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Preparation method of glass fiber reinforced tio2-sio2 composite airgel thermal insulation material

A technology of composite airgel and glass fiber, applied in the direction of silica, silicon oxide, etc., to achieve the effects of low production cost, fast installation and convenient construction

Active Publication Date: 2016-08-31
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to SiO 2 The special optical properties of airgel make it greatly affected by radiation heat conduction at high temperature

Method used

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  • Preparation method of glass fiber reinforced tio2-sio2 composite airgel thermal insulation material
  • Preparation method of glass fiber reinforced tio2-sio2 composite airgel thermal insulation material
  • Preparation method of glass fiber reinforced tio2-sio2 composite airgel thermal insulation material

Examples

Experimental program
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Effect test

example 1

[0028] Example 1 Mix the alkaline silica sol with a pH value of 8 and a solid content of 30.2 and absolute ethanol at a volume ratio of 1:0.5. Under stirring, press SiO 2 :TiO 2 (Mass ratio) = 10:0.1 Add rutile titanium dioxide to SiO 2 In the sol, add 2mol / L sulfuric acid to adjust the pH value of the solution to 6.1, and keep stirring to obtain TiO 2 -SiO 2 Composite sol, the TiO 2 -SiO 2 The composite sol is poured into the mold of the glass fiber prefabricated part. After the sol is soaked into the glass fiber, the excess sol is poured out, and the sol composite material is left at 50°C for 2 hours to form a gel composite material. At 50°C, solvent replacement was performed with absolute ethanol solution for 2 days, and the surface of the gel composite was modified with trimethylchlorosilane for 2 days to obtain a hydrophobic surface, and then solvent replacement was performed with absolute ethanol solution, Substituted for 2 days to obtain a gel composite material wi...

example 3

[0030] Example 3 Mix the alkaline silica sol with a pH value of 9.5 and a solid content of 31.3, and absolute ethanol at a volume ratio of 1:1.5, and in a stirring state, press SiO 2 :TiO 2 (Mass ratio) = 10:0.25 Add rutile titanium dioxide to SiO 2 In the sol, add 3.2mol / L hydrochloric acid to adjust the pH value of the solution to 6.6, and keep stirring to obtain TiO 2 -SiO 2 Composite sol, the TiO 2 -SiO 2 The composite sol is poured into the mold of the glass fiber prefabricated part. After the sol is soaked into the glass fiber, the excess sol is poured out, and the sol composite material is left at 65°C for 8 hours to form a gel composite material. The obtained gel composite material is At 70°C, solvent replacement was carried out with absolute ethanol solution for 3.5 days, and the gel composite was surface-modified with hexamethyldisiloxane for 3.5 days to obtain a hydrophobic surface, and solvent replacement was performed with absolute ethanol solution Replacemen...

example 4

[0032] Example 4 Mix the alkaline silica sol with a pH value of 10 and a solid content of 31.8 and absolute ethanol at a volume ratio of 1:2. 2 :TiO 2 (Mass ratio) = 10:0.3 Add anatase titanium dioxide to SiO 2 In the sol, add 4mol / L hydrochloric acid to adjust the pH value of the solution to 7, and keep stirring to obtain TiO 2 -SiO 2 Composite sol, the TiO 2 -SiO 2 The composite sol is poured into the mold of the glass fiber prefabricated part. After the sol is soaked into the glass fiber, the excess sol is poured out, and the sol composite material is left at 70°C for 11 hours to form a gel composite material. Solvent replacement with absolute ethanol solution at 80°C for 4 days, surface modification of the gel composite with hexamethyldisiloxane for 4 days to obtain a hydrophobic surface, and solvent replacement with absolute ethanol solution Replacement, replacement for 4 days, to obtain a gel composite material with a hydrophobic surface, the obtained gel composite ...

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Abstract

The invention provides a preparation method of a fiber-glass-reinforced TiO2-SiO2 composite aerogel heat-barrier material. The method comprises the following steps: preparing titanium-silicon composite sol seeping glass fiber felt from silica sol and titanium white, standing to solidify, and carrying out solvent replacement, surface modification, drying and the like to obtain the fiber-glass-reinforced TiO2-SiO2 composite aerogel heat-barrier material. The material has the advantages of simple technique and low cost, can implement continuous production, and has favorable industrial production application prospects.

Description

technical field [0001] The invention belongs to the technical field of heat insulation materials, in particular to a glass fiber reinforced TiO 2 -SiO 2 The invention discloses a preparation method of a composite airgel heat insulating material. Background technique [0002] Airgel is a nanoporous network solid amorphous material composed of colloidal particles or polymer molecules, with a porosity of 80-99.8% and a specific surface area of ​​800-1000m 2 / g or more. Airgel has a very low density. Researchers led by Larry Hrubesh in the United States have prepared a density of only 0.003g / cm 3 The airgel, which is only three times as dense as air, is called "solid smoke." The average pore size of airgel is 2-50nm, which is a typical mesoporous material and meets the pore structure requirements of super thermal insulation materials. The commonly used SiO 2 Airgel insulation materials fully possess the characteristics of typical super insulation materials, and the temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/14
CPCC04B30/02
Inventor 崔升周游沈晓冬刘思佳
Owner NANJING TECH UNIV
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