脱硫石膏基复合材料的制备及性能研究  

Study on preparation and performance of desulfurization gypsum based composite materials

作　　者：张焕 徐航 付力澜 杨怀 ZHANG Huan;XU Hang;FU Li-lan;YANG Huai(Bijie Vocational and Technical College,Bijie 551700,China)

机构地区：[1]毕节职业技术学院,贵州毕节551700

出　　处：《化学工程师》2024年第10期15-19,共5页Chemical Engineer

基　　金：毕节市科学技术联合基金项目(毕科联合〔2023〕3号):脱硫石膏基复合胶凝材料制备及力学性能试验研究。

摘　　要：为改善相变材料导热系数低的问题,本实验以脱硫石膏和石蜡为主要材料制备石蜡/石膏复合材料,再以微米级铁粉和纳米石墨片作为导热填料对其进行改性。实验结果表明,(1)在石蜡/石膏复合材料中,石蜡掺量宜为18%;(2)导热填料的添加对材料表观密度和孔隙率影响较小,会使材料力学性能降低,同时大幅度提高材料导热系数;(3)掺入18%石蜡、5%纳米石墨片的石蜡/石膏复合材料性能更佳,此时材料7d抗压、抗折强度分别是4.91MPa、2.66MPa,且热性能良好,导热系数达1.6678W·(m·K)^(-1),相变温度为67.89℃,相变潜热ΔH为74.65J·g^(-1)。综上,这种复合材料有着较高的导热系数和良好的相变储能效果,可以作为建筑节能材料进一步研究推广。To improve the problem of low thermal conductivity of phase change materials in building envelope structures,this experiment first prepared paraffin/gypsum composite materials with desulfurization gypsum and paraffin as the main materials,and then modified them with micrometer scale iron powder and nano graphite sheets as thermal conductive fillers.The experimental results show that(1)in the paraffin/gypsum composite material,the paraffin content should be 18%;(2)The addition of thermal conductive fillers has little effect on the apparent density and porosity of the material,which can reduce the mechanical properties of the material and significantly increase the thermal conductivity;(3)The performance of paraffin/gypsum composite material mixed with 18%paraffin and 5%nano graphite flakes is better.At this time,the 7 day compressive and flexural strength of the material are 4.91MPa and 2.66MPa,respectively,and the thermal performance is good.The thermal conductivity coefficient reaches 1.6678W·(m·K)^(-1),the phase transition temperature is 67.89℃,and the latent heat of phase transition is goodΔH=74.65J·g^(-1).In summary,this composite material has a high thermal conductivity and good phase change energy storage effect,which can be further studied and promoted as an energy-saving material for buildings.

关 键 词：相变材料 导热系数 脱硫石膏 纳米石墨片 相变潜热 

分 类 号：TB332[一般工业技术—材料科学与工程]