Method for making a quasi-incompressible phase-change material with low thermal conductivity, and resulting product
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United States of America Patent
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Sep 12, 2006
Grant Date -
Feb 12, 2004
app pub date -
Apr 24, 2001
filing date -
May 19, 2000
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Abstract
A method for making a quasi-incompressible phase-change material (PCM) having low thermal conductivity includes combining with a phase-change material (PCM) in liquid state a thickening agent selected to reduce significantly thermal convection, the formed material having, depending on the combinations performed, a gelled structure or a colloidal dispersed system. The PCM may be a mixture of chemical compounds of the family of alkanes, paraffins, waxes, fatty alcohols, fatty acids and the like, and the thickening agent may be organic (aromatic ureas), organometallic (alkaline or alkaline earth soaps) or purely inorganic (silica, silico-aluminates such as bentonite made oleophilic). The material is useful for thermal isolation of containers or pipes, and in particular for thermal insulation of hydrocarbon carrying pipes.
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