A kind of porous superfine denier flat yarn and its preparation method

A technology of ultra-fine denier and flat yarn, applied in the field of polyester fibers, can solve the problems of poor mechanical properties and uneven dyeing of polyester fibers, and achieve the effects of improving processing performance, improving dyeing performance, and reducing melt viscosity

Active Publication Date: 2018-09-14
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problems of uneven dyeing and poor mechanical properties of existing polyester fibers, realize large-scale production and spinning, and provide a method for preparing porous ultra-fine denier flat yarns

Method used

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  • A kind of porous superfine denier flat yarn and its preparation method
  • A kind of porous superfine denier flat yarn and its preparation method
  • A kind of porous superfine denier flat yarn and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A preparation method of modified polyester, specifically comprising the following steps:

[0064] (1) Preparation of glycol terephthalate:

[0065] Put terephthalic acid and 2-pentyl-1,3 propanediol with a molar ratio of 1:1.3 into a slurry and add it to the reactor at a concentration of 50 wt%, and the addition amount is 0.3% of the weight of terephthalic acid. Under the catalysis of sulfuric acid, esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is normal pressure and the temperature is 180°C. Time is the end point of the esterification reaction to obtain diol terephthalate;

[0066] (2) Preparation of ethylene terephthalate:

[0067] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.2 and put them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is nor...

Embodiment 2

[0075] The preparation method of the modified polyester of embodiment 2, wherein the preparation process of modified polyester is with embodiment 1, wherein main technical parameter is referring to table 1; After step (3) adds glycol terephthalate, Stirring and mixing for 16 minutes, under the action of 0.011% catalyst antimony trioxide of the total weight of terephthalic acid and 0.02% of the stabilizer triphenyl phosphate of the total weight of terephthalic acid, under negative Start the polycondensation reaction in the low vacuum stage under the condition of high pressure, the pressure in this stage is steadily pumped from normal pressure to the absolute pressure of 490Pa, the temperature is controlled at 262 ° C, and the reaction time is 31 minutes; then continue to vacuumize and carry out the polycondensation reaction in the high vacuum stage. The reaction pressure was reduced to an absolute pressure of 90 Pa, the reaction temperature was controlled at 276° C., and the rea...

Embodiment 3

[0078] The preparation method of the modified polyester of embodiment 3, wherein the preparation process of modified polyester is with embodiment 1, wherein main technical parameter is referring to table 1; After step (3) adds glycol terephthalate, Stirring and mixing for 16 minutes, under the action of the 0.03% catalyst antimony trioxide and the 0.02% stabilizer triphenyl phosphate of the terephthalic acid gross weight in an add-on, under negative Start the polycondensation reaction in the low vacuum stage under the condition of high pressure, the pressure in this stage is steadily pumped from normal pressure to the absolute pressure of 498Pa, the temperature is controlled at 263 ° C, and the reaction time is 32 minutes; then continue to vacuumize and carry out the polycondensation reaction in the high vacuum stage. The reaction pressure was reduced to an absolute pressure of 90 Pa, the reaction temperature was controlled at 277° C., and the reaction time was 57 minutes to pr...

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Abstract

The invention relates to a porous superfine denier flat yarn and a preparation method thereof. Modified polyester is spun by a porous spinneret plate to prepare the porous superfine denier flat yarn; the arrangement form of spinneret holes in the porous spinneret plate is in an ellipse, namely that the hole center of each spinneret hole is positioned on concentric ellipses, the concentric ellipses are a series of ellipses, the long axes of all the ellipses are collinear, and the short axes of all the ellipses are collinear. The modified polyester is subjected to slicing, solid-phase polycondensation and viscosity increasing, so as to prepare the porous superfine denier flat yarn. A preparation method of the modified polyester comprises the following steps of reacting terephthalic acid and ethylene glycol to prepare ethylene terephthalate; adding ethylene terephthalate prepared by reaction of terephthalic acid and branch chain-containing ethylene glycol, and continuously reacting, so as to prepare the ethylene terephthalate; continuing to react, so as to obtain the modified polyester. The porous superfine denier flat yarn has the advantages that the prepared fiber property is excellent; the linear density deviation is smaller than or equal to 0.5%, a break strength CV (coefficient of variation) value is smaller than or equal to 4.0%, a break elongation CV value is smaller than or equal to 8.0%, and a yarn unevenness CV value is smaller than or equal to 2.0%.

Description

technical field [0001] The invention belongs to the field of polyester fibers and relates to a porous ultrafine denier flat yarn and a preparation method thereof. Background technique [0002] Since its inception, polyethylene terephthalate (PET fiber or polyester fiber) fiber has high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance. It has a series of excellent performances, such as anti-wrinkle and non-ironing, and good crispness. It is widely used in clothing, home textiles and other fields. [0003] However, due to the high crystallinity and compact structure of PET, and there is no functional group combined with the dye on the molecular chain, it is difficult for the dye molecule to enter the fiber and dyeing is difficult. Can't satisfy people to bright-coloured beautiful, the fabric demand of unique style. [0004] The reason for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/84C08G63/183C08G63/78D01D5/247D01D5/253D01D5/08
CPCC08G63/183C08G63/78D01D5/08D01D5/247D01D5/253D01F6/84
Inventor 范红卫尹立新罗凯敏张元华王小雨杨超明
Owner JIANGSU HENGLI CHEM FIBER
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