Abstract: In order to reduce the damage of solar thermal radiation to the human body, a large amount of the Earth's resources have been consumed. Currently, it is imperative to research novel environmentally friendly thermal shielding materials. The study uses orthogonal experimental method to study the effects of solvent carrier type, dispersant type, modification time, and ball milling time on the dispersion stability of cesium tungsten bronze(GTO) in methyl methacrylate(MMA). Further research was conducted on the influence of different ratios of GTO/PMMA composite materials on the thermal insulation effect, and their thermal insulation mechanism was analyzed. The microscopic morphology and near-infrared absorption performance of the samples were characterized by scanning electron microscope(SEM) and ultraviolet-visible light-near-infrared spectrophotometer, and the thermal insulation performance was evaluated by a self -made thermal insulation device. The experimental results show that the optimal solvent carrier is DOTP. Under the action of dispersant KENT-1103, the best stability is achieved with a ball milling time of 24 hours and an oscillation dispersion time of 24 hours. With SEM and transmission spectroscopy analysis, the PMMA-GTO composite material has good compatibility; the sample with PMMA-0.4 wt% GTO has a visible light transmittance of 39.96%, a near-infrared light barrier of 96.91%, a haze of 8.92%, and an insulation temperature of 10.1 ℃, showing the best overall performance.

Key words: polymethyl methacrylate composite material, dispersion stability, near-infrared absorption performance, thermal insulation performance