Research On Polyethylene Glycol Composite Phase Change Heat Storage Material With Porous Matrix Prepared From Waste Electric Porcelain

How to realize the high-value utilization of waste electric porcelain materials has become a common concern.In this thesis,the high-value utilization of waste electric porcelains was achieved,by combining electric porcelain solid waste with phase change heat storage materials to prepare a new type of phase change storage material,which can be used in the field of building energy saving and agricultural greenhouse wall materials.It not only can achieve the high-value utilization of electric porcelain solid waste,but also realize the heat storage effect of building materials,leading to the dual benefits of waste electric porcelain reuse and energy saving.In this paper,waste electric porcelain was used as the main raw material,a porous ceramic matrix was prepared by the foaming method,polyethylene glycol was used as a phase change heat storage material,and waste lithium-ion battery negative electrode,that is,graphite was used as a thermal conductivity enhancement material to prepare waste-graphite polyethylene glycol/ waste electric porcelain porous matrix composite phase change heat storage material.The waste electric porcelain porous material was prepared by the foaming method,after been sintered at different sintering temperatures,the porosity of this porous matrix obtained by sintering is 60%-70%.The best result of normal temperature mechanical properties and porosity of the waste electrical porcelain porous ceramic matrix are the best can be found when the sintering temperature is 1300?.The flexural strength of sample,the compressive strength and the porosity was 11.52 MPa,1.84 MPa,and 61%,respectively.The adsorption rate of the phase change material in the phase change material/waste electrical porcelain porous matrix composite prepared by the vacuum impregnation method was 46.8%,which is 19.5% higher than that of the sample prepared by the vacuum impregnation method.The adsorption rate of the phase change material prepared by the vacuum impregnation method was 46.8%.The sample prepared by the vacuum impregnation method can absorb more phase change materials,so that the composite material has a better energy storage effect,a higher phase change enthalpy,and a better effect during use.In order to improve the thermal conductivity of the composite phase change heat storage material,the graphite waste from the negative electrode material in the waste lithium was added.PEG/waste electroporcelain-based porous matrix/graphite composite phase change energy storage material prepared by vacuum impregnation technology.The thermal conductivity of the original composite energy storage material was 0.299 W/(m K).After adding 20wt% graphite,the thermal conductivity of the composite phase change material is 0.653 W/(m K),which is 118% higher than that of the composite phase change material without graphite thermal material.In this paper,it is found that the porous material prepared at 1300? has the best mechanical properties at room temperature.And through the vacuum impregnation method and the method of adding thermal conductivity materials,the graphite waste material-polyethylene glycol/waste electric porcelain porous matrix composite phase change heat storage material with an adsorption rate of 74% was finally prepared which in accordance with environmental protection concept in our country.