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Preparation method of foam ceramic composite SiO2 aerogel heat insulating material

A foamed ceramic and heat insulating material technology, which is applied in the field of nano-porous material preparation, can solve the problem that aerogel felt does not have compressive and flexural resistance, and achieves the elimination of gel, good heat insulation performance, and thermal conductivity. low rate effect

Inactive Publication Date: 2017-06-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the flexible SiO 2 Airgel felt still does not have the ability to resist compression and flexure, and cannot be directly used as a structural material in load-bearing structures

Method used

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  • Preparation method of foam ceramic composite SiO2 aerogel heat insulating material
  • Preparation method of foam ceramic composite SiO2 aerogel heat insulating material
  • Preparation method of foam ceramic composite SiO2 aerogel heat insulating material

Examples

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Effect test

example 1

[0028] Add 65.8ml tetraethyl orthosilicate, 185.5ml ethanol and 14.8ml deionized water into the beaker, adjust the pH value to about 4.5 with 1mol / L HCl solution, the dosage is 0.7ml. The mixed solution was heated to 55°C, and after stirring for 1h30min while maintaining the temperature, 6.8ml of 8.5mol / L aqueous ammonia solution was added to adjust the pH of the solution to 6.5. The porosity is 95%, the density is 0.28g / cm 3 The rigid foam ceramic material is placed in the mold, and the newly prepared SiO 2 The sol is poured into a container, subject to being submerged in the matrix material, shaken and stirred, so that the foam ceramic matrix is ​​fully infiltrated. No need to wait for its gel, directly put the sample and the container into the reaction kettle for ethanol supercritical drying. The drying temperature is set at 270°C. After the temperature rises, the pressure is maintained at 10MPa, maintained at constant temperature and pressure for 3 hours, and then maintai...

example 2

[0031] Add 92.8ml of silica sol, 130ml of ethanol and 12.1ml of deionized water into the beaker, and use 3.8mol / L of H 2 SO 4 The pH of the solution was adjusted to 3.5, and the dosage was 0.5 ml. The mixed solution was heated to 60° C., and after stirring for 0.5 h while maintaining the temperature, 13 mol / L ammonia water was added dropwise to adjust the pH of the solution to 7.5. The porosity is 85%, the density is 0.46g / cm 3 The rigid foam ceramic material is placed in the mold, and the newly prepared SiO 2 The sol is poured into a container, subject to being submerged in the matrix material, shaken and stirred, so that the foam ceramic matrix is ​​fully infiltrated. There is no need to wait for the gel, directly put the sample and the container into the reaction kettle for ethanol supercritical drying. The drying temperature is set at 260°C. After the temperature rises, the pressure is maintained at 12MPa, under constant temperature and pressure for 3.5 hours, and then ...

example 3

[0034] Add 60.8ml of tetraethylorthosilicate, 155.6ml of ethanol and 12.3ml of deionized water into the beaker, and use 2.5mol / L of HNO 3The pH of the solution was adjusted to 5, and the dosage was 1.2 ml. The mixed solution was heated to 50°C, and after stirring for 2 h while maintaining the temperature, 5 ml of 10 mol / L aqueous ammonia solution was added to adjust the pH of the solution to 7. The porosity is 68%, the density is 0.58g / cm 3 The rigid foam ceramic material is placed in the mold, and the newly prepared SiO 2 The sol is poured into a container, subject to being submerged in the matrix material, shaken and stirred, so that the foam ceramic matrix is ​​fully infiltrated. No need to wait for the gel, directly put the sample and the container into the reaction kettle for ethanol supercritical drying. The drying temperature is set at 280°C. After the temperature rises, the pressure is maintained at 11MPa, maintained at constant temperature and pressure for 4 hours, ...

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Abstract

The invention relates to a preparation method of a foam ceramic composite SiO2 aerogel heat insulating material. The preparation method comprises the following steps: taking tetraethyl orthosilicate and silica sol as precursors and carrying out acid and alkali two-step hydrolysis to form SiO2 sol; pouring the sol into matrix foam ceramic and sufficiently wetting the matrix foam ceramic; directly carrying out supercritical drying without two procedures of gelling and ageing. According to the preparation method, the foam ceramic is used as a matrix and the mechanical strength is greatly improved; the material can be subjected to post-period machining according to different utilization requirements and then is directly used as a bearing structure material. A silicon dioxide aerogel component is prepared by a rapid preparation method and an ageing process with the period of 2d to 4d is omitted, so that a lot of ethanol solvents are saved and the preparation time is greatly shortened. The prepared foam ceramic composite SiO2 aerogel material has the density of 0.42g / cm<2> to 0.86g / cm<2>, the compression strength of 0.5MPa to 2.4MPa and the room-temperature heat conductivity of 0.06W.m<-1>K<-1> to 0.25W.m<-1>K<-1>. The process has the advantages of simple materials and simple process; a preparation period is controlled within 6h and the preparation time is extremely shortened.

Description

technical field [0001] The invention belongs to the field of preparation technology of nanoporous materials, in particular to a foam ceramic composite SiO with high temperature resistance, low thermal conductivity and high strength. 2 A method for preparing an airgel heat insulating material. Background technique [0002] SiO 2 Airgel is a solid material with a three-dimensional nanoporous network structure. Due to its high specific surface area, high porosity, low density and low thermal conductivity, it is widely used in the field of thermal insulation. However, due to its high brittleness and low strength, it cannot be used directly as a thermal insulation material, which greatly limits its application in high-temperature industrial environments. At present, needle-punched felt is generally used to compound it to obtain fiber-reinforced flexible SiO 2 Airgel, which can be directly wrapped on the outside of high-temperature equipment, has strong tensile strength. But t...

Claims

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Application Information

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IPC IPC(8): C04B41/85
CPCC04B41/5089C04B41/85
Inventor 沈晓冬刘思佳崔升毛圣楠王谦
Owner NANJING UNIV OF TECH
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