JPS6339625B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a self-bonding insulated wire with excellent heat resistance. Self-bonding insulated wires can be bonded between wires without using impregnated varnish, so they have great advantages in terms of improved productivity, rationalization, and pollution reduction. However, conventional self-bonding insulated wires often use thermoplastic resins such as butyral resin, phenoxy resin, polyamide resin, etc. for the adhesive layer, and therefore cannot maintain adhesive strength above the softening point. Because it used a resin with low heat resistance, it was difficult to use it at high temperatures, and in reality it could only be used in an atmosphere below 100°C. In view of the above-mentioned circumstances, the inventors of the present invention have conducted extensive research in order to obtain a self-bonding insulated wire that has excellent heat resistance and can withstand use even at high temperatures, and as a result has achieved the present invention. . That is, as shown in the figure, 10 to 200 parts by weight of a linear polyester resin having an OH group in the molecule and having a molecular weight of 10,000 or more and The following structural formula 5 to 25 parts by weight of the titanium octylene glycol chelate compound shown by is blended with 100 parts by weight of the total resin, blended with a stabilizing isocyanate if necessary, and a solution of this dissolved in an organic solvent is applied and baked on the B stage. This is a self-bonding insulated wire characterized in that a self-bonding layer 3 is provided. Next, the polyhydantoin resin solution used in the present invention is polyhydantoin acid in a solution state or partially ring-closed to form a polyhydantoin ring, and is usually obtained by reaction of a glycine derivative, an isocyanate, an amine, etc. It will be done. Further, a detailed method for producing a polyhydantoin resin solution is described in, for example, Japanese Patent Publication No. 1973-20115. or,
A commercially available polyhydantoin resin solution is the product name PH-20 manufactured by Bayer AG, Germany. Next, examples of the linear polyester having a reactive OH group in the molecule having a molecular weight of 10,000 or more used in the present invention include, for example, Byron-200 (trade name) manufactured by Toyobo Co., Ltd., Byron-300 (trade name) manufactured by Toyobo Co., Ltd., and PE (trade name) manufactured by Gutdeyer Co., Ltd. (USA). -200, PE207, etc. The reason why the molecular weight of the linear polyester resin is limited to 10,000 or more is that if the molecular weight is 10,000 or less, it will affect the flexibility of the self-bonding insulated wire. Also, the reason why the amount of the linear polyester resin is limited to 10 to 200 parts by weight per 100 parts by weight of solid content of the polyhydantoin resin solution is that if it is less than 10 parts by weight, the temperature required for fusion will be high. This is not preferable because it is too much, and if it exceeds 200 parts by weight, the heat resistance and adhesive strength in a high temperature atmosphere are significantly reduced. Next, the commercially available titanium octylene glycol chelate compound shown by the above structural formula is TC-200 (trade name, manufactured by Matsumoto Pharmaceutical Co., Ltd., 70
% butanol solution). The reason why the amount of titanium octylene glycol chelate was limited to 5 to 25 parts by weight based on 100 parts by weight of the total resin content is that if it is less than 5 parts by weight, the crosslinking effect will be poor and the adhesive strength in a high temperature atmosphere will decrease. Moreover, if more than 25 parts by weight is blended, the crosslinking density will become too high and the adhesive performance will deteriorate. In addition, it is also possible to further improve the heat resistance by adding a stabilizing isocyanate in an amount of 10% by weight or less based on the total resin amount. As a stabilizing isocyanate, the product name Coronate manufactured by Nippon Polyurethane Co., Ltd.
AP Steeble etc. are suitable. Next, the present invention will be explained by giving Examples and Comparative Examples. Example 1 An esterimide insulating paint (trade name: Isomid, manufactured by Nippon Schenecta Dei Chemical Co., Ltd.) was coated and baked on a copper wire having a diameter of 0.5 mm to obtain an esterimide insulated wire having an insulation thickness of 25 μm. Apply fusion paint to this insulated wire as follows: Furnace length: 4 m, temperature: 250°C.
A self-bonding insulated wire according to the present invention was obtained by coating and baking to a thickness of 15 μm by die coating three times at a speed of 12 m/min. [Adjustment of adhesive coating] 100 parts by weight of polyhydantoin resin solution (product name: PH20, manufactured by Bayer AG, Germany, diluted to 20% by weight with cresol), linear polyester resin (product name: Byron 200, manufactured by Toyobo Co., Ltd.). 50 parts by weight dissolved in cresol and adjusted to a concentration of 20% by weight and titanium octylene glycol chelate compound (manufactured by Matsumoto Pharmaceutical Co., Ltd., trade name TC-200-70)
% butanol solution) was stirred and mixed to obtain a fusion coating. Examples 2 to 5, Comparative Examples 1 to 3 The esterimide paint (Nippon Schenectady Film thickness: 25 μm obtained by applying and baking
The insulated wires were coated and baked in the same manner as in Example 1 to obtain self-bonding insulated wires having a total film thickness of 40 μm, which were designated as Examples 2 to 5 and Comparative Examples 1 to 3. Example 6 A copper wire with a diameter of 0.5 mm was coated with esterimide paint (trade name Isomid, manufactured by Nippon Schenectaday Co., Ltd.) to a thickness of 20 μm and baked, and on top of that, an amide-imide paint (trade name HI-400, manufactured by Hitachi Chemical Co., Ltd.) was applied to a thickness of 5 μm. This was coated and baked to obtain a so-called amide-imide overcoated insulated wire, and the fusing paint used in Example-1 was further applied and baked under the same conditions as in Example-1 to obtain a self-bonding insulated wire. .

【table】
(Unit: parts by weight)
Comparative Example 4 A copper wire with a diameter of 0.5 mm was coated with 25μ thick esterimide paint (trade name: Isomid, manufactured by Nippon Schenectaday Co., Ltd.) and baked, and then a 20% cresol solution of phenoxy resin (trade name: PKHH, manufactured by UCC Corporation in the United States) was applied on top of it. A self-bonding insulated wire coated and baked to a thickness of 15μ was obtained. The fusing performance of each of the self-fusing insulated wires obtained in Examples 1 to 6 and Comparative Examples 1 to 4 was investigated. First, each self-bonding insulated wire was tightly wound around a winding rod with a diameter of 5 mm to create a helical coil with a length of 70 mm, which was heated at 200°C for 30 minutes to fuse, and then ASTMD - Measure the adhesive strength between wires by bending according to 2519, and use the obtained results as the second
Shown in the table. In addition, in order to see the degree of decrease in adhesive strength in a high temperature atmosphere, adhesive strength was measured at 150°C. The obtained results are also listed in Table 2. In addition, the adhesive strength after heat deterioration at 220° C. for 7 days was also measured, and the obtained results are also listed in Table 2.

[Table] As is clear from Table 2, the self-bonding insulated wire of the present invention has high adhesive strength in a high-temperature atmosphere, and maintains sufficient adhesive strength even when heated at high temperatures for a long time. It has extremely excellent performance.

[Brief explanation of the drawing]

The drawing is a sectional view for explaining the structure of an example product of the self-bonding insulated wire of the present invention. 1... Electric conductor, 2... Insulator layer, 3... Self-bonding layer.

Claims (1)

[Claims] 1. 10 to 200 linear polyester resin having an OH group in the molecule and having a molecular weight of 10,000 or more based on 100 parts by weight of the solid content of the polyhydantoin resin solution, placed on the electric conductor via another insulating layer. Parts by weight and the following structural formula A titanium octylene glycol chelate compound represented by 5 to 25 parts by weight is an essential component based on 100 parts by weight of the total resin content, a stabilizing isocyanate is blended as necessary, and a solution of this in an organic solvent is prepared as a B-stage. A self-bonding insulated wire characterized by having a self-bonding layer formed by coating and baking the wire.