JP2001110241A - Wire harness - Google Patents

Abstract

(57) [Summary] [Problem] To ensure flame retardancy when mounted on a vehicle body (at the time of actual use), and in the burning process at the time of disposal, the covering material of the electric wire and the corrugated tube burn without generating harmful gas. The present invention provides a configuration in which the workability of inserting an electric wire is also improved. SOLUTION: A bundle of electric wires whose outer periphery is coated with a resin containing no halogen is covered with a corrugated tube made of a resin composition containing no halogen and containing an organic flame retardant. I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness which has excellent flame retardancy and does not generate harmful halogen gas during combustion.

[0002]

2. Description of the Related Art Conventionally, in wire harnesses used for automobiles and the like, generally, a halogen-based polymer such as PVC (polyvinyl chloride) or a olefin-based resin containing a halogen-based flame retardant as a coating material for electric wires. The resin material is used to prevent the covering material from burning even if an abnormality occurs in the electric wire. On the other hand, a non-flame-retardant resin material such as polypropylene, which does not usually contain halogen, is used for the corrugated tube sheathed on the wire bundle.

[0003] In recent years, from the point of resource saving, when the body is discarded,
Burning the corrugated tube and the wires that are sheathed in the wire covering material and wire bundle, and taking out the copper that is the wire material,
We try to recycle copper. Although the covering material of the electric wire is flame-retardant as described above, the burning temperature at the time of disposing of the vehicle body is increased to 800 ° C., so that the covering material of the electric wire can be burned together with the non-flammable corrugated tube.

[0004]

When the conventional wire harness is discarded, the harmful halogen gas is generated in a relatively large amount by the burning of the covering material of the electric wire containing the halogen, which may cause environmental pollution. There is. for that reason,
Attempts have been made to incorporate an inorganic flame retardant such as aluminum hydroxide or calcium hydroxide in place of halogen in the covering material of electric wires, but the flame retardancy of the inorganic flame retardant is low, so the flame retardant required by the market In order to satisfy the property, it is necessary to mix a large amount of the inorganic flame retardant, and as a result, there is a problem that the abrasion resistance, cold resistance, bending resistance, etc. of the coating material are deteriorated. In order to solve the problem, a structure in which a non-halogen-based material that does not contain a flame retardant is coated on an electric wire, and the electric wire is covered with a non-halogen resin composition containing an inorganic flame retardant to cover the flame retardancy. Has been proposed. The bending properties of a material with high rigidity containing a large amount of inorganic flame retardant were improved by the shape of the corrugate, but the workability of inserting the electric wire into the slit of the corrugate was poor due to the high rigidity,
There was a problem that production efficiency fell.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and ensures flame retardancy when mounted on a vehicle body (at the time of actual use). In a wire harness in which a tube burns without generating harmful gas, an object is to provide a configuration in which the workability of inserting an electric wire is also improved.

[0006]

According to the present invention, a bundle of electric wires whose outer periphery is coated with a resin containing no halogen is made of a resin composition containing no halogen and containing an organic flame retardant. The present invention relates to a wire harness which is provided with a corrugated tube.

[0007] In the wire harness having the above structure, since neither the covering material of each electric wire nor the corrugated tube sheathed on the electric wire bundle contains halogen, even if these are burned when the wire harness is discarded, harmful halogen gas is generated. Will not occur.

Further, when the wire is actually used (when mounted on the vehicle body), even if an abnormality occurs in the wire, the wire harness burns because the wire is covered with a highly flame-retardant corrugated tube containing an organic flame retardant. Never.

Further, since the covering material of the electric wire does not contain an organic flame retardant, it does not deteriorate in abrasion resistance, cold resistance, bending resistance and the like, and shows good electric wire protection performance. In addition, since the rigidity (hardness) is moderate, the workability of the electric wire at the time of assembling the wire harness is improved, and the productivity is improved. On the other hand, corrugated tubes show a tendency to slightly deteriorate abrasion resistance, cold resistance, bending resistance, etc. due to the compounding of the organic flame retardant, but the corrugated tubes do not directly contact the wires, and the wires covered with the coating material It is a bellows shape that has irregularities that are continuous in the longitudinal direction and is easily bent and deformed, so that it has the same protection performance as a conventional corrugated tube that does not contain an organic flame retardant. Can be. Also, the addition of a small amount hardly increases the rigidity and does not impair the workability of inserting the electric wire through the slit of the corrugate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The corrugated tube of the present invention is a resin composition obtained by blending an organic flame retardant with a thermoplastic or thermosetting insulating resin conventionally used as a material of this type of corrugated tube. Molded into a corrugated tube can be used. It is preferable to use a polyamide resin as the insulating resin, and it is preferable to use a resin composition in which 0.1 to 20 parts by weight of an organic flame retardant is blended with respect to 100 parts by weight of the polyamide resin.

As the organic flame retardant, melamine cyanurate and / or ethylene dimamine dicyanurate are used.

As the covering material of the electric wire, an insulating resin having a certain degree of flexibility is preferable. For example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, ethylene-propylene copolymer Olefin resins such as polymers can be mentioned, and it is preferable to use one or more of these examples in combination. In particular, a mixture of polyethylene and an ethylene-vinyl acetate copolymer is preferable from the viewpoint of electric wire covering properties, bending resistance, and the like.

Further, in the covering material of the electric wire, for example, tetrakis- [methylene-3- (3 ', 5'-t-butyl-
4'-hydroxyphenyl) propionate] an antioxidant such as a hindered phenolic substance such as methane; an inorganic filler such as calcium carbonate, talc and clay; a metal salt of a fatty acid such as a metal salt of stearic acid; A metal deactivator such as 3-benzotriazole, an inorganic pigment such as titanium oxide, carbon black and graphite, and an organic pigment such as disazo yellow may be added according to a desired purpose. These additives are preferably used in an amount of about 1 to 10% by weight based on the whole coating material.

[0014]

EXAMPLE 1 A 0.3 mm thick resin layer made of a mixture of polyethylene and ethylene-vinyl acetate copolymer in a weight ratio of 7: 3 (polyethylene: ethylene-vinyl acetate copolymer) was applied to a copper wire. An electric wire was obtained by coating.

Next, a resin composition obtained by mixing and kneading 5 parts by weight of melamine cyanurate as an organic flame retardant with respect to 100 parts by weight of a polyamide resin and kneading the resulting mixture was extruded to obtain an outer diameter of 10 to 20 mm. 0.3 mm wall thickness, uneven pitch (interval between adjacent recesses (interval between protrusions))
Manufactured a corrugated tube having a cylindrical shape having a bellows of 3 to 5 mm and having slits.

The above-mentioned electric wire was wired in a predetermined form, and a corrugated tube was sheathed to obtain a wire harness. The wire insertion workability was good. The following tests were performed on the obtained wire harness. First, the electric wire was heated by energization to observe whether the wire harness burned. As a result of the observation, the covering material of the electric wire was burnt, but the corrugated tube did not burn at all, and the non-combustibility of the wire harness was confirmed.

Next, the above-mentioned wire harness is put into a furnace,
Burned at 800 ° C. The resin layer of the electric wire and the corrugated tube were burned and burned off, and only the copper wire of the electric wire could be taken out. No harmful gas was generated during this combustion.

Example 2 A wire harness was obtained in the same manner as in Example 1, except that ethylene dimelamine dicyanurate was used as the organic flame retardant. With respect to the obtained wire harness, when the electric wire was heated by energization, the covering material of the electric wire was burnt, but the corrugated tube did not burn at all.

Further, the above-mentioned wire harness is put in a furnace,
Burned at 800 ° C. The resin layer of the electric wire and the corrugated tube were burned and burned off, and only the copper wire of the electric wire could be taken out. No harmful gas was generated during this combustion.

[0020]

As is apparent from the above description, according to the wire harness of the present invention, non-flammability during normal use can be ensured, and further, no harmful gas is generated at the time of disposal. And the corrugated tube can be burned off. Further, the workability of inserting the electric wire is not impaired.

Claims (4)

[Claims] 1. A bundle of electric wires in which the outer periphery of a core wire is coated with a resin containing no halogen is covered with a corrugated tube made of a resin composition containing no halogen and containing an organic flame retardant. And wire harness. 2. The corrugated tube is made of polyamide resin 1.
The wire harness according to claim 1, wherein a resin composition is prepared by mixing 0.1 to 20 parts by weight of an organic flame retardant with respect to 00 parts by weight. 3. The wire harness according to claim 1, wherein the organic flame retardant is melamine cyanurate and / or ethylene dimamine dicyanurate. 4. The electric wire coating resin is a mixture of polyethylene and ethylene-vinyl acetate copolymer.
3. The wire harness according to 3.