JPH0742474B2 - Manufacturing method of solid lubricant for sliding plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is mainly applied to a pantograph slide plate of an electric vehicle,
The present invention relates to a low wear solid lubricant for a sliding plate to be arranged.

[Conventional technology]

The conventional solid lubricant for pantograph sliding plates, which is added to and placed on the sliding plates for the purpose of reducing the wear of the pantograph sliding plates of electric vehicles, is registered in Japan National Railways Standard August 1, 1984 JRS15191
The -8A-11BR4S is currently in wide use. The above lubricant components are black smoke 13-33%, resin binder 8-35%
%, MoS ₂ 0.3 to 6%, natural wax or wax residue, which is added in an appropriate amount, melted and kneaded by heating, and then cooled to a solid.

The properties of the above lubricants are bending strength of 55 kg / cm ² or more and softening point of 90.
It is ℃ ~ 120 ℃.

[Problems to be Solved by the Invention]

The conventional solid lubricant for pantograph sliding plates has a black color because it uses graphite as the main component, and the solid lubricant wears and wears out following the current collecting sliding wear of the sliding plates made of sintered alloy while the electric vehicle is running. When sprayed, fine powder of black antifriction agent containing graphite is scattered, and the roof of the electric car, the car body, and the surface of the window glass that are neatly painted by the rain and the temperature rise of the sliding plate are contaminated. It has the drawback of becoming dirty.

Furthermore, since the conventional solid lubricant contains natural wax or petroleum wax and the softening point is too low at 90 to 120 ° C,
While the electric vehicle is running, the solid lubricant may be eluted and scattered from the contact portion with the sliding plate of the pantograph. Also, because the softening point is too low, the solid lubricant that was placed on the same sliding surface as the sliding surface of the sintered alloy sliding plate softens due to heating when the electric vehicle is running, and after that, the temperature of the sliding plate cools down. Then, due to the surface tension, the sliding surface of the solid lubricant portion solidifies in a concave arc shape, so the sliding plate and the solid lubricant do not become the same sliding surface, and therefore the next electric vehicle travels. In this case, the contact surface with the trolley wire is reduced, and it is difficult to achieve curing as an antiwear lubricant and noise suppression.

The present invention is a white solid lubricant which has improved the above-mentioned problems of the prior art, and has a remarkable effect as a lubricant for a sliding plate, and softens even when heated by running an electric vehicle. And a solid lubricant for a pantograph sliding plate that can reduce and suppress the sliding noise generated by the sliding plate and the overhead wire while exhibiting the effect as a wear-reducing lubricant at the time of current collecting sliding. To do.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention, after mixing and stirring, by weight ratio, 3 to 60% of tetrafluoroethylene resin powder, 8 to 50% of talc powder, and 30 to 65% of unsaturated polyester resin varnish at room temperature. , Curing agent cyclohexanone peroxide-based solution 1-
It is characterized by adding 3% and further kneading and stirring at room temperature to make it solid.

[Action]

Ethylene tetrafluoride resin, which is the main component of the lubricant used in the present invention, is white ultrafine particles having a particle size of 1.37 μm, the friction coefficient with the steel surface is 0.04, and the friction coefficient with the hard steel surface is almost the same. At about 300 ℃, neither friction nor mechanical properties change. In addition, tetrafluoroethylene resin powder has a friction coefficient of about 1/10 compared to the scale graphite (particle diameter of about 44 μm, friction coefficient of about 0.15) used in conventional solid lubricants for pantograph sliding plates. Is about 1/3, and if this is mixed and well kneaded to be evenly distributed, the required lubricating performance can be achieved with a fraction of the graphite content. Then, in a weight ratio, the above-mentioned tetrafluoroethylene resin powder 3
~ 60%, talc powder 8 ~ 50%, unsaturated polyester resin varnish 30 ~ 65% after kneading and stirring at room temperature, then add 1 to 3% curing agent cyclohexanone peroxide solution and mix and stir at room temperature. Saturated polyester resin and curing agent undergo a chemical reaction during addition and kneading, and heat is generated at 130 ° C after about 15 minutes,
It is possible to strongly bond the main agent, white ultrafine tetrafluoroethylene resin, and the talc in a uniformly dispersed state. When the content of the tetrafluoroethylene resin used in the present invention is less than 3%, the lubricating effect of the solid lubricant decreases, and when it exceeds 60%, it becomes expensive.

In addition, since talc powder does not deteriorate up to around 900 ° C, it is a component that improves the sliding temperature of the product of the present invention and increases the lubrication performance and prevents softening. If it is less than 8%, the softening preventing effect is insufficient and 50%. If it is above, lubricity is insufficient.

Also, unsaturated polyester resin-based varnish is used as a binder for tetrafluoroethylene resin powder and talc powder,
If it is less than%, the kneaded product is too hard, and if it is 65% or more, the kneaded product is too soft.

If the cyclohexanone peroxide type solution is 1% or less, the curing is slow, and if it is 3% or more, it is fast and the workability of the product is deteriorated.

〔Example〕

Example 1 By weight ratio, tetrafluoroethylene resin powder 3%, talc powder 45
%, Unsaturated polyester resin varnish 50% into a kneader, uniformly knead and stir at room temperature, then add 2% of a curing agent cyclohexanone peroxide system solution, sufficiently knead, take out and fill into a predetermined shape mold. To obtain a white solid lubricant of the present invention.

Example 2 By weight ratio, tetrafluoroethylene resin powder 10%, talc powder 38
%, Unsaturated polyester resin varnish 50% into a kneader, uniformly knead and stir at room temperature, then add 2% of a curing agent cyclohexanone peroxide system solution, sufficiently knead, take out and fill into a predetermined shape mold. To obtain a white solid lubricant of the present invention.

Example 3 By weight ratio, tetrafluoroethylene resin powder 15%, talc powder 33
%, Unsaturated polyester resin varnish 50% into a kneader, uniformly knead and stir at room temperature, then add 2% of a curing agent cyclohexanone peroxide system solution, sufficiently knead, take out and fill into a predetermined shape mold. To obtain a white solid lubricant of the present invention.

Example 4 By weight ratio, tetrafluoroethylene resin powder 20%, talc powder 28
%, Unsaturated polyester resin varnish 50% into a kneader, uniformly knead and stir at room temperature, and then add 2% of a curing agent cyclohexanone peroxide solution to thoroughly knead, take out, and fill into a predetermined shape mold. To obtain a white solid lubricant of the present invention.

Example 5 By weight ratio, tetrafluoroethylene resin powder 50% and talc powder 8
%, Unsaturated polyester resin varnish 50% into a kneader, uniformly knead and stir at room temperature, then add 2% of a curing agent cyclohexanone peroxide system solution, sufficiently knead, take out and fill into a predetermined shape mold. To obtain a white solid lubricant of the present invention.

The characteristics of the white solid lubricant obtained in each of the above-mentioned examples are shown in Table 1.

In addition, the white solid lubricant obtained from each of the above-mentioned Examples 1 to 5 was cut out into 10 × 25 × 90 mm from a sliding plate for a pantograph for Shinkansen currently used by JR, and 5 × 5 × 90 mm was cut on the sliding surface. A test piece in which a gutter was created and embedded in it, and now as a comparison example
A test piece obtained by cutting out and embedding a solid lubricant whose main component is graphite used in JR conventional lines is mounted separately on a rotary current collector / sliding tester, pushing force 5 kg, energizing current AC 100 Amp. Sliding at a dynamic speed of 60 km / H for 60 minutes, the specific wear rate of each test piece and the wear rate of the mating trolley wire at that time (thickness wear of trolley wire per 10,000 times of pantery mm) were measured. The results are shown in Table 2.

As is clear from Table 1 above, the white solid lubricant obtained according to the present invention has the characteristics required as a solid lubricant for pantograph sliding plates, and as is clear from Table 2, it is a conventional solid lubricant containing graphite. It is, of course, whiter than the solid lubricant, but since the binder having a low melting point is not used, the sliding surface of the filled solid lubricant of the present invention does not decrease even if the temperature of the sliding plate cools down after traveling of the electric vehicle. It was proved that the specific wear rate of the sliding plate and the wear rate of the trolley wire were much smaller than that of the graphite-containing lubricant, and the other party's overhead wire was not damaged because it did not dent in a concave arc shape.

Further, as is clear from Tables 1 and 2, even if a part of 3 to 60% of tetrafluoroethylene resin powder and 8 to 50% of talc powder is replaced with a small amount of metallic lead or metallic sulfide, the present invention The performance as a lubricant of the is almost unchanged.

〔The invention's effect〕

As described above, according to the present invention, while having a remarkable effect as a lubricant for a pantograph sliding plate of an electric vehicle,
The damage and wear of the other party's overhead wire can be significantly reduced, and the tetrafluoroethylene resin is white and is an ultrafine powder with a particle size about 1/10 that of graphite, and the friction coefficient is 3 minutes. Since it is less than 1 of the above, a fraction of the graphite content is sufficient, and since the sliding surface of the solid lubricant always keeps the same sliding surface as the sliding plate, the lubricating effect can be improved and the noise can be reduced. There is an effect that can be done.

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Claims (1)

[Claims] 1. A weight ratio of 3 to 4 ethylene tetrafluoride resin powder.
After mixing 60%, talc powder 8-50% and unsaturated polyester resin varnish 30-65% at room temperature, add 1-3% curing agent cyclohexanone peroxide solution and knead and stir at room temperature to solidify. A method for producing a solid lubricant for a sliding plate, comprising: