JPH09235583A - Lubricating film and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lubricating film low in a frictional coefficient, long in an useful life before the increase in the frictional coefficient and excellent in a lubricating performance and a durable performance. SOLUTION: This lubricating film is obtained by coating a latex-like coating material containing a flaky MoS2 solid lubricant and a resin binder on a substrate, drying and blushing the applied coating material to arrange the flaky MoS2 solid lubricant in a direction, and subsequently curing the coating material with >=60J/cm<2> UV light. Thus, the lubricating film in which the resin binder is sufficient cured is formed on the substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the lubrication performance of mechanical structural members such as sliding members such as sliding bearings and meshing members such as gears, reduces the friction coefficient, and improves the durability of mechanical structural members. The present invention relates to a lubricating film suitable for greatly increasing the life and a manufacturing method thereof.

[0002]

In order to improve the lubrication performance of mechanical structural members, oils and greases such as oil and grease are applied to mechanical structural members, and solids such as MoS ₂ , WS ₂ and graphite. In many cases, a lubricating film made of a lubricant is formed on the sliding surface of the mechanical structural member.

For example, MoS ₂ is used as a solid lubricant, and a polyamide-imide resin is used as a resin binder (appropriate firing / curing conditions are: temperature: 220 ° C., time: 120
After applying a latex-like coating material containing about 10 minutes) to a base material and then drying and baking in an oven, the temperature is about 220 ° C. which is the optimum baking temperature of the polyamide-imide resin.
If firing is performed for about 0 minutes, MoS ₂ is oxidized, resulting in an increase in the coefficient of friction and a decrease in the sliding life, which causes deterioration in performance as a solid lubricant. Low temperature and short time (Temperature: 160〜
The firing was performed at 180 ° C. and time: about 60 minutes.

Therefore, since the curing of the resin is insufficient, the durability of the lubricating film becomes inferior. Therefore, the development of a lubricating film having a long service life and an excellent durability until the friction coefficient increases. There was a problem that was desired.

Therefore, an object of the present invention is to provide a lubricating film having a long service life until the friction coefficient increases and excellent in durability, and a manufacturing method thereof.

[0006]

As described in claim 1, a lubricating film according to the present invention comprises a solid lubricant and a resin binder, and is hardened by ultraviolet irradiation. I am trying.

In an embodiment of the lubricating film according to the present invention, as described in claim 2, the main component of the solid lubricant may be MoS ₂ .
Moreover, as described in claim 3, the film thickness is 3 to 25.
μm.

In the method for manufacturing a lubricating film according to the present invention, as described in claim 4, after coating a base material with a coating material containing a solid lubricant and a resin binder, it is irradiated with ultraviolet rays and baked. It is characterized by having done.

In the embodiment of the method for manufacturing a lubricating film according to the present invention, as described in claim 5, the content of the resin binder can be 50 to 95% by volume. .

Similarly, in the embodiment of the method for producing a lubricating film according to the present invention, as described in claim 6, the main component of the solid lubricant can be MoS _2. In this case, as described in claim 7, the solid lubricant is scaly MoS _2, which can be applied, dried and then brushed.

Similarly, in the embodiment of the method for manufacturing a lubricating film according to the present invention, as described in claim 8, the base material can be preheated before the coating of the coating material. In this case, the preheating temperature is more preferably about 50 to 60 ° C., and as described in claim 9, it is more preferable that the ultraviolet irradiation amount is 60 J / cm ² or more. .

[0012]

1 shows an embodiment of a lubricating film and a method for producing the same according to the present invention. After degreasing the surface of a base material such as a slide bearing or a gear with trichlene vapor or the like, Sandblasting is performed by blasting with alumina powder or the like, and then compressed air or the like is ejected to remove sand.

Next, the base material is preheated to, for example, 50 to 60 ° C., and then a paint containing a solid lubricant, a resin binder, a solvent (water, alcohol, etc.) and, if necessary, an appropriate auxiliary component is brushed or sprayed. Apply to the surface of the substrate with a gun.

In this case, the amount of the resin binder in the paint is preferably 50 to 95% by volume. When the amount of the resin binder is small, the amount of the solid lubricant is large, so that the lubricating film after baking and curing can be formed. When the amount of resin binder increases, the impact value improves, but the amount of solid lubricant decreases relatively, the friction coefficient increases, and the lubrication performance increases. And the service life tends to be shortened.

After the coating material is applied to the surface of the substrate, it is dried (for example, 80 ° C. for 30 minutes) and brushed with a brush to give a scale-like shape (for example, 10 μmφ × 1).
MoS ₂ having a scale of μmt or less) is arranged in the C-axis direction (direction along the surface of the base material).

Then, the film thickness is measured, and when the film thickness is excessive, the coating film is removed by, for example, ultrasonic cleaning in a solvent, preheating is performed, and then coating is performed again.

On the other hand, when the film thickness is insufficient, the surface is washed with isopropyl alcohol or the like, reapplied, and then dried.

Then, when the film thickness is appropriate, ultraviolet rays are radiated for firing. In this case, if the amount of UV irradiation is small, baking and curing of the resin binder will be insufficient and the service life will be shortened.
More desirably, the UV irradiation dose is 60 J / cm ² or more so that the curing is sufficient.

[0019]

According to the lubricating film of the present invention, as described in claim 1, the lubricating film contains a solid lubricant and a resin binder, and is cured by irradiation with ultraviolet rays. Therefore, the resin binder is fully baked.
When cured, it provides a lubricating film with a long service life.

And, as described in claim 2,
By using MoS _{2 as} the main component of the solid lubricant, a lubricating film having a low friction coefficient can be obtained. In addition to this MoS ₂ , WS ₂ , graphite and other solid lubricants can be applied. .

Further, as described in claim 3, by setting the film thickness to 3 to 25 μm, good lubricating performance can be obtained, and the film thickness is 3
When the thickness is less than μm, it tends to be difficult to obtain good lubricating performance, and when the thickness is greater than 25 μm, there is a tendency that problems such as peeling may occur.

Further, in the method for producing a lubricating film according to the present invention, as described in claim 4, after coating a base material with a coating material containing a solid lubricant and a resin binder, it is irradiated with ultraviolet rays and baked. As a result, the resin binder is sufficiently baked and cured, and a lubricating film having a long service life is manufactured.

Then, as described in claim 5,
By setting the content of the resin binder to 50 to 95% by volume, a lubricating film having a low friction coefficient and a good impact value can be obtained, and when the content of the resin binder is low, the solid lubricant is relatively increased and the friction value is increased. Although the coefficient is low, the impact value of the lubricating film tends to decrease, and when the amount of the resin binder is large, the flexibility is improved and the impact value increases, but the solid lubricant decreases and the friction coefficient tends to increase. Become. Therefore, the resin binder is set to about 50 to 70% by volume for applications such as space environment where the impact is relatively small,
It is also desirable in some cases to use a resin binder of about 70 to 95% by volume in applications such as automobiles where the impact is relatively large.

Further, as described in claim 6, the main component of the solid lubricant is MoS ₂ , whereby a lubricating film having a small friction coefficient and good lubricity can be produced. Therefore, as described in claim 7, the solid lubricant is scale-like MoS ₂ , and the scale-like MoS ₂ is formed by brushing after coating and drying. Along with the surface direction of the base material), a lubricating film having a small friction coefficient and excellent lubricating performance is manufactured.

Further, as described in claim 8,
By preheating the base material before coating the coating, the coating will dry faster and the coating will not crack easily, providing excellent lubricating performance and a long service life. A lubricating film will be manufactured.

Further, as described in claim 9, by setting the ultraviolet irradiation amount to 60 J / cm ² or more, for example, the number of sliding times until the friction coefficient exceeds 0.3 is further increased. Therefore, the service life of the lubricating film is further improved.

The curing of the resin binder is accomplished by irradiation with ultraviolet rays. However, the incorporation of an ultraviolet curing agent in the coating improves the absorption rate of ultraviolet rays, so that the curing of the coating is further accelerated. Become.

[0028]

[Examples] A disc (diameter: 48 mm, thickness: 8 mm) made of SUS440, which is martensitic stainless steel, was used as a base material, degreased with trichlene vapor, and then sandblasted with # 220 alumina powder. After that, compressed air was blown to remove sand.

Next, the disc was preheated to about 55 ° C., and then the coating material was spray-applied. The paint used here was a latex-like mixture in which 55% by volume of polyamideimide resin as a resin binder was mixed with MoS ₂ mineral powder in the form of scale (about 10 μmφ × 1 μmt or less) and dispersed in a solvent (water). It was supposed to be

Then, after heating at 80 ° C. and drying for 30 minutes, brushing is performed to arrange scale-like MoS ₂ in one direction (C-axis direction), and then the film thickness is measured. It was about 10 μm.

Subsequently, the coating film was baked by irradiating it with ultraviolet rays using an ultraviolet ray irradiation device having the intensity distribution shown in Table 1.

[0032]

[Table 1]

Next, using the disk thus formed with the lubricating film as a test piece, the elapsed time of sliding until the change of the initial sliding characteristics and the breaking of the lubricating film was measured by using a vacuum pin / disk tester. When examined, the results are shown in FIGS. 2 and 3, respectively.

In this vacuum pin / disk test, as shown in FIG. 4, an untreated SUS440 ball was used as the pin P pressed against the disk D, the load was 1 kg, and the sliding speed was 0.5 m / s. Constant (here, r =
The rotation speed was 298 rpm at 16 mm).

As a result, as shown in FIG. 2, it was confirmed that the initial friction coefficient was considerably smaller when the ultraviolet irradiation was performed according to the present invention than when the ultraviolet irradiation was not performed.

Further, as shown in FIG. 3, in the case of ultraviolet irradiation, the lubricating film ruptures in a short time and the friction coefficient sharply rises. It was confirmed that a considerably long sliding elapsed time was maintained until the fracture.

Next, a disk on which a calcined lubricating film according to the embodiment of the present invention (ultraviolet irradiation amount: 100 J / cm ² ) was formed, and a calcined lubricating film according to the prior art (heated in the atmosphere at oven, temperature: 190 ° C., time: Vacuum pin / disk test is performed using the disk with 50 minutes) formed as a sample,
When the number of times of sliding until the friction coefficient exceeds 0.3 was examined, the result was as shown in FIG.

As shown in FIG. 5, the number of slides was less than 10 ^{6 in} the case of the conventional technique, whereas the number of slides was more than 10 ^{7 in the} example of the present invention. It was observed to show a service life.

Further, when the effect on the service life of the lubricating film when the baking was carried out while changing the irradiation amount of ultraviolet rays was examined, the results shown in FIG. 6 were obtained.

As shown in FIG. 6, it has been confirmed that by increasing the irradiation amount of ultraviolet rays, the number of sliding times until the friction coefficient exceeds 0.3 can be increased and the service life can be increased. It was found that it is more desirable that the UV irradiation dose be 60 J / cm ² or more.

[0041]

According to the lubricating film of the present invention, as described in claim 1, the lubricating film contains a solid lubricant and a resin binder and is hardened by irradiation with ultraviolet rays. The resin binder can be sufficiently baked and cured, and a remarkably excellent effect that a lubricating film having a long service life can be provided is brought about.

And, as described in claim 2,
The fact that MoS ₂ is the main component of the solid lubricant brings about a remarkably excellent effect that a lubricating film having a low coefficient of friction can be obtained.

Further, as described in claim 3, by setting the film thickness to 3 to 25 μm, it is possible to obtain a lubricating film having good lubricating performance, which is remarkably excellent. The effect is brought.

Further, in the method for producing a lubricating film according to the present invention, as described in claim 4, after coating a base material with a coating material containing a solid lubricant and a resin binder, it is irradiated with ultraviolet rays and baked. By doing so, it is possible to make the resin binder sufficiently baked and cured, which brings about a remarkably excellent effect that it is possible to manufacture a lubricating film having a long service life.

Then, as described in claim 5,
By setting the content of the resin binder to 50 to 95% by volume, it is possible to obtain a remarkably excellent effect that the coefficient of friction is low and the impact value can be good.

Further, as described in claim 6, by using MoS _{2 as} the main component of the solid lubricant, it is possible to produce a lubricating film having a small friction coefficient and good lubricity. The solid lubricant is MoS ₂ in the form of flakes, and the solid lubricant is applied and dried, followed by brushing, as described in claim 7. Scale-like MoS
_{No. 2} is along the C-axis direction (the surface direction of the base material), which brings about a remarkably excellent effect that it is possible to manufacture a lubricating film having a small friction coefficient and excellent lubricating performance.

Further, as described in claim 8,
By preheating the base material before applying the paint, it is possible to speed up the drying after the application, and it is possible to prevent the coating film from cracking. In addition, it is possible to produce a lubricating film having excellent lubricating performance and a long service life, which is a remarkably excellent effect.

Further, as described in claim 9, by setting the ultraviolet irradiation amount to 60 J / cm ² or more, for example, the number of sliding times until the friction coefficient exceeds 0.3 is further increased. Therefore, it is possible to obtain a remarkably excellent effect that the service life of the lubricating film can be further improved.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram showing an embodiment of a method for manufacturing a lubricating film according to the present invention.

FIG. 2 is a graph exemplifying a result of examining a change in initial sliding characteristics of a test material disk using a vacuum pin / disk tester.

FIG. 3 is a graph exemplifying the result of examining the sliding elapsed time until the breakage of the lubricating film in the sample disk using a vacuum pin / disk tester.

FIG. 4 is an explanatory diagram showing an outline of a vacuum pin / disk test together with a relationship between a friction coefficient and a cumulative number of times of sliding.

FIG. 5 is a graph exemplifying the results of testing the number of sliding times until the friction coefficient exceeds 0.3 for a disk having a fired lubricating film according to the present invention and a disk having a fired lubricating film according to the prior art. .

FIG. 6 is a graph exemplifying the result of examining the influence of the ultraviolet irradiation amount on the service life of the lubricating film.

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Claims (9)

[Claims] 1. A lubricating film comprising a solid lubricant and a resin binder, which is cured by irradiation with ultraviolet rays. 2. The lubricating film according to claim 1, wherein the main component of the solid lubricant is MoS ₂ . 3. The lubricating film according to claim 1, which has a film thickness of 3 to 25 μm. 4. A method for producing a lubricating film, which comprises applying a coating material containing a solid lubricant and a resin binder to a base material, and then irradiating it with ultraviolet rays and baking the same. 5. The method for producing a lubricating film according to claim 4, wherein the content of the resin binder is 50 to 95% by volume. 6. The method for producing a lubricating film according to claim 4, wherein the main component of the solid lubricant is MoS ₂ . 7. The solid lubricant is scale-like MoS ₂ ,
The method for producing a lubricating film according to claim 4, wherein brushing is performed after coating and drying. 8. The method for producing a lubricating film according to claim 4, wherein the base material is preheated before the coating material is applied. 9. The method for manufacturing a lubricating film according to claim 4, wherein the irradiation amount of ultraviolet rays is 60 J / cm ² or more.