A kind of elastic fiber of cross-linked styrene block copolymer mixture and its manufacturing method

Abstract

The present invention relates to a method for the manufacture of elastic fibers of a crosslinked styrenic block copolymer mixture comprising the steps of: a) providing a styrenic block copolymer mixture comprising at least one styrenic block copolymer by blending segment copolymer A, and at least one ethylene copolymer B; b) melt spinning the styrene block copolymer mixture to obtain elastic fibers; c) radiation crosslinking the obtained elastic fibers; wherein, The styrene block copolymer A is an unsaturated styrene block copolymer, its styrene / rubber ratio is between 10:90 and 45:55, and its melt index (200°C / 5.0kg) is 1-50g / 10min, the density of the ethylene copolymer B is 0.855~0.890g / cm 3 , the melt index (190°C / 2.16kg) is 0.5-10g / 10min, and the ratio of the styrene block copolymer A to the ethylene copolymer B is between 85:15-15:85.

Description

technical field [0001] The present invention relates to a manufacturing method of cross-linked styrene block copolymer mixture elastic fiber; and a styrene block copolymer mixture elastic fiber produced by the manufacturing method; Applications in fields such as textile fabrics or elastic cords. Background technique [0002] Comfort, fit, shape retention, anti-wrinkle, and compliance with sports requirements are important attributes given to fabrics or clothing by elastic fibers, and they are also the development direction of clothing or fabrics. The source of medium elasticity is mainly realized by adding elastic fibers in clothing fabrics. [0003] Among the existing elastic fibers, spandex (scientific name "polyurethane elastic fiber", including dry-process spandex, wet-process spandex and melt-spun spandex) accounts for nearly 90% of the market share and occupies a dominant position in the field of textile or elastic cords, but spandex exists Easy to age and degrade, e...

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Problems solved by technology

[0006] 1. The strength is low, the breaking strength is between 0.50-0.80cN / dtex, far lower than the breaking strength of ordinary dry-process spandex 1.0-1.7cN / dtex, so the elastic fabric produced by Dow's polyolefin elastic fiber is less elastic , only suitable for the production of low-elasticity fabrics and cannot produce medium-high-elasticity fabrics;

[0007] 2. The elastic recovery rate is poor. The elastic recovery rate of Dow’s polyolefin elastic fiber after 300% stretching is generally not higher than 85%, which is nearly 10% lower than that of ordinary dry-process spandex after 300% stretching. % or even more, so that it cannot be promoted and used in many fabrics that require normal rebound rate requirements (such as underwear, swimsuits, jeans, sportswear, etc.);

[0008] 3. The polyolefin elastic fiber produced by Dow has complicated processing technology and high cost, so it has never been able to enter the mainstream market of elastic fiber

Such a high dose of irradiation not only significantly increases the production cost of the fiber, but also obviously causes yellowing and discoloration of the elastic fiber, and shrinkage and deformation of the elastic fiber cake, resulting in the adhesion of the elastic fiber in the inner layer, a significant increase in the end-break rate, and degradation. roll difficulty etc.

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