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Melt direct spinning porous superfine polyester fiber and preparation method thereof

A technology of superfine polyester fiber and melt direct spinning, applied in the field of polyester spinning, can solve the problems affecting the quality of melt direct spinning porous superfine polyester fiber, short replacement cycle of filters and spinning components, etc. Achieve excellent breaking strength and elongation at break, improve filtration performance, and extend the effect of replacement cycle

Pending Publication Date: 2022-03-01
JIANGSU HENGKE ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing preparation method, in order to improve the quality of the melt direct spinning porous ultrafine polyester fiber, the filtration precision of the filter and the spinning assembly is very high, but because terephthalic acid contains a certain amount of p-carboxybenzaldehyde, it will The replacement cycle of filters and spinning components is short, and it also affects the quality of the prepared melt direct spinning porous ultrafine polyester fiber

Method used

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preparation example Construction

[0043] For this reason, the present invention provides a kind of preparation method of melt direct spinning porous superfine polyester fiber, specifically, in terephthalic acid and ethylene glycol esterification reaction, add sodium borohydride, after esterification reaction, then Melt direct spinning porous superfine polyester fiber is obtained through polycondensation reaction and spinning process.

[0044] Specifically, the preparation method includes:

[0045] S1. Make a slurry of terephthalic acid and ethylene glycol, add sodium borohydride, catalyst and stabilizer and mix evenly, and then carry out esterification reaction. The temperature of the esterification reaction is 200-260°C, and the time is 120-180min. , during the esterification reaction, the temperature gradually increased from 200°C to 260°C and finally kept at 260°C;

[0046] S2. After the esterification reaction is completed, the polycondensation reaction is carried out under negative pressure conditions be...

Embodiment 1

[0073] Step 1. Make a slurry of terephthalic acid and ethylene glycol, add sodium borohydride, catalyst and stabilizer and mix evenly, and then carry out esterification reaction. The temperature of the esterification reaction is 220-260° C., and the time is 120 minutes. During the esterification reaction, the esterification temperature is a process of gradually increasing the temperature, and the temperature gradually rises from 200°C to 260°C and is finally maintained at 260°C.

[0074] The molar ratio of terephthalic acid and ethylene glycol is 1:1.3;

[0075] The addition amount of catalyst antimony trioxide is 0.01% of the weight of terephthalic acid; the addition amount of sodium borohydride is 30 ppm of the weight of terephthalic acid; the addition amount of stabilizer triphenyl phosphate is 0.01% of the weight of terephthalic acid. %.

[0076] Step 2: After the esterification reaction is completed, the polycondensation reaction is carried out under a negative pressure ...

Embodiment 2

[0089] Step 1. Make a slurry of terephthalic acid and ethylene glycol, add sodium borohydride, catalyst and stabilizer and mix evenly, then carry out esterification reaction. The temperature of the esterification reaction is 220-260° C. and the time is 180 minutes. During the esterification reaction, the esterification temperature is a process of gradually increasing the temperature, and the temperature gradually rises from 200°C to 260°C and is finally maintained at 260°C.

[0090] The molar ratio of terephthalic acid and ethylene glycol is 1:1.5;

[0091] The addition of catalyst ethylene glycol antimony is 0.02% of the weight of terephthalic acid; the addition of sodium borohydride is 50ppm of the weight of terephthalic acid; the addition of stabilizer trimethyl phosphate is 0.03% of the weight of terephthalic acid %.

[0092] Step 2: After the esterification reaction is completed, the polycondensation reaction is carried out under negative pressure conditions with an abso...

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Abstract

The invention relates to a melt direct-spinning porous superfine polyester fiber and a preparation method thereof, sodium borohydride is added in esterification reaction of terephthalic acid and ethylene glycol, after esterification reaction, the melt direct-spinning porous superfine polyester fiber is obtained through condensation polymerization and a spinning process; wherein the addition amount of the sodium borohydride is 30-50ppm of the weight of terephthalic acid, and due to the reaction characteristics and chemical selectivity of the sodium borohydride, the sodium borohydride reacts with p-carboxybenzaldehyde in the terephthalic acid before esterification in polyester synthesis to generate p-carboxybenzyl alcohol, so that a net structure formed by the p-carboxybenzaldehyde in the polyester synthesis process is eliminated; according to the melt direct-spinning porous superfine polyester fiber, the filtering performance of polyester melt is improved, the quality of the porous superfine polyester fiber is guaranteed, the replacement period of a filter and a spinning assembly is prolonged, and the prepared melt direct-spinning porous superfine polyester fiber has excellent breaking strength and breaking elongation performance.

Description

technical field [0001] The invention relates to a melt direct spinning porous ultrafine polyester fiber and a preparation method thereof, belonging to the field of polyester spinning. Background technique [0002] Porous ultrafine fiber is a mainstream development of differential fiber at present, and it is also an important product in the development of differential fiber. The fabric made of porous microfiber has characteristics and styles that cannot be compared with conventional chemical fibers and natural fibers, the most prominent of which is good softness and more silky feeling. [0003] Due to the fine structure of porous ultrafine fibers, the number of fibers in the fabric increases, which brings about the "micro air chamber" effect and improves the warmth retention and sound insulation of the fabric. Moreover, the porous microfiber has a large specific surface area, which is conducive to improving the hygroscopicity of the fabric, and has obvious and special capill...

Claims

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Application Information

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IPC IPC(8): D01F6/62D01D1/09C08G63/183C08G63/78
CPCD01F6/62D01D1/09C08G63/183C08G63/78
Inventor 柴森光赵军黄喆王亚松范春民郝沙沙
Owner JIANGSU HENGKE ADVANCED MATERIALS CO LTD
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