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Preparation method of self-antibacterial castor oil based aqueous polyurethane emulsion

A water-based polyurethane and castor oil-based technology, applied in polyurea/polyurethane coatings, biocide-containing paints, antifouling/underwater coatings, etc., can solve the problems of less application research and low toxicity, and achieve simplification Synthesis process, long-lasting antibacterial performance, and effect of maintaining antibacterial performance

Active Publication Date: 2020-02-07
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Sorbic acid is considered to be an antibacterial agent with high safety and low toxicity. It has a good inhibitory effect on common bacteria and microorganisms in daily life. It is often used in the field of food preservation, and its application in the field of water-based polyurethane is less researched.

Method used

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  • Preparation method of self-antibacterial castor oil based aqueous polyurethane emulsion
  • Preparation method of self-antibacterial castor oil based aqueous polyurethane emulsion
  • Preparation method of self-antibacterial castor oil based aqueous polyurethane emulsion

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Experimental program
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Embodiment 1

[0031] Embodiment 1: Preparation of self-antibacterial castor oil-based aqueous polyurethane emulsion

[0032] 1. Add 18.66g of castor oil and 19.98g of IPD I (isophorone diisocyanate) into a three-necked flask, heat up to 45°C and add 2 drops of stannous octoate catalyst, and the system is in a nitrogen atmosphere Reaction at 75°C for 3h;

[0033] 2. Lower the temperature of the reaction system in step 1 to below 40°C, slowly add 1.35g of 1,4-butanediol, and then add 3mL of butanone to adjust the viscosity, and react the system at 65°C for 2 hours under a nitrogen atmosphere;

[0034] 3. Cool down the reaction system in step 2 to below 40°C, slowly add 3.57g (one drop of 2s) of N-methyldiethanolamine with a constant pressure funnel, then add 2mL of butanone to adjust the viscosity, and react the system at 60°C for 2h under nitrogen atmosphere;

[0035] 4. Cool down the reaction system in step 3 to below 35°C, add 0.17g sorbic acid and 1.5g acetic acid mixed solution dissolve...

Embodiment 2

[0039] Embodiment 2: Preparation of self-antibacterial castor oil-based aqueous polyurethane emulsion

[0040] 1. Add 18.66g of castor oil and 19.98g of I PDI (isophorone diisocyanate) into a three-necked flask, heat up to 45°C and add 2 drops of stannous octoate catalyst, and the system is under nitrogen atmosphere Reaction at 75°C for 3h;

[0041] 2. Cool down the reaction system in step 1 to below 40°C, slowly add 0.9g of 1,4-butanediol, then add 3mL of butanone to adjust the viscosity, and react the system at 65°C for 2h under nitrogen atmosphere;

[0042] 3. Cool down the reaction system in step 2 to below 35°C, slowly add 4.16g (one drop of 2s) N-methyldiethanolamine with a constant pressure funnel, then add 2mL butanone to adjust the viscosity, and react the system at 60°C for 2h under nitrogen atmosphere;

[0043] 4. Cool down the reaction system in step 3 to below 35°C, add a mixed solution of 0.26g sorbic acid and 1.9g acetic acid dissolved in butanone, after formin...

Embodiment 3

[0047] Embodiment 3: Preparation of self-antibacterial castor oil-based aqueous polyurethane emulsion

[0048] 1. Add 18.66g of castor oil and 19.98g of I PDI (isophorone diisocyanate) into a three-necked flask, heat up to 45°C and add 2 drops of stannous octoate catalyst, and the system is under nitrogen atmosphere Reaction at 75°C for 3h;

[0049] 2. Cool down the reaction system in step 1 to below 40°C, slowly add 1.8g of 1,4-butanediol, then add 3mL of butanone to adjust the viscosity, and react the system at 65°C for 2h under nitrogen atmosphere;

[0050] 3. Lower the temperature of the reaction system in step 2 to below 40°C, slowly add 3.1g (one drop of 2s) N-methyldiethanolamine with a constant pressure funnel, then add 2mL butanone to adjust the viscosity, and react the system at 60°C for 2h under a nitrogen atmosphere;

[0051] 4. Cool down the reaction system in step 3 to below 35°C, add a mixed solution of 0.35g sorbic acid and 1.3g acetic acid dissolved in methyl...

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Abstract

The invention discloses a preparation method of a self-antibacterial castor oil based aqueous polyurethane emulsion. Firstly, natural renewable resource castor oil replaces conventional polyhydric alcohol to be used as a raw material and reacts with diisocyanate to obtain a prepolymer, then the prepolymer is subjected to chain extension by a cationic monomer, and finally, an antibacterial monomerpart replaces acetic acid to neutralize, salify and self-emulsify so as to obtain the self-antibacterial castor oil based aqueous polyurethane emulsion. According to a synthetic polyurethane material,an antimicrobial agent does not need to be externally added, a polyurethane matrix unit also does not need to be changed, and green low-toxicity sorbic acid is simultaneously selected as the antimicrobial agent and a salt-forming agent, so that a synthesis process is greatly simplified; and an active antibacterial group is introduced into the polyurethane material in an ionic bond mode, so that the polyurethane material has excellent washability, antibacterial performance of the polyurethane material can be kept for long time, and the polyurethane material is expected to be applied to the fields of an antibacterial coating and the like.

Description

technical field [0001] The invention relates to the field of synthesis of water-based polyurethane emulsion, in particular to a preparation method of self-antibacterial castor oil-based water-based polyurethane emulsion. Background technique [0002] Waterborne polyurethane (WPU) material has become one of the most researched polymer materials in the past decade due to its good heat resistance, flexibility, and high strength. It is often used in medical equipment, industrial coatings and other fields. However, it is susceptible to interference from bacteria and microorganisms during use, resulting in poor performance and affecting its application in more fields. Therefore, there are more and more inventions about antibacterial water-based polyurethane. [0003] At present, the methods to have antibacterial properties for waterborne polyurethane materials mainly include physical and chemical methods. The physical method is a method commonly used by early researchers. The st...

Claims

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Application Information

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IPC IPC(8): C08G18/36C08G18/32C08G18/10C08J5/18C09D175/14C09D5/14C08L75/14
CPCC08G18/10C08G18/3206C08G18/3275C08G18/36C08J5/18C08J2375/14C09D5/14C09D175/14
Inventor 杨建军周登健吴庆云张建安吴明元刘久逸
Owner ANHUI UNIVERSITY
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