Plant-based cellulose nanofibril as well as preparation method and application thereof

A nanofibril and cellulose technology, which is applied in the post-processing of cellulose pulp, fiber raw material processing, pulp beating method, etc., can solve the problems of staying in the laboratory research stage, less large-scale production, and large energy consumption. The effect of promoting dissociation and miniaturization, promoting fibrillation, and improving efficiency

Active Publication Date: 2022-02-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For plant-based cellulose nanofibrils, the existing mature processes mainly focus on TEMPO media oxidation system or high-pressure homogenization, etc. Although certain products can be obtained, there are serious pollution or large energy consumption problems
There are many related studies on the preparation of cellulose nanofibrils, but most of them only stay in the laboratory research stage, and few of them can truly realize large-scale production.

Method used

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  • Plant-based cellulose nanofibril as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing plant-based cellulose nanofibrils of the present embodiment, the specific preparation steps are as follows:

[0039] (1) Ball milling treatment: the bleaching chemical thermomechanical slurry is configured into a mixed solution with a concentration of 1.0% (w / w), and 160 g of the mixed slurry quality is poured into a 500 mL ball milling tank, and a large ball (diameter: 10 mm ) and small balls (diameter: 6mm), wherein the mass ratio of large balls to small balls is 3:2. And control the mass ratio of mixing balls and slurry dry to 30:1. During the ball milling process, the rotating speed of the ball mill was set to 400rpm. In order to avoid overheating of the slurry, the ball milling was set for 5 minutes, and the suspension was 5 minutes as a cycle. The ball milling time was 0.5h to obtain the ball milled slurry.

[0040] (2) High-speed shearing treatment: the slurry after the ball milling treatment obtained in step (1) is configured into a suspe...

Embodiment 2

[0044] A method for preparing plant-based cellulose nanofibrils of the present embodiment, the specific preparation steps are as follows:

[0045] (1) Ball milling treatment: the bleaching chemical thermomechanical slurry is configured into a mixed solution with a concentration of 1.5% (w / w), and 180 g of the mixed slurry quality is poured into a 500 mL ball milling tank, and a large ball (diameter: 10 mm ) and small balls (diameter: 6mm), wherein the mass ratio of large balls to small balls is 4:2. And control the mass ratio of mixing balls and slurry dry to 35:1. During the ball milling process, the rotating speed of the ball mill was set to 400rpm. In order to avoid overheating of the slurry, the ball milling was set for 7 minutes, and a cycle of 7 minutes was suspended. The ball milling time was 1 hour to obtain the ball milled slurry.

[0046] (2) High-speed shearing treatment: the slurry after the ball milling treatment obtained in step (1) is configured into a suspensi...

Embodiment 3

[0050] A method for preparing plant-based cellulose nanofibrils of the present embodiment, the specific preparation steps are as follows:

[0051] (1) Ball milling treatment: the bleaching chemical thermomechanical slurry is configured into a mixed solution with a concentration of 2.0% (w / w), and 200 g of the mixed slurry quality is poured into a 500 mL ball milling tank, and a large ball (diameter: 10 mm ) and small balls (diameter: 6mm), wherein the mass ratio of large balls to small balls is 5:2. And control the mass ratio of mixing balls and slurry dry to 35:1. During the ball milling process, the rotating speed of the ball mill was set at 500rpm. In order to avoid overheating of the slurry, the ball milling was set for 8 minutes, and a cycle of pausing for 8 minutes was used. The ball milling time was 1.5 hours to obtain the ball milled slurry.

[0052] (2) High-speed shearing treatment: the slurry after the ball milling treatment obtained in step (1) is configured into ...

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Abstract

The invention discloses a plant-based cellulose nanofibril as well as a preparation method and application thereof, belonging to the technical field of nanocellulose preparation. The method comprises the steps of ball milling treatment, high-speed shearing treatment and low-intensity ultrasonic treatment. According to the invention, plant-based fiber slurry is pretreated by ball milling, so the surface roughness of fibers is increased, fibrillation is enhanced, and dissociation and micronization of the fibers are promoted; low-intensity ultrasonic dispersion treatment is adopted, so a green and mild ultrasonic environment is created, and the crystallinity of the plant-based cellulose nanofibril can be improved; and a physical preparation method combining ball milling treatment, high-speed shearing treatment and low-intensity ultrasonic treatment is adopted, chemical reagents harmful to the environment are not used in the whole process, and a process is simple and easy to operate, so an economical and green method is provided for large-scale production of the plant-based cellulose nanofibril. Therefore, the method is of great significance to green preparation of the plant-based cellulose nanofibril.

Description

technical field [0001] The invention belongs to the technical field of nanocellulose preparation, and in particular relates to a plant-based cellulose nanofibril and a preparation method and application thereof. Background technique [0002] Cellulose is a natural renewable organic polymer that widely exists in nature, and it widely exists in plants and some protozoan substrates. With the advantages of wide sources, abundant reserves, biodegradability and good biocompatibility, it is considered as an energy and raw material to meet the sustainable development of human society in the future. Nanocellulose generally refers to cellulose with at least one dimension in the nanometer range (1-100nm) in cellulose materials. It has the characteristics of low toxicity, low density, good mechanical properties, and easy functional modification. Therefore, nanocellulose has great application prospects in the fields of biomedicine, functional composite membranes, cosmetics, and textiles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21D1/28D21D1/02D21C9/00D21C5/00
CPCD21D1/28D21D1/02D21C9/007D21C5/00
Inventor 程峥曾劲松王斌陈克复李金鹏胡复港
Owner SOUTH CHINA UNIV OF TECH
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