Method for preparing low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning

A low-melting polyester and composite fiber technology, applied in fiber processing, stretch spinning, conjugated synthetic polymer rayon, etc., can solve the problems of low production efficiency, difficult to guarantee product quality, high cost, and achieve molding Good, improve production efficiency, reduce production costs

Active Publication Date: 2015-11-18
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application did not adopt the method of melt direct spinning, the production...

Method used

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  • Method for preparing low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning
  • Method for preparing low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. The slurry prepared by terephthalic acid, isophthalic acid, ethylene glycol and antimony series catalyst, the molar ratio of acid and alcohol in the slurry is 1:1.05;

[0040] 2. The obtained slurry is continuously and uniformly transported to the esterification system composed of the vertical first esterification kettle and the vertical second esterification kettle for esterification reaction. The reaction temperature of the first esterification kettle is 265°C and the reaction pressure is is 200kPa, the reaction temperature of the second esterification kettle is 270°C, and the reaction pressure is 120kPa. When the esterification rate of the esterified product reaches 96%, the terephthalic acid / isophthalic acid / ethylene glycol ternary oligomer is continuously and stably pumped out from the esterification kettle through the oligomer pump;

[0041] 3. The oligomer obtained in step 2 and the polyether component polyethylene glycol 100 injected into the oligomer pipelin...

Embodiment 2

[0049] 1. The slurry prepared by terephthalic acid, succinic acid, butanediol and titanium-based catalyst, the molar ratio of acid to alcohol in the slurry is 1:1.4;

[0050] 2. The obtained slurry is continuously and uniformly transported to an esterification system composed of a vertical esterification kettle for esterification reaction. The reaction temperature is 230°C and the reaction pressure is 300kPa. When the esterification rate of the esterified product reaches 96%, the terephthalic acid / succinic acid / butanediol ternary oligomer is continuously and stably pumped out from the esterification kettle through the oligomer pump;

[0051] 3. The oligomer obtained in step 2 and the polyether component polytetramethylene glycol 1000 injected into the oligomer pipeline are mixed evenly by the tubular static mixer arranged on the pipeline and then enter the homogenizer to carry out the transesterification reaction; wherein , the reaction temperature of the homogenizing kettle i...

Embodiment 3

[0059] 1. The slurry prepared by terephthalic acid, adipic acid, propylene glycol and titanium-based catalyst, the molar ratio of acid to alcohol in the slurry is 1:1.4;

[0060]2. The obtained slurry is continuously and uniformly transported to the esterification system composed of the vertical first esterification kettle and the horizontal second esterification kettle for esterification reaction. The reaction temperature of the first esterification kettle is 250°C and the reaction pressure is is 200kPa, the reaction temperature of the second esterification kettle is 255°C, and the reaction pressure is 100kPa. When the esterification rate of the esterified product reaches 95%, the terephthalic acid / adipic acid / propylene glycol tertiary oligomer is continuously and stably pumped out from the second esterification kettle through the oligomer pump;

[0061] 3. The oligomer prepared in step 2 and the polyether component polypropylene glycol 5000 injected into the oligomer pipelin...

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Abstract

The invention relates to a method for preparing a modified copolyester composite fiber, in particular to a method for preparing a low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning. The method comprises the following steps: slurry is prepared from raw materials in proportion and added continuously into an esterification system for an esterification reaction, an obtained oligomer is uniformly mixed with polyether, the mixture enters a homogenizing kettle for transesterification and pre-polycondensation, a product is uniformly mixed with a chain extender for final polycondensation, and an obtained low-melting-point polyester melt and a common polyester melt enter a composite spinning assembly to prepare the low-melting-point polyester composite fiber which comprises a common polyester core layer and a low-melting-point polyester cortex layer. The method has the advantages as follows: a side reaction of thermal degradation of polyether components is inhibited effectively, and the color and spinnability of the low-melting-point polyester melt are improved; the problem of poor performance of composite spinning of the low-melting-point polyester on the cortex layer and the common polyester on the core layer due to large dynamic viscosity difference of the melt is solved, and the composite fiber is well formed; the production efficiency of the low-melting-point polyester composite fiber is improved.

Description

technical field [0001] The present invention relates to a preparation method of modified copolyester composite fiber, in particular to a preparation method of continuous polymerization melt direct spinning low melting point polyester composite fiber. Background technique [0002] Low melting point polyester composite fiber is a thermal bonding fiber widely used in the field of non-woven fabrics. The use of low-melting polyester composite fibers in non-woven fabrics can reduce pollution and reduce costs because no chemical binders are used. At the same time, the inherent network structure of non-woven fabrics can be maintained to give full play to the physical and chemical properties of the main fibers. , so that the non-woven fabric produced is stronger than the needle-punched non-woven fabric. Moreover, compared with polyolefin and polyamide thermal bonding fibers, low-melting polyester composite fibers as thermal bonding fibers have more advantages in terms of feel, price...

Claims

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Application Information

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IPC IPC(8): D01F8/14C08G63/672C08G63/685C08G63/688C08G63/692D01D5/34D01D5/40D01D5/16D01D10/02
Inventor 邱志成金剑
Owner CHINESE TEXTILE ACAD
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