KR20100070020A

KR20100070020A - Innoxious thermoplastic resin, method of preparing the same, and method of preparing a cable using the method

Info

Publication number: KR20100070020A
Application number: KR1020080128609A
Authority: KR
Inventors: 박영규
Original assignee: 명성통신 주식회사
Priority date: 2008-12-17
Filing date: 2008-12-17
Publication date: 2010-06-25

Abstract

A thermoplastic resin composition for a non-toxic cable, a method of manufacturing the same, and a method of manufacturing a cable using the same are disclosed. Non-toxic thermoplastic resin is 50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 20 to 30 parts by weight of mineral oil, 5 to 20 parts by weight of polypropylene, 5 to 20 parts by weight of polyethylene, filler 5 to 10 parts by weight and 2 to 5 parts by weight of an additive comprising a pigment and an antioxidant. The cable made of such a non-toxic thermoplastic resin is flexible, excellent in strain recovery, and excellent in workability, which is suitable for earphone cords or cables. In addition, it does not contain harmful components such as chlorine compounds and heavy metal compounds, so it is environmentally friendly and does not cause migration. It also complies with the plastic flame retardancy test standard UL94-HB.

Description

Thermoplastic for non-toxic cable, manufacturing method thereof and method for manufacturing cable using same {INNOXIOUS THERMOPLASTIC RESIN, METHOD OF PREPARING THE SAME, AND METHOD OF PREPARING A CABLE USING THE METHOD}

The present invention relates to a thermoplastic resin, a method for producing the same, and a method for producing a cable using the same. More specifically, the present invention relates to a thermoplastic resin for a non-toxic cable including a non-toxic oil, a method for manufacturing the same, and a method for manufacturing a cable using the same.

In the past, a plastic composition and a stabilizer were mixed and melted in PVC to prepare a resin composition, and a cable was manufactured using the same. In general, plasticizers used in the production of a resin composition containing PVC include phthalate and adipate. The phthalate-based plasticizers include diethyl hexyl phthalate (DEHP), dihexyl phthalate (DHP), dibutyl phthalate (DBP), diisononyl phthalate (DINP) And di-isodecyl phthalate (DIDP). Examples of the adipate-based plasticizer include diethyl hexyl adipate (DHA). The phthalate-based plasticizer is believed to cause disorders or cancer in the endocrine system.

Stabilizers used in the production of resin compositions comprising PVC include barium (Ba) compounds, zinc (Zn) compounds, lead (Pb) compounds, cadmium (Cd) compounds, calcium (Ca) compounds, tin (Sn) compounds Or complex compounds thereof. Since such stabilizers include many heavy metal compounds, there is a risk of inducing heavy metal poisoning when the resin composition containing PVC is in contact with the human body. Heavy metals are absorbed by subcutaneous fat and accumulated in the body without being discharged. They are strongly bound to enzymes related to the central nervous system, causing abnormalities in the nervous system such as mental disorders, nerve palsy, and lethargy. In particular, mercury causes Minamata disease, and cadmium subsequently causes disease.

When the resin composition containing these PVC is used especially for the electric cord of products, such as an earphone or a headphone, since an earphone or a headphone will come into direct contact with a human body, the danger becomes further more. When the cable is in contact with another material, the inside of the cable is soaked by the plasticizer to penetrate or melt the other material. This is so easy that the higher the migration of the resin composition containing PVC.

In addition, since the product using a resin composition containing PVC includes chlorine, it causes dioxin, a carcinogen during combustion, to destroy ecosystems and cause human reproductive function, malformations, growth disorders, and cancer. In order to solve this problem, the applicant has applied for and registered a patent (No. 2004-0015546) for a thermoplastic resin including SEBS and paraffin oil, but recently, paraffin oil contained in the resin is harmful to the human body. There is a need for a non-toxic thermoplastic resin for cables.

A first object of the present invention for solving the above problems is to provide a thermoplastic resin for a non-toxic cable comprising a styrene- ethylene- butylene- styrene copolymer mixed in a non-toxic mineral oil.

A second object of the present invention for solving the above problems is to provide a method for producing a thermoplastic resin for a non-toxic cable.

A third object of the present invention for solving the above problems is to provide a method for manufacturing a cable using the thermoplastic resin for non-toxic cables.

The non-toxic cable thermoplastic resin according to an embodiment of the present invention for achieving the above-described first object is 50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed and melted in mineral oil, mineral oil 20 To 30 parts by weight, 5 to 20 parts by weight of polypropylene, 5 to 20 parts by weight of polyethylene, 5 to 10 parts by weight of a filler, and 2 to 5 parts by weight of an additive including a pigment and an antioxidant.

As an example, filler talc, zeolite, clay, alumina, calcium carbonate and the like can be mentioned. As an example, 0.1 to 0.5 parts by weight of antioxidant and 2 to 4 parts by weight of the pigment may be used as the additive.

According to an embodiment of the present invention for achieving the second object, 50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 20 to 30 parts by weight of mineral oil, polypropylene 5 To 20 parts by weight, 5 to 20 parts by weight of polyethylene, 5 to 10 parts by weight of a filler, and 2 to 5 parts by weight of an additive including a pigment and an antioxidant are mixed to form a resin mixture. Subsequently, the resin mixture is melted and extruded at a temperature range of 150 to 180 ° C. As a result, a thermoplastic resin for a nontoxic cable can be formed.

According to an embodiment of the present invention for achieving the third object, 50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 5 to 20 parts by weight of polypropylene, 5 to 5 parts by polyethylene A resin mixture is formed by mixing 20 parts by weight, 5 to 10 parts by weight of a filler, and 2 to 5 parts by weight of an additive including a pigment and an antioxidant. Subsequently, the resin mixture is melted and extruded at a temperature range of 150 to 180 ° C. to prepare a thermoplastic resin for non-toxic cables. The thermoplastic resin obtained is then melted, coated on a conductor and cooled. As a result, non-toxic earphone cables, cords or wires can be produced.

The non-toxic thermoplastic resin of the present invention described above can produce a wire or cable having good mechanical properties and not causing transition phenomenon. Moreover, the styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil as a main raw material of the thermoplastic resin according to the present invention has excellent heat resistance, aging resistance and weather resistance, and excellent compatibility with other resins. In addition, it has excellent softness and ductility, and does not contain chlorine, so it does not emit dioxins during combustion and does not use heavy metals, so it is not harmful to the human body and the environment. In addition, the non-toxic thermoplastic resin is a UL94-HB grade flame retardant material is suitable for cables and the like of electrical and electronic products that gradually require flame retardancy.

Hereinafter, a thermoplastic resin for a non-toxic cable, a method of manufacturing the same, and a method of manufacturing a cable using the same according to preferred embodiments of the present invention will be described in detail with reference to the embodiments. However, this is not intended to limit the present invention to the form of specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Various components used in the detailed description should not be limited by the terms described. The terms are used only for the purpose of distinguishing one component from another. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "consist of" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, or a combination thereof. Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Thermoplastics for Non-Toxic Cables

Thermoplastic resin for non-toxic cables according to an embodiment of the present invention has a composition comprising a styrene-ethylene-butylene-styrene block copolymer, polypropylene, polyethylene, fillers and additives mixed in mineral oil.

As an example, the thermoplastic resin for a non-toxic cable may include 50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 5 to 20 parts by weight of polypropylene, 5 to 20 parts by weight of polyethylene, and 5 to 5 parts by weight of filler. It may have a composition comprising 10 parts by weight and 2 to 5 parts by weight of an additive comprising a pigment and an antioxidant. As another example, the thermoplastic resin for a non-toxic cable is 5 to 20 parts by weight of polypropylene, 5 to 20 parts by weight of polyethylene, 5 to 10 parts by weight of filler based on 60 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil. It may have a composition comprising 2 parts by weight to 5 parts by weight of an additive including a pigment and an antioxidant.

50 to 70 parts by weight of the styrene-ethylene-butylene-styrene block copolymer mixed with the mineral oil is applied. If the amount of the styrene-ethylene-butylene-styrene block copolymer mixed in the mineral oil is less than 50 parts by weight, the elasticity of the non-toxic thermoplastic resin is lowered. On the other hand, when the amount of the copolymer exceeds 70 parts by weight, there is a problem that the hardness and flexibility of the non-toxic thermoplastic resin is reduced. Accordingly, the thermoplastic resin according to the present embodiment may include styrene-ethylene-butylene-styrene block copolymers mixed in 50 to 70 parts by weight of mineral oil or preferably styrene-ethylene- mixed in 55 to 65 parts by weight of mineral oil. Butylene-styrene block copolymers.

If the amount of the mineral oil applied to the thermoplastic resin for non-toxic cables is less than 20 parts by weight, the hardness and flexibility of the non-toxic thermoplastic resin are lowered and the extrusion characteristics are insufficient at the time of extrusion. On the other hand, when the amount of the mineral oil is more than 30 parts by weight, the elasticity of the non-toxic thermoplastic resin is lowered and the transferability is increased, which may damage or infiltrate other materials. Therefore, 20 to 30 parts by weight of the thermoplastic resin according to the present embodiment includes mineral oils used for, or preferably 22 to 28 parts by weight of mineral oil. For example, white mineral oil or the like may be used as the mineral oil in this embodiment.

If the amount of polypropylene applied to the thermoplastic resin for non-toxic cables is less than 5 parts by weight, the resulting thermoplastic resin becomes too soft and elasticity is reduced. On the other hand, when the amount of polypropylene used exceeds 20 parts by weight, it is not preferable because the hardness is increased and the flexibility is lowered. Therefore, the thermoplastic resin according to the present embodiment includes 5 to 20 parts by weight of polypropylene, and 6 to 15 parts by weight of polypropylene.

Polyethylene applied to the non-toxic cable thermoplastic resin is a milky white translucent thermoplastic resin obtained by polymerizing ethylene (CH = CH). The polyethylene has a low dielectric constant and a low dielectric loss and a high dielectric strength, which is preferable as a wire covering. Moreover, it is excellent in heat resistance and easy to shape | mold, and is compatible with styrene- ethylene- butylene- styrene block copolymer.

As one example, the polyethylene includes low density polyethylene and high density polyethylene. The low density polyethylene (LDPE) is a low density non-linear polymer having many chain branches connected to the main chain, and the high density polyethylene (HDPE) is a high density linear polymer having few branches. The linear polyethylene is stronger than the nonlinear polyethylene, but the nonlinear polyethylene has better price competitiveness and molding degree than the linear polyethylene. Specifically, the polyethylene of the present embodiment may be made of a thermoplastic resin having various physical properties by controlling the mixing ratio of the low density polyethylene (LDPE) and the high density polyethylene (HDPE).

Here, the polyethylene applied to the thermoplastic resin composition of the present invention is preferably used by adjusting the mixing ratio of low density polyethylene and high density polyethylene to a weight ratio of about 2.5 to 3.5: 1. This is because the molding process is better by controlling the strength and hardness of the thermoplastic resin, and the thermoplastic resin composition has suitable physical properties for forming the earphone cable.

When the amount of the polyethylene used is less than 5 parts by weight, the resulting thermoplastic resin composition becomes too soft and the elasticity is low. On the other hand, when the amount of the used polyethylene exceeds 20 parts by weight, the strength of the resulting thermoplastic resin is strong and the strain recovery is lowered. Therefore, the thermoplastic resin according to the present embodiment includes 5 to 20 parts by weight of polyethylene, and 6 to 15 parts by weight of polyethylene.

The filler applied to the non-toxic cable thermoplastic resin can control the physical properties of the thermoplastic resin to be finally formed, lower the price of the product using the thermoplastic resin and improve the extrusion characteristics during extrusion.

If the amount of the filler is less than 5 parts by weight, the influence of changing the physical properties of the compound does not occur, and if the amount of the filler is more than 10 parts by weight, the elasticity and flexibility of the resulting thermoplastic resin composition is reduced, and the surface is rough. However, bleaching may occur. In addition, the properties of the extrusion may be significantly reduced in subsequent extrusion processes for producing the cable. Accordingly, the thermoplastic resin composition according to the present invention includes 5 to 10 parts by weight of the filler, or 6 to 8 parts by weight of the filler. Examples of the filler include talc, zeolite, clay, alumina, calcium carbonate and the like. These can be used individually or in mixture of 2 or more types.

The thermoplastic resin according to the present invention contains 2 to 5 parts by weight of an additive additive including a pigment and an antioxidant. Among the additives, the antioxidant prevents aging of the mixed thermoplastic resin and improves weather resistance, aging resistance, light resistance, and the like.

If the amount of the antioxidant is less than 0.1 part by weight, it is not preferable to use the antioxidant in an amount of 0.5 parts by weight or less, since the oxidation of the thermoplastic resin is not prevented. The thermoplastic resin according to the invention thus comprises 0.1 to 0.5 parts by weight of antioxidant or 0.2 to 0.3 parts by weight.

The antioxidant may be used as a primary antioxidant, a secondary antioxidant or a mixture thereof. As the first antioxidant, Ciba-Gelgy's phenol-based Ultranox 1010 or the like may be used, and as the second antioxidant, General Electric Specialty Chemicals' phosphate-based Ultranox 626 may be used.

Pigments in the additives can be applied to adjust the coloration of the thermoplastic resin and its viscosity. If the use of the pigment is less than 2 parts by weight, the color is soft, and it is not preferable to use the resin for the earphone cable. If the amount of the pigment exceeds 4 parts by weight, the gloss of the cable may be degraded and the pigment may be buried. have. The thermoplastic resin according to the invention thus comprises 2 to 4 parts by weight of pigment or 2 to 3 parts by weight of pigment. The pigment is excellent in heat resistance, weather resistance, chemical resistance and does not contain heavy metal compounds, it is preferable to use those that do not bleed into various solvents. Examples of the pigments include black pigments, white pigments, yellow pigments, red pigments, blue pigments, and the like. In this embodiment, powdery carbon black is used as the black pigment.

In addition, the thermoplastic resin according to the present invention may further include other additives, such as an antistatic agent, an antibacterial agent, a flame retardant, and the like, as necessary.

Non-toxic thermoplastic resin composition having the above-described composition is preferably used for the cable of the earphone or hairphone. It can also be used for ear microphones, portable hands-free earphones, replacement headsets, and microphone cables.

Non-Toxic Thermoplastics and Cable Manufacturing Methods

50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 20 to 30 parts by weight of mineral oil, 5 to 20 parts by weight of polypropylene, 5 to 20 parts by weight of polyethylene, 5 to 10 parts by weight of filler To prepare a resin mixture having a composition of 2 to 5 parts by weight of an additive comprising a pigment and an antioxidant. The description of the mineral oil, styrene-ethylene-butylene-styrene block copolymer, polypropylene, polyethylene, fillers and additives applied to prepare the resin mixture is specifically disclosed in the detailed description of the thermoplastic resin for non-toxic cables. Omit.

Subsequently, the resin mixture is melted in a temperature range of 150 to 180 ° C. In this case, the resin mixture may be melted for about 30 to 50 minutes or for about 40 minutes.

The molten resin mixture is then extruded. As a result, a thermoplastic resin for a nontoxic cable is obtained.

Thereafter, the non-toxic cable thermoplastic resin is melted at a temperature range of 150 ± 20 ° C and coated on a conductor such as a copper wire, and then the conductor coated with the non-toxic thermoplastic resin is cooled to manufacture a cable of an electric wire or an electronic product.

Cables formed of the non-toxic thermoplastic resin for cables according to the present invention have good mechanical properties and reduce migration. It is also harmless to humans and the environment because it does not emit dioxins and does not use heavy metals.

Hereinafter, a thermoplastic resin composition, a method of manufacturing the same, and a method of manufacturing a cable using the same according to the present invention will be described in detail.

Example 1: Preparation of Thermoplastic Resin Composition

65 kg of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 14 kg of white mineral oil, 14 kg of polypropylene, 11 kg of polyethylene (low density polyethylene: high density polyethylene = 3: 1), 7 kg of fine talc SiO2 MgO filler Twin screw extruder after mixing 2.7 kg of black pigment as additive, 0.15 kg of primary antioxidant (Ultranox 1010 from Ciba-Gelgy), and 0.15 kg of secondary antioxidant (phosphate Ultranox 626 from General Electric Specialty Chemicals) (Twin Screw Extruder) was melted for 40 minutes while maintaining a temperature of 170 ℃ ± 10. Subsequently, the thermoplastic resin having the composition shown in Table 1 below was extruded.

Example 2: manufacture of cable

The thermoplastic resin prepared in Example 1 was melted and coated on a conductor of copper wire (0.05-0.08 mm) coated with urethane enamel. At this time, the first screw temperature of the extruder was maintained at 170 ± 3 ℃, the second screw temperature is 160 ± 3 ℃, the head is 150 ± 3 ℃, the die is 150 ± 3 ℃. Cold water of 20 ± 5 ° C. was provided to the copper wire coated with the thermoplastic resin so as to be about 120 m / min. According to the application, the size of the spinning wheel was adjusted and the length of the wire was wound to cut one side to make a cable.

Comparative example

The general PVC resin composition has a content ratio of the materials shown in Table 2 below, and a cord was prepared using the general PVC resin composition having such a content.

Test Example

Property evaluation

The mechanical properties of the cables obtained in Example 2 were measured and shown in Table 3.

Flexural test

A flexure test was performed on the cable obtained in Example 2. Both ends and the negative end of the cable were connected and bent at 90 ° in both directions at room temperature at a rate of 30 times / min to observe whether the breakage appeared. The experimental results are shown in Table 4.

The cable obtained in Example 2 was 11327 times, and was found to be excellent in reliability.

Performance Test

The earphone cable of Example 2 and the earphone cable of Comparative Example were respectively placed between the panel and the panel, and a load of 500 ± 25 g was applied at a temperature of 50 ± 1 ° C. After leaving for 24 hours in this state, the state appearing on the panel was examined. Experimental experiments were conducted on the earphone cables of Example 2 and Comparative Example using three types of acrylonitrile butadiene styrene (ABS) panels, polystyrene (PS) panels, and acrylonitrile styrene (AS) panels. The experimental results are shown in Table 5.

In Table 5, the earphone cable of Example 2 was not implemented for all of the ABS, PS, and AS panels, but the earphone cable of the comparative example occurred in the ABS panel.

Heavy metal content test

The copper wire was removed from the earphone cable of Example 2, and it was confirmed whether heavy metals and harmful substances were detected in the coating. The results are shown in Table 6.

As shown in Table 6, as a result of analysis of harmful substances of the earphone cable made of non-toxic thermoplastic resin, heavy metals such as cadmium, lead, mercury, hexavalent chromium, etc. were not detected. According to the standards of packaging of utensils and containers in the Korean Food Code, synthetic resins made of PVC, polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polychloro vinylidene (PCVD) The content specification of lead and cadmium in the material specification of phenol formaldehyde (PF) is less than 100mg / kg. In addition, cadmium (Cd) and its compounds, poly brominated biphenyls (PBB) and polybrominated diphenyl ethers, chlorinated paraffins (chlorine series) Flame retardants / plasticizers), poly chlorinated biphenyls (PCBs), polychlorinated naphthalenes, organic lead compounds, asbestos, nitrogen compounds and others such as BBP, DBP, DCHP, DEHP, DEHA, DHP, DPP, DPrP Phthalate compounds, halogen compounds, volatile organic compounds, PVC and the like were not detected. Therefore, it can be confirmed that the thermoplastic resin according to the present invention and the earphone cable manufactured therefrom are not harmful to the human body and the environment.

Flame retardant property test

After the specimen having a thickness of 8mm was prepared using the thermoplastic resin of Example 1, the specimen was placed in the horizontal direction. Subsequently, the flame resistance of the specimen was evaluated by igniting the end of the specimen by measuring the combustion length per minute of the specimen. The results are shown in Table 7.

In Table 7, UL-94 HB is a method for evaluating the flame retardancy of plastics widely used in the world, and when the thickness of the specimen is 3.5 to 12.7 mm, the combustion length per minute of the specimen should not exceed 38.1 mm. In the case of the specimen made of the thermoplastic resin of Example 1, as shown in Table 7, it was confirmed that the combustion length per minute has excellent flame retardancy of 20 mm or less on average.

As described above, the present invention can manufacture a flame-retardant wire or earphone cable having good mechanical properties and not causing a transition phenomenon. Furthermore, the thermoplastic resin according to the present invention is harmless because it uses a styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil as a main raw material, and is excellent in heat resistance, aging resistance, flame resistance and weather resistance, and compatible with other resins. Excellent in sex In addition, it is possible to replace the resin composition containing PVC inexpensive and similar to the physical properties of the resin composition containing PVC. In addition, it has excellent softness and ductility, and does not contain chlorine, so no dioxin is emitted during combustion, and no heavy metal is used, so it is not harmful to human body and environment. In addition, the non-toxic thermoplastic resin is a flame retardant material of UL94-HB grade can impart flame retardancy to the cable of electrical and electronic products that are gradually required for flame retardancy.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims

50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil;

20 to 30 parts by weight of mineral oil;

5 to 20 parts by weight of polypropylene;

5 to 20 parts by weight of polyethylene;

5 to 10 parts by weight of the filler; And

A thermoplastic resin for a non-toxic cable having a composition of 2 to 7 parts by weight of an additive including a pigment and an antioxidant.

The thermoplastic resin for a non-toxic cable according to claim 1, wherein white mineral oil is used as the mineral oil.

The thermoplastic resin of claim 1, wherein the polyethylene has a composition in which a low density polyethylene and a high density polyethylene are mixed in a weight ratio of about 2.5 to 3.5: 1.

The thermoplastic resin of claim 1, wherein the filler comprises at least one selected from the group consisting of talc, zeolite, clay, alumina and calcium carbonate.

The thermoplastic resin for a non-toxic cable according to claim 1, wherein 0.1 to 0.5 parts by weight of the antioxidant and 2 to 4 parts by weight of the pigment are used.

The thermoplastic resin for a non-toxic cable according to claim 1, which is applied to manufacture a cord of an earphone cable or a headphone.

50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 20 to 30 parts by weight of mineral oil, 5 to 20 parts by weight of polypropylene, 5 to 20 parts by weight of polyethylene, 5 to 10 parts by weight of filler And 2 to 7 parts by weight of an additive including a pigment and an antioxidant to form a resin mixture;

Melting the resin mixture in a temperature range of 150 to 180 ° C; And

A method of producing a thermoplastic resin for a non-toxic cable comprising the step of extruding the molten resin mixture to obtain a thermoplastic resin for a non-toxic cable.

50 to 70 parts by weight of styrene-ethylene-butylene-styrene block copolymer mixed with mineral oil, 20 to 30 parts by weight of mineral oil, 5 to 20 parts by weight of polypropylene, 5 to 20 parts by weight of polyethylene, 5 to 10 parts by weight of filler Preparing a thermoplastic mixture for a non-toxic cable having a composition comprising 2 parts by weight and 7 parts by weight of an additive including a pigment and an antioxidant;

Melting the thermoplastic resin mixture for the non-toxic cable in a temperature range of 150 to 180 ° C;

Extruding to obtain a thermoplastic resin composition for a non-toxic cable;

Melting the obtained thermoplastic resin composition;

Coating the molten thermoplastic resin composition on a conductor; And

Cooling the conductor coated with the thermoplastic resin composition.