Three-dimensional inorganic fiber-base aerogel material and preparation method thereof

An inorganic fiber and airgel technology, applied in the field of three-dimensional inorganic fiber-based airgel materials and their preparation, can solve the problem of the difficulty in realizing the controllable preparation of airgel materials with an all-inorganic fiber structure, and the difficulty in reflecting the advantages and functions of fiber structures characteristics, narrow range of raw material selection, etc., to achieve good structural adjustability, good flexibility and connectivity, and less raw material restrictions

Active Publication Date: 2015-04-08
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above methods, the fibers are added to the precursor of the inorganic sol as a filling material, and the prepared airgel is essentially a particle-aggregated inorganic airgel material, and the fibers only exist as reinforcing components in the material structure. Therefore, it is difficult for the material to reflect the advantages and functional characteristics of the fiber structure.
In addition, the above methods all need to prepare the inorganic precursor sol first, which leads to the disadvantages of complex preparation process, long time-consuming, narrow range of raw material selection, etc.
Therefore, the methods disclosed in the above-mentioned patents are difficult to realize the controllable preparation of all-inorganic fiber-structured airgel materials.

Method used

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  • Three-dimensional inorganic fiber-base aerogel material and preparation method thereof
  • Three-dimensional inorganic fiber-base aerogel material and preparation method thereof
  • Three-dimensional inorganic fiber-base aerogel material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A preparation method of a three-dimensional inorganic fiber-based airgel material, the specific steps are:

[0034] The first step: disperse hydroxypropyl cellulose / lanthanum nitrate hybrid fibers with an average diameter of 1 μm, an aspect ratio of 5000, and a lanthanum nitrate content of 10wt% in water to form a homogeneous suspension; the suspension In, the mass fraction of fiber is 30%;

[0035] Step 2: aging the suspension at 25°C for 13 hours to make the suspension form a coagulated block;

[0036] The third step: using supercritical drying method to remove the solidified water in the solidified block to form uncrosslinked fiber-based airgel;

[0037] Step 4: subjecting the uncrosslinked fiber-based airgel to thermal crosslinking treatment for 3 hours to obtain a three-dimensional fiber-based airgel material bonded and fixed at interlaced points of fibers;

[0038] Step 5: Calcining the cross-linked fiber-based aerogel obtained in the fourth step at 400°C for 20...

Embodiment 2

[0042] A preparation method of a three-dimensional inorganic fiber-based airgel material, the specific steps are:

[0043] Step 1: Disperse chitin / cerium nitrate hybrid fibers with an average diameter of 0.01 μm, an aspect ratio of 50,000, and a cerium nitrate content of 90wt% in tert-butanol to form a homogeneous suspension; the suspension In the liquid, the mass fraction of fiber is 0.5%;

[0044] Step 2: aging the suspension at 30°C for 12 hours to make the suspension form a coagulated block;

[0045] The third step: adopting a supercritical drying method to remove the solidified tert-butanol in the solidified block to form an uncrosslinked fiber-based airgel;

[0046] Step 4: subjecting the uncrosslinked fiber-based airgel to thermal crosslinking treatment for 3 hours to obtain a three-dimensional fiber-based airgel material bonded and fixed at interlaced points of fibers;

[0047] The fifth step: Calcining the cross-linked fiber-based airgel obtained in the fourth step ...

Embodiment 3

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

[0053] The first step: disperse the nitrocellulose / nitrocellulose hybrid fiber with an average diameter of 0.1 μm, an aspect ratio of 5, and a nitrocellulose content of 79wt% in water to form a homogeneous suspension. The mass fraction of nitrocellulose / nitrified praseodymium hybrid fiber is 0.05%; the gelatin / nitrated neodymium hybrid fiber with an average diameter of 0.2 μm, an aspect ratio of 3000, and a nitrated neodymium content of 80wt% is dispersed in tert-butanol to form A homogeneous suspension, in which the fiber mass fraction is 0.05%; two fiber suspensions are mixed to form a mixed suspension;

[0054] Step 2: freeze the suspension at -196°C for 5 minutes to form a coagulated block;

[0055] Step 3: remove the water and tert-butanol solidified in the solidified block by freeze-drying to form uncrosslinked fiber-based airgel;

[0056] The fourth step...

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Abstract

The invention relates to a preparation method of a three-dimensional inorganic fiber-base aerogel material and a product thereof. The preparation method comprises the following steps: dispersing polymer / inorganic precursor hybrid fibers in a solvent to form a suspension; solidifying to form a solidified block; removing the solidified solvent to form an uncrosslinked fiber-base aerogel; and carrying out crosslinking stabilizing treatment on the uncrosslinked fiber-base aerogel, and calcining to obtain the three-dimensional inorganic fiber-base aerogel material. The three-dimensional inorganic fiber-base aerogel material is a three-dimensional network material formed by interpenetrated and crossed inorganic fibers; the cross point of fibers has effective adhesive interconnection under non-hydrogen bonding action; and the volume density of the three-dimensional inorganic fiber-base aerogel material is 0.1-500 mg / cm<3>, the average pore size is 0.01-2000 mu m, and the specific area is 0.2-2000 m<2> / g. The preparation method has the advantages of simple technique and fewer limits to raw materials; and the three-dimensional inorganic fiber-base aerogel product has favorable flexibility, connectivity and temperature tolerance, and thus, has wide application prospects in many fields.

Description

technical field [0001] The invention relates to a three-dimensional inorganic fiber-based airgel material and a preparation method thereof, belonging to the technical field of functional fiber materials. Background technique [0002] Airgel is an ultra-light porous condensed matter with a three-dimensional network structure that uses gas as a dispersion medium. In 1931, Kistler of Stanford University in the United States prepared the world's first airgel by hydrolyzing water glass. By the 1960s, with the deepening of sol-gel method research and the gradual improvement of supercritical drying technology, airgel Research on gel materials has been rapidly developed. At present, the research on airgel materials mainly focuses on inorganic airgel materials. The preparation method is mainly through the combination of sol-gel technology and supercritical drying technology to obtain a three-dimensional porous network constructed by the mutual aggregation of inorganic colloidal tiny...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/14
Inventor 丁彬黄美玲斯阳葛建龙唐晓敏朱婕俞建勇
Owner DONGHUA UNIV
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