Preparation method of low-temperature dyeable composite elastic fiber

A composite elastic fiber, low temperature technology, used in fiber processing, conjugated synthetic polymer rayon, filament/thread forming, etc., can solve the problems of uneven stripes, uneven coloring, defective products, etc. The effect of uniform coloring, uniform color and good elasticity retention

Pending Publication Date: 2022-06-07
ZHOUSHAN XINXIN CHEM FIBER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dyeing temperature difference between the two is nearly 40°C, which leads to the PBT/PET side-by-side self-crimping composite fibers prepared by this method, and the dyeing often has different colors and uneven coloring, that is, under the same dyeing conditions, the PBT component The deep color and the light color of the PET component cause color difference between the two sides of the same th

Method used

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  • Preparation method of low-temperature dyeable composite elastic fiber
  • Preparation method of low-temperature dyeable composite elastic fiber
  • Preparation method of low-temperature dyeable composite elastic fiber

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0043] Example 1

[0044] (1) Using terephthalic acid, ethylene glycol isophthalate, ethylene glycol, and 1,4-butanediol as raw materials for the first step of esterification reaction, the feeding time is 3.0h, and the temperature is 255~ 258°C, the esterification rate is 95-96%; then add polyethylene glycol, and a composite stabilizer of triphenyl phosphate, organic silicon quaternary ammonium salt, and sodium acetate to carry out the second-step polycondensation reaction, and the reaction time in a low vacuum 50min, high vacuum reaction time 4.0h, polycondensation temperature 288-290°C, pressure not higher than 70Pa, obtained modified low-viscosity polyester slices dyed at low temperature and normal pressure, viscosity 0.47dl / g, as component A.

[0045] (2) Use 1,4-butanediol, terephthalic acid, catalyst and polyamide nucleating agent to carry out esterification (temperature 240-242°C, pressure 40-45KPa, residence time 2.5-3.0h), pre- Polycondensation (temperature 242-244°C...

Example Embodiment

[0048] Example 2

[0049] (1) Using terephthalic acid, dihydroxyethyl isophthalate-5-sodium sulfonate, isophthalic acid, ethylene glycol, and 1,3-propanediol as raw materials for the first-step esterification reaction, the feed The time is 3.5h, the temperature is 257-258°C, and the esterification rate is 94-95%; then polyoxypropylene glycol, and a composite stabilizer of triphenyl phosphate, organic silicon quaternary ammonium salt and sodium acetate are added to carry out In the second step of polycondensation reaction, low vacuum reaction time is 50min, high vacuum reaction time is 4.5h, polycondensation temperature is 288-290°C, pressure is not higher than 70Pa, and modified low-viscosity polyester chips dyed at low temperature and normal pressure are obtained, with a viscosity of 0.49dl / g, as component A.

[0050] (2) Use 1,4-butanediol, terephthalic acid, catalyst and polyamide nucleating agent to carry out esterification (temperature 240-242°C, pressure 40-45KPa, resi...

Example Embodiment

[0053] Example 3

[0054] (1) Using terephthalic acid, diethyl isophthalate, sebacic acid, ethylene glycol, and 1,6-hexanediol as raw materials for the first step of esterification reaction, the feeding time is 4.0h, and the temperature The temperature is 255-256°C, and the esterification rate is 92-93%; then polytetrahydrofuran diol, and a composite stabilizer of triphenyl phosphate, organic silicon quaternary ammonium salt and sodium acetate are added to carry out the second-step polycondensation reaction, low The vacuum reaction time is 50 minutes, the high vacuum reaction time is 5.0 hours, the polycondensation temperature is 288-290 ° C, and the pressure is not higher than 70 Pa. The modified low-viscosity polyester chips dyed at low temperature and normal pressure with a viscosity of 0.54 dl / g are obtained as component A.

[0055] (2) Use 1,4-butanediol, terephthalic acid, catalyst and polyamide nucleating agent to carry out esterification (temperature 240-242°C, pressur...

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Abstract

The preparation method of the low-temperature dyeable composite elastic fiber comprises the following steps: preparing a PET (Polyethylene Terephthalate) slice and a PBT (Polybutylece Terephthalate) slice; respectively putting the slices into a parallel composite spinning device, respectively melting and flowing to a spinning mechanism; co-extruding from a spinneret orifice; the extruded mixed yarn is subjected to drafting, side blowing, heat setting and winding; when the PET slices are manufactured, a component C, namely meta-position aromatic dicarboxylic acid or esters thereof, is also added to increase the distance between PET macromolecules, and meanwhile, the PBT slices are formed by liquid phase tackifying in a polycondensation kettle in the polymerization process or solid phase tackifying after polymerization and have the viscosity of 0.9-1.25 dl/g; in the extrusion process, the PET is adhered to the PBT for co-extrusion. The method has the advantages that the composite elastic fiber produced by the method has the characteristics of dyeability at low temperature and normal pressure, uniform coloring and high curling elasticity, and the prepared elastic fabric has the characteristics of uniform color and good elasticity retentivity.

Description

technical field [0001] The invention relates to the technical field of making elastic fibers, in particular to a method for preparing low-temperature dyeable composite elastic fibers. Background technique [0002] Polybutylene terephthalate (PBT), compared with its homologues polyethylene terephthalate (PET) and trimethylene terephthalate (PTT), has a softer molecular chain, And it has the elasticity similar to PTT, the glass transition temperature is 40-50°C, the melting point is 225-235°C, and can be dyed at low temperature and normal pressure, while the glass transition temperature of conventional PET is 67-81°C, the melting point is 250-260°C, and the macromolecular structure is tight , there is a lack of groups that adsorb ionic dyes in the molecule, so it is difficult to dye, and disperse dyeing requires high temperature or the addition of a carrier. Due to the different heat resistance properties of PET and PBT, when they encounter high temperature, the heat shrinkag...

Claims

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Application Information

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IPC IPC(8): D01F8/14C08G63/16C08G63/183C08G63/688D01D5/32
CPCD01F8/14C08G63/16C08G63/183C08G63/6886D01D5/32
Inventor 张正松李达沈安昌吕继红李宏陈和松
Owner ZHOUSHAN XINXIN CHEM FIBER
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