Preparation method of fiber felt enhanced silica aerogel composite panel

A technology of silica and fiber felt, which is applied in the field of fire prevention, sound insulation materials, oil pollution adsorption, and building thermal insulation. The effect of low strength and equipment requirements

Active Publication Date: 2015-04-01
中知在线股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When silica airgel is dry, its pores will be destroyed due to capillary force, and its structure will collapse.
However, tetraethyl orthosilicate is toxic and expensive, and silicon alkoxide is not suitable for industrial production as a silicon source.
[0006] Ryu et al. use glass fiber composite silica gel, but the mechanical strength is relatively poor; Wang Hong et al. use glass fiber felt, rock wool felt and other inorganic fiber mats composited with

Method used

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  • Preparation method of fiber felt enhanced silica aerogel composite panel
  • Preparation method of fiber felt enhanced silica aerogel composite panel

Examples

Experimental program
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Effect test

example 1

[0032] The water glass (modulus: 3.1 Baume 40), absolute ethanol, deionized water, and hydrofluoric acid are uniformly mixed and reacted at a volume ratio of 1:2:6:0.03 for 5 hours to obtain a silicone gel. The silicone gel is immersed in the trimethylchlorosilane / n-hexane solution, the volume ratio of the trimethylchlorosilane, n-hexane and the silicone gel is 1:5:10, and it is modified at room temperature for 24h. The modified gel is dried and pulverized to obtain hydrophobic silica aerogel particles with an average particle diameter of 0.2 mm. Take the silica aerogel particles, EVA powder and n-hexane solution in a volume ratio of 1:0.05:10 to blend into a mixed solution. After stirring at 1200R / min for 0.1h, immerse the glass fiber mat in the mixed solution. The volume ratio of the glass fiber mat to the mixed solution is 1:5, while performing ultrasonic dispersion at a frequency of 60KHZ, take it out after 0.3h, and heat-press at 120℃, 0.2MP for 15min, cool to room tempera...

example 2

[0034] Mix water glass (modulus of 2.5 Baume 39), absolute ethanol, deionized water, and hydrofluoric acid in a volume ratio of 1:4:3:0.07 at room temperature for 8 hours, trimethylchlorosilane, n-hexane and The volume ratio of silica gel is 1:10:15, and the volume ratio of silica aerogel particles, EVA powder and n-hexane solution is 1:0.15:15. Alumina fiber felt is used as a reinforcing matrix. Alumina fiber felt The volume ratio to the mixed solution is 1:5, 80HZ ultrasonic dispersion for 40min, and hot pressing for 50min under the conditions of 80℃ and 1MP. Other conditions were the same as in Example 1, and a composite board of silica aerogel and alumina fiber felt was prepared.

example 3

[0036] Mix water glass (modulus of 3.4 Baume 46), absolute ethanol, deionized water, and hydrofluoric acid in a volume ratio of 1:3.5:5:0.05 at room temperature for 6h, and use hexamethyldisilane / n-hexane Alkane is used as the modifier, and the volume ratio of hexamethyldisilane, n-hexane and silica gel is 1:5:15. The silica aerogel prepared by the modification at room temperature for 48 hours is dried under normal pressure and crushed. Prepare silica aerogel powder with an average particle size of 0.25mm, blend the silica aerogel particles, EAA powder and n-hexane solution in a volume ratio of 1:0.1:15, and stir at a high speed of 2000R / min for 0.1h Then, immerse the boron oxide fiber felt in the mixed solution, the volume ratio of the boron oxide fiber felt to the mixed solution is 1:3, and perform ultrasonic dispersion at a frequency of 40KHZ, take it out after 1h, and heat press for 30min at 80℃ and 0.7MP. , Cooling to normal temperature and maintaining the pressure for 12 ...

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Abstract

The invention discloses a preparation method of a fiber felt enhanced silica aerogel composite panel. The method comprises the following steps: with industrial-grade water glass as a silicon source, carrying out alkylation on a silica gel surface with a silane modifier, and drying at ordinary pressure, so as to prepare silicon dioxide aerogel particles; mixing and doping the prepared silica aerogel powder with hot melt adhesive powder in a fiber felt at the ratio, and carrying out thermo-compression formation, so as to prepare the silica aerogel composite panel, wherein the mass content of aerogel is 39%-61%; the density of the composite panel is 98-260kg/m<2>; the compressive strength can be up to 2.9-3.7MPa; the breaking strength is 1.9-3.3MPa; the heat conductivity coefficient is less than 0.023-0.035W/(m.K); and the hydrophobic angle reaches 129-153 DEG. The preparation method is low in silicon source cost, simple in synthetic process, and low in equipment demands; the prepared silica aerogel composite panel does not come off; and the fiber felt enhanced silica aerogel composite panel has self-supporting ability, and can be applied to the fields of heat preservation, heat insulation, fire protection, sound isolation, oil absorption and the like.

Description

Technical field [0001] The invention belongs to the technical fields of building thermal insulation, fire protection, sound insulation materials and oil pollution absorption, and specifically relates to a method for preparing a silica aerogel composite board. Background technique [0002] Silica aerogel is a light porous amorphous inorganic polymer material with a continuous three-dimensional network structure composed of nano-scale pores with a volume fraction of more than 90% and a silica skeleton with a volume fraction of less than 10%. Its unique structural characteristics make silica aerogel have the advantages of low density, high porosity, large specific surface area, and extremely low thermal conductivity. Silica aerogel has broad application prospects in the fields of energy, chemical metallurgy, building energy conservation and aerospace. [0003] When silica aerogel is dried, its pores will be destroyed and the structure will collapse due to capillary force. The tradit...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B14/38
Inventor 许鑫华朱进姜安妮范欣
Owner 中知在线股份有限公司
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