JP2000273721A - Nylon/polyester-based monofilament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject monofilament having excellent (knot) strength and surface smoothness, useful for a fishing line capable of sensitively reflecting a bite by mechanically formulating a polyamide-based polymer with a polyester- based polymer to give a composition and integrally spinning the composition. SOLUTION: This monofilament is integrally spun from a composition obtained by mechanically formulating 100 pts.wt. of a polyamide-based polymer such as nylon 6 with preferably 5-25 pts.wt. of a polyester-based polymer such as a polyethylene terephthalate. Preferably a fishing line is produced from a nylon/polyester-based monofilament. The nylon/polyester-based monofilament is preferably produced by subjecting the formulated composition to melt spinning at 290-305 deg.C, drawing the spun yarn in 3.0-3.6 times draw ratio at 80-90 deg.C and then drawing the yarn in 2.0-2.2 times draw ratio at 200-250 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a monofilament suitable for use in fishing lines and the like.

[0002]

2. Description of the Related Art With the increase in popularity of fishing, various materials are used for fishing lines, and various performance improvements are required.
At present, the most frequently used fishing line is a polyamide-based, that is, a nylon-based monofilament, followed by a fluorocarbon-based monofilament. In addition, a small amount of a polyester-based fishing line is also found.

[0003] Among them, a fishing line composed of a polyamide (nylon) monofilament is suitable for being used as a fishing line in that it is inexpensive, has excellent flexibility, and has high strength including knot strength. The surface lubricity and the water absorption (water repellency) are not always sufficient. on the other hand,
Fluorocarbon (fluororesin) monofilament
It has high strength and is superior to nylon-based monofilaments in terms of surface lubricity and water absorption (water repellency), but is inferior to nylon-based in knot strength, and is particularly expensive. In this regard, fishing lines composed of polyester fibers are inexpensive, but have not been widely accepted because they are hard and difficult to use.

Heretofore, methods which have been exclusively employed to improve the disadvantages of the monofilaments used in these fishing lines as far as possible have been to coat or impregnate additives which impart specific properties. Is the way. For example, for the purpose of imparting lubricity to the monofilament, the outer periphery of the filament is coated with a silicone (organic silicon-based resin) water repellent (Japanese Utility Model Publication No. 49-38230), or an organic silicon-based resin or a fluororesin is used. A method has been proposed in which a monofilament is brought into contact with a dispersion of the above to impregnate the resin component into the monofilament (JP-A-60-19).
0266, JP-A-60-224885).
Also, after adding a fluorine-based resin as an aqueous dispersion to a thermoplastic resin such as polyamide and molding, the molded article is brought into contact with the aqueous dispersion of the fluorine-based resin again, so that the surface of the polyamide (nylon) is formed. There is also a method of impregnating with a fluorine-based resin (JP-A-2-269877). However, in such a method of simply coating or impregnating (permeating) the surface of the filament with the modifying additive, if used for a long time, the additive may be separated and the desired effect may be reduced or lost. .

The inventor of the present invention completely differs from the conventional method as described above in that a nylon (polyamide) polymer and a small amount of a fluoropolymer are forcibly mechanically kneaded as in the case of forming a polymer alloy. A technique for obtaining a nylon / fluorine-based monofilament by spinning was proposed (Japanese Patent Application No. 9-159151). This monofilament is suitable for use in fishing lines and the like because it can be manufactured at low cost while having excellent knot strength and surface lubricity, but it does not mean that there is still a point to be improved. For example, it is more preferable as a fishing line to have a more excellent property of transmitting a "hit" when a fish tries to eat to a fisherman.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a relatively low-cost supply, excellent strength (including knot strength) and surface lubrication, and sensitively reflecting the "hit" of fish. An object of the present invention is to provide a new type of filament suitable as a fishing line exhibiting such characteristics.

[0007]

According to the present invention, a monofilament obtained by integrally spinning a polyamide polymer and a polyester polymer in accordance with the technique devised by the present inventors is a fishing line. It has been found that the present invention exhibits various characteristics suitable for being used as such, and has led to the present invention.

[0008] That is, the present invention provides a nylon / polyester monofilament characterized by being integrally formed from a composition obtained by mechanically kneading a polyamide polymer and a polyester polymer. According to a particularly preferred embodiment of the present invention, the polyester-based polymer is kneaded at a ratio of 5 to 25 parts by weight with respect to 100 parts by weight of the polyamide-based polymer. Further, the present invention provides a fishing line comprising a nylon / polyester monofilament as described above.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As the polyamide polymer constituting the monofilament of the present invention, various conventionally known nylon polymers can be used. For example, nylon 6 (structural unit: caproamide) can be used. Nylon 66 (structural unit: hexamethylene adipamide), nylon 12 (structural unit: dodecaneamide), nylon 6
10 (Structural unit: hexamethylene sebacide), Nylon MXD6 (Structural unit: meta-xylene adipamide) and other polyamides (nylons) or copolymers thereof, especially nylon 6 as the main component and nylon 6
Nylon 6/66 copolymer and Nylon 6/12 copolymer obtained by copolymerizing Nylon 6 and Nylon 12, and the like, and these can be used in combination.

[0010] The polyester polymer used for the monofilament of the present invention refers to PET (polyethylene terephthalate) which is well known as polyester fiber.
Refers to the PET polymer constituting the fiber, excluding wholly aromatic polyester.

The monofilament of the present invention is obtained by forcibly kneading the above-mentioned polyamide polymer and polyester polymer as they are (usually in the form of respective chips) and then spinning (melt spinning). The monofilament thus obtained is characterized in that the polyester-based polymer is uniformly dispersed in the polyamide-based polymer.

In the monofilament of the present invention, the polyester polymer is kneaded at a ratio of 5 to 25 parts by weight with respect to 100 parts by weight of the polyamide polymer. If the amount of the polyester-based polymer is less than 5 parts by weight, there is a problem that the surface lubrication is unfavorable. On the other hand, if the amount is more than 25 parts by weight, there is a disadvantage that the strength is lowered. The mixture of the polyamide polymer and the polyester polymer may contain other additives such as a heat stabilizer, a polyolefin colorant, a nylon colorant, and a plasticizer.

In order to produce a monofilament from the composition thus kneaded mechanically, a spinning temperature of 280 to 31 is used.
Melt spinning at 0 ° C, preferably 290-305 ° C,
The obtained spun strip is cooled and solidified with an inert liquid (for example, water, glycerin, etc.) to form an undrawn monofilament,
Then, it may be stretched by a conventional method.

At the time of cooling and solidifying the spun yarn, at a position before the yarn starts crystallization, the temperature is 20 to 60 ° C., preferably 3 ° C.
When introduced into a liquid cooling bath at 0 to 40 ° C., a uniform monofilament which is thick and has no spots can be obtained.

The undrawn monofilament is drawn by a multistage drawing method according to a conventional method, for example, at 80 to 95 ° C.
The first-stage stretching is performed in an inert liquid of about 3.0 to 3.6 times, and then 2.0 to 2.2 times in a gas bath (for example, a dry air atmosphere) at 200 to 250 ° C. The second stage stretching is performed at a stretching ratio. After the stretching process, a heat setting or a relaxing process is performed as necessary.

The nylon / polyester-based monofilament of the present invention obtained as described above, when used as a fishing line, not only has excellent strength including knot strength and surface lubricity, but also has an excellent elongation for its strength. Has been confirmed to have a characteristic of being small.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the features of the present invention,
Examples are shown in the following, but the present invention is limited by these examples.
It is not something to be done.Example 1: Monofilament spinning  Nylon 6 / copolymer [Ube as polyamide-based polymer
Kosan 5033T: Nylon 6 (85%) / Nylon 6
6 (15%), relative viscosity 4.2, flexural modulus 95 (Kg /
mm^Two), A monomer content of 4.0% by weight].
And PET (polyethylene) as a polyester polymer
Terephthalate) (Mitsubishi Chemical Novapet, number average molecule)
Amount: about 20,000, viscosity: 2000 at 280 ° C
3000 poise) at the ratio shown in the table below.
Mechanical forcible mixing using a screw-type extruder
It was kneaded and melt-spun at a spinning temperature of 305 ° C. Spinning nose
Installed directly below the cooling liquid level and at a distance of 15 cm
The spun yarn is introduced into the 1.5 m long cooling tank and cooled.
It solidified and was taken off at a speed of 12 m / min. Continue to
2. The draw ratio of the undrawn filament of No. 3 in a water bath at 95 ° C.
Perform first-stage stretching twice, and further dry air atmosphere at 220 ° C.
Second stage stretching so that the total stretching ratio becomes 5.4 times in the atmosphere
And a monofilament with a diameter of 0.25 to 0.26 mm
I got

[0018]Example 2: Measurement of physical properties  Tensile strength (kg), tensile strength of the obtained monofilament
(G / d), tensile elongation (%), knot strength (kg), knot strength
(G / d), knot elongation (%)
Was used to measure the surface lubricity.

The measurement of each physical property was performed in the following manner. Tensile Strength, Tensile Elongation, Tensile Strength: Using a Shimadzu Autograph S-500D, which is a kind of Instron type testing machine, measure the stress until a load is applied to each fishing line sample at a constant tensile strength and cut. , The load at the time of cutting, tensile strength (kg),
The elongation at that time was defined as the tensile elongation (%), and the value obtained by dividing the load at the time of cutting by the cross-sectional area (d: denier) of the yarn was defined as the tensile strength (g / d).

Knot strength, knot elongation, knot strength: After each fishing line was strongly knotted once with a stirrup, a load was applied to each sample at a constant pulling speed using Shimadzu Autograph S-500D in the same manner as described above. The load at the time of cutting was knot strength (kg), the elongation was the knot elongation (%), and the value obtained by dividing the load at cutting by the cross-sectional area of the yarn was knot strength (g / d).

Surface lubricity: Shimadzu Autograph S-500D
The sample was fixed to the chuck below the scissors with a plate made of polypropylene, and the strength (kg) at the time when a load was applied to each sample at a constant tensile speed and the sample was pulled out was used as a measure of the surface smoothness. The smaller this value, the better the surface smoothness.

Table 1 shows the results of the physical property measurement. In the table, PE
The amount of T added is 10% for polyamide-based polymer (5033T).
The ratio is based on 0 parts by weight. Sample No. No. 3 is the sample No. 10923 (pink) as a colorant in the composition of 2
And 11072 (yellow) [manufactured by Dainichi Seika Co., Ltd., nylon 6 masterbatch], respectively, in an amount of 1.5% by weight. Sample NO. Reference numeral 5 is a comparative system comprising 0.25 mm of the nylon / fluorine-based monofilament (containing 1.2% by weight of polyvinylidene fluoride as a fluorine-based polymer) disclosed in Japanese Patent Application No. 9-159151 by the present inventor. . Further, the sample No. 6 is a comparative system consisting of a 0.25 mm monofilament of nylon (5033T) only.

[0023]

[Table 1]

As can be understood from the results shown in Table 1, the nylon / polyester monofilaments (Nos. 1 to 4) according to the present invention were composed of a comparative yarn consisting of only nylon (sample No. 6) and a nylon / fluorine monofilament. Has a tensile strength and knot strength equal to or higher than that of the comparative yarn (sample No. 5), and has an excellent surface lubricity equal to or higher than that of the nylon / fluorine monofilament (sample No. 5). It has the property of low elongation for high strength.

It is expected that such characteristics, when used as a fishing line, sensitively reflect the "hit" of a fish when eating. Therefore, a sensory test as shown in Example 3 below was performed.

[0026]Example 3: Sensory test such as "hit"  The sample No. whose physical properties were measured in Example 2 was used. 2, 5 and 6
Using 10 pieces of fishing with 10 or more years of fishing history,
Conduct a sensory test on the suitability as a fishing line as shown below
Was. 1) Hit: One day using the above line alternately for each angler
I got surf fishing and had a good "touch" feeling
When asked, No. 2> No. 5> No. Order of 6
Said they were good. 2) Long casting: swing twice with each hand
Measure the distance you fly the lure and calculate the average
No. No. 2 (27.2 m), No. 3 (23.5
m), No. 5 (19.8 m). 3 for 2
Flying over 0 m was also observed. 3) Thread: Put the lure in the bush and pull it out
Was used to examine whether or not scabs appeared on the fishing line. N
o. 2 and No. As for the yarn of No. 5, almost all
No. Test several times for yarn 6
Later, obvious scabs were noted.

Claims (3)

[Claims] 1. A nylon / polyester monofilament, which is produced by integrally knitting a composition obtained by mechanically kneading a polyamide polymer and a polyester polymer. 2. The nylon / polyester monofilament according to claim 1, wherein the polyester polymer is kneaded at a ratio of 5 to 25 parts by weight with respect to 100 parts by weight of the polyamide polymer. And fishing line. 3. A fishing line comprising the nylon / polyester monofilament of claim 1 or 3.