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Preparation method of lignocellulose nanofibers

A technology of lignocellulose and nanofibers, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of harsh preparation process conditions, poor interface compatibility, and poor product quality, and achieve uniform particle size distribution, interfacial phase Good capacity and improved dispersion stability

Active Publication Date: 2019-08-16
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: The purpose of the invention is to provide a method for preparing lignocellulose nanofibers that solves the problems of harsh preparation process conditions, high toxicity, poor product quality, and poor interfacial compatibility when composited with a polymer matrix.

Method used

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  • Preparation method of lignocellulose nanofibers
  • Preparation method of lignocellulose nanofibers
  • Preparation method of lignocellulose nanofibers

Examples

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Embodiment 1

[0022] Mix the hydrogen bond acceptor choline chloride with the hydrogen bond donor lactic acid at a molar ratio of 1:9, and stir mechanically at room temperature until a uniform and stable deep eutectic solvent is obtained; take bleached hardwood pulp as the lignocellulose raw material and pass it through a deflagging machine Dissolved into cotton wool, mixed uniformly with the deep eutectic solvent at a mass ratio of 1:8, and heat-treated at 85°C for 3h; the mixture of lignocellulose and deep eutectic solvent after the swelling reaction was completed was added to the colloid mill for grinding for 40min, Obtain the deep eutectic solvent dispersion liquid of surface esterified lignocellulose nanofiber; Dispersion liquid is obtained the lignocellulose nanofiber of surface esterification (as figure 1 Shown in A), the length of the lignocellulose nanofibers is 7-12um, the width is 60-100nm, and the yield of the prepared lignocellulose nanofibers is 80-90%.

[0023] The above-ment...

Embodiment 2

[0025] The preparation of lignocellulose nanofibers, the method is the same as in Example 1, wherein, in Example 1, the hydrogen bond acceptor choline chloride in the deep eutectic solvent adopts any one of choline bromide, choline iodide or betaine substitute.

Embodiment 3

[0027] The preparation of lignocellulose nanofibers, the method is the same as in Example 1, wherein, in Example 1, the hydrogen bond donor lactic acid in the deep eutectic solvent adopts citric acid, maleic acid, oxalic acid, malonic acid, formic acid , malic acid, acetic acid any alternative.

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Abstract

The invention discloses a preparation method of lignocellulose nanofibers. The method comprises the following steps: (1) mixing a hydrogen bond acceptor with a hydrogen bond donor to prepare a deep eutectic solvent; (2) mixing a defibered lignocellulose raw material with the deep eutectic solvent obtained in step (1), and carrying out heat treatment to obtain a swelled, defibered and surface-esterified lignocellulose mixture; (3) mechanically treating the mixture obtained in step (2) to obtain a surface-esterified lignocellulose nanofiber dispersion; and (4) carrying out suction filtration onthe dispersion obtained in step (3), and washing, separating and drying the obtained solid to obtain the lignocellulose nanofibers. The product prepared by the method has the advantages of high length-to-diameter ratio, uniform particle size distribution, obviously improved dispersion stability, obviously improved redispersibility, and good interface compatibility with a polymer matrix. The preparation method has the advantages of mild process conditions, low toxicity, and easiness in operation.

Description

technical field [0001] The invention relates to a method for preparing natural polymer nanofibers, in particular to a method for preparing lignocellulose nanofibers. Background technique [0002] Lignocellulosic raw materials mainly include wood, bamboo, grass, hemp and cotton, etc., which are one of the abundant renewable resources on the earth. Lignocellulose is widely used in textiles, papermaking, medicine, environmental protection, building materials and petrochemical industries. The preparation of biomass nanomaterials by using lignocellulose as raw material through dissolution, separation, regeneration, dispersion and other processes has become a research hotspot in recent years. Since natural wood, bamboo and grass only contain about 50% cellulose, artificial separation of cellulose is not only complicated and costly, it is difficult to achieve high value-added industrial applications, so looking for lignocellulosic raw materials that can be directly obtained from l...

Claims

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Application Information

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IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 王志国刘苏玲俞娟刘亮范一民
Owner NANJING FORESTRY UNIV
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