Neutral oil removal, rust removal and rust prevention three-in-one cleaning agent and preparation method thereof

Abstract

The invention discloses an environment-friendly neutral oil and rust removal and prevention three-in-one cleaning agent which is composed of sodium hydroxide, sodium tripolyphosphate, sodium gluconate, lactic acid, a surfactant, an OP-10 compound, ammonium molybdate, a rust remover, ethylene glycol, hydroxysuccinic acid, methylpyruvic acid and soft water. The environment-friendly neutral oil and rust removal and prevention three-in-one cleaning agent provided by the invention is neutral liquid with the pH value of 6.8-7.2, has no slag, does not need surface conditioning, does not need an accelerant, does not contain inorganic phosphoric acid, does not contain toxic and harmful heavy metals such as nickel, chromium, cadmium, manganese and the like, does not contain volatile toxic and harmful organic components, and is non-flammable and non-explosive. The cleaning agent is a metal coating pretreatment cleaning agent integrating oil removal, rust removal and film coating; compared with traditional phosphating, the treatment area per kilogram is about 150 m < 2 > or above and is three times or above that of traditional phosphating, the technological process is shortened, meanwhile, the beneficial effects of energy conservation and environmental protection are achieved, and the pretreatment cost of coating is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of industrial cleaning, and in particular to an environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent and a preparation method thereof. Background Art

[0002] The cleaning of metal parts surface is particularly important in the field of pre-coating treatment. In many industries, such as home appliances, automobiles, shipbuilding, machinery, electronics and other industries, workpieces need to be degreased, degreased, derusted, and cleaned of various common oil stains, lubricants, etc. before electroplating, powder spraying, anti-corrosion or other surface treatments.

[0003] In the field of pre-treatment before painting, due to the influence of the previous punching and welding process, some oxide scale will remain on the surface of metal parts to a greater or lesser extent, which will affect the subsequent coating film coverage, adhesion and performance of the paint film; during the storage and transportation of metal parts before painting, due to the lack of important anti-corrosion treatment, some rust may occur locally, affecting the subsequent phosphating anti-corrosion treatment and paint film coverage. These two points can often be removed through the pickling and rust removal process. Oil stains, putty, carbon powder, iron filings and other attachments on the surface of metal parts can often be removed through degreasing and degreasing processes.

[0004] However, the inorganic pickling and rust removal methods currently used are too acidic, which is very harmful to equipment, operators and the coating environment. Wastewater treatment is also troublesome and difficult to meet environmental protection requirements. In addition, the pickling time usually takes 5-20 minutes or even longer, which seriously affects the existing coating production rhythm. Therefore, most coating workshops have basically cancelled the pickling and rust removal process. In this way, the welds and oxide scales formed during the punching and welding process, as well as the local slight rust produced during some storage and transportation processes, seriously affect the quality of pre-treatment and the appearance and adhesion of the subsequent coating film, resulting in a decrease in the corrosion resistance of the paint film and a hidden danger in use.

[0005] At present, the cleaning processes used in the field of industrial cleaning are mainly: degreasing with sodium hydroxide, trisodium phosphate and surfactant; derusting with nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid, aminosulfonic acid, etc.; passivation with sodium nitrite or chromium oxide. These strong acids and alkalis are inconvenient to transport, cause serious environmental pollution when used, are very harmful to the human body, are highly corrosive to equipment, and generate a large amount of wastewater after cleaning. There are also some modified processes that use citric acid or EDTA for cleaning, but the COD of the wastewater from these two cleanings is very high, which brings great trouble to post-treatment, and it also needs to be heated to a very high temperature during cleaning, which is very inconvenient during operation.

[0006] There are also some organic weak acid rust removers or neutral rust removers in the market, but the rust removal speed is far from meeting the requirements. For example, the neutral degreasing and rust removal cleaning agent formula provided by Chinese patent CN1297646 is also mainly composed of organic acids, chelating agents, inorganic salts, corrosion inhibitors, etc., but the cleaning time is 6-18h, which cannot meet the existing coating production rhythm requirements at all. Summary of the invention

[0007] The purpose of the present invention is to provide an environmentally friendly neutral three-in-one cleaning agent for degreasing, derusting and preventing rust, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: an environmentally friendly neutral degreasing, rust removal and rust prevention three-in-one cleaning agent, the weight percentage of each component is as follows: Sodium hydroxide: 1% to 15% Sodium tripolyphosphate: 1%~20% Sodium gluconate: 5% to 20% Lactic acid: 5% ~ 30% Surfactant: 1%~20% OP-10 compound: 5% ~ 10% Ammonium molybdate: 0.1%~5% Rust remover: 1% to 10% Ethylene glycol: 1% to 15% Hydroxysuccinic acid: 0.2% to 0.5% Methylpyruvic acid: 0.5% to 1.5% Soft water: Balance.

[0009] Preferably, the surfactant is an alkyl sulfate and / or a linear alkyl benzene sulfonate.

[0010] Preferably, the surfactant is cocamidopropyl betaine and / or sodium cocoyl glutamate.

[0011] Preferably, the surfactant is prepared according to a mass ratio of cocamidopropyl betaine:sodium cocoyl glutamate=1:3, and the total added amount does not exceed 5% of the total mass of the cleaning agent.

[0012] Preferably, the hydroxysuccinic acid is one or more of 2-hydroxysuccinic acid, 2,3-dihydroxysuccinic acid, 2-hydroxypropionic acid, 3-methylpyruvic acid, o-hydroxybenzoic acid, fumaric acid, and maleic acid.

[0013] Preferably, the hydroxysuccinic acid is 2-hydroxysuccinic acid or 2,3-dihydroxysuccinic acid.

[0014] Preferably, the mass percentage of soft water is controlled at 30% to 60%.

[0015] Preferably, the pH value of the cleaning agent is 6.8-7.2.

[0016] A method for preparing an environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent, the preparation method is carried out according to the following steps: (1) Accurately weigh each component of the cleaning agent according to its mass ratio and set aside; (2) First add half of the soft water into the mixing and dispersing tank, then add lactic acid, hydroxysuccinic acid, and methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually inspect the mixture to make it uniform and transparent. (3) Then slowly add sodium hydroxide, sodium tripolyphosphate, sodium gluconate, ammonium molybdate, rust remover, and ethylene glycol while stirring, adjust the speed to 320-360 rpm, and stir for 40-50 min; (4) Add the other half of soft water to control the dispersion tank temperature to ≤50℃. Finally, add the surfactant and OP-10 compound, also while adding and stirring, adjust the speed to 300-350 rpm, stir for 30-40 min, stir the solution until it is homogeneous, and filter to obtain the three-in-one cleaning agent.

[0017] The present invention provides a cleaning process using an environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent, which can adopt a spraying or dipping process at room temperature. The spraying process has a treatment time of 1 to 2 minutes, and the dipping process has a treatment time of 4 to 5 minutes.

[0018] Preferably, during the immersion treatment, in order to obtain a more uniform protective film, the cleaning liquid is preferably kept in an appropriately stirred state.

[0019] Beneficial effects: The beneficial effects of the present invention are: the environmentally friendly neutral degreasing, rust removal and rust prevention three-in-one cleaning agent provided by the present invention is a neutral liquid with a pH value of 6.8 to 7.2, no residue, no surface adjustment, no accelerator, no inorganic phosphoric acid, no toxic and harmful heavy metals such as nickel, chromium, cadmium, manganese, no volatile toxic and harmful organic components, non-flammable and non-explosive. This cleaning agent is a three-in-one metal coating pretreatment cleaning agent for degreasing, rust removal and film coating. Compared with traditional phosphating, the treatment area per kilogram is about 150 square meters or more, which is more than 3 times the traditional phosphating treatment area. While shortening the process flow, it also has the advantages of energy saving and environmental protection, greatly reducing the pre-treatment cost of coating. DETAILED DESCRIPTION

[0020] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0021] Example 1 First add 39.6Kg of soft water into the mixing and dispersing barrel, then add 5Kg of lactic acid, 0.2Kg of hydroxysuccinic acid, and 0.5Kg of methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually observe that it is uniform and transparent, then slowly add 1Kg of sodium hydroxide, 1Kg of sodium tripolyphosphate, 5Kg of sodium gluconate, 0.1Kg of ammonium molybdate, 1Kg of rust remover, and 1Kg of ethylene glycol under stirring, adjust the speed to 320-360 rpm, and stir for 40-50 minutes. At the same time, add 39.6Kg of soft water to control the temperature of the dispersing cylinder to ≤50°C, and finally add 1Kg of surfactant and 5Kg of OP-10 compound, and stir while adding. Adjust the speed to 300-350 rpm and stir for 30-40 minutes. Stir the solution until it is homogeneous and filter to obtain a three-in-one cleaning agent.

[0022] Example 2 First add 13.5Kg of soft water into the mixing and dispersing barrel, then add 20Kg of lactic acid, 0.3Kg of hydroxysuccinic acid, and 0.7Kg of methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually observe that it is uniform and transparent, then slowly add 5Kg of sodium hydroxide, 5Kg of sodium tripolyphosphate, 15Kg of sodium gluconate, 2Kg of ammonium molybdate, 5Kg of rust remover, and 5Kg of ethylene glycol under stirring, adjust the speed to 320-360 rpm, and stir for 40-50 minutes. At the same time, add 13.5Kg of soft water to control the temperature of the dispersing cylinder to ≤50°C, and finally add 10Kg of surfactant and 5Kg of OP-10 compound, and stir while adding. Adjust the speed to 300-350 rpm and stir for 30-40 minutes. Stir the solution until it is homogeneous and filter to obtain a three-in-one cleaning agent.

[0023] Example 3 First add 20Kg of soft water into the mixing and dispersing barrel, then add 13Kg of lactic acid, 0.3Kg of hydroxysuccinic acid, and 0.7Kg of methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually observe that it is uniform and transparent, then slowly add 6Kg of sodium hydroxide, 10Kg of sodium tripolyphosphate, 10Kg of sodium gluconate, 1Kg of ammonium molybdate, 3Kg of rust remover, and 3Kg of ethylene glycol under stirring, adjust the speed to 320-360 rpm, and stir for 40-50 minutes. At the same time, add 20Kg of soft water to control the temperature of the dispersing cylinder to ≤50°C. Finally, add 10Kg of surfactant and 3Kg of OP-10 compound, and stir while adding. Adjust the speed to 300-350 rpm and stir for 30-40 minutes. Stir the solution until it is homogeneous and filter to obtain a three-in-one cleaning agent.

[0024] Example 4 First add 15Kg of soft water into the mixing and dispersing barrel, then add 15Kg of lactic acid, 0.3Kg of hydroxysuccinic acid, and 0.7Kg of methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually observe that it is uniform and transparent, then slowly add 7Kg of sodium hydroxide, 11Kg of sodium tripolyphosphate, 11Kg of sodium gluconate, 2Kg of ammonium molybdate, 3Kg of rust remover, and 3Kg of ethylene glycol under stirring, adjust the speed to 320-360 rpm, and stir for 40-50 minutes. At the same time, add 15Kg of soft water to control the temperature of the dispersing cylinder to ≤50°C, and finally add 11Kg of surfactant and 6Kg of OP-10 compound, and stir while adding. Adjust the speed to 300-350 rpm and stir for 30-40 minutes. Stir the solution until it is homogeneous and filter to obtain a three-in-one cleaning agent.

[0025] Example 5 First add 30Kg of soft water into the mixing and dispersing barrel, then add 7Kg of lactic acid, 0.4Kg of hydroxysuccinic acid, and 0.6Kg of methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually observe that it is uniform and transparent, then slowly add 4Kg of sodium hydroxide, 6Kg of sodium tripolyphosphate, 6Kg of sodium gluconate, 1Kg of ammonium molybdate, 2Kg of rust remover, and 2Kg of ethylene glycol under stirring, adjust the speed to 320-360 rpm, and stir for 40-50 minutes. At the same time, add 30Kg of soft water to control the temperature of the dispersion tank to ≤50°C. Finally, add 6Kg of surfactant and 5Kg of OP-10 compound, and stir while adding. Adjust the speed to 300-350 rpm and stir for 30-40 minutes. Stir the solution until it is homogeneous and filter to obtain a three-in-one cleaning agent.

[0026] Example 6 First add 25Kg of soft water into the mixing and dispersing barrel, then add 8Kg of lactic acid, 0.5Kg of hydroxysuccinic acid, and 1.5Kg of methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually observe that it is uniform and transparent, then slowly add 5Kg of sodium hydroxide, 7Kg of sodium tripolyphosphate, 7Kg of sodium gluconate, 2Kg of ammonium molybdate, 3Kg of rust remover, and 3Kg of ethylene glycol under stirring, adjust the speed to 320-360 rpm, and stir for 40-50 minutes. At the same time, add 25Kg of soft water to control the temperature of the dispersing cylinder to ≤50°C, and finally add 7Kg of surfactant and 6Kg of OP-10 compound, and stir while adding. Adjust the speed to 300-350 rpm and stir for 30-40 minutes. Stir the solution until it is homogeneous and filter to obtain a three-in-one cleaning agent.

[0027] In all the above embodiments, the surfactant is alkyl sulfate and / or linear alkylbenzene sulfonate, and the pH value of the prepared cleaning agent is in the range of 6.8-7.2.

[0028] When using this environmentally friendly neutral degreasing, rust removal and rust prevention three-in-one cleaning agent for cleaning operations, you can use a spray or immersion process at room temperature. The treatment time of the spray process is 1-2 minutes, and the treatment time of the immersion process is 4-5 minutes. It is particularly important to note that when using the immersion method, in order to obtain a more uniform protective film on the metal surface, it is best to keep the cleaning liquid in a properly stirred state.

[0029] During the cleaning process, the treatment tank should be made of stainless steel or plastic. For the treatment tank made of medium carbon steel, it needs to be lined with acid-resistant coating. The pumps, pipes, nozzles and other components used should be made of acid-resistant materials such as plastic.

[0030] This environmentally friendly neutral cleaning agent needs to be stored in a fluoride-resistant hard PVC or PP plastic container. During storage, avoid high temperature environments and it is recommended to store it at room temperature.

[0031] For wastewater treatment, the working solution should be treated in accordance with the treatment requirements of the relevant chemicals. Before the rinse water or working solution is discharged into the sewer, the working solution and the sediment accumulated in the tank may contain different components from the chemicals provided, so the solution and sediment may need to be analyzed before treatment.

[0032] Wastewater treatment should follow the treatment requirements of the relevant chemicals for the working solution. Before the rinse water or working solution is discharged into the sewer, the working solution and the sediment accumulated in the tank may contain components different from the chemicals provided, and analysis of the solution and sediment may be required before treatment.

[0033] Do not allow this cleaning agent to come into contact with your skin or clothes. Wear protective gloves when using it. If the agent is spilled on your skin or clothes, rinse it directly with plenty of water. If it enters your eyes, rinse it with running water and seek medical attention.

[0034] The environmentally friendly neutral degreasing, rust removal and rust prevention three-in-one cleaning agent provided by the present invention is a neutral liquid with a pH value of 6.8 to 7.2, no residue, no surface adjustment, no accelerator, no inorganic phosphoric acid, no toxic and harmful heavy metals such as nickel, chromium, cadmium, manganese, no volatile toxic and harmful organic components, non-flammable and non-explosive. This cleaning agent is a three-in-one metal coating pretreatment cleaning agent for degreasing, rust removal and film coating; compared with traditional phosphating, the treatment area per kilogram is about 150 square meters or more, which is more than 3 times the traditional phosphating treatment area. While shortening the process flow, it also has the advantages of energy saving and environmental protection, greatly reducing the pre-treatment cost of coating.

[0035] Standard process flow of the above embodiment (1) Environmentally friendly neutral three-in-one (ultrasonic) → drying → painting, plastic spraying, electrophoresis (washing with pure water) (2) Pre-degreasing → main degreasing → water washing → environmentally friendly neutral rust inhibitor → drying → painting, plastic spraying, electrophoresis (add pure water washing) (3) Degreasing → water washing → acid washing → water washing → neutralization → water washing → environmentally friendly neutral rust inhibitor → drying → painting, plastic spraying, electrophoresis (add pure water washing) (4) High-pressure water gun (degreasing, rust removal, and oxide skin removal) → drying → painting → plastic spraying → electrophoresis (washing with pure water).

[0036] 4. Preparation of working fluid Dispensing tank (1000 liters) Spray Impregnation Environmentally friendly neutral rust inhibitor 50 kg 50 kg Fill the cleaning tank 3 / 4 full with cold water, add the appropriate amount of chemicals and stir, and add enough water to bring the solution to the working level.

[0037] 5. Process conditions Spray soak pH 6.8～7.2 6.8～7.2 Processing time 1~2min 4-5 minutes Processing temperature normal temperature normal temperature Note: When using the immersion method, it is best to keep the liquid in a properly stirred state in order to obtain a more uniform film.

[0038] The embodiments described above are preferred embodiments of the present invention, rather than all embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. An environmentally friendly neutral degreasing, rust removal and rust prevention three-in-one cleaning agent, characterized in that: The weight percentage of each component is as follows: Sodium hydroxide: 1% to 15% Sodium tripolyphosphate: 1%~20% Sodium gluconate: 5% to 20% Lactic acid: 5% ~ 30% Surfactant: 1%~20% OP-10 compound: 5% ~ 10% Ammonium molybdate: 0.1%~5% Rust remover: 1% to 10% Ethylene glycol: 1% to 15% Hydroxysuccinic acid: 0.2% to 0.5% Methylpyruvic acid: 0.5% to 1.5% Soft water: Balance.

2. The environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent according to claim 1, characterized in that: The surfactant is an alkyl sulfate and / or a linear alkyl benzene sulfonate.

3. The environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent according to claim 1, characterized in that: The surfactants are cocamidopropyl betaine and / or sodium cocoyl glutamate.

4. The environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent according to claim 1, characterized in that: The surfactant is prepared according to the mass ratio of cocamidopropyl betaine to sodium cocoyl glutamate = 1:3, and the total added amount does not exceed 5% of the total mass of the cleaning agent.

5. The environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent according to claim 1, characterized in that: The hydroxysuccinic acid is one or more of 2-hydroxysuccinic acid, 2,3-dihydroxysuccinic acid, 2-hydroxypropionic acid, 3-methylpyruvic acid, o-hydroxybenzoic acid, fumaric acid, and maleic acid.

6. The environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent according to claim 5, characterized in that: The hydroxysuccinic acid is 2-hydroxysuccinic acid or 2,3-dihydroxysuccinic acid.

7. The environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent according to claim 1, characterized in that: The mass percentage of soft water is controlled between 30% and 60%.

8. The environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent according to claim 1, characterized in that: The pH value of the cleaning agent is 6.8-7.

2.

9. A method for preparing an environmentally friendly neutral degreasing, rust removing and rust preventing three-in-one cleaning agent, characterized in that: The preparation method is carried out according to the following steps: (1) Accurately weigh each component of the cleaning agent according to its mass ratio and set aside; (2) First add half of the soft water into the mixing and dispersing tank, then add lactic acid, hydroxysuccinic acid, and methylpyruvic acid, turn on the agitator and stir slowly at a speed of 250-290 rpm. After stirring for 40-50 minutes, visually inspect the mixture to make it uniform and transparent. (3) Then slowly add sodium hydroxide, sodium tripolyphosphate, sodium gluconate, ammonium molybdate, rust remover, and ethylene glycol while stirring. Adjust the speed to 320-360 rpm and the stirring time to 40-50 minutes. (4) Add the other half of soft water to control the dispersion tank temperature to ≤50℃. (5) Finally, add the surfactant and OP-10 compound, also while stirring, adjust the speed to 300-350 rpm, and stir for 30-40 min. Stir the solution until it is homogeneous and filter it to obtain the three-in-one cleaning agent.