A kind of preparation method of meta-aramid fiber

A fiber and poly-m-phenylene isophthalamide technology, which is applied in the field of fiber manufacturing, can solve the problems of high cost, reduced product performance, increased human damage and the like, and achieves the effects of saving energy and simplifying solvent recovery steps.

Active Publication Date: 2016-08-10
X FIPER NEW MATERIAL CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As can be known from the above prior art reports, due to the introduction of metal ions in the solution polymerization method, the prepared polym-phenylene isophthalamide fiber contains metal ions, resulting in polym-phenylene isophthalamide fibers. The performance of the lower-end products of amine fiber is reduced. For example, the protective clothing made of meta-aramid fiber contains a large amount of metal ions in the fiber, which reduces the protection level and increases the damage to the human body. There is also meta-aramid paper The insulation performance of the fiber is reduced, it is easy to be broken down, and the ash content of the fiber is relatively large
All of the above are wet spinning, with many equipment and high cost

Method used

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  • A kind of preparation method of meta-aramid fiber

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Effect test

Embodiment 1

[0021] The concentration of polym-phenylene isophthalamide in the polymer spinning solution is 17.5wt%, hydrogen chloride 1.5wt%, and N,N-dimethylacetamide 81wt%. The polym-phenylene isophthalamide spinning solution is heated to 100°C by a heater. The hot air medium in the spinning hot tunnel is hot nitrogen, and the temperature of the hot nitrogen is 200°C. The stretching ratio of the primary fiber nozzle is 1.5 times. The medium of the solvent stretching bath is: 16wt% aqueous solution of N,N-dimethylacetamide, and the fiber solvent stretching ratio is 2 times. The thermal stretching temperature of polym-phenylene isophthalamide fiber is 290°C, and the dry heat stretching ratio is 2 times. The polym-phenylene isophthalamide fiber obtained in this embodiment has a fineness of 2.0 dtex, a tensile strength of 4.5 CN / dtex, and a fiber ash content of 203 ppm.

Embodiment 2

[0023] The concentration of polym-phenylene isophthalamide in the polymer spinning solution is 18.1wt%, hydrogen chloride 1.9wt%, and N,N-dimethylacetamide 80wt%. The polym-phenylene isophthalamide spinning solution is heated to 105°C by a heater. The hot air medium in the spinning tunnel is hot nitrogen, and the temperature of the hot nitrogen is 210°C. The stretching ratio of the primary fiber nozzle is 2 times. The solvent stretching bath medium is: N,N-dimethylacetamide 14wt% aqueous solution, and the fiber solvent stretching ratio is 2 times. The thermal stretching temperature of polym-phenylene isophthalamide fiber is 290°C, and the dry heat stretching ratio is 2.5 times. The polym-phenylene isophthalamide fiber obtained in this embodiment has a fineness of 2.1 dtex, a tensile strength of 4.8 CN / dtex, and a fiber ash content of 230 ppm.

Embodiment 3

[0025] The concentration of polym-phenylene isophthalamide in the polymer spinning solution is 18.5wt%, hydrogen chloride 2.5wt%, and N,N-dimethylacetamide 79wt%. The polym-phenylene isophthalamide spinning solution is heated to 105°C by a heater. The hot air medium in the spinning tunnel is hot nitrogen, and the temperature of the hot nitrogen is 215°C. The stretching ratio of the primary fiber nozzle is 2.5 times. The solvent stretching bath medium is: N,N-dimethylacetamide 12wt% aqueous solution, and the fiber solvent stretching ratio is 2.5 times. The thermal stretching temperature of polym-phenylene isophthalamide fiber is 300°C, and the dry heat stretching ratio is 3 times. The polym-phenylene isophthalamide fiber obtained in this embodiment has a fineness of 2.5 dtex, a tensile strength of 5.0 CN / dtex, and a fiber ash content of 250 ppm.

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Abstract

The invention relates to a method for preparing meta-position aramid fibers. The method is characterized by comprising the following steps: specially preparing a spinning solution of three components such as poly(m-phenyleneisophthalamide), hydrogen chloride and N, N-dimethylacetamide through adopting polymerization; deaerating the solution, then heating the solution, extruding the solution through a spinneret plate to enter a spinning hot channel, and removing solvents such as the N, N-dimethylacetamide and the hydrogen chloride through the hot channel so as to obtain nascent fibers; and stretching the nascent fibers through the solvent, washing to further removing the hydrogen chloride and the solvent in the nascent fibers, then drying, dry heating and stretching, cooling and oiling to obtain the finished fibers. The poly(m-phenyleneisophthalamide) spinning solution does not contain salt, and the deionized water and the solvent instead of salt are used in a whole fiber production process, so that the finally prepared meta-position aramid fiber products are low in ion content and fiber ash content; and solvent recovery steps are simplified, and energy sources are greatly saved.

Description

technical field [0001] The invention relates to a method for preparing meta-aramid fibers, in particular to a method for preparing polym-phenylene isophthalamide fibers with low ion content, and belongs to the field of fiber manufacturing. Background technique [0002] Meta-aramid fiber, the full name of poly-m-phenylene isophthalamide fiber (PMIA), also known as aramid fiber 1313, the strength and modulus of PMIA are equivalent to polyester and nylon, and there are strong hydrogen in the molecular chain of PMIA bond, which makes its chemical structure extremely stable, resistant to the corrosion of most high-concentration inorganic acids and other chemicals, and resistant to hydrolysis and steam corrosion. Through the comprehensive utilization of these characteristics, a series of new functions and new products have been continuously developed. , the field of application is becoming wider and wider, and the popularity is getting higher and higher, making aramid 1313 an irre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/60D01D1/02D01F13/04
CPCY02P70/62
Inventor 钟洲
Owner X FIPER NEW MATERIAL CO LTD
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