Rare earth toughened solid silica aerogel

一种硅气凝胶、增韧的技术，应用在气凝胶领域，能够解决导热系数下降等问题，达到提高耐热性、提高反应效率、压缩工艺时间的效果

Active Publication Date: 2018-12-18
TIANJIN LANGHUA TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The internal structure change of silica airgel above 500°C will lead to a sharp drop in thermal conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Below in conjunction with embodiment, content of the present invention is described in detail:

[0042] (1) Prepare a mixed solution of silicon source and solvent

[0043] Take a water glass with a molar number of 3.0 and put it into a reaction kettle, dilute it with 2.5 times the mass of deionized water, stir at 180 rpm for 30 minutes, and filter through a 200-mesh sieve to obtain a water glass solution.

[0044] (2) Sol

[0045] Take 8mol / L sulfuric acid, add zirconium sulfate salt (the zirconium sulfate salt is calculated by its zirconia, and the molar ratio of the silicon oxide of the water glass solution is 5:100), yttrium sulfate salt (the yttrium sulfate salt is calculated by its yttrium oxide, and The molar ratio of aluminum oxide is 1:100); after mixing evenly, spray and add to the water glass solution obtained in step (1), stir rapidly at a speed of 1300 rpm while spraying, and control the pH value to 1.5 Stop spraying, and the spraying time is controlled at...

Embodiment 2

[0057] Below in conjunction with embodiment, content of the present invention is described in detail:

[0058] (1) Prepare a mixed solution of silicon source and solvent

[0059] Take a water glass with a molar number of 3.2 and put it into a reaction kettle, dilute it with deionized water of 3 times the mass, stir at 200 rpm for 30 minutes, and filter through a 200-mesh sieve to obtain a water glass solution.

[0060] (2) Sol

[0061] Get 10mol / L nitric acid, add aluminum hydrochloride (aluminum hydrochloride is calculated as aluminum oxide, and the molar ratio of aluminum oxide and silicon oxide in the water glass solution is 2:100), lanthanum hydrochloride (lanthanum hydrochloride is calculated as lanthanum oxide, and The molar ratio of alumina is 3:100); after mixing evenly, spray and add to the water glass solution obtained in step (1), and stir rapidly at a speed of 1200 rpm while spraying, and control the pH value to 2.5 , the spraying time is controlled at 100 minute...

Embodiment 3

[0073] Below in conjunction with embodiment, content of the present invention is described in detail:

[0074] (1) Prepare a mixed solution of silicon source and solvent

[0075] Take water glass with a molar number of 4.0 and put it into a reaction kettle, dilute it with 3 times the mass of deionized water, stir at 80 rpm for 30 minutes, and filter through a 200-mesh sieve to obtain a water glass solution.

[0076] (2) Sol

[0077] Take 15mol / L nitric acid, add aluminum oxalate salt (calculated as alumina, the molar ratio to silicon oxide in the water glass solution is 3:100), lanthanum oxalate salt (calculated as lanthanum oxide, the molar ratio to alumina is 6: 100); after mixing evenly, spray and join the water glass solution that step (1) obtains, carry out rapid stirring with the speed of 1800 rev / mins while spraying, control pH value till 2.5, spray time is controlled at 100 minutes ; Get the sol.

[0078] (3) Gel

[0079] Add the sodium hydroxide solution with a pH...

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Abstract

The invention discloses a solid silica aerogel with a preparation method having the advantages of implementation in a normal-temperature and normal-pressure environment, short process time, suitableness for industrialization, and improvement of the toughness and the heatproof temperature of silica aerogel. A preparation method of rare earth toughened solid silica aerogel comprises the following steps: adding the prepared silica aerogel precursor (solid silica aerogel) into a drying kettle, filling the drying kettle with nitrogen to remove oxygen until the content of oxygen in the drying kettleis less than 3%, and then carrying out microwave vacuum drying on the material in the drying kettle to obtain the solid powdery silica aerogel. The solid silicon aerogel has an average pore size of 24-26 nm, a specific surface area of 558-588 m<2> / g and a loose specific weight of 0.057-0.061 g / cm, is superhydrophobic and flame retardant, and has a heat conductivity of 0.0196-0.021 W / M.K, a heatproof temperature of 725-920 DEG C and a compressive strength of 0.118-0.125 Mpa.

Description

[0001] This application is a divisional case of the Chinese invention patent with the patent application number 201610995966.2 (application date: November 12, 2016, patent name: a rare earth toughened silicon airgel precursor and a preparation process for solid silicon airgel) Apply. technical field [0002] The invention relates to the technical field of airgel, in particular to a solid silicon airgel. Background technique [0003] Silica airgel is a lightweight nanoporous material with controllable structure, which has many excellent properties, such as high porosity, high specific surface area, low density, low thermal conductivity, etc. [0004] The preparation of airgel usually consists of sol, gel process and supercritical drying process. In the process of sol and gel, by controlling the hydrolysis and polycondensation reaction conditions of the solution, nano-clusters of different structures are formed in the solution, and the mutual adhesion between the clusters for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01B33/16C01B33/157C01B33/143
CPCC01B33/143C01B33/157C01B33/1585C01B33/16C01P2006/12C01P2006/16C01P2006/21C01P2006/32
Inventor 郑善
Owner TIANJIN LANGHUA TECH DEV CO LTD
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