Study on preparation and performance of desulfurization gypsum based composite materials
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 4.91 MPa 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 good ΔH=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.
万方数据
维普
