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Method for preparing chitosan and derivative nanofibers thereof by mechanical method

A technology of chitosan fiber and derivative fiber, which is applied in the field of nanomaterials, can solve the problem of single shape of nano-chitosan, and achieve the effects of purification, tight connection and simple preparation process

Inactive Publication Date: 2018-09-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method adopts chitosan fiber or chitosan derivative fiber as the main raw material. The method adopts the basic process of pulping production of papermaking fiber, and has the advantages of simple process, continuous production, the use of chitosan fibrous raw material as the basic production raw material, and low cost. Low-level advantages, overcome the shortcomings of existing products such as complicated operation, single form of nano-chitosan, and ultra-low temperature environment required for preparation; at the same time, the process technology and equipment in the papermaking beating production process are very mature, the requirements for raw materials are relatively low, and most of the participating media It can be reused, which is conducive to reducing costs and realizing industrial production, which can effectively promote the wide application of nano-chitosan fibers

Method used

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  • Method for preparing chitosan and derivative nanofibers thereof by mechanical method
  • Method for preparing chitosan and derivative nanofibers thereof by mechanical method
  • Method for preparing chitosan and derivative nanofibers thereof by mechanical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First cut 30 grams of chitosan fibers into 1mm-3mm lengths, put them into deionized water to fully absorb water and moisten them for 8 hours, then pour the slurry into the filter screen and knead the water, and let the dewatered slurry stand still Balance the moisture for 2 hours, measure the water content of the slurry after balancing the moisture, adjust the dryness of the slurry to 10wt%, use a PFI refiner to perform a beating treatment at 50,000 rpm, and put the beaten pulp fibers into deionized water , dispersed into a slurry suspension with a concentration of 0.3wt%, and put the suspension into a decomposer to decompose the fibers so that the fibers are evenly dispersed in the water. Pour the uniformly dispersed fiber turbid liquid into a homogenizer for homogenization, and after homogenizing for 5 times, the nano-chitosan fiber emulsion can be obtained. figure 1 It is the TEM image of nano-chitosan fiber in Example 1 (where a, b, and c correspond to different mag...

Embodiment 2

[0030] First cut 30 grams of chitosan derivative fibers into 30mm lengths, put them into 10wt% alkaline solution and soak for 1 hour, then pour the slurry into the filter screen and rinse with water for several times until the washing liquid becomes weakly alkaline, squeeze Remove the water, leave the dewatered slurry to balance the moisture for 2 hours, measure the water content of the slurry after the equilibrium moisture, adjust the dryness of the slurry to be 10wt%, and use a PFI refiner to perform 80,000 rpm beating treatment on it. Put the beaten pulp fiber into deionized water, disperse into a slurry suspension with a concentration of 0.01wt%, and put the suspension into a deflagger to decompose so that the fiber is evenly dispersed in the water. Pour the uniformly dispersed fiber turbid liquid into a homogenizer for homogenization. After 40 times of homogenization, the nano-chitosan fiber emulsion can be obtained. The diameter of the nano-chitosan fiber has also reached...

Embodiment 3

[0032] First cut 30 grams of chitosan fibers into lengths of 3mm-5mm, put them in 0.05wt% acidic solution and soak for 0.5h, then pour the slurry into the filter screen and rinse it with water for several times until the washing liquid becomes weakly acidic, squeeze Remove the water, leave the dewatered slurry to balance the moisture for 2 hours, measure the water content of the slurry after the equilibrium moisture, adjust the dryness of the slurry to be 10wt%, and use a cylindrical refiner to carry out 50000 rpm beating treatment to it. Put the beaten pulp fiber into deionized water, disperse into a slurry suspension with a concentration of 1wt%, and put the suspension into a decomposer to decompose the fiber so that the fiber is evenly dispersed in the water. Pour the evenly dispersed fiber turbid liquid into a homogenizer for homogenization. After 20 times of homogenization, nano-chitosan fiber emulsion can be obtained, such as figure 2 , the diameter of nano-chitosan fib...

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Abstract

The invention discloses a method for preparing chitosan and derivative nanofibers thereof by a mechanical method. The method comprises the steps: firstly pre-treating a suitable length of chitosan fibers or chitosan derivative fiber materials (called as chitosan fibers for short) by adding into water or an appropriate concentration of an alkali solution or an acid solution, and then grinding the treated fibers (preferably pulping equipment in a pulping and papermaking process), obtaining micron-sized chitosan fibers, and finally homogenizing the micron-sized chitosan fiber by high pressure toobtain nano-chitosan fibers. From an electron micrograph, the prepared chitosan fibers reach a nanometer level. The method is simple in operation and convenient for industrialized production, and theprepared new nano-chitosan fibers have broad application prospects in the aspects of biomedical, daily chemical and special materials.

Description

technical field [0001] The invention relates to the fields of daily chemicals, biomedicine and other nanometer materials, in particular to a method for mechanically preparing nanofibers of chitosan and derivatives thereof. Background technique [0002] Chitosan (Chitosan), also known as soluble chitin, chitosan, chitosan, etc., the chemical name is 2-amino-β-1,4-glucan, which is a product obtained after deacetylation of chitin. A natural cationic polysaccharide, chitosan and its derivatives have good biocompatibility, degradability, hygroscopicity, non-toxicity, antibacterial, fibrillation, film-forming properties and certain antibacterial and antitumor properties , has broad application prospects in the fields of medicine, food, textiles, daily chemicals, and environmental protection. Chitosan is widely distributed in nature and has the reputation of universal polysaccharide. It is a cheap and easy-to-obtain raw material. At present, nano-chitosan materials mainly use emu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/00D21H13/30B82Y40/00
CPCB82Y40/00D01F9/00D21H13/30D21B1/021D21C9/007D21C11/0007D21D1/00D21H11/18D21B1/34
Inventor 赵光磊张思晗李晓凤
Owner SOUTH CHINA UNIV OF TECH