Flexible gas-retardant gas gel, its preparation method and application

A kind of airgel and flexible technology, applied in the field of airgel, can solve the problems of limited use, airgel can not meet product use standards, harmful gas safety hazards, etc., to achieve enhanced mechanical strength, good heat insulation effect, excellent The effect of bending flexibility

Active Publication Date: 2021-10-15
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 gas-retardant gas gel, its preparation method and application
  • Flexible gas-retardant gas gel, its preparation method and application
  • Flexible gas-retardant gas gel, its preparation method and application

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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

A flexible gas-retardant gas gel, its preparation method and application, belong to the technical field of airgel. The flexible gas-retardant gas gel is made of the following raw materials: nanocellulose, sodium alginate, organosilane, boric acid, sodium tetraborate decahydrate, calcium carbonate and D-(+)-glucono δ-lactone, wherein, Nanocellulose includes cellulose nanowires and surface carboxyl-rich cellulose nanofibrils. The invention utilizes the morphological and structural characteristics of the high aspect ratio of cellulose nanowires to increase the degree of correlation between single nanocellulose to increase the flexibility of the aerogel, and utilizes the essential flame retardant properties of sodium alginate and the boron system resistance The synergistic flame retardancy of the flame retardant has broad application prospects in the fields of aerospace, construction, flame retardancy and heat insulation of special-shaped parts.

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 Patents(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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