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以十八烷(OC)为相变材料、膨胀石墨(EG)为支撑结构制备出OC质量含量为90%的十八烷/膨胀石墨复合相变储热材料(OC/EG-PCM)。将OC/EG-PCM掺入到普通硅酸盐水泥中,制备出了相变材料质量含量分别为2%、5%、7%、10%的标准储热水泥立方体(70.7×70.7×70.7mm3)和储热水泥板(10×100×100mm3),测量了储热水泥立方体的表观密度和抗压强度,以及储热水泥板的导热系数和储热性能。结果表明,随着OC/EG-PCM质量含量的增加,储热水泥立方体的表观密度和抗压强度逐渐下降,储热水泥板的导热系数也近似于线性减小,储热水泥板的上下表面温差则逐渐增大。当OC/EG-PCM的质量含量为10%时,储热水泥立方体的抗压强度大于10MPa,储热水泥板的上下表面温差大于4.0℃。
An octadecane / expanded graphite composite phase change heat storage material (OC / EG-PCM) with OC content of 90% was prepared by using octadecane (OC) as phase change material and expanded graphite (EG) as support structure. The OC / EG-PCM was incorporated into ordinary Portland cement to prepare a standard heat storage cement cube (70.7 × 70.7 × 70.7mm3) containing 2%, 5%, 7% and 10% ) And heat storage cement board (10 × 100 × 100mm3). The apparent density and compressive strength of heat storage cement cube were measured, and the thermal conductivity and heat storage performance of heat storage cement board were measured. The results show that with the increase of the mass fraction of OC / EG-PCM, the apparent density and compressive strength of the heat storage cement cube decrease gradually, and the thermal conductivity of the heat storage cement board also decreases linearly. Surface temperature is gradually increased. When the mass content of OC / EG-PCM is 10%, the compressive strength of heat-stored cement cube is more than 10MPa, and the temperature difference between the upper and lower surfaces of heat storage cement board is more than 4.0 ℃.