JPH0649781A - Conjugated yarn - Google Patents

Abstract

PURPOSE:To produce the subject conjugated yarn made of a high-strength fiber for a rope or a net. CONSTITUTION:In a thermoplastic resin exhibiting <=200kg/mm<2> elastic modulus, >=40vol% reinforcing filaments containing continuous filaments in an amount of >=90wt.% are embedded to obtain a yarn. The resultant yarn is covered with a thermoplastic resin filament or tape, thus affording the objective conjugated yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite yarn devised so that high-strength fibers which are easily broken can be used as ropes and nets.

[0002]

2. Description of the Related Art Although glass fiber, carbon fiber, alumina fiber and the like have high tensile strength, they are weak in bending and friction and it is difficult to process these fibers alone into a rope or net. In order to improve the processability, these fibers are bundled and dissolved in a solvent, or an emulsion type epoxy resin or urethane resin is applied as a sizing agent at a concentration of 1 to 5 wt% to prevent friction damage during processing. It is commonly adopted to prevent.

[0003]

However, even if these fibers coated with a sizing agent are processed into ropes or nets, the sizing agent has a thin protective film and the protective film is destroyed by friction or bending during use. Many phenomena of fiber damage were observed. Further, as a method for thickening the protective film of the fibers provided with these sizing agents, there is a method of impregnating a fiber bundle with a low-viscosity unsaturated polyester resin or an epoxy resin and performing reaction solidification, but these resins are solidified. The subsequent fiber bundle has a high rigidity due to the improvement of the elastic modulus accompanying the solidification of the resin, and has a drawback that it is not suitable for bending. Then, this invention makes it a technical subject to provide the composite yarn protected by the highly flexible resin.

[0004]

The inventors of the present invention have completed the present invention as a result of intensive studies to solve the above problems. That is, the present invention is composed of 9 filaments.
0% by weight or more is continuous fiber, and the filament is 40
Contains more than volume% and has a filament elastic modulus of 200 k
A composite yarn characterized in that a yarn embedded with a thermoplastic resin of g / mm ² or less is covered with a thermoplastic resin filament or tape.

The present invention will be described below. In the present invention, the filament means a single fiber having a diameter of 50 μm or less, which has high strength and high elasticity, such as glass fiber, carbon fiber, boron fiber, silicon carbide fiber, and alumina fiber, but which is easily damaged by bending or friction. Since these filaments are thin and easy to cut, they are not used as a single filament, and usually a bundle of 200 to 12,000 monofilaments is used as one unit. 90% or more of the filaments are continuous in order to protect the strength of the rope or net and to prevent the fibers from becoming fluffy and appearing on the surface of the coating resin when embedded in the thermoplastic resin. It is preferably a fiber. The filament content is a factor that determines the strength of the yarn, and is preferably 40% by volume or more as a practically usable amount.

The thermoplastic resin for embedding used in the present invention plays a role of protecting the filament, and the embedding of the filament must be at a level at which the adhesion strength between the filament and the embedding resin is improved. Therefore, it is preferable that the filament surface is treated with a surface treatment agent for improving the adhesion with the embedding resin, for example, a silane coupling agent alone or a sizing agent containing the silane coupling agent.
In the case of glass fiber, it is necessary to select an optimum coupling agent according to the resin to be combined, and specific examples thereof will be listed below.

For nylon resins, γ-aminopropyl-trimethoxysilane and N-β- (aminoethyl)-
γ-aminopropyl-trimethoxysilane or the like is used. If it is a polycarbonate resin, γ-aminopropyl-trimethoxysilane, N-β- (aminoethyl)-
γ-aminopropyl-trimethoxysilane or the like is used.

In the case of polyethylene terephthalate or polybutylene terephthalate, β- (3,4-epoxycyclohexyl) ethyl-trimethoxysilane, γ-
Glycidoxy-propyltrimethoxysilane, γ-aminopropyl-trimethoxysilane and the like are used. For polyethylene or polypropylene, vinyltrimethoxysilane, vinyl-tris- (2-methoxyethoxy) silane, γ-methacryloxy-propyltrimethoxysilane, γ-aminopropyl-trimethoxysilane and the like are used.

If polyphenylene oxide, polyphenylene sulfide, polysulfone, polyether sulfone, polyether ketone, polyether ether ketone, polyimide, polyarylate, or fluororesin is used, the above-mentioned coupling agent can be used, but other than that, In addition, N-β- (aminoethyl) -γ-aminopropylmethylsimethoxysilane, γ-chloropropylmethyldimethoxysilane, γ-mercaptopropyltrimethoxysilane, p-aminophenyltriethoxysilane and the like can be used.

In the case other than glass fiber, when considering the physical properties first, it may be necessary not to use a sizing material or a coupling agent, but since the workability is deteriorated, an amine-curable epoxy resin is used as a coupling agent. In many cases, bisphenol-A type epoxy resin, epoxy novolac resin, alicyclic epoxy resin, aliphatic epoxy resin, glycidyl ester type resin can be used. The method of applying the coupling agent to the fiber surface is as follows.

That is, the fiber from which the sizing material has been removed is completely impregnated with a solution in which the coupling agent is dissolved in an amount of 0.1 to 3% by weight by means such as dipping or spray coating. The fiber containing the coupling agent solution is dried at 60 to 120 ° C. to react the coupling agent with the fiber surface. The drying time is sufficient to evaporate the solvent, which is about 15 to 20 minutes. The solvent that dissolves the coupling agent, depending on the surface treatment agent used, when using water adjusted to a pH of 2.0 to 12.0 and an organic solvent such as ethanol, triene, acetone, xylene, alone, Alternatively, they may be mixed and used.

To the embedding resin, it is significant to add a modifier capable of enhancing the affinity with the surface treatment agent, for example, prepropylene grafted with maleic anhydride. The adhesion strength between the filament and the embedding resin varies depending on the intended use, but it is necessary that the resin does not fall off from the filament when it is processed into a rope or net as a product and used after processing. Also, the embedding resin is preferably highly flexible in order to prevent the filament from being damaged by the rigidity of the embedding resin when the resin embedding filament is bent, and the resin itself has an elastic modulus of 200 kg /
Those of mm ² or less are preferable.

Typical resins used are polypropylene, polyethylene, polyester elastomers, thermoplastic polyurethanes, styrene-butadiene copolymers, ionomer resins, rubber-modified nylons, polycarbonate-polypropylene terephthalate alloys and the like. Particularly preferred are polypropylene, polyethylene simple substance or ethylene-propylene copolymer, and resins having low elastic modulus such as ethylene-propylene rubber,
Those modified with styrene-butadiene rubber or the like are preferable.

The thermoplastic resin filaments and tapes used for coating may be those generally used for ropes, nets and the like. Especially, the filaments preferably have a denier of 10 to 100, and the tape has a width of 0.1 to 100. A material having a thickness of 10 mm and a thickness of 30 to 200 μ is used, and polypropylene, polyethylene, nylon, polyethylene terephthalate,
Those manufactured from vinylidene chloride or the like are preferable. Further, the covering filament includes a monofilament in which the filament is a continuous fiber and a yarn obtained by spinning staple staple fibers. The coating filament or tape is for protecting the resin-embedded filament yarn from friction and abrasion when it is practically used as a rope or net, and it is preferable that the coating filament or tape is completely coated, but depending on use conditions, Since there is a difference in the degree of coating, some uncoated portions may exist.

The composite yarn of the present invention has a modulus of elasticity of 200 kg /
A resin of mm ² or less is passed through a bath where the resin is heated and melted to form a yarn embedded with a thermoplastic resin, which is then coated with a thermoplastic resin filament or tape, and then heat-treated to a temperature close to the melting temperature of the resin. Manufactured.

[0016]

The details of the present invention will be described below with reference to typical examples. Example 1 1800 [gamma] -aminopropyl-trimethoxysilane coated glass fibers having a diameter of 13 [mu] m and bundled with 1,800 glass filaments were bundled in a non-twisted state and the elastic modulus was 150 kg /
25 mm ² of maleic anhydride modified polypropylene composition
The yarn was manufactured by passing through a bath melted by heating at 0 ° C. The yarn had a diameter of 1.0 mm. From this yarn, 10 short yarns with a length of 15 mm were cut out from an arbitrary place, and these 10 yarns were used as a test body according to JIS K.
According to 7502, the glass fiber content Wf was measured. From this Wf, the fiber volume% Vf was calculated by the following relational expression. Vf = (Wf ÷ Fd) ÷ {(Wf ÷ Fd + (100-W
f) ÷ Rd} × 100% However, Fd is the specific gravity of the glass fiber, 2.55 Rd is the specific gravity of the maleic anhydride-modified polypropylene composition, 0.91 Continuity was measured. Visual inspection revealed no filaments on the outside of the yarn. Further, the continuity of the filament is measured by cooling the resin component of the yarn of 1 m and then measuring the weight W0 of the glass fiber. After that, holding the central portion of the glass fiber, shake it up and down 10 times with an amplitude of 100 mm. After the shaking, the glass fiber weight W1 is measured. W1 ÷ W0 × 100% is defined as filament continuity.

Next, a rope having a diameter of 2 mm was prepared by using the three yarns, but neither the coating resin was dropped nor the yarn was broken. A 250 mm test piece was cut out from this rope and a tensile test was performed. Table 1 shows the diameter of the yarn, the volume percentage of glass fiber, the appearance inspection, the filament continuity measurement result, and the rope tensile test result. This yarn was coated with five 50 denier polypropylene filaments and heat-treated at 230 ° C. to obtain a composite yarn. A rope having a diameter of 8 mm was prepared by using 20 of the composite yarns. It has higher strength than the produced rope, and even in the friction test of both ropes, no difference in the initial wear state was observed, and it can be used practically.

Example 2 A low density polyethylene was used as an embedding resin, and a yarn was prepared using the fibers of Example 1 at a processing temperature of 200 ° C.
This yarn was coated with five monofilaments made of 50 denier high-density polyethylene and heat-treated at 240 ° C. to obtain a composite yarn. Then, a rope similar to that of Example-1 was prepared and evaluated. The results are shown in Table 1. However, the specific gravity of polyethylene was 0.96.

Example 3 Using a rubber-modified nylon resin as an embedding resin, a yarn was prepared at a processing temperature of 300 ° C. The yarn was further coated with five 50-denier nylon-6 monofilaments and heat-treated at 250 ° C. to obtain a composite yarn. Then, a rope similar to that of Example-1 was prepared and evaluated. The results are shown in Table 1. However, the specific gravity of the rubber-modified nylon resin was 1.14.

Example 4 A composite yarn and a rope were prepared and evaluated in the same manner as in Example 1 except that 6000 carbon fiber filaments each having a diameter of 5 μm were used in a non-twisted state. The results are shown in Table-1. However, the specific gravity of carbon fiber is 1.81.
And

Example 5 A composite yarn and a rope were prepared and evaluated in the same manner as in Example 1 except that 6000 carbon fiber filaments each having a diameter of 7 μm were bundled and used in an untwisted state. The results are shown in Table-1. However, the specific gravity of carbon fiber is 1.76.
And

Comparative Example-1 A yarn and a rope were prepared in the same manner as in Example 1 except that a maleic anhydride-modified polypropylene composition having an elastic modulus of 220 Kg / mm ² was used, and the appearance and physical properties were examined. The results are shown in Table-2.

Comparative Example-2 A yarn and a rope were prepared in the same manner as in Example 1 except that the glass fiber content was 30% by volume, and the appearance and physical properties of the yarn and the rope were examined. The results are shown in Table-2.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

As described above, according to the present invention, the high-strength fiber which is easily broken can be processed into a rope, a net or the like, and a high-strength rope can be provided.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Chiaki Maruko 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd.

Claims (1)

[Claims] 1. Reinforcing filaments comprising 90% by weight or more of continuous filaments, containing 40% by volume or more of said filaments, and having a modulus of elasticity of 200 kg / mm ^2.
A composite yarn comprising the following thermoplastic resin-embedded yarn covered with a thermoplastic resin filament or tape.