Abstract
In order to study the application of phase change materials in the field of building energy saving, diatomite / fatty acid shaped phase change materials were prepared by vacuum impregnation method using modified diatomite as carrier. The structural composition and thermal properties of the shaped phase change materials were analyzed. The phase change material is directly mixed into the cement mortar by stirring. The phase change mortar, phase change mortar test block and phase change mortar heat storage plate are made. Its structural properties, mechanical properties, thermal properties and energy-saving effect was detected and analyzed. The diatomite was modified by roasting, acid leaching, roasting/acid leaching. X-ray diffraction (XRD), scanning electron microscopy (SEM) and BET experiments were used to test the composition and structure of modified diatomite. The results show that the modified diatomite prepared by roasting / acid leaching method has better performance. It has the characteristics of uniform surface pore distribution, complete structure and moderate surface roughness. The stereotyped phase change material has good thermal stability at 105°C. The mass loss rate of the deformed phase change material is 41.65%. Therefore, the stereotyped phase change material can play a good role in the process of environmental temperature changes in the heat.
