생물화공 , 에너지 / 환경 : 준수계 세정제의 물성 및 세정성 평가 = Biochemical Engineering , Energy / Environment : Evaluation of Cleanness and Physical Properties of Semi - Aqueous Cleaning Agents

다국어 초록 (Multilingual Abstract)

Using four components consisting of polyoxyethylene(3, 5, 7) alkyl ether(LAE-3, 5, 7) as nonionic surfactants, Water, D-limonene as hydrophobic oil component, and an alcohol as cosurfactant, and an alcohol as cosurfactant, 36 types of cleaning agents were prepared, and their physical properties such as surface tension, viscosity, eletroconductivity and phase stability were measured. As the formulated cleaning agents have low surface tensions(30-32 dyne/㎝) and low viscosities, they are satisfied with the general physical properties of water-in-oil(W/O) cleaning agents for their industrial use. They showed a tendency that their temperature range for stable one-phase microemulsion decreased in accordance with the increase of alcohol/surfactant(A/S) ratio in the formulations. However, the temperature range of one-phase microemulsion was much more affected by hydrophilic lipophilic balance(HLB) value of the nonionic surfactant which increased its temperature range and it increased in accordance with the higher HLB value in the formulations. Although the formulated cleaning agents showed a tendency that their cleaning efficacy decreased in accordance with the increase of A/S ratio in the formulations, there was no significant difference in cleaning abietic acid as a soil, which was used for preparing a rosin-type flux. It was confirmed that the selection of surfactant type was very important for formulating a cleaning agent, since the W/O microemulsion system with the nonionic surfactant of the lower HLB value showed better cleaning efficacy than that of the higher HLB value. The removal of soil from the contaminated rinse water was measured by gravity separation method in the rinse bath. As a result, the cleaning agent system having the nonionic surfactant of HLB value 8.3-10.6 showed over 80% water-oil separation efficacy at over 40℃. Therefore, it was demonstrated in this work that the formulating cleaning agents were very effective for cleaning and economical in the possible introduction of water recycling system.