Dry spinning polyurethane-based elastic fiber

Abstract

To provide a treatment agent for polyurethane-based elastic fiber for adding excellent unwindability, unwindability with time, cob-webbing resistance and scum deposition resistance at the same time to a polyurethane-based elastic fiber having a heat generation amount by a DSC measurement in a specific range, and a treatment method for the polyurethane-based elastic fiber using the treatment agent. As a treatment agent for the following polyurethane-based elastic fiber, used is one consisting of the following smoothing agent and the following unwindability enhancing agent with over 85 mass% to 99.7 mass% of the following smoothing agent and 0.3 mass% to 15 mass% of the unwindability enhancing agent (total 100 mass%). Polyurethane-based elastic fiber: polyurethane-based elastic fiber having a heat generating amount at 150 to 300 DEG C by a differential scanning calorimeter (DSC) measurement of 150 to 450 mJ / mg. Smoothing agent: at least one selected from silicon oil, mineral oil and ester. Unwindability enhancing agent: at least one selected from a silicon resin having a trifunctional siloxane unit and / or a tetrafunctional siloxane unit in a molecule as a constitutional unit and mass average molecular weight of 3000 to 100000 and alkali earth metal salt of aliphatic acid having 10 to 22 carbon atoms.

Description

Technical field [0001] The present invention relates to dry spinning polyurethane elastic fibers. More specifically, it relates to dry spinning that simultaneously imparts excellent unwinding properties, unwinding properties over time, yarn skipping resistance, and scum accumulation resistance. Silk polyurethane elastic fiber. Background technique [0002] Conventionally, as dry-spun polyurethane elastic fibers, known are fibers to which a treatment agent is attached, and the treatment agent includes a modified silicone having a terminal group-terminated polyether group (for example, refer to Patent Document 1 ); A fiber with a treatment agent that contains water-soluble silicone (for example, refer to Patent Document 2); a fiber with a treatment agent that contains a polyalkylene ether glycol, a higher alcohol, and a mineral Oil and dimethyl silicone (for example, refer to Patent Document 3); fibers to which a treatment agent is attached, and the treatment agent contains variou...

AI Technical Summary

Problems solved by technology

However, these conventional dry-spun polyurethane elastic fibers have a problem in that the unwinding properties imparted to polyurethane elastic fibers having a calorific value measured by a differential scanning calorimeter (hereinafter referred to as DSC) is within a specific range , Insufficient unwinding properties over time, yarn skipping resistance and scum accumulation resistance