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Preparation method for micro-nano-cellulose

A technology of micro-nano cellulose and cellulose, applied in fermentation and other directions, can solve the problems of poor uniformity of micro-nano cellulose, achieve uniform size and reduce the effect of acid-base neutralization treatment

Pending Publication Date: 2017-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses biological enzymes to pretreat cellulose, and for the problem of poor uniformity of micro-nano cellulose, the steps of micro-fine refining and high-intensity micro-jet are added to make the obtained micro-nano cellulose uniform and fine

Method used

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  • Preparation method for micro-nano-cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation method of micro-nano cellulose:

[0034] (1) The citric acid-sodium citrate buffer solution of cotton pulp and pH=8.0 is mixed by solid-liquid ratio 1:25g / mL, adds the cellulase (Novozymes company model is 20IU / g with cotton pulp ratio) The cellulase of D) was shaken at 50°C for 12h to obtain a cellulose suspension, filtered and washed, and the filtrate was inactivated at a high temperature of 80°C;

[0035] (2) finely refining the cellulose treated in step (1) under a pressure of 1000 Bar to obtain a micron cellulose slurry with a slurry concentration of 18 wt %;

[0036] (3) The micron cellulose slurry was subjected to a high-strength micro-jet homogenization treatment at 8° C. with a high-pressure micro-jet homogenizer at a pressure of 100 MPa, and finally freeze-dried at -10° C. to obtain micro-nano cellulose.

[0037] The prepared micronanocellulose such as figure 1 shown by figure 1 It can be seen that the prepared micro-nano fibers have good dispe...

Embodiment 2

[0039] Preparation method of micro-nano cellulose:

[0040] (1) Wood pulp is mixed with the citric acid-sodium citrate buffer solution of pH=6.0 by solid-liquid ratio 1:28g / mL, add the cellulase (the model of Novozymes company is 32IU / g with wood pulp ratio) U cellulase), shaken at 40°C for 18h to obtain a cellulose suspension, filtered and washed, and the filtrate was inactivated at 85°C at high temperature;

[0041] (2) finely refining the cellulose treated in step (1) under a pressure of 1200 Bar to obtain a micron cellulose slurry with a slurry concentration of 20 wt %;

[0042] (3) The micron cellulose slurry was subjected to a high-strength micro-jet homogenization treatment at 4°C with a high-pressure micro-jet homogenizer at a pressure of 90 MPa, and finally freeze-dried at -20°C to obtain micro-nano cellulose.

[0043] The prepared micronanocellulose such as figure 2 shown by figure 2 It can be seen that the prepared micro-nano fibers have good dispersion and un...

Embodiment 3

[0045] Preparation method of micro-nano cellulose:

[0046] (1) Cotton pulp is mixed with the phosphate buffer saline solution of pH=5.0 by solid-liquid ratio 1:35g / mL, adds the cellulase (the acidic fiber of Suhong Cellish L that the Novozymes company model is Suhong Cellish L with the ratio of cotton pulp) Suspension) was shaken at 45°C for 24 hours to obtain a cellulose suspension, filtered and washed, and the filtrate was inactivated at a high temperature of 85°C;

[0047] (2) finely refining the cellulose treated in step (1) under a pressure of 1300 Bar to obtain a micron cellulose slurry with a slurry concentration of 10 wt %;

[0048] (3) The micron cellulose slurry was subjected to a high-strength micro-jet homogenization treatment at 6° C. with a high-pressure micro-jet homogenizer at a pressure of 80 MPa, and finally freeze-dried at -25° C. to obtain micro-nano cellulose.

[0049] The prepared micronanocellulose such as image 3 shown by image 3 It can be seen th...

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Abstract

The invention discloses a preparation method for micro-nano-fibers. The method comprises the steps of (1) mixing a cellulose raw material with a buffer solution, adding a bio-enzyme, shaking to obtain a cellulose suspension liquid, and after filtering and washing, performing high-temperature inactivation on a filter liquor; (2) performing micro-fine pulp grinding on the processed cellulose to obtain a micron cellulose pulp liquid; and (3) performing low-temperature high-intensity micro-jet homogenization processing on the micron cellulose pulp liquid, and performing freeze-drying to obtain micro-nano-cellulose. According to the preparation method, a bio-enzyme pretreatment method is adopted for replacing a conventional acid or alkali treatment method, so that the problem of acid and alkali neutralization treatment in wastewater discharge is reduced; the micro-fine pulp grinding and the high-intensity micro-jet homogenization treatment of the cellulose are adopted, so that the obtained micro-nano-cellulose is uniform in size; and the prepared micro-nano-cellulose is uniform in dispersion and can be applied to products including food additives and military protection articles.

Description

technical field [0001] The invention belongs to the field of plant fiber materials, and in particular relates to a preparation method of micro-nano cellulose. Background technique [0002] Plant cellulose is one of the most abundant natural polymer materials in nature. Due to its renewability and non-polluting properties, it has received more and more attention. After plant cellulose is prepared into micro-nano cellulose, it has the basic structure and properties of plant cellulose, and also has the characteristics of micro-nano cellulose itself, such as large specific surface area, super strong adsorption capacity and high strength. [0003] At present, there are mechanical methods, chemical methods, and biological methods to prepare plant micro-nanocellulose. The document with the patent number 2010102139025 discloses a method for preparing nanocellulose fibers by combining ultrasonic treatment with high-pressure homogeneous treatment. Through ultrasonic treatment, the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/04
CPCC12P19/04C12P19/14
Inventor 陈克复曾劲松王斌李金鹏
Owner SOUTH CHINA UNIV OF TECH
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