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Method for preparing micro nano-crystalline cellulose with mechanical force chemical method

A micro-nano cellulose and mechanochemical technology, applied in the field of materials, can solve the problems of not being in a lively chemically active state, combining at the same time, low chemical reaction efficiency and rate, etc., to achieve low cost, reduce energy consumption, Easy-to-use effects

Active Publication Date: 2012-05-02
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above two methods (2) and (3) only use mechanical ball milling method or chemical method to pre-treat cellulose to prepare nano-cellulose, but do not combine the effects of mechanical force and chemical force on substances at the same time, and fail to Make full use of the synergistic effect of mechanical force, thermal force and chemical force, so that the whole system cannot be in a lively chemically active state, and the efficiency and rate of chemical reactions are not high

Method used

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  • Method for preparing micro nano-crystalline cellulose with mechanical force chemical method
  • Method for preparing micro nano-crystalline cellulose with mechanical force chemical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1g of chemical pulp (sulphate wood pulp, purchased from Nanping Paper Mill), add to 5g of H2O with a mass fraction of 85% 3 PO 4 solution, put the above materials into a vibrating ball mill, and grind continuously for 1 hour to obtain transparent cellulose / H 3 PO 4 Mixture. Add an appropriate amount of water to precipitate the cellulose and obtain a white jelly. Add water to the white jelly and centrifuge, remove the lower layer of cellulose jelly to obtain micro-nano cellulose with a yield of 97%. It can be seen from the transmission electron micrograph observation that the micronano cellulose prepared by this method has a diameter of 20-30nm, a length of 300-700nm, and a network structure. like figure 1 shown.

[0028] Horizontal grinder or colloid mill

Embodiment 2

[0030] Take by weighing 20g microcrystalline cellulose, add to 400g massfraction 1% H 2 SO 4 / HCl mixed solution, stirred and milled for 20min to obtain cellulose / H 2 SO 4 / HCl mixture. Add an appropriate amount of water and centrifuge to separate layers (centrifugal speed is 6000 rpm, 10 minutes each time), and after removing the upper layer solution, the lower layer of cellulose jelly is micro-nano cellulose, with a yield of 94%.

Embodiment 3

[0032] Weigh 5 g of absorbent cotton, add it to 100 g of NaOH solution with a mass fraction of 50%, and vibrate and grind for 30 min to obtain a cellulose / NaOH mixture. Add an appropriate amount of water and centrifuge to separate layers (centrifugal speed is 10,000 rpm, 6 minutes each time). After removing the upper layer solution, the lower layer of cellulose jelly is micro-nano cellulose, and the yield is 95%.

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Abstract

The invention discloses a method for preparing micro nano-crystalline cellulose with a mechanical force chemical method. The micro nano-crystalline cellulose is obtained by mixing and grinding cellulose and a chemical aid. The method has the advantages of small using amount of chemical aid, easiness for operating and low energy consumption. Due to the adoption of the mechanical force chemical method for preparing the micro nano-crystalline cellulose, the synergistic effect of mechanical force, thermal force and chemical force generated in the process can be fully utilized by the cellulose under the multiple actions of mechanical force, thermal force and chemical force, a system is in the chemical active state, the reaction activation energy is reduced, and the occurrence and performance of a chemical reaction are catalyzed and excited. The aim of well preparing a large amount of micro nano-crystalline cellulose quickly in a saving way is fulfilled.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a method for preparing micro-nano cellulose by mechanochemical method. Background technique [0002] Cellulose is the most abundant renewable resource on the earth, and its performance improvement and utilization have become a research hotspot in recent years. Cellulose can be degraded by acid hydrolysis, enzyme treatment and mechanical method to produce micro-nano cellulose. Micro-nanocellulose has many excellent properties, such as high purity, high degree of polymerization, high crystallinity, high hydrophilicity, high Young's modulus and high transparency, etc. In view of the excellent properties of micro-nanocellulose, its , medicine, food, composite materials and other fields have good potential applications. [0003] The preparation methods of micro-nanocellulose reported in the literature mainly include: [0004] (1) Using cotton fiber as raw material, use inorgani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 黄彪林雯怡欧文唐丽荣陈学榕陈燕丹卢麒麟
Owner FUJIAN AGRI & FORESTRY UNIV
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