JP2002042565A - Self lubricating insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self lubricating insulated wire which has an insulation layer with a smooth surface and good smoothness to meet higher speed of winding the wire and increase of an occupation rate in recent years and prevent degradation of characteristics of the wire caused by aging and moisture absorption and has a good appearance and stability of an insulation paint for forming the insulation layer. SOLUTION: The self lubricating insulated wire is formed from the insulation layer coated with insulating coating on a conductor directly or via other insulation layers and baked. The insulating coating contains at least one wax composition selected from a) a polyalkyleneglycol or/and a derivative and b) a natural wax and a polyolefin wax.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-lubricating insulated wire in which an insulating layer formed on the surface itself has good sliding properties.

[0002]

2. Description of the Related Art Generally, insulated wires are liable to cause damage or disconnection of an insulating layer due to a load applied during manufacturing and processing.
To reduce this load, it is effective to increase the slipperiness of the surface of the insulated wire to lower the frictional resistance. Initially, lubricating oil, paraffins, A method of applying a lubricating component such as wax, a method of providing an overcoat layer made of a resin having a low friction coefficient such as nylon or polyethylene, and a method of including the lubricating component in an insulating layer have been adopted.

However, in recent years, there has been a tendency to increase the winding speed and the occupancy rate (the amount of electric wires arranged in a certain space) for the purpose of speeding up the entire manufacturing and processing steps and improving the space efficiency. Accordingly, the load applied to the insulated wire is inevitably increased, and the above means can no longer cope with the problem. Therefore, as an alternative to the above, a method of blending a powder of polyethylene, fluorine resin, silicone resin or the like into the insulating layer is often used, but these resin powders are uniformly dispersed in the insulating paint for forming the insulating layer. Since it is difficult to disperse, the stability of the coating material is deteriorated, and the mechanical and physical properties of the insulating layer are lowered, and the appearance is easily lowered due to the uneven dispersion of the fine powder.

On the other hand, in light of the above circumstances, the present applicant has previously disclosed in Japanese Patent Application Laid-Open No. 7-220530 a self-lubricating device having an insulating layer formed by applying and baking an insulating paint containing polyalkylene glycol or / and a derivative thereof. Has proposed a conductive insulated wire. This insulated wire is excellent in that the insulating layer itself on the surface exhibits good slipperiness, has sufficient inherent wire characteristics such as heat resistance, and the insulating paint for forming the insulating layer has good stability. It has the features.

[0005]

However, the self-lubricating insulated wire proposed above has been studied by subsequent studies to provide the insulating layer with a high degree of lubricity, and to provide the above-mentioned polyalkylene glycol and / or a derivative thereof. Although it was necessary to increase the blending amount, it was found that when the blending amount was increased, the water absorption of the insulating layer became strong, and the electric wire characteristics were likely to deteriorate over time due to moisture absorption.

[0006]

Means for Solving the Problems The present inventors have made intensive studies in view of the above situation, and as a result, have found that polyalkylene glycol and / or a derivative thereof can be used in an insulating paint used for forming an insulating layer. When a wax component selected from wax and polyolefin wax is contained, the water absorption of the formed insulating layer is suppressed, and it becomes difficult to cause deterioration of electric wire characteristics over time, and the slipperiness of the insulating layer is remarkable. It has been found that a high-performance self-lubricating insulated wire capable of sufficiently coping with the recent increase in winding speed and increase in occupancy can be obtained, and that the stability of the insulating paint is also improved. Was reached.

That is, the self-lubricating insulated wire according to claim 1 of the present invention comprises a) a polyalkylene glycol or / and a derivative thereof, and b) a natural wax, directly or via another insulating layer on a conductor. And an insulating layer formed by applying and baking an insulating paint containing at least one wax component selected from polyolefin wax.

According to a second aspect of the present invention, in the self-lubricating insulated wire according to the first aspect, the polyalkylene glycol of the component a and the derivative thereof have an average molecular weight of 300 to 3000. Things.

A third aspect of the present invention is the self-lubricating insulated wire according to the first or second aspect, wherein the polyalkylene glycol derivative of the component a is a fatty acid monoester or diester of a polyalkylene glycol. is there.

According to a fourth aspect of the present invention, in the self-lubricating insulated wire according to any one of the first to third aspects, the compounding amount of the component a polyalkylene glycol and / or a derivative thereof in the insulating coating is different from that of the insulating coating. In the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the resin component, and
The composition employs 25 to 200% by weight of the wax component.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The self-lubricating insulated wire of the present invention comprises, on its surface, a) a polyalkylene glycol or / and a derivative thereof, and b) at least one wax component selected from natural waxes and polyolefin waxes. Has an insulating layer formed by applying and baking an insulating coating containing the same. Since the insulating layer has a small water absorption, it does not easily cause deterioration of electric wire characteristics over time due to moisture absorption, and the insulating layer is very excellent. Due to its self-lubricating property, it exhibits extremely excellent slipperiness that can sufficiently cope with the recent increase in winding speed and increase in occupancy. Further, since the insulating paint has good stability, even if the paint is used after being stored for a long period of time, it is difficult to cause deterioration of various wire properties including the slipperiness, and an insulated wire having a smooth surface and a good appearance is obtained. Can be

It is not clear why the water absorption of the insulating layer is reduced as described above, but it is considered that the water repellency of the wax component offsets the water absorption of the polyalkylene glycol and its derivative. . With respect to the self-lubricating property of the insulating layer, the wax component has an excellent lubricating function, and the polyalkylene glycol and its derivative also have a lubricating function in molecular structure and have compatibility with the wax component, In addition, since it is soluble in a solvent generally used for insulating coatings and is uniformly dissolved in the coating, it acts as a dispersant for the wax components, and thus a wax component having an excellent lubricating function is contained in the insulating layer. It is considered that they are uniformly contained, and both components appearing on the surface of the insulating layer cooperate to exhibit a high lubricating effect efficiently. On the other hand, in the insulating paint, as described above, since the polyalkylene glycol and its derivative and the wax component are both uniformly dissolved in the paint and mixed with the resin component, it is assumed that the stability of the paint is improved.

[0013] Thus, any of the polyalkylene glycols of the component a and the derivatives thereof can be used to uniformly dissolve the natural wax and the polyolefin wax of the component b into the insulating paint. Polyalkylene glycol derivatives obtained by reacting an aliphatic hydrocarbon derivative with a terminal hydroxyl group, in particular, fatty acid monoesters or diesters of polyalkylene glycol are preferable, and even in these fatty acid monoesters and diesters, the fatty acid has 16 or more carbon atoms. Some are best. This is because, as the number of carbon atoms of the aliphatic hydrocarbon group derived from the above-mentioned fatty acid monoester and diester increases, it becomes more compatible with the natural wax and the polyolefin wax of the component b, and based on the aliphatic hydrocarbon group. The lubrication effect is also improved.

The polyalkylene glycol and the derivative thereof preferably have an average molecular weight of the polyalkylene glycol component in the range of 300 to 3,000. That is, if the average molecular weight is too small,
The water absorption of the insulating paint and the insulating layer formed therefrom is increased, and the deterioration of the insulated wire over time due to moisture absorption is likely to occur. If the average molecular weight is too large, b
The compatibility with the component natural wax and polyolefin wax is reduced. The polyalkylene glycol component may be any of polyethylene glycol, polypropylene glycol, and polyethylene-propylene glycol, but polyethylene glycol is particularly preferred. The polyalkylene glycol of component a and derivatives thereof may be used in combination of two or more.

The compounding amount of the polyalkylene glycol of the component a and / or the derivative thereof is determined based on the resin component 1 of the insulating paint.
0.1 to 10 parts by weight with respect to 00 parts by weight, and 25 to 20 with respect to the wax component of the component b.
The range which becomes 0 weight% is preferable. That is, with respect to the former compounding amount with respect to the resin component, if it is less than 0.1 part by weight, a substantial compounding effect cannot be obtained, and if it exceeds 10 parts by weight, it is difficult to sufficiently suppress the water absorption of the insulating layer. become.
Also, regarding the compounding ratio to the latter wax component,
If the content is less than 25% by weight, the wax component cannot be uniformly dissolved in the insulating paint. If the content exceeds 200% by weight, the lubricating function of the wax component is impaired, so that the self-lubricating property of the insulating layer is rather reduced. .

The wax component of component b is not particularly limited as long as it belongs to either natural wax or polyolefin wax, and either one of natural wax and polyolefin wax may be used, or both may be used in combination. It is also possible to use a plurality of natural waxes or a combination of polyolefin waxes. Thus, suitable natural waxes include carnauba wax, lanolin wax, beeswax, montan wax, candelilla wax, rice wax, ceresin, spermaceti, and the like. Suitable polyolefin waxes include polyethylene wax, polypropylene wax, Fischer-Tropsch wax and the like.

The compounding amount of the wax component is preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the resin component of the insulating coating. If less than 0.1 part by weight, a substantial compounding effect cannot be obtained. Conversely, if it exceeds 10 parts by weight, the dispersibility in the insulating paint will be deteriorated, and the surface of the formed insulating layer will be roughened, and the appearance of the insulated wire will be deteriorated.

In order to manufacture the self-lubricating insulated wire of the present invention, the above-mentioned components a and b are blended into an insulating paint, and this insulating paint is applied directly to a conductor such as a soft copper wire or another insulating material serving as a base. An insulating layer having a required thickness may be formed by coating and baking through the layers. The other insulating layer serving as a base may be a normal insulating layer mainly for electric insulation, or a fusion insulating layer for imparting self-fusibility when used for windings of motors, transformers, coils, and the like. There are layers.

The insulating coating containing the components a and b may be any one generally used for an enameled wire, and examples thereof include polyurethane coatings, polyester coatings, polyesterimide coatings, polyamideimide coatings, and the like.
These modified paints are exemplified. Further, as an insulating paint for forming a fusion insulating layer as a base, for example,
Examples include polyamide-based paints, polyester-based paints, epoxy-based paints, polyvinyl butyral paints, and mixed paints thereof. Further, as an insulating paint for forming a normal insulating layer as a base, the same as the above-mentioned insulating paint which mixes the components a and b can be used.

The thickness of the insulating layer containing the a and b components in the self-lubricating insulated wire of the present invention depends on the diameter of the conductor, the type of resin constituting the insulating layer, the use of the wire, and the presence or absence of another insulating layer as a base. Generally, it is about 5 to 50 μm although it varies depending on the like.

[0021]

EXAMPLES Examples of the present invention will be specifically described below in comparison with comparative examples. The details of the insulating paint used in these Examples and Comparative Examples and the lubricating components blended therein are as follows.

<Insulating paint> Polyurethane insulating paint: TPU-510 manufactured by Totoku Paint Co., Ltd.
0 Polyester insulation paint: DE-22 manufactured by Nitto Shinko
0 Polyamide-imide insulating paint: HI-40 manufactured by Hitachi Chemical Co., Ltd.
5

<Lubricant component> PEG-200: polyethylene glycol having an average molecular weight of 200 PEG-300: polyethylene glycol having an average molecular weight of 300 PEG-2000: polyethylene glycol having an average molecular weight of 2000 PEG-3500: polyethylene glycol PEG derivative A having an average molecular weight of 3,500 ... Polyethylene glycol monostearate (average molecular weight of polyethylene glycol component 100)
0) PEG derivative B: polyethylene glycoldiolate (average molecular weight of polyethylene glycol component: 600) Natural wax A: montan wax (S-WAX manufactured by BSF Japan) Natural wax B: carnauba wax (T manufactured by Toyo Petrite) No.-1) PO wax A: polyethylene wax (151P manufactured by Sanyo Chemical) PO wax B: polypropylene wax (660P manufactured by Sanyo Chemical)

Examples 1 to 20 Insulating paints shown in Tables 1 and 2 below were prepared by adding resin components 1
To 100 parts by weight, each component described in the same table was added in the indicated parts by weight, and the mixture was heated and stirred at 40 to 60 ° C. for 1 hour to prepare an insulating paint. Then, the insulating paint was applied on a 0.5 mm diameter soft copper wire a plurality of times and baked to form an insulating layer having a thickness of 23 μm, thereby producing a self-lubricating insulated wire.

Comparative Examples 1 to 7 To the insulating coatings shown in Table 3 below, each component shown in the same table was added in 100 parts by weight of the resin component in the indicated parts by weight. Was prepared, and a self-lubricating insulated wire was manufactured using this insulating paint in the same manner as in the above example.

Comparative Example 8 Using the polyurethane insulating paint used in Example 1 without blending a lubricating component, solid paraffin was applied to the surface of an insulating layer formed in the same manner as in Example 1 to produce an insulated wire. .

With respect to the insulated wires of the above Examples and Comparative Examples, the appearance (according to JIS C 30034.), the slipperiness, the pinhole after the moisture absorption test, and the paint stability were respectively evaluated by test. The results are shown in Tables 1 and 2 below. In addition, each test method of a sliding property, a pinhole after a moisture absorption test, and paint stability is as follows. The pinholes after the moisture absorption test generate pinholes when the molecular chain of the resin component breaks due to the presence of water in the insulating layer when tensile stress is applied. It becomes an index of the deterioration of the electric wire characteristic, and the larger the numerical value, the more easily the electric wire deteriorates.

[Sliding property]: Two insulated wires are attached in parallel to a metal block, and these are fixed on a plane.
Lay each other on the same parallel insulated wire so that the wires cross each other at right angles.Measure the minimum load required for the former metal block to move along the latter insulated wire, and determine the minimum The load (g) / the load (g) of the metal block was expressed as slipperiness.

[Pinhole after Moisture Absorption Test] A test wire having a length of 15 m was left in a thermo-hygrostat at a temperature of 40 ° C. and a humidity of 99.5% or more for 3 months, and a pin was inserted in accordance with JIS C 3003.6. A Hall test was performed.

[Paint stability] Inner diameter 1 mm, length 120 m
When 10 ml of the insulating paint is placed in a test tube having a length of m, the test tube is immersed in a high-temperature water bath at 60 ° C. and left for 2 weeks, and then visually observed, and when a lubricating component in the paint is separated or the paint is clouded. Was determined as "poor", and the case where it did not occur was determined as "good".

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

As can be seen from Tables 1 to 3, the self-lubricating insulated wire of the present invention exhibits extremely excellent slipperiness, hardly causes deterioration of wire characteristics over time due to moisture absorption, and has an appearance and insulating paint. It can also be seen that the stability of is good. On the other hand, in the insulated wires using only polyethylene glycol as the lubricating component (Comparative Examples 1 and 2), since the water absorption of the insulating layer is large, the deterioration of the wire characteristics over time due to moisture absorption tends to occur, and the slipperiness is increased. It turns out that it is slightly inferior in terms of aspect. Also, the insulated wire using only polyethylene glycol monostearate, which is excellent in lubricating action, as a lubricating component (Comparative Example 3) is slightly inferior in slipperiness, and the insulated wire using only one of natural wax and polyolefin wax (Comparative Example) 4,
In the case of 5), the appearance is poor and the stability of the insulating paint is poor, and the stability of the insulating paint is poor even for insulated wires using both natural wax and polyolefin wax (Comparative Examples 6 and 7). It is clear that the insulated wire (Comparative Example 6) applied to the surface without containing it does not provide sufficient slip properties.

On the other hand, Examples 1, 2 and 4 and Examples 9 and 10
When the average molecular weight of the polyalkylene glycol component in the polyalkylene glycol or its derivative is less than 300 (Example 9), the water absorption of the insulating layer cannot be sufficiently suppressed, and when the average molecular weight exceeds 3000 (Example 9). 1
0) suggests that the stability of the insulating paint is deteriorated. Also, from the comparison between Examples 2 and 5 and Examples 7 and 8, if the blending amount of polyalkylene glycol or a derivative thereof is too small with respect to the total amount of natural wax and polyolefin wax, the stability of the insulating paint decreases. (Example 7) Conversely, if the amount is too large, the lubricity becomes insufficient (Example 8). Furthermore, in comparison between polyethylene glycol and its derivatives, the latter polyethylene glycol derivatives generally give better results. As for the wax component, the slip property tends to be higher when the natural wax and the polyolefin wax are used in combination, but a sufficient slip property is obtained with only one of the components (Examples 17 to 20).

[0036]

According to the first aspect of the present invention, a self-lubricating insulated wire having a slippery surface insulating layer itself can sufficiently cope with recent increases in winding speed and occupancy. An object is provided which has high self-lubricating property, hardly causes deterioration of electric wire characteristics over time due to moisture absorption, has good appearance, and has good stability of an insulating paint for forming an insulating layer.

According to the second aspect of the present invention, the self-lubricating insulated wire has the advantage that the deterioration of the wire characteristics over time due to moisture absorption is less likely to occur, and the insulating paint can be more reliably stabilized. .

According to the third and fourth aspects of the present invention, there is an advantage that the slipperiness of the self-lubricating insulated wire and the stability of the insulating paint are further improved.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 107/34 C10M 107/34 109/00 109/00 111/00 111/00 H01B 7/00 303 H01B 7 / 00 303 // C10N 20:04 C10N 20:04 40:16 40:16 50:08 50:08 (72) Inventor Hiroshi Ito 1073 Eda, Shigaraki-cho, Koka-gun, Shiga Prefecture, Japan F term (reference) 4H104 BB42A BB47A CA01A CB14A DA05A EA03A PA12 QA12 4J038 BA211 BA212 CB001 CB002 CB141 CB142 CB181 CB182 DF011 DF012 MA02 NA01 NA21 PA19 PB06 PB09 PC02 PC08 5G309 CA05 MA16

Claims (4)

[Claims] 1. Directly or via another insulating layer on a conductor, a) a polyalkylene glycol or / and a derivative thereof, and b) at least one wax component selected from natural waxes and polyolefin waxes. A self-lubricating insulated wire with an insulating layer formed by applying and baking an insulating paint. 2. The self-lubricating insulated wire according to claim 1, wherein the average molecular weight of the polyalkylene glycol component in the polyalkylene glycol component a and the derivative thereof is 300 to 3,000. 3. The self-lubricating insulated wire according to claim 1, wherein the polyalkylene glycol derivative of the component a is a fatty acid monoester or diester of a polyalkylene glycol. 4. The compounding amount of the component a polyalkylene glycol or / and a derivative thereof in the insulating coating is in the range of 0.1 to 10 parts by weight based on 100 parts by weight of the resin component of the insulating coating. The self-lubricating insulated wire according to any one of claims 1 to 3, wherein the content is 25 to 200% by weight based on the wax component of the component (b).