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Method for preparing thermostable meltspun urethane elastic fiber

A heat-stabilized, melt-spinning technology, applied in melt-spinning, textiles and papermaking, single-component polyurethane rayon, etc., can solve the problems of poor thermal stability of melt-spun spandex, increase crystallinity and improve thermal stability , the effect of increasing the grain size

Inactive Publication Date: 2006-12-20
江苏南黄海实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for preparing thermally stable melt-spun spandex, by selecting suitable additives, increasing the force between spandex macromolecular chains and the crystallinity and grain size of the hard segment phase, thereby improving the thermal stability of spandex It mainly solves the problem of poor thermal stability of melt-spun spandex

Method used

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Examples

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Embodiment Construction

[0006] A preparation method of heat-stable melt-spun spandex, adding heat-resistant cross-linking agent and thermoplastic polyurethane elastomer slices into a screw extruder, the slices are melted due to heat, and the melt is extruded under a certain pressure and transported to the spinning position , and then the melt is quantitatively and evenly pressed to the spinneret with a spinning pump, and the thin stream of the melt is extruded from the small hole of the spinneret, cooled in the tunnel and solidified into fibers, oiled and wound into a cylinder; Additives are also mixed in the thermoplastic polyurethane elastomer chips, and the additives are one of fatty amine, nylon, benzoguanidine, thiourea, epoxy-modified soybean oil, coupling agent, silicone oil or a mixture thereof. In the present invention, the coupling agent mainly refers to silane and titanate coupling agents, and the siloxane chain link formed by the silane coupling agent can have certain compatibility with th...

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PUM

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Abstract

The invention belongs to chemical fiber modification field, mainly solving the defection of low thermal stability for melt spun urethane elastic fiber, provides a method for preparing thermostable melt spun urethane elastic fiber. The method comprises: cutting the additive, cross linking agent, thermoplastic urethane elastomer, homogeneously mixing them, melting, squeezing, coiling and forming. By selecting fit additive, the invention can increase the acting forces between macrochains of melt spun urethane elastic fiber and the crystallinity and crystal grain size of hard section phase, and improve the thermal stability of melt spun urethane elastic fiber.

Description

technical field [0001] The invention relates to a method for modifying chemical fibers, and in particular provides a method for preparing heat-stable melt-spun spandex. Background technique [0002] In the prior art, spandex, also known as polyurethane elastic fiber, has incomparable elasticity to any other fiber, and its elongation at break is greater than 400%, usually 500-700%, and up to 800%. The elastic recovery rate is over 95% when the deformation is 300%, and it has excellent fatigue resistance and elastic recovery rate, and the elasticity is durable without deformation. Polyurethane elastic fiber has good chemical resistance and oil resistance. Polyurethane's stable microphase separation aggregate structure is the basis of spandex elasticity. The driving force of the microphase separation process is the thermodynamic incompatibility between the soft and hard segments, the hydrogen bonding and dipole interactions in the hard segments, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/70D01D5/08D01F6/88
Inventor 朱新生扈益民程嘉祺顾亚兵
Owner 江苏南黄海实业股份有限公司