Engine oil for hydrogen fuel internal combustion engine and method for producing the same

Abstract

The application relates to a machine oil for a hydrogen fuel internal combustion engine and a preparation method thereof, wherein the machine oil for the hydrogen fuel internal combustion engine comprises, in terms of mass fraction, 89-92% of synthetic base oil, 1.2-2.5% of tackifier, 2.2-3.8% of emulsifier and foam stabilizer together, 0.5-0.8% of friction modifier, and 2.15-4.1% of antioxidant and antinitrating agent together. The application provides a machine oil for a hydrogen fuel internal combustion engine and a preparation method thereof, changes a traditional machine oil formula idea according to the hydrogen fuel characteristics, selects and optimizes the type and proportion of the synthetic base oil and the additive, makes the machine oil and water in a wide range of proportions to form a stable and uniform emulsion after mixing, improves the emulsion performance, and prolongs the oil change cycle. The application solves the lubrication problem of the hydrogen fuel engine, provides strong support for mass production of the hydrogen fuel internal combustion engine, and accelerates the carbon neutralization pace of the internal combustion engine.

Description

Technical Field

[0001] This application relates to the field of engine oil preparation technology, and in particular to an engine oil for hydrogen fuel cell internal combustion engines and its preparation method. Background Technology

[0002] The "carbon neutrality" of internal combustion engines primarily depends on the "carbon neutrality" of energy sources and the development of matching internal combustion engine technologies. Among renewable and clean energy sources suitable for internal combustion engines, hydrogen energy is considered the most promising clean energy source of the 21st century due to its clean, low-carbon, and diverse characteristics. Hydrogen fuel cell internal combustion engines only require minor modifications to traditional internal combustion engines and the addition of hydrogen fuel supply system components; therefore, hydrogen fuel cell internal combustion engine vehicles are seen as an ideal future development direction.

[0003] Due to the high costs of hydrogen fuel storage, transportation, and application, research on hydrogen fuel cell internal combustion engines in China is still in the development stage. Currently, there are no engine oils specifically designed for hydrogen fuel cell internal combustion engines on the market.

[0004] In China, traditional engine oils are generally used to support the development of hydrogen fuel cell internal combustion engines. Currently, the highest quality level of gasoline engine lubricating oil is the SP / GF-6 level set by the American Petroleum Institute (API) and the International Lubricants Standardization and Certification Committee (ILSAC).

[0005] Hydrogen fuel cell internal combustion engines operate using conventional engine oils, resulting in very short oil change intervals. However, because the primary emission of hydrogen fuel cell internal combustion engines is water, water vapor entering the lubrication system leads to a very high water content in conventional engine oils, causing stratification and affecting the engine's normal operation. Furthermore, the high thermal efficiency of hydrogen fuel cell internal combustion engines accelerates the oxidation and nitration of oil components, producing deposits and further shortening oil change intervals.

[0006] In addition, metal parts in hydrogen fuel cell internal combustion engines are prone to hydrogen embrittlement, a problem that traditional engine oils cannot mitigate. Summary of the Invention

[0007] This application provides an engine oil for a hydrogen fuel cell internal combustion engine and its preparation method, in order to solve the problem that the oil change cycle of a hydrogen fuel cell internal combustion engine is too short when using traditional engine oil to support it in related technologies.

[0008] In a first aspect, an engine oil for a hydrogen fuel cell internal combustion engine is provided, comprising, by mass fraction:

[0009] Synthetic base oil accounts for 89%–92%, viscosity index improver accounts for 1.2%–2.5%, emulsifier and foam stabilizer together account for 2.2%–3.8%, friction modifier accounts for 0.5%–0.8%, and antioxidant and antinitrification agent together account for 2.15%–4.1%.

[0010] In some embodiments, the synthetic base oil includes polyalphaolefin base oil and polyol ester base oil.

[0011] In some embodiments, the mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.5~2.5.

[0012] In some embodiments, the polyol ester base oil is a neopentyl polyol ester.

[0013] In some embodiments, the neopentyl polyol ester includes one or more of neopentyl glycol ester and pentaerythritol ester.

[0014] In some embodiments, the adhesive finger includes one or more of polymethacrylate, hydrogenated styrene diene copolymer, ethylene propylene copolymer, and polyisobutylene.

[0015] In some embodiments, the mass ratio of the emulsifier to the foam stabilizer is 2 to 6:1.

[0016] In some embodiments, the emulsifier includes one or more of polyoxypropylene lanolin ether, polyoxyethylene lanolin derivative, and polyoxyethylene lanolin ether.

[0017] In some embodiments, the polyoxyethylene lanolin derivative includes one or more of polyoxyethylene lanolin alcohol and polyoxyethylene lanolin wax.

[0018] In some embodiments, the foam stabilizer includes one or more of polyoxyethylene sorbitan fatty acid ester and sodium fatty alcohol polyoxyethylene ether sulfate.

[0019] In some embodiments, the friction modifier includes molybdenum-based friction modifiers and organic friction modifiers.

[0020] In some embodiments, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:0.8 to 1.2.

[0021] In some embodiments, the molybdenum-based friction modifier includes one or more of molybdenum dithiophosphate and sulfonated molybdenum oxydi-2-ethylhexyl dithiophosphate.

[0022] In some embodiments, the organic friction modifier includes one or more of imides and imide derivatives.

[0023] In some embodiments, the imide derivative comprises one or more of epoxy imides and aliphatic amides.

[0024] In some embodiments, the mass ratio of the antioxidant to the antinitrification agent is 1 to 2:5.

[0025] In some embodiments, the antioxidant comprises one or more of alkyl diphenylamine and octadecyl propionate.

[0026] In some embodiments, the antinitrifying agent comprises one or more of sulfathiazole, dicyandiamide, thiourea-N-2,5-dichlorophenylbutyramide, and amidothiourea.

[0027] Secondly, a method for preparing engine oil for hydrogen fuel cell internal combustion engines as described in any of the above-mentioned methods is provided, comprising the following steps:

[0028] Based on mass fraction, 89%–92% synthetic base oil, 1.2%–2.5% viscosity index improver, 2.2%–3.8% emulsifier and foam stabilizer, 0.5%–0.8% friction modifier, and 2.15%–4.1% antioxidant and antinitrification agent are added to the reactor, stirred and mixed evenly, and reacted at a preset temperature for a preset time.

[0029] In some embodiments, the preset temperature is 51℃~57℃ and the preset time is 20~24h.

[0030] The beneficial effects of the technical solution provided in this application include:

[0031] This application provides an engine oil for hydrogen fuel cell internal combustion engines and its preparation method. Targeting the characteristics of hydrogen fuel, it changes the traditional engine oil formulation approach. Through the selection and optimization of synthetic base oils and additive types and ratios, the engine oil mixes with water in a wide range of proportions to form a stable and homogeneous emulsion, improving emulsion performance and extending oil change intervals. This application solves the lubrication problem of hydrogen fuel cell engines, providing strong support for the mass production of hydrogen fuel cell internal combustion engines and accelerating the "carbon neutrality" of internal combustion engines. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A flowchart illustrating the method for preparing engine oil for hydrogen fuel cell internal combustion engines provided in this application embodiment. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] This application provides an engine oil for hydrogen fuel cell internal combustion engines, which solves the problem in related technologies that traditional engine oils can only support the operation of hydrogen fuel cell internal combustion engines for about 50 hours and that the oil change cycle of hydrogen fuel cell internal combustion engines is too short.

[0036] This application provides an engine oil for a hydrogen fuel cell internal combustion engine, which, by mass fraction, comprises: 89%–92% synthetic base oil, 1.2%–2.5% viscosity index enhancer, 2.2%–3.8% emulsifier and foam stabilizer combined, 0.5%–0.8% friction modifier, and 2.15%–4.1% antioxidant and antinitrification agent combined.

[0037] Addressing the characteristics of hydrogen fuel, this application modifies traditional engine oil formulations by optimizing the selection and proportion of synthetic base oils and additives. This allows the engine oil to form a stable and homogeneous emulsion when mixed with water in a wide range of proportions, improving emulsion performance and extending oil change intervals. This application solves the lubrication challenges of hydrogen fuel cell engines, providing strong support for the mass production of hydrogen fuel cell internal combustion engines and accelerating the process of achieving carbon neutrality in internal combustion engines.

[0038] Among the aforementioned engine oils used in hydrogen fuel cell internal combustion engines, the synthetic base oil is a compounded engine oil, specifically, the synthetic base oil includes polyalphaolefin base oil and polyol ester base oil.

[0039] To meet the airtightness requirements of rubber seals throughout the entire life cycle of hydrogen fuel cell internal combustion engines, the engine oil and the rubber material of the seals must have excellent compatibility. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.5~2.5.

[0040] There are several options for the polyol ester base oils mentioned above. As an example, the polyol ester base oils include neopentyl polyol esters.

[0041] Furthermore, neopentyl polyol esters include one or more of neopentyl glycol esters and pentaerythritol esters.

[0042] The adhesive finger binder can be selected from a variety of options. As an example, the adhesive finger binder includes one or more of polymethacrylate, hydrogenated styrene diene copolymer, ethylene propylene copolymer and polyisobutylene.

[0043] To ensure that the oil can be mixed with water in a wide range of proportions to form a stable and uniform microemulsion with a diameter of <10 μm, the mass ratio of the emulsifier to the foam stabilizer is 2–6:1. Only microemulsions with a diameter <10 μm can guarantee lubricating performance similar to that of lubricating oil; larger microemulsions cannot form a stable oil film.

[0044] The above-mentioned emulsifiers can be selected from a variety of options. As an example, the emulsifiers include one or more of polyoxypropylene lanolin ether, polyoxyethylene lanolin derivative, and polyoxyethylene lanolin ether.

[0045] Among them, polyoxyethylene lanolin derivatives include one or more of polyoxyethylene lanolin alcohol and polyoxyethylene lanolin wax.

[0046] The foam stabilizers mentioned above are a variety of options. As an example, the foam stabilizers include one or more of polyoxyethylene sorbitan fatty acid esters and sodium fatty alcohol polyoxyethylene ether sulfate.

[0047] The aforementioned friction modifier is a compound friction modifier, which includes molybdenum-based friction modifiers and organic friction modifiers.

[0048] To ensure that the anti-wear properties of the used oil are consistent with or better than those of the new oil, and to improve the hydrogen embrittlement problem of metal parts, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:0.8 to 1.2.

[0049] There are several options for the above-mentioned molybdenum-based friction modifiers. As an example, the molybdenum-based friction modifiers include one or more of molybdenum dithiophosphate and sulfonated di-2-ethylhexyl dithiophosphate oxymolybdenum.

[0050] The above-mentioned organic friction modifiers are available in various forms. As an example, the organic friction modifiers include one or more of imides and imide derivatives.

[0051] Among them, the imide derivatives include one or more of epoxy imides and aliphatic amides.

[0052] To ensure the oxidation stability of the oil, the mass ratio of the antioxidant to the antinitrification agent is 1~2:5.

[0053] The antioxidants mentioned above are a variety of choices. As an example, the antioxidants include one or more of alkyl diphenylamine and octadecyl propionate.

[0054] The above-mentioned antinitrifying agents are available in various forms. As an example, the antinitrifying agents include one or more of sulfathiazole, dicyandiamide, thiourea-N-2,5-dichlorophenylbutadiamide, and amidothiourea.

[0055] This application also provides a method for preparing engine oil for hydrogen fuel cell internal combustion engines, which includes the following steps:

[0056] 101: Weigh out 89%–92% synthetic base oil, 1.2%–2.5% viscosity index improver, 2.2%–3.8% emulsifier and foam stabilizer, 0.5%–0.8% friction modifier, and 2.15%–4.1% antioxidant and antinitrification agent by mass fraction.

[0057] 102: Add 89%–92% synthetic base oil, 1.2%–2.5% viscosity index improver, 2.2%–3.8% emulsifier and foam stabilizer, 0.5%–0.8% friction modifier, and 2.15%–4.1% antioxidant and antinitrification agent to a reaction vessel, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0058] The preset temperature is 51℃~57℃, and the preset time is 20~24h.

[0059] The present application will now be further described in conjunction with specific embodiments and comparative examples.

[0060] Example 1

[0061] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent.

[0062] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.5.

[0063] The mass fraction of the polyalphaolefin base oil is 35.9%.

[0064] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 54%.

[0065] The adhesive finger agent is polyisobutylene, and the mass fraction of the polyisobutylene is 2.4%.

[0066] The mass ratio of the emulsifier to the foam stabilizer is 1.7:1.

[0067] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 1.9%.

[0068] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 1.1%.

[0069] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.

[0070] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.4%.

[0071] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.4%.

[0072] The mass ratio of the antioxidant to the antinitrification agent is 1:2.5.

[0073] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 1.1%.

[0074] The antinitrifying agent comprises sulfathiazole and thiourea-N-2,5-dichlorophenylbutyramide, wherein the mass fraction of sulfathiazole is 1.1% and the mass fraction of thiourea-N-2,5-dichlorophenylbutyramide is 1.7%.

[0075] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0076] 101: Weigh out 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent by mass fraction.

[0077] 102: Add 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0078] The preset temperature is 55℃ and the preset time is 20h.

[0079] Example 2

[0080] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent.

[0081] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.5.

[0082] The mass fraction of the polyalphaolefin base oil is 35.9%.

[0083] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 54%.

[0084] The adhesive is made of polymethacrylate, and the mass fraction of the polymethacrylate is 2.4%.

[0085] The mass ratio of the emulsifier to the foam stabilizer is 5:1.

[0086] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 2.5%.

[0087] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.5%.

[0088] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.

[0089] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.4%.

[0090] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.4%.

[0091] The mass ratio of the antioxidant to the antinitrification agent is 1:2.5.

[0092] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 1.1%.

[0093] The antinitrifying agent comprises sulfathiazole and thiourea-N-2,5-dichlorophenylbutyramide, wherein the mass fraction of sulfathiazole is 1.1% and the mass fraction of thiourea-N-2,5-dichlorophenylbutyramide is 1.7%.

[0094] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0095] 101: Weigh out 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent by mass fraction.

[0096] 102: Add 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0097] The preset temperature is 55℃ and the preset time is 20h.

[0098] Example 3

[0099] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent.

[0100] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.5.

[0101] The mass fraction of the polyalphaolefin base oil is 35.9%.

[0102] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 54%.

[0103] The adhesive is an ethylene-propylene copolymer, and the mass fraction of the ethylene-propylene copolymer is 2.4%.

[0104] The mass ratio of the emulsifier to the foam stabilizer is 5:1.

[0105] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 2.5%.

[0106] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.5%.

[0107] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.

[0108] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.4%.

[0109] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.4%.

[0110] The mass ratio of the antioxidant to the antinitrification agent is 1:2.5.

[0111] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 1.1%.

[0112] The antinitrifying agent comprises sulfathiazole and amidothiourea, wherein the mass fraction of sulfathiazole is 1.1% and the mass fraction of amidothiourea is 1.7%.

[0113] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0114] 101: Weigh out 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent by mass fraction.

[0115] 102: Add 89.9% synthetic base oil, 2.4% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.9% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0116] The preset temperature is 55℃ and the preset time is 20h.

[0117] Example 4

[0118] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent.

[0119] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:2.5.

[0120] The mass fraction of the polyalphaolefin base oil is 26.3%.

[0121] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 65.7%.

[0122] The adhesive is a hydrogenated styrene diene copolymer, and the mass fraction of the hydrogenated styrene diene copolymer is 1.5%.

[0123] The mass ratio of the emulsifier to the foam stabilizer is 6:1.

[0124] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 2.53%.

[0125] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.5%.

[0126] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.17.

[0127] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.23%.

[0128] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.27%.

[0129] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0130] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.5%.

[0131] The antinitrifying agent includes sulfathiazole and dicyandiamide, wherein the mass fraction of sulfathiazole is 0.75% and the mass fraction of dicyandiamide is 1.25%.

[0132] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0133] 101: Weigh out 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0134] 102: Add 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0135] The preset temperature is 55℃ and the preset time is 20h.

[0136] Example 5

[0137] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 2% viscosity index improver, 3% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent.

[0138] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:2.5.

[0139] The mass fraction of the polyalphaolefin base oil is 26.3%.

[0140] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 65.7%.

[0141] The adhesive is a hydrogenated styrene diene copolymer, and the mass fraction of the hydrogenated styrene diene copolymer is 2%.

[0142] The mass ratio of the emulsifier to the foam stabilizer is 5:1.

[0143] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 2.5%.

[0144] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.5%.

[0145] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.17.

[0146] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.23%.

[0147] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.27%.

[0148] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0149] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.5%.

[0150] The antinitrifying agent comprises sulfathiazole and thiourea-N-2,5-dichlorophenylbutyramide, wherein the mass fraction of sulfathiazole is 0.75% and the mass fraction of thiourea-N-2,5-dichlorophenylbutyramide is 1.25%.

[0151] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0152] 101: Weigh out 92% synthetic base oil, 2% viscosity index enhancer, 3.0% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0153] 102: Add 92% synthetic base oil, 2% viscosity index improver, 3.0% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0154] The preset temperature is 55℃ and the preset time is 20h.

[0155] Example 6

[0156] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 1.6% viscosity index enhancer, 3.4% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent.

[0157] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:2.5.

[0158] The mass fraction of the polyalphaolefin base oil is 26.3%.

[0159] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 65.7%.

[0160] The adhesive is a hydrogenated styrene diene copolymer, and the mass fraction of the hydrogenated styrene diene copolymer is 1.6%.

[0161] The mass ratio of the emulsifier to the foam stabilizer is 7.5:1.

[0162] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 3%.

[0163] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.4%.

[0164] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.17.

[0165] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.23%.

[0166] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.27%.

[0167] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0168] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.5%.

[0169] The antinitrifying agent comprises sulfathiazole and thiourea-N-2,5-dichlorophenylbutyramide, wherein the mass fraction of sulfathiazole is 0.75% and the mass fraction of thiourea-N-2,5-dichlorophenylbutyramide is 1.25%.

[0170] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0171] 101: Weigh out 92% synthetic base oil, 1.6% viscosity index improver, 3.4% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0172] 102: Add 92% synthetic base oil, 1.6% viscosity index improver, 3.4% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0173] The preset temperature is 55℃ and the preset time is 20h.

[0174] Table 1 Formulation Tables for Examples 1 to 6

[0175]

[0176] The emulsification characteristics and stability of the finished engine oils from Examples 1-6 with a certain proportion of water were investigated. Specific results are shown in Table 2 below.

[0177] Table 2. Emulsification characteristics and stability results of finished engine oil with a certain proportion of water.

[0178]

[0179] The results above show that, in order to mix the oil with a wide range of water proportions, a stable and uniform microemulsion with a diameter of <10μm can be formed. As shown in Table 2 above, the engine oil provided in this application embodiment, after adding emulsifiers and foam stabilizers, did not show water separation after 168 hours for 1% water, while for 10% water, separation only occurred after 168 hours. Compared with the prior art where separation occurs in about 50 hours, this application greatly extends the separation time and extends the oil change cycle.

[0180] Furthermore, as seen in Examples 1 to 6 above, when the mass ratio of emulsifier to foam stabilizer is not within the preferred range of 2:1 to 6:1, such as 1.7:1 in Example 1, the emulsifier content in the finished engine oil is relatively low. As the test time extends, the surface tension balance of the foam is disrupted, resulting in defoaming, separation of the water layer, and affecting the operation of the internal combustion engine.

[0181] For example, in Example 6, the ratio of 7.5:1 indicates a relatively high emulsifier content in the finished engine oil. As the test time increases, the emulsifier accumulates and deposits, causing defoaming and separation of the water layer, which affects the operation of the internal combustion engine.

[0182] Example 7

[0183] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent.

[0184] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil, wherein the mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.

[0185] The polyalphaolefin base oil has a mass fraction of 46%.

[0186] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 46%.

[0187] The adhesive finger agent is polyisobutylene, and the mass fraction of the polyisobutylene is 1.5%.

[0188] The mass ratio of the emulsifier to the foam stabilizer is 6:1.

[0189] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 3.0%.

[0190] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.5%.

[0191] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.17.

[0192] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.23%.

[0193] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.27%.

[0194] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0195] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.5%.

[0196] The antinitrifying agent comprises sulfathiazole and amidothiourea, wherein the mass fraction of sulfathiazole is 0.75% and the mass fraction of amidothiourea is 1.25%.

[0197] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0198] 101: Weigh out 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0199] 102: Add 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0200] The preset temperature is 55℃ and the preset time is 20h.

[0201] Example 8

[0202] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 89.9% synthetic base oil, 2.5% viscosity index improver, 3.8% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.0% antioxidant and antinitrification agent.

[0203] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.5.

[0204] The mass fraction of the polyalphaolefin base oil is 35.6%.

[0205] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 54.3%.

[0206] The adhesive is an ethylene-propylene copolymer, and the mass fraction of the ethylene-propylene copolymer is 2.5%.

[0207] The mass ratio of the emulsifier to the foam stabilizer is 6:1.

[0208] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 3.26%.

[0209] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.54%.

[0210] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.16.

[0211] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.37%.

[0212] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.43%.

[0213] The mass ratio of the antioxidant to the antinitrification agent is 1:5.

[0214] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.54%.

[0215] The antinitrifying agent comprises sulfathiazole and amidothiourea, wherein the mass fraction of sulfathiazole is 1.25% and the mass fraction of amidothiourea is 1.25%.

[0216] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0217] 101: Weigh out 89.9% synthetic base oil, 2.5% viscosity index improver, 3.8% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.0% antioxidant and antinitrification agent by mass fraction.

[0218] 102: Add 89.9% synthetic base oil, 2.5% viscosity index improver, 3.8% emulsifier and foam stabilizer, 0.8% friction modifier, and 3.0% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0219] The preset temperature is 55℃ and the preset time is 20h.

[0220] Example 9

[0221] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 1.2% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and anti-nitrification agent.

[0222] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:2.5.

[0223] The mass fraction of the polyalphaolefin base oil is 26.3%.

[0224] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 65.7%.

[0225] The adhesive is made of polymethacrylate, and the mass fraction of the polymethacrylate is 1.2%.

[0226] The mass ratio of the emulsifier to the foam stabilizer is 3.8:1.

[0227] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 2.77%.

[0228] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.73%.

[0229] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:0.8.

[0230] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.44%.

[0231] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.36%.

[0232] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0233] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.5%.

[0234] The antinitrifying agent comprises dicyandiamide and thiourea-N-2,5-dichlorophenylbutyramide, wherein the mass fraction of the dicyandiamide is 0.75% and the mass fraction of the thiourea-N-2,5-dichlorophenylbutyramide is 1.25%.

[0235] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0236] 101: Weigh out 92% synthetic base oil, 1.2% viscosity index enhancer, 3.5% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0237] 102: Add 92% synthetic base oil, 1.2% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0238] The preset temperature is 55℃ and the preset time is 20h.

[0239] Example 10

[0240] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 1.7% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent.

[0241] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:2.5.

[0242] The mass fraction of the polyalphaolefin base oil is 26.5%.

[0243] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 65.5%.

[0244] The adhesive is a hydrogenated styrene diene copolymer, and the mass fraction of the hydrogenated styrene diene copolymer is 1.7%.

[0245] The mass ratio of the emulsifier to the foam stabilizer is 1:1.

[0246] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 1.5%.

[0247] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 1.5%.

[0248] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:0.86.

[0249] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.37%.

[0250] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.43%.

[0251] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0252] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.5%.

[0253] The antinitrifying agent comprises sulfathiazole-thiourea-N-2,5-dichlorophenylbutyramide, wherein the mass fraction of sulfathiazole is 0.75% and the mass fraction of thiourea-N-2,5-dichlorophenylbutyramide is 1.25%.

[0254] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0255] 101: Weigh out 92% synthetic base oil, 1.7% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0256] 102: Add 92% synthetic base oil, 1.7% viscosity index improver, 3% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0257] The preset temperature is 55℃ and the preset time is 20h.

[0258] Example 11

[0259] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 2.47% viscosity index improver, 2.23% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent.

[0260] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil. The mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:2.5.

[0261] The mass fraction of the polyalphaolefin base oil is 26.5%.

[0262] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 65.5%.

[0263] The adhesive is made of polymethacrylate, and the mass fraction of the polymethacrylate is 2.47%.

[0264] The mass ratio of the emulsifier to the foam stabilizer is 2:1.

[0265] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 1.5%.

[0266] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.73%.

[0267] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:0.8.

[0268] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.44%.

[0269] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.36%.

[0270] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0271] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.4%.

[0272] The antinitrifying agent includes sulfathiazole and dicyandiamide, wherein the mass fraction of sulfathiazole is 0.75% and the mass fraction of dicyandiamide is 1.25%.

[0273] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0274] 101: Weigh out 92% synthetic base oil, 2.47% viscosity index enhancer, 2.23% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0275] 102: Add 92% synthetic base oil, 2.47% viscosity index improver, 2.23% emulsifier and foam stabilizer, 0.8% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0276] The preset temperature is 55℃ and the preset time is 20h.

[0277] Example 12

[0278] This embodiment provides an engine oil for a hydrogen fuel cell internal combustion engine. By mass fraction, the engine oil for a hydrogen fuel cell internal combustion engine comprises: 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent.

[0279] The synthetic base oil comprises polyalphaolefin base oil and polyol ester base oil, with a mass ratio of 1:3 between the polyalphaolefin base oil and the polyol ester base oil.

[0280] The polyalphaolefin base oil has a mass fraction of 23%.

[0281] The polyol ester base oil is a neopentyl polyol ester, specifically a neopentyl glycol ester, and the mass fraction of the neopentyl glycol ester is 69%.

[0282] The adhesive is a hydrogenated styrene diene copolymer, and the mass fraction of the hydrogenated styrene diene copolymer is 1.5%.

[0283] The mass ratio of the emulsifier to the foam stabilizer is 6:1.

[0284] The emulsifier is polyoxypropylene lanolin ether, and the mass fraction of the polyoxypropylene lanolin ether is 3%.

[0285] The foam stabilizer is polyoxyethylene sorbitan fatty acid ester, and the mass fraction of the polyoxyethylene sorbitan fatty acid ester is 0.5%.

[0286] The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. Specifically, the mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:1.17.

[0287] Specifically, the molybdenum-based friction modifier is molybdenum dithiophosphate, and the mass fraction of molybdenum dithiophosphate is 0.23%.

[0288] The aforementioned organic friction modifier uses an imide, and the mass fraction of the imide is 0.27%.

[0289] The mass ratio of the antioxidant to the antinitrification agent is 1:4.

[0290] The antioxidant is alkyl diphenylamine, and the mass fraction of the alkyl diphenylamine is 0.5%.

[0291] The antinitrifying agent includes sulfathiazole and dicyandiamide, wherein the mass fraction of sulfathiazole is 0.75% and the mass fraction of dicyandiamide is 1.25%.

[0292] The preparation method of the above-mentioned engine oil for hydrogen fuel cell internal combustion engines includes the following steps:

[0293] 101: Weigh out 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent by mass fraction.

[0294] 102: Add 92% synthetic base oil, 1.5% viscosity index improver, 3.5% emulsifier and foam stabilizer, 0.5% friction modifier, and 2.5% antioxidant and antinitrification agent to a reactor, stir and mix evenly, and react at a preset temperature for a preset time to obtain engine oil for hydrogen fuel internal combustion engines.

[0295] The preset temperature is 55℃ and the preset time is 20h.

[0296] Table 3 Formulations for Examples 7 to 12

[0297]

[0298] The compatibility of the finished machine oils of Examples 7-12 with ethylene acrylate rubber was investigated at 150℃ for 168h. The results are shown in Table 4.

[0299] Table 4 Compatibility results between finished engine oil and ethylene acrylate rubber

[0300]

[0301] The results above indicate that the synthetic base oil is a blend of polyalphaolefin and polyol ester base oils. To meet the airtightness requirements of rubber seals in hydrogen fuel cell internal combustion engines, the preferred ratio is 1:1.5 to 1:2.5. When the ratio is outside the preferred range, such as in Example 7, where the ratio of polyalphaolefin base oil to neopentyl polyol ester is 1:1 (lower than 1:1.5), the finished oil causes the sealant rubber additives to precipitate and shrink, resulting in a reduction in the volume of the seal after a period of oil resistance, which does not meet the airtightness requirements of hydrogen fuel cell internal combustion engine seals.

[0302] For example, in Example 12, the ratio of polyalphaolefin base oil to neopentyl polyol ester is 1:3, which is higher than 1:2.5. This finished oil may seep into the sealing rubber, causing swelling, reducing the mechanical strength and durability of the rubber, and failing to meet the airtightness requirements of hydrogen internal combustion engine seals.

[0303] The frictional properties of the emulsions formed by mixing the finished engine oils from Examples 8 and 9 with a certain proportion of water were investigated. The specific results are shown in Table 5 below.

[0304] Table 5. Results of the frictional properties of the emulsion

[0305]

[0306] The results above show that the emulsion formed by mixing the finished engine oil prepared using the preferred formulation of this application with water in a wide range of proportions exhibits frictional characteristics even superior to those of crude oil. This indicates that the special engine oil formulated according to this application, after running on a hydrogen fuel cell internal combustion engine for a period of time and mixing with a large amount of water, can form a stable and homogeneous emulsion, and this emulsion still has good lubricating properties, greatly extending the oil change interval of the hydrogen fuel cell internal combustion engine.

[0307] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0308] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0309] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An engine oil for a hydrogen fuel cell internal combustion engine, characterized in that, Based on mass fraction, it includes: Synthetic base oil accounts for 89%–92%, viscosity index improver accounts for 1.2%–2.5%, emulsifier and foam stabilizer together account for 2.2%–3.8%, friction modifier accounts for 0.5%–0.8%, and antioxidant and antinitrification agent together account for 2.15%–4.1%. The synthetic base oil is composed of polyalphaolefin base oil and polyol ester base oil, wherein the mass ratio of the polyalphaolefin base oil to the polyol ester base oil is 1:1.5~2.

5. The mass ratio of the emulsifier to the foam stabilizer is 2 to 6:1; The friction modifier includes a molybdenum-based friction modifier and an organic friction modifier. The organic friction modifier includes one or more imides and imide derivatives. The mass ratio of the molybdenum-based friction modifier to the organic friction modifier is 1:0.8 to 1.

2.

2. The engine oil for hydrogen fuel cell internal combustion engines as described in claim 1, characterized in that: The polyol ester base oil is a neopentyl polyol ester.

3. The engine oil for hydrogen fuel cell internal combustion engines as described in claim 2, characterized in that: The neopentyl polyol esters include one or more of neopentyl glycol esters and pentaerythritol esters.

4. The engine oil for hydrogen fuel cell internal combustion engines as described in claim 1, characterized in that: The adhesive includes one or more of polymethyl methacrylate, hydrogenated styrene diene copolymer, ethylene propylene copolymer, and polyisobutylene.

5. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 1, characterized in that: The emulsifier includes one or more of polyoxypropylene lanolin ether, polyoxyethylene lanolin derivative, and polyoxyethylene lanolin ether.

6. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 5, characterized in that: The polyoxyethylene lanolin derivatives include one or more of polyoxyethylene lanolin alcohol and polyoxyethylene lanolin wax.

7. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 1, characterized in that: The foam stabilizer includes one or more of polyoxyethylene sorbitan fatty acid ester and sodium fatty alcohol polyoxyethylene ether sulfate.

8. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 1, characterized in that: The molybdenum-based friction modifier includes one or more of molybdenum dithiophosphate and sulfonated molybdenum oxydi-2-ethylhexyl dithiophosphate.

9. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 1, characterized in that: The imide derivative comprises one or more of epoxy imides and aliphatic amides.

10. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 1, characterized in that: The mass ratio of the antioxidant to the antinitrification agent is 1~2:

5.

11. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 1, characterized in that: The antioxidant comprises one or more of alkyl diphenylamine and octadecyl propionate.

12. The engine oil for a hydrogen fuel cell internal combustion engine as described in claim 1, characterized in that: The antinitrifying agent comprises one or more of sulfathiazole, dicyandiamide, thiourea-N-2,5-dichlorophenylbutyramide, and amidothiourea.

13. A method for preparing engine oil for a hydrogen fuel cell internal combustion engine as described in any one of claims 1 to 12, characterized in that, It includes the following steps: Based on mass fraction, 89%–92% synthetic base oil, 1.2%–2.5% viscosity index improver, 2.2%–3.8% emulsifier and foam stabilizer, 0.5%–0.8% friction modifier, and 2.15%–4.1% antioxidant and antinitrification agent are added to the reactor, stirred and mixed evenly, and reacted at a preset temperature for a preset time.

14. The method for preparing engine oil for hydrogen fuel cell internal combustion engines as described in claim 13, characterized in that, The preset temperature is 51℃~57℃, and the preset time is 20~24h.

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