Preparation and properties of temperature and humidity regulating materials based on phase change materials and inorganic porous materials
摘要
In this paper, a novel temperature and humidity regulating material (THRM) was developed by combining inorganic composite phase change materials (PCMs) with three types of porous humidity regulating materials (HRMs). Through pore size analysis, it was found that bentonite and diatomite exhibited rich mesoporous structures, and their specific surface area was much larger than that of sepiolite. The moisture regulating properties revealed that the moisture buffering value (MBV) of diatomite reached an excellent level, and it demonstrated the highest equilibrium moisture content. At 84% RH, both composite PCMs and THRMs maintained good thermal properties upon reaching moisture absorption and desorption equilibrium. By subjecting THRMs to multiple cycles of moisture absorption and desorption, it was found that the thermal properties of the material remained stable. The MBV of composite PCMs was measured at 2.49 g m−2 %RH−1. When combined with sepiolite, the moisture buffering performance of THRMs (1.46 g m−2 %RH−1) was inferior to that of the composite PCMs alone. However, when combined with bentonite or diatomite, the moisture buffering performance significantly improved, reaching approximately 3.4 g m−2 %RH−1. The dynamic analysis results indicated that the pseudo-second-order kinetic model accurately described the moisture regulation mechanism of the materials. The application of THRMs in prefabricated temporary houses confirmed their effectiveness in enhancing the hygrothermal environment. Therefore, the THRMs exhibited promising application potential, as they can simultaneously regulate both temperature and humidity under high-humidity conditions.