Polyurethane 중합에 있어서 isocyanate 경화제인 H12MDI와 IPDI의 혼합비율에 따른 물성변화를 조사하여, H12MDI 를 사용한 polyurethane resin은 단단하여 가공성 시험에서 밴딩 시 crack 발생이 심하게 일어났으며 IPDI는 비대칭적인 구조로 인하여 polyurethane resin의 구조가 얽혀 유연성을 가지므로 crack이 발생하지 않은 것으로 보인다. IPDI의 가교 도가 높아 혼합비율이 증가할수록 가공성, 내마모성, 내용제성에서도 향상됨을 알 수 있었다. 반면에, H12MDI의 혼합비 율이 높은 polyurethane resin은 코팅피막이 단단하여 내오염성에서는 우수한 결과를 얻었지만, 오히려 내용제성, 내마모성에서는 취약함을 나타냈으며 적외선 분광 스펙트럼 분석 결과와 실제 점도 경시변화를 관찰한 결과 H12MDI의 혼합비율이 증가할수록 보관 안정성은 높았으며, IPDI의 혼합비율이 높을수록 보관 안정성은 낮았다.

Most of the cultural assets in Korea are wooden structures. Due to the material characteristics of wood, the preservation of traditional wooden structure is impossible by simple maintenance. Damaged member is replaced with new member or completely dissolve and restore them. But member has a cultural value, so that it is impossible to arbitrarily replace each member. Although the preservation treatment method using synthetic resin is emphasized, there is no exact standard for proper reinforcement ratio. This paper is experimental study for reinforcement ratio of wooden flexural member with synthetic resins, Reinforced ratio on section area of flexural member. As a result, synthetic resin reinforcement are selected as experimental variables by proper ratio enhanced flexural capacity of reinforced wooden member than new wooden member.

Preservation of wooden structure due to deterioration and corrosion is based on preservation of original form, and wooden member should not be arbitrarily replaced or damaged. Accordingly, preservation processing method with synthetic resins is embossed. But it has an adverse effect because there is no exact standard for the reinforcement ratio with the synthetic. This paper experimental study for reinforcement ratio of wooden compressive member with synthetic resins, Reinforced ratio on section area of compressive member and direction. As a result, synthetic resin reinforcement selected as experimental variables by proper ratio enhanced compressive capacity of reinforced wooden member, than new wooden member.

The effects of the cation-to-anion resin ratio and bed depth on ion exchange performance of mixed-bed were studied at ultralow solution concentration. Breakthrough curves were experimentally obtained for NaCl solution as functions of resin ratio and bed depth. The bed depth affects the pattern of the sodium breakthrough curve but not the chloride breakthrough curve in beds because of the selectivity difference. Resin selectivity determines the shape of breakthrough curves. Some sodium and chloride breakthrough curves crossed at a point as a function of resin ratio. The lower cation-to-anion resin ratio showed the higher effluent concentration or treated volume of the crossover point regardless of the total resin weight.