WO2021150042A1 - Insulating composition for vehicle cables, and vehicle cable manufactured using same - Google Patents

Abstract

The present invention relates to: an insulating composition for vehicle cables; and a vehicle cable manufactured by using same. When an insulating layer manufactured from the insulating composition for vehicle cables is included in a vehicle cable, the vehicle cable can achieve an excellent level of abrasion resistance and flame retardancy, which are physical properties that vehicle cables of all standards require in order to meet international standards (ISO 19642), when applied in the form of a thin wire (0.35 SQ to 1.0 SQ). The vehicle cable can be manufactured without any significant changes to the manufacturing process, and thus can reduce manufacturing costs and increase manufacturing efficiency.

Description

Insulation composition for automobile cables and automobile cables manufactured using the same

The present invention relates to an insulating composition for an automobile cable and an automobile cable manufactured using the same.

In general, cables used in transportation means such as railway vehicles, ships, and automobiles require various properties according to their usage environment.

In particular, the physical properties required for automotive cables include oil resistance, heat resistance, cold resistance, and flexibility, and the required properties depend on the characteristics of each part or part of the vehicle, and on the basis of the conductor standard (1.5SQ). to 6.0SQ) or the shape of the thin wire (0.35SQ to 1.0SQ).

In this regard, as a standard required for automotive cables, there is an international automotive wire standard (ISO 6722-1), and research on the T3 class (125℃ class) corresponding to 0.35SQ to 1.5SQ that satisfies this is being actively conducted. Many products have been released because of this, but research on the T4 class (150℃ class) has not been actively conducted so far, and the need for this is required.

Meanwhile, recently, interest in automobile cables that can satisfy the new standard ISO 19642 rather than the existing international standard for automobile cables (ISO 6722-1) is increasing.

In the case of the new standard, ISO 19642, compared to the existing standard, ISO 6722-1, it includes a strict test method and a higher level of physical property requirements.

In order to develop an automobile cable that satisfies these new standards, many attempts were made to satisfy high heat resistance based on this, including the previous T3 class (125℃ class) component, but there was a limit to this.

Patent Document 1 proposes a technology for an automobile cable having a coating composition having high flexibility and high heat resistance.

The technology proposed in Patent Document 1, more specifically, in the manufacture of a battery cable for a vehicle, forms a conductor wire of 19 × 61 annealed wires having a diameter of 0.18 mm to 0.30 mm inside the cable, and is applied to the outside of the conductor wire. The cable is coated with a coating composition composed of 85% by weight of ethylene vinyl acetate (EVA), 10% by weight of high-density polyethylene (HDPE), and 5% by weight of polyolefin (PO). It relates to a battery cable for automobiles, characterized in that it consists of a crosslinking reaction of irradiation through a stan roll.

However, in the case of the technology proposed in Patent Document 1, above all, due to application restrictions that can be applied only to batteries among automobiles, physical properties other than flexibility and heat resistance, that is, wear resistance, long/short-term heat resistance, and low/high temperature impact resistance, etc. The problem that the physical properties could not be satisfied still existed.

Therefore, when used as an automobile cable, it can be applied to any part or part of an automobile by satisfying the required physical properties such as flexibility and heat resistance as well as oil resistance and cold resistance. At the same time, ISO 19642, a new standard according to automobile cables, is satisfied. There is an urgent need for technology development for manufacturing cables for automobiles that can be satisfied.

[Prior art literature]

[Patent Literature]

Patent Document 1: Korean Patent Publication No. 10-0935853

In order to solve the problems of the prior art, the present inventors satisfy the physical properties required according to ISO 19642, a standard of the International Organization for Standardization (ISO), which is necessary when applied to a cable for a vehicle, and at the same time, a more manufacturing process An object of the present invention is to provide an insulation composition for an automobile cable capable of solving the problems of the prior art and an automobile cable manufactured using the same by conducting research on automobile cables that can increase production efficiency by simplifying the research and completing the development.

In order to solve the above-mentioned problems,

The present invention, a base resin comprising a polyethylene-based resin; and an inorganic flame retardant, wherein the polyethylene-based resin provides an insulating composition for an automobile cable comprising a first resin having a melting point of 120°C to 140°C.

In addition, in the present invention, the first resin included in the polyethylene-based resin is a high-density polyethylene (HDPE) resin, a medium-density polyethylene (MDPE) resin, and a linear low-density polyethylene (LLDPE). ) It provides an insulation composition for an automobile cable, characterized in that at least one resin selected from the group consisting of resins.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the base resin further comprises an ethylene copolymer.

In addition, the present invention, the ethylene copolymer is ethylene ethylacrylate (EEA) resin, ethylene butylacrylate (EBA) resin, ethylene methyl acrylate (Ethylene methylacrylate, EMA) resin and ethylene vinyl acetate (Ethylene vinyl acetate, EVA) It provides an insulation composition for an automobile cable, characterized in that it contains one or more resins or copolymers thereof selected from the group consisting of resins.

In addition, the present invention provides an insulating composition for an automobile cable, characterized in that the base resin comprises 40 parts by weight to 70 parts by weight of a polyethylene-based resin and 15 parts by weight to 30 parts by weight of an ethylene copolymer.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the polyethylene-based resin further comprises a second resin having a melting point of 95°C to 115°C.

In addition, the present invention provides an insulating composition for an automobile cable, characterized in that the polyethylene-based resin comprises 40 parts by weight to 60 parts by weight of the first resin and 1 part by weight to 20 parts by weight of the second resin.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the content of the polar monomer contained in the ethylene copolymer is 10% by weight to 20% by weight.

In addition, the present invention provides an insulating composition for an automobile cable, characterized in that the inorganic flame retardant is an inorganic metal hydroxide flame retardant compatible with the base resin.

In addition, the present invention provides an insulating composition for an automobile cable, characterized in that it further comprises a compatibilizer capable of increasing the compatibility of the base resin and the inorganic flame retardant.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the compatibilizer is maleic anhydride grafted polyethylene.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the compatibilizer is included in an amount of 5 to 20 parts by weight based on 100 parts by weight of a mixture of the base resin and the flame retardant.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the inorganic flame retardant is included in an amount of 80 parts by weight to 140 parts by weight based on 100 parts by weight of a mixture of the base resin and the compatibilizer.

In addition, the present invention provides an insulating composition for an automobile cable, characterized in that it further comprises an additive.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the additive is at least one selected from the group consisting of antioxidants, crosslinking aids and lubricants.

In addition, the present invention provides an insulation composition for an automobile cable, characterized in that the additive is included in an amount of 15 to 20 parts by weight based on 100 parts by weight of a mixture of the base resin and the compatibilizer.

In addition, the present invention is a conductor; And it provides an automobile cable comprising an insulating layer made of the above-described insulating composition for automobile cables.

In addition, the present invention provides an automobile cable, characterized in that the conductor has a standard of 0.35SQ to 1.0SQ, and the automobile cable satisfies Equations 1 and 2 below.

[Formula 1]

X ₁ ≥ 150 (unit: times)

X ₂ ≥ 300 (unit: times)

X ₃ ≥ 350 (unit: times)

X ₄ ≥ 400 (unit: times)

[Formula 2]

Y ≤ 30 (unit: seconds)

In Equation 1, X ₁ means the evaluation value of scrape abrasion resistance of the automobile cable measured according to ISO 19642 standard when the size of the conductor is 0.35SQ, and X ₂ is the standard of ISO 19642 when the size of the conductor is 0.5SQ. It means the evaluation value of the scrape abrasion resistance of the automobile cable measured according to, X ₃ means the evaluation value of the scrape abrasion resistance of the automobile cable measured according to the ISO 19642 standard when the size of the conductor is 0.75SQ, and X ₄ is the evaluation value of the scrape abrasion resistance of the conductor When the standard is 1.0SQ, it means the scrape abrasion resistance evaluation value of the automobile cable measured according to the ISO 19642 standard, and in Equation 2, Y means the flame retardance evaluation value of the automobile cable measured according to the ISO 19642 standard.

The insulating composition for automobile cables according to the present invention secures physical properties that can satisfy the international standardization standards (ISO 19642) required for automobile cables when the insulating layer prepared from the insulating composition for automobile cables is included in automobile cables Of course, when the car cable is applied in the form of a thin wire (0.35SQ to 1.0SQ), it is possible to satisfy the abrasion resistance and flame retardancy, which are basic physical properties required for car cables of all standards, at an excellent level.

In addition, the insulation composition for automobile cables according to the present invention is applied in the form of fine wires (0.35SQ to 1.0SQ) of automobile cables of all standards in the previous insulation composition for automobile cables, and is a component to ensure the necessary properties in each specification It was developed with a focus on compatibility and mixing ratio between livers, and since it can be manufactured without major changes to the manufacturing process, production cost and production efficiency can be increased.

The accompanying drawings are intended to explain the contents of the present invention in more detail to those skilled in the art, but the technical spirit of the present invention is not limited thereto.

1 shows an automobile cable according to the present invention.

Hereinafter, the insulation composition for a vehicle cable according to the present invention and a vehicle cable manufactured using the same will be sequentially described in detail, but the scope of the insulation composition for a vehicle cable and the vehicle cable manufactured using the same is limited by the following description it is not

The present invention relates to a composition for cables.

More specifically, the present invention relates to an insulation composition for a cable that can be applied in the form of a thin wire to a transportation means such as an automobile among the composition for a cable (hereinafter referred to as "insulation composition for an automobile cable").

The insulation composition for an automobile cable may include a base resin, and the base resin may include a polyethylene-based resin.

The base resin may include the polyethylene-based resin described above in order to increase abrasion resistance and/or flame retardancy, which are basic properties required for an automobile cable including an insulating layer prepared from the insulating composition for automobile cables according to the present invention.

The polyethylene-based resin may include a first resin having a melting point of 120°C to 140°C.

When the polyethylene-based resin includes the first resin having the melting point range, it is easy to secure physical properties such as abrasion resistance of the cable product manufactured from the insulation composition for automobile cables according to the present invention, and if the melting point of the first resin is When the temperature is less than 120 °C, there is a problem in that it is difficult to secure the required physical properties of wear resistance.

The first resin included in the polyethylene-based resin is a high-density polyethylene (HDPE) resin, a medium-density polyethylene (MDPE) resin, and a linear low-density polyethylene (LLDPE) resin. It may be at least one resin selected from

In the case of the high-density polyethylene resin (HDPE), medium-density polyethylene resin (MDPE) or linear low-density polyethylene resin (LLDPE), it is a chain-shaped polymer compound produced by polymerization of ethylene, and has high crystallinity, so it has rigidity and is strong in impact, It has excellent electrical properties and is widely used in cable compositions.

The polyethylene-based resin may further include a second resin having a melting point of 95°C to 115°C.

In the case of the second resin, if it is a resin having the melting point range, it may be used without particular limitation, but preferably, a low density polyethylene (LDPE) resin may be used.

As described above, the polyethylene-based resin may be included in a mixed resin form in which one or two or more resins are mixed, and when used in a mixed resin form in which two or more resins are mixed, the first resin and the second resin In this case, each melting point of the first resin and the second resin is not particularly problematic as long as it is within the above range, but on the premise that physical properties such as abrasion resistance and flexibility described below are simultaneously satisfied. The upper or lower limit may be changed.

In one example, when the polyethylene-based resin is used in a mixed resin form, the polyethylene-based resin may include 40 parts by weight to 60 parts by weight, 45 parts by weight to 60 parts by weight, or 45 parts by weight to 55 parts by weight; and 1 part by weight to 20 parts by weight, 5 parts by weight to 20 parts by weight, or 5 parts by weight to 15 parts by weight of the second resin.

When the polyethylene-based resin is used in the form of a mixed resin, the polyethylene-based resin preferably includes the first resin and the second resin in the above-mentioned mixing ratio, and when it is out of the mixing ratio, that is, the first resin is 40 weight When less than part or more than 20 parts by weight of the second resin is included, it may be difficult to secure physical properties such as abrasion resistance, and when the first resin is more than 60 parts by weight or the second resin is included less than 1 part by weight, flexibility and cold resistance, etc. There may be problems that may make it difficult to secure the physical properties of

The insulating composition for a vehicle cable according to the present invention may further include an ethylene copolymer in addition to the above-mentioned polyethylene-based resin as a base resin.

In the case of the ethylene copolymer, it may be added to be used in the form of a mixed resin to simultaneously secure filler loading, printability and flame retardancy, including insufficient flexibility of the above-mentioned polyethylene-based resin, and due to the input of the ethylene copolymer It is possible to secure the flexibility and workability required for the insulation composition for an automobile cable according to the present invention.

In one example, the ethylene copolymer is an ethylene ethylacrylate (EEA) resin, an ethylene butylacrylate (EBA) resin, an ethylene methylacrylate (EMA) resin, and an ethylene vinyl acetate resin. At least one resin selected from the group consisting of (Ethylene vinyl acetate, EVA) resin or a copolymer thereof may be included, but preferably ethylene ethyl acrylate or a copolymer thereof.

In the ethylene copolymer, the polar monomer content included in the ethylene copolymer may be 10 wt% to 20 wt% in consideration of the harmonization between physical properties required for the final product, and for preferred use, for example, as the ethylene copolymer When using ethylene ethyl acrylate (EEA), the ethyl acrylate (EA) contained in the ethylene ethyl acrylate (EEA) may be 10 wt% to 20 wt%, and ethyl acrylate (EA) in this range When ethylene ethyl acrylate (EEA) containing ethylene is used, flexibility and processability, which are physical properties to be secured, can be further improved.

Further, the ethylene ethyl acrylate (EEA) used as the ethylene copolymer preferably has a melting point of 90°C to 110°C, preferably around 100°C.

The insulating composition for a vehicle cable according to the present invention is not particularly limited when, as a base resin, an ethylene copolymer in addition to the above-mentioned polyethylene-based resin is included, for example, the base resin may be 40 parts by weight of a polyethylene-based resin to 70 parts by weight, 45 parts by weight to 65 parts by weight, or 50 parts by weight to 60 parts by weight; and 15 parts by weight to 30 parts by weight, 15 parts by weight to 25 parts by weight, or 20 parts by weight to 25 parts by weight of the ethylene copolymer.

If the base resin is out of the mixing ratio of the above range, that is, when less than 40 parts by weight of the polyethylene-based resin or when the ethylene copolymer is more than 30 parts by weight, there may be a problem in not satisfying the required abrasion resistance and heat resistance, In the case of more than 70 parts by weight of the polyethylene-based resin or less than 15 parts by weight of ethylene ethyl acrylate or a copolymer thereof, there may be a problem in not satisfying the required flexibility and workability, so eventually, the insulation composition for an automobile cable according to the present invention Silver may have a problem in that it cannot simultaneously satisfy abrasion resistance, heat resistance, flexibility, and processability.

The insulation composition for a vehicle cable according to the present invention may include a flame retardant in addition to the base resin described above to ensure flame retardancy, and in this case, may include a flame retardant compatible with the base resin.

The flame retardant includes magnesium hydroxide, aluminum hydroxide, a mixture of huntite and hydromagnesite, inorganic flame retardants that are metal hydroxides such as hydromagnesite or magnesium hydroxide, organic phosphorus-based, halogen-based, melamine-based compounds, and organic flame retardants such as nanoclay. , and preferably, an inorganic flame retardant may be used, and more preferably, an inorganic metal hydroxide flame retardant compatible with the base resin may be included in order to secure the unit cost of the cable product and ease of compounding.

In addition, as used herein, the term "compatibility" may mean a property that specific components can be mixed with each other, and more specifically, a specific component in the form of a compatibilizer or without a separate compatibilizer. It may mean including all properties that can be mixed with each other.

In one example, a compatibilizer capable of increasing compatibility between the base resin and the inorganic flame retardant may be additionally included.

The type of the compatibilizer is not particularly limited, but for example, maleic anhydride-grafted polyethylene or maleic anhydride-grafted ethylene vinyl acetate (Maleic Anhydride grafted Ethylene Vinyl) Acetate) can be used, but maleic anhydride-grafted polyethylene is preferable in terms of securing the physical properties of abrasion resistance to a required level.

In one example, when the insulation composition for a vehicle cable according to the present invention additionally includes a compatibilizer capable of increasing the compatibility of the base resin and the inorganic flame retardant, based on 100 parts by weight of a mixture of the base resin and the flame retardant, It may be included in an amount of 5 parts by weight to 20 parts by weight, 10 parts by weight to 20 parts by weight, or 10 parts by weight to 15 parts by weight.

The compatibilizer is preferably included within the above range, and when it is outside the above range, for example, when it is included in less than 5 parts by weight based on 100 parts by weight of a mixture of the base resin and the flame retardant, the base resin and the flame retardant When compatibility between cables is lowered, abrasion resistance and flame retardancy may occur when manufacturing a cable product, and if it contains more than 20 parts by weight, problems may occur in securing flexibility, extrusion processability, and cold resistance when manufacturing cable products.

The inorganic flame retardant may be included in an amount of 80 parts by weight to 140 parts by weight or 90 parts by weight to 140 parts by weight, more preferably 90 parts by weight to 130 parts by weight, based on 100 parts by weight of the mixture of the base resin and the compatibilizer. can

When the inorganic flame retardant is included within the above content range, the insulation composition for automobile cables according to the present invention including the inorganic flame retardant includes the insulation composition for automobile cables, including securing sufficient flame retardancy and long-term/short-term heat resistance It is possible to satisfy physical properties such as abrasion resistance required of the manufactured cable.

The insulation composition for an automobile cable according to the present invention may further include an additive in addition to the above-described components.

The additive is not particularly limited, but may be, for example, at least one selected from the group consisting of antioxidants, crosslinking aids and lubricants.

When the other additives or combinations thereof are included, the content is not particularly limited, but for example, about 15 parts by weight to 20 parts by weight, 15 parts by weight to about 100 parts by weight based on 100 parts by weight of the base resin and compatibilizer mixed. 18 parts by weight or 16 parts by weight to 18 parts by weight may be included.

In addition, if necessary, the insulation composition for an automobile cable according to the present invention may further include other additives in addition to the above-described components.

The other additives include high molecular weight wax, low molecular weight wax, polyolefin wax, paraffin wax, paraffin oil, stearic acid, metal soap, organic silicone, fatty acid ester, fatty acid amide, fatty alcohol, strengthening agent, release agent, UV absorber, stabilizer, pigment , may be at least one selected from the group consisting of dyes, colorants, antistatic agents, foaming agents and metal deactivators.

The invention also relates to a cable.

More specifically, the present invention relates to an automobile cable comprising an insulating layer made of the insulating composition for automobile cables.

As used herein, the term “cable” has the same meaning as the generally used “wire”, and the terms “cable” and “wire” may have the same meaning, and may be used interchangeably.

1 shows an automobile cable according to the present invention.

Referring to FIG. 1 , the vehicle cable 10 according to the present invention includes a conductor 100 ; and an insulating layer 200 made of the above-described insulating composition for automobile cables.

The conductor 100 may have a composite stranded wire structure in which a plurality of metal wires are twisted at a constant pitch, and the metal wire may be made of a single metal or at least two or more metal alloys. That is, the metal element wire may be made of a metal selected from copper, aluminum, iron, nickel, or an alloy of these metals, but is not particularly limited thereto, and is preferably in the form of an annealed wire.

The insulating layer 200 is an insulating layer made of the above-described insulating composition for automobile cables, and the same description as described above will be omitted below.

The diameter of the conductor 100 may be appropriately selected depending on the capacity of the cable including the conductor 100, and the thickness of the insulating layer 200 may be appropriately selected depending on the voltage of the cable including the same.

In one example, in the automobile cable according to the present invention, when the conductor has a standard of 0.35SQ to 1.0SQ, the automobile cable may satisfy Equations 1 and 2 below.

[Formula 1]

X ₁ ≥ 150 (unit: times)

X ₂ ≥ 300 (unit: times)

X ₃ ≥ 350 (unit: times)

X ₄ ≥ 400 (unit: times)

[Formula 2]

Y ≤ 30 (unit: seconds)

In Equation 1, X ₁ means the evaluation value of scrape abrasion resistance of the automobile cable measured according to ISO 19642 standard when the size of the conductor is 0.35SQ, and X ₂ is the standard of ISO 19642 when the size of the conductor is 0.5SQ. It means the evaluation value of the scrape abrasion resistance of the automobile cable measured according to, X ₃ means the evaluation value of the scrape abrasion resistance of the automobile cable measured according to the ISO 19642 standard when the size of the conductor is 0.75SQ, and X ₄ is the evaluation value of the scrape abrasion resistance of the conductor When the standard is 1.0SQ, it means the scrape abrasion resistance evaluation value of the automobile cable measured according to the ISO 19642 standard, and in Equation 2, Y means the flame retardance evaluation value of the automobile cable measured according to the ISO 19642 standard.

The above Equations 1 and 2, scrape abrasion resistance and flame retardancy according to ISO 19642, a new standard among international standardization standards for automobile electric wires, respectively, can be confirmed. When equations 1 and 2 are simultaneously satisfied, the automobile cable is a thin wire (0.35SQ to 1.0SQ) Since scrape abrasion resistance and flame retardancy, which are typical physical properties required as a form, can be secured at the same time, product applicability can be improved.

In particular, in the case of the wear resistance evaluation value required in Equation 1, that is, the "scrape abrasion resistance evaluation value", it is a value that may vary depending on the specification of the conductor, for example, when the specification of the conductor is 0.5SQ, 300 times or more, In the case of 0.75SQ, it can be based on the evaluation value of the scrape wear resistance of more than 350 times and when it is 1.0SQ, more than 400 times of scrape wear resistance. Likewise, since all of the above criteria can be satisfied, product applicability is very good.

Hereinafter, the present invention will be described in more detail through specific experimental examples. However, these experimental examples are for illustrative purposes only and the scope of the present invention is not limited to these experimental examples.

[Production Example]

As shown in [Table 1] below, an automotive cable sample including an insulation layer prepared therefrom was prepared using the insulation composition for vehicle cables for each Example and Comparative Example.

division Example comparative example One 2 3 One 2 3 4 5 6 7 8 Suzy One 50 50 50 50 50 50 50 50 65 35 - 2 - - 10 - 10 - - 30 - - - 3 - - - - - 10 - - - - - 4 25 25 20 25 20 20 25 20 10 40 25 5 - - - - - - - - - 50 compatibilizer One 25 25 20 - 20 20 25 - 25 25 25 2 - - - 25 - - - - - - - flame retardant 120 100 100 100 70 100 150 100 120 120 120 additive 17 17 17 17 17 17 17 17 17 17 17 Resin 1: HDPE resin 2: LDPE resin 3: POE resin 4: EEA (EA content: 15wt%) Resin 5: LLDPE (melting point 112°C) compatibilizer 1: MA-g-LLDPE compatibilizer 2: MA-g-EVA Flame retardant: MDH additive: antioxidant, lubricant and crosslinking aid

More specifically, a compound was prepared by mixing at 150° C. for 30 minutes using a kneader facility (capacity 3L) at the same component and content ratio as in [Table 1], and using the prepared compound, a single screw extruder (Φ: 45) mm) to prepare a wire. When preparing the pilot sample, 0.35SQ (thin wire) wire was applied to the annealed wire, and the prepared sample was subjected to an electron beam crosslinking process, and then the physical properties described below were evaluated.

[Evaluation of physical properties]

1. Scrape abrasion resistance

After preparing a cable sample of each of Examples and Comparative Examples manufactured by extruding using a conductor of 0.35SQ from Preparation Example, scrape abrasion resistance was evaluated based on ISO 19642 standards. In addition, the scrape abrasion resistance was evaluated in the same manner with the conductors being 0.5SQ, 0.75SQ and 1.0SQ.

According to the ISO 19642 standard, 0.35SQ is suitable for automotive wire applications if the wire pressed with a load of 7N rubs against the scrape and does not energize while passing at least 150 times (scrape abrasion resistance evaluation value) reciprocating. In this case, the "evaluation value of scrape abrasion resistance" means the number of reciprocations of scrape when energized in the aforementioned evaluation of scrape wear resistance, and according to the standard of the conductor, 0.5SQ is 300 times or more, 0.75SQ is 350 or more and 1.0SQ are based on the evaluation of scrape abrasion resistance of 400 or more.

2. Heat resistance

After preparing a cable sample of each of Examples and Comparative Examples prepared by extrusion using a conductor of 0.35SQ from the above Preparation Example, heat resistance was evaluated according to ISO 19642 standard.

Here, heat resistance is divided into long-term heat resistance and short-term heat resistance, and long-term heat resistance is to check whether insulation breakdown does not occur while applying a voltage of 1 kV in water for 1 minute after the sample is kept at 150 ° C./3,000 hr, and short-term heat resistance is the sample After staying at 175 ° C./240 hr, it is again retained in a -25 ° C chamber for 4 hours, and then it is checked whether it passes the low temperature bending test.

According to ISO 19642 standard, long-term heat resistance should not cause dielectric breakdown while applying a voltage of 1 kV in water for 1 minute after holding the sample at 150°C/3,000hrs, and short-term heat resistance is -25°C after staying at 175°C/240hrs of the sample. If it passes the low temperature bending test in the chamber, it is suitable for automotive wire applications.

In this evaluation, with respect to short-term heat resistance, the time point at which cracks occurred in excess of 240 hours was additionally confirmed.

3. Low temperature winding

After preparing a cable sample of each of the Examples and Comparative Examples manufactured by extrusion using a conductor of 0.35SQ from the Preparation Example, low-temperature winding (cold resistance) was evaluated based on the ISO 19642 standard.

Here, the low-temperature winding is hung on the sample according to the size of each conductor in an oven at -40°C and the weight specified in the specification is wound after staying in the chamber for 4 hours. It is to check whether insulation breakdown does not occur while applying a voltage of 1 kV among them.

According to the ISO 19642 standard, the low-temperature winding does not generate cracks by hanging the weight specified in the standard according to the size of each conductor in an oven at -40°C and winding it after staying in the chamber for 4 hours, and then 1kV in water for 1 minute. If insulation breakdown does not occur while applying a voltage of

4. Flame retardant

After preparing a cable sample of each of Examples and Comparative Examples manufactured by extrusion using a conductor of 0.35SQ from the Preparation Example, flame retardancy was evaluated according to ISO 19642 standards.

Here, the flame retardancy is, the sample and the burner are fixed at an angle of 45° from the ground, and the sample and the burner are perpendicular to each other, and then the burner flame is applied to the sample for 15 seconds to achieve a combustion length of 550 mm or less within 30 seconds. It is to check whether it is digested.

According to the ISO 19642 standard, fix the sample and the burner at an angle of 45° from the ground, but make sure that the sample and the burner are perpendicular to each other, and then apply the burner flame to the sample for 15 seconds and within 30 seconds (flammability evaluation value). If it is extinguished with a combustion length of 550 mm or less, it is suitable for automotive wire applications. In this case, the "flammability evaluation value" refers to the time that the sample burned in the above-described flame retardancy evaluation is extinguished by itself.

5. Sandpaper wear resistance

After preparing a cable sample of each of Examples and Comparative Examples manufactured by extruding using a conductor of 0.35SQ from the Preparation Example, sandpaper abrasion resistance was evaluated according to ISO 19642 standard.

Here, the sandpaper abrasion resistance is measured using a sandpaper tape with a conductive band of 5 mm to 10 mm perpendicular to the edge of the sandpaper at a maximum interval of 75 mm, and the wire pressed with a load of 0.1 kg rubs against the sandpaper by 250 mm It is to check whether electricity is not applied while passing (sandpaper abrasion resistance evaluation value). In this case, the "sandpaper abrasion resistance evaluation value" refers to a length through which the sandpaper passes while rubbing against the sample.

According to the ISO 19642 standard, measurements are made using a sandpaper tape with a conductive band of 5 mm to 10 mm perpendicular to the edge of the sandpaper at a maximum spacing of 75 mm, and the sample is 250 mm as the wire pressed with a load of 0.1 kg rubs against the sand paper. It is suitable for automotive wire applications if it is not energized while passing through it.

6. High temperature pressure

After preparing a cable sample of each of Examples and Comparative Examples manufactured by extrusion using a conductor of 0.35 SQ from the Preparation Example, high temperature pressure was evaluated according to ISO 19642 standards.

Here, the high temperature pressure is, after applying a load of 0.6N to the sample with a blade-shaped blade in an oven at 150° C. for 4 hours, whether cracks occur and whether a crack occurs after applying a voltage of 1 kV in water for 1 minute. It is to check whether insulation breakdown occurs.

According to ISO 19642 standard, after applying a load of 0.6N to the sample with a blade-shaped blade in an oven at 150°C for 4 hours, cracks do not occur, and thereafter, dielectric breakdown does not occur while applying a voltage of 1kV in water for 1 minute. If not, it is suitable for automotive wire applications.

7. Low temperature shock

After preparing a cable sample of each of Examples and Comparative Examples manufactured by extrusion using a conductor of 0.35SQ from the Preparation Example, low-temperature impact was evaluated based on ISO 19642 standards.

Here, the low-temperature impact was performed by placing the device located on the foam rubber pad together with the sample in a freezer (-15°C) for 4 hours, then dropping the hammer from a height of 100 mm to apply the impact, and whether or not cracks occurred If it does not occur, it is to check whether insulation breakdown occurs while applying a voltage of 1kV in water for 1 minute.

According to the ISO 19642 standard, the device placed on the foam rubber pad is placed in the freezer together with the sample for 4 hours, then the hammer is dropped from a height of 100 mm and impact is applied. If insulation breakdown does not occur while voltage is applied, it is suitable for automotive wire applications.

8. Thermal shock

After preparing a cable sample of each of Examples and Comparative Examples manufactured by extrusion using a conductor of 0.35 SQ from the Preparation Example, thermal shock was evaluated according to ISO 19642 standard.

Here, the thermal shock is performed by winding the sample on a mandrel that is 1.5 times the outer diameter of the sample in an oven at 200° C., and hanging a weight specified in the specification according to the size of each conductor on the sample, staying in the chamber for 6 hours, and winding it to crack It is to check whether or not dielectric breakdown occurs while applying a voltage of 1kV in water for 1 minute after that if cracks do not occur.

According to the ISO 19642 standard, the sample is wound on a mandrel that is 1.5 times the outer diameter of the sample in an oven at 200°C, a weight specified in the specification is hung on the sample according to the size of each conductor, stayed in the chamber for 6 hours, and then wound If cracks do not occur and insulation breakdown does not occur while applying a voltage of 1kV in water for 1 minute, it is suitable for automotive wire applications

[Result of evaluation of physical properties]

The results according to the evaluation of the physical properties for Examples and Comparative Examples are shown in Table 2 below.

division standard Example comparative example One 2 3 One 2 3 4 5 6 7 8 Scrape wear resistance 0.35SQ150 or more 280 295 171 103 168 148 133 111 322 127 137 0.5SQ300 or more 562 584 350 251 362 287 287 252 610 238 248 0.75SQ350 or more 664 670 402 309 428 343 321 318 684 282 298 1.0SQ400 or more 778 791 468 349 479 390 388 353 812 341 364 long-term heat resistance PassorFail Pass Pass Pass Pass Pass Fail Fail Fail Fail Pass Pass short-term heat resistance PassorFail (time of crack occurrence) Pass (24 days) Pass (24 days) Pass (24 days) Pass (24 days) Pass (24 days) Fail (9 days) Fail (18 days) Fail (17 days) Fail (15 days) Pass (24 days) Pass (24 days) low temperature winding CrackorPass Pass Pass Pass Pass Pass Pass crack crack crack Pass Pass flame retardant 30 seconds or less 23 24 25 25 43 26 16 43 22 23 23 Combustion of less than 550mm ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Sandpaper wear resistance 0.35SQ250mm or more 731.25 618.75 356.25 206.25 356.25 206.25 487.5 206.25 768.75 196.25 196.25 high temperature pressure Crack orPass Pass Pass Pass crack Pass crack Pass crack Pass crack crack low temperature shock CrackorPass Pass Pass Pass Pass Pass Pass crack crack crack Pass Pass thermal shock PassorFail Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass

As can be seen in [Table 2], the insulation composition for automobile cables according to the present invention, scrape wear resistance, heat resistance, low temperature winding, flame retardancy, sandpaper abrasion resistance, high temperature pressure, It can satisfy both the criteria of low-temperature shock and thermal shock properties.

The above description of the present application is for illustration, and those of ordinary skill in the art to which the present application pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and likewise components described as distributed may be implemented in a combined form.

The scope of the present application is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present application.

[Explanation of code]

10: car cable

100: conductor

200: insulating layer

Claims (18)

a base resin comprising a polyethylene-based resin; and Including an inorganic flame retardant, The polyethylene-based resin, the melting point of the first resin comprising a 120 ℃ to 140 ℃, an insulation composition for a vehicle cable. The method according to claim 1, wherein the first resin included in the polyethylene-based resin is a high-density polyethylene (HDPE) resin, a medium-density polyethylene (MDPE) resin, and a linear low-density polyethylene (Linear Low Density Polyethylene, LLDPE) Insulation composition for automobile cables, characterized in that at least one resin selected from the group consisting of resins. The insulation composition for an automobile cable according to claim 1, wherein the base resin further comprises an ethylene copolymer. According to claim 3, wherein the ethylene copolymer, ethylene ethylacrylate (EEA) resin, ethylene butylacrylate (EBA) resin, ethylene methyl acrylate (Ethylene methylacrylate, EMA) resin and ethylene vinyl Acetate (Ethylene vinyl acetate, EVA), characterized in that it comprises at least one resin selected from the group consisting of resins or copolymers thereof, an insulating composition for an automobile cable. The insulation composition for an automobile cable according to claim 3, wherein the base resin comprises 40 parts by weight to 70 parts by weight of a polyethylene-based resin and 15 parts by weight to 30 parts by weight of an ethylene copolymer. According to claim 1, wherein the polyethylene-based resin, the melting point of 95 ℃ to 115 ℃ characterized in that it further comprises a second resin, the insulation composition for automobile cables. The insulation composition for an automobile cable according to claim 6, wherein the polyethylene-based resin comprises 40 parts by weight to 60 parts by weight of the first resin and 1 part by weight to 20 parts by weight of the second resin. According to claim 3, The polar monomer content contained in the ethylene copolymer, characterized in that 10% by weight to 20% by weight, the insulation composition for automobile cables. The insulation composition for automobile cables according to claim 1, wherein the inorganic flame retardant is an inorganic metal hydroxide flame retardant compatible with the base resin. The insulation composition for an automobile cable according to claim 9, further comprising a compatibilizer capable of increasing compatibility between the base resin and the inorganic flame retardant. The insulation composition for an automobile cable according to claim 10, wherein the compatibilizer is maleic anhydride-grafted polyethylene. The insulation composition for an automobile cable according to claim 10, wherein the compatibilizer is included in an amount of 5 to 20 parts by weight based on 100 parts by weight of a mixture of the base resin and the flame retardant. The insulation composition for an automobile cable according to claim 10, wherein the inorganic flame retardant is included in an amount of 80 parts by weight to 140 parts by weight based on 100 parts by weight of a mixture of the base resin and the compatibilizer. The insulation composition for an automobile cable according to claim 10, further comprising an additive. The insulation composition for automobile cables according to claim 14, wherein the additive is at least one selected from the group consisting of antioxidants, crosslinking aids and lubricants. The insulation composition for an automobile cable according to claim 14, wherein the additive is included in an amount of 15 to 20 parts by weight based on 100 parts by weight of a mixture of the base resin and the compatibilizer. conductor; and An automobile cable comprising an insulating layer made of the insulating composition for automobile cables according to any one of claims 1 to 16. The vehicle cable according to claim 17, wherein the conductor has a standard of 0.35SQ to 1.0SQ, and the vehicle cable satisfies Equations 1 and 2 below: [Formula 1] X ₁ ≥ 150 (unit: times) X ₂ ≥ 300 (unit: times) X ₃ ≥ 350 (unit: times) X ₄ ≥ 400 (unit: times) [Formula 2] Y ≤ 30 (unit: seconds) In Equation 1, X ₁ means the evaluation value of scrape abrasion resistance of the automobile cable measured according to ISO 19642 standard when the size of the conductor is 0.35SQ, and X ₂ is the standard of ISO 19642 when the size of the conductor is 0.5SQ. It means the evaluation value of the scrape abrasion resistance of the automobile cable measured according to, X ₃ means the evaluation value of the scrape abrasion resistance of the automobile cable measured according to the ISO 19642 standard when the size of the conductor is 0.75SQ, and X ₄ is the evaluation value of the scrape abrasion resistance of the conductor When the standard is 1.0SQ, it means the scrape abrasion resistance evaluation value of the automobile cable measured according to the ISO 19642 standard, and in Equation 2, Y means the flame retardance evaluation value of the automobile cable measured according to the ISO 19642 standard.

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