Preparation method of biomass cellulose nanofibers with high length-diameter ratio

A biomass fiber and nanofiber technology is applied in the field of preparation of nanocellulose fibers, which can solve the problems of easy mutual aggregation of nanocellulose fibers, high cost of microbial fermentation, small aspect ratio, etc., and achieves low cost and is conducive to application. , the effect of high crystallinity

Inactive Publication Date: 2010-10-20
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0004] In order to solve the problems of low length and small aspect ratio of nanocellulose fibers prepared by strong acid hydrolysis of biomass cellulose, easy mutual aggregation of nanocellulose fibers prepared by mechanical shearing method and high cost of microbial fermentation method, the present invention provides Preparation method of high aspect ratio biomass cellulose nanofibers

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  • Preparation method of biomass cellulose nanofibers with high length-diameter ratio
  • Preparation method of biomass cellulose nanofibers with high length-diameter ratio
  • Preparation method of biomass cellulose nanofibers with high length-diameter ratio

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specific Embodiment approach 1

[0012] Specific embodiment 1: The preparation method of the high aspect ratio biomass cellulose nanofiber of the present invention is carried out according to the following steps: 1. Weigh the biomass fiber and benzene alcohol solution according to the mass ratio of 1:50-100, And put the biomass fiber in the benzyl alcohol solution, and extract it for 5h-7h at a temperature of 85°C-95°C; 2. Prepare a sodium chlorite solution with a concentration of 1%-2% (mass), and Adjust its pH value to 4-5, then add the biomass fiber treated in step 1 into the sodium chlorite solution for 4h-6h, and continue to add nitrite to the sodium chlorite solution every 0.9-1.1h during this period. Sodium chlorate and glacial acetic acid are 1%~2% (quality) to keep the concentration of sodium chlorite in the sodium chlorite solution, and the pH value of the sodium chlorite solution is 4~5; Three, will pass through step two The treated biomass fiber is added to the KOH solution with a concentration of...

specific Embodiment approach 2

[0014] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the biomass fibers described in step 1 are wood fibers of 50 mesh to 70 mesh, bamboo fibers of 50 mesh to 70 mesh, and cotton fibers of 50 mesh to 70 mesh , 50-70 mesh hemp fiber or 50-70 mesh crop straw fiber. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the biomass fiber described in step one is 60 mesh wood fiber, 60 mesh bamboo fiber, 60 mesh cotton fiber, 60 mesh hemp fiber or 60 mesh fiber. Purpose Crop straw fiber. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of biomass cellulose nanofibers with a high length-diameter ratio, in particular to a preparation method of nano cellulose fibers, solving the problems that nano cellulose fibers prepared by using a traditional method for hydrolyzing biomass cellulose with strong acid have short length and small length-diameter ratio, nano cellulose fibers prepared by using a mechanical shearing method are easy to mutually aggregate, and a microbial fermentation method has high cost. The method comprises the following steps of: (1) purifying biomass cellulose with a benzyl alcohol solution; (2); treating with acidified sodium chlorite; (3) treating lye; (4) treating with the acidified sodium chlorite again; (5) treating with KOH; (6) treating with hydrochloric acid; and (7) ultrasonically treating and drying to obtain biomass cellulose nanofibers with high length-diameter ratio not less than 1500, fiber diameter from 50 nm to 300 nm, length not less than 150 um and length-diameter ratio not less than 1500. The biomass cellulose nanofibers are mutually interwoven into a tightly wound mesh structure. The invention has low cost and is suitable for preparing nano cellulose fibers from wood, bamboo, cotton, linen and crop straw.

Description

technical field [0001] The invention relates to a preparation method of nano cellulose fibers. Background technique [0002] Cellulose is a natural organic polymer material with extremely abundant reserves in nature, and it is widely present in the cell walls of biomass materials such as wood, bamboo, wheat straw fiber, and hemp. With the rise of nanotechnology in the development and utilization of cellulose resources, nanocellulose has been extracted from different biomass materials and used to prepare functional products such as polymer-reinforced nanocomposites, tissue engineering materials, and drug sustained-release materials. It has gradually become a research hotspot in the field of cellulose science. [0003] Traditional nanocellulose preparation methods mainly include strong acid hydrolysis, high-intensity mechanical shearing treatment and microbial fermentation to prepare bacterial cellulose. By using strong acid to hydrolyze the biomass cellulose, the amorphous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/00
Inventor 于海鹏陈文帅刘一星陈鹏张明鑫海云飞
Owner NORTHEAST FORESTRY UNIVERSITY
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