Heat insulation material based on aerogel

Patent metadata

Field	Value
Publication number	US-10035122-B2
Application number	US-201515506361-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Aug 28, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A heat insulation material is provided that is produced by drying a fibrous matrix impregnated with a solution of pseudo-peptides of formula (I), wherein: R is a side-chain of a natural or synthetic amino acid, R1 is either a linear or branched (C 1 -C 3 )alkyl group, or a linear or branched (C 1 -C 3 )alcoxy group, or an aryl group, or an aryl(C 1 -C 3 )alkyl group, or an aryloxy group, or a saturated or unsaturated heterocycle, n=1 or 2, and A is an aromatic or heteroaromatic group with at least one cycle.

First claim

The invention claimed is:

1. A thermal insulating material obtained by drying a fibrous matrix impregnated with a solution of pseudopeptides of formula (I),

in which
R represents a side chain of a natural amino acid;
R 1 represents either a linear or branched (C 1 -C 8 )alkyl group, or a linear or branched (C 1 -C 8 )alkoxy group, or an aryl group, or an aryl(C 1 -C 4 )alkyl group, or an aryloxy group, or a saturated or unsaturated heterocycle, or PhCH 2 O— or CH 2 ═CH—CH 2 O—, n=1 or 2; and
A represents an aromatic or heteroaromatic group with one or more rings,

said fibrous matrix having a thermal conductivity of less than 0.05 W/m/K and a density of less than 50 kg/m 3 .

2. The thermal insulating material according to claim 1 , characterized in that the pseudopeptide of formula (I) is selected from those in which the group

represents either a group

or a group

3. The thermal insulating material according to claim 1 , characterized in that the pseudopeptide of formula (I) is selected from those in which R represents either —CH 2 Ph, or —C(CH 3 ) 3 or —CH(CH 3 ) 2 and R 1 represents either PhCH 2 O— or CH 2 ═CH—CH 2 O—.

4. The thermal insulating material according to claim 1 , characterized in that said fibrous matrix is a matrix of plant, animal, mineral origin, of natural or synthetic polymers, or any combination thereof.

5. The thermal insulating material according to claim 4 , characterized in that said matrix is selected from the group consisting of a fibreboard, a blanket of wood fibres, a cotton, wool, mineral wool, polystyrene, polyurethane, polyisocyanate and polyisocyanurate matrix.

6. The thermal insulating material according to claim 1 , characterized in that said material is obtained by drying a fibreboard impregnated with a solution of pseudopeptide of formula (Ia) or a blanket of wood fibres impregnated with a solution of pseudopeptide of formula (Ia)

7. A method for preparing a thermal insulating material according to claim 1 , wherein said method comprises the following stages:
(i) preparing a liquid solution of pseudopeptides of formula (I), in a solvent;
(ii) bringing a matrix as described according to claim 1 into contact with the solution obtained in stage (i) until said matrix is completely impregnated with said solution and reaches its maximum capacity for absorbing said solution;
(iii) forming an organogel/matrix complex by cooling; and
(iv) extracting the solvent contained in said organogel/matrix complex in order to obtain the aforesaid thermal insulating material.

8. A thermal insulating material obtained by the method according to claim 7 .

9. The method according to claim 7 , wherein step (i) is performed by preparing a liquid solution of pseudopeptide of formula (Ia)

10. A method for improving the hydrophobicity of a fibrous matrix, said method comprising the following step:
applying to said fibrous matrix a solution of pseudopeptides of formula (I):

in which
R represents a side chain of a natural amino acid;
R 1 represents either a linear or branched (C 1 -C 8 )alkyl group, or a linear or branched (C 1 -C 8 )alkoxy group, or an aryl group, or an aryl(C 1 -C 4 )alkyl group, or an aryloxy group, or a saturated or unsaturated heterocycle, or PhCH 2 O— or CH 2 ═CH—CH 2 O—, n=1 or 2; and
A represents an aromatic or heteroaromatic group with one or more rings,

said fibrous matrix having a thermal conductivity of less than 0.05 W/m/K and a density of less than 50 kg/m 3 .

11. The method of claim 10 , wherein the pseudopeptide of formula (I) is selected from those in which the group

represents either a group

or a group

12. The method of claim 10 , characterized in that the pseudopeptide of formula (I) is selected from those in which R represents either —CH 2 Ph, or —C(CH 3 ) 3 or —CH(CH 3 ) 2 and R 1 represents either PhCH 2 O— or CH 2 ═CH—CH 2 O—.

13. The method of claim 10 , where the solution of pseudopeptides of formula (I) is a solution of (Ia)

Assignees

• Univ De Lorraine
• Centre Nat Rech Scient

Inventors

• Jamart Brigitte
• Degiovanni Alain
• Son Sébastien
• Jannot Yves
• Pickaert Guillaume

Classifications

• F26B21/40

  using gases other than air · CPC title

• E04B2001/742

  Use of special materials; Materials having special structures or shape · CPC title

• B27K3/0278

  involving an additional treatment during or after impregnation · CPC title

• B27K2240/70

  Hydrophobation treatment · CPC title

• D06M13/35

  Heterocyclic compounds · CPC title