KR20130057961A - Non-halogen flame-retardant resin composition, and electric wire and cable which are made using same - Google Patents

Abstract

A non-halogen flame-retardant resin composition having excellent tensile strength and tensile resistance, which is excellent in mechanical strength and flame retardancy such as flexibility and abrasion resistance, in particular, and which satisfies UL standards, and a wire / cable using the flame retardant resin composition as a coating layer. to provide. A halogen-free flame retardant resin composition containing 5 to 40 parts by mass of a phosphorus flame retardant with respect to 100 parts by mass of a resin component, in which 30 to 85 parts by mass of a polyolefin resin and 10 to 50 parts by mass of a polyphenylene ether resin are contained in 100 parts by mass of the resin component. Part, and 5 to 30 parts by mass of styrene-based elastomer, wherein the polyolefin resin is 5 to 60% by mass of the ethylene-propylene random copolymer polymerized using a metallocene catalyst, based on the entire polyolefin resin, and block copolymerized poly 30-95 mass% of propylene resin is contained with respect to the whole polyolefin resin.

Description

Non-halogen flame-retardant resin composition and electric wire and cable using the same {NON-HALOGEN FLAME-RETARDANT RESIN COMPOSITION, AND ELECTRIC WIRE AND CABLE WHICH ARE MADE USING SAME}

The present invention relates to a non-halogen flame retardant resin composition suitably used as a coating layer such as an electric wire, and an electric wire and a cable using the resin composition.

In internal wiring of OA devices such as copiers and printers and electronic devices, wire harnesses for feeding and transmitting signals are used in a large amount between printed boards and electronic parts such as sensors, actuators, and motors. .

With a wire harness, terminals, such as a connector which can bundle a plurality of electric wires and cables, can be inserted and inserted in a terminal, are joined. In view of flame retardancy, electrical insulation, and the like, PVC wires to which polyvinyl chloride (PVC) is applied are used as wires for wire harnesses. Since PVC wire is excellent in flexibility, it is easy to handle even when it is used as a wire harness and has sufficient strength, so that there is no problem that the insulation is torn or worn during wiring of the wire harness, and the pressure welding provided at the terminal The installation work of the connector is also excellent.

However, since the PVC electric wire contains a halogen element, when the incineration treatment of the used wire harness is carried out, there is a problem that toxic gas of hydrogen chloride is generated or dioxin is generated depending on the incineration conditions. While reducing is required, PVC cannot be said to be a preferable material as an insulating material.

In recent years, in order to respond to the high demand for reducing the environmental load, a halogen-free electric wire using a coating material containing no polyvinyl chloride resin or a halogen-based flame retardant has been developed. On the other hand, wires such as insulated wires and insulated cables used for in-flight wiring of electronic devices are generally required to have various characteristics that comply with the UL (Underwriters Laboratories Inc.) standard. The UL standard specifically defines various characteristics such as flame retardancy, heat deformation, low temperature properties, tensile properties after initial and thermal aging of the coating material, which the product must satisfy.

In the electric wire for crimping or crimping use, it is necessary to surround a wire harness in an electronic device. In this work, there is a possibility that scratches or tears may occur in the insulation coating of the electric wires, resulting in defects. Therefore, high cut-through strength is required for the insulated electric wires used in the wire harness.

Japanese Patent Laid-Open No. 2002-105255 (Patent Document 1) discloses a flame-retardant resin composition obtained by heating and kneading a metal hydrate with respect to a thermoplastic resin component in which an elastomer such as ethylene propylene rubber or styrene butadiene rubber is blended with a polypropylene resin. Is disclosed. By blending an elastomer, filler water solubility can be enhanced, and dynamic vulcanization of these elastomers has been studied to balance mechanical properties such as flexibility and elongation with extrusion processability and flame retardancy. However, these materials have poor wear resistance and edge resistance (cut-through characteristics) compared with PVC, and there is a problem that the flexibility is lowered and the balance of the characteristics is lost to improve these characteristics.

Further, Japanese Patent Laid-Open No. 2008-169234 (Patent Document 2) contains a resin component containing a polyamide resin or a polyester resin, a polyphenylene ether resin, and a styrene elastomer resin, and a nitrogen flame retardant. A halogen-free flame retardant resin composition is disclosed. Polyamide with high modulus and rigid polyphenylene ether resin and high elongation and soft styrene elastomer, polyamide which is crystalline resin and maintains elastic modulus even at temperature above glass transition temperature By further mixing the resin or the polyester resin, an insulated wire having flexibility, abrasion resistance, and edge resistance equivalent to PVC can be obtained.

Japanese Patent Publication No. 2002-105255 Japanese Patent Publication No. 2008-169234

The insulated wire used for a wire harness requires the high cut-through strength, and it is necessary to make it stronger than the conventional insulated wire. On the other hand, the insulated wire needs to satisfy the flame retardancy, heat resistance, and mechanical characteristics prescribed by UL standard. In order to increase the cut-through strength, it is conceivable to mix a large number of materials with high elastic modulus, i.e., the tensile elongation, in particular, the tensile elongation after heat aging may become small, and the UL standard may not be satisfied. In addition, there is a risk of destroying strain relief from the viewpoint of connector fitability.

Therefore, the present invention is a coating layer comprising a halogen-free flame retardant resin composition and a flame-retardant resin composition which are excellent in mechanical strength and flame retardancy such as flexibility and abrasion resistance, and particularly excellent in cut through characteristics and have tensile elongation characteristics satisfying UL standards. It is a subject to provide the electric wire and cable which were used as a target.

The present invention is a halogen-free flame retardant resin composition containing 5 to 40 parts by mass of a phosphorus flame retardant with respect to 100 parts by mass of a resin component, in which 30 to 85 parts by mass of a polyolefin resin and a polyphenylene ether system are contained in 100 parts by mass of the resin component. It contains 10-50 mass parts of resin, and 5-30 mass parts of styrene-type elastomers, The said polyolefin resin contains 5-60 randomly ethylene-propylene random copolymer superposed | polymerized using the metallocene catalyst with respect to the whole polyolefin resin. It is a halogen-free flame-retardant resin composition containing 30 mass%-95 mass% of mass% and block copolymerization polypropylene resin with respect to the whole polyolefin resin (claim 1).

Polyphenylene ether-based resin is a rigid material having a high elastic modulus at room temperature. Polyolefin resin can improve mechanical properties while being excellent in flexibility. Styrene-based elastomers not only have excellent flexibility and extrudability but also act as compatibilizers. By adding a compatibilizer, the polyolefin resin and the polyphenylene ether resin can be satisfactorily mixed to improve the mechanical properties.

As the polyolefin resin, an ethylene-propylene random copolymer (hereinafter sometimes referred to as metallocene random PP) polymerized using a metallocene catalyst and a block copolymerized polypropylene are used. Metallocene random PP has a uniform molecular weight and crystallinity, and has a low molecular weight component or a low crystal component. Therefore, since it is flexible and excellent in heat-aging aging characteristic, there exists an effect which enlarges tensile elongation or tensile elongation after heat aging. On the other hand, block copolymerized polypropylene has high elastic modulus and has an effect which can raise cut-through strength. By using metallocene random PP and block copolymerization polypropylene together at a specific ratio as polyolefin resin, cut-through strength and tensile elongation after heat aging can be compatible. As the polyolefin resin, homopolypropylene or polyethylene may be used in addition to these two kinds.

Invention of Claim 2 is a halogen-free flame retardant resin composition of Claim 1 in which the said polyolefin resin contains 5-20 mass% of low density polyethylenes with respect to the whole polyolefin resin further. By further containing low density polyethylene, the tensile elongation and the tensile elongation characteristic after heat aging can be improved more.

The invention according to claim 3 is the halogen-free flame retardant resin composition according to claim 1 or 2, wherein the styrene-based elastomer is a block copolymerized elastomer of styrene and a rubber component. When the styrene-based elastomer is a block copolymerized elastomer of styrene and a rubber component, the compatibility of the polyolefin-based resin and the polyphenylene ether-based resin is improved to obtain a resin composition having excellent mechanical properties.

The invention according to claim 4 is a halogen-free flame retardant resin composition according to any one of claims 1 to 3, wherein the polyphenylene ether is a polyphenylene ether resin obtained by melt blending polystyrene. By using the polyphenylene ether resin which melt-blended polystyrene, extrusion workability improves with workability at the time of melt-blending.

Invention of Claim 5 is an electric wire and a cable which used said halogen-free flame retardant resin composition as a coating layer. According to the present invention, a halogen-free insulated wire excellent in flame retardancy, flexibility, and cut through characteristics is obtained.

Invention of Claim 6 is 0.3 mm or less of thickness of the said coating layer, The said electric wire and cable characterized by the above-mentioned. When the thickness of the insulating coating layer is 0.3 mm or less, the difference with the electric wire by the prior art becomes remarkable in characteristics, such as a cut through characteristic, and exhibits the outstanding effect.

Invention of Claim 7 is the electric wire and cable of Claim 5 or 6 WHEREIN: The said coating layer is bridge | crosslinked by irradiation of ionizing radiation, It is an electric wire and a cable. As the coating layer is crosslinked, heat resistance and mechanical strength are improved.

According to the present invention, there is provided a halogen-free flame-retardant resin composition having excellent tensile strength, which is excellent in mechanical strength such as flame retardancy, flexibility, abrasion resistance, and particularly excellent cut-through characteristics, and satisfies UL standards, and a wire and cable using the same. can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the measuring method of cut through intensity | strength.

First, various materials used for the halogen-free flame retardant resin composition will be described. Polyphenylene ether is an engineering plastic obtained by oxidatively polymerizing 2, 6- xylenol synthesize | combined as methanol and a phenol as a raw material. Moreover, in order to improve the shaping | molding processability of polyphenylene ether, the material which melt-blended polystyrene to polyphenylene ether is marketed variously as modified polyphenylene ether resin. As polyphenylene ether resin used for this invention, any of said polyphenylene ether resin single body and polyphenylene ether resin which melt-blended polystyrene can be used. Moreover, what introduce | transduced carboxylic acid, such as maleic anhydride, can also be used by mixing suitably.

When polyphenylene ether resin which melt-blended polystyrene was used as polyphenylene ether resin, the workability at the time of melt-mixing with a styrene elastomer is preferable. Since polyphenylene ether resin which melt-blended polystyrene is excellent in compatibility with styrene-type elastomer, resin pressure at the time of extrusion process reduces, and extrusion processability improves.

In such polyphenylene ether-based resin, the load bending temperature changes depending on the blend ratio of polystyrene, but when the load bending temperature is 130 ° C or higher, the mechanical strength of the wire coating is increased, and the thermal deformation characteristics are excellent. Do. In addition, load deflection temperature is taken as the value measured by the load of 1.80 Mpa by the method of ISO75-1 and 2.

As a styrene-type elastomer used for this invention, a styrene ethylene butene styrene copolymer, a styrene ethylene propylene styrene copolymer, a styrene ethylene ethylene propylene styrene copolymer, a styrene butylene Styrene copolymer etc. are mentioned, These hydrogenated polymers and a partially hydrogenated polymer can be illustrated. Moreover, what introduce | transduced carboxylic acid, such as maleic anhydride, can also be used by mixing suitably.

Among these, when the block copolymer elastomer of a styrene and a rubber component is used, in addition to the extrusion processability improvement, it is preferable from a viewpoint of the tensile fracture elongation improving and impact resistance improving. Moreover, as a block copolymer, triblock type copolymers, such as a hydrogenated styrene butylene styrene block copolymer and a styrene isobutylene styrene copolymer, and a styrene ethylene copolymer, styrene ethylene Diblock copolymers, such as a propylene copolymer, can be used, and when a triblock component is contained 50 weight% or more in a styrene-type elastomer, since the intensity | strength and hardness of an electric wire film improve, it is preferable.

Moreover, what is 20 weight% or more of styrene content contained in a styrene-type elastomer can be used suitably from a mechanical characteristic and a flame retardance viewpoint. When styrene content is less than 20 weight%, hardness and extrusion workability will fall. Moreover, when styrene content exceeds 50 weight%, since tensile fracture elongation falls, it is unpreferable.

Moreover, it is preferable that melt flow rate (it stands for "MFR" and abbreviation; measured at 230 degreeC x 2.16 kgf according to JISK7210) used as the index of molecular weight is 0.8-15 g / 10min. It is because extrusion workability will fall when melt flow volume is less than 0.8 g / 10min, and mechanical strength will fall when it exceeds 15 g / 10min.

Examples of the polyolefin resin include polypropylene (homo polymer, block polymer, random polymer), polypropylene thermoplastic elastomer, reactor type polypropylene thermoplastic elastomer, dynamic crosslinked polypropylene thermoplastic elastomer, polyethylene (high density polyethylene, fabric Linear low density polyethylene, low density polyethylene, ultra low density polyethylene), ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene Between the molecules of butyl acrylate copolymer, ethylene propylene rubber, ethylene acrylic rubber, ethylene-glycidyl methacrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid copolymer or ethylene-acrylic acid copolymer Metals such as sodium or zinc The ionomer resin etc. which were intermolecularly couple | bonded with the ion can be used. Moreover, what modified these resin with maleic anhydride etc., and what has an epoxy group, an amino group, and an imide group can also be used.

Among the above polyolefin resins, metallocene random PP and block copolymerized polypropylene are essential components. Metallocene random PP is 5-60 mass% with respect to the whole polyolefin resin, and block copolymerization polypropylene is 30-95 mass% with respect to the whole polyolefin resin. When the content of the metallocene random PP is smaller than this range, the elongation after heat aging is small, and the UL standard cannot be satisfied. If the block copolymerized polypropylene is smaller than this range, the cut-through strength is insufficient. Moreover, when 5-20 mass% of low density polyethylenes are contained with respect to the whole polyolefin resin, elongation property after elongation and heat aging can be improved, and it is preferable.

As the phosphorus flame retardant, a polyphosphazene compound obtained by ring-opening polymerization of an phosphate ester, a phosphinic acid metal salt, a phosphate melamine compound, an ammonium phosphate compound or a cyclophosphazene can be used. These phosphorus flame retardants may be used alone or in combination of a plurality thereof.

Examples of the phosphate esters include trimethyl phosphate, triethyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl phenyl phosphate, cresyl 2,6-xylenyl phosphate and 2-ethylhexyl diphenyl phosphate. , 1,3-phenylenebis (diphenylphosphate), 1,3-phenylenebis (di-2,6-xylenylphosphate), bisphenol-A bis (diphenylphosphate), resorcinol bis-di Phenyl phosphate, octyl diphenyl phosphate, diethylene ethyl ester phosphate, dihydroxypropylene butyl ester phosphate, ethylene disodium ester phosphate, t-butyl phenyl diphenyl phosphate, bis- (t-butylphenyl) phenyl phosphate, tris- ( t-butylphenyl) phosphate, isopropylphenyldiphenylphosphate, bis- (isopropylphenyl) diphenylphosphate, tris- (isopropylfe Nil) phosphate, tris (2-ethylhexyl) phosphate, tris (butoxyethyl) phosphate, tris isobutyl phosphate, methyl phosphonic acid, methyl phosphonic acid dimethyl, methyl phosphonic acid diethyl, ethyl phosphonic acid, propylphosphonic acid, Butylphosphonic acid, 2-methyl-propylphosphonic acid, t-butylphosphonic acid, 2,3-dimethylbutylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, diethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid , Dioctylphosphinic acid, phenylphosphinic acid, diethylphenylphosphinic acid, diphenylphosphinic acid, alkyl phosphate esters and the like can be used.

The phosphinic acid metal salt is a compound represented by the following formula (1). In the formulas below, R ¹ and R ² are each an alkyl group having 1 to 6 carbon atoms or an aryl group having 12 or less carbon atoms, M is calcium, aluminum, or zinc, and when M = aluminum, m = 3, otherwise Is m = 2.

Examples of the phosphinic acid metal salt include aluminum salts of organic phosphinic acids such as EXOLIT OP1230, EXOLIT OP1240, EXOLIT OP930, and EXOLIT OP935 manufactured by Clariant Co., Ltd., or blends of aluminum salts of organic phosphinic acids such as EXOLIT OP1312 and melamine polyphosphate. Can be used.

As the melamine phosphate compound, polyphosphoric melamine such as MELAPUR200 manufactured by Chivas Specialty Co., Ltd., polyphosphoric melamine acid, melamine phosphate, melamine orthophosphate, melamine pyrophosphate or the like can be used.

As the ammonium phosphate compound, ammonium polyphosphate, polyphosphate amide, polyamide phosphate ammonium, polyphosphate carbamic acid or the like can be used.

As a polyphosphazene compound obtained by ring-opening-polymerizing cyclophosphazene, Otsuka Chemical Co., Ltd. product SPR-100, SA-100, SR-100, SRS-100, SPB-100L, etc. can be used.

Content of a phosphorus flame retardant shall be 5-40 mass parts with respect to 100 mass parts of resin components. When less than 5 mass parts, flame retardance is inadequate, and when it exceeds 40 mass parts, mechanical characteristics will fall. More preferable content of phosphorus flame retardant is 5-30 mass parts. Phosphorus-based flame retardants may be used by treating the surface with melamine, melamine cyanurate, fatty acids, and silane coupling agents. In addition, you may perform the integral blend which adds a surface treating agent, when mixing with a thermoplastic resin, without surface-treating previously. Moreover, you may use a nitrogen flame retardant in combination with phosphorus flame retardant. As the nitrogen-based flame retardant, melamine, melamine cyanurate and the like can be used.

Moreover, a crosslinking adjuvant can be added to the halogen-free flame retardant resin composition of this invention. As the crosslinking aid, a polyfunctional monomer having a plurality of carbon-carbon double bonds in a molecule such as trimethylolpropane trimethacrylate, triallyl cyanurate, triallyl isocyanurate, or the like can be preferably used. In addition, it is preferable that a crosslinking adjuvant is liquid at normal temperature. It is because it is easy to mix with a polyphenylene ether resin and a styrene elastomer if it is a liquid. Moreover, when trimethylol propane trimethacrylate is used as a crosslinking adjuvant, compatibility with resin improves and it is preferable.

In the halogen-free flame retardant resin composition of the present invention, an antioxidant, a processing stabilizer, a coloring agent, a heavy metal deactivator, a foaming agent, a multifunctional monomer, and the like can be appropriately mixed, if necessary, and these materials may be shortened. Can be prepared by mixing using a known melt mixer such as a pressurized kneader or a Banbury-mixer.

The insulated wire of this invention has a coating layer which consists of said flame-retardant resin composition, and a coating layer is formed directly or through another layer on a conductor. For forming the insulating coating layer, a known extruder such as a melt extruder can be used. Moreover, it is preferable to irradiate and bridge | crosslink an ionizing radiation to an insulating layer.

As the conductor, a copper wire, an aluminum wire, or the like excellent in conductivity can be used. Although the diameter of a conductor can be suitably selected according to a use application, in order to enable wiring to a narrow space, it is preferable to set it as 2 mm or less. In view of ease of handling, the thickness is preferably 0.1 mm or more. The conductor may be a single wire, or may be one obtained by twisting a plurality of element wires.

Although the thickness of a coating layer can be suitably selected according to a conductor diameter, when the thickness of a coating layer is 0.3 mm or less, it is preferable at the point of mechanical strength. In the halogen-free electric wire according to the prior art, the wear resistance and the cut-through strength decrease when the thickness of the coating layer is 0.3 mm or less, but according to the present invention, excellent performance is obtained when the thickness of the coating layer is 0.3 mm or less. The difference with the electric wire is remarkable. In the wire for welding, a wire having a thickness of 0.3 mm or less is preferably used from the viewpoint of compatibility with the connector.

If a coating layer is bridge | crosslinked by the irradiation of ionizing radiation, mechanical strength improves and it is preferable. Examples of the ionizing radiation source include accelerated electron beams, gamma rays, X-rays, α-rays, ultraviolet rays, and the like. Accelerated electron beams are most preferable from the viewpoint of industrial use, such as ease of using a source, transmission thickness of ionizing radiation, and speed of crosslinking treatment. Can be used.

Example

Next, the present invention will be described in more detail with reference to Examples. The examples do not limit the scope of the invention.

[Examples 1 to 5]

(Creation of halogen-free flame retardant resin composition pellets)

Each component was mixed by the compounding prescription shown in Table 1. In addition, in a table | surface, the unit of a base resin, a flame retardant, an antioxidant, and a crosslinking adjuvant is a mass part. Using a biaxial mixer (45 mmφ, L / D = 42), the mixture was melt mixed at a cylinder temperature of 240 ° C. and a screw rotation speed of 100 rpm, melt-extruded into a strand shape, and then the melt strand was cooled and cut to produce pellets.

(Production of insulated wire)

Using a single-screw extruder (30 mmφ, L / D = 24), extrude and coat the conductors (twisted 7 tin-plated copper wires, conductor diameter 0.42 mm) to a thickness of 0.14 mm. The insulated wire was produced by irradiating 30 kGy or 60 kGy electron beams of acceleration voltage 2MeV. In addition, mechanical characteristics (after initial stage and heat aging) were evaluated using what removed the conductor from the created insulated wire, and used only the coating layer.

(Evaluation of Coating Layer: Tensile Properties)

The conductor was removed from the produced electric wire and the tensile test of the coating layer was done. The test conditions were made into tensile velocity = 500 mm / min, mark distance = 25 mm, temperature = 23 degreeC, Tensile strength and tensile elongation (break elongation) were measured with each sample of 3 points, and their average value was calculated | required. Tensile strength was 10.3 Mpa or more, and the thing of 150% or more of tensile elongation was determined as "passing."

(Evaluation of coating layer: secant modulus

Using the same sample as the above tensile test, after performing a tensile test at a tensile velocity of 50 mm / min, a distance between marks, 25 mm and a temperature of 23 ° C., the elastic modulus at the point where the elongation becomes 2% from the stress-elongation curve is calculated. did.

(Evaluation of coating layer: heat resistance)

After leaving the insulated wires in a gear oven set at 136 ° C. for 168 hours (7 days), the tensile test was performed in the same manner as the evaluation of the tensile properties, and the tensile strength before the heat treatment and the tensile elongation were compared. The residual ratio of at least 75% and the tensile elongation compared to the tensile strength before heat treatment were 45% or more as the pass level.

(Evaluation of insulated wire: flame retardancy test)

The VW-1 vertical combustion test described in UL standard 1581, 1080 was performed with five samples. When 15 seconds of ignition are repeated five times for each sample, the fire is extinguished within 60 seconds, and the cotton wool placed on the bottom does not burn by the combustion drops, and the kraft paper attached on the upper part of the sample does not burn or grind. did. When even one point among five points of samples did not become a pass level, it was set as rejection.

(Evaluation of Insulated Wire: Cut-Through Strength)

Cut-through strength was measured using the measuring apparatus shown in FIG. A knife 4 having a 90 ° sharp edge (tip R = 0.125mm, tip angle 90 °) is placed on the insulated wire 3 made of the conductor 1 and the covering layer 2, and the flow is between the conductor and the sharp edge. Measure the current value. In the initial state, the conductor and the sharp edge are insulated by the coating layer 2, and no current flows. However, when the coating layer 2 is cut by the knife 4, the current flows between the conductor and the sharp edge. A load is applied to the knife 4 to measure the maximum load that the coating layer 2 withstands without cutting. In addition, a test atmosphere shall be temperature of 23 degreeC, and humidity of 50% RH. A load of 70 N or more is considered a pass level.

[Comparative Examples 1 to 7]

Except having used the resin composition which has a compounding prescription shown in Table 2, the insulated wire was produced like Examples 1-5, and series of evaluation was performed. In addition, in a table | surface, the unit of a base resin, a flame retardant, an antioxidant, and a crosslinking adjuvant is a mass part. The results are shown in Table 2.

(footnote)

(* 1) Block copolymerized polypropylene resin: Novatech EC9 manufactured by Nippon Polypro Co., Ltd.

(* 2) Ethylene-propylene random copolymer polymerized using a metallocene catalyst: WELNEX RFG4VA manufactured by Nippon Polypro Co., Ltd.

(* 3) Homo polypropylene: Novatech EA9BT manufactured by Nippon Polypro Co., Ltd.

(* 4) Low density polyethylene: NUC-8007 (MFR = 7 g / 10min) made by Nippon Unicar Co., Ltd.

(* 5) Polyphenylene ether resin with an intrinsic viscosity of 0.47 dl / g

(* 6) Styrene-based elastomer: Asahi Kasei Co., Ltd .: Toughtech (registered trademark) H1043

(* 7) Condensed Phosphate Ester: Daihachi Chemical Co., Ltd. PX-200 (Phosphorus 9.0%)

(* 8) Irganox1010 made by Chiba Specialty Chemicals

(* 9) SEENOX 412S made by Cipro Chemical Co., Ltd.

(* 10) Trimethylol propane trimethacrylate: TD1500S made by DIC Corporation

Any of the insulated wires of Examples 1 to 5 has a high cut through strength of 70 N or more. In addition, the initial tensile elongation and the tensile elongation after heat aging are also pass levels. Compared with Example 1 which does not use low density polyethylene, Examples 2-5 which use low density polyethylene are increasing the tensile elongation after heat aging. In addition, when the content of the metallocene random PP is increased, the tensile elongation and the tensile elongation after heat aging increase.

The metallocene random PP is not contained in the halogen-free flame retardant resin composition used for the insulated wire of Comparative Examples 1-7. Although the cut-through strength is either high or acceptable, the tensile elongation after heat aging is small. Homo PP with high elastic modulus is added to Comparative Examples 6 and 7, and the elastic modulus of a resin composition becomes high. The cut-through strength is also increased due to the improved elastic modulus, but the tensile elongation after heat aging is small, and the pass level is not reached.

1: conductor
2: coating layer
3: insulated wire
4: knife

Claims (7)

As a halogen-free flame retardant resin composition containing 5-40 mass parts of phosphorus flame retardants with respect to 100 mass parts of resin components, in 100 mass parts of said resin components,
30 to 85 parts by mass of polyolefin resin, 10 to 50 parts by mass of polyphenylene ether resin, and 5 to 30 parts by mass of styrene elastomer,
The said polyolefin resin is 5-60 mass% with respect to the whole polyolefin resin, and 30-95 mass with block copolymerized polypropylene resin with respect to the whole polyolefin resin for the ethylene-propylene random copolymer superposed | polymerized using the metallocene catalyst. Halogen-free flame-retardant resin composition containing%. The method of claim 1,
The said polyolefin resin is halogen-free flame-retardant resin composition which further contains 5-20 mass% of low density polyethylene with respect to the whole polyolefin resin. 3. The method according to claim 1 or 2,
The halogen-free flame retardant resin composition, wherein the styrene-based elastomer is a block copolymerized elastomer of styrene and a rubber component. The method according to any one of claims 1 to 3,
Halogen-free flame retardant resin composition whose said polyphenylene ether is polyphenylene ether resin which melt-blended polystyrene. The electric wire and cable which used the halogen-free flame retardant resin composition in any one of Claims 1-4 as a coating layer. The method of claim 5, wherein
The electric wire and cable whose thickness of the said coating layer is 0.3 mm or less. The method according to claim 5 or 6,
An electric wire and a cable in which the said coating layer is bridge | crosslinked by the irradiation of ionizing radiation.

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