JPH07282640A - Ultraviolet cured self fusing enameled wire and its manufacture - Google Patents

Abstract

PURPOSE:To eliminate the generation of a malodor without generating an organic solvent, when molded by carrying a current, by providing a specific welding resin layer in the periphery of an enameled wire. CONSTITUTION:A fusing powder resin is dispersed in a 30wt.% or more ultraviolet cured resin coating composed of ultraviolet curing oligomer, photochemical polymerizing monomer, photoreaction starting agent, etc., to obtain an ultraviolet cured fusing dispersion coating. After the ultraviolet cured fusing dispersion coating is applied to an upper layer of an enameled wire formed of a conductor 1 and an insulating layer 2, the coating is cured by applying an ultraviolet ray to form a welding layer 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a UV curable self-bonding enameled wire and a method for producing the UV curable self-bondable enameled wire.

[0002]

2. Description of the Related Art A conventional self-bonding enameled wire is manufactured by applying a fusible resin coating on the upper layer of the enamel wire and baking it.

As the enamel wire, formal wire, polyurethane wire, polyester wire, polyesterimide wire, polyamideimide wire and the like are used.

As the fusible resin coating material, polyvinyl formal resin coating material, copolymerized polyamide resin coating material, phenoxy resin coating material, thermoplastic polyester resin coating material and the like are used.

These fusible resin paints are prepared by dissolving the fusible resin in an organic solvent such as cresol.

The self-fusing enamelled wire is wound as an electric device coil and then heat-treated, for example, heated by application to bond the wires to form a molded coil.

In the production of a coil by the thermal fusion method by the electric heating treatment, the fusion time can be shortened and the productivity can be improved by increasing the conduction temperature.

However, when the energizing temperature is raised, the organic solvent of the fusible resin coating, such as cresol, remaining on the self-fusible enameled wire is volatilized and decomposed, and as a result, the working environment at the coil production site is changed to cresol or the like. Exacerbate with odor.

Furthermore, if these shaped coils are incorporated as electric device coils and then operated under severe temperature conditions, a small amount of residual machine solvent may be volatilized to generate a foul odor.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to manufacture an organic self-bonding enameled wire with an organic material. No solvent is used, and as a result, no organic solvent is generated during electroforming using this self-bonding enameled wire as an electrical equipment coil, and the resulting molded coil is severely used after being incorporated as an electrical equipment coil. An object of the present invention is to provide an ultraviolet ray curable self-bonding enameled wire and a method for producing the same, which can eliminate the generation of a bad odor even when operated under various temperature conditions.

[0011]

The main points of the present invention are: A self-melting enamelled wire having a fusion-bonding resin layer provided on the outer periphery of an enameled wire, wherein the fusion-bonding resin layer is composed of a UV-curable resin in which a fusible powder resin is dispersed. Adhesive enameled wire, and.
After applying the ultraviolet curable fusible dispersible coating composition in which the fusible powder resin is dispersed in the ultraviolet curable resin to the upper layer of the enamel wire,
There are two points in the method for producing an ultraviolet curable self-melting enameled wire, which is characterized by irradiating with ultraviolet rays to cure.

The ultraviolet curable resin used in the ultraviolet curable resin coating composition of the present invention comprises an ultraviolet curable oligomer, a photopolymerizable monomer, a photoreaction initiator and the like.

Here, the UV-curable oligomer is not particularly limited, but a depolymerization type heat-decomposable UV-curable oligomer is suitable.

Examples of the depolymerization type thermally decomposable UV-curable oligomer include a UV-curable oligomer having a methacroyl group.

The UV-curable oligomer has few polyfunctional components, low crosslink density and relatively low molecular weight. The type of UV-curable oligomer is not particularly limited,
From the viewpoint of flexibility and toughness, a polyurethane acrylate-based UV-curable oligomer is desirable.

In this case, the polyisocyanate or polyol, which is the material of the polyurethane acrylate-based UV-curable oligomer, preferably has a good thermal decomposability, and for example, tetramethylxylylene diisocyanate is used.

In the present invention, the photopolymerizable monomer is not particularly limited, but is preferably a low boiling point and volatile one.

[0018]

The function of the ultraviolet curable self-bonding enamel wire of the present invention is as follows:
Since the fusible resin layer is a UV-curable resin with fusible powder resin dispersed therein, the solventless fusible resin layer has no solvent, and as a result, is manufactured using self-fusing enameled wire. Even if the electric equipment coil is heated by energization or operated in a high temperature atmosphere, no offensive odor is generated due to volatilization of residual solvent.

Further, the method for producing the UV curable self-melting enameled wire of the present invention comprises the steps of applying an ultraviolet curable fusible dispersant coating comprising a UV-curable resin and a fusible powder resin dispersed in the upper layer of the enameled wire. Since it is cured by irradiating ultraviolet rays, solvent-free coating of the fusible paint can be performed, and as a result, the deterioration of the working environment due to the use of organic solvent can be completely prevented, and the cost of the fusible paint can be increased by using the organic solvent. Can be prevented.

Further, in the present invention, when a depolymerizable heat-decomposable solventless resin having a methacryl group as an ultraviolet-curable oligomer, for example, a polyurethane acrylate-based ultraviolet-curable oligomer is used, an electric device coil wound is unwound by heating. Polymerization type thermal decomposition to lower molecular weight, liquefaction,
Vaporization and volatilization occur, resulting in the volatilization of the polyurethane acrylate-based UV-curable oligomer, leaving only the fusible resin. Depolymerization-type thermal decomposition of this polyurethane acrylate-based UV-curable oligomer occurs at around 300 ° C.

[0021]

EXAMPLES Examples and comparative examples of the ultraviolet curable self-fusing enamelled wire and the method for producing the same according to the present invention will be described below.

As for the enamel wire, the film thickness is JI.
Polyamide-imide wire of type 1 thickness (15 μm) determined by S C 3003 and conductor diameter φ0.16 mm (hereinafter referred to as 1 AI
Abbreviated as W0.16. ) Was used.

(Example 1) Polypropylene glycol /
Ultraviolet rays obtained by adding 100 parts by weight of methyl methacrylate and 5 parts by weight of 2-hydroxyhexylphenyl ketone to 100 parts by weight of a polyurethane methacrylate oligomer synthesized from TMXDI (tetramethylxylylene diisocyanate) / HEMA (hydroxyethyl methacrylate). 100 parts by weight of the thermoplastic copolymerized polyamide resin powder was mixed with the cured resin coating material to obtain an ultraviolet curable fusible coating material. After coating this on 1AIW0.16, it was cured by irradiation with ultraviolet rays to form a fusion layer of 10 μm to obtain an ultraviolet curing self-welding enameled wire.

Example 2 An ultraviolet curable fusible coating composition comprising 5 parts by weight of 2-hydroxyhexyl phenyl ketone and 100 parts by weight of thermoplastic copolyamide resin powder was added to 1 part of AIAI0. 16 μm was applied onto 16 and ultraviolet-cured to obtain an ultraviolet-curable self-bonding enameled wire.

(Comparative Example 1) A self-fusing enamel was prepared by coating a 1% AIW 0.16 fusible coating composition prepared by dissolving a thermoplastic copolyamide in fractional cresol and solvent naphtha onto 1 AIW 0.16 by coating and baking. Got the line.

Comparative Example 2 Polyethylene glycol adipate / TDI (tolylene diisocyanate) / HEA
1 AIW0.16 UV curable coating consisting of 50 parts by weight of isobornyl acrylate, 20 parts by weight of trimethylolpropane triacrylate and 5 parts by weight of 2-hydroxyhexyl phenyl ketone, per 100 parts by weight of polyurethane acrylate oligomer synthesized from To 10
The coating was applied in a thickness of μm and cured with ultraviolet rays to obtain an ultraviolet ray-cured enamel wire.

(Test method) In the test, the obtained test line was tested for residual solvent, odor and adhesiveness.

The residual solvent was quantified by gas chromatography. In addition, the phenol odor was inspected by 5 inspectors. Then, a 20-turn coil having an adhesiveness of φ5 mm was prepared, heat-bonded and electrically heated, and then the tensile tester determined the inter-wire peeling load.

The results of these tests are shown in Table 1.

[0030]

[Table 1]

As can be seen from Table 1, the conventional self-bonding enameled wire of Comparative Example 1 contained 0.12 phenol as the residual solvent.
(Mg / enamel wire 1g), solvent naphtha 0.00
3 (mg / enamel wire 1 g) was detected. For this reason, odors of phenols such as cresol were also detected in the enameled wire alone and the current-carrying coil. The adhesiveness is relatively good.

The UV curable enameled wire of Comparative Example 2 showed no residual solvent, but showed the poorest adhesion.

On the other hand, the UV-curable self-fusing enamelled wires of Examples 1 and 2 showed no residual solvent, no odor was generated, and the adhesiveness was good.

Since the production method of the present invention is solventless coating, the working environment is not deteriorated and the organic solvent is not consumed.

Further, in the ultraviolet curing coating method, since heat does not participate in curing, a enamel wire is manufactured with almost no heat by attaching a filter for cutting infrared rays slightly emitted from the ultraviolet lamp or applying water cooling. can do.

Therefore, unlike the conventional thermosetting method, it can be expected that further low temperature decomposition can be achieved by using a thermal decomposition catalyst or the like for promoting thermal decomposition. As the catalyst, a general peroxide or the like may be used.

[0037]

EFFECT OF THE INVENTION The UV-curable self-fusing enamelled wire of the present invention can completely prevent the deterioration of the working environment due to the use of an organic solvent because the fusible coating is solvent-free, and fuses due to the use of an organic solvent. The cost of paint can be prevented from rising, and even if the electric equipment coil produced using the obtained self-bonding enameled wire is operated under electrical heating or in a high temperature atmosphere, no offensive odor is generated due to residual solvent volatilization. And is industrially useful.

[Brief description of drawings]

FIG. 1 shows a cross-sectional view of an ultraviolet-curing self-bonding enameled wire of the present invention.

[Explanation of symbols]

 1 conductor 2 insulating layer 3 fusion layer

Claims (4)

[Claims] 1. A self-bonding enameled wire comprising a fusion-bonding resin layer provided on the outer periphery of an enamel wire, wherein the fusion-bonding resin layer is composed of a UV-curable resin in which a fusible powder resin is dispersed. UV curable self-bonding enameled wire. 2. The ultraviolet curable self-bonding enameled wire according to claim 1, wherein the ultraviolet curable resin constituting the fusion-bonding resin layer is a depolymerization type heat-decomposable solventless resin having a metacroyl group. 3. The ultraviolet curable self-bonding enameled wire according to claim 1, wherein the blending amount of the ultraviolet curable resin in the fusible resin layer is 30% by weight or more. 4. An ultraviolet ray characterized by applying an ultraviolet-curable fusible dispersion coating composition comprising a UV-curable resin dispersed in a fusible powder resin on the upper layer of an enamel wire, and then irradiating the ultraviolet ray to cure the coating. A method for producing a cured self-bonding enameled wire.