Process for producing porous materials

Patent metadata

Field	Value
Publication number	US-10954353-B2
Application number	US-201515128299-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Mar 24, 2014
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

The present invention relates to a process for preparing a porous material, at least comprising the steps of providing a mixture (I) comprising a composition (A) comprising components suitable to form an organic gel and a solvent (B), reacting the components in the composition (A) in the presence of the solvent (B) to form a gel, and drying of the gel obtained in step b), wherein the composition (A) comprises at least one monool (am). 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 in vacuum insulation panels, in particular in interior or exterior thermal insulation systems.

First claim

The invention claimed is:

1. A process for preparing a porous material, the process comprising:
a) providing a mixture (I) comprising
(i) a composition (A) comprising components suitable to form an organic gel and
(ii) a solvent (B);
b) reacting the components in the composition (A) to obtain an organic gel; and
c) drying the gel obtained in the reacting b),
wherein composition (A) comprises, based on the composition (A):
from 1 to 17% by weight of at least one monool (am), wherein the monool is selected from aliphatic or aromatic monools with 1 to 20 carbon atoms,
from 65 to 90% by weight of at least one polyfunctional isocyanate as component (ai), and
from 0.1 to 20% by weight of at least one catalyst as component (ac),
wherein component (ac) is at least one selected from the group consisting of dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, N,N,N,N,N-pentamethyldiethylenetriamine, methylimidazole, dimethylimidazole, aminopropylimidazole, dimethylbenzylamine, 1,6-diazabicyclo[5.4.0]undec-7-ene, trisdimethylaminopropylhexahydrotriazine, triethylamine, tris(dimethylaminomethyl)phenol, triethylenediamine (diazabicyclo[2.2.2]octane), dimethylaminoethanolamine, dimethylaminopropylamine, N,N-dimethylaminoethoxyethanol, N,N,N-trimethylaminoethylethanolamine, triethanolamine, diethanolamine, triisopropanolamine, diisopropanolamine, methyldiethanolamine, butyldiethanolamine, metal acetylacetonates, ammonium ethylhexanoates and metal acetates, propionates, sorbates, ethylhexanoates, octanoates and benzoates, and
wherein reinforcing materials are not present in the mixture (I).

2. The process according to claim 1 , wherein the composition (A) comprises less than 1% by weight of water.

3. The process according to claim 1 , wherein the composition (A) is substantially free of aromatic amines.

4. The process according to claim 1 , wherein the % by weight of the components (ai), (am) and (ac) of the composition (A) add up to 100% by weight.

5. The process according to claim 1 , wherein the component (ai) is an isocyanate mixture.

6. The process according to claim 1 , wherein the catalyst catalyzes trimerization to form isocyanurate groups.

7. The process according claim 1 , wherein the component (ac) comprises a catalyst catalysing trimerization to form isocyanurate groups and an amine catalyst.

8. The process according to claim 1 , wherein the drying c) is carried out by converting liquid comprised in the gel into the gaseous state at a temperature and a pressure below the critical temperature and the critical pressure of the liquid comprised in the gel.

9. The process according to claim 1 , wherein the composition (A) comprises:
from 68 to 90% by weight of the at least one polyfunctional isocyanate as component (ai); and
from 0.2 to 18% by weight of the at least one catalyst as component (ac), and
in each case based on the total weight of the composition (A), where the % by weight of the components (ai), (am) and (ac) of the composition (A) add up to 100% by weight.

10. The process according to claim 1 , wherein an inorganic filler is not present in the mixture (I).

11. The process according to claim 1 , wherein the mixture (I) consists essentially of:
(i) the composition (A); and
(ii) the solvent (B);
wherein in the composition (A), the % by weight of the components (ai), (am) and (ac) add up to 100% by weight.

Assignees

• Basf Se

Inventors

• Loelsberg Wibke
• Fricke Marc
• Weinrich Dirk

Classifications

• F16L59/065

  using vacuum (F16L59/075 takes precedence) · CPC title

• C08J2201/0502

  the liquid phase being organic · CPC title

• C08J9/286 Primary

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

• C08J9/28 Primary

  by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum · CPC title

• C08J3/12

  Powdering or granulating · CPC title