Preparation and thermal properties of modified binary paraffin-Hexadecylamine shaped composite phase-change energy storage materials

Binary paraffin has attracted much attention because it can control the phase change temperature range and has good flexibility. To improve the latent heat effect, a modified binary paraffin-hexadecylamine-ceramsite shaped composite phase-change energy storage material was prepared in this study through eutectic mixing and vacuum adsorption method. With eutectic binary paraffin-hexadecylamine as the core material, ceramsite as the carrier shell material and nano aluminum nitride (AlN) as the heat conduction enhancer. The thermal stability of the composites was characterized using a temperature recorder, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results showed that the optimal mass ratio of the eutectic phase-change material was solid paraffin: liquid paraffin: hexadecylamine = 50: 18: 32. The optimal mixture has a phase-change temperature of 26.5 degrees C and a latent thermal value of 204.50 J/g, indicating that it has good heat storage performance. The phase-change temperature was 1.2 degrees C earlier after the addition of 0.5% AlN, and the heat rate of storage was also improved. The mass ratio of the composite phase-change materials and ceramsite was 27.5: 72.5 is achieved by vacuum adsorption into the ceramsite. The phase-change materials are evenly dispersed and the ceramsite is well wrapped. It has good thermal stability, as verified by a 500 accelerated heating-cooling circulations below 60 degrees C, and has great potential for the development of new building energy storage materials.