Methanol fuel additive and methanol fuel

Abstract

The invention relates to the technical field of fuels and additives, in particular to a methanol fuel additive and a methanol fuel. The methanol fuel additive comprises the following components in parts by weight: 2-8 parts of a metal corrosion inhibitor, 25-35 parts of an anti-wear lubricant, 30-40 parts of a purification dispersant, 4-10 parts of an antioxidant, 20-40 parts of a solvent and 3-8 parts of an auxiliary additive, wherein the metal corrosion inhibitor is selected from an imidazoline metal corrosion inhibitor and / or a polysorbate material; the anti-wear lubricant comprises at least one of trimethylolpropane oleate, castor oil or turpentine. The methanol fuel additive obtained by matching the components and the methanol fuel containing the methanol fuel additive have excellent low-temperature performance, good wear resistance and lubricity, good metal corrosion inhibition, good rubber swelling resistance, good cleaning and dispersing performance and good environmental protection performance.

Description

Technical Field

[0001] The present invention relates to the technical field of fuels and additives, and in particular to a methanol fuel additive and methanol fuel. Background Art

[0002] In recent years, with rapid economic development, automobile use has continued to grow rapidly, resulting in significant environmental pollution. Methanol, like gasoline and diesel, is a liquid at room temperature and pressure, making it easy to transport and refuel. As a new energy alternative to traditional fossil fuels, it has gained widespread recognition for its safety, stability, high combustion efficiency, and low emissions. The use of methanol fuel in gasoline engines has evolved from a low methanol blend of 15% (M15) to higher methanol blends of 85-100% (M85-M100) in the late 1980s, a challenging process. With the increasing popularity of automobiles, the growing oil shortage, the sharp rise in refined oil prices, and increasing environmental pressures, research and development of petroleum alternatives has become a hot topic in recent years.

[0003] However, due to its inherent properties, methanol, when used as an alternative fuel, often exhibits issues such as rubber swelling and metal corrosion, poor low-temperature starting performance, poor anti-wear and lubricity, and toxicity. In particular, unconventional emissions generate small amounts of formaldehyde and formic acid, which significantly impact the environment and human health. Formaldehyde is irritating to the skin, eyes, and mucous membranes and is carcinogenic; formic acid can corrode certain metal and rubber parts in vehicles. The M100 methanol fuel additive currently available on the market only modifies the basic properties of methanol fuel, such as swelling, corrosion, and lubricity, with little improvement in low-temperature performance or unconventional emissions. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a methanol fuel additive and methanol fuel. The methanol fuel additive provided by the present invention can effectively improve the low-temperature ignition performance of methanol fuel, make the methanol fuel burn more fully, greatly reduce the amount of formic acid and formaldehyde in unconventional emissions, and make it more environmentally friendly.

[0005] In a first aspect, the present invention provides a methanol fuel additive, wherein the components of the methanol fuel additive include, by weight: 2-8 parts by weight of metal corrosion inhibitor, 25-35 parts by weight of anti-wear lubricant, 30-40 parts by weight of detergent dispersant, 4-10 parts by weight of antioxidant, 20-40 parts by weight of solvent, 3-8 parts by weight of auxiliary additives, wherein: The metal corrosion inhibitor is selected from imidazoline metal corrosion inhibitors and / or polysorbate materials, and the anti-wear lubricant includes at least one of trimethylolpropane oleate, castor oil or turpentine.

[0006] As a preferred technical solution of the present invention, the metal corrosion inhibitor is a combination of oleic acid imidazoline and Tween 80.

[0007] As a preferred technical solution of the present invention, the mass ratio of the oleic acid imidazoline to Tween 80 is (1-5):(1-3).

[0008] As a preferred technical solution of the present invention, the anti-wear lubricant is trimethylolpropane oleate.

[0009] As a preferred technical solution of the present invention, the detergent dispersant is selected from polyetheramine compounds.

[0010] As a preferred technical solution of the present invention, the solvent is selected from ethylene glycol monobutyl ether and / or diethylene glycol monobutyl ether.

[0011] As a preferred technical solution of the present invention, the polyetheramine compound is selected from polyetheramine-1000.

[0012] As a preferred technical solution of the present invention, the solvent is selected from ethylene glycol monobutyl ether.

[0013] As a preferred technical solution of the present invention, the antioxidant is selected from a combination of T551 and T502A.

[0014] As a preferred technical solution of the present invention, the auxiliary additive is selected from a combination of triethanolamine oleic acid soap and oleic acid.

[0015] As a preferred technical solution of the present invention, the mass ratio of T551 to T502A is (3-6):(1-4).

[0016] As a preferred technical solution of the present invention, the mass ratio of the triethanolamine oleic acid soap and oleic acid is (2-5):(1-3).

[0017] In a second aspect, the present invention provides a method for preparing the methanol fuel additive according to the first aspect, the preparation method comprising: The methanol fuel additive is obtained by mixing a metal corrosion inhibitor, an anti-wear lubricant, a detergent dispersant, an antioxidant, a solvent and auxiliary additives in a formulated amount.

[0018] In a third aspect, the present invention provides a methanol fuel comprising the methanol fuel additive described in the first aspect.

[0019] As a preferred technical solution of the present invention, the mass percentage of the methanol fuel additive in the methanol fuel is 0.1-0.5%.

[0020] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art: (1) The methanol fuel additive obtained by combining the components of the present invention and the methanol fuel containing the additive have excellent low-temperature performance, good anti-wear and lubricity, metal corrosion inhibition, rubber swelling resistance and clean dispersibility; (2) The methanol fuel additive provided by the present invention is applied to methanol fuel, which can effectively improve the low-temperature ignition performance of methanol fuel, make the fuel burn more fully, and can greatly reduce the emissions of formic acid, formaldehyde, CO, HC, CO2, etc. in the tail gas, effectively improving the economy of methanol fuel; (3) The methanol fuel additive provided by the present invention does not contain halogen, S, P and metal compounds, and is more energy-saving, environmentally friendly, green and healthy, and has low cost. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Currently, existing methanol fuel additives only change the basic properties of methanol fuel, such as swelling, corrosion, and lubrication, and have little effect on low-temperature performance and unconventional emissions. Therefore, the present invention provides a methanol fuel additive that can effectively improve the low-temperature ignition performance of methanol fuel, make the fuel burn more fully, and thereby reduce the amount of formic acid and formaldehyde in unconventional emissions; and also has a relatively good improvement effect on the basic properties of methanol fuel, such as swelling, corrosion, and lubrication.

[0024] In a first aspect, the present invention provides a methanol fuel additive, wherein the components of the methanol fuel additive include, by weight: 2-8 parts by weight of metal corrosion inhibitor, 25-35 parts by weight of anti-wear lubricant, 30-40 parts by weight of detergent dispersant, 4-10 parts by weight of antioxidant, 20-40 parts by weight of solvent, 3-8 parts by weight of auxiliary additives, wherein: The metal corrosion inhibitor is selected from imidazoline metal corrosion inhibitors and / or polysorbate materials, and the anti-wear lubricant includes at least one of trimethylolpropane oleate, castor oil or turpentine.

[0025] The metal corrosion inhibitor of 2-8 parts by weight can be 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, etc. The anti-wear lubricant of 25-35 parts by weight can be 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, etc. The detergent dispersant of 30-40 parts by weight can be 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, etc. 4 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, etc., the antioxidant 4-10 parts by weight can be 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, etc., the solvent 20-40 parts by weight can be 20 parts by weight, 22 parts by weight, 25 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 35 parts by weight, 38 parts by weight, 40 parts by weight, etc., the auxiliary additive 3-8 parts by weight can be 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, etc.

[0026] The components of the methanol fuel additive are explained in detail below.

[0027] In the present invention, the metal corrosion inhibitor is a combination of a liquid ashless imidazole metal corrosion inhibitor and a polysorbate material, preferably a combination of oleic acid imidazoline and Tween 80.

[0028] In the present invention, by introducing oleic acid imidazoline and Tween 80, oleic acid imidazoline has good anti-rust performance. The oleic acid imidazoline cooperates with Tween 80 and utilizes an adsorption film-forming mechanism to improve the dispersibility and permeability of oleic acid imidazoline in an acidic medium, and further increase its anti-rust ability, thereby effectively preventing the problem that oil pumps and oil floats are easily damaged due to the use of methanol fuel.

[0029] In the present invention, oleic acid imidazoline and Tween 80 are used in combination, which has excellent anti-wear, anti-oxidation, anti-rust, anti-corrosion and other effects, has good compatibility with other components, has a synergistic effect, and can effectively improve the corrosion resistance, high-temperature anti-wear lubricity and anti-oxidation problems of methanol fuel.

[0030] Moreover, the oleic acid imidazoline selected in the present invention is a green and environmentally friendly material, which can be decomposed and can reduce the pollution to the environment as much as possible.

[0031] As a preferred technical solution of the present invention, the mass ratio of the oleic acid imidazoline and Tween 80 is (1-5): (1-3), the 1-5 can be 1, 2, 3, 4, 5, etc., and the 1-3 can be 1, 1.5, 2, 2.5, 3, etc.

[0032] As a preferred technical solution of the present invention, the oleic acid imidazoline 1-5 parts by weight can be 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, etc., and the Tween 80 1-3 parts by weight can be 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, etc.

[0033] When oleic acid imidazoline and Tween 80 are mixed in the above ratio, it has a good corrosion inhibition effect on metals such as copper, aluminum, and tin. The corrosion inhibition effect can reach more than 95%, providing better protection for the engine fuel system and engine combustion system.

[0034] In the present invention, the anti-wear lubricant is selected from at least one of trimethylolpropane oleate, castor oil or turpentine, preferably trimethylolpropane oleate.

[0035] The preferred trimethylolpropane oleate of the present invention is a green and environmentally friendly anti-wear lubricant. It easily adsorbs onto metal surfaces to form a strong lubricating film, exhibiting excellent anti-wear and lubricity. This improves the anti-wear and lubricity of methanol fuel, reduces friction, and ensures the safety of automotive engines and oil pumps. Furthermore, its excellent lubricity enhances the low-temperature ignition performance of methanol fuel, ensuring more complete fuel combustion.

[0036] The preferred trimethylolpropane oleate of the present invention is used in combination with a metal corrosion inhibitor, which can effectively reduce the wear problem of the fuel injector and greatly reduce the harm caused by the electrochemical reaction of methanol, ensure the normal operation of the fuel pump and the fuel injector, and extend the service life of the fuel pump and the fuel injector.

[0037] In the present invention, the detergent dispersant is selected from polyetheramine compounds, preferably polyetheramine PEA-1000. The preferred polyetheramine compound of the present invention has good cleaning, dispersing, demulsification, sustained release, antioxidant and other properties, can inhibit the formation of deposits in automobile fuel injectors, intake valves and combustion chambers, and can also remove carbon deposits in automobile engine fuel nozzles.

[0038] The preferred detergent dispersant of the present invention is used in combination with auxiliary additives to effectively inhibit the formation of carbon deposits in the engine fuel system, improve engine performance, and reduce tail gas emission pollution.

[0039] In the present invention, the antioxidant is selected from a combination of the extremely alkaline T551 and the mixed phenol liquid antioxidant T502A. Preferably, the mass ratio of the T551 and T502A is (3-6): (1-4), and the 3-6 can be 3, 3.5, 4, 4.5, 5, 5.5, 6, etc., and the 1-4 can be 1, 1.5, 2, 2.5, 3, 3.5, 4, etc. Preferably, the T551 is 3-6 parts by weight, for example, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, 6 parts by weight, etc., and preferably, the T502A is 1-4 parts by weight, for example, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, etc.

[0040] The preferred T551 and T502A of the present invention are used in combination to produce an excellent synergistic effect, exhibiting superior antioxidant properties, inhibiting metal oxidation, and providing excellent swelling and anti-aging effects on rubber. They can effectively improve the rubber's swelling resistance and antioxidant properties, extending its durability. They can also ensure the stability of the vehicle's fuel supply system, reduce oil line failures, and ensure driving safety. Furthermore, they can form chelates with metal ions, forming an inert film on metal surfaces, further reducing the corrosion of metals caused by methanol fuel.

[0041] In the present invention, the solvent is selected from ethylene glycol monobutyl ether and / or diethylene glycol monobutyl ether, preferably ethylene glycol monobutyl ether. In summer, diethylene glycol monobutyl ether with high viscosity is selected, while in winter, ethylene glycol monobutyl ether with low viscosity is selected for better effect.

[0042] The preferred solvent of the present invention has excellent dissolving ability and good compatibility with other components, can effectively improve the calorific value of methanol fuel, make it burn fully, and solve the gas blockage problem.

[0043] In the present invention, the auxiliary additive is selected from a combination of triethanolamine oleic acid soap and oleic acid, and preferably the mass ratio of the triethanolamine oleic acid soap and oleic acid is (2-5): (1-3), wherein the 2-5 can be 2, 2.5, 3, 3.5, 4, 4.5, 5, etc., and the 1-3 can be 1, 1.5, 2, 2.5, 3, etc.

[0044] As a preferred technical solution of the present invention, the triethanolamine oleic acid soap is 2-5 parts by weight, for example, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, etc.; the oleic acid is 1-3 parts by weight, for example, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, etc.

[0045] The preferred triethanolamine oleic acid soap of the present invention has metal cleaning, rust prevention, lubrication, emulsification and other properties, and can also improve anti-explosion performance and prevent gas blockage. The preferred oleic acid can be used as a lubricating auxiliary emulsifier, mainly playing the role of low-temperature antifreeze, combustion support and cold start.

[0046] As a preferred technical solution of the present invention, the total weight of the methanol fuel additive is 100 parts by weight.

[0047] The methanol fuel additive obtained by combining the above components and the methanol fuel containing the same in the present invention have excellent low-temperature performance, good anti-wear and lubricity, metal corrosion inhibition, rubber swelling resistance and clean dispersibility, and can effectively solve the problems of metal corrosion and rubber swelling encountered in the actual use of methanol fuel (especially M100 methanol fuel), so that the methanol fuel has excellent corrosion resistance, high-temperature anti-wear and lubricity, clean dispersibility, oxidation resistance, rubber swelling resistance, etc., and also improves the low-temperature ignition performance and fuel economy of the methanol fuel, makes the methanol fuel burn more completely, effectively reduces the content of unburned hydrocarbons, CO, unburned methanol, formaldehyde and formic acid in exhaust emissions, and makes the methanol fuel safer and more environmentally friendly.

[0048] Moreover, the methanol fuel additive and the methanol fuel containing the same provided by the present invention have low use costs, can reduce carbon emissions by more than 80% compared with burning gasoline, and have good economic and social benefits.

[0049] In a second aspect, the present invention provides a method for preparing the methanol fuel additive according to the first aspect, the preparation method comprising: The methanol fuel additive is obtained by mixing a metal corrosion inhibitor, an anti-wear lubricant, a detergent dispersant, an antioxidant, a solvent and auxiliary additives in a formulated amount.

[0050] In a third aspect, the present invention provides a methanol fuel comprising the methanol fuel additive described in the first aspect.

[0051] As a preferred technical solution of the present invention, the mass percentage of the methanol fuel additive in the methanol fuel is 0.1-0.5%, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc.

[0052] The following is explained through specific examples: If no specific techniques or conditions are specified in the examples, the experiments were carried out according to conventional techniques or conditions in the art, or those described in the literature, or in the product specifications. Raw materials or instruments used without manufacturer specified are all commercially available conventional products.

[0053] In the following examples, the brand of oleic acid imidazoline is T703, the anti-wear lubricant is trimethylolpropane oleate TMPTO, and the brand of detergent dispersant is PEA-1000.

[0054] Examples 1-5 This embodiment provides a methanol fuel additive with a total weight of 100 parts by weight. The specific composition is shown in Table 1.

[0055] Table 1

[0056] Comparative Examples 1-12 This comparative example provides a methanol fuel additive with a total weight of 100 parts by weight. The specific composition is shown in Table 1 and Table 2.

[0057] Table 2

[0058] Application Examples and Comparative Application Examples This application example provides a methanol fuel containing 0.1-0.5 wt% of the methanol fuel additive provided in the embodiment, wherein: Application Example 1-1 contains 0.1 wt% of the methanol fuel additive provided in Example 1; Application Example 1-2 contains 0.2 wt% of the methanol fuel additive provided in Example 1; Application Examples 1-3 contain 0.5 wt% of the methanol fuel additive provided in Example 1; The remaining application examples and comparative application examples all contain 0.5 wt% methanol fuel additive.

[0059] Performance Testing (1) Performance tests were conducted on the methanol fuel additives provided in the examples and comparative examples, and the methanol fuels provided in the application examples and comparative examples. The technical indicators are shown in Tables 3 and 4: Table 3 (Technical Specifications of M100 Automotive Methanol Fuel Additive)

[0060] Table 4

[0061] Here are the results: (1) The methanol fuel provided by the present invention has been tested on an engine bench and its quality meets the national M100 methanol fuel standard for vehicles; (2) The methanol fuel provided by the present invention has been tested and its quality can meet the national unleaded gasoline standards, with an octane number of more than 100; (3) In terms of performance, after testing by the inspection and assessment center, its performance and vehicle engine operating performance were not affected and it can be used normally. The acceleration performance of 95 gasoline is good, and the emissions are lower than unleaded gasoline, reducing carbon emissions by more than 80%.

[0062] From the above performance tests, it can be seen that the methanol fuel provided by the present invention has a high octane number, strong explosive power, and extremely low lead content, sulfur content, and benzene content. It is particularly friendly to the environment and has excellent power, environmental protection, economy and practicality. It can solve the technical difficulties existing in the methanol fuel on the current market and has great promotion value.

[0063] (2) Comparisons were made between the methanol fuel provided in Application Examples 1-3, methanol, and commercially available methanol fuel. The results are shown in Table 5: Table 5

[0064] (3) The anti-wear and lubricity of the M100 methanol fuel provided in the corresponding use case and comparative application example were tested using a high-frequency reciprocating test machine, and its detergency and dispersibility were tested using a gasoline intake valve deposit simulation test method, and the rust marks and degree of rust on the aluminum sheet were observed; The test results are as follows: Comparison between Application Example 1 and Application Example 1 shows that the metal corrosion increases by 12%; Comparison between Application Example 2 and Application Example 1 shows that the metal corrosion increases by 15%; Comparing Application Example 3 with Application Example 2, the metal corrosion increased by 16%; Comparing Application Example 4 with Application Example 2, the metal corrosion increased by 18%. Comparing Application Example 5 with Application Example 3, the metal corrosion increased by 22%; Comparing Application Example 6 with Application Example 3, the metal corrosion increased by 56%. Comparing Application Example 7 with Application Example 4, the metal corrosion increased by 32%; Comparing Application Example 8 with Application Example 4, the metal corrosion increased by 68%; Comparison between Application Example 9 and Application Example 5 shows that the cold start is from -10℃ to -5℃. Comparison between Application Example 10 and Application Example 5 shows that the cold start is from -15℃ to -8℃. Comparative Application Example 11 and Application Example 6 were tested and compared, and the cold start was from -18°C to -6°C. Comparative Application Example 12 and Application Example 1 were tested and compared, and the cold start was from -20°C to -5°C.

[0065] Performance tests show that the methanol fuel provided by the present invention has excellent corrosion resistance, high-temperature anti-wear lubricity, cleanliness and dispersibility, oxidation resistance, and rubber swelling resistance, and has excellent low-temperature ignition performance and fuel economy. The methanol fuel burns more fully, effectively reducing the content of unburned hydrocarbons, CO, unburned methanol, formaldehyde, and formic acid in exhaust emissions, making the methanol fuel safer and more environmentally friendly.

[0066] From the comparison between the application examples and the comparison between the application examples and the comparative application examples, it can be seen that the components defined in the present invention cooperate with each other and are indispensable.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0068] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. 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 the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A methanol fuel additive, characterized in that: The components of the methanol fuel additive include, by weight: 2-8 parts by weight of metal corrosion inhibitor, 25-35 parts by weight of anti-wear lubricant, 30-40 parts by weight of detergent dispersant, 4-10 parts by weight of antioxidant, 20-40 parts by weight of solvent, 3-8 parts by weight of auxiliary additives, wherein: The metal corrosion inhibitor is selected from imidazoline metal corrosion inhibitors and / or polysorbate materials, and the anti-wear lubricant includes at least one of trimethylolpropane oleate, castor oil or turpentine.

2. The methanol fuel additive according to claim 1, characterized in that The metal corrosion inhibitor is a combination of oleic acid imidazoline and Tween 80; And / or, the anti-wear lubricant is trimethylolpropane oleate.

3. The methanol fuel additive according to claim 2, characterized in that: The mass ratio of the oleic acid imidazoline to Tween 80 is (1-5):(1-3).

4. The methanol fuel additive according to claim 1, characterized in that The cleaning dispersant is selected from polyetheramine compounds; And / or, the solvent is selected from ethylene glycol monobutyl ether and / or diethylene glycol monobutyl ether.

5. The methanol fuel additive according to claim 4, characterized in that The polyetheramine compound is selected from polyetheramine-1000; And / or, the solvent is selected from ethylene glycol monobutyl ether.

6. The methanol fuel additive according to claim 1, characterized in that The antioxidant is selected from the combination of T551 and T502A; And / or, the auxiliary additive is selected from a combination of triethanolamine oleic acid soap and oleic acid.

7. The methanol fuel additive according to claim 6, characterized in that The mass ratio of T551 to T502A is (3-6):(1-4); And / or, the mass ratio of the triethanolamine oleic acid soap to oleic acid is (2-5):(1-3).

8. A method for preparing the methanol fuel additive according to any one of claims 1 to 7, characterized in that: The preparation method comprises: The methanol fuel additive is obtained by mixing a metal corrosion inhibitor, an anti-wear lubricant, a detergent dispersant, an antioxidant, a solvent and auxiliary additives in a formulated amount.

9. A methanol fuel, characterized in that: The methanol fuel additive comprises the methanol fuel additive according to any one of claims 1 to 7.

10. The methanol fuel according to claim 9, characterized in that: The mass percentage of the methanol fuel additive in the methanol fuel is 0.1-0.5%.

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