parts of 2,2-bis(hydroxymethyl)propionic acid, 7.0-15.0 parts of acetone, 0.01-0.1 part of dibutyltin dilaurate, 1.0-2.5 parts of a neutralizing agent, and 50.0-68.0 parts of deionized water, wherein the salicylaldehyde-based Schiff base is prepared by carrying out a reaction on salicylaldehyde and N,N-dimethyl-1,3-propanediamine. According to the present invention, the prepared polyurethane aqueous resin has advantages of good adhesion, good hardness, water resistance, alkali resistance, corrosion resistance, durability and the like, can be used as an antibacterial coating material without the adding of antibacterial agents, can achieve lasting and effective antibacterial effect, can be used for interior and exterior wall coating materials, woodware coating materials, metal coating materials and the like, and has great application potential.

Description

technical field [0001] The invention relates to a preparation method of a modified water-based polyurethane resin, in particular to a water-based polyurethane resin containing a Schiff base structure, which belongs to the technical field of synthetic resins. Background technique [0002] With the development of society and the improvement of people's living standards, people attach great importance to their own health, quality of life and living environment. With the rapid development of industry, the living environment of human beings has further deteriorated, and harmful microorganisms such as bacteria and molds seriously endanger human health; In the process of decoration, people usually choose paints with antibacterial effects. During the use of existing paints, especially wall paints, mildew spots often appear on the wall after use. It takes a little longer and it is easy to appear. Large pieces of paint fall off, and usually contain a certain amount of formaldehyde or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D5/14C09D5/08C08G18/28C08G18/32C08G18/34C08G18/48C08G18/73C08G18/75C08G18/66
CPCC08G18/0823C08G18/2875C08G18/3206C08G18/348C08G18/4854C08G18/6692C08G18/73C08G18/755C09D5/08C09D5/14C09D175/08
Inventor 张武许钧强康伦国姚东生阳京辉
Owner SHAOGUAN HEZHONG CHEM CO LTD
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