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Antimony-free polyester melt preparation system and method for preparing antimony-free polyester fine denier FDY fibers

An antimony-free polyester and preparation system technology is applied in the field of preparing antimony-free polyester fine denier FDY fiber and antimony-free polyester melt preparation system, which can solve the problem of molecular chain breakage, unsatisfactory spinning melt viscosity, end breakage, etc. question

Active Publication Date: 2021-04-30
ZHEJIANG HENGYI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the excessively high activity of the titanium-based catalysts in the prior art, which easily causes more side reactions during the melt conveying process, and breaks the molecular chain. Slow spinning speed, broken ends, floating filaments and other phenomena; and the titanium-based catalyst catalyzed the polyester esterification rate slowly, resulting in poor melt uniformity, and at the same time, the melt has poor heat resistance and is easy to degrade, the viscosity drops greatly, and the spinning speed is low. When producing FDY yarn, the number of natural broken yarns is high, so it is difficult to use titanium-based catalysts for direct spinning of antimony-free polyester filament melts. Provide a system for preparing antimony-free polyester melts and prepare antimony-free polyester fine deniers The method of FDY fiber, by improving the spinning process equipment and polyester molecular structure, promotes the esterification rate and esterification rate in the process of direct spinning of antimony-free polyester filament melt, improves melt fluidity, and reduces viscosity drop. , so as to effectively improve the quality of the antimony-free polyester filament

Method used

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  • Antimony-free polyester melt preparation system and method for preparing antimony-free polyester fine denier FDY fibers
  • Antimony-free polyester melt preparation system and method for preparing antimony-free polyester fine denier FDY fibers
  • Antimony-free polyester melt preparation system and method for preparing antimony-free polyester fine denier FDY fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for preparing antimony-free polyester fine-denier FDY fibers by melt direct spinning, comprising the steps of:

[0043] (1) Add terephthalic acid, ethylene glycol and 2-pentyl-1,3 propanediol into the first esterification tank to carry out a primary esterification reaction, the mass ratio of terephthalic acid and ethylene glycol is 1:0.43, 2 - The addition of pentyl-1,3 propanediol accounts for 80ppm of the polyester mass; the reaction temperature is 245°C, the pressure is 300Kpa, and the residence time is 80min;

[0044] (2) Transport the primary esterification reaction product to the esterification I chamber in the second esterification tank, flow through the esterification II chamber and the esterification III chamber in turn, and add red to the esterification II chamber through the colorant supply tank. 2ppm blueness agent and 5ppm blueness agent, add 10ppm nano-titanium dioxide to the esterification III chamber through the catalyst supply tank to carry out...

Embodiment 2

[0049] A method for preparing antimony-free polyester fine-denier FDY fibers by melt direct spinning, comprising the steps of:

[0050] (1) Add terephthalic acid, ethylene glycol and 2-pentyl-1,3 propanediol into the first esterification tank to carry out a primary esterification reaction, the mass ratio of terephthalic acid and ethylene glycol is 1:0.43, 2 - The addition of pentyl-1,3 propanediol accounts for 80ppm of the polyester mass; the reaction temperature is 245°C, the pressure is 300Kpa, and the residence time is 80min;

[0051] (2) Transport the primary esterification reaction product to the esterification I chamber in the second esterification tank, flow through the esterification II chamber and the esterification III chamber in turn, and add red to the esterification II chamber through the colorant supply tank. 2ppm blueness agent and 5ppm blueness agent, add 10ppm heterogeneous titanium-based catalyst into the esterification III chamber through the catalyst supply...

Embodiment 3

[0061] A method for preparing antimony-free polyester fine-denier FDY fibers by melt direct spinning, comprising the steps of:

[0062] (1) Put terephthalic acid, ethylene glycol and 2-pentyl-1,4 butanediol into the first esterification tank to carry out an esterification reaction, the mass ratio of terephthalic acid and ethylene glycol is 1:0.48 , the amount of 2-pentyl-1,4-butanediol added accounted for 50ppm of the polyester mass; the reaction temperature was 248°C, the pressure was 100Kpa, and the residence time was 90min;

[0063] (2) Transport the primary esterification reaction product to the esterification I chamber in the second esterification tank, flow through the esterification II chamber and the esterification III chamber in turn, and add red to the esterification II chamber through the colorant supply tank. 2ppm blueness agent and 5ppm blueness agent, add 4ppm heterogeneous titanium-based catalyst into the esterification III chamber through the catalyst supply ta...

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Abstract

The invention discloses an antimony-free polyester melt preparation system and a method for preparing antimony-free polyester fine denier FDY (Fully Drawn Yarn) fibers. The method comprises the following steps: (1) adding terephthalic acid, ethylene glycol and dihydric alcohol containing branched chains into a first esterification kettle to carry out primary esterification reaction; (2) conveying the primary esterification reaction product into a second esterification kettle, adding a coloring agent and a titanium catalyst, and carrying out secondary esterification reaction; (3) refluxing part of the secondary esterification reaction product into the first esterification kettle, and conveying the rest of the secondary esterification reaction product into a pre-polymerization kettle for reaction to obtain a pre-polycondensation product; (4) conveying the pre-polycondensation product to a final polycondensation kettle for reaction to obtain a polyester melt; and (5) carrying out melt direct spinning on the polyester melt obtained by the final polymerization kettle to obtain the antimony-free polyester fine denier FDY fiber. By improving spinning process equipment and a polyester molecular structure, the esterification rate and esterification rate in the antimony-free polyester filament melt direct spinning process are increased, the melt fluidity is improved, and the quality of the prepared antimony-free polyester filament is improved.

Description

technical field [0001] The invention relates to the technical field of chemical fiber preparation, in particular to an antimony-free polyester melt preparation system and a method for preparing antimony-free polyester fine denier FDY fibers. Background technique [0002] In 2019, the total output of chemical fiber in China has exceeded 70 million tons, accounting for more than 70% of the world, of which the output of polyester accounts for about 80% of the total output of chemical fiber. Polyester is mainly polyethylene terephthalate (PET), also known as polyester. Clothing made of it has good stiffness, is not easy to deform, is quick to wash and easy to dry, and has been used in many fields. The catalysts used to prepare PET by polycondensation are mainly antimony-containing catalysts. The antimony catalyst is reduced to metal antimony in the reaction, making the polyester gray; and antimony is a heavy metal, which is easily leached out in the dyeing process, thereby poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/78C08G63/183C08G63/85D01F6/84D01D1/00D01D1/04D01D5/08
CPCC08G63/785C08G63/78C08G63/183C08G63/85D01F6/84D01D1/00D01D1/04D01D5/08Y02W30/62
Inventor 李院院王松林王文朱莎莎胥荣威周晶晶
Owner ZHEJIANG HENGYI PETROCHEM
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