JPH0945142A - Insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve lubricity by forming an insulating film with the first paint containing an insulating material on a conductor, and forming a film at the prescribed thickness with the second paint combined with a lubricant into a polyester or polyester imide. SOLUTION: A conductor is coated and baked with a polyimide or polyamide imide insulating paint to form an insulating film, for example, then it is coated and baked with the second paint combined with a lubricant into a polyester or polyester imide paint. The thickness of the film by the second paint is set to 0.005mm or below. The lubricant 0.5-10pts.wt. is preferably combined into the solid polyester paint 100 pts.wt. Natural wax, synthetic wax, or silicone may be used for the polyester solid paint, and polyethylene wax is preferably used in particular. Since the lubricant in the second paint is bled on the surface at the time of baking, the surface lubricity is considered to be improved while no lubricant is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated wire having excellent lubricity and work resistance.

[0002]

2. Description of the Related Art In recent years, as devices have become smaller and more sophisticated,
The coil itself is also required to be smaller and more efficient, and many insulated wires are packed in a limited space. Therefore, the insulated wire has a problem that the film is easily damaged by a needle or the like of the automatic winding machine, and a rare short circuit and a ground defect are easily generated. As a measure for solving this problem, an attempt has been made to reduce the coefficient of friction on the surface of the insulated wire so as to make it less susceptible to film damage. As one of the methods, a method of applying a lubricant such as wax on an insulated wire has been used in the past.

[0003]

However, in the above method, it was difficult to control the amount of the lubricant applied, and it was difficult to apply the lubricant uniformly on the surface of the insulated wire. Further, since dust and foreign matters easily adhere to the lubricant applied on the insulated wires, a step of washing with a solvent is required.

[0004] As another method, a method of imparting lubricity to an insulated wire has been studied. This method is a method in which various lubricants such as polyethylene, polytetrafluoroethylene, molybdenum disulfide, boron nitride, waxes and the like are added to an insulating paint in advance and mixed. However, in the case of this method, since the lubricant is insoluble or hardly soluble in the insulating paint, it is extremely difficult to uniformly disperse the lubricant in the insulating paint. The problem has arisen.

[0005] The problems of disconnection and poor appearance have been solved by examining the type and amount of lubricant added, but in this case, the lubricating properties of the insulated wire obtained were insufficient.
In particular, polyamideimide, which is a heat-resistant insulating paint, a lubricant is added to a polyimide or the like, and the above problem is large when lubricity is to be improved.
A heat-resistant insulated wire having a coating made of polyimide or the like has not been obtained.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an insulated wire having good lubricity without having to apply a lubricant such as wax to the insulated wire. ADVANTAGE OF THE INVENTION According to this invention, the lubricity of polyamideimide, polyimide, etc. used especially for heat resistant insulated wires can be greatly improved.

According to the present invention, a first coating material containing an insulating material is applied and baked on a conductor to form an insulating film, and then a second coating material in which a polyester or polyesterimide coating material is mixed with a lubricant is formed to a film thickness of 0. (EN) Provided is an insulated electric wire characterized by being coated and baked to a thickness of 0.005 mm or less.

The present invention will be described in detail below. As the insulating material used in the first paint, any material can be used as long as it can be generally used. For example, polyimide, polyamide imide, polyester imide, polyester amide imide, polyhydantoin, polyester, polyurethane, polyvinyl formal Etc. Among them, insulated wires using polyimide or polyamide-imide as an insulating coating material are not particularly effective because they do not have good lubricity as in the present invention.

The polyimide or polyamide-imide paint is a heat-resistant paint having an imide bond in a molecule. For example, a polyimide paint such as Pile M manufactured by DuPont
L, Toray Industries # 2000, # 3000, etc., and as a polyamideimide paint, Hitachi Chemical Co., Ltd. H
I-400, HI-405, HI-406 and the like.

The polyester or polyester imide paint containing a lubricant is a paint mainly having an ester bond or an ester bond and an imide bond in the molecule. For example, a polyester paint mainly having an ester bond is Nitto Denko. Delacoat E-270, Delacoat E-220, Ryton 3600, Ryton 2100, Tosoku Paint Co., Ltd.
0, such as Bridinol E1000 manufactured by Dainichi Seika Co., Ltd., and as a polyester-imide coating mainly having an ester bond and an imide bond, Isomid 4 manufactured by Nippon Schenectady
0, Isomid RL, Dainichiseika FS-304, F
There is S-201 etc.

The solvent used in the first paint and the second paint is an organic solvent. For example: Basic solvents such as DMF, DMAc and NM ₂ P, phenols such as cresol, phenol and xylenol, aromatic hydrocarbons such as toluene, xylene and alkylbenzene, ethers such as dioxane and THF, ketones such as MEK and cyclohexanone , Esters such as ethyl acetate and butyl acetate, glycols such as cellosolve and glycosolve, or esters thereof.

The lubricant is a wax, silicone or the like which can improve the lubricity, and examples thereof include the following. Natural waxes include candelilla wax, carnauba wax, rice wax, vegetable wax such as wax, wax such as beeswax, lanolin, animal wax such as whale wax, montan wax, ozokerite, mineral wax such as ceresin, paraffin wax, As petroleum wax such as microcrystalline wax, synthetic wax,
Synthetic hydrocarbons such as Fischer-Tropsch wax and polyethylene wax, modified waxes such as montan wax derivatives, paraffin wax derivatives and microcrystalline wax derivatives, hydrogenated waxes such as hardened castor oil and hardened castor oil derivatives, 12-hydroxystearic acid, stearic acid Examples include amide and phthalic anhydride.

As the silicone, methyl silicone,
Oils and derivatives such as phenyl silicone can be used.
Of course, a mixture of the above wax and silicone can also be used. The blending amount of the lubricant is preferably 0.5 to 10 parts by weight based on 100 parts by weight of the solid content of the polyester or polyesterimide coating. If it is 0.5 parts by weight or less, the effect is small, and if it is 10 parts by weight or more, the appearance of the film is poor and the strength is also lowered.

Among the above, when a synthetic hydrocarbon wax such as polyethylene is used, the lubricity is good, and the cleaning solvent,
It is more preferable because it is difficult to be extracted by a refrigerant or the like. The second paint, which is a polyester or polyesterimide paint mixed with a lubricant, must be applied and baked to a film thickness of 0.005 mm or less. When the thickness of the film exceeds 0.005 mm,
The effect of improving lubricity cannot be obtained. The lower limit of the thickness of the coating formed from the second paint differs depending on the combination of materials,
For example, it is 0.0005 mm.

The conductor is copper, Ni-plated copper, aluminum, gold,
Any material such as gold-plated copper may be used. After applying the first paint to the conductor, baking is performed at 400 to 600 ° C. The thickness of the film formed by the first coating material usually differs depending on the dimensions of the conductor, but is, for example, 0.020 to 0.050 mm when the conductor diameter is 1.0 mm. Then the second
After applying the paint, baking is performed at 400 to 600 ° C.

The reason why the lubricity is improved in the present invention is estimated as follows. It is believed that the addition of a lubricant to the insulating coating improves the surface lubricity of the coating because the lubricant in the coating bleeds to the surface when the insulating coating is baked. It is considered that the presence of a large amount of lubricant on the surface of the wire coating improves the lubricity of the wire. Therefore, it is presumed that the amount of lubricant bleeding to the surface differs depending on the compatibility between the resin or solvent which is a component of the insulating paint and the lubricant, and the softness of the film during baking, which causes a difference in lubricity. When the polyester or polyesterimide coating of the present invention is used, the compatibility with the lubricant is appropriate, and the film is soft during baking (the molecular motion of the material is intense).
Therefore, it is considered that the lubricity is improved.

[0017]

EXAMPLES Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to only the following Examples.

Example 1 A copper coating having a diameter of 1.0 mm was coated with a first paint composed of amide imide varnish (HI-400 manufactured by Hitachi Chemical Co., Ltd.) to a film thickness of 0.030 mm.
Polyethylene wax (220P manufactured by Mitsui Petrochemical Co., Ltd.) was further applied to polyester paint (Delacoat E-200 manufactured by Nitto Denko Corporation) after coating and baking (baking temperature 450 ° C.) on a polyester coating (3 parts by weight) The second coating material added in part was applied and baked to a film thickness of 0.002 mm (baking temperature 450 ° C.). The characteristics of the obtained electric wire are shown in Table 1.

The lubricity is obtained by placing two electric wires on a horizontal base and placing two electric wires on the bottom of the electric wires so that the electric wire of the base and the electric wire of the load come into vertical contact with each other. The force when the load was moved at a moving speed of 10 cm / min was measured, and the equation: Dynamic friction coefficient = F / W [where F is the force (kgW) required to pull the load in the horizontal direction, and W is It is the mass of the load (kg). ] To calculate the dynamic friction coefficient and evaluate the lubricity.

Example 2 An electric wire was produced in the same manner as in Example except that polyimide varnish (ML manufactured by DuPont) was applied and baked instead of the amide imide varnish. The characteristics of the obtained electric wire are shown in Table 1.

Example 3 Esterimide Varnish Instead of Amidoimide Varnish
(Nippon Schenectady's Isomid 40) (Film thickness:
0.022 mm) and amido imide varnish (film thickness: 0.0
An electric wire was prepared in the same manner as in Example 1 except that (08 mm) was sequentially applied and baked. The characteristics of the obtained electric wire are shown in Table 1.

Examples 4 to 6 Esterimide coating (ISOMID 40 manufactured by Nichitan Schenectady) (Example 4), esterimide coating (FS-manufactured by Dainichiseika Co., Ltd.) were used instead of the polyester coating. No. 201) (Example 5) and polyester coating (Isonel 200) (Example 6) were used to prepare an electric wire in the same manner as in Example 1. The characteristics of the obtained electric wire are shown in Table 1.

Comparative Examples 1 and 2 Instead of the polyester paint, the paint containing polyethylene wax was replaced by a polyimide paint (ML manufactured by DuPont) (Comparative Example 1) and an amide imide paint (HI-40 manufactured by Hitachi Chemical Co., Ltd.).
An electric wire was produced in the same manner as in Example 1 except that (0) (Comparative Example 2) was used. The characteristics of the obtained electric wire are shown in Table 1.

Examples 7 to 11 Carnauba wax instead of polyethylene wax
(Example 7), except that beeswax (Example 8), solid paraffin (Example 9), montan wax (Example 10), and microcrystalline wax (Example 11) were used. An electric wire was produced. Table 2 shows the measurement results of the lubricity of the obtained electric wires.

Examples 12 to 16 and Comparative Example 3 and
The amount of polyethylene wax blended in 4 polyester paint was 0.3 parts by weight (Comparative Example 3), 0.5 parts by weight (Example 12),
1.0 parts by weight (Example 13), 2.0 parts by weight (Example 14),
5 parts by weight (Example 15), 10 parts by weight (Example 16), 15 parts by weight
An electric wire was produced in the same manner as in Example 1 except that the parts by weight (Comparative Example 4) were used. Table 2 shows the measurement results of the lubricity of the obtained electric wires.
Shown in

[0026]

[Table 1]

[0027]

[Table 2]

Front page continuation (72) Inventor Hiroki Taguchi 1-7-10 Kikuzumi, Minami-ku, Aichi Prefecture Nagoya, Sumitomo Electric Industries, Ltd. (72) Inventor Toshiaki Shishino 1-chome, Kikuzumi, Minami-ku, Aichi Prefecture No. 10 Sumitomo Electric Industries, Ltd. Nagoya Works

Claims (4)

[Claims] 1. A first coating material containing an insulating material is applied and baked on a conductor to form an insulating film, and then a second coating material obtained by mixing a polyester or polyesterimide coating material with a lubricant is formed to a film thickness of 0.005 mm. An insulated wire characterized by being applied and baked below. 2. A lubricant is added in an amount of 0.5 to 1 with respect to 100 parts by weight of the solid content of the polyester or polyesterimide coating.
The insulated electric wire according to claim 1, wherein 0 part by weight is blended. 3. The insulated wire according to claim 1, wherein the lubricant is polyethylene wax. 4. The insulated wire according to claim 1, wherein among the insulating paints which are applied / baked on a conductor to form an insulating film, the insulating paint applied / baked on the outermost layer is a polyimide or polyamide-imide paint.