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A kind of preparation method of wood nanofiber

A nanofiber and wood fiber technology, which is applied to artificial filaments made of cellulose derivatives, pulping with organic solvents, pulping with acid salts/acid anhydrides, etc., can solve the problem of low catalytic activity of TEMPO and easy generation of nanofibers. Agglomeration, uneven distribution of wood nanofibers diameter, etc., to achieve the effect of low degree of mutual aggregation, good separation treatment, and improved catalytic activity

Active Publication Date: 2018-10-26
HIDETAKA NANO TECH CO LTD
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Problems solved by technology

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a method for preparing wood nanofibers, which further solves the problems of uneven diameter distribution of wood nanofibers prepared by the prior art, easy aggregation between nanofibers, and low catalytic activity of TEMPO

Method used

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Embodiment Construction

[0029] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] refer to figure 1 , a preferred embodiment of the present invention provides a method for preparing wood nanofibers, comprising the steps of:

[0031] S1. Using a mixture of sulfurous acid and acidic sulfite as a cooking agent to cook wood fibers to obtain pulp;

[0032]S2. Weigh the pulp and the benzene alcohol solution according to the mass ratio of the pulp and the benzene alcohol solution at a ratio of 1:80, mix the two under agitation, and extract at a temperature of 90°C for 8 hours to obtain the extracted wood fiber;

[0033] S3. prepare the sodium chlorite solution that mass concentration is 1.5%, and adjust its pH value to 4~5 with glacial acetic acid, add some polyethylene friction blocks in the sodium chlorite solution, the volume of the added polyethylene friction blocks accounts for 1 / 3rd of the volume of sodium chlorit...

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Abstract

The invention provides a preparation method of wood nanofiber, comprising the following steps: 1, boiling wood fiber to prepare paper pulp; 2, extracting wood fiber; 3, processing with a sodium chlorite solution and with the assistance of polyethylene friction block; 4, processing with aqueous alkali to obtain purified cellulose; 5, preparing PS / Fe3O4 / SiO2 composite nanoparticles; 6, carrying out catalytic oxidation in the catalytic system of TEMPO, composite nanoparticles, sodium bromide and sodium hypochlorite; 7, carrying out a reaction by microwave heating of cellulose suspension under the condition of an alternating magnetic field, washing and vacuum-drying the reaction product so as to obtain oven dry oxidized cellulose fiber; and 8, freeze-drying suspension so as to obtain nanometer cellulosic fiber with high carboxyl group content. The prepared uniform fine wood nanofiber is uniformly dispersed; aggregation extent of nanofiber is low; and the fiber surface contains carboxyl group which is beneficial to chemical modification of nanofiber so as to prepare high-performance functional products.

Description

technical field [0001] The invention relates to the technical field of wood fiber preparation, in particular to a method for preparing wood nanofibers. 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] Carbon fiber with a wide range of applications has high axial strength and modulus, low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environments, good fatigue resistance, specific h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F2/24C08B15/04D21C3/06D21C3/20
CPCC08B15/04D01F2/24D21C3/06D21C3/20
Inventor 崔建中
Owner HIDETAKA NANO TECH CO LTD
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