Abstract: As intelligent humidity control materials, porous resins have more advantages, such as high moisture content and fast absorption-desorption rate than traditional porous silica gels. A composite porous resin was prepared via a foaming method in this study, in which aluminum hydroxide was decomposed into activated alumina and water vapor was released simultaneously at high temperature. The morphology and pore structure of the composite porous resins were characterized by Thermogravimetry (TG), Scanning Electron Microscopy (SEM), X-Ray Diffractomer (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Nitrogen adsorption. Humidity control capability and saturation moisture content of the composite porous resins were tested under high humidity and low humidity conditions. Humidity control performance at various temperatures and trace formaldehyde adsorption ability at 25℃ of the composite porous resins were investigated particularly. The results show that porous structure was successfully formed in the resin. The composite porous resin has good performances on humidity control and formaldehyde adsorption. Through controlling the pore parameters of the resin by changing preparation processes, we could adjust the humidity-controlling range of the resin between 50% and 60% RH in 4h free from the influence of temperature, and the formaldehyde adsorption content of the resin was about 5.55 ppm/g. The composite porous resin could be applied as intelligent humidity control material and create a clean micro-environment for cultural relic conservation.

Key words: Composite porous resin, Humidity control, Formaldehyde adsorption, Intelligent material