Method for making a quasi-incompressible phase-change...

C - Chemistry – Metallurgy – 09 – K

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C09K 5/06 (2006.01) E21B 17/01 (2006.01) E21B 36/00 (2006.01) F16L 59/14 (2006.01)

Patent

CA 2409026

The invention concerns a method for making a quasi-incompressible phase-change material (PCM) having low thermal conductivity, the resulting products and their uses. The method consists in 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 consists of a mixture of chemical compounds of the family of alkanes, paraffins, waxes, fatty alcohols, fatty acids and the like, and the thickening agent can be organic (aromatic ureas), organometallic (alkaline or alkaline-earth soaps) or purely inorganic (silica, silico-aluminates such as bentonite made oleophilic). The invention is useful for thermal isolation of containers or ducts, and in particular for thermal insulation of hydrocarbon ducts.

Procédé pour fabriquer un matériau à base de matériaux à changement de phase (PCM), quasi-incompressible et présentant une faible conductivité thermique, produits obtenus par le procédé et applications. Le procédé comporte la combinaison avec un matériau à changement de phase à l'état liquide (PCM) d'un agent épaississant choisi pour réduire très fortement la convection thermique, le matériau formé ayant selon les combinaisons effectuées une structure gélifiée ou bien un système dispersé de type colloïdal. Le PCM est constitué d'un mélange de composés chimiques de la famille des alcanes: paraffines, cires, alcools gras, acides gras, etc., et l'agent épaississant peut être de nature organique (urées aromatiques), organométalliques (savons alcalins ou alcalino-terreux) ou purement inorganique (silice, silico-aluminates tels que bentonite rendue oléophie, etc.). Applications pour l'isolation thermique de récipients ou de conduites, et notamment pour l'isolation de conduites d'hydrocarbures.

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