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Preparation method for synthesizing antibacterial waterborne polyurethane by oxidative depolymerization of chitosan

A technology of water-based polyurethane and oligomeric chitosan, which is applied in the field of polymer materials, can solve the problems that chitosan is insoluble in water and difficult to synthesize water-based polyurethane, and achieves excellent thermal stability, improved antibacterial properties, and improved mechanical properties. performance effect

Inactive Publication Date: 2021-07-30
KUNSHAN JIALIPU PLATE MAKING TACKIFIER & INK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method for synthesizing antibacterial waterborne polyurethane by oxidative depolymerization of chitosan, and its purpose is to solve the technical problem that existing chitosan is difficult to dissolve in water and is difficult to be used for synthesizing waterborne polyurethane

Method used

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  • Preparation method for synthesizing antibacterial waterborne polyurethane by oxidative depolymerization of chitosan
  • Preparation method for synthesizing antibacterial waterborne polyurethane by oxidative depolymerization of chitosan
  • Preparation method for synthesizing antibacterial waterborne polyurethane by oxidative depolymerization of chitosan

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Embodiment 1

[0042] A kind of preparation method of oxidative depolymerization chitosan synthetic antibacterial type waterborne polyurethane, described preparation method comprises the following steps:

[0043] Step 1. prepare oligomeric chitosan suspension and polyurethane salt-forming solution;

[0044]Chitosan is oxidatively depolymerized with 20% hydrogen peroxide solution, hydrogen peroxide reacts with chitosan free radicals, and the 1,4-β-D glucosidic bond of chitosan is fully reacted was cut off, then washed with acetone, centrifuged, and freeze-dried to obtain oligomeric chitosan; weigh 0.20 g of the described chitosan oligosaccharide, evenly disperse it in 48.23 g of deionized water, and then ultrasonically treat it for 30 minutes to obtain oligomeric chitosan Chitosan suspension; that is, reducing the molecular weight of the chitosan by oxidative depolymerization treatment, thereby increasing the hydrophilicity, and obtaining oligomeric chitosan with higher solubility in water. ...

Embodiment 2

[0051] A kind of preparation method of oxidative depolymerization chitosan synthetic antibacterial type waterborne polyurethane, described preparation method comprises the following steps:

[0052] Step 1. prepare oligomeric chitosan suspension and polyurethane salt-forming solution;

[0053] Chitosan is oxidatively depolymerized by using a hydrogen peroxide solution with a concentration of 15%. Hydrogen peroxide reacts with chitosan by free radicals. cut off, then washed with acetone, centrifuged, and freeze-dried to obtain oligomeric chitosan; weigh 0.24g of the described chitosan oligomeric, evenly disperse in 48.23g of deionized water, and then ultrasonically treat for 30 minutes to obtain oligomeric chitosan Chitosan suspension; that is, reducing the molecular weight of the chitosan by oxidative depolymerization treatment, thereby increasing the hydrophilicity, and obtaining oligomeric chitosan with higher solubility in water.

[0054] After drying 6.42g of polytetrameth...

Embodiment 3

[0060] A kind of preparation method of oxidative depolymerization chitosan synthetic antibacterial type waterborne polyurethane, described preparation method comprises the following steps:

[0061] Step 1. prepare oligomeric chitosan suspension and polyurethane salt-forming solution;

[0062] Chitosan is oxidatively depolymerized by using a hydrogen peroxide solution with a concentration of 15%. Hydrogen peroxide reacts with chitosan by free radicals. cut off, then washed with acetone, centrifuged, and freeze-dried to obtain oligomeric chitosan; weigh 0.28g of the described chitosan oligomeric, evenly disperse in 48.23g of deionized water, and then ultrasonically treat for 30 minutes to obtain oligomeric chitosan Chitosan suspension; that is, reducing the molecular weight of the chitosan by oxidative depolymerization treatment, thereby increasing the hydrophilicity, and obtaining oligomeric chitosan with higher solubility in water.

[0063] After drying 6.42g of polytetrameth...

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Abstract

The invention relates to a preparation method for synthesizing antibacterial waterborne polyurethane by oxidative depolymerization of chitosan, which comprises the steps of 1, carrying out oxidative depolymerization treatment on chitosan by adopting a hydrogen peroxide solution, cutting off 1, 4-beta-D glucoside bonds, carrying out post-treatment to obtain chitosan oligosaccharide, uniformly dispersing the chitosan oligosaccharide in water to obtain a chitosan oligosaccharide suspension, reacting polyether polyol or polyester polyol, isophorone diisocyanate, 2, 2-dimethylolpropionic acid, N, N-dimethyl pyrrolidone and acetone in batches to obtain a polyurethane prepolymer, adding triethylamine for a neutralization reaction, and obtaining a polyurethane salt-forming solution; 2, adding ethidene diamine to carry out chain extension reaction, and adding the chitosan oligosaccharide suspension to carry out emulsification reaction in an ice-water bath to obtain a modified waterborne polyurethane mixed emulsion; and 3, removing acetone, and obtaining the antibacterial waterborne polyurethane emulsion, wherein the antibacterial property is remarkably improved. The technical problem that existing chitosan is difficult to dissolve in water and is difficult to be used for synthesizing waterborne polyurethane is solved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method for synthesizing antibacterial water-based polyurethane by oxidatively depolymerizing chitosan. Background technique [0002] Water-based polyurethane is a new polyurethane system that uses water instead of organic solvents as the dispersion medium. Because its continuous phase is water, it is safe and easy to store and store, and it is easy to use and low in cost. It retains the characteristics of solvent-based polyurethane relatively completely. In addition, because water-based polyurethane There are Coulomb forces and hydrogen bonds in the molecular chain, which make it superior to solvent-based polyurethane in some properties. Therefore, water-based polyurethane has the advantages of low toxicity, non-combustibility, low pollution, energy saving, safety, etc., and its development and production are valued by countries all over the world. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08L5/08C08G18/75C08G18/66C08G18/48C08G18/34C08G18/32C08G18/10C08B37/08
CPCC08L75/08C08G18/755C08G18/4825C08G18/10C08B37/003
Inventor 夏琪娄文雪唐敏艳蒋平平张萍波
Owner KUNSHAN JIALIPU PLATE MAKING TACKIFIER & INK
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