Aramid-spandex sheath-core composite fiber and preparation method thereof

A composite fiber and spandex technology, which is applied in the field of polyurethane elastic fiber material manufacturing, can solve the problem of not solving the interface problem of co-spinning the cortex and core layer to form the cortex-core layer, poor performance stability and uniformity, and unsuitable for industrial production. , to achieve the effect of improving dyeability and color fastness, good emulsifying ability and high resilience

Active Publication Date: 2017-05-31
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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preparation example Construction

[0035] The invention relates to an aramid-spandex skin-core composite fiber and a preparation method thereof. The skin layer is coated on the outside of the core layer. The skin layer is made of aramid fiber 1313, the core layer is made of spandex, and the cross section of the fiber is a concentric circular solid structure. The preparation method is as follows: dry spinning by sheath-core extrusion method, the cortex spinning stock solution and the core layer spinning stock solution enter the spinning system together, and the cortex accounts for 5-20% of the total weight of the composite fiber by separating elements and metering pumps. % and extrude from the spinneret together, enter the dry spinning tunnel, dry at high temperature, oil with oil, and wind up.

[0036]The described cortex spinning dope is prepared by low-temperature solution polycondensation from isophthaloyl chloride (IPC) and m-phenylenediamine (MPD). The preparation method comprises the following steps:

[0...

Embodiment 1

[0054] The first step: preparation of cortical spinning dope

[0055] 1) Preparation of polymer solution: Dissolve m-phenylenediamine in N,N-dimethylacetamide (DMAC) solvent, the mass concentration is 10.0%, the temperature is -10°C, add isophthaloyl chloride under stirring , The molar ratio of m-phenylenediamine to isophthaloyl chloride is 1:1.02. During the initial reaction feeding, quickly add isophthaloyl chloride accounting for 75% of the total amount, and control the feeding time for 15 minutes to complete; then cool the obtained prepolymer solution to 5 ° C, and slowly add the remaining 25% isophthaloyl chloride. The control feeding time is 55min. Control the temperature of the prepolymer solution to be 28-32°C.

[0056] 2) Prepare the fiber-forming polymer solution: add calcium hydroxide to the polymer solution prepared in step 1) to neutralize the hydrogen chloride therein, filter impurities and adjust the fiber-forming polymer solution mass concentration to 32.0%, ...

Embodiment 2

[0067] The first step: preparation of cortical spinning dope

[0068] 1) Preparation of polymer solution: Dissolve m-phenylenediamine in N,N-dimethylacetamide (DMAC) solvent, the mass concentration is 15.0%, the temperature is -5°C, add isophthaloyl chloride under stirring , the mol ratio of m-phenylenediamine and isophthaloyl dichloride is 1:1.05, and the isophthaloyl dichloride that accounts for 75% of the total amount is added rapidly during the initial reaction charging, and the control feeding time is completed in 20 minutes; then the obtained prepolymer The temperature of the solution was lowered to 10°C, and the remaining 25% isophthaloyl chloride was added slowly, and the addition time was controlled to be 60 minutes. Control the temperature of the prepolymer solution to be 28-32°C.

[0069] 2) Prepare fiber-forming polymer solution: add butanediamine containing basic ions to the polymer solution prepared in step 1), filter impurities and adjust the mass concentration...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/12D01F8/16D01F1/10D01D5/34D01D1/02D01D5/04C08G69/28
CPCC08G69/28D01D1/02D01D5/04D01D5/34D01F1/10D01F8/12D01F8/16
Inventor 池晓智杨晓印温作杨邵晓林吴志豪赵晓阳赵婧
Owner ZHEJIANG HUAFENG SPANDEX
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