Preparation and characterization of building mortar with lauric acid-stearic acid/expanded vermiculite composite phase change material

The modified expanded vermiculite is used as the adsorbent material, and the lauric acid and stearic acid are used as the phase change materials. The shaped composite phase change material is prepared by melt blending method and vacuum adsorption method, and then mixed into the mortar to prepare the heat storage mortar. The results show that the phase change enthalpy of the composite phase change material after 16 cycles is 167.6 kJ/kg, the change rate is only 3.6%, the thermal stability is good, no leakage phenomenon, and the 28 d strength of the mortar with 30vol% composite phase change material is incorporated. It is 9.2 MPa. The heat storage mortar mixed with the shaped phase change material has excellent thermodynamic properties and can be completely applied to the building envelope to adjust the indoor temperature.