JPH02207409A - Self-welding insulated wire - Google Patents

Abstract

PURPOSE:To improve refrigerant resistance, flexibility and heat resistance by providing a welding insulated layer which is made by applying and baking specified paint on a conductor directly or via the layer of other insulated material. CONSTITUTION:A welding insulated layer, made by applying and baking paint which is combined with 100 polyetherimido resin shown by wt. in a formula, 5-40 urethane prepolymer and 20-200 polyhydroxyether resin which is composed of tetrabromibisphenol (A) and bisphenol (A) and epichlorohydrine and has an average molecular wt. of 10000 or more, is provided on a conductor directly or via the layer of other insulated material. As a result, the property of polythane prepolymer portion is demonstrated for heat and refrigeration, and the property of polyhydroxyether resin portion is demonstrated for stress such as bending.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a self-bonding insulated wire.

[Prior Art and its Problems] In recent years, demand for self-bonding insulated wires has increased as the coil processing process becomes more rational and labor-saving because it is easy to fix after the coil winding process. Therefore, the use of self-bonding insulated wires has expanded not only to small transformers and small motors, but also to devices such as large transformers and motors that are subject to vibration and are exposed to high temperatures. There is.

However, conventional self-fusing insulated wires include phenoxy resin, polyvinyl butyral resin, etc. in the fusing resin insulation layer.
Thermoplastic resin such as polyamide resin is used. In particular, when an insulated wire with a fused resin insulating layer formed only of these thermoplastic resins is used in an electric motor or the like, the resin is destroyed by vibration and high temperature, causing the problem that the coil comes apart. Therefore, the use of conventional self-bonding insulated wires has been limited to equipment that operates at temperatures that do not exceed the heat resistance temperature of the thermoplastic resin used. Furthermore, when using conventional self-bonding insulated wires for hermetic motors such as refrigerators,
There was a problem that the thermoplastic resin could not be used because of its poor refrigerant resistance.

To solve this problem, we have developed a self-bonding insulated wire in which the coated fusion resin insulating layer is semi-cured, that is, in a B stage state, and the fusion layer is fused and completely cured by heating during coil forming. Proposed.

However, this self-bonding insulated wire has flexibility,
It had the disadvantage of poor windability and shelf life.

The present invention has been made in view of these points, and provides a self-bonding insulated wire that has excellent refrigerant resistance, flexibility, and heat resistance.

[Means for Solving the Problems] The present invention provides 5 to 40 parts by weight of a urethane prepolymer, tetrabromobisphenol A, bisphenol A, and epichlorohydrin to 100 parts by weight of a polyetherimide resin represented by the following formula. A fusible insulating layer formed by coating and baking a paint containing 20 to 200 parts by weight of a synthesized polyhydroxyether resin with an average molecular weight of 10,000 or more is provided directly on the conductor or via another insulating layer. This is a self-bonding insulated wire characterized by the following.

General Formula Here, the polyetherimide resin that is the first component used in the fusible insulating layer of the present invention is represented by the following structural formula, and is manufactured by GE Corporation in the United States under the trade name "Ultem". It is commercially available as.

Structural formula Structural formula In addition, the second component, the urethane prepolymer, is
It is shown by the following structural formula, and is an oligomer obtained by reacting a polyvalent isocyanate and a polyhydric alcohol. This can be obtained, for example, by heating MS-50 (manufactured by Nippon Polyurethane Co., Ltd., trade name) and glycerin as a catalyst in the presence of zinc octylate. Specifically, a urethane polymer consisting of 4,4'-diphenylmethane diisocyanate and glycerin is preferred;
Other various combinations of prepolymers can also be used.

Further, the polyhydroxyether resin synthesized from the third component, tetrabromobisphenol A, bisphenol A, and epichlorohydrin, has an average molecular weight of 10,000 or more as shown in the following structural formula. For example, YP843C (trade name, manufactured by Tobu Kasei Co., Ltd.) is a commercially available product.

Structural formula (where fl and r are positive buttons) This hydroxyether resin has an average molecular weight of 10
000 or more is because if less than 10,000 is used, the resulting self-bonding insulated wire will not have sufficient flexibility. Also, the ratio of Nor in the formula is 1:5
It can be arbitrarily selected within the range of ~1:1.

In the present invention, the blending amount of the urethane prepolymer is 5 to 40 parts by weight per 100 parts by weight of the polyetherimide resin.
The weight part is based on the amount of urethane prepolymer added to 5.
If the amount is less than 40 parts by weight, the polyetherimide resin and polyhydroxyether resin will not be sufficiently crosslinked and cured, and the resulting fusible insulating layer will not exhibit sufficient heat resistance and refrigerant resistance. This is because if the amount exceeds 1 part by weight, the resulting fusible insulating layer will not exhibit sufficient flexibility.

In addition, the amount of polyhydroxyether resin blended is 20 to 200 parts by weight per 100 parts by weight of polyetherimide resin.
This is because if the amount of polyhydroxyether resin blended is less than 20 parts by weight, the resulting fusible insulating layer will not exhibit sufficient flexibility and the temperature required for adhesion will be high. This is undesirable from a practical standpoint, and if the amount exceeds 200 parts by weight, the resulting fusible insulating layer will not exhibit sufficient heat resistance and refrigerant resistance.

[Function] According to the self-bonding insulated wire of the present invention, the fusible insulating layer is made of a urethane prepolymer having excellent heat resistance and refrigerant resistance, and a polyhydroxy ether resin having excellent flexibility. It is moderately crosslinked with etherimide resin. Therefore, it is possible to exhibit the properties of a part of the urethane prepolymer against heat and coolant, and to exhibit the properties of the polyhydroxyether resin part against stress such as bending.

[Example] Next, the present invention will be specifically explained with reference to Examples.

Example 1 100ffiff of a 30% cresol solution of Ultem (manufactured by GE, USA, trade name) as a polyetherimide resin.
Part i, 5 parts by weight of a 30% cresol solution of MS-50 (manufactured by Nippon Polyurethane Industries Co., Ltd., trade name) as a urethane prepolymer, and Y as a polyhydroxyether resin.
20 parts by weight of a solution of P843C (manufactured by Tobu Kasei Co., Ltd., trade name, solid content 30%) was placed in a flask and stirred while heating at 80°C for 30 minutes to obtain a self-fusing resin paint. .

The urethane prepolymer was prepared in advance by placing xylenol as a solvent, 100 parts by weight of MS-50, and 12 parts by weight of glycerin as catalysts together with zinc octylate in a flask, and heating and stirring at 120°C for 4 hours. It was adjusted.

Next, the obtained self-adhesive resin paint was applied onto an insulated copper wire having a diameter of 0.65 mm, which had been coated with a polyesterimide resin on an annealed copper wire, and baked. In addition, the length of baking is 3
The sample was passed through a furnace with a furnace temperature of 300'C and a linear velocity of 12 m/min. This process was repeated three times to obtain a self-bonding insulated wire (Example 1) of the present invention.

This self-bonding insulated wire was subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test. The results are shown in Table 1 below.

In addition, in the adhesive strength test, the insulated wire to be tested was tightly wound around a metal round bar with a diameter of 5.0 m + s, and the length was 80 mm.
A helical coil of
The adhesive strength at ℃ was measured.

In addition, in the flexibility test, the insulated wire to be tested is
The number of cracks generated in the coating layer was determined by winding the coating layer for 10 turns (0.65 m+s).

Moreover, the refrigerant extraction test was conducted as follows.

First, 2 g of the coating layer of the insulated wire to be tested is taken, washed with Freon R-113, and then the collected coating layer is heated at 150° C. for 1 hour. This has an internal volume of 450
200g Freon R-22 in a cc autoclave
The autoclave is then cooled to evaporate and extract Freon.

After that, the weight of the coating layer is measured, and the extraction rate is calculated using the following formula.

Extraction rate - weight of coating layer after extraction (g) x 100/
2 Example 2 100 parts by weight of a 30% cresol solution of Ultem as a polyetherimide resin, 5 parts by weight of a 30% cresol solution of MS-50 as a urethane prepolymer, and 50 parts by weight of a solution of YP843C as a polyhydroxyether resin. The mixture was placed in a flask and stirred while heating at 80° C. for 30 minutes to obtain a self-adhesive resin coating. The urethane prepolymer was prepared by placing it in a flask together with zinc octylate using xylenol as a solvent, 100 parts by weight of MS-50 and 12 parts by weight of glycerin as a catalyst.
The mixture was prepared in advance by stirring at 20° C. for 4 hours while heating.

Next, the obtained self-adhesive resin paint was applied onto an insulated copper wire having a diameter of 0.65 mm, which had been prepared by coating an annealed copper wire with a polyesterimide resin, and baked.

The baking was performed by passing the film through a furnace having a length of 3 m s and an internal temperature of 300° C. at a linear speed of 12 m/min. This process was repeated three times to obtain a self-bonding insulated wire (Example 2) of the present invention.

This self-bonding insulated wire was subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test in the same manner as in Example 1. The results are also listed in Table 1.

Example 3 100 parts by weight of a 30% cresol solution of Ultem as a polyetherimide resin, 15 parts by weight of a 30% cresol solution of MS-50 as a urethane prepolymer,
100 parts by weight of a solution of YPB43C as a polyhydroxyether resin was placed in a flask and stirred while heating at 80°C for 30 minutes to obtain a self-fusing resin paint.

The urethane prepolymer was made by using xylenol as a solvent, 100 parts by weight of MS-50, and 12 ff of glycerin.
i parts were placed in a flask together with zinc octylate as a catalyst, and stirred while heating at 120°C for 4 hours to prepare in advance.

Next, the obtained self-adhesive resin paint was applied onto an insulated copper wire having a diameter of 0.65 mm, which had been prepared by coating an annealed copper wire with a polyesterimide resin, and baked.

The baking was performed by passing the film through a furnace having a length of 3 ms and an internal temperature of 300° C. at a linear speed of 10 m/min. This process was repeated three times to obtain a self-bonding insulated wire (Example 3) of the present invention.

This self-bonding insulated wire was subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test in the same manner as in Example 1. The results are also listed in Table 1.

Example 4 100 parts by weight of a 30% cresol solution of Ultem as a polyetherimide resin, 35 parts by weight of a 30% cresol solution of MS-50 as a urethane prepolymer,
200 parts by weight of a solution of YP843C as a polyhydroxyether resin was placed in a flask and stirred while heating at 80° C. for 30 minutes to obtain a self-fusing resin paint. The urethane prepolymer was made by using xylenol as a solvent, 100 parts by weight of MS-50, and 12f glycerin.
1 part of fij was placed in a flask together with zinc octylate as a catalyst, and stirred while heating at 120°C for 4 hours.
Adjusted in advance.

Next, the obtained self-adhesive resin paint was applied onto an insulated copper wire having a diameter of 0.65 mm, which had been prepared by coating an annealed copper wire with a polyesterimide resin, and baked.

The baking was performed by passing the film through a furnace having a length of 3 m s and an internal temperature of 300° C. at a linear speed of 12 m/min. This process was repeated three times to obtain a self-bonding insulated wire (Example 4) of the present invention.

This self-bonding insulated wire was subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test in the same manner as in Example 1. The results are also listed in Table 1.

Comparative Example 1 100 parts by weight of a 30% cresol solution of Ultem as a polyetherimide resin and 100 parts by weight of a solution of YP843C as a polyhydroxyether resin were placed in a flask and stirred while heating at 80°C for 30 minutes. ,
A self-fusing resin paint was obtained.

Next, the obtained self-adhesive resin paint was applied onto an insulated copper wire having a diameter of 0.65 mm, which was prepared by coating an annealed copper wire with a polyesterimide resin, and baked.

The baking was performed by passing the film through a furnace having a length of 3 m s and an internal temperature of 300° C. at a linear speed of 12 m/min. This process was repeated three times to obtain a self-bonding insulated wire (Comparative Example 1).

This self-bonding insulated wire was subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test in the same manner as in Example 1. The results are also listed in Table 1.

Comparative Example 2 100 parts by weight of a 30% cresol solution of Ultem as a polyetherimide resin, 50 parts by weight of a 30% cresol solution of MS-50 as a urethane prepolymer,
14 parts by weight of a solution of YP843G as a polyhydroxyether resin was placed in a flask and heated at 80°C for 30 minutes.
A self-adhesive resin paint was obtained by stirring while heating. The urethane prepolymer was prepared by putting xylenol as a solvent, 100 parts by weight of MS-50 and 12 parts by weight of glycerin in a flask together with zinc octylate, and
The mixture was prepared in advance by stirring at 120° C. for 4 hours while heating.

Next, the obtained self-adhesive resin paint was applied onto an insulated copper wire having a diameter of 0.65 mm, which had been prepared by coating an annealed copper wire with a polyesterimide resin, and baked.

The baking was performed by passing the film through a furnace having a length of 3 m s and an internal temperature of 300° C. at a linear speed of 14 m/min. This process was repeated three times to obtain a self-bonding insulated wire (Comparative Example 2).

This self-bonding insulated wire was subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test in the same manner as in Example 1. The results are also listed in Table 1.

Comparative Example 3 An insulated copper wire with a diameter of 0.65mm, which was prepared by coating polyesterimide resin on an annealed copper wire, was tightly wound around a metal round bar with a diameter of 5.0mm, and the length was 80mm! I created a +111 helical coil. Thereafter, it was impregnated into epoxyphenol-impregnated varnish PD923 (manufactured by George, Inc., P, D, USA, trade name) and cured by heating at 160° C. for 3 hours to obtain an insulated wire (Comparative Example 3).

This insulated wire was subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test in the same manner as in Example 1. The results are also listed in Table 1.

As is clear from Table 1, the self-bonding insulated wires of Examples 1 to 4 of the present invention were excellent in adhesive strength, flexibility, and refrigerant resistance at high temperatures. On the other hand, the self-bonding insulated wire that does not contain urethane prepolymer (Comparative Example 1) has weak adhesive strength at high temperatures, and the self-bonding insulated wire that contains an amount of urethane prepolymer that exceeds the scope of the present invention has weak adhesive strength at high temperatures. The insulated wire (Comparative Example 2) has poor flexibility, and the insulated wire (Comparative Example 3) that does not contain any of the components of the present invention has weak adhesive strength at high temperatures and poor refrigerant resistance. I understand.

[Effects of the Invention] As explained above, the self-bonding insulated wire of the present invention has remarkable effects such as excellent refrigerant resistance, flexibility, and heat resistance.

Applicant's agent: Patent attorney Takehiko Suzue

Claims (1)

[Scope of Claims] Synthesized from 5 to 40 parts by weight of urethane prepolymer, tetrabromobisphenol A, bisphenol A, and epichlorohydrin, with respect to 100 parts by weight of polyetherimide resin represented by the following general formula, and has an average molecular weight of 10,000. A self-fusing insulating layer formed by coating and baking a paint containing 20 to 200 parts by weight of the above polyhydroxyether resin is provided on the conductor directly or via another insulating layer. Adhesive insulated wire. General formula▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, n is an integer from 10 to 100)