In 1941, J.R. Winfield and J.T. Dixon of the United Kingdom first successfully developed polyester fiber in the laboratory using terephthalic acid and ethylene glycol as raw materials, and named it Trilon. In 1953, the United States produced polyester fiber under the trade name Dacron. Subsequently, polyester fiber has been rapidly developed in various countries around the world. In 1960, the world output of polyester fiber surpassed polyacrylonitrile fiber, and in 1972 it surpassed polyamide fiber, becoming the largest variety of synthetic fiber. The specific gravity of performance polyester is 1.38; the melting point is 255～260℃, and it starts to stick at 205℃. The safe ironing temperature is 135℃; the moisture absorption is very low, only 0.4%; the breaking strength of filament is 4.5～5.5 g/den, short fiber is 3.5～5.5 g/den; the elongation at break of filament It is 15-25%, short fiber is 25-40%; high-strength fiber has a strength of 7-8 g/denier and an elongation of 7.5-12.5%. Polyester has excellent wrinkle resistance, elasticity and dimensional stability, good electrical insulation properties, resistance to sunlight, abrasion, mildew and decay, good resistance to chemical reagents, and resistance to weak acids and alkalis.
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