CN109735861B - Engine carbon deposition cleaning agent and preparation method thereof - Google Patents
Engine carbon deposition cleaning agent and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the field of engine cleaning agents, and particularly relates to an engine carbon deposition cleaning agent and a preparation method thereof. The carbon deposit cleaning agent for the engine comprises the following raw materials in parts by weight: 28-64 parts of diethylene glycol ethyl ether acetate, 28-65 parts of diethylene glycol monophenyl ether, 28-65 parts of methyl pyrrolidone, 2-8 parts of a lactic acid solution, 181-5 parts of long-chain carboxylic ester polyoxyethylene-181, 1-6 parts of isothiazolinone and 1-9 parts of an alkaline solution. The carbon deposition cleaning agent adopts the cationic surfactant matched with the diethylene glycol ethyl ether acetic acid, the diethylene glycol monophenyl ether and the methyl pyrrolidone, effectively solves the problems of double corrosion on all parts of an engine, falling of an engine coating and falling of ternary noble metal when a solvent, an anionic surfactant and a plasticizer are used for cleaning carbon deposition in the prior art, is environment-friendly and engine-friendly, has a good carbon deposition removing effect, and can play a role in instantly stripping the carbon deposition.
Description
Technical Field
The invention relates to the field of engine cleaning agents, in particular to an engine carbon deposition cleaning agent and a preparation method thereof.
Background
The carbon deposition of the engine refers to residues generated after fuel oil and lubricating oil are combusted in a matched mode, the residues are easy to deposit and adsorb at an air inlet manifold, a throttle valve, an air valve, a combustion chamber, a piston, a spark plug, an oil injector, a three-way catalyst and the like, the cold start of the engine is difficult, the air inlet of the engine is not smooth due to excessive carbon deposition, the shaking phenomenon occurs, the idling is unstable, the oil consumption is increased after the engine is overheated, and parts are easily burnt due to overheating. The deposited carbon deposit in the above position is cation adsorbate, the cation loses one or several electrons, the number of the electrons in the outermost layer reaches 8 or 2 electrons, the larger the atom radius, the stronger the electron losing ability of the atom, the stronger the deposited carbon deposit is closely adsorbed on the metal surface, and the close adsorption on the surface of the inner cavity part of the engine is difficult to clean.
At present, the common carbon deposition cleaning agent mainly uses an anionic surfactant solvent, for example, chinese patent CN108251222A, and the formula of the carbon deposition cleaning agent for the automobile engine is prepared by using solvents such as diethylene glycol butyl ether acetate, N-methyl pyrrolidone solvent, plasticizer isooctanol, gasoline dispersant polyisobutenyl succinimide, catalyst diisoamyl oxalate, antioxidant N, N' -di-sec-butyl-p-phenylenediamine, anionic surfactant blocked dodecyl benzene sulfonic acid, and the like. Although the cleaning agent is neutral and has a certain cleaning effect on carbon deposition in a combustion chamber, the excessive use of the diethylene glycol butyl ether acetate solvent can cause rapid diffusion of an anionic surfactant, so that the metal surface is dry, even if lubricating oil is sprayed and coated on the metal surface to be cleaned, metal surface stress microcracks can be generated on the metal surface of an iron alloy engine, an all-aluminum engine and a magnesium-aluminum engine, and particularly, when an automobile engine runs for more than 1000 kilometers after being cleaned, the generated microcracks are particularly obvious! In addition, after the cleaning agent cleans the three-way catalyst of the engine, the plasticizer isooctanol in the cleaning agent can lead the platinum, the palladium, the rhodium and the engine coating of the three-way catalyst to gradually and quickly fall off in the fuel combustion process of the engine!
Therefore, after the engine is cleaned by using the cleaning agent for a long time, the safety use of the engine is damaged, and the problem that the engine is subjected to excessive re-emission and continuous pollution is easily caused!
Disclosure of Invention
The engine carbon deposit cleaning agent is friendly to the environment and an engine, has a good carbon deposit removing effect, can play a role in instantly stripping carbon deposits, does not damage the engine, has a good instant cleaning effect and is convenient to use.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the engine carbon deposit cleaning agent is composed of the following raw materials in parts by weight: 28-64 parts of diethylene glycol ethyl ether acetate, 28-65 parts of diethylene glycol monophenyl ether, 28-65 parts of methyl pyrrolidone, 2-8 parts of a lactic acid solution, 181-5 parts of long-chain carboxylic ester polyoxyethylene-181, 1-6 parts of isothiazolinone and 1-9 parts of an alkaline solution.
Further, the carbon deposit cleaning agent for the engine comprises the following components in parts by weight: 28-40 parts of diethylene glycol ethyl ether acetate, 28-40 parts of diethylene glycol monophenyl ether, 28-40 parts of methyl pyrrolidone, 2-8 parts of a lactic acid solution, 182-5 parts of long-chain carboxylic ester polyoxyethylene, 2-6 parts of isothiazolinone and 3-9 parts of an alkaline solution.
Further, the carbon deposit cleaning agent for the engine comprises the following components in parts by weight: the composition comprises the following components in parts by weight: 28 parts of diethylene glycol ethyl ether acetate, 28 parts of diethylene glycol monophenyl ether, 28 parts of methyl pyrrolidone, 2 parts of a lactic acid solution, 183 parts of long-chain carboxylic ester polyoxyethylene, 3 parts of isothiazolinone and 8 parts of an alkaline solution.
Further, the alkaline solution is one or a mixture of two of ammonia water, sodium hydroxide solution, potassium hydroxide solution, sodium carbonate or sodium bicarbonate.
Further, the concentration of the lactic acid solution is 0.33-0.88, and the concentration of the alkaline solution is 0.33-0.88.
In addition, the invention also provides a preparation method of the carbon deposit cleaning agent for the engine, which comprises the following steps:
step S1: adding diethylene glycol ethyl ether acetate into a reaction tank, and stirring at the stirring speed of 200r/min-400r/min for 5-10 mins;
step S2: adding diethylene glycol monophenyl ether, and stirring at a stirring speed of 200r/min-400r/min for 5-10 mins;
step S3: adding methyl pyrrolidone, and stirring at a stirring speed of 200r/min-400r/min for 5-10 mins;
step S4: adding lactic acid solution, and stirring at a stirring speed of 200r/min-400r/min for 5-10 mins;
step S5: adding long-chain carboxylic ester polyoxyethylene-18, and stirring at a stirring speed of 200r/min-400r/min for 5-10 mins;
step S6: adding isothiazolinone, and stirring at a stirring speed of 200r/min-400r/min for 5-10 mins;
step S7: heating the reaction tank to 55-70 ℃, and stirring for 1-1.2h at constant temperature to fully fuse all the raw materials;
step S8: adding an alkaline solution, adjusting the pH value, measuring the pH value of the product in the reaction tank by using standard test paper, and stopping adding the alkaline solution when the pH value is 7.
Further, the temperature of the reaction tank in the step S7 is heated to 60 ℃, and the stirring is carried out for 1h at a constant temperature, wherein the stirring speed is 200r/min-600 r/min.
Further, the preparation method of the carbon deposit cleaning agent for the engine further comprises the step S9: and (5) filling the carbon deposition cleaning agent liquid obtained in the step (S8) into an aluminum tank, and filling environment-friendly medical high-purity air or nitrogen into the aluminum tank to obtain the environment-friendly engine carbon deposition cleaning-air spray.
Further, in the step S1-step S6, the stirring speed is 200r/min-300r/min, and the stirring speed is 5 min.
The engine carbon deposition cleaning agent disclosed by the invention adopts a diethylene glycol ether solvent as a main body, is supplemented with a non-pollution solvent diethylene glycol ether acetate with multiple functional groups and a high-boiling-point environment-friendly diethylene glycol monophenyl ether organic solvent, does not contain heavy metals such as Pb and the like, is low in volatility, colorless and transparent liquid, can be highly fused with a cationic surfactant, a nonionic surfactant and a cationic surface dispersing agent, is adjusted to be neutral by using an alkaline solution, and is filled with environment-friendly medical high-purity air or nitrogen to form an environment-friendly carbon deposition cleaning air spray, so that the engine carbon deposition cleaning agent is convenient to use.
The carbon deposit cleaning agent for the engine has a dissolving effect of extraction and extraction on carbon deposits at an engine intake manifold, a throttle valve, a combustion chamber, a piston, a spark plug, an oil sprayer, a three-way catalyst and the like, so that the whole dissolving effect is thoroughly improved. The cleaning agent is environment-friendly, has no corrosion to the whole metal of an iron alloy engine, a full aluminum alloy engine and a magnesium aluminum alloy engine, can not generate stress microcracks even if the cleaning agent is continuously driven for a long distance, does not contain plasticizers which damage noble metal platinum of a three-way catalyst, palladium and rhodium, and can not cause the noble metal platinum, palladium, rhodium and an engine coating to fall off, has a good instant cleaning effect, is nontoxic and harmless, and effectively solves the problems of double corrosion to various parts of the engine, falling off of the engine coating and falling off of the three-way noble metal when a solvent, an anionic surfactant and a plasticizer are used for cleaning carbon deposition in the prior art.
The raw materials selected in the invention can be purchased from commercial sources except for special instructions.
The properties of selected portions of the feedstock of the present invention were analyzed as follows:
diethylene glycol monoethyl ether acetate, boiling point: 217.4 ℃, the substance is a non-pollution solvent with multiple functional groups, can be used as a solvent for protective coatings, has excellent solubility and slow evaporation speed, and is an ideal stripping agent for cleaning carbon deposit of an engine.
Diethylene glycol monophenyl ether, boiling point: 255 and 268 ℃, is a novel zero-VOC high-boiling-point environment-friendly organic solvent, is colorless and transparent liquid with low volatility, can be mixed and dissolved with a plurality of organic solvents, is used as an oil removal auxiliary agent and a penetrating agent, and has the use characteristics of strong washing permeability, mild anticorrosive agent and instant decomposition for improving carbon deposit flash point.
The methyl pyrrolidone is used as a polar aprotic solvent in the application, is a polar solvent with strong selectivity and good stability, has the advantages of low toxicity, high boiling point, strong dissolving power, nonflammability, biodegradability and recyclability, can be mutually dissolved with water, alcohol, ether, ester, ketone, halogenated hydrocarbon and aromatic hydrocarbon, is stable in a neutral medium, can dissolve most polymers, and can immediately make the carbon deposit in a dissolving assisting state when the carbon deposit is instantly contacted with the edge of the carbon deposit under the osmotic cooperation of a cationic surfactant, diethylene glycol monophenyl ether and diethylene glycol ethyl ether acetate.
The lactic acid solution and the cationic surfactant adopt a intermiscibility principle with carbon deposition, the lactic acid solution dissociates cations with surface activity in water, the interaction of the cations in solute and the carbon deposition can eliminate the adhesion of the cationic carbon deposition and provide the possibility of complete dissolution for the cationic carbon deposition, and the solution has better performance than an organic scale remover, can provide good moisture retention and dissolution performance, is acidic and can be used for adjusting the pH value of a cleaning agent.
The long-chain carboxylic ester polyoxyethylene-18 and the nonionic surfactant are carbon fatty acid esters and ester molecular structures, have strong dissolving and removing capacities on grease, mineral oil and paraffin wax according to the similar intermiscibility principle, have better dispersing and removing forces on the lipid due to a double-bond structure, have the same excellent washing performance, grease solubilization, dispersibility and wettability even under the conditions of high temperature or low temperature, have obvious advantages on energy conservation, emission reduction and environmental protection, and have an auxiliary effect on the activity improvement of precious metals such as platinum, rhodium of a three-way catalyst.
Isothiazolinone, non-ionic solubilizing detergent, mainly composed of 5-chloro-2-methyl-4-isothiazolin-3-one (CMI) and 2-methyl-4-isothiazolin-3-one (MI). At high dose, isothiazolinone has obvious effect on stripping biological slime and has instant dissolving-assisting performance on compact adsorption of carbon deposit cation.
Alkaline solution: after the pH value is adjusted by using the alkaline solution, the adsorption characteristic that the carbon deposit cation deposits are tightly adsorbed on each position of the engine is ionized and balanced, the carbon deposit cation adsorption is promoted to disappear, and the carbon deposit is separated instantly. Meanwhile, the alkaline solution protects the metal coating of the engine and avoids stress micro-cracking on the metal surface of iron alloy, all-aluminum alloy and magnesium-aluminum alloy generated in the driving process of the engine after cleaning.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
In the following examples, 1 part by weight of 1g was used, and the pH was measured using standard test paper from Guangzhou chemical reagent manufacturer.
Example 1
The carbon deposit cleaning agent for the automobile engine comprises the following raw materials in parts by weight: 28 parts of diethylene glycol ethyl ether acetate, 28 parts of diethylene glycol monophenyl ether, 28 parts of methyl pyrrolidone, 2 parts of a lactic acid solution, 183 parts of long-chain carboxylic ester polyoxyethylene, 3 parts of isothiazolinone and 9 parts of an ammonia water solution.
The concentration of the lactic acid solution is 0.58, and the concentration of the ammonia water solution is 0.37.
The preparation method of the cleaning agent comprises the following steps:
step S1: adding diethylene glycol ethyl ether acetate into a reaction tank, and stirring at the stirring speed of 200r/min for 5 mins;
step S2: adding diethylene glycol monophenyl ether, and stirring at a stirring speed of 200r/min for 5 mins;
step S3: adding methyl pyrrolidone, and stirring at a stirring speed of 200r/min for 5 mins;
step S4: adding lactic acid solution, and stirring at a stirring speed of 200r/min for 5 mins;
step S5: adding long-chain carboxylic ester polyoxyethylene-18, and stirring at a stirring speed of 200r/min for 5 mins;
step S6: adding isothiazolinone, and stirring at a stirring speed of 200r/min for 5 mins;
step S7: heating the reaction tank to 60 ℃, stirring for 1h at constant temperature with the stirring speed of 400r/min to fully fuse all the raw materials;
step S8: adding an ammonia water solution, adjusting the pH value, measuring the pH value of a product in the reaction tank by using standard test paper, and stopping adding the alkaline solution when the pH value is 7;
step S9: and (5) filling the carbon deposition cleaning agent liquid obtained in the step (S8) into an aluminum tank, and filling environment-friendly medical high-purity air or nitrogen into the aluminum tank to obtain the environment-friendly engine carbon deposition cleaning-air spray.
Effect testing
(1) Carbon deposit cleaning test: coating the surface of the metal plate with a thickness of 1mil and an area of 100cm3And (3) drying the deposited carbon, uniformly spraying the cleaning agent on the deposited carbon on the surface of the metal plate when the test is started, and spraying deionized water after 30 seconds to remove the deposited carbon on the surface of the metal plate.
(2) And (3) corrosion test: the method comprises the steps of respectively manufacturing two metal boxes by using three metals of iron alloy, full aluminum and magnesium aluminum alloy, dividing the six metal boxes into A, B two groups of test groups, wherein each group of test group comprises 1 iron alloy box, 1 full aluminum box and 1 magnesium aluminum alloy box, spraying a conventional (CN108251222A) carbon deposition cleaning agent on the surface of the A group of metal boxes, spraying the carbon deposition cleaning agent on the surface of the B group of metal boxes, placing the A, B two groups of metal boxes in an oven at 450 ℃, heating for 7 hours, taking out, and naturally cooling to room temperature. After repeating the heating and cooling 3 times in this manner, the surface change of each metal box was observed, and the results are shown in Table 1. The surface of the metal box of the group A has fine cracks, while the metal box of the group B has no obvious change, so that the carbon deposition cleaning agent can not damage the metal surfaces of iron alloy engines, all-aluminum engines and magnesium-aluminum engines.
TABLE 1A, B comparison of Corrosion test results for two test groups
| Components | Situation of addition | Iron alloy box | All-aluminum box | Magnalium box |
| A | Spraying conventional carbon deposit remover | With fine cracks | With fine cracks | With fine cracks |
| B | Spray coating of the carbon deposit remover of the embodiment | Without obvious change | Without obvious change | Without obvious change |
(3) When a certain popular fast-rising car runs for 39.8 kilometers, the engine of the car has high noise, the tail gas is dark and sharp, carbon deposition in an exhaust pipe is serious, 100ml of the cleaning agent is added into an inner cavity of the engine and mixed with old engine oil after the tail gas discharged by the car is measured by a PM2.5 measuring instrument and an automobile exhaust analyzer, the car is restarted for 10min, flameout is carried out after the vehicle is restarted, the old engine oil is poured out and replaced by new engine oil, the tail gas discharge condition of the car is measured again, and the result is shown in Table 2.
Table 2 comparison of vehicle exhaust gas detection before and after addition of the cleaning agent of the present embodiment
Before the cleaning agent is added, the exhaust of the car seriously exceeds the standard, after the cleaning agent is added, the sound of an engine of the car is recovered to be normal, the exhaust does not generate peculiar smell any more, an exhaust pipe is clean and has no carbon deposition, the exhaust emission quality also reaches the standard, and the emission amount of harmful exhaust is reduced by more than 90%.
(4) Cleaning and detecting the three-way catalyst: starting the engine, preheating to normal working temperature, maintaining the engine speed at 2500r/min, lifting the vehicle, and measuring the inlet temperature of the three-way catalyst to be 436-. After the cleaning agent is used for cleaning, the inlet temperature of the three-way catalyst is measured to be 402-. Before cleaning, carbon deposition exists in the three-way catalyst, so that the inlet temperature and the outlet temperature of the three-way catalyst are higher than the temperature after cleaning, the outlet temperature of the three-way catalyst after cleaning is higher than the inlet temperature by 10-15%, and the inlet temperature of the three-way catalyst is 400-550 ℃ in the standard 2500r/min state, namely the engine carbon deposition cleaning agent does not influence the normal use of the three-way catalyst.
After the cleaning agent of the embodiment is used for cleaning the three-way catalyst, the engine is driven for 12 hours under the condition that the rotating speed of the engine is kept at 2500r/min, a vehicle is lifted, no obvious dent and scratch exists on the surface of the three-way catalyst, no fading spots or slight cyan and purple marks exist, no dark gray spots exist in the center of a protective cover of the three-way catalyst, and the fact that the cleaning agent for carbon deposition of the engine in the embodiment cannot damage the three-way catalyst is shown.
Example 2
The carbon deposit cleaning agent for the automobile engine comprises the following raw materials in parts by weight: 28 parts of diethylene glycol ethyl ether acetate, 29 parts of diethylene glycol monophenyl ether, 30 parts of methyl pyrrolidone, 2.5 parts of a lactic acid solution, 183 parts of long-chain carboxylic ester polyoxyethylene, 3.5 parts of isothiazolinone and 4 parts of a sodium hydroxide solution.
The concentration of the lactic acid solution is 0.64, and the concentration of the sodium hydroxide solution is 0.42.
The preparation method of the cleaning agent comprises the following steps:
step S1: adding diethylene glycol ethyl ether acetate into a reaction tank, and stirring at the stirring speed of 250r/min for 5 mins;
step S2: adding diethylene glycol monophenyl ether, and stirring at a stirring speed of 250r/min for 5 mins;
step S3: adding methyl pyrrolidone, and stirring at a stirring speed of 250r/min for 5 mins;
step S4: adding lactic acid solution, and stirring at a stirring speed of 250r/min for 5 mins;
step S5: adding long-chain carboxylic ester polyoxyethylene-18, and stirring at a stirring speed of 250r/min for 5 mins;
step S6: adding isothiazolinone, and stirring at a stirring speed of 250r/min for 5 mins;
step S7: heating the reaction tank to 60 ℃, stirring for 1h at constant temperature with the stirring speed of 500r/min to fully fuse all the raw materials;
step S8: adding sodium hydroxide solution, adjusting pH, measuring the pH value of the product in the reaction tank by using standard test paper, and stopping adding alkaline solution when the pH value is 7;
step S9: and (5) filling the carbon deposition cleaning agent liquid obtained in the step (S8) into an aluminum tank, and filling environment-friendly medical high-purity air or nitrogen into the aluminum tank to obtain the environment-friendly engine carbon deposition cleaning-air spray.
Effect testing
(1) Carbon deposit cleaning test: coating the surface of the metal plate with a thickness of 1mil and an area of 100cm3And (3) drying the deposited carbon, uniformly spraying the cleaning agent on the deposited carbon on the surface of the metal plate when the test is started, and spraying deionized water after 28 seconds to remove the deposited carbon on the surface of the metal plate.
(2) And (3) corrosion test: the method comprises the steps of respectively manufacturing two metal boxes by using three metals of iron alloy, full aluminum and magnesium aluminum alloy, dividing the six metal boxes into C, D two groups of test groups, wherein each group of test group comprises 1 iron alloy box, 1 full aluminum box and 1 magnesium aluminum alloy box, spraying conventional (CN108251222A) carbon deposition cleaning agent on the surface of a group C metal box, spraying the carbon deposition cleaning agent on the surface of a group D metal box, placing the two groups of C, D metal boxes in an oven at 450 ℃, heating for 7 hours, taking out, and naturally cooling to room temperature. After repeating the heating and cooling 3 times in this manner, the surface change of each metal box was observed, and the results are shown in Table 3. The surface of the metal box of the group C has fine cracks, while the metal box of the group D has no obvious change, so that the carbon deposition cleaning agent can not damage the metal surfaces of the iron alloy engine, the all-aluminum engine and the magnesium-aluminum engine.
TABLE 3C, D comparison of Corrosion test results for two test groups
| Components | Situation of addition | Iron alloy box | All-aluminum box | Magnalium box |
| C | Spraying conventional carbon deposit remover | With fine cracks | With fine cracks | With fine cracks |
| D | Spray coating of the carbon deposit remover of the embodiment | Without obvious change | Without obvious change | Without obvious change |
(3) When a certain Audi A6 car runs for 22.3 kilometers, the car is difficult to start and easy to extinguish, peculiar smell is generated in exhaust emission, and the engine shakes, 100ml of the cleaning agent is taken out and added into an inner cavity of the engine after the exhaust emission of the car is measured by a PM2.5 measuring instrument and a car exhaust analyzer, the cleaning agent is mixed with old engine oil, the car is restarted for 10min to extinguish after idling, the old engine oil is poured out and replaced by new engine oil, and the exhaust emission condition of the car is measured again, and the results are shown in Table 4.
Table 4 comparison of vehicle exhaust gas detection before and after addition of the cleaning agent of the present embodiment
The carbon deposit cleaning agent is added into the vehicle oil tank, the vehicle is started to idle for 10min and then is flamed out, old engine oil is poured out and new engine oil is replaced, the vehicle is easy to ignite, the engine is stable to drive, harmful gas in tail gas emission is greatly reduced, the carbon deposit in the engine is separated from the engine quickly, peculiar smell of tail gas is avoided, and the tail gas emission quality reaches the standard.
(4) Cleaning and detecting the three-way catalyst: starting the engine, preheating to normal working temperature, maintaining the engine speed at 2500r/min, lifting the vehicle, and measuring the inlet temperature of the three-way catalyst to be 415-. After the cleaning agent is used for cleaning, the inlet temperature of the three-way catalyst is measured to be 401-. Before cleaning, carbon deposition exists in the three-way catalyst, so that the inlet temperature and the outlet temperature of the three-way catalyst are higher than the temperature after cleaning, the outlet temperature of the three-way catalyst after cleaning is higher than the inlet temperature by 10-15%, and the inlet temperature of the three-way catalyst is 400-550 ℃ in the standard 2500r/min state, namely the engine carbon deposition cleaning agent does not influence the normal use of the three-way catalyst.
After the cleaning agent of the embodiment is used for cleaning the three-way catalyst, the engine is driven for 12 hours under the condition that the rotating speed of the engine is kept at 2500r/min, a vehicle is lifted, no obvious dent and scratch exists on the surface of the three-way catalyst, no fading spots or slight cyan and purple marks exist, no dark gray spots exist in the center of a protective cover of the three-way catalyst, and the fact that the cleaning agent for carbon deposition of the engine in the embodiment cannot damage the three-way catalyst is shown.
Example 3
The carbon deposit cleaning agent for the automobile engine comprises the following raw materials in parts by weight: 29 parts of diethylene glycol ethyl ether acetate, 29 parts of diethylene glycol monophenyl ether, 29 parts of methyl pyrrolidone, 3 parts of a lactic acid solution, 183 parts of long-chain carboxylic ester polyoxyethylene, 3 parts of isothiazolinone and 4 parts of a potassium hydroxide solution.
The concentration of the lactic acid solution is 0.72, and the concentration of the potassium hydroxide solution is 0.46.
The preparation method of the cleaning agent comprises the following steps:
step S1: adding diethylene glycol ethyl ether acetate into a reaction tank, and stirring at the stirring speed of 280r/min for 5 mins;
step S2: adding diethylene glycol monophenyl ether, and stirring at a stirring speed of 280r/min for 5 mins;
step S3: adding methyl pyrrolidone, and stirring at a stirring speed of 280r/min for 5 mins;
step S4: adding lactic acid solution, and stirring at a stirring speed of 250r/min for 5 mins;
step S5: adding long-chain carboxylic ester polyoxyethylene-18, and stirring at a stirring speed of 250r/min for 5 mins;
step S6: adding isothiazolinone, and stirring at a stirring speed of 250r/min for 5 mins;
step S7: heating the reaction tank to 65 ℃, stirring at a constant temperature of 450r/min for 1.2h to fully fuse the raw materials;
step S8: adding a potassium hydroxide solution, adjusting the pH value, measuring the pH value of the product in the reaction tank by using standard test paper, and stopping adding the alkaline solution when the pH value is 7;
step S9: and (5) filling the carbon deposition cleaning agent liquid obtained in the step (S8) into an aluminum tank, and filling environment-friendly medical high-purity air or nitrogen into the aluminum tank to obtain the environment-friendly engine carbon deposition cleaning-air spray.
Effect testing
(1) Carbon deposit cleaning test: coating the surface of the metal plate with a thickness of 1mil and an area of 100cm3And (3) drying the deposited carbon, uniformly spraying the cleaning agent on the deposited carbon on the surface of the metal plate when the test is started, and spraying deionized water for 31 seconds to clean the deposited carbon on the surface of the metal plate.
(2) And (3) corrosion test: the method comprises the steps of respectively manufacturing two metal boxes by using three metals of iron alloy, full aluminum and magnesium aluminum alloy, dividing the six metal boxes into E, F two groups of test groups, wherein each group of test group comprises 1 iron alloy box, 1 full aluminum box and 1 magnesium aluminum alloy box, spraying conventional (CN108251222A) carbon deposition cleaning agent on the surface of the E group of metal boxes, spraying the carbon deposition cleaning agent on the surface of the F group of metal boxes, placing the E, F two groups of metal boxes in an oven at 450 ℃, heating for 7 hours, taking out, and naturally cooling to room temperature. After repeating the heating and cooling 3 times in this manner, the surface change of each metal box was observed, and the results are shown in Table 5. The surface of the metal box of the group E has fine cracks, while the metal box of the group F has no obvious change, so that the carbon deposition cleaning agent can not damage the metal surfaces of the iron alloy engine, the all-aluminum engine and the magnesium-aluminum engine.
TABLE 5E, F comparison of Corrosion test results for two test groups
| Components | Situation of addition | Iron alloy box | All-aluminum box | Magnalium box |
| E | Spraying conventional carbon deposit remover | With fine cracks | With fine cracks | With fine cracks |
| F | Spray coating of the carbon deposit remover of the embodiment | Without obvious change | Without obvious change | Without obvious change |
(3) The Xuanyi car produced at a certain day runs for 69.3 kilometers, a large amount of carbon deposits are formed at the positions of an air inlet manifold, a throttle valve, an air valve, a combustion chamber, a piston, a spark plug, an oil sprayer, a three-way catalyst and the like of the car, the engine is difficult to start in a cold state, the air inlet of the engine is not smooth, the phenomenon of shaking occurs, the idling is unstable, 100ml of cleaning agent in the embodiment is taken after the exhaust gas discharged by the car is measured by a PM2.5 measuring instrument and an automobile exhaust gas analyzer, the cleaning agent is added into the inner cavity of the engine and mixed with old engine oil, the car is restarted and flameout after idling for 10min, the old engine oil is poured out and replaced with new engine oil.
TABLE 6 comparison of vehicle exhaust gas detection before and after addition of the cleaning agent of the present example
The carbon deposition cleaning agent is added into the vehicle oil tank, the vehicle is started to idle for 10min and then is flamed out, old engine oil is poured out and replaced by new engine oil, the carbon deposition of the vehicle air inlet manifold, the throttle valve, the air valve, the combustion chamber, the piston, the spark plug, the oil sprayer and the three-way catalyst is cleaned, the vehicle is easy to ignite, the engine smoothly enters air, the shaking phenomenon does not occur any more, and the tail gas emission quality reaches the standard.
(4) Cleaning and detecting the three-way catalyst: starting the engine, preheating to normal working temperature, maintaining the engine speed at 2500r/min, lifting the vehicle, and measuring the inlet temperature of the three-way catalyst to be 491 ℃ and the outlet temperature of the three-way catalyst to be 545 ℃ by using a digital thermometer (a contact or non-contact infrared laser thermometer). After the cleaning agent of the embodiment is used for cleaning, the inlet temperature of the three-way catalyst is measured to be 422-. Before cleaning, carbon deposition exists in the three-way catalyst, so that the inlet temperature and the outlet temperature of the three-way catalyst are higher than the temperature after cleaning, the outlet temperature of the three-way catalyst after cleaning is higher than the inlet temperature by 10-15%, and the inlet temperature of the three-way catalyst is 400-550 ℃ in the standard 2500r/min state, namely the engine carbon deposition cleaning agent does not influence the normal use of the three-way catalyst.
After the cleaning agent of the embodiment is used for cleaning the three-way catalyst, the engine is driven for 12 hours under the condition that the rotating speed of the engine is kept at 2500r/min, a vehicle is lifted, no obvious dent and scratch exists on the surface of the three-way catalyst, no fading spots or slight cyan and purple marks exist, no dark gray spots exist in the center of a protective cover of the three-way catalyst, and the fact that the cleaning agent for carbon deposition of the engine in the embodiment cannot damage the three-way catalyst is shown.
Example 4
The carbon deposit cleaning agent for the automobile engine comprises the following raw materials in parts by weight: 28 parts of diethylene glycol ethyl ether acetate, 29.5 parts of diethylene glycol monophenyl ether, 29.5 parts of methyl pyrrolidone, 2 parts of a lactic acid solution, 182.5 parts of long-chain carboxylic ester polyoxyethylene, 2.5 parts of isothiazolinone and 6 parts of an ammonia water solution.
The concentration of the lactic acid solution is 0.80, and the concentration of the ammonia water solution is 0.48.
The preparation method of the cleaning agent comprises the following steps:
step S1: adding diethylene glycol ethyl ether acetate into a reaction tank, and stirring at the stirring speed of 300r/min for 5 mins;
step S2: adding diethylene glycol monophenyl ether, and stirring at a stirring speed of 300r/min for 5 mins;
step S3: adding methyl pyrrolidone, and stirring at a stirring speed of 300r/min for 5 mins;
step S4: adding lactic acid solution, and stirring at a stirring speed of 300r/min for 5 mins;
step S5: adding long-chain carboxylic ester polyoxyethylene-18, and stirring at a stirring speed of 300r/min for 5 mins;
step S6: adding isothiazolinone, and stirring at a stirring speed of 300r/min for 5 mins;
step S7: heating the reaction tank to 58 ℃, stirring at a constant temperature of 500r/min for 1.1h to fully fuse the raw materials;
step S8: adding ammonia water solution, adjusting pH, measuring the pH value of the product in the reaction tank by using standard test paper, and stopping adding alkaline solution when the pH value is 7;
step S9: and (5) filling the carbon deposition cleaning agent liquid obtained in the step (S8) into an aluminum tank, and filling environment-friendly medical high-purity air or nitrogen into the aluminum tank to obtain the environment-friendly engine carbon deposition cleaning-air spray.
Effect testing
(1) Carbon deposit cleaning test: coating the surface of the metal plate with a thickness of 1mil and an area of 100cm3And (3) drying, uniformly spraying the cleaning agent on the carbon deposit on the surface of the metal plate when the test is started, and spraying deionized water for 29 seconds to remove the carbon deposit on the surface of the metal plate.
(2) And (3) corrosion test: the method comprises the steps of respectively manufacturing two metal boxes by using three metals of iron alloy, full aluminum and magnesium aluminum alloy, dividing the six metal boxes into G, H two groups of test groups, wherein each group of test group comprises 1 iron alloy box, 1 full aluminum box and 1 magnesium aluminum alloy box, spraying conventional (CN108251222A) carbon deposition cleaning agent on the surface of the G group of metal boxes, spraying the carbon deposition cleaning agent on the surface of the H group of metal boxes, placing the G, H two groups of metal boxes in an oven at 450 ℃, heating for 7 hours, taking out, and naturally cooling to room temperature. After repeating the heating and cooling 3 times in this manner, the surface change of each metal box was observed, and the results are shown in Table 7. The surface of the metal box of the group G has fine cracks, while the metal box of the group H has no obvious change, so that the carbon deposition cleaning agent can not damage the metal surfaces of the iron alloy engine, the all-aluminum engine and the magnesium-aluminum engine.
TABLE 7G, H comparison of Corrosion test results for two test groups
| Components | Situation of addition | Iron alloy box | All-aluminum box | Magnalium box |
| G | Spraying conventional carbon deposit remover | With fine cracks | With fine cracks | With fine cracks |
| H | Spray coating of the carbon deposit remover of the embodiment | Without obvious change | Without obvious change | Without obvious change |
(3) After the exhaust gas discharged by a certain BMW five-series car is measured by a PM2.5 measuring instrument and an automobile exhaust analyzer, 100ml of the cleaning agent in the embodiment is added into an inner cavity of an engine to be mixed with old engine oil, the car is restarted for 10min to be shut down, the old engine oil is poured out to be changed into new engine oil, the exhaust gas discharge condition of the car is measured again, and the results are shown in Table 8.
TABLE 8 comparison of vehicle exhaust detection before and after addition of the cleaning agent of this example
The carbon deposition cleaning agent is added into the vehicle oil tank, the vehicle is started to stop after idling for 10min, old engine oil is poured out and replaced by new engine oil, the vehicle is stable in idling, oil consumption is reduced, acceleration is stable, tail gas emission quality reaches the standard, and the cough phenomenon does not occur.
(4) Cleaning and detecting the three-way catalyst: starting the engine, preheating to normal working temperature, maintaining the engine speed at 2500r/min, lifting the vehicle, and measuring the inlet temperature of the three-way catalyst to be 411-. After the cleaning agent is used for cleaning, the inlet temperature of the three-way catalyst is measured to be 400-428 ℃ and the outlet temperature of the three-way catalyst is measured to be 443-487 ℃ under the condition that the engine speed is kept at 2500 r/min. Before cleaning, carbon deposition exists in the three-way catalyst, so that the inlet temperature and the outlet temperature of the three-way catalyst are higher than the temperature after cleaning, the outlet temperature of the three-way catalyst after cleaning is higher than the inlet temperature by 10-15%, and the inlet temperature of the three-way catalyst is 400-550 ℃ in the standard 2500r/min state, namely the engine carbon deposition cleaning agent does not influence the normal use of the three-way catalyst.
After the cleaning agent of the embodiment is used for cleaning the three-way catalyst, the engine is driven for 12 hours under the condition that the rotating speed of the engine is kept at 2500r/min, a vehicle is lifted, no obvious dent and scratch exists on the surface of the three-way catalyst, no fading spots or slight cyan and purple marks exist, no dark gray spots exist in the center of a protective cover of the three-way catalyst, and the fact that the cleaning agent for carbon deposition of the engine in the embodiment cannot damage the three-way catalyst is shown.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (4)
1. The carbon deposit cleaning agent for the engine is characterized by comprising the following raw materials in parts by weight: 28 parts of diethylene glycol ethyl ether acetate, 29-29.5 parts of diethylene glycol monophenyl ether, 29.5-30 parts of methyl pyrrolidone, 2-2.5 parts of a lactic acid solution, 182.5-3 parts of long-chain carboxylic ester polyoxyethylene, 2.5-3.5 parts of isothiazolinone and 4-6 parts of an alkaline solution, wherein the concentration of the lactic acid solution is 0.64-0.80, the concentration of the alkaline solution is 0.42-0.48, and the alkaline solution is ammonia water or a sodium hydroxide solution.
2. A method for preparing a carbon deposit cleaner for an engine according to claim 1, which comprises the following steps:
step S1: adding diethylene glycol ethyl ether acetate into a reaction tank, and stirring at the speed of 250-300 r/min for 5 mins;
step S2: adding diethylene glycol monophenyl ether, and stirring at a stirring speed of 250-300 r/min for 5 mins;
step S3: adding methyl pyrrolidone, and stirring at a stirring speed of 250r/min-300 r/min for 5 mins;
step S4: adding lactic acid solution, and stirring at a stirring speed of 250-300 r/min for 5 mins;
step S5: adding long-chain carboxylic ester polyoxyethylene-18, and stirring at a stirring speed of 250r/min-300 r/min for 5 mins;
step S6: adding isothiazolinone, and stirring at a stirring speed of 250r/min-300 r/min for 5 mins;
step S7: heating the reaction tank to 58-60 ℃, and stirring for 1-1.1h at constant temperature to fully fuse all the raw materials;
step S8: adding an alkaline solution, adjusting the pH value, measuring the pH value of the product in the reaction tank by using standard test paper, and stopping adding the alkaline solution when the pH value is 7.
3. The preparation method of the carbon deposit cleaning agent for the engine as claimed in claim 2, wherein the temperature of the reaction tank in the step S7 is heated to 60 ℃, the stirring is carried out for 1h at a constant temperature, and the stirring speed is 500 r/min.
4. The preparation method of the carbon deposit cleaning agent for the engine as claimed in claim 2, wherein: further comprising step S9: and (5) filling the carbon deposition cleaning agent liquid obtained in the step (S8) into an aluminum tank, and filling environment-friendly medical high-purity air or nitrogen into the aluminum tank to obtain the environment-friendly engine carbon deposition cleaning-air spray.
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