Polyester terphthalate-co-sebate resin and preparation method thereof

The invention discloses a polyester terphthalate-sebate resin and a preparation method thereof. The polyester terphthalate-sebate resin is formed by polymerization of dibasic acid and diol. By mole percent, the diol is formed by 45-55 mol% of terephthalic acid and 45-55 mol% of sebacic acid. The diol is 1,4-butanediol, thermal performance parameters of the polyester terphthalate-sebate resin meet the following relational expression: T crystal peak width at half height / (T melting point-T crystallization temperature)=0.05-0.26; when the polyester terphthalate-sebate resin is used to manufacture a film with a thickness of 25+/-1 [mu]m, the static friction coefficient is 0.2-0.3, the light transmittance is 90% or above, the light transmittance and the static friction coefficient of the film are balanced, the film also has a low static friction coefficient while maintaining high light transmittance performance, processing can also be performed smoothly without an opening agent or a compatilizer, and the prepared polyester terphthalate-sebate resin has good transparency and processing performance.