Fiber-reinforcement silicon dioxide aerogel continuous felt and preparation method thereof

A technology of airgel continuous felt and silica, which is applied in the field of airgel materials and its preparation, can solve the difficulty of meeting the needs of the preparation and use of general heat insulation materials, the inability to efficiently prepare airgel material continuous felt, Airgel is used as a material for high production costs to achieve the effect of preventing solid heat transfer and air convection heat transfer, low cost, and low thermal conductivity

Active Publication Date: 2012-10-03
海鹰空天材料研究院(苏州)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most airgel materials have low strength and high brittleness and are usually difficult to be directly applied in engineering. There are two methods to solve this problem. One is to add an adhesive to the prepared airgel powder and then secondary Forming method (Chinese patent 95197068.2); the second is to add reinforcing fibers in the sol-gel process to strengthen the airgel block (US patent US6068882)
At present, the methods involved in all patents are aimed at the preparation of airgel material powder and block, which cannot efficiently prepare airgel material continuous mats, and it is difficult to meet the needs of its engineering preparation and use as a general-purpose thermal insulation material
At the same time, due to the low preparation efficiency, the production cost of airgel as material is higher, which causes great difficulties for popularization and application.

Method used

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  • Fiber-reinforcement silicon dioxide aerogel continuous felt and preparation method thereof
  • Fiber-reinforcement silicon dioxide aerogel continuous felt and preparation method thereof
  • Fiber-reinforcement silicon dioxide aerogel continuous felt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] First, the ultra-fine glass wool continuous mat with a width of 0.8 meters, a width of 30 meters, and a density of 0.08 g / cubic centimeter (the fiber material involved in this article comes from Shandong Luyang Co., Ltd.) in the winding process equipment (see figure 1 ) into a winding unit, the gap between the continuous mats is 10mm; then tetraethyl orthosilicate, absolute ethanol, deionized water and ammonia water are prepared in a molar ratio of 1:1:2:0.0005 silica sol (all the chemical reagents involved in this article are the reagents produced by Beijing Chemical Reagent Factory, the same below); and then adopt the direct dipping method (that is, adding the silica sol into the container that is placed with the winding unit, relying on diffusion to realize Immersion of silica sol, hereinafter the same) The prepared silica sol is immersed in the coiling unit; then aged at room temperature for 24 hours; then 10% ethanol solution of hexamethyldisilazane is used for surf...

Embodiment 2

[0080] First, a continuous mat of ultra-fine glass wool with a width of 1.5 meters, a length of 30 meters and a density of 0.08 g / cubic centimeter is wound into a winding unit on the winding process equipment, and the gap between the continuous mats is 20 mm; Then prepare silica sol with tetraethyl orthosilicate, absolute ethanol, deionized water and ammonia water in a molar ratio of 1:20:15:0.1; then use the direct dipping method to immerse the prepared silica sol into the winding unit; then in Aging at room temperature for 48 hours; then use 50% hexamethyldisilazane ethanol solution for 0.5 hours of surface treatment; then put it into an autoclave, inject 16 MPa carbon dioxide gas, at 70 ° C at 2000 liters / hour The flow rate of the ethanol will bring the ethanol into the separation tank for separation. After the ethanol is completely separated, the pressure will be released slowly at a rate of 6 MPa / hour until it is balanced with the external atmospheric pressure. Finally, ...

Embodiment 3

[0082] Firstly, a continuous mat of ultra-fine glass wool with a width of 1.0 meters, a length of 20 meters and a density of 0.08 g / cubic centimeter is wound into a winding unit on the winding process equipment, and the gap between the continuous mats is 30mm ; Then prepare silica sol with tetraethyl orthosilicate, absolute ethanol, deionized water and ammonia in a molar ratio of 1:7:4:0.003; then use the direct dipping method to immerse the prepared silica sol into the winding unit; then Aging at room temperature for 24 hours; then use 10% hexamethyldisilazane ethanol solution to carry out surface treatment for 1 hour; The hourly flow rate brings ethanol into the separation tank for separation. After the ethanol is completely separated, the pressure is slowly released at a rate of 4 MPa / hour until it is balanced with the external atmospheric pressure. Finally, the winding unit is taken out and the obtained fiber reinforced The silica airgel continuous mat is removed from the ...

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Abstract

The invention provides a fiber-reinforcement silicon dioxide aerogel continuous felt which comprises silicon dioxide aerogel and reinforcing continuous fibers. The invention also provides a method for preparing the fiber-reinforcement silicon dioxide aerogel continuous felt, which comprises the following steps: rolling, preparation of silica sol, gum dipping, aging, surface treatment, drying of supercritical fluid, and the like. The method has the characteristics of simple technological process, low cost, high safety, high efficiency and the like. The aerogel continuous felt has the advantages of large specific surface area, favorable hydrophobicity, high mechanical strength, extremely low coefficient of heat conductivity, large size and the like, can meet serious requirements for heat protection in aviation, spaceflight, military affairs and civil affairs, and can be used in the fields of flame resistance, sound insulation and / or gas absorption, and the like.

Description

technical field [0001] The invention relates to an airgel material and a preparation method thereof, in particular to a fiber-reinforced airgel continuous mat and a preparation method thereof. Background technique [0002] Airgel is a low-density nanoporous amorphous material with a continuous random network structure. Due to the distribution of nanoscale particles and voids in airgel, it has very low thermal conductivity, so it can be used as a light-weight and efficient thermal insulation material (Angew Chem Int Ed. 1998, 37: 22-45). At the same time, due to the special structure of airgel, it also has many functions such as fire prevention, sound insulation, light transmission, adsorption, filtration, etc. It is precisely because of these characteristics that airgel materials are used in thermal, acoustic, optical, microelectronics, particle detection It has very broad application potential (Thin SolidFilms.1997, 297(1-2): 212-217). However, most airgel materials have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/38
CPCC04B30/02C04B2111/00025C04B2111/28C04B2103/0078C04B2111/27C04B2111/52C04B2111/00982
Inventor 张昊詹万初邹军锋张鹏张万强
Owner 海鹰空天材料研究院(苏州)有限责任公司
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