Preparation and Cool-feeling Application of High-Temperature-Resistant and High-Entropy Phase Change Microcapsules

In order to address the issue of the cool-feeling property of cool-feeling fabrics deteriorating after printing and coating, the phase change microcapsules (PCMs) with high phase-transition enthalpy and high thermal stability was fabricated for the coating of cool-feeling fabrics, conferring printed patterns to the cool-feeling fabrics without compromising their cool-feeling attributes. The melamine resin-coated n-octadecane PCMs were synthesized via deposition polymerization and blended with binders and crosslinking agents to formulate the printing coating slurry, which was utilized for the coating and printing of 3 cool-feeling fabrics. The phase-transition enthalpy, thermal stability, and contact transient cool-feeling of the PCMs and their coated cool-feeling fabrics were examined. The experimental outcomes indicated that the surface of the PCMs was smooth, with an phase-transition enthalpy of 197 J/g and a thermal decomposition temperature of 288 ℃. When the PCMs slurry was prepared at a mass ratio of PCMs: binder: crosslinking agent of 70:25:5 and applied to the fabric coating, the PCMs on the fabric surface were clearly discernible. The phase-transition enthalpy of the 3 cool-feeling fabrics were 26.0 J/g, 24.6 J/g, and 21.5 J/g respectively, and the cool-feeling coefficient of the PCMs cool-feeling fabrics was further enhanced and Qmax≥0.24 W/cm². After soaping, the phase-transition enthalpy retention rate of the PCMs coated composite fabrics exceeded 90%, still maintaining excellent cool-feeling effects.