Preparation method of homogenized fine nano-cellulose fiber

A nanocellulose and homogenization technology, applied in the field of nanocellulose fiber preparation, can solve the problems of uneven distribution of biomass nanocellulose diameter, narrow application range of TEMPO catalytic oxidation method, easy aggregation of nanofibers, etc., to achieve The effect of uniform diameter size distribution and uniform dispersion

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

[0004] In order to solve the problems of uneven diameter distribution of biomass nanocellulose prepared by the existing strong acid hydrolysis method and high-strength mechanical shearing method, ea

Method used

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  • Preparation method of homogenized fine nano-cellulose fiber

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specific Embodiment approach 1

[0016] Specific implementation mode 1: The preparation method of the homogenized fine nano-cellulose fiber in this embodiment 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 to 100. Alcohol solution, and the biomass fiber was added to the benzyl alcohol solution, and extracted at a temperature of 85°C to 95°C for 5h to 7h; 2. Prepare sodium chlorite with a concentration of 1% to 2% (mass) 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, during which the sodium chlorite solution is added every 0.9-1.1h Add sodium chlorite and glacial acetic acid in the middle, be 1%~2% (quality), pH value to be 4~5 to keep the concentration of sodium chlorite in the sodium chlorite solution; Biomass fiber is added to the alkali solution with a concentration of 1% to 3% (mass), mixed evenly, and ke...

specific Embodiment approach 2

[0019] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the biomass fiber in step 1 is wood flour with a particle size of 50-70 mesh, bamboo powder with 50-70 mesh, and crop straw fiber with 50-70 mesh. 50-70 mesh hemp fiber, 50-70 mesh cotton fiber, 50-70 mesh pulp fiber or 50-70 mesh microcrystalline cellulose fiber. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the drying method described in step seven is freeze drying, supercritical drying or critical point drying; wherein the step of freeze drying is: suspending the nanofiber The turbid liquid is frozen at -5°C~-20°C for 20h~24h, and then placed in a freeze dryer for freeze drying. The temperature of the cold trap of the freeze dryer is -55°C~-60°C. The vacuum degree is 15Pa~1Pa, and the freezing time is 20h~24h; supercritical drying method or critical point drying method is the existing conventional technology. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a preparation method of a homogenized fine nano-cellulose fiber. The preparation method can solve the problems of uniform diameter distributor of biomass nano-cellulose prepared by the existing strong acid hydrolysis method and the high-strength mechanical shearing method, easy gathering among the nano-fiber and a narrow range of applications of the TEMPO catalytic oxidation method. The preparation method comprises the following steps: 1) extracting biomass fiber with benzyl alcohol solution; 2) carrying out treatment by using acidified sodium chlorite; 3) carrying out gradient treatment with alkaline liquor; 4) using TEMPO, sodium bromide and sodium hypochlorite for catalytic oxidation treatment; 5) using sodium chlorite for treatment; and 6) carrying out nano-scale processing by using the long-term stirring method, the ultrasonic method or the high-pressure homogenization method, drying, and then obtaining the homogenized fine nano-cellulose fiber. The fiber has the uniform diameter distribution, the diameter is 3-5nm, the length-diameter ratio is not less than 500, the fiber is mutually interwoven into a mesh snarling structure, and the method is applicable to preparing the nano-cellulose fiber by using wood pulp, paper-making pulp, wood, bamboo and crop straw.

Description

technical field [0001] The invention relates to a method for preparing nanocellulose fibers. Background technique [0002] Nanocellulose is a nano-material with a diameter of 1-100nm and a granular, rod-like or filamentary structure isolated from natural fibers. Due to its advantages of regeneration, low density, high strength, high elastic modulus, high specific surface area, low cost, biodegradability, and nanoscale fine scale, it is widely used in reinforced polymer nanocomposites, flexible display substrate materials, artificial There is a large potential application space in the field of advanced functional materials such as skin, artificial blood vessels, and biosensors. [0003] Biomass nanocellulose prepared by the existing strong acid hydrolysis method and high-strength mechanical shearing method has a large number of hydroxyl groups on the surface of the nanoscale cellulose fibers, and there is a large hydrogen bond force between the hydroxyl groups, making the na...

Claims

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Application Information

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IPC IPC(8): C08B15/04D01F2/02
Inventor 于海鹏陈文帅陈鹏刘一星海云飞张明鑫
Owner NORTHEAST FORESTRY UNIVERSITY
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