Polyester produced by this method can be used for packaging and storing foods, and it has high transparency and excellent color. The specific operation steps of the production method are: (1) Esterification of TPA or esters thereof and EG at a temperature of less than 260°C. When the esterification rate reaches 90% to 92%, the esterification is stopped; (2) The product and mass fraction of (20 ~ 60) × 10 - 6 (calculated as polymer) as a thermal stabilizer of phosphorus compounds at temperatures below 285 °C and at (80 ~ 150) × 10 - 6 (by Polymers) The polyglycol solution of the hydrazine compound is subjected to polycondensation in the presence of a catalyst.
Source: Polyester Industry
