KR20120005054A - Halogen-free flame retardant insulated electric wire - Google Patents

Abstract

The present invention provides a halogen-free flame-retardant insulated wire that can reduce leakage current at high frequency and high voltage, satisfy the requirements of flame retardancy and flexibility, and also help reduce environmental load.
The wire is a halogen-free flame retardant insulated wire having a conductor, a first insulating layer covering the conductor, and a second insulating layer covering the first insulating layer, wherein the first insulating layer is polyester resin 20 to 50. Nitrogen system with respect to 100 mass parts of resin components containing 20-50 mass parts of mass parts, 20-50 mass parts of polyphenylene ether resins, and 30-60 mass parts of components whose ratio of a styrene-type elastomer: polyolefin resin is 0: 100-100: 0. A second resin composition containing 5 to 70 parts by mass of a flame retardant and a dielectric constant of 3.2 or less, wherein the second insulating layer contains 150 to 250 parts by mass of a metal hydroxide with respect to 100 parts by mass of the resin component. Characterized in that consists of.

Description

Halogen-free flame retardant insulated wire {HALOGEN-FREE FLAME RETARDANT INSULATED ELECTRIC WIRE}

The present invention relates to a halogen-free flame retardant insulated wire used for wiring in electronic equipment such as liquid crystal televisions, copiers, computers, and the like.

In liquid crystal panels, such as a liquid crystal television, a cellular phone, a digital camera, and a personal computer, a light source (backlight) is normally provided behind the liquid crystal panel, and the transmitted light from the light source is used for display. Cold cathode tubes and the like are used for the light source of the backlight, and the high frequency and high voltage currents generated by the lighting circuits (step-up circuits) are supplied to the cold cathode tubes. Since the high frequency and the high voltage of the power supply to a cold cathode tube are advanced, the insulated wire used for supplying the said high frequency and high voltage current to a cold cathode tube needs to reduce leakage current, and the dielectric constant of an insulation layer is calculated | required. .

On the other hand, as the liquid crystal panel becomes thinner, the wiring space becomes narrower, and the diameter of the wire and the flexibility are demanded for the insulated wire. 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 UL (Underwriters Laboratories Inc.) standard. The UL standard specifies in detail various properties 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. Among these, flame retardancy needs to pass the vertical combustion test called a VW-1 test, and has become one of the most stringent requirements among UL standards.

As an insulated wire used for such an application, Patent Document 1 uses a flame retardant resin composition containing ultra low density polyethylene, a halogen flame retardant, and zinc oxide polymerized with a single site type metallocene catalyst as an insulating layer. Insulated wire is disclosed. The dielectric constant of the flame-retardant resin composition used for the insulating layer is lower than 3.3, and even if the thickness of the insulating layer is made thin, the leakage current of the high frequency and high voltage current can be reduced.

On the other hand, in order to meet the demand for reducing the environmental load, an insulated wire of halogen free containing no halogen element is required. When a halogen element is contained in an insulated wire, when a used insulated wire is incinerated, toxic gas, such as hydrogen chloride, may generate | occur | produce.

Generally, as a coating material of a halogen-free electric wire, the resin composition which flame-retarded by mix | blending metal hydroxides, such as magnesium hydroxide and aluminum hydroxide, with polyolefin resins, such as polypropylene, is used. For example, Patent Literature 2 discloses an insulated wire using a flame retardant resin composition in which magnesium hydroxide is mixed with an ethylene-vinyl acetate copolymer (EVA) as a flame retardant as an insulating layer. However, in order to pass the vertical combustion test VW-1, it is necessary to mix | blend a large amount of metal hydroxide in polyolefin resin. As a result, the dielectric constant of an insulating layer becomes high and leakage current increases in high frequency and high voltage applications. There is also a problem that the flexibility is lowered.

Patent Document 1: Japanese Patent No. 3279206

Patent Document 2: Japanese Patent Application Laid-Open No. 2000-219814

As described above, in the flame retardant resin composition using the metal hydroxide as the non-halogen flame retardant, increasing the compounding quantity of the metal hydroxide to satisfy the flame retardancy increases the dielectric constant and increases the leakage current. On the other hand, reducing the compounding amount of the metal hydroxide in order to lower the dielectric constant can not satisfy the flame retardancy.

In view of these circumstances, the present invention can provide a halogen-free flame-retardant insulated wire that can reduce leakage current at high frequency and high voltage, satisfy the required characteristics of flame retardancy and flexibility, and help reduce environmental load. Let's make it a task.

The present invention is a halogen-free flame-retardant insulated wire having a conductor, a first insulating layer covering the conductor, and a second insulating layer covering the first insulating layer, wherein the first insulating layer is a polyester resin 20 to 50 Nitrogen system with respect to 100 mass parts of resin components containing 20-50 mass parts of mass parts, 20-50 mass parts of polyphenylene ether resins, and 30-60 mass parts of components whose ratio of a styrene-type elastomer: polyolefin resin is 0: 100-100: 0. A second resin composition containing 5 to 70 parts by mass of a flame retardant and a dielectric constant of 3.2 or less, wherein the second insulating layer contains 150 to 250 parts by mass of a metal hydroxide with respect to 100 parts by mass of the resin component. It is a halogen-free flame-retardant insulated wire, characterized in that (claim 1).

In order to reduce the leakage current, it is necessary to lower the dielectric constant of the insulating layer. It has been found that the use of a low dielectric constant material in the inner layer portion in contact with the conductor is effective for reducing the leakage current. Therefore, the 1st resin composition whose dielectric constant is 3.2 or less is used for the 1st insulating layer which contact | connects a conductor. Moreover, the 1st resin composition has some flame retardance by the synergistic effect of a polyphenylene ether, a nitrogen-type flame retardant, and a polyester resin.

On the other hand, for the second insulating layer on the outside, the second resin composition containing the metal hydroxide having a high flame retardant effect at a constant ratio is given importance to flame retardancy. Although the dielectric constant of a 2nd resin composition becomes high, the leakage current can be reduced by making the dielectric constant of an inner layer low. With such a configuration, it is possible to achieve both a reduction in leakage current at high frequency and a high voltage and flame retardancy.

The 1st resin composition used as a 1st insulating layer which coat | covers a conductor mixes three components of polyester resin, polyphenylene ether resin, and styrene elastomer / polyolefin resin component. The resin composition containing a polyphenylene ether resin and a styrene elastomer / polyolefin resin component is a high elastic modulus and a rigid polyphenylene ether resin at room temperature, and an elongated and soft styrene elastomer / polyolefin resin component is used as a sea. It is assumed that the polymer alloy has a sea island structure. Adding a polyester resin further to this makes a three-component polymer alloy. Polyester resin is crystalline resin, Even if it is temperature above glass transition temperature, it can maintain a moderate elasticity modulus, and can maintain flexibility and extensibility. In addition, if the compatibility with the styrene-based elastomer is relatively high and can be uniformly dispersed in the styrene-based elastomer, the tensile strength is expressed as a whole. By containing a nitrogen-based flame retardant in such a resin component, flexibility can be expressed, the dielectric constant is low, and a certain flame retardance can be made.

Moreover, the mixing ratio of a styrene elastomer and polyolefin resin can be set arbitrarily. A styrene elastomer may be used independently and a polyolefin resin may be used independently. By mixing polyolefin resin, the crosslinking efficiency of a resin composition can be improved and heat resistance can be improved.

It is preferable to contain a styrene-based elastomer having a functional group as part of the styrene-based elastomer (claim 2). Styrene-based elastomers having functional groups act as compatibilizers. By adding a compatibilizer, the polyester resin, the styrene elastomer, or the polyolefin resin is mixed well, and the tensile elongation characteristic is improved.

It is preferable that a 1st resin composition contains 0.1-10 mass parts of trimethylol propane trimethacrylate further with respect to 100 mass parts of resin components (claim 3). Trimethylolpropane trimethacrylate is a crosslinking aid. By containing a crosslinking adjuvant further, the plasticization effect of resin is acquired and extrusion workability improves. Moreover, the crosslinking efficiency at the time of irradiation of ionizing radiation becomes high. Furthermore, trimethylolpropane trimethacrylate has good compatibility with the resin and can be easily mixed.

It is preferable that the load bending temperature of the said polyphenylene ether resin is 95 degreeC or more (claim 4). By using polyphenylene ether resin whose load bending temperature is 95 degreeC or more, the insulating layer with large mechanical strength is obtained.

It is preferable that the nitrogen-based flame retardant is melamine cyanurate (claim 5). By using melamine cyanurate as the nitrogen-based flame retardant, the thermal stability at the time of mixing is improved and the flame retardancy is also improved.

In the halogen-free flame-retardant insulated wire of the present invention, the outer diameter of the conductor is preferably 0.1 mm to 1 mm, and the sum of the thicknesses of the first insulating layer and the second insulating layer is preferably 0.1 mm to 1 mm (claim 6). The halogen-free flame-retardant insulated wire of such a diameter can be wired in a narrow space.

The first insulating layer and the second insulating layer are preferably crosslinked by irradiation with ionizing radiation (claim 7). When the insulating layer is crosslinked, heat resistance and mechanical strength are improved.

Effects of the Invention

Advantageous Effects of Invention The present invention can provide a halogen-free flame-retardant insulated wire that can reduce leakage current at high frequency and high voltage, satisfy the required characteristics of flame retardancy and flexibility, and help reduce environmental load.

As a utilization example of this invention, the wire harness of the internal wiring of electronic devices, such as a liquid crystal television, a mobile telephone, a digital camera, a personal computer, is mentioned.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the method of measuring the dielectric constant of an insulated wire.
Explanation of symbols
1: insulated wire 2: metal plate
3: water 4: impedance analyzer
L: Length of immersion of insulation coating in water

Polyphenylene ether is an engineering plastic obtained by oxidatively polymerizing 2,6-xyleneol synthesized using methanol and phenol as raw materials. Moreover, in order to improve the 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 the said polyphenylene ether resin single body and the 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 blending suitably.

In such a polyphenylene ether resin, the load bending temperature changes depending on the blending ratio of polystyrene, but when the load bending temperature is 95 ° C or higher, the tensile property of the wire coating is improved and the thermal deformation property is excellent. desirable. In addition, load bending temperature shall be the value measured by the load of 1.80 MPa by the method of ISO75-1 and 2.

As polyphenylene ether resin, polyphenylene ether resin which does not blend polystyrene can also be used. In this case, when low viscosity polyphenylene ether resin is used, the resin pressure at the time of extrusion process can be reduced, maintaining mechanical strength. As intrinsic viscosity of polyphenylene ether resin, 0.1-0.6 dl / g is preferable and its more preferable range is 0.3-0.5 dl / g.

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 partial hydrogenated polymer can be illustrated. Moreover, what introduce | transduced carboxylic acid, such as maleic anhydride, can also be used by blending suitably.

Among these, when the block copolymer elastomer of a styrene and a rubber component is used, in addition to improving extrusion workability, tensile elongation at break is improved and impact resistance is improved. 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, the thing of 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 point. 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.

The melt flow rate (abbreviated as "MFR"; measured at 230 ° C x 2.16 kgf according to JIS K 7210) serving as an index of molecular weight is preferably in the range of 0.8 to 15 g / 10 min. It is because extrusion workability will fall when melt flow rate is less than 0.8 g / 10min, and mechanical strength will fall when it exceeds 15 g / 10min.

Examples of the polyolefin resin used in the present invention include polyethylene, ultra low density polyethylene, polypropylene, ethylene vinyl acetate copolymers, binary or tertiary copolymers of ethylene, graft resins, olefin thermoplastic elastomers, and the like of the polymers. Can be. Among these, an ultra low density polyethylene and ethylene vinyl acetate copolymer are preferable at the point which is excellent in flexibility.

As polyester resin, PET (polyethylene terephthalate) resin, PBT (polybutylene terephthalate) resin, etc. can be used. In particular, PBT resin has a melting point close to the glass transition temperature of the polyphenylene ether, and thus has good extrusion processability. It is also excellent in flame retardancy.

The polyester resin, the polyphenylene ether resin, and the styrene elastomer / polyolefin resin component can be melt mixed at any ratio. However, in view of extrusion processability and flexibility of the electric wire, the polyester resin is used in the entire resin component. To 50 mass parts, a styrene-type elastomer / polyolefin resin component is 30 to 60 mass parts, and polyphenylene ether resin is 20 to 50 mass parts. When content of polyphenylene ether resin exceeds 50 mass parts, extrusion workability will fall. Moreover, when less than 20 mass parts, mechanical strength and flame retardance will fall. Similarly, when content of a polyester resin exceeds 50 mass parts, extrusion workability will fall, and when less than 20 mass parts, mechanical strength and flame retardance will fall. More preferable content of a polyester resin is 25 mass parts-40 mass parts.

In addition, when a styrene-based elastomer having a functional group is included as part of the styrene-based elastomer, the adhesion between the polyester resin and the styrene-based elastomer can be improved, thereby improving the high temperature characteristics. As a functional group, an epoxy group, an oxazoline group, an acid anhydride group, a carboxyl group, etc. can be illustrated, It can select suitably according to the kind of resin. As for content of the styrene-type elastomer which has a functional group, 1-20 mass parts is preferable with respect to 100 mass parts of resin components, and a more preferable range is 1-10 mass parts.

Moreover, as a resin component, it is possible to mix various resin in the range which does not impair the meaning of this invention.

As a nitrogen-based flame retardant used for this invention, a melamine resin, melamine cyanurate, etc. can be illustrated. The nitrogen-based flame retardant does not generate toxic gases such as hydrogen halide even when incinerated after use, so that the environmental load can be reduced. The use of melamine cyanurate as the nitrogen-based flame retardant is preferable in view of the thermal stability at the time of mixing and the effect of improving the flame retardancy. Melamine cyanurate can also be used by surface-treating with a silane coupling agent or a titanate coupling agent.

Content of the said nitrogen-based flame retardant shall be 5-70 mass parts with respect to 100 mass parts of resin compositions. It is because the flame retardance of an insulated wire will be inadequate when it is less than 5 mass parts, and elongation and extrusion workability will fall when it exceeds 70 mass parts. As for content of a nitrogen type flame retardant, 10-40 mass parts is more preferable.

Moreover, a crosslinking adjuvant can be added to a 1st resin composition. As the crosslinking aid, a polyfunctional monomer having a plurality of carbon-carbon double bonds in the molecule, such as trimethylolpropane trimethacrylate (TMPTMA), triallyl cyanurate, triallyl isocyanurate, etc., is preferably used. Can be. Moreover, it is preferable that a crosslinking adjuvant is liquid at normal temperature. It is because it is easy to mix with polyphenylene ether resin, a styrene elastomer, and polyolefin resin as it is a liquid. In particular, when trimethylolpropane trimethacrylate is used as the crosslinking aid, compatibility with the resin is improved, which is preferable. Moreover, in order to improve flame retardancy, you may add a phosphorus flame retardant. Phosphoric acid ester can be illustrated as a phosphorus flame retardant.

As a resin component used for a 2nd resin composition, in addition to resin used for the said 1st resin composition, polyolefin resins, such as polyethylene and a polypropylene, an ethylene vinyl acetate copolymer, an ethylene methyl acrylate copolymer, and an ethylene ethyl acrylate copolymer And arbitrary resins such as ethylene α-olefin copolymers such as ethylene methyl methacrylate copolymer. In particular, the ethylene vinyl acetate copolymer can be preferably used in view of extrudability and flexibility in the case of using a resin composition.

As a metal hydroxide used as a flame retardant, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, etc. can be illustrated. Among them, magnesium hydroxide having a particle diameter in the range of 0.1 to 3 µm is preferable from the viewpoint of extrusion processability.

Content of a metal hydroxide shall be 150-250 mass parts with respect to 100 mass parts of resin components. It is because the flame retardance of an insulated electric wire will become inadequate when less than 150 mass parts, and elongation and extrusion workability will fall when it exceeds 250 mass parts. A more preferable range is 150 mass parts-200 mass parts.

An antioxidant, an antioxidant, a lubricant, a processing stabilizer, a coloring agent, a heavy metal deactivator, a foaming agent, a polyfunctional monomer, etc. can be mixed with the 1st resin composition and the 2nd resin composition as needed. These materials are mixed using known melt mixers, such as a uniaxial extrusion type mixer, a pressurized kneader, and a Banbury mixer, and a resin composition is produced.

The halogen-free flame-retardant insulated wire of this invention coat | covers a conductor the 1st insulating layer which consists of said 1st resin composition, and coat | covers the 2nd insulating layer which consists of said 2nd resin composition on said 1st insulating layer. In order to form a 1st insulating layer and a 2nd insulating layer, a known extrusion molding machine can be used. In order to simplify the manufacturing process, it is preferable to simultaneously extrude and coat the first insulating layer and the second insulating layer.

As a conductor, a copper wire, an aluminum wire, etc. which are excellent in electroconductivity 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 1 mm or less. In consideration of ease of handling, the thickness is preferably 0.1 mm or more.

Although the thickness of a 1st insulating layer and a 2nd insulating layer can be suitably selected according to conductor diameter, it is preferable to make the sum total of the thickness of the whole insulation coating layer which combined the 1st insulating layer and the 2nd insulating layer into 0.1 mm-1 mm. The thinner the insulating coating layer is, the more excellent the flexibility is, but if it is too thin, flame retardancy cannot be secured. The insulated wire of this invention is excellent in the point which can ensure the flame retardance which passes the VW-1 flame retardance test even if the thickness of the whole insulation layer is made thin.

Moreover, when the 1st insulating layer and the 2nd insulating layer are bridge | crosslinked by the irradiation of ionizing radiation, it is preferable at the point which a mechanical strength improves. 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. Available.

Next, the best mode for implementing an invention is demonstrated by an Example. The examples do not limit the scope of the invention.

[Example]

[Examples 1 to 14]

(Production of Resin Composition 1)

Each component was melt-mixed by the formulation shown in Table 1. Using a biaxial mixer (26 mmφ, L / D = 48), melt mixing was carried out at a cylinder temperature of 230 ° C. and a screw rotation speed of 200 to 400 rpm, melt extrusion into strand shape, and then the melt strand was cooled and cut to prepare pellets.

(Production of Resin Composition 2)

Each component was mixed by the formulation shown in Table 2. After mixing at 130-160 degreeC using the open-roller of diameter 12 inches, the taken out sample was pelletized using the pelletizer.

(Production of insulated wire)

An insulated wire was manufactured by simultaneously extrusion coating an inner layer material with a 30 mm φ extruder and an outer layer material with a 25 mm φ extruder using a 30 mm φ extruder and a 25 mm φ extruder. A 19 strand twisted tin-plated copper wire (outer diameter 0.64 mm) was used for the conductor. The thickness of the 1st insulating layer (inner layer) which consists of resin composition 1 was 0.38 mm, and the thickness of the 2nd insulating layer (outer layer) which consists of resin composition 2 was 0.10 mm. Extrusion conditions were made the conductor preheating 60 degreeC, the temperature of the cylinder and die was set to 190-200 degreeC, and was set to the line flux 25 m / min. Moreover, each insulated wire was irradiated with an acceleration electron beam so that irradiation amount might be 120 kGray. Evaluation of the insulated wire was performed by each unexamined thing and the investigated thing.

(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. As the test conditions, the tensile velocity and the elongation at break were measured with samples of each of three points, with the tensile velocity = 500 mm / min, the distance between the mark lines = 25 mm, and the temperature = 23 ° C. It was determined as "passed" that the tensile strength is 10.3 MPa or more and the tensile elongation at break is 150% or more.

(Evaluation of coating layer: secant modulus)

Using a sample similar to the above tensile test, a tensile test was performed at a tensile rate of 50 mm / min, a distance between the marks, 25 mm, and a temperature of 23 ° C., and then the elastic modulus at the point where the elongation became 2% from the stress-elongation curve was calculated. It was. In addition, the evaluation of secant modulus was performed only by the unirradiated insulated wire.

(Evaluation of coating layer: permittivity, tanD)

The dielectric constant (epsilon) of the insulation coating of the insulated wire sample was measured by the following method. First, as shown in FIG. 1, the insulated wire 1 was immersed in the water 3 with the metal plate 2, and it used the impedance analyzer 4 (4276A LCZ meter made from Yokogawa Hewlett Packard). The capacitance and tanD were measured under the condition of the frequency of 1 kHz. The measured value of the electrostatic capacitance was divided by the immersion length L (m) in the water of the insulating coating, and the capacitance C (pF / m) per 1 m of the insulating coating was obtained. And the dielectric constant (epsilon) of the insulation coating was computed according to the following formula. Here, d1 is a conductor outer diameter and d2 is an insulation outer diameter.

ε = C × log (d2 / d1) /24.12

(Evaluation of coating layer: elongation residual ratio, tensile strength residual ratio)

After heat-processing the insulated wire which irradiated the electron beam on the conditions shown in Table 1, the conductor was taken out and the tension test of the coating layer was done. The measurement conditions are the same as the tensile test. Elongation residual and tensile strength residual were calculated | required as the original value as 100.

(Evaluation of insulated wire: flame retardancy test)

Five samples were provided for the VW-1 vertical flame retardant test of UL Standard 1581, 1080, and it judged how many of them passed. The criterion is that if 15 seconds of ignition were repeated five times for each sample, the cotton wool that was extinguished within 60 seconds and covered on the bottom was not burned down by the combustion drops, and the kraft paper attached to the upper part of the sample was burned. What was pressed or not was made into the pass. In addition, a flame-retardant test was performed only by the insulated wire investigated.

(footnote)

(* 1) Duranex 800FP melting point 224 degreeC made by Wintec Polymer Co., Ltd.

(* 2) Duranex 600LP Melting Point 170 ℃ made by Wintech Polymer Co., Ltd.

(* 3) Polyphenylene ether having a glass transition temperature of 215 ° C manufactured by Mitsubishi Engineering Plastics Co., Ltd.

(* 4) Polystyrene-modified polyphenylene ether having a softening point of 210 ° C and a load bending temperature of 125 ° C.

(* 5) Polystyrene-modified polyphenylene ether having a softening point of 210 ° C and a load bending temperature of 95 ° C.

(* 6) Styrene, ethylene, butylene and styrene copolymer, styrene content 30wt%, melt flow rate 3.5g / 10min (200 degreeC * 5kg)

(* 7) Ethylene vinyl acetate copolymer of 25% of vinyl acetate amount

(* 8) Ultra low density polyethylene with a density of 0.87 and a melt flow rate of 0.5 g / 10 min (190 ° C x 2.16 kg)

(* 9) Maleic acid modified styrene ethylene butylene styrene copolymer, styrene content 30wt%, melt flow rate 4.0g / 10min (200 ° C × 5kg)

(* 10) EP Friend (registered trademark) AT501 manufactured by Daicel Chemical Industry Co., Ltd.

(* 11) Nippon Shokubai Co., Ltd. oxazoline group-containing polymer epochross (registered trademark) RPS1005

(* 12) MC6000, manufactured by Nissan Chemical Industries, Ltd.

(* 13) Irganox1010 made by Chiba Specialty Chemicals

(* 14) Three Fox O made by Nippon Mars Co., Ltd.

(* 15) Ade caster CDA-1 made by Asahi Denka Kogyo Co., Ltd.

(* 16) Ethylene vinyl acetate copolymer of vinyl acetate amount 70%

(* 17) Ethylene vinyl acetate copolymer of vinyl acetate amount of 32%

(* 18) Average particle size 0.7 µm, stearic acid surface treatment

(* 19) FlamtardH manufactured by Nippon Light Metal Co., Ltd.

(* 20) Shiraishi calcium Co., Ltd. make, baguette # 30

(* 21) Shiraishi Calcium Co., Ltd. make, white chloride CCR (stearic acid treatment)

(* 22) Japan Mars Co., Ltd., three Fox E

Resin composition 1 used as the inner layer in Examples 1 to 14 had a low dielectric constant of 3.0 or lower in any blend, showing good electrical properties. Flame retardancy also passed the VW-1 combustion test in all samples. Furthermore, since tensile elongation is large and elongation residual after thermal aging is also large, flexibility is also favorable. In addition, since the inner layer and outer layer can be extruded simultaneously, the productivity is also excellent.

Claims (7)

A halogen-free flame retardant insulated wire having a conductor, a first insulating layer covering the conductor, and a second insulating layer covering the first insulating layer,
The first insulating layer,
Resin component 100 containing 20-50 mass parts of polyester resins, 20-50 mass parts of polyphenylene ether resins, and 30-60 mass parts of components whose ratio of a styrene-type elastomer: polyolefin resin is 0: 100-100: 0 5 to 70 parts by mass of a nitrogen-based flame retardant based on parts by mass,
It consists of the 1st resin composition whose dielectric constant is 3.2 or less,
The second insulating layer,
It consists of 2nd resin composition containing 150-250 mass parts of metal hydroxide with respect to 100 mass parts of resin components, characterized by the above-mentioned.
Halogen-free flame retardant insulated wires. The method of claim 1,
A halogen-free flame-retardant insulated wire comprising a styrene-based elastomer having a functional group as a part of the styrene-based elastomer. The method of claim 1,
The halogen-free flame-retardant insulated wire which the said 1st resin composition contains 0.1-10 mass parts of trimethylol propane trimethacrylates with respect to 100 mass parts of resin components. The method of claim 1,
The load-free bending temperature of the said polyphenylene ether resin is 95 degreeC or more, The halogen free flame-retardant insulated wire characterized by the above-mentioned. The method of claim 1,
Halogen-free flame-retardant insulated wire, characterized in that the nitrogen-based flame retardant is melamine cyanurate. The method of claim 1,
The outer diameter of the conductor is 0.1mm to 1mm,
The sum of the thicknesses of the first insulating layer and the second insulating layer is 0.1 mm to 1 mm.
Halogen-free flame retardant insulated wires. The method according to any one of claims 1 to 6,
A halogen-free flame retardant insulated wire, wherein the first insulating layer and the second insulating layer are crosslinked by irradiation with ionizing radiation.

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