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Preparation method of easy-unwinding spandex

An unwinding and spandex technology, applied in the field of polyurethane elastic fiber material manufacturing, can solve problems such as settlement, mechanical properties difference, limited application fields, etc., and achieve the effects of simple steps, excellent mechanical properties, and excellent unwinding properties.

Active Publication Date: 2020-03-27
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In CN106521965A "a kind of super strong antistatic spandex spinning oil and preparation method thereof", a novel spinning oil is prepared, in which graphene is added, but graphene makes spandex yarn black, limiting its application field , at the same time, the nano effect of graphene makes it easy to agglomerate and settle in the oil tank
[0005] In CN104005235A "A Coarse Denier Silk Spinning Oil Agent", a compound formula is adopted, and alkyl phosphate is added to further improve the antistatic performance, and stearate improves the molding and unwinding of coarse denier yarns, but due to the limited surface area of ​​spandex Limitation, the oiling rate is always a bottleneck, and the ideal unwinding performance cannot be achieved
[0006] In CN104593883A "Preparation Method of High Resilience, Low Draw Differential Melt Spinning Spandex Filament", by increasing the proportion of crosslinking agent components, increasing the oiling rate and shrinkage rate to improve the shrinkage flexibility, but changing the cross-linking agent directly affects the connection of molecular chains, resulting in significant differences in mechanical properties, and the increase in oil content and retraction rate is minimal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] A kind of easy unwinding spandex of the present invention and preparation method thereof, comprises the following several steps:

[0029] Step 1. Prepolymerization: use nitrogen N 2 After exhausting the air in the reactor, slowly add PTMG to the reactor, turn on the jacket water circulation, maintain the water temperature at 30-60°C, turn on the stirring, slowly add MDI, after the addition, raise the temperature of the jacket water to 70-60°C 100°C, after 2-8 hours of reaction, the prepolymer PP is obtained;

[0030] Step 2. Chain extension: pass the above-mentioned prepolymer PP into a high-speed rotator, and pass it into DMAC at 0-15°C, dissolve until the solution is clear without turbidity, pass the above solution into the rotary reactor, and add polyamine , monoamine, the reactor is maintained at a reaction temperature of 60-100°C, and the reaction time is 15-600s to obtain a POL stock solution;

[0031] Step 3. Aging: Add functional additives (antioxidant, dyeing...

Embodiment 1

[0033] Embodiment 1 (blank group):

[0034] Use N 2 Clean the inside of the reaction kettle, turn on the jacket water circulation, maintain the water temperature at 30-60°C, start stirring, slowly add PTMG and MDI to the reaction kettle, raise the temperature to 70-100°C, react for 2-8 hours, and put the reactants Pass it into a high-speed rotator, add DMAC at 0-15°C into the rotator, dissolve until the solution is clear without turbidity, add the mixed solution into the rotary reactor, add polyamine and monoamine, and keep the reactor at 60-100°C Reaction temperature, reaction time 15-600s, get POL stock solution, add functional additives (antioxidant, dyeing auxiliaries, lubricant, anti-yellowing agent, etc.) After 600 minutes, DOPE is filtered to remove impurities, then pumped to the spinneret, dried in the tunnel to remove DMAC, soaked in high-temperature lye pool (80-100°C) (30-300s), hot air (40-70 °C) drying, cooling and shaping (10-30 °C, 10-300s), oiling to obtain s...

Embodiment 2

[0035] Embodiment 2 (low addition amount):

[0036] Use N 2 Clean the inside of the reaction kettle, turn on the jacket water circulation, maintain the water temperature at 30-60°C, start stirring, slowly add PTMG and MDI to the reaction kettle, raise the temperature to 70-100°C, react for 2-8 hours, and put the reactants Pass it into a high-speed rotator, add DMAC at 0-15°C into the rotator, dissolve until the solution is clear without turbidity, add the mixed solution into the rotary reactor, add polyamine and monoamine, and keep the reactor at 60-100°C Reaction temperature, reaction time is 15-600s, to obtain POL stock solution, add functional additives (antioxidant, dyeing auxiliaries, lubricant, anti-yellowing agent, etc.) Esters (0.5-2.5% of the mass of DOPE stock solution, temperature at 50-100°C), stirred for 30-600min, after DOPE was filtered to remove impurities, then pumped to the spinneret, dried in the tunnel to remove DMAC, and then After soaking (30-300s) in a...

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PUM

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Abstract

The invention relates to easy-unwinding spandex and a preparation method thereof. The preparation method comprises the following concrete steps of Step 1, prepolymerization: mixing MDI (Methylenediphenyl Diisocyanate) and PTMG (Polytetramethylene Etherglycol) for reaction to generate an NCO (Isocyanate Group) terminated PP (Prepolymer); Step 2, chain extension: dissolving the PP in DMAC (N,N-dimethyl acetamide) by a high-speed rotator, passing a solution through a rotary reactor, and adding chain-extended amine and terminated amine into the reactor to obtain a POL raw solution; Step 3, curing:adding function additives (an antioxidant, a dyeing additive, a lubricant, an anti-yellowing agent and the like) into the POL raw solution, after curing for a certain time, adding alkali-soluble polyester, and performing uniform stirring and dispersing to obtain a DOPE raw solution; and Step 4, spinning forming: after impurities are removed from the DOPE by a filter, conveying the DOPE to a spinneret plate through a pump; performing drying through a channel to remove the DMAC; then, performing soaking by a high-temperature alkali solution tank; performing drying by hot air; and after coolingand shaping, performing oiling to obtain the spandex. Meanwhile, in the production process, a spinning raw solution has good spinnability.

Description

technical field [0001] The invention relates to an easy-to-unwind spandex and a preparation method thereof, and belongs to the technical field of polyurethane elastic fiber material manufacturing. Background technique [0002] Polyurethane elastic fiber (commonly known as "spandex") has a wide range of applications in textiles, endowing fabrics with excellent elasticity. At present, in order to reduce the packaging cost, various manufacturers increase the yarn weight of a single spandex yarn cake, but this brings the severe test of unwinding and broken yarns at the bottom, especially the longer transportation and storage time, the higher temperature, and the more volatile oil. Cause unwinding and broken wires, affecting the efficiency of subsequent weaving. [0003] Related modification method, modification effect is not very ideal. For example, increasing the content of lubricant magnesium stearate in the DOPE stock solution will easily lead to the problem of whitening of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10C08G18/76C08G18/66C08G18/48C08G18/10
CPCD01F6/94D01F1/10C08G18/7671C08G18/4854C08G18/10C08G18/3228Y02P70/62
Inventor 吴志豪朱炫相杨晓印阮再勇季善伟陈仁俊
Owner ZHEJIANG HUAFENG SPANDEX
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