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为了获得适用于建筑领域的相变材料和相变温度,选用月桂酸(LA)和棕榈酸(PA)共混制备的二元低共熔脂肪酸(LA-PA)作为储能材料,废弃稻草和稻草灰提取的生物基SiO_2(b-SiO_2)粉末作为载体,采用熔融浸渗法制备了LA-PA/b-SiO_2定形相变储能材料。采用FTIR、XRD、比表面测试、SEM、DSC、TGA对LA-PA/b-SiO_2复合相变材料的结构与性能进行分析。结果表明:LA-PA和b-SiO_2并不是简单的物理相互作用;LA-PA被束缚在b-SiO_2多孔网络中,从而在固相变为液相时,相变材料不会泄露。通过XRD分析可得,随着b-SiO_2含量的增加,LA-PA/b-SiO_2复合相变材料的结晶度降低。由DSC和TGA分析可知,LA-PA/b-SiO_2复合相变材料具有良好的相变性质和热稳定性,相变焓在67.36~146.0J/g之间。
In order to obtain the phase change material and phase transition temperature suitable for the construction field, the binary eutectic fatty acid (LA-PA) prepared by blending lauric acid (LA) and palmitic acid (PA) was used as energy storage material, The bio-based SiO 2 (b-SiO 2) powder extracted from straw ash was used as a carrier to prepare LA-PA / b-SiO 2 phase change energy storage materials by melt infiltration method. The structure and properties of LA-PA / b-SiO_2 composite phase change materials were analyzed by FTIR, XRD, BET, SEM, DSC and TGA. The results show that LA-PA and b-SiO 2 are not simple physical interactions; LA-PA is bound to the b-SiO 2 porous network, so that the phase change material will not leak when the solid phase changes to liquid phase. By XRD analysis, the crystallinity of the LA-PA / b-SiO 2 composite phase change material decreases as the b-SiO 2 content increases. The results of DSC and TGA show that LA-PA / b-SiO 2 composite phase change material has good phase transition property and thermal stability, and the enthalpy of phase transition is between 67.36 and 146.0 J / g.