Aluminum cans can be reused into can body material through the melting process. However, the melting process has come problems, such as the accumulation of impurities and a decrease in the molten metal yield by titanium oxides from the paints on the surface of used beverage aluminum cans (UBC). There fore, in order to reuse UBC as can material, paints, which are composed of resin and titanium oxides must be removed by pre-treating with a technical process. This study used organic oxalic acid for the swell-peeling process of paints on UBC. Oxalic acid reacted effectively with paints at 100deg C and pH range of 1.5 and easily removed most paints from the surface of UBC. However, some UBC selectively reacted with oxalic acid and the paints were swelled from the surfaces of UBC slowly due to different polymer materials used to produce the paints.
展开▼
