Composition for lubricating film formation and lubricating film

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a resin composition for forming a lubricating film and a lubricating film, and particularly a base material such as rubber or plastic such as a wiper blade, a seal packing, an O-ring, a weather strip, a glass run, a timing belt, a rubber bellows, a gear, and a door catch. The present invention relates to a resin composition for forming a lubricating film for forming a lubricating film having a small friction coefficient and excellent sliding durability on the surface of the above, and a lubricating film formed by the resin composition for forming a lubricating film.

【0002】

The present invention relates to a resin composition for forming a lubricating film, which is particularly effective for forming a lubricating surface film of a sliding member whose surface slides with other members, such as a wiper blade, a glass run, a weather strip, and an O-ring. The present invention relates to a lubricating film formed by a resin composition for forming a lubricating film.

【0003】

[Conventional technology]

Conventionally, molded products such as natural rubber and synthetic rubber have been used for the wiper blade rubber, but in such a wiper rubber, between the wiper plaid rubber and the glass surface during semi-drying or cold weather. The so-called "locking phenomenon" in which the operation of the wiper is stopped due to the adhesion phenomenon and the self-excited vibration due to the speed dependence of the friction coefficient showing negative characteristics, the so-called "chattering phenomenon" occurs, and the wiping failure and the blade rubber surface There were problems such as abnormal wear of rubber, shortening of the life of each part connected to the wiper system, increased power consumption of the operating motor, and annoyance and ears due to the "chatter phenomenon".

【0004】

On the other hand, regarding the slidability between rubber and metal, in the case of oil seals and gasoline cap seals, a sticking phenomenon occurs between the rubber and the metal surface, resulting in high torque when opening and closing; O-rings, packing, timing. Abnormal wear, stick slip, and squeal may occur due to the high sliding resistance between the rubber and the metal surface for belts, etc .; holes may also occur due to abnormal wear for rubber bellows; gears such as polyacetal and nylon resin. , Door catches, etc. have problems such as abnormal wear, squealing, and squeaking.

【0005】

As a surface coating member that solves such problems, has extremely good slidability, and has high coating durability, Japanese Patent No. 2903709 describes a coating layer containing a solid lubricant and a resin matrix. Is a surface coating member formed on the surface thereof, which is a thermosetting resin cured by the curing agent, and the thermosetting resin is a fluoroolefin vinyl ether vinyl ester copolymer resin. Is provided.

【0006】

With this surface covering member, good sliding characteristics can be obtained, but it is desired to further improve the sliding characteristics by further reducing the friction coefficient and improving the durability.

【0007】

[Problems to be Solved by the Invention]

According to the present invention, a resin composition for forming a lubricating film capable of forming a high-characteristic lubricating film having an extremely small friction coefficient and excellent sliding durability, and a lubricating film formed by the resin composition for forming the lubricating film. The purpose is to provide.

【0008】

[Means for solving problems]

The resin composition for forming a lubricating film of the present invention is a resin composition for forming a lubricating film containing a thermosetting binder resin, a solid lubricant and microcapsules, and the microcapsules are liquid-lubricated in the resin film. The binder resin contains an agent, and the binder resin is characterized by containing a fluoroolefin vinyl ether polymer resin and / or a fluoroolefin vinyl ether vinyl ester copolymer resin as a main component.

【0009】

By blending a solid lubricant and microcapsules in a thermosetting binder resin made of a fluoroolefin vinyl ether polymer resin and / or a fluoroolefin vinyl ether vinyl ester copolymer resin, the effect of improving lubricity by the solid lubricant And, by the synergistic effect of the lubricity improving effect by the microcapsules, the friction coefficient can be remarkably reduced and the sliding durability can be remarkably improved.

【0010】

That is, a surface coating member of Japanese Patent No. 2903709 containing a solid lubricant can obtain good sliding characteristics, but the lubricity of the solid lubricant alone tends to cause a insufficient friction coefficient. In the present invention, the friction coefficient, which is insufficient with the solid lubricant, can be supplemented with the liquid lubricant, and remarkably good sliding characteristics can be obtained by the synergistic effect of the lubricity of the liquid lubricant and the solid lubricant.

【0011】

The action and effect of the liquid lubricant in the present invention are as follows.

【0012】

That is, when the lubricating film formed by the resin composition for forming a lubricating film of the present invention is used as a sliding surface and the surface is slid, the microcapsules exposed on the lubricating film rupture due to friction with the mating material. However, the liquid lubricant flows out and covers the sliding surface to provide good lubricity.

【0013】

Since this liquid lubricant is liquid, it has a smaller coefficient of friction and aggression against opponents than a solid lubricant, and there is no risk of sludge or the like being generated.

【0014】

Then, as the wear of the sliding surface progresses, new microcapsules appear, so that a steady liquid lubricant can be supplied to the sliding surface, and the resin composition for forming a lubricating film of the present invention can be supplied. The sliding surface formed by the lubricating film can maintain excellent frictional properties stably for a long period of time.

【0015】

As described above, in the present invention, remarkably good sliding characteristics can be obtained by the synergistic effect of lubricity between the liquid lubricant and the solid lubricant.

【0016】

Further, the fluoroolefin vinyl ether polymer resin and / or the fluoroolefin vinyl ether vinyl ester copolymer resin itself, which is the binder resin of the present invention, is also advantageous in that it is excellent in lubricity, durability, chemical resistance, weather resistance and the like. Moreover, since the binder resin is thermosetting, a lubricating film can be easily formed by applying it to the surface of a base material and thermosetting it.

【0017】

In the present invention, the content of the microcapsules is 10 to 100 parts by weight with respect to 100 parts by weight of the fluoroolefin vinyl ether polymer resin and / or the fluoroolefin vinyl ether vinyl ester copolymer resin of the binder resin, and the solid lubricant is contained. The amount is preferably 50 to 400 parts by weight with respect to the fluoroolefin vinyl ether polymer resin and / or the fluoroolefin vinyl ether vinyl ester copolymer resin.

【0018】

Further, as the microcapsules, the weight ratio of the resin film and the liquid lubricant is preferably resin film: liquid lubricant = 1.5: 1 to 0.3: 1, and this liquid lubricant has a viscosity of silicone oil, particularly. A silicone oil of 200 to 1 million cSt is preferable. The average particle size of the microcapsules is preferably 50 μm or less.

【0019】

The resin constituting the resin film of the microcapsule used in the present invention is a mixed resin of two or more kinds of amino resins, particularly two or more kinds of mixed resins selected from the group consisting of urea resin, melamine resin and benzoguanamine resin, especially urea. It is preferable that the weight ratio of the resin to the melamine resin is a mixed resin of urea resin: melamine resin = 3: 7 to 7: 3.

【0020】

On the other hand, as the solid lubricant, a fluorine compound is preferable.

【0021】

The lubricating film of the present invention is formed by applying such a resin composition for forming a lubricating film of the present invention to the surface of a base material and then heat-curing it, and has a low friction coefficient and sliding durability. Remarkably excellent.

【0022】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the resin composition for forming a lubricating film and the embodiment of the lubricating film of the present invention will be described in detail with reference to the drawings.

【0023】

FIG. 1 is a cut view showing an embodiment of the lubricating film 2 of the present invention formed on the surface of the base material 1 by the resin composition for forming a lubricating film of the present invention. As shown in the figure, according to the present invention, a lubricating film 2 in which the microcapsules 5 containing the liquid lubricant 4 in the resin film 3 and the solid lubricant 6 are dispersed in the binder resin 7 is formed on the surface of the base material 1. Therefore, remarkably excellent lubrication characteristics can be obtained due to the synergistic effect of the lubricity of the liquid lubricant 4 and the solid lubricant 6 of the microcapsule 5.

【0024】

The resin composition for forming a lubricating film of the present invention will be described below.

【0025】

First, the microcapsules used in the present invention will be described.

【0026】

The microcapsules used in the present invention contain a liquid lubricant in a resin film (hereinafter sometimes referred to as a "capsule film"), and are like bubbles containing the liquid lubricant in the binder resin. The shape and material of the microcapsules are not particularly limited as long as they exist in a state and can improve the lubricity of the sliding surface by breaking bubbles and covering the sliding surface with the liquid lubricant. .. The shape may be spherical or disk-shaped. Further, the capsule membrane may have holes, grooves, or the like in a part of the capsule membrane, and the liquid lubricant may not be completely sealed by the membrane.

【0027】

The resin constituting the capsule film of the microcapsules is not particularly limited, but it is desirable to use a mixed resin composed of two or more kinds of amino resins. That is, when the capsule membrane is formed of a single resin, grooves and holes are likely to be formed in the capsule membrane, and it is often difficult to seal and enclose the liquid lubricant in the membrane. According to the amino-based mixed resin, grooves and holes are less likely to be formed, so that the liquid lubricant can be hermetically sealed and encapsulated in the capsule membrane, and a capsule membrane having excellent liquidtightness can be formed. .. If the capsule film of the microcapsule is excellent in liquidtightness, the liquid lubricant does not leak from the microcapsule in the resin composition, and the microcapsule is ruptured by friction with the mating material. Since the agent can be released, the good frictional properties of the resin composition for forming a lubricating film of the present invention can be maintained for a long time, which is preferable.

【0028】

When the capsule film is formed of an amino-based mixed resin, it is desirable that the mixed resin be any two types of urea resin, melamine resin, and benzoguanamine resin, preferably a mixed resin of urea resin and melamine resin. These resins have thermosetting properties and are collectively called amino resins. Urea resin has heat resistance and high hardness. Melamine resin has excellent impact resistance, heat resistance, and flame resistance. In addition, the benzoguanamine resin has improved crack resistance of the melamine resin. According to the mixed resin of these resins, a capsule film having better characteristics can be easily formed. In this case, the compounding ratio (weight ratio) of the mixed resin is more preferably 3: 7 to 7: 3 for the urea resin: melamine resin. By setting the blending ratio within this range, it is possible to form a capsule membrane having more excellent airtightness than those outside this range.

【0029】

As the liquid lubricant contained in the microcapsules, those usually used as liquid lubricants such as oil and grease can be used, but in particular, silicone oil, especially the viscosity (25 ° C kinematic viscosity) is high. A silicone oil of 200 to 1 million cSt is preferable. The higher the viscosity of this silicone oil is, the more preferable it is in terms of lubricity, and the viscosity of the silicone oil is particularly preferably 10,000 to 1,000,000 cSt. That is, if the viscosity of the silicone oil is low, the molecular chains of the silicone oil are easily sheared due to sliding, and the lubricity is lowered. Therefore, the silicone oil preferably has a high viscosity of 10,000 cSt or more.

【0030】

Further, the silicone oil is particularly preferably one emulsified with a surfactant or a silicone oil emulsion produced by an emulsification polymerization method. In this case, the surfactant is an anionic, nonionic or cationic surfactant. Agents, preferably one or more nonionic or cationic surfactants, are used. The particle size of this silicone oil emulsion is preferably 100 nm to 10 μm.

【0031】

The weight ratio of the capsule membrane of the microcapsules to the liquid lubricant is preferably capsule membrane: liquid lubricant = 1.5: 1 to 0.3: 1. If the amount of the capsule film is larger and the amount of the liquid lubricant is smaller than this range, the amount of the liquid lubricant leached due to the rupture of the microcapsules is small, and sufficient lubricity cannot be obtained. On the contrary, if the amount of capsule film is smaller than this range and the amount of liquid lubricant is large, it may not be possible to maintain a good microcapsule shape.

【0032】

If the particle size of the microcapsules containing such a liquid lubricant such as silicone oil in the capsule film is too large, bubbles will burst with a slight impact, and if it is too small, the amount of liquid lubricant contained will decrease and the microcapsules will break. The average particle size of the microcapsules is preferably 50 μm or less, particularly 1 to 50 μm, and particularly preferably about 1 to 20 μm because foaming is difficult.

【0033】

On the other hand, as the solid lubricant, sulfides such as molybdenum disulfide and tungsten disulfide, fluorine compounds such as polytetrafluoroethylene (PTFE) and graphite fluoride, graphite, silicone powder and the like can be used. One of these solid lubricants may be used alone or two or more of them may be combined, but in the present invention, PTFE is preferably used because of its excellent lubrication durability.

【0034】

The solid lubricant such as PTFE preferably has an average particle size of 10 μm or less, particularly 5 μm or less, and particularly preferably 0.5 to 5.0 μm.

【0035】

The binder resin used in the present invention contains a fluoroolefin vinyl ether polymer resin and / or a fluoroolefin vinyl ether vinyl ester copolymer resin (hereinafter, may be referred to as a "main component resin") as a main component. , This main component resin is cured with a curing agent to form a film.

【0036】

As this curing agent, polyisocyanate, melamine resin and the like can be used, and the ratio of the curing agent used to the main component resin is usually preferably 10 to 50 parts by weight with respect to 100 parts by weight of the main component resin.

【0037】

In the present invention, the microcapsules are preferably 10 to 100 parts by weight with respect to 100 parts by weight of the main component resin of the binder resin. If the blending ratio of the microcapsules is less than this range, the effect of sufficiently improving the lubricity cannot be obtained by blending the microcapsules, and conversely, if the blending ratio is large, the proportion of the main component resin is relatively reduced and the film forming property is improved. It decreases, and the wear resistance and mechanical strength of the lubricating film decrease.

【0038】

The solid lubricant is preferably 50 to 400 parts by weight, particularly 60 to 160 parts by weight, based on 100 parts by weight of the main component resin of the binder resin. If the proportion of the solid lubricant is less than this range, the effect of sufficiently improving the lubricity cannot be obtained by blending the solid lubricant, and conversely, if the proportion is large, the proportion of the main component resin is relatively reduced and the film-forming property is formed. Is reduced, and the wear resistance and mechanical strength of the lubricating film are reduced.

【0039】

In order to ensure lubricity, abrasion resistance, and mechanical strength, it is preferable to add 60 to 260 parts by weight of the microcapsules and the solid lubricant in total with respect to 100 parts by weight of the main component resin in the above range.

【0040】

The resin composition for forming a lubricating film of the present invention may contain various additives such as a colorant, a pigment, an ultraviolet absorber, and a flame retardant as long as the object of the present invention is not impaired.

【0041】

In order to form a lubricating film on the surface of the base material by the resin composition for forming a lubricating film of the present invention, a coating liquid is prepared by dispersing or dissolving microcapsules, a solid lubricant, a main component resin and a curing agent in an organic solvent. Then, this may be applied to the surface of the base material and then heated to cure.

【0042】

As the organic solvent, methyl ethyl ketone, toluene, xylene, isopropyl alcohol, isobutanol, n-butanol, butyl acetate, methyl isobutyl ketone (MIBK), propylene glycol monomethyl ether acetate and the like are suitable, and the amount of the organic solvent used is suitable for coating. The concentration may be appropriate, and there is no particular limitation.

【0043】

As the coating method, various methods such as brush coating, spraying, and dipping can be adopted. Prior to this coating, the surface of the base material may be cleaned or a surface treatment may be applied to improve the compatibility with the binder resin. Examples of such a surface treatment include a primer treatment and the like.

【0044】

Heating can be performed using a heating device such as an electric furnace, and the heating temperature is usually 60 to 150 ° C.

【0045】

The film thickness of the lubricating film thus formed varies depending on the use of the member forming the lubricating film, but is generally 5 to 50 μm, particularly about 5 to 20 μm. If this film thickness is less than 5 μm, a sufficient effect due to the formation of the lubricating film cannot be obtained, and if it exceeds 50 μm, a problem of film peeling may occur. Further, if the thickness of the lubricating film is excessively thick with respect to the particle size of the microcapsules, the microcapsules are buried in the film, and the lubricating effect due to the release of the liquid lubricant inside cannot be obtained. On the contrary, if it is excessively thin, the coating cannot hold the microcapsules, and when it comes into contact with the mating material, it breaks and falls off at an early stage, and the lubricity cannot be maintained for a long period of time. The film thickness of the microcapsules is preferably about 0.5 to 1.5 times the average particle size of the microcapsules.

【0046】

Such a lubricating film is particularly effective as a lubricating film for a sliding member made of rubber or plastic and a blended product, and in this case, the rubber or plastic constituting the base material of the sliding member is not particularly limited. Various types of rubber and plastic can be used.

【0047】

The rubber may be either natural rubber or synthetic rubber. Styrene butadiene rubber, butadiene rubber, isoprene rubber, ethylene propylene rubber (EPM, EPDM), acrylonitrile butadiene rubber, chloroprene rubber, isobutylene isoprene rubber, alfin rubber, polyether rubber, polysulfide rubber, silicone rubber, acrylic Examples thereof include rubber, fluororubber, halogenated polyethylene rubber, urethane rubber, ethylene vinyl acetate rubber, high styrene rubber, acrylonitrile isoprene rubber, preferably EPDM.

【0048】

The plastic may be either a thermosetting resin or a thermoplastic resin. Plastics include ABS resin, ABS blend, acetal resin (homopolymer), acrylic resin, ACS resin, alkyd resin, amino resin, ASA resin, cellulose resin, chlorinated polyether, diallyl phthalate resin, epoxy resin, ethylene acetic acid. Vinyl copolymer, fluororesin, ionomer, methylpentene polymer, phenol resin, polyamide (nylon), polyallyl ether, polyallyl sulfone, polypten-1, polycarbonate, unsaturated polyester resin, polyethylene, polyethylene terephthalate (tetron), polyimide , Polyphenolimide, polyphenylene oxide, polyphenylene sulfide, polypropylene, polystyrene, polysulfone, polyether sulfone, polyurethane, vinyl chloride resin, polyallylate and the like.

【0049】

The lubricating coating according to the present invention covers the surfaces of sliding members such as wiper blades, seal packings, O-rings, weather strips, glass runs, timing belts, rubber bellows, gears, door catches, especially wiper blades, glass runs, weather strips, and O-rings. It is extremely effective as a lubricating film to be formed on the wiper plate, and due to its excellent lubricity, it is possible to effectively prevent the "locking phenomenon" and "chattering phenomenon" in the wiper plaid. Further, in the case of an O-ring or the like, the sliding resistance between the rubber and the metal surface can be reduced to effectively prevent abnormal wear, stick slip, noise and the like.

【0050】

[Example]

The present invention will be described in more detail with reference to Experimental Examples and Examples.

【0051】

In the following experimental examples and examples, the lubrication durability test was carried out by the following method.

[Lubrication Durability Test Method] By spraying the resin composition, it is applied to the surface of the rubber piece, and this composition is cured under the curing conditions (heating conditions) at 80 ° C for 30 minutes, and the rubber block (material). A lubricating film with a thickness of 10 μm was formed on the surface of (butylated bromine rubber). This rubber block was cut into a size of 10 mm x 6 mm x 2 mm and used as a test piece. A lubricating film is formed on the 10 mm x 6 mm surface of this test piece.

【0052】

This test piece was mounted on a FALEXS NO.1 testing machine (FALEX CORPORATION), and the durability of the lubricating film was examined.

【0053】

FIG. 2 is a schematic side view showing the state of this test. The test piece 11 is held by the test piece holder 12, and is pressed against the outer peripheral surface of the ring 13 having a diameter of 35 mm with a load of 89 N (20 Lbs). ing. The material of the outer peripheral surface of the ring 13 is SAE4620 steel (hardness: HRc58-63), and the surface roughness is 6 to 12 rms. The ring 13 was reciprocally rotated around its axis at a speed of 150 cpm in a rotation range of 90 ° as shown by an arrow. The test atmosphere was dry and normal temperature.

【0054】

The number of cycles until the friction coefficient μ at this time reached 0.4 was measured as the life cycle (durability). If there was a sudden change in the friction coefficient before the friction coefficient reached 0.4, the test was terminated at that point, and the number of cycles at that time was defined as the life cycle.

【0055】

The microcapsules and solid lubricant used in the examples are as follows.

[Microcapsules] Microcapsules A: Capsule membrane material = mixed resin of urea resin and melamine resin (urea resin: melamine resin = 1: 2 (weight ratio)) Liquid Lubricant Material = Silicone Oil Emulsion, Viscosity 100,000cSt Emulsion particle size 250-350nm Microcapsule particle size = 1 ~ 10μm Capsule Membrane: Liquid Lubricant Weight Ratio = 1: 2 Microcapsule B: It has the same structure as microcapsule A except that it contains a silicone oil emulsion with a viscosity of 1000 cSt as a liquid lubricant.

[Solid lubricant] MoS₂: Average particle size 1 μm PTFE: Average particle size 5 μm Graphite: Average particle size 5 μm [0056]

Experimental Example 1 (Comparison of lubrication durability with principal component resin) Microcapsules A were mixed with the main agent and the curing agent having the following formulations in the formulations shown in Table 1, a resin composition was prepared, the lubrication durability was tested, and the results are shown in Table 1. [Resin Composition I] Main agent Fluoroolefin Vinyl Ether Vinyl Ester Copolymer (Dainippon I) "Fluoronate K702" manufactured by Nki Chemical Industry Co., Ltd.): 6.00 parts by weight Organic solvent (toluene, butyl acetate): 70.37 parts by weight Hardener Isocyanate hardener (Dan Nippon Ink and Chemicals Co., Ltd. "Barnock DN9" 80 "): 1.05 parts by weight Organic solvent (methyl ethyl ketone (MEK, ethyl acetate)): 8.60 parts by weight [Resin Composition II] Main agent Polyurethane modified bisphenol A type epoxy resin ("R-1527" manufactured by Asahi Denka Kogyo Co., Ltd.): 7.40 parts by weight Diglycidyl SL of long-chain dibasic acid: 7.40 parts by weight Organic solvent (toluene): 70.55 parts by weight Hardener Polyamide amine (Fuji Kasei Kogyo Co., Ltd. "Toramide TXA-525-E" L "): 8.65 parts by weight Organic solvent (methyl ethyl ketone (MEK)): 16.35 parts by weight [0057]

[table 1]

<img file="JP2003073609A_D0001.tif" />【0058】

From Table 1, it can be seen that the effect of improving the lubrication durability can be obtained by blending the microcapsules, and the effect of improving the lubrication durability is particularly large when added to the fluoroolefin vinyl ether vinyl ester copolymer. In addition, the best effect can be obtained when the blending amount of microcapsules is 10 to 100 parts by weight, particularly about 30 parts by weight, with respect to 100 parts by weight of the main component resin, and if this amount is exceeded, the lubrication durability tends to decrease. It turns out that there is.

【0059】

Example 1 (Comparative example of lubrication durability by the amount of PTFE added) In Experimental Example 1, the amount of microcapsules added was 31 parts by weight with respect to 100 parts by weight of the main component resin, only PTFE was used as the solid lubricant, and the amount of solid lubricant added was variously changed as shown in Table 2. A resin composition was prepared in 1 and tested for lubrication durability, and the results are shown in Table 2.

【0060】

[Table 2]

<img file="JP2003073609A_D0002.tif" />【0061】

From Table 2, the effect of improving the lubrication durability is obtained when the amount of PTFE blended is in the range of 50 to 400 parts by weight with respect to 100 parts by weight of the main component resin, and the best effect is particularly obtained at about 125 parts by weight. I understand.

【0062】

Example 2 (Comparison of Lubrication Durability by Viscosity of Silicone Oil) In Experimental Example 1, 125 parts by weight of PTFE alone was used as the solid lubricant with respect to 100 parts by weight of the main component resin, 30 parts by weight of the microcapsules shown in Table 3 were used as microcapsules, and an organic dye (Orient Chemical Industry Co., Ltd.) The resin composition was prepared in the same manner except that 3 parts by weight of "Oil Black HBB") manufactured by) was added, and the lubrication durability was tested. The results are shown in Table 3.

【0063】

[Table 3]

<img file="JP2003073609A_D0003.tif" />【0064】

From Table 3, it can be seen that significantly higher lubrication durability can be obtained when microcapsules A having a high viscosity of silicone oil are used.

【0065】

Example 3 (Comparison of lubrication durability and friction coefficient: Examples of the present invention and Comparative Examples 1 to 3) In Example 2, a resin composition (Comparative Example 1) prepared in the same manner except that PTFE was not blended, and PTFE and MoS as solid lubricants without blending microcapsules A.₂The same applies except that the resin composition (Comparative Example 2) prepared in the same manner except that 167 parts by weight and 127 parts by weight were blended with respect to 100 parts by weight of the main component resin, and microcapsules A and PTFE were not blended. The resin composition prepared in (Comparative Example 3) was similarly tested for lubrication durability, and the results are shown in Table 4 together with the results when microcapsules A were used in Example 2.

【0066】

In addition, the transition of the friction coefficient was investigated for each resin composition, and the results are shown in Fig. 3.

【0067】

[Table 4]

<img file="JP2003073609A_D0004.tif" />【0068】

From these results, it can be seen that remarkably excellent lubrication durability can be obtained by blending microcapsules and solid lubricant (PTFE) in combination.

【0069】

[Effect of the invention]

As described in detail above, according to the present invention, the friction coefficient is small, the wear resistance is excellent, the opponent aggression is low, and the excellent friction characteristics can be stably maintained for a long period of time. Provides an excellent lubricating coating.

[Simple explanation of drawings]

[Figure 1]

It is sectional drawing which shows the embodiment of the lubricating film of this invention formed on the surface of the base material by the resin composition for forming a lubricating film of this invention.

[Figure 2]

It is a schematic side view which shows the test method of the lubrication durability in an Example and a comparative example.

[Fig. 3]

It is a graph which shows the transition of the friction coefficient in Example 3.

[Explanation of symbols]

1 base material 2 Lubricating film 3 Resin film 4 Liquid lubricant 5 microcapsules 6 Solid lubricant 7 Binder resin 11 test piece 12 holder 13 ring