CN111825939B - Power supply cable using non-halogen flame-retardant resin composition - Google Patents
Power supply cable using non-halogen flame-retardant resin composition Download PDFInfo
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- CN111825939B CN111825939B CN202010273304.0A CN202010273304A CN111825939B CN 111825939 B CN111825939 B CN 111825939B CN 202010273304 A CN202010273304 A CN 202010273304A CN 111825939 B CN111825939 B CN 111825939B
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L31/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid; Compositions of derivatives of such polymers
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- C08L23/0853—Vinylacetate
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- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
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- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/448—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from other vinyl compounds
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention provides a power supply cable using a non-halogen flame-retardant resin composition, which has excellent flame retardance, low smoke generation, mechanical properties and low temperature properties. In the power supply cable, the sheath layer is composed of a non-halogen flame-retardant resin composition containing a base polymer and a flame retardant. Furthermore, the base polymer contains an ethylene vinyl acetate copolymer and an ethylene-alpha olefin copolymer modified with maleic anhydride. The vinyl acetate content in the base polymer is 40% by mass or more, and the content of the latter copolymer is 5% by mass or more and 30% by mass or less of the base polymer. The flame retardant contains magnesium hydroxide surface-treated with silane and spherical silica having an average particle diameter of 0.05 to 1.0 [ mu ] m, wherein the content of the magnesium hydroxide is 80 to 150 parts by mass and the content of the spherical silica is 10 to 80 parts by mass.
Description
Technical Field
The present invention relates to a power supply cable using a non-halogen flame-retardant resin composition having high flame retardancy and suppressing smoke generation during combustion.
Background
For cables used in railway vehicles and the like, characteristics such as flame retardancy, low smoke generation, mechanical characteristics, low temperature characteristics and the like are required. In order to obtain high flame retardancy, a material obtained by adding a halogen flame retardant such as chlorine or bromine to polyolefin is used. However, a large amount of substances containing these halogen flame retardants generate a large amount of toxic and harmful gases when burned, and also generate highly toxic dioxin depending on the burning conditions. In this case, from the viewpoints of safety in a fire and reduction of environmental load, cables using a halogen-free material (halogen-free material) containing no halogen substance as a coating material are becoming popular.
For example, patent document 1 discloses a technique related to the following cable: the cable is excellent in water-blocking property, chemical resistance and flame retardance, good in recycling property, high in safety to human bodies, free of harmful substances during combustion, and excellent in environmental protection. Specifically, the following cables are disclosed: a laminate tape having a heat fusion layer on one side of an aluminum tape having a thickness of 0.001mm to 0.03mm is attached to the outer periphery of a cable core so that the heat fusion layer faces outward to form a water-blocking layer, and a plastic sheath is coated on the water-blocking layer to fuse the water-blocking layer into a whole.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2001-6446
Disclosure of Invention
Problems to be solved by the invention
The present inventors have studied and developed a coating material such as an outer coating layer of a cable, and studied a resin composition which uses a non-halogen material as a polymer as a coating material and has excellent flame retardancy, low smoke generation, mechanical properties and low temperature properties.
For example, in the technique of patent document 1, since the slag generated during combustion is fragile, the following problems are involved: the combustion expands into the wire, causing expansion, vaporization, incomplete combustion of the internal combustibles, and deteriorating flame retardancy and smoke characteristics.
The present invention has been made in view of the above problems, and an object thereof is to provide a power supply cable using a non-halogen flame-retardant resin composition having excellent flame retardancy, low smoke generation, mechanical properties and low temperature properties.
Means for solving the problems
(1) A power supply cable using a non-halogen flame-retardant resin composition according to one embodiment of the present invention comprises a conductor, an inner semiconductive layer formed on the outer periphery of the conductor, an insulating layer formed on the outer periphery of the inner semiconductive layer, an outer semiconductive layer formed on the outer periphery of the insulating layer, a shield layer formed by winding a wire around the outer semiconductive layer, a belt layer formed by winding a belt around the shield layer, and a sheath layer formed on the outer periphery of the belt layer, wherein the sheath layer comprises a base polymer and a flame retardant, the base polymer comprises an ethylene vinyl acetate copolymer and an ethylene-alpha olefin copolymer modified with maleic anhydride, the flame retardant comprises magnesium hydroxide and silica, the content of the ethylene-alpha olefin copolymer modified with maleic anhydride is 5 to 30 mass% of the base polymer, the content of the magnesium hydroxide is 80 to 150 mass% of the base polymer, the average particle diameter of the silica is 0.05 to 10 mu m of the base polymer, and the average particle diameter of the silica is 0.80 mu m to 100.0 mass% of the base polymer.
(2) The outer diameter of the power supply cable is 30mm to 60mm, and the thickness of the sheath layer is 2mm to 4 mm.
(3) In the smoke test of the power supply cable, the light transmittance is 65% or more.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the power cable using the non-halogen flame-retardant resin composition of one embodiment of the present invention, a power cable having excellent flame retardancy, low smoke generation, mechanical properties, and low temperature properties can be obtained.
Drawings
Fig. 1 is a sectional view showing the constitution of a power supply cable.
Symbol description
1: a power supply cable; 2: a conductor; 3: an inner semiconductive layer; 4: an insulating layer; 5: an outer semiconductive layer; 6: a semiconductive belt layer; 7: a shielding layer; 8: a belt pressing layer; 9: and a sheath layer.
Detailed Description
(embodiment)
Structural description
Fig. 1 is a sectional view showing the constitution of a power supply cable. As shown in fig. 1, the power supply cable of the present embodiment includes a conductor 2 made of twisted wires, an inner semiconductive layer 3 formed on the outer periphery of the conductor 2, an insulating layer 4 formed on the outer periphery of the inner semiconductive layer 3, an outer semiconductive layer 5 formed on the outer periphery of the insulating layer 4, a semiconductive belt layer 6 formed by winding a semiconductive belt around the outer periphery of the outer semiconductive layer 5, a shielding layer 7 formed by winding a wire around the semiconductive belt layer 6, a belt layer 8 formed by winding a belt around the shielding layer 7, and a sheath layer 9 formed on the outer periphery of the belt layer 8.
The sheath layer 9 uses a non-halogen flame retardant resin composition.
The conductor 2 is formed by twisting a plurality of bare wires. As the bare wire, for example, a wire such as a tin-plated annealed copper wire can be used. The conductor 2 supplies, for example, a high-voltage power of 7000V or more.
The inner semiconductive layer 3 and the outer semiconductive layer 5 are provided to mitigate concentration of an electric field between the insulating layer 4 and the conductor 2 and an electric field between the insulating layer 4 and the shielding layer 7. The inner semiconductive layer 3 and the outer semiconductive layer 5 are made of a material having conductivity by dispersing conductive powder such as carbon in rubber such as ethylene propylene rubber or butyl rubber, for example. The inner semiconductive layer 3 and the outer semiconductive layer 5 are formed by extrusion molding.
The insulating layer 4 is formed by extrusion molding of a material such as ethylene propylene rubber, vinyl chloride, crosslinked polyethylene, silicone rubber, or a fluorine-based material.
As the semiconductive belt layer 6, for example, a material formed by impregnating a base fabric or nonwoven fabric formed by weaving warp and weft made of nylon, rayon, PET, or the like with a substance obtained by dispersing conductive powder such as carbon in rubber such as ethylene propylene rubber or butyl rubber can be used. As the semiconductive belt layer 6, for example, a material having a thickness of 0.1mm to 0.4mm and a width of 30mm to 70mm can be used. The semiconductive tape layer 6 is formed by winding a semiconductive tape around the outer periphery of the outer semiconductive layer 5 in a spiral shape along the longitudinal direction of the cable, for example, so as to overlap 1/4 to 1/2 of the tape width.
The shielding layer 7 is constituted by wires. The wire is made of a conductive material such as tin-plated soft copper, for example, a wire having a diameter of 0.4mm or more and 0.6mm or less may be used. The shield layer 7 is formed by spirally winding a wire around the semiconductive belt layer 6 in the axial direction of the cable. The shielding layer 7 is in use grounded.
The press belt layer 8 is constituted by a press belt. For example, a belt made of plastic or rayon having a thickness of 0.03mm to 0.2mm, and a width of 50mm to 90mm may be used as the belt. The push belt layer 8 is formed by winding a push belt around the outer periphery of the shield layer 7 in a spiral shape in the axial direction of the cable.
The sheath layer 9 is composed of a non-halogen flame-retardant resin composition containing a base polymer (resin component) and a flame retardant (metal hydroxide, silica).
The base polymer contains an ethylene vinyl acetate copolymer (EVA) and an ethylene- α -olefin copolymer modified with maleic anhydride (hereinafter also simply referred to as "maleic acid-modified ethylene copolymer").
The ethylene vinyl acetate copolymer (EVA) in the base polymer is 40 mass% or more, more preferably 50 mass% or more.
The ethylene-alpha olefin copolymer modified with maleic anhydride in the base polymer is 5 to 30 mass%. If the above-mentioned maleic acid-modified ethylene copolymer is less than 5 mass%, the low-temperature characteristics are lowered, and if it exceeds 30 mass%, the mechanical characteristics (tensile characteristics) are lowered. As the α -olefin, an α -olefin having 3 to 8 carbon atoms is preferably used in view of flexibility of the cable. Examples of such alpha olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, and 1-octene, and isomers thereof may be used. In addition, 1 kind of alpha olefin may be used, or 2 or more kinds may be used in combination.
The vinyl acetate content in the base polymer (resin component) is 40 mass% or more. If the vinyl acetate content is less than 40 mass%, the slag becomes brittle, and good flame retardancy and low smoke generation cannot be obtained.
The metal hydroxide is magnesium hydroxide, and is surface-treated with silane. Specifically, it is magnesium hydroxide surface-treated with a silane coupling agent. The mechanical properties are reduced if magnesium hydroxide which has not been surface-treated with silane is used. The content of the magnesium hydroxide surface-treated with silane is 80 to 150 parts by mass per 100 parts by mass of the base polymer. From the viewpoint of flame retardancy, it is necessary to be 80 parts by mass or more; from the viewpoint of low smoke generation, it is necessary to set 150 parts by mass or less.
The silica may be amorphous silica or crystalline silica. The silica is used for improving slag solidification and mechanical properties upon combustion. If silica is not added, the slag does not cure, and low smoke generation cannot be achieved. The silica has a spherical shape and an average particle diameter of 0.05 μm to 1.0 μm. More preferably, the average particle diameter is 0.15 μm or more and 0.3 μm or less. By using such silica, a balance of flame retardancy, low smoke generation, and mechanical properties can be achieved. In particular, the silica enters the gaps between the magnesium hydroxide by being spherical, so that the magnesium hydroxide is well dispersed. By setting the average particle diameter of the silica to 0.05 μm or more and 1.0 μm or less, the interaction with the polymer becomes appropriate, and the mechanical properties are improved. If the average particle diameter is less than 0.05. Mu.m, the interaction with the polymer is enhanced, the viscosity becomes large, and the processability (extrudability) becomes poor. Further, if the average particle diameter is more than 1.0. Mu.m, the interaction with the polymer becomes weak, and the mechanical properties are lowered. The average particle diameter of the silica may be used with a frequency accumulation of a value of median diameter (μm) in particle diameter D50 of just 50%. The shape of the silica (whether it is spherical) can be confirmed by an electron microscope. It was confirmed that the silica according to the present embodiment was in a particle state from a normal sphere to a substantially normal sphere. Such silica can be produced, for example, by flame hydrolysis. The content of silica is 10 to 80 parts by mass relative to 100 parts by mass of the base polymer. If the content of silica is less than 10 parts by mass, the dispersibility of magnesium hydroxide is lowered, and thus the flame retardancy and low smoke generation property are lowered. Further, if the content of silica exceeds 80 parts by mass, mechanical properties are lowered.
The non-halogen flame-retardant resin composition used for the power supply cable may contain other polymers (other EVA, other polyolefin modified with maleic acid, etc.), a crosslinking agent, a crosslinking auxiliary agent, a colorant, a lubricant, an antioxidant, etc. as required.
In the power supply cable according to the present embodiment, the outer diameter (diameter) is preferably 30mm to 60mm, and the thickness of the sheath layer is preferably 2mm to 4 mm.
In addition, according to the power supply cable of the present embodiment satisfying the above conditions, the slag of the sheath layer generated at the time of combustion is moderately strong and has a proper void fraction. The tough slag relaxes the stress caused by expansion of the insulating body or the like that burns and heats, and prevents the flame from penetrating into the power supply cable, thereby functioning as a heat insulating layer. The void fraction allows the gas component from the inside of the power supply cable due to the heat of combustion to be released to the sheath layer side, thereby suppressing incomplete combustion. Thus, the power supply cable according to the present embodiment is excellent in flame retardancy and low smoke generation.
The power supply cable according to the present embodiment may be used as, for example, an extra-high voltage cable laid on a railway vehicle (hereinafter referred to as an extra-high voltage cable for a railway vehicle). The extra-high voltage cable for a railway vehicle is laid along the roof and the wall so as to be connected to a pantograph disposed on the roof of the railway vehicle and a multi-compressor disposed below, for example. Here, the extra-high voltage means a voltage of 7000V or more.
[ description of the production method ]
Next, an example of a method of manufacturing the power supply cable 1 will be described.
The inner semiconductive layer 3, the insulating layer 4, and the outer semiconductive layer 5 are simultaneously extruded around the outer circumference of the conductor 2. Next, the semiconductive tape is spirally wound around the outer semiconductive layer 5 in the cable axial direction, thereby forming a semiconductive tape layer 6. Next, the wire is spirally wound around the semiconductive belt layer 6 in the cable axial direction, thereby forming the shield layer 7. Next, the push belt is spirally wound around the outer periphery of the shield layer 7 in the cable axial direction, thereby forming a push belt layer 8. Next, the above-mentioned non-halogen flame retardant resin composition is extrusion molded on the outer periphery of the pressure belt layer 8, thereby forming the sheath layer 9. Then the vulcanization of the sheath layer 9 is carried out. For example, in a continuous vulcanizing apparatus, vulcanization is performed in an atmosphere at 150 ℃ to 180 ℃ for 5 minutes to 60 minutes. This makes it possible to manufacture the power supply cable 1.
According to the power feeding cable of the present embodiment, a power feeding cable using a non-halogen flame-retardant resin composition excellent in flame retardancy, low smoke generation, mechanical properties and low temperature properties can be obtained.
Examples (example)
Hereinafter, the power cable using the non-halogen flame retardant resin composition according to the present embodiment will be described in more detail with reference to examples.
(Material name)
1)EVA 1) : LEVAPREN 600 (VA quantity: 60%)
2)EVA 2) : LEVAPREN 400 (VA amount: 40%)
3) Acid modified polyolefin 3) : acid-modified ethylene-alpha-olefin copolymer, "TAFMER MH5040", sanjing chemical Co., ltd "
4) Silane-treated magnesium hydroxide 4) : "Magnilin H10A" manufactured by HUBER Co "
5) Fatty acid treated magnesium hydroxide 5) : "Magnilin H10C" manufactured by HUBER Co "
6) Amorphous silica 6) : evonik corporation "Aerosil R972" (spherical, particle size 0.016 μm)
7) Amorphous silica 7) : "Sidistar T120U" (spherical, particle size 0.15 μm) manufactured by Elkem Co., ltd
8) Crystalline silica 8) : silver bond 925 (Block, particle size 1.6 μm)
9) Tert-butyl peroxy 2-ethylhexyl carbonAcid esters 9) : AKZO Co made into Trigonox 117'
10 Triallyl isocyanate 10) : "TAIC" manufactured by Japanese chemical Co., ltd "
11 Carbon (C) 11) : asahi Thermal made by Asahi Co., ltd "
12 Lithium hydroxystearate 12) : LS-6 manufactured by Nidong chemical industry Co "
Examples 1 to 9
On a conductor composed of tin-plated soft copper strands, a material obtained by dispersing carbon powder in ethylene propylene rubber as an inner semiconductive layer, ethylene propylene rubber as an insulating layer, and a material obtained by dispersing carbon powder in ethylene propylene rubber as an outer semiconductive layer were simultaneously extrusion-molded to obtain a 3-layer extrusion-coated wire comprising an inner semiconductive layer, an insulating layer, and an outer semiconductive layer. Next, a semiconductive tape was wound spirally in the cable axial direction on the 3-layer extrusion-coated wire, the wire was further wound spirally in the cable axial direction, and a pressure tape (for example, a PET tape and an intrusion-preventing soft tape) was wound spirally in the cable axial direction to form a core. Next, a sheath layer was coated on the core using an extruder, and then batch vulcanization was performed to obtain a power supply cable. The thickness of the sheath layer is about 3.1mm, and the outer diameter of the power supply cable is about 50.9 mm. The non-halogen flame retardant resin composition (components) constituting the sheath layer was set to the formulation composition shown in table 1.
Comparative examples 1 to 12
The formulation composition of the non-halogen flame-retardant resin composition constituting the sheath layer was changed as shown in table 1, and the same procedure as in examples 1 to 9 was followed to obtain a power supply cable.
For the obtained power supply cable, the vinyl acetate content was calculated, and processability, mechanical properties, flame retardancy, fuming property, and low temperature property were evaluated as follows.
Calculation of vinyl acetate content: the vinyl acetate content (also referred to as VA content [% ] by mass%) is the vinyl acetate content of the ethylene vinyl acetate copolymer. The VA amount can be determined based on JISK 7192. For example, when 85g of a polymer having a vinyl acetate content of 60% and 15g of a polymer having a vinyl acetate content of 0% are used, the content is "(60% ×85/100) + (0% ×15/100) =51%", and the VA amount is 51%. The VA amount is preferably 40% or more.
Processability (extrudability): the case where the extruder was able to extrude and had good appearance was designated as "possible", the case where the extruder was high in viscosity and was unable to extrude was designated as "impossible", and the case where the extruder was able to extrude but had poor appearance was designated as "impossible".
Mechanical properties (tensile properties): as mechanical properties, tensile properties were evaluated. The sheath layer was peeled off to form a test piece punched into a dumbbell shape, and the tensile strength and elongation were measured. The tensile test piece was subjected to measurement of load and elongation (Lb) until fracture. From the above load, the tensile strength (unit [ MPa ]) was calculated. Further, elongation at break (((Lb-La)/La) ×100[% ]) was calculated from the initial length La and the elongation Lb. The tensile strength of 10MPa or more was determined to be acceptable. The elongation at break was found to be 150% or more.
Flame retardancy: vertical tray burn test (VTFT) was performed based on EN 50266-2-4. The power cable was burned from the lower end for 20 minutes, and then was self-quenched, and the carbonization length from the lower end was measured. The case where the carbonized length was 250cm or less was regarded as "pass", and the case where the carbonized length exceeded 250cm was regarded as "fail".
Smoke generation: a3 m cube smoke test was performed based on EN 50268-2. In a 3-meter-cubic chamber, the power supply cable was burned with an alcohol fuel, and the concentration of smoke generated at this time was measured by the transmittance of light. In general, the criterion is often that the transmittance is 60% or more "acceptable", but the low smoke generation property at a higher level is aimed at, 65% or more is "acceptable", and the transmittance is less than 65% is "unacceptable".
Low temperature characteristics (low temperature elongation, -elongation at 40 ℃): as low temperature characteristics, tensile characteristics at-40℃were evaluated. The sheath layer was peeled off to form a test piece punched into a dumbbell shape, and the elongation at-40 ℃ was measured. The tensile test piece was measured for elongation (Lb) until breaking. Elongation at break (((Lb-La)/La). Times.100 [% ]) was calculated from the initial length La and the elongation Lb. The elongation at break of 20% or more was regarded as acceptable.
TABLE 1
As shown in table 1, the power supply cables of examples 1 to 9 were satisfactory in terms of the vinyl acetate content of 40% or more, processability (extrudability), mechanical properties (tensile properties), flame retardancy, fuming property, and low-temperature properties (low-temperature elongation).
In contrast, the power supply cables of comparative examples 1 to 12 were found to have defects in the content of vinyl acetate, processability (extrudability), mechanical properties (tensile properties), flame retardancy, fuming properties, and low temperature properties (low temperature elongation), and were found to be problematic as power supply cables.
Specifically, the following is described.
In comparative example 1, the composition blended with the sheath layer had high viscosity, and the processability (extrudability) was insufficient, so that a power supply cable could not be formed. This is considered because, as compared with example 1, a spherical silica having a particle diameter as small as 0.016 μm was used. Accordingly, as the silica, a silica having a particle diameter exceeding 0.016 μm, specifically an average particle diameter of about 0.05 μm to 1.0 μm, more preferably about 0.1 μm to 0.3 μm is preferably used.
In comparative example 2, fuming was not acceptable. This is considered to be because a lump-shaped silica having a large particle diameter was used as the silica in example 1. Accordingly, as the silica, a spherical silica having a particle diameter in the above range is preferably used.
In comparative example 3, the flame retardancy and fuming property were not satisfactory. This is considered to be because EVA having a smaller vinyl acetate content (VA amount) than that of example 1 is used, and thus the VA amount in the base polymer becomes smaller than 34% and lower than 40% based on the base polymer. Accordingly, as the VA amount in the base polymer, 40% or more is preferably used.
In comparative example 4, the mechanical properties (tensile properties) were not acceptable. Specifically, the tensile strength is lower than 10MPa. This is considered to be because the surface treatment of magnesium hydroxide was not subjected to silane treatment but to fatty acid treatment in comparison with example 1. Accordingly, as the surface treatment of magnesium hydroxide, a silane treatment is preferably performed.
In comparative example 5, the flame retardancy and fuming property were not satisfactory. This is considered to be because the amount (content) of silica added is small as compared with example 1. Accordingly, as the addition amount of silica, it is preferable that relative to 100 parts by mass of the base polymer: more than 5 parts by mass, more preferably 10 parts by mass (example 4).
In comparative example 6, the mechanical properties (tensile properties) were not acceptable. Specifically, the elongation at break is less than 150%. This is considered to be because the amount of silica added is large as compared with example 1. Accordingly, as the addition amount of silica, it is preferable that relative to 100 parts by mass of the base polymer: less than 100 parts by mass, more preferably 80 parts by mass or less (example 7).
In comparative example 7, the flame retardancy and fuming property were not satisfactory. This is considered to be because the amount of magnesium hydroxide added is small as compared with example 1. Accordingly, as the addition amount of magnesium hydroxide, it is preferable that with respect to 100 parts by mass of the base polymer: more than 60 parts by mass, and still more preferably 80 parts by mass or more (example 4).
In comparative example 8, fuming was not acceptable. This is considered to be because the amount of magnesium hydroxide added is large as compared with example 1. Accordingly, as the addition amount of magnesium hydroxide, it is preferable that with respect to 100 parts by mass of the base polymer: less than 170 parts by mass, more preferably 150 parts by mass or less (example 7).
In comparative example 9, the flame retardancy and fuming property were not satisfactory. This is considered to be because the amount of magnesium hydroxide added is small as compared with example 1. Accordingly, as the addition amount of magnesium hydroxide, it is preferable that with respect to 100 parts by mass of the base polymer: more than 50 parts by mass, and still more preferably 80 parts by mass or more (example 4). In comparative example 9, the total amount of magnesium hydroxide and silica added was small. In examples 1 to 9, the total amount of magnesium hydroxide and silica added was 90 parts by mass or more (example 4) per 100 parts by mass of the base polymer.
In comparative example 10, fuming was not acceptable. This is considered to be because the amount of magnesium hydroxide added is large as compared with example 1. Accordingly, as the addition amount of magnesium hydroxide, it is preferable that with respect to 100 parts by mass of the base polymer: less than 170 parts by mass, more preferably 150 parts by mass or less (example 7). In comparative example 10, the total amount of magnesium hydroxide and silica added was large. In examples 1 to 9, the total amount of magnesium hydroxide and silica added was 230 parts by mass or less (example 7) per 100 parts by mass of the base polymer.
In comparative example 11, the low temperature characteristic (low temperature elongation) was not acceptable. This is considered to be because the ethylene- α -olefin copolymer modified with maleic anhydride was not added as compared with example 1. Accordingly, it is preferable that: the maleic acid-modified ethylene copolymer is contained as a base polymer, and more preferably 5% by mass or more (example 8) of the base polymer is contained.
In comparative example 12, the mechanical properties (tensile properties) were not acceptable. This is considered to be because the amount of the ethylene- α -olefin copolymer modified with maleic anhydride added is large as compared with example 1. Accordingly, as the addition amount of the above maleic acid-modified ethylene copolymer, preferred as the base polymer is: less than 40% by mass, more preferably 30% by mass or less (example 9). In comparative example 12, the flame retardancy and the smoke generation property were not satisfactory. This is because the amount of the maleic acid-modified ethylene copolymer added is large, and the VA content in the base polymer becomes small, 36% or less than 40% as a reference.
(consider
Based on the above results, it is preferable to set: the ethylene vinyl acetate copolymer is added to the base polymer of the sheath layer in an amount of 50 mass% or more (the main component) and the vinyl acetate content is 40 mass% or more. In the case of using an ethylene-vinyl acetate copolymer having a high VA content, the vinyl acetate content may be 40 mass% or more even when the addition amount of the ethylene-vinyl acetate copolymer to the base polymer is about 40 mass%.
Further, based on the above results, the addition amount of the maleic acid-modified ethylene copolymer in the base polymer of the sheath layer is preferably 5 mass% or more and 30 mass% or less.
Further, based on the above results, it is preferable to set: the magnesium hydroxide as a flame retardant of the sheath layer is surface-treated with silane, and the content of the magnesium hydroxide is 80 to 150 parts by mass per 100 parts by mass of the base polymer.
Further, based on the above results, it is preferable to set: the silica as a flame retardant for the sheath layer is spherical having an average particle diameter of 0.05 μm to 1.0 μm, and the content of the silica is 10 to 80 parts by mass relative to 100 parts by mass of the base polymer.
By using a sheath layer composed of such a non-halogen flame-retardant resin composition, a power supply cable using the non-halogen flame-retardant resin composition excellent in flame retardancy, low smoke generation, mechanical properties and low temperature properties can be obtained.
In particular, in a power supply cable for high voltage, the outer diameter of the sheath layer is large, for example, 30mm to 60mm, more preferably 45mm to 60mm, and the thickness of the sheath layer is thick, for example, 2mm to 4mm, more preferably 3mm to 4mm, and in this case, the flame retardancy and low smoke generation property are easily obtained with a large number of parts burned in a combustion test, but by using the above non-halogen flame retardant resin composition, flame retardancy and low smoke generation property can be obtained.
The present invention is not limited to the above-described embodiments and examples, and various modifications are possible within the scope of the present invention.
Claims (3)
1. A power supply cable using a non-halogen flame retardant resin composition, comprising a conductor, an inner semiconductive layer formed on the outer periphery of the conductor, an insulating layer formed on the outer periphery of the inner semiconductive layer, an outer semiconductive layer formed on the outer periphery of the insulating layer, a shielding layer formed by winding a wire around the outer semiconductive layer, a belt layer formed by winding a belt around the shielding layer, and a sheath layer formed on the outer periphery of the belt layer,
the sheath layer contains a base polymer and a flame retardant,
the base polymer comprises an ethylene vinyl acetate copolymer and an ethylene-alpha olefin copolymer modified with maleic anhydride,
the ethylene vinyl acetate copolymer is added to the base polymer of the sheath layer in an amount of 50 mass% or more,
the flame retardant comprises magnesium hydroxide and silicon dioxide,
the vinyl acetate content in the base polymer is 40 mass% or more,
the content of the maleic anhydride-modified ethylene-alpha olefin copolymer is 5 to 30 mass% inclusive of the base polymer,
the magnesium hydroxide is surface-treated with silane, the content of the magnesium hydroxide is 80 to 150 parts by mass relative to 100 parts by mass of the base polymer,
the silica has a spherical shape having an average particle diameter of 0.05 to 1.0 [ mu ] m, and the content of the silica is 10 to 80 parts by mass per 100 parts by mass of the base polymer.
2. The power supply cable using a non-halogen flame retardant resin composition according to claim 1, wherein an outer diameter of the power supply cable is 30mm to 60mm, and a thickness of the sheath layer is 2mm to 4 mm.
3. The power supply cable using the non-halogen flame-retardant resin composition according to claim 1, wherein the light transmittance in a 3-meter cube smoke test based on EN50268-2 is 65% or more.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2019077052A JP7092090B2 (en) | 2019-04-15 | 2019-04-15 | Power transmission cable using non-halogen flame-retardant resin composition |
| JP2019-077052 | 2019-04-15 |
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| CN111825939A CN111825939A (en) | 2020-10-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO328601B1 (en) | 2002-06-07 | 2010-03-29 | Elkem As | Elastomeric compositions, process for the preparation of elastomeric compositions and the use of microsilica as a modifier in elastomeric compositions |
| NO328520B1 (en) | 2004-11-03 | 2010-03-08 | Elkem As | Polyamide plastic with high flame resistance and good processability |
| JP5617903B2 (en) | 2012-11-20 | 2014-11-05 | 日立金属株式会社 | Vehicle wires, vehicle cables |
| JP2015072743A (en) | 2013-10-01 | 2015-04-16 | 日立金属株式会社 | Wire and cable |
| JP2015067819A (en) | 2013-10-01 | 2015-04-13 | 日立金属株式会社 | Non-halogen resin composition, insulated wire and cable |
| JP6621168B2 (en) | 2014-11-20 | 2019-12-18 | 日立金属株式会社 | Power transmission cable using non-halogen flame retardant resin composition |
| JP2016100148A (en) | 2014-11-20 | 2016-05-30 | 日立金属株式会社 | Power transmission cable |
| JPWO2016175076A1 (en) | 2015-04-28 | 2017-05-18 | 住友電気工業株式会社 | Non-halogen flame retardant resin composition and insulated wire |
| JP6657643B2 (en) * | 2015-08-03 | 2020-03-04 | 日立金属株式会社 | Halogen-free flame-retardant resin composition, insulated wires and cables |
| JP2017050088A (en) | 2015-08-31 | 2017-03-09 | 日立金属株式会社 | Power transmission cable |
| JP6902205B2 (en) * | 2017-06-30 | 2021-07-14 | 日立金属株式会社 | cable |
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| JP7092090B2 (en) | 2022-06-28 |
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