A kind of aramid-spandex sheath-core composite fiber and preparation method thereof

Abstract

The invention relates to an aramid-spandex sheath-core composite fiber and a preparation method thereof. The method is characterized in that a sheath layer spinning solution and a core layer spinning solution are simultaneously extruded in a sheath-core structure and subjected to dry spinning through a spinneret plate assembly of which a spinneret orifice is in a concentric circle form. A sheath layer of the aramid-spandex sheath core composite fiber is made of an aramid 1313 and a core layer is made of spandex; the section of the fiber is of a concentric circle solid structure; the sheath layer accounts for 5-20% of total weight of the fiber; the prepared aramid-spandex sheath core composite fiber has high resilience and also has high temperature resistance, chemical resistance and wear resistance; and meanwhile, the problems that the sheath layer aramid 1313 fiber is not easy to dye, the sheath-core composite fiber is difficult to spin and mold and the contact interface of the sheath layer and the core is easy to peel off are solved.

Description

technical field [0001] The invention relates to an aramid-spandex skin-core composite fiber and a preparation method thereof, belonging to the technical field of polyurethane elastic fiber material manufacturing. Background technique [0002] Aramid 1313, also known as meta-aramid, is a kind of "aromatic polyamide fiber" and has good flame retardancy, thermal stability, electrical insulation, Chemical stability, radiation resistance and mechanical properties. However, it is mostly used in aerospace, automobile industry, special protective clothing, electrical insulation materials and other fields, and it is rarely seen in the field of national life, especially in textiles. Pure aramid 1313 fabric is not only expensive, but also not comfortable enough to be widely used in daily life. [0003] Polyurethane elastic fiber is commonly known as spandex, and its chemical structure generally consists of two parts: "soft forging" and "hard forging". Due to the thermodynamic incomp...

AI Technical Summary

Problems solved by technology

[0008] Through our research, we found that: Patent CN200910144632 discloses a preparation method of spandex and polybutylene succinate sheath-core fiber and does not solve the problem of co-spinning of the cortex and core layer and the problem of the interface between the skin and core layer; patent CN201510117354 discloses A kind of antibacterial spandex fiber and its preparation method are disclosed, but its process is loaded down with trivial details, and the equipment needed is more complicated than the equipment of common dry spinning spandex, and operation is inconvenient, is not suitable for industrialized production; Patent CN200910100266 discloses a kind of aramid fiber 1414 fiber / Spandex covered silk and multifunctional protective socks using the covered silk use a blending method to combine aramid 1414 and spandex, but the performance stability and uniformity are not as good as aramid-spandex skin-core composite fiber