Preparation method of cellulose compound aerogel

A composite airgel and cellulose technology, applied in the field of natural polymer material synthesis, can solve the problems of small specific surface area and poor toughness

Inactive Publication Date: 2017-09-08
林向阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As one of the abundant natural polymer biomass materials in nature, cellulose has good biocompatibility, renewability and biodegradability, which has attracted widespread attention. Cellulose-based airgel is A three-dimensional network is a highly porous material formed by removing the liquid solvent in it. At present, cellulose-based airgel has gradually entered all aspects of people's lives, and is widely used in cosmetics, catalysis, organ transplantation, adsorption, However, pure cellulose airgel has the disadvantages of poor toughness and small specific surface area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of cellulose composite airgel, the steps are as follows:

[0025] Step 1. Pretreatment of durian shells: Cut the collected discarded durian shells evenly into small pieces, then clean the dirt on the surface, and vacuum dry them at 45°C for 24h~36h. Pulverize, sieve, and screen out the shell powder with a particle size of 100 to 200 meshes for use;

[0026] Step 2. Preparation of carboxylated nanocellulose: Take a certain amount of shell powder in step 1, soak it in ammonium persulfate solution for 24 hours, add a certain amount of distilled water to the suspension to dilute, and then rotate at a speed of 12000r.min -1 Centrifuge in a centrifuge, centrifuge to neutral at 8000 r.min -1 Collect the colloid in the upper layer at a rotating speed, put the obtained colloid into a freeze-drying box, and carry out vacuum freeze-drying at -20°C~-10°C for 12h~48h to obtain powdery carboxylated nanocellulose for use;

[0027] Step 3, preparation of cellulos...

Embodiment 2

[0041] A preparation method of cellulose composite airgel, the steps are as follows:

[0042] Step 1. Pretreatment of durian shells: Cut the collected discarded durian shells evenly into small pieces, then clean the dirt on the surface, vacuum dry at 50°C for 30 hours, and pulverize them in a pulverizer , sieved, and the particle size is 100 ~ 200 mesh shell powder, stand-by;

[0043] Step 2. Preparation of carboxylated nanocellulose: take a certain amount of shell powder in step 1, soak it in ammonium persulfate solution for 24 hours, and perform three stages of heating and ultrasonic stirring. The first stage: at a temperature of 80 ° C, ultrasonic Ultrasound for 2h under the condition of power of 750w, the second stage: ultrasonic for 2h under the condition of temperature of 70°C and ultrasonic power of 750w, the third stage: ultrasonic for 2h under the condition of temperature of 60°C and ultrasonic power of 250w, to obtain Suspension, heating in stages The purpose of ult...

Embodiment 3

[0058] A preparation method of cellulose composite airgel, the steps are as follows:

[0059] Step 1. Pretreatment of durian shells: Cut the collected discarded durian shells evenly into small pieces, then clean the dirt on the surface, vacuum dry at 60°C for 36 hours, and pulverize them in a pulverizer , sieved, and the particle size is 100 ~ 200 mesh shell powder, stand-by;

[0060] Step 2. Preparation of carboxylated nanocellulose: take a certain amount of shell powder in step 1, immerse in ammonium persulfate solution for 36 hours, and perform ultrasonic stirring at 80°C for 6 hours to obtain a suspension, and add a certain amount of distilled water for dilution, and then at a speed of 12000r.min -1 Centrifuge in a centrifuge, centrifuge to neutral at 8000 r.min -1 Collect the colloid in the upper layer at a rotating speed, put the obtained colloid into a freeze-drying box, and carry out vacuum freeze-drying at -20°C~-10°C for 12h~48h to obtain powdery carboxylated nanoc...

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Abstract

The purpose of the present invention is to provide a preparation method of cellulose composite airgel. The present invention uses durian shell as raw material to prepare carboxylated nanocellulose through ammonium persulfate oxidative degradation, and then prepares the prepared carboxylated nanocellulose Composite with cellulose dissolving solution, and prepare cellulose composite airgel through certain process conditions. The production process of the invention is green and environment-friendly, and the prepared cellulose airgel has higher strength and larger specific surface area.

Description

technical field [0001] The invention belongs to the field of synthesis of natural polymer materials, and in particular relates to a preparation method of cellulose composite airgel. Background technique [0002] As one of the abundant natural polymer biomass materials in nature, cellulose has good biocompatibility, renewability and biodegradability, which has attracted widespread attention. Cellulose-based airgel is A three-dimensional network is a highly porous material formed by removing the liquid solvent in it. At present, cellulose-based airgel has gradually entered all aspects of people's lives, and is widely used in cosmetics, catalysis, organ transplantation, adsorption, However, pure cellulose airgel has the disadvantages of poor toughness and small specific surface area. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of cellulose composite airgel. The present invention uses durian shell as raw material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08B15/04C08L1/02C08L1/08
CPCC08J9/28C08B15/04C08J2301/02C08J2401/08C08L1/02C08L2203/14C08L2205/02
Inventor 林向阳
Owner 林向阳
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