Method for preparing nanometer cellulose fiber through combining ultrasound and high-pressure homogenization treatment

A technology of nanocellulose and high-pressure homogenization, which is applied in the field of preparation of nanocellulose fibers, can solve the problems of easy interweaving and clustering between fibers, uneven fiber diameter distribution, and low length of nanocellulose fibers, so as to improve tensile strength. The effect of strength, good biocompatibility

Inactive Publication Date: 2010-10-06
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0004] The present invention aims to solve the existing problems of low length, uneven distribution of fiber diameters and easy interweaving of fibers into clusters of micron-scale fibers in nanocellulose fibers prepared by mechanical high-pressure homogeneous treatment method, and provides an ultrasonic Method for preparing nanocellulose fibers by combining high-pressure homogeneous treatment

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  • Method for preparing nanometer cellulose fiber through combining ultrasound and high-pressure homogenization treatment
  • Method for preparing nanometer cellulose fiber through combining ultrasound and high-pressure homogenization treatment
  • Method for preparing nanometer cellulose fiber through combining ultrasound and high-pressure homogenization treatment

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specific Embodiment approach 1

[0011] Specific implementation method 1: A method for preparing nanocellulose fibers by ultrasonic combined with high-pressure homogeneous treatment in this embodiment is carried out according to the following steps: 1. The mass ratio of biomass fiber and benzyl alcohol solution is 1:50-100. Biomass fiber and benzyl alcohol solution, and place the biomass fiber in the benzyl alcohol solution, and extract at a temperature of 85°C to 95°C for 5h to 7h; 2. The preparation concentration is 1% to 2% (mass) sodium chlorite solution, and adjust its pH value to 4-5 with glacial acetic acid, then add the biomass fiber treated in step 1 into the sodium chlorite solution for 4h-6h, and continue every 0.9-1.1h during this period Add sodium chlorite and glacial acetic acid to the sodium chlorite solution to keep the concentration of sodium chlorite in the sodium chlorite solution at 1% to 2% (mass), and the pH of the sodium chlorite solution to be 4~5; 3. Add the biomass fiber treated in s...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the biomass fiber described in step 1 is 50-70 mesh wood fiber, 50-70 mesh bamboo fiber, 50-70 mesh hemp fiber , 50-70 mesh pulp fiber, 50-70 mesh crop straw fiber or microcrystalline cellulose fiber. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the biomass fiber described in step one is 60 mesh wood fiber, 60 mesh bamboo fiber, 60 mesh hemp fiber, 60 mesh pulp fiber, 60 mesh fiber The target crop straw fiber or microcrystalline cellulose fiber. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for preparing nanometer cellulose fiber through combining ultrasound and high-pressure homogenization treatment, which relates to a preparation method of nanometer cellulose fiber. The invention solves the problems of short length, nonuniform fiber diameter distribution and easy interweaving between fiber into cluster nanometer fiber of the nanometer cellulose fiber prepared by the existing method only using mechanical high-pressure homogenization treatment. The method of the invention comprises the following steps that: 1. biomass fiber is extracted by an alcohol benzene solution; 2. the treatment by acidified sodium chlorite is carried out; 3. alkali liquor gradient treatment is carried out; 4. an ultrasonic cell crushing machine is used for treatment; and 5. high-pressure homogenization treatment is carried out, and nanometer cellulose fiber is obtained after being dried. The fiber diameter distribution is uniform, the length is longer than or equal to 150 mum, the slenderness ratio is larger than or equal to 600, and the fiber is mutually interwoven into a reticular winding structure. The method of the invention is applicable to the preparation of nanometer cellulose fiber from wood pulp, papermaking pulp materials, wood materials, bamboo materials and crop straws.

Description

technical field [0001] The invention relates to a method for preparing nanocellulose fibers. Background technique [0002] With the continuous penetration and development of nanotechnology in the field of cellulose science, the processing of biomass cellulose resources into nanoscale fiber products has attracted increasing attention. According to its own structural characteristics, nanocellulose mainly includes rod-shaped nano-microcrystalline cellulose, granular or needle-shaped cellulose nano-whiskers, and long-length filamentous nano-cellulose fibers. The filamentous nanocellulose fibers have a high aspect ratio and network entanglement structure, which not only enhances the strength of the polymer, but also significantly improves the toughness of the polymer. The research on preparation and properties has become a research hotspot in the field of cellulose science in recent years. [0003] The existing method of preparing nanocellulose fibers by mechanical high-pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/02
Inventor 陈文帅于海鹏刘一星陈鹏
Owner NORTHEAST FORESTRY UNIVERSITY
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