Wholly aromatic polyamide fiber and process for producing the same

a technology of aromatic polyamide fiber and process, which is applied in the direction of yarn, spinning method, transportation and packaging, etc., can solve the problems of not always being able to obtain a compound material having superior strength, compound materials containing fillers are generally known to have the disadvantage of low ultimate elongation, and achieve high mechanical properties , satisfactory process stability, the effect of high toughness factor

Inactive Publication Date: 2007-02-08
TEIJIN LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] An object of the present invention is to provide wholly aromatic polyamide fibers having high mechanical properties, and a high toughness factor in particular, that can be spun with satisfactory process stability in a spinning process, and a process for industrially producing the same.
[0013] According to research conducted by the inventors of the present invention, drawn and oriented wholly aromatic polyamide fibers obtained by wet spinning and drawing a spinning liquid containing a wholly aromatic polyamide and a layer-structured clay mineral were found to have superior mechanical characteristics, and particularly superior toughness factor. More surprisingly, it was also found by the inventors of the present invention that, instead of completely uniformly dispersing each layer of the layer-structured clay mineral in the fibers, by scatteringly distributing a plurality of regions having a relatively high layer-structured clay mineral distribution density in the aromatic polyamide polymer matrix that composes the particles, the effect of improving the mechanical characteristics of the fibers, and particularly the toughness factor, can be further enhanced by the layer-structured clay mineral particles.

Problems solved by technology

However, the strength of a compound material is known to be greatly affected not only by the strength of the polymer serving as the matrix of the compound material as well as the strength of the filler itself, but also by the interface adhesion between the filler and polymer, and the quality of the wettability of the polymer to the filler has an effect not only on the ease of production, but also on the strength of the finished product.
For reasons such as these, it is not always possible to obtain a compound material having superior strength even if a filler or polymer having high strength and elasticity is used for the material.
Moreover, compound materials containing a filler are generally known to have the disadvantage of low ultimate elongation.
Although a known example of a process for improving fiber mechanical strength involves improving the degree of orientation of fibers by drawing, in the case of using such a process, as ultimate elongation is known to decrease with the improvement tensile strength, it becomes difficult to produce filaments having a high toughness factor.
However, these are all targeted at thermoplastic polyamide, and the use of a layer-structured clay mineral for non-thermoplastic polyamide, in the form of wholly aromatic polyamide fibers, is not disclosed in these patent documents.
However, the improvement of the mechanical properties of wholly aromatic polyamide fibers by containing a layer-structured clay mineral as filler, and wholly aromatic polyamide fibers containing a layer-structured clay mineral as filler and having a high toughness factor as a result of thereof, are not known from documents of the prior art.

Method used

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  • Wholly aromatic polyamide fiber and process for producing the same
  • Wholly aromatic polyamide fiber and process for producing the same
  • Wholly aromatic polyamide fiber and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0109] 215 g of polymetaphenylene isophthalamide having an intrinsic viscosity of 1.35 dl / g were dissolved in 785 g of NMP and stirred to a uniformly transparent dope. Separate from this procedure, a layer-structured clay mineral in the form of a smectite clay mineral treated with polyoxypropylene methyl diethyl ammonium chloride (trade name: Lucentite SPN, Co-op Chemical) was mixed and dispersed in NMP to a concentration of 1% by weight. The resulting layer-structured clay mineral dispersion was added to the wholly aromatic polyamide solution so as to have the composition shown in Table 1 followed by stirring to prepare a spinning liquid (dope). The haze of the resulting dope was 2.41. After degassing the resulting dope, it was extruded into the shape of filamentary streams from a spinneret having a cap diameter of 0.07 mm and 100 holes, the filamentary streams were introduced into a coagulation bath composed of a 43% aqueous calcium chloride solution (containing 1% by weight NMP) ...

example 2

[0110] Wholly aromatic polyamide fibers having the composition shown in Table 1 were produced in the same manner as Example 1 with the exception that smectite layer-structured clay mineral (trade name: Lucentite STN, Co-op Chemical) treated with trioctyl methyl ammonium chloride was used for the layer-structured clay mineral. The haze of the spinning liquid at this time was 1.92. In addition, the average layer thickness of the layer-structured clay mineral particles was 86 nm, and the degree of orientation A was 91%. The tensile strength, ultimate elongation and toughness factor (TF) of the resulting fibers are shown in Table 1.

example 3

[0112] 0.16 parts by weight of polymetaphenylene isophthalamide having an intrinsic viscosity of 1.9 dl / g were dissolved in 1.46 parts by weight of NMP and stirred to a uniformly transparent dope. 0.18 parts by weight of layer-structured clay mineral in the form of smectite clay mineral treated with polyoxypropylene methyl diethyl ammonium chloride (trade name: Lucentite SPN, Co-op Chemical) were added to this dope followed by stirring to prepare Polymer Solution A. Separate from this procedure, 17.44 parts by weight of polymetaphenylene isophthalamide were dissolved in 63.68 parts by weight of NMP to prepare transparent Polymer Solution B.

[0113] After mixing and stirring the Polymer Solutions A and B, 17.08 parts by weight of NMP were further added to this mixture to prepare a spinning liquid composed of 17.60 parts by weight of polymetaphenylene isophthalamide, 0.18 parts by weight of Lucentite SPN (trade name) and 82.22 parts by weight of NMP.

[0114] This spinning liquid was hea...

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Abstract

A wholly aromatic polyamide fiber which has excellent mechanical properties (toughness factor) and can be produced while attaining a satisfactory operation stability in the fiber formation step. The fiber comprises 100 parts by mass of a wholly aromatic polyamide and 0.05 to 20 parts by mass of particles of a lamellar clay mineral, e.g., hectorite, saponite, stevensite, beidellite, montmorillonite, or swelling mica.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to wholly aromatic polyamide fibers containing a layer-structured clay mineral, and a production process thereof. More particularly, the present invention relates to wholly aromatic polyamide fibers containing a layer-structured clay mineral and having improved mechanical characteristics, particularly toughness, and a production process thereof. [0003] 2. Description of the Related Art [0004] Considerable interest has been focused on the imparting of high added value to polymers and enhancement of their performance in recent years. Compound materials obtained by containing a filler in a polymer have been actively developed in order to impart high added value and high performance to polymers. In the past, fibrous or acicular fillers have been used as reinforcing fillers for the purpose of improving the mechanical characteristics and heat resistance of polymers and, as a result, known pol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D02G3/00D01F1/10D01F6/90
CPCD01F1/10D01F6/905Y10T428/2913Y10T428/2927Y10T428/2973D10B2331/021
Inventor HONDA, SUSUMUNITTA, HIDEAKIMATSUMURA, SHUNICHIYAGURA, YASUSHIGEFUJITA, HIROSHIHASHIDATE, SADAHITO
Owner TEIJIN LTD
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