JPS63317032A - Fishing line - Google Patents

Abstract

PURPOSE:To obtain a fishing line capable of thinning, having excellent rigidity, sinking speed and durability, slightly causing backlash and entanglement, comprising an aromatic polyester yarn having tensile breaking strength and density adjusted to >=specific values. CONSTITUTION:For example, 40-70mol.% p-hydroxybenzoic acid, 15-30mol.% aromatic dicarboxylic acid such as terephthalic acid and 15-30mol.% aromatic diol such as resorcinol are subjected to polycondensation by esterifying or ester interchange reaction at 150-360 deg.C at normal pressure or under reduced pressure at 10-0.1Torr to give an aromatic polyester showing anisotropy in melting. The polyester is subjected to melt spinning at 280-420 deg.C to give aromatic polyester yarn having >=100kg/mm<2> tensile breaking strength and >=1.38g/cc density. Then the yarn is processed into a fishing line.

Description

[Detailed description of the invention] <Industrial application field> FIELD OF THE INVENTION The present invention relates to fishing lines.

<Prior Art and Problems> Conventionally, fishing lines have been made of drawn organic fibers such as polyamide and polyester.

However, fishing lines made from these materials are generally not strong enough, so they have to use ones with a large diameter, which means they are easily affected by currents, and they tend to make fish wary, making them less likely to bite into the bait. Because the fishing line has a high elongation, the fish signal indicating that a fish has been hooked is easily attenuated and is difficult to transmit to the hand or the tip of the rod.The elastic modulus is low, so the line has no elasticity and is prone to entanglement and tangles among the lines. Due to its high water absorption, it is difficult to handle and have a long lifespan, and because it is thick and has low density, it has problems such as slow sinking speed of the fishing line when fishing in deep sea.

In order to improve these problems, waterproofing is applied to the surface of the fishing line. Although efforts have been made to create a woven structure,
It's still not enough.

High-strength polyethylene fibers are also being developed, but they do not solve the above problems because their density is lower than that of water, and aramid fibers are water-absorbing. Furthermore, fibers such as metal fibers, glass fibers, and carbon fibers are difficult to handle.

For this reason, a fishing line that is lightweight, has high strength, high elastic modulus, and has stiffness is desired.

An object of the present invention is to provide a fishing line that has improved the problem of darning.

<Means for Solving the Problems> The present invention relates to a fishing line made of aromatic polyester fiber having a tensile strength at break of 00 kg/mm 2 or more per month and a density of 1.38 g/cc or more.

The aromatic polyester fiber in the present invention can be obtained, for example, by the method disclosed in Japanese Patent Publication No. 55-20008, Japanese Patent Application Laid-open No. 58-191219, and the like.

Preferred aromatic polyester fibers are fibers obtained by melt spinning from aromatic polyesters that exhibit anisotropy when melted. Among them, the elastic modulus is 67 on/am” or more,
A material with an elongation of 10% or less is preferable because it has firmness, does not get tangled or tangled, and allows for sharp transmission of fish movements.

) 8 Aromatic polyesters exhibiting anisotropy when melted are formed from aromatic dicarboxylic acids, aromatic diols and/or aromatic hydroxycarboxylic acids, and derivatives thereof, and in some cases, these and alicyclic diols, Copolymers with aliphatic diols and derivatives thereof are also included.

Here, the aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, 4,4°-dicarboxydiphenyl, 2.6
-dicarboxynaphthalene, 1,2-bis(4-carboxyphenoxy)ethane, etc., and their alkyl, aryl, alkoxy, and halogen group-substituted products.

Aromatic diols include hydroquinone, resorcinol, 4
．． 4′-dihydroxynaphthalene, 4.4°-dihydroxybenzophenone, 4.4′-dihydroxydiphenylethane, 4.4°-dihydroxydiphenyl ether, 4.4°-dihydroxydiphenyl sulfide,
2.6-dihydroxynaphthalene, 1.5-dihydroxynaphthalene, 1.4-dihydroxynaphthalene, 2.
Examples of the aromatic hydroxycarboxylic acids include 2'-bis(4-hydroxyphenyl)propane, etc., and derivatives of these with alkyl, aryl, alkoxy, and halogen groups substituted with p-hydroxybenzoic acid, m-hydroxybenzoic acid, and 2'-bis(4-hydroxyphenyl)propane. Examples include -hydroxynaphthalene-6-carboxylic acid, 1-hydroxynaphthalene-5-carboxylic acid, p-4=hydroxyphenylbenzoic acid, and their alkyl, aryl, alkoxy, and halogen group-substituted products.

Examples of alicyclic dicarboxylic acids include trans-1,4-dicarboxycyclohexane, cts-1,4-dicarboxycyclohexane, and alkyl, aryl,
Nuclear substitution products of alkoxy and halogen groups can be mentioned.

Examples of alicyclic and aliphatic diols include xylylene diol, ethylene glycol, trans 1,4-dihydroxycyclohexane, cis-1,4-dihydroxycyclohexane, and their alkyl, aryl, alkoxy, and halogen group substituted products. It will be done.

The aromatic polyester used in the present invention can be obtained by polycondensing the above-mentioned raw materials or combinations of their derivatives by esterification or transesterification reaction. ) p-hydroxybenzoic acid residue 40~
A copolyester consisting of 70 mol%, 15 to 30 mol% of the above aromatic dicarboxylic acid residues, and 15 to 30 mol% of aromatic diol residues, (2) terephthalic acid and/or isophthalic acid, chlorohydroquinone, phenylhydroquinone, and/or Alternatively, copolyesters consisting of hydroquinone, (3) copolyesters consisting of 20 to 80 mol% of p-hydroxybenzoic acid residues and 20 to 80 mol% of 2-hydroxynaphthalene-6-carboxylic acid residues, and the like.

As the polycondensation reaction, known bulk polymerization, solution polymerization, suspension polymerization, etc. can be adopted, and in some cases, Sb is
, a polymerization catalyst such as a Ti or Ge compound, a stabilizer such as a phosphorous compound, a filler such as T i Ox, Ca COs, talc, etc. can be added.

The obtained polymer may be used as it is, or may be heat-treated in powder form in an inert gas or under reduced pressure to be used as a sample for spinning, or it may be used after being granulated using an extruder.

The melt spinning equipment includes a plunger with a heating control mechanism, a melting part such as a screw, a measuring part such as a gabump,
Any spinning head including a spinneret can be used.

The temperature suitable for spinning is 280-420°C, preferably 300-400°C. If the temperature is lower than 280°C, the load on the apparatus will be large, the uniformity of the sample melt will be insufficient, and if the temperature is high, decomposition may occur, making it impossible to perform stable spinning.

As the spinneret used for spinning, commonly used spinnerets can be used as they are, but preferred spinnerets have a hole diameter (d) of 0.15 m or less and a ratio of hole length (2) to hole diameter <1. /d) is preferably 0°8 or more.

The obtained fibers can be used as they are, but they may also be used after being subjected to stretching, heat treatment, or a combination of these operations.

The fiber thus obtained has high strength, high modulus, low elongation and low water absorption, but if the waist is too large, use a thin rather than a thick diameter monofilament for adjustment of the total rebound force against bending. It can also be used by twisting, knitting, or weaving filaments with multiple diameters.

<Effects of the Invention> Since the fibers used in the present invention have high strength, the thread diameter can be made thinner to make the necessary strong fishing line, and the high elastic modulus makes it stiff and less likely to get tangled or tangled, while at the same time it has good compatibility with water. Because it has less water and is denser than water, it sinks easily in water, and because it is not absorbent, it is not heavy and easy to maintain. Furthermore, low elongation,
Due to its high elastic modulus, even the slightest fish signal is sensitively transmitted to the hand and the tip of the rod. Also, the fact that it is a transparent thread can be utilized.

<Examples> Examples are shown below to facilitate understanding of the present invention, but
These examples are merely illustrative, and the gist of the present invention is not limited thereto.

Note that the specific values in the examples were measured and calculated as follows.

(1) Place the optically anisotropic polymer powder when melted on a heating stage, and hold it at 25° under polarized light.
The temperature was raised at a rate of C/min, and observation was made with the naked eye.

(2) Fiber tensile test Measurement was carried out using a tensilon type tensile tester manufactured by Toyo Baldwin at a chuck distance of #20 and a tensile speed of 2 m/min. The number of samples was 24, and the average value excluding the highest and lowest values was shown.

Reference example p-acetoxybenzoic acid 7.2 kg (40 mol), terephthalic acid 2.49 kg (15 mol), isophthalic acid 0.
83 kg (5 mol) and 5.45 kg (20.2 mol) of 4.4'-diacetoxydiphenyl were charged into a polymerization tank with comb-shaped stirring blades, heated to 330''C while stirring under nitrogen gas atmosphere. Polymerization was carried out for 3 hours.

The acetic acid produced during this time was removed, polymerization was carried out with strong stirring, and the polymer was taken out after cooling, and the yield was 10.8
The weight was 8 kg, which was 97.8% of the theoretical yield.

This was ground in a hammer mill to obtain particles of 2W or less, and when treated in a rotary kiln at 280°C for 5 hours under a nitrogen atmosphere, optical anisotropy in the molten state was observed at 350°C or higher.

Example 1 Using the polyester of the reference example, melt spinning was performed using a screw type extruder with a diameter of 30 mm.

The spinneret has a hole diameter of 0.07 mm, a hole length of 0.14 mm, and a diameter of 30 mm.
The number of holes is 2.

A single yarn with a denier of 2.87 (about 17 μm in diameter) was obtained, which was treated in dehumidified air at 320°C for 3 hours.

The density of the obtained fiber was 1.40 g/cc, and the strength was 336.
kg/lB11", elongation at break is 2.7%, and elastic modulus is 12.67 on/m".

After applying a silicone oil, the fibers are twisted so that there is one twist per 1C, and then an epoxy oil containing a red pigment (a color that fish prefers) is applied to lightly harden the fibers. I used it as a fishing line.

It handled well, sank quickly in the water, and fish could be clearly seen from a depth of about 5 meters.

Example 2 The polyester of the reference example was used as a spinneret with a pore size of 0.
Melt spinning was carried out in the same manner as in Example 1, except that a material having a diameter of 12 mm, a hole length of 0, 36 holes, and 24 holes was used. A yarn with a denier of 29.8 (about 55 μm in diameter) was obtained and treated in dehumidified air at 320° C. for 13 hours.

The density of the obtained fiber was 1.38 g/cc, and the strength was 205
kg/body 2, elongation at break 2.8%, modulus of elasticity 7, 6
7on/m2.

This fiber was treated and post-processed in the same manner as in Example 1.

As with the fishing line of Example 1, it was easy to handle, had a fast sinking speed in water, and was clearly able to catch fish from a depth of about 5 m.

Claims (1)

[Claims] Tensile breaking strength is 100kg/mm^2 or more, density 1
．． Fishing line made of aromatic polyester fiber of 38 g/cc or more.