Hydrophilic polyester particles and preparation method thereof

The invention relates to the technical field of high polymer materials, in particular to hydrophilic polyester diced particles and a preparation method thereof.The preparation method comprises the following preparation steps that terephthalic acid, ethylene glycol, auxiliaries and first hydrophilic monomers are evenly mixed according to a certain proportion and then added into a polymerization kettle, the temperature is increased to 140-160 DEG C, and pressurized esterification is conducted; pressurizing and esterifying until the esterification rate reaches 90% or above, releasing the pressure to normal pressure, adding a certain amount of second hydrophilic monomer for normal-pressure esterification, ending esterification until the temperature is reduced to 90 DEG C, adding an ethylene glycol antimony catalyst for polycondensation reaction after esterification is finished, heating to 230-240 DEG C, starting to vacuumize to 100 pa or below, reacting for 1-2 hours under high vacuum, and stopping polycondensati