Container having a mixture of phase-change material and graphite powder

Abstract

A container may be provided, in particular a beverage container, comprising an inner container wall and an outer container wall, an intermediate space lying between the container walls, wherein the intermediate space is filled with a mixture that contains phase-change material and graphite powder, wherein the graphite powder is introduced into the phase-change material in such a way that the mixture has a pulpy consistency at a temperature at which the phase-change material is liquid. A method may be provided for producing a container that includes the following steps: A) providing an inner container wall and an outer container wall; B) applying a mixture of graphite powder and phase-change material to the inside of the outer container wall and/or the outside of the inner container wall; C) joining the outer container wall and the inner container wall.

1 . A container comprising an inner container wall and an outer container wall, wherein an intermediate space is between the container walls, wherein the intermediate space is filled with a mixture that contains phase-change material and graphite powder, wherein the graphite powder is introduced into the phase-change material in such a way that the mixture has a sludgy consistency at a temperature at which the phase-change material is liquid. 
     
     
         2 . The container according to  claim 1 , wherein the ratio of a useful container volume to mixture volume amounts to 10:1 to 10:10. 
     
     
         3 . The container according to  claim 1 , wherein the phase-change material comprises at least one of a natural wax, a Montan wax, a fatty acid, a fatty acid ester, a sugar alcohol, a salt hydrate, paraffin, stearic acid, or a wax. 
     
     
         4 . The container according to  claim 1 , wherein the phase-change temperature of the phase-change material lies in the range of the desired consumption temperature. 
     
     
         5 . The container according to  claim 1 , wherein a structure is present in the intermediate space which contributes to mechanical stability, wherein the structure can be a constituent of the inner and/or the outer container wall. 
     
     
         6 . The container according to  claim 1 , wherein the inner container wall has a thermal conductivity of at least 10 W/mK. 
     
     
         7 . A method for producing a container, the method comprising:
 A) providing an inner container wall and an outer container wall;   B) applying a mixture of graphite powder and phase-change material to the inside of the outer container wall and/or the outside of the inner container wall;   C) joining the outer container wall and the inner container wall.   
     
     
         8 . The method according to  claim 7 , wherein first step A) is carried out, then step B), and then step C). 
     
     
         9 . The method according to  claim 7 , wherein after step A), step C) is carried out before step B), and the applying the mixture in step B) comprises adding the mixture to an intermediate space between the inner container wall and the outer container wall, wherein the intermediate space was created in the joining in step C). 
     
     
         10 . The container according to  claim 1 , wherein the container is a beverage container. 
     
     
         11 . The container according to  claim 2 , wherein the ratio of a useful container volume to mixture volume amounts to 10:5 to 10:7. 
     
     
         12 . The container according to  claim 3 , wherein the phase-change material consists of stearic acid. 
     
     
         13 . The container according to  claim 6 , wherein the inner container wall has a thermal conductivity of at least 20 W/mK. 
     
     
         14 . The container according to  claim 6 , wherein the outer container wall has a thermal resistance of at least 0.01 m 2  K/W. 
     
     
         15 . The container according to  claim 14 , wherein the outer container wall has a thermal resistance of at least 0.1 m 2  K/W.