JPH08185721A - Lubricated insulated electric wire - Google Patents

Abstract

PURPOSE: To provide a lubricated insulated electric wire having improved lubricity. CONSTITUTION: A paint compounded with a condensation polymer of ethylene diamine and fatty acid having the molecular weight of 500 or above at 0.05-25 pts.wt. to a resin of 100 pts.wt. is applied and baked on the outermost layer. Excellent lubricity and excellent heat resistance is obtained, the lubricity is not impaired when this electric wire is heated at baking. The mechanical damage is hardly inflicted on the electric wire even when it is used under severe conditions, and troubles such as a layer short and the faulty earthing rarely occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated electric wire used in a wide range of applications such as an electric wire for a coil of equipment such as electric and communication equipment, and particularly, it has excellent lubricity in its outermost coating layer. It was given.

[0002]

2. Description of the Related Art Insulated wires are sometimes damaged by nozzles, pulleys, etc. in the winding process during the manufacture of equipment coils and the like, which may cause layer shorts and grounding defects. In recent years, high-speed automatic winding machines have become widespread, and it has become possible to wind insulated wires at high speeds. However, the insulated wires are now handled under severe conditions and are easily damaged by mechanical damage. became. Therefore, in order to prevent damage to the insulated wire and more reliably perform high-speed winding treatment, a treatment such as applying lubricating oil has been performed in order to reduce the friction coefficient of the surface of the insulated wire. However, if the lubricant is simply applied, it is not possible to follow the speeding up of the winding. Therefore, a lubricating layer made of a resin such as polyamide or polyethylene having a small friction coefficient has been provided as the outermost layer of the insulated wire. Further, in order to exert more lubricity, various lubricants such as fine particles of fluororesin have been blended.

[0003]

However, although the insulated wires provided with these conventional lubricating layers have excellent lubricity as compared with the insulated wires before that, they do not always exhibit sufficient lubricity. Insulated electric wires having better lubricity are desired. Further, the lubricating layer is formed by applying the coating material and baking it, and the fact that the lubricant is decomposed by the heat at that time also contributes to the improvement of the lubricity.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lubricated insulated electric wire which withstands the temperature during baking and has improved lubricity.

[0005]

The lubricated insulated wire according to the present invention is a polycondensation product of ethylenediamine and a fatty acid having a molecular weight of 500 or more with respect to 100 parts by weight of a resin content of 0.05 to 25. It is characterized in that a coating material mixed in parts by weight is applied to the outermost layer and baked.

The lubricated insulated wire according to the invention of claim 2 is
It is characterized in that a paint having a molecular weight of 500 or more and a polycondensation product of ethylenediamine and a fatty acid dissolved in a solvent is applied to the outermost layer and baked.

The details will be described below. The lubricated insulated wire according to the present invention is formed by coating and baking a lubricant coating on the outermost layer thereof, and the lubricant coating is formed by mixing a resin as a main component with a lubricant. . As the resin that is the main component of the coating material, polyamide imide, polyester, polyester imide, polyester amide imide, polyvinyl formal, polyhydantoin, and a mixture of two or more of the above resins can be used. Polyamideimide is preferable in terms of further improving lubricity,
When considering the lubricated insulated wire of the present invention in the field of refrigerator motors and the like, among these various insulators,
Polyester, polyester imide, and polyester amide imide used as an insulator of the insulated wire for refrigerant resistance are preferable, and polyester and polyester imide are more preferable.

Polyamideimide is synthesized from various raw materials and is obtained, for example, from tribasic acid anhydride monohalide and polyamine (for example, USP326069).
1 and USP 3347828), those obtained from a tetrabasic acid dihydrate having an amide group and a polyamine (for example, USP
3355427, USP3453292, etc.), obtained from tribasic acid anhydride and polyisocyanate (for example,
USP3300420, USP3314923, USP
3541033 etc.) and the like, tribasic acid anhydrides, cyclic lactams, those obtained with polyisocyanates, tribasic acid anhydrides, aminocarboxylic acids, those obtained with polyisocyanates, tribasic acid anhydride monohydrides, polyamines , Those obtained with polyisocyanate, those obtained with dibasic acid halides, tetrabasic acid anhydrides, polyamines,
Examples thereof include those obtained from tribasic acid anhydrides and polyisocyanates and alkylene carbonates, and those obtained from tribasic acid anhydrides and polyisocyanates and polyols. It is also possible to change the combination of these raw materials, or replace a part or all of the tribasic acid anhydride with another polybasic acid or its derivative.

Any combination of the above-mentioned raw materials can be adopted as the raw material forming the polyamide-imide. Examples of polybasic acids are aromatic, aliphatic,
There are alicyclic polycarboxylic acids and their derivatives, such as trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic dianhydride, benzophenonetetracarboxylic dianhydride, 1,2,3,4 -Butanetetracarboxylic acid, isophthalic acid, terephthalic acid, adipic acid, sebacic acid, etc.
Diamine dicarboxylic acid dianhydride obtained from 1 mol of diamine, diimide dicarboxylic acid obtained from 2 mol of tribasic acid and 1 mol of diamine, obtained from 1 mol of tribasic acid anhydride and 1 mol of amino acid Examples thereof include diimide dicarboxylic acid, 2 mol of an unsaturated dibasic acid capable of forming a 5- or 6-membered ring, and 1 mol of a dilactam dicarboxylic acid obtained from diamine. In addition to these various polybasic acids and their anhydrides, trimellitic acid monochloride,
Acid halides such as isophthalic acid dichloride and terephthalic acid dichloride, and esters such as trimellitic acid monomethyl ester, dimethyl terephthalate, and dimethyl isophthalate can also be used.

Examples of amino acids include glycine, β-alanine, ε-aminocaproic acid, p-aminobenzoic acid and the like. Examples of unsaturated dibasic acids capable of reacting with a diamine to form a 5- or 6-membered ring include itaconic acid,
Examples include aconitic acid. Examples of polyamines include aromatic, aliphatic, and alicyclic polyamines, such as 4,4-diaminodiphenylmethane, 4,4-diaminodiphenyl ether, m-phenylenediamine, p-
Examples thereof include phenylenediamine, ethylenediamine, hexamethylenediamine, m-xylenediamine and p-xylenediamine.

Examples of the polyisocyanate include aromatic, aliphatic and alicyclic polyisocyanates such as diphenylmethane-4,4'-diisocyanate and diphenylether-4,4'-diisocyanate, 2,4.
-Tolylene diisocyanate, 2,6-tolylene diisocyanate, m-xylene diisocyanate, p-xylene diisocyanate, isophorone diisocyanate,
Ethylene diisocyanate, hexamethylene diisocyanate, trimer of tolylene diisocyanate, trimer of isophorone isocyanate, polyphenyl-polymethylene-polyisocyanate, etc., and the isocyanate groups of these various polyisocyanates are phenolic hydroxyl groups and alcoholic hydroxyl groups. And a so-called stabilized polyisocyanate stabilized by a cyclic lactam. These are used alone or as a mixture. Examples of cyclic lactams include ε-caprolactam, δ-valerolactam, ω-laurolactam and the like. Examples of alkylene carbonate include ethylene carbonate, propylene carbonate and the like. As a combination,
Among them, a combination of tribasic acid anhydride and polyisocyanate is preferable.

Further, as a main component of the lubricating coating, so-called
Waxes can also be used. Examples of the waxes include natural waxes such as carnauba wax, candelilla wax, montan wax, oliculie wax, cane wax, beeswax, whale wax, Chinese insect wax, wood wax, ozokerite, and ceresin. Synthetic waxes include microcrystalline wax, paraffin wax, low molecular weight polyethylene, and their derivatives, montan derivatives, microwax derivatives, synthetic oxide wax, polyethylene glycol, sorbitol stearate, castol wax, opal wax,
Examples include atactic polypropylene, alpha olefin wax, and halogenated hydrocarbons. These waxes can be used alone or in combination of two or more at an arbitrary ratio.

A polycondensation product of ethylenediamine and a fatty acid is used as a lubricant compounded in the lubricating coating composition of the present invention. The fatty acid, fatty acid carbon atoms containing 10 or more methylene groups, _{i.e., CH 3 - (CH 2)} n -COO
In H 2, stearic acid is a fatty acid in which n is 10 or more,
Sebacic acid and the like are particularly preferable.

The molecular weight of this lubricant is preferably 500 or more, more preferably 700 or more. Molecular weight is 500
If it is less than the above range, the melting point is lowered and the heat resistance is lowered. The melting point of the lubricant is preferably 200 ° C. or higher.

The blending amount of the lubricant with respect to the lubricating paint is 0.05 to 100 parts by weight of the resin content of the lubricating paint.
It is preferably in the range of 25 parts by weight, and 0.1 to 20
More preferably, it is part by weight. Lubricant content is 0.0
When the amount is less than 5 parts by weight, the coefficient of static friction of the obtained lubricated insulated wire is as large as 0.08 or more and does not show excellent lubricity, and when it exceeds 25 parts by weight, the appearance of the obtained lubricated insulated wire is improved. This is to cause an abnormality.

A solvent that dissolves the above-mentioned main components is used for the lubricous coating as needed. As the solvent, a solvent that can dissolve the above-mentioned resin, for example, polyamideimide, and use the solution as it is as a varnish is preferable. For example, benzene, toluene, xylene, N, N-dimethylformamide, ethylbenzene, cumene, pentylbenzene, acetic ester, alcohol, N-methyl-2-
Pyrrolidone, N, N-dimethylacetamide, m-cresol, p-cresol and various xylenol-based solvents are preferred. Further, the viscosity of the polymer solution can be adjusted by using toluene, xylene, solvent naphtha, acetone, methyl ethyl ketone, cyclohexanone, cellosolve acetate or the like.

Further, the lubricating paint of the present invention is preferably one in which a varnish of the above-mentioned resin component and a solvent is mixed with a lubricant which is a polycondensate, but the lubricant may be directly dissolved in the solvent and used. it can.

In addition to the lubricant, the varnish or solvent may be any one of other thermoplastic resins, thermosetting resins, fillers, pigments, dyes, surfactants, etc., as long as the characteristics thereof are not impaired. Alternatively, two or more kinds may be appropriately blended as needed. Further, an inorganic filler can be appropriately mixed.

As the thermoplastic resin, balsam, copearl, dammer, shellac, fluororesin, polyethylene terephthalate and the like are also preferably used, and these can be used alone or in combination of two or more kinds.

As the inorganic filler, metal sulfides, metal selenides, metal tellurium compounds, metal halides, metal nitrides, metal oxides, metal carbides and the like are preferably used. Specifically, as the metal sulfide, ZrS ₂ , V
_{S 2, NbS 2, TaS 2} , MoS 2, WS 2, ReS 2 , etc.,
Examples of the metal selenium compound include WSe ₂ , MoSe ₂ , and Nb.
Se ₂ , ZrSe ₂ , TaSe _{2 and the} like, metal tellurides such as NbTe ₂ , TaTe ₂ and WTe ₂ , and metal halides such as CdCl ₂ , CdI ₂ , CdBr ₂ and C
Examples of metal nitrides such as aF ₂ and BaF ₂ include BN and SiN.
_As the metal oxide of _4, etc., mica, Sb ₂ O _{3 and the} like are preferably used. These inorganic fillers may be used alone or 2
A mixture of two or more species can be used.

When the insulated wire of the present invention is used for high-voltage equipment, it is particularly preferable to use an inorganic filler exhibiting semiconductivity as the above-mentioned filler because an electric field relaxation effect can be expected.

The lubricating layer is provided on a conductor made of copper or the like with an insulating film interposed. As the insulating coating, a known insulating coating material such as polyamide-imide, polyester, polyester-imide, polyurethane, polyvinyl formal, polyhydantoin, polyester amide imide, polyester amide, polyamide, polyvinyl butyral, epoxy is applied on the conductor and baked. It is formed.

The layer thickness of the lubricating layer is preferably 4 to 19 μm. If the layer thickness is less than 4 μm, the abrasion resistance may decrease, and if it is greater than 19 μm, the appearance may be poor.

Since the lubricity insulated wire of the present invention has improved lubricity, it is possible to suppress mechanical damage and the like. In addition, since the lubricant in the lubricating layer formed in the outermost layer has high heat resistance,
Withstands heating during baking, etc., and does not impair lubricity.

[0025]

[Example] A film thickness of 28 μm on a conductor (diameter: 1.0 mm)
In order to form a lubricating layer, a polyester imide was baked and coated so as to obtain an insulated wire, and a lubricating coating was applied, and baked at 400 ° C. at a linear speed of 20 m / min. The layer thickness of the lubricating layer was 14 μm. Lubricating paint is polyamide-imide paint ("HI-406D" manufactured by Hitachi Chemical Co., Ltd.)
As a lubricant, a polycondensation product of ethylenediamine and a fatty acid (“Light Amide WH-255”, Kyoeisha Chemical Co., Ltd.)
Made, molecular weight: about 800, "Light Amide WH-21
5 "Kyoeisha Chemical Co., Ltd., molecular weight: about 700) was used.

The static friction coefficient and the dielectric breakdown voltage were measured for the lubricated insulated wire produced by using various lubricative coatings in which the mixing ratio of the lubricant was changed with respect to 100 parts by weight of the polyamide-imide coating. Further, as the lubricant, instead of the polycondensate of ethylenediamine and fatty acid having a molecular weight of 500 or more, a mixture of polycondensate of ethylenediamine and fatty acid having a molecular weight of less than 500 (No. 5) and polyethylene powder were blended. The insulated wire was similarly manufactured using the thing (No. 6), and the same test was done. Table 1 shows the test results.
Shown in The static friction coefficient was measured with an electric wire slip tester (manufactured by Toyo Seiki Co., Ltd.) under a load of 200 g.

[0027]

[Table 1]

From Table 1, No. corresponding to the present invention is shown. Two
It can be seen that those of Nos. 3 and 4 have a small static friction coefficient and excellent lubricity. On the other hand, No. 1 with a small lubricant compounding part. 1, N having a lubricant molecular weight of less than 500
o. No. 5, N using polyethylene powder as a lubricant
o. It can be seen that No. 6 is inferior in lubricity to the insulated wire of the present invention.

[0029]

The lubricating insulated wire of the present invention has a resin content
It is characterized in that a coating material having a molecular weight of 500 or more and a polycondensation product of ethylenediamine and a fatty acid of 0.05 to 25 parts by weight with respect to 00 parts by weight is applied to the outermost layer and baked. Since it has excellent lubricity and heat resistance, it does not impair lubricity even if it is heated during baking, and can be used under severe conditions such as when it is used in a high-speed automatic winding machine. , Less susceptible to mechanical damage, and less likely to cause problems such as layer shorts and poor grounding.

Claims (2)

[Claims] 1. A coating composition containing 0.05 to 25 parts by weight of a polycondensation product of ethylenediamine and a fatty acid having a molecular weight of 500 or more with respect to 100 parts by weight of a resin component is applied to the outermost layer and baked. Lubricating insulated wire characterized by the following. 2. A lubricity insulated electric wire, characterized in that a paint having a molecular weight of 500 or more and in which a polycondensation product of ethylenediamine and a fatty acid is dissolved in a solvent is applied to the outermost layer and baked.