Block aerogel composite material and preparation method thereof

A composite material and aerogel technology, applied in the field of bulk aerogel composite materials and their preparation, can solve the problems of breaking or separating from fibers, falling off of aerogel fragments, and high hardness of the composite, so as to improve mechanical properties. , The effect of reducing preparation cost and high specific surface area

Inactive Publication Date: 2012-12-05
GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resulting composite is relatively hard, and the particles will be broken or separated

Method used

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  • Block aerogel composite material and preparation method thereof
  • Block aerogel composite material and preparation method thereof
  • Block aerogel composite material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0087] In the preparation of the organosol, those skilled in the art can select or adjust the ratio of each component according to the actual situation, so as to obtain the desired organosol.

[0088] According to an embodiment of the present invention, the organic sol precursor used is resorcinol and formaldehyde, the alkaline catalyst is sodium carbonate, and the molar ratio of resorcinol:formaldehyde:water:sodium carbonate may be 1:1.5 ~2.5: 50 to 1500: 0.001 to 0.1, preferably 1: 1.8 to 2.2: 50 to 1000: 0.002 to 0.1, preferably 1: 1.8 to 2.0: 150 to 500: 0.005 to 0.05.

[0089] When the sol is a metal oxide sol, the specific operation steps may include: uniformly mixing the precursor of the metal oxide sol with alcohol and water, then adding an acid catalyst and stirring to obtain the metal oxide sol.

[0090] It should be understood that the materials used in the preparation process of the metal oxide sol are not particularly limited. The organic sol precursors include butyl tit...

Example Embodiment

[0112] Example 1

[0113] The pre-cultured seed culture of Acetobacter xylinum was inoculated into 12L of Acetobacter xylinum fermentation culture at an inoculum of 10%, shaken sufficiently, and placed in a constant temperature of 30℃ for 15 days to obtain a cellulose hydrogel. . The fermentation broth of Acetobacter xylinum contains 2% glucose, 0.5% peptone, 0.5% yeast powder, 0.27% disodium hydrogen phosphate pentahydrate, 0.115% citric acid-water compound, pH 6.0, and high temperature sterilization for 20 minutes.

[0114] The cellulose hydrogel fermented by microorganisms was placed in a 5% NaOH aqueous solution at 90°C for 10 hours, and then placed in deionized water at 85°C for 15 hours. During this period, the deionized water was replaced 3 times, and the volume ratio was 1: The mixture of 1 tert-butanol and deionized water is solvent replaced at 60°C for 10 hours, during which the mixture is replaced twice, and the sample is freeze-dried until the sample is completely dry ...

Example Embodiment

[0118] Example 2

[0119] The pre-cultured seed culture of Acetobacter xylinum was inoculated into 10L of the fermentation culture of Acetobacter xylinum at an inoculum of 12%, shaken sufficiently, and placed in a constant temperature of 30℃ for 20 days to obtain a cellulose hydrogel. . The fermentation broth of Acetobacter xylinum contains glucose 4%, peptone 0.8%, yeast powder 0.5%, disodium hydrogen phosphate pentahydrate 0.35%, citric acid-water compound 0.115%, pH 6.2, and high temperature sterilization for 20 minutes.

[0120] The cellulose hydrogel fermented by microorganisms was placed in a 6% NaOH aqueous solution at 90°C for 8 hours, and then placed in deionized water at 85°C for 15 hours. The deionized water was replaced 3 times during the period, and the volume ratio was 1: The mixture of 1 tert-butanol and deionized water is subjected to solvent replacement at 58°C for 10 hours, during which the mixture is replaced twice, and the sample is freeze-dried until the sampl...

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Abstract

The invention discloses a block aerogel composite material and a preparation method thereof. The block aerogel composite material consists of reticular cellulose nano fiber skeletons and sol in a combining way, wherein the porosity of the aerogel composite material is 80-99.5 percent, the density is 0.015-0.680g/cm<3>, the BET specific surface area is 150-1200m<2>/g, the coefficient of heat conductivity is 0.015-0.045Wm<-1>k<-1> and the modulus of elasticity is 0.5-150MPa. The block aerogel composite material provided by the embodiment of the invention has the advantages that since the material consists of the reticular cellulose nano fiber skeletons and the sol in the combining way, the mechanical property of the block aerogel composite material can be obviously improved, the heat conductivity is low, the density is small and the specific surface area is large; and besides, the equipment cost can be decreased by adopting a relatively low and safe freeze-drying method to replace the traditional supercritical drying method.

Description

technical field [0001] The invention relates to the technical field of composite materials, and more specifically, the invention relates to a bulk airgel composite material and a preparation method thereof. Background technique [0002] Airgel is a special gel that replaces the liquid in the gel with gas without essentially changing the network structure or volume of the gel itself. It is the product of hydrogel or organic gel after drying. It has the characteristics of nano-scale porous structure and high porosity, and is one of the solid materials with the smallest density known so far. Due to the characteristics of large specific surface area, high porosity, low density, and low thermal conductivity, aerogels have great application potential in super insulators, high-energy physics, high-efficiency catalysts and catalyst carriers, and energy storage materials. At the same time, the ultra-low density and ultra-high specific surface area of ​​bulk airgel make it very promi...

Claims

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Application Information

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IPC IPC(8): C04B30/02
Inventor 向军辉赛华征邢丽宋波赵春林李真酉
Owner GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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