JPS6280914A - Fluorine containing elastomer-coated 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 [Industrial Field of Application] The present invention relates to an electric wire having an insulating coating made of a tetrafluoroethylene-propylene copolymer.

[Prior Art] Tetrafluoroethylene-propylene copolymer is known as a fluorine-containing elastomer copolymer that has high thermal stability, oil resistance, insulation, chemical resistance, and flame retardancy and can be used for beam construction. By coating the outer periphery of a conductor or wire core with such a copolymer, it is possible to obtain wires and cables having the above-mentioned features, and this is currently being studied in various fields.

[Problems to be Solved by the Invention] However, when a resin composition containing a tetrafluoroethylene-propylene copolymer as a main component is heated,
A new problem has been recognized: the insulated wire adheres strongly to the tin-plated copper wire normally used as a conductor, making it extremely difficult to peel off the end of the insulated wire.

This poses a major problem when an insulated wire coated with a resin composition containing a tetrafluoroethylene-propylene copolymer as a main component is used as a sunrise wire for a motor or the like.

That is, the tin-plated copper wire and the insulation coating adhere to each other due to heating after varnish treatment (usually at around 150° C. for 10-odd hours), resulting in a situation where the end cannot be peeled off using a wire stripper.

The present invention provides a fluorine-containing elastomer-coated electric wire whose insulation coating is made of a resin composition mainly composed of a tetrafluoroethylene-propylene copolymer, which allows easy separation of the copper wire and the insulation coating even after heating. This is the purpose.

[Means for solving the problems] The electric wire of the present invention uses a copper wire whose surface is coated with metal soap, and a resin composition containing a tetrafluoroethylene-propylene copolymer as a main component on the outer periphery of the copper wire. It is constructed by providing a coating layer of.

In the present invention, the tetrafluoroethylene-propylene copolymer includes, in addition to the main components tetrafluoroethylene and propylene, components copolymerizable with these, such as ethylene, butene-1, isobutyne, acrylic acid, and alkyl thereof. esters, methacrylic acid and its alkyl esters, vinyl buttonide, vinylidene buttonide, hexafluoropropene, chloroethyl vinyl ether,
It may contain glycidyl vinyl ether, chlorotrifluoroethylene, perfluoroalkyl vinyl ether, etc. as appropriate.

In such a copolymer, the molar ratio of tetrafluoroethylene/propylene is 9515 to 30/70,
In particular, it is preferable to select from the range of 90/10 to 45155 from the viewpoint of heat resistance, moldability, etc., and the content of components other than the main component, which may be added as appropriate, is usually 50 mol%.
Hereinafter, it is particularly preferable to select from a range of 30 mol% or less.

The resin composition containing the above-described tetrafluoroethylene-propylene copolymer as an essential component is extruded and coated on the outer periphery of a copper wire whose surface is coated with metal soap, and then crosslinked.

The crosslinking method is not particularly limited, and may be chemical crosslinking by adding organic peroxides or amines, or irradiation crosslinking by irradiation with ionizing radiation such as gamma rays or electron beams.

Specific examples of organic peroxides include di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di(t-
butylperoxy)-hexine-3,1,3-bis-(
Examples include t-butylperoxy-isopropyl)benzene.

Specific examples of amines include hexamethylene diamine,
Examples include so-called alkyl polyamines such as tetraethylenepentamine and triethylenetetramine, their salts such as carbamic acid and cinnamylidenic acid, and aromatic polyamines such as piperazine, piperidine, pyridine, aniline, and phenanthroline, and their salts.

It is also possible to employ crosslinking aids such as allyl compounds, sulfur, organic amines, maleimide, methacrylates, divinyl compounds, etc. Preferably, diallyl phthalate, triallyl phosphoric acid, triallyl isocyanurate, triallyl cyanurate, etc. Allyl compounds can be employed.

In the present invention, various additives such as fillers such as talc, clay, and silicic anhydride, reinforcing agents, pigments, lubricants, extrusion aids, antioxidants, and stabilizers may be added in addition to the above-mentioned components.

Further, ethylene copolymers such as ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer, resins such as chlorinated polyethylene, chlorosulfonated polyethylene, and acrylic rubber may be mixed.

The metal soap applied to the surface of the steel wire is a compound of a metal and an acid such as fatty acid, resin acid, or naphthenic acid.

Specifically, calcium stearate, magnesium stearate, barium stearate, lead stearate,
Examples include zinc stearate, barium ricinoleate, zinc laurate, and zinc naphthenate.

[Example] 100 parts by weight of tetrafluoroethylene-propylene copolymer (number average molecular weight 50,000, molar ratio of tetrafluoroethylene/propylene lentilol = 55/46) oxy-isopropyl)benzene IXm parts ○ Triallyl isocyanate 5 parts by weight ○ Thermal carbon
40 parts by weight ○ 1 part by weight of sodium stearate was kneaded with a 150 mm diameter rubber roll set at a temperature of 50 to 60°C to obtain a Mouni viscosity M L l + 4 (100°C
) was obtained.

As shown in Table 1, this resin composition was extruded and coated to a thickness of 0.5 mm on the outer periphery of a tin-plated copper stranded wire with an outer diameter of 1.6 ffIIIφ coated with various mold release agents, and then heated at 13 atm. Crosslinking was achieved by holding in steam for 3 minutes.

Regarding the electric wire produced in this way, whether it is possible to peel off the end with a wire stripper (Hatsutomo and 200℃ at 150℃)
Table 1 shows the results of the evaluation (after heating for a period of time).

Table 1 As is clear from Table 1, when copper wires coated with metal soap are used as in Nos. 001 to 5, peeling is possible even after heat treatment, whereas on the other hand, as in Nos. 006, no copper wires are coated. If not and no.

When a mold release agent different from metal soap was applied as in Examples 7 to 10, peeling after heat treatment was impossible.

[Effects of the Invention] As explained above, according to the present invention, it is possible to easily peel off the ends of an insulating coating made of copper wire and a resin composition mainly composed of a tetrafluoroethylene-propylene copolymer after heat treatment. It becomes possible to realize a fluorine-containing elastomer-coated electric wire that can

Claims (2)

[Claims] (1) A coating layer of a resin composition containing a tetrafluoroethylene-propylene copolymer as a main component is formed on the outer periphery of a copper wire whose surface is coated with metal soap, and the coating layer is crosslinked. A fluorine-containing elastomer coated electric wire characterized by: (2) The fluorine-containing elastomer-coated electric wire according to claim 1, wherein the metal soap is a compound of a metal and an acid selected from stearic acid, lauric acid, and ricinoleic acid.