JPH0316088B2 - - Google Patents

Description

[Detailed description of the invention]

(Technical Field) The present invention relates to an improved nylon thread. More specifically, it relates to colored nylon strings that are high in strength, highly flexible, and have excellent abrasion resistance. (Background technology) Conventionally, nylon threads and Tetron threads have been mainly used as fishing threads such as fishing line, Harris, reel winding line, floats, and lures. In order to impart flexibility to the material, nylon is often used in practical applications by incorporating a plasticizer into it. However, although the flexibility of strings made of plasticized nylon blended with such plasticizers is improved, on the other hand, there is a problem in that the strength of the strings, represented by the tensile strength and knot strength, is inhibited by the plasticizer. In addition, nylon fishing rods are generally transparent and difficult to distinguish for anglers, making it difficult to visually assess them when fishing, for example, so they are usually used in a form containing a coloring agent such as fluorescent dye. In this case, there is a problem with the dispersibility of the colorant, which impairs the strength and flexibility of the string. In order to improve such shortcomings, for example,
As shown in Japanese Patent No. 61592, the fluorescent dye component and the nylon monomer are reacted in advance, the modified monomer is polymerized, and the polyamide is mixed with a plasticizer and spun to obtain colored, and A method for obtaining nylon fibers with excellent properties such as flexibility has been proposed, but this method uses a special fluorescent dye component, requires a complicated reaction process with the nylon monomer, and has the problem of poor production efficiency. On the other hand, ordinary colored and/or plasticized nylon threads have poor abrasion resistance, so when they come into contact with rocks during use, they cause so-called rock shear, which damages the surface of the threads and causes thread breakage. It has the disadvantage of being easily damaged by rock slippage, and even if the tensile strength and flexibility are sufficiently satisfied, it is difficult to avoid damage to the threads caused by rock slips. (Purpose of the Invention) The present invention was made in view of the above circumstances, and specifically provides a nylon thread that is colored to a desired degree, has high strength and flexibility, has excellent abrasion resistance, and does not cause rock slippage. The purpose is to provide the following. (Disclosure of the Invention) In order to achieve the above object, the present inventors improved nylon fibers containing plasticizers and colorants, and as a result of intensive studies to eliminate their drawbacks,
By melt-spinning a composition in which polycaprolactam or a copolyamide mainly composed of caprolactam, which has a specific fairly high relative clay content, is used as the material nylon, and a specific amount of polyethylene is further blended with the specific amount of a plasticizer and colorant. , has the desired color tone, suppresses the decrease in strength and flexibility due to the combination of plasticizers and colorants, maintains the original strength and plasticizing effect of nylon thread well, and has extremely improved abrasion resistance. They discovered that colored and plasticized nylon fibers can be obtained and completed the present invention. That is, the present invention blends 3 to 10 weight % of a plasticizer, 0.05 to 0.5 weight % of a colorant, and 0.5 to 5 weight % of polyethylene to polycaprolactam or a copolyamide containing 50 weight % or more of caprolactam with a relative viscosity of 3.50 to 4.00. The purpose of the present invention is to provide a thread formed by melt-spinning the composition. The polymer materials used in the present invention are polycaprolactam (hereinafter referred to as nylon 6) and copolyamides containing 50% by weight or more of caprolactam, and the copolyamides mentioned here include nylon 6/66, nylon 6/6I, and nylon 6. /6T, nylon 6/610, nylon 6/612, nylon 6/
12, nylon 6/66/6I, nylon 6/66/610,
Examples include nylon 6/66/12 and nylon 6/11, among which nylon 6/66, which is composed of 75 to 95% by weight of caprolactam and 25 to 5% by weight of hexamethylene diammonium adipate, is most preferably used. Note that a small proportion of other homopolyamides or copolyamides may be blended with these nylon 6 or copolyamides.
These nylon 6 and copolyamides have a relative viscosity (ηγ) in the range of 3.50 to 4.50, particularly 3.60 to 4.00, measured at 25°C using an Ostwald viscometer using a solution of 1% by weight of the polymer dissolved in 98% concentrated sulfuric acid. It is important that
Exceeding this is not preferable because spinning becomes difficult. The plasticizer used in the present invention is N-ethyl-
Sulfonamide plasticizers such as o.p-toluenesulfonamide, N-nbutyl-benzenesulfonamide, p-toluenesulfonamide, N-cyclohexyl-p-toluenesulfonamide and N-nbutyl-p-toluenesulfonamide. ,
Benzoate ester plasticizers such as p-oxybenzoic acid-2-ethylhexyl ester and alcohol plasticizers such as 2-methyl-2,4-pentanediol can be used, but sulfonamide plasticizers have particularly favorable effects. can get.
The amount of these plasticizers added is 1 to 1 to
10% by weight, especially 3 to 8% by weight, is suitable;
If it is less than 8% by weight, the flexibility is insufficient;
Exceeding this is not preferable because the strength decreases significantly. The coloring agent used in the present invention is not particularly limited to various dyes and pigments that are normally used for coloring polyamides, and includes organic colorants such as phthalocyanine, azo, butt, dioxazine, and quinacridone, and cadmium. Desired colorants can be selected from inorganic colorants such as , red iron type, copper type, and organic/inorganic fluorescent colorants, among which orange or yellow type fluorescent colorants are suitable. Incidentally, these colorants can also be added (dosing) during polymerization of polyamide. The amount of the coloring agent added is preferably 0.05 to 0.5% by weight, particularly 0.1 to 0.4% by weight, based on the polyamide. If it is less than 0.05% by weight, the desired degree of coloring cannot be obtained;
Exceeding this percentage by weight is not preferable because the strength decreases significantly. The polyethylene used in the present invention functions to improve the abrasion resistance of the thread made of the above-mentioned polyamide, plasticizer, and colorant, and to maintain good strength. Commercially available low, medium, and high density polyethylenes can all be used as the polyethylene, but the most desirable effect is achieved when using high density polyethylene, especially high density polyethylene with a high melt index. can get. The appropriate amount of polyethylene to be added is 0.1 to 5% by weight, especially 0.3 to 3% by weight, based on the polyamide.If it is less than 0.5% by weight, the effect of improving wear resistance will be small, and if it exceeds 5% by weight, the polyamide itself will deteriorate. This is not preferable because it impairs excellent properties such as strength. When producing the threads of the present invention, ordinary melt spinning, stretching and heat setting conditions can be applied as they are. For example, a method in which a plasticizer and a coloring agent are added during the polymerization of polyamide and then polyethylene is added to the spun-dyed and plasticized polyamide, a method in which a plasticizer and polyethylene are added to a spun-dyed polyamide, and a method in which a plasticizer and a coloring agent are added to the spun-dyed polyamide; After a composition is obtained by a method of simultaneously mixing four polyethylenes, this is melt-mixed in an extruder and extrusion-spun. Next, the spun yarn is cooled as necessary, then stretched to an appropriate magnification, for example, 3 to 8 times, and further heat-set as necessary to obtain a desired monofilament (tegus). The appropriate fineness of the thread is 40 to 4,400 deniers, and the thickness can be selected depending on the purpose of the thread. The obtained tegus is made into pieces or skeins and made into products. The thus-formed thread of the present invention is a colored thread that is highly strong, highly flexible, has excellent abrasion resistance, and is resistant to thread breakage, and can be expected to be widely used as a variety of fishing lines depending on its fineness. The present invention will be further explained below with reference to Examples. Example Nylon 6/66 (90/10 weight ratio) with a relative viscosity of 3.70
A. “Topcizer No. 3” manufactured by Fuji Amido Chemical Co., Ltd. (H-ethyl-op) was used as a plasticizer for the pellets.
- toluenesulfonamide) or "Plastomol BMB" (N-n butylbenzenesulfonamide) manufactured by B. Basf, "G-8" manufactured by Sanyo Kako Co., Ltd. (yellow fluorescent pigment) as a coloring agent and as a wear resistance improver. Mitsui Petrochemical Co., Ltd. “HI-”
ZEX2100J" (high-density polyethylene, melt index = 6.5) was dry blended at the ratio shown in Table 1, and this was fed into a 40 mmΦ melt extruder and melted. The yarn was spun from a spinneret.Then, the spun yarn was solidified in water at 10°C, and then hot-stretched to 5.4 times at 150°C to obtain monofilaments of 660 denier. Table 1 shows the results of evaluating the various properties of TEGUS. The characteristics of TEGUS were evaluated using the following methods. Strength: Measured according to the JISLI013 method. Flexibility: 5 cm Cut the strings to length, and then
The center part was placed between two 10 mm fulcrums, a load was applied to the center part to bend it, and the maximum load value (g) when the thread fell out from between the two fulcrums was measured. Abrasion resistance: Wrap #320 sandpaper around the surface of a rotating body with a diameter of 50 mm and rotate it at 180 revolutions per minute. On the other hand, a load of 33 g was applied vertically to the thread, and it was brought into contact with the rotating body at an angle of 90°, and the number of rotations (times) of the rotating body until the thread was cut was measured. Color tone: Observation with the naked eye.

【table】

[Table] As is clear from Table 1, the threads of the present invention have high strength and excellent flexibility, and have significantly improved abrasion resistance, and when actually used as sea fishing line, It is easy to distinguish due to its fluorescent color, has good sliding properties, does not stick to rods, and exhibits excellent properties such as being resistant to scratches even when it comes into contact with rocks on the ocean floor.

Claims (1)

[Claims] 1 Polycaprolactam with a relative viscosity of 3.50 to 4.50 or a copolyamide containing 50% by weight or more of caprolactam, 1 to 10% by weight of a plasticizer, and a colorant.
Tegusu is made by melt-spinning a composition containing 0.05 to 0.5% by weight and 0.1 to 5% by weight of polyethylene.