γ-Al2O3法制备复合多孔树脂及其调湿与甲醛吸附性能

复合多孔树脂以其调湿速度快、湿含量高等特点比传统多孔硅胶更适合作为智能调湿材料。本文利用氢氧化铝高温分解产生活性氧化铝并释放水蒸气的致孔途径制备出复合多孔树脂。通过TG、SEM、 FTIR、XRD和氮气吸附等手段表征了该树脂的形貌和结构特征，测试了复合多孔树脂分别在高湿和低湿环境的调湿性能和饱和湿含量，讨论了多孔树脂在不同温度条件的调湿性能和在25℃时对微量甲醛的吸附性能。结果表明：本文的致孔方法能有效地使树脂内部形成多孔结构。复合多孔树脂具有良好的调湿和甲醛吸附性能。在制备过程中通过控制树脂内部的孔参数，材料能将空间相对湿度在4h内调控并维持在50%-60%的范围之内，且不受温度变化的影响，甲醛吸附量为5.55ppm/g。材料可以作为智能调湿材料用于文物保护，为文物存放环境创造一个恒湿干净的空间。

Preparation of Composite Porous Resin by γ-Al2O3 Foaming and Its Characterization of Humidity-controlling and Formaldehyde Adsorption

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.