a liquid titanium - based catalyst and method for preparing polyester polymer thereof are disclosed herein . the catalyst is made by tetrabutyl titanate , 1 - 4 butanediol , phosphate ester , hydroxycarboxylic acid , teos , acetates of metal element through heating reactions in an appropriate amount of solvent . while the catalyst maintains a high activity , the synthetic slices have good hue , with high molecular weight , stable property , resistance to hydrolysis , moreover , the catalyst is a stable multicomponent liquid catalyst based on titanium , silicon . it can be directly added or diluted to add to the raw material ester or oligoester to be poly - condensed used for synthesis of polyesters which can be used in the production of fibers , engineering plastics , films , pet bottles , sheets and profiles , etc .