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Cationic waterborne polyurethane-chitosan blend and preparation method therefor

A water-based polyurethane and chitosan technology, applied in polyurea/polyurethane coatings, chitin polysaccharide coatings, coatings, etc., can solve the problems of increased cost, unstable blend structure, poor water resistance, etc., and achieve uniform blending. Effect

Active Publication Date: 2017-09-05
中知在线股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of a large amount of traditional organic solvents can also cause environmental impact or increase costs
It is a good idea to blend water-based polyurethane and chitosan in the water system, but the current existing technology shows that chitosan is mainly dissolved in acidic aqueous solutions such as acetic acid, and ordinary water-based polyurethane is not stable under acidic conditions. Therefore, only when the chitosan is degraded to a very small molecular chain can it be well blended with these water-based polyurethanes, and the good water solubility of the short-chain chitosan after chitosan degradation also makes the prepared copolymer The water resistance of the mixture is relatively poor, and it is easy to be eluted under conditions such as washing with water, which is finally reflected in the instability of the blend structure

Method used

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  • Cationic waterborne polyurethane-chitosan blend and preparation method therefor
  • Cationic waterborne polyurethane-chitosan blend and preparation method therefor
  • Cationic waterborne polyurethane-chitosan blend and preparation method therefor

Examples

Experimental program
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Effect test

example 1

[0030]Add 0.005mol polytetrahydrofuran polyether glycol (PTMG2000) to a four-necked flask equipped with an electric stirrer, a thermometer and a reflux condenser, vacuum dehydrate and feed nitrogen, add 0.019mol isophorone diisocyanate (IPDI), and Hydrophilic chain extender 0.0096mol N-methyldiethanolamine (MDEA), then slowly warm up to 75°C, and react in an oil bath for 3h. Cool down to about 50°C and add 15g of acetone to dilute, add 0.0096mol glacial acetic acid to neutralize when the temperature is down to about 35°C, and react for half an hour. Under high-speed stirring, 37 g of deionized water was added dropwise with a constant pressure dropping funnel for emulsification, and finally acetone was removed by rotary evaporation to obtain a stable emulsion with a solid content of about 30%. The main chain of waterborne polyurethane is generally polymerized by oligomer polyols, diisocyanates and small molecule chain extenders. Oligomer polyol constitutes the soft segment of ...

example 2

[0032] Add 0.005mol polytetrahydrofuran polyether glycol (PTMG2000) to a four-necked flask equipped with an electric stirrer, a thermometer and a reflux condenser, vacuum dehydrate and feed nitrogen, add 0.019mol isophorone diisocyanate (IPDI), and Hydrophilic chain extender 0.0096mol N-methyldiethanolamine (MDEA), then slowly warm up to 75°C, and react in an oil bath for 3h. Cool down to about 50°C and add 15g of acetone to dilute, add 0.0065mol glacial acetic acid to neutralize when the temperature is down to about 35°C, and react for half an hour. Chitosan (0.18g, molecular weight 50,000-100,000) was dissolved in dilute glacial acetic acid solution (37ml, mass fraction 0.5%, glacial acetic acid was 0.0031mol), and the above solution was dripped with constant pressure under high-speed stirring. The liquid funnel was added dropwise, and finally the acetone was removed by rotary evaporation to obtain a stable emulsion with a solid content of about 30%. Product has no crystall...

example 3

[0034] Add 0.005mol polytetrahydrofuran polyether glycol (PTMG2000) to a four-necked flask equipped with an electric stirrer, a thermometer and a reflux condenser, vacuum dehydrate and feed nitrogen, add 0.019mol isophorone diisocyanate (IPDI), and Hydrophilic chain extender 0.0096mol N-methyldiethanolamine (MDEA), then slowly warm up to 75°C, and react in an oil bath for 3h. Cool down to about 50°C, add 15g of acetone to dilute, and add 0.001mol of silane coupling agent KH550, and react for 1h. When the temperature is lowered to about 35°C, add 0.0065mol glacial acetic acid for neutralization, and react for half an hour. Chitosan (0.18g, molecular weight 50,000-100,000) was dissolved in dilute glacial acetic acid solution (37ml, mass fraction 0.5%, glacial acetic acid was 0.0031mol), and the above solution was dripped with constant pressure under high-speed stirring. The liquid funnel was added dropwise, and finally the acetone was removed by rotary evaporation to obtain a s...

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Abstract

The invention discloses a cationic waterborne polyurethane-chitosan blend and a preparation method therefor. The cationic waterborne polyurethane-chitosan blend can be obtained through mixing a cationic waterborne polyurethane aqueous system, which is obtained through taking polytetrahydrofuran polyether glycol as a soft segment, taking isophorone diisocyanate as a hard segment and taking N-methyldiethanolamine as a hydrophilic chain extender, with an acetic aqueous solution, which is prepared from chitosan with high relative molecular weight, in an aqueous system environment, and subsequently further adopting methods such as film forming and drying. According to the cationic waterborne polyurethane-chitosan blend and the preparation method therefor, the difficulty that polyurethanes and hydrophilic chitosan are difficult in solution blending by adopting a cosolvent due to the fact that the polyurethanes are generally lipophilic and hydrophobic materials is overcome, an aqueous blending environment is beneficial to environmental protection, the difficulty that the chitosan cannot be subjected to melt blending with the polyurethanes due to thermal stability is overcome, and then, uniform-blend materials of the chitosan and polyurethane materials are obtained.

Description

technical field [0001] The invention belongs to the technical field of blended polymers, and more specifically relates to a method for blending polyurethane and chitosan. Background technique [0002] Polyurethane is a new class of synthetic polymers developed in the 1940s. Its molecular backbone contains many repeating carbamate (-NH-COO-) segments. As a resin with excellent performance, polyurethane has been widely used. For example, when used in coatings, it can be endowed with characteristics such as hardness, flexibility, wear resistance, chemical resistance, strong adhesion, low film forming temperature, and room temperature curing. Chitosan contains -OH, -NH 2 Polar group, with good hygroscopicity and moisture retention. Chitosan and its derivatives have good biocompatibility, biodegradability and antibacterial properties. If polyurethane and chitosan can be blended to obtain a homogeneous blend, the advantages of the two can be integrated, which is conducive to fu...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L5/08C08G18/75C08G18/66C08G18/48C08G18/32C08J3/03C09D175/08C09D105/08
CPCC08G18/3275C08G18/4854C08G18/6688C08G18/755C08J3/03C08J2375/08C08J2405/08C08L75/08C08L2201/54C09D175/08C08L5/08
Inventor 李景庆吴会敏蒋世春
Owner 中知在线股份有限公司
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