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Preparation method of silica-ceramic cellulose composite material

A technology of silica and composite materials, applied in the field of materials, can solve problems such as difficult uniform mixing, volatilization, and low density of airgel powder, and achieve the effect of enhancing thermal stability and mechanical strength and broad application prospects

Inactive Publication Date: 2019-04-02
张家港市东威新材料技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely small density of airgel powder, it is not easy to mix evenly with fibers and infrared opacifiers, and the fibers and infrared opacifiers cannot be fully dispersed, so it is difficult to ensure the heat insulation performance and mechanical strength of the product
Especially when using an organic binder, when the operating temperature exceeds 300°C, the binder will burn and volatilize, resulting in a sharp drop in the high-temperature mechanical strength of the material

Method used

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Examples

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preparation example Construction

[0018] The invention discloses a method for preparing a silica-ceramic cellulose composite material, comprising:

[0019] (1) In the presence of acid, mix organosilicon, absolute ethanol, deionized water, and ceramic fiber, and stir magnetically in a water bath at 50-60°C for 4-24 hours to obtain a mixed solution;

[0020] (2) Add ammonia water to the mixed solution, adjust the pH to 9.0-11.0, and stir magnetically to obtain a silica-ceramic cellulose hydrogel;

[0021] (3) Import the silica-ceramic cellulose hydrogel into a mold, let it stand for 10 to 16 hours, demould, seal and age for 36 to 60 hours, soak in absolute ethanol and n-butanol for 1 to 2 hours to remove the solvent Replace and dry to obtain a silica-ceramic cellulose composite gel containing n-butanol solvent;

[0022] (4) Surface-modify the silica-ceramic cellulose composite gel containing n-butanol solvent with trimethylchlorosilane and n-hexane for 60-72 hours, wash with n-hexane, and dry in vacuum to obtai...

Embodiment

[0026] (1) In the presence of hydrochloric acid, mix ethyl orthosilicate, absolute ethanol, deionized water, and ceramic fibers, and magnetically stir for 12 hours in a water bath at 60°C to obtain a mixed solution;

[0027] (2) Add ammonia water to the mixed solution, adjust the pH to 9.0, and stir magnetically to obtain a silica-ceramic cellulose hydrogel;

[0028] (3) Import the silica-ceramic cellulose hydrogel into the mold, let it stand for 10 hours, remove the mold, seal and age for 48 hours, soak in absolute ethanol and n-butanol for 2 hours to replace the solvent, and dry to obtain Silica-ceramic cellulose composite gel containing n-butanol solvent;

[0029] (4) Surface-modify the silica-ceramic cellulose composite gel containing n-butanol solvent with trimethylchlorosilane and n-hexane for 72 hours, wash with n-hexane, and dry in vacuum to obtain silica-ceramic Cellulose composites.

[0030] In the present invention, the silica-ceramic cellulose composite gel is su...

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PUM

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Abstract

The invention discloses a preparation method of a silica-ceramic cellulose composite material, wherein the surface modification of a silica-ceramic cellulose composite gel by using trimethylchlorosilane and n-hexane is carried out for 60-72 hours, and finally the silica-ceramic cellulose composite material is obtained by washing with n-hexane, and vacuum drying. The thermal stability and mechanical strength of ceramic cellulose are enhanced by adding silica, and the silica-ceramic cellulose composite material has broad application prospects.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing a silica-ceramic cellulose composite material. Background technique [0002] The unique nanoporous structure of silica airgel material makes the pore diameter smaller than the mean free path of gas molecules, thereby limiting the convective heat transfer of gas molecules, and at the same time, the ultra-high porosity limits the solid-phase heat transfer of the material. In addition, The high-temperature radiation heat transfer of the material can be reduced by adding an appropriate amount of infrared opacifier. Therefore, silica airgel is considered to be the solid material with the best thermal insulation performance at present, and has broad application prospects in the field of thermal insulation materials. However, two Due to the huge surface tension of the silica airgel material during the drying process, the material itself has defects, and the extr...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B30/02C04B111/40
CPCC04B30/02C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B14/46C04B14/064C04B38/0074
Inventor 赵云龙
Owner 张家港市东威新材料技术开发有限公司
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