Preparation and Properties of Thermal Insulation Mortar Incorporated with Phase Change Microcapsules

In order to reduce the energy consumption of buildings, the National Phase Change Policy of ‘Carbon Neutralization and ‘Carbon Peak is responded. Based on in-situ polymerization method, a phase change microcapsule (MiPCM) suitable for thermal insulation and energy saving cement mortar was prepared by using n-octadecane-n-octadecane mixture as binary phase change core material and methyl methacrylate (PMMA) as outer wall material. MiPCM reduces the influence of external environment on the internal temperature of cement mortar through the heat absorption or heat release characteristics of internal core materials in the phase change process, thereby reducing people's dependence on air conditioners and other electrical appliances, and achieving the purpose of energy conservation and emission reduction. The experimental results showed that the phase transition temperature range and latent heat of MiPCM were 17.8—36.7 ℃ and 74.72 J/ g, respectively. MiPCM was graupel-like, without agglomeration and had obvious core-wall structure. TG analysis and thermal cycling test showed that MiPCM had good thermal stability. The temperature rise experiment was carried out by adding MiPCM into cement mortar. The results show that in the infrared heat source irradiation environment, MiPCM significantly slows down the change rate of center temperature of cement mortar, and the peak temperature of cement mortar decreases by 7 ℃. Therefore, the cement mortar with MiPCM as additive conforms to the design concept of heat preservation and energy saving. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.