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Polyester elastic yarn and preparation method thereof

A technology of elastic yarn and polyester, applied in the fiber field, can solve problems such as insufficient dyeing and damage to the elasticity of composite yarn

Active Publication Date: 2015-04-01
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, since the dyeing temperature of PTT is 10-20°C lower than that of PET, the difficulty is that if you choose low-temperature dyeing, the dyeing of PET will not be enough; if you choose high-temperature dyeing, the elasticity of the composite yarn will be damaged.

Method used

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  • Polyester elastic yarn and preparation method thereof
  • Polyester elastic yarn and preparation method thereof

Examples

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preparation example Construction

[0069] A method for preparing polyester elastic yarn as described above, the PTT intrinsic viscosity [η] is 1.00-1.20dl / g; the modified polyester intrinsic viscosity [η] is 0.64-0.75dl / g ;.

[0070] According to the above-mentioned method for preparing polyester elastic yarn, the weight ratio of PTT to PET in the composite yarn is 4:6-6:4.

[0071] Dyeing method: the disperse dyes used for dyeing are disperse red 3B, disperse blue SE-2R disperse turquoise blue S-GL, and the fibers are dyed in high temperature and high pressure machine respectively. The fibers before dyeing were treated with nonionic surfactant at 60°C for 30 minutes. Dye dosage is 2.0% (o.w.f); dispersant NNO1.2g / L, pH value is 5, bath ratio is 1:50, dyeing at 60°C, heating up to 90°C, 100°C, 110°C, 120°C for constant temperature dyeing 1h.

[0072] The percentage of dyeing is determined by the residual liquid colorimetric method, absorbing an appropriate amount of dyeing stock solution and dyeing residual ...

Embodiment 1

[0076] A preparation method of polyester elastic yarn, comprising the following steps:

[0077] (1) Preparation of amino fatty acid ethylene glycol ester:

[0078] 1) Add dodecanedicarboxylic acid and methanol into the reactor at a molar ratio of 1:1.5, heat to 80°C under the catalysis of concentrated sulfuric acid, reflux for esterification, cool, separate and purify to obtain dodecanedicarboxylic acid Acid monomethyl ester; Described concentrated sulfuric acid refers to the sulfuric acid that mass concentration is 70%, and the concentrated sulfuric acid add-on is 3wt% of dodecane dicarboxylic acid;

[0079] 2) Dissolve the monomethyl dodecanedicarboxylate, lead tetraacetate and lithium bromide in benzene (molar ratio 1:1:1), wherein the monomethyl dodecanedicarboxylate concentration is 0.05mol / L , under a nitrogen atmosphere, react at 80 ° C, reflux, when no more gas is produced, add a certain amount of dilute sulfuric acid to react for 2 hours, then wash, purify and dry to...

Embodiment 2

[0103] A preparation method of polyester elastic yarn, comprising the following steps:

[0104] (1) Preparation of amino fatty acid ethylene glycol ester:

[0105] 1) Add pentacodecanedicarboxylic acid and methanol into the reactor in a molar ratio of 1:1.5, under the catalysis of concentrated sulfuric acid, heat to 110°C, reflux for esterification, cool, separate and purify to obtain pentacodecane Dicarboxylic acid monomethyl ester; Described concentrated sulfuric acid refers to the sulfuric acid that mass concentration is 70%, and the concentrated sulfuric acid add-on is 3wt% of pentacosane dicarboxylic acid;

[0106] 2) The monomethyl pentacodecanedicarboxylate, lead tetraacetate and lithium bromide are dissolved in benzene (molar ratio 1:1:1), wherein the concentration of monomethyl pentacodecanedicarboxylate is 0.07mol / L, under nitrogen atmosphere, react at 85°C, reflux, when no more gas is generated, add a certain amount of dilute sulfuric acid to react for 3 hours, th...

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Abstract

The invention relates to a polyester elastic yarn and a preparation method thereof. The polyester elastic yarn is a double-component parallel composite yarn prepared from PTT (Polytrimethylene Terephthalate) and modified polyester; the elongation at break of the polyester elastic yarn is 30.0+ / -3.0%, and the boiling water shrinkage is 10.0+ / -0.5%; the modified polyester is prepared from polyester and amino fatty acid gylcol ester, wherein the amino fatty acid gylcol ester is dispersed among molecular chains of polyester and is in hydrogen-bond interaction with the molecular chains of polyester, therefore, the relative positions of the amino fatty acid gylcol ester and the molecular chains of polyester can be fixed. According to the polyester elastic yarn, the free volume space among molecular chains in fibers is expanded by 20-30v / v% under a temperature of 90 to 130 DEG C; the dyeing performance of polyester can be improved and the elastic damage degree of composite yarns can be reduced by adopting the polyester elastic yarn; the polyester elastic yarn is suitable for preparing elastic fibers and elastic decorative products.

Description

technical field [0001] The invention belongs to the field of fiber technology, and relates to a polyester elastic yarn and a preparation method thereof. Background technique [0002] Since its appearance, polyethylene terephthalate (PET) fiber has developed rapidly because of its excellent performance, and its output has become the crown of synthetic fibers in the world. Polyester fiber has a series of excellent properties such as high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance, and the fabric has the advantages of wrinkle resistance and good stiffness, so , Polyester fibers are widely used in clothing, home textiles and other fields. [0003] PET is a symmetrical linear macromolecule, the molecular chain does not contain side chain groups, and its regularity is very good. Its main chain contains a rigid benzene ring and a flexible ...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01F1/10C08G63/183C08G63/78D01D5/32C07C227/18C07C229/08
Inventor 任怀林金管范王山水尹立新李峰汤方明陈明
Owner JIANGSU HENGLI CHEM FIBER
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