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Method for preparing lignocellulosic nanofibrils

A technology of lignocellulose and nanofibrils, which is applied in the direction of pulping with inorganic alkali and pulping with acid/acid anhydride, etc. It can solve the problems of low yield of cellulose fibrils and poor strengthening and toughening effect of cellulose fibers. , achieve high yield, good reinforcement and toughening effect, and improve elastic modulus

Active Publication Date: 2010-04-07
NORTHEAST FORESTRY UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method for preparing lignocellulose nanofibrils in order to solve the problems of poor reinforcement and toughening effect of existing cellulose fibers made from wood and low yield of cellulose fibrils.

Method used

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  • Method for preparing lignocellulosic nanofibrils
  • Method for preparing lignocellulosic nanofibrils
  • Method for preparing lignocellulosic nanofibrils

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specific Embodiment approach 1

[0014] Specific embodiment one: the preparation method of lignocellulose nano-fibril of the present embodiment is carried out according to the following steps: one, wood powder is put into phenylethanol solution and extracts, and extraction temperature is 85~90 ℃, and extraction time is 5-7h, the phenylethanol solution is composed of benzene and ethanol according to the volume ratio of 2:1; 2. Take 1.8-2.2g of the wood powder treated in step 1, 63-67mL of distilled water, and 0.4-0.6mL of glacial acetic acid Mix with 0.5-0.7g of sodium chlorite in a conical flask, then seal the conical flask and heat it in a water bath at 72-77°C for 0.8-1.2h; Add 0.4-0.6mL of glacial acetic acid and 0.5-0.7g of sodium chlorite into the shaped bottle and mix evenly, heat treatment in a water bath at 72-77°C for 0.8-1.2h; 4. Repeat step 3 for 3-5 times Remove lignin; 5. Add 35 to 37 mL of KOH solution with a mass concentration of 1.5% to 2.5% to the material treated in step 4, mix evenly, and k...

specific Embodiment approach 2

[0015] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the wood powder is poplar wood powder with a particle size of 50-70 mesh, fir powder with a particle size of 50-70 mesh or 50-70 mesh particle size Pine flour. Other steps and parameters are the same as those in Embodiment 1.

[0016] When the wood flour in this embodiment is a mixture, various wood flours can be mixed in any ratio.

specific Embodiment approach 3

[0017] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the extraction temperature in step 1 is 90° C., and the extraction time is 6 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for preparing lignocellulosic nanofibrils, which relates to a method for preparing nanofibrils. The method solves the problems that the traditional cellulose fiber manufactured by taking timber as a raw material has poor strengthening and toughening effects and cellulose fibrils obtained through the preparation have low yield. The method comprises the steps of: 1, extracting wood meal; 2, mixing raw materials and performing heating treatment on the mixture; 3, then adding glacial acetic acid and sodium chlorite into the mixture, and performing heating treatment after the mixing; 4, removing lignin; 5, removing hemicellulose; 6, re-removing the lignin; 7 re-removing the hemicellulose; and 8, performing ultrasonic crushing treatment to obtain the lignocellulosic nanofibrils. The yield of the manufacturing method is between 80 and 90 percent and is high; and the lignocellulosic nanofibrils prepared by the method have good strengthening and toughening effects.

Description

technical field [0001] The invention relates to a preparation method of nano fibrils. Background technique [0002] Due to the advantages of high Young's modulus, high strength, ultrafine structure, high specific surface area, biodegradability, and abundant raw materials, nanocellulose has great potential in the fields of polymer nanocomposites, medical drug sustained-release materials, and filter materials. Great application prospects. Cellulose nanofibrils are a kind of nanocellulose. In addition to the above-mentioned advantages, they also have a very high aspect ratio, and can be interwoven and entangled into a network-like toughening structure, which can significantly increase the strength of the polymer. It can also impart higher toughness to the polymer. [0003] A large amount of low-quality and inferior wood and wood processing residues are produced in our country every year, but this part of resources has not been used very scientifically. Because there are a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/04
Inventor 陈文帅于海鹏刘一星陈鹏
Owner NORTHEAST FORESTRY UNIVERSITY
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