JPS61171006A - Insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 1 The present invention relates to an insulated wire coated with a styrenic entomer composition.

[Prior art J] A composition mainly composed of 5-B-S polymer, which is a type of styrene-based elastomer (S is polystyrene, B is a polymer obtained by adding hydrogen to polyisoprene or polybutadiene to crush unsaturated parts) Insulated NW, which is made by covering the outer periphery of a conductor, has excellent workability like conventional plastic-coated insulated wires, exhibits the properties of rubber-coated insulated wires without crosslinking, and has excellent electrical insulation and toughness. It is in the spotlight because of its

In conventional compositions, mineral oil-based process oil is generally blended with polyacid as a softener in order to provide extrusion processability and flexibility, and the process oil deteriorates due to oxidation at high temperatures. This leads to oxidative deterioration of the polymer as well.

Therefore, an insulated wire using such a composition as an insulator has insufficient heat aging resistance and cannot be used in applications requiring heat resistance.

[Problems to be Solved by the Invention] The present invention has been made based on the above, and aims to provide a styrene-based elastomer-coated insulated wire with improved heat aging resistance.

Means for solving the L problem] The insulated wire of the present invention is made of (a) S-B-S block copolymer (S is polystyrene, B is polyisoprene or polybutadiene with hydrogen added to it to destroy unsaturated parts) polymer), (b) polyolefin polymer, (c) softener,
(d) contains at least one fatty acid metal salt selected from Liff1, Ca salt, Na salt, and He1 salt of stearic acid or hydroxystearic acid, and (a) component/(b
) component is 30/70 to 70/30 by weight, (c
An insulator made of a resin composition containing component (d) at 0.5 to 10% by weight of component (c), based on 100 parts by weight of the total amount of components (a) and (b), It is characterized by being provided on the outer periphery of the conductor.

In the present invention, S in the 5-B-8 block copolymer of component (a) is a polystyrene block, and B is a polymer block obtained by adding hydrogen to polyisoprene or polybutadiene to destroy unsaturated parts. When hydrogen is added to polyisoprene, B becomes an ethylene-butene-1 copolymer or an analog thereof, and when hydrogen is added to polybutadiene, B becomes an ethylene-propylene copolymer or an analog thereof. The average molecular group of S is i, ooo~
200,000 preferably 5,000-500.00
0, preferably 10,000 to 300,000.

The content ratio (weight%) of S/B is 5/95 to 55/45,
Preferably it is 10/90 to 30/70.

(1)) The polyolefin polymer which is the component is the above-mentioned S-
This is necessary for imparting extrusion processability and heat deformation resistance to the 8-S block copolymer.

Among polyolefin polymers, polyethylene,
Crystalline polyolefins such as polypropylene, polybutene-1, and poly4-methylpentene-1 are preferred.
As the softening agent, which is component I(c), mineral oil-based process oils such as paraffin oil, naphthenic oil, and aromatic oils are typical.

(d) Ingredient stearic acid or todro4cystea'
) M(1)' At least one kind of fatty acid metal salt selected from Li salt, Ca salt, Na salt, and Alm, softening agent, and especially prevents oxidative deterioration of process oils such as paraffin oil, naphthenic oil, and aromatic oil. It prevents heat aging and improves heat aging properties.

The blend m of components (a) to (d) must be in the range of 30/70 parts by weight to 70/30 parts by weight of (a) / (b), and there is too much mackerel in component (b). The inherent flexibility of component (a) is impaired, and if too small, extrusion processability and heat deformation resistance will be reduced.

Component (c) is the sum of component (a) and component (b)! ti1
It is necessary to mix 30 parts by weight or more with respect to 00 parts by weight, and if it is less than this, sufficient extrusion processability and flexibility cannot be obtained.

The amount of component (d) is in the range of 0.5 to 10% by weight of component (c); if it is too small, the heat aging resistance cannot be improved, and if it is added in excess of 10% by weight, dispersion in the insulator will be poor.

In the present invention, in addition to the above ingredients, fillers, lubricants,
Antioxidants, metal deterioration inhibitors, colorants, flame retardants, flame retardant aids, etc. may be added as necessary.

Fillers include carbon black, calcium carbonate,
Examples include magnesium silicate and aluminum silicate.

Flame retardants include metal hydroxides such as aluminum hydroxide and magnesium hydroxide, perchlorocyclopentadecane,
Examples include halogen compounds such as decabromodiphenyl ether, ethylene bistetrabromphthalimide, chlorinated paraffin, and chlorinated polyethylene.

Examples of flame retardant aids include antimony compounds typified by antimony trioxide, zirconium compounds typified by zinc borate, and the like.

[Example] The formulations shown in Table 1 were kneaded in a Banbury kneader, and then introduced into an extruder to insulate the outer periphery of a copper wire with a cross-sectional area of 2 feet 2 to a thickness of 1.2 am. Created an electric wire.

The evaluation bundles of insulated wires prepared based on each individual formulation are shown in the lower column of Table 1.

In addition, heat aging resistance was determined by comparing a 111n thick sheet with the same composition to 15%.
After thermally deteriorating at 8° C. for 7 days, a tensile test was conducted at a speed of 500 m/min, and those with a tensile strength retention of 70% or more and an elongation retention of 65% or more were considered to have passed.

Flexibility was evaluated as good if the wire was bent 180° and the part did not become cloudy.

The dispersibility of the +d) component was determined by observing the insulator with a microscope.

Extrusion processability was judged from the roughness of the surface of the obtained electric wire.

Heat deformation resistance was determined by creating two thick sheets with the same composition, and
The sample was placed in a heating deformation tester at 21° C., and the change in thickness (ml) when a load of 2 kg was placed on it was judged, and those within a range of 20% or less were considered to have passed.

As is clear from Table 1, Example 1 within the scope of the present invention
~6, which is excellent in various properties including heat aging resistance.

Comparative Example 1 does not contain a fatty acid metal salt and has poor heat aging resistance.

In Comparative Example 2.3, the blending ratio of 5-B-8 block copolymer and polypropylene was outside the specified value of the present invention.
Each of them is inferior in flexibility, extrusion processability, or heat deformation resistance.

In Comparative Example 4, the amount of paraffin-based process oil as a softener was less than the specified value of the present invention, and the flexibility and
Poor extrusion processability.

In Comparative Examples 5 and 6, the amount of fatty acid metal salt added was outside the specified value of the present invention, in Comparative Example 5, which had a small amount, the heat aging resistance was poor, and in Comparative Example 6, which had too much, poor dispersion occurred.

"Effects of the Invention" As explained above, the present invention provides an insulated wire using a resin composition containing a 5-B-S block copolymer, a polyolefin polymer, a softener, and a specific fatty acid metal salt as an insulator. This makes it possible to realize an insulated wire with excellent heat aging resistance, flexibility, extrusion processability, heat deformation resistance, and dispersibility.

Claims (1)

[Claims] (1) (a) S-B-S block copolymer (S is polystyrene, B is a polymer obtained by adding hydrogen to polyisoprene or polybutadiene to crush unsaturated parts), (b) polyolefin polymer, (c) softening (d) contains at least one fatty acid metal salt selected from Li salt, Ca salt, Na salt, and Al salt of stearic acid or hydroxystearic acid, and component (a)/component (b) is in a weight ratio. 3
0/70 to 70/30, component (c) is 30 parts by weight or more based on 100 parts by weight of the total amount of components (a) and (b), and component (d) is 0.5 of component (c). An insulated wire characterized in that an insulator made of a resin composition containing up to 10% by weight is provided on the outer periphery of the conductor.