2965results about "Additives" patented technology

The invention relates to the technical field of lubricating oil, in particular to graphene composite rolling oil and a preparation method and application thereof. The rolling oil comprises base oil, branched oleic acid modified graphene containing quaternary ammonium salt, an anti-wear reagent at extreme pressure, an antioxidant, an anti-rust agent and a defoaming agent. Wherein the quaternary ammonium salt branched oleic acid is prepared through a thiol-ene click reaction and a quaternization reaction, and the dispersity, the interface adsorption strength and the high-temperature stability of graphene in a lubricating oil system can be remarkably improved. The product provided by the invention is suitable for rolling lubrication under severe working conditions such as high temperature and high load, and has a wide industrial application prospect.

The invention discloses a preparation method of modified self-extinguishing insulating oil with flame-retardant and self-repairing functions. Wherein the insulating liquid is mixed oil of mineral oil and palm oil-based modified natural ester, and the inherent high flash point characteristic of the natural ester improves the fireproof safety of the insulating oil. The modified hexagonal boron nitride (h-BN), the magnesium hydroxide nano material and the microcapsule repairing agent are added into the insulating oil, and the h-BN can capture free electrons in the oil, so that the formation and expansion of electric arcs are inhibited, and the breakdown voltage is improved. Magnesium hydroxide is heated to decompose and absorb heat, the fault temperature is reduced, and therefore the arc self-extinguishing effect is achieved. Under the action of a high electric field and a high temperature, the capsule wall of the microcapsule repairing agent is broken, meanwhile, the repairing material is released, a chemical reaction is carried out, and the insulating property of the insulating oil is repaired. The modified insulating oil prepared by the invention has high insulating strength and high flame retardance, and also has a performance self-repairing function, so that the service life of the insulating oil is prolonged.

To provide a novel lubricant agent additive and a novel lubricant agent composition that can reduce friction of a sliding part.SOLUTION: A lubricant agent additive comprises a polymer containing an olefin compound as a monomer unit or a modified polymer obtained by modifying a hydrogenated polymer with maleic acid or maleic anhydride. A lubricant agent composition comprises: a base oil; and a polymer containing an olefin compound as a monomer unit or a modified polymer obtained by modifying a hydrogenated polymer with maleic acid or maleic anhydride.SELECTED DRAWING: None

The instant disclosure generally relates to lubricating compositions having an oil of lubricating viscosity, an ashless phosphorus-containing antiwear agent an alkaline earth metal detergent, an ashless antioxidant, and an ashless dispersant where the lubricating compositions are substantially free of zinc and methods of lubricating an engine with such lubricating compositions. The instant lubricating compositions are useful as alternative lubricating compositions the reduce and / or eliminate zinc to achieve a desired performance goal of the lubricating composition.

The present invention relates to the field of corrosion prevention materials. Disclosed are anticorrosive oil and an anticorrosive material, and preparation methods therefor and the use thereof. The anticorrosive oil contains a monoalkoxy titanate, a dihydroxypropyl octadecanoate, an organosilicon defoaming agent, an antioxidant, modified nano silicon dioxide, nano titanium dioxide, graphene and aluminum tripolyphosphate, wherein the hydroxyl content of the modified nano silicon dioxide is 0.1-0.5 / nm2, and the particle size of the modified nano silicon dioxide satisfies: calculated on the basis that the particle size interval width is 5 nm, the range of particle size having the maximum proportion is 10-15 nm, and the proportion thereof is 45-55 wt%. There are no gaps between the layers of an anticorrosive material formed by means of the anticorrosive oil of the present invention, and the anticorrosive material has good sealing and good corrosion resistance, impact resistance and ultraviolet aging resistance, and can provide long-acting corrosion prevention for ocean steel piles.

The invention discloses a preparation method of a modified lubricating oil additive containing graphene-silicon dioxide, which comprises the following steps: preparing an RGO / SiO2 nano composite material additive with SiO2 grafted on graphene by a hydrothermal method, and adding oleic acid (OA) to participate in a hydrothermal reaction to prepare an OA-RGO / SiO2 nano composite material additive with SiO2 and OA grafted on graphene; according to the preparation method, the morphology size of the lubricating oil additive is optimized, and the tribological performance and dispersion stability of the lubricating oil additive are improved; the microstructure of the composite material is observed through an SEM scanning electron microscope, it is found that a sheet layer on the surface of the composite material added with oleic acid is thinner and wrinkled, the particle size of nano particles is smaller, the nano particles are wrapped by the sheet layer more tightly, and the nano particle diameter of the OA-RGO / SiO2 additive is reduced by 18.42% compared with that of an RGO / SiO2 additive; in a contact angle test, the nano additive in which oleic acid participates in a hydrothermal reaction can further reduce the surface energy of the nano additive, and the contact angle is greatly reduced.

A lubricating grease for electric vehicle applications includes thickener 6% by weight (wt. %) to 12 wt. %, lubricating oil 57 wt. % to 92.98 wt. %, and surface-active ester 1 wt. % to 10 wt. %. The lubricating grease also includes additives including friction reducer and modifier 0.1 wt. % to 5 wt. %, anti-wear agent 0.1 wt. % to 5 wt. %, and a balance of extreme pressure agent, oxidation inhibitor, and corrosion inhibitor.

The present invention provides a soluble cold rolling oil composition in which oil particles of approximately 0.1 μm or less are dispersed in water, and which has rolling properties (particularly anti-seizure properties) equal to or better than those of water-insoluble rolling oils and emulsion-type rolling oils, while enabling the gloss of products to be made uniform and enabling an improvement in unit consumption compared to emulsion-type rolling oils; and a cold rolling method using the composition. [Solution] A cold rolling oil composition containing (A) a base oil, (B) a specific fatty acid, (C) a specific sulfur-based extreme pressure agent, (D) a specific water-soluble polymer, and (E) a specific amine, and a cold rolling method using the same.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 40 wt.% of the composition and comprising a Group I base oil, a Group II base oil, or combinations thereof; ii) at least one optionally borated polyisobutylene succinimide (PIBSA-PAM) dispersant at from 0.25 wt.% to 12.0 wt.% of the composition, wherein the optionally borated PIBSA-PAM dispersant is selected from the group consisting of lower molecular weight PIB SA-PAM dispersant (Mn less than 1600 g / mol), higher molecular weight PIBSA-PAM dispersant (Mn 1600 g / mol or more), and combinations thereof; iii) at least one overbased metal containing detergent with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at a treat level to deliver between 100 to 5000 ppm by weight of total metal and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; and iv) the lubricating oil composition having a total sulfated ash of less than or equal to 2.5 wt.%, a total phosphorous level of less than or equal to 0.120 wt.%, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; and b) providing a fuel comprising hydrogen to the hydrogen fueled internal combustion engine; and c) combusting the fuel in the hydrogen fueled internal combustion engine. Also provided are lubricating oil compositions for use in a HICE to reduce the propensity for abnormal combustion events.

The invention belongs to the technical field of insulating oil, and provides a slow-release antioxidant as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing octadecyl trimethyl ammonium bromide, 2, 6-butylated hydroxytoluene, tetraethoxysilane, water and ammonia water, and reacting to obtain the antioxidant; and (2) in a protective atmosphere, mixing the antioxidant, ethanol, water and gamma-mercaptopropyltriethoxysilane, and carrying out a reaction so as to obtain the slow-release antioxidant. The slow-release antioxidant suitable for the synthetic ester insulating oil is prepared through a physical coating means and oleophylic modification, has excellent solubility, can effectively inhibit the increase of the acid value of the synthetic ester insulating oil, delays the oxidation process of the synthetic ester insulating oil, and remarkably prolongs the service life of the insulating oil. Meanwhile, through a slow release mechanism, the antioxidant can prolong the antioxidant effect of the antioxidant, improve the antioxidant stability in long-time operation and meet the higher antioxidant requirement of high-performance equipment such as a transformer for the insulating oil.

The present invention relates to a method for synthesizing graphene, and more particularly, to a method for synthesizing graphene by flash Joule heating (FJH). Such methods may be used to synthesize disordered graphene in large volumes, including low-defect disordered graphene. Such methods may further be used in the synthesis of composite materials and 2D materials.

To provide a lubricant composition having high metal corrosion resistance and capable of being suitably used for lubrication of an internal combustion engine using a fuel containing ammonia.SOLUTION: A lubricant composition used for lubrication of a marine engine using a fuel containing ammonia comprises a base oil (A), an amide-based compound (B), a metal deactivator (C), an organic zinc dithiophosphate (D), and a calcium-based detergent (E), wherein a content of the component (C) is less than 0.30 mass% based on the total amount of the lubricant composition, a content of the component (E) in terms of calcium atoms is 5,000 mass ppm or more based on the total amount of the lubricant composition, a base number of the lubricant composition is 10.0 or more, and a sulfated ash content of the lubricant composition is more than 1.10 mass%.SELECTED DRAWING: None

The invention provides high-temperature-resistant, mute and long-life bearing lubricating grease and a preparation method of the high-temperature-resistant, mute and long-life bearing lubricating grease, and belongs to the technical field of lubricating materials. The composite additive comprises a special antioxidant, a special anti-wear reagent at extreme pressure, an anti-rust preservative, a microencapsulation self-repairing agent and a noise inhibitor, and a rare earth organic complex can be further introduced as a high-temperature stabilizer according to needs, so that multi-performance synergy is realized. The comprehensive adaptability of the lubricating grease under the high-temperature-resistant condition is remarkably improved, the service life of a bearing is prolonged, energy consumption and noise are reduced, and the lubricating grease has outstanding technical advancement and application and popularization value.

A composition including a pyrolysis oil and, as an additive, one or more of: (a) an antioxidant; and (b) a stabilising additive selected from (i) alkoxylated amine compounds; (ii) aldehyde-alkylphenol copolymers; (iii) a quaternary ammonium salt, and mixtures thereof. A method and use for improving the stability of a composition including a pyrolysis oil by addition to the composition one or more of said additives is also provided.

A method of lubricating a fluid production pump may include mixing a polarized lubricant with water to produce a diluted lubricant. The method may additionally include creating a flowpath within the fluid production pump. An initial volume of the diluted lubricant may be circulated within the flowpath to allow the diluted lubricant to react with components of the fluid production pump and form a protective barrier on the components of the fluid production pump. The method may further comprise repeatedly introducing a periodic volume of diluted lubricant into the fluid production pump according to a predefined lubrication schedule.

The invention discloses tannic acid-oleylamine modified nano molybdenum disulfide as well as a preparation method and application thereof. The preparation method of the tannic acid-oleylamine modified nano-molybdenum disulfide comprises the following steps: 1) dispersing nano-molybdenum disulfide and tannic acid in a solvent, then adding ferric salt for reaction, and then carrying out product separation to obtain the tannic acid modified nano-molybdenum disulfide; and 2) dispersing the tannic acid modified nano molybdenum disulfide and oleylamine in a solvent for reaction, and then carrying out product separation to obtain the tannic acid-oleylamine modified nano molybdenum disulfide. The tannic acid-oleylamine modified nano molybdenum disulfide disclosed by the invention has the advantages of excellent friction reduction and wear resistance, good dispersity in ester oil, good compatibility with other additives and the like, the preparation raw materials are safe and non-toxic, the preparation method is simple, and the tannic acid-oleylamine modified nano molybdenum disulfide is suitable for large-scale industrial production and application.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) at least one overbased metal containing detergent with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at a treat level to deliver between 100 to 5000 ppm by weight of total metal and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; iii) at least one molybdenum containing compound included at a treat level to deliver between 20 to 2000 ppm by weight of total molybdenum to the composition; and iv) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorous level of less than or equal to 0.120 wt. %, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.

The present invention discloses a biomass-based ionic liquid-modified carbon quantum dots, a preparation method thereof, and a composite lubricant. The preparation method of the biomass-based ionic liquid-modified carbon quantum dots uses biomass raw materials, choline chloride, and amino acids to prepare carbon quantum dots and choline amino acid ionic liquid. The choline amino acid ionic liquid is used to modify the carbon quantum dots to produce a biomass composite lubricant. This uses renewable biomass resources instead of traditional petrochemical resources, is environmentally friendly, can be decomposed by nature, achieves clean production, and eliminates environmental pollution. The CQDs / ILs composite lubricant can function as "nanoballs," thereby improving its load-bearing capacity and reducing wear. In addition to having good lubricating properties, the choline amino acid ionic liquid also has good solubility. Modifying the carbon quantum dots with the choline amino acid ionic liquid not only improves the dispersibility of the carbon quantum dots but also further enhances their tribological properties.

The invention relates to the field of preparation of lubricating materials, in particular to a preparation method of composite phase change lubricating gel based on temperature-friction force synergistic response. The lubricating gel adopts a sandwich layered structure; the bottom layer is a porous ceramic layer formed by micro-arc oxidation, is filled with a disulfide bond dynamic network polymer and is anchored on a metal substrate; the middle layer comprises a microencapsulated phase change material which is dispersed in a polyurethane network containing dynamic disulfide bonds and is wetted with ionic liquid; the surface layer is an epoxy resin coating rich in boron nitride nanosheets, and a rapid heat conduction channel is constructed. Compared with the prior art, the lubricating state can be automatically adjusted in the friction process without external energy input, and the method has the advantages of being sensitive in multi-field coupling response, capable of achieving automatic antifriction protection, high in extreme working condition adaptability and the like.

The invention discloses environment-friendly metal cutting oil with high bearing capacity and high wear resistance, and belongs to the technical field of metal cutting fluid. The cutting fluid is composed of diisooctyl sebacate, a phosphate amine salt extreme pressure additive, a borate additive and a sulfurized extreme pressure additive, the sulfurized extreme pressure additive is sulfurized fatty acid ester and dialkyl pentasulfide (Rc2540), and the addition amount of the phosphate amine salt extreme pressure additive is 0.12-0.80% of the weight of base oil; the addition amount of the borate additive is 0.05-1.45% of the weight of the base oil, the addition amount of the sulfurized fatty acid ester is 0.10-0.85% of the weight of the base oil, and the addition amount of the dialkyl pentasulfide (Rc2540) is 0.20-0.85% of the weight of the base oil. The bearing capacity (Pb) of the cutting oil can reach more than 920N, and the diameter (Db) of a low-load long grinding scar can be less than 0.35 mm.

The invention discloses hydrolysis-resistant liquid phosphite ester and a preparation method and application thereof.The hydrolysis-resistant liquid phosphite ester is prepared by the steps that 2, 2, 4-trimethyl-1, 3-pentanediol and phosphorus trichloride or phosphite triester serve as raw materials, a cyclization reaction is conducted firstly, and then the hydrolysis-resistant liquid phosphite ester is obtained; and then carrying out nucleophilic substitution on Cl or aryl and alkyl on the cyclized intermediate by using higher saturated monohydric alcohol with more than C8, wherein the molecular structure is as shown in formula I in the specification. The liquid phosphite ester is novel liquid phosphite ester, the main body of the liquid phosphite ester is of a six-membered ring structure, the basic structure of the phosphite ester is reserved to the maximum extent, and the anti-oxidation effect of the phosphite ester is guaranteed; hydrophobic aliphatic chain structures on phosphorus atoms and branched chains of the phosphorus atoms prevent water molecules from approaching P-O bonds, so that the phosphorus atoms and the branched chains are prevented from being attacked by the water molecules, and the hydrolysis resistance is improved under the conditions that any additional amine hydrolysis-resistant agent is not used and any steric hindrance group is not introduced; good practical value, economic value and market prospect are realized.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 50 wt.% of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) at least one organoammonium tungstate compound included at a treat level to deliver between 10 to 5000 ppm by weight of total tungsten to the composition; iii) at least one overbased metal containing detergent with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at a treat level to deliver between 100 to 5000 ppm by weight of total metal and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; and iv) the lubricating oil composition having a total sulfated ash of less than or equal to 2.5 wt.%, a total phosphorous level of less than or equal to 0.120 wt.%, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are lubricating oil compositions and concentrates for use in a HICE to reduce the propensity for abnormal combustion events.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) an overbased metal-containing detergent comprising an overbased metal salicylate detergent, an overbased metal phenate detergent, or combinations thereof with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total metal and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; and iii) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorous level of less than or equal to 0.120 wt. %, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.

An additive for a lubricating oil containing a phosphorus compound P represented by the following formula (1):wherein R1 and R2 each independently represent an alkyl group having 1 to 3 carbon atoms, and n represents an integer of 0 to 3, wherein the phosphorus compound P contains a phosphorus compound PO wherein n is 0, a phosphorus compound P1 wherein n is 1, a phosphorus compound P2 where n is 2, and a phosphorus compound P3 wherein n is 3, and a total proportion of the phosphorus compound PO and the phosphorus 10 compound P1 in the phosphorus compound P is 60% by mole or more.

A method of lubricating a fluid production pump may include mixing a polarized lubricant with water to produce a diluted lubricant. The method may additionally include creating a flowpath within the fluid production pump. An initial volume of the diluted lubricant may be circulated within the flowpath to allow the diluted lubricant to react with components of the fluid production pump and form a protective barrier on the components of the fluid production pump. The method may further comprise repeatedly introducing a periodic volume of diluted lubricant into the fluid production pump according to a predefined lubrication schedule.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) an overbased magnesium containing detergent comprising an overbased magnesium salicylate, an overbased magnesium sulfonate, an overbased magnesium phenate, or combinations thereof with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total magnesium and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; iii) at least one overbased calcium containing detergent with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at a treat level to deliver greater than 100 ppm by weight of total calcium to the composition; and iv) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorous level of less than or equal to 0.120 wt. %, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or OW-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.

This disclosure relates to the use of di-aralkyl substituted phenylamine / mono-aralkyl substituted phenylamine combinations as antioxidants in lubricant compositions having good oxidation properties in internal combustion engine applications, especially in compression ignited engine and or spark ignited engine applications.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) at least one overbased metal containing detergent with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at a treat level to deliver between 100 to 5000 ppm by weight of total metal and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; iii) at least one silicon containing compound included at a treat level to deliver between 50 to 900 ppm by weight of total silicon to the composition; and iv) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorous level of less than or equal to 0.120 wt. %, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.

Embodiments herein relate to lubricating coatings comprising polyacrylic acid for medical devices. In an embodiment, a medical device includes a lubricious coating having a substrate and a first layer disposed on the substrate. The first layer may include a photoreactive polyvinylpyrrolidone, a non-photoreactive polyvinylpyrrolidone, and a crosslinking compound. The second layer may be disposed on the first layer, the second layer may include poly (acrylic acid) and a non-photoreactive polyvinylpyrrolidone. The non-photoreactive polyvinylpyrrolidone of the second layer forms a composite with the poly (acrylic acid) of the second layer. The non-photoreactive polyvinylpyrrolidone of the second layer has a concentration that is present in a gradient in the thickness direction of the second layer, wherein the concentration at the outer surface of the second layer is lower than the concentration at the inner surface of the second layer. Other embodiments are also included herein.

Provided are a coating composition for an endoscope, the coating composition including a solid lubricant, a thermosetting resin, a solvent, and a nonionic dispersing agent, in which the nonionic dispersing agent is a compound constituted by a carbon element, a hydrogen element, and at least one of an oxygen element or a nitrogen element; a lubricating member that is suitable as a member for an endoscope and that has been subjected to a coating treatment with the coating composition and a method for manufacturing the lubricating member, and a flexible tube for an endoscope and an endoscope that use the lubricating member.