JP2009093900A - Multi-core flat insulated wire and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-core flat insulated wire which is fire-retardant and is less apt to have blocking due to high temperature, even in a state of non-cross-linking and which is superior in terminal processing (cutting of multi-core flat insulated wire, peeling process of insulator of terminal processing), and to provide its manufacturing method. <P>SOLUTION: This is the fire-retardant multi-core flat insulated wire which does not contain halogen compounds, and its insulation coating is formed by cross-linking a molding resin composition, containing ethylene vinyl-acetate copolymer, fatty acid amide, and metal hydroxide. In the molding resin composition, the content of fatty acid amide is 1-4 wt.%, and the total amount of vinyl-acetate with respect to the total amount of ethylene vinyl-acetate copolymer is 40-70 wt.%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a thin multi-core flat insulated wire used for electrical wiring of electronic / information equipment and the like.

  Conventionally, halogen compounds have been used as flame retardants in insulating coatings in insulated wires for in-device wiring. However, the generation of highly corrosive halogen gas at the time of incineration of electric wires has been regarded as a problem of global environmental pollution, and the development of flame retardant insulated wires that do not contain halogen compounds is now underway. Yes.

  On the other hand, various electronic and information devices have been reduced in size and weight, and the wires for electrical wiring have been flattened with thin insulation to reduce space and improve wiring workability. Yes.

In Patent Document 1, a molding resin obtained by adding magnesium hydroxide to an ethylene vinyl acetate resin containing 22 to 30% by weight of vinyl acetate is coated on a multi-core conductive wire and molded by a molding roller, and then the A flame retardant multi-core flat insulated electric wire that does not contain a halogen compound is created by crosslinking the molding resin.
JP 2002260452 A

  However, the flat insulated electric wire created by the above method is after being molded by a molding roller, and in an uncrosslinked and cured state before cross-linking, blocking (sticking of electric wires) occurs at a high temperature (about 40 ° C.). was there.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a multicore flat insulated wire that is flame retardant and that is unlikely to block at high temperatures even in an uncrosslinked state.
Another object of the present invention is to provide a multi-core flat insulated wire excellent in terminal processability (cutting of a multi-core flat insulated wire and stripping of an insulator for terminal processing) in addition to the above object.
Furthermore, an object of this invention is to provide the manufacturing method of the said multi-core flat insulated wire.

The multi-core flat insulated wire and the manufacturing method thereof according to the present invention are as follows.
(1) A flame retardant multi-core flat insulated wire not containing a halogen compound,
The insulating coating is formed by crosslinking a molding resin composition containing an ethylene vinyl acetate copolymer, a fatty acid amide, and a metal hydroxide,
In the molding resin composition, the content of fatty acid amide is 1 to 4% by weight, and the total amount of vinyl acetate is 40 to 70% by weight with respect to the total amount of ethylene vinyl acetate copolymer, Multi-core flat insulated wire.
(2) The multi-core flat insulated electric wire according to (1), wherein the molding resin composition does not contain a silane coupling agent.
(3) A method for producing a flame retardant multi-core flat insulated wire not containing a halogen compound,
It contains an ethylene vinyl acetate copolymer, a fatty acid amide, and a metal hydroxide, and the content of the fatty acid amide is 1 to 4% by weight, and the total amount of vinyl acetate is 40 with respect to the total amount of the ethylene vinyl acetate copolymer. A molding resin composition of ~ 70% by weight is extruded to form a coated tape,
Subsequently, a plurality of conductors arranged in parallel at a predetermined interval are sandwiched between the coating tapes from both sides and laminated by a molding roller and pressure-molded to form an insulating coating,
Then, the manufacturing method of the multi-core flat insulated wire characterized by bridge | crosslinking the said insulation coating.
(4) The multi-core flat insulated wire is cut into a predetermined length either before or after cross-linking, and both ends are processed so as to be connectable to press contact terminals. Manufacturing method of core flat insulated wire.

  The multi-core flat insulated electric wire of the present invention is flame retardant, is less likely to cause blocking at high temperatures even in an uncrosslinked state, and has excellent terminal processability, so that it is excellent in handleability.

Hereinafter, an embodiment of a multi-core flat insulated wire according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an example of the multi-core flat insulated wire of the present invention. The multi-core flat insulated wire 10 has a structure in which the periphery of a plurality of conductors 11 arranged in parallel at a predetermined pitch is laminated with an insulating coating material (also simply referred to as a coating material) 12.
The conductor 11 is made of a single wire obtained by applying tin plating or the like to an annealed copper or aluminum wire, or a stranded wire obtained by twisting a plurality of thin single wires. The covering material 12 is formed by laminating a molding resin composition described later and then crosslinking and curing the molding resin composition by γ-ray irradiation. In addition, you may irradiate an electron beam other than a gamma ray for irradiation bridge | crosslinking.

Hereinafter, the molding resin composition used for the multi-core flat insulated wire according to the present invention (hereinafter also referred to as the molding resin composition according to the present invention) will be described.
The molding resin composition according to the present invention contains an ethylene vinyl acetate copolymer (abbreviation: EVA) as a base resin, a fatty acid amide as a lubricant, and a metal hydroxide as a flame retardant. In the molding resin composition, the total amount of vinyl acetate (abbreviation: VA) is adjusted to 40 to 70% by weight with respect to the total amount of the ethylene vinyl acetate copolymer. Furthermore, 1 to 4 weight% of fatty acid amides are contained in the molding resin composition.
The uncrosslinked multi-core flat insulated wire 10 before γ-ray irradiation is blocked at a high temperature (about 40 ° C.), but the total amount of vinyl acetate in the molding resin composition is within the above range, and the fatty acid amide is within the above range. By containing, blocking can be suppressed even at high temperatures. Moreover, the flame retardancy is also good.

Blocking occurs when the temperature rises during storage of the multi-core flat insulated wire 10 in an uncrosslinked state before γ-ray irradiation, and also occurs due to heating during crosslinking by γ-ray irradiation.
If the molding resin composition according to the present invention is used, even if the multi-core flat insulated wire 10 is elongated and is wound around the reel in a coiled state by cross-linking by γ-ray irradiation, the heat generated during the cross-linking Therefore, the blocking is eliminated and the handling property is remarkably improved. Further, even when γ-ray irradiation is performed after terminal processing, it is also possible to perform γ-ray irradiation in a state where a plurality of multi-core flat insulated wires 10 are bundled.

The molding resin composition according to the present invention contains a metal hydroxide as a flame retardant. The metal hydroxide flame retardant makes the base resin flame retardant by lowering the temperature of the combustion product due to the endothermic action during thermal decomposition. The metal hydroxide is preferably selected from magnesium hydroxide, zinc hexahydroxide (ZnSn (OH) ₆ ), and aluminum hydroxide. Magnesium hydroxide, zinc hexahydroxide (ZnSn (OH) ₆ ) More preferably, it is chosen from. In the molding resin composition according to the present invention, the flame retardant is preferably contained in an amount of 40 to 70% by weight. When the content of the flame retardant is too small, the flame retardancy is inferior. When the content is too large, the resin forming the coating material cannot be extruded.

  The molding resin composition according to the present invention contains a fatty acid amide as a lubricant. The fatty acid amide preferably has 18 to 22 carbon atoms, and oleic acid amide is particularly preferable. By using a fatty acid amide as the lubricant, it is possible to suppress surface stickiness of the coating material 12 and suppress blocking at high temperature, and also improve the surface slipperiness, so that the terminal processability is also good. In the resin composition for molding according to the present invention, 1 to 4% by weight of fatty acid amide is contained. When the content of the fatty acid amide is small, blocking cannot be suppressed. On the other hand, when the content of the fatty acid amide is too large, the flame retardancy is poor.

  Moreover, it is preferable that the molding resin composition concerning this invention does not contain a silane coupling agent. In general, in a flat insulated wire, a silane coupling agent is added to a covering material in order to improve the tensile strength, but the present inventors combined the conductor 11 and the covering material 12 with each other. It was found that the terminal processability was lowered. Therefore, it is preferable not to add a silane coupling agent to the molding resin composition according to the present invention. As a result, the bonding between the conductor 11 and the covering material 12 becomes good, and the terminal pulling-out force in the step of peeling off the covering material 12 and the stripping after the terminal processing is performed in any case before and after γ-ray irradiation. Waste residue can be greatly reduced.

Hereinafter, the manufacturing method and modification of the multi-core flat insulated wire 10 shown in FIG. 1 will be described with reference to the drawings.
2 is a schematic view showing an example of a laminating process of the multi-core flat insulated wire 10 shown in FIG. 1, wherein 10 is a multi-core flat insulated wire, 11 is a conductor, 12a is a covering tape, 13 is a T die, 14 Indicates a forming roller, and 15 indicates a reel. The covering tape 12a is continuously formed in the form of an uncrosslinked film or sheet by extrusion molding of the T-die 13 using the above-described molding resin composition. The reel 15 is for winding up the uncrosslinked multi-core flat insulated wire 10 before γ-ray irradiation, and the material is not particularly limited.

  The plurality of conductors 11 are arranged in parallel at a predetermined pitch and transferred in the direction of the arrow, and the covering tape 12a is transferred to the forming roller 14 so as to sandwich both surfaces of the plurality of conductors 11 arranged in parallel. The covering tape 12a is pressurized by the forming roller 14, laminated integrally with the conductor 11 in between, and formed into a predetermined shape.

  FIG. 3 shows a schematic diagram of the molding roller 14 and the covering molding state. The forming roller 14 is composed of a pair of rollers that pressurize both surfaces of the covering tape 12a, and has an uneven surface 14a for forming the outer peripheral surface into a predetermined shape. The molding surface of the molding roller 14 is subjected to a surface treatment such as a fluororesin coating so that it does not adhere to the covering tape 12a. Further, the forming roller 14 includes means for heating or cooling as necessary. The multi-layer flat insulated electric wire 10 is formed by integrating the common covering material 12 by laminating the covering tape 12 a on both sides of the conductor 11 by adhesion or fusion by the forming roller 14.

  As a specific example, the multi-core flat insulated wire 10 has a thickness of about 1 mm and a coating thickness t of about 0.2 mm. The coating thickness t of the coating material 12 may be formed as thin as possible within a range where predetermined electrical insulation resistance and withstand voltage can be obtained. Further, the arrangement pitch p of the conductors 11 is desirably adjusted to the arrangement pitch of the connected electrical connectors and connection terminals, depending on the conductor diameter, and is about 1.5 mm to 5 mm. The length of the covering material can be from a minimum of about 5 mm to a maximum of any length.

After the laminating step, in order to give a desired hardness to the covering material 12 formed by laminating the covering tapes 12a, the multi-core flat insulated wire 10 is crosslinked and cured by γ-ray irradiation.
FIG. 4 is a schematic view showing an example of the γ-ray irradiation process of the multi-core flat insulated electric wire 10, and 16 shows an irradiation crosslinking apparatus. In the present invention, since the occurrence of blocking is suppressed, it is possible to irradiate γ rays with the multi-core flat insulated wire 10 wound around the reel 15. The irradiation dose of this irradiation crosslinking is desirably 20 to 200 kGy, and if it is less than 20 kGy, it is not sufficient to suppress heat deformation, and if it exceeds 200 kGy, it becomes too hard. When the covering material 12 becomes too hard, the mountability such as terminal connection is deteriorated. An electron beam other than γ rays may be used for irradiation crosslinking.

  The multi-core flat insulated wire 10 is subjected to terminal processing after being cross-linked by γ-ray irradiation. FIG. 5 and FIG. 6 show examples of other molded shapes and terminal processed shapes of the multi-core flat insulated wire 10.

  FIG. 5A shows a flat multi-core flat insulated wire 101 on one side (the lower side in the figure). The multi-core flat insulated wire 101 can fix the wiring by applying an adhesive to the flat surface 20 and bonding and fixing it to a wall surface or the like in the wiring device. Further, by providing the notches 21 in the connecting portions of the conductor coatings, the conductors can be easily separated by the notches 21.

  FIG. 5 (B) shows the terminal processing shape of the multi-core flat insulated wire 101 of FIG. 5 (A), and the connection conductor 22 is formed by removing the covering material 121 at the end. Depending on the connection form, it can be separated into single-core insulated wires using the cuts 21 and the conductor spacing can be increased to facilitate electrical connection such as solder connection.

  FIG. 6A shows a multi-core flat insulated electric wire 102 in which the covering of each conductor is integrated with a connecting portion 23 that can be easily separated. Both ends of the connecting portion 23 are provided with cuts 24 that are easy to cut. By cutting the connecting portion 23, a single-core insulated wire can be obtained. Although it is the same as that of FIG. 5 (A) in that it can be separated into single-core insulated wires, it is suitable when the conductor arrangement pitch is large, and is suitable for the press contact terminal connection shown in FIG. 6 (C).

  FIG. 6B shows a terminal processing shape of the multi-core flat insulated wire 102 of FIG. The connecting portion 23 at the end is partially removed in a U-shape as indicated by 25 to form a connection piece 26 with the end covered. As shown in FIG. 6 (C), the connecting piece 26 is inserted into a well-known press contact terminal 27 frequently used for electrical connection from the direction of the arrow, so that the covering material 122 is automatically pierced. An electrical connection is formed.

  As described above, in this embodiment, terminal processing is performed after γ-ray irradiation. However, since the multi-core flat insulated wire 10 according to the present invention is excellent in handling at the time of manufacture, the terminal processing is performed before or after γ-ray irradiation. Can be manufactured well.

Next, the multi-core flat insulated wire according to the present invention will be described in more specific examples.
By the manufacturing method demonstrated above, the flat insulated wire (Examples 1-6, Comparative Examples 1-3) was created with the mixing | blending shown in following Table 1. FIG. In the following formulation, “%” is based on weight.

Evaluation Method (1) Flame Retardancy Test A flame retardant test was conducted by conducting a VW-1 test (UL1581 standard).
(2) Blocking measurement After pressing the sheets at 50 ° C. for 5 minutes in the state of the sheets, a 180-degree peel test was performed to measure the adhesion.
(3) Terminal workability As shown in FIG. 7, the covering material 12 of the prepared multi-core flat insulated wire 10 is peeled off to make a clue, and the conductor 11 is grasped and pulled out a little. Next, the portion on the opposite side of the multi-core flat insulated wire 10 in which the conductor 11 protrudes and becomes only the covering material 12 is fixed by the chuck 17. And the part which became only the said conductor 11 was grasped, it pulled in the direction pulled out from the coating | covering material 12, and the conductor extraction force at that time was measured. In this embodiment, the conductor pulling force is measured in a single core state as shown in FIG. 7, but it may be measured in a multi-core state without being separated into one core.

  The multi-core flat insulated wires (Examples 1 to 5) created using the molding resin composition according to the present invention cleared the VW-1 test (UL1581 standard). In the blocking measurement, the adhesion was as good as ≦ 30 g / 25 mm, and no blocking occurred even when the uncrosslinked electric wire wound on the reel was crosslinked and cured by γ-ray irradiation. Also, in terms of terminal workability, the conductor pulling force was ≦ 1.0 kg / core, and no residue was generated.

  Since the multi-core flat insulated wire of Example 6 was produced using the molding resin composition according to the present invention, it was excellent in flame retardancy and blocking properties, but because it contains a silane coupling agent, terminal processability is poor. As a result.

  In Comparative Example 1, the flame retardancy was NG because the VA content was too low.

  Since Comparative Example 2 did not contain a fatty acid amide, the blocking property was poor. On the other hand, Comparative Example 3 was inferior in flame retardancy because the fatty acid amide content was too high.

It is the schematic which shows an example of the multi-core flat insulated wire of this invention. It is the schematic which shows an example of the lamination process of the multi-core flat insulated wire of this invention. It is the schematic which shows an example of the shaping | molding roller of the multi-core flat insulated wire of this invention, and a covering molding state. It is the schematic which shows an example of the gamma ray irradiation process of the multi-core flat insulated wire of this invention. It is a figure which shows an example of the shaping | molding shape and terminal processing shape of the multi-core flat insulated wire of this invention. It is a figure which shows an example of the shaping | molding shape and terminal processing shape of the multi-core flat insulated wire of this invention. It is the schematic which shows the measuring method of the conductor extraction force performed in the Example.

Explanation of symbols

10 (101, 102) ··· Multi-core flat insulated wire, 11 · · Conductor, 12 (121, 122) · · Coating material, 12a · · Coating tape, 14 · · Forming roller, 16 · · Irradiation crosslinking device.

Claims (4)

A flame retardant multi-core flat insulated wire that does not contain halogen compounds,
The insulating coating is formed by crosslinking a molding resin composition containing an ethylene vinyl acetate copolymer, a fatty acid amide, and a metal hydroxide,
In the molding resin composition, the content of fatty acid amide is 1 to 4% by weight, and the total amount of vinyl acetate is 40 to 70% by weight with respect to the total amount of ethylene vinyl acetate copolymer, Multi-core flat insulated wire.   The multi-core flat insulated wire according to claim 1, wherein the molding resin composition does not contain a silane coupling agent. A method for producing a flame retardant multi-core flat insulated wire not containing a halogen compound,
It contains an ethylene vinyl acetate copolymer, a fatty acid amide, and a metal hydroxide, and the content of the fatty acid amide is 1 to 4% by weight, and the total amount of vinyl acetate is 40 with respect to the total amount of the ethylene vinyl acetate copolymer. A molding resin composition of ~ 70% by weight is extruded to form a coated tape,
Subsequently, a plurality of conductors arranged in parallel at a predetermined interval are sandwiched between the coating tapes from both sides and laminated by a molding roller, and pressure-molded to form an insulating coating,
Then, the manufacturing method of the multi-core flat insulated wire characterized by bridge | crosslinking the said insulation coating.   The multi-core flat insulated electric wire according to claim 3, wherein the multi-core flat insulated electric wire is cut into a predetermined length before or after cross-linking, and both ends are processed so as to be connectable to press contact terminals. Manufacturing method.

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