JPH06111632A - Insulated wire - Google Patents

Abstract

PURPOSE:To obtain a polyamide-imide resin insulated wire, of which adhesion and abrasion resistance and flexibility are improved. CONSTITUTION:A conductor is coated with the coating obtained by adding 0.05-1.0 parts by weight of trialkylamine relative to 100 parts by weight of the resin of the polyamide-imide resin solution obtained by reacting tricalboxylic acid anhydride and di-isocyanate and/or di-amine in the polar solvents, directly or through other insulating material layer, and the coated conductor is burned. Polyamide-imide resin insulated wire, in which the excellent heat resistance characteristic of the polyamide-imide resin is maintained and the adhesion to a conductor and flexibility are improved remarkably and abrasion resistance is improved, is thereby obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated wire used for electric equipment, and more particularly to a polyamide-imide resin insulated wire having improved flexibility and adhesion.

[0002]

2. Description of the Related Art In recent years, electric devices have been actively reduced in size, weight and size, such as high performance and miniaturization. Therefore, coils, which are important component elements used in the electric devices, have been made smaller and lighter year by year. There is. As the coil and the like are miniaturized, the operating temperature of the coil naturally rises, so that the insulated wire used for the coil also has high heat resistance. Under these circumstances, the use of highly heat-resistant materials for insulated wires has been increasing year by year. From conventional formal resin insulated wires, polyurethane resin insulated wires, and polyester resin insulated wires, polyester imide with higher heat resistance can be used. The use of resin insulated wires, polyamideimide overcoat polyesterimide resin insulated wires, polyamideimide resin insulated wires, polyimide resin insulated wires, etc. is increasing. This trend is expected to become more prominent in the future.

[0003]

Among such heat-resistant insulated electric wires, the polyamide-imide resin insulated electric wires, which are considered to be the most in demand, have a good balance of various characteristics and therefore have high reliability. It tends to be heavily used for required equipment. As described above, the polyamide-imide resin insulated wire has various excellent characteristics, but has the drawback that
It was inferior in adhesion to conductors, which was a cause of deterioration in flexibility and abrasion resistance. If this adhesion is improved, the polyamide-imide resin insulated wire can be further improved in flexibility and abrasion resistance.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, as a result of earnest research to improve the adhesion of the polyamide-imide resin to a conductor and to improve the abrasion resistance and flexibility of an insulated wire, polyamide The above object can be achieved by adding and reacting a trialkylamine to the imide resin solution. That is, the present invention provides a resin component 1 of a polyamideimide resin solution obtained by reacting a tricarboxylic acid anhydride with a diisocyanate and / or a diamine in a polar solvent.
Trialkylamine is added in an amount of 0.05 to 5 parts by weight.
The insulated wire is characterized in that a coating material obtained by adding and reacting 1.0 part by weight is applied and baked onto a conductor directly or through another insulating layer.

The polyamideimide resin solution used in the present invention is generally obtained by reacting a tricarboxylic acid anhydride with a diisocyanate or a diamine in a polar solvent. What was copolymerized by replacing with carboxylic dianhydride can also be used as the polyamide-imide resin. In addition, it is also possible to use the one obtained by substituting a part of the tricarboxylic acid anhydride with another acid or acid anhydride, for example, trimellitic acid, isophthalic acid, terephthalic acid, etc., to carry out the reaction. As the diisocyanate used in the present invention, 4,4'-diphenylmethane diisocyanate and tolylene diisocyanate are mainly used, but a part of the diisocyanate is replaced with another diisocyanate to slightly modify the resulting resin. May be. Also, instead of the diisocyanate component, diamine is separately used as an imide component,
There is also a method of introducing an imide bond and then performing amidation with diisocyanate. Next, the trialkylamine used in the present invention includes trimethylamine, triethylamine,
Tripropylamine, tributylamine and the like can be used, but trimethylamine and triethylamine are excellent in the effect of improving the adhesiveness and flexibility of the resulting resin.

The reason why the amount of trialkylamine added is limited to 0.05 to 1.0 parts by weight with respect to 100 parts by weight of the resin component in the polyamideimide resin solution is that the adhesion is improved when the amount is less than 0.05 parts by weight. This is because the effect is small, and the addition of more than 1.0 part by weight lowers the heat resistance of the obtained polyamide-imide resin film.

[0007]

[Function] By adding a small amount of trialkylamine to a polyamide-imide resin solution and reacting the mixture, the adhesion of the obtained polyamide-imide resin film to the conductor is improved, resulting in abrasion resistance and flexibility of the insulating film. The property has improved.

[0008]

EXAMPLES Next, the present invention will be described with reference to examples and comparative examples. Reference Example 1 Preparation of Polyamideimide Resin Coating A A 1046 g of N-methylpyrrolidone and 150 g of xylene were placed in a four-necked flask equipped with a stirrer, and the temperature was raised to 80 ° C. Then, under a nitrogen stream, the trimellitic anhydride 200g and ^4,4' over diphenylmethane diisocyanate 130g was poured contents was raised to 90 ° C., was reacted in refluxing 1 hour. Then put the 4, 4 ^{'over-diphenylmethane} diisocyanate 142g, 12
The temperature was raised to 0 ° C., heating was stopped when the content reached 10,000 centipoise (30 ° C.), and 174 g of N-methylpyrrolidone and 350 g of xylene were added to obtain a polyamideimide resin solution having a nonvolatile content of 22%. .

Reference Example 2 Preparation of Polyamideimide Resin Coating B Commercially available polyamideimide resin coating (manufactured by Hitachi Chemical Co., Ltd.,
The product name H-1406-nonvolatile matter 30%) was used.

Examples 1 to 4 and Comparative Examples 1 to 4 Trimethylamine and triethylamine were added to the polyamideimide resin solutions obtained in Reference Examples 1 and 2.
Were added and blended at room temperature at the blending ratio shown in (1) and stirred for 1 hour to obtain a polyamide-imide resin paint.

[0011]

[Table 1] The obtained resin coating material was applied and baked eight times using a die using an enameled wire baking coater with a furnace length of 4.5 m to obtain a polyamide-imide resin insulated electric wire having a film thickness of 35 μm. Table 2 shows the characteristics of each of the obtained polyamide-imide resin insulated wires.

[0012]

[Table 2] As is clear from Table 2, as compared with the polyamide-imide resin insulated wire of the comparative example, the polyamide-imide resin insulated wire of the present invention maintains high heat resistance and has good adhesion to the conductor.
Flexibility is greatly improved, and abrasion resistance is also improved.

[0013]

EFFECTS OF THE INVENTION The polyamide-imide resin insulated wire of the present invention has significantly improved adhesion to a conductor and flexibility while maintaining the high heat resistance of polyamide-imide resin.
In addition, the abrasion resistance is also improved, which is very useful in industry.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C09D 179/08 PMB 9285-4J

Claims (1)

[Claims] 1. A trialkylamine is added in an amount of 0.05 to 1.0 to 100 parts by weight of a resin content of a polyamideimide resin solution obtained by reacting a tricarboxylic acid anhydride with a diisocyanate and / or a diamine in a polar solvent. An insulated wire, characterized in that a coating material obtained by adding and reacting parts by weight is applied and baked directly on a conductor or through another insulating layer.