PEG/UPR/石墨烯复合相变材料的制备及其在节能建筑中的传热性能研究

Preparation of Polyethylene Glycol/Unsaturated Polyester Resin/Graphene Composite Phase Change Material and Study on Heat Transfer Performance in Energy-Saving Buildings

以聚乙二醇(PEG)为相变储热材料、不饱和聚酯树脂(UPR)为封装载体、石墨烯(GNP)为导热填料,通过熔融共混法制备出新型PEG/GNP/UPR复合相变材料,并采用导热系数测试仪、扫描电镜、差示扫描量热仪及傅里叶红外光谱仪对其进行测试与表征。将PEG/GNP/UPR作为调温材料掺入至水泥墙体中制备出相变储热墙体,利用热流计和温度记录仪测试了PEG/GNP/UPR对水泥墙体的热物性能的影响。试验结果表明,UPR具有丰富的三维网络结构,并能通过物理吸附作用牢牢将PEG分子链段限固与锚嵌其中,此外,GNP的掺入能够显著增强复合相变材料的导热特性,且PEG/GNP/UPR的相变特性与PEG基本相似;在升温过程中,PEG/UPR/GNP不仅能够吸收和储存墙体所受辐射的大量热量,而且PEG/UPR/GNP的掺入使得墙体的密度降低,这也会增大墙体的比热容,进而改善水泥墙体的温度。

Taking polyethylene glycol( PEG) as latent heat storage material,unsaturated polyester resin( UPR) as the supporting material and graphene( GNP) as thermal conductive filler,PEG/UPR/GNP composite phase change materials was prepared by melt blending method. The thermal conductivity tester,scanning electron microscopy,differential scanning calorimeter and Fourier infrared spectrometer were used to test and characterize the performance of PEG/GNP/UPR. Then PEG/GNP/UPR were added into the cement wall as temperature-regulating material to prepare the phase-change heat storage wall. The influence of PEG/GNP/UPR on the thermal properties of the cement wall was tested by heat flowmeter and temperature recorder. The results showthat UPR has a large number of three-dimensional network structures and can firmly bind and anchor PEG molecular chain segments through physical adsorption. In addition,the addition of GNP can significantly enhance the thermal conductivity of composite PCMs,and the phase-change properties of PEG/GNP/UPR are basically similar to those of PEG. In the heating process,PEG/UPR/GNP can absorb and store a large amount of heat radiated by the wall,and the mix of PEG/UPR/GNP could reduce the density of the wall,which will increase the specific heat capacity of the wall,and then improve the temperature of the cement wall.