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A kind of cationic polyester melt production process and its application method

A cationic polyester and production process technology, applied in the field of fiber processing, can solve the problems of inability to apply cationic polyester fiber, increase production safety hazards, and volatile organic compounds affect the environment, so as to reduce molecular chain instability and benefit Effects of post-processing, improving spinnability and dyeing performance

Active Publication Date: 2022-03-18
杭州观晨实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that methanol must be used in the transesterification method, that is, the DMT method technology, volatile organic compounds will affect the environment and increase production safety hazards. Esterification but can not be applied to the problem of cationic polyester fiber production, the invention provides a kind of synthetic third monomer ethylene glycol isophthalate-5-sodium sulfonate (SIPEG) based on ethylene glycol direct esterification method ) process formula and corresponding production process, can realize the industrialized production of cationic polyester filament and short fiber

Method used

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  • A kind of cationic polyester melt production process and its application method
  • A kind of cationic polyester melt production process and its application method
  • A kind of cationic polyester melt production process and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 (production of cationic polyester melt)

[0042] (1) With isophthalic acid-5-sodium sulfonate (SIPA) as raw material, acid ion (H + ) under the catalysis of the composite catalyst produced, carry out the esterification reaction with ethylene glycol in the esterification reactor, under the condition of certain reaction temperature and stirring uniformly, finally obtain the esterified product ethylene glycol isophthalate-5- Sodium sulfonate (SIPEG); the mass of the composite catalyst added is 0.2% of the mass of ethylene glycol isophthalate-5-sodium sulfonate, and the reaction temperature in step (1) is 170-190° C.

[0043] (2) Take purified terephthalic acid as raw material, under the effect of antimony series catalyst, carry out esterification reaction with ethylene glycol in the esterification reactor, under certain reaction temperature, reaction pressure and under the uniform situation of stirring, The esterified product ethylene terephthalate (BHET) is ...

Embodiment 2-6

[0049] Others are all the same as in Example 1, except that the catalyst in step 1 or the amount of catalyst added are different, as shown in the following table:

[0050]

[0051]

[0052] For the research on the synthesis of ethylene glycol isophthalate-5-sodium sulfonate, the key is to choose a suitable catalyst, because some side reactions will occur during the chemical reaction, and the reaction time is too long to control the side reactions. From the mechanism analysis of the esterification reaction, the acid radical ion (H + ) played a catalytic role, but the actual process of the reaction will generate a large amount of reaction heat, which is not conducive to the effective control of the esterification reaction, so it is necessary to select some chemical reagents to compound the catalyst to optimize the catalytic effect. After repeated experiments and comparisons, phosphoric acid esters are preferred among phosphates, phosphoric acid esters and antimony compound...

Embodiment 7-10

[0054] Others are all the same as in Example 1, except that the intrinsic viscosity of the prepolymer in step 4 is different, as shown in the following table:

[0055]

[0056] The intrinsic viscosity of the material in the pre-condensation reactor will affect the further chemical reaction of the final polycondensation, because the polymer is also degraded in the process of continuous chain formation, that is, the molecular chain of the polymer compound will be affected by the chemical reaction heat or a very small amount of oxygen. When chemical decomposition occurs, the molecular chain will break, and the chain will continue to form while the broken chain will break. This is a special phenomenon in the process of polymer formation. The degree of decomposition can be determined by detecting the terminal carboxyl group of the material in the prepolymerization reactor. Judgment, the high side of the carboxyl end data indicates that the thermal degradation of the material is o...

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Abstract

The invention relates to the field of fiber processing of cationic polyester filaments and short fibers directly spun by melt, in particular to the synthesis of polyester third monomer ethylene glycol isophthalate-5-sodium sulfonate and ester by direct esterification The technical field of chemical synthesis such as chemical synthesis and polycondensation synthesis. A cationic polyester melt production process of the present invention comprises the following steps: (1) obtaining the esterified product ethylene glycol isophthalate-5-sodium sulfonate; (2) obtaining the esterified product ethylene terephthalate ester; (3) to obtain the mixed esterified product; (4) the mixed esterified product obtained in step (3) reaches a certain intrinsic viscosity to complete the pre-condensation reaction to obtain the pre-condensation reaction product; (5) the pre-condensation reaction product enters the final polycondensation reaction Under the action of further increasing the reaction temperature and vacuum, the intrinsic viscosity of the polymer is reached to complete the final polycondensation reaction, and the polyester melt that meets the requirements for the production of cationic polyester filaments and staple fibers by melt direct spinning is obtained.

Description

technical field [0001] The present invention relates to the field of fiber processing of melt direct spinning cationic polyester filaments and short fibers, in particular to the synthesis of polyester third monomer ethylene glycol isophthalate-5-sodium sulfonate (SIPEG) by direct esterification ), esterification synthesis, polycondensation synthesis and other processes of chemical synthesis technology. Background technique [0002] Since the advent of cationic polyester fiber, due to its excellent dyeing performance, it has been widely used in the fields of textiles, clothing and home textiles. This kind of polyester fiber has introduced cationic dyeable sodium sulfonate groups into the main chain of the macromolecule, which overcomes the problem of poly The dense structure of ester fiber and the lack of dye-friendly groups make it difficult to dye, thus providing a feasible production process route for improving the dyeing performance of polyester fiber. In 1978, DuPont of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/688D01F6/84D01D5/26D01D5/08D01D5/088D01D5/096D01D5/14
CPCC08G63/6886D01F6/84D01D5/26D01D5/08D01D5/088D01D5/096D01D5/14
Inventor 孟继承沈国锋占海华陈海忠毕少华陆坚强周君民戴建江
Owner 杭州观晨实业有限公司
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