Heat insulating material

Abstract

A resin foam has a porosity (X) of not less than 80%, having a cell (L) with a cell diameter of not less than 1 μm and not more than 1000 μm, and a cell (S) with a cell diameter of not less than 0.01 μm and less than 1 μm. The resin foam is excellent in thermal insulation performance and environmental performance, further, to provide a non Freon thermal insulation foam material maintaining the excellent thermal insulation performance for a long period of time and not generating condensation easily.

1 . A resin foam having a porosity (X) of not less than 80%, a cell (L) with a cell diameter of not less than 1 μm and not more than 1000 μm, and a cell (S) with a cell diameter of not less than 0.01 μm and less than 1 μm. 
     
     
         2 . The resin foam described in  claim 1 , wherein a number density of the cell (L) is not less than 10 2 /mm 2  and not more than 10 7 /mm 2 , and a number density of the cell (S) is not less than 10 2 /μm 2  and not more than 10 7 /μm 2 . 
     
     
         3 . The resin foam described in  claim 1 , wherein two peaks are present in the cell size distribution, one peak thereof is present in not less than 10 μm and not more than 500 μm, and another peak is present in not less than 0.01 μm and less than 1 μm. 
     
     
         4 . The resin foam described in  claim 1 , comprising a biodegradable polyester resin, and at least one kind of resin selected from the group consisting of a polyether-polylactic acid block copolymer, a polypropylene resin, a methacrylic resin, an acrylonitrile-butadiene-styrene resin and a polyester resin different from the biodegradable polyester resin. 
     
     
         5 . A heat insulating material comprising the resin foam described in  claim 1 , carbon dioxide gas and a resin film, wherein the resin film is not more than 15 [mL/(m 2 ·day·atm)] (23° C., 0% RH) in carbon dioxide gas permeability, covering the resin foam and the carbon dioxide gas. 
     
     
         6 . The heat insulating material described in  claim 5 , wherein a concentration of internal carbon dioxide gas covered by the resin film is not less than 50% by volume. 
     
     
         7 . The heat insulating material described in  claim 5 , wherein the carbon dioxide gas is derived from carbon dioxide of a blowing agent. 
     
     
         8 . The heat insulating material described in  claim 7 , wherein the carbon dioxide is carbon dioxide in a supercritical state. 
     
     
         9 . The heat insulating material described in  claim 5 , wherein the resin film includes a biodegradable polyester resin. 
     
     
         10 . The resin foam described in  claim 2 , wherein two peaks are present in the cell size distribution, one peak thereof is present in not less than 10 μm and not more than 500 μm, and another peak is present in not less than 0.01 μm and less than 1 μm. 
     
     
         11 . The resin foam described in  claim 2 , comprising a biodegradable polyester resin, and at least one kind of resin selected from the group consisting of a polyether-polylactic acid block copolymer, a polypropylene resin, a methacrylic resin, an acrylonitrile-butadiene-styrene resin and a polyester resin different from the biodegradable polyester resin. 
     
     
         12 . The resin foam described in  claim 3 , comprising a biodegradable polyester resin, and at least one kind of resin selected from the group consisting of a polyether-polylactic acid block copolymer, a polypropylene resin, a methacrylic resin, an acrylonitrile-butadiene-styrene resin and a polyester resin different from the biodegradable polyester resin. 
     
     
         13 . A heat insulating material comprising the resin foam described in  claim 2 , carbon dioxide gas and a resin film, wherein the resin film is not more than 15 [mL/(m 2 ·day·atm)] (23° C., 0% RH) in carbon dioxide gas permeability, covering the resin foam and the carbon dioxide gas. 
     
     
         14 . A heat insulating material comprising the resin foam described in  claim 3 , carbon dioxide gas and a resin film, wherein the resin film is not more than 15 [mL/(m 2 ·day·atm)] (23° C., 0% RH) in carbon dioxide gas permeability, covering the resin foam and the carbon dioxide gas. 
     
     
         15 . A heat insulating material comprising the resin foam described in  claim 4 , carbon dioxide gas and a resin film, wherein the resin film is not more than 15 [mL/(m 2 ·day·atm)] (23° C., 0% RH) in catbon dioxide gas permeability, covering the resin foam and the carbon dioxide gas. 
     
     
         16 . The heat insulating material described in  claim 6 , wherein the carbon dioxide gas is derived from carbon dioxide of a blowing agent. 
     
     
         17 . The heat insulating material described in  claim 6 , wherein the resin film includes a biodegradable polyester resin. 
     
     
         18 . The heat insulating material described in  claim 7 , wherein the resin film includes a biodegradable polyester resin. 
     
     
         19 . The heat insulating material described in  claim 8 , wherein the resin film includes a biodegradable polyester resin.