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基于相变理论,选用聚乙二醇(PEG)作为相变材料,多孔火山岩作为基体,运用真空吸附及环氧包封试验方法,制得PEG/多孔火山岩复合相变材料;采用FTIR、DSC等试验手段分别对PEG/多孔火山岩复合相变材料的储热性能、热稳定性和力学性能进行表征。结果表明:PEG均匀地吸附在火山岩的多孔结构中,平均吸附率为16.17%;经环氧树脂包封后,190℃相变材料不会发生泄漏;PEG、多孔火山岩间没有新物质生成,仅为物理结合;复合相变材料的相变起始温度为41.9℃,相变焓为40.61J/g;导热系数为0.558W/(m·K);压碎值为17.9%。
Based on the phase transition theory, polyethylene glycol (PEG) was chosen as phase change material and porous volcanic rock as matrix. The composite phase change material of PEG / porous volcanic rock was prepared by vacuum adsorption and epoxy encapsulation test. FTIR and DSC Experimental methods were used to characterize the thermal storage, thermal stability and mechanical properties of PEG / porous volcanic composite phase change materials respectively. The results showed that PEG adsorbed uniformly on the porous structure of volcanic rocks with an average adsorption rate of 16.17%. No leakage occurred at 190 ℃ after encapsulation by epoxy resin. There was no new material formed between PEG and porous volcanic rocks, and only The phase transition temperature of composite phase change material was 41.9 ℃, the enthalpy of phase transition was 40.61J / g, the thermal conductivity was 0.558W / (m · K) and the crush value was 17.9%.