Modified hybrid silica aerogels

Patent metadata

Field	Value
Publication number	US-2017074449-A1
Application number	US-201615341186-A
Country	US
Kind code	A1
Filing date	Nov 2, 2016
Priority date	Nov 30, 2010
Publication date	Mar 16, 2017
Grant date	—

Abstract

Disclosed and claimed herein are hybrid silica aerogels containing non-polymeric, functional organic materials covalently bonded at one or both ends to the silica network of the aerogels through a C—Si bond between a carbon atom of the organic material and a silicon atom of the aerogel network. Methods of their preparation are also disclosed.

First claim

What is claimed is:

1 ) An aerogel composition comprising a silica-based network and a non-polymeric organic material covalently bonded to the silica-based network.

2 ) The aerogel composition of claim 1 , wherein the non-polymeric organic material is covalently bonded to the silica-based network through a C—Si bond between a carbon atom of the organic material and a silicon atom of the network

3 ) The aerogel composition of claim 2 , wherein the non-polymeric organic material comprises branched or unbranched alkyl chains of C1-C40 with at least one of OH, NHR, SH, OH-terminated alkoxy, carboxy, phenolic groups are attached to the chain, and wherein a heteroatom may optionally be a part of the chain.

4 ) The aerogel composition of claim 2 , wherein the non-polymeric organic material is a reaction product of a glycidyloxyalkyl-trialkoxysilane and an aminoalkyl-trialkoxysilane.

5 ) The aerogel composition of claim 4 , wherein the glycidoalkyl-trialkoxysilane is 3-glycidopropyl-trialkoxysilane; and the aminoalkyl-trialkoxysilane is 3-aminopropyl trialkoxysilane.

6 ) The aerogel composition of claim 2 , wherein the non-polymeric organic material is a reaction product of an alkyldiol diglycidyl ether and aminoalkyl-trialkoxysilanes.

7 ) The aerogel composition of claim 6 , wherein the alkyldiol diglycidyl ether is butanediol diglycidyl ether; and the aminoalkyl-trialkoxysilanes are 3-aminopropyl trialkoxysilanes.

8 ) The aerogel composition of claim 2 , wherein the composition further comprises a reinforcement material.

9 ) The aerogel composition of claim 8 , wherein the reinforcement material is a fiber reinforcement material.

10 ) A method of preparing an aerogel compositions comprising the steps of:
a. forming a pre-gel mixture by combining a solvent, at least one partially or fully hydrolyzed tetraalkoxysilane, and at least one trialkoxysilane covalently bonded to a non-polymeric organic material; b. allowing the pre-gel mixture to form a gel; and c. drying the gel to obtain an aerogel.

11 ) The method of claim 10 , wherein the non-polymeric organic material comprises branched or unbranched alkyl chains of C1-C40 with at least one of OH, NHR, SH, OH-terminated alkoxy, carboxy, phenolic groups are attached to the chain, and wherein a heteroatom may optionally be a part of the chain.

12 ) The method of claim 10 , wherein the non-polymeric organic material is a reaction product of a glycidyloxyalkyl-trialkoxysilane and an aminoalkyl-trialkoxysilane.

13 ) The method of claim 12 , wherein the glycidoalkyl-trialkoxysilane is 3-glycidopropyl-trialkoxysilane; and the aminoalkyl-trialkoxysilane is 3-aminopropyl trialkoxysilane.

14 ) The method of claim 10 , wherein the non-polymeric organic material is a reaction product of an alkyldiol diglycidyl ether and aminoalkyl-trialkoxysilanes.

15 ) The method of claim 14 , wherein the alkyldiol diglycidyl ether is butanediol diglycidyl ether; and the aminoalkyl-trialkoxysilanes are 3-aminopropyl trialkoxysilanes.

16 ) The method of claim 11 , wherein the tetraalkoxysilane comprises between about 10 and about 75% of hydrolysed siloxane.

17 ) The method of claim 10 , further comprising the step of adding a reinforcement material to the pre-gel mixture.

18 ) The method of claim 17 , wherein the reinforcement material is a fiber reinforcement material.

19 ) The method of claim 10 , wherein the gel is dried using a supercritical fluid.

Assignees

• Aspen Aerogels Inc

Inventors

• Rhine Wendell E
• Coutinho Decio
• Deshpande Kiranmayi

Classifications

• C08J2383/04

  Polysiloxanes · CPC title

• C01B33/155

  Preparation of hydroorganogels or organogels · CPC title

• C01B33/1585 Primary

  Dehydration into aerogels · CPC title

• C08J9/286

  the liquid phase being a solvent for the monomers but not for the resulting macromolecular composition, i.e. macroporous or macroreticular polymers · CPC title

• C01B33/145

  Preparation of hydroorganosols, organosols or dispersions in an organic medium · CPC title