Recently, functional building materials which are made of sorption materials have been widely used as board products, inorganic paints and wall papers. These remove chemical substances(VOCs, HCHO) from indoor air by physical sorption or chemical reaction and control humidity by capillary condensation. Also these materials have been used as countermeasures to sick building syndrome (SBS). However, in case of using internal building materials, the hazardous substances affecting to indoor air quality are emitted from not only the material itself but also the subsidiary materials such as adhesives for construction. Particularly in case of wallpaper and flooring material, the amount of emission from adhesives for construction is larger than that from the material itself. Therefore, this research tried to develop a technology system that can improve the performance of adsorption, absorption and desorption of moisture including the construction process that can affect to indoor air quality. To attend this end, ‘porous securement manufacturing technology system’ and ‘porous keeping construction technology system’ are developed that can secure more micropores in the process of production and construction of inorganic paint and maintain them. Consequently the reduction performance of chemical substances(VOCs, HCHO) concentrations and the humidity control performance improved almost over 30% by the technology system of the Inorganic paint.

Active clays, Diatomite, bentonite and zeolite were used as porous materials for fabricating hygroscopic gypsum boards. Pohang active clay and Cheolwon diatomite showed excellent characteristics of moisture adsorption and desorption. These characteristics were caused by higher surface area and pore volume of porous materials. Moisture adsorption content of gypsum board with 10% active clay(P1) was 62.0 g/m2, and moisture desorption content was 50.2 g/m2. Moisture adsorption content of gypsum board with 10% diatomite(P) was 59.5 g/m2, and moisture desorption content was 49.0 g/m2. Moisture adsorption contents of gypsum boards with porous materials were higher than that moisture desorption contents of gypsum board without porous materials. Correlation coefficient between surface area and moisture adsorption content of gypsum boards was 0.98. Also, correlation coefficient between surface area and moisture desorption content of gypsum boards was 0.97. Moisture adsorption and desorption contents were influenced by surface area and pore volume of the gypsum boards, and surface area had a larger effect on moisture adsorption and desorption.