KR100879002B1 - Insulated wire comprising an insulating coating composition comprising polyamideimide and an insulating coating coated thereon - Google Patents

Abstract

The present invention relates to an insulated wire comprising an insulating coating composition comprising polyamideimide and an insulating coating coated thereon, wherein polyamideimide has an amide bond: imide bond ratio of 30:70 to 70:30 mol%. Thereby, abrasion resistance can be improved by adjusting the component ratio of the amide group in a polyamideimide, and it is excellent in plasticity and excellent in workability.

Polyamideimide * Abrasion Resistance * Plasticity * Insulated Wire

Description

Insulating varnish composition containing polyamideimide and Insulated wire containing insulated layer coated Technical Field

1 is a diagram illustrating the crosslinking density of a film coated with a general polyamideimide,

2 is a diagram showing the crosslinking density of a polyamideimide coated film using a polyfunctional blocked isocyanate.

The present invention provides an insulating coating composition comprising an insulating coating composition comprising a polyamideimide, and an insulating wire comprising an insulating coating coated thereon, and more particularly an insulating coating comprising a polyamideimide coating applied therein, the amide in the polyamideimide. It relates to an insulated wire comprising an insulating film coated with a polyamide imide excellent in plasticity by forming an insulating film that is excellent in plasticity and hardly damaged by modifying the amide-imide resin into a rigid structure by controlling the ratio of the imide component. .

Conventionally, slippery winding oil is added to the final process of wire coating or wound in order to eliminate the damage of the wire insulation film due to rapid winding during the manufacture of insulated wire used in industrial equipment such as electric motors or alternators. The speed of work was reduced to minimize defects. However, the problem of wire damage at the time of fast winding is difficult to be completely improved, and slip agents that impart slipperiness contained in the winding oil have a problem in adhesiveness with the impregnated varnish, so that the company has been reluctant to use it. Efforts have been made to eliminate the increase in production costs due to the slow speed.

In particular, in recent years, as all the electric devices mounted inside the vehicle become more complicated, lighter and smaller, efforts have been made to improve its workability.

The composition of the insulation coating applied to the high-abrasion polyamide imide insulated wire can satisfy the workability and abrasion at the same time, and this is the main component of the eco-friendly and future-oriented cars due to the miniaturization and lightweight of electric motors, which are recently required. Its application is possible, and its use range is not limited to automobiles, but it is highly applicable to various uses such as home appliances or industrial products using all electric devices used in daily life.

The recent technology tends to be smaller and lighter, and the motor is more compact and lighter in weight, but its performance is much higher than that of existing products. In order to satisfy this requirement, it is necessary to wind many insulated wires by the core of the motor, but the existing common wires strongly wrap the insulated wires in the slots of the core, and there is a danger of damaging the insulating film during the winding process. Big. In addition, when the insulation film is damaged, there is a problem that a layer defect or a defect is generated, which seriously affects the electrical characteristics of the motor.

Usually, the insulated wire which has the insulation film formed by application | coating and baking of polyamide-imide-type paint is used for the said use.

The polyamideimide is generally a reaction intermediate of carbamate (-OC) by isocyanate (-NCO) and an acid (Acid; -COOH) component or an anhydride (-CO-O-CO-). Carbon dioxide is generated as an adduct via -O-OC-N-OC, and an amide (-NHCO-) and imide (-OC-N-CO-) bond is formed.

In recent years, small size, light weight, and good performance motors are required to cope with this, and the amount of windings of the insulated wire tends to increase further, and the polyamide-imide-based insulating film is often damaged. In order to reduce the damage of the insulating film even a little, in general, additives such as organic or inorganic lubricants are added to the paint to impart lubricity to the surface of the insulating film, but this method alone can fundamentally damage the insulating film. Can't solve it.

Increasing the mechanical strength of the insulating film further reduces the problem of damaging the insulating film.However, only by increasing the mechanical strength, the film becomes rigid and inferior to plasticity, making it easy to crack or peel off when the wire is bent. Crack) occurs, and the workability of the insulated wire is further deteriorated.

Accordingly, the present inventors have been studying to solve various problems occurring in the insulated wire in which the insulating coating composition including the conventional polyamideimide is coated with an insulating coating, and the amide component and the imide component in the polyamideimide By adjusting the content ratio of ie, that is, by increasing the content of the amide component, it was found that not only the wear resistance was improved, but also the plasticity was improved and the workability was improved.

Therefore, an object of the present invention is to provide an insulating coating composition which is excellent in wear resistance and plasticity and which is not easily damaged, and which is excellent in workability.

Moreover, an object of this invention is also to provide the insulated wire containing the insulating film which apply | coated the said insulating coating composition.

In order to achieve the above object, the polyamide-imide insulating coating composition of the present invention is 60 to 90 mol% of the aromatic diisocyanate compound represented by the following general formula (1) of the total diisocyanate component, triylene diisocyanate represented by the following general formula (2) (TDI) 10 to 40 mol%, 10 to 30 mol% of dicarboxylic acid, 70 to 90 mol% of acid anhydride and 3 or more functional groups of the total acid component is provided.

Moreover, this invention provides the insulated wire containing the insulating film which apply | coated the said insulating coating composition.

Hereinafter, the present invention will be described in more detail.

The present invention relates to an insulated wire comprising an insulating coating composition comprising polyamideimide and an insulating coating formed by applying the same.

The insulating coating composition of the present invention contains polyamideimide as a main material, and includes various additives which are usually added to solvents and other coating compositions.

The polyamideimide of the present invention is in accordance with a conventional production method, specifically by reaction of a diisocyanate component with an acid component or an acid anhydride. In particular, the present invention is characterized by adjusting the amide component and imide component ratio in the polyamideimide in order to obtain desired physical properties.

The diisocyanate component used in the preparation of the polyamideimide of the present invention contains an aromatic diisocyanate compound represented by the following formula (1) in 10 to 90 mol% of the total diisocyanate component.

In the above formula, R ₁ and R ₂ are the same as or different from each other, and each represent a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom.

Specific examples of the aromatic diisocyanate compound represented by Formula 1 include biphenyl-4,4'-diisocyanate, biphenyl-3,3'-diisocyanate, biphenyl-3,4'-diisocyanate, 3 , 3'-dimethylbiphenyl-4,4'-diisocyanate, 3,3'-diethylbiphenyl-4,4'-diisocyanate, 2,2'-dimethylbiphenyl-4,4'-di Isocyanate, 2,2'-diethylbiphenyl-4,4'-diisocyanate, 3,3'-dimethoxybiphenyl-4,4'-diisocyanate, 2,2'-dimethoxybiphenyl-4, 4'- diisocyanate etc., These can be used individually or in mixture of 2 or more types.

Further, other diisocyanates that can be mixed with the aromatic diisocyanate compound include diphenylmethane-4,4'-diisocyanate, diphenylmethane-3,3'-diisocyanate, diphenylmethane, 3,4 ' -Diisocyanate, diphenyl ether-4,4'- diisocyanate, benzophenone-4,4'- diisocyanate, diphenylsulfone-4,4'- diisocyanate, triylene-2,4-diisocyanate, tril Lene-2,6-diisocyanate, m-xylene diisocyanate, p-xylene diisocyanate, naphthalene-2,6-diisocyanate, 4,4 '-[2,2-bis (4-phenoxyphenyl ) Propane] diisocyanate, tetramethylene-1,4-diisocyanate, hexamethylene-1,6-diisocyanate, etc. are mentioned.

The ratio of the aromatic diisocyanate compound represented by the formula (1) is preferably included in the range of 10 to 90 mol% of the total diisocyanate component, when less than 10 mol% has less effect of wear resistance properties, 90 mol% If exceeded, the content of the rigid structure in the chain is too high, the plasticity is lowered, there may be a problem such as cracks.

In addition, in the present invention, the isocyanate component, in addition to the aromatic diisocyanate compound, may be due to the characteristics of wear resistance and plasticity using an isocyanate having a methyl group having a structure bent in the molecule. As a representative example, when the triylene-diisocyanate (TDI) represented by the following formula (2) is used, the molecular length is shorter than that of diphenylmethane-4,4'-diisocyanate (MDI), which is generally used, and thus has a rigid structure. It can be improved, and plasticity can be compensated by having a structure in which two isocyanates are bent in the benzene ring.

It is preferable to contain the trilene diisocyanate of the said curved structure in 10 to 40 mol% of all the diisocyanate components. When less than 10 mol%, the effect is hard to expect, and when it exceeds 40 mol%, a rigid structure will increase and it will be inferior to plasticity, and will be easy to crack or peel off.

Preferably, it is preferable to use the diisocyanate compound containing 60-90 mol% of aromatic diisocyanate compounds represented by the said Formula (1), and 10-40 mol% of isocyanate compounds which have a structure bent in a molecule | numerator.

In addition, the diisocyanate component of the present invention may include a polyfunctional isocyanate compound represented by the following formula (3).

Wherein R is an organic group containing an aromatic group.

Specific examples of the polyfunctional isocyanate compound represented by Formula 3 include CT-Stable, Polymellic MDI, and the like. As can be seen in Figures 1 and 2, when the polyfunctional isocyanate compound as described above compared to the crosslinking density of the coating film from a general polyamideimide, it can be seen that the crosslinking density increases during coating, such crosslinking It is possible to solve the problem of lowering heat resistance by improving the density. In addition, when the polyfunctional isocyanate compound is used, mixing is possible at room temperature, and thus excellent workability.

On the other hand, the present invention can adjust the content ratio of the amide bond and the imide bond component in the polyamideimide, it is preferable that the ratio of the composition is contained within the range between 30:70 ~ 70:30 mol%.

The amide structure has significantly superior characteristics in the wear resistance than the imide structure. Generally, the ratio of the amide structure to the component ratio composition of the amide component and the imide is generally designed to be 50:50. However, the wear resistance can be improved by increasing the amide group in the molecular structure. In this case, the application ratio is 30:70 to 70:30 mol% in the amide bond and imide bond composition. It is desirable to apply within the range between. If the amide structure exceeds 70 mol%, the thermal properties will be degraded. In addition, when the imide structure is 70% or more, plasticity is lowered, which inhibits processing characteristics such as bending. That is, by combining the amide structure and the imide structure on the resin structure, physical properties such as abrasion resistance and porosity of the amide structure and thermal properties such as softening of the imide structure can be appropriately adjusted.

In the preparation of the polyamideimide of the present invention, it is preferable to use dicarboxylic acid or dianhydride having two carboxyl groups represented by the following general formula (4) as the acid component or acid anhydride component, which is equivalent to diisocyanate. This is because it can increase the component ratio of the amide while reacting with. Examples of such dicarboxylic acids are from the group consisting of terephthalic acid, isophthalic acid, adipic acid, fumaric acid, sebacic acid, and succinic acid. It is selected. By increasing the number of amide groups in the polyamideimide structure, the abrasion effect can be increased.

Where A is a C2-C12 hydrocarbon.

As described above, the problem of lowering the heat resistance according to the use of an acid component including an acid at both ends can be solved by using the polyfunctional blocked isocyanate.

In addition, although the carboxylic group is substituted at the position of para with respect to A (for example, a benzene ring), such dicarboxylic acid is a part for improving the plasticity of the insulating film of this invention. It is also possible to use dicarboxylic acids in which is substituted at the ortho or meta position. The dicarboxylic acid compound contains an acid having a structure that is bent on a molecular structure, and the acid component is contained in an acid component as a raw material, thereby forming a bent portion due to the acid component in the polyamideimide structure, thereby improving plasticity of the cutting film. do.

Acid anhydrides of the present invention also include acid anhydrides such as trimellitic anhydride (TMA) and pyromellitic anhydride (PMDA), BTDA (3.3 ', 4.4'-Benzophenone tetracarboxylic dianhydride), BPDA (3.3', 4.4'-Biphenyl tetracarboxylic acid dianhydride) When using an dianhydride such as, it is preferable to use a dianhydride in order to effectively control the content (mol%) of the amide bond and the imide bond.

In the production of the polyamideimide, it is possible to copolymerize the diisocyanate component with an acid component or an acid anhydride in a suitable organic solvent and employ a production method similar to a conventional polyamideimide paint. Although it does not specifically limit as said organic solvent, It is preferable to use polar solvents, such as N-methyl- 2-pyrrolidone, N, N- dimethyl formamide, and xylene.

When the diisocyanate component blended with the aromatic diisocyanate compound using the above composition is reacted for 1 to 24 hours in an acid component or an acid anhydride and a suitable organic solvent at a temperature of 0 to 180 ° C., the diisocyanate component and the acid component or acid anhydride The polyamide-imide insulating coating composition obtained by dissolving or dispersing polyamideimide in an organic solvent can be obtained.

The polyamideimide of the present invention is included in 10 to 100% by weight of the total insulating coating composition, but is not limited thereto.

Such an insulating coating composition may of course include solvents, organic and inorganic substances and other additives contained in conventional coating compositions.

On the other hand, the present invention includes an insulated wire comprising an insulating coating obtained by applying the insulating coating composition containing the polyamideimide to the surface of the electric wire.

The insulated wire of this invention is manufactured by apply | coating the said polyamide-imide coating material to the surface of an electric wire, and baking an solvent and forming an insulating film.

The thickness of the insulating coating applied to the surface of the electric wire is not particularly limited in the present invention, and may be changed depending on the use of the insulating wire used.

The base material of an insulating film can also be provided with the base material layer from the favorable material of adhesiveness with this insulating film and an electric wire. As such a base material layer (primary coating layer: adhesion varnish), application of various conventionally known insulating paints such as polyurethane, polyester, polyesterimide, polyesteramideimide, polyamideimide, and polyimide And an insulating film formed by baking. Among them, the polyamideimide-based coatings containing diphenylmethane methane-4-4'-diisocyanate and trimellitic anhydride are applied and baked from the viewpoints of heat resistance with the wires and the insulating coating, or mechanical strength of the coating. Base layer is good.

In order to provide lubricity to the surface of an insulating film, the upper layer of an insulating film may have a surface lubricating layer. As the surface lubricating layer, paraffins such as liquid paraffin and solid paraffin can be used. However, in view of durability, a surface lubricating layer obtained by applying various lubricants such as wax, polyethylene, fluorine resin and silicone resin to the binder resin is more preferable. Do.

Hereinafter, the present invention will be described in more detail with reference to the following Examples, but the present invention is not limited thereto.

Example 1

96.06 g (0.5 mole) of trimellitic anhydride (hereinafter referred to as TMA) and 87.25 g (0.4 mole) flowing 150 ml of nitrogen gas per minute into a flask equipped with a thermometer, a cooling tube, a calcium chloride filling tube, a stirrer and a nitrogen injection tube. Pyromellitic dianhydride (hereinafter referred to as PMDA) and 16.61 g (0.1 mol) of terephthalic acid (hereinafter referred to as TPA)

The ratio of TMA: PMDA: TPA was 50:40:10 mol%. And 221.66 g (0.9 mol) of 3,3'-dimethylbiphenyl-4,4'-diisocyanate (hereinafter referred to as TODI) and triylene-diisocyanate (hereinafter referred to as TDI) as the isocyanate. (0.1 mol) was added. The ratio of all the diisocyanates in the TODI is 90 mol%.

Next, 637 g of N-methyl-2-pyrrolidone was added to the flask and heated to 85 ° C. for 2 hours while stirring with a stirrer, held for 3 hours, and then heated to 130 ° C. for 1 hour, and then the viscosity was increased. Observed. After 1 hour, the heating was stopped, and N-methyl-2-pyrrolidone, xylene, and N, N-dimethylformamide solvents were sequentially added and stirred, followed by cooling to obtain 23% of polyamideimide paint. Got it. The content ratio of the amide component: imide component in the obtained polyamideimide was 35:65 mol%. This polyamide-imide paint was applied and baked on a copper wire surface having a diameter of 1.0 mm in accordance with ordinary conditions to produce an insulated wire having an insulating film having a thickness of 35 µm.

Example 2

128.90 g (0.4 mole) of biphenyltetracarboxylic dianhydride (hereinafter referred to as BTDA) was added instead of PMDA to make 50:40:10 mole% of TMA, BTDA and TPA in the total acid component. Obtained the polyamide-imide paint according to the same method as in Example 1. The content ratio of the amide component: imide component in the obtained polyamideimide was 35:65 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 3

117.69 g (0.4 mol) of benzophenone tetracarboxylic dianhydride (hereinafter referred to as BPDA) was added instead of PMDA, and the ratio of TMA, BPDA and TPA in the total acid components was 50:40:10 mol%. Obtained the polyamide-imide paint according to the same method as in Example 1. The content ratio of the amide component: imide component in the obtained polyamideimide was 35:65 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 4

According to the same method as in Example 1, except that 66.46 g (0.4 mol) of IPA was added using only isophthalic acid (hereinafter referred to as IPA) and TMA to make the ratio of TMA and IPA 60:40 mol%. Polyamide-imide paint was obtained. The content ratio of the amide component: imide component in the obtained polyamideimide was 70:30 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 5

66.46 g (0.4 mol) of TPA was added, and the polyamide-imide coating material was obtained by the same method as Example 1 except having changed the ratio of TMA and TPA into 60:40 mol%. The content ratio of the amide component: imide component in the obtained polyamideimide was 70:30 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 6

In Example 1, the doses of TODI and TDI were changed to TODI = 185.00 g (0.7 mol) and TDI = 52.25 g (0.3 mol), so that the ratio of TODI in the total isocyanate was 70 mol%, and TMA = 172.91 g. Polyamide-imide paint was obtained in the same manner as in Example 1 except that (0.90 mol) and TPA = 16.61 (0.1 mol) were used. The content ratio of the amide component: imide component in the obtained polyamidimide was 55:45 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 7

Polyamideimide-based paint in the same manner as in Example 6 except that TODI = 1.15 g (0.5 mol) and TDI = 87.08 g (0.5 mol), and the ratio of TODI in the total isocyanate was 50 mol%. Got. The content ratio of the amide component: imide component in the obtained polyamideimide was 55:45 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 8

In Example 1, a polyamide-imide paint was obtained in the same manner as in Example 1, except that 172.91 g (0.9 mol) of TMA and 16.61 g (0.1 mol) of TPA were used. The content ratio of the amide component: imide component in the obtained polyamideimide was 55:45 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 9

In Example 1, except that 182.51 g (0.95 mole) of TMA and 8.31 g (0.05 mole) of TPA were used, the polyamide-imide paint was obtained in the same manner as in Example 1. The content ratio of the amide component: imide component in the obtained polyamideimide was 52.5: 47.5 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 10

In Example 1, a polyamide-imide paint was obtained in the same manner as in Example 6, except that 144.09 g (0.75 mol) of TMA and 41.54 g (0.25 mol) of TPA were used. The content ratio of the amide component: imide component in the obtained polyamideimide was 62.5: 37.5 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 11

In Example 1, except for using 172.91 g (0.9 mole) of TMA, 16.61 g (0.1 mole) of TPA and 158.57 g (0.6 mole) of TODI, 69.66 g (0.4 mole) of TDI, A polyamide-imide paint was obtained in the same manner as in Example 1. The content ratio of the amide component: imide component in the obtained polyamideimide was 55:45 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Example 12

An insulated wire was prepared in the same manner as in Example 1 except that polyfunctional isocyanate (CT-STABLE) was added 5% of SOLID to the insulating paint obtained in Example 11.

Comparative Example 1

Polyamideimide was prepared in the same manner as in Example 1, except that 264.29 g (1.0 mole) of TODI and 192.12 g (1.0 mole) of TMA were used using only TODI and TMA as synthetic raw materials when preparing a polyamide-imide paint. System paint was obtained. The content ratio of the amide component: imide component in the obtained polyamideimide was 50:50 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Comparative Example 2

Polyamideimide was prepared in the same manner as in Example 1, except that 250.26 g (1.0 mole) of MDI and 192.12 g (1.0 mole) of TMA were used using only MDI and TMA as synthetic raw materials when preparing a polyamide-imide paint. System paint was obtained. The content ratio of the amide component: imide component in the obtained polyamideimide was 50:50 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

Comparative Example 3

Use only TODI, TDI, and TMA as synthetic raw materials when manufacturing polyamide-imide paint A polyamide-imide paint was obtained in the same manner as in Example 1, except that 79.29 g (0.3 mol) of TODI, 121.91 g (0.7 mol) of TDI, and 192.12 g (1.0 mol) of TMA were used. The content ratio of the amide component: imide component in the obtained polyamideimide was 50:50 mol%. In addition, an insulated wire was produced in the same manner as in Example 1 using the polyamide-imide paint.

The following physical properties were tested for the insulated wires prepared according to the above Examples and Comparative Examples, and the results are shown in Table 1 below.

-Appearance evaluation: The appearance of each insulated wire was visually observed.

-Insulation breakdown voltage: Insulation breakdown was measured according to KS C 3006,11. The voltage rises at the same rate as possible at a rate of approximately 500 V / s and the breakdown voltage value is measured. However, if it is destroyed within 5 seconds, lower the speed of the boost and measure it to be destroyed more than 5 seconds.

In this experiment, the experiment is conducted by the two-line twisting method, and the method is as follows. Take three test pieces of about 50cm in length from the same bobbin, fold each of them in two pieces, apply a tensile force specified in KS standard to the ends of the wire, twist the part of length about 12cm with the twist number specified in KS standard, and remove the tensile force. Cut off the fold and apply AC voltage close to sine wave of 60Hz. In addition, the capacity of the transformer used in this experiment is 500VA or more.

-Plasticity test: For each insulated wire, observe the breakdown or peeling of the insulation film when the wire is bent in order to correspond to the outer shape of the round rod, in order to plural round bars that increase in diameter step by step from 1.0mm in diameter to 1mm. The diameter d (mm) of the minimum round bar which an abnormality is seen in the film was recorded.

-One-way wear test: The load damaged by the insulation film was recorded in the one-way wear test in which the piano wires orthogonal to each insulated wire were superimposed and the piano wires were loaded with various weights.

-Test for softening resistance: Each insulated wire was carried out by the cross method in accordance with KS C 3006.The test was applied with an AC voltage of 100 V close to 60 sine wave between the conductors or between the conductors and the steel balls, respectively. The thermocouple is fixed to the part closest to the sample by measuring the temperature by raising the temperature at the ratio of. The short circuit current at that time is 5-20 mA.

Coating appearance Insulation Breakdown Voltage Plasticity (d) Abrasion (g) Softening resistance (℃) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Comparative Example 1 Comparative Example 2 Comparative Example 3 Good good good good good good good good good good good good good good good good 9.5 10.0 10.5 11.0 9.5 11.5 11.0 10.0 11.5 12.5 13.0 12.5 12.5 11.5 12.0 3 3 3 2 1 2 1 2 2 1 1 1 3 1 1 1123 1090 1111 2230 2142 1814 1892 2203 2145 2153 2244 2256 1778 1202 1489 478 465 466 389 405 435 423 426 414 410 418 443 386 402 409

As described in detail above, in an insulated wire including an insulated coating coated with polyamideimide, the polyamideimide resin in which the amide component and the imide component ratio is controlled is deformed into a rigid structure to have excellent plasticity and hard to be damaged. The present invention relates to an insulated wire comprising an insulating film coated with polyamideimide having excellent porosity.

Claims (8)

delete A polyamideimide insulating coating composition comprising a polyamideimide, which is a copolymer comprising a diisocyanate component, an acid component or an acid anhydride, and three or more polyfunctional blocked isocyanate components, wherein the polyamideimide is represented by the following Chemical Formula 1 in the entire diisocyanate component: 60 to 90 mol% of aromatic diisocyanate compounds represented by the above, 10 to 40 mol% of triylene-isocyanates (TDI) represented by the following Chemical Formula 2, and 10 to 30 mol% of the dicarboxylic acids represented by the following Chemical Formula 4 among all acid components , 70-90 mol% of acid anhydrides, and polyfunctional blocked isocyanates having three or more functional groups are reacted, and the ratio of amide bonds: imide bonds in the polyamideimide is 30: 70-70: 30 mol%. Polyamideimide Insulating Paint Composition: Formula 1

Wherein R ₁ and R ₂ are the same as or different from each other, and each represent a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom; Formula 2

Formula 4

Wherein A is a hydrocarbon having 2 to 12 carbon atoms. delete delete delete delete delete An insulated wire comprising an insulating coating coated with the insulating coating composition of claim 2.

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