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Preparation method of bacteriostatic cationic nanofibrillated cellulose

A cationic and cellulose technology, applied in the field of preparation of nanofibrillated cellulose, can solve the problems of biodegradability, reduced NFC hydrophilicity, poor biosafety or environmental friendliness, etc., and achieves good thermal stability. Effect

Active Publication Date: 2019-04-12
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inorganic antibacterial agents such as loaded Ag are prone to loss during use, resulting in a rapid decline in antibacterial efficiency, and their biological safety or environmental friendliness are not good. After the cumbersome silane hydrophobization modification, the hydrophilicity of NFC will be obvious. reduced, its biodegradability will inevitably be affected
In addition, most of the NFCs used in the above studies are prepared by direct mechanical separation, which consumes a lot of energy and has low yield, which greatly limits its industrial application.

Method used

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  • Preparation method of bacteriostatic cationic nanofibrillated cellulose
  • Preparation method of bacteriostatic cationic nanofibrillated cellulose
  • Preparation method of bacteriostatic cationic nanofibrillated cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The method for preparing antibacterial Q-NFC at room temperature is as follows:

[0025] Weigh 0.3g NaOH and dissolve in 6.6g bleached wet bamboo pulp with a solid content of 15wt%, stir until evenly mixed, add 1.4g 2,3-epoxypropyltrimethylammonium chloride (EPTAC), and mix well Afterwards, place it at room temperature and react for 1 hour. After the reaction is completed, disperse the slurry in deionized water, use 0.07M ethanol solution containing 4-coumaric acid to adjust the pH value of the system to neutral, and wash away unresolved impurities with deionized water. After reacting the reagents, homogenize under high pressure to obtain a uniform Q-NFC water dispersion.

Embodiment 2

[0027] The method for preparing antibacterial Q-NFC at room temperature is as follows:

[0028] Weigh 0.2g NaOH and dissolve in 3.5g solid content of 28wt% bleached wet bamboo pulp, stir until evenly mixed, add 2.9g 2,3-epoxypropyltrimethylammonium chloride (EPTAC), fully mix After homogenization, place it at room temperature to react for 1 hour. After the reaction is completed, disperse the slurry in deionized water, use 0.1M ethanol solution containing 4-coumaric acid to adjust the pH value of the system to neutral, and wash it away with deionized water. After unreacted reagents, high-pressure homogenization to obtain a uniform Q-NFC aqueous dispersion.

Embodiment 3

[0030] The method for preparing antibacterial Q-NFC at room temperature is as follows:

[0031] Weigh 0.2g NaOH and dissolve it in 3.3g of bleached wet bamboo pulp with a solid content of 30wt%, stir until evenly mixed, add 4.3g 2,3-epoxypropyltrimethylammonium chloride (EPTAC), and mix thoroughly After homogenization, place it at room temperature to react for 1 hour. After the reaction is completed, disperse the slurry in deionized water, use 0.1M ethanol solution containing 4-coumaric acid to adjust the pH value of the system to neutral, and wash it away with deionized water. After unreacted reagents, high-pressure homogenization to obtain a uniform Q-NFC aqueous dispersion.

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Abstract

The invention discloses a preparation method of bacteriostatic cationic nanofibrillated cellulose (Q-NFC). According to the method disclosed by the invention, quaternization pretreatment is carried out on cellulose slurry with a water content of 15-50% under a room-temperature and alkaline condition, the pH value of the reaction system is neutralized to be neutral by using an alcohol solution dissolved with a natural antibacterial organic acid, and finally mechanical treatment is carried out to obtain a bacteriostatic nanofibrillated cellulose (NFC) water dispersion liquid. The preparation method of the bacteriostatic NFC is mild and efficient, and active organic acid bacteriostatic groups with negative charges are bonded on the surface of cationic microfibers in a mode of ionic bonds, sothat the prepared bacteriostatic NFC has a good bacteriostatic effect, and the bacteriostasis rate to staphylococcus aureus can be up to 99% or above. The bacteriostatic Q-NFC retains the original advantages of natural toxicity, degradability, high transparency, good thermal stability and the like of NFC, and also has the advantages that active bacteriostatic components cannot be dissolved out easily and the like, so that the bacteriostatic Q-NFC can be applied to the fields of bacteriostatic active packaging, functional textile materials and the like.

Description

technical field [0001] The invention relates to a preparation method of nanofibrillated cellulose, in particular to a preparation method of antibacterial cationic nanofibrillated cellulose. Background technique [0002] In recent years, as consumers pay more and more attention to food safety, the demand for environmentally friendly packaging materials is increasing, and the development of biodegradable packaging materials with good antibacterial or bacteriostatic properties has gradually become a research topic in the field of active packaging. one of the directions. [0003] In order to prevent food from being contaminated by bacteria and avoid potential harm to human health caused by excessive addition of preservatives, antibacterial agents can be added to food packaging materials to inhibit the growth of bacteria in food. Antibacterial agents are divided into two types: inorganic antibacterial agents and organic antibacterial agents. Inorganic antibacterial agents includ...

Claims

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Application Information

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IPC IPC(8): C08B11/145
CPCC08B11/145
Inventor 刘宏治茹静单鹏嘉
Owner ZHEJIANG FORESTRY UNIVERSITY
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