KR101446795B1 - Abs sensor cable - Google Patents

Abstract

The present invention relates to an ABS sensor cable. More particularly, the present invention relates to a semiconductor device comprising an insulated electric wire, an inner sheath coated on the insulated electric wire, and an outer sheath coated on the inner sheath, wherein the inner sheath includes a base resin, an inorganic filler, a stabilizer, Wherein the base resin comprises an ethylene vinyl acetate copolymer having a content of vinyl acetate of 20-30% by weight and an ethylene content of 70-80% by weight, and the inorganic filler is composed of the base resin Wherein the outer sheath is formed from a composition comprising a thermoplastic polyurethane, a stabilizer and a crosslinking aid, wherein the thermoplastic polyurethane has a glass transition temperature of from -29 to -40 DEG C ABS sensor cable.

Description

ABS sensor cable {ABS SENSOR CABLE}

The present invention relates to an ABS (Anti-lock Brake System) sensor cable. More particularly, the present invention relates to an automotive ABS sensor cable.

In automobiles, there is no way to predict how much braking distance is needed if the wheels of an automobile slip due to inertia without rotating by the force of the brake, which can be a situation that can not be controlled by the steering wheel steering. At the same time, it is the ABS system that allows you to control inertia so that at least you can get out of this situation.

The operating principle of such an automobile ABS is that the brake control module senses that the speed of the car and the speed of the specific wheel are moving differently. When the brake control module senses that the brake control module has brake the hydraulic modulator several times per second You are commanded to control the hydraulic pressure. The ABS sensor cable is the cable that transmits signals to the brake control module through these wheel speed sensors.

The conventional ABS sensor cable repeatedly brakes, runs, suddenly brakes, and runs during operation of the vehicle due to the characteristics of the ABS system, and the risk of disconnection due to the stress caused by the bending and vibration of the road surface is very high. In addition, when the brake is operated, it may be exposed to a high temperature environment. That is, shortening the life time of the ABS sensor cable may shorten the life of the function of the braking system of the automobile, decrease the operating effect, and cause malfunction, which may lead to safety of the vehicle and lead to accidents.

Therefore, characteristics such as flexural resistance, heat resistance and water tightness are important for the ABS sensor cable.

In recent years, there has been an increasing demand for ABS sensor cables in accordance with the weight reduction and high functionality of automotive parts. Concretely, there is a tendency to reduce the weight of the automobile itself by reducing the weight of the automobile parts as the weight is reduced, and as the automobile becomes more sophisticated, mounting of the electronic devices increases, thereby reducing the volume of the cable. Further, as the performance of the vehicle becomes higher, the temperature of the brake portion is increased, and high heat resistance is required. In order to prevent the occurrence of disconnection due to the vibration of the vehicle, there is a tendency to have a high bending property, and moisture penetration between the insulator and the sheath A high water-repellency property is required.

In this regard, Korean Patent No. 10-0846996 discloses a thermoplastic elastomer composition and an ABS cable made therefrom.

An object of the present invention is to provide an ABS sensor cable provided with an inner sheath and an outer sheath having good bending resistance and good heat resistance and watertightness.

Another object of the present invention is to provide an ABS sensor cable that is easy to process, has excellent extrusion workability, and has good cold resistance, abrasion resistance, and adhesion.

It is a further object of the present invention to provide an ABS sensor cable capable of meeting the above requirements for weight reduction, thinning, high internal resistance, high flexural strength and high water resistance.

The ABS cable of the present invention includes an insulated electric wire, an inner sheath coated on the insulated electric wire, and an outer sheath coated on the inner sheath, wherein the inner sheath is composed of a base resin, an inorganic filler, Wherein the base resin comprises an ethylene vinyl acetate copolymer having a vinyl acetate content of 20-30% by weight and an ethylene content of 70-80% by weight, , The inorganic filler is contained in an amount of 1 to 10 parts by weight based on 100 parts by weight of the base resin, the outer sheath is formed of a composition comprising a thermoplastic polyurethane, a stabilizer and a crosslinking aid, and the thermoplastic polyurethane has a glass transition temperature Can be -29 to -40 < 0 > C.

The present invention provides an ABS sensor cable having an inner sheath and an outer sheath having good bending resistance and good heat resistance and watertightness. The present invention provides an ABS sensor cable which is easy to process, has excellent extrusion workability, and has good cold resistance, abrasion resistance, and adhesion. Still another object of the present invention is to provide an ABS sensor cable capable of meeting the requirements of weight reduction, thinning, high internal resistance, high flexural strength and high water resistance.

1 is a sectional view of an ABS sensor cable according to an embodiment of the present invention.
2 is a cross-sectional photograph of the ABS sensor cable manufactured in the embodiment.
Fig. 3 is a view for explaining a bending property evaluation method. Fig.
4 is a view for explaining a method of evaluating wear resistance.
5 is a view for explaining a method of evaluating the degree of adhesion.

One embodiment of the ABS sensor cable of the present invention includes an insulated wire, an inner sheath covering the insulated wire, and an outer sheath covering the inner sheath, , An inorganic filler, a stabilizer, a lubricant, and a crosslinking assistant, and the outer sheath is formed of a composition for an outer sheath including a thermoplastic polyurethane, a stabilizer, a crosslinking accelerator, and a crosslinking aid .

(1) Inside Cis  Composition

 (A) Base resin

The base resin may comprise a copolymer of ethylene and a polymerizable monomer with ethylene. For example, the base resin may include at least one of ethylene vinyl acetate (EVA), ethylene butyl acrylate, ethylene methyl acrylate, and ethylene ethyl acrylate. Preferably, it may comprise ethylene vinyl acetate.

Ethylene vinyl acetate is a copolymer of ethylene and vinyl acetate, and may include one or more of homo, random, block copolymers known to those skilled in the art. The ethylene vinyl acetate is superior in heat resistance to the conventional polyurethane during crosslinking, so that the inner sheath melts at a high temperature and may not flow down. In addition, as a polar polymer, it has an excellent adhesion with an insulated wire, a good water tightness, a low price compared to polyurethane, and excellent processability.

In addition, ethylene vinyl acetate is excellent in flexibility compared to conventional polyurethane, and can improve workability and workability when mounted on a vehicle.

The specific gravity of ethylene vinyl acetate may be 0.9-1.0, preferably 0.93-0.95. In this range, the weight of the cable can be reduced by lowering the specific gravity of the conventional thermoplastic polyurethane of 1.12.

The content of vinyl acetate in ethylene vinyl acetate may be 20-30% by weight, and the content of ethylene may be 70-80% by weight. Within the above range, the final manufactured cable may have good wear resistance and good physical properties such as flexibility. Preferably, the content of vinyl acetate is 25-30% by weight, and the content of ethylene is 70-75% by weight.

The Tm (melting temperature) of ethylene vinyl acetate may be less than 85 占 폚, preferably 70-75 占 폚. Within the above range, the final manufactured cable may have good wear resistance and good physical properties such as flexibility.

The Brittleness temperature of ethylene vinyl acetate may be less than -76 占 폚, preferably -76 to -86 占 폚. Within the above range, the final manufactured cable may have good wear resistance and good physical properties such as flexibility.

As the base resin, crosslinked ethylene vinyl acetate (XL-EVA) can be used. XL-EVA refers to the addition of a crosslinking additive to EVA and crosslinking of the EVA with an electron beam to change the EVA, which is a thermoplastic polymer, into a thermosetting polymer (changed into a network polymer) to improve physical properties such as heat resistance, bendability and abrasion resistance. In case of XL-EVA, the tensile strength is more than 150% higher than that of general EVA. When it is left at high temperature, EVA melts near the melting point, but in case of XL-EVA, It is effective.

The base resin may further comprise an olefin-based coupling polymer.

The olefin-based coupling polymer may be an ethylene vinyl acetate resin into which an acid anhydride is introduced, an ethylene-based resin into which an acid anhydride has been introduced (e.g., high density polyethylene, linear low density polyethylene), a polypropylene resin into which an acid anhydride is introduced, A polyolefin elastomer resin, an ethylene terpolymer, or a mixture thereof. Preferably, an ethylene vinyl acetate resin into which an acid anhydride is introduced can be used.

The ethylene vinyl acetate resin into which the acid anhydride has been introduced may include a copolymer resin in which maleic anhydride and / or phthalic anhydride are grafted to the ethylene vinyl acetate resin.

The ethylene-based resin into which the acid anhydride is introduced is a copolymer resin in which maleic acid anhydride and / or phthalic anhydride are grafted to the ethylene-based resin. The ethylene-based resin may preferably be a linear low-density polyethylene or a high-density polyethylene.

The propylene resin into which the acid anhydride is introduced is a copolymer resin in which maleic anhydride and / or phthalic anhydride are grafted to the propylene resin.

The Tm of the olefin-based coupling polymer can be 70-80 占 폚. Within the above range, the adhesion between the resin and the inorganic material can be enhanced and the mechanical properties can be improved. Preferably, it can be 70-72 占 폚.

When both the copolymer and the olefin-based coupling polymer are included as the base resin, the copolymer may be contained in an amount of 80-100 parts by weight and the olefin-based coupling polymer may be contained in an amount of 0-20 parts by weight in 100 parts by weight of the base resin. In the above range, the olefin-based coupling polymer may improve the adhesion between the base resin and the inorganic substance and improve the mechanical properties such as abrasion resistance, bending property and the like. Preferably, 80 to 99.999 parts by weight of ethylene vinyl acetate and 0.001 to 20 parts by weight of olefin-based coupling polymer are contained in 100 parts by weight of the base resin. More preferably, 95 to 99 parts by weight of ethylene vinyl acetate and 1 to 5 parts by weight of olefin-based coupling polymer are contained in 100 parts by weight of the base resin.

(B) Weapons filler

The inorganic filler may be included in the inner sheath composition to increase the strength of the inner sheath and increase the impact resistance.

As the inorganic filler, magnesium hydroxide, aluminum hydroxide, calcium carbonate, calcium hydroxide, talc and the like can be used. Further, the inorganic filler may be surface-treated with vinyl group-containing silane, stearic acid, or the like in order to mix well with the organic components contained in the sheath composition.

The inorganic filler may be, for example, an average particle diameter of 0.5 탆 to 10 탆 and a specific surface area of 5-100 mm ² / g.

The inorganic filler may be contained in an amount of 1-10 parts by weight, preferably 3-6 parts by weight, based on 100 parts by weight of the base resin. Within this range, flexibility and abrasion resistance may be good.

(C) Stabilizer

As the antioxidant, the stabilizer of the present invention may include at least one of commonly known antioxidants such as phenol-based, phosphorus-based, thiol-based, amine-based, and sulfur-based antioxidants and metal deactivators. As a result, it is possible to prevent decomposition in raw material processing and to delay aging of electric wires and / or cables.

Phenolic stabilizers are sterically hindered phenolic stabilizers, for example, alkylated monophenols, polyphenols or alkylation products of dienes and polyphenols, but are not limited thereto.

The phosphorus stabilizer may be a phosphorus ester compound, an aromatic phosphine compound or the like, but is not limited thereto.

As the metal deactivator, conventionally known metal deactivators may be used. For example, 1,2,3-benzotriazole, 3- (N-salicyloyl) amino-1,2,4-triazole, decamethylene dicarboxylic acid disalicyloyl hydrazide, N, N (3,5-di-t-butyl-4-hydroxyphenyl) propionyl] hydrazine, 2,2'-oxamide bis [ethyl 3- Hydroxyphenyl) propionate], bisbenzylidene oxalate hydrazide, isophthalic acid bis (2-phenoxypropionyl hydrazide), 2,4,6-triamino-1,3,5-triazine, ethylenediamine Tetraacetic acid, an alkali metal salt of ethylenediaminetetraacetic acid, a tris [2-t-butyl-4-thio (2'-methyl-4'-hydroxy-5'- Fate, and 3,9-bis [2- (3,5-diamino-2,4,6-triazaphenyl) ethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane But the present invention is not limited thereto.

Preferably, the stabilizer may be a phenol-based antioxidant or a phosphorus-based antioxidant. Specifically, the phenolic antioxidant may be firstly introduced and the phosphorus antioxidant may be introduced secondarily. The phenolic antioxidants included in the first order can inhibit the decomposition in raw material processing, and the secondarily included phosphorus antioxidants can delay the aging of the wires.

The stabilizer may be contained in an amount of 0.1 to 10 parts by weight, preferably 0.1 to 1 part by weight, based on 100 parts by weight of the base resin. Within this range, flexibility and abrasion resistance may be good.

(D) Lubricant

The lubricant can improve the workability by increasing the lubricity when the inner sheath composition is coated on the insulated wire.

The lubricant may be any conventional one known to those skilled in the art. For example, one or more of calcium-based, zinc-based, and amide-based ones.

The lubricant may be contained in an amount of 0.1-1 parts by weight, preferably 0.1-0.9 parts by weight, more preferably 0.1-0.3 parts by weight, based on 100 parts by weight of the base resin. Within this range, flexibility and abrasion resistance may be good.

(E) Crosslinking aid

The crosslinking auxiliary acts on the coating composition crosslinking reaction by the electron beam to promote and assist the crosslinking reaction of the coating composition.

The crosslinking auxiliary may be any known conventional crosslinking auxiliary. For example, there may be mentioned trimethylolpropane trimethacrylate (TMPTMA), triallyl isocyanurate (TAIC), triallyl isocyanurate, triallyl isocyanurate diacrylate, metallic monomethacrylate, Methacrylate, but are not limited thereto.

The crosslinking aid may be contained in an amount of 1-5 parts by weight, preferably 1-1.5 parts by weight, based on 100 parts by weight of the base resin. Within the above range, crosslinking by electron beams can be sufficiently completed, and unreacted crosslinking assistant can prevent the internal system property from being inhibited.

The inner sheath composition may further include a polyolefin and a crosslinking accelerator in addition to the above-described components.

The polyolefin may include one or more of high density polyethylene, low density polyethylene, ultra low density polyethylene, and linear low density polyethylene.

The crosslinking accelerator may include at least one of ZnO and MgO. The crosslinking accelerator may be included in an amount of 3-5 parts by weight based on 100 parts by weight of the base resin.

(2) External Cis  Composition

(A) a thermoplastic polyurethane

Polyurethane is a resin having a urethane bond and can form a matrix of external sheath.

The polyurethane may comprise a network. As a result, it is possible to melt at high temperatures and not flow down, and to increase the flexing resistance and abrasion resistance.

The glass transition temperature of the polyurethane may be less than -28 ° C, preferably -29 to -40 ° C, more preferably -35 to -38 ° C. Within the above range, the cold resistance can be good, and the flexibility of the cable can be secured.

The polyurethane may have a Shore A hardness of less than 95, preferably 85-90, more preferably 85-89. Within the above range, the cold resistance can be good, and the flexibility of the cable can be secured.

The polyurethane may be contained solely in the outer sheath composition, but may be blended with a polyether-series, polyester-series, or polycarbonate-series resin.

The polyurethane may be crosslinked-TPU (XL-TPU). XL-TPU is superior to existing TPU because it has cross-linking agent and additive added to TPU and cross-linking using electron beam, because the structure of XL-TPU molecule is changed into network structure, so heat resistance, abrasion resistance and bendability

(B) Stabilizer

As the antioxidant, the stabilizer of the present invention may include at least one of commonly known antioxidants such as phenol-based, phosphorus-based, thiol-based, amine-based, and sulfur-based antioxidants and metal deactivators. As a result, it is possible to prevent decomposition in raw material processing and to delay aging of electric wires and / or cables.

Phenolic stabilizers are sterically hindered phenolic stabilizers, for example, alkylated monophenols, polyphenols or alkylation products of dienes and polyphenols, but are not limited thereto.

The phosphorus stabilizer may be a phosphorus ester compound, an aromatic phosphine compound or the like, but is not limited thereto.

As the metal deactivator, conventionally known metal deactivators may be used. For example, 1,2,3-benzotriazole, 3- (N-salicyloyl) amino-1,2,4-triazole, decamethylene dicarboxylic acid disalicyloyl hydrazide, N, N (3,5-di-t-butyl-4-hydroxyphenyl) propionyl] hydrazine, 2,2'-oxamide bis [ethyl 3- Hydroxyphenyl) propionate], bisbenzylidene oxalate hydrazide, isophthalic acid bis (2-phenoxypropionyl hydrazide), 2,4,6-triamino-1,3,5-triazine, ethylenediamine Tetraacetic acid, an alkali metal salt of ethylenediaminetetraacetic acid, a tris [2-t-butyl-4-thio (2'-methyl-4'-hydroxy-5'- Fate, and 3,9-bis [2- (3,5-diamino-2,4,6-triazaphenyl) ethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane (Arbitrarily described), but the present invention is not limited thereto.

Preferably, the stabilizer may be a phenol-based antioxidant or a phosphorus-based antioxidant. Specifically, the phenolic antioxidant may be firstly introduced and the phosphorus antioxidant may be introduced secondarily. Phenolic antioxidants can inhibit degradation during raw material processing, and phosphorus antioxidants can delay the aging of wires.

The stabilizer may be contained in an amount of 0.5 to 5 parts by weight, preferably 0.5 to 1.5 parts by weight, based on 100 parts by weight of the polyurethane. Within this range, flexibility and abrasion resistance may be good.

(C) Crosslinking aid

The crosslinking auxiliary acts on the coating composition crosslinking reaction by the electron beam to promote and assist the crosslinking reaction of the coating composition.

The crosslinking auxiliary may be any known conventional crosslinking auxiliary. For example, there may be mentioned trimethylolpropane trimethacrylate (TMPTMA), triallyl isocyanurate (TAIC), triallyl isocyanurate, triallyl isocyanurate diacrylate, metallic monomethacrylate, Methacrylate, but are not limited thereto.

The crosslinking aid may be contained in an amount of 1-5 parts by weight, preferably 1-1.5 parts by weight, based on 100 parts by weight of the thermoplastic polyurethane. Within the above range, the crosslinking by the electron beam is sufficiently completed, and the unreacted crosslinking aid can prevent the physical properties of the remaining coating.

The outer sheath composition may further include, in addition to the above-mentioned components, a crosslinking accelerator and a lubricant.

The crosslinking accelerator may include at least one of ZnO and MgO. The crosslinking accelerator may be contained in an amount of 0 to 5 parts by weight, preferably 1 to 3 parts by weight, based on 100 parts by weight of the polyurethane.

The lubricant may be any conventional one known to those skilled in the art. For example, one or more of calcium-based, zinc-based, and amide-based ones.

The lubricant may be included in an amount of 0.1-0.5 parts by weight based on 100 parts by weight of the polyurethane. Within this range, flexibility and abrasion resistance may be good.

As described above, the ABS sensor cable of the present invention includes an insulated wire, an inner sheath coated on the insulated wire, and an outer sheath coated on the inner sheath, wherein the inner sheath may be formed of the inner sheath composition, The outer sheath may be formed of the outer sheath composition.

1 is a sectional view of an ABS sensor cable according to an embodiment of the present invention.

1, the ABS sensor cable 1 comprises a first unit conductor wire 3 formed by twisting a plurality of strands of individual conductor wires 2 as conductor wires, a first unit conductor wire 3 formed by twisting a plurality of first unit conductor wires 3 2-unit conductor lines 4, as shown in FIG.

The single conductor wire 2 may be a copper tin alloy wire having a copper content of 99.7-99.9 wt% and a tin content of 0.3-0.1 wt%. A plurality of individual conductor lines are included, and generally, 6-9, preferably 7 or so may be included. The diameter of the single conductor wire may be 0.07 mm-0.1 mm.

The second unit conductor line 4 may be covered with an insulator 5 on the outside. The insulator may be an irradiated cross-linked polyethylene insulator. The cross-linked polyethylene insulator can change the structure of the insulator from a linear structure to a network structure as compared with the non-irradiated insulator, thereby maintaining durability at a high temperature for a long time, and improving tensile strength, heat resistance, insulation and chemical resistance.

In addition, the second unit conductor wire 4 may be covered with an insulator including ethylene vinyl acetate or the like.

The insulator includes 100 parts by weight of a base resin containing 70 to 90 parts by weight of ethylene vinyl acetate, 10 to 30 parts by weight of a polyethylene resin, 90 to 110 parts by weight of an inorganic filler, 1-3 parts by weight of an antioxidant as a stabilizer, 3 parts by weight, and 0.1 to 2 parts by weight of a crosslinking auxiliary.

The content of vinyl acetate in the ethylene vinyl acetate may be 20-30% by weight. Within this range, there may be an effect of abrasion resistance, flexural resistance and cold resistance.

The Tm of the ethylene vinyl acetate may be 70 to 75 占 폚. Within this range, the effect may be effective on the bending properties.

The polyolefin may include at least one of high density polyethylene, low density polyethylene, ultra low density polyethylene, and linear low density polyethylene.

The inorganic filler may be magnesium hydroxide, aluminum hydroxide, calcium carbonate, calcium hydroxide, talc, or the like. In addition, the inorganic filler may be surface-treated with vinyl group-containing silane, fatty acid, stearic acid, amine, etc., in order to mix well with the organic components contained in the sheath composition.

The inorganic filler may be, for example, an average particle diameter of 0.5 탆 to 10 탆 and a specific surface area of 5-100 mm ² / g.

The cover bodies 4a and 4b of the second unit conductor wire coated with the cross-linked polyethylene insulator can be twisted to form the inner wire 6, that is, the insulated wire.

The ABS sensor cable of the present invention can be manufactured by sequentially covering the inner sheath 7 and the outer sheath 8 with the inner strand 6.

By covering the inner sheath 7 with the outer sheath 8 in a double manner, the uniformity of the outer appearance of the sensor cable can be ensured. When the sheath is covered with a single sheath, The surface can be prevented from becoming uneven.

The inner sheath and the outer sheath can be produced by coating the insulated wire using the composition for the inner sheath and the composition for the outer sheath. For example, the composition of the inner sheath is mixed using a twin screw extruder, and the shape of the pellet is prepared by water-cooling the strand. Also, the composition for the outer sheath is mixed using a biaxial mixer, and the shape of the pellet is prepared by hot cutting the strand.

Then, pellets for the inner sheath are coated on the insulated wire using a single-screw extruder for wire extrusion.

At this time, the outer diameter may be 3.62-3.65 mm. Then, the outer sheath pellet is coated in the same manner so that the total outer diameter becomes 4.10 to 4.50 mm. And then irradiated using an electron beam accelerator.

In the ABS cable according to the present invention, the outer diameter of the insulated wire is 1.60-1.68 mm, and each insulated wire is twisted so that the outer diameter is 3.28 mm. The thickness of the inner sheath is 0.16-0.19mm, the outer sheath thickness is 0.28-0.33mm, and the outer diameter of the cable is 4.1-4.5mm, which is smaller than the outer diameter of 5.0mm of the conventional ABS sensor cable. .

Hereinafter, the structure and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Specific specifications of the components used in the following examples and comparative examples are as follows

1. Composition for internal sheath

(A) Base resin

(A1) EVA 1: 28% by weight of ethylene vinyl acetate, vinyl acetate, Tm: 75 캜, brittle temperature: <-76 캜

(A2) EVA 2: 19% by weight of ethylene vinyl acetate and vinyl acetate, Tm: 85 占 폚, brittle temperature: <-76 占 폚

(A3) LDPE: low density polyethylene, Tm: 110 DEG C, brittle temperature: <-76 DEG C

(A4) Ethylene Vinyl Acetate Modified with Maleic Acid Ma-g-EVA

(A5) Thermoplastic polyurethane: polyether-based, hardness Shore A 85, glass transition temperature: -38 ° C

  (B) Inorganic filler: vinyl group-containing silane-coated magnesium hydroxide (average particle size: 1 탆)

(C) Primary stabilizer:

(C1) Phenolic antioxidant 1: Irganox 1010, (C2) Phenolic antioxidant 2: Irganox 245

(D) Secondary stabilizer: phosphorus antioxidant: Irganox 168

(E) Lubricant: Amide and calcium series (Streptol TR-016)

(F) Crosslinking aid: TMPTMA (trimethylolpropane trimethacrylate)

2. Composition for external sheath

(A) a thermoplastic polyurethane

(A1) Thermoplastic polyurethane 1: Polyether-based, hardness Shore A 85, glass transition temperature: -38 ° C,

(A2) Thermoplastic polyurethane 2: Polyether-based, hardness Shore A 90, glass transition temperature: -35 ° C,

(A3) thermoplastic polyurethane 3: polyether-based (polyether-based), hardness Shore A 95, glass transition temperature: -28 ° C

(B) Primary stabilizer: Phenolic antioxidant Irganox 245

(C) Secondary stabilizer: sulfur-based antioxidant: Irganox 412 or DSTDP

(D) Crosslinking accelerator: MgO

(E) Crosslinking aid: TMPTMA (trimethylolpropane trimethacrylate)

Examples Comparative Example

(1) Production of inner sheath

The pellets were prepared by mixing the compositional contents (unit: parts by weight, solid basis) according to the following Tables 1 and 2 using a twin screw extruder and water-cooling the strand.

(2) Manufacture of external sheath

The composition of the pellets was prepared by mixing the compositional contents (unit: parts by weight, solid basis) according to the following Tables 1 and 2 using a twin screw extruder and hot cutting the strand Respectively.

(3) Production of insulated wires

80 parts by weight of ethylene vinyl acetate (Tm: 75 ° C, vinyl acetate: 28% by weight), 20 parts by weight of high density polyethylene (Tm: 125 ° C, MI: 2), magnesium hydroxide (silane- , 40 parts by weight of aluminum hydroxide (silane-coated particles, average particle diameter: 1 mu m), 0.5 parts by weight of an antioxidant Irganox 1010, 1.5 parts by weight of Irganox 168, 1.5 parts by weight of MD 1024 and 1.5 parts by weight of TMPTMA The resulting composition was melt-mixed using a twin-screw mixer. The strand was prepared in the form of a pellet by water-cooling cutting. The pellets were extruded and coated to a thickness of 0.46 mm on a conductor having a cross sectional area of 0.25 mm &lt; ² &gt; using tin alloy copper using a wire single screw extruder. The insulated wire was irradiated with 11 Mrad using an electron beam accelerator (1 MeV).

(4) ABS cable manufacturing

Two strands of the insulated wire obtained above were twisted to a pitch of 10 mm or less to form a twisted pair.

The inner sheath material was coated on the outside by using a single screw extruder for wire extrusion so as to have an outer diameter of 3.65 mm. Then, the outer sheath material was coated with an outer diameter of 4.3 mm using a single-screw extruder for wire extrusion. The sample was irradiated at 13 Mrad using an electron beam accelerator (1 MeV) to prepare a test sample. That is, the inner sheath is extruded, and after the cooling, there is a single extruder for extruding the wire, so that the outer sheath is directly coated.

Example Comparative Example Inner sheath One 2 3 One 2 3 4 5 (A1) 100 98 98 - - 98 - 98 (A2) - - - - - - 100 - (A3) - - - 100 - - - - (A4) - 2 2 - - 2 - 2 (A5) - - - - 100 - - - (B) 5 5 5 5 - 20 5 20 (C)
(C1) 0.5 0.5 0.5 0.5 - 2 0.5 2 (C2) - - - - 0.5 - - - (D) - - - - - 3 - 3 (E) 0.2 0.2 0.2 0.2 - 0.5 0.2 0.5 (F) One One One One 1.5 2 One 2 External sheath (A)

(A1) 100 100 - 100 100 100 100 - (A2) - - 100 - - - - 100 (A3) - - - - - - - - (B) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 (C) - - - - - - - - (D) - - - - - - - - (E) 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5

Comparative Example Inner sheath 6 7 8 9 10 11 12 13 14 (A1) - 98 100 98 - 98 - 98 - (A2) 100 - - - 100 - 100 - 100 (A3) - - - - - - - - - (A4) - 2 - 2 - 2 - 2 - (A5) - - - - - - - - - (B) 5 20 5 5 5 20 5 20 5 (C) (C1) 0.5 2 0.5 0.5 0.5 2 0.5 2 0.5 (C2) - - - - - - - - - (D) - 3 - - - 3 - 3 - (E) 0.2 0.5 0.2 0.2 0.2 0.5 0.2 0.5 0.2 (F) One 2 One One One 2 One 2 One External sheath (A) (A1) - - - - - 100 100 100 100 (A2) 100 - - - - - - - - (A3) - 100 100 100 100 - - - - (B) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 (C) - - - - - - - One One (D) - - - - - - 2 2 2 (E) 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5

The following properties of the ABS cable were evaluated and evaluated.

(1) Extrusion workability: Determine the degree of smoothness of the cable surface with the naked eye. In addition, it is judged based on productivity level compared to existing products.

(2) Flexibility (more than 50,000 times to break at 1 kgf load): The ABS sample was mounted as shown in Fig. 3, a load of 1 kgf was applied to the cable sample, and a bending angle of 90 degrees, 30 times / minute The number of times until the conductor of the cable is disconnected while the cable is being reciprocated is measured. The number of left and right 90 ° flexion was evaluated one time.

(3) Resistance to cold (withstand for 1 minute at 1000V after cooling for 3 hours at -45 ℃): After maintaining the ABS cable in a low-temperature bath at -45 ± 2 ℃ for 3 hours, And the surface should be free from cracks and should not exceed 1 minute at 1000V.

(4) Heat Resistance 1 (to stand at 1000V for 1 minute after heating at 136 DEG C for 168 hours): The ABS cable was heated in a constant temperature bath at 136 DEG C for 168 hours, then taken out and left at room temperature. There should be no cracks when the surface of the cable is inspected after winding it three times on its own diameter, and there should be no more than 1 minute at 1000V.

(5) Heat Resistance 2 (to stand at 1000V for 1 minute after heating at 158 DEG C for 168 hours): The ABS cable was heated in a thermostatic chamber at 158 DEG C for 168 hours, and then taken out and left to be at room temperature. There should be no cracks when the surface of the cable is inspected after winding it three times on its own diameter, and there should be no more than 1 minute at 1000V.

(6) Abrasion resistance (should be more than 10 m at 450 gf): 900 mm of ABS cable is fixed as shown in Fig. 4 and a load of 450 gf is applied to 150 G abrasive tape specified in KS L 6002 (abrasive cloth) The length of the tape until the conductor and the tape contact each other was determined.

(7) Adhesion (4kgf or more): Adherence is a substitute for watertightness. The adhesion between the twisted insulated wire and the inner sheath was measured. The higher the degree of adhesion, the more difficult it is to introduce moisture from the outside.

   Prepare 3 test specimens of 10 cm length taken at 1 m intervals from 3 m long cable specimens. Cut the insulator of 25 mm section (between A and B in Fig. 5) from one end of the conductor and peel off both the inner sheath and the outer sheath. The test specimen is then cut at point C so that the length is 75 mm and the 50 mm section (between B and C in Fig. 5) is not affected by the outside. The test fixture of FIG. 5 is used. Use a metal plate with a circle with a diameter similar to that of the conductor. A tensile tester at a speed of 250 mm / min is used. The test apparatus shall be capable of pulling the test sample without causing friction between the apparatus itself and the sample. Pull the test specimen to the test fixture of Fig. Pull the test specimen at a speed of 250 mm / min while avoiding friction between the test apparatus and the conductor. At this time, seek the force. If a flexure occurs in a 50 mm length of insulation during slip, prepare a new test specimen with a length of 25 mm and repeat the same procedure.

(8) Flammability (to be extinguished within 60 seconds after 30 seconds of heating): Hold the specimen of the cable 300 mm horizontally, keep the front end of the flame source from the bottom of the sample to the bottom of the sample within 30 seconds, Remove. The digestion time of the sample should be within 60 seconds.

Example Comparative Example One 2 3 One 2 3 4 5 Extrusion
Workability Good Good Good Good Good Good Good Good Flexibility Pass Pass Pass Fail Pass Fail Pass Fail Cold resistance Pass Pass Pass Fail Pass Pass Pass Pass Heat resistance 1 Pass Pass Pass Pass Pass Pass Pass Pass Heat resistance 2 Pass Pass Pass Fail Fail Pass Pass Pass Abrasion resistance Pass Pass Pass Pass Pass Fail Fail Fail Coherence Pass Pass Pass Fail Fail Pass Pass Pass Flammability Pass Pass Pass Pass Pass Pass Pass Pass

Comparative Example 6 7 8 9 10 11 12 13 14 Extrusion
Workability Good Good Good Good Good Good Good Bad Bad Flexibility Pass Fail Pass Pass Pass Fail Pass - * - Cold resistance Pass Fail Fail Fail Fail Pass Pass - - Heat resistance 1 Pass Pass Pass Pass Pass Pass Pass - - Heat resistance 2 Pass Pass Pass Pass Pass Pass Pass - - Abrasion resistance Fail Fail Pass Pass Fail Fail Fail - - Coherence Pass Pass Pass Pass Pass Pass Pass - - Flammability Pass Pass Pass Pass Pass Pass Pass - -

* "-": Except for the bad appearance at the time of extrusion

    As shown in Tables 3 and 4, the ABS sensor cable of the present invention is excellent in extrusion workability, and has excellent cold resistance, heat resistance, abrasion resistance, adhesion, flexibility and flame retardancy.

On the other hand, in the ABS sensor cable of the present invention, the cable of the comparative example which does not satisfy at least one of the inner sheath and the outer sheath is poor in at least one of extrusion workability, cold resistance, heat resistance, abrasion resistance, The effect of the present invention could not be realized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (17)

An insulated wire, an inner sheath coated on the insulated wire, and an outer sheath coated on the inner sheath,
Wherein the inner sheath is formed of a composition for an inner sheath including 100 parts by weight of a base resin, 1-10 parts by weight of an inorganic filler, 0.1-10 parts by weight of a stabilizer, 0.1-1 parts by weight of a lubricant and 1-5 parts by weight of a crosslinking aid,
Wherein the base resin comprises an ethylene vinyl acetate copolymer having a vinyl acetate content of 20-30% by weight and an ethylene content of 70-80% by weight,
Wherein the inorganic filler comprises at least one of magnesium hydroxide, aluminum hydroxide, calcium carbonate, calcium hydroxide and talc surface-treated with vinyl group-containing silane,
The outer sheath is made of a composition for an outer sheath comprising 100 parts by weight of a thermoplastic polyurethane having a glass transition temperature of -38 to -29 DEG C, 0.5 to 5 parts by weight of a stabilizer, and 1 to 5 parts by weight of a crosslinking aid. .
The ABS sensor cable according to claim 1, wherein the base resin is an ethylene vinyl acetate copolymer.
The ABS sensor cable according to claim 1, wherein the specific gravity of the base resin is 0.9 to 1.0.
delete The ABS sensor cable according to claim 1, wherein the stabilizer in the internal sheath composition comprises a phenolic antioxidant.
The ABS sensor cable according to claim 1, wherein the base resin further comprises an ethylene vinyl acetate copolymer grafted with maleic anhydride or phthalic anhydride.
7. The thermoplastic resin composition according to claim 6, wherein 80 to 99.999 parts by weight of the base resin, 100 to 99.99 parts by weight of the maleic anhydride and / or the maleic anhydride is mixed with 100 parts by weight of the sum of the base resin and the ethylene vinyl acetate copolymer grafted with maleic anhydride and / 0.001-20 parts by weight of an ethylene vinyl acetate copolymer grafted with phthalic anhydride.
delete The ABS sensor cable according to claim 1, wherein the thermoplastic polyurethane has a Shore A hardness of 85-90.
The ABS sensor cable according to claim 1, wherein the thermoplastic polyurethane has a network structure.
The ABS sensor cable according to claim 1, wherein the stabilizer in the composition for external sheath comprises a phenolic antioxidant.
delete The ABS sensor cable according to claim 1, wherein the outer sheath composition further comprises 1-3 parts by weight of a crosslinking accelerator based on 100 parts by weight of the thermoplastic polyurethane.
The ABS sensor cable according to claim 1, wherein the thickness of the inner sheath is 0.16 mm-0.19 mm and the thickness of the outer sheath is 0.28 mm-0.33 mm.
The insulated electric wire according to claim 1, wherein the insulated electric wire includes a first unit conductor wire formed by twisting a plurality of strands of individual conductor wires, a second unit conductor wire formed by collectively extending a plurality of first unit conductor wires and a second unit conductor wire wound around the second unit conductor wire ABS sensor cable with insulation.
16. The method according to claim 15, wherein the insulator comprises 100 parts by weight of a base resin comprising 70-90 parts by weight of ethylene vinyl acetate and 10-30 parts by weight of a polyethylene resin, 90-110 parts by weight of an inorganic filler, 1-3 parts by weight of an antioxidant, 1-3 parts by weight of an inert agent, and 0.1-2 parts by weight of a crosslinking auxiliary.
The ABS sensor cable according to claim 1, wherein the ABS sensor cable has an outer diameter of 4.10 mm to 4.50 mm.

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