Preparation method of cation dyeable POY (Polyester Pre-Oriented Yarn)

Abstract

The invention relates to a preparation method of cation dyeable POY (Polyester Pre-Oriented Yarn). The method comprises the following steps: firstly, mixing dimethyl isophthalate-5-sodium benzenesulfonate, ethylene glycol, a catalyst and an anti-ether agent, performing transesterification, and adding the ethylene glycol and a complex ion modifier for preparation after the transesterification is ended; secondly, mixing terephthalic acid, the ethylene glycol, the catalyst, a stabilizer and a delustering agent, performing esterification reaction, adding a product obtained by preparation after theesterification reaction into a reaction system already reaching a reaction endpoint of the esterification reaction, and performing condensation polymerization to obtain a spinning melt; finally, metering, extruding, cooling, oiling and winding the spinning melt to obtain the cation dyeable POY. The method reduces the generation of impurities in a production process, thereby reducing pressure riseof a spinning assembly and a filter, prolonging the service life, ensuring the continuity and safety of the whole production flow, and achieving a good economic value and promotion value.

Description

technical field [0001] The invention belongs to the field of polyester spinning, and in particular relates to a cationic dyeable polyester POY yarn. Background technique [0002] Due to the high crystallinity, high degree of orientation and high glass transition temperature of PET fibers, it is difficult for dyes to diffuse into PET molecules in the presence of normal pressure and no carrier, and it is difficult to dye. Therefore, the dyeing of PET fibers needs to be done under high temperature and high pressure. or in the presence of a carrier. Cationic dyeable PET chip (CDP) is a copolymer formed by introducing a third component into the macromolecular chain of PET, which overcomes the shortcomings of polyester that is not easy to dye, and has become the next largest bright and semi-dull PET. Another important PET variety after slicing, in which the third component generally contains a strongly acidic sodium sulfonate group -SO 3 Na, the sodium sulfonate group can chemic...

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Problems solved by technology

[0003] However, due to the addition of the third component in the CDP melt, its apparent viscosity is relatively large, and the impurities produced in the production process also increase accordingly, causing the pressure of some spinning components and the pressure difference of the filter to rise faster. There are carbonized cokes on the inner wall of the pipeline. These carbonized cokes adhere to the inner wall of the pipeline, which is easy to cause blockage of the pipeline system and is not easy to be removed, which brings great difficulties to the dredging of the pipeline. In addition, in the production of this kind of fiber In the process, the service life of the filter is greatly reduced, generally only one week, while the service life of some other spinning components is generally only 10 days, so it is necessary to clean and replace the spinning components frequently, which will not only increase the operating cost, but also Will affect the continuity and safety of the entire production process