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用三元乙丙橡胶(EPDM)和高密度聚乙(烯HDPE)作为包覆材料,石蜡作为相变材料,通过热熔法制备了不同石蜡用量的定形相变储能材料。恒温热老化试验表明:当石蜡用量为60%时,EPDM基定形相变材料的石蜡质量损失率不超过1%,远低于HDPE基定形相变材料的9.44%。在恒温水浴试验中,随水浴时间延长,定形相变材料的质量损失率增加;而且当石蜡用量超过60%时,EPDM对石蜡的密封效果变差,质量损失率明显增加;相同条件下,EPDM基定形相变材料的密封效果优于HDPE基定形相变材料。
EPDM and HDPE were used as cladding materials and paraffin as phase change material, and phase change energy storage materials with different amounts of paraffin wax were prepared by hot melt method. The results of isothermal aging test show that when the paraffin content is 60%, the paraffin wax mass loss rate of EPDM-based phase change material is less than 1%, which is much lower than 9.44% of the HDPE base phase-change material. In the constant temperature water bath test, the quality loss rate of the shaped phase change material increased with the prolonging of the water bath time, and the paraffin wax sealing effect became worse and the mass loss rate increased obviously when the paraffin wax content exceeded 60%. Under the same conditions, Base-shaped phase-change material sealing effect is better than HDPE base-shape phase change material.