JP3008616B2 - Resin composition for electrical insulation and enameled wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for electrical insulation and an enameled wire.

[0002]

2. Description of the Related Art Conventionally, insulated wires (hereinafter abbreviated as enameled wires) obtained by applying and baking a synthetic resin paint such as polyvinyl formal, polyurethane, polyester, polyester imide, polyamide imide, etc. on a conductor are referred to as respective enamel wires. It is used for various applications such as motors and transformers depending on its characteristics. In recent years, electric manufacturers that use enameled wires have introduced automatic high-speed winding machines to streamline the manufacturing process of their equipment. Layers are mechanically damaged, causing layer shorts, poor grounding, and the like, resulting in an increase in the product failure rate. Therefore, there is a demand for an enameled wire with less mechanical damage and excellent lubricity.

[0003] Normally, since enameled wire alone has poor lubricity, liquid paraffin, solid paraffin, insulating oil, wax or the like is applied onto the enameled wire, or nylon or the like having excellent mechanical strength and abrasion resistance is overcoated. The method is adopted. However, in the former method, when the enameled wire is wound on a motor or a transformer, and then treated with an impregnated varnish or a casting resin, the paraffin or the like has a poor affinity for the impregnated varnish or the casting resin. And voids are easily generated. In the latter case,
There is a problem that productivity cannot be reduced because baking cannot be carried out under the same conditions (furnace temperature, baking speed, etc.) as the baking wire of the undercoat enameled wire, and enameled wire characteristics such as cut-through temperature are reduced. Furthermore, the range of use was limited due to the high price. Recently, a method of overcoating a coating material in which wax or low-molecular-weight polyethylene is dispersed in a synthetic resin coating material for enamel wire under the same conditions as an undercoating paint has been studied, but waxes and low-molecular-weight polyethylene are not suitable for enamel wire. Poor compatibility with synthetic resins and solvents, difficult to disperse in synthetic resin paint for enameled wires, waxes and low molecular weight polyethylene can be separated in a short time even if it is forcibly dispersed by a method such as strong stirring Had the disadvantage of doing so.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned disadvantages of the above-mentioned technology, and can form a self-lubricating film having excellent dispersibility of a lubricant and excellent storage stability of a paint at a high temperature. An object of the present invention is to provide a resin composition for electrical insulation and an enameled wire using the same.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above-mentioned problems, and as a result, further added an organic bentonite to an electrically insulating resin composition containing a partially saponified ester wax and low molecular weight polyethylene. By doing
The inventors have found that the dispersibility of the lubricant and the stability of the paint at high temperatures can be significantly improved, and have reached the present invention. That is, the present invention relates to a method for producing a resin component 100
(A) Partially saponified ester wax per part by weight
1 to 10 parts by weight, (B) 0.1 to 10 parts by weight of low molecular weight polyethylene having a number average molecular weight of 5,000 or less, and (C) 0.05 to 10 parts by weight of organic bentonite, and a resin composition for electrical insulation; The present invention relates to an enameled wire which is applied and baked on a conductor directly or via another insulating material.

The resin content of the synthetic resin coating for electrical insulation used in the present invention is not particularly limited. For example, a coating containing a resin such as polyvinyl formal, polyurethane, polyester, polyester imide, polyamide imide or polyimide is used. Of these, polyester resin paints are particularly preferred in view of the appearance of the enameled wire. The partially saponified ester wax (A) used in the present invention includes:
For example

[0007]

Embedded image Wherein R and R ′ each represent a hydrocarbon group having 28 to 32 carbon atoms, and derivatives thereof. Commercially available products include, for example, Hoechstwax O
P, Hoechst wax X55, Hoechst wax O, Hoechst wax OM, Hoechst wax FL (all are trade names made by Hoechst Japan Co., Ltd.) and the like. The partially saponified ester wax is used because of its excellent compatibility with the low molecular weight polyethylene (B). The amount of the partially saponified ester wax (A) used is as follows:
The amount is 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight based on 00 parts by weight. If the amount is less than 0.1 part by weight, the effect of the slipperiness is inferior, and if it exceeds 10 parts by weight, the appearance of the enameled wire is inferior.

The low molecular weight polyethylene (B) used in the present invention is not particularly limited as long as it has a number average molecular weight of 5,000 or less, preferably 1,000 to 4,000. When the number average molecular weight exceeds 5000, dispersibility is poor,
The appearance of the enameled wire is reduced. Examples of this commercially available product include Hoechst Wax PE520 (trade name, manufactured by Hoechst Japan Co., Ltd.). The amount of the low molecular weight polyethylene used is 0.1 to 1 with respect to 100 parts by weight of the resin component of the paint.
0 parts by weight, preferably 0.2 to 5 parts by weight. If the amount used is less than 0.1 part by weight, there is no slipping effect, and if it exceeds 10 parts by weight, the appearance of the enameled wire deteriorates. Component (A)
Alternatively, when the component (B) is blended alone, the dispersion in the coating composition becomes uneven, the appearance of the enameled wire is reduced, and the composition undergoes layer separation in a short time.

Examples of the organic bentonite (C) used in the present invention include those obtained by treating a fine clay mainly composed of montmorillonite with an aliphatic amine salt, a quaternary ammonium salt or the like to impart lipophilicity. Can be The particle size is preferably 1 μm or less from the viewpoint of the appearance of the enameled wire. Benton 27, Benton 3
4, Benton SD-1 and Benton SD-2 (all are trade names manufactured by Leox). The amount of the organic bentonite used is 0.05 to 10 with respect to the resin content of the paint.
Parts by weight, preferably 0.1 to 5 parts by weight. If the amount used is less than 0.05 part by weight, the stability of the paint at high temperatures is insufficient, and if it exceeds 10 parts by weight, the viscosity of the paint itself becomes too high, and the thixotropic property becomes large, resulting in reduced workability. , The appearance of the enameled wire is reduced.

The method of adding the above components (A) to (C) to the synthetic resin paint for enameled wire is not particularly limited. For example, partially saponified ester wax (A), low molecular weight polyethylene (B) and organic Bentonite (C)
Is dispersed in an organic solvent to prepare a dispersion, and this dispersion is added to a synthetic resin coating for enameled wire, and sufficiently kneaded with a dispersion machine such as a ball mill, a three-roll mill, or a homomixer. An enameled wire can be obtained by directly applying and baking the resin composition for electrical insulation of the present invention onto a conductor or by applying and baking over another insulating material to overcoat. The resin composition for electrical insulation of the present invention, because the lubricant is well dispersed, excellent in slipperiness, abrasion resistance and appearance,
Also, the dispersion stability of the lubricant at high temperatures is excellent.

[0011]

The present invention will be described below in more detail with reference to examples. In addition, the part in an example means a weight part. Example 1 Hoechst wax OP (partially saponified ester wax, trade name of Hoechst Japan Co., Ltd.) and Hoechst wax PE520 (low molecular weight polyethylene,
Number average molecular weight 2000, trade name of Hoechst Japan)
8 parts each and heat-dissolve it. At room temperature, the mixture is rapidly added to a liquid obtained by dispersing 4 parts of Benton 34 (organic bentonite, trade name, manufactured by Rheox Co.) in 112 parts of xylene, while rapidly stirring to uniformly disperse the wax. did. 10 parts of this uniform dispersion was added to 200 parts of polyester varnish WH-4060 (manufactured by Hitachi Chemical Co., Ltd., resin content 40% by weight),
It was dispersed by a ball mill to obtain a resin composition.

Example 2 In Example 1, Hoechstwax PE130 (low molecular weight polyethylene, number average molecular weight 3000, trade name, manufactured by Hoechst Japan Co.) was used instead of Hoechstwax PE520, and Benton 27 (organic bentonite, A resin composition was obtained in the same manner as in Example 1 except that Phenox (trade name) was used. Example 3 In Example 1, Benton S was used instead of Benton 34.
A resin composition was obtained in the same manner as in Example 1, except that D-1 (organic bentone, trade name, manufactured by Phenox Corporation) was used.

Comparative Example 1 A resin composition was obtained in the same manner as in Example 1 except that Benton 34 was not added. Comparative Example 2 A resin composition was obtained in the same manner as in Example 2 except that Benton 27 was not added. Comparative Example 3 A resin composition was obtained in the same manner as in Example 3, except that Benton SD-1 was not added.

<Test Examples> Examples 1 to 3 and Comparative Examples 1 to
The resin composition obtained in 3 was coated and baked on a copper wire having a diameter of 0.4 mm according to the baking conditions shown below to produce an enameled wire. Coating method: Base (WH-4060): 5 dies Upper ground (resin composition obtained in each example or comparative example): 2 dies Baking conditions: Baking furnace: Horizontal furnace electric heating furnace (furnace length 3 m) Furnace temperature : Inlet / outlet = 450 ° C / 500 ° C Linear velocity: 30 m / min

Each of the obtained enameled wire films was smooth in appearance and no abnormality was observed. The properties of each enameled wire film were tested by the following methods, and the results are shown in Table 1. (1) Flexibility: Inspection was performed according to JIS C3003, 8, 1 (1). (2) Pinhole: Investigated according to JIS C3003,36. (3) Dielectric breakdown voltage: JIS C3003, 11 (2)
It investigated according to. (4) Reciprocating wear: Investigated according to old JIS C3003, 10 and 1. (5) Static friction coefficient: The static friction coefficient between enamel wires is measured. The measuring method is to use a wire slip tester manufactured by Toyo Seiki Co., Ltd., and place four wires on the same surface on an inclined table. Spread it in a divergent shape, and put a sled on which two other wires are wound in parallel so as to intersect with the four wires, and gradually incline it from the horizontal position, and set the sled's sliding start angle. Read on tangent scale. The load of the sled was set to 100 g. (6) Dispersion stability: 40 g of the resin composition was placed in a 50 cc glass bottle, left in a 60 ° C. constant temperature bath for 1 week, and the separated state of the contents was observed.

[0016]

[Table 1] As is clear from Table 1, the resin composition of the present invention exhibits excellent dispersion stability at high temperatures, and the enameled wire obtained therefrom exhibits excellent slip properties and abrasion resistance.

[0017]

According to the resin composition for electrical insulation of the present invention, it is possible to obtain an enameled wire having excellent slipperiness and abrasion resistance and good appearance. In addition, the resin composition for electrical insulation of the present invention has excellent dispersion stability at high temperatures, can be stored for a long period of time, and has excellent handling and workability, and is useful for recent severe winding, processing, and assembly work. It is.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yasunori Okada 4-3-1-1, Higashicho, Hitachi City, Ibaraki Prefecture, Hitachi Chemical Co., Ltd. Yamazaki Plant (56) References JP-A-4-2066311 (JP, A) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) H01B 3/30 C09D 5/25 H01B 7/02 H01B 7/18

Claims (2)

(57) [Claims] 1. The resin content of a synthetic resin paint for electrical insulation is 100.
(A) 0.1 to 10 parts by weight of partially saponified ester wax, (B) 0.1 to 10 parts by weight of low molecular weight polyethylene having a number average molecular weight of 5,000 or less, and (C) 0.05 of organic bentonite based on parts by weight. A resin composition for electrical insulation, comprising 10 to 10 parts by weight. 2. An enameled wire obtained by applying and baking the resin composition for electrical insulation according to claim 1 onto a conductor directly or via another insulating material.