提出自行研制的一种低温(-25～-23℃)复合相变材料。该材料由氯化钠作为主储能剂,碳酸钾与氯化钾作为降温剂,并且筛选合适的成核剂及防相分离剂进行复合。样品的热物理性能(相变温度、相变潜热等)和热循环性能通过差示扫描量热仪(DSC)来表征;过冷度和热循环稳定性通过温度记录仪表征。结果表明:制备的两种蓄冷剂的相变温度为-25～-23℃,相变潜热200J/g以上,过冷度较小且循环100次后不会出现相分离现象。
A low temperature (-25～-23℃) composite phase change material was developed.The material consisted of sodium chloride as the main energy storage agent,potassium carbonate and potassium chloride as a cooling agent,and screened suitable nucleating agent and anti-phase separating agent for compounding.Its thermal physical performance (the phase change temperature,latent heat and so on) and thermal cycling performance were observed by DSC,sub-cooling degree and cycling stability by temperature recorder.The phase change temperature of material was -25～-23℃,the phase change latent heat was above 200J/g,the sub-cooling was small,and the phase separation will not occur after 100 cycles.
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基金资助
国家重点研发计划课题(2016YFD0400701)
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