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Method of preparing microfibrillated cellulose from bamboo parenchyma cells

A technology of parenchyma cells and cellulose, which is applied in the fields of fiber raw material processing, pulping with organic solvents, textiles and papermaking, etc. It can solve the problems of cavitation fragmentation, high production energy consumption, and numerous operation steps, and the method is simple Easy to operate, reduce environmental pollution and high efficiency

Inactive Publication Date: 2015-08-12
INT CENT FOR BAMBOO & RATTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain nanocellulose with a high aspect ratio (≥600), there are many steps in the method, and ultrasonic treatment is only used as a pretreatment for high-pressure homogenization, which fails to fully exert its cavitation crushing effect and consumes much energy in production. Higher (application number: 201180063585.6, name: method and equipment for producing nanocellulose)

Method used

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  • Method of preparing microfibrillated cellulose from bamboo parenchyma cells
  • Method of preparing microfibrillated cellulose from bamboo parenchyma cells
  • Method of preparing microfibrillated cellulose from bamboo parenchyma cells

Examples

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Effect test

experiment example

[0032] Spread the residues of bamboo floor processing evenly, dry naturally in a cool place for 10 hours, then place in a drying box, dry to absolute dryness at 103±1°C, crush in a plant grinder for 15 minutes, and then use 100 mesh, 120 mesh, 200 mesh respectively The objective sieve was sieved three times, and the particles passing through the sieve were collected and observed with a scanning electron microscope.

[0033] figure 1 It is the SEM picture of the raw material obtained through three mesh sieves (A: 100 mesh; B: 120 mesh; C: 200 mesh; magnification × 100); from figure 1It can be clearly seen that after 100 mesh and 120 mesh sieving, there are still a small amount of fibers in the raw material, while the raw material passing 200 mesh is basically parenchyma cells. Therefore, the following examples are all sieved with a 200-mesh sieve.

Embodiment 1

[0034] Example 1 Preparation of Microfibrillated Cellulose by High Frequency Ultrasound from Phyllostachys pubescens Parenchyma Cells

[0035] Moso bamboo is a kind of scattered bamboo.

[0036] 1) First, split the moso bamboo into small bamboo stalks the size of a matchstick, then treat the small bamboo stalks in a mixture of hydrogen peroxide and glacial acetic acid (1:1 by volume) at 60°C for 18 hours; after the isolation treatment, Wash with deionized water several times until neutral, then place it in a container filled with a large amount of deionized water, and stir vigorously for 30 minutes to obtain a single-cell aqueous suspension; the aqueous suspension is filtered 3 times with a 200-mesh sieve, and the obtained After the filtrate is dried, parenchyma cells can be obtained;

[0037] 2) Chemical pretreatment: add the parenchyma cells obtained in step 1) into 1% (mass) sodium chlorite solution, place them in a water bath at 70° C. for 1 hour, and repeat this process ...

Embodiment 2

[0040] Example 2 Preparation of Microfibrillated Cellulose by High Pressure Homogenization of Phyllostachys pubescens Parenchyma Cells

[0041] 1) separation of parenchyma cells, same as in Example 1;

[0042] 2) chemical pretreatment, with embodiment 1;

[0043] 3) Disperse the chemically treated parenchyma cells in step 2) into deionized water to form a 1% (mass) slurry. The working pressure of the high-pressure homogenizer is 150 MPa, and the diameter of the cavity is 100 μm. The slurry is repeatedly subjected to high pressure The number of times of the homogenizer cavity is 5; after the high-pressure homogenization is completed, the obtained transparent liquid is the microfibrillated cellulose sol.

[0044] After drying, observed by scanning electron microscope, see figure 2 . The diameter of the obtained microfibrillated cellulose is defined between 50-200nm.

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Abstract

The invention discloses a method of preparing microfibrillated cellulose from bamboo parenchyma cells, which comprises following steps: (1) separation of the bamboo parenchyma cells: performing chemical separation or drying and crushing process to raw materials, sieving the treated raw materials through a 20-mesh sieve screen to obtain the parenchyma cells; (2) chemical pre-treatment: adding the parenchyma cells to a phenethyl alcohol solution for extraction, adding a 1-3% sodium chlorite solution for treating the parenchyma cells for one hour, and adding the parenchyma cells in an alkaline solution for treating the parenchyma cells for two hours, treating the parenchyma cells in a diluted hydrochloric acid solution for two hours, and finally washing the parenchyma cells with deionized water to neutralization; and (3) dispersing the treated parenchyma cells in deionized water to form a 1% suspension liquid, and performing high-frequency ultrasonic treatment or high-pressure homogenizing treatment. According to the method, the bamboo parenchyma cells are separated through the sieving process in early stage to prepare the microfibrillated cellulose. The raw materials are wide in sources and are low in cost. The method is simple and easy to carry out, is high in production efficiency, can reach 90% in yield and can basically achieve all-conversion of the raw materials.

Description

technical field [0001] The invention belongs to the field of utilization of bamboo resources, in particular to a method for preparing microfibrillated cellulose from bamboo parenchyma cells. Background technique [0002] my country is the country with the most abundant bamboo resources in the world. The development of bamboo industry plays an important role in alleviating the contradiction of timber supply and providing added value for plantation utilization. According to reports, the total output value of my country's bamboo industry in 2012 has reached 122.4 billion yuan. Bamboo is mainly composed of three parts: fibrous tissue, parenchyma and conducting tissue, wherein parenchyma accounts for about 52%, fibrous tissue accounts for about 40%, and conducting tissue only accounts for about 8% (Xu Youming, Bamboo Properties and Research progress on the development and utilization of its resources. Journal of Northeast Forestry University, 2003,31(5):71-77). The industrial ut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/20D21C5/00
CPCD21C3/20D21C5/00
Inventor 王汉坤江泽慧余雁张雪霞李万菊任丹于子绚
Owner INT CENT FOR BAMBOO & RATTAN
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