CRYOGENIC INSULATION FOAM
The disclosure herein relates to cryogenic insulation foam compositions comprising a fluoroolefin blowing agent. These foams have good insulation properties at −196° C., and comprise blowing agents that contain cis- or trans-1,1,1,4,4,4-hexafluoro-2-butene or 1-chloro-3,3,3-trifluoro-1-propene.
1 . A cryogenic insulation foam consisting of a polyurethane foam, said polyurethane foam comprising a blowing agent, wherein the blowing agent comprises a fluoroolefin.
2 . The cryogenic insulation of claim 1 , where the fluoroolefin is 1,1,1,4,4,4-hexafluoro-2-butene or trans-1-chloro-3,3,3-trifluoro-1-propene.
3 . The cryogenic insulation of claim 2 wherein the blowing agent further comprises a hydrocarbon.
4 . The cryogenic insulation foam of claim 3 , wherein the hydrocarbon is methyl formate, n-pentane, isopentane, or cyclopentane.
5 . The cryogenic insulation foam of claim 1 , wherein the polyurethane foam is made from a polyester or polyether polyol.
6 . The cryogenic insulation foam of claim 1 , 2 , 3 , or 4 , wherein said foam is in a sheet.
7 . The cryogenic insulation foam of claim 1 , wherein the blowing agent comprises 1,1,1,4,4,4-hexafluoro-2-butene and 1-chloro-3,3,3-trifluoro-1-propene.
8 . The cryogenic insulation foam of claim 1 , wherein the 1-chloro-3,3,3-trifluoro-1-propene is from 0.1 to 100 weight percent of the blowing agent.
9 . The cryogenic insulation foam of claim 8 , wherein the 1-chloro-3,3,3-trifluoro-1-propene is from 10 to 90 weight percent of the blowing agent.
10 . The cryogenic insulation foam of claim 7 , wherein the 1-chloro-3,3,3-trifluoro-1-propene is from 1 to 99 weight percent of the blowing agent, and the 1,1,1,4,4,4-hexafluoro-2-butene is from 99 to 1 weight percent of the blowing agent.
11 . The cryogenic insulation foam of claim 1 , wherein the 1,1,1,4,4,4-hexafluoro-2-butene is from 0.1 to 100 weight percent of the blowing agent.
12 . The cryogenic insulation foam of claim 8 , wherein the 1,1,1,4,4,4-hexafluoro-2-butene is from 10 to 90 weight percent of the blowing agent.
13 . The cryogenic insulation foam of claim 7 , wherein the 1-chloro-3,3,3-trifluoro-1-propene is from 1 to 99 weight percent of the blowing agent, and the 1,1,1,4,4,4-hexafluoro-2-butene is from 99 to 1 weight percent of the blowing agent.