JPH01294307A - Self-welded insulated wire - Google Patents

Abstract

PURPOSE:To improve the flexibility and heat resistance of a self-welded insulated wire, by applying a coating prepared by dissolving an admixture containing both of stabilized polyisocyanate and a polyhydroxypolyether resin added to a low molecular weight polyhydantoin resin in an organic solvent to the surface of a wire rod for the self-welded insulated wire, and baking the coating on the wire rod to manufacture the self-welded insulated wire. CONSTITUTION:A self-welded insulated layer is formed by applying a coating prepared by dissolving an admixture containing 3 to 30 pts.wt. of stabilized polyisocyanate and 10 to 200 pts.wt. of a polyhydroxypolyether resin having its molecular weight of not less than 10,000, both added to 100 pts.wt. of a low molecular weight polyhydantoin resin in an organic solvent to the surface of a wire rod for the self- welded insulated wire in the title, and baking the resultant coating on the wire rod. The low molecular weight polyhydantoin resin described here is composed of polyhydantoic acid in its liquid condition or the polyhydantoin having its polyhydantoin ring formed with its atomic rings opened partially. Meanwhile, the stabilized polyisocyanate is prepared by stabilizing polyisocyanate such as diisocyanate, triisocyanate, etc., with the aid of phenol, cresol or the like. As a result, the self-welded insulated wire can have its improved flexibility, head resistance and refrigerant resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a self-bonding insulated wire with excellent heat resistance and refrigerant resistance.

(Prior art) In recent years, self-bonding insulation 'FLIf! The demand for A is rapidly increasing due to the rationalization and labor saving of the coil processing process, and its uses are also being expanded. In this self-bonding insulated wire, thermoplastic resins such as phenoxy resin, polyvinyl butyral resin, or polyamide resin are often used as the resin forming the fusible resin insulating layer.

However, as the uses of self-bonding insulated wires rapidly expand, they are being used not only for general purpose purposes, but also as coils for devices that are subject to vibration and are used at high temperatures, such as transformers and electric motors. is being attempted.

For such applications, if the welding resin layer is formed using only thermoplastic resin as described above, vibrations may be applied, and when heated to high temperatures, problems such as paralysis of the coil may occur, or the coil may become damaged. Due to poor heat resistance, the entire device had to be used at a lower temperature.

Furthermore, when used in hermetic motors such as refrigerators, which is one of the major fields of use for enameled wires, the above-mentioned resins have a problem in that they are difficult to use because of their poor freezing resistance.

Therefore, self-bonding insulation 'rjL is suitable for such applications.
A self-fusing insulated wire has been proposed in which the hardness of the fusing resin layer is kept at semi-hardened, so-called B stage, and the wire is fused and hardened by heating during coil forming. For example, a self-bonding resin layer is formed using a phenoxy resin to which a phenol resin or a melamine resin is added, or a polyhydroxy ether resin mixed with a titanium compound.

However, the method of keeping the hardness of the fusion resin layer at this B stage level has the disadvantage that the coating of the insulated wire has poor flexibility, and this insulated wire is particularly Cannot be applied to speed automatic winding machine and
Since the shell 7 life of jLa was extremely short, its use was substantially restricted.

(Problems to be Solved by the Invention) The present invention has been made as a result of extensive research in view of the current situation, and has developed a self-bonding insulated wire with excellent flexibility and heat resistance.

(Means for Solving the Problems) The present invention provides a self-fusing insulated i-line in which a fusing resin insulating layer is provided on a conductor directly or via another insulating layer, in which the fusing resin insulating layer is , low molecular weight polyhydantoin resin 100
3 to 30 parts by weight of stabilized polyisocyanate and 10 to 100 parts by weight of polyhydroxy polyether with an average molecular weight of 10,000 or more! It is characterized in that it is formed by applying and baking a paint in which a certain amount of a mixture is dissolved in an organic solvent.

In the present invention, the low-branched polyhydantoin resin, which is a component for forming the fused resin insulating layer, is polyhydantoin acid in a solution state or partially opened to form a polyhydantoin ring, and usually It is observed in the reaction of glylene derivatives with incyanates, amines, etc. A method for producing the polyhydantoin resin solution is, for example, the method described in Japanese Patent Publication No. 44-20115. It is preferable that the degree of branching of the polyhydantoin is low, and a suitable commercially available product is Gistherm PH-20 manufactured by Bayer AG, Germany.

The stabilized polyincyanate, which is the second component, is one obtained by stabilizing a polyincyanate such as diincyanate or triisocyanate with phenol, cresol, etc. MS-50 (trade name, manufactured by Nippon Polyurethane Kogyo Co., Ltd.), CT Staetsl (trade name, manufactured by Bayer AG, Germany), etc.

Further, as the third component, a polyhydroxy polyether resin having a molecular weight of 10,000 or more, the following structural formula (1) is used.
, <2).

2 〇 = 0 (where n and m are positive integers, R is a resin acid or an aromatic residue) The average molecular weight of this polyhydroxy polyether resin is 1
The reason for limiting the number to 0,000 or more is that if it is less than 10,000, the flexibility of the self-bonding insulated wire is poor.

The commercially available polyhydroxypolyether resin is YP-50 (trade name, manufactured by Tobu Kasei Co., Ltd.).

There is H157, I (353 (trade name, manufactured by Dainippon Ink Co., Ltd.).

However, the present invention has disadvantages in that the flexibility of the stabilized polyiso resin insulating layer is inferior to 100 parts by weight of the above-mentioned low-branched polyhydantoin resin, and it requires extremely high temperatures for fusing.

In addition, the amount of polyhydroxy polyether resin added is 10 to 10 parts by weight per 100 parts by weight of low-branched polyhydantoin resin.
The reason why it is limited to 0 parts by weight is that if it is less than 10 parts by weight,
The flexibility of the fused resin insulating layer is poor and the temperature required for fusion is too high, which is not practical. 100 again
This is because if the amount exceeds 1 part by weight, the heat resistance and refrigerant resistance of the fused resin insulating layer will decrease.

(Example) Examples (1) to (7) and Comparative Examples (1) to (2) A low-branched polyhydantoin resin solution (manufactured by Shimakuni Bayer AG, trade name: Jistherm PH20, solid A cresol/solvent naphtha solution containing 50% of AP Staol (product name manufactured by Nippon Polyurethane Industries Co., Ltd.) and a cresol/solvent naphtha solution containing 30% of polyhydroxypolyether resin were added to a flask. The mixture was heated and stirred at 120° C. for 3 hours to obtain a self-fusing resin paint.

Then, an insulating layer was formed by applying and baking an esterimide paint (trade name: Isomid, manufactured by Sknectadei Co., Ltd.) to a thickness of 30 microns on a copper wire with a diameter of 1 m, and on top of that, the self-adhesive resin paint was applied in a furnace. 3m long.

The self-fusing insulated wire of the present invention and the self-fusing insulated wire of the comparative example were manufactured by coating and baking once in a baking oven with a furnace temperature of 300°C at a wire speed of 10 m/min. did.

Conventional Examples (1) to (2) A self-fusing insulated wire (Conventional Example (1)) in which phenoxy resin paint was applied and baked three times on a copper wire with a diameter of 1 m under the same baking conditions as above (Conventional Example (1)) and a copper wire with a diameter of 1 m Phenoxy resin 1 on the line
A self-fusing insulated wire (Conventional Example (2)) was obtained by applying and baking a paint consisting of 0.00 parts by weight and 20 parts by weight of a melamine formaldehyde resin three times under the same baking conditions as above.

The adhesive strength and flexibility of the thus obtained self-bonding insulated wire of the present invention, the comparative self-bonding insulated wire, and the conventional self-bonding insulated wire were measured as their performance. The results are shown in Table 1.

Notes (1) Resostherm PH-20 (trade name manufactured by Bayer AG in country A) (2) Coronate AP Stable (trade name manufactured by Nippon Polyurethane Co., Ltd.) (3) Dezmodul AP Stable (trade name manufactured by Bayer Corporation in island country) (4) ) YP50 (trade name manufactured by Tobu Kasei Kogyo Co., Ltd.) (5) H3
53 (trade name manufactured by Dainippon Ink Industries Co., Ltd.) (6n Bleiofen 501.0 (trade name manufactured by Dainippon Ink Industries Co., Ltd.) In the above table, the adhesive strength test method is as follows: A helical coil with a length of 80cm was created by tightly winding insulated wire, and after heating it at t-150℃ for an hour, it was heated at room temperature and 15cm according to ASTM D-2519.
The adhesive strength was measured by t-measurement at 0°C.

The flexibility test method is to test each insulated wire with its own diameter (1,0cm).
The number of chimes generated on the insulating film was measured by winding a tfcl 0 wire around the insulating film.

(Effects of the Invention) The self-bonding insulated wire of the present invention has excellent flexibility, heat dissipation properties, and refrigerant resistance, so it can be used as a transformer.

It is extremely useful as it can be used in equipment that is subjected to vibrations and heated to high temperatures, such as electric motors.

Claims (1)

[Claims] In a self-bonding insulated wire in which a fusion resin insulating layer is provided on a conductor directly or via another insulating layer, the fusion resin insulating layer is made of stabilized polyisocyanate 3 with 100 parts by weight of a low-branched polyhydantoin resin. ~30 parts by weight and molecular weight 100
00 or more polyhydroxy polyether resin 10-20
1. A self-bonding insulated wire, characterized in that it is formed by applying and baking a paint containing a mixture containing 0 parts by weight dissolved in an organic solvent.