Process for producing isocyanate-based xerogels and aerogels with mineral acids

Patent metadata

Field	Value
Publication number	US-10759893-B2
Application number	US-201615767710-A
Country	US
Kind code	B2
Filing date	Oct 11, 2016
Priority date	Oct 16, 2015
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

The present invention is directed to a process for preparing a porous material, at least compris-ing the steps of providing a mixture (I) comprising a composition (A) at least comprising at least one polyfunctional isocyanate as component (ai) and at least one mineral acid (aa), and a sol-vent (B), reacting the components in the composition (A) obtaining an organic gel, and drying of the gel obtained. The invention further relates to the porous materials which can be obtained in this way and the use of the porous materials as thermal insulation material and as catalysts.

First claim

The invention claimed is:

1. A process for preparing a porous material, comprising:
a) providing a mixture (I) comprising
(i) a composition (A) comprising
at least one polyfunctional isocyanate as component (ai), and
at least one mineral acid (aa) and

(ii) a solvent (B),

b) reacting the components in the composition (A) to obtain an organic gel, and
c) drying the obtained gel,
wherein the mineral acid (aa) is selected from the group consisting of mineral oxo-acids comprising sulphur, boron, nitrogen, phosphorus, silicon, chlorine, bromine, iodine, fluorine, chromium, vanadium, manganese, rhenium, technetium, arsenic, selenium and tellurium.

2. The process according to claim 1 , wherein the composition (A) comprises
amines in an amount in a range of from 0 to 2 wt. %,
alcohols in an amount in a range of from 0 to 20 wt. %, and
water in an amount in a range of from 0 to 1 wt. %.

3. The process according to claim 1 , wherein the polyfunctional isocyanate is selected from the group consisting of aromatic, aliphatic, cycloaliphatic and araliphatic isocyanates.

4. The process according to claim 1 , wherein the composition (A) comprises the component (ai) in an amount in a range from 40 to 99 mol %.

5. The process according to claim 1 , wherein the composition (A) comprises the mineral acid (aa) in an amount in a range of from 60 to 1 mol %.

6. The process according to claim 1 , wherein the solvent (B) is replaced by a solvent (S) after the organic gel is obtained and before drying of the gel in c).

7. The process according to claim 1 , wherein the drying in c) comprises converting a liquid in the gel into a gaseous state at a temperature and a pressure below a critical temperature and a critical pressure of the liquid in the gel.

8. A porous material, which is obtained by the process according to claim 1 .

9. A thermal insulation material comprising the porous material of claim 8 .

10. The porous materials according to claim 8 , wherein the porous material is a catalyst.

Assignees

• Basf Se
• Univ Missouri

Inventors

• Loelsberg Wibke
• Fricke Marc
• Weinrich Dirk
• Leventis Nicholas
• Sotiriou-Leventis Chariklia
• Saeed Adnan M

Classifications

• C08K3/24

  Acids; Salts thereof {(C08K3/16 takes precedence)} · CPC title

• C08G18/703

  Isocyanates or isothiocyanates transformed in a latent form by physical means · CPC title

• C08G2110/0091

  Aerogels; Xerogels · CPC title

• C08G18/7664

  containing alkylene polyphenyl groups · CPC title

• C08G18/0852

  the solvents being organic · CPC title