Insulated electric wire
According to one embodiment, an insulated electric wire is disclosed. The insulated electric wire includes a conductor and an insulating film formed on the conductor, the insulating film including a first layer of a first polyamideimide containing an adhesion improver, a second layer of a second polyamideimide obtained by reacting an isocyanate component containing 10 to 70 mol % in total of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate react with an acid component formed on the first layer, and a third layer of a polyimide formed on the second layer.
1. An insulated electric wire, comprising:
a conductor and an insulating film formed on the conductor, the insulating film comprising a first layer of a first polyamideimide containing an adhesion improver, a second layer of a second polyamideimide obtained by reacting an isocyanate component containing 2,4′-diphenylmethane diisocyanate, dimer acid diisocyanate and 4,4′-diphenyl methane diisocyanate with an acid component formed on the first layer, and a third layer of a polyimide formed on the second layer,
wherein the isocyanate component contains 10 to 70 mol % of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate, and 30 to 90 mol % of 4,4′-diphenylmethane diisocyanate, and
wherein with regard to a proportion of thicknesses of the first to third layers in relation to the total thickness of the insulating film, the first layer is 10 to 20% , the second layer is 10 to 75% , and the third layer is 10 to 75% .
2. The insulated electric wire according to claim 1 ,
wherein a glass transition point (Tg) of the first polyamideimide is 250 to 300° C.
3. The insulated electric wire according to claim 1 ,
wherein a glass transition point (Tg) of the second polyamideimide is 200to 270° C.
4. The insulated electric wire according to claim 1 ,
wherein the isocyanate component contains 30 to 60 mol % of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate.
5. The insulated electric wire according to claim 1 ,
wherein the acid component is selected from an aromatic tetracarboxylic acid dianhydride and an isomer thereof.
6. A insulated electric wire according to claim 1 ,
wherein the total thickness of the insulating film is 60 to 200 μm.
7. The insulated electric wire according to claim 1 ,
wherein the conductor is a rectangular conductor.
8. The insulated electric wire according to claim 1 ,
wherein the rectangular conductor has a rectangular cross section with a width of 2.0 to 7.0 mm and a height of 0.7 to 3.0 mm.
9. An insulated electric wire, comprising:
a conductor and an insulating film formed on the conductor, the insulating film comprising a first layer of a first polyamideimide containing an adhesion improver, a second layer of a second polyamideimide obtained by reacting an isocyanate component containing 2,4′-diphenylmethane diisocyanate, dimer acid diisocyanate and 4,4′-diphenylmethane diisocyanate with an acid component formed on the first layer, and a third layer of a polyimide formed on the second layer,
wherein. the isocyanate component contains 10 to 70 mol % of 2,4′- diphenvlmethane diisocyanate and dimer acid diisocyanate, and 30 to 90 mol % of 4,4′-diphenvImethane diisocyanate, and
wherein, with regard to a proportion of thicknesses of the first to third layers in relation to the total thickness of the insulating film, the first layer is 15 to 20%, the second layer is 55 to 75%, and the third layer is 15 to 30%.
10. The insulated electric wire according to claim 9 ,
wherein a glass transition point (Tg) of the first polvamideimide is 250 to 300° C.
11. The insulated electric wire according to claim 9 ,
wherein a glass transition point (Tg) of the second polvamideimide is 200 to 270° C.
12. The insulated electric wire according to claim 9 ,
wherein the isocyanate component contains 30 to 60 mol % in total of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate.
13. The insulated electric wire according to claim 9 ,
wherein the acid component is selected from an aromatic tetracarboxylic acid dianhydride and an isomer thereof.
14. A insulated electric wire according to claim 9 ,
wherein the total thickness of the insulating film is 60 to 200 μm.
15. The insulated electric wire according to claim 9 ,
wherein the conductor is a rectangular conductor.
16. The insulated electric wire according to claim 9
wherein the rectangular conductor has a rectangular cross section with a width of 2.0 to 7.0 mm and a height of 0.7 to 3.0 mm.