Gel spinning method for manufacturing aramid fiber III

A technology of gel spinning and fiber, which is applied in the spinning field of aramid III fiber, can solve the problems of aramid III fiber that have not been reported, and achieve the effects of excellent appearance quality, stable production process and excellent fiber performance.

Active Publication Date: 2015-01-14
CHINA BLUESTAR CHENGRAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, there has been no relevant report on the production of aramid Ⅲ fiber by gel method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for manufacturing aramid fiber III fiber gel spinning, the process steps are as follows:

[0035] A. The polymer intrinsic viscosity of the spinning stock solution is 6.5dL / g. The stock solution is accurately metered by the metering pump and extruded through the spinneret to form a thin flow into a section of air layer with a height of 15mm;

[0036]B, the extruded stream through the air layer enters the low-concentration first-stage coagulation liquid to become a gel fiber; the coagulation liquid is a mixed liquid of ethanol and water, wherein the content of ethanol is 15%wt; Negative stretching is used in the primary coagulation solution, and the negative stretching rate is -80%;

[0037] C. The gel fiber enters the coagulation solution composed of the second-stage ethanol and water with a higher concentration, wherein the ethanol content is 30%wt; the gel fiber is plasticized and stretched in the second-stage coagulation solution. The elongation rate is 160...

Embodiment 2

[0042] A method for manufacturing aramid fiber III fiber gel spinning, the process steps are as follows:

[0043] A. The polymer intrinsic viscosity of the spinning stock solution is 7.2dL / g. The stock solution is accurately metered by the metering pump and extruded through the spinneret to form a thin stream into a section of air layer with a height of 20mm;

[0044] B. The extruded fine stream through the air layer enters the low-concentration first-stage coagulation liquid to become a gel fiber; the coagulation liquid is a mixed liquid of N, N-dimethylacetamide and water, wherein N, N -The content of dimethylacetamide is 6%wt; the fiber adopts negative stretching in the first stage coagulation liquid, and the negative stretching rate is -70%;

[0045] C, gel fiber enters in the coagulation liquid that the second stage N of higher concentration, N-dimethylacetamide and water form, and wherein N, N-dimethylacetamide content is 35%wt; Gel fiber is in In the second-stage coagu...

Embodiment 3

[0050] A method for manufacturing aramid fiber III fiber gel spinning, the process steps are as follows:

[0051] A. The polymer intrinsic viscosity of the spinning stock solution is 8.1dL / g. The stock solution is accurately metered by a metering pump and extruded through a spinneret to form a thin stream into a section of air layer with a height of 10mm;

[0052] B. The extruded fine stream through the air layer enters the low-concentration first-stage coagulation liquid to become a gel fiber; the coagulation liquid is a mixed liquid of N, N-dimethylformamide and water, wherein N, N - The content of dimethylformamide is 10%; the fiber is negatively stretched in the first stage coagulation solution, and the negative stretch rate is -55%;

[0053] C. The gel fiber enters the coagulation liquid composed of the second stage N, N-dimethylformamide and water with a higher concentration, wherein the N, N-dimethylformamide content is 25%wt; the gel fiber is in In the second-stage co...

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Abstract

The invention provides a gel spinning method for manufacturing aramid fiber III, belonging to the technical field of chemical synthesis fibers. The gel spinning method comprises the following technological steps: A. extruding a spinning stock solution through a metering pump and a spinneret to form fine flow entering an air layer; B. leading the extruded fine flow passing through the air layer to enter first-level freezing liquid to form gel fibers and treating by adopting negative stretching; C. leading the gel fibers to enter second-level freezing liquid, performing plasticized positive stretching and further freezing to form aramid fiber III with a collection state primary structure; D. washing, oiling and drying the secondarily frozen and formed aramid fiber III to obtain aramid fiber III protofilament; and E. performing heat setting to the aramid fiber III protofilament to obtain finished fibers. According to the gel spinning method, the performance of the aramid fiber III products can be further improved, the fiber production efficiency can be markedly increased, the fiber impregnation strength of the finished fiber is improved to 5.8GPa, and the spinning speed achieves 30-100m/min.

Description

technical field [0001] The invention relates to a spinning method of aramid III fiber, more specifically, the invention relates to a spinning process for producing aramid III fiber by gel spinning method, which belongs to the technical field of chemical synthetic fiber. Background technique [0002] Aramid III polymer is formed by polycondensation of terephthaloyl dichloride, p-phenylenediamine, and 5(6)-amino-2-(4-aminophenyl) benzimidazole. The polymer passes After spinning, it is made into high-performance aramid fiber III. Aramid III fibers have excellent properties of high strength, high modulus, high temperature resistance, and corrosion resistance. They are often used in the manufacture of fiber-reinforced composite materials, and are widely used in aircraft components, armor bulletproof, individual protection, advanced motor vehicles and other applications. [0003] The currently disclosed aramid III fiber spinning technologies include wet spinning, dry spinning, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/06D01D10/06D01D10/02D01D5/12
CPCD01D5/06D01D5/12D01D10/02D01D10/06
Inventor 彭涛王凤德刘克杰王成东
Owner CHINA BLUESTAR CHENGRAND CO LTD
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