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Preparation method and application of micro-nano cellulose

A technology of micro-nano cellulose and plant fibers, applied in the field of materials, can solve the problems of high energy consumption, incomplete reaction, low yield, etc., and achieve the effect of good particle size uniformity

Active Publication Date: 2019-01-15
刘永红 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] All of the above methods have the disadvantages of low yield, poor uniformity of product particle size distribution, long reaction time, high energy consumption, and incomplete reaction.

Method used

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  • Preparation method and application of micro-nano cellulose
  • Preparation method and application of micro-nano cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The hydrolysis agent is obtained by mixing methanesulfonic acid: sulfuric acid: water = mass ratio 36:40:24.

[0039] Mix 50 grams of hydrolyzing agent and 1 gram of cotton, react at 25°C, and the reaction time is half an hour. The obtained reaction product is diluted with 10 times the volume of water and becomes light blue. After one day, there is no precipitation, indicating that the obtained product is nano-scale Cellulose, no yellowing by-products.

Embodiment 2

[0041] The hydrolysis agent is obtained by mixing methanesulfonic acid: sulfuric acid: water = mass ratio 36:40:24.

[0042] Mix 50 grams of hydrolyzing agent and 1.5 grams of hardwood pulp (poplar wood pulp) and react at 25°C for half an hour. The obtained reaction product is diluted with 10 times the volume of water and becomes light blue, and there is no precipitation after standing for one day , indicating that nanoscale cellulose was obtained without yellowing by-products.

[0043] Note: The crystallinity of hardwood cellulose is only over 50%, and the crystallinity of cotton cellulose is above 90%. Hardwood cellulose is more easily hydrolyzed by acid.

Embodiment 3

[0045] The hydrolysis agent is obtained by mixing methanesulfonic acid: sulfuric acid: water = mass ratio 36:40:24.

[0046] Mix 50 grams of hydrolyzing agent and 1.5 grams of ground wood powder (200 mesh coniferous wood powder, pine wood powder) and react at 25°C for half an hour. No carbonization; the reaction product was centrifuged at 5000 rpm for 5 minutes to remove the acid-insoluble lignin in the upper layer; then 50 ml of the supernatant was removed and mixed with 5 grams of activated carbon, shaken for three minutes for decolorization, and after standing for more than one day, it was determined that A light blue non-precipitating solution indicated that nanocellulose was obtained. Nanocellulose and acid-insoluble lignin can also be separated by ceramic nanofiltration membrane, and the lignin obtained in this way is also of great market value.

[0047] Note: The crystallinity of coniferous wood cellulose is about 70%, which is lower than that of cotton cellulose and e...

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Abstract

The invention discloses a preparation method and application of micro nano cellulose. The preparation method comprises the steps of: hydrolyzing plant fiber by a hydrolyzing agent to obtain the micronano cellulose; wherein the hydrolyzing agent is composed of (meth)sulfonic acid, sulfuric acid and water. The preparation method is thorough in reaction, and the prepared micro nano cellulose has good particle size uniformity, and the method can be applied in industrial production of the micro-nano cellulose.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a preparation method and application of micro-nano cellulose. Background technique [0002] Cellulose is one of the most abundant natural renewable resources in the world and widely exists in various forms of renewable biomass materials, such as trees, grasses, etc. In recent years, micro-nanocellulose, as a crystalline form of cellulose, has been widely used due to its excellent properties (such as nanoscale size, high specific surface area, good hydrophilicity, biodegradability, high tensile strength and stiffness, etc.) much attention. [0003] As a kind of green material, nanocellulose has broad application prospects. Based on nanocellulose, many high value-added products can be derived, such as pigments, varnishes, coatings, adhesives, drilling fluids and other fluids, polymer strengthening additives, hydrogels, cosmetics, and pharmaceutical additives; and nanocomposites Material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 刘永红
Owner 刘永红
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