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Micro-nano cellulose preparation method

A technology of micro-nano cellulose and cellulose, which is applied in the fields of fiber raw material processing, textile and papermaking, raw material separation, etc., and can solve problems such as increasing the difficulty of product separation, difficulty in ensuring nano-cellulose products, and limiting the application of micro-nano cellulose

Active Publication Date: 2015-01-21
施波波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the wide application prospects of micro-nanocellulose, it has attracted many people's research interest, and there are also many patents related to nanocellulose, but all these methods for preparing nanocellulose are inevitably more or less used. Chemical agents, which not only increase the difficulty of product separation, but also make it difficult to ensure that the final nanocellulose product is completely free of residues of these agents, which greatly limits the application of micro-nanocellulose

Method used

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  • Micro-nano cellulose preparation method

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Effect test

Embodiment 1

[0022] The natural cellulose material is made into micro-nano cellulose by a purely physical method, including the following steps:

[0023] (1) Get natural cellulose material, such as 100 grams of refined cotton or wood pulp, first through high-energy electron beam irradiation, the irradiation dose is 50-350kGy, and the best high-energy electron beam irradiation dose is 150-250kGy;

[0024] (2) After the above steps, use an impact mill to dry coarsely pulverize the irradiated refined cellulose to obtain microcrystalline cellulose with an average fineness of 20-400 mesh, considering the comprehensive cost and comprehensive pulverization Efficiency, the best fineness of cellulose is 100-300 mesh;

[0025] (3) After the above steps, add these coarse cellulose powders to 99 times of water, and after mixing evenly, add them into the feeding chamber with power ultrasonic pretreatment for ultrasonic dispersion and preactivation;

[0026] (4) After the above steps, enter the water m...

Embodiment 2

[0028] Use 100 grams of refined cotton, first irradiated by high-energy electron beams, and the irradiation dose is 150kGy. These irradiated refined cottons were coarsely pulverized with an impact pulverizer to obtain microcrystalline cellulose with an average fineness of 200 mesh. Then add these coarse cellulose powders to 99 times of water, after mixing evenly, add them into the feeding chamber with power ultrasonic pretreatment for ultrasonic dispersion and pre-activation, and then enter the colloid mill for fine pulverization, repeated cycles Pulverize to finally obtain the micro-nano cellulose product, the concentration of its aqueous dispersion is 1% (weight %), and it is a white paste.

[0029] The final fineness of the micro-nano cellulose reaches between 100-600nm.

Embodiment 3

[0031] Use 100 grams of paper pulp and irradiate it with a high-energy electron beam at a dose of 250 kGy. These irradiated refined cottons were coarsely pulverized with an impact pulverizer to obtain microcrystalline cellulose with an average fineness of 240 mesh. Then add these coarse cellulose powders to 99 times of water, after mixing evenly, add them into the feeding chamber with power ultrasonic pretreatment for ultrasonic dispersion and pre-activation, and then enter the colloid mill for fine pulverization, repeated cycles Pulverize to finally obtain the micro-nano cellulose product, the concentration of its aqueous dispersion is 1% (weight %), and it is a white paste.

[0032] The final fineness of the micro-nano cellulose reaches between 80-500nm.

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Abstract

The invention relates to a micro-nano cellulose preparation method, and especially relates to a micro-nano cellulose preparation method using pure physical method. According to the method, first natural cellulose is irradiated by high-energy electron beam, the internal structure is destructed, the irradiated cellulose material is coarsely crushed by mechanical dry method, and then is finely crushed by water grinding method to finally obtain micro-nano cellulose; and the aqueous dispersion liquid concentration is 0.01-1% (wt%). A water grinding fine crushing device is a colloid mill, or a colloid mill modified with a power ultrasonic pretreatment feed cavity, the final micro-nano cellulose fineness can reach 5-600nm, and the preparation process is environment-friendly without any chemical wastewater, and has the advantages of simple process and good repeatability.

Description

technical field [0001] The invention relates to a method for preparing micro-nano cellulose, in particular to a method for preparing micro-nano cellulose by a purely physical method. Background technique [0002] Cellulose exists widely in nature and is an inexhaustible and the largest renewable resource in the world. Today, when the world's petroleum, coal and natural gas resources are increasingly depleted, the use of green and environmentally friendly cellulose as a chemical raw material and intermediate has become a global research hotspot. [0003] Natural cellulose has a wide range of molecular weight distribution, ranging from hundreds of thousands to millions, and has a high degree of crystallinity. Nanocrystalline cellulose is an artificially produced form of fine cellulose, and its manufacturing method is disclosed in detail in the Chinese invention patent publication (publication number: 1334272, publication number: 1369508), but the method used is not purely phy...

Claims

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Application Information

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IPC IPC(8): D21C5/00
CPCD21B1/30
Inventor 施波波
Owner 施波波
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