Flame retardant polyester has excellent flame retardancy. When polyester meets fire, it only melts and does not burn. Although it is washed with water for 35 ~ 50 times, its flame retardancy remains unchanged.

Flame retardant polyester, modified polyester fiber with LOI of 26 ~ 34. The physical and mechanical properties, appearance and post-processing properties of most flame retardant polyester (including filament and staple fiber) are similar to those of ordinary polyester. Only a few fibers (such as wistel FR) have slightly lower strength than ordinary polyester, but do not affect textile processing. Because the structure of flame retardant fiber is loose and dye molecules are easy to enter, the dyeing speed is faster than that of ordinary polyester, and it can be dyed with disperse dyes or cationic dyes. The manufacturing methods mainly include: (1) copolymerization flame retardant modification. For example, tetrabromobisphenol A hydroxyethyl ether or phosphorus containing compound is used as comonomer, which is prepared by transesterification and polycondensation with dimethyl terephthalate and ethylene glycol. It is prepared by melt spinning and drawing; (2) Blending flame retardant modification, adding phosphorus containing compound or halogen antimony composite flame retardant in the spinning melt, and then preparing it by melt spinning and drawing; Or use composite spinning components to add flame retardant in the core layer, and the skin layer is ordinary polyester. The fiber prepared by this method not only improves the flame retardant and flame retardant durability, but also reduces the impact on the fiber properties. Although the effect of flame retardant modification by blending is not as good as that of copolymerization, the process is simple; (3) Flame retardant finishing is prepared by surface polymerization or graft copolymerization on fibers or fabrics with alkene monomers containing phosphorus or halogen, or by trimeric nitrile ammonia treatment. Mainly used for interior decoration, such as curtains and bedding; Fabrics for flight suits, tents, parachutes, ropes, aircraft covers, open warehouses, etc; Conveyor belts of oil refineries, mines and flammable and explosive factories, etc

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