JPH0723564B2 - Polyamide monofilament - Google Patents

Description

TECHNICAL FIELD The present invention relates to a polyamide monofilament having extremely excellent flexibility.

(Prior Art) Generally, a monofilament is an expression used in comparison with a multifilament, but not only does it indicate that the number of convergence is singular, but as a common knowledge among those skilled in the art, a line relatively thicker than a multifilament is used. Means a thread of diameter.
However, there is not always a clear boundary point of the wire diameter between the multifilament and the monofilament.

Generally, regarding the softening of fibers, even in the case of multifilaments, it may be required in relation to the drape property and the feel of the woven fabric, but especially in the case of monofilaments, the large wire diameter is as described above. Due to this, there are numerous fields in which flexibility is required. That is, since the bending hardness of the yarn is proportional to the fourth power of the wire diameter, especially in the case of a very thick monofilament, softening is extremely significant depending on the application.

A typical technique of the conventionally known monofilament softening technique is a method of adding a so-called plasticizer to the monofilament material, and examples of the plasticizer used for the polyamide monofilament include Nn butylbenzene sulfonamide, Examples thereof include N-n-butyl cyclohexane-sulfonamide, N-tert-butyl-2-benzothiazolyl-sulfenamide and acetic acid-butylbenzene-sulfonamide.

In addition, as another method of monofilament softening technology,
A method of copolymerizing a polymer which is a monofilament material, for example, in the case of polyamide, a method of copolymerizing nylon 6 with a small proportion of nylon 66 is known.

However, in the above-mentioned conventional method, although the flexibility can be considerably increased, even if it is applied to a polyamide monofilament, its flexibility is limited, and in reality, sufficient modification cannot be achieved.

(Problems to be solved by the present invention) Therefore, as a result of intensive investigations by the present inventors for the purpose of obtaining a polyaid monofilament having more excellent flexibility than that obtained by the conventional technique, the material polyamide was selected. On the other hand, the inventors have found that the above object can be effectively achieved by adding a specific compound in a specific ratio and melt-spinning the compound, and thus arrived at the present invention.

(Means for Solving Problems) That is, the present invention provides polycaproamide (nylon 6) 90
To 97 parts by weight and 3 to 10 parts by weight of ε-caprolactam for a total of 100 parts by weight, ethylene bisstearylamide
The present invention provides a polyamide monofilament, which is obtained by melt spinning a composition to which 0.2 to 0.5 part by weight is added.

Nylon 6 used in the present invention is a polycaproamide homopolymer or a copolyamide having this as a main component.

The ε-caprolactam used in the present invention is a raw material for polymerization of nylon 6, and a considerable amount of unreacted monomer remains in the nylon 6 immediately after polymerization.
It is subjected to melt spinning after being extracted so as to have the following residual amount. Further, it is known that ε-caprolactam exerts a plasticizing effect on polyamide to some extent, but the degree of softening due to it depends on the plasticizer represented by Nn-butylbenzenesulfonamide. Far less effective. However, the present inventors have found that by using a certain processed product together with ε-caprolactam as the second additive, the flexibility of the obtained monofilament is increased as compared with the case where ε-caprolactam alone is added to the polyamide. They found that they could improve synergistically and dramatically.

Therefore, the second additive in the present invention is ethylene bisstearylamide, and the specific compound is
The flexibility of the polyamide monofilament can be dramatically improved only when it is added together with caprolactam. Ethylene bisstearylamide is 140 ℃
It is one of the waxes having the above melting points, and is generally an internal smoothing agent or mold release agent in molding plastics represented by polyamide, a smoothing agent in casting, a lubricant in iron wire drawing, and an antiblocking agent in adhesive tape. It is a compound used as such.
It is also known that ethylene-bisstearylamide is added to a synthetic resin monofilament material and melt-spun, but in this case, as a smoothing agent, stains on the spinning nozzle are suppressed, or wax performance is utilized. It is also intended to suppress the generation of fine crystals during cooling of the spun yarn and to maintain the transparency of the monofilament.By using this together with ε-caprolactam, the technical idea of improving the flexibility of the polyamide monofilament is Not known at all.

Therefore, in order to achieve the object of the present invention, 0.2 to 0.5 parts by weight of ethylene bisstearyl amide is added to 100 parts by weight of 90 to 97 parts by weight of polyamide and 3 to 10 parts by weight of ε-caprolactam. In particular, it is necessary to add 0.25 to 0.35 parts by weight.

Here, if the amount of ε-caprolactam is less than 3 parts by weight, the effect of improving the flexibility of the monofilament is poor.
If it exceeds the weight part, not only the spinning property of the monofilament becomes unstable but also other physical properties of the monofilament itself are hindered, which is not preferable.

On the other hand, the amount of ethylene bisstearylamide added is 0.2
If it is less than 1 part by weight, the effect of improving the flexibility of the monofilament is poor, and if it exceeds 0.5 part by weight, the wax effect becomes too strong and the pushing property of the raw material into the screw of the spinning extruder becomes unstable.

The addition of ε-caprolactam and ethylene bisstearylamide to polyamide is a dry blending method, a method of dry blending ε-caprolactam into chips obtained by adding ethylene bisstearylamide during the polymerization of polyamide, and adding a large amount of additives. Examples thereof include a method of mixing the master chip and the polyamide chip added to the above and a method of adding the additive from the vent of the extrusion spinning machine.

The melt-spinning method of the above polyamide composition is a usual means for spinning polyamide monofilaments, for example, a melt-spun filament is introduced into a cooling bath to be cooled and solidified, and subsequently introduced into a drawing atmosphere such as hot water or heated air. A method of stretching to a desired stretching ratio can be adopted.

The polyamide monofilament of the present invention thus obtained,
It has not been obtained so far or has excellent flexibility, and is expected to be applied to various fields such as yarn for fishing, yarn for ropes and cutter cords for mowers.

(Operation of the Invention) In the flexible polyamide monofilament of the present invention,
Although the reason why excellent flexibility is exhibited by the combined addition of ε-caprolactam and ethylene / bisstearylamide is not clear, the plasticizing action of ε-caprolactam and the crystallization inhibiting action of ethylene / bisstearylamide are synergistic. And ε-caprolactam act as a solvent for ethylene bisstearylamide, which improves the uniform dispersibility of both and enhances the action and effect of the additive itself.

The effects of the present invention will be described in more detail below with reference to examples.

The tensile strength and tensile elongation in the examples are JIS
It is a value measured according to the regulation of L-1013.

In addition, the bending hardness, which is a measure of flexibility, is placed on two stainless steel rods with a diameter of 5 mm, which are placed in parallel at an interval of 30 mm, and the measured object (monofilament) is placed in a direction perpendicular to them. Hang a hook with a diameter of 5 mm in the center,
The maximum stress (Kg) when pulling out vertically between two stainless steel bars was expressed. The pulling speed for moving the hook was 50 mm / min, and the atmospheric conditions during measurement were 20 ° C and 6
It was set to 5% RH. The monofilament to be measured was left in the atmosphere of 20 ° C. and 65% RH for 24 hours or more in advance and then used for the measurement.

Further, regarding the spinning stability, the state during continuous extrusion prevention was observed under the above conditions, and evaluated according to the following three criteria.

○ …… Good △ …… Slight instability of raw material × …… Instability of raw material instability (Example) Relative clay measured with 98% concentrated sulfuric acid as a solvent against nylon 6 of 4.2, as shown in the table Dry-blended compositions with various changes in the types and combinations of additives and addition amounts were melt-spun at temperatures of 260 ° C, cooled and solidified in a cooling water bath of 20 ° C, and subsequently heated in a 95 ° C hot water bath. In 4
It was drawn twice to obtain drawn monofilaments each having a diameter of 2 mm.

The bending hardness, tensile strength and tensile elongation of each of the obtained monofilaments are shown in the table together.

As is clear from the results in the table, the polyamide monofilaments (2 to 5, 8 and 9) of the present invention have a significantly reduced flexural hardness, and due to the synergistic effect of the combined addition of ε-caprolactam and ethylene-bistearylamide, Flexibility has improved dramatically.

On the other hand, if the addition amount of ε-caprolactam is small (No. 1) even in the case of combined addition, the softening effect is unsatisfactory, and if the addition amount of ε-caprolactam is too large (No. 1).
In 6), pushing the raw material into the spinning machine becomes unstable. Similarly, the softening effect is unsatisfactory when the addition amount of ethylene / bisstearylamide is small (No. 7), and when the addition amount is too large (No. 10), the raw material is pushed into the spinning machine. Becomes unstable. Further, when 7 parts by weight of ε-caprolactam is added alone (No. 17), the softening effect can be seen, but the degree thereof is extremely small as compared with the present invention, and only 0.3 parts by weight of ethylene bisstearylamide is used alone. When added (No. 16), almost no softening effect is exhibited.

Furthermore, when Nn butylbenzene sulfonamide, which is a typical plasticizer of polyamide, is added in place of ε-caprolactam (No. 11 to 13), no additive is added (No. 18). Although the flexibility is slightly improved as compared with (1), the degree thereof is considerably smaller than that of the present invention. Also N
-When using n-butylbenzene-sulfonamide together with ethylene-bisstearylamide (No.14, 15)
In addition, the softening effect of the plasticizer is limited, and the synergistic effect of the combined use cannot be obtained.

(Effects of the Invention) As described above, the polyamide monofilament of the present invention has flexibility not conventionally obtained, and is used in various types of raw yarns for fishing, raw yarns for ropes and cutter cords for mowers. Expected to be applied in the field.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 58-132137 (JP, A) JP 50-12325 (JP, A) JP 50-12328 (JP, A) JP 55- 21064 (JP, B2) JP 59-8300 (JP, B2) JP 47-19612 (JP, B2)

Claims (1)

[Claims] 1. A total of 100 parts by weight of 90 to 97 parts by weight of polycaproamide (nylon 6) and 3 to 10 parts by weight of ε-caprolactam.
0.2 parts by weight of ethylene bisstearylamide
A polyamide monofilament, which is obtained by melt spinning a composition containing 0.5 part by weight.