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Preparation method of organic silicon modified cationic waterborne antibacterial polyurethane emulsion

A water-based polyurethane and silicone technology, used in coatings and other directions to achieve good antibacterial properties, improved water resistance, and improved bonding strength

Active Publication Date: 2014-05-21
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Quaternary ammonium salt not only has antibacterial properties, but also has a synergistic effect on other bactericidal components. It has the advantages of high efficiency, low toxicity, and good chemical stability, but It has the disadvantages of easy foaming and easy adsorption to cause loss. In the long-term single use, it is easy to produce drug resistance. Generally, it is used in combination
[0007]According to actual needs, in order to solve the poor yellowing resistance and poor antibacterial properties of water-based polyurethane coatings in the use of water-based wood lacquers, in order to improve its comprehensive performance (bonding strength, film hardness, water resistance, etc.), it is urgent to develop a cationic water-based polyurethane emulsion with high comprehensive performance, which has excellent anti-yellowing performance and mechanical properties after being used after toning

Method used

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  • Preparation method of organic silicon modified cationic waterborne antibacterial polyurethane emulsion

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Experimental program
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Effect test

Embodiment 1

[0033] Add a certain amount of polyethylene glycol 1000 and sandan oil into a three-necked flask according to the material ratio of 2:1, raise the temperature to 100°C, remove the water in the system by vacuuming, and cool down for later use.

[0034] Add 222g of IPDI into an empty three-neck flask, start stirring, raise the temperature to 70°C, add 370g of the dried mixture of polyethylene glycol 1000 and sandan oil, after 30min dropwise, continue the reaction, add 100ml of butane to the system Ketones were reacted at 70°C for 2.5 hours to generate prepolymers with -NCO terminal groups; the value of -NCO was measured to meet the requirements.

[0035] According to the mass ratio of unreacted NCO to N-methyldiethanolamine in the reaction system is 4:1, add N-methyldiethanolamine dropwise, and continue the chain extension reaction at 70°C for 2 hours to obtain cationic end-NCO polyurethane; detection The value of NCO; after reaching the requirement, add dropwise 30min glacial a...

Embodiment 2

[0037] Add 750g polyethylene glycol 2000 and 27g sandan oil into the three-necked bottle, raise the temperature to 100°C, remove the water in the system by vacuuming, cool down to 80°C, start stirring, add 222g IPDI to the three-necked bottle, and then slowly cool down to 70°C, during the reaction, according to the viscosity change, add 80-120ml butanone to the system, react for 2.5h, measure the value of -NCO until the requirement is met, stop the reaction.

[0038] According to the mass ratio of unreacted NCO and N-methyldiethanolamine in the reaction system is 4:1, N-methyldiethanolamine is added dropwise, and the chain extension reaction is continued at 70°C for 2 hours to obtain cationic end-NCO polyurethane; detection The value of NCO; according to the mass ratio of N-methyldiethanolamine and glacial acetic acid, glacial acetic acid was added dropwise for 30min at a ratio of 1:1, stirred rapidly at a stirring speed of 800r / min, and reacted for 1h to vacuumize butanone to ...

Embodiment 3

[0040] Add 375g of polyethylene glycol 1000 and 27g of sandan oil into the three-necked bottle, raise the temperature to 100°C, remove the water in the system by vacuuming, cool down to 80°C, start stirring, and add 168g of 1,6-hexamethylene diisocyanate into the three-necked bottle , and then slowly lower the temperature to 70°C. During the reaction, according to the viscosity change, add 60-100ml butanone to the system, react at 70°C for 2.5h, measure the value of -NCO until the requirement is met, stop the reaction,

[0041] According to the mass ratio of unreacted NCO and N-methyldiethanolamine in the reaction system of 4:1, add N-methyldiethanolamine dropwise, continue the chain extension reaction at 70°C, and react for 2 hours to obtain cationic terminal-NCO Polyurethane; detect the value of NCO, according to the ratio of N-methyldiethanolamine and glacial acetic acid mass ratio of 1:0.9, add dropwise glacial acetic acid for 30min, stirring speed 1000r / min, vacuumize buta...

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Abstract

The invention discloses a preparation method of an organic silicon modified cationic waterborne antibacterial polyurethane emulsion. The method comprises the following steps: (1) enabling diisocyanate to be reacted with dihydric alcohol and three Dan oil to react to generate a prepolymer with -NCO as an end group; (2) enabling the N-methyldiethanolamine and the prepolymer to be subjected to chain extension reaction and adding an acid solution for ionizing to obtain cationic polyurethane with -NCO as the end group; (3) adding hydroxyl acrylate, and meanwhile, adding a silane coupling agent to be reacted with the -NCO to obtain organic silicon acrylate modified polyurethane, wherein the -NCO does not take part in reaction; (4) adding acrylate in a certain proportion and carrying out initiation polymerization by using an oxygen reduction system to obtain the organic silicon modified waterborne polyurethane emulsion. The organic silicon modified cationic waterborne antibacterial polyurethane emulsion prepared by using the preparation method has the advantages of the polyurethane and polysiloxane; an antibacterial structure is introduced to the molecular structure of the organic silicon modified cationic waterborne antibacterial polyurethane emulsion, so that the organic silicon modified cationic waterborne antibacterial polyurethane emulsion has relatively high comprehensive service character and can be applied to waterborne wood paints, waterborne paints with high performance and other paints.

Description

technical field [0001] The invention relates to a method for preparing an organic silicon-modified cationic waterborne polyurethane antibacterial emulsion, which belongs to the technical field of chemical industry. Background technique [0002] Due to its excellent performance and environmental protection advantages, water-based polyurethane has been successfully applied in various coatings and coating industries. During the specific use of water-based polyurethane, some yellowing resistance, poor weather resistance, poor water resistance, and bond strength have appeared. In order to improve the comprehensive performance of water-based polyurethane in specific application fields, research on acrylate, epoxy resin, and silicone-modified water-based polyurethane has become a major research focus. [0003] Silicone-modified waterborne polyurethane can be divided into anionic waterborne polyurethane and cationic waterborne polyurethane according to the type of salt-forming age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08G18/83C08G18/75C08G18/73C08G18/66C08G18/48C08G18/32C08G18/12C09D151/08
Inventor 曾国屏孙复钱陈衍华杨一兵单人为张军
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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