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A kind of method to improve the mechanical strength of cellulose aerogel

A technology of cellulose airgel and mechanical strength, which is applied in the field of improving the mechanical properties of cellulose aerogel, can solve the problems of low mechanical strength of cellulose aerogel, and achieve cost-friendly, green, high safety, uniform three-dimensional The effect of network structure

Inactive Publication Date: 2018-10-12
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of low mechanical strength of existing cellulose airgel, and provides a method for improving the mechanical strength of cellulose aerogel

Method used

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  • A kind of method to improve the mechanical strength of cellulose aerogel
  • A kind of method to improve the mechanical strength of cellulose aerogel
  • A kind of method to improve the mechanical strength of cellulose aerogel

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specific Embodiment approach 1

[0023] Embodiment 1: A method for improving the mechanical strength of cellulose aerogel described in this embodiment is carried out according to the following steps:

[0024] 1. Add NaOH and polyethylene glycol into water at a temperature of 1°C to 40°C, and stir for 0.1h to 100h to obtain a mixed solvent;

[0025] The mass ratio of NaOH to polyethylene glycol is 1:(0.01~1); the mass ratio of NaOH to water is (0.01~0.5):1;

[0026] 2. Add cellulose to the mixed solvent at a temperature of 1°C to 40°C, and stir for 5h to 100h to obtain a uniform cellulose solution;

[0027] The mass ratio of the cellulose to the mixed solvent is 1:(10~1000);

[0028] 3. Place the uniform cellulose solution at a temperature of 50°C to 200°C, heat it for 1h to 100h, then place it at a temperature of -100°C to -10°C, and freeze it for 1h to 100h to obtain frozen Cellulose solution;

[0029] 4. Immerse the frozen cellulose solution in an acid solution with a mass percentage of 0.1% to 30%, and ...

specific Embodiment approach 2

[0035] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the molecular weight of polyethylene glycol described in step 1 is 200-40,000. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the water described in step 1 is distilled water, deionized water or ultrapure water. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for improving mechanical properties of cellulose aerogel, in particular to a method for improving the mechanical strength of the cellulose aerogel, and aims to solve the problem that the conventional cellulose aerogel is low in mechanical strength. The method comprises the following steps: 1, preparing a mixed solvent; 2, preparing a homogeneous cellulose solution; 3, heating and freezing the cellulose solution; 4, dipping the cellulose solution into an acid solution to obtain cellulose hydrogel; and 5, drying the cellulose hydrogel to obtain the high-strength cellulose aerogel. The method provided by the invention is used for improving the mechanical strength of the cellulose aerogel.

Description

technical field [0001] The present invention relates to a method for improving the mechanical properties of cellulose aerogels. Background technique [0002] With the depletion of petrochemical resources and the intensification of environmental pollution, people's enthusiasm for research on renewable, degradable and recyclable natural resources (such as cellulose, chitin) is gradually heating up; at the same time, the development of green natural resources as raw materials It has become one of the research hotspots to replace the petrochemical products that exist in large quantities in the market with high-performance products. As the most abundant organic polymer in nature, cellulose has excellent properties such as good biocompatibility and active chemical reactivity. Airgel is a special gel that replaces the liquid in the gel with gas without substantially changing the network structure of the gel itself. It is the product of hydrogel or organogel after drying. Airgel h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/075C08L1/02
CPCC08J3/075C08J9/28C08J2201/0504C08J2301/02
Inventor 李坚万才超焦月
Owner NORTHEAST FORESTRY UNIVERSITY