Modified three-dimensional fiber-based aerogel material and preparation method thereof

A fiber-based and aerogel technology is applied in the field of modified three-dimensional fiber-based aerogel materials and their preparation, which can solve the problems of narrow selection of raw materials, no modified fiber-based aerogel materials, and complicated preparation process. , to achieve the effects of good flexibility and connectivity, good structural controllability, and simple preparation process

Active Publication Date: 2013-09-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the obtained aerogel is a silicon particle type aerogel, the modification method can be single, and it has the disadvantages of being brittle, hard and brittle, and poor in structure adjustability.
Foreign patents US8298622 and US6004436 respectively disclose a method for preparing modified inorganic airgel by combining ion beam and reactive gas, a coating modified airgel reaction carrier and its preparation method, the above four items The modified aerogels involved in the patent are all particle-type aerogels, which require a complex sol-gel process, resulting in the disadvantages of complex preparation process, long time-consuming, and narrow range of raw material selection.
In addition, limited by the selection range of airgel raw materials, the modification methods it can adapt to are limited, and the obtained functions cannot meet the different needs of many fields.
However, there is no research on modified fiber-based airgel materials reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of a modified three-dimensional fiber-based airgel material, the specific steps are:

[0041] The first step: disperse hydroxypropyl cellulose fibers with an average diameter of 10 μm and an aspect ratio of 4000 in water to form a homogeneous suspension; in the suspension, the mass fraction of fibers is 6%; subsequently, Disperse the titanium dioxide particles into the suspension by physical methods to form a composite suspension with the fibers, the mass fraction of the titanium dioxide particles is 6%, and the average particle size is 10nm;

[0042] Step 2: freeze the suspension or the composite suspension at -30°C for 6 hours to make the suspension form a coagulated block;

[0043] Step 3: Freeze drying and vacuum drying are used to remove the solidified water in the solidified block to form uncrosslinked fiber-based airgel;

[0044] Step 4: subject the uncrosslinked fiber-based airgel to cross-linking treatment by plasma irradiation for 15 minu...

Embodiment 2

[0046] A preparation method of a modified three-dimensional fiber-based airgel material, the specific steps are:

[0047] Step 1: Disperse polylactic acid fibers with an average diameter of 500nm and an aspect ratio of 10,000 in a mixed solvent of water and tert-butanol to form a homogeneous suspension; in the suspension, the mass fraction of fibers is 0.01%; Subsequently, the ferric oxide is physically dispersed in the suspension to form a composite suspension with the fiber, the mass fraction of the ferric oxide particles is 4%, and the average particle diameter is 20nm;

[0048] Step 2: Aging the suspension or the composite suspension at 25°C for 12 hours to make the suspension form a coagulated block;

[0049] The third step: using supercritical drying method to remove the coagulated water and tert-butanol in the coagulated block to form uncrosslinked fiber-based airgel;

[0050] Step 4: The uncrosslinked fiber-based aerogel is subjected to ultrasonic cross-linking treatm...

Embodiment 3

[0052] A preparation method of a modified three-dimensional fiber-based airgel material, the specific steps are:

[0053] The first step: disperse titanium dioxide nanowires / rods with an average diameter of 30nm and an aspect ratio of 1000 in water to form a homogeneous suspension; in the suspension, the mass fraction of fibers is 2%; subsequently, the Activated carbon particles are dispersed into the suspension by physical methods to form a composite suspension with fibers, the mass fraction of activated carbon particles is 50%, and the average particle size is 50 μm;

[0054] Step 2: subjecting the suspension or the composite suspension to a sol treatment, so that the suspension forms a coagulated block;

[0055] The third step: using supercritical drying method to remove the solidified water in the solidified block to form uncrosslinked fiber-based airgel;

[0056] Step 4: The uncrosslinked fiber-based airgel is cross-linked by gamma ray irradiation for 5 minutes to obtain...

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Abstract

The invention relates to a preparation method of a modified three-dimensional fiber aerogel material and a modified three-dimensional fiber aerogel material product. The preparation method comprises the following steps of: preparing a fiber suspension or fiber / functional particulate matter composite suspension; processing the suspension by curing; removing a solvent cured in a curing block to obtain a non-cross-linking fiber-based aerogel; then processing by crosslinking stabilizing, or further processing by modifying to obtain the modified three-dimensional fiber-based aerogel material. The product is a three-dimensional network type material formed by the interfingering and staggering of the fibers, or the functional particles are dispersed into the three-dimensional network type material to form a composite structure; and the product has the volume density of 0.1 to 500mg / cm<3>, average pore size of 0.01 to 2,000 microns and specific surface area of 0.2 to 2,000m<2> / g. The preparation method is simple in preparation process and few in limitations to raw materials; and the modified three-dimensional aerogel material product is high in flexibility and connectivity and has a wide application prospect in a plurality of fields.

Description

technical field [0001] The present invention relates to a modified three-dimensional fiber-based airgel material and a preparation method thereof, in particular to a modified three-dimensional fiber-based airgel material obtained from one-dimensional fibers through a three-dimensional network reconstruction method and a preparation method thereof . Background technique [0002] Airgel is an ultra-light porous condensed matter with a three-dimensional network structure that uses gas as a dispersion medium, and is one of the smallest solids in the world. The structural feature of airgel is a cylindrical multi-branched nanoporous three-dimensional network structure with high permeability, which has extremely high porosity, extremely low density, high specific surface area, ultra-high pore volume ratio, and excellent structural properties. It has broad application prospects in the fields of energy, information, environmental protection, medicine, pesticides, metallurgy, catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
Inventor 丁彬朱婕斯阳葛建龙唐晓敏黄美玲俞建勇
Owner DONGHUA UNIV
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