JPH0472391A - Production of solid lubricant for sliding plate - Google Patents

Abstract

PURPOSE:To obtain the lubricant effective for reduction of friction of sliding plate of ran to graph of electric rolling stock, by blending a mixture of tetrafluorinated resin powder, talc and specific varnish with a solution of specific curing agent. CONSTITUTION:(A) 3-60wt.% tetrafluorinated resin powder having 1.3-7mu particle diameter is blended with (B) 8-50wt.% talc and (C) 30-65wt.% unsaturated polyester resin-based varnish while stirring at normal temperature, mixed with (D) 1-3wt.% cyclohexanone-based solution of curing agent and further kneaded while stirring at normal temperature and solidified to give the objective lubricant.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention mainly relates to the use of additives to pantograph sliding plates for electric cars.
This invention relates to a solid lubricant that reduces wear on sliding plates.

[Conventional technology]

Conventional solid lubricants for pantograph sliding plates that are added to and placed on the pantograph sliding plates of electric cars for the purpose of reducing wear and tear are registered in the Japanese National Railway Standards (August 1982) JR31.
, 51, 9l-8A-118R4s (7) are currently in wide use. The ingredients of the lubricant listed in "-" are graphite 13
~33%, resin binder 8-35%.

Mo5z 0.3 to 6%, natural wax or wax residue, and these are added in appropriate amounts, melted and kneaded by heating, and then cooled to become solid.

The characteristics of the above lubricant include bending strength of 55 kg/aK or more.
The softening point is 90°C to 120°C.

[Problem to be solved by the invention]

Conventional solid lubricants for pantograph sliding plates have a black color because they contain graphite as a main ingredient, and the solid lubricant wears out due to the wear of the sliding plates made of sintered metal etc. while the electric car is running. During this process, black lubricant powder containing graphite scatters and flows out due to rain and the rise in temperature of the sliding plates, resulting in the beautifully painted roofs and bodies of electric cars.

This has the disadvantage that the surface of the window glass gets dirty and the area around the vehicle gets dirty.

Furthermore, conventional solid lubricants contain natural wax or petroleum-based wax and have a softening point of 90 to 120°C, which is too low. There is a risk that the agent will elute and scatter. In addition, because the softening point is too low, the solid lubricant placed on the same sliding surface as the sliding surface of the sintered metal sliding plate softens due to heating when the electric car is running, which causes the temperature of the sliding plate to cool down after the work is finished. As the surface tension decreases, the sliding surface of the solid lubricant part solidifies in a concave arc shape, so the sliding plate and the solid lubricant do not have the same sliding surface, and as a result, the next electric car During running, the contact surface with the trolley wire is reduced, making it difficult to harden as a wear-reducing lubricant and as a noise suppressor.

The present invention is a white solid lubricant that improves the problems of the prior art as described above, and is also effective as a friction reducing agent for sliding plates, and does not soften even when heated by running an electric car. It is an object of the present invention to provide a solid lubricant for pantograph sliding plates that is effective as a wear-reducing lubricant during current collection sliding, and that can also reduce and suppress the sliding noise generated by the sliding plates and overhead wires. It is something to do.

[Means to solve the problem]

In order to achieve the above object, the present invention mixes and stirs 3 to 60% of tetrafluoride resin powder, 8 to 50% of talc powder, and 30 to 65% of unsaturated polyester resin varnish by weight at room temperature. Curing agent cyclohexanone peroxide solution 1-3
% and further kneaded and stirred at room temperature to make it solid.

[Effect]

Tetrafluoride resin, which is the main ingredient of the lubricant used in the present invention, is a white ultrafine powder with a particle size of 1.3 to 7 μm, and has a friction coefficient of 0.04 with a steel surface and a friction coefficient with a hard copper surface. Almost equivalent to this, the frictional properties and mechanical properties do not change up to about 300°C. In addition, tetrafluoride resin powder has a particle size that is approximately 1/10th that of scaly graphite (particle diameter approximately 44 μm, friction coefficient approximately 0.15) used in conventional solid lubricants for pantograph sliding plates, and has a low friction coefficient. Since the coefficient is about one-third, if this is mixed in and thoroughly kneaded to distribute it uniformly, the required lubricating performance can be achieved with a fraction of the weight of graphite contained. And the above-mentioned tetrafluoride resin powder 3 to 6 in weight ratio
0%, talcum powder 8-50%.

After kneading and stirring 30 to 65% of unsaturated polyester resin varnish at room temperature, adding 1 to 3% of a hardening agent cyclohexanone peroxide solution and further mixing and stirring at room temperature, the unsaturated polyester resin and hardening agent are mixed during addition and kneading. Approximately 15 minutes after the chemical reaction occurs, heat is generated to 130°C, allowing the main ingredient, white ultrafine powdered tetrafluoride resin, and talc to be strongly bonded in a uniformly dispersed state. If the tetrafluoride resin used in the present invention is less than 3%, the lubricating effect of the solid lubricant will decrease, and if it is more than 60%, it will become expensive.

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

Furthermore, when the unsaturated polyester resin varnish is kneaded as a binder for tetrafluoride resin powder and talc powder, if it is less than 30%, the kneaded product will be too hard, and if it is 65% or more, the kneaded product will be too soft.

Furthermore, if the cyclohexanone peroxide solution is less than 1%, the curing will be slow, and if it is more than 3%, the curing will be rapid, and the workability of the product will be poor.

〔Example〕

Example 1 Put 3% of tetrafluoride resin powder, 45% of talc powder, and 50% of unsaturated polyester resin varnish in a weight ratio into a kneading machine and uniformly knead and stir at room temperature, followed by curing agent cyclohexanone peroxide solution. 2% was added and thoroughly kneaded, taken out and filled into a mold of a predetermined shape to obtain a white solid lubricant of the present invention.

Example 2 Put 10% tetrafluoride resin powder, 38% talc powder, and 50% unsaturated polyester resin varnish in a kneading machine by weight,
After uniformly kneading and stirring at room temperature, 2% curing agent cyclohexanone peroxide solution was added and thoroughly kneaded, taken out and filled into a mold of a predetermined shape to obtain a white solid lubricant of the present invention.

Example 3 Put 15% of tetrafluoride resin powder, 33% of talcum powder, and 50% of unsaturated polyester resin varnish into a kneader by weight,
After uniformly kneading and stirring at room temperature, 2% curing agent cyclohexanone peroxide solution was added and thoroughly kneaded, taken out and filled into a mold of a predetermined shape to obtain a white solid lubricant of the present invention.

Example 4 Put 20% tetrafluoride resin powder, 28% talc powder, and 50% unsaturated polyester resin varnish in a kneading machine in terms of weight ratio,
After uniformly kneading and stirring at room temperature, 2% curing agent cyclohexanone peroxide solution was added and thoroughly kneaded, taken out and filled into a mold of a predetermined shape to obtain a white solid lubricant of the present invention.

Example 5 Put 50% tetrafluoride resin powder, 8% talc powder, and 50% unsaturated polyester resin varnish in a weight ratio into a kneader, mix and stir them uniformly at room temperature, and then prepare a curing agent cyclohexanone peroxide solution. 2% was added and thoroughly kneaded, taken out and filled into a mold of a predetermined shape to obtain a white solid lubricant of the present invention.

Table 1 shows the characteristics of the white solid lubricants obtained in each of the above Examples.

Table 1 In addition, the white solid lubricants obtained from each of Examples 1 to 5 were cut into 110 x 25 x 90 pieces from the Shinkansen pantograph sliding plate currently used by JR, and a 5 x 5 piece was placed on the sliding surface.
A test piece was made by making a side gutter of 90mm x 90 mm and embedded in it, and a test piece was cut out and embedded in the same manner as above from a graphite-based solid lubricant currently used on JR conventional lines as a comparative example. Installed on a current collector sliding tester, pushing up blade 5kg, current ΔC 1,00Amp, sliding speed 60km/H.
The specimen was slid for a minute, and the specific wear rate of each test piece and the wear rate of the mating trolley wire (thickness wear m of the trolley wire per 10,000 punctures) were measured. The results are shown in Table 2.

Table 2 As is clear from Table 1 above, the white solid lubricant obtained according to the present invention has the characteristics necessary as a solid lubricant for pantograph sliding plates, and as is clear from Table 2, the white solid lubricant has graphite as the main ingredient. Of course, the filled solid lubricant of the present invention is whiter than conventional solid lubricants, and because it does not use a low-melting-point binder, the filled solid lubricant of the present invention can be used even if the temperature of the tank plate cools down after running an electric car. Since the sliding surface is not depressed in a concave arc shape, it has been demonstrated that the one-side wear rate of the sliding plate and the wear rate of the trolley wire are much lower than with a graphite-containing lubricant, and the contact wire on the other side is not damaged.

Furthermore, as is clear from Tables 1 and 2, even if a small amount of metal lead or metal sulfide is used to replace 3 to 60% of the tetrafluoride resin powder and 8 to 50% of the talcum powder, the present invention can still be achieved. Its performance as a lubricant remains almost unchanged.

〔Effect of the invention〕

As described above, according to the present invention, it has a remarkable effect as a lubricant for pantograph sliding plates of electric cars, and
It is possible to significantly reduce damage and wear on the other party's overhead wires, and in addition, the polytetrafluoride resin is a white, ultra-fine powder with a particle size of about one-tenth that of graphite, and a coefficient of friction that is three times smaller than that of graphite. Since it is less than 1, only a fraction of the graphite content is sufficient, and since the sliding surface of the solid lubricant always maintains the same sliding surface as the sliding plate, it is possible to improve the lubrication effect and reduce noise. effective.

Claims (1)

[Claims] Weight ratio: 3-60% tetrafluoride resin powder, 8-5% talcum powder
0%, unsaturated polyester resin varnish 30 to 65% are mixed and stirred at room temperature, 1 to 3% of a cyclohexanone peroxide solution as a hardening agent is added, and the mixture is further kneaded and stirred at room temperature to form a solid. Manufacturing method of solid lubricant for sliding plates.