Preparation and properties of tungsten-doped VO2 microcapsule intelligent temperature-control packaging paper

Abstract

Because of their insufficient temperature-control and waterproof property, traditional thermal-insulation materials cannot accurately control the temperature range and cannot be used for the protection of chemicals, precision instruments, and other items. In this study, waterborne acrylic resin was used as the main film former, and tungsten-doped vanadium dioxide microcapsules (PCMs/W-VO2) were used as the filler. The PCMs/W-VO2 intelligent temperature-control waterborne coating was prepared by supplementing with a flatting agent, organosilicon waterproofing agent, and other agents. The PCMs/W-VO2 intelligent temperature-control packaging paper was made by applying a waterborne coating on an ivory board. The morphology, structure, and phase-change properties of the samples were analyzed using SEM, FTIR, DSC, XRD, EDS and other techniques. And the thermal-insulation temperature difference, contact angle (CA), and mechanical properties were also tested. The results show that the prepared packaging paper had a phase-change temperature at 45 °C, the infrared light reflectance increased by 32%, and the thermal-insulation temperature difference reached 10.7 °C, showing excellent thermal-insulation temperature-control property. The XRD and EDS show that the surface of intelligent temperature-control packaging paper contains PCMs/W-VO2 microcapsules and organosilicon waterproofing agent. The SEM images show that the microcapsules were evenly distributed on the paper surface. CA analysis shows that the contact angle increased significantly, indicating that the paper sheet had good hydrophobicity. The physical properties of the paper sheet were also improved, and considering the economic factors of intelligent temperature-control coatings, the optimum tensile index, tearing index, burst index and folding index were 6.84 kN/m, 22.69 mN·m2/g, 3.60 kPa·m2 g−1 and 188 times (Resolation: 14.7 N), respectively.