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Spandex unwinding aid with excellent unwinding performance and preparation and application method thereof

An application method, the technology of spandex, is applied in rayon manufacturing, textile and paper making, single-component synthetic polymer rayon, etc., and can solve the increasingly serious volatilization of oil agent on the surface of silk cake, poor unwinding, and polymer swelling And other issues

Active Publication Date: 2021-05-04
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, the current method of oil removal is basically under alkaline conditions. This process not only has a poor oil removal effect, but also causes certain damage to the spandex fabric, and at the same time, it also affects the dyeing process. cause unnecessary trouble
To sum up, the oil agent cannot completely solve all the forming and unwinding problems encountered in actual production, and it will also bring adverse effects to the subsequent processing
At present, the methods used by researchers to solve the poor forming and unwinding of spandex elastic fibers are generally to add an appropriate amount of magnesium stearate to the polyurethane polymer solution and coat the spandex filaments with oil. This method has the following Problems: ①Increasing the content of magnesium stearate may lead to failures in the production of spandex elastic fibers; ②With the prolongation of the silk cake storage time, the volatilization of the oil agent on the surface layer of the silk cake becomes more and more serious, and the mineral oil in the oil agent in the inner layer of the silk cake will Immersed in the filament, causing polymer swelling, sticking of the filament cake, etc.
[0007] Patent CN102534857A "Preparation Method of Polyurethane Elastic Fiber with Improving Unwinding Property" adopts the addition of 0.2% to 1.0% silicone oil to solve the problem of unsmooth unwinding when the spandex is left for too long

Method used

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  • Spandex unwinding aid with excellent unwinding performance and preparation and application method thereof
  • Spandex unwinding aid with excellent unwinding performance and preparation and application method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0036] 1) Preparation of unwinding aid for spandex:

[0037] ① Add solvent DMAc, polytetrahydrofuran glycol (PTMG), and long-chain carbon alcohols in turn in the reaction tank, and add diphenylmethane diisocyanate (4,4-MDI) according to the set NCO / OH ratio; the reaction temperature is controlled as 40~50℃, the reaction time is 90~150min, nitrogen protection during the reaction process, to obtain polymer solution A;

[0038] ②Cool the obtained polymer A to 5-15°C, add the DMAc solution of long-chain carbon alcohol or amine, fully stir the reaction, and obtain a certain concentration of unwinding aid for spandex;

[0039] 2) The auxiliary agent is added to the spandex stock solution in the form of functional auxiliary materials, stirred evenly, matured, and spun to obtain a spandex product with excellent unwinding performance.

[0040] A spandex with excellent unwinding performance and its preparation method according to claim 1, characterized in that: the polytetrahydrofuran ...

Embodiment 1

[0046] The unwinding aid for spandex with excellent unwinding performance of the present invention and its preparation and application method are as follows:

[0047] 1) Preparation of unwinding aid for spandex:

[0048] ① Add 8.600kg DMAc, 2.500kg PTMG (Mn is 250), 2.705kg octadecyl alcohol in sequence in the reaction tank, and add 5.000kg MDI according to the NCO / OH molar ratio of 2:1; the reaction temperature is controlled at 50°C, and the reaction The time is 120min, nitrogen protection in the reaction process, obtain polymer solution A;

[0049] ② Cool the obtained polymer A to 10° C., add 2.695 kg of octadecylamine-containing DMAc solution (concentration: 15.0%), fully stir and react, and obtain the unwinding aid for spandex with a concentration of 35.0%;

[0050] 2) The auxiliary agent is added to the spandex stock solution with a mass fraction of 2.5% in the form of functional auxiliary materials, stirred evenly, matured, and spun to obtain a spandex product with exce...

Embodiment 2

[0052] The unwinding aid for spandex with excellent unwinding performance of the present invention and its preparation and application method are as follows:

[0053] 1) Preparation of unwinding aid for spandex:

[0054] ① Add 8.300kg DMAc, 5.000kg PTMG (Mn is 500), 2.421kg hexadecanol in sequence in the reaction tank, and add 5.000kg MDI according to the NCO / OH molar ratio of 2:1; the reaction temperature is controlled at 45°C, and the reaction The time is 120min, nitrogen protection in the reaction process, obtain polymer solution A;

[0055] ② Cool the obtained polymer A to 10° C., add 2.705 kg of stearyl alcohol-containing DMAc solution (concentration 10.0%), fully stir and react to obtain a 35.0% concentration of unwinding aid for spandex;

[0056] 2) The auxiliary agent is added into the spandex stock solution with a mass fraction of 3.5% in the form of functional auxiliary materials, stirred evenly, matured, and spun to obtain a spandex product with excellent unwinding...

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Abstract

The invention relates to a spandex unwinding aid with excellent unwinding performance and its preparation and application method. The preparation method is as follows: adding solvent DMAc, polytetrahydrofuran glycol (PTMG) and long-chain carbon alcohol into a reaction tank , after stirring evenly, accurately add diphenylmethane diisocyanate (4,4-MDI) according to the set ratio, after the reaction is over, add long straight-chain carbon alcohol / amine DMAc solution, fully react, and finally obtain a certain concentration of spandex The unwinding auxiliary agent is directly used in the spandex production process to obtain spandex products with excellent unwinding performance. The unwinding auxiliary agent for spandex prepared by the invention can not only guarantee the performance index of similar conventional products, but also endow it with excellent forming and unwinding performance.

Description

technical field [0001] The invention relates to an unwinding auxiliary agent for spandex with excellent unwinding performance and a preparation and application method thereof, belonging to the technical field of polyurethane elastic fiber manufacturing. Background technique [0002] Spandex, a highly elastic textile fiber, has the advantages of high strength, light specific gravity, and large elastic recovery rate at room temperature, and is widely used in fabrics. With the rapid development of textile technology, the production process and technology of polyurethane elastic fiber - spandex are constantly updated, and are constantly improving in the direction of green environmental protection, energy saving and emission reduction. For example: using DMAc solvent with low toxicity to replace the more toxic DMF solvent; using advanced technologies such as high concentration and high-speed spinning to achieve the purpose of low energy consumption and high efficiency. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/28C08G18/12D01F6/94D01F1/10
Inventor 邵晓林杨晓印温作杨池晓智孔懿阳毛植森许图远蒋曙
Owner ZHEJIANG HUAFENG SPANDEX