Method for extracting nano-crystalline cellulose microfiber from cotton stalk bark

A technology of nano-cellulose and cotton stalk skin, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve environmental problems such as pollution, waste of resources, etc., and achieve the effects of solving environmental pollution problems, easy degradation, and increasing economic benefits

Inactive Publication Date: 2016-05-18
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for extracting nano-cellulose microfibers from cotton stalk husks, thereby solving the problems of waste of resources and environmental pollution caused by burning cotton stalk husks in the prior art

Method used

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  • Method for extracting nano-crystalline cellulose microfiber from cotton stalk bark
  • Method for extracting nano-crystalline cellulose microfiber from cotton stalk bark
  • Method for extracting nano-crystalline cellulose microfiber from cotton stalk bark

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Wash 15g of cotton stalk skin with water and place in 3ml / LH 2 SO 4 Boil in acid at 60°C for 2.5 hours, and the bath ratio is 1:30. Then remove the cotton stalk from the H 2 SO 4 Take it out, wash it with water, remove the outer skin of the cotton stalk skin, and then put the cotton stalk skin in 8g / LNaOH, 8ml / LH 2 o 2 Boil in the mixed solution at 70°C for 2 hours, and the bath ratio is 1:100. Remove the cotton stalk skin from the mixed solution and wash it with water, then gently tap it along the axial direction of the cotton stalk skin with a rubber hammer, beat out the pulp in the cotton stalk skin, then wash it with clean water, and repeat the beating-cleaning process 10 Second-rate. Then put the cotton stalk skin of the pulp into 12g / LNaOH, 12ml / LH 2 o 2 Boil in the mixed solution at 80°C for 1 hour, and the bath ratio is 1:100. Remove the cotton stalk skin from the mixed solution and place it in 0.5ml / LH 2 SO 4 Soak it for 10 minutes, then take out the...

Embodiment 2

[0028] Wash 15g of cotton stalk skin with water and place in 2ml / LH 2 SO 4 Boil in acid at 65°C for 2.5 hours, and the bath ratio is 1:25. Then remove the cotton stalk from the H 2 SO 4 Take it out, wash it with water and remove the outer skin of the cotton stalk skin, then put the cotton stalk skin in 5g / LNaOH, 5ml / LH 2 o 2Boil in the mixed solution at 75°C for 2 hours, and the bath ratio is 1:100. Remove the cotton stalk skin from the mixed solution and wash it with water, then gently tap it along the axial direction of the cotton stalk skin with a rubber hammer, beat out the pulp in the cotton stalk skin, then wash it with clean water, and repeat the beating-cleaning process 10 Second-rate. Then put the cotton stalk skin of the pulp into 12g / LNaOH, 12ml / LH 2 o 2 Boil in the mixed solution at 85°C for 1 hour, and the bath ratio is 1:100. Remove the cotton stalk skin from the mixed solution and place it in 0.3ml / LH 2 SO 4 Soak it for 15 minutes, then take out the c...

Embodiment 3

[0032] Wash 15g of cotton stalk skin with water and place in 4ml / LH 2 SO 4 Boil in acid at 55°C for 2.5 hours, and the bath ratio is 1:30. Then remove the cotton stalk from the H 2 SO 4 Take it out, wash it with water, remove the outer skin of the cotton stalk skin, and then put the cotton stalk skin in 10g / LNaOH, 10ml / LH 2 o 2 Boil in the mixed solution at 65°C for 2 hours, and the bath ratio is 1:100. Remove the cotton stalk skin from the mixed solution and wash it with water, then gently tap it along the axial direction of the cotton stalk skin with a rubber hammer, beat out the pulp in the cotton stalk skin, then wash it with clean water, and repeat the beating-cleaning process 10 Second-rate. Then put the cotton stalk skin of the pulp into 15g / LNaOH, 15ml / LH 2 o 2 Boil in the mixed solution at 75°C for 1 hour, and the bath ratio is 1:120. Remove the cotton stalk skin from the mixed solution and place it in 0.6ml / LH 2 SO 4 Soak it for 10 minutes, then take out t...

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Abstract

The invention provides a method for extracting nano-crystalline cellulose microfiber from cotton stalk bark. The method comprises the steps of cotton stalk bark desizing, wherein cotton stalk bark is placed into a NaOH and H2O2 mixed solution to be boiled at the temperature of 65-75 DEG C and repeatedly knocked and cleaned after being fished out till pulp is removed; desized cotton stalk bark alkali treatment, wherein the desized cotton stalk bark is placed into a 3-30% NaOH solution for alkali boiling, fished out and dried; desized cotton stalk bark TEMPO oxidation, wherein the desized cotton stalk bark is oxidized in a TEMPO/NaClO2/NaBr oxidation system, NaOH is added dropwisely so as to maintain the pH value to be 10.2-10.8, ethyl alcohol is added dropwisely after a reaction is stopped, and centrifuging is performed to obtain the nano-crystalline cellulose microfiber. According to the method, the cotton stalk bark is used as raw materials creatively for the first time, preparation of the nano-crystalline cellulose microfiber is achieved, the waste cotton stalk bark is recycled, the problem of environmental pollution brought by burning cotton stalk bark is solved, and the finally-obtained nano-crystalline cellulose microfiber is controlled to be of the nanoscale size successfully.

Description

technical field [0001] The invention relates to the field of nano-cellulose microfibers, and more particularly relates to a method for extracting nano-cellulose microfibers from cotton stalk bark. Background technique [0002] Nanocellulose microfiber is a new type of functional polymer material with the most abundant content in nature. Due to its renewable and easy biodegradation, as well as its good biocompatibility, excellent mechanical properties and good modifiability, it makes It has a wide range of potential applications in many fields, such as: biology, paper industry, medicine, purification, conduction, food industry and composite materials. With the severe shortage of resources and people's increasing emphasis on environmental protection, it is extremely important to effectively develop and utilize this cheap and abundant green renewable resource. [0003] my country is a big cotton-producing country, and the output of cotton stalks is also huge, but most of the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 缪夏然林金友田丰边风刚王劼
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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