JPH06275128A - Resin composition for electric insulation and insulated wire - Google Patents

Abstract

PURPOSE:To provide a resin composition for electric insulation for providing excellent appearance and sliding property of an insulated wire, indicating good dispersion of lubricant by adding tetrafluoroethylene and specific ammonium salt. CONSTITUTION:A resin composition for electric insulation comprises 0.1-10 parts wt. of tetrafluoroethylene and 0.1-10 parts wt. of ammonium salt expressed as formula CF3(CF2)n-COONH4, where (n) is an integer from 1 to 20, added to resin 100 parts wt. of synthetic resin paint for electric insulation. The resin composition is directly painted and baked on a conductor or through another insulated substance, to provide an insulated wire. An enameled wire of good appearance, sliding property and antifriction can thus be provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a resin composition for electric insulation and an insulated wire.

[0002]

2. Description of the Related Art Conventionally, insulated electric wires (hereinafter abbreviated as enamel wires) obtained by applying and baking synthetic resin paints such as polyvinyl formal, polyurethane, polyester, polyester imide and polyamide imide on conductors are It is used in various applications such as motors and transformers according to its characteristics. In recent years, electric manufacturers using enameled wires have introduced automatic high-speed winding machines to streamline the equipment manufacturing process. There is a problem in that mechanical damage is caused to the layers, a layer short circuit or a ground failure occurs, and the defective rate of the product increases. Therefore, there has been a demand for an enameled wire with less lubrication and less mechanical damage.

Usually, since the enameled wire alone is poor in slipperiness, liquid enameled paraffin, solid paraffin, insulating oil, wax or the like is applied on the enameled wire, or nylon or the like having excellent mechanical strength and abrasion resistance is overcoated. Has been adopted. However, the former method has a problem in that poor adhesion and voids are likely to occur because of poor affinity with a varnish or resin that is impregnated or injected after winding an enamel wire around a motor or a transformer. In the latter method, it is not possible to bake under the same conditions (furnace temperature, baking speed, etc.) as the baking wire for the undercoat enamel wire, which lowers productivity and also decreases enameled wire characteristics such as cut-through temperature. However, since the price was higher, the range of use was limited.

Recently, a method of dispersing wax or low molecular weight polyethylene in a synthetic resin coating for undercoat of enamel wire and overcoating this under the same conditions as the coating for undercoat has been studied. Since molecular weight polyethylene has poor compatibility with synthetic resins for enameled wires and solvents, it is difficult to disperse it in synthetic resin paints for enameled wires.For example, it may be separated even if it is forcibly dispersed by a method such as strong stirring. However, since the dispersibility is poor, the appearance of the enameled wire is poor and the slidability is poor, and the slidability is deteriorated in a high baking temperature range of the enameled wire.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, has good dispersibility of a lubricant, and is excellent in the appearance and slidability of the resulting enameled wire, and a resin composition for electrical insulation. To provide an enamel wire using.

[0006]

Means for Solving the Problems The inventors of the present invention have made extensive studies in view of the above-mentioned problems, and as a result, the dispersibility of the lubricant has been improved by mixing the tetrafluoroethylene resin with the following ammonium salt, and the enamel wire It was found that the appearance and the slipperiness thereof were good, and the present invention was reached. That is, the present invention relates to 0.1 to 10 parts by weight of (A) tetrafluoroethylene resin and (B) general formula to 100 parts by weight of the resin content of the synthetic resin coating for electrical insulation.

[Chemical 2] (N is an integer of 1 to 20) 0.1 to 10 parts by weight of an ammonium salt represented by the formula, and a resin composition for electrical insulation, and the composition directly on the conductor or through another insulator. Enamel wire coated and baked.

The synthetic resin paint for electrical insulation used in the present invention is not particularly limited. For example, polyvinyl formal,
A paint containing a resin such as polyurethane, polyester, polyester imide, polyamide imide, or polyimide is used.

The molecular weight of the tetrafluoroethylene resin (A) used in the present invention is not particularly limited, but it is in the form of fine powder or dispersion. The particle size is preferably 5 μm or less, more preferably 3 μm or less, in view of the appearance and slidability of the enameled wire. Examples of commercially available products include Lubron LD-1, manufactured by Daikin Industries, Ltd.,
Lubron LD-100, Lubron LA, Lubron L-
5, Lubron L-2, Fluon L-1 manufactured by Asahi Glass Co., Ltd.
70, FLUON L-171, BYDAX AR manufactured by DuPont, and the like. Ethylene tetrafluoride is distributed on the surface of the enameled wire and is used to impart good slidability to the enameled wire. The amount of the tetrafluoroethylene resin (A) used is 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the resin content of the paint. If the amount used is less than 0.1 parts by weight, the effect of slipperiness will be poor, and if it exceeds 10 parts by weight, the appearance of the enamel wire will be poor.

Ammonium salt (B) used in the present invention
Is the general formula

[Chemical 3] (N is an integer of 1 to 20). As a commercially available product, Florard FC-143 manufactured by 3M Company can be mentioned.
The ammonium salt is used to enhance the dispersibility of the tetrafluoroethylene resin in the paint and to obtain a good appearance and slipperiness of the enameled wire. The amount of ammonium salt (B) used is
The amount is 0.1 to 10 parts by weight, preferably 0.2 to 4 parts by weight, based on 100 parts by weight of the resin content of the paint. Usage is 0.
If it is less than 1 part by weight, the dispersibility of the lubricant is poor, and the appearance and slidability of the enamel wire are poor. If it exceeds 10 parts by weight, the appearance of the enameled wire and other properties of the enameled wire are deteriorated.

The method of adding the above (A) and (B) to the synthetic resin coating for electrical insulation is not particularly limited, but the above (A) can be obtained by a dispersing machine such as an impeller type high speed disperser, a triple roll or a bead mill. ) And (B) are preferably dispersed in the paint.

The electrical insulating resin composition of the present invention can be applied directly onto a conductor or through another insulating material and baked to obtain an enamel wire.

[0012]

EXAMPLES The present invention will now be described in more detail with reference to examples. In addition, the part in an example means a weight part. Example 1 500 parts of polyester varnish WH-4060 (manufactured by Hitachi Chemical Co., Ltd., resin content: 43% by weight) was added to Lubron LD-1.
45 parts of 00 (5% by weight tetrafluoroethylene resin dispersion, manufactured by Daikin Industries, Ltd.) and 2 parts of Florard FC-143 (ammonium salt, manufactured by 3M Co., Ltd.) were added, and after stirring, kneaded with a three-roll mill to give a lubricant. A dispersed resin composition for electrical insulation was obtained.

Example 2 A resin composition for electrical insulation was obtained in the same manner as in Example 1 except that 2 parts of Lubron LD-5 (tetrafluoroethylene resin powder, manufactured by Daikin Industries, Ltd.) was used in Example 1. It was

Comparative Example 1 A resin composition for electrical insulation was obtained in the same manner as in Example 1 except that Florard FC-143 was not added.

Comparative Example 2 An electric insulating resin composition was obtained in the same manner as in Example 2 except that Florard FC-143 was not added.

Test Example The electrical insulating resin compositions obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were applied to a copper wire having a diameter of 1.0 mm and baked according to the baking conditions shown below to make an enamel wire. Was manufactured. Substrate: WH-4060 (polyester varnish, manufactured by Hitachi Chemical Co., Ltd.); 5 times of dies Upper: resin composition for electrical insulation obtained in each Example or Comparative Example; 2 times of dies Baking furnace: Vertical hot air oven (furnace 5 m long) Furnace temperature: inlet / outlet = 320 ° C./430° C. Linear velocity: 14 m / min The characteristics of each enamel wire coating were tested by the following methods, and the results are shown in Table 1. (1) Appearance of enamel wire: The film of the enamel wire was visually observed to determine whether or not there were abnormalities such as foaming and rough skin, and those without these were regarded as good. (2) Flexibility: Inspected according to JIS C3003.8.1 (1). (3) Pinhole: Inspected according to JIS C3003.36. (4) Dielectric breakdown voltage: JIS C3003.11.
It investigated according to (2). (5) Reciprocating wear: It was examined according to the old JIS C3003.10.1. (6) Coefficient of static friction: The coefficient of static friction between enameled wires is measured, and the measurement method uses an electric wire slip tester manufactured by Toyo Seiki Co., Ltd., and four enameled wires are placed on the same surface on a tilted table. Stretch out in a divergent manner, and place a sled on which two enameled wires that are the same as the sample enameled wire are stretched in parallel so as to intersect with these four enameled wires, and gradually incline this from the horizontal position. Then, the sled start angle of the sled was read on the tangent scale. The sled load is 100
set to g.

[0017]

[Table 1] From Table 1, it is shown that the enamel wire obtained using the resin composition for electrical insulation of the present invention has excellent slipperiness and wear resistance.

[0018]

EFFECT OF THE INVENTION According to the resin composition for electrical insulation of the present invention, the tetrafluoroethylene resin as a lubricant can be favorably dispersed in a coating material by adding a specific ammonium salt, so that the appearance, slipperiness, and An enamel wire with good wear resistance can be obtained, which is useful for severe winding, processing, and assembly work in recent years.

Claims (2)

[Claims] 1. A resin component 100 of a synthetic resin paint for electrical insulation.
0.1 to 1 parts by weight of (A) tetrafluoroethylene resin to parts by weight
0 parts by weight and (B) general formula A resin composition for electrical insulation, comprising 0.1 to 10 parts by weight of an ammonium salt represented by (n is an integer of 1 to 20). 2. An insulated wire obtained by applying and baking the resin composition for electrical insulation according to claim 1 on a conductor directly or via another insulator.