Aluminum-based efficient alkaline cleaning agent based on novel aluminum corrosion inhibition material and use method of aluminum-based efficient alkaline cleaning agent

Abstract

The invention relates to the technical field of industrial cleaning agents, in particular to an aluminum-based efficient alkaline cleaning agent based on a novel aluminum corrosion inhibition material and a using method of the aluminum-based efficient alkaline cleaning agent. Every 1 L of the cleaning agent comprises the following components: 55 to 65 g of an alkaline main agent, 130 to 135 g of a cleaning auxiliary agent, 90 to 120 g of a surfactant, 80 to 100 g of a succinic anhydride and diethanol amine reactant, and 45 to 60 g of sodium metasilicate pentahydrate, wherein in the reactants of succinic anhydride and diethanol amine, the reaction feeding ratio of succinic anhydride to diethanol amine is 1: 2.15. The use method comprises the following step: carrying out ultrasonic cleaning for 5 minutes at 45-55 DEG C by using the concentration of 3-4%. The strong base is adopted as a main agent and matched with a small amount of surfactant and builder, the cost is reduced, and the cleaning power is enhanced; succinic anhydride and diethanol amine reactants are introduced to be compounded with sodium metasilicate pentahydrate, so that an aluminum workpiece is comprehensively protected, and the corrosion inhibitor has the characteristics of high concentration, good corrosion inhibition effect and low cost; the reuse of potassium hydroxide and potassium carbonate stabilizes alkalinity, prolongs the service life of the cleaning solution, reduces the use cost, and improves the production efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of industrial cleaning agents, and in particular to an aluminum-based high-efficiency alkaline cleaning agent based on a novel aluminum corrosion inhibition material and a method for using the same. Background Art

[0002] After extrusion or machining, aluminum workpieces often retain a significant amount of machining oil, aluminum chips, and aluminum powder on their surfaces. To ensure smooth operation of subsequent processes, these surface contaminants must be cleaned. However, conventional cleaning agents are not ideal for industrial applications when dealing with heavy oil stains and the large volume of cleaning required.

[0003] Currently, the most common cleaning method is to use a mixture of a weak base and an organic base, adding sodium metasilicate pentahydrate and a large amount of surfactant. While this method has some cleaning power for oil stains, it is less effective for removing solid particles. Furthermore, strong bases like potassium hydroxide can corrode workpieces, while sodium metasilicate pentahydrate has limited solubility and flocculation, making it difficult to formulate a highly concentrated cleaning agent. Summary of the Invention

[0004] In order to solve the above-mentioned problems, the present application provides an aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibition material and a method for using the same.

[0005] In the first aspect, the present application provides an aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibition material using the following technical solutions: A high-efficiency alkaline cleaning agent for aluminum based on a novel aluminum corrosion inhibitor, comprising the following components per liter of cleaning agent: 55-65g of an alkaline main agent, 130-135g of a cleaning aid, 90-120g of a surfactant, 80-100g of a reactant of succinic anhydride and diethanolamine, and 45-60g of sodium metasilicate pentahydrate; In the reaction product of succinic anhydride and diethanolamine, the reaction feed ratio of succinic anhydride to diethanolamine is 1:2.15.

[0006] Furthermore, the following components are included per 1L of cleaning agent: 60g alkaline main agent, 133g cleaning aid, 100g surfactant, 90g reaction product of succinic anhydride and diethanolamine, 50g sodium metasilicate pentahydrate; In the reaction product of succinic anhydride and diethanolamine, the reaction feed ratio of succinic anhydride to diethanolamine is 1:2.15.

[0007] By adopting the above technical solution, the aluminum-based high-efficiency alkaline cleaning agent based on the new aluminum corrosion inhibition material demonstrates all-round excellent performance: it performs excellently in cleaning effect, and can thoroughly remove processing oil, aluminum chips, aluminum powder and other dirt on the surface of aluminum-based workpieces, leaving the workpieces clean and free of residue; it is extremely effective in protecting aluminum workpieces, with no discoloration or abnormal reaction on the workpiece surface during cleaning, and laboratory immersion experiments show that the workpieces have no weight loss, effectively avoiding corrosion and damage; it has low cost and high efficiency, with only a concentration of 3-4% required for thorough cleaning, and the product is non-viscous and easy to operate; the rinsing process is convenient, and the hydrophilic surfactant allows the cleaned workpieces to be easily rinsed in pure water without residue, fully ensuring the high quality of the aluminum-based workpieces and the smooth progress of subsequent processes.

[0008] Furthermore, the cleaning aid includes: 100g of alkaline buffer, 30g of chelating agent, and 3g of viscosity regulator.

[0009] Furthermore, the alkaline buffer is potassium carbonate; the chelating agent is sodium gluconate; and the viscosity regulator is sodium chloride.

[0010] Furthermore, the alkaline main agent is potassium hydroxide; and the surfactant is nonylphenol polyoxyethylene ether.

[0011] By adopting the above technical solution, the various components work together to exert significant advantages: potassium hydroxide, as the alkaline main agent, has a stronger saponification ability for grease than other alkalis, and can efficiently decompose oil stains; potassium carbonate, as an alkaline buffer, can effectively stabilize the alkaline environment of the cleaning fluid and extend the service life of the cleaning fluid; nonylphenol polyoxyethylene ether, as a hydrophilic surfactant, can significantly reduce surface tension and enhance cleaning ability, and after cleaning, the workpiece is easy to rinse in pure water without residue; sodium gluconate and sodium chloride are used in combination to produce a synergistic effect, further improving the overall performance of the cleaning agent.

[0012] In the second aspect, the present application provides a method for using an aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibition material using the following technical solution: The invention discloses a method for using an aluminum-based high-efficiency alkaline cleaning agent based on a novel aluminum corrosion inhibition material, wherein the cleaning agent is ultrasonically cleaned at a concentration of 3% to 4% at 45 to 55° C. for 5 minutes.

[0013] In a third aspect, the present application provides a cleaning active composition using the following technical solution: A cleaning active composition comprises the following components, calculated by weight percentage: 30% potassium hydroxide, 45% reactant obtained by reacting succinic anhydride and diethanolamine at a ratio of 1:2.15, and 25% sodium metasilicate pentahydrate.

[0014] By adopting the above technical solution, a special compounding effect is formed between the reactants of sodium metasilicate pentahydrate, succinic anhydride and diethanolamine at a reaction ratio of 1:2.15, which brings significant technical advantages to the cleaning active composition. During the cleaning process, the combination of the two significantly improves the removal of various types of dirt, especially stubborn stains such as residual processing oil on aluminum-based workpiece surfaces. On the one hand, the succinic anhydride and diethanolamine reactants can assist the sodium metasilicate pentahydrate in penetrating deep into the oil stains, breaking the bond between the oil stains and the workpiece surface and making it easier for the oil stains to separate from the workpiece. On the other hand, the saponification of the sodium metasilicate pentahydrate converts oils and fats into water-soluble substances, creating a more favorable decontamination environment for the succinic anhydride and diethanolamine reactants. The synergistic effect of the two greatly enhances the cleaning active composition's ability to remove dirt. The combination of the two also has an excellent removal effect on solid particles such as aluminum chips and aluminum powder. The reaction product of succinic anhydride and diethanolamine can change the surface charge state of solid particles, causing them to repel each other, making them easier to detach from the workpiece surface. The presence of sodium metasilicate pentahydrate can increase the suspension capacity of the cleaning liquid, preventing the detached solid particles from re-depositing on the workpiece surface. The two work together to effectively improve the removal efficiency of solid particles. Sodium metasilicate pentahydrate suffers from limited solubility and flocculation, but these issues are effectively alleviated when compounded with succinic anhydride and diethanolamine. The succinic anhydride and diethanolamine reactants can improve the dispersibility of sodium metasilicate pentahydrate in cleaning fluids to a certain extent, reducing the occurrence of flocculation. Furthermore, the reactants can adjust the viscosity of the cleaning fluid, ensuring optimal fluidity, facilitating even coverage of the workpiece surface during the cleaning process and improving cleaning efficiency. Succinic anhydride is slightly soluble in water. When reacting with diethanolamine in water, it first hydrolyzes into succinic acid, which then reacts with diethanolamine. This exothermic process accelerates the reaction until completion, ultimately producing an alcohol-amide product. These products exhibit excellent film-forming properties and corrosion inhibition, forming a protective film on aluminum workpieces, minimizing the risk of corrosion from cleaning fluids and protecting the workpieces from damage during the cleaning process.

[0015] In a fourth aspect, the present application provides an application of a cleaning active composition using the following technical solution: The cleaning active composition can be used as a raw material for preparing industrial cleaning agents.

[0016] By adopting the above technical solution, the cleaning active composition can be used as a raw material for preparing industrial cleaning agents and is widely used. Its excellent performance and cost-effectiveness make it have broad application prospects in many fields such as automobile manufacturing, aerospace, and electronic appliances. By using this cleaning active composition, enterprises can significantly improve cleaning efficiency and quality, reduce production costs, and enhance market competitiveness.

[0017] In summary, this application includes the following beneficial technical effects: 1. To address the problem of high cleaning fluid costs caused by the large amount of surfactants used in weak base organic base systems, the present invention uses a strong base as the main cleaning agent, combined with a small amount of surfactants and builders. This formulation design effectively reduces the cost of the cleaning fluid while significantly enhancing the cleaning power, meeting the industrial production demand for efficient and low-cost cleaning; 2. The present application introduces the reactants of succinic anhydride and diethanolamine and sodium metasilicate pentahydrate for compounding. The present invention can achieve complete protection of aluminum workpieces to avoid corrosion during the cleaning process. At the same time, the compound system makes the cleaning active composition highly concentrated, which is convenient for transportation and storage, further reducing the cost of use. The reactants of succinic anhydride and diethanolamine serve as corrosion inhibitors, not only having a good tin protection effect, but also having a corrosion inhibition effect on other metals. Its film formation is complete, which can effectively prevent local attacks on aluminum alloy workpieces and extend the service life of the workpieces. Compared with other corrosion inhibitor products on the market, this reactant shows obvious advantages in cost, usage and high alkalinity resistance.

[0018] 3. The reuse of potassium hydroxide and potassium carbonate in this application makes the alkalinity of the cleaning solution relatively stable. This stability helps to maintain the durability of the cleaning effect and extend the service life of the cleaning solution. By reducing the replacement frequency, the cost of use is further reduced and production efficiency is improved. DETAILED DESCRIPTION

[0019] To more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments. It should be understood that the embodiments described are only a portion of the present invention, not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0020] The purpose of the present invention is illustrated by the following examples. The components of the composition are illustrated in parts by weight as a general standard. Unless otherwise specified, for the sake of simplicity, the "parts" described in the examples of the present invention have the same meaning as parts by weight.

[0021] Unless otherwise specified, all reagents and instruments used were commercially available.

[0022] Performance testing An automobile extruded profile skeleton structure was used as a workpiece to be tested, and the cleaning agents prepared in the embodiments and comparative examples were used as the test samples. The workpiece to be tested was ultrasonically cleaned at 50° C. for 5 minutes using the test samples at a concentration of 4%. After cleaning, the cleaning effect was tested.

[0023] Among them, the surface of the aluminum-based workpiece should be free of grease and solid particles (SEM observation), and the oil removal rate and solid particle removal rate should be greater than 99%; there should be no corrosion spots, discoloration, etc. on the surface of the workpiece.

[0024] Examples 1-11 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, calculated per 1L of cleaning agent, its components and their dosage (g) are as follows: In the above-mentioned reactants of succinic anhydride and diethanolamine, the reaction feed ratio of succinic anhydride to diethanolamine is 1:2.15.

[0025] The above-mentioned aluminum-based high-efficiency alkaline cleaning agent based on the new aluminum corrosion inhibition material is prepared by the following method: the above-mentioned components are mixed and dissolved at room temperature to obtain a non-viscous product.

[0026] The cleaning agents prepared in Examples 1 to 11 were tested for their performance according to the test method, and the test results are as follows.

[0027] As can be seen from the table above, the cleaning agents prepared in Examples 1-11 all had oil removal rates of 99.7% and above, and solid particle removal rates of 99.5% and above. Furthermore, no spots or discoloration were observed on the workpiece surfaces after cleaning, indicating that these cleaning agents all had excellent oil and solid particle removal capabilities, did not cause corrosion damage to the workpieces, and were highly concentrated, requiring only 3-4% to provide thorough cleaning. The performance of Example 11 is the best among all the examples, and therefore it can be regarded as the optimal example.

[0028] Example 12 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibition material, the dosage of each component and the preparation method are basically the same as those in Example 11, the only difference being that the alkaline main agent is sodium hydroxide.

[0029] Example 13 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, the amounts of the components and the preparation method of which are basically the same as those of Example 11, with the only difference being that the alkaline buffer in the cleaning aid is sodium carbonate.

[0030] Example 14 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, the amounts of the components and the preparation method of which are basically the same as those of Example 11, with the only difference being that the alkaline buffer in the cleaning aid is sodium bicarbonate.

[0031] Example 15 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, the amounts of the components and the preparation method of which are basically the same as those of Example 11, with the only difference being that the alkaline buffer in the cleaning aid is a mixture of sodium carbonate and sodium bicarbonate in a weight ratio of 1:1.

[0032] Example 16 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, the amounts of the components and the preparation method of which are basically the same as those of Example 11, with the only difference being that the chelating agent in the cleaning aid is EDTA-2Na.

[0033] Example 17 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, the amounts of the components and the preparation method of which are basically the same as those of Example 11, with the only difference being that the chelating agent in the cleaning aid is sodium citrate.

[0034] Example 18 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, the amounts of the components and the preparation method of which are basically the same as those of Example 11, with the only difference being that the surfactant is a branched fatty alcohol polyoxyethylene ether.

[0035] The cleaning agents prepared in Examples 12-18 were subjected to performance testing according to the test methods, and the test results are as follows.

[0036] From the data in the above table, it can be found that the cleaning agents prepared by Examples 12-18 have an oil removal rate of greater than 99% for the surface of the aluminum-based workpiece, and a solid particle removal rate of greater than 98%, and there are no spots or discoloration on the workpiece surface, indicating that these cleaning agents have shown good cleaning efficiency in the cleaning operation for the aluminum-based workpiece. They can not only remove oil and solid particles, but also have excellent corrosion inhibition and protection properties, and can effectively reduce the damage caused to the surface of the aluminum-based workpiece during the cleaning process; in Example 16 and Example 17, we selectively replaced the type of chelating agent and found that the oil removal rate and solid particle removal rate were significantly different. There is a clear downward trend. This may be because sodium gluconate and sodium chloride work together to adjust the pH value, ionic strength and other properties of the cleaning solution, creating a suitable chemical environment for the cleaning process. The appropriate ionic strength helps the surfactant to play a better role and enhance its wetting, emulsification and dispersion ability of oil stains and solid particles. The regulating effect of EDTA-2Na and sodium citrate on the properties of the cleaning solution is different from that of sodium gluconate. Their addition may change certain properties of the cleaning solution, such as surface tension and viscosity, thereby affecting the contact and action between the cleaning agent and the workpiece surface, as well as the performance of the surfactant, resulting in a decrease in the cleaning effect.

[0037] In Examples 13-15, we tried to use other possible carbonates as alkaline buffers. From the test results, we can see that there was a certain impact on the oil removal rate and the solid particle removal rate.

[0038] Comparative Example 1 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibition material, the dosage of each component and the preparation method are basically the same as those in Example 11, the only difference being that in the components of the succinic anhydride and diethanolamine reactants, the reaction feed ratio of succinic anhydride to diethanolamine is 1:2.

[0039] Comparative Example 2 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor material, the dosage of each component and the preparation method are basically the same as those in Example 11, the only difference being that the succinic anhydride and diethanolamine reactants are replaced by equal amounts of octyl succinic anhydride and diethanolamine reactants (reaction ratio 1.05:1).

[0040] Comparative Example 3 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor material, the dosage of each component and the preparation method are basically the same as those in Example 11, the only difference being that the succinic anhydride and diethanolamine reactants are replaced by equal amounts of lauric acid and diethanolamine reactants (reaction ratio 1.05:1).

[0041] Comparative Example 4 A high-efficiency aluminum-based alkaline cleaning agent based on a new aluminum corrosion inhibitor material, the dosage of each component and the preparation method are basically the same as those in Example 11, the only difference being that the succinic anhydride and diethanolamine reactants are replaced by equal amounts of dodecenylsuccinic acid and diethanolamine reactants (reaction ratio 1.8:1).

[0042] Comparative Example 5 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibition material, the dosage of each component and the preparation method are basically the same as those in Example 11, the only difference being that an equal amount of sodium silicate is used instead of sodium metasilicate pentahydrate.

[0043] Comparative Example 6 An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibition material, the dosage of each component and the preparation method are basically the same as those in Example 11, the only difference being that an equal amount of anhydrous sodium metasilicate is used instead of sodium metasilicate pentahydrate.

[0044] The cleaning agents prepared in Comparative Examples 1 to 6 were tested for their performance according to the test method, and the test results are as follows.

[0045] The test data shows that the cleaning agents prepared in Comparative Examples 1-6 performed poorly in terms of tin protection, and the aluminum workpieces all showed discoloration after cleaning. In particular, in Comparative Examples 3 and 4, a small amount of spots even appeared on the surface of the aluminum workpieces.

[0046] Succinic anhydride and octenylsuccinic anhydride are slightly soluble in water. When they react with diethanolamine in an aqueous solution, these anhydrides first hydrolyze in water to produce the corresponding acids of succinic acid and octenylsuccinic acid. These acids then react with diethanolamine, releasing heat. The increased temperature further accelerates the reaction until it is completed. The resulting finished product belongs to the alcohol amide category, which exhibits excellent film-forming properties and corrosion inhibition.

[0047] However, when we tried to replace them with other corrosion inhibitors with corrosion inhibition functions, we found many problems: some corrosion inhibitors are too expensive, which will increase production costs; some require large amounts of use to achieve the corresponding corrosion inhibition effect, resulting in increased use costs; and some corrosion inhibitors are unstable in highly alkaline environments and cannot coexist with other ingredients in the cleaning agent.

[0048] This result clearly demonstrates that the reaction product of succinic anhydride and diethanolamine, when combined with sodium metasilicate pentahydrate, can achieve comprehensive protection for aluminum workpieces. This complex system not only possesses high concentration properties, but also exhibits excellent corrosion protection for tin and other metals. During the cleaning process, it forms a complete and dense protective film on the aluminum workpiece surface, effectively preventing localized corrosion of the aluminum alloy workpiece by the cleaning solution.

[0049] The above are all modifications that a person skilled in the art can make to this embodiment as needed after reading this specification, which do not contribute creatively or solutions that obviously constitute technical inspiration. However, as long as they are within the scope of the claims of this application, they should be protected by patent law.

Claims

1. An aluminum-based high-efficiency alkaline cleaning agent based on a new aluminum corrosion inhibitor, characterized in that: Calculated per 1L of cleaning agent, including the following components: 55-65g alkaline main agent, 130-135g cleaning aid, 90-120g surfactant, 80-100g reaction product of succinic anhydride and diethanolamine, 45-60g sodium metasilicate pentahydrate; In the reaction product of succinic anhydride and diethanolamine, the reaction feed ratio of succinic anhydride to diethanolamine is 1:2.

15.

2. The aluminum-based high-efficiency alkaline cleaning agent based on the novel aluminum corrosion inhibition material according to claim 1, characterized in that: Calculated per 1L of cleaning agent, including the following components: 60g alkaline main agent, 133g cleaning aid, 100g surfactant, 90g reaction product of succinic anhydride and diethanolamine, 50g sodium metasilicate pentahydrate; In the reaction product of succinic anhydride and diethanolamine, the reaction feed ratio of succinic anhydride to diethanolamine is 1:2.

15.

3. The aluminum-based high-efficiency alkaline cleaning agent based on the novel aluminum corrosion inhibition material according to claim 1, characterized in that: The cleaning aid includes: 100g of alkaline buffer, 30g of chelating agent, and 3g of viscosity regulator.

4. The aluminum-based high-efficiency alkaline cleaning agent based on the novel aluminum corrosion inhibition material according to claim 3, characterized in that: The alkaline buffer is potassium carbonate; the chelating agent is sodium gluconate; and the viscosity regulator is sodium chloride.

5. The aluminum-based high-efficiency alkaline cleaning agent based on the novel aluminum corrosion inhibition material according to claim 1, characterized in that: The alkaline main agent is potassium hydroxide; the surfactant is nonylphenol polyoxyethylene ether.

6. A method for using the aluminum-based high-efficiency alkaline cleaning agent based on the novel aluminum corrosion inhibition material according to any one of claims 1 to 5, characterized in that: Use 3%-4% concentration and ultrasonic cleaning at 45-55℃ for 5 minutes.

7. A cleaning active composition, characterized in that Calculated by weight percentage, the invention comprises the following components: 30% potassium hydroxide, 45% reactant obtained by reacting succinic anhydride and diethanolamine at a reaction ratio of 1:2.15, and 25% sodium metasilicate pentahydrate.

8. Use of the cleaning active composition according to claim 7 in the preparation of industrial cleaning agents.

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