Study On The Performance Of Phase Change Energy Storage Material Based HDPE

Nowadays, with the progress of science and technology, the improvement of living standards,people are fully aware that the requirement of the energy demand become more and more, both in the field of production and our life, but the energy depletion intensifies day by day, therefor,how to reasonable development and utilization of energy has attracted more and more attention. In a certain temperature range, Phase change energy storage material could absorption the latent from the environment or release of heat to the environment, through the change of itself phase or structural,so as to achieve the control of temperature, when the temperature of environment is higher than the phase change materials, materials can absorb and store heat from the environment, thus reduce the environmental temperature; when the environment temperature is lower than the phase transition temperature,material will release the stored heat from the environment, which could improve the environmental temperature.In this paper,we use paraffin wax, stearic acid and lauric acid as phase change material, use high density polyethylene (HDPE) as the carrier matrix, The above materials was prepared with phase change energy storage materials by means of melt blending.We studied the mechanical properties, thermal conductivity, diffusion properties, thermal properties of phase change storage materials with different content of paraffin and the same content of paraffin which with different content of inorganic fillers. At the same time, we also studied the mechanical properties, thermal conductivity, diffusion properties, thermal properties of Phase change material which was composed by different proportion of stearic acid and lauric acid.The experimental results show that, when we use pure 58# paraffin as phase change material, the content of paraffin is 50%, the phase transition temperature of phase change storage which prepared by melt blending materials is 50.4 "C, reaching the lowest value,its exudation percentage is 28.3%, which belongs to small amount of effusion; the image analysis of SEM showed that the HDPE has reached a good effect on paraffin package; thermal conductivity is 0.5782W/(m·K), reached the maximum; but increasing paraffin content also make the mechanical properties decrease. According to the performance considerations, when the content of wax is 50%, Each performance of phase change materials prepared is better. Adding diatomite and activated carbon, the tensile strength and elongation at break of the phase change material was enhanced, the ability of coating material of paraffin wax was enhanced, the diffusion of paraffin wax in phase permeability was avoided, The samples which adding diatomite and activated carbon,the latent heat of the phase change material has slightly decreased. When we choose the blend of stearic acid and lauric acid as phase change materials, the proportion of stearic acid and lauric acid is 8:2, the content is 40%, phase transformation temperature is 37.56? testing phase change materials by melt blending with HDPE prepared by DSC, the latent heat of phase transformation is 148.28J/g, the phase transition temperature of the samples that joined diatomite can up to 35?, basically can close to room temperature; with the addition of inorganic filler, the tensile strength of the phase change material gradually increased, the tensile strength of samples adding diatomite is up to 27.8Mpa, elongation is 13.5%, the mechanical properties of materials can be enhanced when we add diatomite; the image analysis of SEM showed that the specimen surface comparison smoother when we add activated carbon, almost no liquid leakage; The data of osmosis diffusion circle method Indicated that, after adding activated carbon, the exudation percentage oh blends which composed by stearic acid and lauric acid is 14.5%, up to trace leakage degree, the adsorption effect is good; the thermal conductivity of phase change materials has dropped a little when active carbon is added, the effect of heat conduction is higher than the sample that adding diatomite.