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Method for preparing ultrafine contractible controllable copolyester fiber by adopting direct esterification polycondensation method

A copolyester and superfine technology, applied in the textile field, can solve problems such as abnormal production, low spinning melting temperature, and decreased rheological properties of the melt, and achieve stability, simple process, and convenient operation. Effect

Active Publication Date: 2013-09-11
苏州新民纺织有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melting point of this modified polyester chip is low, and the spinning melting temperature is correspondingly low, and the thermal degradation is serious at a higher temperature, and the production cannot be carried out normally.
However, at too low spinning temperature, the melt rheological properties decrease, especially when the fine denier yarn is spun, the wool yarn increases significantly

Method used

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  • Method for preparing ultrafine contractible controllable copolyester fiber by adopting direct esterification polycondensation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add terephthalic acid and isophthalic acid into ethylene glycol under stirring, and perform esterification reaction at 245-260°C to obtain esterified products. The temperature at the top of the split column is controlled at 100°C; Dicarboxylic acid is 5 mol% of the content of terephthalic acid, and the molar ratio of the sum of isophthalic acid and terephthalic acid to ethylene glycol is 1:2;

[0019] (2) Copolymerize the obtained esterification product with polyethylene glycol, react for 2-4 hours, and the final temperature of polycondensation is 285-295°C to obtain copolyesters with different shrinkage rates. Polyethylene glycol consumption accounts for 1wt% of esterification product;

[0020] (3) Pre-crystallize and dry the copolyester, and melt and extrude it through a screw extruder. The relevant production process conditions are shown in Table 1;

[0021] (4) Draw and wind with 20 heads of high-speed spinning equipment with three hot rollers. See Table 1 for ...

Embodiment 2

[0024] (1) Add terephthalic acid and isophthalic acid into ethylene glycol under stirring, and carry out esterification reaction at 245-260°C to obtain esterified products. The temperature at the top of the split column is controlled at 100-110°C; Isophthalic acid is 13 mol% of the content of terephthalic acid, and the molar ratio of the sum of isophthalic acid and terephthalic acid to ethylene glycol is 1:2;

[0025] (2) Copolymerize the obtained esterification product with polyethylene glycol, react for 2-4 hours, and the final temperature of polycondensation is 285-295°C to obtain copolyesters with different shrinkage rates. Polyethylene glycol consumption accounts for 1.3wt% of esterification product;

[0026] (1) Pre-crystallize and dry the copolyester, and melt and extrude it through a screw extruder. The relevant production process conditions are shown in Table 1;

[0027] (2) Draw and wind with 20 heads of high-speed spinning equipment with three hot rollers. See Tabl...

Embodiment 3

[0031] (1) Add terephthalic acid and isophthalic acid to ethylene glycol under stirring, and carry out esterification reaction at 252°C to obtain esterified products. The temperature at the top of the split column is controlled at 100°C; isophthalic acid It is 3mol% of the content of terephthalic acid, and the molar ratio of the sum of isophthalic acid and terephthalic acid to ethylene glycol is 1:2;

[0032] (2) Copolymerize the obtained esterification product with polyethylene glycol, react for 2-4 hours, and the final temperature of polycondensation is 285-295°C to obtain copolyesters with different shrinkage rates. Polyethylene glycol consumption accounts for 0.8wt% of esterification product;

[0033] (3) Pre-crystallize and dry the copolyester, and melt and extrude it through a screw extruder. The relevant production process conditions are shown in Table 1;

[0034] (4) Draw and wind with 20 heads of high-speed spinning equipment with three hot rollers. See Table 2 for t...

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Abstract

The invention relates to a method for preparing ultrafine contractible controllable copolyester fiber by adopting a direct esterification polycondensation method. The method is characterized by comprising the steps of: adding terephthalic acid and isophthalic acid into ethylene glycol for esterification; copolymerizing the esterified product with ethylene glycol to prepare copolyester with different contraction percentages; precrystalizing and drying the copolyester, melting and extruding through a screw extruder, and drafting and winding by utilizing three-hot-roll 20-head high-speed spinning equipment. The product can be used for producing ultrafine fibers with total fiber number of 20-30dtex or filament number of 0.3-0.5dtex, and the contraction percentage can be adjusted within 15-70%.

Description

[0001] technical field [0002] The invention belongs to the field of textiles, and in particular relates to a method for preparing superfine shrinkage controllable copolyester fibers by direct esterification and polycondensation. Background technique [0003] Clothes made of polyester fibers are crisp, easy to wash and dry quickly, but they also have disadvantages, so they need to be modified. Commonly used modification methods in production include copolymerization modification and blending modification. Copolymerization modification can introduce useful chemical groups into the macromolecular chain, but more importantly, it is to change the physical properties and aggregated structure of polyester. The blending also changes the physical properties and aggregated structure of the polyester by mixing other polymers, thereby changing the performance of the polyester. Some domestic enterprises and scientific research departments add isophthalic acid (IPA) and neopentyl gly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/84C08G63/672C08G63/78
Inventor 戴礼兴戴建平任军杨晓春张振雄李改王建军
Owner 苏州新民纺织有限公司
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