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Flexible flame-retardant aerogel as well as preparation method and application thereof

An airgel and flexible technology, applied in the field of airgel, can solve problems such as limited use, failure of aerogel to meet product use standards, and potential safety hazards of harmful gases

Active Publication Date: 2021-04-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent flammability of cellulose limits its use, and the aerogels prepared from pure cellulose cannot meet the product use standards
Although traditional phosphorus-based and halogen-containing flame retardants can effectively improve the flame-retardant properties of materials, the harmful gases released after combustion still pose a safety hazard

Method used

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  • Flexible flame-retardant aerogel as well as preparation method and application thereof
  • Flexible flame-retardant aerogel as well as preparation method and application thereof
  • Flexible flame-retardant aerogel as well as preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0055] A preparation method of cellulose nanowires, the specific steps are as follows:

[0056] Disperse the purified cellulose powder in deionized water to obtain a dispersion with a mass fraction of 0.5%; treat the above dispersion with an ultrasonic cell pulverizer with a power of 800W for 30 minutes; The cellulose nanowires were obtained after dispersing for 10 minutes in a homogeneous disperser for 10 minutes.

Embodiment 1

[0058] A method for preparing a flexible gas-retardant gas gel, the specific steps are as follows:

[0059] S1, the above-mentioned cellulose nanofibrils and cellulose nanowires were prepared with deionized water to obtain a suspension with a mass fraction of 0.5%, and the two suspensions were mixed at a mass ratio of 3:1, and 150 g of the mixed suspension was weighed. Suspension: Prepare a sodium alginate solution with a mass fraction of 0.25% and weigh 150g, mix the above-mentioned mixed suspension with the sodium alginate solution, put it in a 500ml beaker, and perform magnetic stirring at 25°C at a speed of 1000r / min , to obtain a biopolymer mixture;

[0060] S2, weigh 0.5625g of methyltrimethoxysilane, add it dropwise to the biopolymer mixture obtained in step S1, adjust the pH to 4 with 0.5mol / L acetic acid; Magnetic stirring for 2h to carry out cross-linking to obtain a cross-linking solution;

[0061] S3, weigh 0.1125g of boric acid and 0.1125g of sodium tetraborate ...

Embodiment 2

[0066] A method for preparing a flexible gas-retardant gas gel, the specific steps are as follows:

[0067] S1, the above-mentioned cellulose nanofibrils and cellulose nanowires were prepared with deionized water to obtain a suspension with a mass fraction of 0.5%, and the two suspensions were mixed at a mass ratio of 3:1, and 150 g of the mixed suspension was weighed. Suspension: Prepare a sodium alginate solution with a mass fraction of 0.5% and weigh 150g, mix the above-mentioned mixed suspension with the sodium alginate solution, put it in a 500ml beaker, and carry out magnetic stirring at 25°C at a speed of 1000r / min , to obtain a biopolymer mixture;

[0068] S2, weigh 0.75g of methyltrimethoxysilane, add it dropwise to the biopolymer mixture obtained in step S1, adjust the pH to 4 with 0.5mol / L acetic acid; Magnetic stirring for 2h to carry out cross-linking to obtain a cross-linking solution;

[0069] S3, weigh 0.15g of boric acid and 0.15g of sodium tetraborate decah...

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Abstract

The invention discloses flexible flame-retardant aerogel as well as a preparation method and application thereof, and belongs to the technical field of aerogel. The flexible flame-retardant aerogel is prepared from the following raw materials: nanocellulose, sodium alginate, organosilane, boric acid, sodium tetraborate decahydrate, calcium carbonate and D-(+)-gluconic acid delta-lactone, and the nanocellulose comprises cellulose nanowires and cellulose nanofibers with carboxyl-rich surfaces. According to the invention, the degree of association between single nanocellulose is improved by utilizing the morphological structure characteristic of high length-diameter ratio of the cellulose nanowires so as to improve the flexibility of the aerogel, and the intrinsic flame retardant property of sodium alginate and the synergistic flame retardance of the boron-based flame retardant are utilized, so that the aerogel has wide application prospects in the fields of aerospace, buildings, special-shaped part flame retardance, heat insulation and the like.

Description

technical field [0001] The invention relates to a technology in the field of airgel, in particular to a flexible air-retarding airgel, its preparation method and application. Background technique [0002] Airgel is an ultra-light porous material with a porosity above 90%. Airgel with cellulose as the skeleton structure is the third generation of airgel after inorganic aerogel and organic aerogel. Cellulose aerogels are usually obtained from nanocellulose precursors through supercritical drying or freeze drying. Nanocellulose can be divided into cellulose nanowhiskers, cellulose nanofibrils and cellulose nanowires, and the aspect ratios of the three increase in sequence. Cellulose nanowhiskers have a low aspect ratio and high stiffness, and the resulting gel is brittle and brittle, while cellulose nanowires with a higher aspect ratio can form an entangled structure in the aerogel, thereby improving the air quality. The bending flexibility of the gel. The ultra-high porosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/075C08J3/24C08L1/02C08L5/04C08K3/26C08K3/38C08K5/5419C08K13/02
CPCC08J3/075C08J3/246C08J9/28C08J2201/0484C08J2205/026C08J2301/02C08J2401/02C08J2405/04C08K3/38C08K5/5419C08K13/02C08K2003/265C08K2003/387
Inventor 刘丽芳降帅张美玲李萌萌徐秋玉
Owner DONGHUA UNIV
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