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Preparation method of high-elongation spandex fiber

A technology of spandex fiber and polyurethane prepolymer, applied in the field of preparation of high elongation spandex fiber, can solve the problems of high production cost, decreased breaking strength, low stress and the like

Active Publication Date: 2017-05-31
华峰重庆氨纶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101736435A discloses a production method of soft spandex, by using polymeric polyols with a molecular weight greater than 3000 and side groups to prepare spandex fibers with higher elongation and lower stress, but the breaking strength is significantly reduced, which will The phenomenon that the spandex fiber breaks in the subsequent application
Chinese patent CN102154729A discloses a preparation method of high-elongation and high-draw spandex fiber, by increasing the amount of ethylenediamine in the chain extender relative to propylenediamine, thereby endowing the fiber with high elongation, high draft and low stress characteristics, but The spinning speed of this patent is low, only 600-750m / min, and the production cost is high
[0005] The above studies all involve the preparation method of high-elongation spandex, but there are certain deficiencies. Therefore, how to prepare a high-elongation spandex under the condition of high spinning speed is very important for upstream spandex production enterprises and downstream textile enterprises. significance

Method used

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Examples

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preparation example Construction

[0022] The technical scheme adopted in the preparation method of the high elongation spandex fiber of the present invention is as follows,

[0023] 1) In the pre-polymerization stage, diphenylmethane-4,4'diisocyanate and polytetrahydrofuran ether diol are mixed and reacted to obtain an isocyanate group-terminated polyurethane prepolymer;

[0024] 2) dissolving the polyurethane prepolymer obtained in step 1) with an aprotic polar solvent to obtain a prepolymer solution;

[0025] 3) After cooling the prepolymer solution prepared in step 2), adding a mixed amine solution of a chain extender and a chain terminator to carry out a chain extension reaction and a chain termination reaction to form a polyurethaneurea solution;

[0026] 4) adding various additives to the polyurethane urea solution prepared in step 3), and after fully mixing, preparing the spandex spinning solution;

[0027] 5) After maturing the prepared spandex spinning solution, dry spinning is used to obtain high-el...

Embodiment 1

[0039] (1) Put 150Kg of polytetrahydrofuran ether glycol PTMG (molecular weight 1810) and 35.03Kg of diphenylmethane-4,4'diisocyanate in the reactor, and react at 86±2°C for 120min to obtain isocyanate group-terminated pre Polymer, wherein the molar ratio of diphenylmethane-4,4'diisocyanate and polytetrahydrofuran ether glycol is 1.69:1;

[0040] (2) Add 242.749Kg of DMAC to the prepolymer to fully dissolve the prepolymer in DMAC to form a prepolymer solution;

[0041] (3) Add 3.264Kg ethylenediamine, 2.013Kg EDR-148, 0.608Kg diethylamine dissolved in 111.817Kg DMAC to the above prepolymer solution to form an amine mixed solution for chain extension reaction and chain termination React to obtain a polyurethane urea stock solution, wherein the concentration of the mixed amine solution is 5%, and the molar ratio of polyetheramine EDR-148 to aliphatic ethylenediamine is 1:4;

[0042] (4) adding matting agent, anti-yellowing agent, ultraviolet absorber, antioxidant and lubricatin...

Embodiment 2

[0045] The preparation method is the same as in Example 1, except that the molar ratio of polyetheramine EDR-148 to aliphatic ethylenediamine in step (3) is 1:9, and the apparent viscosity of the obtained product at 40°C is 4200 poise.

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Abstract

The invention discloses a preparation method of a high-elongation spandex fiber, and belongs to the technical field of high polymer material preparation. The method is especially suitable for high-speed spinning of the spandex fiber. The method comprises the following steps of (1) taking diisocyanate and oligomer dihydric alcohol as basic raw materials at a prepolymerization reaction stage to obtain an isocyanate group-terminated prepolymer; (2) dissolving the prepolymer obtained in the step (1) by using a non-protonic polar solvent to obtain a prepolymer liquid; (3) adding a mixed amine liquid prepared from a chain extender and a chain terminator to the prepolymer liquid obtained in the step (2) and carrying out prepolymerization reaction to obtain a polyurethaneurea liquid, wherein the chain extender is a mixture of polyether amine and aliphatic diamine; and (4) curing the spandex fiber prepared in the step (3) and then preparing the high-elongation spandex fiber by adopting dry spinning.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a preparation method of high-elongation spandex fiber. The spandex fiber prepared by the invention has excellent elongation performance and is particularly suitable for dry spinning at high spinning speed. Background technique [0002] Spandex is a multi-block copolymer with alternating soft and hard segments. The hard segment provides strength for the spandex fiber, and the soft segment provides elasticity for the spandex fiber. The alternating structure of soft and hard segments endows spandex fiber with high breaking strength and elasticity, thus making it widely used in various clothing items. [0003] With the application of spandex in various clothing fabrics, its market demand is also increasing year by year. While upstream spandex manufacturers are improving production efficiency and reducing costs, downstream textile manufacturers are al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10D01D5/04C08G18/76C08G18/66C08G18/48C08G18/32C08G18/28C08G18/10
CPCC08G18/10C08G18/2865C08G18/3228C08G18/4854C08G18/6685C08G18/7671D01D5/04D01F1/10D01F1/106D01F6/94
Inventor 薛士壮晋中成钱锦刘珊珊费长书杨晓印
Owner 华峰重庆氨纶有限公司
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