高储能密度常温相变含水石蜡储能微囊制备

Preparation of Water-Containing Paraffin Energy Storage Microcapsule with Normal Phase Transition Temperature and High Energy Storage Density

采用固体石蜡和液体石蜡复合的方法，制备出常温固．液相变储能石蜡，DSC法测试表明：m（N体石蜡）：m（液体石蜡）=1：2时，复配石蜡固．液相变温度34．2℃，相变潜热34．0kJ·kg^-1，满足常温固-液相变需要。采用微乳化技术，将水稳定分散于常温固．液相变石蜡中，得到具有高储能密度的复合储能介质。通过设计采用膜乳化法制备微囊的装备，用海藻酸钠作为微囊壁材，制备得到粒度分布范围在6-26μm的球形储能微囊。储能密度测试结果表明：将水引入石蜡中后，微囊储能密度显著提高，W1／O初乳中含水10％（wt）制备的微囊较未含水微囊储能密度提高了近15倍。为相变材料的高储能密度化和微囊化，提供了新的途径和制备方法。

The energy storage compounded paraffin with normal phase transition temperature was prepared by the method of compounding the solid paraffin with liquid paraffin. The testing results of the differential scanning calorimetry （DSC） show that, when the compounded paraffin has the composition of m（solid paraffin）：m（liquid paraffin） = 1：2, it has latent heat of 34.0 kJ·kg^-1 and solid-liquid phase transition temperature of 34.2℃ which satisfies the requirement of phase change material having the phase transition temperature of normal temperature. It was also found that, when water is stably dispersed in the compounded paraffin by microemulsification technique, the water containing compounded paraffin with high energy storage density could be obtained. Based on the method of membrane emulsification, the microcapsule preparation equipment was designed, and by using it, the spherical energy storage microcapsules with particle size distribution of 6-26 μm were prepared, during which the sodium alginate was used as the wall material of the microcapsules. The energy storage tests show that introducing water into compound paraffin can notably improve its energy storage density, and it was also found that the energy storage density of microcapsule formed from W1/O foremilk containing 10%（wt） water is enhanced 14 times more than that of microcapsule formed from W1/O foremilk containing no water. The research supplies a new approach for the preparation and microencapsulation of phase change materials with high energy density.