Novel polyester chain extender and preparation method thereof

The invention relates to a novel polyester chain extender and a preparation method thereof. The related novel polyester chain extender can obviously improve the intrinsic viscosity of the polyester and can reduce carboxyl content in the system. The novel polyester chain extender respectively comprises o-(4,4-dimethyl oxazoline) and a butanimide structure at the ortho position of the benzene ring, wherein the imide structure can react with hydroxide radical in the polyester and can obviously improve the intrinsic viscosity of the polyester; and oxazoline can perform the chain extending reaction with carboxyl in the polyester and can reduce the carboxyl content in the system when improving the viscosity. The preparation method for the novel polyester chain extender comprises the following steps: (a) dissolving isatoic anhydride and 2-alkamine in chlorobenzene and adding a catalyst into the mixture to perform a reaction to prepare oxazoline aniline; (b) dissolving the prepared oxazoline aniline ...