The invention discloses a poly(butylene succinate) which is prepared by copolymerizing
succinic acid, butylene glycol and cyclic dibasic
alcohol. The poly(butylene succinate) comprises
succinic acid residue, butylene glycol residue and cyclic
diol residue, wherein the butylene glycol residue accounts for 90-98% of the total dibasic
alcohol, and the cyclic
diol residue accounts for 2-10% of the total dibasic
alcohol. The preparation method comprises the following steps: reacting
succinic acid, butylene glycol and cyclic dibasic alcohol at 200-230 DEG C under the action of a catalyst to perform direct esterification, thereby obtaining an esterified substance; adding a stabilizer, and carrying out pre-
polycondensation reaction at 220-250 DEG C to obtain a
prepolymer; carrying out
polycondensation reaction on the
prepolymer at 235-250 DEG C while gradually reducing the vacuum degree of the
reaction system to less than 150Pa; and after the polycondensation finishes, adding
carbodiimide compounds into the
reaction product, and mixing for 2-15 minutes, thereby obtaining the poly(butylene succinate). The
polyester synthesized by the method disclosed by the invention has the advantages of
high heat resistance, high
melting point, controllable degradation rate, excellent mechanical properties and excellent processability.