BIODEGRADABLE POLYESTER USING WASTE POLYESTER AND PREPARING THEREOF

摘要

The present invention relates to a biodegradable polyester using a waste polyester and a preparing method thereof. The preparing method comprises a mixing step mixing an aliphatic acid including a carboxylic acid, a sodium 3,5-dicarbomethoxy benzene sulfonate, and a C2-14 diol component into a waste polyester; a melting step melting a mixed material; a depolymerization step depolymerizing melted material by a biodegradable modified bis hydroxyethyl terephthalate (BHET); and a polycondensing the biodegradable modified BHET.