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Preparation method of continuous polymerization melt direct spinning low melting point polyester composite fiber

A low-melting point polyester and composite fiber technology, applied in fiber processing, stretch spinning, conjugated synthetic polymer artificial filament, etc., can solve problems such as low production efficiency, high cost, and difficulty in product quality assurance, and achieve Good molding, improved production efficiency, and guaranteed stability

Active Publication Date: 2017-06-30
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application did not adopt the method of melt direct spinning, the production efficiency is low, the cost is high, and the product quality is difficult to guarantee

Method used

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  • Preparation method of continuous polymerization melt direct spinning low melting point polyester composite fiber
  • Preparation method of continuous polymerization melt direct spinning low melting point polyester composite fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. A slurry formulated with terephthalic acid, isophthalic acid, ethylene glycol and antimony-based catalysts. The molar ratio of acid to 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 first vertical esterification tank and the second vertical esterification tank for esterification reaction. The reaction temperature of the first esterification tank is 265 °C and the reaction pressure is is 200kPa, the reaction temperature of the second esterification tank 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 of the esterification tank through the oligomer pump;

[0041] 3. The oligomer obtained in step 2 is mixed with the polyether component Polyethylene Glycol 100 injected into the oligomer pipelin...

Embodiment 2

[0049] 1. A slurry formulated with terephthalic acid, succinic acid, butanediol and a 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 vertical esterification tanks for esterification reaction, with a reaction temperature of 230° C. and a reaction pressure of 300 kPa. 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 tank by the oligomer pump;

[0051] 3. The oligomer obtained in step 2 is mixed with the polyether component polytetramethylene glycol 1000 that is injected into the oligomer pipeline through a tubular static mixer arranged on the pipeline and then enters a homogeneous kettle for transesterification; wherein , the reaction temperature of the homogeneous kettle is 230°C, and th...

Embodiment 3

[0059] 1. A slurry formulated with terephthalic acid, adipic acid, propylene glycol and a 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 consisting of a vertical first esterification tank and a horizontal second esterification tank for esterification reaction. The reaction temperature of the first esterification tank is 250°C and the reaction pressure is is 200kPa, the reaction temperature of the second esterification tank 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 ternary oligomer is continuously and stably pumped out from the second esterification kettle by the oligomer pump;

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

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Abstract

The 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. The steps are: prepare the raw materials into slurry in proportion, then continuously add them into the esterification system for esterification reaction, mix the obtained oligomer and polyether evenly, and then enter the homogeneous kettle for ester exchange reaction, precondensation reaction, Mix with the chain extender evenly for final polycondensation reaction, and the obtained low-melting point polyester melt and conventional polyester melt enter the composite spinning assembly to obtain a low-melting point polyester compound in which the core layer is conventional polyester and the skin layer is low-melting point polyester. fiber. The invention effectively suppresses the thermal degradation side reaction of the polyether component, improves the hue and spinnability of the low melting point polyester melt; overcomes the problem of the low melting point polyester of the cortex and the core layer caused by the large difference in the dynamic viscosity of the melt The problem of poor spinning performance of conventional polyester composites makes the composite fibers well formed; improves the production efficiency of low melting point polyester composite fibers.

Description

technical field [0001] The 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 kind of thermal bonding fiber widely used in the field of nonwovens. The use of low-melting point polyester composite fibers in non-woven fabrics can reduce pollution and cost due to the absence of chemical binders, while maintaining the inherent network structure of non-woven fabrics and fully utilizing the physical and chemical properties of the main fibers , so that the produced non-woven fabric is stronger than the needle-punched non-woven fabric. Moreover, compared with polyolefin and polyamide thermal bonding fibers, low melting point polyester composite fibers have more advantages as thermal bonding fibers in terms of hand feeling, price and resistanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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