Whitening/brightening master batch for producing whitened regenerated terylen and preparation method thereof

The invention relates to the field of terylen production, particularly a whitening/brightening master batch for producing whitened regenerated terylen chopped fibers from recovered polyester and a preparation method thereof. The whitening/brightening master batch for producing whitened regenerated terylen is prepared by melting and granulating the following components and polyester powder: component A: fluorescent whitening agent, brightener and heat stabilizer; component B: color master batch titanium dioxide for polyester fibers; and component C: brightening agent. The component A:component B:component C weight ratio is (1%-15%):(15%-45%):(0.1%-1.0%). The invention provides a whitening/brightening master batch for producing whitened regenerated terylen.