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 <TEX>$CO_2$</TEX> debinding by using cosolvent or binary mixture of propane + <TEX>$CO_2$</TEX>. First method is to add cosolvent, such as n-hexane, DCM, methanol, 1-butanol, in supercritical <TEX>$CO_2$</TEX>. 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 <TEX>$CO_2$</TEX> debinding, second method is to use mixture of supercritical propane + <TEX>$CO_2$</TEX>, as solvent. In case of using mixture of supercritical propane + <TEX>$CO_2$</TEX>, 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 + <TEX>$CO_2$</TEX> for supercritical solvent remarkably improved binder removal rate for the paraffin wax-based binder system, in comparison with using pure supercritical <TEX>$CO_2$</TEX>.