JPH08283501A - Polyvinyl chloride resin composition for coating electric wires - Google Patents

Abstract

(57) [Summary] [Structure] (a) Polyvinyl chloride 100 parts by weight, (b) Plasticizer 10 to 100 parts by weight, (c) Lubricant 0.5 to 5 parts by weight, (d) Heat stabilizer 1 to 20 parts by weight, (e) a crosslinking aid 1 to 10 parts by weight,
And (f) a chelate-forming compound, a polyvinyl chloride resin composition for wire coating of wire harness, which comprises 0.1 to 1 part by weight. [Effect] According to the electric wire coated with the composition of the present invention, a large welding strength can be obtained even under mild welding conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyvinyl chloride composition for use in coating a wire harness wire and a wire harness wire.

[0002]

2. Description of the Related Art Electron-beam irradiation cross-linked heat-resistant vinyl electric wire
Abbreviated as VX electric wire. ) Is an electric wire excellent in heat resistance, cold resistance, and wear resistance, which is composed of a coating material made of a heat-resistant polyvinyl chloride resin composition cross-linked by electron beam irradiation as an annealed copper wire as a conductor. When using in a wire harness, A
The VX electric wire is electrically connected by using a crimp terminal after removing the coating on the end portion and the intermediate portion to be connected. In recent years, techniques such as ultrasonic welding and resistance welding have been studied as a highly reliable connection method instead of crimping. In these weldings, since the electric wire conductor, which is the material to be welded, has low material strength, it is necessary to effectively bond the metal interfaces to each other without causing damage. Therefore, ultrasonic welding is frequently used for these joinings, and a method of controlling the welding conditions so that the conductor is not completely melted even when resistance welding is performed to obtain metal joining on the surface is used. However, according to the welding method under such mild conditions, the conventional A
It was not possible to obtain sufficient welding strength with the VX electric wire.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an AVX electric wire which gives a large adhesive strength even when the AVX electric wire used in a wire harness is connected under mild conditions such as ultrasonic welding and resistance welding. It is intended.

[0004]

In order to achieve the above object, the inventors of the present invention have made intensive studies focusing on the relationship between the composition of the coating of the electric wire and the welding strength of the connecting portion of the electric wire for wire harness. . As a result, surprisingly, there is a correlation between the composition of the coating and the welding strength, and the addition of a chelate-forming compound capable of forming a chelate compound with copper to the coating polyvinyl chloride composition. It was found that the above problems can be solved by the above. Therefore, the present invention comprises (a) 100 parts by weight of polyvinyl chloride, (b) 10 to 100 parts by weight of a plasticizer, (c) 0.5 to 5 parts by weight of a lubricant, (d) 1 to 20 parts by weight of a heat stabilizer, (e) 1 to 10 parts by weight of a crosslinking aid,
And (f) a chelate-forming compound. A gist of a polyvinyl chloride resin composition for wire coating of a wire harness, which comprises 0.1 to 1 part by weight. The gist of the present invention is also an electric wire for a wire harness, which is obtained by coating a conductive wire with the above-mentioned cured composition. The present invention will be described in detail below.

The polyvinyl chloride used as the base resin in the composition of the present invention is not limited because any of the conventionally known polyvinyl chloride for electric wires can be used. The degree of polymerization is preferably 800 to 3,800, more preferably 1,
It is 300-2,400.

As the plasticizer used in the present invention, any known plasticizer for polyvinyl chloride can be used without limitation, but phthalic acid derivatives, isophthalic acid derivatives, tetrahydrophthalic acid derivatives, adipic acid derivatives,
Ester compounds such as trimellitic acid derivatives and pyromellitic acid derivatives, polyester compounds, paraffin derivatives,
Examples thereof include epoxy derivatives and vegetable oil derivatives. Of these, phthalic acid ester, trimellitic acid ester, and pyromellitic acid ester are preferable. Plasticizer is polyvinyl chloride 1
10 to 100 parts by weight, preferably 3 to 100 parts by weight
Used in 0 to 50 parts by weight.

Lubricants used in the composition of the present invention include metallic soap, paraffin, fatty acids, fatty acid amides, fatty acid esters, and fatty alcohols. A stearic acid compound is preferred. The lubricant is used in an amount of 0.5 to 5 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of polyvinyl chloride.

Examples of heat stabilizers include metallic soaps, inorganic acid salts, and organic tin compounds. Lead acid basic compounds such as tribasic lead sulfate are preferred. The heat stabilizer is 1 to 20 parts by weight, preferably 5 to 100 parts by weight of polyvinyl chloride.
Use 15 parts by weight.

The cross-linking aid is a compound having at least one ethylenically unsaturated double bond, prevents the cleavage of PVC during electron beam irradiation, and further prevents the chemical bond between the main chains of PVC and the main chain. Refers to a compound for forming a bond. Examples of the crosslinking aid include a methacrylate compound, an acrylate compound, and an isocyanurate compound. Polyhydric alcohol methacrylates such as trimethylolpropane trimethacrylate are preferred. The crosslinking aid is used in an amount of 1 to 10 parts by weight, preferably 3 to 8 parts by weight, based on 100 parts by weight of the polyvinyl chloride resin.

The chelate-forming compound used in the composition of the present invention is a compound capable of forming a chelate compound with copper. As the chelate compound, 1,2,3-benzotriazole, 3- (N-salicyloyl) amino-
1,2,4-triazole, 1,2,3-benzotriazo-
Sodium salt, tolyltriazole, tolyltriazole amine salt, tolyltriazole potassium salt, triazine derivative complex, decamethylenedicarboxylic acid disalicyloyl hydrazide, N, N'-bis [3-3,5-di-
Examples include compounds such as tert-butyl-4-hydroxyphenyl) propionyl] hydrazine, acid / amine derivatives, and combinations thereof, which react rapidly with copper, but the reaction product does not inhibit welding. Of these, 3- (N-salicyloyl) amino-1,2,4-triazole is preferable.
The chelate-forming compound is 0.1 to 1 part by weight, preferably 0.1 to 0.1 part by weight, based on 100 parts by weight of the polyvinyl chloride compound.
Use 5 parts by weight.

In addition to the above components, the composition of the present invention may optionally contain additives typically used for electric wire coating compositions such as pigments, flame retardants and antistatic agents.

Next, a method for preparing the composition of the present invention will be described. After dry blending all the measured materials with a Henschel mixer, etc., uniformly mix them using a closed mixer such as a kneader and a continuous mixer such as an extrusion granulator or a twin screw extruder.
Granulate after kneading. The dry blend can be omitted.

The conductor wire is then coated with the composition prepared as described above. As the conducting wire, a single wire or a plurality of twisted annealed copper wires is used.
Extrude the coating material on the wire at 0-210 ° C.

The coated wire is then crosslinked by irradiating it with an accelerated electron beam at 5 to 20 MRad at a temperature of 0 to 50 ° C. using an electron beam irradiation device.

The electric wires of the present invention are connected as follows. Cover the end or middle of two or more wires with 10
After removing ~ 20 mm, the conductors are welded using an ultrasonic welding machine or a resistance welding machine.

[0016]

【Example】

Examples 1 to 6 and Comparative Example 1 A mixture having the composition shown in Table 1 was heated at a temperature of 1 using a pressure kneader.
Knead at 70 ° C, pressure 7 kgf / cm ² for 0.5 hours, then granulator
(FR65, manufactured by Moriyama Seisakusho) was used for granulation. Next, using an extruder (D2-0162, manufactured by Omiya Seiki), the resin temperature 1
Wire diameter 0.18 at 90 ° C and linear velocity of 300 m / min
mm, a conductor wire composed of 19 wires (nominal 0.5 mm ² ) was coated. The obtained electric wire was used as an electron beam irradiation device (950 KV-6
5 mA, made by Nisshin High Voltage) at room temperature 9
An electric wire was obtained by irradiating MRad with an electron beam to crosslink and harden the coated portion. For comparison, a conventional typical coating material composition was used to coat a conductive wire and irradiate an electron beam under the same conditions to obtain an electric wire. The electric wire obtained in the performance evaluation was cut into 100 mm, and the coating on one end was removed by 15 mm (Fig. 1 (a)). Then, the coating on the two electric wires thus obtained was removed. Using the ultrasonic welding machine, pressurizing force: 32 psi, amplitude: 3
Ultrasonic welding was performed at 3.3 μm and energy: 133 J (FIG. 1 (b)). Then, the ultrasonically welded electric wire thus obtained was subjected to a crosshead speed of 100 mm using a tensile tester.
A tensile test was performed at 1 / min to measure the welding strength. The measurement is 1
Performed on 0 samples. The results are shown in Table 1 as the maximum, minimum and average values of welding strength.

[0017]

[Table 1]

As is apparent from the table, the electric wire using the conventional coating composition does not have sufficient welding strength and has a large variation. On the other hand, in the electric wire using the composition of the present invention, the average value is about 25 N and the variation is as small as ± 5,

[0019]

According to the electric wire coated with the composition of the present invention, a large welding strength can be obtained even under mild welding conditions.

[Brief description of drawings]

1A shows an electric wire before welding used in a welding strength test, and FIG. 1B shows an electric wire after welding.

FIG. 2 shows a welding strength measuring method.

[Explanation of symbols]

 1 Cover part 2 Conductor part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location C08K 5/05 KGT C08K 5/05 KGT 5/10 5/10 5/103 KGY 5/103 KGY 5 / 15 KHC 5/15 KHC 5/20 KHF 5/20 KHF 5/25 KHH 5/25 KHH 5/3477 KHL 5/3477 KHL 5/57 KJB 5/57 KJB H01B 7/00 301 H01B 7/00 301 7 / 34 7/34 A // (C08L 27/06 67:00 91:00) (72) Inventor Yasushi Ito 1-14 Nishisuehiro-cho, Yokkaichi-shi, Mie Sumitomo Wiring Systems, Ltd.

Claims (7)

[Claims] 1. (a) 100 parts by weight of polyvinyl chloride, (b) 10 to 100 parts by weight of plasticizer, (c) 0.5 to 5 parts by weight of lubricant, (d) 1 to 20 parts by weight of heat stabilizer, (e) 1 to 10 parts by weight of a crosslinking aid,
And (f) a chelate-forming compound, a polyvinyl chloride resin composition for wire coating of wire harness, which comprises 0.1 to 1 part by weight. 2. The plasticizer is an ester compound such as phthalic acid derivative, isophthalic acid derivative, tetrahydrophthalic acid derivative, adipic acid derivative, trimellitic acid derivative, pyromellitic acid derivative, polyester compound, paraffin derivative, epoxy derivative and vegetable oil. The composition according to claim 1, which is one or more compounds selected from the group consisting of derivatives. 3. The composition according to claim 1, wherein the lubricant is one or more compounds selected from the group consisting of metallic soap, paraffin, fatty acids, fatty acid amides, fatty acid esters and fatty alcohols. 4. The composition according to claim 1, wherein the heat stabilizer is one or more compounds selected from the group consisting of metal soaps, inorganic acid salts and organic tin compounds. 5. The composition according to claim 1, wherein the cross-linking aid is one or more compounds selected from the group consisting of methacrylate compounds, acrylate compounds and isocyanurate compounds. 6. The compound according to claim 1, wherein the chelate-forming compound is one or more compounds selected from the group consisting of benzotriazole compounds, triazine compounds, hydrazide compounds and acid-amine derivatives. 7. A wire harness electric wire obtained by coating a conductor with the composition according to claim 1 which is crosslinked by electron beam irradiation.