The invention provides a process for manufacturing fire-retardant
polyester fiber. The process comprises the steps of:
fire retardant preparation, catalyst and
promoter preparation, size preparation, two grading esterification reactions, two pre-polycondensation reactions, pre-
polymer conveying and filtering, final polycondensation reactions, final
polymer conveying and filtering,
spinning melt conveying and distributing,
spinning and drafting. According to the invention,
phosphorus-based non-toxic
fire retardant 2-carboxyethyl (phenyl) phosphinic acid-
ethylene glycol (CEPPA-EG) esterifying liquid is adopted to ensure that the
heat resistance is better; compared with a conventional generally-adopted two-step
fiber producing process of firstly producing chips through batch or semicontinuous
polymerization and then carrying out
chip spinning, the process adopts an one-step
fiber producing process of a continuous
polymerization melt direct spinning method and therefore has the advantages of high production efficiency, low consumption and loss and low production cost; the manufactured fire-retardant
polyester fiber has the advantages of excellent spinnability and fiber
physical property and excellent fire retardation of
polymer per se; and the fabric manufactured by adopting the fire-retardant
polyester fiber has the advantages of more excellent and lasting fire retardation, high limit
oxygen index (LOI) which is more than 34, excellent washing durability and safety and no harm to
human body.