JP2008274481A - High specific gravity aramid fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high specific gravity high strength fiber, and to provide a fishing line using the fiber, so that a fishing line having specially strong tensile strength, causing no fish line floating near to the water surface and excellent in operability is provided. <P>SOLUTION: By adding 1-20 wt.% iron oxide having a specific gravity of ≥5.0 to p-aromatic polyamide fiber having high strength, a high specific gravity high strength fiber and a fishing line comprising the fiber are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high specific gravity aromatic polyamide fiber that is easy to cast, has sufficient strength, and is suitable for fishing lines.

  As a fishing line with high strength, low elongation, excellent wear resistance and bending resistance, a high-strength polyethylene fiber is used as a core thread, and a fishing line made by wrapping it with synthetic fiber, such as nylon fiber, is known. (Japanese Utility Model Publication No. 4-40456). However, since the specific gravity of the polyethylene resin itself is smaller than that of other synthetic resins, it tends to float near the surface of the water, so it is delayed that the fish belief when the fish etc. are caught on the fishhook is transmitted to the tip or hand, There was a problem that the fishhook moved unnaturally in the water and caused the fish to be wary. As a method for increasing the specific gravity of a fishing line, Japanese Patent Application Laid-Open No. 6-46726 and Japanese Patent Application Laid-Open No. 2002-335836 propose using a metal wire for the core. Although the specific gravity can be adjusted to some extent by this method, the metal wire has a problem that the bending resistance is not sufficient, the processing process is complicated, and the cost is increased.

Japanese Utility Model Publication No. 4-40456 JP-A-6-46726 JP 2002-335836 A

  It is an object of the present invention to provide a high specific gravity and high strength fiber that can prevent the fishing line from floating near the surface of the water and to provide a fishing line that has good operability, and a fishing line made of the fiber.

  A fiber having a high specific gravity and a high strength characteristic by containing 1 to 20% by weight of iron oxide having a specific gravity of 5.0 or more in a para-type aromatic polyamide fiber having a high strength characteristic, and the fiber The fishing line can be made of

  The fiber according to the present invention is a fiber having high specific gravity and high strength easily without being combined with a metal wire or the like by containing 1 to 20% by weight of iron oxide having a specific gravity of 5.0 or more. By using the fiber, it is possible to provide a fishing line with good durability and operability.

  Hereinafter, the present invention will be described in detail. The para-type aromatic polyamide fiber containing 1 to 20% by weight of iron oxide of the present invention is an aromatic copolyamide in which 80 mol% or more, preferably 90 mol% or more of the repeating units are composed of the following repeating units.

（ここでＡｒ１ 、Ａｒ２ は、下記の群から選ばれた同一のまたは相異なる芳香族残基である。但し、芳香族残基の水素原子はハロゲン原子または低級アルキル基で置換されていてもよい。）

Ｘは下記残基から選ばれる。

(Wherein Ar1 and Ar2 are the same or different aromatic residues selected from the following group, provided that the hydrogen atom of the aromatic residue may be substituted with a halogen atom or a lower alkyl group) .)

X is selected from the following residues.

  The production method of such para type aromatic polyamide is described in, for example, British Patent No. 1501948, US Pat. No. 3,738,964, Japanese Patent Laid-Open No. 49-10052, and the like.

  The size of the primary particle diameter of the iron oxide used in the present invention is 50 to 500 nm. In the case of an anisotropic solution such as a para-type aromatic polyamide, the polymer forms a liquid crystal in the dope and becomes a dense structure, so it is necessary to have a small size in order to incorporate an additive such as iron oxide. . On the other hand, in the isotropic solution, the polymer structure in the dope is loose, so that the additive can be easily taken in, and the problem of the size of the additive is small. However, for the following reasons, the primary particle diameter of iron oxide to be added must be 50 to 500 nm, and it is necessary to devise so that the aggregate particle diameter in the fiber does not exceed 500 nm.

  When the primary particle diameter of iron oxide is less than 50 nm, the surface energy is high, so it is easy to cause agglomeration, and when it exceeds 500 nm, coarse agglomerates in the fiber become defective foreign matter and cause fluff and yarn breakage due to single yarn breakage It is not preferable. The addition concentration of iron oxide is 1 to 20% by weight. If it is less than 1% by weight, the target specific gravity cannot be achieved by addition. On the other hand, if it exceeds 20% by weight, the influence as a foreign substance increases and the physical properties deteriorate.

The single yarn fineness of the fiber is 0.5 to 50 dtex. When the amount is less than 0.5 dtex, the added particles act as yarn defects and the spinning property becomes unstable. Moreover, since the specific surface area of the fiber is increased, it is susceptible to light resistance degradation. As a result, it leads to an increase in the amount of particles added, which further adversely affects foreign matters and disturbs the process condition, which is not preferable. When it exceeds 50 dtex, since the specific surface area is small in the spinning process, coagulation tends to be incomplete, and as a result, the process condition tends to be disturbed in the spinning and drawing processes, and the physical properties are liable to deteriorate. The strength is 15 g / dtex or more. The higher the strength, the better, but the strength tends to decrease as the concentration of the additive is increased. If it is less than 15 g / dtex, the characteristics of the aramid fiber as a high-strength fiber are insufficient. The elongation is 3.5% or more. If it is less than 3.5%, the twist strain becomes large when the yarn is used as a twisted yarn, and the strength utilization factor is lowered. The initial 20% modulus is 450 g / dtex or higher. When it is less than 450 g / dtex, it is not preferable as a high modulus fiber. The present invention provides an aramid fiber having a high specific gravity while maintaining fiber properties comparable to those of the prior art.
As a method for forming a fishing line, it may be used as it is with a monofilar or may be used by twisting it with a synthetic fiber such as nylon fiber.

Hereinafter, the present invention will be described in more detail with reference to examples. In addition, each physical property in an Example was measured with the following method.
(1) Fineness High elongation Initial 20% modulus Measured according to JIS L 1013 method.
(2) Specific gravity The specific gravity was measured according to the density gradient tube method using a thermostatic chamber for precision density gradient tubes manufactured by Shibata Kagaku Co., Ltd.

[Example 1]
Copolyparaphenylene 3.4 'oxydiphenylene terephthalamide resin (Technola manufactured by Teijin Techno Products) in 94% solution of N-methyl-2pyrrolidone (abbreviated as NMP) solvent with a specific gravity of 5.2 and primary average particle Iron oxide “100ED (manufactured by Toda Kogyo Co., Ltd.)” having a diameter of 100 nm is added so as to contain 5% by weight based on the resin weight, wet spinning, washing with water, adding a hydrated gel-forming inorganic compound and drying. The fiber was obtained through heat stretching at 510 ° C. The obtained fiber had a single yarn fineness of 1.5 de, a strength of 21.1 g / dtex, an elongation of 3.5%, a 20% modulus of 623 g / dtex, and a specific gravity of 1.57.

  90 fishing lines were twisted to obtain a fishing line. The evaluation of the fishing line was actually performed by carp fishing. The fishing line between the tip and the float slightly sinks in the seawater, so it was easy to deal with wind and waves. Even in the case of thru-thru fishing, where the fishing line can be moved freely without using a floating stopper, the influence of wind and waves is small, the floating operation is simple, and a wide range of shelves can be easily found.

[Example 2]
In Example 1, it carried out like Example 1 except having added iron oxide so that it might contain 1.5 weight% with respect to the resin weight. The obtained fiber had a single yarn fineness of 1.5 de, a strength of 22.1 g / dtex, an elongation of 3.7%, a 20% modulus of 638 g / dtex, and a specific gravity of 1.45.

  90 fishing lines were twisted to obtain a fishing line. The evaluation of the fishing line was actually performed by carp fishing. The fishing line between the tip and the float slightly sinks in the seawater, so it was easy to deal with wind and waves. Even in the case of thru-thru fishing, where the fishing line can be moved freely without using a floating stopper, the influence of wind and waves is small, the floating operation is simple, and a wide range of shelves can be easily found.

[Comparative Example 1]
In Example 1, it carried out like Example 1 except having added iron oxide so that it might contain 0.5 weight% with respect to the resin weight. The obtained fiber had a single yarn fineness of 1.5 de, a strength of 26.6 g / dtex, an elongation of 4.0%, a 20% modulus of 579 g / dtex, and a specific gravity of 1.40.

  90 fishing lines were twisted to obtain a fishing line. The evaluation of the fishing line was actually performed by carp fishing. The fishing line between the tip and the float was not easy to deal with wind and waves. Even in the case of thru-thru fishing, where fishing lines can be moved freely without using floating stoppers, they are highly affected by wind and waves, making floating operations difficult and making it difficult to find a wide range of shelves.

  The fiber of the present invention can be made into a fiber having a high specific gravity and a high strength, and by using the fiber, a fishing line with good durability and an appropriate specific gravity can be provided.

Claims (4)

A high specific gravity characterized by being an aromatic polyamide fiber containing 1 to 20% by weight of iron oxide having a specific gravity of 5.0 or more and a primary particle diameter of 50 to 500 nm, which satisfies the following requirements: Aromatic polyamide fiber.
a) Single yarn fineness: 0.5 to 50 dtex
b) Strength: 15 g / dtex or more c) Elongation: 3.5% or more d) Initial 20% modulus: 450 g / dtex or more e) Specific gravity: 1.42 or more   The high specific gravity aromatic polyamide fiber according to claim 1, wherein the aromatic polyamide is a para-type aromatic polyamide. A fishing line comprising a high specific gravity aromatic polyamide fiber containing 1 to 20% by weight of iron oxide having a specific gravity of 5.0 or more and a primary particle diameter of 50 to 500 nm and satisfying the following requirements.
a) Single yarn fineness: 0.5 to 50 dtex
b) Strength: 15 g / dtex or more c) Elongation: 3.5% or more d) Initial 20% modulus: 450 g / dtex or more e) Specific gravity: 1.42 or more   The fishing line comprising a high specific gravity aromatic polyamide fiber according to claim 2, wherein the aromatic polyamide is a para-type aromatic polyamide.