PET (Polyethylene Terephthalate) composition as well as preparation method and application thereof

The invention discloses a PET (Polyethylene Terephthalate) composition. The PET composition is prepared from the following components in parts by weight: 28 to 76 parts of polyethylene glycol terephthalate, 10 to 20 parts of brominated flame retardant, 2 to 6 parts of synergistic flame retardant, 10 to 40 parts of glass fiber, 1 to 3 parts of hydrotalcite, 0.5 to 2 parts of lubricant and 0.2 to 1 part of isopropoxy distearoyloxy aluminate, the lubricant is oxidized polyethylene wax with the weight-average molecular weight of 3000 to 4000; the synergistic flame retardant is sodium antimonate in which the content of Sb2O3 is less than or equal to 0.05%; the grain diameter D50 of the hydrotalcite is less than or equal to 0.70 mu m. After the PET composition is continuously baked at 210 DEG C for 1000 hours, the color difference change E is smaller than or equal to 1, the color difference change is extremely small under long-term high-temperature baking, the core demands of customers and related industries are me