A cleaning agent for cleaning the outside of the engine of a special vehicle in a yard and a method for preparing the same

Abstract

The present application provides an engine cleaner, the cleaner contains a surfactant, a cosolvent and water; wherein the surfactant is sodium diisooctyl sulfosuccinate and octadecyl amine polyoxyethylene ether, the cosolvent is N,N-dimethylacetamide; the mass ratio of sodium diisooctyl sulfosuccinate, octadecyl amine polyoxyethylene ether and N,N-dimethylacetamide is (1-5):(1-10):(1-16) based on the total weight of the cleaner. The cleaner has high penetration efficiency, can disperse heavy oil stains, does not need to be washed with a large amount of water during use, has short penetration time, does not produce flow stains, and does not pollute the apron in the apron use environment.

Description

Technical Field

[0001] This invention relates to the field of industrial equipment cleaning agents, specifically to an engine external cleaning agent and its preparation method. Background Technology

[0002] Passenger boarding stairs, passenger shuttle buses, baggage handling vehicles, and cargo lifting platforms are indispensable heavy equipment for ground operations support of civil aviation flights. These vehicles operate for extended periods in the tarmac environment. Busy flight operations force these high-value special vehicles to operate under heavy loads for long periods, leading to excessive wear and tear, oil buildup, and leaks. This seriously affects vehicle operation safety and can even cause serious accidents such as vehicle fires or collisions with aircraft. Due to the heavy workload of flight operations and the special structure of these vehicles, they cannot frequently enter and exit the tarmac to clean external engine oil stains. Taking the high-value cargo lifting platform vehicle on the apron as an example: (1) Due to the special air defense environment of the apron, there are high requirements for the cleanliness of the apron floor. Traditional engine external cleaners will cause a large amount of oil to drip onto the apron floor during the cleaning process, resulting in apron pollution. Airports usually impose heavy penalties on units that cause apron pollution, so conventional heavy oil cleaners cannot be used on the apron; (2) For high-value lifting platform vehicles, the journey between the repair shop and the apron is long each time. Due to its special structure, the rear wheels of the platform vehicle cannot travel on bumpy roads. Each round trip may cause the rear wheels to be scrapped. Therefore, the lifting platform vehicle generally does not leave the airside operation area except for major maintenance and other special reasons, thus becoming a major oil pollution disaster area in the cabin.

[0003] In the early days, limited by outdated chemical production technology, the external cleaning of engines for special vehicles on the tarmac mainly relied on solvents such as gasoline, diesel, and alcohol, which have similar chemical properties to the oil stains on the engine's exterior. However, this method was ineffective, costly, environmentally unfriendly, and prone to fire and even explosion hazards. Later, with the large-scale popularization of the alkali industry and the widespread application of industrial caustic soda, high-temperature alkaline solvents began to be used for cleaning engine oil stains. Strong alkaline cleaning agents, under high-temperature conditions, produce a strong emulsification effect with the oil stains on the engine's external surface, dissolving the oil stains in an aqueous solution, which is then removed by high-pressure water jets. However, this method is highly corrosive, easily damaging the engine's metal and rubber parts; it generates waste liquid that severely pollutes the environment, making it environmentally unfriendly; it has low cleaning efficiency, high energy consumption, and cannot clean complex parts.

[0004] In recent years, with the rapid development of the fine chemicals industry, specialized cleaning agents for various cleaning fields have been continuously enriched and improved, and a variety of external cleaning agents specifically for motor vehicle engines have also been launched. Engine external cleaning agents prepared by compounding multiple functional reagents possess characteristics such as strong detergency, high efficiency, environmental friendliness, and simple operation. After the compounded cleaning agent penetrates and emulsifies the grease, it can be rinsed with a high-pressure water gun to remove oil stains. However, most cleaning agents on the market require large amounts of water to rinse during use, resulting in oil stains that pollute the apron environment, affecting flight safety. This is time-consuming, labor-intensive, and costly, making it unsuitable for cleaning special vehicle engines in apron environments. For example, application number CN201610791126.4 provides "an engine external cleaning agent," but the cleaning agent prepared by this invention requires a large amount of water to rinse the stains during the cleaning process, generating a large amount of waste liquid that pollutes the ground.

[0005] Therefore, there is an urgent need to develop a special vehicle engine compartment cleaner based on the apron usage environment. Summary of the Invention

[0006] The present invention first provides an engine cleaner containing a surfactant, a co-solvent, and water; wherein the surfactant is sodium diisooctyl succinate sulfonate and octadecylamine polyoxyethylene ether, and the co-solvent is N,N-dimethylacetamide; the mass ratio of sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether, and N,N-dimethylacetamide, based on the total weight of the cleaner, is (1-5):(1-10):(1-16).

[0007] In one or more embodiments, the cleaning agent further comprises one or more of corrosion inhibitors, chelating agents, brighteners, and cleaning aids.

[0008] In one or more embodiments, the corrosion inhibitor is benzotriazole and / or mercaptobenzothiazole, the chelating agent is sodium hypotriacetate, the brightener is benzyl acetone, the cleaning aid is tetrasodium ethylenediaminetetraacetate, and the solvent is water.

[0009] In one or more embodiments, the cleaning agent contains sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether, and N,N-dimethylacetamide in a mass ratio of (1-5):(1-4):(1-6) based on the total weight of the cleaning agent, for example, 1:1:1, 1:2:3, 5:10:16, 1:2:4, 2:1:4, 2:3:6, 4:1:2, or 5:4:3.

[0010] In one or more embodiments, the total content of the surfactant in the detergent is 10-45 wt%, such as 10-40 wt%, 20-40 wt%, or 10-15 wt%, based on the total weight of the detergent; wherein the content of sodium diisooctyl succinate sulfonate is 4-20 wt%, such as 4.5-19 wt%, 5-18.5 wt%, or 9-18 wt%.

[0011] In one or more embodiments, the total content of the surfactant in the detergent is 10-15 wt%, such as 12-14 wt%, based on the total weight of the detergent; wherein the content of sodium diisooctyl succinate sulfonate is 4-10 wt%, such as 4.5-9.0 wt%.

[0012] In one or more embodiments, the total content of the surfactant in the detergent is 16-45 wt%, such as 18-40 wt%, based on the total weight of the detergent; wherein the mass of sodium diisooctyl succinate sulfonate is 10.0-20.0 wt%, such as 14.0-19.0 wt%.

[0013] In one or more embodiments, the co-solvent content in the cleaning agent is 5 wt% to 40 wt%, such as 9-36 wt%, 16-21 wt%, or 18-36 wt%, based on the total weight of the cleaning agent.

[0014] In one or more embodiments, the corrosion inhibitor is present in an amount of 0.5 wt% to 2 wt%, preferably 0.5 wt% to 1.5 wt%.

[0015] In one or more embodiments, the chelating agent is present in an amount of 1.0 wt% to 2.0 wt%, preferably 1.2 wt% to 1.5 wt%.

[0016] In one or more embodiments, the brightener content is 0.5wt%-6wt%, preferably 3wt%-5wt%.

[0017] In one or more embodiments, the cleaning aid is present in an amount of 0.5-1.5 wt%, preferably 0.6 wt%-1.0 wt%.

[0018] In one or more embodiments, the cleaning agent comprises, by total weight:

[0019] (I) Sodium diisooctyl succinate sulfonate 4.5–20.0 wt%.

[0020] Octadecylamine polyoxyethylene ether 3.0–20.0 wt%.

[0021] N,N-Dimethylacetamide 5–40.0 wt%.

[0022] Benzotriazole 0.5–1.5 wt%.

[0023] Sodium hypotriacetate 1.0–1.5 wt%,

[0024] 3.5–4.5 wt% benzyl acetone, and

[0025] Tetrasodium ethylenediaminetetraacetate 0.5–1 wt%; or

[0026] (II) Sodium diisooctyl succinate sulfonate 8.5–9.5 wt%,

[0027] Octadecylamine polyoxyethylene ether 4.0–5.0 wt%.

[0028] N,N-Dimethylacetamide 17.0–19.0 ​​wt%.

[0029] Benzotriazole 0.5–1.5 wt%.

[0030] Sodium hypotriacetate 1.0–1.5 wt%,

[0031] 3.5–4.5 wt% benzyl acetone, and

[0032] Tetrasodium ethylenediaminetetraacetate 0.5–1 wt%.

[0033] The present invention also provides a method for preparing a cleaning agent as described in any embodiment herein, the method comprising: first adding sodium diisooctyl succinate sulfonate and octadecylamine polyoxyethylene ether, mixing them evenly, and then adding N,N-dimethylacetamide and other ingredients.

[0034] Application of the cleaning agent described in any embodiment of this document in cleaning engines.

[0035] The present invention also provides a method for reducing the amount of water used for thorough cleaning with detergent and / or reducing the penetration time of detergent, wherein the detergent contains sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether, and N,N-dimethylacetamide.

[0036] In one or more embodiments, the cleaning agent has a cloud point of ≥90°C, preferably ≥92°C, and more preferably ≥95°C.

[0037] In one or more embodiments, the cleaning agent requires ≤1L of water for thorough cleaning, preferably ≤0.8L, and more preferably ≤0.5L.

[0038] In one or more embodiments, the penetration time of the cleaning agent is ≤2 min, preferably ≤1.5 min, and more preferably ≤1 min.

[0039] In one or more embodiments, the surface tension of the cleaning agent is ≤35mN / m, such as ≤30mN / m or ≤25mN / m. Detailed Implementation

[0040] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0041] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0042] In this document, the terms “contains,” “includes,” “containing,” and similar terms encompass the meanings of “basically composed of” and “composed of.” For example, when this document discloses “A contains B and C,” “A is basically composed of B and C” and “A is composed of B and C” should be considered as having been disclosed in this document.

[0043] In this document, all features defined in the form of numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0044] Unless otherwise specified, percentage refers to mass percentage, proportion refers to mass ratio, and part refers to mass part.

[0045] In this document, when describing embodiments or examples, it should be understood that it is not intended to limit the invention to those embodiments or examples. Rather, all alternatives, modifications, and equivalents of the methods and materials described herein are covered within the scope defined by the claims.

[0046] In this article, the sum of the percentages of all components in the composition is 100%.

[0047] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0048] Most existing cleaning agents containing nonionic surfactants require high-pressure water rinsing, resulting in a large water consumption and a significant amount of waste liquid, which is time-consuming and labor-intensive to treat. However, the inventors of this invention, through in-depth research, discovered that a compound of the anionic surfactant sodium diisooctyl succinate sulfonate (OT), the nonionic surfactant octadecylamine polyoxyethylene ether (PEG stearyl amine), and the organic co-solvent N,N-dimethylacetamide (DMAC) can effectively achieve a high cleaning rate. Under certain proportions, this compounded cleaning agent exhibits excellent cleaning performance. Furthermore, the cleaning agent of this invention possesses high penetration efficiency, can disperse heavy oil stains, requires no large amount of water rinsing during use, has a short penetration time, does not produce runners, and does not pollute the apron in the apron environment.

[0049] Engine cleaner

[0050] Engine cleaners typically include surfactants, cosolvents, optional additives, and solvents. This invention provides an engine cleaner comprising one or more of the following: a surfactant, a cosolvent, optional corrosion inhibitors, chelating agents, brighteners, cleaning aids, and solvents. The surfactant is sodium diisooctyl succinate sulfonate or octadecylamine polyoxyethylene ether, and the cosolvent is N,N-dimethylacetamide.

[0051] The sodium diisooctyl succinate used in this invention is a commonly used anionic surfactant in the art, possessing excellent detergency, penetration, and foaming power, resulting in superior overall cleaning performance. In the cleaning agent of this invention, the effective component of sodium diisooctyl succinate should be ≥50%, preferably ≥75%, and more preferably 100%. Based on the total weight of the cleaning agent, the mass of sodium diisooctyl succinate can be 3wt%-25wt%, preferably 4wt%-20wt%.

[0052] In some embodiments, the mass ratio of OT, PEG stearamide and DMAC in the cleaning agent of the present invention, based on the total weight of the cleaning agent, can be (1-5):(1-10):(1-16) or (1-5):(1-4):(1-6), such as 1:1:1, 1:2:3, 5:10:16, 1:2:4, 2:1:4, 2:3:6, 4:1:2 or 5:4:3.

[0053] In some embodiments, the total content of surfactants in the cleaning agent of the present invention is 10-45 wt% by total weight of the cleaning agent, such as 10-40 wt%, 20-40 wt%, or 10-15 wt%, wherein the content of OT can be 4-20 wt%, such as 4.5-19 wt%, 5-18.5 wt%, or 9-18 wt%.

[0054] In some embodiments, the total mass of surfactants in the cleaning agent of the present invention is 10-15 wt%, such as 12-14 wt%, based on the total weight of the cleaning agent, wherein the mass of OT can be 4-10 wt%, such as 4.5-9.0 wt%.

[0055] In some embodiments, the total mass of surfactants in the cleaning agent of the present invention is 16-45 wt%, such as 18-40 wt%, based on the total weight of the cleaning agent, wherein the mass of OT can be 10-20 wt%, such as 14-19 wt%.

[0056] In the cleaning agent of the present invention, N,N-dimethylacetamide is a cosolvent or degreasing agent, and its mass can be 5wt%-40wt%, such as 9-36wt%, 16-21wt%, or 18-36wt%, based on the total weight of the cleaning agent.

[0057] The corrosion inhibitors suitable for this invention are known in the art and can be benzotriazole, mercaptobenzothiazole, and preferably benzotriazole. Using benzotriazole as a corrosion inhibitor slows the corrosion rate of engine metal materials in the medium to zero, maintaining the original physical and chemical properties of the metal materials. The corrosion inhibitor comprises 0.5wt%-2wt%, preferably 0.5wt%-1.5wt%, based on the total weight of the cleaning agent.

[0058] The chelating agent suitable for this invention can be sodium hypotriacetate, which has strong dispersing and anti-redeposition abilities, significantly enhances the detergency of the cleaning agent, and is biodegradable and environmentally friendly. The chelating agent can be 1.0 wt%-2.0 wt%, preferably 1.2 wt%-1.5 wt%, based on the total weight of the cleaning agent.

[0059] The brightener suitable for use in this invention can be benzylidene acetone, which can improve the metallic luster and protect the outer surface of the metal engine. The content of the brightener in the cleaning agent can be adjusted according to actual needs. In this article, the content of the brightener, based on the total weight of the cleaning agent, can be 0.5wt%-6wt%, preferably 3wt%-5wt%.

[0060] The cleaning aids applicable to the present invention may also include any number of aids. Specifically, among any number of other ingredients that may be added to the composition, the cleaning composition may include stabilizers, wetting agents, foaming agents, biocides, and hydrogen peroxide. Such aids may be pre-formulated with the composition of the present invention, or may be added to the system simultaneously, or even after the addition of the composition of the present invention. The detergent composition may also contain any number of other ingredients as required for application, which are known to contribute to the activity of the composition of the present invention. In some embodiments, the cleaning aid may be tetrasodium EDTA, which can enhance the cleaning performance of anionic surfactants and improve the detergency of the product. The content of the cleaning aid may be adjusted as needed; herein, the content of the cleaning aid may be 0.5-1.5 wt%, preferably 0.6 wt%-1.0 wt%, based on the total weight of the detergent.

[0061] Deionized water is used as the base solvent. It should be understood that in the cleaning agents of this invention, the water is of the grade and hardness and grain level required for cleaning agents in the art. When using the cleaning agents of this invention, the cleaning agents in most application scenarios will include water, and the sum of the water content and the content of the above-mentioned components will be 100%.

[0062] In some embodiments, the cleaning agent of the present invention comprises, by total weight of the cleaning agent:

[0063] Sodium diisooctyl succinate sulfonate 4.5–20.0 wt%.

[0064] Octadecylamine polyoxyethylene ether 3.0–20.0 wt%.

[0065] N,N-Dimethylacetamide 5–40.0 wt%.

[0066] Benzotriazole 0.5–1.5 wt%.

[0067] Sodium hypotriacetate 1.0–1.5 wt%,

[0068] 3.5–4.5 wt% benzyl acetone, and

[0069] Tetrasodium ethylenediaminetetraacetate 0.5–1 wt%.

[0070] In some embodiments, the cleaning agent of the present invention comprises, by total weight of the cleaning agent:

[0071] Sodium diisooctyl succinate sulfonate 8.5–9.5 wt%,

[0072] Octadecylamine polyoxyethylene ether 4.0–5.0 wt%.

[0073] N,N-Dimethylacetamide 17.0–19.0 ​​wt%.

[0074] Benzotriazole 0.5–1.5 wt%.

[0075] Sodium hypotriacetate 1.0–1.5 wt%,

[0076] 3.5–4.5 wt% benzyl acetone, and

[0077] Tetrasodium ethylenediaminetetraacetate 0.5–1 wt%.

[0078] In some embodiments, the cleaning agent as described in any embodiment of the present invention can be diluted to form a solution. When diluted into a solution, the dilution can be performed as needed, for example, by a dilution factor of 3 to 50 times.

[0079] Preparation method

[0080] The preparation of engine cleaner includes steps such as heating, stirring, dissolving, and dispersing. This invention also provides a method for preparing a cleaner as described in any embodiment herein, comprising the following steps: first, adding solvent, OT, PEG stearylamine, and brightener to a container and stirring until completely dissolved; then adding DMAC, a chelating agent, and a cleaning aid; dispersing; and finally adding a corrosion inhibitor and dispersing to obtain the cleaner.

[0081] In this text, the container can be a commonly used apparatus for preparing cleaning agents, such as a reaction vessel. A stirring device can also be used to assist stirring, with a stirring rate of 600-800 r / min, and this stirring rate can be maintained constant during the addition process. The dispersion time can be adjusted according to the actual situation, aiming for uniform dispersion of the cleaning agent, and can be 5-30 min, for example, 10-15 min.

[0082] application

[0083] The engine cleaner solution system of this invention is stable, has strong penetrating power, and produces little waste liquid during cleaning. The low surface tension facilitates the penetration and fusion of the cleaner with oil stains and grease, reducing penetration time and significantly improving detergency and cleaning power. Nonionic surfactants change properties above their cloud point, affecting cleaning performance. Considering the high-temperature environment encountered during cleaning external oil stains on special vehicle engines, the cleaner of this invention has a high cloud point, meeting the oil stain cleaning performance requirements under high-temperature conditions. In this document, the amount of water used for thorough cleaning is measured by the amount of water required to thoroughly clean 50g of oil stains with 30mL of cleaner. The oil stain formulation is as follows (by weight): 3 parts waste engine oil, 1 part petroleum jelly, 1 part barium petroleum sulfonate, 2 parts hydraulic oil, 0.5 parts glyceryl monostearate, and 0.1 parts carbon black.

[0084] Therefore, the present invention also provides the application of the engine cleaner as described in any embodiment herein in engine cleaning products, the application including: increasing the cloud point of the nonionic surfactant in the cleaner, reducing the amount of water used for thorough cleaning, reducing the penetration time, and reducing the surface tension. Wherein, the cloud point of the cleaner is ≥90℃, preferably ≥92℃, more preferably ≥95℃; the amount of water used for thorough cleaning is ≤1L, preferably ≤0.8L, more preferably ≤0.5L; the penetration time of the cleaner is ≤2min, preferably ≤1.5min, more preferably ≤1min; the cleaning efficiency of the cleaner is ≥90%, such as ≥95% or ≥98%; the surface tension of the cleaner is ≤35mN / m, such as ≤30mN / m or ≤25mN / m.

[0085] The present invention has the following beneficial effects:

[0086] Compared to traditional engine exterior cleaners, the cleaning agent of this invention has high penetration efficiency and can disperse heavy oil stains. During use, there is no need to rinse with a lot of water. Simply spray the cleaning agent onto the surface of the dirt and let it penetrate for 30 seconds to 2 minutes. Then, wipe it directly with a brush or towel to quickly remove the oil stains. It does not produce stains or pollute the tarmac, making it a highly efficient and environmentally friendly engine cleaner.

[0087] The present invention will be further described below by way of specific embodiments. It should be understood that these embodiments are merely illustrative and not intended to limit the scope of the invention. The methods and reagents used in the embodiments, sodium diisooctyl succinate sulfonate (OT-75), were purchased from Nantong Qianhe Chemical Co., Ltd., PEG stearyl amine was purchased from Sanda Chemical (Nantong) Co., Ltd., and DMAC was purchased from Jiangsu Yuntong New Material Technology Co., Ltd. Unless otherwise stated, they are conventional methods and reagents in the art.

[0088] Cleanliness and dirtiness ratio calculation method

[0089] 50g of artificially prepared contaminant was coated onto the surface of a test piece made of stainless steel and weighed. The test piece was then placed in a washing machine for washing at a specified washing frequency. After washing, the test piece was processed and weighed again, and the detergency was calculated according to formula (1).

[0090] Z=(m1-m2) / (m1-m0)×100% (1)

[0091] In the formula: Z — cleaning and soiling rate, %

[0092] m0 — Test piece mass, g

[0093] m1 ——— Mass of the test piece after contamination treatment, in grams

[0094] m2 — Mass of the test piece after rinsing and washing, in grams

[0095] The test solution was prepared using a homemade artificial oil stain to simulate the oil stains on the exterior of an engine. The mixture was prepared by weight ratio as follows: 3 parts waste engine oil, 1 part petroleum jelly, 1 part barium petroleum sulfonate, 2 parts hydraulic oil, 0.5 parts glyceryl monostearate, and 0.1 parts carbon black. The above components were mixed, dissolved at approximately 120°C, stirred thoroughly, and then left to stand at room temperature for later use.

[0096] Cleaner surface tension

[0097] Surface tension measurement and calculation are mainly performed using a surface tension meter, based on the ring method. This involves detaching a metal ring (made of platinum wire) immersed in the cleaning agent solution from the liquid surface. The maximum pulling force F required is equal to the weight G of the ring itself plus the product of the surface tension F0 and the circumference L of the detached liquid surface. The ambient temperature is maintained at approximately 25℃ during the measurement.

[0098] Permeation time measurement

[0099] The canvas settling method was used. A circular canvas with a diameter of 30 mm was used as the test material. Each canvas was placed on the surface of the liquid to be tested, and the time from when the canvas was placed on the surface of the liquid to when it completely settled to the bottom of the liquid was recorded. The shorter the time, the stronger the permeability.

[0100] Turbidity point measurement method

[0101] Take 100 mL of the liquid prepared in the example, and gradually heat it until the liquid begins to become turbid. The temperature of the liquid at this point is the turbidity point.

[0102] Thorough cleaning water consumption calculation

[0103] Soak a 10cm*10cm*0.05cm piece of iron in the aforementioned contaminant solution. Spray the cleaning solution prepared in each embodiment and comparative example onto the contaminated area of ​​the iron piece. Let it stand for 1 minute, then scrub the contaminated area with a brush and wipe it with a clean towel. If there is still dirt residue after wiping, rinse with clean water until there is no dirt. This completes the thorough cleaning of the machine.

[0104] Example 1

[0105] Prepare the engine exterior cleaner as follows:

[0106] (1) Use a weighing device to accurately weigh 4.5 parts of sodium diisooctyl succinate sulfonate, 9 parts of octadecylamine polyoxyethylene ether, 17.5 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0107] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0108] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0109] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0110] Example 2

[0111] Prepare the engine exterior cleaner as follows:

[0112] (1) Use a weighing device to accurately weigh 5 parts of sodium diisooctyl succinate sulfonate, 10 parts of octadecylamine polyoxyethylene ether, 16 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypoazine triacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the remainder of deionized water.

[0113] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0114] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0115] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0116] Example 3

[0117] Prepare the engine exterior cleaner as follows:

[0118] (1) Use a weighing device to accurately weigh 5.5 parts of sodium diisooctyl succinate sulfonate, 8.5 parts of octadecylamine polyoxyethylene ether, 17.5 parts of N,N-dimethylacetamide, 0.6 parts of benzotriazole, 1.8 parts of sodium hypotriacetate, 3.5 parts of benzyl acetone, 1 part of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0119] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0120] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0121] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0122] Example 4

[0123] Prepare the engine exterior cleaner as follows:

[0124] (1) Use a weighing device to accurately weigh 9 parts of sodium diisooctyl succinate sulfonate, 4.5 parts of octadecylamine polyoxyethylene ether, 18 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypoazine triacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0125] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0126] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0127] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0128] Example 5

[0129] Prepare the engine exterior cleaner as follows:

[0130] (1) Use a weighing device to accurately weigh 18 parts of sodium diisooctyl succinate sulfonate, 4.5 parts of octadecylamine polyoxyethylene ether, 9 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypoazine triacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0131] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0132] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0133] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0134] Example 6

[0135] Prepare the engine exterior cleaner as follows:

[0136] (1) Use a weighing device to accurately weigh 18.2 parts of sodium diisooctyl succinate sulfonate, 18 parts of octadecylamine polyoxyethylene ether, 18.1 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0137] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0138] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0139] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0140] Example 7

[0141] Prepare the engine exterior cleaner as follows:

[0142] (1) Use a weighing device to accurately weigh 8.9 parts of sodium diisooctyl succinate sulfonate, 4.5 parts of octadecylamine polyoxyethylene ether, 18.1 parts of N,N-dimethylacetamide, 0.5 parts of benzotriazole, 1.2 parts of sodium hypotriacetate, 3.6 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0143] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0144] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0145] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0146] Example 8

[0147] Prepare the engine exterior cleaner as follows:

[0148] (1) Use a weighing device to accurately weigh 18 parts of sodium diisooctyl succinate sulfonate, 9 parts of octadecylamine polyoxyethylene ether, 36 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0149] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0150] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0151] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0152] Comparative Example 1

[0153] The cleaning process only used water to rinse off the oil stains, and the water consumption for thorough cleaning was 11L, with a cleaning rate of only 23%.

[0154] Comparative Example 2

[0155] Prepare the engine exterior cleaner as follows:

[0156] (1) Use a weighing device to accurately weigh 4.5 parts of sodium diisooctyl succinate sulfonate, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0157] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate and benzylidene acetone into the reaction vessel and mix at 600-800 r / min to completely dissolve sodium diisooctyl succinate sulfonate and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0158] (3) While stirring at the same speed, add sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0159] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0160] Comparative Example 3

[0161] Prepare the engine exterior cleaner as follows:

[0162] (1) Use a weighing device to accurately weigh 9 parts of octadecylamine polyoxyethylene ether, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0163] (2) Weigh the deionized water, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0164] (3) While stirring at the same speed, add sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0165] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0166] Comparative Example 4

[0167] Prepare the engine exterior cleaner as follows:

[0168] (1) Use a weighing device to accurately weigh 17.5 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the remainder of deionized water;

[0169] (2) Weigh the deionized water and benzyl acetone into the reaction vessel and mix at 600-800 r / min to completely dissolve the benzyl acetone in the deionized water to obtain a mixed solution S2.

[0170] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0171] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0172] Comparative Example 5

[0173] Prepare the engine exterior cleaner as follows:

[0174] (1) Use a weighing device to accurately weigh 9 parts of sodium diisooctyl succinate sulfonate, 9 parts of octadecylamine polyoxyethylene ether, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0175] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0176] (3) While stirring at the same speed, add sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0177] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0178] Comparative Example 6

[0179] Prepare the engine exterior cleaner as follows:

[0180] (1) Use a weighing device to accurately weigh 9 parts of octadecylamine polyoxyethylene ether, 9 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0181] (2) Weigh the deionized water, octadecylamine polyoxyethylene ether and benzylidene acetone into the reactor and mix at 600-800 r / min to completely dissolve the octadecylamine polyoxyethylene ether and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0182] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0183] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0184] Comparative Example 7

[0185] Prepare the engine exterior cleaner as follows:

[0186] (1) Use a weighing device to accurately weigh 4.5 parts of sodium diisooctyl succinate sulfonate, 4.5 parts of N,N-dimethylacetamide, 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the balance of deionized water;

[0187] (2) Weigh the deionized water, sodium diisooctyl succinate sulfonate and benzylidene acetone into the reaction vessel and mix at 600-800 r / min to completely dissolve sodium diisooctyl succinate sulfonate and benzylidene acetone in the deionized water to obtain mixed solution S2.

[0188] (3) While stirring at the same speed, add N,N-dimethylacetamide, sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0189] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0190] Comparative Example 8

[0191] Prepare the engine exterior cleaner as follows:

[0192] (1) Use a weighing device to accurately weigh 1 part of benzotriazole, 1.4 parts of sodium hypotriacetate, 4.2 parts of benzyl acetone, 0.8 parts of tetrasodium ethylenediaminetetraacetate, and the remainder of deionized water;

[0193] (2) Weigh the deionized water and benzyl acetone into the reaction vessel and mix at 600-800 r / min to completely dissolve the benzyl acetone in the deionized water to obtain a mixed solution S2.

[0194] (3) While stirring at the same speed, add sodium hypotriacetate, benzyl acetone and tetrasodium ethylenediaminetetraacetate to the mixed solution S2 and disperse for 10-15 min to obtain mixed solution S3;

[0195] (4) Add benzotriazole and disperse for 10 minutes to obtain the cleaning agent solution.

[0196] The cleaning performance of the engine exterior cleaning agents prepared in Examples 1-8 and Comparative Examples 2-8 was tested, and the experimental data are shown in Tables 1-2 below. The amount of cleaning agent used in the above examples and comparative examples was 30 mL. Specifically, the minimum amount of cleaning agent used in Example 4 was 17.4 mL, and the minimum amount used in Example 2 was 26.3 mL.

[0197] Table 1: Surfactant Ratio (%) and Performance Parameters

[0198]

[0199]

[0200] Table 2 Surfactant Ratio (%) and Performance Parameters

[0201]

[0202] As shown in Table 1, compared with cleaning with only water (Comparative Example 1), the engine exterior cleaner of the present invention (Examples 1-8) has a significantly improved cleaning rate. Example 4 is the optimal example, i.e., when the ratio of OT-75, PEG stearyl amine, and DMAC is 2:1:4, the cleaning rate is the highest, the surface tension is the lowest, the surface activity is the highest, and the synergistic effect of the three components is the strongest. As shown in Table 2, after reducing or removing any of the components—sodium diisooctyl succinate, octadecylamine polyoxyethylene ether, or N,N-dimethylacetamide (Comparative Examples 2-8)—the cleaner's ability to remove oil stains significantly decreases, indicating that these three components play an important role in the oil stain removal process.

[0203] The cleaning efficiency and cleaning performance of patent CN200910112365.2 (Comparative Examples 9-13, Table 3), commonly available engine cleaners on the market (Comparative Examples 14-15, Table 3), patent CN201711051027.3 (Comparative Examples 16-22, Table 4), and patent CN201811555279.4 (Comparative Examples 23-30) were tested. The amount used in all comparative examples was 30 mL. The results are shown in Tables 3-5 below.

[0204] The stripping agent consists of ethylamine: tetrabutylammonium hydroxide: 1-octyl-3-methylimidazolium chloride = 3:1:6, the corrosion inhibitor consists of hexamethylenetetramine: cinnamaldehyde: polyaspartic acid = 2:3:5, and the scale inhibitor consists of polyoxyethylene pyrophosphate: sodium humate: polyepoxysuccinic acid = 2:2:6. Comparative Examples 19 and 20 have the same composition but different preparation methods.

[0205] The preparation method of Comparative Example 19 is as follows: (1) 25.2 parts by weight of 3-methoxypropylamine, 9.5 parts by weight of pentaerythritol phosphate and 20 parts by weight of water are mixed and placed in a magnetic stirrer. Under the conditions of 20℃-25℃, the stirring speed is 400 r / min and the mixture is stirred for 22 min to obtain mixture A; (2) 12.7 parts by weight of N,N-dimethylacetamide, 2.5 parts by weight of sodium hydroxide, 19.8 parts by weight of trisodium phosphate and 37 parts by weight of water are mixed and placed in a magnetic stirrer. Under the conditions of 20℃-25℃, the stirring speed is 300 r / min and the mixture is stirred for 35 min to obtain mixture B; (3) The mixture is prepared by step (1) After mixing the mixture A obtained in step 2) and the mixture B obtained in step 2), put them into the reaction vessel, and add 3.2 parts by weight of sodium N-methyltaurate, 9.5 parts by weight of polyepoxysuccinic acid and 4.2 parts by weight of polyvinylpyrrolidone. Control the temperature of the reaction vessel at 60-70℃, the stirring speed at 2501. / min, and stir for 2h to obtain a mixture; (4) Add 8.5 parts by weight of polyaspartic acid, 6.3 parts by weight of stripping agent and 4 parts by weight of polyoxyethylene fatty alcohol ether to the mixture obtained in step (3). Control the temperature of the reaction vessel at 60-70℃, the stirring speed at 300r / min, and stir for 8.5h to obtain the mixture.

[0206] The preparation method of Comparative Example 20 is as follows:

[0207] (1) Mix 24.8 parts by weight of 3-methoxypropylamine, 9 parts by weight of pentaerythritol phosphate and 19 parts by weight of water, place in a magnetic stirrer, and stir for 30 min at 450 r / min under conditions of 20℃-25℃ to obtain mixture A; (2) Mix 12.2 parts by weight of N,N-dimethylacetamide, 2.2 parts by weight of sodium hydroxide, 19.5 parts by weight of trisodium phosphate and 36 parts by weight of water, place in a magnetic stirrer, and stir for 42 min at 350 r / min under conditions of 20℃-25℃ to obtain mixture B; (3) Mix mixture A obtained in step (1) and mixture B obtained in step (2), put into a reaction vessel, and add 3 (3) Add 8.3 parts by weight of sodium diisooctyl succinate sulfonate, 6.1 parts by weight of scale inhibitor, and 3.9 parts by weight of alkylphenol polyoxyethylene ether to the mixture obtained in step (3). Control the temperature of the reactor at 60-70℃, the stirring speed at 250r / min, and stir for 3h to obtain a mixture; (4) Add 8.3 parts by weight of corrosion inhibitor, 6.1 parts by weight of stripping agent, and 3.9 parts by weight of alkylphenol polyoxyethylene ether to the mixture obtained in step (3). Control the temperature of the reactor at 60-70℃, the stirring speed at 350r / min, and stir for 9.5h to obtain the target product; (5) Shake the target product obtained in step (4) in a shaker for 16h with an amplitude of 50mm and a speed of 180rpm, and filter to obtain the final product.

[0208] Table 3: Comparative Examples and Performance Parameters

[0209]

[0210]

[0211] Table 4 Surfactant Ratio (%) and Performance Parameters

[0212]

[0213]

[0214]

[0215] Table 5 Surfactant Ratio (%) and Performance Parameters

[0216]

[0217]

[0218] As shown in Tables 3-5, compared with the cleaning agents of the present invention, although the cleaning rates of Comparative Examples 9-30 are acceptable, their cloud points are lower, the amount of water used for thorough cleaning is larger, and the proportion of surfactants in the cleaning agents is higher.

Claims

1. An engine cleaner characterized by, The cleaning agent contains a surfactant, a co-solvent, and water; wherein the surfactant is a mixture of sodium diisooctyl succinate sulfonate and octadecylamine polyoxyethylene ether, and the co-solvent is N,N-dimethylacetamide; the mass ratio of sodium diisooctyl succinate sulfonate, octadecylamine polyoxyethylene ether, and N,N-dimethylacetamide, based on the total weight of the cleaning agent, is (1~5):(1~10):(1~16); wherein, based on the total weight of the cleaning agent, the cleaning agent comprises: Sodium diisooctyl succinate sulfonate 4.5~20.0 wt%. Octadecylamine polyoxyethylene ether 3.0~20.0 wt%. N,N-Dimethylacetamide 5~40.0 wt%. Benzotriazole 0.5~1.5 wt%. Sodium hypotriacetate 1.0~1.5 wt%. 3.5~4.5 wt% benzyl acetone, and Tetrasodium ethylenediaminetetraacetate 0.5~1 wt%.

2. The engine cleaner of claim 1, wherein, The cleaning agent comprises, by total weight: Sodium diisooctyl succinate sulfonate 8.5~9.5 wt%. Octadecylamine polyoxyethylene ether 4.0~5.0 wt%. N,N-Dimethylacetamide 17.0~19.0 wt%, Benzotriazole 0.5~1.5 wt%. Sodium hypotriacetate 1.0~1.5 wt%. 3.5~4.5 wt% benzyl acetone, and Tetrasodium ethylenediaminetetraacetate 0.5~1 wt%.

3. The cleaning agent as described in claim 1 or 2, characterized in that, Based on the total weight of the cleaning agent, the cleaning agent has one or more of the following characteristics: The sodium hypotriacetate has a mass of 1.2 wt%-1.5 wt%. The content of the ethylenediaminetetraacetic acid tetrasodium is 0.6wt%-1.0wt%.

4. Process for the preparation of a cleaning agent as claimed in any one of claims 1 to 3, characterized in that, The method includes: first adding sodium diisooctyl succinate sulfonate and octadecylamine polyoxyethylene ether, mixing them evenly, and then adding N,N-dimethylacetamide and other components.

5. The use of the cleaning agent as described in any one of claims 1-3 in cleaning an engine.

6. The use of the cleaning agent as described in any one of claims 1-3 in reducing the amount of water used for thorough cleaning and / or reducing the penetration time, characterized in that, The cloud point of the cleaning agent is ≥95℃; The cleaning agent requires ≤0.5L of water for thorough cleaning; The penetration time of the cleaning agent is ≤1 min; The surface tension of the cleaning agent is ≤25 mN / m.

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