JPH06128814A - Polyester-based monofilament - Google Patents

Abstract

PURPOSE:To provide a polyester-based monofilament widely suitable for a marine material such as a fishing line or a fish net or an industrial material such as a tennis gut or a brush. CONSTITUTION:This polyester-based monofilament is produced by blending 0.1 to 30 pts.wt. thermoplastic polyester elastomer composed of a linear polyester or polyether as a soft segment and a carbon ring compound-based polyester as a hard segment with 100 pts.wt. thermoplastic polyester composed of a mixture of 70 to 95 pts.wt. polyethylene terephthalate and 5 to 30 pts.wt. polybutylene terephthalate, using the resultant mixture composition respectively as a sheath part and a core part and melt-spinning them through coextrusion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a co-extruded polyester monofilament whose initial tensile elastic modulus can be freely selected and whose breaking energy is higher than conventional ones. More specifically, it relates to marine products such as fishing line and fishing net, and tennis gut. The present invention relates to a polyester monofilament suitable for industrial materials such as brushes and brushes.

[0002]

2. Description of the Related Art Conventional polyester monofilaments have a high elastic modulus. For example, in a fishing line having a diameter of 0.215 mm, the initial tensile elastic modulus is set to a high value of 950 kg / mm ² or more in relation to the tensile strength. Many. Such yarns have an average elongation to yield point of 1.5-2% and a stress of 0.5-0.7 kg under tensile stress. The average elongation from the yield point at which plastic deformation starts to the fracture is 20%, and the stress from the yield point to the fracture point is 2 kg on average.

The tensile breaking energy is 61.53 kg / mm, which is about 40 kg / mm less than that of nylon monofilament having the same yarn diameter. The breaking energy has a close relationship with the crystallinity and viscoelasticity of the polymer that constitutes the monofilament, and in fishing, it is greatly related to the stickiness of the fishing line against pulling of the fish, that is, the impact absorption. . Further, even in a tennis gut where importance is attached to repulsive force and vibration absorption rather than strength, it can be said that a gut using a polyester monofilament having a high elastic modulus is unsuitable.

In tennis, the utilization of monofilaments is the utility value of the surface, not the utilization of wires. Therefore, when a surface is made of a hard monofilament, the surface becomes the same situation as a plate, for example, and the repulsive force disappears. Therefore, it requires a great deal of force to hit the ball, resulting in a great impact on the hands and elbows, which is not effective as a tennis gut.

[0005]

DISCLOSURE OF THE INVENTION The present invention utilizes the durability characteristic of high elastic modulus polyester monofilaments, and improves the elastic modulus and viscoelasticity (breaking energy) of fishery products such as fishing lines and fishing nets. The present invention intends to provide a polyester monofilament that can be widely applied as a material, an industrial material such as a tennis gut and a brush.

[0006]

That is, according to the present invention,
100 parts by weight of a thermoplastic polyester consisting of a mixture of 70 to 95 parts by weight of polyethylene terephthalate and 5 to 30 parts by weight of polybutylene terephthalate, a chain segment type polyester or polyether as a soft segment and a carbocyclic compound type polyester as a hard segment. 0.1 to 30 parts by weight of a thermoplastic polyester elastomer composed of a composition as a segment is mixed, the sheath portion and the core portion are melted as respective mixed compositions, and spun by co-extrusion to obtain an initial tensile elastic modulus.
400 to 960 kg / mm ² , breaking energy required to break is 70 kg / mm or more in case of tensile break, 5 in case of knot break
It was a polyester monofilament with a weight of 0 kg / mm or more.

The polymer used here is a base polymer having 70 to 95 parts by weight of polyethylene terephthalate (PET),
Compositions with a blend ratio of 5 to 30 parts by weight of polybutylene terephthalate (PBT) are used.

As the chain compound type polyester which becomes the soft segment in the thermoplastic polyester elastomer, polyethylene terephthalate, polybutylene terephthalate, those obtained by copolymerizing these with other sebacic acid component, etc. are used. Those having linear polymers such as polyoxymethylene glycol and polyoxyethylene glycol are used. Further, as the carbocyclic compound-based polyester which becomes the hard segment, one synthesized from an aromatic dicarboxylic acid and a bisphenol component is used. Of these, a thermoplastic polyester elastomer comprising a soft segment polyethylene terephthalate, a hard segment terephthalic acid or isophthalic acid component, and bisphenol A is preferable.

The ratio of soft segment to hard segment of the thermoplastic polyester elastomer is arbitrary,
It can be changed over a wide range according to the application. The mixing ratio of this elastomer to 100 parts by weight of the thermoplastic polyester is
It is in the range of 0.1 to 30 parts by weight. If it is 0.1 parts by weight or less, the initial tensile elastic modulus will be 950 kg or more, and if it is 30 parts by weight or more, the strength will be insufficient, which is not preferable. More preferable range is 1
It is in the range of 20 parts by weight.

The composition ratio of the thermoplastic polyester or polyether elastomer is determined from the viewpoint of the tensile strength retention rate. A composition comprising 70 parts of hard segment and 30 parts of soft segment of the polyester type thermoplastic elastomer is added to the above polyester. After mixing and melt coextrusion,
The polyester monofilament of the present invention is used.

[0011]

[Function] This polyester monofilament has an initial tensile elastic modulus of 400 to 960 kg by forming a core-sheath structure by coextrusion and changing the soft segment and hard segment of the added polyester elastomer to a wide range.
/ mm optionally choose between ^2, moreover, the specific mixing range of polyethylene terephthalate and polybutylene terephthalate as a main material, in the case of fracture fracture energy required for the rupture tensile 70 kg / mm or more, nodules break In case of, it will be over 50kg / mm.

By adjusting the structural ratio of the sheath / core of the polyester monofilament and the mixing amount of the thermoplastic polyester elastomer of the sheath / core by coextrusion, the initial tensile modulus and viscoelasticity ( The breaking energy) can be selected more freely.

[0013]

【Example】

Example 1 The core side of a 35 mm twin-screw extruder has thermoplastic polyester (PET
/ PBT = 75: 25), thermoplastic polyester (PET / PBT = 7 on the sheath side
5:25) and a thermoplastic polyester elastomer were added at a ratio of 70:30, melt-extruded, and then cooled in warm water of 50 to 80 ° C. The temperature of the cooling water is preferably 60 to 70 ° C. Then, the film is stretched in hot water at 85 to 100 ° C. at a draw ratio of 3.0 to 3.6, but a draw ratio of 3.2 to 3.4 is suitable. Furthermore, in a dry heat temperature of 170 to 200 ° C., a stretch of 1.8 to 2.2 times is applied, but preferably a dry heat temperature of 185 to 190 ° C. is 2.0 to
A draw ratio of 2.05 times is good. Finally, heat treatment is 185 ~ 190 ℃
The product is heat-treated in a dry heat at a draw ratio of 0.95 to 0.98 and wound to obtain the title monofilament having a structural ratio of 50:50.

Example 2 Under the same spinning conditions as in Example 1, the polymer is mixed on the core side with thermoplastic polyester (PET / PBT = 75: 25) and thermoplastic polyester elastomer at a ratio of 70:30. The same polymer was added to the sheath side, and after spinning, stretching was performed in the same manner as in Example 1,
Heat treatment is performed to obtain a monofilament.

Example 3 Under the same spinning conditions as in Example 1, the polymer was mixed and charged to the core side with a thermoplastic polyester (PET / PBT = 75: 25) and a thermoplastic polyester elastomer at a ratio of 70:30. On the sheath side, thermoplastic polyester (PET / PBT = 75: 25) and thermoplastic polyester elastomer 50:50 were mixed and charged, and after spinning, stretching and heat treatment were performed in the same manner as in Example 1 to obtain a monofilament.

[0016]

[Table 1]

Comparative examples and physical property tests are as follows. Comparative Example 1 As a comparative example, as a conventional polyester fishing line, a monofilament containing a commercially available ethylene terephthalate unit as a main component was used.

Comparative Example 2 A monofilament fishing line of a nylon copolymer (N-6 / N-66 = 85: 15).

As a physical property test, the initial tensile modulus and resistance were measured according to JIS 1082, and the breaking energy and strength were measured using Shimadzu Autograph S-100D. Table 1 shows the physical properties of the samples of Examples 1 to 3 and Comparative Examples 1 and 2.

[0020]

EFFECTS OF THE INVENTION As is clear from the results of Table 1, the examples have physical properties effective as marine products such as fishing line and fishing net, and the examples have physical properties effective for tennis gut and brush. Therefore, industrially, the coextruded polyester monofilament effective for each application can be obtained by the constitution of the present invention.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location D01F 6/86 301 G 7199-3B 6/92 307 A 7199-3B

Claims (1)

[Claims] 1. A chain compound type polyester or polyether is used as a soft segment or carbocyclic to 100 parts by weight of a thermoplastic polyester comprising a mixture of 70 to 95 parts by weight of polyethylene terephthalate and 5 to 30 parts by weight of polybutylene terephthalate. 0.1 to 30 parts by weight of a thermoplastic polyester elastomer composed of a compound-based polyester as a hard segment is mixed, and the sheath and core are melted as respective mixed compositions and spun by co-extrusion to obtain initial tensile elasticity. Polyester monofilament having a rate of 400 to 960 kg / mm ² , breaking energy required to reach breaking of 70 kg / mm or more in the case of tensile breaking and 50 kg / mm or more in the case of knot breaking.