Production process for flame retardant polyester staple fibre

Abstract

The invention discloses a production process for a flame retardant polyester staple fibre. In the production process, regenerative PET (Polyethylene Terephthalate) material is used as the raw material, and the finished product is acquired by pre-treating, rotary drum drying, melt spinning, cooling and forming, winding, drafting, curling, oil applying, thermosetting and cutting-off in sequence, wherein the rotary drum drying comprises the steps of firstly drying the regenerative PET material for 7.5h-8.5h and then adding flame retardant chips with the final mass fraction of 6%-8%; the flame retardant chips are halogen-free flame retardant copolyester chips, and the total drying time is 9.5h-10.5h; both the screw rod and the spinning beam of a screw extruder in the melting spinning step areat the temperature from 268 DEG C to 278 DEG C; spinneret plates are provided with 3500 bores having the diameter of 0.2mm and are arranged in 14 circles; cooling forming is realized through circularair blow; the total draft multiple is 2.7-2.9 times; and the thermosetting temperature is 168 DEG C to 172 DEG C, and the thermosetting time is 13 minutes to 17 minutes. The production process can save the cost and is helpful for environmental protection; the produced product has a smaller linear density, a higher limited oxygen index and good flame retardant effects.

Description

technical field [0001] The invention relates to a production process of polyester fiber, in particular to a production process of flame-retardant polyester staple fiber. Background technique [0002] The fireproof performance of textiles has been paid more and more attention, while ordinary polyester fibers are flammable, which limits the application fields of polyester fibers and their fabrics. [0003] Most of the current flame-retardant polyester fibers are added with low-molecular flame retardants. The low-molecular flame retardants have a great influence on the physical properties of finished fibers (such as strength and other important parameters), and cannot fully reflect the excellent performance of polyester fibers in textiles. and the flame retardant polyester fiber added with low-molecular flame retardant, its limiting oxygen index (referring to the volume fraction concentration of oxygen when the polymer is just able to support its combustion in the mixed gas of ...

AI Technical Summary

Problems solved by technology

[0002] The fire resistance of textiles has been paid more and more attention, and ordinary polyester fibers are flammable, which limits the application fields of polyester fibers and their fabrics

[0003] Most of the current flame-retardant polyester fibers are added with low-molecular flame retardants. The low-molecular flame retardants have a great influence on the physical properties of finished fibers (such as strength and other important parameters), and cannot fully reflect the excellent performance of polyester fibers in textiles. and the flame retardant polyester fiber added with low-molecular flame retardant, its limiting oxygen index (referring to the volume fraction concentration of oxygen when the polymer is just able to support its combustion in the mixed gas of oxygen and nitrogen, is used to characterize the material Flammability, a high oxygen index means that the material is not easy to burn, and a low oxygen index means that the material is easy to burn) is low, often unable to meet the flame retardant standards required for actual use

[0004] Moreover, the production of flame-retardant polyester staple fibers is mostly made of raw materials after being sliced ​​and spun after melting and mixing with flame retardants, and the production cost is high; there are also waste PET (ie polyethylene terephthalate) bottle flakes. , sheet, film and polyester material produced in the production process of polyester blocks, waste silk and other recycled PET materials are used as raw materials to reduce costs and realize resource reuse

However, due to the uneven quality of recycled PET materials, their intrinsic viscosity and melting point are very different from those of polyester chips processed from raw materials, and they also contain more non-polyester plastic impurities and moisture, resulting in poor spinning quality. Serious impact

[0005] The addition of flame retardant will affect the viscosity of the melt during spinning and increase the friction of the equipment during the production process. The conventional recycled PET production process is limited by conditions. The linear density and flame retardancy of the flame-retardant polyester staple fiber obtained and feel can not achieve the desired effect