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
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[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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