A kind of preparation method of cationic dyeable polyester fiber

A polyester fiber, cationic technology, applied in the field of polyester spinning, can solve the problems affecting the continuity and safety of the production process, the rapid rise of the pressure difference of the filter, and the reduction of the service life of the filter, etc., to ensure the spinnability. , the effect of reducing coordination and reducing impurities

Active Publication Date: 2020-10-02
JIANGSU HENGKE ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of preparation method of cationic dyeable polyester fiber, the steps are as follows:

[0048] a) preparing a spinning melt;

[0049] (1) transesterification reaction prepares bishydroxyethyl isophthalate-5-sodium sulfonate;

[0050] First, dimethyl isophthalate-5-sodium benzenesulfonate and ethylene glycol with a molar ratio of 10:1 are put into the preparation kettle, and the catalyst Zn(Ac) is added. 2 Carry out the transesterification reaction at 176°C until the distilled amount of water reaches 91% of the theoretical value, and obtain bishydroxyethyl isophthalate-5-sodium sulfonate. After the reaction, add ethylene glycol and ethylene glycol Potassium and sulfuric acid are modulated to obtain the ethylene glycol solution containing 30.4wt% bishydroxyethyl isophthalate-5-sodium sulfonate, wherein catalyst Zn(Ac) 2 The addition amount of dimethyl isophthalate-5-sodium benzene sulfonate is 0.5wt% of the addition amount of dimethyl isophthalate-5-sodium benzene...

Embodiment 2

[0067] A kind of preparation method of cationic dyeable polyester fiber, the steps are as follows:

[0068] a) preparing a spinning melt;

[0069] (1) transesterification reaction prepares bishydroxyethyl isophthalate-5-sodium sulfonate;

[0070] First, put dimethyl isophthalate-5-sodium benzenesulfonate and ethylene glycol in a molar ratio of 10.5:1 into the preparation kettle, add the catalyst Zn(Ac) 2 Carry out the transesterification reaction at 178°C until the distilled amount of water reaches 92% of the theoretical value, and obtain bishydroxyethyl isophthalate-5-sodium sulfonate. After the reaction, add ethylene glycol and ethylene glycol Sodium and sulfuric acid are modulated to obtain the ethylene glycol solution containing 31wt% bishydroxyethyl isophthalate-5-sodium sulfonate, wherein catalyst Zn(Ac) 2 The addition amount of dimethyl isophthalate-5-sodium benzene sulfonate is 0.2wt% of the addition amount of dimethyl isophthalate-5-sodium benzene sulfonate; 3wt% o...

Embodiment 3

[0085] A kind of preparation method of cationic dyeable polyester fiber, the steps are as follows:

[0086] a) preparing a spinning melt;

[0087] (1) transesterification reaction prepares bishydroxyethyl isophthalate-5-sodium sulfonate;

[0088] First, put dimethyl isophthalate-5-sodium benzenesulfonate and ethylene glycol into the preparation kettle with a molar ratio of 11:1, add the catalyst Zn(Ac) 2 Carry out the transesterification reaction at 175°C until the distilled amount of water reaches 90% of the theoretical value, and obtain bishydroxyethyl isophthalate-5-sodium sulfonate. After the reaction, add ethylene glycol and ethylene glycol Calcium and sulfuric acid are modulated to obtain the ethylene glycol solution containing 30wt% bishydroxyethyl isophthalate-5-sodium sulfonate, wherein catalyst Zn(Ac) 2 The addition amount of dimethyl isophthalate-5-sodium benzene sulfonate is 0.3wt% of the addition amount of dimethyl isophthalate-5-sodium benzene sulfonate; 1.5wt...

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Abstract

The present invention relates to a preparation method for a cationic dyeable polyester fiber. First, mixing dimethyl isophthalate-5-benzenesulfonate sodium, ethylene glycol and a catalyst for transesterification; after the completion of the transesterification, adding ethylene glycol, a complex ion regulator and sulfuric acid to adjust the mixture; mixing terephthalic acid, ethylene glycol, a catalyst and a flatting agent for esterification reaction; adding a product obtained by adjusting the mixture after the transesterification to a reaction system which reaches the end of the esterification reaction to carry out polycondensation to obtain a spinning melt; and subjecting the spinning melt to metering, extrusion, cooling, oiling, stretching, heat setting and winding to obtain the cationic dyeable polyester fiber. According to the present invention, impurities generated in a fiber production process are reduced, thereby reducing the pressure rise of a spinning assembly and a filter, prolonging the service cycle, reducing the production cost and further ensuring the continuity and safety of the whole production process. Therefore, the method has good economic value, and is suitable for popularization.

Description

technical field [0001] The invention belongs to the field of polyester spinning, in particular to a preparation method of cationic dyeable polyester fiber 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 dye-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 best choice for 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 sulfonat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92D01F1/10C08G63/688C08G63/78
CPCC08G63/46C08G63/688C08G63/78D01F1/10D01F6/92C08G63/866D01D5/088D01D5/096D10B2331/04D10B2401/14
Inventor 苏琦柴森光刘彪张爱民
Owner JIANGSU HENGKE ADVANCED MATERIALS CO LTD
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