JPS6233274B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a solid lubricant and a method for producing the same. A first object of the present invention is to provide a solid lubricant that can be shaped and has excellent lubricity. A second object of the present invention is to provide a solid lubricant suitable for use by being embedded in holes or grooves drilled in sliding surfaces such as bearings. A third object of the present invention is to provide a solid lubricant that is difficult to dissolve in lubricating oils, greases, and the like. Another object of the present invention is to provide a solid lubricant that has excellent mechanical strength and dimensional stability. Other objects of the invention will be understood from the description provided in the text below. Conventionally, solid lubricants of this type have been developed, such as those shown in Japanese Patent Publication No. 43-9498 and Japanese Patent Publication No. 51-3859, and have achieved considerable success in their respective intended uses. However, in cases where bearings equipped with these solid lubricants are used while being lubricated, or when the ambient temperature is relatively high, solid lubricants are used because the wax component in the composition has low resistance to oil or grease. It has the disadvantage that it swells or dissolves, or softens or melts due to heat, resulting in a significant drop in lubricating performance. In addition, the amount and quality of the wax component are considered to be the cause, but when the composition is molded into pellets or tablets, the molding shrinkage is large, and the state of shrinkage is not uniform. There is a problem that it is difficult to embed solid lubricant pellets densely in a sagging hole, etc. In addition, the solid lubricant pellets do not have sufficient mechanical strength, so if a large load is applied from the mating shaft, they will flow in the buried hole. , it becomes impossible to maintain the same surface as the sliding surface, resulting in phenomena such as burying. In particular, if a gap or space exists between the buried solid lubricant and the prepared hole, this tendency is significant and the lubricating property cannot be sufficiently exhibited. Furthermore, there are also problems such as solid lubricant falling out from buried holes and grooves. The present invention has been made to solve these problems, and effectively achieves the above-mentioned objectives of the invention. The composition and manufacturing conditions of the lubricant of the present invention will be explained in detail below. Composition The atomized lead powder used in the present invention is
The powder is almost granular in shape and passes through a 200-mesh Japanese Industrial Standard sieve, particularly preferably a 250-mesh powder. Atomized lead powder has a large apparent density in the same particle size distribution and extremely low agglomeration, unlike stamped lead powder which has an irregular particle shape. For example, stamped lead powder that passes 90% or more of 250 meshes has an apparent density of 1.8 to 2.4 g/
cm ³ whereas atomized lead powder has 5.2-5.8 g/cm ³ in the same particle size distribution. According to experiments conducted by the present inventors, atomized lead powder has superior miscibility with other components of the present invention compared to the case of using stamped lead powder, and that a homogeneous dispersion can be obtained. It was later discovered that the powder has the following characteristics: excellent powder fluidity and extremely low tendency to oxidize during heating. These properties are extremely important as a solid lubricant component of the present invention, and the reason will become clear from the explanation below. The blending amount of atomized lead powder is 75 to 90% by weight.
However, if added in a large amount exceeding 90% by weight, the coefficient of friction will increase when applied under conditions where the load is not very large. Moreover, if it is less than 75% by weight, not only the ability to form a solid lubricating film on sliding surfaces is reduced, but also the mechanical strength when formed into a solid material such as pellets is reduced. The tetrafluoroethylene resin powder used in the present invention is a fine powder with a particle size of approximately several microns to several tens of microns, and has a surface area of 6.9 m ² /gr.
(by absorbtometer), true specific gravity 2.27, melting point 324℃
It is also preferable to use fluorine resin lubricant powder (TFE Lubricant), which has a low coefficient of friction (all representative values). This fluorine resin lubricating powder (hereinafter simply PTFE)
Unlike the tetrafluoroethylene resin powder (referred to as "raw" Teflon and distinguished from the above-mentioned PTFE), which is used as a molding material, Teflon has no cohesion between particles and cannot be molded by itself. It is a fine powder with a smooth texture. For example, the present inventors have obtained good results using a PTFE powder called "TLP-10F-1" from Mitsui Fluorochemical Company. The blending amount of the PTFE powder component is preferably 7 to 19% by weight. If it is blended in a large amount exceeding 19% by weight, the mechanical strength when formed into a solid material such as pellets will be impaired, and if it is less than 7% by weight, sufficient lubricating performance will not be exhibited. These lead powder and PTFE powder may be coated when or before mixing them. The purpose of coating is to uniformly mix both powders, which differ in specific gravity, powder particle size, interfacial tension, etc., and to improve the water resistance and oil resistance of the solid lubricant solid. The thickness of the coating film is effective on the order of millimicrons, and the blending weight may be 0.05 to 0.3% by weight based on the total weight of the solid lubricant. As a coating agent, one component of solid lubricant is
Since it is PTFE, the present inventors obtained extremely good results using a fluorine-based coating agent.
In other words, fluorine-based coating agents include various fluorine-based coating agents (surfactants, ) may be used selectively. Note that this type of fluorine-based coating agent usually has a fluoroalkyl group in its molecule, and includes perfluoroalkyl carboxylate, perfluoroalkyl phosphate, perfluoroalkyl trimethylammonium salt, and perfluoroalkyl. Betaine, perfluoroalkyl
Preferable examples include ethylene oxide adducts and the like. Particularly preferable examples include Sumitomo 3M's coating agent FX-900 or FC721.
For example, The former is a pale yellow liquid with a specific gravity of 1.32 and a boiling point of 72°C. When dried at room temperature, a colorless and transparent film with extremely low surface tension is obtained, imparting water and oil repellency. When treating a powder component with the former coating agent, for example, the coating agent is diluted with a volatile solvent such as trichloroethane, mixed with the powder component, and the solvent is removed by air drying or heat drying. , a powder with a coating film as described above is obtained. When using the latter FC-721 coating agent, use a fluorine-based solvent,
For example, Showa Denko's Fronsiyowa FS-3
Use. In addition, Asahi Glass Co., Ltd.'s fluoroalkyl surfactant "Surflon (S-111, -112, -121, -
131, -141, -145, etc.) can also be cited as preferred coating agents in the present invention. The waxes used in the present invention have the functions of lowering the coefficient of friction, imparting fluidity to the powder composition when it is shaped into a solid, and acting as a binder. The blending amount is 3-6
% by weight is preferable, and if it is added in a large amount exceeding 6% by weight, molding shrinkage increases, resulting in a decrease in dimensional stability and a decrease in mechanical strength. Such a decrease in performance inevitably leads to a decrease in lubrication performance. Moreover, if it is less than 3% by weight, it is difficult to expect an improvement in lubricity, and the fluidity decreases, resulting in difficulty in molding. In particular, injection molding, which is expected to be mass-producible, becomes impossible. In this invention, since atomized lead powder is used, a smaller amount of wax is required to impart fluidity to the mixed powder and provide a bonding effect compared to when stamp powder is used. Waxes that can be used in the present invention are wax-like substances such as hydrocarbon waxes with a melting point of approximately 50°C or higher, higher fatty acids, waxes obtained by inducing higher fatty acids, and oxidized waxes. Any one of them or a mixture of two or more thereof can be used. In other words, hydrocarbon waxes include paraffin waxes with carbon numbers of 24 or more, olefin waxes with carbon numbers of 26 or more, alkylbenzenes with carbon numbers of 28 or more, and crystalline waxes. High quality microcrystalline waxes may also be used effectively. Higher fatty acids include saturated fatty acids with a carbon number of 14 or more, such as myristic acid, palmitic acid, stearic acid, arachic acid, montanic acid, etc., and unsaturated fatty acids with a carbon number of 18 or more, such as octadecenoic acid.
acid), parinaric acid, etc. In addition, 2- with carbon number of 11 or more
Keto saturated fatty acids and the like may also be used. Waxes Obtained by Deriving Higher Fatty Acids Waxes belonging to this category include higher fatty acid esters, higher fatty acid amides, higher fatty acid salts, and the like. In other words, higher fatty acid esters include methyl and ethyl esters of higher fatty acids having approximately 22 or more carbon atoms, such as Behenic acid ethyl ester, Tricosanoic acid methyl ester,
and esters of higher fatty acids with carbon numbers of 16 or more and higher monohydric alcohols with carbon numbers of 15 or more, such as palmitic acid pentadecyl ester.
ester), stearic acid octadecyl ester, and mono- and higher fatty acids with approximately 12 or more carbon atoms.
Di-glycerin esters, such as 1-3 di-lauric acid glyceride (1-3 di-lauric acid glyceride)
glyceride), mono-stearic glyceride, and triglycerides of higher fatty acids with carbon numbers of 14 or more, such as 1-myrist, 2-palmitic, 3-stearic glyceride (1-
myristic 2-palmistic 3-stearic
glyceride), etc. In addition, esters of keto fatty acids, such as methyl 2-ketostearate (2-keto
stearic acid methyl ester) can also be used. Higher fatty acid amide As the higher fatty acid amide, palmitic acid amide, stearic acid amide, and oleic acid amide are particularly preferred. Higher fatty acid salts Examples of higher fatty acid salts include salts with alkali and alkaline earth metals, such as lithium stearate and calcium stearate. Oxidized wax and others Oxidized wax is a pale yellow waxy substance obtained by oxidizing paraffin wax, and has a specific gravity of 0.825-0.885, an acid value of 20-70, and a saponification value of 60-60.
180, has a hydroxyl value of 30 to 40 and an iodine value of 15 to 25, and is composed of oxygenated compounds such as higher fatty acids, higher alcohols, ketones, aldehydes, oxyacids, ketoacids, esters, lactones, and esteroids, and hydrocarbons. It is a complex mixture. As an oxidized wax containing such components and exhibiting such properties, for example, the NPS-#8000 series manufactured by Nippon Seiro Co., Ltd. is one that can be effectively used. In addition, waxy substances used as wax in the present invention include alkyl ketones,
Examples include higher alcohols, polyhydric alcohols, and polyhydric alcohol esters other than those mentioned above. For example, octyl ketone, octylphenyl ketone, oleic acid ester of sorbitan or mannitan can be used. The wax as a solid lubricant component can be appropriately selected within the above-mentioned range depending on the usage conditions of the bearing equipped with the solid lubricant. For example, when the load is relatively light and the wax is used at room temperature, or when it is used in water, it is preferable to use a hydrocarbon wax, a higher fatty acid, an oxidized wax, etc. alone or in combination. In cases where the operating temperature is relatively high, for example, higher fatty acid salts or mixtures thereof with other waxes may be recommended. Under conditions of use where mineral oils or greases are used, higher fatty acid amides or mixtures thereof with other waxes, which are relatively water and oil resistant, are particularly recommended. In addition, certain types of higher fatty acid esters, such as sorbitan monooleate, have excellent anti-corrosion effects in addition to their lubricating properties.
It may be an effective ingredient if such effects are particularly required. The present inventors have investigated the behavior of these waxes as solid lubricant components, that is, the behavior when the waxes are mixed with lead and PTFE powder, and the behavior of the wax when the composition obtained by mixing is shaped.
As a result of extensive research into the physical properties of solid lubricants shaped into pellets and the lubricating performance of these solid lubricants, we found that these waxes contain 0.1 to 0.8% by weight of fluorine-based surfactants based on the weight of the wax. It has been found that the role played by the wax component becomes even more effective when used with the addition of a wax component. In other words, it has been observed that the addition of a fluorine-based surfactant has the effect of increasing the dispersibility of waxes in lead and PTFE powder during the mixing process, and evenly wetting the powder particles. The fluidity of the product was improved, and microscopic observation of the cut surface of the resulting pellet solid lubricant revealed that it contributed to fine dispersion and homogenization of each component. In addition, this fluorine-based surfactant imparts water and oil resistance to waxes, and even when used under conditions where oil and greasing are carried out, the solid lubricant embedded in the bearing will not swell or swell. It has been found that the adverse effects of dissolution can be largely prevented. In addition, the water and oil resistance of solid lubricants has been significantly improved due to the use of higher fatty acid amides, which are relatively water and oil resistant as waxes. Even after immersion, there was almost no or very slight dimensional change due to elution of wax components or swelling of the solid lubricant pellets. As the fluorine-containing surfactant having such an effect, it is most preferable to use a fluorinated alkyl ester as an active ingredient. The fluorinated alkyl ester is a pale yellow or amber highly viscous liquid, and can be used after being diluted with an organic solvent if necessary. In the present invention, good results were obtained using Sumitomo 3M's FLUORAD FC-430 and FC-431. Florado FC-430 is made of 100% of the above active ingredients, and both have a viscosity of 15,000 centipoise at 25°C, a specific gravity of 1.1 to 1.2, and a refractive index of 1.445 to 1.449.
This shows that. Florard FC-431 is an acetate ester solution containing 50% of the above active ingredients, and both have a viscosity of 200 centipoise at 25°C, a specific gravity of 1.0 to 1.1, and a refractive index.
1.406. Manufacturing conditions (A) Atomized lead powder and PTFE powder are mixed in a predetermined ratio, and a predetermined amount of the above-mentioned wax is mixed with 0.1 to 0.8% by weight of a fluorine-based surfactant and uniformly melted. A solid lubricant composition in the form of powder is obtained by adding, stirring and mixing at a temperature higher than the melting point of the wax used, and cooling while continuing stirring. The type of mixing device is not particularly limited, but one equipped with a stirring blade and a heating/cooling device is preferable.The present inventors used a Henschel high-speed mixer for mixing and obtained good results. Granulation is possible depending on the conditions of the Henschel high speed mixer. The composition thus obtained is transferred as it is or, particularly preferably, after granulation, to a molding step. Granulation of the composition may be carried out using a device such as a tablet press, or by transferring the powdered composition using a screw and extruding it through a die with small holes under pressure. A device such as a pelletizer that produces pellets in the form of short strings or cylinders may also be used. Using a composition granulated in this way not only has the advantage of facilitating the molding operation in the next step, but also improves the homogeneity of the obtained solid solid lubricant and has a positive effect on its mechanical strength. It turned out to give. Manufacturing conditions (B) Add and mix a fluorine-based coating agent solution to a predetermined amount of atomized lead powder and PTFE powder, evaporate the solvent to form a thin film of the coating agent on the surface of each particle of these powders, and then proceed as described above. A predetermined amount of waxes or waxes obtained by adding a fluorine-based surfactant to the waxes and melting them uniformly was stirred at a temperature higher than the melting point of the waxes used, and as described in the manufacturing conditions (A) below. A solid lubricant was obtained using a method similar to that described above. The superior properties of the solid lubricant of the present invention, including oil resistance, are attributed to the synergistic effect of the combination of the selected components and the specific measures applied to each component as described above. be able to. Some examples will be described below. Example 1 85% by weight of atomized lead powder that passes 200 meshes on the Japanese Industrial Standards Sieve (JIS Z-8801),
PTFE powder (manufactured by Mitsui Fluorochemical Co., Ltd., TLP-
10F-1) 11% by weight, 125% as waxes
85% by weight of paraffin wax, 10% by weight of higher fatty acid amide (mixture of oleic acid amide and stearic acid amide), 4.4% by weight of cerotic acid myricyl alcohol ester, and 0.6% by weight for waxes.
4% by weight of a fluorine-based surfactant (FLUORAD FC-430, manufactured by Sumitomo 3M) was added and melted, and the mixture was uniformly stirred and mixed at a temperature of 90°C. While stirring, the temperature of the mixture was lowered to room temperature to obtain a powdery solid lubricant composition. This was molded using a plunger type injection molding machine under the conditions of molding temperature: 60℃ for the rear, 80℃ for the middle, and 90℃ for the front, molding pressure: 1000Kg/cm ² mold temperature: 30℃, and the diameter was 14mm. Cylindrical pellets with a height of 16 mm were obtained. Example 2 The powdery solid lubricant composition obtained in Example 1 was granulated into small cylinders with a diameter of about 2.5 mm using a twin-screw extrusion pelletizer while maintaining the temperature at 60 to 90°C. . Then, using a screw type injection molding machine, molding temperature: 70℃ for the rear, 75℃ for the middle, 80℃ for the front Molding pressure: 1300Kg/cm ² Mold temperature: 30℃ Screw rotation speed: 60 rotations/ The pellets were molded under the following conditions to obtain cylindrical pellets with a diameter of 14 mm and a height of 16 mm. Example 3 The powdery solid lubricant composition obtained in Example 1 was granulated into small cylinders with a diameter of about 2.5 mm using a twin-screw extrusion pelletizer while maintaining the temperature at 60 to 90°C. . Next, this is molded using a compression molding machine under the conditions of preheating temperature of the granules: 50 to 60°C, molding pressure: 300 kg/ ^cm2 , and mold temperature: 40°C to form cylindrical pellets with a diameter of 14 mm and a height of 16 mm. I got it. Example 4 85% by weight of atomized lead powder that passes 200 meshes on the Japanese Industrial Standards Sieve (JIS Z-8801)
PTFE powder (manufactured by Mitsui Fluorochemical Co., Ltd., TLP-
10F-1) 11% by weight, 94% by weight of higher fatty acid amide (mixture of stearic acid amide and palmitic acid amide) as waxes, 5.5% by weight of 1,3-dilauric acid glyceride, and 0.5% by weight of waxes. Fluorine surfactant (manufactured by Sumitomo 3M, FLUORAD FC)
Add 4% by weight of 430 and melt it.
The mixture was stirred and mixed uniformly at a temperature of 80 to 140°C. While stirring, the temperature of the mixture was lowered to room temperature to obtain a powdery solid lubricant composition. Then, the composition was granulated into small cylinders with a diameter of about 2.5 mm using a twin-screw extruder pelletizer while maintaining the temperature within the above temperature range. Next, this granulated material is molded using a screw-type injection molding machine at a molding temperature of 90℃ for the rear, 120℃ for the middle, and 140℃ for the front.
℃ Molding pressure: 1300 kg/cm ² Mold temperature: 35° C. Cylindrical pellets with a diameter of 14 mm and a height of 16 mm were obtained. Example 5 85% by weight of atomized lead powder that passes 200 meshes on a Japanese Industrial Standards sieve (JIS Z-8801),
PTFE powder (manufactured by Mitsui Fluorochemical Co., Ltd., TLP-
Add a solution of 0.1% by weight of a fluorine-based coating agent (FX-900, manufactured by Sumitomo 3M) diluted with trichloroethane to 10F) 11% by weight, stir and mix to sufficiently wet each powder, and then mix the mixture. 75～
The solvent was removed by drying at a temperature of 120°C. Separately 125〓paraffin wax 84.7% by weight,
Oxidized wax (manufactured by Nippon Seiwa Co., Ltd., oxidized paraffin)
NPS#8070) 5% by weight, higher fatty acid amide (mixture of stearic acid amide and palmitic acid amide)
10% by weight, and a fluorine-based surfactant (manufactured by Sumitomo 3M, FLUORAD FC)
430) Wax component melt-mixed with 0.3% by weight
3.9% by weight of the coated lead.
It was added to the PTFE mixed powder and stirred uniformly at a temperature of 90°C. Then, the temperature of the mixture was lowered to room temperature while stirring, to obtain a solid lubricant in the form of powder. This was molded using a plunger type injection molding machine under the conditions of molding temperature: 60℃ for the rear, 80℃ for the middle, and 90℃ for the front, molding pressure: 1000Kg/ ^cm2 , mold temperature: 30℃, and a diameter of 14mm high. Cylindrical pellets with a length of 16 mm were obtained. Example 6 The composition obtained in Example 5 was molded using a screw-type injection molding machine. Molding temperature: 70°C in the rear, 75°C in the middle, 80°C in the front. Molding pressure: 1300 kg/cm ² molds. Molding was carried out under the conditions of temperature: 30°C and screw rotation speed: 60 revolutions/minute to obtain cylindrical pellets with a diameter of 14 mm and a height of 16 mm. Example 7 The composition obtained in Example 5 was molded using a compression molding machine under the following conditions: Composition preheating temperature: 50 to 60°C Molding pressure: 300 kg/cm ² Mold temperature: 40°C , cylindrical pellets with a diameter of 14 mm and a height of 16 mm were obtained. Example 8 Coated lead obtained in Example 5
A wax component made by melt-mixing 96.1% by weight of PTFE mixed powder with 95% by weight of higher fatty acid amide (a mixture of stearic acid amide and palmitic acid amide), 4.7% by weight of oxidized wax, and 0.3% by weight of fluorine-based surfactant. Add 3.9% by weight, 120-140
The mixture was stirred and mixed uniformly at a temperature of .degree. Then, the temperature of the mixture was lowered to room temperature while stirring, to obtain a powdery solid lubricant composition. This composition was molded using a plunger type injection molding machine at a molding temperature of 100°C for the rear part, 120°C for the middle part, and 120°C for the front part.
Molding was carried out under the conditions of 140°C, molding pressure: 1300 Kg/cm, ^and mold temperature: 30°C to obtain cylindrical pellets with a diameter of 14 mm and a height of 16 mm. The results of experiments regarding the physical and mechanical properties, oil resistance, and lubricating performance of the pellet solid lubricant of the present invention thus obtained are shown in the table. The comparison product is a solid lubricant made by the Japanese Patent Publication No. 43-9498.

【table】

[Table] In the table, the oil resistance test is based on mineral oil equivalent to SAE30.
The results are shown for the results of time immersion. (Note 1) In the case of the present invention product (), the pellet according to Example 4, the present invention product (), the pellet according to Example 8, and (Note 2) the present invention product () ), the pellets according to Example 1 were used, and in the case of the product of the present invention (), the pellets according to Example 5 were used. The test results for Note 2 were determined to be ``slight swelling. The immersion oil becomes slightly cloudy.'' and ``very slight swelling. The immersion oil becomes slightly cloudy.'' However, they are not unsuitable for practical use. Further, the values of friction coefficients μ ₁ and μ ₂ are based on the following test conditions. (i) Test conditions for friction coefficient μ ₁ Load: 300 Kg/cm ² Thrust load Sliding speed: 1.02 m/min Test piece: Aluminum manganese bronze sliding surface with pellets of the example embedded at 27% of the sliding area. . Compatible material Chromium molybdenum steel type 22. Induction hardening. Rockwell hardness 50-51. Test time Measurement at 2000 cycles (ii) Test conditions for friction coefficient μ ₂ Load 300Kg/cm ^2- way oscillation Sliding speed 0.6m/min Test piece Aluminum manganese bronze oscillation surface with the pellets of the example on the oscillation area 27% embedded. Compatible material Type 2 general structural rolled steel with hard chrome plating. Test time: Measurement at 2000 cycles Note that solid lubricants containing lead often have high molding temperatures during the molding process to obtain solid materials such as pellets, or when residence time in the barrel of the molding machine is long. However, the use of atomized lead powder can almost completely avoid this problem. Lead oxide inherently has lubricating properties, and from this point of view there is no problem, but the production or mixing of lead oxide as a solid lubricant component of the present invention impairs the mechanical strength of the solid material. Therefore, it is necessary to actively eliminate it. When using stamped lead powder with the same composition as the present invention, it is extremely difficult to obtain a solid product without producing lead oxide, but atomized lead powder has excellent powder flowability and a small surface area.
And by the specified material configuration of the present invention,
It had excellent moldability and no oxidation was observed. In addition, as already mentioned, the solid lubricant of the present invention has small molding shrinkage due to the small wax component, but these characteristics are as follows. When burying the product in a hole, etc., a method is sometimes used to firmly fix it there using an adhesive, but in this case, the adhesive strength must be greater than that of conventional ones. This low molding shrinkage is extremely advantageous in the method of injecting solid lubricants under pressure directly into holes drilled in bearing sliding surfaces and solidifying them instead of manufacturing and using them. This brings about the effect of As explained above, the solid lubricant of the present invention has significantly improved performance compared to conventional lubricants. Since the solid lubricant of the present invention can raise the lower limit of mechanical strength, particularly compressive strength, it is particularly effective as a solid lubricant for embedding.

Claims (1)

[Scope of Claims] 1 Wax obtained by inducing 75 to 90% by weight of atomized lead powder, 7 to 19% by weight of tetrafluoroethylene resin powder, hydrocarbon wax, higher fatty acid, and higher fatty acid, and 3 to 6% by weight of waxes obtained by adding 0.1 to 0.8% by weight of a fluorine-based surfactant based on the weight of the wax to one or a mixture of two or more of oxidized waxes;
A solid lubricant consisting of 2. 75-90% by weight of atomized lead powder, 7-19% by weight of tetrafluoroethylene resin powder, 0.05-0.3% by weight of a fluorine-based coating agent capable of forming a film on the surface of each particle of these powders, and (a) Adding 0.1 to 0.8% by weight of wax to any one or a mixture of two or more of hydrocarbon waxes, higher fatty acids, waxes obtained by inducing higher fatty acids, and oxidized waxes. 3 to 6% by weight of waxes obtained by adding an elementary surfactant, or (b) any one or two of hydrocarbon waxes, higher fatty acids, waxes obtained by inducing higher fatty acids, and oxidized waxes. A solid lubricant comprising: 3 to 6% by weight of a wax consisting of a mixture of more than one species. 3 Hydrocarbon wax, higher fatty acid, wax obtained by inducing higher fatty acid into a mixed powder of 75 to 90% by weight of atomized lead powder and 7 to 19% by weight of tetrafluoroethylene resin powder, or oxidized wax Adding 0.1 to 0.8% by weight of a fluorine-based surfactant based on the weight of the wax to a mixture of one or more types, and stirring and mixing 3 to 6% by weight of the wax in a molten state, A method for producing a solid lubricant, which comprises then forming the mixture into a homogeneous and dense solid by molding means such as injection or compression. 4 75 to 90% by weight of atomized lead powder and 7 to 19% by weight of tetrafluoroethylene resin powder were mixed with a fluorine-based coating agent solution containing 0.05 to 0.3% by weight of solid content based on the entire solid lubricant. Afterwards, the solvent is blown off to form a thin film of the coating agent on the surface of each particle of these powders, and the thus obtained mixed powder is treated with (a) hydrocarbon wax, higher fatty acids, and higher fatty acids. Waxes obtained by adding 0.1 to 0.8% by weight of a fluorine-based surfactant based on the wax weight to 3 to 6% by weight of a fluorine-based surfactant to any one or a mixture of two or more of oxidized wax and wax obtained by or (b) 3 to 6% by weight of waxes consisting of one or a mixture of two or more of hydrocarbon waxes, higher fatty acids, waxes obtained by inducing higher fatty acids, and oxidized waxes, by melting the waxes. 1. A method for producing a solid lubricant, which comprises stirring and mixing the mixture in the same state, and then forming the mixture into a homogeneous and dense solid by molding means such as injection or compression.