Sulfur-containing organic-inorganic hybrid gel compositions and aerogels

Patent metadata

Field	Value
Publication number	US-10577473-B2
Application number	US-201715623814-A
Country	US
Kind code	B2
Filing date	Jun 15, 2017
Priority date	Jun 30, 2011
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

Methods and materials are described for preparing organic-inorganic hybrid gel compositions where a sulfur-containing cross-linking agent covalently links the organic and inorganic components. The gel compositions are further dried to provide porous gel compositions and aerogels. The mechanical and thermal properties of the dried gel compositions are also disclosed.

First claim

The invention claimed is:

1. A dry gel composite comprising an organic polymer incorporated into a silica network, wherein the organic polymer is covalently bound to the silica network through a sulfur-containing cross linking agent.

2. The dry gel composite of claim 1 wherein the dry gel composite is an aerogel composite.

3. The dry gel composite of claim 1 or claim 2 , wherein the organic polymer is selected from the group consisting of unsaturated polyesters; prepolymers based on vinylesters, acrylates, methacrylates or polyurethanes; polybutadienes; styrene-butadiene copolymers; butadiene-isoprene co-polymers; butadiene-isoprene-styrene terpolymers; copolymers or terpolymers of isobutylene, para-methylstyrene and bromo-para-methyl-styrene; ethylene propylene diene monomer rubber; and a combination thereof.

4. The dry gel composite of claim 1 or claim 2 , wherein the organic polymer is in the form of latex particles or polymer resin.

5. The dry gel composite of claim 1 or claim 2 , wherein the sulfur-containing cross linking agent is a hexasulfide compound, a tetrasulfide compound, or a disulfide compound.

6. The dry gel composite of claim 1 or claim 2 , wherein the sulfur-containing cross linking agent is selected from the group consisting of polysulfide alkyl silanes, mercapto aryl silanes, polysulfide aryl silanes, silated core polysulfides, sulfur-containing silanes, sulfanylsilanes, sulfur-containing siloxanes, sulfur-functional polyorganosiloxanes, bis(triethoxysilylpropyl) tetrasulfide, 3-thiocyanatopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane and any combination thereof.

7. The dry gel composite of claim 1 or claim 2 , wherein the sulfur-containing cross linking agent is a sulfidosilane of a general formula
(R 1 —O) 3 —Si—R 2 —S x —R 2 —Si—(R 1 —O) 3

or of a general formula
HS—R 1 —Si—(O—R 2 ) 3

where R 1 and R 2 are same or different alkyl or aryl groups; and x is a number between 1 and 8.

8. The dry gel composite of claim 1 or claim 2 , wherein the organic polymer in the dry gel composite is present in an amount of up to 50 wt % based upon the weight of the dry gel composite.

9. The dry gel composite of claim 1 or claim 2 , wherein the sulfur-containing cross linking agent in the dry gel composite is present in an amount up to 50 wt % based upon the weight of the dry gel composite.

10. The dry gel composite of claim 1 or claim 2 , wherein the organic polymer in the dry gel composite is present in an amount of at least 3 wt % based upon the weight of the dry gel composite.

11. The dry gel composite of claim 1 or claim 2 , further comprising fibers in an amount of up to 75 wt % based upon the weight of the dry gel composite.

Assignees

• Aspen Aerogels Inc

Inventors

• Evans Owen R
• Dong Wenting
• Deshpande Kiranmayi

Classifications

• B01J13/0091

  Preparation of aerogels, e.g. xerogels · CPC title

• B01J13/0065

  containing an organic phase · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• C08C19/25 Primary

  Incorporating silicon atoms into the molecule · CPC title

• C08J9/0085

  Use of fibrous compounding ingredients (C08J9/0076 takes precedence) · CPC title