JPH0810567B2 - Insulated wire with self-lubricating property - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an insulated wire having excellent self-lubricating property.

(Prior Art) Generally, an insulated wire covered with an electrical insulator is used in large quantities for various electric devices.

In recent years, when manufacturing this electric device, the insulated wire is lowered into a coil shape, but speeding up and rationalization are actively being carried out in this processing process, and coil winding work can be done from the conventional manual winding process. High-speed mechanical winding is being introduced by the introduction of an automatic winding machine, etc. In this case, a large tension is applied to the insulated wire when forming a coil and the work is performed at high speed so Since it is inevitably susceptible to damage due to friction or the like, the reliability of the coil itself is significantly reduced.

Also, in forming the coil, it is necessary to reduce the space factor of the insulated wire as much as possible in order to reduce the cost of the entire equipment and to put it in a state in which it can be used with confidence. It is necessary to do. However, on the other hand, it was extremely difficult to carry out the coil winding work under such severe conditions.

Therefore, the friction coefficient between the electric wires is considered as a factor for facilitating the coil winding work. That is, the lower the coefficient of friction, the easier the coil winding work can be done, and at the same time, the one that does not damage the insulated wire after the coil winding process can be obtained. From this point of view, as a means to reduce the friction coefficient between insulated wires,
Wax is applied to the surface of the insulated wire, or an insulated wire prepared by coating and baking an insulating coating material containing a thermoplastic resin wax such as polyethylene is used.

However, even if wax or the like is applied to the insulated wire, the expected reduction in the friction coefficient cannot be expected, and since the friction coefficient depends on the application amount, it must be applied uniformly and adjustment of the application amount In addition, workability is difficult. In addition, the applied waxes could not be used in air conditioners, compressors for refrigerators, etc. where the coil itself is immersed in a refrigerant and refrigerating machine oil for use. Insulated wires obtained by coating and baking an insulating resin paint mixed with a lubricant such as polyethylene have large differences in the effect of the lubricant depending on the type of insulating resin paint.
Even if a lubricant was blended, a lubricant could not be obtained, and the workability was poor because it had to be applied only to the outermost layer of the insulated wire. Therefore, there has been a demand for the appearance of an insulated wire which has good workability in the manufacturing process and has a uniform low friction coefficient.

(Problems to be Solved by the Invention) As a result of intensive research, the present invention has developed an insulated electric wire having excellent lubricity by facilitating workability as a result of intensive research on imparting lubricity to the insulating film itself of an enamel insulated electric wire. It was done.

(Means for Solving Problems) The insulated wire of the present invention is C ₁₅ to 100 parts by weight of the resin content in the baking type insulating coating material directly on the conductor or through another insulating layer.
A baking coating of an insulating paint was prepared by mixing 0.2 to 5.0 parts by weight of a monoalkyl glycerin or dialkyl glycerin ester obtained by reacting a C ₂₇ linear fatty acid with glycerin and 0.1 to 3.0 parts by weight of polyorganosiloxane or a derivative thereof. It is characterized by that.

The mono- or dialkyl glycerin ester having a linear alkyl group referred to in the present invention is a linear alkyl group having a carbon number of 15 to 27, for example, And the like.

The polyorganosiloxane is represented by the following formula.

X, X 'is -H, -OH, or the equivalent of R, R', and R, R 'is-
Saturated or unsaturated alkyl groups represented by CH ₃ , —C ₂ H ₁ , —C ₆ H _5, etc., n is 5 to 30.

As a specific example The baking type insulating coating material referred to in the present invention is not particularly limited, but coating materials made of resins such as polyester polyimide, polyamide, polyamide imide, polyester imide, polyurethane polyester amide imide and epoxy are preferable.

Therefore, the reason why the blending amount of the monoalkyl glycerin ester or dialkyl glycerin ester is limited to 0.2 to 5.0 parts by weight with respect to 100 parts by weight of the resin component in the insulating coating is that the insulating wire obtained in the case of 0.2 parts by weight ends. This is because the effect of improving the surface lubricity of the insulating coating layer cannot be obtained, and when it exceeds 5.0 parts by weight, the strength of the obtained insulating coating is lowered or problems such as peeling occur.

In addition, the amount of polyorganosiloxane or its derivative
The reason for limiting to 0.1 to 3.0 parts by weight is that the effect of improving the lubricity of the insulating film of the insulated wire obtained cannot be obtained at the end of 0.1 parts by weight, and if it exceeds 3.0 parts by weight, the insulating film becomes This is because a phenomenon of poor appearance such as bumps and blisters occurs.

Thus, it is an essential component to blend both the monoalkyl glycerin or dialkyl glycerin ester and the polyorganosiloxane or its derivative into the insulating coating used in the present invention, and if either one is not blended, sufficient lubricity is obtained. The improvement effect cannot be obtained.

Another object of the present invention is to provide an insulated electric wire having excellent self-lubricating property. Since this self-lubricating property is caused by the surface condition of the insulating coating layer, a conductor may be used when forming the insulating coating layer. Insulating paint containing the above additives may be directly applied and baked on the surface, or another paint may be applied and baked in advance to form an insulating wire on the outermost layer of the insulated wire. May be.

(Example) Examples (1) to (5) and Comparative Examples (1) to (7) Commercially available polyurethane insulating paint TPU on a copper wire having a conductor diameter of 0.5 mm.
-F ₂ -50NCA (trade name, manufactured by Tokushu Paint Co., Ltd.) with a film thickness of 15μ
Was applied and baked at 400 ° C to obtain a polyurethane insulated wire.

Further, an insulating paint having a composition shown in Table 1 was applied onto the polyurethane insulated wire and baked at 400 ° C. to obtain a self-lubricating insulated wire of the present invention and a self-lubricating insulated wire of a comparative example.

The thus-obtained insulated wire of the present invention and the insulated wire of the comparative example were measured for one-way friction property, reciprocating friction property and static friction coefficient in order to compare the performance. The results are as shown in Table 1.

Examples (6) to (9) and Comparative Examples (8) to (10) Commercially available polyesterimide insulating paint Isomid 40VT (trade name, manufactured by Nippon Schenectady Co., Ltd.) is applied onto a copper wire having a conductor diameter of 0.5 mm. Film thickness is 15μ after baking at 500 ℃
I got a polyester imide insulated wire.

Further, an insulating paint having the composition shown in Table 2 is applied onto the polyesterimide insulated wire and baked at 500 ° C. to form a self-lubricating polyesterimide insulated wire of the present invention and a comparative example self-lubricating polyesterimide insulated wire having a film thickness of 2 μm. I got it.

Comparative Example (11) Commercially available polyester imide insulating paint Isomid 40VT (trade name of Nichitsu Schenectady Co., Ltd.) was applied on a copper wire with a conductor diameter of 0.5 mm and baked at 500 ° C to obtain a film thickness of 17μ.
I got a polyester imide insulated wire.

Furthermore, a melting point of 140 ° F on this polyesterimide insulated wire
A paraffin wax of (60 ° C.) was uniformly applied to a wax solution in which normal hexane had a solid content of 1%, and the mixture was naturally dried to obtain a self-lubricating insulated wire of a comparative example.

In order to compare the performances of the self-lubricating insulated wire of the present invention thus obtained and the self-lubricating insulated wire of the comparative example, the one-way friction property, reciprocating friction property and static friction coefficient were measured. The results are shown in Table 2 together.

As is clear from Tables 1 and 2, it was confirmed that the self-lubricating insulated wire of the present invention has excellent wear resistance and an extremely small friction coefficient.

(Effect) As described in detail above, the insulated wire having self-lubricating property of the present invention has excellent self-lubricating property, and when forming a coil, it exhibits an excellent winding property in coil processing by an automatic winding machine or the like. The space factor can be reduced. Further, it is industrially extremely useful in improving the reliability of the equipment and reducing the cost.

Claims (2)

[Claims] 1. C _{15 to} C ₂₇ relative to 100 parts by weight of the resin component in the baking type insulating coating material directly on the conductor or through another insulating layer.
Monoalkyl glycerin or dialkyl glycerin ester obtained by reacting linear fatty acid of 1 with glycerin.
An insulated wire having a self-lubricating property, comprising a baking coating layer of an insulating paint containing 2 to 5.0 parts by weight and 0.1 to 3.0 parts by weight of polyorganosiloxane or a derivative thereof. 2. The resin in the baking type insulating paint is polyester.
The insulated electric wire having self-lubricating property according to claim 1, which is selected from polyimide, polyamide, polyamideimide, polyesterimide, polyurethane, polyesteramideimide, and epoxy resin.