JPH01265412A - Self-adhesive insulated wire - Google Patents

Abstract

PURPOSE:To improve the heat resistance of a wire and make its soldering process possible by applying and baking, on the outermost layer, a coating including stabilized polyisocyanate and aliphatic polyol selected from a group of polyester and polyvinyl butyral. CONSTITUTION:A coating including stabilized polyisocyanate and more than one kind of aliphatic polyol selected from a group of polyester and polyvinyl butyral is applied and baked on an insulating layer 2 to form an adhesive layer 3. The adhesive layer 3 gets to consist of a king of an urethane resin owing to the urethane bond caused by the reaction of aliphatic polyol with stabilized polyisocyanate, and forms a bridge structure to improve its heat resistance. The layer 3 never becomes a carbide due to its rapid combustion and vaporization because of its polymer structure having no benzene ring in molecule. And its soldering process is made possible without peeling off the adhesive layer 3, because the adhesive layer 3 is a kind of urethane resin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a self-adhesive insulated wire used as a magnet wire or the like in electronic equipment, electrical equipment, etc.

[Prior art and problems to be solved by the invention] Self-adhesive insulated wires are made of formal, polynisdelimide,
An insulating paint made of polyesteramideimide, polyimide, polyester, polyurethane, etc. is applied and baked to form an insulating layer, and an adhesive paint made of polyamide, polyvinyl butyral, coniboxy, phenoxy, polyester, etc. is applied on top of this insulating layer. It is baked to form an adhesive layer and then truncated, eliminating the need for resin 1 nonis impregnation treatment after coil winding, simplifying the work of fixing the coil.
Widely used.

By the way, since the terminals of such self-adhesive insulated wires are soldered and connected to various devices, it is necessary that the terminals of such self-adhesive insulated wires have good properties. When soldering, carbide etc. of the insulating layer and adhesive layer should not be generated at the boundary of the J part. It is hoped that the applicant will meet certain conditions, such as being competent.

In addition, there is an increasing desire to increase the heat resistance of the coil fixing force, and an adhesive layer made of a thermosetting resin is increasingly being formed.

1] However, with self-adhesive insulated wires that have a contact layer made of polyamide or polyvinyl butyral, low-temperature soldering is possible, and although there is little generation of carbides, there is
Since it is a lil resin, it has a drawback of low heat resistance.

On the other hand, those having an adhesive layer made of epoxy, phenoxy, or the like have good heat resistance but cannot be soldered at low temperatures and have the drawback of producing a large amount of carbide.

[Means to solve the problem]

In the present invention, the solution is to form an adhesive layer by coating and baking a paint containing one or more aliphatic polyols selected from the group of polyesters and polyvinyl butyrals and a stabilized polyisocyanate. The material has been designed to provide both durability and heat resistance at the same time.

FIG. 1 does not show an example of the self-adhesive insulated wire of the present invention, and reference numeral 1 in the figure indicates a conductor. There is insulation 1 on this conductor 1.
i2 is provided. This insulating layer 2 is made of polyvinyl formal, polyester, polyurethane, silicone,
An insulating paint made of epoxy, night, phenoxy, polyimide, polyesterimide, polyesteramideimide, polyhydantoin, polyhydantoin esterimide, etc. is applied and baked to a thickness of approximately 0.3 to 20 μm. be. As the resin that makes the most sense,
The above-mentioned materials are widely used, but the use of polyurethane has the advantage that the insulating layer 2 can be soldered as is without peeling off during half-elf bonding.
゛A contact layer 3 is provided on this constant R layer 2. This contact W f, 13 is formed by coating the insulating layer 2 with a paint containing one or more aliphatic polyols selected from the group of polynisdel and polyvinyl butyral and a stabilized polyisocyanate and baking it. . Here, the aliphatic polyol refers to one that does not have a benzene ring in the polyol molecule.

The above-mentioned polynisdels include oxalic acid, succinic acid, geltaric acid, adipic acid, pimelic acid, superric acid, azelaic acid, sebacic acid, isosebacic acid, maleic acid,
dicarboxylic acid such as fumaric acid or its anhydride;
Dihydroxylpolyester obtained by reaction with human O-gycyl compounds such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, and butylene glycol, and lactones such as caprolactone and trimethyl []-lupan, trimethylolethane, hexane Tri and droxyl polyester obtained by reacting a trihydrooxyl compound such as triCl-yl can be used.

Furthermore, polyvinyl butyral is obtained by condensation of polyvinyl alcohol and butyraldehyde, and the polyvinyl butyral used here has a degree of polymerization of 300.
~300G and a degree of butyralization of 70 to 90 mol% is preferable, and it is desirable that a sufficient amount of water 1111 which reacts with the isocyanate group of the stabilized polyisocyanate described below exists in the molecular chain.

In addition, for stabilized polyisocyanates that react with these polyols, the isocyanate groups of the polyisocyanates are temporarily masked (blocked) with a protective agent such as phenol, amide, or alcohol to make them inactive, and if necessary, heat or This method uses a catalyst to dissociate the protective agent and regenerate the isocyanate groups.For example, trimethyl dipropane is used as the polyhydric alcohol, and tolylene diisocyanate is added to the polyisocyanate, which is masked with phenol (product name). Desmodur AP, Coronate AP Sudaple, etc.) and alcohol block polyisocyanates using alcohols such as methanol, ethanol, propatool, butanol, ethylene glycol, etc. as protective agents are used, but are not limited thereto.

The blending ratio of the aliphatic polyol and the stabilized polyisocyanate is 10 to 300 parts by weight of the stabilized polyisocyanate to 4 parts by weight of the aliphatic polyol. If the stabilized polyisocyanate is less than 10 parts by weight and 211 parts by weight, the crosslinking density will be insufficient and sufficient heat resistance will not be obtained, and if it exceeds 300 parts by weight, the crosslinking density will be high (too much, and good soldering properties will not be obtained). In addition, unreacted polyisocyanate remains, which deteriorates the flexibility, adhesion, etc. of the adhesive layer 3.

Then, the aliphatic polyol and the stabilized polyisocyanate are mixed at the above mixing ratio, and ethanol,
Dissolved in a solvent such as butanol, xyl, cyclohexanone, or a mixed solvent of two or more of these,
It is considered a paint. The resin content of this paint is approximately 5 to 40% by weight. This paint is applied onto the insulating layer 2 and baked to form the adhesive layer 3. The thickness of the adhesive layer 3 is about 0.5 to 10 μm, but it can be made to a thickness other than this depending on the purpose. The coating and baking of the paint is carried out using an ordinary enamel paint coating and baking machine, and the baking conditions are a furnace temperature of 2.
The temperature is 00 to 400°C and the baking time is about 0.1 to 30 seconds.

In such a self-adhesive insulated wire, the adhesive layer 3 is composed of one type of urethane resin, with urethane bonding occurring through a reaction between the aliphatic polyol and the stabilized polyisocyanate. Therefore, the adhesive layer has a crosslinked structure and has good heat resistance. Furthermore, since it has a polymer structure that does not have a benzene ring in its molecule, it quickly burns, vaporizes, and does not become a carbide. Furthermore, since it is a type of urethane resin, it is possible to attach Lfl without peeling off the contact M layer 3. Especially, if the insulating layer 2 is made of polyurethane, both the insulating layer 2 and the adhesive layer 3 can be completely removed. Peeling I
It is possible to apply half-il without having to do so.

It is also possible to directly coat and bake a paint on the J3.4 coating 1 to provide only the adhesive layer 3, so that the adhesive layer 3 also serves as the insulating layer 2.

〔Example〕

Hereinafter, the effects of this invention will be clarified by showing examples.

In each of the following Examples and Comparative Examples, paint was applied on a polyurethane copper wire with a conductor diameter of 0.5M and an insulation layer thickness of 10μm.
A self-adhesive insulated wire was obtained by baking to form an adhesive layer of F935 μm. Regarding this item, electric resistance JE (BVD,
Tests were conducted for the presence or absence of carbide formation.

The results are shown in the attached table.

(Example 1) Polyvinyl Bubu-Ral (Denkabuchi Seal 6000G
>100 parts by weight and 80 parts by weight of stabilized polyisocyanate (Coronate AP Stable) were dissolved in 2000 parts by weight of a 1:1 mixed solvent of ethanol and xylene, and then a paint was applied and baked.

(Example 2) Polyvinyl butyral (ancabutyral-2000t
A paint prepared by dissolving 1 part by weight of I100 and 60 parts by weight of stabilized polyisocyanate (Millionate MS-50) in 1000 parts by weight of a 1:1 mixed solvent of n-butanol and Kijirol was applied and baked.

(Example 3) Polyvinyl Buboular (Denkabuty Rule 3000
K) parts by weight of 10011i and 100 parts by weight of stabilized polyisocyanate (Colonate C'1-Stable),
Cyclohegilinone, Kijirol 1:1 mixed solvent 100
The dissolved paint was applied to the 0 weight h''! section and baked.

(Example 4) Desmophin 800 (trade name 1
31 polyurethane industry) 100 yen Hanging part and stabilized polyisocyanate (Coronate AP Stable) 100 yen
The n-end was treated with a 1:1 mixed solvent of ethanol and Kijirol 20
00 weight was applied and baked.

(Comparative Example 1) Polyvinyl acetal (Denkabuchi Seal 6000C)
A paint prepared by dissolving 100 parts by weight in 1000 parts by weight of a 1:1 mixed solvent of ethanol and Kijiroru was applied and baked.

(Comparative Example 2) 100 parts by weight of epoxy-polyamide resin, cresyl,
Xylene 1:1 mixed solvent 1000. The molten paint R1 was applied to the hanging part and baked.

As is clear from the results in the appended table, the self-adhesive insulated wire of the present invention has good properties when applied with technique 1, does not generate carbide, and has excellent adhesive strength.

〔Effect of the invention〕

As explained above, the self-adhesive insulated wire of the present invention is
The adhesive layer has a crosslinked structure and is heat resistant because it is made by applying and baking a paint containing one or more aliphatic polyols obtained from the group of polynisder and polyvinyl acetal and a stabilized polyisocyanate as the outermost layer. , especially excellent heat softening resistance. Furthermore, since there is no benzene ring in the molecule, no carbide is generated even when heated during sendazuki.

Furthermore, since it is made of polyurethane resin, it has the advantage that it can be directly attached to a cliff without peeling, and that half-U1 attachment has good properties.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an example of the self-adhesive insulated wire of the present invention. 3... (4 layers. Applicant IIE Kura Electric Wire Co., Ltd. Annex 1 Attached Table-1: Based on Jl5-C-3003, 11-2. Adhesive strength was measured. Umbrella 3: By visual inspection Judgment. 1st

Claims (1)

[Claims] A self-adhesive insulated wire made by coating the outermost layer with a paint containing one or more aliphatic polyols selected from the group of polyester and polyvinyl butyral and a stabilized polyisocyanate and baking it.