A combustion chamber foam cleaner and its preparation method

Abstract

This invention relates to the field of cleaning agents, and particularly to a combustion chamber foam cleaner and its preparation method. The combustion chamber foam cleaner, by weight percentage, comprises: 10-15% composite activator, 2-5% auxiliary additives, 1.5-2.5% organic alkali, 3-5% penetrating agent, 3-5% composite corrosion inhibitor, 0.2-0.4% thickener, 8-12% propellant, and deionized water to bring the balance to 100%. This invention provides a highly efficient, safe, and engine-friendly combustion chamber foam cleaner. Its formulation, through the synergistic effect of its components, can efficiently remove stubborn carbon deposits while comprehensively protecting various metal materials and rubber seals within the combustion chamber, fundamentally avoiding the corrosion and aging risks that may arise during the cleaning process. The unique foam system ensures that the cleaning fluid can adhere to and penetrate the carbon deposits for a long time, thereby improving the uniformity and thoroughness of the cleaning.

Description

Technical Field

[0001] This invention relates to the field of cleaning agents, and in particular to a combustion chamber foam cleaning agent and its preparation method. Background Technology

[0002] During long-term engine operation, stubborn stains such as carbon soot, oil sludge, and unburned deposits easily accumulate on the inner walls of the combustion chamber, piston tops, and valves. These carbon deposits not only reduce the engine's compression ratio and affect air-fuel mixing efficiency, but can also cause a series of problems such as knocking, reduced power, increased fuel consumption, and worsened exhaust emissions. Therefore, regular cleaning and maintenance of the combustion chamber is an important technical means to maintain engine performance and extend its service life.

[0003] Currently, combustion chamber cleaning technologies mainly include disassembly cleaning, fuel additive cleaning, and professional cleaning equipment cleaning. While disassembly cleaning is thorough, it is complex, time-consuming, labor-intensive, and requires high-level assembly skills, making it unsuitable for routine or quick maintenance. Cleaning agents added directly to the fuel have a short residence time and limited concentration within the combustion chamber, often proving insufficient for cleaning thick, existing carbon deposits. In contrast, foam cleaning technology, developed in recent years, uses specialized equipment to inject cleaning agents in foam form into the stationary combustion chamber. This allows the foam to adhere to and wet the carbon deposits for an extended period, softening and removing the stains through penetration, dissolution, and emulsification. This method is relatively simple to operate and offers a more direct effect.

[0004] Existing foam cleaning agent formulations are mostly based on organic solvents, surfactants, and a small amount of water. While these formulations have some dissolving ability for greases, their reliance on organic solvents alone limits their ability to penetrate and decompose hard carbon deposits formed by high-temperature pyrolysis, resulting in uneven cleaning effects. Furthermore, some organic solvents are highly volatile, posing safety risks in the confined space of a combustion chamber, and their residues, if entering the engine oil system, may affect lubrication performance. Moreover, some strongly acidic or alkaline formulations, while possessing strong carbon removal capabilities, can easily cause potential corrosion or aging damage. Finally, some formulations exhibit poor foaming properties and stability, resulting in a short foam residence time on the carbon deposit surface, failing to fully exert wetting and reaction effects, thus impacting cleaning efficiency.

[0005] In summary, existing combustion chamber foam cleaning technologies and related formulations still have room for improvement in terms of cleaning efficiency, material compatibility, operational safety, and environmental friendliness. Summary of the Invention

[0006] The purpose of this invention application is to provide a cleaning agent that can efficiently, safely, and uniformly remove various types of carbon deposits, while significantly reducing damage to engine components and having stable foam properties.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of this invention provides a combustion chamber foam cleaner, which, by 100% by mass, comprises: 10-15% composite activator, 2-5% auxiliary agent, 1.5-2.5% organic alkali, 3-5% penetration aid, 3-5% composite corrosion inhibitor, 0.2-0.4% thickener, 8-12% propellant, and deionized water to make up the balance to 100%.

[0008] In a preferred embodiment, the ratio of the composite activator, the auxiliary agent and the composite corrosion inhibitor is (11~13):(2.5~4.5):(3.5~4.5).

[0009] In a more preferred embodiment, the ratio of the composite activator, the auxiliary combination agent and the composite corrosion inhibitor is (11~12):(3~4):(4~4.5).

[0010] In a preferred embodiment, the composite activator is a combination of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside, and cocamidopropyl betaine.

[0011] In a preferred embodiment, the mass ratio of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside and cocamidopropyl betaine is (5~6):(3~4):(2~2.5).

[0012] A more preferred embodiment is that the mass ratio of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside and cocamidopropyl betaine is (5.2~5.6):(3.3~3.6):(2.2~2.4).

[0013] In a preferred embodiment, the auxiliary agent is a combination of ethylene glycol butyl ether and sodium tannin.

[0014] In a preferred embodiment, the mass ratio of ethylene glycol butyl ether to sodium tannin is (1~2):(1~2).

[0015] In a more preferred embodiment, the mass ratio of ethylene glycol butyl ether to sodium tannin is (1.5~2):(1~1.4).

[0016] The addition of the aforementioned auxiliary agents comprehensively enhances the overall performance of the foam cleaning agent. Ethylene glycol butyl ether, as a highly efficient penetrant, significantly reduces the surface tension of the cleaning solution, allowing it to quickly wet and penetrate the microporous structure and interlayer of carbon deposits. The added sodium tannate functions stably in alkaline media; its polyphenolic structure can adsorb onto the metal surface through complexation, synergistically enhancing the anti-corrosion film with the composite corrosion inhibitor. Furthermore, it moderately improves the viscoelasticity and drainage stability of the foam film. The combination of these two agents achieves deeper removal of stubborn carbon deposits while providing additional material protection and ensuring foam durability during the cleaning process.

[0017] In a preferred embodiment, the organic base is at least one selected from monoethanolamine, diethanolamine, triethanolamine, ammonia, and potassium hydroxide.

[0018] In a more preferred embodiment, the organic base is monoethanolamine or diethanolamine.

[0019] In a more preferred embodiment, the organic base is monoethanolamine.

[0020] In a preferred embodiment, the penetration aid is at least one selected from diethylene glycol butyl ether, propylene glycol methyl ether, n-butanol, and isopropanol.

[0021] In a more preferred embodiment, the penetration aid is diethylene glycol butyl ether or propylene glycol methyl ether.

[0022] A more preferred embodiment is that the penetration aid is diethylene glycol butyl ether.

[0023] In a preferred embodiment, the composite corrosion inhibitor is a combination of sodium molybdate, benzotriazole, and triethanolamine borate.

[0024] In a preferred embodiment, the mass ratio of sodium molybdate, benzotriazole, and triethanolamine borate is (1~1.5):(1~1.5):(0.6~1).

[0025] A more preferred embodiment is that the mass ratio of sodium molybdate, benzotriazole and triethanolamine borate is (1.2~1.5):(1.1~1.3):(0.8~1).

[0026] The composite surfactant and composite corrosion inhibitor scheme adopted in this application can generate rich and long-lasting foam, effectively spreading the cleaning fluid evenly and allowing it to remain on the complex surface of the combustion chamber for an extended period. Its multiple functions enhance the wetting, penetration, and stripping ability of oil stains and carbon deposits. The composite corrosion inhibitor forms a dense, multifunctional protective film on the metal surface, effectively preventing the cleaning agent and reaction products from corroding the metal substrate. Furthermore, their combined action promotes the efficient and uniform cleaning reaction of the surfactant, achieving powerful cleaning while causing no damage to the core engine components.

[0027] In a preferred embodiment, the thickener is at least one selected from xanthan gum, guar gum, hydroxyethyl cellulose, polyvinylpyrrolidone, and magnesium aluminum silicate.

[0028] In a more preferred embodiment, the thickener is xanthan gum, guar gum, or hydroxyethyl cellulose.

[0029] A more preferred embodiment is that the thickener is hydroxyethyl cellulose.

[0030] In a preferred embodiment, the propellant is liquefied dimethyl ether or liquefied petroleum gas.

[0031] A more preferred embodiment is that the propellant is liquefied petroleum gas.

[0032] The second aspect of this invention provides a method for preparing the above-mentioned combustion chamber foam cleaning agent, specifically including the following steps: S1: Add a portion of the total amount of deionized water to a mixing vessel, add a thickener while continuously stirring and raise the temperature, stirring until a uniform viscous aqueous solution is formed; S2: After cooling, continue stirring and add a composite active agent to ensure complete dissolution and dispersion, then add an auxiliary combination agent, stirring thoroughly as well; S3: Then add an organic base, a penetrating agent and a composite corrosion inhibitor in sequence, stirring continuously and evenly each time they are added, finally rinsing the feed port with the remaining deionized water and adding it to the vessel, replenishing the total water volume, increasing the stirring speed to 200~250 rpm and homogenizing for 40~50 min, after which it is naturally cooled to room temperature, filtered through a 300-mesh stainless steel filter to obtain the stock solution, mix the stock solution with the propellant and fill it into a pressure-resistant aerosol can, seal and check for leaks to obtain the final product.

[0033] A more preferred embodiment, the preparation method of the combustion chamber foam cleaner specifically includes the following steps: S1: Add 70-80 wt% of deionized water to a mixing vessel, continuously stir at 100-150 rpm, add a thickener during this period and raise the temperature to 45-50°C, stir for 30-40 min until a uniform viscous aqueous solution is formed; S2: Lower the temperature to 40-42°C, continue stirring and add the composite active agent, continue stirring for 10-15 min after addition to ensure complete dissolution and dispersion before adding the auxiliary components. Mix the agent and stir for 10-15 minutes until fully incorporated; S3: Then add the organic alkali, penetrating agent and composite corrosion inhibitor in sequence, stirring continuously for 10-15 minutes each time. Finally, rinse the feed port with the remaining deionized water and add it to the reactor to make up the total water volume. Increase the stirring speed to 200-250 rpm and homogenize for 40-50 minutes. After completion, allow it to cool naturally to room temperature and filter it through a 300-mesh stainless steel filter to obtain the stock solution. Mix the stock solution with the propellant and fill it into a pressure-resistant aerosol can. After sealing and leak testing, the product is ready.

[0034] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. This invention provides a highly efficient, safe, and engine-friendly combustion chamber foam cleaner. Its formula, through the synergistic effect of its components, can efficiently remove stubborn carbon deposits while comprehensively protecting various metal materials and rubber seals within the combustion chamber, fundamentally avoiding the risks of corrosion and aging that may arise during the cleaning process. The unique foam system ensures that the cleaning fluid can adhere to and penetrate the carbon deposits for an extended period, thereby improving cleaning uniformity and thoroughness. Furthermore, this product uses water as a base and selects environmentally friendly propellants, significantly improving safety during use and storage, achieving an ideal balance between cleaning efficiency, material compatibility, and operational safety.

[0035] 2. In this invention application, the auxiliary agents ethylene glycol butyl ether and sodium tannate work together to enhance the overall performance of the cleaning agent. Ethylene glycol butyl ether, as a penetrant, effectively reduces surface tension, allowing the cleaning solution to quickly wet and penetrate the microporous structure of carbon deposits. Sodium tannate is stable in alkaline environments; its polyphenolic structure adsorbs onto the metal surface through complexation, synergistically strengthening the anti-corrosion film layer with the composite corrosion inhibitor, while also improving the viscoelasticity and stability of the foam film. The combination of these two agents achieves deeper removal of stubborn carbon deposits and provides additional material protection and foam durability for the cleaning process.

[0036] 3. The composite surfactant used in this invention application can generate abundant and long-lasting foam, allowing the cleaning fluid to spread evenly and remain on the complex surface of the combustion chamber for an extended period, thereby enhancing its ability to wet, penetrate, and remove oil stains and carbon deposits. The composite corrosion inhibitor forms a dense, multifunctional protective film on the metal surface, effectively blocking the corrosion of the cleaning agent and reaction products. The combined effect of both promotes efficient and uniform cleaning, ultimately achieving powerful cleaning while ensuring no damage to the core engine components. Detailed Implementation

[0037] Example 1 A combustion chamber foam cleaner, comprising, by weight percentage: 12% composite surfactant, 3.8% auxiliary additives, 2.1% organic alkali, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to bring the balance to 100%.

[0038] The composite surfactant is a combination of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside, and cocamidopropyl betaine in a mass ratio of 5.5:3.6:2.4. Sodium fatty alcohol polyoxyethylene ether sulfate was purchased from Erreke (Shandong) Chemical; alkyl glycoside 0810 was purchased from Shandong Jubang Chemical; and cocamidopropyl betaine CAB-35 was purchased from Shandong Jubang Chemical.

[0039] The auxiliary agent is a combination of ethylene glycol butyl ether and sodium tannin, with a mass ratio of 1.8:1.2.

[0040] The organic base is monoethanolamine; the penetrating agent is diethylene glycol butyl ether; the thickener is hydroxyethyl cellulose; and the propellant is liquefied petroleum gas. (Guangzhou Youbei Materials)

[0041] The composite corrosion inhibitor is a combination of sodium molybdate, benzotriazole and triethanolamine borate in a mass ratio of 1.2:1:0.8.

[0042] A method for preparing the above-mentioned combustion chamber foam cleaning agent specifically includes the following steps: S1: Add 70-80 wt% of deionized water to a mixing vessel, stir continuously at 120 rpm, add a thickener during the process and raise the temperature to 50°C, stir for 35 min until a uniform viscous aqueous solution is formed; S2: Lower the temperature to 40°C, continue stirring and add the composite activator, continue stirring for 12 min after addition to ensure complete dissolution and dispersion, then add the auxiliary combination agent, and stir for 15 min thoroughly; S3: Then add the organic base, penetrating aid and composite corrosion inhibitor in sequence, and continue stirring for 15 min each time, finally rinse the feed port with the remaining deionized water and add it to the vessel to make up the total water volume, increase the stirring speed to 240 rpm and homogenize for 50 min, after completion, allow it to cool naturally to room temperature, filter it with a 300-mesh stainless steel filter to obtain the stock solution, mix the stock solution with the propellant and fill it into a pressure-resistant aerosol can, seal and check for leaks to obtain the final product.

[0043] Example 2 A combustion chamber foam cleaner, comprising, by weight percentage: 11% composite activator, 4.2% auxiliary agent, 1.9% organic base, 3.8% penetrating agent, 3.8% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to make up the balance to 100%.

[0044] The composite surfactant is a combination of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside, and cocamidopropyl betaine in a mass ratio of 5.2:3.8:2.5. Sodium fatty alcohol polyoxyethylene ether sulfate was purchased from Erreke (Shandong) Chemical; alkyl glycoside 0810 was purchased from Shandong Jubang Chemical; and cocamidopropyl betaine CAB-35 was purchased from Shandong Jubang Chemical.

[0045] The auxiliary agent is a combination of ethylene glycol butyl ether and sodium tannin, with a mass ratio of 2:1.

[0046] The organic base is monoethanolamine; the penetrating agent is diethylene glycol butyl ether; the thickener is hydroxyethyl cellulose; and the propellant is liquefied petroleum gas. (Guangzhou Youbei Materials)

[0047] The composite corrosion inhibitor is a combination of sodium molybdate, benzotriazole and triethanolamine borate in a mass ratio of 1.2:1:0.8.

[0048] A method for preparing the above-mentioned combustion chamber foam cleaning agent specifically includes the following steps: S1: Add 70-80 wt% of deionized water to a mixing vessel, stir continuously at 120 rpm, add a thickener during the process and raise the temperature to 50°C, stir for 35 min until a uniform viscous aqueous solution is formed; S2: Lower the temperature to 40°C, continue stirring and add the composite activator, continue stirring for 12 min after addition to ensure complete dissolution and dispersion, then add the auxiliary combination agent, and stir for 15 min thoroughly; S3: Then add the organic base, penetrating aid and composite corrosion inhibitor in sequence, and continue stirring for 15 min each time, finally rinse the feed port with the remaining deionized water and add it to the vessel to make up the total water volume, increase the stirring speed to 240 rpm and homogenize for 50 min, after completion, allow it to cool naturally to room temperature, filter it with a 300-mesh stainless steel filter to obtain the stock solution, mix the stock solution with the propellant and fill it into a pressure-resistant aerosol can, seal and check for leaks to obtain the final product.

[0049] Example 3 A combustion chamber foam cleaner, comprising, by weight percentage: 12% composite activator, 3.8% auxiliary agent, 2.1% organic base, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to make up the balance to 100%.

[0050] The composite surfactant is a combination of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside, and cocamidopropyl betaine in a mass ratio of 6:3:2. Sodium fatty alcohol polyoxyethylene ether sulfate was purchased from Erreke (Shandong) Chemical; alkyl glycoside 0810 was purchased from Shandong Jubang Chemical; and cocamidopropyl betaine CAB-35 was purchased from Shandong Jubang Chemical.

[0051] The auxiliary agent is a combination of ethylene glycol butyl ether and sodium tannin, with a mass ratio of 1.6:1.4.

[0052] The organic base is monoethanolamine; the penetrating agent is diethylene glycol butyl ether; the thickener is hydroxyethyl cellulose; and the propellant is liquefied petroleum gas. (Guangzhou Youbei Materials)

[0053] The composite corrosion inhibitor is a combination of sodium molybdate, benzotriazole and triethanolamine borate in a mass ratio of 1.5:1.3:0.7.

[0054] A method for preparing the above-mentioned combustion chamber foam cleaning agent specifically includes the following steps: S1: Add 70-80 wt% of deionized water to a mixing vessel, stir continuously at 120 rpm, add a thickener during the process and raise the temperature to 50°C, stir for 35 min until a uniform viscous aqueous solution is formed; S2: Lower the temperature to 40°C, continue stirring and add the composite activator, continue stirring for 12 min after addition to ensure complete dissolution and dispersion, then add the auxiliary combination agent, and stir for 15 min thoroughly; S3: Then add the organic base, penetrating aid and composite corrosion inhibitor in sequence, and continue stirring for 15 min each time, finally rinse the feed port with the remaining deionized water and add it to the vessel to make up the total water volume, increase the stirring speed to 240 rpm and homogenize for 50 min, after completion, allow it to cool naturally to room temperature, filter it with a 300-mesh stainless steel filter to obtain the stock solution, mix the stock solution with the propellant and fill it into a pressure-resistant aerosol can, seal and check for leaks to obtain the final product.

[0055] Comparative Example 1 A combustion chamber foam cleaner, comprising, by weight percentage: 13% composite surfactant, 1.5% auxiliary additives, 2.1% organic alkali, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to bring the balance to 100%.

[0056] The remaining implementation methods are the same as in Example 1.

[0057] Comparative Example 2 A combustion chamber foam cleaner, comprising, by weight percentage: 12% composite activator, 3.8% auxiliary agent, 2.1% organic base, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to make up the balance to 100%.

[0058] The composite activator is a combination of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside and cocamidopropyl betaine in a mass ratio of 6.5:4.5:0.5.

[0059] The remaining implementation methods are the same as in Example 1.

[0060] Comparative Example 3 A combustion chamber foam cleaner, comprising, by weight percentage: 12% composite surfactant, 3.8% auxiliary additives, 2.1% organic alkali, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to bring the balance to 100%.

[0061] The composite activator is a combination of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside and cocamidopropyl betaine in a mass ratio of 7:1:3.5.

[0062] The remaining implementation methods are the same as in Example 1.

[0063] Comparative Example 4 A combustion chamber foam cleaner, comprising, by weight percentage: 12% composite surfactant, 3.8% auxiliary additives, 2.1% organic alkali, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to bring the balance to 100%.

[0064] The auxiliary agent is a combination of ethylene glycol butyl ether and sodium tannin, with a mass ratio of 2.5:0.5.

[0065] The remaining implementation methods are the same as in Example 1.

[0066] Comparative Example 5 A combustion chamber foam cleaner, comprising, by weight percentage: 12% composite surfactant, 3.8% auxiliary additives, 2.1% organic alkali, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to bring the balance to 100%.

[0067] The auxiliary agent is a combination of ethylene glycol butyl ether and sodium tannin, with a mass ratio of 0.8:2.2.

[0068] The remaining implementation methods are the same as in Example 1.

[0069] Comparative Example 6 A combustion chamber foam cleaner, comprising, by weight percentage: 12% composite surfactant, 3.8% auxiliary additives, 2.1% organic alkali, 3.6% penetrating agent, 4.1% composite corrosion inhibitor, 0.3% thickener, 10% propellant, and deionized water to bring the balance to 100%.

[0070] The composite corrosion inhibitor is a combination of sodium molybdate, benzotriazole and triethanolamine borate, with a mass ratio of 1.8:1:0.2.

[0071] The remaining implementation methods are the same as in Example 1.

[0072] Performance testing 1. Cleaning performance: The clean sample was immersed in high-temperature cracked lubricating oil and heated in a 300℃ oven for 2 hours to form a uniform and strongly adhered simulated carbon deposit layer. After cooling, the sample was weighed (W1). The sample was then suspended vertically and foam was sprayed evenly from a distance of 15cm using the product aerosol can to completely cover it. The sample was allowed to stand for 10 minutes at an ambient temperature of 25℃. The sample was then rinsed with deionized water for 10 seconds and dried in a 105℃ oven for 1 hour. After cooling, the sample was weighed (W2). The cleaning efficiency was calculated as (W1-W2) / initial carbon deposit mass × 100%. The average of 10 tests was recorded in Table 1.

[0073] 2. Storage stability: The sealed finished aerosol cans were divided into two batches and placed in a constant temperature chamber at 60±2℃ and a constant temperature chamber at 0℃ respectively for 28 days. After being taken out and restored to room temperature, their cleanliness was tested again. If the aerosol cans had no leakage or deformation and the decrease in cleaning efficiency was less than 5%, they were considered qualified; otherwise, they were considered unqualified. 100 samples were tested for each example and comparative example, and the sample qualification rate was recorded in Table 1.

[0074] 3. Corrosivity: Prepare a working solution by mixing the cleaning agent concentrate with deionized water at a volume ratio of 1:5. Completely immerse the LY12 aluminum alloy test piece in the working solution and place it in a constant temperature oven at 55℃ for 24 hours. Remove the test piece, gently wipe it with a soft cloth and deionized water, and observe whether there is obvious pitting, discoloration or loss of gloss on the surface. Then, after cooling in a desiccator, weigh it and calculate the weight loss per unit area. The results are the average of 10 tests and recorded in Table 1.

[0075] 4. Foam stability: Dilute the cleaning agent concentrate to a concentration of 5wt%, pour 200mL of the diluted solution into a special graduated cylinder, use a sand core disperser with a specific aperture, and pass air through at a constant flow rate for 5s at 25℃. Immediately record the maximum foam volume V0, i.e., the initial foam volume; record the time required for the foam volume to decrease by half V0 / 2 after the air passage is stopped. The results are recorded as the average of 10 tests and recorded in Table 1.

[0076] Table 1 Performance Test Results Test Result Analysis: Performance test results show that Examples 1-3 of this application, by employing specific technical solutions and auxiliary agents, effectively reduce surface tension, allowing the cleaning fluid to quickly wet and penetrate the microporous structure of carbon deposits. Furthermore, the composite surfactant generates rich and lasting foam, enabling the cleaning fluid to spread evenly and remain on the complex surface of the combustion chamber for an extended period, thereby enhancing its wetting, penetration, and stripping capabilities against oil and carbon deposits. Comparative Examples 1-6, however, employ different technical solutions than those of this application, resulting in a significant decrease in their respective technical effects and ultimately leading to overall product performance inferior to Examples 1-3.

[0077] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A combustion chamber foam cleaner, characterized in that: The raw materials, by 100% by weight, include: 10-15% composite surfactant, 2-5% auxiliary additives, 1.5-2.5% organic base, 3-5% penetrating agent, 3-5% composite corrosion inhibitor, 0.2-0.4% thickener, 8-12% propellant, and deionized water to make up the balance to 100%. The composite activator is a combination of sodium fatty alcohol polyoxyethylene ether sulfate, alkyl glycoside and cocamidopropyl betaine, in a mass ratio of (5~6):(3~4):(2~2.5). The auxiliary agent is a combination of ethylene glycol butyl ether and sodium tannin, with a mass ratio of (1~2):(1~2).

2. The combustion chamber foam cleaner according to claim 1, characterized in that: The ratio of the composite activator, auxiliary agent and composite corrosion inhibitor is (11~13):(2.5~4.5):(3.5~4.5).

3. The combustion chamber foam cleaner according to claim 2, characterized in that: The organic base is at least one of monoethanolamine, diethanolamine, triethanolamine, ammonia, and potassium hydroxide.

4. The combustion chamber foam cleaner according to claim 3, characterized in that: The penetration aid is at least one of diethylene glycol butyl ether, propylene glycol methyl ether, n-butanol, and isopropanol.

5. The combustion chamber foam cleaner according to claim 4, characterized in that: The composite corrosion inhibitor is a combination of sodium molybdate, benzotriazole and triethanolamine borate, with a mass ratio of (1~1.5):(1~1.5):(0.6~1).

6. The combustion chamber foam cleaner according to claim 5, characterized in that: The thickener is at least one of xanthan gum, guar gum, hydroxyethyl cellulose, polyvinylpyrrolidone, and magnesium aluminum silicate.

7. The combustion chamber foam cleaner according to claim 6, characterized in that: The propellant is liquefied dimethyl ether or liquefied petroleum gas.

8. The combustion chamber foam cleaner according to claim 7, characterized in that: The organic base is monoethanolamine or diethanolamine.

9. The combustion chamber foam cleaner according to claim 8, characterized in that: The penetration aid is diethylene glycol butyl ether or propylene glycol methyl ether.

10. A method for preparing a combustion chamber foam cleaner according to any one of claims 1 to 9, characterized in that: Specifically, the following steps are included: S1: Add a portion of the total amount of deionized water to the mixing vessel, add thickener while continuously stirring and raise the temperature, stirring until a uniform viscous aqueous solution is formed; S2: After cooling, continue stirring and add the composite activator to ensure complete dissolution and dispersion before adding the auxiliary combination agent, stirring thoroughly as well; S3: Then add the organic base, penetrating aid and composite corrosion inhibitor in sequence, stirring continuously and evenly each time, and finally rinse the feed port with the remaining deionized water and add it to the vessel to make up the total water volume, increase the stirring speed to 200~250 rpm and homogenize for 40~50 minutes, after which allow it to cool naturally to room temperature, filter it through a 300-mesh stainless steel filter to obtain the stock solution, mix the stock solution with the propellant and fill it into a pressure-resistant aerosol can, seal and check for leaks to obtain the final product.

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