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SiO2 nano-wire reinforced silica aerogel composite material and preparation method thereof

A technology of silica and composite materials, applied in the direction of silica, silica, etc., can solve the problems of compatibility between reinforcement and sol, affect the mechanical properties of samples, and uneven dispersion of reinforcement, so as to shorten the preparation cycle , Mechanical performance improvement, high mechanical performance effect

Active Publication Date: 2016-12-21
北京中科海势科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The mechanical properties of the composite silica airgel prepared by these reinforcements have been greatly improved, but there are obvious shortcomings: the compatibility of the reinforcement and the sol
Therefore, after the gel is formed, there are problems such as uneven dispersion or even agglomeration of the reinforcement, which affects the mechanical properties of the sample and even affects other physical properties.

Method used

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  • SiO2 nano-wire reinforced silica aerogel composite material and preparation method thereof
  • SiO2 nano-wire reinforced silica aerogel composite material and preparation method thereof
  • SiO2 nano-wire reinforced silica aerogel composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) SiO 2 Preparation of Nanofilaments

[0049] Take 30g of polyvinylpyrrolidone with a molecular weight of 4000 in 300ml of n-pentanol, ultrasonically dissolve, add 30ml of ethanol, 8.4ml of water, and 3ml of sodium citrate solution with a concentration of 0.18mol / L, mix well and add 6ml of a mass fraction of 25% -28% ammonia water, mix well and then add 3ml tetraethyl orthosilicate, mix well and put it in a water bath at 90°C for 3 hours, take it out, centrifuge and wash to get SiO with a diameter of 180-220nm and a length of 18-22μm 2 nanowires.

[0050] (2) Preparation of wet gel

[0051] Mix 11.7ml absolute ethanol, 5.6ml tetraethyl orthosilicate and 1.8ml water evenly, adjust the pH to 2 with dilute hydrochloric acid, stir for 30min, the system is hydrolyzed to form silica sol, add 0.05g SiO 2 Nanofilaments, after mixing evenly, add ammonia water to adjust the pH to 7, and wait for the wet gel to be prepared.

[0052] (3) Aging, modification and drying of wet ...

Embodiment 2

[0056] (1) SiO 2 Preparation of Nanofilaments

[0057] Take 30g of polyvinylpyrrolidone with a molecular weight of 4000 in 300ml of n-pentanol, ultrasonically dissolve, add 30ml of ethanol, 8.4ml of water, and 3ml of sodium citrate solution with a concentration of 0.18mol / L, mix well and add 6ml of a mass fraction of 25% -28% ammonia water, mix well and then add 3ml tetraethyl orthosilicate, mix well and put it in a water bath at 90°C for 3 hours, take it out, centrifuge and wash to get SiO with a diameter of 180-220nm and a length of 18-22μm 2 nanowires.

[0058] (2) Preparation of wet gel

[0059] Mix 11.7ml of absolute ethanol, 5.6ml of tetraethyl orthosilicate and 1.8ml of water evenly, adjust the pH to 2 with dilute hydrochloric acid, stir for 30min, the system is hydrolyzed to form a silica sol, add 0.1g of SiO 2 Nanofilaments, after mixing evenly, add ammonia water to adjust the pH to 7, and wait for the wet gel to be prepared.

[0060] (3) Aging, modification and d...

Embodiment 3

[0063] (1) SiO 2 Preparation of Nanofilaments

[0064] Take 30g of polyvinylpyrrolidone with a molecular weight of 4000 in 300ml of n-pentanol, ultrasonically dissolve, add 30ml of ethanol, 8.4ml of water, and 3ml of sodium citrate solution with a concentration of 0.18mol / L, mix well and add 6ml of a mass fraction of 25% -28% ammonia water, mix well and then add 3ml tetraethyl orthosilicate, mix well and put it in a 90°C water bath for 90min, take it out, centrifuge and wash to get SiO with a diameter of 180-220nm and a length of 8-12μm 2 nanowires.

[0065] (2) Preparation of wet gel

[0066] Mix 11.7ml absolute ethanol, 5.6ml tetraethyl orthosilicate and 1.8ml water evenly, adjust the pH to 2 with dilute hydrochloric acid, stir for 30min, the system is hydrolyzed to form silica sol, add 0.05g SiO 2 Nanofilaments, after mixing evenly, add ammonia water to adjust the pH to 7, and wait for the wet gel to be prepared.

[0067] (3) Aging, modification and drying of wet gel

...

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Abstract

The invention discloses a SiO2 nano-wire reinforced silica aerogel composite material, which is formed by compounding SiO2 nano-wires having a length of 0.05-100 [mu]m and a silica aerogel, wherein the silica aerogel is adopted as a matrix, the SiO2 nano-wires are adopted as a reinforcing body, and the content of the SiO2 nano-wires is 0.5-40% of the total mass of the composite material. The invention further discloses a preparation method of the SiO2 nano-wire reinforced silica aerogel composite material. The preparation method comprises: adding SiO2 nano-wires having a length of 0.05-100 [mu]m to a silica sol to make the SiO2 nano-wires and the silica sol be subjected to uniform mixing dispersion, forming a wet gel, aging, modifying, and drying to prepare the SiO2 nano-wire reinforced silica aerogel composite material. According to the present invention, the prepared SiO2 nano-wire reinforced silica aerogel composite material has advantages of good dispersion, high compatibility and the like, wherein the mechanical performance of the silica aerogel is improved, and the practical application requirement can be met.

Description

technical field [0001] The invention relates to the field of preparation of silica airgel, in particular to a SiO 2 Nanowire reinforced silica airgel composite material and its preparation method. Background technique [0002] Silica airgel is a lightweight porous non-static solid material, which has the characteristics of low density, high porosity, high specific area, and low thermal conductivity. Because of its high porosity and micro-mesoporous pores, it has good heat insulation effect, which makes it of high research and application value in the fields of heat insulation and heat resistance materials, and because it can withstand thousands of degrees Celsius High temperature, so it has great application prospects in military, national defense, aerospace, building materials, public facilities and other fields. [0003] But precisely because of SiO 2 The large porosity of airgel makes it poor in toughness and low in strength, which greatly limits its application in rea...

Claims

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Application Information

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IPC IPC(8): C01B33/16C04B30/02
CPCC01B33/16C01P2004/03C04B30/02C04B14/06
Inventor 唐小兵孙爱华储成义于明利马思郭建军许高杰
Owner 北京中科海势科技有限公司