Poly triethyl citrate and preparation method thereof

The invention discloses a poly triethyl citrate and a preparation method thereof, and the preparation method of the poly triethyl citrate is as follows: first, citric acid reacts with an alcohol to prepare triethyl citrate, poly acyl chloride is prepared by acylation of the poly carboxylic acid, and then the poly triethyl citrate is prepared by esterification reaction of the poly acyl chloride and the triethyl citrate; the preparation method has the advantages of simple operation, wide source of raw materials, and mild reaction conditions, and can meet the industrial production, the prepared poly triethyl citrate has both good plasticizing effect and excellent thermal stability, low temperature flexibility, solvent extraction resistance and transfer resistance, and can be widely used for plastic rubber plasticizers.