Preparation and Properties of Plastic-Wood Composite Plates with Triple Thermal Management Functions
Plastic wood composites have been widely used in various fields due to their significant performance advantages.However,outdoor plastic wood composite plates have poor thermal comfort problems due to the high surface temperatures in summer.In this paper,a plastic-wood composite plates with triple thermal management functions of radiation/reflection/conductivity for passive cooling were prepared by melt-blending/molding process.The high-density polyethylene(HDPE)was used as the substrate,and the triple regulation of heat was achieved via adding zirconium dioxide(ZrO2)and boron nitride(h-BN)in the top and bottom layers,respectively.The results show that the average reflectance in the solar band(0.3-2.3 μm)and the average emissivity in the mid-infrared atmospheric window band(8-13 μm)of the top-layer film can reach 82.6%and 90.6%,respectively.After adding pigments,the average reflectance and the average emissivity can reach 48.7%and 90.6%,respectively.The in-plane and vertical thermal conductivities of the bottom layers of plastic-wood plates were 1.89 W/(m·K)and 1.71 W/(m·K),respectively.After double-layer lamination,the plastic wood composite plates with triple thermal management functions achieve a temperature drop of 7.2℃and 15℃in outdoor and indoor xenon lamp simulation tests,respectively.The plastic wood composite plates have significant heat dissipation advantages and can be widely used for passive cooling.
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