Production method of polyurethane urea elastic fiber with high heat setting efficiency

Abstract

The invention relates to a production method of polyurethane urea elastic fiber with high heat setting efficiency. The method comprises the steps of: reacting with polytetramethylene ether glycol, 4,4'diphenylmethane diisocyanate and isophorone diisocyanate in solvent to obtain isocyanate-terminated prepolymer; adding monamine compound and bis(secondary amine) compound mixed amine organic amide solution into the prepolymer for performing first chain extension, and then adding monamine compound and bis(primary amine) compound mixed amine organic amide solution for performing second chain extension to obtain polyurethane urea solution, and finally adding properly organic amide solution with low-volatile diamine and / or triamine compound into the stock solution; finally, adding 4,4'diphenylmethane urea derivatives into the generated stock solution with excessive amine; agitating the polyurethane urea stock solution at low speed and curing, then performing dry-process spinning to obtain polyurethane urea elastic fiber. According to the production method, the requirement on the setting efficiency of the polyurethane urea elastic fiber in the special fields can be met.

Description

technical field [0001] The invention relates to a manufacturing technology of polyurethane urea elastic fiber, which belongs to the technical field of polyurethane urea fiber. In particular, it relates to a production method of polyurethane urea elastic fibers with high heat setting efficiency and its products. More specifically, the present invention relates to a polyurethane urea elastic fiber prepared from a prepolymer terminated by a mixed diisocyanate component, chain-extended by a mixed diamine, and added with 4,4'-diphenylmethane urea derivatives. Background technique [0002] Polyurethane urea elastic fiber is a block type high elastic chemical fiber obtained by the reaction of polymer polyol and excess organic diisocyanate, isocyanate-terminated prepolymer and chain extension of diamine compound, commonly known as spandex (Spandex ). Due to the existence of urea structure and carbamate structure in polyurethane urea, a large number of hydrogen bonds will be genera...

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Problems solved by technology

[0004] Although the heat setting efficiency of the polyurethane urea elastic fibers prepared by these methods has been improved to a certain extent, the negative impact on the elastic function and strength of the fibers is also relatively large, the spinnability is slightly poor, and some more complicated production methods are required. Equipment, the fibers prepared by some methods also have the problem of a decrease in the setting efficiency in the subsequent processing, and the most important point is that they still cannot reach the index of higher heat setting efficiency at a lower temperature (such as 130°C)

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