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Transparent assemblies with ormosil aerogels

a technology of ormosil and aerogel, which is applied in the direction of solar radiation prevention, instrumentation, thermal insulation, etc., can solve the problems of inability to produce transparent aerogel composites, collapse of filigranes, and inability to use the mixture generally used to prepare xerogel to prepare aerogels. , to achieve the effect of improving various physical and mechanical properties

Inactive Publication Date: 2006-11-02
ASPEN AEROGELS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides methods for producing solvent-filled, nanostructured gel monoliths and flexible blanket composite sheets using fiber reinforcement. The invention involves incorporating a mobile phase solvent extraction process using hypercritical fluid drying. The resulting aerogel monoliths are stronger and more compliant than traditional silica aerogels. The invention also provides a method for co-condensing trialkoxysilyl end capped linear polymers with silica precursors to create flexible composite materials. The resulting aerogel composite materials have improved handling and reduced dustiness. The invention also includes a method for making a linear polymer bonded ormosil fiber reinforced flexible composite. Overall, the invention provides improved mechanical properties and flexibility in aerogel materials.

Problems solved by technology

Yet it is inherently impossible to produce transparent aerogel composite, due to the presence of macro scale phase separation in these materials.
This results in the collapse of the filigrane, the highly porous inorganic network of the wet gels.
Stated differently, the solutions or mixtures generally used to prepare a xerogel cannot be used to prepare an aerogel simply by altering the drying conditions because the resultant product will not automatically have a density of an aerogel.

Method used

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  • Transparent assemblies with ormosil aerogels
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  • Transparent assemblies with ormosil aerogels

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065] This example illustrates the formation of a triethoxysilyl terminated polyether. 46.0 g of 3-isocyanatopropyltriethoxysilane was added to a mixture of 400 g of amine-10 terminated polyoxypropylene diols (Jeffamine®XTJ510, Mw=4000, commercially available from Hutsman corporation) and 400 ml of anhydrous THF, following by vigorous stirring at ambient temperature. The completion of this reaction can be monitored by IR spectroscopy. It was observed that the strong and narrow band at 2274 cm−1 assigned to the vibration of isocyanate group of the to 3-isocyanatopropyltriethoxysilane disappeared at the end of the reaction (approx 1 hour). Example 1 serves as an exemplar for the source of the linear polymer.

example 2

[0066] This example illustrates the formation of a triethoxysilyl terminated 20 polyoxypropylene. 49.47 g of 3-isocyanatopropyltriethoxysilane (Aldrich) was added to a mixture of 200 g of amine-terminated polyoxypropylene diols (Jeffamine® D2000, Mw=2000, commercially available from Hutsman corporation) and 200 ml of anhydrous THF, following by vigorous stirring at ambient temperature. The completion of this reaction can be monitored by IR spectroscopy. It was observed that the strong and narrow band at 2274 cm−1 assigned to the vibration of isocyanate group of the to 3-isocyanatopropyltriethoxysilane disappeared at the end of the reaction (less than 0.5 hour). Example 2 serves as an exemplar for the source of the linear polymer.

example 3

[0067] This example illustrates the formation of a polyoxypropylene modified silica aerogel monolith with 5 wt % loadings of polyoxypropylene (Mw2000). 25 g of water were added to a mixture of 52.7 g tetramethylorthosilicate (TMOS), 1.7 g of the polymer from Example 2 and 350 ml of methanol, following by 1 hour mixing at ambient temperature. The combination was gelled by addition of 0.6 g formamide and 6.0 g ammonia methanol solution (15.4 wt % ammonia). The resultant gels were first aged in ammonia ethanol solution (4.85 wt %) at ambient temperature, followed by aging in hexamethyldisilazane (5% v / v) solution for 3 days at ambient temperature. The gels remained highly transparent after CO2 supercritical extraction. The average thermal conductivity of the resultant aerogel monoliths was 13.1 mW / m·K under ambient conditions, and the average density of these monoliths was 0.07 g / cm3.

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Abstract

The invention provides reinforced aerogel monoliths as well as fiber reinforced composites thereof for a variety of uses. Compositions and methods of preparing the monoliths and composites are also provided. Application of these materials in transparent assemblies is also discussed.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application is a continuation-in-part of U.S. Utility patent application Ser. No. 11 / 030,395 and claims benefit of priority from U.S. Provisional Patent Applications 60 / 594,165 (filed on Mar. 15, 2005) and 60 / 739,748 (filed on Nov. 23, 2005), both which are hereby incorporated in its entirety as if fully set forth.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] This invention was partially made with Government support under Contract DE-FC26-03NT41950 awarded by the Department of Energy (DOE.) The Government may have certain rights in parts of this invention.FIELD OF THE INVENTION [0003] The inventions described herein relate to producing solvent filled, nanostructured gel monolith and flexible blanket composite sheet materials. These materials become nanoporous aerogel bodies after all mobile phase solvents are extracted via a process such as hypercritical solvent extraction (supercritical fluid drying). For...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D04H1/00
CPCB01J13/0091F24J2/515Y02E10/40G02B2207/109G02B2207/107F24S80/65F24S80/56Y10T442/699
Inventor RHINE, WENDELL E.GOULD, GEORGE L.BEGAG, REDOUANESONN, JONG HOOU, DUAN LI
Owner ASPEN AEROGELS INC
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