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Nanocellulose and preparation method thereof

A technology of nano-cellulose and lignocellulose, applied in the field of cellulose, can solve the problems of long cycle time, chemical treatment of environmental pollution, fiber performance reduction, etc., and achieve excellent network structure, high economic benefits and utilization prospects, high long-diameter than the effect

Active Publication Date: 2016-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the period required for enzyme treatment is very long, and chemical treatment faces environmental pollution and fiber performance degradation, etc.

Method used

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  • Nanocellulose and preparation method thereof
  • Nanocellulose and preparation method thereof
  • Nanocellulose and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The nanocellulose that this embodiment pours, its preparation method comprises the following steps:

[0044] (1) Steam explosion treatment

[0045] Select bagasse after sugar extraction with a size between 5-60 meshes, add appropriate amount of water, adjust its moisture content to 45% (mass fraction), seal and place for 12 hours, and then use a steam explosion device to carry out steam explosion treatment on the above-mentioned bagasse fibers ( Temperature 220 ℃, pressure 2.3MPa), the lignocellulosic fiber after steam explosion is placed in 70 ℃ blast drying box and dries 12h, obtains lignocellulose fiber A ( figure 1 ), sealed and stored for later use.

[0046] (2) High temperature water cooking

[0047] Weigh 20g of lignocellulose fiber A and put it into the reactor (500ml), then add 300ml of deionized water, 45ml of absolute ethanol, and 1g of NaOH, and seal the reactor after mixing evenly. Subsequently, the reactor was placed in an oil bath at 180° C. for 40 min...

Embodiment 2

[0057] The nanocellulose of the present embodiment, its preparation method comprises the following steps:

[0058] (1) Steam explosion treatment

[0059] The eucalyptus chips were crushed into coarse lignocellulose fibers of 2-60 meshes by using a claw crusher, an appropriate amount of water was added to adjust the moisture content of the fibers to 50% (mass fraction), and sealed for 12 hours. Subsequently, the above-mentioned lignocellulose fibers were subjected to steam explosion treatment (temperature 150° C., pressure 0.47 MPa). Dry the exploded lignocellulose fibers in a blast oven at 70°C for 12 hours to obtain lignocellulose fibers A, which are sealed and stored until use.

[0060] (2) High temperature water cooking

[0061] Weigh 15g of the lignocellulose fiber A and put it into a reactor (500ml), add 300ml of deionized water, 30ml of absolute ethanol, and 1.5g of NaOH, and seal the reactor after mixing evenly. Subsequently, the reactor was placed in an oil bath at ...

Embodiment 3

[0071] The nanocellulose of the present embodiment, its preparation method comprises the following steps:

[0072] (1) Steam explosion treatment

[0073] Take the sisal fiber and crush it into small pieces of about 10-30 mesh, add an appropriate amount of water, adjust the moisture content of the fiber to 55% (mass fraction), and place it sealed for 12 hours. Subsequently, steam explosion treatment (temperature 130° C., pressure 0.27 MPa) was carried out to the above-mentioned sisal fibers by using a steam explosion device. Dry the exploded lignocellulose fibers in a blast oven at 70°C for 12 hours to obtain lignocellulose fibers A, which are sealed and stored until use.

[0074] (2) High temperature water cooking

[0075] Weigh 20g of lignocellulose fiber A and put it into a reactor (500ml), add 300ml of deionized water, 30ml of absolute ethanol, and 3.5g of NaOH, mix well and seal the reactor. Subsequently, the reactor was placed in an oil bath at 210° C. for 15 minutes, ...

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Abstract

The invention discloses nanocellulose and a preparation method thereof. The preparation method comprises the following steps: carrying out steam explosion treatment, stewing with high-temperature water under alkali-ethanol catalysis, bleaching with H2O2 and dispersing with mechanical force. In the preparation method, only a small amount of low-concentration alkali, a small amount of ethanol and H2O2 are consumed; the consumption of chemicals in pretreatment of fiber is obviously reduced; the pollution to the environment is greatly reduced; meanwhile, the damage of a large quantity of chemical reagents to the nanocellulose structure is avoided; the structure of the nanocellulose is protected; energy consumption in the subsequent mechanical treatment process is reduced; the preparation efficiency of the nanocellulose is improved; the nanocellulose prepared by the method is 10-40nm in diameter and has a high length-diameter ratio and an excellent net structure.

Description

technical field [0001] The invention relates to the field of cellulose, in particular to a nanocellulose and a preparation method thereof. Background technique [0002] Cellulose is the main component of plant fibers, accounting for about 40-50% of the total amount of phytochemicals. The annual production of cellulose on the earth can reach 75 billion tons. It is the most abundant renewable biopolymer in nature. Nanocellulose is a cellulose-like substance with at least one dimension at the nanoscale. It has a wide range of sources, and almost all natural fibers can be used as raw materials for preparing nanocellulose. Nanocellulose has low thermal expansion coefficient, high specific area, good mechanical properties and optical properties, and has broad application prospects in the fields of nanocomposites, coatings, cosmetics, food packaging and biomedicine. [0003] In the plant fiber cell wall, cellulose microfibril bundles are wrapped in hemicellulose and lignin, and c...

Claims

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Application Information

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IPC IPC(8): D21B1/02D21B1/30
CPCD21B1/02D21B1/021D21B1/30
Inventor 冯彦洪程天宇周玉娇
Owner SOUTH CHINA UNIV OF TECH
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