JPS6210900Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to an insulated wire that has good adhesion between an insulating coating and a metal conductor, is highly flexible, and has excellent chemical resistance. In recent years, there has been an increase in the number of applications in which insulated wires are required to have strong chemical resistance and flexibility. The chemical resistance and flexibility of insulated wires are greatly influenced by the adhesion between the metal conductor and the insulation coating that make up the insulated wire, so it is possible to improve the adhesion between the metal conductor and the insulation coating. desired. Further, when there are geometrical defects such as slits or die scratches on the surface of the metal conductor, there is a problem in that the insulation coating at the defective portion becomes incomplete and the electrical characteristics deteriorate. This idea was made in view of the above circumstances,
The purpose is to provide an insulated wire that has improved adhesion between the metal conductor and the insulation coating, has excellent flexibility and chemical resistance, and prevents deterioration of electrical properties due to conductor defects. It is characterized in that a specific trihydroxysilane compound layer is interposed at the interface between the conductor and the insulating film. This idea will be explained in detail below. The metal conductors of this invention include copper, copper alloy, aluminum,
All metals that can be electrical conductors can be used, such as aluminum alloys, silver, and nichrome, and can be in the form of solid or stranded wires. The trihydroxysilane compound () interposed at the interface between the metal conductor and the insulating film is represented by the following formula: (Here, R is CH ₂ = CH-, NH ₂ -, SH-, H ₂
＝CH・CH ₂ −,

Indicates a substituent selected from [Formula]. The three -OH groups bonded to Si in the formula form hydrogen bonds with the oxygen atoms of the oxide on the surface layer of the metal conductor, so that the monomolecular film or multimolecular film of the trihydroxysilane compound () becomes a metal. This allows for strong bonding to the conductor surface. In order to form this trihydroxysilane compound () on the surface of a metal conductor, generally, first, a silane compound represented by the following formula () is mixed with water or methanol. (Here, R is the same as the group described above for compound (), and X represents a substituent that is hydrolyzed such as -OCH ₃ -OC ₂ H ₅ or -OCOCH _3. ) Aqueous solution, water-aqueous solution such as ethanol aqueous solution This can be achieved by dipping a metal conductor whose surface has been cleaned by degreasing or the like into a solution of 1 to 20 wt % in a neutral organic solvent system, and then drying it. Then, the insulating film is coated with the silane compound ().
It is formed on a metal conductor whose surface has been treated with This insulating coating is made by applying and baking an insulating paint containing nylon resin, epoxy resin, polyester resin, polyimide resin, polyurethane resin, etc. as a main component by a conventional method. Even better adhesion can be obtained by appropriately selecting the substituent R of the trihydroxysilane compound () depending on the type of resin of the insulating coating. For example, in the case of a nylon resin paint, R has a γ-glycidoxypropyl group.

〔Example〕

Copper wire and aluminum wire with a diameter of 1.5 mm were degreased with trichlorethylene, and vinyltriethoxysilane (CH ₂ =CHSi(OC ₂ H ₅ ) ₃ , silane) and γ-glycidoxypropyltrimethoxysilane were degreased with trichlorethylene. Use silane. ) in a 15wt% ethanol aqueous solution and dried by heating at 180°C for 3 minutes to form a compound layer of vinyltrihydroxysilane and γ-glycidoxypropyltrihydroxysilane. Next, nylon (main component: polyamide resin), polyester (main component: polyester terephthalate), polyurethane (main component: polyurethane), and formal (main component: polyvinyl formal, phenolic resin, furan resin) are processed using a continuous insulation paint baking device. ), epoxy (main components: epoxy resin, polyester urea, formaldehyde) five types of insulating paints are applied and baked using known methods.
An insulating film was formed to have a film thickness of 40 to 45 μm. Using this as a test piece, the following tests were conducted. The results are shown in the table. Withstand voltage test (AC current breakdown when two strands are twisted together) Adhesion (When the insulated wire is stretched by 2.5%, the swelling and peeling of the insulating layer are observed from the outside.) Flexibility (after heating the insulated wire at 150℃ for 1 hour) ,
Due to self-diameter winding, cracks and peeling can be observed from the outside. ) Refrigerant resistance (Enclosed in refrigerant R-22, within 1 hour
After raising the temperature to 100℃ and heating it for 24 hours,
After cooling to room temperature, the test piece was taken out and the coating was rubbed with a 5H pencil lead to examine peeling of the coating. )

【table】

[Table] As explained above, the insulated wire of this invention is
Since a specific trihydroxysilane compound layer of a monomolecular film or a polymolecular film is interposed at the interface between the metal conductor and the insulating film, the trihydroxysilane compound firmly bonds the metal conductor and the insulating film. Therefore, the adhesion between the metal conductor and the insulating coating increases, and therefore the chemical resistance and flexibility of the obtained insulated wire are improved. In addition, a large amount of trihydroxysilane compound adheres to the shape defects of the metal conductor, and as a result, the defect is sufficiently covered with an insulating film, which prevents deterioration of electrical properties caused by shape defects. It has the following advantages.

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view of an insulated wire according to this invention. 1... Conductor, 2... Trihydroxysilane compound layer, 3... Insulating coating.

Claims (1)

[Claims for Utility Model Registration] An insulated wire in which a trihydroxysilane compound layer represented by the following formula is interposed at the interface between a conductor and an insulating coating. (In the formula, R is CH ₂ = CH-, NH ₂ -, SH-, CH ₂
＝CH・CH ₂ −,
Indicates a substituent selected from [Formula]. )