Production method of inflaming retarding hollow polyster fiber

Abstract

The invention discloses a production method of an inflaming retarding hollow polyster fiber. The production method is characterized by comprising the following process steps of: mixing the polyester raw materials (namely terephthalic acid and ethylene glycol) uniformly in the mole ratio of 1.12:1, conducting esterification and condensation polymerization on the mixture to obtain polyethylene glycol terephthalate melt, and pumping the polyethylene glycol terephthalate melt in a primary-pass static mixer; after a phosphorus flame retardant is heated and dried, pumping by a metering pump an inflaming retarding melt heated and melted in a screw rod extruder into the primary-pass static mixer; mixing the polyethylene glycol terephthalate and the inflaming retarding melt by the primary-pass static mixer to form a mixed melt, processing the mixed melt by a mixed melt boosting pump, pumping the mixed melt by a melt filter and a secondary-pass static mixer in sequence so as to feed the mixed melt in a spinning jet to form small hollow filiform flows, shock-cooling the mixed melt to cure the mixed melt into fibers. The production method has the advantages that the process flow is reasonable, the quality of the fibers can be guaranteed easily, and the inflaming retarding efficiency of the fibers is high.

Description

technical field [0001] The invention relates to a textile fiber preparation process, in particular to a production method of functional hollow polyester. Background technique [0002] Polyester hollow fiber is a differentiated fiber product that develops rapidly in my country. In addition to its special luster, stain resistance, anti-pilling properties, and the ability to improve the elasticity and bulkiness of the fiber, it also has a small relative density, The advantage of good hand feeling is widely used in home textile products, textile filling materials, artificial fur and non-woven fabrics and other industries. Polyester hollow fiber is made by mixing polyester raw materials PTA (terephthalic acid) and EG (ethylene glycol) in proportion, and under the action of a catalyst, undergoes two stages of esterification, two stages of precondensation polymerization and one stage of final polycondensation reaction. Polyethylene terephthalate (polyester) melt is obtained, a...

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Problems solved by technology

[0004] Although the existing flame-retardant fiber production process has realized the flame-retardant modification of synthetic fibers such as polyester, there are still many significant deficiencies: first, the existing flame-retardant polyester fiber production process is to mix polyester chips with flame retardants, The indirect spinning production method that remelts into the spinning box, this production method not only has the disadvantages of long process flow, high labor, energy consumption and material consumption, but also it is difficult to remove all the raw materials after absorbing water, which makes the polyester chips melt during the melting process. Polymers are prone to thermal cracking, thermal oxidative cracking and hydrolysis reactions at high temperatures, which greatly reduce the quality of the final fiber product. The vaporization of water in the melt will also increase the spinning breakage rate, and even make spinning impossible in severe cases. At the same time, there are too many impurities and powders in the melt in this indirect spinning, which also directly affects the quality of fiber products, and the fiber cross-section is a solid structure with a single function and structure, which cannot meet the requirements of textiles for differential fibers and functional fibers. comprehensive requirements

In addition, most of the flame retardants in the existing polyester fibers still use halogenated flame retardants. Although halogenated flame retardants have the advantages of good flame retardant effect, halogenated flame retardants have a large amount of smoke and the hydrogen halide gas released It is corrosive and will produce toxic and carcinogenic substances, which are harmful to human health and the environment; especially when the flame retardant is added to the polyester chip and then melt-spun, the flame retardant cannot be evenly dispersed in the polyester chip Not only is it not conducive to the improvement of the flame retardant effect, but also increases the amount of flame retardant

In addition, there are unreasonable phenomena in the existing melt spinning process path, the selection of each process parameter and the correlation between parameters, and little consideration is given to the mutual coordination and ratio of various parameters, which is not conducive to the improvement of production efficiency. It is also not conducive to the improvement of the quality of fiber products

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