An improved process for producing silica aerogel thermal insulation product with increased efficiency

A technology of silica and production process, which is applied in the direction of airgel preparation, layered products, and protection of pipelines through heat insulation

Inactive Publication Date: 2018-03-27
M S INT ADVANCED RES CENT FOR POWDER METALLURGY & NEW METERIALS ARCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above mentioned patents disclose any superficial nanoporous area of ​​the aerogels formed by the respective methods

Method used

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  • An improved process for producing silica aerogel thermal insulation product with increased efficiency
  • An improved process for producing silica aerogel thermal insulation product with increased efficiency
  • An improved process for producing silica aerogel thermal insulation product with increased efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] In the first step, weigh 412 milliliters of ethanol, 385 milliliters of distilled water, 16.5 milliliters of ammonium fluoride (0.5M) and 1.65 milliliters of ammonia solution, and pour them into a stirring flat round bottom flask. Dilute 2.75 ml of titanium isopropoxide into 165 ml of ethanol, and slowly add the dilution to the above mixture. While stirring, 275 ml of tetraethoxysilicate and 110 ml of methyltrimethoxysilane were added to the above mixture. The resulting sol was transferred to a plastic container, which converted to a gel within 5-7 minutes. Store shaped gels at room temperature for 1 day to strengthen the gel network. Finally, the gel was removed from the plastic container and immersed in ethanol for 3 days in order to replace the liquid and by-products in the gel. The stock ethanol was replaced daily with fresh batches of ethanol. Then, the gel is placed in a high-pressure reactor for high-temperature supercritical drying. Reactor temperature and p...

Embodiment 2

[0109] In the first step, weigh 375 milliliters of ethanol, 350 milliliters of distilled water, 25 milliliters of ammonium fluoride (0.5M) and 1.5 milliliters of ammonia solution in a stirring beaker. Dilute 5 ml of titanium isopropoxide into 150 ml of ethanol, and slowly add the resulting dilution to the above mixture. While stirring, 250 ml of tetraethoxysilicate and 100 ml of methyltrimethoxysilane were added to the mixture. This sol was soaked on a 10 mm thick ceramic fiber nonwoven cloth with a size of 30 cm x 30 cm. Within 5-10 minutes, the sol soaked in the fiber blanket solidifies. The resulting composite gel can be aged in a sealed plastic container to allow the gel network to remain at room temperature for 1 day. Finally, the composite gel was taken out of the plastic container and immersed in ethanol for 3 days to replace the liquid and by-products in the gel. The stock ethanol was replaced daily with fresh batches of ethanol. Then, the gel is placed in a high-p...

Embodiment 3

[0111] According to the silica airgel prepared by the steps described in Example 2, in addition to 5 milliliters of titanium isopropoxide, 0.5 milliliters was added to the final product so that there was about 0.1% titanium dioxide in the final product. In another experiment, no titanium isopropoxide was added in order to obtain a pure silicon aerosol flexible sheet sample without addition of titanium dioxide. Samples with 0.1% titanium dioxide and samples without titanium dioxide were tested for reflectance of infrared radiation by heating to 400° C. in air. Figure 4 It was shown that due to the presence of titanium dioxide (titanium dioxide concentration ≤ 1% compared to samples without titanium dioxide), the infrared reflectivity in the wavelength range of 3nm-7pm was increased.

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Abstract

The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was achieved by in-situ production of titanium dioxide nanoparticles in very minor concentrations during gelation of silica precursor, with nanoporous surface area more than 300 m<2> / g and acts as an infra red reflecting agent. When aerogel is subjected to heat during hot object insulation, it automatically turns into infra redreflecting material. Said silica aerogel can be incorporated into the inorganic fibre mat matrix individually or into two or more layers with organic sponge sheet placed in between and stitched together to form a sandwich sheet to form highly insulating flexible sheet.

Description

technical field [0001] The present invention relates to an improved process for the production of silica aerogels in pure and flexible sheet form with enhanced inhibition of radiative heat transfer at high temperatures and enhanced insulation thermal nature. More specifically, it relates to a method for producing a silica airgel insulation product having metal oxide nanoparticles formed in situ in the silica airgel. A new approach is taken to achieve radiative heat transfer at high temperatures using small fractions of infrared sunscreen materials. The silicon dioxide airgel flexible sheet product prepared by the method of the present invention has a higher silica airgel content than sheets prepared by known methods. The sheet can exhibit higher heat insulating properties. Background technique [0002] Aerogels are known to be ultra-low density, nanoporous, man-made materials that uniquely combine the capabilities of sound, electricity, and heat insulation. There are a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/413B01J13/00B32B5/22B32B5/24B32B5/26C04B30/02C04B14/06D04H1/4209D04H1/4218D04H1/4374E04B1/76E04B1/78
CPCB32B5/26D04H1/413D04H1/4209D04H1/4218D04H1/4374B32B2264/102B32B2307/30B32B2307/304B32B5/022B32B5/024B32B5/06B32B5/245B32B2260/021B32B2260/04B32B2262/10B32B2262/101B32B2262/105B32B2266/0235B32B2266/025B32B2266/0278B32B2307/416B32B2307/546B01J13/0091C04B2111/00008C04B2111/28C04B35/14C04B38/00C04B2235/3272C04B2235/3262C04B2235/3206C04B2235/3244C04B2235/3284C04B2235/3241C04B2235/3275C04B2235/3232C04B2235/3293C04B2235/3286C04B2235/441C04B2235/3201C04B35/624C04B2235/606C04B35/82C04B35/80C04B2235/522C04B2235/6023C04B35/62655C04B38/0045C04B2111/40Y02A30/24Y02B80/10C04B38/0054B32B2266/02C04B2235/32C04B35/62635C04B35/62878C04B2235/3418C04B2235/483C04B2235/5216C04B2235/5454C04B2235/616C04B2235/9607E04B1/80F16L59/026
Inventor 赫巴卡·尼哈·耶实瓦塔
Owner M S INT ADVANCED RES CENT FOR POWDER METALLURGY & NEW METERIALS ARCI
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