秸秆纤维增强相变石膏板的制备与性能研究

Preparation and properties study of straw fiber reinforced phase change plasterboard

以石蜡微胶囊为相变储热材料,秸秆纤维为增强材料,采用共混法制备了秸秆纤维增强相变石膏板,并采用SEM、DSC和FTIR对相变石膏板的微观结构、储放热性能及冷热循环耐久性进行了研究。结果表明,石蜡微胶囊掺量为25%时,秸秆纤维增强相变石膏板具有很好的储热性能、力学性能和经济性。此时,相变石膏板的熔融相变温度为26.88℃,结晶相变温度为20.02℃,符合人体最舒适的温度范围;其熔融相变焓为19.03 J/g,结晶相变焓为20.54 J/g,导热系数为0.2978 W/(m·K),比热容为0.5597 J/(kg·K),具有良好的相变储热性能。相变石膏板冷热循环200次后的质量损失率仅为0.84%,储热性能基本保持不变,耐热性良好。

The straw fiber reinforced phase change plasterboard was developed by blending method using paraffin microcapsules as phase change heat storage materials and straw fibers as reinforcement materials.The microstructure,heat storage and release performance,and cold and hot cycling durability of the phase change plasterboard were studied and analyzed using SEM,DSC,and FTIR.The results show that when the addition amount of paraffin microcapsules is 25%,straw fiber reinforced phase change plasterboard has good thermal storage performance,mechanical properties,and economic efficiency.The melting phase transition temperature and crystallization phase transition temperature of phase change plasterboards are 26.88℃and 20.02℃,respectively,which are in line with the most comfortable temperature range for the human body.Its melting phase transition enthalpy and crystallization phase transition enthalpy are 19.03 J/g and 20.54 J/g,indicating good phase change heat storage performance.The thermal conductivity of phase change plasterboard is 0.2978 W/(m·K),and the specific heat capacity is 0.5597 J/(kg·K).The mass loss rate of phase change plasterboard after 200 cold and hot cycles is 0.84%,and the thermal storage performance remains basically unchanged,having good heat resistance.