RU98113145A - HEAT-INSULATING DEVICE - Google Patents

Claims (1)

1. A method of manufacturing a heat-insulating node or device containing such a node, and the node contains a core consisting of organic foamed insulating material with open cells located between the outer and inner walls of the node, including the stage of direct foaming of the insulating material in the cavity formed between the outer and inner the walls of the site, creating a vacuum in the foamed cavity and refilling the foamed cavity with an insulating gaseous composition.  2. The method according to claim 1, characterized in that the insulating gaseous composition has a boiling point below 10 ° C.  3. The method according to claim 1 or 2, characterized in that the insulating gaseous composition has a specific thermal conductivity at operating temperatures of the assembly below 25 mW / mK.  4. The method according to any one of the preceding paragraphs, characterized in that the insulating gaseous composition does not contain chlorine atoms.  5. The method according to any one of the preceding paragraphs, characterized in that the insulating gaseous composition contains an insulating gas selected from krypton, xenon, sulfur hexafluoride, 1,1,1,2-tetrafluoroethane, 1,1-dichloro-1-fluoroethane, 1 -chloro-1,1-difluoroethane and chlorodifluoromethane.  6. The method according to any one of the preceding paragraphs, characterized in that the organic foamed insulating material with open cells includes rigid polyurethane foam or urethane-modified polyisocyanurate foam having open cells. 7. The method according to claim 6, characterized in that the open-cell rigid polyurethane foam or urethane-modified open-cell polyisocyanurate foam is obtained by reacting an organic polyisocyanate with a composition reactive with respect to a polyfunctional isocyanate in the presence of a cyclic compound chemically active with respect to isocyanate having the formula :

where Y is O or NR ¹ , where each R ^{1 is} independently a C ₁ -C ₆ lower alkyl radical or a lower alkyl radical substituted by a chemically active isocyanate group;
each R is independently hydrogen, a lower alkyl radical of C ₁ -C ₆ or (CH ₂ ) _m -X, where X is an isocyanate-reactive group which is OH or NH ₂ and m is 0, 1 or 2;
n is 1 or 2;
with the proviso that at least one of R ¹ or R is an isocyanate-reactive group or includes such a group. 8. The method according to p. 7, characterized in that the compound of formula I corresponds to:

9. The method of claim 7 or 8, characterized in that it is carried out in the presence of an additional open-porous agent selected from the group consisting of fatty acids, amines of fatty acids, amides of fatty acids and esters of fatty acids.  10. The method according to claim 9, characterized in that the additional open-porous agent includes a diamine of solid fat.  11. The method according to claim 9 or 10, characterized in that the additional open-porous agent is used in an amount between 0.5 and 5% by weight, based on the total amount of foam.  12. The method according to any one of claims 7 to 11, characterized in that it is carried out in the presence of a catalyst based on a metal salt and / or amine catalyst.  13. The method according to any one of claims 7 to 12, characterized in that it is carried out in the presence of an insoluble fluorinated compound.  14. The heat-insulating unit obtained by the method according to any one of the preceding paragraphs. 15. A method of producing a open-cell rigid polyurethane foam or an open-cell modified polyisocyanurate urethane modified foam comprising a step of reacting an organic polyisocyanate with a polyfunctional isocyanate reactive composition in the presence of a cyclic compound reactive with respect to the isocyanate having the formula:

where Y is O or NR ¹ , where each R ^{1 is} independently a C ₁ -C ₆ lower alkyl radical or lower alkyl radical substituted by a chemically active isocyanate group;
each R is independently hydrogen, a lower alkyl radical of C ₁ -C ₆ or (CH ₂ ) _m -X, where X is an isocyanate-reactive group which is OH or NH ₂ and m is 0, 1 or 2;
n is 1 or 2;
with the proviso that at least one of R ¹ or R is an isocyanate-reactive group;
and in the presence of an open-porous agent selected from the group consisting of fatty acids, fatty acid amines, fatty acid amides, and fatty acid esters.  16. The method according to p. 15, wherein the open-porous agent comprises a diamine of solid fat.  17. The method according to p. 15 or 16, characterized in that the open-porous agent is used in an amount of between 0.5 and 5% by weight, based on the total amount of foam.  18. The method according to any one of paragraphs. 15 to 17, characterized in that it contains a catalyst based on a metal salt and / or an amine catalyst.