Abstract
Humidity control material is a kind of healthy environmental friendly material. The diatomite/ground calcium carbonate composite humidity control material (DE/GCC) was prepared by calcinations using diatomite (DE) and ground calcium carbonate (GCC) as raw materials. The obtained samples were characterized by X-ray diffraction, field emission scanning electron microscope, Fourier transform infrared spectroscope and low-temperature nitrogen adsorption method to determine the mineral compositions, functional groups, microstruc- ture, surface element compositions and pore structure, respectively. The moisture absorption performance of sam- ples were tested under high relative humidity conditions (RH=70%, 80%, 90%) and the constant temperature of 30 . The moisture absorption dynamics and humidity control mechanism were analyzed. It is indicated that the ℃ calcium silicate and calcium hydroxide are formed in the DE/GCC during the calcinations process. Compared with the raw materials, the content of mesopore increases in the DE/GCC sample, which is in favor of the capillary con- densation. After 36 h test in the environment with relative humidity of 70%, 80% and 90%, the moisture contents of DE/GCC reach 7.213%, 11.159% and 14.701%, which are about 2.1, 2.9 and 3.0 fold as those of DE, respectively. The moisture absorption kinetics follows the pseudo-second-order model.
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