High-strength silicon dioxide aerogel powder and preparation method thereof

A silica and aerogel technology, applied in the field of nanomaterials, can solve the problems of aerogel microstructure and performance damage, complex related processes, etc., to achieve the effect of realizing industrial production, simplifying the entire process, and strong toughness

Pending Publication Date: 2020-11-06
上海上凝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, the related process is too complicated, and it will cause certain damage to the microstructure and performance of the airgel.

Method used

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  • High-strength silicon dioxide aerogel powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of microbial cellulose nanofibers:

[0039] Cut the large-sized coconut flakes into pieces and place them in 25% sulfuric acid to break up the network-like microbial cellulose nanofibers, react at 75°C for 4.5 h, filter with suction, wash 3 times, and then dry to obtain single dispersed microbial cellulose nanofibers;

[0040] Wherein, the mass ratio of coconut fruit and sulfuric acid is 1:6.

[0041] (2) Preparation of silica sol

[0042] Mix and stir 78 mL tetraethyl orthosilicate, 90 mL ethanol and 25 mL deionized water evenly, then add 2 mL 1% hydrochloric acid dropwise, stir for 1 h, then add 9 mL 0.1M ammonia water dropwise Add and stir to obtain a silica sol.

[0043] (3) Preparation of composite wet gel

[0044] Add the monodisperse microbial cellulose nanofibers prepared in step (1) to the silica sol prepared in step (2), stir at 200 rpm for 30 min, then let stand at 50°C for 100 min, then Mechanical pulverization for 7 min to obtain a comp...

Embodiment 2

[0050] (1) Preparation of microbial cellulose nanofibers:

[0051] Cut the large-sized coconut pieces into pieces and place them in 32% sulfuric acid to break up the network-like microbial cellulose nanofibers, react at 65°C for 3.5 h, filter with suction and wash 4 times, then dry to obtain the single dispersed microbial cellulose nanofibers;

[0052] The mass ratio of described coconut fruit and sulfuric acid is 1:5.

[0053] (2) Preparation of silica sol

[0054] Mix and stir 65 mL tetraethyl orthosilicate, 110 mL ethanol and 20 mL deionized water evenly, then add 1.8 mL 1% hydrochloric acid dropwise, stir for 1 h, then add 6.5 mL 0.1M ammonia water dropwise Add and stir to obtain a silica sol.

[0055] (3) Preparation of composite wet gel

[0056] Add the microbial cellulose nanofibers prepared in step (1) to the silica sol prepared in step (2), stir at 200 rpm for 22 min, then stand at 40°C for 140 min, and then mechanically pulverize for 5 min. min, to obtain a compos...

Embodiment 3

[0062] (1) Preparation of microbial cellulose nanofibers:

[0063] Cut the large-sized coconut pieces into pieces and place them in 40% sulfuric acid to break up the network-like microbial cellulose nanofibers, react at 55°C for 2.5 hours, filter with suction, wash 5 times, and then dry to obtain the microorganisms Cellulose nanofibers;

[0064] The mass ratio of described coconut fruit and sulfuric acid is 1:4.

[0065] (2) Preparation of silica sol

[0066] Mix 55 mL of tetraethyl orthosilicate, 120 mL of ethanol and 15 mL of deionized water and stir evenly, then add 1 mL of 1% hydrochloric acid dropwise, and after stirring for 1 h, add 7 mL of 0.1M ammonia water dropwise Add and stir to obtain a silica sol.

[0067] (3) Preparation of composite wet gel

[0068] Add the microbial cellulose nanofibers prepared in step (1) to the silica sol prepared in step (2), stir at 200 rpm for 35 min, then stand at 72°C for 35 min, and then mechanically pulverize for 9 min, to obtain...

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Abstract

The invention discloses silicon dioxide aerogel powder with high strength. The silicon dioxide aerogel powder is formed by compounding monodisperse microbial cellulose nanofibers and a silicon dioxidegel skeleton, wherein the particle size of the silicon dioxide aerogel powder is 5-40 microns, the specific surface area of the silicon dioxide aerogel powder is 400-850 m<2> / g, and the thermal conductivity of the silicon dioxide aerogel powder is 0.016-0.031 W / (m.K). The microbial cellulose nanofibers are obtained by treating nata de coco slices with sulfuric acid, the microbial cellulose nanofibers and silicon dioxide sol are mixed and gelled and then crushed, and supercritical drying is conducted to prepare the high-strength silicon dioxide aerogel powder which can be compounded with paint, concrete and the like for application to energy conservation and heat preservation in the fields of pipelines, buildings and the like.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a high-strength silicon dioxide airgel powder and a preparation method thereof. Background technique [0002] Airgel is a three-dimensional nanoporous material obtained after the wet gel is dried without changing the gel skeleton structure. The unique microstructure endows airgel materials with excellent characteristics such as ultra-low density, ultra-large specific surface area, ultra-high porosity, and ultra-low thermal conductivity. Among them, airgel powder can be mixed with paint, concrete, etc. for energy-saving and thermal insulation of pipelines and buildings. However, the unique nanoporous structure of aerogel also leads to its extremely poor mechanical properties, which will significantly reduce the mechanical properties of the material when it is used as a component of composite materials. [0003] Chinese patent applications with application number 201610214815...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B38/00
CPCC04B30/02C04B2201/32C04B14/064C04B16/0675C04B38/0045
Inventor 付蕊
Owner 上海上凝新材料科技有限公司
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