분말사출성형에서 초임계유체를 이용한 탈지공정

Abstract

The purpose of the present study is to investigate the method decreasing debinding time as well as lowering operation condition than pure supercritical CO2 debinding by using cosolvent or binary mixture of propane + CO2. First method is to add cosolvent, such as n-hexane, DCM, methanol, 1-butanol, in supercritical CO2. In case of adding cosolvent, we were found the addition of non-polar cosolvent (n-hexane) improves dramatically the binder removal rate (more than 2 times) compared with pure supercritical CO2 debinding, second method is to use mixture of supercritical propane + CO2, as solvent. In case of using mixture of supercritical propane + CO2, the rate of debinding speeded up with increasing of pressure and concentration of propane at 348.15 K. It was found that addition of cosolvent (e.g., n-hexane, DCM) and binary mixture propane + CO2 for supercritical solvent remarkably improved binder removal rate for the paraffin wax-based binder system, in comparison with using pure supercritical CO2.