Production of uniform polyphenylene terephthalamide fibre

Abstract

The invention relates to a manufacturing method of homogeneous polyphenylene terephthalamide fibers. The polyphenylene terephthalamide fibers with high homogeneity can be produced by thoroughly mixing PPTA resin with 98 to 100 percent of concentrated sulfuric acid in an anisotropic twin-screw extruder, putting the mixture of the PPTA resin and 98 to 100 percent of the concentrated sulfuric acid into a homotropic twin-screw extruder to be dissolved, and leading the mixture through a filter equipment, a continuous film deaeration device and rectangular spinneret holes to carry out dry-jet and wet spinning. By adopting the anisotropic twin-screw extruder to mix materials, the manufacturing method has the advantages of easy feeding, strong mixing effect and weak shearing effect; the continuous film deaeration device can realize uniform and fast deaeration of high viscous PPTA/H2SO4 liquid crystal slurry; the spinneret holes which are arranged in a rectangle shape can ensure a larger contact area between injection tows and solidification liquid, and more even mass transfer and heat transfer between fibers and solidification liquid, thus facilitating the spinning of polyphenylene terephthalamide fibers with high homogeneity.

Description

technical field [0001] The invention relates to a method for manufacturing high-performance fibers, in particular to a method for manufacturing uniform poly-p-phenylene terephthalamide fibers. Background technique [0002] Polyparaphenylene terephthalamide fiber is a typical aromatic polyamide fiber, also known as PPTA fiber or para-aramid fiber or aramid fiber 1414, because of its excellent properties such as high strength, high modulus, and high temperature resistance, it has become a In recent years, a type of high-tech fiber with the fastest development speed among synthetic fiber materials is mainly used in the field of industrial textiles, especially many products require lightweight and high performance, so only polyparaphenylene terephthalamide fiber can be used . [0003] In the early 1970s, PPTA / H was first invented by DuPont of the United States. 2 SO 4 The method of dry-jet wet spinning of liquid crystal solution has produced this kind of high-strength and hig...

AI Technical Summary

Problems solved by technology

However, poly-p-phenylene terephthalamide resin is subject to high shear for a long time in concentrated sulfuric acid, and it is still prone to degradation, which affects the strength of PPTA fibers; on the other hand, the circular arrangement of the spinneret holes makes the spinning The contact area between the filaments and the coagulation liquid is relatively small, which is not conducive to the mass transfer and heat transfer between the filaments and the coagulation liquid, and is not conducive to spinning PPTA fibers with high uniformity requirements.