Method for preparing meta-position aramid fibers

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...

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

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