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Method for improving antibacterial property of polyurethane coating by utilizing hydrophilic chain extender

A hydrophilic chain extender and polyurethane coating technology, which is applied in polyurea/polyurethane coatings, antifouling/underwater coatings, biocide-containing paints, etc., can solve the problem of not being directly soluble in water and difficult to disperse in water and other problems, to achieve high strength, good toughness, and obvious antibacterial properties

Inactive Publication Date: 2020-03-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Generally, polyurethane is very hydrophobic, neither directly soluble in water, nor difficult to disperse in water.

Method used

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  • Method for improving antibacterial property of polyurethane coating by utilizing hydrophilic chain extender
  • Method for improving antibacterial property of polyurethane coating by utilizing hydrophilic chain extender
  • Method for improving antibacterial property of polyurethane coating by utilizing hydrophilic chain extender

Examples

Experimental program
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Effect test

example 1

[0033] In a four-necked flask equipped with a thermometer and a condenser tube, add 0.005mol of polytetrahydrofuran diol, dehydrate under vacuum at 90°C for half an hour, cool down to 70°C, add 0.026mol of isophorone diisocyanate, 0.1ml of dilauric acid Dibutyltin, reacted for 3 hours. Cool down to below 50°C, add 10g of acetone to dilute the prepolymer, add 0.015mol N-methyldiethanolamine, raise the temperature to 70°C and react for 5 hours. Lower the temperature to below 50°C and add 5 g of acetone, and add 0.015 mol of glacial acetic acid at room temperature to react for half an hour. Add 35 g of deionized water containing antimicrobial agent dropwise into a constant pressure dropping funnel, and emulsify at a high stirring rate. After stirring for 10 minutes, the acetone was removed by rotary evaporation to obtain a stable emulsion with a hydrophilic group content of 10% by weight of the polymer. The emulsion was coated on a polytetrafluoroethylene board, and dried at 60...

example 2

[0035] In a four-necked flask equipped with a thermometer and a condenser tube, add 0.005mol of polytetrahydrofuran diol, dehydrate under vacuum at 90°C for half an hour, cool down to 70°C, add 0.0195mol of isophorone diisocyanate, 0.1ml of dilauric acid Dibutyltin, reacted for 3 hours. Cool down to below 50°C, add 10g of acetone to dilute the prepolymer, add 0.01mol N-methyldiethanolamine, raise the temperature to 70°C and react for 5 hours. Lower the temperature to below 50°C and add 5 g of acetone, and add 0.01 mol of glacial acetic acid at room temperature to react for half an hour. Add 35 g of the aqueous solution containing the antibacterial agent dropwise into the constant-pressure dropping funnel, and emulsify at a high stirring speed. After stirring for 10 minutes, the acetone was removed by rotary evaporation to obtain a stable emulsion with a hydrophilic group content of 7.5% by weight of the polymer. The emulsion was coated on a polytetrafluoroethylene board, and...

example 3

[0037] In a four-necked flask equipped with a thermometer and a condenser tube, add 0.005mol of polytetrahydrofuran diol, dehydrate under vacuum at 90°C for half an hour, cool down to 70°C, add 0.013mol of isophorone diisocyanate, 0.1ml of dilauric acid Dibutyltin, reacted for 3 hours. Cool down to below 50°C, add 10g of acetone to dilute the prepolymer, add 0.005mol N-methyldiethanolamine, raise the temperature to 70°C and react for 5 hours. Lower the temperature to below 50°C and add 5 g of acetone, and add 0.005 mol of glacial acetic acid at room temperature to react for half an hour. Add 35 g of the aqueous solution containing the antibacterial agent dropwise into the constant-pressure dropping funnel, and emulsify at a high stirring rate. After stirring for 10 minutes, the acetone was removed by rotary evaporation to obtain a stable emulsion with a hydrophilic group content of 4.5% by mass fraction of the polymer. The emulsion was coated on a polytetrafluoroethylene boa...

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Abstract

The invention discloses a method for improving the antibacterial property of a polyurethane coating by utilizing a hydrophilic chain extender. The preparation method comprises the following steps: with polytetrahydrofuran glycol as a soft segment, isophorone diisocyanate as a hard segment, dibutyltin dilaurate as a catalyst and N-methyldiethanolamine as a hydrophilic chain extender, adjusting thecontent of the hydrophilic chain extender, carrying out neutralizing with glacial acetic acid, and performing emulsifying with an aqueous solution containing an antibacterial agent so as to obtain polyurethane antibacterial coatings with different hydrophilicities. The method of the invention overcomes defects in the prior art and can control the antibacterial property of the cationic waterborne polyurethane coating without increasing the content of an antibacterial agent; and the method can improve the antibacterial capacity of the coating and reduce the use amount of the antibacterial agent.

Description

technical field [0001] The invention belongs to the technical field of antibacterial agent release, and more specifically, relates to a method for improving the antibacterial performance of polyurethane coatings by using a hydrophilic chain extender, changing the hydrophilic property of polyurethane mixed with the antibacterial agent, thereby changing the release ability of the antibacterial agent, and obtaining Polyurethane antibacterial coatings with different antibacterial effects. Background technique [0002] Generally, polyurethane is highly hydrophobic, neither directly soluble in water, nor difficult to disperse in water. Introduce hydrophilic ionic groups into the molecular structure of hydrophobic polyurethane, and then disperse them in water to obtain water-based polyurethane emulsion. Cationic water-based polyurethane is a water-based polyurethane polymerized by polyisocyanate, polyol and small molecule chain extender N-methyldiethanolamine, neutralized by glaci...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/14C08G18/75C08G18/66C08G18/48C08G18/10C08G18/32
CPCC08G18/10C08G18/4854C08G18/755C09D5/14C09D175/04C08G18/3275C08K5/0058
Inventor 蒋世春白若刘晓非李景庆
Owner TIANJIN UNIV
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