Sodium alginate-palm fiber composite aerogel as well as preparation method and application thereof

A composite airgel and sodium alginate technology, which is applied in the field of sodium alginate-palm fiber composite airgel and its preparation, can solve the problems of poor mechanical properties, inability to use in the construction field, lack of thermal insulation and sound absorption functions, etc.

Active Publication Date: 2021-03-19
YANCHENG INST OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sodium alginate aerogels in the prior art do not have the functions of heat preservation and sound absorption, and their mechanical properties are poor, so they cannot be used in the construction field.

Method used

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  • Sodium alginate-palm fiber composite aerogel as well as preparation method and application thereof
  • Sodium alginate-palm fiber composite aerogel as well as preparation method and application thereof
  • Sodium alginate-palm fiber composite aerogel as well as preparation method and application thereof

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preparation example Construction

[0035] The invention provides a kind of preparation method of sodium alginate-palm fiber composite airgel, comprises the steps:

[0036] Mixing the brown silk with the degumming solution and performing microwave treatment to obtain the degummed brown silk; the degumming solution includes sodium hydroxide, hydrogen peroxide, and crude oil and water;

[0037] The degummed palm silk is sequentially subjected to first freeze-drying and crushing to obtain palm microcrystalline cellulose;

[0038] After mixing sodium alginate, water and the palm microcrystalline cellulose, degassing and standing to obtain a composite hydrogel;

[0039] The composite hydrogel is subjected to the second freeze-drying to obtain the sodium alginate-palm fiber composite airgel.

[0040] In the present invention, brown silk is mixed with degumming liquid, and subjected to microwave treatment to obtain degummed brown silk; the degumming liquid includes sodium hydroxide, hydrogen peroxide, crude oil and wa...

Embodiment 1

[0064] 15g sodium hydroxide, 20g and crude oil, 15mL concentration are 30% hydrogen peroxide aqueous solution and 1015mL water mix, obtain degumming liquid; and crude oil; according to the ratio of brown silk and degumming liquid: 1g: 23mL, mix 45g of brown silk and degumming liquid, carry out microwave treatment, the temperature of microwave treatment is 95 ℃, the power is 500W, and the time of microwave treatment is 1.2h After the microwave treatment is completed, filter, then rinse the gained solid 5 times according to the ratio of 3600mL deionized water / 1g brown silk, to obtain degummed brown silk;

[0065] The degummed brown silk was frozen at -17°C for 4 hours, then freeze-dried at a temperature of -90°C and a vacuum of 5 Pa for 36 hours, and then pulverized 5 times in a traditional Chinese medicine pulverizer at a speed of 1000r / min. 2min, the time between pulverization is 5min, obtains 50g palm microcrystalline cellulose, and the length of described palm microcrystalli...

Embodiment 2

[0082] 18g sodium hydroxide, 22g and crude oil, 20mL concentration are 30% hydrogen peroxide and 1020mL water are mixed, obtain degumming liquid; Described and crude oil is the YS-85 model and Crude oil; mix 48g of brown silk with the degumming solution according to the proportion of brown silk and degumming solution 1g: 21.9mL, and carry out microwave treatment. The temperature of microwave treatment is 95°C, the power is 550W, and the time of microwave treatment is 1.5h After the microwave treatment is completed, filter, then rinse the gained solid with 4320mL / 1g deionized water for 5 times to obtain degummed brown silk;

[0083] The degummed brown silk was frozen at -17°C for 4 hours, then freeze-dried at a temperature of -90°C and a vacuum of 5 Pa for 36 hours, and then pulverized 5 times in a traditional Chinese medicine pulverizer at a speed of 1000r / min. 3min, the time between pulverization is 5min, obtains 50g palm microcrystalline cellulose, and the length of describe...

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Abstract

The invention provides sodium alginate-palm fiber composite aerogel as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: mixing palm fibers with degumming liquid, and carrying out microwave treatment to obtain degummed palm fibers, wherein the degumming liquid comprises sodium hydroxide, hydrogen peroxide, crude oil and water; sequentially carrying out first freeze drying and crushing on the degummed palm fibers to obtain palm microcrystalline cellulose; mixing sodium alginate, water and the palm microcrystalline cellulose, defoaming and standing to obtain composite hydrogel; and carrying out second freeze drying on the composite hydrogel to obtain the sodium alginate-palm fiber composite aerogel. The aerogel obtained by the invention has the advantages of porosity, low heat conduction coefficient, excellent thermal insulation property and excellent sound absorption function. Besides, the palm microcrystalline cellulose is used as a framework, so that the mechanical property of the aerogel is improved, and the aerogel can be used as an advanced building material, such as a thermal insulation material and a sound absorption material.

Description

technical field [0001] The invention relates to the technical field of gel materials, in particular to a sodium alginate-palm fiber composite airgel and a preparation method and application thereof. Background technique [0002] Sodium alginate is a pure natural polysaccharide polymer with wide sources, environment-friendly, high safety and good film-forming, thickening and gelling properties. Sodium alginate prepared from this raw material Airgel is known for its hydrophilicity, strong gel ability, good biocompatibility and biodegradability. It is a new type of porous material with high specific surface area, but its structure has low mechanical strength and uneven structure. , easy to collapse and other defects seriously limit its application in more fields. Sodium alginate aerogels have been improved in the existing technology and have been applied in more fields. For example, Li Yun prepared sodium alginate-silica composite aerogels, which improved the stability of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L5/04C08L1/04
CPCC08J9/28C08J2305/04C08J2401/04C08J2301/04C08J2405/04
Inventor 陈贵翠张立峰孙开进刘洪芹
Owner YANCHENG INST OF IND TECH
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