调湿材料是一种重要的健康环保材料.本工作以硅藻土(DE)和重质碳酸钙(GCC)为原料,用焙烧法制备了硅藻土/重质碳酸钙复合调湿材料(DE/GCC).采用X射线衍射仪、傅里叶变换红外光谱仪、场发射扫描电子显微镜和低温氮吸附法对样品的物相、表面官能团、微观形貌、表面元素组成和孔结构特性进行了表征,在恒温高湿度环境(RH=70％、80％、90％;30℃)下测试了样品的吸湿性能,并进行吸湿动力学和吸湿机理分析.结果表明,焙烧法制备的DE/GCC中生成了硅酸钙和氢氧钙石,DE/GCC的介孔含量增多,易于形成毛细管凝聚.在相对湿度为70％、80％和90％恒温高湿度环境下,DE/GCC的36 h吸湿量分别达到7.213％、11.159％和14.701％,分别提高到DE的2.1、2.9和3.0倍.吸湿过程动力学符合准二级动力学模型.
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