초록 ▼

기존 조습제 보다 제습력과 가습력이 4배 이상 우수하여 제습기나 가습기의 도움 없이도 빌딩이나 아파트 내부에 시공시 적당한 습도범위를 자율적으로 유지해주는 조습제를 개발했다. 일본에서 처음 개발된 자율 조습제는 원하는 기공구조의 유도를 위해 구조 지향제로써 계면활성제를 사용하기 때문에 제조비용이 높고 대량생산에 어려움이 있어 실제 생산은 되지 않고 있으며 대체품으로 천연 규조토를 가공한 세피오라이트 등을 원료로 하여 제조한 조습제 (‘에코캐럿’ 일본 INZS사)가 개발되어 시판되고 있다. (2001년 초). 본 연구에서는 자율 조습

기존 조습제 보다 제습력과 가습력이 4배 이상 우수하여 제습기나 가습기의 도움 없이도 빌딩이나 아파트 내부에 시공시 적당한 습도범위를 자율적으로 유지해주는 조습제를 개발했다. 일본에서 처음 개발된 자율 조습제는 원하는 기공구조의 유도를 위해 구조 지향제로써 계면활성제를 사용하기 때문에 제조비용이 높고 대량생산에 어려움이 있어 실제 생산은 되지 않고 있으며 대체품으로 천연 규조토를 가공한 세피오라이트 등을 원료로 하여 제조한 조습제 (‘에코캐럿’ 일본 INZS사)가 개발되어 시판되고 있다. (2001년 초). 본 연구에서는 자율 조습제의 제조에 구조 지향제를 사용하지 않고 규산소다 용액에 산을 첨가할 때 생성되는 실리카 분말의 층 쌓임 특성을 제어하는 신규의 역직정법으로 제조하여 기존 제조공정의 문제점을 해결하였다. 이 자율 조습제는 내부에 크기가 3~7 nm, 부피가 0.8cc/g 이상인 기공 구조를 갖고 있고 제습량이 800cc/$kg{\cdot}day$, 가습량이 400cc/$kg{\cdot}day$ 정도된다. 이것은 기존 조습제인 일본산 세피오라이트 등에 비해 4배 이상 습도 조절 능력이 뛰어난 것이다. 따라서 2005년 국내 시판을 목표로 협력업체인 선보에 기술이전을 준비 중이며 시판시에는 향후 형성될 자율 조습제 시장에서의 품질 및 가격경쟁력을 가질 수 있을 것으로 기대된다.

Abstract ▼

Humidity self-control materials have been synthesized by the aqueous Sol-Gel process. Suitable pore sizes for the adsorption-desorption of water vapor at 40~70% relative humidity was calculated to be in the range of 3.0~7.5nm. Among the experimental conditions, pH has mainly affected on the pore siz

Humidity self-control materials have been synthesized by the aqueous Sol-Gel process. Suitable pore sizes for the adsorption-desorption of water vapor at 40~70% relative humidity was calculated to be in the range of 3.0~7.5nm. Among the experimental conditions, pH has mainly affected on the pore size. The pH for the product having suitable pore size was in the range between 3 and 5.5. The products with the pore volume over 0.8cc/g could be obtained after calcining the products with the pore size of 4.0~7.2nm under $600^{\circ}C$. Surveying on the relationship of BET surface area and the pore volume, it was thought that the products with the pore size of 2.8~4.0nm were formed by Random-close packing, while the pore size of 4.0~7.2nm by Hierarchical-close packing. By analyzing the IR and $^{29}Si$ NMR spectra the type of surface silanol group of the products was confirmed as to be mainly $Q^3$. It could be seen that, only for the product with the pore size of 4.0~5.5nm, hysteresis curves on isotherm plots appeared within the ratio of relative pressure in the range of 0.4~0.7. This result indicated that the products with the pore size of 4.0~5.5nm have a good ability to control the suitable humidity in the range of 40~70% in the life environment as the humidity self-control materials. Mesoporous silicas having the average pore size of 3.0~7.5 nm have been synthesized via the aqueous sol-gel reaction and Liquid Crystal Templating (LCT), and examined on the application for a humidity self-control materials. It was possible to prepare the specimens with the pore size of 2.8~7.8 nm by the sol-gel reaction in the pH range of 3.0~5.5. By using the back titration method designed for this study, the pore volume of the specimen with the pore size of 4.0~5.5 nm and the concentration of a sodium silicate solution at the gel-point could be increased to over 0.8 cc/g and 25%, respectively. Both the surface area and the pore volume were inversely proportional to the calcination temperature. The optimal calcination temperature concerning a durability was found to be around $600^{\circ}C$. By the LCT it was possible to prepare the specimens with the pore size of 4.1 ~7.0 nm and the pore volume of over 0.9 cc/g in the pH range of 10.0~11.0 and in the 25% concentration of surfactant solution, and they had a uniform size of the hexagonal-type pore. Measurements on the amount of water vapor adsorption-desorption for the specimens prepared by the above two methods indicated that they revealed over 80% and the adsorption-desorption occurred mostly at the relative humidity between 40% and 70%. In this regard, we have estimated that the specimens could be used for a humidity self-control materials. In addition, the specimen yielded by the sol-gel reaction showed a dominant ability of humidity self-control than that by the LCT. Silica-titania cogel materials have been prepared by the aqueous sol-gel process using the back titration technique designed through this study. Also, their humidity self-control and photocatalytic properties have been investigated. In these silica-titania cogel materials, the product with relatively large pore size and pore volume, which can exhibit a good humidity control ability, were synthesized under the reaction condition with the pH of around 7 and the $SiO_2$/$TiO_2$ ratio of 9/1. The photocatalytic property, which was measured by the decomposition ratio of phenol, increased with the decrease of $SiO_2$/$TiO_2$ ratio in the composition. As the cogel with a $SiO_2$/$TiO_2$ ratio of 9 was adjusted to take the pore size of 4.0 ~ 6.0 nm and the pore volume of 0.6 ~ 0.8 $m{\ell}$/g, the amounts of moisture absorption and desorption at the relative humidity region of 40 ~ 70% were 25% and 45%, respectively, which are better humidity control ability than those conventional ones. In addition, the cogel showed superior photocatalytic property compared with that of the mixture of silica and titania in the same composition. This might be originated from the active sites by excess negative charges induced by Ti-O-Si bond formation in the cogel structure.

목차 Contents

• 표지...1
• 제출문...2
• 보고서 초록...3
• 요약문...4
• SUMMARY...10
• CONTENTS...12
• 목차...13
• 제1장 연구개발과제의 개요...14
• 제2장 국내외 기술개발 현황...15
• 제3장 연구개발수행 내용 및 결과...16
• 제1절 연구개발수행 내용 및 범위...16
• 제2절 연구개발결과...18
• 1. 자율 조습제 제조 방법...18
• 2. Pilot Scale Plant에 대한 공업화 자료 작성 및 경제성 검토 결과...24
• 3. 자율 조습기능 벽지 제조, 특성평가 및 현장 적용 시험...47
• 4. 조습제 응용제품의 제조 및 나노세공 물질 도출...52
• 제4장 목표달성도 및 관련분야에의 기여도...74
• 제5장 연구개발결과의 활용계획...75
• 제6장 연구개발과정에서 수집한 해외과학기술정보...77
• 제7장 참고문헌...81