Resin composition and electric wire / cable

Abstract

To provide a non-halogen-based resin composition which can improve workability (for example, reduction in weight, peeling property, and wire passing property) while exhibiting flame retardancy, and an electric wire / cable using the resin composition.SOLUTION: A resin composition contains: a base resin containing 35-75 mass% of a non-polar olefinic resin and 25-65 mass% of an olefinic resin having polarity; a silicone compound in which a molecular weight of 0.5-3.0 pts.mass is 1,000-100,000 with respect to 100 pts.mass of the base resin; a silicone compound in which a molecular weight of 0.5-3.5 pts.mass is 300,000-600,000; a flame retardant of 15-55 pts.mass; and an antioxidant of 0.1-0.7 pts.mass.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a resin composition and an electric wire / cable, and more particularly to a halogen-free resin composition and an electric wire / cable having a coating layer containing the resin composition. [Background technology]

[0002] In recent years, interest in environmental issues has grown worldwide, and wires and cables that use halogen-free compositions that do not generate harmful halogen gases when incinerated are becoming more common. Various proposals have also been made for wires and cables that use halogen-free compositions.

[0003] Non-halogen compositions used in electric wires and cables include resin compositions made from polyolefin resins. Polyolefin resins can be incinerated because they do not produce halogen gases when burned, but because they have poor flame resistance, flame retardants are added when used to make resin compositions for covering electric wires or cables.

[0004] For example, Patent Document 1 describes a method for manufacturing a flame retardant containing a water-containing inorganic compound in an amount of 5 parts by weight or more and less than 50 parts by weight per 100 parts by weight of a polyolefin resin, and a flame retardant having a density of 1.5 g / cm 3 and a non-halogen flame-retardant resin composition having a specific gravity of 1.14 or less, an oxygen index of 24 or more, and a heavy metal content of less than 0.1 wt %, which is obtained by mixing 1 part by weight to 55 parts by weight of a flame-retardant auxiliary agent having one or both of the functions of forming a shell-like insulating layer upon combustion and foaming at high temperatures to trap water vapor, and which is at least one selected from the group consisting of a gummy silicone oil having a molecular weight of 300,000 to 1,000,000, a silicone powder, and a silicone-modified polymer. Cited Document 1 lists magnesium hydroxide and aluminum hydroxide as examples of hydrous inorganic compounds. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3193017 Summary of the Invention [Problem to be solved by the invention]

[0006] Metal hydroxides such as magnesium hydroxide and aluminum hydroxide used as flame retardants increase the friction resistance of the composition, so wires and cables coated with conventional halogen-free compositions tend to lack lubricity and have poor workability.

[0007] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a halogen-free resin composition that can improve workability (e.g., weight reduction, peelability, and wire-running ability) while exhibiting flame retardancy, and an electric wire / cable using the resin composition. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the resin composition according to the present invention has the following characteristics. A resin composition characterized by containing a base resin containing 35 to 75 mass% of a non-polar olefin-based resin and 25 to 65 mass% of a polar olefin-based resin, and, relative to 100 parts by mass of the base resin, 0.5 to 3.0 parts by mass of a silicone compound having a molecular weight of 1,000 to 100,000, 0.5 to 3.5 parts by mass of a silicone compound having a molecular weight of 300,000 to 600,000, 15 to 55 parts by mass of a flame retardant, and 0.1 to 0.7 parts by mass of an antioxidant.

[0009] In order to achieve the above-mentioned object, the electric wire / cable according to the present invention has the following features. An electric wire / cable comprising a conductor and at least one covering layer formed on the outside of the conductor, the covering layer including a layer formed from the resin composition. [Effects of the Invention]

[0010] The resin composition of the present invention exhibits flame retardancy, prevents the bleeding of silicone and antioxidants, and ensures slipperiness. Therefore, electric wires and cables having the resin composition of the present invention as a coating layer can be easily installed and reduce the burden on installers.

[0011] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic cross-sectional view of an electric wire according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view of a cable according to one embodiment of the present invention. [Figure 3] FIG. 3 is a schematic cross-sectional view of a cable according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the resin composition and the electric wire / cable according to the present invention will be described.

[0014] The resin composition of the present invention contains a base resin containing an olefin-based resin, a flame retardant, and an antioxidant, and further contains a silicone compound having a molecular weight of 1,000 to 100,000 as a lubricant and a silicone compound having a molecular weight of 300,000 to 600,000 as a flame retardant aid.

[0015] The base resin contains 35 to 75 mass % of a non-polar olefin resin and 25 to 65 mass % of a polar olefin resin. Non-polar olefin resins are those that do not contain oxygen, nitrogen, sulfur, or halogens in their molecules and that exhibit little or no electronic polarization within the molecule. Polar olefin resins are those that contain polar functional groups (e.g., hydroxyl, carboxyl, or amino groups). In the present invention, the cable characteristics can be optimized by using a non-polar olefin resin and a polar olefin resin in combination as the olefin resin.

[0016] Examples of non-polar olefin-based resins include polyethylenes (PE), such as high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (L-LDPE), and very-low-density polyethylene (V-LDPE), as well as polypropylene (PP), ethylene-propylene copolymers (EPR), polyisoprene (PI), polybutene (PB), polyisobutylene (PIB), and polybutadiene (BR). Examples of polar olefin-based resins include ethylene-ethyl acrylate copolymers (EEA), ethylene-vinyl acetate copolymers (EVA), ethylene-methyl acrylate copolymers (EMA), and ethylene-butyl acrylate copolymers (EBA). The non-polar olefin-based resins and polar olefin-based resins may each be used alone or in combination of two or more. Among these, the non-polar olefin-based resin is preferably at least one selected from the group consisting of polyethylene, polypropylene, and ethylene-propylene copolymer, and the polar olefin-based resin preferably includes at least one selected from the group consisting of ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, and ethylene-methyl acrylate copolymer.

[0017] The non-polar olefin resin and the polar olefin resin each have a density of 0.900 to 0.970 g / cm 3 It is preferable that the density is 0.910 to 0.960 g / cm 3is more preferable. By using an olefin resin having a density within the above range, it is possible to further improve mechanical properties. Furthermore, the olefin resin preferably has a melt viscosity (MFR) of 0.3 to 5.0 g / 10 min, more preferably 0.3 to 3.0 g / 10 min. When the melting temperature of the olefin resin is within the above range, extrusion processability is improved.

[0018] The density referred to in the present invention is a value measured in accordance with JIS K7112 (1999), and the MFR is a value measured in accordance with JIS K7210 (2014) at 190°C and a load of 2.16 kgf.

[0019] The non-polar olefin resin is contained in the base resin at 35 to 75% by mass. If the content of the non-polar olefin resin in the base resin is 35% by mass or more, it becomes easier to ensure the slipperiness of the electric wire or cable, and if it is 75% by mass or less, it is possible to add a sufficient amount of flame retardant. The non-polar olefin resin is preferably contained in the base resin at 40 to 70% by mass.

[0020] The polar olefin resin is contained in the base resin in an amount of 25 to 65% by mass. If the content of the polar olefin resin in the base resin is 25% by mass or more, bleed-out of silicone and antioxidants can be suppressed, but if the content of the polar olefin resin is too high, costs may increase. The polar olefin resin is preferably contained in the base resin in an amount of 30 to 60% by mass.

[0021] The base resin may contain other resins, such as rubber components, as long as the effects of the present invention are not impaired.

[0022] Examples of rubber components include ethylene-propylene-non-conjugated diene copolymer rubber (EPDM) and styrene-ethylene-butylene-styrene copolymer (SEBS).

[0023] The flame retardant can be appropriately selected from flame retardants that can be used in electric wires and cables, and examples thereof include inorganic flame retardants such as metal hydroxides such as magnesium hydroxide, aluminum hydroxide, calcium hydroxide, basic magnesium carbonate, and hydrotalcites; phosphate flame retardants such as aromatic condensed phosphate esters, ammonium polyphosphate, and melamine phosphate; and intumescent flame retardants such as ammonium polyphosphate, melamine polyphosphate, piperazine polyphosphate, ammonium pyrophosphate, melamine pyrophosphate, and piperazine pyrophosphate. These may be used alone or in combination of two or more. Among these, it is preferable to use metal hydroxides, and magnesium hydroxide, aluminum hydroxide, and calcium hydroxide are more preferable, from the viewpoints of cost and availability, as they are more likely to provide the effects of the present invention.

[0024] The content of the flame retardant is 15 to 55 parts by mass per 100 parts by mass of the base resin. When the content of the flame retardant is 15 parts by mass or more per 100 parts by mass of the base resin, the resin composition can have sufficient flame retardancy. If the content of the flame retardant is too high, the density of the resin composition will be 1.14 g / cm. 3 This makes it difficult to separate the density from polyvinyl chloride (PVC) during waste disposal, but by containing 55 parts by mass or less, the density of the resin composition can be reduced to 1.14 g / cm 3 It's easy to adjust the following: The flame retardant is preferably contained in an amount of 20 to 50 parts by mass relative to 100 parts by mass of the base resin.

[0025] Examples of the antioxidant include non-halogen antioxidants such as phenol-based antioxidants, amine-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, etc. Examples of the phenol-based antioxidant include dibutylhydroxytoluene (BHT), pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-t-butyl-4-hydroxybenzyl)-S-triazine-2,4,6-(1H,3H,5H)trione, and thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. Examples of the amine antioxidants include 6-ethoxy-1,2-dihydro-2,2,4-trimethylquinoline, phenyl-1-naphthylene, alkylated diphenylamine, octylated diphenylamine, 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, p-(p-toluenesulfonylamido)diphenylamine, N,N'-di-2-naphthyl-p-phenyldiamine, N,N'-diphenyl-p-phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, and N-phenyl-N'-isopropyl-p-phenylenediamine. Examples of the phosphorus-based antioxidant include triisodecyl phosphite, diphenylisodecyl phosphite, triphenyl ...Examples of sulfur-based antioxidants include didodecyl 3,3'-thiodipropionate, ditridecyl 3,3'-thiodipropionate, dioctadecyl 3,3'-thiodipropionate, tetrakis[methylene-3-(dodecylthio)propionate]methane, etc. These may be used alone or in combination of two or more. Among these, from the viewpoint of easily obtaining an excellent antioxidant effect, phenol-based antioxidants, amine-based antioxidants, and phosphorus-based antioxidants are preferred, and phenol-based antioxidants are more preferred.

[0026] The content of the antioxidant is 0.1 to 0.7 parts by mass per 100 parts by mass of the base resin. If the content of the antioxidant is 0.1 part by mass or more per 100 parts by mass of the base resin, heat resistance can be maintained for a long period of time, but if the content of the antioxidant is too high, there is a risk of bleed-out, so the content is 0.7 parts by mass or less. The antioxidant is preferably contained in an amount ranging from 0.2 to 0.7 parts by mass relative to 100 parts by mass of the base resin.

[0027] The resin composition of the present invention contains a silicone compound having a molecular weight of 1,000 to 100,000 as a lubricant. The silicone compound having a molecular weight of 1,000 to 100,000 refers to a composition that mainly contains an aggregate of silicone polymers having a molecular weight in the range of 1,000 to 100,000. By including a silicone compound having a molecular weight of 1,000 to 100,000 in the resin composition, the lubricity can be improved, thereby improving the workability of the electric wire.

[0028] As the silicone compound having a molecular weight of 1,000 to 100,000, commercially available products can be used, such as "KF-96-350cs" (trade name) manufactured by Shin-Etsu Chemical Co., Ltd., and "SH200 Fluid 1,000cSt" and "SH200 Fluid 3,000cSt" (both trade names) manufactured by DuPont-Toray Specialty Materials Co., Ltd. One type of silicone compound having a molecular weight of 1,000 to 100,000 may be used alone, or two or more types may be used in combination.

[0029] The content of the silicone compound having a molecular weight of 1,000 to 100,000 is 0.5 to 3.0 parts by mass per 100 parts by mass of the base resin. When the content of the silicone compound having a molecular weight of 1,000 to 100,000 is 0.5 parts by mass or more per 100 parts by mass of the base resin, the lubricity of the resin composition is improved, making it easier to install electric wires or cables coated with the resin composition. If the content of the silicone compound having a molecular weight of 1,000 to 100,000 is too high, there is a risk of bleed-out, so the content is 3.0 parts by mass or less. The silicone compound having a molecular weight of 1,000 to 100,000 is preferably contained in an amount of 0.5 to 2.5 parts by mass per 100 parts by mass of the base resin.

[0030] The resin composition of the present invention may contain a lubricant other than a silicone compound having a molecular weight of 1,000 to 100,000, provided that the effects of the present invention are not impaired. Examples of other lubricants include hydrocarbon-based lubricants such as low-molecular-weight waxes, paraffin waxes, and polyethylene waxes; fatty acid-based lubricants such as higher fatty acids such as lauric acid, stearic acid, and behenic acid, or hydroxy fatty acids such as hydroxystearic acid; ester-based lubricants such as lower alcohol esters of fatty acids, polyhydric alcohol esters of fatty acids such as glycerides, polyglycol esters of fatty acids, and fatty alcohol esters of fatty acids (ester waxes); and natural wax-based lubricants such as carnauba wax and candy wax.

[0031] The resin composition of the present invention also contains a silicone compound having a molecular weight of 300,000 to 600,000 as a flame retardant aid. The silicone compound having a molecular weight of 300,000 to 600,000 refers to a composition that mainly contains an aggregate of silicone polymers having a molecular weight in the range of 300,000 to 600,000. By including a silicone compound having a molecular weight of 300,000 to 600,000 in the resin composition, the flame retardancy of the resin composition can be improved, and the content of the flame retardant can be reduced, thereby lowering the density of the resin composition (1.14 g / cm). 3 (See below) for easier adjustment.

[0032] As the silicone compound having a molecular weight of 300,000 to 600,000, commercially available products can be used, such as "DC4-7081" (trade name) manufactured by DuPont Toray Specialty Materials Co., Ltd. One type of silicone compound having a molecular weight of 300,000 to 600,000 can be used alone, or two or more types can be used in combination.

[0033] The content of the silicone compound having a molecular weight of 300,000 to 600,000 is 0.5 to 3.5 parts by mass per 100 parts by mass of the base resin. When the content of the silicone compound having a molecular weight of 300,000 to 600,000 is 0.5 parts by mass or more per 100 parts by mass of the base resin, the flame retardancy of the resin composition can be improved. If the content of the silicone compound having a molecular weight of 300,000 to 600,000 is too high, there is a risk of bleed-out, so the content is 3.5 parts by mass or less. The silicone compound having a molecular weight of 300,000 to 600,000 is preferably contained in an amount of 1.0 to 3.0 parts by mass per 100 parts by mass of the base resin.

[0034] The resin composition of the present invention may contain a flame retardant aid other than the silicone compound having a molecular weight of 300,000 to 600,000, as long as the effect of the present invention is not impaired.

[0035] In addition to the flame retardant, antioxidant, lubricant, and flame retardant aid described above, various known additives such as fillers, processing aids, ultraviolet absorbers, pigments, antistatic agents, and dispersants may also be blended into the resin composition of the present invention, as needed.

[0036] Examples of fillers include light calcium carbonate, heavy calcium carbonate, mica, bentonite, zeolite, hydrated lime, kaolin, and diatomaceous earth.

[0037] Examples of processing aids include petroleum oils such as paraffinic oils, aromatic oils, and naphthenic oils.

[0038] Examples of ultraviolet absorbers include benzophenone compounds, benzotriazole compounds, salicylate compounds, substituted tolyl compounds, and metal chelate compounds.

[0039] As the pigment, general inorganic pigments and organic pigments listed in the "Pigment Handbook (compiled by the Japan Pigment Technology Association)" can be used. Examples of inorganic pigments include titanium-containing (composite) metal oxides such as titanium yellow, zinc oxide, iron oxide, zinc sulfide, and antimony trioxide. Examples of organic pigments include phthalocyanine-based, anthraquinone-based, quinacridone-based, azo-based, isoindolinone-based, quinophthalone-based, perinone-based, and perylene-based pigments.

[0040] Examples of antistatic agents include alkyl phosphate esters and silicate compounds.

[0041] Examples of dispersants include acrylic dispersants, fatty acid ester dispersants, polyethylene glycol dispersants, nonionic surfactants, amphiphilic triphenylene derivatives, and pyrene derivatives.

[0042] The resin composition of the present invention can be obtained by mixing the various components described above, and by extruding the resin composition using an extruder or the like, a coating layer made of the resin composition of the present invention can be formed on the outside of a conductor.

[0043] The resin composition of the present invention has a density of 1.14 g / cm 3 The resin composition of the present invention is a non-halogen-based resin composition and can be disposed of by incineration, but in this case it is necessary to separate it from materials that generate halogen gas, such as polyvinyl chloride (PVC). This separation is generally performed using the density of the materials, and when the density of the resin composition of the present invention is 1.14 g / cm 3 If the density is equal to or less than this, it becomes easy to separate the polyvinyl chloride from the polyethylene terephthalate in terms of density during waste disposal. The lower limit of the density is not particularly limited.

[0044] The density of the resin composition is determined by measuring the density of a molded article formed using an extrusion molding machine or the like in accordance with JIS K7112 5.1 Method A (underwater displacement method).

[0045] The flame retardancy of the resin composition of the present invention is preferably such that the flame is extinguished within 60 seconds based on a combustion test in accordance with JIS C3005 (4.26). Furthermore, the slipperiness is preferably such that the static friction coefficient is 0.60 or less (in accordance with ASTM D1894). By satisfying these flame retardancy and slipperiness properties, even when used as an insulator or sheath for electric wires and cables, workability can be improved while maintaining flame resistance.

[0046] Next, electric wires and cables using the resin composition of the present invention will be described. By using the resin composition of the present invention as a covering material for a conductor such as an insulator or a sheath, electric wires and cables having excellent flame retardancy and slip properties can be obtained.

[0047] The electric wire / cable of the present invention has a conductor and at least one covering layer formed on the outside of the conductor, and this covering layer includes a layer formed from the resin composition of the present invention.

[0048] FIG. 1 is a schematic cross-sectional view of an electric wire (insulated electric wire) according to an embodiment of the present invention, and FIGS. 2 and 3 are schematic cross-sectional views of cables (insulated cables) according to an embodiment of the present invention. As shown in Fig. 1, an electric wire 1 in this embodiment includes a conductor 10 and an insulator 11 as a coating layer 5 that covers the periphery of the conductor 10. Also, as shown in Fig. 2, a cable 2 in this embodiment includes a plurality of bundled electric wires 1 (1a, 1b, 1c) and a sheath 21 as a coating layer 5 that covers the periphery of the bundled electric wires 1. Note that the cable 2 does not necessarily need to bundle a plurality of electric wires 1, and as shown in Fig. 3, the periphery of the conductor 10 may be covered with a coating layer 5 made of an insulator 11 and a sheath 21.

[0049] The conductor 10 may be a single wire or a bundle of multiple wires. The material of the conductor 10 may be, for example, a conductive metal such as copper, plated copper, copper alloy, aluminum, or aluminum alloy.

[0050] In the present invention, the coating layer 5 consists of at least one layer, and at least one of the layers constituting the coating layer 5 is formed from the resin composition of the present invention. In the present invention, it is preferable that at least the outermost layer of the coating layer 5 is formed from the resin composition of the present invention. That is, in FIG. 1, the insulator 11 is formed from the resin composition of the present invention, and in FIGS. 2 and 3, at least the sheath 21 is formed from the resin composition of the present invention. Note that the insulator 11 in FIGS. 2 and 3 may also be formed from the resin composition of the present invention. Forming at least the outermost layer from the resin composition of the present invention improves the slipperiness of the electric wire or cable, thereby improving workability.

[0051] In the electric wire 1 and the cable 2 of the present invention, the density of the insulator 11 and the sheath 21 formed from the resin composition of the present invention is 1.14 g / cm 3 Preferably, the density is equal to or less than 1000 MPa. Such a density can reduce the weight of the electric wire 1 or cable 2, thereby improving transportation costs and ease of handling. The density can be adjusted by the type of base polymer, the type and number of flame retardants and other compounds.

[0052] In the electric wire 1 and cable 2 of the present invention, the thickness of the insulator formed from the resin composition of the present invention is preferably 0.70 to 1.5 mm from the viewpoint of insulating properties, and the thickness of the sheath formed from the resin composition of the present invention is preferably 1.3 to 2.2 mm from the viewpoint of functioning as a protective layer.

[0053] The electric wires and cables can be produced by known methods, for example, by a general extrusion molding method. For example, the electric wire 1 is obtained by extruding the resin composition of the present invention onto a wire such as copper constituting the conductor 10 using an extruder such as a single-screw extruder or a twin-screw extruder to form the insulator 11. The cable 2 is obtained by bundling one or more electric wires 1 thus obtained and extruding the resin composition of the present invention onto the outside of the wires to form the sheath 21. [Example]

[0054] The present invention will be further described below with reference to examples, but the present invention is not limited to the following examples.

[0055] The components used in the examples and comparative examples are as follows. Non-polar polyolefin resin: Polyethylene (PE), "NUCG-9301" manufactured by ENEOS NUC Corporation (product name, density 0.920 g / cm 3 , MFR 0.7g / 10min) Polar polyolefin resin: Ethylene-ethyl acrylate copolymer (EEA), "NUC-6520" manufactured by ENEOS NUC Corporation (product name, density 0.94 g / cm 3 , MFR 1.6g / 10min) Lubricant: Silicone compound with a molecular weight of 1,000 to 100,000, "KF-96-350cs" (product name, dimethyl silicone, viscosity 350 cPs) manufactured by Shin-Etsu Chemical Co., Ltd. Flame retardant additive: Silicone compound with a molecular weight of 300,000 to 600,000, manufactured by DuPont Toray Specialty Materials Co., Ltd., "DC4-7081" (trade name, dimethyl silicone) Flame retardant: Magnesium hydroxide, "Maglac ST" (product name) manufactured by Shinkokogyo Co., Ltd. Antioxidant: Phenolic antioxidant, BASF Japan Ltd. "Irganox 1010" (trade name: pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate])

[0056] Based on the materials and blending amounts shown in Tables 1 to 3 below, each component was kneaded in a kneader at a temperature of 200° C. to prepare a resin composition. Next, the resin composition was extruded onto a copper wire having a diameter of 2.0 mm using an extrusion molding machine to prepare a test electric wire having a coating layer having a thickness of 0.8 mm.

[0057] The test wires were measured for the following items. 1.Flame retardant The oxygen index was calculated according to JIS K7201 (2007). An oxygen index of 20 or more can be judged to be excellent in flame retardancy. In addition, a 60° tilt test was conducted in accordance with JIS C3005 (2014). In the 60° tilt test, if the flame naturally extinguished within 60 seconds after ignition, it was judged as "passed," and if the flame extinguished for more than 60 seconds, it was judged as "failed."

[0058] 2. Bleeding When the test wires were touched with their hands, it was checked whether or not any silicone or antioxidant was attached to the hands. The test wires were touched with the fingertips without applying pressure, and the presence or absence of any attached matter was visually confirmed. If no attachment was found, it was evaluated as "absent" for oozing, and if attachment was confirmed, it was evaluated as "present".

[0059] 3. Coefficient of static friction The coefficient of static friction was measured using a static friction measuring instrument (TL102 type) manufactured by Trinity Labs in accordance with ASTM D1894 (2014). A coefficient of static friction of 0.60 or less was determined to have sufficient slipperiness and excellent workability.

[0060] 4. Density The density was measured according to JIS K7112 5.1 Method A (underwater displacement method). The density was 1.14 g / cm 3 If the density is equal to or less than this, it becomes easy to separate the density from polyvinyl chloride during waste disposal.

[0061] 5.Long term heat resistance The test wire was placed in a thermostatic chamber at 75°C and stored for 40,000 hours. Next, the tensile elongation was measured according to JIS C3005 (2014). Samples that had a tensile elongation of 50% or more after storage at 75°C compared to the tensile elongation before storage were judged to be "passed," and samples that were less than 50% were judged to be "failed."

[0062] The results are shown in Tables 1 to 3.

[0063] [Table 1]

[0064] [Table 2]

[0065] [Table 3]

[0066] From the results in Tables 1 to 3, all of Examples 1 to 24 had excellent flame retardancy, no exudation of silicone or antioxidant, and excellent slipperiness. In contrast, Comparative Examples 1, 2, 5, 6, 11 and 12 did not pass the standard for the 60° inclination method and were insufficient for use as a covering material for electric wires and cables. Comparative Examples 1, 2, 10 and 12 had a static friction coefficient exceeding 0.60, which meant that there was a risk of electric wires and cables getting caught during application, and the application properties were insufficient. In Comparative Examples 3 and 4, silicone oozing was observed, and the coating was insufficient for use as a wire / cable covering material. Comparative Example 7 has a density of 1.14 g / cm 3 The density was higher than 1000 kJ / cm, making density separation impossible. Comparative Example 8 did not pass the standard for long-term heat resistance and was insufficient for use as a coating material for electric wires and cables. In Comparative Example 9, exudation of the antioxidant was observed, and the coating was insufficient for use as a coating material for electric wires and cables.

[0067] It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. are possible as appropriate. In addition, the material, shape, dimensions, number, location, etc. of each component in the above-described embodiments are arbitrary and not limited as long as the present invention can be achieved.

[0068] Here, the features of the embodiments of the resin composition and the electric wire / cable according to the present invention described above will be briefly summarized and listed below in [1] to

[11] .

[0069] [1] a base resin containing 35 to 75 mass% of a non-polar olefin-based resin and 25 to 65 mass% of a polar olefin-based resin; For 100 parts by mass of the base resin, 0.5 to 3.0 parts by mass of a silicone compound having a molecular weight of 1,000 to 100,000; 0.5 to 3.5 parts by mass of a silicone compound having a molecular weight of 300,000 to 600,000; 15 to 55 parts by mass of a flame retardant; 0.1 to 0.7 parts by mass of an antioxidant; A resin composition comprising:

[0070] [2] The resin composition according to the above [1], wherein the flame retardant is at least one metal hydroxide selected from the group consisting of magnesium hydroxide, aluminum hydroxide, and calcium hydroxide.

[0071] [3] The resin composition according to the above [1] or [2], wherein the non-polar olefin resin is at least one selected from the group consisting of polyethylene, polypropylene, and an ethylene-propylene copolymer.

[0072] [4] The resin composition according to any one of the above [1] to [3], wherein the polar olefin-based resin is at least one selected from the group consisting of an ethylene-ethyl acrylate copolymer, an ethylene-vinyl acetate copolymer, and an ethylene-methyl acrylate copolymer.

[0073] [5] The resin composition according to any one of the above [1] to [4], wherein the antioxidant is at least one non-halogen antioxidant selected from the group consisting of phenol-based antioxidants, amine-based antioxidants, and phosphorus-based antioxidants.

[0074] [6] The resin composition according to any one of the above [1] to [5], characterized in that the base resin contains 40 to 70 mass % of the non-polar olefin-based resin and 30 to 60 mass % of the polar olefin-based resin.

[0075] [7] The resin composition according to any one of the above [1] to [6], wherein the content of the flame retardant is 20 to 50 parts by mass relative to 100 parts by mass of the base resin.

[0076] [8] Density is 1.14g / cm 3 The resin composition according to any one of the above [1] to [7], characterized in that:

[0077] [9] The resin composition according to any one of the above [1] to [8], which is used for covering an electric wire or cable.

[0078]

[10] The cable has a conductor and at least one coating layer formed on the outside of the conductor, An electric wire or cable, wherein the coating layer comprises a layer formed from the resin composition according to any one of the above [1] to [9].

[0079]

[11] The electric wire / cable according to

[10] above, characterized in that the coating layer is composed of two or more layers, and at least the outermost layer of the coating layer is formed from the resin composition according to any one of [1] to [9] above. [Explanation of symbols]

[0080] 1 electric wire 2 Cables 5 Covering layer 10 Conductors 11 Insulators 21 Sheath 1a,1b,1c electric wire

Claims

1. a base resin containing 35 to 75% by mass of a non-polar olefin-based resin and 25 to 65% by mass of a polar olefin-based resin; For 100 parts by mass of the base resin, 0.5 to 3.0 parts by mass of a silicone compound having a molecular weight of 1,000 to 100,000; 0.5 to 3.5 parts by mass of a silicone compound having a molecular weight of 300,000 to 600,000; 15 to 55 parts by weight of a flame retardant; 0.1 to 0.7 parts by mass of an antioxidant; Contains The flame retardant is at least one metal hydroxide selected from the group consisting of magnesium hydroxide, aluminum hydroxide, and calcium hydroxide. A resin composition characterized by:

2. 2. The resin composition according to claim 1, wherein the non-polar olefin resin is at least one selected from the group consisting of polyethylene, polypropylene, and an ethylene-propylene copolymer.

3. The resin composition according to claim 1 or 2, wherein the polar olefin resin is at least one selected from the group consisting of an ethylene-ethyl acrylate copolymer, an ethylene-vinyl acetate copolymer, and an ethylene-methyl acrylate copolymer.

4. The resin composition according to any one of claims 1 to 3, wherein the antioxidant is at least one non-halogen antioxidant selected from the group consisting of phenol-based antioxidants, amine-based antioxidants, and phosphorus-based antioxidants.

5. The resin composition according to any one of claims 1 to 4, characterized in that the base resin contains 40 to 70 mass% of the non-polar olefin-based resin and 30 to 60 mass% of the polar olefin-based resin.

6. 6. The resin composition according to claim 1, wherein the content of the flame retardant is 20 to 50 parts by mass per 100 parts by mass of the base resin.

7. Density is 1.14 g / cm ３ The resin composition according to any one of claims 1 to 6, characterized in that:

8. The resin composition according to any one of claims 1 to 7, which is used for covering an electric wire or cable.

9. The wire has a conductor and at least one coating layer formed on the outside of the conductor, An electric wire or cable, wherein the coating layer comprises a layer formed from the resin composition according to any one of claims 1 to 8.

10. The electric wire / cable according to claim 9, characterized in that the coating layer consists of two or more layers, and at least the outermost layer of the coating layer is formed from the resin composition according to any one of claims 1 to 8.

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