Aerogel material composed of fibers and adhesive, and preparation method and application thereof

A binder and airgel technology, applied in the field of airgel materials and its preparation, can solve the problems of fiber-based airgel preparation methods and performance limitations

Active Publication Date: 2018-04-03
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the reported fiber-based aerogels are limited to varying degrees in terms of preparation methods and properties.

Method used

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  • Aerogel material composed of fibers and adhesive, and preparation method and application thereof
  • Aerogel material composed of fibers and adhesive, and preparation method and application thereof
  • Aerogel material composed of fibers and adhesive, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Dissolve the binder starch in water to form a homogeneous solution; disperse cotton fibers with an average diameter of 5 μm and an aspect ratio of 10,000 in the above solution to form a suspension; the mass fraction of cotton fibers in the suspension is 10 %, the mass fraction of binder starch is 2%. The suspension is aged at room temperature for 10 hours to obtain a solidified body; the solid water in the solidified body is removed by freeze-drying to obtain an adhesive / fiber aerogel. The apparent density of the airgel material is 0.1g / cm 3 , the average pore size is 100μm, and the sound absorption coefficient is as image 3 shown.

Embodiment 2

[0050] The binder precursor benzoxazine is dissolved in dioxane to form a homogeneous solution; the polyimide fiber with an average diameter of 200nm and an aspect ratio of 5000 is dispersed in the above solution to form a suspension; the The mass fraction of the polyimide fiber in the suspension is 1%, and the mass fraction of the binder precursor benzoxazine is 0.2%. Freeze the suspension at -4°C for 2 hours to obtain a solidified body; use freeze-drying to remove the solid dioxane in the solidified body to obtain a binder precursor fiber aerogel; thermally polymerize at 200°C Treat for 2h to polymerize the binder precursor to obtain the binder / fiber aerogel. The apparent density of the airgel material is 10mg / cm 3 , with an average pore size of 50 μm and good tensile properties (such as Figure 4 shown), excellent twisting performance and bending performance, and its microscopic morphology is as follows Figure 7-9 shown.

Embodiment 3

[0052] Dissolve the adhesive polyurethane in tert-butanol to form a homogeneous solution; disperse silica fibers with an average diameter of 300nm and an aspect ratio of 8000 in the above solution to form a suspension; The mass fraction of silicon fiber is 20%, and the mass fraction of adhesive polyurethane is 5%. The suspension was subjected to sol-gelation treatment at 50° C. for 24 hours to obtain a solidified body; the solid tert-butanol in the solidified body was removed by vacuum drying to obtain an adhesive / fiber airgel. The apparent density of the airgel material is 0.2g / cm 3 , with an average pore size of 5 μm and good tensile properties (such as Figure 5 shown).

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Abstract

The invention relates to an aerogel material composed of fibers and an adhesive, and a preparation method and application thereof. The method comprises the following steps: dissolving the adhesive and/or an adhesive precursor in a solvent so as to form a solution; dispersing, but not dissolving, the fibers in the solution so as to form a suspension; subjecting the suspension to solidification, wherein after solidification of the suspension, the fibers and the adhesive or adhesive precursor are fixed to form a three-dimensional continuous net structure; and removing the solidified solvent in the obtained solid, and replacing the solvent with air and maintaining the original spatial structure of the fibers. The aerogel material provided by the invention has excellent mechanical properties and has good application prospects in the fields of thermal insulation, sound absorption, environmental treatment, clean energy, electronic information, biomedicine, etc.

Description

technical field [0001] The invention relates to the field of airgel materials, in particular to an airgel material constructed of fibers and binders and its preparation method and application. Background technique [0002] During the drying process of the wet gel, the solvent is replaced by air, while the gel skeleton and pore structure are not destroyed, and the resulting porous material is called aerogel. It has structural characteristics such as extremely low apparent density, high porosity and high specific surface area, endowing airgel with many excellent physical properties, such as low thermal conductivity and high sound absorption coefficient. Combining the above advantages, airgel has broad application prospects in the fields of thermal insulation, adsorption materials, energy, sensors, and catalysts. [0003] Silica airgel, as the earliest researched airgel material, is made of tetraethyl orthosilicate as a monomer, sol, gel, aging, solvent replacement, and drying...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02C08L3/02C08L79/08C08L79/04C08L61/16C08L5/08C08L33/08C08L77/10C08L63/00C08L23/06C08L61/06C08L25/06C08L97/00C08K3/36C08K3/22
CPCC08J9/28C08J2201/0482C08J2201/0484C08J2205/028C08J2301/02C08J2305/08C08J2323/06C08J2325/06C08J2361/16C08J2375/04C08J2377/10C08J2379/08C08J2397/00C08J2403/02C08J2433/08C08J2461/06C08J2463/00C08J2479/04C08K3/22C08K3/36C08K2003/2248C08L2203/14C08L2205/16C08L75/04C08L97/005
Inventor 钱振超郭靖赵宁徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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