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Method for preparing cellulose nanocrystalline sponge material

A cellulose and nanocrystal technology, applied in the field of preparation of cellulose nanocrystals, can solve the problems of inconvenient storage and use, inability to reuse, weak enhancement effect, etc., and achieves cost recovery, simple and easy experimental operation, and shape recovery. good effect

Inactive Publication Date: 2017-05-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the commonly used CNC is generally rod-shaped or spherical, with a relatively low length and diameter, the CNC has a weak reinforcement effect, and the material itself is easily deformed and damaged.
In addition, the sample is in powder form, which is extremely inconvenient to store and use, and can hardly be reused

Method used

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  • Method for preparing cellulose nanocrystalline sponge material
  • Method for preparing cellulose nanocrystalline sponge material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After cleaning and shredding the waste ginger fiber, mix it with a mixed acid solution formed by mixing formic acid with a concentration of 6mol / L and hydrochloric acid with a concentration of 6mol / L at a solid-liquid ratio of 1:100g / mL, wherein the volume ratio of formic acid and hydrochloric acid 5:5, put it in a hydrothermal kettle, react in an oven at 110°C for 3 hours, add ammonia water dropwise after the reaction to adjust the pH value to 7, centrifuge and wash 3 times, and freeze-dry it in a plastic mold at -50°C for 12 hours. The spongy cellulose nanocrystalline material (a) is obtained. Observing under a scanning electron microscope, the length of the cellulose nanorod is 500-1000nm, the diameter is 5-40nm, and the aspect ratio is 25-200.

Embodiment 2

[0024] After cleaning and shredding the waste cotton fiber, mix it with a mixed acid solution formed by mixing citric acid with a concentration of 3mol / L and hydrochloric acid with a concentration of 6mol / L at a solid-liquid ratio of 1:75g / mL, wherein the citric acid and hydrochloric acid The volume ratio is 7:3, put it into a hydrothermal kettle, and react in an oven at 120°C for 4 hours. After the reaction, add ammonia water dropwise to adjust the pH value to 7, centrifuge and wash 4 times, and put it in a plastic mold at -50°C to freeze dry After 24 hours, the spongy cellulose nanocrystalline material (b) was obtained. The obtained cellulose nanorods have a length of 600-1200nm, a diameter of 5-50nm and an aspect ratio of 25-240 observed under a scanning electron microscope.

Embodiment 3

[0026] Coconut fiber is washed and shredded and mixed with the mixed acid solution formed by mixing the formic acid of 6mol / L and the hydrochloric acid of 6mol / L by the solid-liquid ratio, wherein the volume ratio of formic acid and hydrochloric acid is 9:1, put it into a hydrothermal kettle, react in an oven at 130°C for 5 hours, add ammonia water dropwise after the reaction to adjust the pH value to 7, centrifuge and wash 3 times, put it in a plastic mold at -50°C and freeze-dry for 48 hours to obtain Sponge-like cellulose nanocrystalline material (c). Observing under a scanning electron microscope, the length of the cellulose nanorod is 500-1500nm, the diameter is 5-40nm, and the aspect ratio is 25-300.

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Abstract

The invention relates to a method for preparing a cellulose nanocrystalline sponge material. The method comprises the following steps: 1) mixing pretreated biomass cellulose with mixed acid, performing a reaction for 2-10 hours at 50-130 DEG C, after the reaction is completed, performing water washing and centrifugal treatment, and adjusting the pH value of the mixed liquid to be 7 so as to obtain a cellulose nanocrystalline suspension; and 2) pouring the obtained cellulose nanocrystalline suspension into plastic molds of different shapes, and performing freeze-drying, thereby obtaining the cellulose nanocrystalline sponge material of a designed shape. The material is simple and feasible and rapid and efficient in preparation process, is extracted from biomass cellulose, is capable of turning waste into wealth, is green, environmental-friendly and reproducible, and can be degraded in a multifunctional complete biological manner. The obtained cellulose nanocrystalline has the characteristics of an ultra-high length-diameter ratio, a shape of a long nanowire, molecular chain windable self-assembling molding, massive nanocrystalline surface modification groups, an efficient netting effect and the like.

Description

technical field [0001] The invention belongs to the field of preparation of cellulose nanocrystals, in particular to a preparation method of a cellulose nanocrystal sponge material. Background technique [0002] In today's world facing the shortage of petrofossil energy and environmental degradation, people are paying more attention to the research of renewable materials or energy. Composites from renewable biomass feedstocks are expected to be the most promising alternatives to petrochemical-based polymers. Cellulose is the most abundant and biodegradable natural polymer compound in nature, and the development of renewable cellulose resources will become a trend. On the other hand, a large amount of various natural biomass is abandoned and burned every year, causing terrible environmental pollution and waste of resources. Use acid to hydrolyze cellulose under certain conditions. When cellulose acid is hydrolyzed to nanometer size, the particle size distribution is between...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L1/04C08B15/02
CPCC08B15/02C08J9/28C08L1/04C08J2301/04
Inventor 余厚咏王端超张恒周雨薇宋美丽
Owner ZHEJIANG SCI-TECH UNIV
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