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Preparation method of aerosil composite material

A technology of silica and composite materials, applied in the field of aerogel, can solve the problems of low thermal conductivity, strong adsorption, reduced aerogel performance, poor mechanical properties, etc. Highlight and overcome the effect of brittleness

Inactive Publication Date: 2017-06-20
江苏国科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this airgel powder will reduce the performance of the airgel itself, and cannot play the role of airgel's low thermal conductivity and strong adsorption.
And due to poor mechanical properties, the cracking of silica airgel is still a major obstacle; so silica airgel composites still need to be further studied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a silica airgel composite material. The silica airgel composite material uses silica as a matrix, glass fiber as a reinforcement, and a silane coupling agent as a fiber surface treatment agent. Ethyl acetate (TEOS) is silicon source material, and described preparation method comprises the following steps:

[0020] Weigh the silane coupling agent and add it to the beaker, add methanol and acetic acid solution with a volume ratio of 1:4, stir to dissolve the silane coupling agent, and then add silica airgel and surface-treated glass fiber to make the glass The fiber and silica gel sol are fully combined and dispersed evenly. After the gel is formed, it is aged for 6 hours. Alcohol solution and alkane are added to replace and modify, and the fiber-reinforced silica airgel composite material is obtained after drying; Supercritical drying is adopted, and the conditions of supercritical drying are: temperature 240° C., pressure 7.5 MPa, and drying time ...

Embodiment 2

[0026] A method for preparing a silica airgel composite material. The silica airgel composite material uses silica as a matrix, glass fiber as a reinforcement, and a silane coupling agent as a fiber surface treatment agent. Ethyl acetate (TEOS) is silicon source material, and described preparation method comprises the following steps:

[0027] Weigh the silane coupling agent and add it to the beaker, add methanol and acetic acid solution with a volume ratio of 1:4, stir to dissolve the silane coupling agent, and then add silica airgel and surface-treated glass fiber to make the glass The fiber and silica gel sol are fully combined and dispersed evenly. After the gel is formed, it is aged for 6.5 hours. Alcohol solution and alkane are added to replace and modify, and then dried to obtain a fiber-reinforced silica airgel composite material; Wherein, supercritical drying is adopted for drying, and the conditions of supercritical drying are: temperature 240° C., pressure 7.5 MPa, ...

Embodiment 3

[0033] A method for preparing a silica airgel composite material. The silica airgel composite material uses silica as a matrix, glass fiber as a reinforcement, and a silane coupling agent as a fiber surface treatment agent. Ethyl acetate (TEOS) is silicon source material, and described preparation method comprises the following steps:

[0034] Weigh the silane coupling agent and add it to the beaker, add methanol and acetic acid solution with a volume ratio of 1:4, stir to dissolve the silane coupling agent, and then add silica airgel and surface-treated glass fiber to make the glass The fiber and silica gel sol are fully combined and dispersed evenly. After the gel is formed, it is aged for 7 hours. Alcohol solution and alkane are added to replace and modify, and after drying, the fiber-reinforced silica airgel composite material is obtained. Dry Supercritical drying is adopted, and the conditions of supercritical drying are: temperature 240° C., pressure 7.5 MPa, and drying ...

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Abstract

The invention relates to the technical field of aerogel, in particular to a preparation method of an aerosil composite material. The method includes: weighing a silane coupling agent and adding it into a beaker, adding methanol and an acetic acid solution in a volume ratio of 1:4, performing stirring to dissolve the silane coupling agent, then adding glass fibre subjected to aerosol and surface treatment, letting the glass fiber and silicone sol fully integrate and disperse evenly, after gel forms, conducting aging, adding an alcohol solution and alkane for replacement modification respectively, and performing drying, thus obtaining the fiber reinforced aerosil composite material. Through introduction of a reinforcement body, the method provided by the invention effectively reduces the surface tension between holes, reinforces the strength of aerogel skeleton, overcomes the shortcomings of low strength and high brittleness of pure aerosil, avoids excessive volume contraction, structure collapse and other problems at the aging and drying stage, reduces surface cracks, and acquires the composite aerogel material with good blocking performance.

Description

technical field [0001] The invention relates to the technical field of airgel, in particular to a method for preparing a silica airgel composite material. Background technique [0002] Silica airgel is a new type of porous material with controllable structure, which has multiple unique properties, such as low refractive index, low elastic modulus, low thermal conductivity and strong adsorption, typical fractal structure, etc., can be It is made into various high-performance materials such as acoustic impedance coupling materials, filter materials, high-temperature heat insulation materials, etc., and has broad application prospects in many fields. [0003] In practical applications, silica airgel is usually used as a filling material in a powder state, and is filled into carriers such as heat insulation, noise reduction, shock absorption and energy absorption, adsorption, and catalyst. However, this airgel powder will reduce the performance of the airgel itself, and cannot ...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B111/20C04B111/27C04B111/40
CPCC04B30/02C04B2111/2046C04B2111/27C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B14/064C04B24/42C04B24/02C04B24/04C04B14/42C04B14/386
Inventor 杨亮
Owner 江苏国科新材料科技有限公司
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