Cleaning agent as well as preparation method and use method thereof
By using a cleaning agent composed of trifluoromethanesulfonic acid and other components, the problem of residue after cleaning aluminum cans is solved, achieving efficient cleaning, reducing water consumption, lowering production costs, and ensuring film formation.
Patent Information
- Application Number
- CN202510942840.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-11-04
AI Technical Summary
Existing cleaning agents leave a large amount of residue after cleaning aluminum cans, requiring extensive water rinsing, increasing production costs and environmental pressure, and affecting the subsequent passivation film formation process.
The cleaning agent, composed of trifluoromethanesulfonic acid, grease solvent, lauryl alcohol polyoxyethylene ether, and high molecular weight emulsifier, achieves powerful cleaning and reduces residue through acid etching and emulsification dispersion of grease.
No rinsing is required after cleaning, reducing industrial water consumption, lowering production costs, improving production efficiency, and ensuring the smooth progress of subsequent film formation processes.
Smart Images
Figure CN120888940A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of aluminum pop can cleaning, in particular to a cleaning agent and its preparation method and use method. BACKGROUND
[0002] Aluminum pop cans are widely used in food packaging. The production process of aluminum pop cans is relatively complex, which usually includes: taking aluminum coil as raw material, cupping, thinning and stretching, cleaning, passivation film forming, printing, in-can coating, necking and flanging, testing and packaging, etc.
[0003] The cupping and thinning and stretching process of aluminum pop cans involves processes such as stretching, deformation, heating and friction wear of metal materials, and requires the use of cupping oil and stretching coolant as process lubricating medium to ensure the smooth progress of thinning and stretching. The main functions of cupping oil and stretching coolant are: providing lubrication between the can body and the process tool; absorbing heat generated during stretching; effectively preventing rust of the mold and equipment, and also playing a certain pre-cleaning role to support the subsequent cleaning process.
[0004] The existing cupping oil and stretching coolant technology, after the completion of the cupping and thinning and stretching process, the surface of the pop can will be left with some oil (a mixture of cupping oil, stretching coolant and mechanical oil) and aluminum powder (generated during cupping and thinning and stretching of aluminum coil), which must be thoroughly cleaned before surface passivation film forming to avoid affecting subsequent passivation film forming, printing and in-can coating, and to avoid affecting product quality and yield.
[0005] The existing cleaning process mainly includes the following processes: 1# tank pre-cleaning, 2# tank cleaning, 3a# tank pre-rinsing, 3b# tank rinsing, 4# tank passivation film forming, 5# tank rinsing, 6# tank rinsing, 7# tank slip agent, 5#-7# tanks are subsequent processes after passivation film forming. Among them, 1# tank and 2# tank mainly contain special cleaning agents, which mainly play the role of cleaning to wash off the surface residues of organic and inorganic substances to facilitate subsequent passivation film forming.
[0006] The existing special cleaning agent, after cleaning, will leave a large amount of cleaning agent on the surface, which will seriously affect the subsequent passivation film forming process if not washed off. Therefore, after 2# tank cleaning, two rinsing tanks must be used to thoroughly wash off the surface residues of the cleaning agent. This leads to the following serious problems that need to be solved: two rinsing tanks require a large amount of water and generate a large amount of industrial hazardous waste water, greatly increasing the production cost and also greatly increasing the environmental pressure of treating industrial hazardous waste water. SUMMARY
[0007] Therefore, the present application aims to provide a cleaning agent and a preparation method and a use method thereof.
[0008] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions.
[0009] The present application provides a cleaning agent, which comprises the following components in mass percentage:
[0010] 1-5% triflic acid, 5-10% lipid dissolving agent, 0.5-2% lauryl alcohol polyoxyethylene ether, 1-5% high molecular emulsifier, 20-30% pH regulator, and the rest water;
[0011] The lipid dissolving agent comprises methyl ethyl ketone and / or isopropyl alcohol.
[0012] The high molecular emulsifier is a polyester random copolymer polymerized from ethylene glycol and long chain fatty acid.
[0013] Preferably, the lauryl alcohol polyoxyethylene ether is AEO-30.
[0014] Preferably, the high molecular emulsifier is HYPERMER TM A256-LQ-(MV).
[0015] Preferably, the pH regulator comprises sulfuric acid.
[0016] Preferably, the water comprises deionized water.
[0017] Preferably, the pH value of the cleaning agent is 1.2-1.8.
[0018] Preferably, the use concentration of the cleaning agent is 0.1-5wt%.
[0019] The present application also provides a preparation method of the cleaning agent described in the above technical solutions, which comprises the following steps:
[0020] Mixing triflic acid, a lipid dissolving agent, lauryl alcohol polyoxyethylene ether, a high molecular emulsifier, a pH regulator and water to obtain the cleaning agent.
[0021] The present application also provides a use method of the cleaning agent described in the above technical solutions, which comprises the following steps:
[0022] Diluting the cleaning agent described in the above technical solutions and then using it.
[0023] Preferably, the diluent comprises water.
[0024] The present application provides a cleaning agent.
[0025] The cleaning agent of the present application takes trifluoromethanesulfonic acid as an acid etchant, and is used for cleaning aluminum powder; lauryl alcohol polyoxyethylene ether and a high-molecular emulsifier disperse grease through emulsification, so as to achieve the purpose of cleaning grease. The cleaning agent of the present application is a water-based strong acid cleaning agent, has strong cleaning ability for grease and aluminum powder, has little residue after cleaning, has good film-forming property after cleaning, and can therefore eliminate subsequent rinsing process, effectively reduce industrial water, reduce wastewater discharge, be more energy-saving and environment-friendly, effectively reduce production cost, and improve production efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 A dynamic surface tension DST test result graph for the cleaning obtained in Example 1 and Comparative Example 6;
[0027] Figure 2 A structure formula graph of HYPERMER TM A256-LQ-(MV). DETAILED DESCRIPTION
[0028] The present application provides a cleaning agent, which comprises the following components in mass percentage:
[0029] 1-5% of trifluoromethanesulfonic acid, 5-10% of a fat-soluble agent, 0.5-2% of lauryl alcohol polyoxyethylene ether, 1-5% of a high-molecular emulsifier, 20-30% of a pH adjuster, and the balance of water;
[0030] The fat-soluble agent comprises methyl ethyl ketone and / or isopropyl alcohol.
[0031] The high-molecular emulsifier is a polyester random copolymer polymerized from ethylene glycol and long-chain fatty acid.
[0032] Unless otherwise specified, the raw materials used in the present application are preferably commercially available products.
[0033] The cleaning agent provided by the present application comprises 1-5% of trifluoromethanesulfonic acid (CF3-SO3H) in mass percentage, and is specifically preferably 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%. In the present application, the trifluoromethanesulfonic acid functions as an acid etchant, and is used for cleaning aluminum powder.
[0034] The cleaning agent provided by the present application comprises 5-10% of a fat dissolving agent, preferably 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10% in terms of mass percentage. In the present application, the fat dissolving agent comprises methyl ethyl ketone (MEK) and / or isopropyl alcohol (IPA), preferably methyl ethyl ketone. In the present application, methyl ethyl ketone (MEK) and / or isopropyl alcohol (IPA) is used as the fat dissolving agent to clean grease.
[0035] The cleaning agent provided by the present application comprises 0.5-2% of lauryl alcohol polyoxyethylene ether, preferably 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9% or 2% in terms of mass percentage. In the present application, the lauryl alcohol polyoxyethylene ether is preferably AEO-30. In the present application, the lauryl alcohol polyoxyethylene ether is used to emulsify and disperse grease to clean grease.
[0036] The cleaning agent provided by the present application comprises 1-5% of a high-molecular emulsifier, preferably 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5% in terms of mass percentage. In the present application, the high-molecular emulsifier is a polyester random copolymer polymerized from ethylene glycol and long-chain fatty acid. In a specific embodiment of the present application, the high-molecular emulsifier is preferably a product belonging to the Hyper A2 series, preferably HYPERMER TM A256-LQ-(MV). The manufacturer or supplier of the high-molecular emulsifier is Shanghai Hwamy Chemical Co., Ltd. In the present application, the high-molecular emulsifier is used to emulsify and disperse grease to clean grease.
[0037] In the present application, the HYPERMER TM A256-LQ-(MV) has a structure as shown in Figure 2 .
[0038] The cleaning agent provided by the present application comprises 20-30% of a pH regulator, preferably 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30% in terms of mass percentage. In the present application, the pH regulator preferably comprises sulfuric acid. In the present application, the mass concentration of the sulfuric acid is preferably 45-55%, further preferably 50%. In the present application, the pH regulator is used to regulate the pH of the cleaning agent.
[0039] The cleaning agent provided by the present application comprises water in the rest amount; the water preferably comprises deionized water.
[0040] In the present application, the pH value of the cleaning agent is preferably 1.2-1.8.
[0041] In the present application, the use concentration of the cleaning agent is preferably 0.1-5wt%, and particularly preferably 0.1wt%, 0.2wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt% or 5wt%.
[0042] The present application also provides a preparation method of the cleaning agent described in the above technical solution, comprising the following steps:
[0043] Mixing triflic acid, a fat-dissolving agent, lauryl alcohol polyoxyethylene ether, a high-molecular emulsifier, a pH regulator and water to obtain the cleaning agent.
[0044] The present application does not make specific limitations on the mixing method.
[0045] The present application also provides a use method of the cleaning agent described in the above technical solution, comprising the following steps:
[0046] Diluting the cleaning agent described in the above technical solution and then using it.
[0047] In the present application, the diluent for dilution preferably comprises water, and the water preferably comprises deionized water.
[0048] In the present application, the dilution multiple preferably coincides with the use concentration of the cleaning agent described in the above technical solution, and will not be described here again.
[0049] The cleaning agent, the preparation method and the use method thereof provided by the present application will be described in detail below in combination with examples, but they should not be understood as limitations on the protection scope of the present application.
[0050] Examples and Comparative Examples
[0051] The formula of each cleaning agent in the examples and the comparative examples is shown in Table 1. Among them, the mass concentration of sulfuric acid is 50%.
[0052] Table 1 Formula of cleaning agent in Example and Comparative Example 1
[0053]
[0054]
[0055] At the same time, the commercially available cleaning agent with model number UNICLEAN 576 / F136 is used as Comparative Example 6.
[0056] The performance of each cleaning agent is tested:
[0057] The use concentration of the cleaning agents obtained in Examples 1 to 3 and Comparative Examples 1 to 5 was 0.3%, i.e. 0.3 parts by weight of the original solution of the cleaning agent to be tested was added to 99.7 parts by weight of water to form a 0.3 wt% dilute solution for subsequent testing.
[0058] The use concentration of the commercially available cleaning agent UNICLEAN 576 / F136 in Comparative Example 6 was 2%, i.e. 2 parts by weight of the original solution of the cleaning agent UNICLEAN 576 / F136 was added to 98 parts by weight of water to form a 2 wt% dilute solution for subsequent testing.
[0059] 1. Grease cleaning performance
[0060] The standard panel was QPanel Al standard panel Type A (3003H14).
[0061] The simulated grease was prepared by mixing pre-coated oil (UNICOAT PL9611), cup lubricating oil (UNICOAT CP360) and mineral oil 250SN in a mass ratio of 3:2:2 at 40°C for 30 minutes and then cooling.
[0062] Preparation of the sample to be tested: the test panel was immersed in the simulated grease for 5 minutes, then taken out and hung on a rack to drip dry naturally for 24 hours to obtain a sample to be tested containing grease, which was used to simulate the easy-open can to be cleaned in the field.
[0063] Test method: the sample to be tested was placed in the cleaning agent in a 60°C water bath, and every 15 seconds it was taken out to observe whether the water film was continuous. If the water film was continuous, it meant that the cleaning was complete. Thus, the time T (cleaning) required for cleaning was obtained.
[0064] 2. Aluminium powder cleaning performance
[0065] The standard panel was QPanel Al standard panel Type A (3003H14).
[0066] Test method: the standard panel was immersed in the cleaning agent in a 60°C water bath for 30 minutes. Then the standard panel was taken out and the concentration of Al ions in the solution was determined by ICP-OES method. The higher the concentration, the better the etching performance of the cleaning agent on the aluminium panel and the better the cleaning performance of the cleaning agent on the aluminium powder.
[0067] 3. Cleaning agent residue performance
[0068] The standard panel was QPanel Al standard panel Type A (3003H14).
[0069] Test method: Immerse the standard plate in cleaning agent in a 60℃ water bath for 2 minutes. Then remove the standard plate and hang it to air dry. Weigh the initial weight W0 using a high-precision 4-position balance. Then place it in a 600℃ muffle oven and bake for 4 hours. Remove it and place it in a desiccator for 4 hours, then weigh it again to reset W1.
[0070] Weight difference Wr = W1 - W0 = residual cleaning agent. The larger the Wr value, the more cleaning agent residue there is.
[0071] 4. Film-forming properties after cleaning, in mg / m³ 2
[0072] The test sample is a QPanelAl standard board Type A (3003H14).
[0073] The specifications of the simulated grease are as follows: pre-coating oil (brand name UNICOAT PL9611), cup lubricating oil (UNICOAT CP360) and mineral oil 250SN. The three are mixed at a mass ratio of 3:2:2 at 40°C for 30 minutes and then cooled for later use.
[0074] Film-forming agent: Commercially available sample UNICOAT420RE
[0075] Preparation of test samples: Immerse the test sample in simulated grease for 5 minutes, then remove it and hang it on a rack to air dry naturally for 24 hours to obtain test samples containing grease, which are used to simulate aluminum cans to be cleaned on site.
[0076] Test method: Immerse the sample in cleaning agent and bathe in a 60°C water bath for 2 minutes. Then, immerse it directly in a diluted film-forming agent solution (prepared by mixing 2 parts by weight of commercially available film-forming agent UNICOAT 420RE and 98 parts by weight of water) and bathe in a 50°C water bath for 1 minute. Afterward, remove the sample and place it directly in an 80°C oven for 1 minute. Then, use a handheld XRF analyzer to determine the Zr content on the sample surface. Higher Zr content indicates better film-forming performance.
[0077] The test results of the cleaning agents obtained in each embodiment and comparative example are shown in Table 2.
[0078] Table 2. Performance test results of the cleaning agents obtained in each embodiment and comparative example.
[0079]
[0080] From Table 2, it can be seen that: comparative example 1 and comparative example 1, comparative example 1 replaces AEO-30 with AEO-9, the cleaning agent residue increases greatly, the film forming property is poor, and it cannot be rinsed free; comparative example 1 and comparative example 2, comparative example 2 does not add trifluoromethanesulfonic acid, the cleaning ability of aluminum powder is reduced; comparative example 1 and comparative example 3, comparative example 3 does not add methyl ethyl ketone, which reduces the cleaning ability of the cleaning agent for oil and fat, and also increases the cleaning agent residue, thereby seriously affecting film forming. Comparative example 1 and comparative example 4, comparative example 4 does not add AEO-30, which affects the cleaning ability of oil and fat, thereby affecting film forming, but is beneficial to residue. Comparative example 1 and comparative example 5, comparative example 5 does not add high molecular emulsifier Croda A256, which affects the cleaning ability of oil and fat, thereby affecting film forming; but effectively reduces the residue. Compared with the commercially available cleaning agent, the cleaning agent of the application can achieve the same cleaning effect with a lower concentration. The cleaning agent of the application has a lower DST, indicating better cleaning performance. The cleaning agent of the application can achieve the same oil and fat cleaning effect with a lower concentration of 0.3 wt%; if the same concentration as the commercially available cleaning agent is used, the oil and fat cleaning effect is better; the cleaning agent of the application is rinsed free, and the concentration of the application itself is compared, that is, 2% vs. 0.3%, the residue will increase slightly, but it is also far less than the residue of the ordinary product at a concentration of 2%, and it does not affect film forming, and does not need to be rinsed. The cleaning agent of the application can achieve the same aluminum powder cleaning effect with a lower concentration of 0.3 wt%; if the same concentration as the commercially available cleaning agent is used, the aluminum powder cleaning effect is better. The cleaning agent of the application has very low residue, thereby achieving rinsing free. The cleaning agent of the application can directly form a film after cleaning, and the existing cleaning agent cannot form a film after cleaning.
[0081] Figure 1 The dynamic surface tension DST test results of the cleaned samples of example 1 (corresponding to the product of the application in the figure) and comparative example 6 (corresponding to the commercially available product currently used in the figure) are shown in the figure from Figure 1 It can be seen that: the cleaning agent of the application has a lower dynamic surface tension (DST), and has better cleaning performance.
[0082] The above is only a preferred embodiment of the application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the application, and these improvements and refinements should also be considered within the scope of protection of the application.
Claims
1. A cleaning agent, characterized in that, Includes the following components by mass percentage: Trifluoromethanesulfonic acid 1-5%, lipid solvent 5-10%, lauryl alcohol polyoxyethylene ether 0.5-2%, polymeric emulsifier 1-5%, pH adjuster 20-30%, balance water; The lipid solvent includes methyl ethyl ketone and / or isopropanol; The polymeric emulsifier is a polyester random copolymer polymerized from ethylene glycol and long-chain fatty acids.
2. The cleaning agent according to claim 1, characterized in that, The lauryl alcohol polyoxyethylene ether is AEO-30.
3. The cleaning agent according to claim 1, characterized in that, The polymeric emulsifier is HYPERMER. TM A256-LQ-(MV).
4. The cleaning agent according to claim 1, characterized in that, The pH adjuster includes sulfuric acid.
5. The cleaning agent according to claim 1, characterized in that, The water includes deionized water.
6. The cleaning agent according to claim 1, characterized in that, The pH value of the cleaning agent is 1.2 to 1.
8.
7. The cleaning agent according to any one of claims 1 to 6, characterized in that, The concentration of the cleaning agent used is 0.1–5 wt%.
8. A method for preparing the cleaning agent according to any one of claims 1 to 7, characterized in that, Includes the following steps: The cleaning agent is obtained by mixing trifluoromethanesulfonic acid, grease solvent, lauryl alcohol polyoxyethylene ether, polymeric emulsifier, pH adjuster and water.
9. The method of using the cleaning agent according to any one of claims 1 to 7, characterized in that, Includes the following steps: The cleaning agent according to any one of claims 1 to 7 is used after dilution.
10. The method of use according to claim 9, characterized in that, The diluent used for dilution includes water.