JP2566473B2 - Lubricant composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lubricant composition that provides a self-lubricating insulated wire having excellent self-lubricating property and improved deterioration in workability.

(Prior art and its problems) In recent years, in order to speed up the process in coil winding processing of telecommunications equipment, etc., in electric manufacturers,
High-speed automatic winding machines are becoming widely used.
Therefore, the surface of the insulating layer of the insulated wire is required to have sufficient slipperiness or abrasion resistance. That is, during the winding process, the insulated wire receives friction at the needle and the pulley portion, and the insulating layer is mechanically damaged. Therefore, the defect rate increases as the winding speed increases, and reduction of this defect rate is required.

In the case of coil forming, if the slipperiness between the insulated wires and between the insulated wires and the device is poor, the coil space factor becomes large, and the ease of loading into the motor slot is reduced. Accompanying these problems, insulated electric wires having good slipperiness have been demanded.

In order to meet these requirements, conventionally, a thin lubricant such as wax or lubricating oil was applied on the insulated wire to lower the friction coefficient of the insulated wire and minimize mechanical damage due to friction. Has been done. However,
This method has the drawback that it is extremely difficult to control the amount of lubricant applied and to evenly apply the lubricant to the outer layer of the insulated wire.

Furthermore, since dust and dirt in the air adhere to the insulated wire coated with these lubricants, a step of solvent-cleaning the molded product after coil molding is required.

Therefore, a method of applying a paint mainly composed of a polyamide resin mainly composed of 6- or 6,6-nylon on an insulated wire is mainly used. However, when a polyamide resin paint is applied and baked, Has the drawback that the softening resistance of the insulated wire is significantly reduced.

Further, in order to obtain slipperiness, it is necessary to apply and bake a film having a certain thickness or more, which causes a problem that the coil space factor becomes large.

Therefore, the object of the present invention is to solve the above-mentioned problems of the conventional technique and to have excellent heat resistance as compared with conventional insulated wires,
It is an object of the present invention to provide a lubricant composition that provides an insulated electric wire that exhibits equivalent or higher properties such as abrasion resistance and slipperiness, and that has excellent self-lubricating properties in coil winding processability.

(Means for Solving Problems) The above object is achieved by the present invention described below.

That is, the present invention has the general formula HO- (CH _{2) n} -OH alone or a mixture and tetraalkyl titanates long chain aliphatic diols represented by (wherein n is a number from 16 to 20), tetra-aryl titanate And a lubricant composition obtained by dissolving and / or suspending in a solvent at least one organic titanate compound selected from these polymers.

(Operation) By using a lubricant composition having a specific composition,
Even with a very thin lubrication layer, it has excellent heat resistance compared to conventional insulated wires, and also shows the same or better characteristics such as wear resistance and slipperiness, and has excellent coil winding workability. An insulated wire having self-lubricating property is provided.

(Preferred Embodiment) Next, the present invention will be described in more detail with reference to preferred embodiments.

The long chain aliphatic diol used in the present invention is a long chain aliphatic diol having 16 to 20 carbon atoms or a mixture thereof,
In the case of an aliphatic diol having a carbon number less than the above range, the slipperiness of the obtained insulated wire is insufficient, while in the case of an aliphatic diol having a carbon number exceeding the above range, the solution stability of the solvent is stable. I am unsatisfied in terms of sex.

An example of such a long-chain aliphatic diol that can be easily obtained from the market and used is SL which is a mixture of an aliphatic diol having 16 carbon atoms and an aliphatic diol having 20 carbon atoms.
20 Dio1 (trade name, made by Okamura Oil).

Examples of the organic titanate compound used in the present invention include tetraalkyl titanates such as tetraisopropyl titanate, tetrabutyl titanate, tetrahexyl titanate, tetramethyl titanate, tetrapropyl titanate and tetraoctyl titanate, and tetraaryl titanate such as tetracresyl titanate and These weight bodies are mentioned.

The compounding ratio of the long-chain aliphatic diol and the organic titanate compound used in the present invention is preferably 1 to 110 parts by weight of the organic titanate compound to 100 parts by weight of the long-chain aliphatic diol, and the organic titanate compound is 1 part by weight. If it is less than 100 parts by weight, the dielectric breakdown voltage of the insulated wire will be lowered, and if it exceeds 110 parts by weight, slipperiness will be poor.

Examples of the solvent used to dissolve or suspend the above components, a solvent having a phenolic hydroxyl group, for example,
Phenol, o-cresol, m-cresol, p-cresol, 2,3-xylenol, 2,4-xylenol, 2,
5-xylenol, 2,6-xylenol, 3,4-xylenol, 3,5-xylenol, on-propylphenol, 2,4,6-trimethylphenol, 2,3,5-trimethylphenol, 2,4 It is preferable to use cresylic acid which is 5,5-trimethylphenol, 4-ethyl-2-methylphenol, 5-ethyl-2-methylphenol and a mixture thereof. Further, as the diluent, for example, aliphatic hydrocarbons, aromatic hydrocarbons, ethers, acetals,
Ketones, esters and the like can be used.

Examples of aliphatic hydrocarbons and aromatic hydrocarbons include n-heptane, n-octane, cyclohexane, decalin, dipentene, pinene, p-menthane, decane,
Dodecane, tetradecane, benzene, toluene, xylene, ethylbenzene, diethylbenzene, isopropylbenzene, amylbenzene, p-cymene, tetralin or mixtures thereof, petroleum naphtha, coal tar naphtha,
Solvent naphtha and the like can be mentioned.

The lubricant composition of the present invention simply dissolves the above long-chain aliphatic diol and organic titanate compound in the above solvent and / or
Alternatively, it can be produced by suspending. The solid content concentration and viscosity of the obtained lubricant composition are arbitrary, but the solid content is about 10 to 25% by weight, and the viscosity is about 10 to 40 cP.
Is preferred.

The self-lubricating insulated electric wire according to the present invention can be obtained by applying and baking the above-mentioned lubricant composition of the present invention on the insulating layer of a conventionally known insulated electric wire.

The type of insulated wire used is not particularly limited, and may be any insulated wire such as polyurethane coating, polyester coating, polyesterimide coating, polyimide coating, polyamideimide coating, or the like.

The amount of the lubricant composition applied on the insulated wire is
The thickness after baking may be 0.1 μm or less. Specifically, it is determined each time depending on the type and thickness of the insulated wire. The preferred range is 0.005 to 0.1 μm. If the thickness is less than the above range, the lubricity is insufficient, while if it exceeds the above range, the coil winding workability is insufficient.

The coating and baking method itself may be a conventionally known method,
For example, a self-lubricating insulated wire having a desired performance can be obtained by continuously applying it with a method such as soybean squeezing or felt squeezing and baking at a temperature of about 300 to 500 ° C.

(Effects) According to the present invention as described above, by using a lubricant composition having a specific composition, even if the lubricant layer is very thin, it has excellent heat resistance as compared with a conventional insulated wire. ,
Provided is an insulated electric wire which exhibits the same or better characteristics such as wear resistance and slipperiness, and has self-lubricating property which is excellent in coil winding workability.

(Examples) Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In addition, unless otherwise specified, "parts" and "%" in the text are based on weight.

Example 1 100 parts of long-chain aliphatic diol (SL 20 Dio1) was dissolved and suspended in 523 parts of cresol at room temperature, and then 2 parts of tetrabutyl titanate monomer was added to the solution to give a nonvolatile content of 16.0% and a viscosity.
A 20 cP lubricant composition of the present invention was obtained. The nonvolatile content and the viscosity are measured according to the latest version of JIS C 2351-1988.

On a class 1 polyester insulated electric wire (finishing outer diameter 0.360 mm) with a conductor diameter of 0.32 mm, which has a commercially available polyester insulation coating,
The above lubricant composition is baked at a temperature of 500 ° C. and the take-up speed is 2
A self-lubricating insulated wire of the present invention having a finish diameter of 0.360 mm was obtained by applying and baking once with a felt squeeze under the condition of 0 m / min. The finished outer diameter of this self-lubricating insulated wire is the same as the finished outer diameter of the polyester insulated wire in the unit of 0.001 mm.

About this self-lubricating insulated wire, one-way friction,
The results of measurement of dielectric breakdown voltage, softening resistance, static friction coefficient, etc. are shown in Table 1 below.

The one-way frictional property, the dielectric breakdown voltage, and the softening resistance characteristic test are based on the JIS C 3003-1984 enamel copper wire and enamel aluminum wire test method. The static friction coefficient is measured by a static friction coefficient measuring device manufactured by Toyo Seiki Co., Ltd.

Example 2 The same operation as in Example 1 was repeated except that 100 parts of SL 20 Dio, 475 parts of cresol and 50 parts of tetrabutyl titanate monomer were used to obtain a lubricant composition of the present invention having a nonvolatile content of 15.8% and a viscosity of 19 cP.

Then, the same operation as in Example 1 was conducted to obtain the results shown in Table 1 below.

Example 3 The same operation as in Example 1 was repeated except that 100 parts of SL 20 Dio, 425 parts of cresol and 100 parts of tetrabutyl titanate monomer were used to obtain a lubricant composition of the present invention having a nonvolatile content of 16.1% and a viscosity of 22 cP.

Then, a characteristic test was conducted by the same operation as in Example 1 to obtain the results shown in Table 1 below.

Example 4 Using the lubricant composition of Example 1, the composition was baked on a type 1 polyurethane insulated wire (finishing outer diameter 0.350 mm) having a conductor diameter of 0.32 mm and having a commercially available polyurethane insulating coating, and the baking temperature was 360 ° C. A self-lubricating insulated wire of the present invention having a finish diameter of 0.350 mm was obtained by applying and baking once with a felt squeeze at a take-up speed of 20 m / min. The finished outer diameter of this self-lubricating insulated wire is the same as the finished outer diameter of the polyurethane insulated wire in the unit of 0.001 mm.

Then, a characteristic test was conducted by the same operation as in Example 1 to obtain the results shown in Table 1 below.

Comparative Example 1 The above-mentioned polyester insulated wire was subjected to a characteristic test by the same operation as in Example 1 to obtain the results shown in Table 1 below.

Comparative Example 2 The polyurethane insulated wire was subjected to a characteristic test in the same manner as in Example 1 to obtain the results shown in Table 1 below.

Comparative Example 3 A 6,6-nylon resin was dissolved in a mixed solvent (cresol / naphtha = 75/25) to obtain a lubricant composition of Comparative Example having a nonvolatile content of 16.0% and a viscosity of 2,700 cP.

Apply the above composition once on a class 1 polyester insulated electric wire (finishing outer diameter 0.360 mm) with a conductor diameter of 0.32 mm and a commercially available polyester insulation coating, and apply it once to the die squeezer under the conditions of a baking temperature of 500 ° C and a take-up speed of 20 m / min. And it baked and the self-lubricating insulated electric wire of a comparative example was obtained.

Then, a characteristic test was conducted by the same operation as in Example 1 to obtain the results shown in Table 1 below.

Comparative Example 4 Using 1100 parts of SL 20 Dio and 525 parts of cresol, a lubricant composition of a comparative example having a nonvolatile content of 15.6% and a viscosity of 18 cP was obtained. This composition was applied to a polyester insulated wire and baked to form a lubricating layer, and a characteristic test was conducted in the same manner as in Example 1 to obtain the results shown in Table 1 below.

Comparative Example 5 Using 100 parts of 1,12-dodecanediol, 475 parts of cresol and 50 parts of tetrabutyl titanate monomer, a lubricant composition of Comparative Example having a nonvolatile content of 16.0% and a viscosity of 17 cP was obtained. This composition was applied to a polyester insulated wire and baked to form a lubricating layer, and a characteristic test was conducted in the same manner as in Example 1 to obtain the results shown in Table 1 below.

As is clear from Table 1, the self-lubricating insulated wire of the present invention has a low static friction coefficient and excellent softening resistance.

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Claims (2)

(57) [Claims] 1. A general formula OH- (CH _{2) n} -OH (wherein n is 16 to 20 also is a numerical value)
Or a mixture of the long-chain aliphatic diols shown in 1) with at least one organic titanate compound selected from tetraalkyl titanates, tetraaryl titanates and polymers thereof, and / or suspended in a solvent. A lubricant composition comprising: 2. The lubricant composition according to claim 1, wherein the amount of the organic titanate compound added is in the range of 1 to 110 parts by weight based on 100 parts by weight of the long-chain aliphatic diol.