Preparation of Expanded Graphite and Fly Ash Base High Temperature Compound Phase Transition Heat Absorption Material and Its Application in Building Temperature Regulation

Abstract

In this study, the product substance was pretreated with coal excrement as a raw product substance. Taking expanded graphite and paraffin as phase change product substances, expanded graphite and paraffin or coal excrement base high temperature compound phase transition thermal storage product substance were prepared by mixed sintering method. Firstly, the sintering mechanism of the composite should be deduced. In addition, XRD, TG-DSC and other analytical techniques were used to characterize the morphology and physical character of the product substances. In order to test the temperature regulation ability of the product substance, the composite product substance was fused with cement. The cement block added with composite product substance was taken as the research object, verify the performance of compound phase transition product substance on temperature regulation. In the experimental procedure, when phase change product substances' the proportion was less than 60%, the high temperature compound phase transition thermal storage product substances prepared were well-formed and had good crystallography, and the green body' various tissues were densely distributed. When the paraffin content was above 35 wt%, the external density, compressive strength, and cement blocks' thermal conductivity added with composite product substances increased significantly compared with ordinary expanded perlite cement blocks, which was suitable for building product substances' requirements. When the paraffin content reached 38 wt%, a temperature difference of 19.2 °C to 26.1 °C appeared in the composite product substance' corresponding cube space, indicating that room temperature can be adjusted by adding a certain phase change product substance.