JPH07238273A - Coating peeling agent for electric wire coated with ultraviolet ray irradiation cross-linked resin and method for peeling terminal coating of electric wire using the same - Google Patents

Abstract

PURPOSE:To obtain the subject peeling agent capable of readily peeling an insulating film of an insulated electric wire coated with an ultraviolet cross- linkable resin composition using an organic solvent containing a specific chlorine-based organic solvent. CONSTITUTION:An organic solvent, solvent is used >=50% or more of which is a chlorine-based organic solveas a peeling agent. Furthermore, the molecular weight of the solvent is preferably <= 200 and, e.g. methylene chloride is preferably used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated wire, and more particularly to a coating stripping agent for an ultraviolet irradiation cross-linking resin-coated electric wire using a UV cross-linking resin composition as a coating material, and a wire end coating stripping method using the same.

[0002]

2. Description of the Related Art As a method for producing an electric wire having a thin coating,
For example, a method of applying a liquid material and curing it is well known, as in the case of manufacturing an enameled wire.

As the liquid material, there are materials such as thermosetting type, ultraviolet curing type and electron beam curing type. Most of the enameled wires mentioned above use thermosetting type materials (thermosetting type varnish). Has been done. The thermosetting varnish includes epoxy type, silicone type, polyurethane type, polyester type, polyamide imide type, polyimide type, polyester imide type, and formal type. Among these, the enameled wire using the urethane-based thermosetting varnish is one of the characteristics that other enameled wires do not have, and is that it can be soldered as it is without peeling the coating and using no flux.

By the way, in recent years, with the miniaturization and weight reduction of computers, audios, automobiles, aircrafts, and artificial satellites, electric wires / cables used for these tend to be thin and thin. Generally, such a tendency is dealt with by thinning the coating of electric wires / cables.

As one of the countermeasures, there is an extrusion method. However, the thinning by the extrusion method has a drawback in that the thinner the coating, the more easily the strain caused by the temperature difference between the coating material and the conductor is affected, and the reduction in elongation is caused. For this reason, the conductor is preheated to prevent the above-mentioned drawbacks. On the other hand, however, if the conductor becomes thin, there is a drawback that the strength is lowered by preheating and that the wire is easily broken due to the pressure of the material at the time of extrusion.

On the other hand, the enamel wire has a small coating thickness and is very effective if it can be applied to such applications as an electric wire.
However, the coating of the enamel wire using the above-mentioned thermosetting material requires that the coating and baking process be repeated at least 5 times, and most of the materials are made up of 50% or more of the organic solvent. The need for extensive safety equipment,
There is a problem that coloring is not easy as with polyethylene and polyvinyl chloride because of baking, and that peelability is poor.

Therefore, what is drawing attention as a means for forming a thin film is a solvent-free and liquid ultraviolet cross-linking resin composition. This is used, for example, as a coating material for optical fibers, and among them, urethane acrylate-based materials are often used. This UV-crosslinking resin composition is cured by a method such as radical polymerization, ionic polymerization, or cationic polymerization utilizing ultraviolet rays, and in particular, a method by radical polymerization is known.

Since the above ultraviolet-crosslinking resin composition is in a liquid state, it can be easily coated with a thin wall and has a high curing rate, and has a great effect on productivity. Further, since it is solvent-free, it is more safe than the thermosetting varnish used for enameled wire, and an arbitrary film thickness can be obtained by coating once or several times. Furthermore, since it can be a colorless and transparent resin composition, it has an advantage that it is easier to be colored than a thermosetting varnish.

[0009]

By coating the above-mentioned UV-crosslinking resin composition on a conductor and irradiating it with UV rays to cure it, an insulated wire having a thin insulating coating can be easily obtained. However, a composition obtained by curing such a liquid resin composition by a polymerization cross-linking reaction is often accompanied by shrinkage at the time of polymerization, which causes a problem that the conductor is tightened and peeling of the end is difficult. In addition, when an oligomer, a monomer, or an additive having a structure in the resin, such as a hydroxyl group, which easily adheres to or adheres to a metal surface, is difficult to remove, the thinner the conductor, the more the wire stripper. There is a problem that the conductor is also cut off when peeled by such as.

The object of the present invention is to remove the insulating coating of an insulated electric wire coated with an ultraviolet-crosslinking resin composition, and a coating stripping agent for an ultraviolet-irradiated crosslinkable resin-coated electric wire and an electric wire terminal coating using the same. It is to provide a peeling method.

[0011]

In order to achieve the above object, the present invention uses an organic solvent in which 50% or more is a chlorine-based organic solvent as a release agent for removing the insulating coating of an ultraviolet-crosslinking resin-coated electric wire. It is characterized by having been. The molecular weight of the chlorine-based organic solvent is preferably 200 or less.

Further, in the electric wire terminal coating stripping method using the coating stripping agent for the ultraviolet irradiation cross-linked resin coated electric wire of the present invention, 50% or more of the end of the electric wire formed by coating the conductor with the ultraviolet cross-linking resin composition has a molecular weight of 50% or more. It is immersed in an organic solvent which is a chlorine-based organic solvent of 200 or less, and then the immersed insulating coating is peeled off.

[0013]

[Function] By using an organic solvent having a chlorine-based organic solvent of 50% or more as the coating stripping agent, the chlorine-based organic solvent acts to strip the ultraviolet-crosslinking resin composition, so that the insulation of the ultraviolet-crosslinking resin-coated wire is prevented. The coating can be easily peeled off. Further, by immersing the end of the UV-crosslinking resin-coated electric wire in a chlorine-based organic solvent or the like, the immersion part can be easily grasped and pulled out, so that the coating of the immersion part can be easily peeled off, and the terminal peeling process can be easily performed. .

The UV-crosslinking resin composition used in the present invention basically comprises a photopolymerizable oligomer, a photopolymerizable monomer, a photoinitiator and the like. The photopolymerizable oligomer (prepolymer) is, for example, epoxy acrylate type, epoxidized oil acrylate type, urethane acrylate type, polyester urethane acrylate type, polyether urethane acrylate type, polyester acrylate type, polyether acrylate type, vinyl acrylate type, Various oligomers such as silicone acrylate type, polybutadiene acrylate type, polystyrene ethyl methacrylate type, polycarbonate dicarbonate type, unsaturated polyester type, polyene / thiol type, and functional groups having unsaturated double bonds, such as acryloyl group and methacryloyl group. , Having two or more allyl groups and vinyl groups.
The oligomer may be fluorine-substituted, or two or more kinds of oligomers may be combined.

As the photopolymerizable monomer, a known compound having one or more functional groups such as acryloyl group, methacryloyl group, vinyl group and allyl group in the molecule can be used.

The photopolymerization initiator has a function of initiating a polymerization reaction of a photopolymerizable oligomer or monomer, and has a role of receiving a UV ray to generate a free radical. This free radical is necessary for ultraviolet crosslinking, and the photopolymerization initiator is a substance that easily absorbs a specific wavelength by irradiation with ultraviolet to be in an electronically excited state to generate a radical. For example, benzoin ether type, ketal type, acetophenone type,
There are benzophenone type, thioxanthone type, etc., and various photopolymerization initiators can be used according to the purpose.

In carrying out the present invention, the ultraviolet-crosslinking resin composition may optionally contain the following one or a combination of two or more kinds.

That is, photoinitiator aids, anti-adhesion agents, thixotropic agents, fillers, plasticizers, non-reactive polymers, colorants, flame retardants, flame retardant aids, softening inhibitors, mold release agents, desiccants. ，
A combination of dispersants, wetting agents, anti-settling agents, thickeners, antistatic agents, antistatic agents, antifungal agents, anti-mouse agents, anti-termite agents, matting agents, anti-blocking agents, anti-skin agents, etc. May be.

The chlorine-based organic solvent is not particularly limited, but examples thereof include ethyl chloride, ethylene chloride, methyl chloride, methylene chloride, ethylidene chloride, chloroform, trichloroethylene, trichloroethane, and methylchloroform. You may use these 1 type or in combination of 2 or more types.

The chlorine-based organic solvent may be used in combination with another organic solvent when it is necessary to adjust the concentration, and the ratio of the chlorine-based organic solvent at this time is 50% with respect to the non-chlorine-based organic solvent.
It is desirable to occupy the above. The reason for setting it to 50% or more is that if the ratio is lower than this, the peeling action is slow and it takes time.

The reason why the molecular weight of the chlorine-based organic solvent is 200 or less is that when the molecular weight is larger than 200, the peeling action of the ultraviolet-crosslinking resin composition is slow and it takes time. The lower limit is not particularly specified, but a chlorine-based organic solvent that is easily available has a molecular weight of 50 or more. Therefore, the chlorine-based organic solvent that can be used in the present invention has a molecular weight of 50 to 200, preferably a molecular weight of 50 to 150.

[0022]

EXAMPLES Examples of the present invention will be described below.

First, various insulated electric wires are prepared by coating a conductor with an ultraviolet-crosslinking resin composition as described below.

[Sample 1] Urethane acrylate oligomer U-122A 100 parts by weight, isobornyl acrylate 50
Parts by weight, and 7.5 parts by weight of photoinitiator 2,2-dimethoxy-2-phenylacetophenone as a UV-crosslinking resin composition on a tin-plated annealed copper stranded wire (7 / 0.021) with an outer diameter of 0.064 mm. It was cured through an ultraviolet irradiation furnace to obtain an insulated electric wire with an insulation thickness of 50 μm.

[Sample 2] 100 parts by weight of urethane acrylate oligomer U-122A, 40 parts by weight of phenoxyethyl acrylate, 10 parts by weight of ethylene oxide-modified phosphoric acid methacrylate, and 7.5 parts by weight of photoinitiator 2,2-dimethoxy-2-phenylacetophenone. UV-crosslinked resin composition consisting of 3 parts of tin-plated annealed copper wire with an outer diameter of 0.064 mm (7 / 0.021)
After coating the above, it was cured by passing through an ultraviolet irradiation furnace to obtain an insulated electric wire having an insulation thickness of 50 μm.

[Sample 3] 100 parts by weight of urethane methacrylate oligomer EB8400 (manufactured by Daicel UCB), 80 parts by weight of dicyclopentanyl methacrylate, 20 parts by weight of neopentyl glycol diacrylate, 2,2-dimethoxy-photoinitiator An ultraviolet-crosslinking resin composition consisting of 10 parts by weight of 2-phenylacetophenone is coated on a tin-plated annealed copper wire (7 / 0.021) with an outer diameter of 0.064 mm and then cured through an ultraviolet irradiation furnace to produce an insulated wire with an insulation thickness of 50 μm. Got

[Sample 4] 100 parts by weight of polybutadiene acrylate oligomer TEAI-3000 (manufactured by Nippon Soda Co., Ltd.), 100 parts by weight of dicyclopentanyl methacrylate,
Photoinitiator 2,2-dimethoxy-2-phenylacetophenone
An ultraviolet-crosslinking resin composition consisting of 10 parts by weight was coated on a tin-plated annealed copper wire (7 / 0.021) having an outer diameter of 0.064 mm and then cured through an ultraviolet irradiation furnace to obtain an insulated electric wire having an insulation thickness of 50 μm.

[Sample 5] Urethane acrylate oligomer U-340AX (manufactured by Shin-Nakamura Chemical Co., Ltd., molecular weight 13)
000) 100 parts by weight, 50 parts by weight of isobornyl acrylate (manufactured by Kyoeisha Oil and Fat Chemical Co., Ltd.), 50 parts by weight of 1.6-hexanediol dimethacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd.), and 2,2 photoinitiators. -Dimethoxy-2-phenylacetophenone 10
A UV-crosslinking resin composition consisting of parts is coated on a tin-plated annealed copper wire (7 / 0.021) with an outer diameter of 0.064 mm for 20 μm, and the urethane acrylate oligomer U is further applied to this outer layer.
The thickness of the UV-crosslinking resin composition is 100 parts by weight of -122A, 50 parts by weight of isobornyl acrylate, and 7.5 parts by weight of 2,2-dimethoxy-2-phenylacetophenone as a photoinitiator.
30μm coating, cured by passing through an ultraviolet irradiation oven,
An insulated electric wire having an insulation thickness of 50 μm was obtained.

Next, the various kinds of electric wires (samples) thus obtained were subjected to the following terminal stripping treatment.

[Example 1] 50 mm of the end of each insulated wire obtained in Samples 1 to 5 was dipped in methylene chloride, a chlorine-based organic solvent having a molecular weight of 85, for 15 seconds and then taken out, and the dipped portion was lightly grasped. By pulling out, the coatings on the immersed parts of all the electric wires could be easily peeled off.

[Example 2] 50 mm ends of various insulated wires obtained in the above Samples 1 to 5 were immersed in trichlorethane, a chlorine-based organic solvent having a molecular weight of 133.4, for 20 seconds, then taken out, and the immersed part was lightly grasped and pulled out. Then, the coatings on the immersed portions of all the electric wires could be easily peeled off.

[Example 3] 50 mm ends of various insulated wires obtained in Samples 1 to 5 were immersed in a solvent containing 70% methylene chloride and 30% methanol of chlorine-based organic solvent for 20 seconds, taken out, and immersed. By lightly grasping the part and pulling it out, the coating of the immersed part of all the electric wires could be easily peeled off.

[Comparative Example 1] 50 mm of each end of the insulated wire obtained in each of Samples 1 to 5 was immersed in a solvent composed of 20% methylene chloride and 80% methanol of a chlorine-based organic solvent for 60 seconds. The coating on some parts could not be peeled off.

Therefore, by using the chlorine-based organic solvent as the coating stripping agent for the ultraviolet irradiation crosslinked resin-coated electric wire, the insulating coating of the ultraviolet irradiation crosslinked resin can be easily stripped. For this reason, since the ultraviolet cross-linking resin composition is used as the coating material for the optical fiber, the present invention is also effective for the peeling treatment of such a coating material for the optical fiber.

[0035]

As described above, according to the present invention,
It has the following effects.

(1) By using an organic solvent having a chlorine-based organic solvent of 50% or more as the coating stripping agent, the insulating coating of the insulated wire coated with the ultraviolet-crosslinking resin composition can be easily stripped.

(2) The end of the electric wire can be easily peeled off by immersing the end of the electric wire obtained by coating the conductor with the ultraviolet-crosslinking resin composition in a chlorine-based organic solvent.

Claims (3)

[Claims] 1. A coating stripping agent for an ultraviolet irradiation crosslinked resin-coated electric wire, wherein an organic solvent containing 50% or more of a chlorine-based organic solvent is used as a stripping agent for stripping an insulating coating of an ultraviolet crosslinked resin-coated electric wire. . 2. The coating stripper according to claim 1, wherein the chlorine-based organic solvent has a molecular weight of 200 or less. 3. An end of an electric wire formed by coating a conductor with an ultraviolet-crosslinking resin composition is dipped in an organic solvent of which 50% or more is a chlorine-based organic solvent having a molecular weight of 200 or less, and then, the insulating coating is dipped. A method of stripping an electric wire end coating using a coating stripping agent for an ultraviolet irradiation crosslinked resin-coated electric wire, which comprises stripping.