Method for preparing potential two-component elastic fiber based on melt direct-spinning technology

Abstract

The invention relates to the field of spinning, and discloses a method for preparing a potential two-component elastic fiber based on a melt direct-spinning technology. The method includes the steps of firstly, performing esterification and prepolycondensation to prepare a polyester melt; secondly, performing final polycondensation and liquid-phase tackifying on part of the polyester melt to obtain a high-viscosity polyester melt with viscosity of 0.85-0.95 dl / g; thirdly, performing final polycondensation on the rest of the polyester melt to obtain a low-viscosity polyester melt with viscosityof 0.47-0.5 dl / g; fourthly, performing spinning; fifthly, performing network preprocessing; sixthly, performing drafting, setting and slacking; and seventhly, performing winding and forming. By modifying a melt pipeline conveying and spinning process and a liquid-phase tackifying kettle, uniformity and flowability of the melt in the preparing and conveying process of the high-viscosity melt can be realized, the problems of high pipeline pressure drop and high melt viscosity degradation are solved, and the method is short in technological process, low in production cost, high in efficiency andstable in product quality.

Description

technical field [0001] The invention relates to the field of spinning, in particular to a method for preparing latent bicomponent elastic fibers based on melt direct spinning technology. Background technique [0002] The so-called composite fibers are also called bicomponent fibers and conjugate fibers. It is to transport two or more fiber-forming high polymer melts or concentrated solutions with different components, proportions, viscosities, etc. Adjacent spinneret holes are ejected into one fiber. At present, the two-component elastic composite fiber on the market mainly uses two kinds of aliphatic polyesters with different shrinkage rates, and uses composite spinning technology and post-processing heat finishing to make it shrink, and obtain a spiral three-dimensional crimp, with a curl properties such as high elasticity and high elasticity. [0003] Looking at domestic and foreign patent documents, the spinning process route of chip spinning is generally used to prod...

AI Technical Summary

Problems solved by technology

[0005] However, due to technical problems such as the homogeneity and fluidity of the melt during the preparation and transportation of the high-viscosity melt, the large pressure drop in the pipeline, and the large degradation of the melt viscosity, the use of melt direct spinning technology to prepare high-viscosity polymer fibers has not been possible. It can be applied in a wide range. At present, the two-component melts are produced by melt direct spinning to produce two-component elastic composite fibers. There is no literature yet.

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