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Three-dimensional carbon fiber based aerogel material and preparation method thereof

A technology of three-dimensional carbon fiber and airgel, which is applied in the field of three-dimensional carbon fiber-based airgel materials and its preparation, can solve the problems of inability to obtain fiber-structured airgel, long time-consuming, complicated preparation process, etc., and achieve good structural controllability , simple preparation process and wide application prospects

Active Publication Date: 2013-08-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two preparation methods require a sol-gel process, so the selection of raw materials is limited. At the same time, the gel preparation process is complicated and time-consuming, and the final carbon airgel is essentially a particulate airgel. The addition of fibers Only a part of the composite material is constructed, acting as a template or reinforcement, so the resulting material cannot obtain the advantages of fiber-structured airgel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of a three-dimensional carbon fiber-based airgel material, the specific steps are:

[0035] The first step: dispersing bamboo pulp fibers with an average diameter of 2 μm and an aspect ratio of 5000 in water to form a homogeneous suspension; in the suspension, the mass fraction of fibers is 1%;

[0036] Step 2: aging the suspension at 25°C for 12 hours to make the suspension form a coagulated block;

[0037] The third step: using supercritical drying method to remove the solidified water in the solidified block to form uncrosslinked fiber-based airgel;

[0038] Step 4: subjecting the uncrosslinked fiber-based airgel to thermal crosslinking treatment for 2 hours to obtain a three-dimensional fiber-based airgel material bonded and fixed at interlaced points of fibers;

[0039] Step 5: Pre-oxidize the cross-linked fiber-based aerogel obtained in step 4 to 200°C under air atmosphere, then raise the temperature to 1600°C under nitrogen protection, perfo...

Embodiment 2

[0041] A preparation method of a three-dimensional carbon fiber-based airgel material, the specific steps are:

[0042] Step 1: Disperse lignin fibers with an average diameter of 0.3 μm and an aspect ratio of 10,000 in ethanol to form a homogeneous suspension; in the suspension, the mass fraction of fibers is 0.1%;

[0043] Step 2: aging the suspension at 30°C for 15 hours to make the suspension form a coagulated block;

[0044] The third step: using supercritical drying method to remove the solidified ethanol in the solidified block to form uncrosslinked fiber-based airgel;

[0045] The fourth step: subjecting the uncrosslinked fiber-based airgel to cross-linking treatment by ultraviolet radiation for 10 minutes to obtain a three-dimensional fiber-based airgel material bonded and fixed at the interlaced points of fibers;

[0046] Step 5: Pre-oxidize the cross-linked fiber-based airgel obtained in Step 4 to 200°C in an air atmosphere, then raise the temperature to 1000°C unde...

Embodiment 3

[0048] A preparation method of a three-dimensional carbon fiber-based airgel material, the specific steps are:

[0049] The first step: disperse polyparaphenylene terephthalamide fibers with an average diameter of 200nm and an aspect ratio of 30,000 in tert-butanol to form a homogeneous suspension; in the suspension, the fibers The mass fraction is 0.05%;

[0050] Step 2: freeze the suspension at -196°C for 5 minutes to form a coagulated block;

[0051] The third step: using freeze-drying method to remove the solidified tert-butanol in the solidified block to form uncrosslinked fiber-based airgel;

[0052] Step 4: Subjecting the uncrosslinked fiber-based airgel to cross-linking treatment by microwave irradiation for 30 minutes to obtain a three-dimensional fiber-based airgel material bonded and fixed at interlaced points of fibers;

[0053] Step 5: Pre-oxidize the cross-linked fiber-based aerogel obtained in Step 4 to 260°C under air atmosphere, then raise the temperature to...

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Abstract

The invention relates to a three-dimensional carbon fiber based aerogel material and a preparation method thereof. The preparation method comprises the following steps of: first, dispersing fiber in a solvent to form a turbid liquid; then, curing the turbid liquid to form a cured block; then, removing the cured solvent in the cured block to form an uncrosslinked fiber based aerogel; and crosslinking and stabilizing the uncrosslinked fiber based aerogel and pre-oxidizing and carbonizing to obtain the three-dimensional carbon fiber based aerogel material. The product is a three-dimensional network-shaped material formed by carbon fibers in a penetrated and staggered mode. The fiber crosslinking points show effective bonding and interconnection of bonding effect of non-hydrogen bond. The volume density is 0.1-500mg / cm<3>, the average aperture is 0.01-200mu m, and the specific surface area is 0.2-2000m<2> / g. The preparation process is simple and the raw material limit is less. The three-dimensional carbon fiber based aerogel product has good flexibility, connectivity and conductivity, and has a wide application prospect in many fields.

Description

technical field [0001] The invention relates to a three-dimensional carbon fiber-based airgel material and a preparation method thereof, belonging to the technical field of functional materials. Background technique [0002] Carbon airgel is usually a new type of nanoporous carbon material with a cross-linked structure produced by solid-phase carbonization of organic aerogels. It has low density, high specific surface area, high porosity, and low thermal conductivity. , strong adsorption / catalysis ability, good heat and sound insulation performance, etc., and is the only aerogel with electrical conductivity and chemical stability, so it can be used in energy, information, environmental protection, medicine, electronics, electricity, catalysis and basic scientific research and other fields have broad application prospects. At present, its preparation method is mainly to firstly prepare organic aerogels through sol-gel technology combined with supercritical / normal pressure dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B32/05
Inventor 丁彬唐晓敏斯阳葛建龙黄美玲朱婕俞建勇
Owner DONGHUA UNIV
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