JPS6380415A - Insulated wire - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an insulated wire with excellent self-lubricating properties and improved resistance to processing deterioration.

[Prior art and its problems]

When winding coils of equipment such as electrical and over-reliable equipment,
In recent years, high-speed automatic wire machines have come into widespread use for the purpose of speeding up the process.

For this reason, the surface of the insulating layer of the loquat has sufficient slipperiness,
Abrasion resistance is required.

In order to save labor in making fc and ffi coils,
A self-adhesive insulated wire is used in which an adhesive layer made of polyvinyl acetal is provided on the insulating layer.

In this self-adhesive insulated wire, the outermost adhesive layer exhibits some tackiness, and therefore it is necessary to improve the surface slipperiness and abrasion resistance compared to ordinary insulated wires.

Conventionally, in order to improve such surface slipperiness and wear resistance, a method has been used to provide a lubricating layer by coating wax or lubricating oil on the insulating layer or adhesive layer.

However, in self-adhesive insulated wires with this lubricating layer, when the edges of the wound string coil are impregnated with varnish or when the wires are stuck together due to self-fusion of the adhesive layer, However, there was a problem in that poor adhesion occurred due to the lubricant layer.

Another drawback is that the coating thickness of the lubricant layer is uneven, causing some of the insulating layer or adhesive layer to deteriorate during winding.

[Next method to solve the problem]

Therefore, in this invention, a paint containing fatty acid-modified polyvinyl acetal, which is obtained by reacting polyvinyl acetal with fatty acids and their derivatives, is applied to the outermost layer and baked, thereby imparting good surface slip properties to the insulating layer or adhesive layer itself. This prevents the release of the lubricant and solves the above problems.

First, let's talk about paint. The polyvinyl acetal used here includes polyvinyl butyral obtained by condensing butyraldehyde with polyvinyl alcohol, and polyvinyl formal obtained by condensing formaldehyde! JH#4 I'm annoyed. These polyvinyl acetals preferably have a degree of polymerization of 200 to 3,000, and those with some hydroxyl groups left in the molecule are used.

In addition, fatty acids and derivatives thereof preferably contain linear hydrocarbons having 4 or more carbon atoms, and examples of saturated fatty acids include caproic acid, caprylic acid, capric acid, lauric acid, parbatin, and stearic acid. , arachic acid, behenic acid, etc.; as derivatives, their esters and acid halides/compounds are used; as unsaturated fatty acids, oleic acid, linoleic acid, etc. are used; compounds are used as derivatives.

As a method for reacting polyvinyl acetal with fatty acids and their derivatives, polyvinyl acetal is dissolved in an organic solvent with suitable vortex, and fatty acid is added to this to give a
A method of reacting at 0'D for at least 5 hours or more is employed. The organic solvent used here preferably has a relatively high boiling point and can bathe polyvinyl acetal, and examples include phenol, cresol,
In addition to single compounds containing a phenolic hydroxyl group such as xylenol, alcohols with low boiling points such as heptatool, octatool, and furfuryl alcohols can be used in combination. Polyvinyl acetal and fatty acids; 2
The ratio of fatty acid to 100 parts by weight of polyvinyl acetal is 0.5 to 30 parts by weight of the derivative. If it is less than 0.5 parts by weight, the lubricity will be insufficient, leading to inconveniences, and if it exceeds 30 parts by weight, it will lead to poor storability of the face and poor appearance of the wire, which is inconvenient. This quantitative ratio may be the above-mentioned quantitative ratio for the prepared paint before coating and baking. Therefore, for example, 50 parts of fatty acid and its derivative should be added to 100 parts by weight of polyvinyl acetal.
After adding parts by weight and reacting in an organic solvent, polyvinyl acetal may be added thereto, and the amount of the fatty acid derivative may be adjusted to be in the range of 0.5 to 30 parts by weight. The amount of the 81 solvent used is approximately 300 to 2,000 parts by weight per 100 parts by weight of polyvinyl acetal, and is appropriately determined depending on the viscosity of the finished paint.

This paint contains melamine resin, phenol resin,
It is also possible to appropriately add resins such as resins, epoxy resins, isocyanates, cryoxal, and the like. The amount of these resins added is 20 parts by weight per 100 parts by weight of polyvinyl acetal, depending on the required wire characteristics (recycling properties, chemical resistance, etc.).
A range of from 100 parts by weight is preferred, but is not limited thereto. In addition, the paint contains other thermosetting resins, thermoplastic resins, fillers, catalysts, pigments, dyes, etc., and furfuryl alcohol for the purpose of viscosity adjustment, to the extent that the properties of the above reaction solution are not impaired. One or more of solvents and diluents such as , xylene, cyclohexanone, naphtha, and alcohol may also be added.

Such a paint is applied to the conductor directly or through another insulating layer or an adhesive layer so as to form the outermost layer, and is baked to form the desired insulated wire. Coating and baking are performed using a normal enamel coating and baking furnace, etc., and the baking temperature is approximately 250℃.
~450°C.

The film thickness after baking is approximately 1 to 10 μm.

If the above paint is made by reacting polyvinyl acetal with fatty acids or derivatives thereof, coating,
The baked coating becomes a self-adhesive layer with surface lubrication, and when added with phenolic resin, melamine resin, epoxy resin, etc., it functions as an insulating layer with surface lubrication, and is self-adhesive and corrosion-resistant with good surface slipperiness. 1! This results in an insulated wire with good wire or surface slipperiness. In addition, any resin may be used to form the other P3 green layer, such as polyurethane, polyvinyl formal, polyester, polyesterimide, polyhydantoin, polyesterimide, polyesteramideimide, polyhydantoin ester,
Examples include polyesteramide. Furthermore, any resin may be used to form the other adhesive layer, such as polyvinyl butyral, polyamide, and phenoxy resin.

In such insulated wires, the outermost layer is coated with polyvinyl acetal chemically bonded by reacting fatty acids or derivatives thereof, which improves surface lubricity and wear resistance. is high, and the adhesiveness between the poly and nyl acetal itself is also good, so that even in high-speed winding, the continuous layer is not damaged, and the adhesive force after heat welding of the wound coil is also high. In addition, fatty acids and their derivatives do not ooze (bleed) onto the surface and do not stain the guide pulleys of the winding machine. Furthermore, the thickness of the film in the longitudinal direction is uniform because it is applied and baked multiple times, and there is no variation in surface lubricity or wear resistance. In general, since the paint is mainly composed of reactants, it does not suffer from problems such as phase separation, gelation, or clouding, and has excellent storage stability.

[Example 1] 100 parts by weight of polyvinyl butyral (Denka Kagaku Kogyo Co., Ltd., trade name Denka Butyral) was mixed with 300 parts by weight of cresol.
1 part by weight of stearic acid was added to this, and the mixture was allowed to react at 190°C for 5 hours. Then, 100 parts by weight of xylene was added to form a paint. Apply this paint to a diameter of 0.51jl.
A formal insulated wire is coated and baked to a thickness of 5 μm to form a surface-lubricated, self-adhesive insulated ML wire.

(Example 2) A surface-lubricated, self-adhesive insulated wire was obtained in the same manner as in Example 1, except that 5 parts by weight of stearic acid was used for binding holes.

(Example 3) In Example 1, the stearic acid substitute b') was Hoechst wax S (product name, montan wax acid (chain length C28-C3°) sold by Hoechst Javan Co., Ltd.), and higher fatty acid A surface-lubricated, self-adhesive insulated wire was obtained in the same manner except for the holes, using 1 part by weight of 1 part by weight.

(Example fII4) In Example 3, Hoechst Wax S was applied to the 51most part and the surface was lubricated in the same way except for the holes.Self-adhesive insulation'1! Got the line.

(Example 5) 100 parts by weight of polyvinyl formal (1! Kikagaku Kogyo Co., Ltd., trade name: Denka formal) was heated and dissolved in 500 parts by weight of cresol, and 171 parts by weight of stearic acid was added thereto and 5 parts by weight were added at 190°C. After the time reaction field, 3079 parts of incyanate (Japan Polyurethane Industry Co., Ltd., Coronate AP Stable, Block Polyisocyryone), 20 parts of melamine resin, 20 parts of phenolic resin! Just in case you add some parts to the paint. This was coated and baked to a thickness of 5 μm on a formal insulated wire with a diameter of 0.5 μl to obtain a surface-lubricated and insulated wire.

(Example 6) A surface lubricated loquat was obtained in the same manner as in Example 5 except that 5 parts by weight of stearic acid was used.

(Example 7) An ultra-fine electric wire with surface lubrication was obtained in the same manner as in Example (g) 15 except that tocosanoic acid 1 was placed in place of stearic acid except for the holes.

(Example 8) Surface lubrication electrofusion was performed in the same manner as in Example 7 except that 5 parts by weight of tocosanoic acid was used (Comparative Example 1) Jade material was prepared in the same manner as in Example 1 without adding stearic acid. This was coated on a copper wire with a diameter of 0.5 Ll to a thickness of 15 μm and baked to obtain a self-adhesive insulated wire with surface lubrication.

(Comparative Example 2) A paint similar to that in Example 5 was made without the addition of stearic acid, and using this paint, surface lubrication was also improved in the same manner as in Comparative Example 1.
L got a wife.

(Comparison f1.+3) 100% polyvinyl butyral and 5t stearic acid
ffi part was dissolved in 300ii parts of cresol, and xylene lOO heavy part was added thereto to make a paint. This was applied to a formal insulated electric machine with a diameter of 0.5B and baked, and the surface was lubricated and self-adhesive P3 green. Be careful with electric wires. In this case, the paint becomes cloudy and gelatinous after about a week, indicating this problem with the storage stability of the paint.

Various characteristics were measured for the insulated wires obtained in these Examples and Comparative Examples, and the comparative results are shown in the attached table.

As is clear from the attached table, the insulated electric machine of the present invention has a low coefficient of friction, high wear resistance, good surface slipperiness, and good adhesion of the winding coil.

〔Effect of the invention〕

As explained above, since the outermost layer of the paint containing the fatty acid-modified polyvinyl acetal obtained by reacting the insulated polyvinyl acetal of the present invention with a fatty acid or a derivative thereof is coated and baked, one surface of the paint is coated and baked. It has good slip properties and good adhesive strength when made into a wound coil.

In addition, the film has strong strength, and fatty acids and the like do not ooze out to the surface even when subjected to heat cycles, and the winding machine will not be contaminated. Moreover, it has the advantage that the paint has good storage stability.

Claims (1)

[Claims] An insulated wire made by coating the outermost layer with a paint containing fatty acid-modified polyvinyl acetal, which is made by reacting polyvinyl acetal with fatty acids or fatty acid derivatives, and baking it.