Method for preparing cellulose nanocrystals

A nano-microcrystalline and cellulose technology, applied in the continuous pulping process, pulping with acid acid/anhydride, etc., can solve the problems of high corrosion, high cost, and difficulty in industrialized production, and achieve lower concentration requirements and basic The effect of increased group activity

Inactive Publication Date: 2013-01-16
WUXI KAILI PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acid hydrolysis requires a high concentration of strong acid, which is highly corrosive and expensive; the degradation efficiency of enzymatic hydrolysis is low, and it is difficult to realize industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Put 3g of refined cotton linters into water with a mass of 30g, and place it in an ultrasonic generator for ultrasonic stirring for 8 hours;

[0015] (2) Continue to add 15 g of 0.5 mol / L sulfuric acid aqueous solution and 18 g of 0.5 mol / L hydrochloric acid aqueous solution to the ultrasonic generator, keep stirring, and sonicate at 30°C for 12 hours;

[0016] (3) Wash the solid product obtained in step (2) with water until the pH value is 6-7.

Embodiment 2

[0018] (1) Put 3g of refined cotton linters into water with a mass of 45g, and place it in an ultrasonic generator for ultrasonic stirring for 6 hours;

[0019] (2) Continue to add 21 g of 0.5 mol / L sulfuric acid aqueous solution and 12 g of 0.5 mol / L hydrochloric acid aqueous solution to the ultrasonic generator, keep stirring, and sonicate at 50°C for 10 hours;

[0020] (3) Wash the solid product obtained in step (2) with water until the pH value is 6-7.

Embodiment 3

[0022] (1) Put 3g of refined cotton linters into 60g of water, and place it in an ultrasonic generator for ultrasonic stirring for 4 hours;

[0023] (2) Continue to add 24g of 0.5mol / L sulfuric acid aqueous solution and 6g of 0.5mol / L hydrochloric acid aqueous solution to the ultrasonic generator, keep stirring, and ultrasonicate at 60°C for 8 hours;

[0024] (3) Wash the solid product obtained in step (2) with water until the pH value is 6-7.

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PUM

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Abstract

The invention discloses a method for preparing cellulose nanocrystals. The method comprises the following steps of: (1) putting refined cotton linter into water of which the mass is 10 to 20 times that of the refined cotton linter, and performing ultrasonic stirring in an ultrasonic generator for 4 to 8 hours; (2) continuously adding a 0.5mol/L sulfuric acid aqueous solution of which the mass is 5 to 8 times that of the refined cotton linter and a 0.5mol/L hydrochloric acid aqueous solution of which the mass is 2 to 6 times that of the refined cotton linter into the ultrasonic generator, and performing ultrasonic stirring at the temperature of between 30 and 60 DEG C for 8 to 12 hours; and (3) washing a solid product obtained in the step (2) by using water until the pH value is 6 to 7. The method is simple in process and low in cost; and the prepared cellulose nanocrystals are uniform in granularity and high in performance.

Description

technical field [0001] The invention relates to the technical field of cellulose derivatives, in particular to a method for preparing nano-scale microcrystalline cellulose. Background technique [0002] Microcrystalline cellulose is a pure cellulose depolymerization product with a particle size of 20-80 μm. Made from natural cellulose, it is an odorless and tasteless crystalline powder. The product can be used as a pharmaceutical excipient and tablet disintegrating agent in the pharmaceutical industry; it can be used as an important functional food base material in the food industry—dietary cellulose, which is an ideal health food additive; in the coating industry Utilizing its thixotropy and thickening properties, it can be used as a thickener and emulsifier for water-based paints; in cosmetics, it integrates fillers, thickeners and emulsifiers, and has good emulsifying ability for oily substances; in wet process It is used as tackifier and filler in the production of art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/04D21C3/24
Inventor 杨毅跃康国伟姚程成蒙相锋鲁尧
Owner WUXI KAILI PHARMA
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