Research On The Organics/Sepiolite Fibers Composite Phase Change Heat-Storage Materials

Phase change materaials are energy-saving materials which can absorb or release energy from phase transition to adjust the ambient temperature. Because of their bright application prospect, they are mainly used in energy-saving of architectural environment, solar energy heating and air conditioning,etc. With the development of science and technology and the requirements of the indoor environment, At the same time,in order to overcome the oil leaking and high phase-change temperature of phase change materials in phase transition processing, so researching on compound phase change materials is a hot spot in energy saving research.In this research, the natural sepiolite fibers are activated by hydrochloric acid, then continued with hot activation modification, making sepiolite fibers with increased aperture,and enhanced adsorption performance. Then according to the principle of low melting point to prepar decanoic acid/paraffin and paraffin/alcohol dual phase change materials, through the cooling curve test to find out their most satisfactory phase change temperature and compound proportion, Then mixed the best compound dual phase materials with the activated sepiolite fibers toghter, through these processions such as heating,melting and vacuum pumping etc, At last made the organic/sepiolite fibers composite phase change heat-storage materials.In order to give out a systematic description of activation sepiolite fibers and the compound heat-storage materials by using scanning electron microscopy (SEM), differential scanning calorimetry calorimeter(DSC) and thermogravimetric analyzer (TGA) and thermal conductivity(HSP). observed their microstructures, morphology characteristics and thermal chemical properties, then analysis the influence of decanoic acid, paraffin,alcohol, graphite and sepiolite fibers to the performance of composite heat-storage materials. Finally the research shows that, when the paraffin compounds with sepiolite fibers quality at 0.8:1, the compound phase change materials has a heat enthalpy 101.2J/g,and the phase transiton temperature is 53.1℃, coefficient of thermal conductivity is 0.174W/(m·k);when the decanoic compounds with sepiolite fibers quality at 1:1,the compound phase change materials has a heat enthalpy 71.6J/g,and the phase transiton temperature is 30.3℃, coefficient of thermal conductivity is 0.191W/(m·k);when decanoic acid and paraffin compounds with sepiolite fibers quality at 1:1,the compound phase change materials has a heat enthalpy 85.5J/g,and the phase transition temperature is 26.4℃, coefficient of thermal conductivity is 0.185W/(m·k).Comparing with single composite phase change materials, its stability and latent heat quantity have an improved significantly.Then put the compound heat storage materials in ordinary cemment model through a simple experiment, By the temperature and heat flux measuring, the result is that the wallboard with heat storage materials has bigger total heat and better energy-saving effection than the ordinary wallboard, considering the sepiolite's non-toxic, noncorrosive, explains that the composite change phase heat-storage materials is a kind of effective energy conservation and environmental protection heat-storage materials, which have a good application prospect.