Special bubble-free spraying cleaning agent for aluminum pot and preparation method of special bubble-free spraying cleaning agent

Abstract

The invention belongs to the field of cleaning agents, and particularly relates to a special bubble-free spraying cleaning agent for aluminum cans and a preparation method of the special bubble-free spraying cleaning agent. The special bubble-free spraying cleaning agent for the aluminum pot is prepared from the following raw materials in parts by mass: 15 to 30 parts of inorganic alkali, 2 to 8 parts of alkyl carboxylic acid soap compound, 1 to 5 parts of organic alcohol amine, 0.1 to 3 parts of corrosion inhibitor, 1 to 5 parts of nitrate, 0.1 to 2 parts of wetting agent, 1 to 5 parts of PEG (Polyethylene Glycol) and 10 to 80 parts of water. The cleaning agent provided by the invention has low-foam performance, can effectively clean zinc stearate on the surface of the aluminum pot after being used, has an excellent cleaning effect, and fills the corresponding technical blank in China.

Description

Technical Field

[0001] The present invention belongs to the field of cleaning agents, and particularly relates to a foam-free special spray cleaning agent for aluminum cans and a preparation method thereof. Background Art

[0002] Aluminum cans have excellent sealing and freshness preservation properties and are currently widely used in multiple fields. In food packaging, aluminum cans are commonly used to load dry foods such as biscuits and chocolates, as well as beverages such as soda and beer, to ensure the freshness and safety of the food. At the same time, aluminum cans are also suitable for pharmaceutical packaging, especially small aluminum cans, which can effectively protect the quality and safety of drugs. In addition, aluminum cans are ideal packaging containers for cosmetics and are widely used in the fields of skin care products and makeup, such as spray-type skin toners, facial cleansers, cream-based facial creams, and facial masks. However, various lubricating functional aids are used in the production process of aluminum cans to improve production efficiency and obtain a beautiful appearance. However, these lubricating aids, as well as other impurities such as equipment oil stains and dust, may remain on the surface after the aluminum cans are formed, affecting the appearance, performance, and subsequent processing quality, such as the coating adhesion and the aesthetics of the coating. Therefore, thorough cleaning is required to remove these residues and impurities, reduce the corrosion risk, extend the service life of the aluminum cans, and ensure that they meet relevant standards and requirements.

[0003] Chinese Patent CN114934277B discloses a recyclable cleaning agent for aluminum cans and a preparation method thereof. The main raw materials for preparing this cleaning agent mainly include alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, modified oil ethoxylate, defoaming agent, acid, and corrosion and scale inhibitor. By combining these three surfactants, namely alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, and modified oil ethoxylate, this cleaning agent can effectively degrease and remove various oil stains generated during the production of aluminum cans, and the addition of the defoaming agent ensures that the product has low-foam properties.

[0004] Zinc stearate, as an efficient lubricant, is often used for coating on the surface of aluminum products before surface forming processing due to its lubricity, easy coating property, and non-toxic and harmless characteristics. It can not only reduce the friction between the aluminum material and the mold, promote the smooth demolding of the aluminum can, but also ensure the smoothness and uniformity of the aluminum can surface, and at the same time enhance the corrosion resistance of the aluminum can. However, currently, the aluminum can cleaning agents on the market mainly focus on cleaning the oil stains on the surface of aluminum cans, and there are relatively few reports on cleaning zinc stearate on the surface of aluminum cans, especially low-foam zinc stearate cleaning agents are scarce. Therefore, how to effectively provide a low-foam cleaning agent suitable for cleaning zinc stearate on the surface of aluminum cans without additionally using a defoaming agent and replace imported products has become a technical problem that needs to be solved urgently at present. Summary of the Invention

[0005] The first aspect of the present invention provides a special spray cleaning agent for non-foaming aluminum cans. The raw materials for its preparation, calculated by weight, include 15-30 parts of inorganic base, 2-8 parts of alkyl carboxylic acid soap compounds, 1-5 parts of organic alcohol amines, 0.1-3 parts of corrosion inhibitors, 1-5 parts of nitrates, 0.1-2 parts of wetting agents, 1-5 parts of PEG, and 10-80 parts of water.

[0006] As an implementable example, the inorganic base includes one or more of sodium hydroxide, potassium hydroxide, and lithium hydroxide.

[0007] The aluminum can cleaning agents currently on the market are mainly compounded with surfactants of different physical properties for cleaning. However, this type of cleaning agent has a relatively poor cleaning effect on zinc stearate on the surface of the aluminum can. The present invention creatively uses inorganic alkali, especially inorganic strong alkali, as the main component of the cleaning agent, which not only enhances the saponification ability, but also can effectively decompose zinc stearate and other oily substances, converting them into water-soluble substances, which is convenient for subsequent cleaning and rinsing; it also improves the solubility of stains, reduces the adhesion of stains on the surface of the aluminum can, and makes the cleaning more thorough. At the same time, in an alkaline environment, stains such as zinc stearate are more likely to react with the chemical components of the cleaning solution to generate products that are easy to remove. In addition, under appropriate concentrations and treatment conditions, the inorganic strong alkali solution can form a layer of hydroxide protective film on the surface of the aluminum can to prevent further corrosion of the aluminum can, and can remove surface defects such as oil stains and oxide scale on the surface of the aluminum can by cleaning, making the surface of the aluminum can smoother and neater. When cleaning the zinc stearate on the surface of the aluminum can, a high concentration of inorganic alkali will react violently with aluminum, generate a large amount of gas, cause aluminum to be over-corroded, and thus lose its metallic luster, and may also generate a large amount of stearate precipitates that are difficult to remove, increasing the difficulty of cleaning. At the same time, excessive inorganic alkali will remain on the surface of the aluminum can, slowly corroding the aluminum in subsequent use, thereby causing perforation of the aluminum can and losing its use value. Therefore, the present invention preferably contains 15-30 parts of inorganic alkali in the system, which can efficiently clean the zinc stearate component without corroding the aluminum can.

[0008] As an implementable example, the brands of the alkyl carboxylic acid soap compounds include XPH 109 (available from Luoyang Xipeng Environmental Protection Technology Co., Ltd.) and / or DX-NF 109 (available from Guangzhou Dexu New Materials Co., Ltd.).

[0009] Alkyl carboxylic acid soap compounds are composed of an alkyl chain containing 10 to 20 carbon atoms and a carboxylic acid group combined with cations such as alkali metals or ammonium. They are both hydrophilic and hydrophobic, and can form micelle structures in water, effectively reducing surface tension, thereby achieving efficient cleaning and strong decontamination. At the same time, alkyl carboxylic acid soap compounds can also inhibit the generation of foam to a certain extent.

[0010] When alkyl carboxylate soap compounds are applied to the cleaning of zinc stearate on the surface of aluminum cans, they effectively remove dirt by forming chemical bonds or physical adsorption with dirt such as zinc stearate. In addition, their micelle structure can prevent the dirt from redepositing on the surface of the aluminum can. When acting synergistically with inorganic bases, alkyl carboxylate soap compounds can further promote the dissolution of zinc stearate, significantly improving the cleaning efficiency and quality. More importantly, due to the low-foaming property of alkyl carboxylate soap compounds themselves, there is no need to additionally use functional auxiliaries such as defoamers in the cleaning agent, thus reducing the production cost of the product and preventing poor adhesion of the bottom coating caused by defoamer residues.

[0011] As an implementable case, the organic alkanolamines include one or more of isopropanolamine, diisopropanolamine, triisopropanolamine, monoethanolamine, diethanolamine, triethanolamine, and methylethanolamine.

[0012] The organic alkanolamines act synergistically with inorganic bases, significantly increasing the alkalinity of the cleaning solution, effectively enhancing the dissolution and peeling ability of zinc stearate, and making the cleaning process more efficient. At the same time, the presence of alkyl carboxylate soap compounds reduces the surface tension of the cleaning solution, enabling it to easily penetrate into the tiny gaps on the surface of the aluminum can, fully contact with zinc stearate, and effectively disperse it into the cleaning agent through emulsification, dispersion, and solubilization, preventing its redeposition. The organic alkanolamines themselves also have certain wetting and dispersing properties, which can enhance the wettability and permeability of the cleaning solution to the surface of the aluminum can, ensuring the uniformity and thoroughness of cleaning. More importantly, after the organic alkanolamines act synergistically with the corrosion inhibitor, a protective film can be formed on the surface of the aluminum can, effectively preventing components such as strong alkalis in the cleaning agent from corroding or damaging the aluminum can.

[0013] In the present invention, the synergistic action among the four components of organic alkanolamines, corrosion inhibitors, alkyl carboxylate soap compounds, and inorganic bases not only improves the cleaning efficiency and quality but also ensures the environmental protection and safety of the cleaning process.

[0014] As an implementable case, the corrosion inhibitors include one or more of caprylic capric acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, and organic tricarboxylic acids.

[0015] As an implementable case, the grades of the organic tricarboxylic acids include CP-50 (available from: Shanghai Milin Chemical Co., Ltd.), TAT730 (available from: Hangzhou Lupu Chemical Technology Co., Ltd.), IRGACOR L190 PLUS (available from: BASF SE), and 2,4,6-tris(aminohexanoyl)-1,3,5-triazine, etc.

[0016] The CAS number of the 2,4,6-tris(aminohexanoyl)-1,3,5-triazine is 80584-91-4; the structural formula is:

[0017]

[0018] The corrosion inhibitor can effectively reduce the corrosion rate of inorganic alkali on the surface of the aluminum can, thereby protecting the appearance uniformity and mechanical properties of the aluminum can. In the present invention, the composition of the corrosion inhibitor is particularly limited to include one or more of caprylic capric acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, and organic tricarboxylic acid, and these substances all have excellent corrosion inhibition effects. However, if other types of corrosion inhibitors are selected, such as acetic acid with a short carbon chain, the corrosion inhibition performance will decline. This is mainly because aluminum is an active metal, and the compatibility of acetic acid with aluminum materials is relatively poor, and it is easy to react with the acid to generate hydrogen and accelerate the corrosion process. Although acetic acid is less corrosive than some strong acids, it may still cause certain damage to the surface of the aluminum can during the cleaning process. In addition, acetic acid cannot react with aluminum in a strong alkaline environment to form aluminum acetate, deposit on the surface of the aluminum can to form a uniform protective layer, thereby playing a corrosion inhibition role, nor can it effectively prevent the strong corrosion of strong alkali on aluminum, but may accelerate local corrosion, thereby affecting the cleaning effect of the cleaning agent.

[0019] As an implementable case, the nitrate includes one or more of sodium nitrate, lithium nitrate, potassium nitrate, and ammonium nitrate.

[0020] Nitrate has an anodic type corrosion inhibition characteristic, can form a protective film on the surface of the aluminum can, slow down the chemical reaction between the inorganic alkali in the cleaning agent and the aluminum can, and protect the aluminum can from corrosion. At the same time, nitrate acts synergistically with the inorganic alkali to enhance the overall cleaning effect of the cleaning agent on zinc stearate, improve the stability and service life of the cleaning agent, and make the cleaning agent more suitable for the cleaning requirements of zinc stearate on the surface of the aluminum can.

[0021] As an implementable case, the wetting agent includes Miranol JEM Conc (sodium alkylaminopropionate, available from: Foshan Ferroly Trading Co., Ltd.) or TUGER JC 40 (available from: Shanghai Zhongxi Chemical Co., Ltd.).

[0022] The wetting agent can significantly reduce the surface tension of the cleaning agent, improve the wettability of the cleaning system, enable the active components of the cleaning agent to penetrate more quickly into the contact surface between the oil stain and the aluminum material, and at the same time can also enhance the cleaning effect and accelerate the decomposition of dirt, thereby improving the cleaning efficiency and shortening the cleaning time. At the same time, the wetting agent can also protect the surface of the aluminum can from corrosion and achieve an efficient and environmentally friendly cleaning process by improving the overall performance of the cleaning agent. In the present invention, the wetting agent is further limited to include Miranol JEM Conc (sodium alkylaminopropionate) or TUGER JC 40, and both wetting agents are low-foam or non-foam systems, and can endow the cleaning agent with better low-foam performance after use.

[0023] As an implementable case, the PEG includes one or more of PEG-200, PEG-300, PEG-400, PEG-600, PEG-800, and PEG-1000.

[0024] PEG can be used as a surfactant in the aluminum can cleaning agent for cleaning zinc stearate, significantly improving wettability and reducing surface tension, effectively penetrating the surface of the aluminum can to remove dirt; at the same time, it also has the function of dispersing and suspending zinc stearate residues, preventing redeposition, and providing anti-corrosion protection by forming a protective film; in addition, PEG can also increase the viscosity and lubricity of the cleaning agent, reduce frictional damage, and improve the stability and consistency of the cleaning agent. However, PEG with too large an average molecular weight, such as PEG-1500, should not be selected, mainly because in an alkaline system with the presence of inorganic alkali, the ether bond in the molecule of long-chain PEG will be attacked by OH - attack, resulting in the occurrence of hydrolysis reaction, and the alkaline condition will also accelerate the hydrolysis rate of long-chain PEG, thus causing the cleaning effect of the cleaning agent to slowly decline with the increase of the use cycle.

[0025] The second aspect of the present invention provides a preparation method of a foam-free special spray cleaning agent for aluminum cans, including

[0026] S1. Mix the corrosion inhibitor and organic alkanolamine, and stir and react for 1-3 h to obtain an intermediate;

[0027] S2. Add water, inorganic alkali, alkyl carboxylate soap compound, nitrate, wetting agent, and PEG to the intermediate, and stir evenly to obtain the product.

[0028] Beneficial effects

[0029] (1) The cleaning agent provided by the present invention uses inorganic alkali as the main component, significantly enhancing the saponification ability, effectively decomposing oil-based substances such as zinc stearate, and converting them into water-soluble substances, facilitating subsequent cleaning and rinsing; not only improving the solubility of stains, reducing the adhesion of stains on the surface of aluminum cans, making the cleaning more thorough, but also further improving the cleaning efficiency by generating products that are easy to remove.

[0030] (2) The alkyl carboxylate soap compound (such as: XPH 109 or DX-NF 109) used in the cleaning agent provided by the present invention has low foam performance, and there is no need to additionally use functional auxiliaries such as defoamers, thereby reducing the production cost of the product and improving the adhesion of subsequent primer coating and topcoat. At the same time, the alkyl carboxylate soap compound can also inhibit the generation of foam to a certain extent, prevent the phenomenon of foam overflow in the equipment cleaning agent during the cleaning process, and avoid problems such as uneven cleaning or extended cleaning time caused by excessive foam.

[0031] (3) In the present invention, the organic alkanolamine can cooperate with the inorganic base, which not only enhances the alkalinity of the cleaning solution, strengthens the dissolution and stripping ability of zinc stearate, but also enhances the wettability and permeability of the cleaning solution to the surface of the aluminum can through its wetting and dispersing properties, ensuring the uniformity and thoroughness of cleaning. In addition, the complex formed by the organic alkanolamine and the corrosion inhibitor can also form a protective film on the surface of the aluminum can, effectively preventing components such as inorganic strong bases in the cleaning agent from corroding or damaging the aluminum can.

[0032] (4) Selecting a specific corrosion inhibitor as one of the preparation raw materials in the present invention can effectively slow down the corrosion rate of the inorganic base on the surface of the aluminum can, protect the uniformity of the appearance of the aluminum can and improve the gloss of the aluminum can. At the same time, the complex formed by the corrosion inhibitor and the organic alkanolamine can also form a protective film with the surface of the aluminum can, slowing down the corrosion rate of components such as inorganic bases in the cleaning agent to aluminum, reducing the mass loss of the aluminum can, and thus extending the service life of the aluminum can.

[0033] (5) In the present invention, the addition of the wetting agent and PEG further improves the overall performance of the cleaning agent. The wetting agent can significantly reduce the surface tension of the cleaning agent, enabling the active ingredients of the cleaning agent to penetrate more quickly into the contact surface between the oil stain and the aluminum material, thereby enhancing the cleaning effect and accelerating the decomposition of dirt. And PEG, as a surfactant, can significantly improve the wettability and reduce the surface tension, effectively penetrate the surface of the aluminum can to remove dirt, and has the function of dispersing and suspending the zinc stearate residue to prevent redeposition. At the same time, both the wetting agent and the alkyl carboxylate soap compounds are low-foam or non-foam systems, which can endow the cleaning agent with better low-foam performance after use, realizing an efficient and environmentally friendly cleaning process.

[0034] (6) The cleaning agent provided by the present invention can effectively clean the zinc stearate on the surface of the aluminum can, can replace the same type of imported products, and fills the domestic related technical gap. Description of the Drawings

[0035] Figure 1 Schematic diagram of the test result of the 56# dyno pen for Example 1.

[0036] Figure 2 Schematic diagram of the test result of the breakdown current for Example 1.

[0037] Figure 3 Schematic diagram of the test result of the 56# dyno pen for Example 2.

[0038] Figure 4 Schematic diagram of the test result of the breakdown current for Example 2.

[0039] Figure 5 Schematic diagram of the test result of the 56# dyno pen for Example 3.

[0040] Figure 6 Schematic diagram of the test result of the breakdown current for Example 3.

[0041] Figure 7 Schematic diagram of the test results of the 56# dyno pen for Comparative Example 1.

[0042] Figure 8 Schematic diagram of the breakdown current test results for Comparative Example 1.

[0043] Figure 9 Schematic diagram of the test results of the 56# dyno pen for Comparative Example 2.

[0044] Figure 10 Schematic diagram of the breakdown current test results for Comparative Example 2.

[0045] Figure 11 Schematic diagram of the test results of the 56# dyno pen for Comparative Example 3.

[0046] Figure 12 Schematic diagram of the breakdown current test results for Comparative Example 3. Detailed implementation method

[0047] Example 1

[0048] In the first aspect of this example, a bubble-free special spray cleaning agent for aluminum cans is provided. The preparation raw materials are as follows by mass fraction: 15 parts of inorganic base, 3 parts of alkyl carboxylate soap compound, 2 parts of organic alkanolamine, 1 part of corrosion inhibitor, 1 part of nitrate, 0.5 part of wetting agent, 3 parts of PEG, and 74.5 parts of water.

[0049] The inorganic base is sodium hydroxide and potassium hydroxide, and the mass ratio of sodium hydroxide to potassium hydroxide is 1:10.

[0050] The alkyl carboxylate soap compounds are XPH 109 and DX-NF 109, and the mass ratio of the alkyl carboxylate soap compound of XPH 109 to the alkyl carboxylate soap compound of DX-NF 109 is 1:10; the alkyl carboxylate soap compound of XPH 109 is purchased from Luoyang Xipeng Environmental Protection Technology Co., Ltd.; the alkyl carboxylate soap compound of DX-NF 109 is purchased from Guangzhou Dexu New Materials Co., Ltd.

[0051] The organic alkanolamine is monoethanolamine and triethanolamine, and the mass ratio of monoethanolamine to triethanolamine is 1:5.

[0052] The corrosion inhibitor is sebacic acid and TAT730, and the mass ratio of sebacic acid to TAT730 is 1:2; among them, TAT730 is purchased from Hangzhou Lupu Chemical Technology Co., Ltd.

[0053] The nitrate is sodium nitrate.

[0054] The brand of the wetting agent is Miranol JEM Conc (sodium alkylaminopropionate), which is purchased from Foshan Ferroli Trading Co., Ltd.

[0055] The PEGs are PEG-200 and PEG-400, the mass ratio of PEG-200 to PEG-400 is 1:4, and both are purchased from Dow Chemical Company.

[0056] The second aspect of this example provides a method for preparing a non-foaming spray cleaning agent for aluminum cans, specifically:

[0057] S1, mixing the corrosion inhibitor and the organic alcohol amine, stirring and reacting for 1 hour to obtain an intermediate;

[0058] S2. Add water, inorganic base, alkyl carboxylic acid soap compound, nitrate, wetting agent and PEG to the intermediate and stir evenly to obtain the product.

[0059] Example 2

[0060] The first aspect of this example provides a special spray cleaning agent for non-foaming aluminum cans. The raw materials for its preparation are calculated by weight and are specifically: 18 parts of inorganic base, 5 parts of alkyl carboxylic acid soap compounds, 3 parts of organic alcohol amines, 2 parts of corrosion inhibitors, 5 parts of nitrates, 0.2 parts of wetting agents, 2 parts of PEG, and 64.8 parts of water.

[0061] The inorganic base is lithium hydroxide and potassium hydroxide, and the mass ratio of lithium hydroxide to potassium hydroxide is 1:20.

[0062] The brand of the alkyl carboxylic acid soap compound is DX-NF 109, which is purchased from Guangzhou Dexu New Materials Co., Ltd.

[0063] The organic alcohol amines are triethanolamine and isopropanolamine, and the mass ratio of triethanolamine to isopropanolamine is 4:1.

[0064] The corrosion inhibitor is octanoic acid and 2,4,6-tris(aminocaproic acid)-1,3,5-triazine, and the mass ratio of octanoic acid and 2,4,6-tris(aminocaproic acid)-1,3,5-triazine is 1:8.

[0065] The nitrates are lithium nitrate and potassium nitrate, and the mass ratio of lithium nitrate to potassium nitrate is 1:3.

[0066] The brand of the wetting agent is TUGER JC 40, which is purchased from Shanghai Zhongxi Chemical Co., Ltd.

[0067] The PEGs are PEG-200 and PEG-600, the mass ratio of PEG-200 to PEG-600 is 5:1, and both are purchased from Dow Chemical Company.

[0068] The second aspect of this example provides a method for preparing a non-foaming spray cleaning agent for aluminum cans, specifically:

[0069] S1, mixing the corrosion inhibitor and the organic alcohol amine, reacting for 1 hour, to obtain an intermediate;

[0070] S2. Add water, inorganic base, alkyl carboxylic acid soap compound, nitrate, wetting agent and PEG to the intermediate and stir evenly to obtain the product.

[0071] Example 3

[0072] The first aspect of this example provides a special spray cleaning agent for non-foaming aluminum cans. The raw materials for its preparation are calculated by weight and are specifically: 18 parts of inorganic base, 5 parts of alkyl carboxylic acid soap compounds, 3 parts of organic alcohol amines, 2 parts of corrosion inhibitors, 5 parts of nitrates, 0.2 parts of wetting agents, 2 parts of PEG, and 64.8 parts of water.

[0073] The inorganic alkali is lithium hydroxide and potassium hydroxide, and the mass ratio of sodium hydroxide to potassium hydroxide is 1:15.

[0074] The brand of the alkyl carboxylic acid soap compound is XPH 109, which is purchased from Luoyang Xipeng Environmental Protection Technology Co., Ltd.

[0075] The organic alcohol amines are triethanolamine and methylethanolamine, and the mass ratio of triethanolamine to methylethanolamine is 5:1.

[0076] The corrosion inhibitor is sebacic acid and 2,4,6-tris(aminocaproic acid)-1,3,5-triazine, and the mass ratio of sebacic acid to 2,4,6-tris(aminocaproic acid)-1,3,5-triazine is 1:8.

[0077] The nitrates are lithium nitrate and potassium nitrate, and the mass ratio of lithium nitrate to potassium nitrate is 1:3.

[0078] The brand of the wetting agent is TUGER JC 40, which is purchased from Shanghai Zhongxi Chemical Co., Ltd.

[0079] The PEGs are PEG-200 and PEG-600, the mass ratio of PEG-200 to PEG-600 is 5:1, and both are purchased from Dow Chemical Company.

[0080] The second aspect of this example provides a method for preparing a non-foaming spray cleaning agent for aluminum cans, specifically:

[0081] S1, mixing the corrosion inhibitor and the organic alcohol amine, stirring and reacting for 1 hour to obtain an intermediate;

[0082] S2. Add water, inorganic base, alkyl carboxylic acid soap compound, nitrate, wetting agent and PEG to the intermediate and stir evenly to obtain the product.

[0083] Comparative Example 1

[0084] The first aspect of this example provides a special spray cleaning agent for non-foaming aluminum cans. The raw materials for its preparation are calculated by weight and are specifically: 20 parts of inorganic base, 4 parts of alkyl carboxylic acid soap compounds, 2 parts of organic alcohol amines, 0.5 parts of corrosion inhibitors, 3 parts of nitrates, 1.5 parts of wetting agents, 4 parts of PEG, and 65 parts of water.

[0085] The inorganic base is potassium hydroxide.

[0086] The brand of the alkyl carboxylic acid soap compound is DX-NF 109, which is purchased from Guangzhou Dexu New Materials Co., Ltd.

[0087] The organic alcohol amine is diglycolamine.

[0088] The corrosion inhibitor is sebacic acid and 2,4,6-tris(aminocaproic acid)-1,3,5-triazine, and the mass ratio of sebacic acid to 2,4,6-tris(aminocaproic acid)-1,3,5-triazine is 1:8.

[0089] The nitrate is sodium nitrate.

[0090] The brand of the wetting agent is TUGER JC 40, which is purchased from Shanghai Zhongxi Chemical Co., Ltd.

[0091] The PEG is PEG-1500, purchased from Dow Chemical Company.

[0092] The second aspect of this example provides a method for preparing a non-foaming spray cleaning agent for aluminum cans, specifically:

[0093] S1, mixing the corrosion inhibitor and the organic alcohol amine, stirring and reacting for 1 hour to obtain an intermediate;

[0094] S2. Add water, inorganic base, alkyl carboxylic acid soap compound, nitrate, wetting agent and PEG to the intermediate and stir evenly to obtain the product.

[0095] Comparative Example 2

[0096] The first aspect of this example provides a special spray cleaning agent for non-foaming aluminum cans. The raw materials for its preparation are calculated by weight and are specifically: 20 parts of inorganic base, 4 parts of alkyl carboxylic acid soap compounds, 2 parts of organic alcohol amines, 0.5 parts of corrosion inhibitors, 3 parts of nitrates, 1.5 parts of wetting agents, 4 parts of PEG, and 65 parts of water.

[0097] The inorganic base is sodium hydroxide.

[0098] The brand of the alkyl carboxylic acid soap compound is DX-NF 109, which is purchased from Guangzhou Dexu New Materials Co., Ltd.

[0099] The organic alcohol amines are triethanolamine and isopropanolamine, and the mass ratio of triethanolamine to isopropanolamine is 4:1.

[0100] The corrosion inhibitor is acetic acid.

[0101] The nitrate is sodium nitrate.

[0102] The brand of the wetting agent is Miranol JEM Conc (sodium alkylaminopropionate), which is purchased from Foshan Ferroli Trading Co., Ltd.

[0103] The PEGs are PEG-200 and PEG-400, the mass ratio of PEG-200 to PEG-400 is 1:4, and both are purchased from Dow Chemical Company.

[0104] The second aspect of this example provides a method for preparing a non-foaming spray cleaning agent for aluminum cans, specifically:

[0105] S1, mixing the corrosion inhibitor and the organic alcohol amine, stirring and reacting for 1 hour to obtain an intermediate;

[0106] S2. Add water, inorganic base, alkyl carboxylic acid soap compound, nitrate, wetting agent and PEG to the intermediate and stir evenly to obtain the product.

[0107] Comparative Example 3

[0108] The first aspect of this example provides a special spray cleaning agent for non-foaming aluminum cans. The raw materials for its preparation are calculated by weight, specifically: 40 parts of inorganic base, 1 part of alkyl carboxylic acid soap compound, 2 parts of organic alcohol amine, 0.5 corrosion inhibitor, 3 parts of nitrate, 1.5 parts of wetting agent, 4 parts of PEG, and 48 parts of water.

[0109] The inorganic base is potassium hydroxide.

[0110] The brand of the alkyl carboxylic acid soap compound is DX-NF 109, which is purchased from Guangzhou Dexu New Materials Co., Ltd.

[0111] The organic alcohol amines are triethanolamine and methylethanolamine, and the mass ratio of triethanolamine to methylethanolamine is 5:1.

[0112] The corrosion inhibitor is sebacic acid and 2,4,6-tris(aminocaproic acid)-1,3,5-triazine, and the mass ratio of sebacic acid to 2,4,6-tris(aminocaproic acid)-1,3,5-triazine is 1:5.

[0113] The nitrate is sodium nitrate.

[0114] The brand of the wetting agent is TUGER JC 40, which is purchased from Shanghai Zhongxi Chemical Co., Ltd.

[0115] The PEGs mentioned above are PEG-200 and PEG-600, and the mass ratio of PEG-200 to PEG-600 is 5:1. Both are purchased from Dow Chemical Company.

[0116] The second aspect of this example provides a preparation method for a bubble-free special spray cleaning agent for aluminum cans, specifically as follows:

[0117] S1. Mix the corrosion inhibitor and organic alkanolamine, and stir and react for 1 h to obtain an intermediate.

[0118] S2. Add water, inorganic base, alkyl carboxylate soap compound, nitrate, wetting agent, and PEG to the intermediate, and stir evenly to obtain the product.

[0119] Performance testing

[0120] 1. Foam performance testing

[0121] Testing objects: The bubble-free special spray cleaning agents for aluminum cans prepared in Examples 1-3 and Comparative Examples 1-3.

[0122] Testing method: Dilute the bubble-free special spray cleaning agent for aluminum cans 20 times with water, and then use the Ross-Miles method to test the initial foam height and the foam height after 5 min. The test results are shown in Table 1.

[0123] Table 1

[0124] Serial number Initial foam height (mm) Foam height after 5 min (mm) Example 1 0 0 Example 2 0 0 Example 3 0 0 Comparative example 1 0 0 Comparative example 2 0 0 Comparative example 3 0 0

[0125] The experimental results in Table 1 show that the low-foam cleaning agent provided by the present invention has excellent low-foam performance.

[0126] 2. 56# dyno pen test

[0127] Testing objects: The bubble-free special spray cleaning agents for aluminum cans prepared in Examples 1-3 and Comparative Examples 1-3.

[0128] Testing method: At 60 °C, use the aisle-type flowing water spray process to spray the surface of the aluminum can with the bubble-free special spray cleaning agent diluted 20 times for 60 s, then spray and rinse 3 times, then bake dry and cool, and then use a 56# dyno pen to test the surface of the aluminum can. Observe whether there is local shrinkage on the surface of the aluminum can. If there is no local shrinkage, it is recorded as qualified; if there is local shrinkage, it is recorded as unqualified. The test results are shown in Table 2 and Figure 1 (Example 1), Figure 3 (Example 2), Figure 5 (Example 3), Figure 7 (Comparative Example 1), Figure 9 (Comparative Example 2), Figure 11 (Comparative Example 3), where Figure 7, 9 2. The 11 red boxed areas are the areas where shrinkage appears on the surface of the aluminum can.

[0129] Table 2

[0130] Serial number Test result Example 1 Qualified Example 2 Qualified Example 3 Qualified Comparative example 1 Unqualified Comparative example 2 Unqualified Comparative example 3 Unqualified

[0131] The experimental results in Table 2 show that the bubble-free special spray cleaning agent for aluminum cans provided in Examples 1-3 of the present invention can pass the 56# dyne pen test. Since the types or mass fractions of the raw materials in Comparative Examples 1-3 do not meet the limitations of the present invention, they fail to pass the 56# dyne pen test.

[0132] 3. Breakdown current test

[0133] Test objects: The low-foam cleaning agents prepared in Examples 1-3 and Comparative Examples 1-3.

[0134] Test method: After using the low-foam cleaning agent to clean the zinc stearate on the surface of the aluminum can, then perform the primer coating treatment on the inner surface of the aluminum can. After the primer-coated aluminum can is baked and cured, it is cooled to room temperature of 25°C; then test the breakdown current of the product (≤10 mA is qualified), and the test results are shown in Table 3 and Figure 2 (Example 1), Figure 4 (Example 2), Figure 6 (Example 3), Figure 8 (Comparative Example 1), Figure 10 (Comparative Example 2), Figure 12 (Comparative Example 3).

[0135] Table 3

[0136] Serial number Breakdown current (mA) Example 1 1.22 Example 2 4.52 Example 3 0.82 Comparative example 1 53.61 Comparative example 2 30.30 Comparative example 3 10.80

[0137] The experimental results in Table 3 show that the low-foam cleaning agents provided in Examples 1-3 of the present invention can effectively clean the zinc stearate on the surface of the aluminum can after use, and the breakdown current after primer coating is less than 10 mA. Since the types or mass fractions of the raw materials in Comparative Examples 1-3 do not meet the limitations of the present invention, the cleaning effect is significantly reduced, and the breakdown current after primer coating is greater than 10 mA.

Claims

1. A non-foaming spray cleaning agent for aluminum cans, characterized in that: The raw materials for preparation include, by weight, 15-30 parts of inorganic base, 2-8 parts of alkyl carboxylic acid soap compounds, 1-5 parts of organic alcohol amines, 0.1-3 parts of corrosion inhibitors, 1-5 parts of nitrates, 0.1-2 parts of wetting agents, 1-5 parts of PEG, and 10-80 parts of water.

2. The non-foaming aluminum can spray cleaning agent according to claim 1, characterized in that: The inorganic base includes one or more of sodium hydroxide, potassium hydroxide and lithium hydroxide.

3. The non-foaming aluminum can spray cleaning agent according to claim 1, characterized in that: The brands of the alkyl carboxylic acid soap compounds include XPH 109 and / or DX-NF 109.

4. The non-foaming aluminum can spray cleaning agent according to any one of claims 1 to 3, characterized in that: The organic alcohol amines include one or more of monoisopropanolamine, diisopropanolamine, triisopropanolamine, monoethanolamine, diethanolamine, triethanolamine and methylethanolamine.

5. The non-foaming aluminum can spray cleaning agent according to claim 1, characterized in that: The corrosion inhibitor includes one or more of octanedioic acid, sebacic acid, undecanedicarboxylic acid, dodecanedioic acid, and organic tribasic acid.

6. The non-foaming aluminum can spray cleaning agent according to claim 5, characterized in that: The organic tribasic acid includes one or more of CP-50, TAT730, IRGACOR L190 PLUS, and 2,4,6-tris(aminocaproic acid)-1,3,5-triazine.

7. The non-foaming aluminum can spray cleaning agent according to claim 1, characterized in that: The nitrate includes one or more of sodium nitrate, lithium nitrate, potassium nitrate and ammonium nitrate.

8. The non-foaming aluminum can spray cleaning agent according to claim 1, characterized in that: The wetting agent includes Miranol JEM Conc or TUGER JC 40.

9. The non-foaming aluminum can spray cleaning agent according to claim 1, characterized in that: The PEG includes one or more of PEG-200, PEG-300, PEG-400, PEG-600, PEG-800, and PEG-1000.

10. A method for preparing the special spray cleaning agent for non-foaming aluminum cans according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, mixing the corrosion inhibitor and the organic alcohol amine, stirring and reacting for 1-3 hours to obtain an intermediate; S2. Add water, inorganic base, alkyl carboxylic acid soap compound, nitrate, wetting agent and PEG to the intermediate and stir evenly to obtain the product.

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