A kind of preparation method of easy unwinding spandex

Abstract

The invention relates to an easy-unwinding spandex and a preparation method thereof. The specific preparation method is as follows: Step 1. Prepolymerization: mixing and reacting diphenylmethane diisocyanate MDI and polytetramethylene ether glycol PTMG to generate isocyanate group NCO End-capped prepolymer PP; Step 2. Chain extension: Dissolve PP in N,N-dimethylacetamide DMAC using a high-speed rotator and pass the solution through a rotating reactor where chain-extending amine is added , end-capped amine to obtain the POL stock solution; step 3. ripening: add functional additives (antioxidant, dyeing auxiliaries, lubricants, anti-yellowing agents, etc.) in the POL stock solution, mature for a certain period of time, add alkali-soluble polyester, After stirring and dispersing evenly, the DOPE stock solution is obtained; Step 4. Spinning and forming: the above-mentioned DOPE is pumped to the spinneret after removing impurities through the filter, and then dried in the tunnel to remove DMAC, then soaked in a high-temperature lye pool, and dried with hot air After drying, cooling and shaping, oiling is done to obtain spandex. At the same time, in the production process, the spinnability of the spinning dope is good.

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...

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