Fluorine-free cleaning agent for aluminum material and preparation method thereof

Abstract

The present application relates to a kind of fluorine-free aluminum material cleaning agent, which is prepared from the following components by mass percentage: potassium hydroxide 10-15%, sorbitol 1-4%, sodium gluconate 2-4%, polyoxyethylene nonionic surfactant 4-5%, sodium dodecyl benzene sulfonate 3-6%, dispersant 1.5-2.5%, and the balance is water. The present application also protects the preparation method of the above-mentioned fluorine-free aluminum material cleaning agent. The fluorine-free aluminum material cleaning agent of the present application does not contain hydrofluoric acid, meets the environmental protection requirements, has a simple preparation method and low cost. In addition, it can effectively remove oil and oxides on the surface of aluminum materials, has a high cleaning rate, and has good corrosion resistance. It can protect the smoothness and brightness of the surface of aluminum materials without damaging the workpiece.

Description

Technical Field

[0001] This invention belongs to the technical field of aluminum cleaning agents, specifically relating to a fluorine-free aluminum cleaning agent and its preparation method. Background Technology

[0002] Aluminum is widely used in aerospace, construction, transportation, electrical, and chemical industries, ranking second in demand among metallic materials after steel. During manufacturing and use, aluminum workpieces are frequently exposed to various oils and oxides—based on mineral or animal oils and containing organic or inorganic additives—due to machining, rust prevention, and loading / transportation. Therefore, before surface treatment, aluminum must undergo pretreatment—that is, surface cleaning—to remove these oils and oxides.

[0003] Existing aluminum cleaning agents, in order to achieve significant cleaning results, mostly employ acidic methods. However, these acidic aluminum cleaning agents contain large amounts of hydrofluoric acid, which poses potential environmental and safety hazards. Under acidic conditions, fluoride ions are highly corrosive, severely damaging workpieces. Moreover, fluoride ions harm the environment, affecting the survival of aquatic organisms and animals, disrupting the ecological balance, and the discharge of fluoride-containing waste is already restricted by environmental regulations in various regions, making its disposal quite difficult. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing a fluorine-free aluminum cleaning agent and its preparation method.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0006] A fluorine-free aluminum cleaning agent is prepared from the following components by mass percentage: 10-15% potassium hydroxide, 1-4% sorbitol, 2-4% sodium gluconate, 4-5% polyoxyethylene nonionic surfactant, 3-6% sodium dodecylbenzene sulfonate, 1.5-2.5% dispersant, and the balance being water.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the fluorine-free aluminum cleaning agent is prepared from the following components by mass percentage: 12-14% potassium hydroxide, 2.4-4% sorbitol, 3-4% sodium gluconate, 4-5% polyoxyethylene nonionic surfactant, 4-5% sodium dodecylbenzene sulfonate, 1.5-2.5% dispersant, and the balance being water.

[0009] Furthermore, the polyoxyethylene nonionic surfactant used is OP-10.

[0010] Furthermore, the mass ratio of sorbitol, OP-10, and sodium dodecylbenzenesulfonate is 0.6:1:1.

[0011] This invention also protects a method for preparing the above-mentioned fluorine-free aluminum cleaning agent, comprising the following steps:

[0012] S1. Mix potassium hydroxide, sorbitol and sodium gluconate in the prescribed amounts with water, and stir at a speed of 200 rpm or higher for 30 min or more to obtain a mixture;

[0013] S2. Mix the formulated amounts of polyoxyethylene nonionic surfactant and sodium dodecylbenzene sulfonate to obtain a compound surfactant;

[0014] S3. Add the compound surfactant prepared in S2 and the amount of dispersant in the formula to the mixture obtained in S1, and stir at a speed of more than 200 rpm for more than 30 minutes to obtain the fluorine-free aluminum cleaning agent.

[0015] The beneficial effects of this invention are as follows: First, the fluorine-free aluminum cleaning agent of this invention does not contain hydrofluoric acid, meets environmental protection requirements, and has a simple preparation method and low cost; second, the product of this invention can effectively remove oil and oxides from the surface of aluminum materials, has a high cleaning rate, and also has good anti-corrosion ability, which can protect the smoothness and brightness of the aluminum surface without damaging the workpiece. Detailed Implementation

[0016] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0017] Unless otherwise stated, the raw materials used in this invention are conventional materials in this technical field and are all commercially available. Unless otherwise specified, the test methods and detection methods in the following embodiments are conventional methods, and the equipment and instruments used in the tests are all commercially available. Parts not described in detail in this specification belong to the prior art.

[0018] The present application discloses a fluorine-free aluminum cleaning agent, which is prepared from the following components by mass percentage: 10-15% potassium hydroxide, 1-4% sorbitol, 2-4% sodium gluconate, 4-5% polyoxyethylene nonionic surfactant, 3-6% sodium dodecylbenzene sulfonate, 1.5-2.5% dispersant, and the balance being water.

[0019] Prepared using a specific method, including the following steps:

[0020] S1. Mix potassium hydroxide, sorbitol and sodium gluconate in the prescribed amounts with water, and stir at a speed of 200 rpm or higher for 30 min or more to obtain a mixture;

[0021] S2. Mix the formulated amounts of polyoxyethylene nonionic surfactant and sodium dodecylbenzene sulfonate to obtain a compound surfactant;

[0022] S3. Add the compound surfactant prepared in S2 and the amount of dispersant in the formula to the mixture obtained in S1, and stir at a speed of more than 200 rpm for more than 30 minutes to obtain the fluorine-free aluminum cleaning agent.

[0023] The following are embodiments of this application.

[0024] Example 1

[0025] The fluorine-free aluminum cleaning agent of Example 1 of the present invention is prepared by the following steps:

[0026] S1. Place 10 kg of potassium hydroxide, 4 kg of sorbitol and 4 kg of sodium gluconate into a stirring device, add 68.5 kg of water and mix. Stir at 300 rpm for 45 min to obtain a mixture.

[0027] S2. Mix OP-105Kg and sodium dodecylbenzenesulfonate 6Kg to obtain a compound surfactant;

[0028] S3. Add 2.5 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 300 rpm for 45 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0029] Example 2

[0030] The fluorine-free aluminum cleaning agent of Example 2 of the present invention is prepared by the following steps:

[0031] S1. Place 11 kg of potassium hydroxide, 3 kg of sorbitol and 3 kg of sodium gluconate into a stirring device, add 71.5 kg of water and mix. Stir at 400 rpm for 30 min to obtain a mixed solution.

[0032] S2. Mix 4.5 kg of OP-10 and 5 kg of sodium dodecylbenzenesulfonate to obtain a compound surfactant;

[0033] S3. Add 2 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 200 rpm for 60 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0034] Example 3

[0035] The fluorine-free aluminum cleaning agent of Example 3 of the present invention is prepared by the following steps:

[0036] S1. Place 14.5 kg of potassium hydroxide, 2 kg of sorbitol and 2.5 kg of sodium gluconate into a stirring device, add 71.5 kg of water and mix. Stir at 200 rpm for 60 min to obtain a mixed solution.

[0037] S2. Mix OP-104 kg and sodium dodecylbenzene sulfonate 3.5 kg to obtain a compound surfactant;

[0038] S3. Add 2 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 400 rpm for 30 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0039] Example 4

[0040] The fluorine-free aluminum cleaning agent of Example 4 of the present invention is prepared by the following steps:

[0041] S1. Place 15 kg of potassium hydroxide, 1 kg of sorbitol and 2 kg of sodium gluconate into a stirring device, add 73.5 kg of water and mix. Stir at 400 rpm for 30 min to obtain a mixture.

[0042] S2. Mix OP-104 kg and sodium dodecylbenzene sulfonate 3 kg to obtain a compound surfactant;

[0043] S3. Add 1.5 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 400 rpm for 30 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0044] Example 5

[0045] The fluorine-free aluminum cleaning agent of Example 5 of the present invention is prepared by the following steps:

[0046] S1. Place 13 kg of potassium hydroxide, 3.5 kg of sorbitol and 3.5 kg of sodium gluconate into a stirring device, add 69.5 kg of water and mix. Stir at 300 rpm for 45 min to obtain a mixed solution.

[0047] S2. Mix 4.5 kg of OP-10 and 4 kg of sodium dodecylbenzenesulfonate to obtain a compound surfactant;

[0048] S3. Add 2 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 300 rpm for 45 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0049] Example 6

[0050] The fluorine-free aluminum cleaning agent of Example 6 of the present invention is prepared by the following steps:

[0051] S1. Put 12 kg of potassium hydroxide, 4 kg of sorbitol and 3 kg of sodium gluconate into a stirring device, add 69 kg of water and mix. Stir at 400 rpm for 30 min to obtain a mixture.

[0052] S2. Mix OP-105Kg and sodium dodecylbenzenesulfonate 4.5Kg to obtain a compound surfactant;

[0053] S3. Add 2.5 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 200 rpm for 60 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0054] Example 7

[0055] The fluorine-free aluminum cleaning agent of Example 7 of the present invention is prepared by the following steps:

[0056] S1. Place 14 kg of potassium hydroxide, 3 kg of sorbitol and 4 kg of sodium gluconate into a stirring device, add 68.5 kg of water and mix. Stir at 400 rpm for 30 min to obtain a mixture.

[0057] S2. Mix OP-104 kg and sodium dodecylbenzene sulfonate 5 kg to obtain a compound surfactant;

[0058] S3. Add 1.5 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 400 rpm for 30 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0059] Example 8

[0060] The fluorine-free aluminum cleaning agent of Example 8 of the present invention is prepared by the following steps:

[0061] S1. Place 12 kg of potassium hydroxide, 2.4 kg of sorbitol and 3 kg of sodium gluconate into a stirring device, add 73.1 kg of water and mix. Stir at 300 rpm for 45 min to obtain a mixture.

[0062] S2. Mix 4 kg of OP-10 and 4 kg of sodium dodecylbenzenesulfonate to obtain a compound surfactant;

[0063] S3. Add 1.5 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 300 rpm for 45 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0064] Example 9

[0065] The fluorine-free aluminum cleaning agent of Example 9 of the present invention is prepared by the following steps:

[0066] S1. Place 13 kg of potassium hydroxide, 2.7 kg of sorbitol and 4 kg of sodium gluconate into a stirring device, add 68.8 kg of water and mix. Stir at 200 rpm for 60 min to obtain a mixed solution.

[0067] S2. Mix 4.5 kg of OP-10 and 4.5 kg of sodium dodecylbenzenesulfonate to obtain a compound surfactant;

[0068] S3. Add 2.5 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 400 rpm for 30 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0069] Example 10

[0070] The fluorine-free aluminum cleaning agent of Example 10 of the present invention is prepared by the following steps:

[0071] S1. Place 14 kg of potassium hydroxide, 3 kg of sorbitol and 3.5 kg of sodium gluconate into a stirring device, add 67.5 kg of water and mix. Stir at 400 rpm for 30 min to obtain a mixed solution.

[0072] S2. Mix OP-105Kg and sodium dodecylbenzenesulfonate 5Kg to obtain a compound surfactant;

[0073] S3. Add 2 kg of the compound surfactant and dispersant prepared in S2 to the mixture obtained in S1, and stir at 200 rpm for 60 min to obtain the fluorine-free aluminum cleaning agent of this embodiment.

[0074] Performance testing:

[0075] Using Henkel P3-almeco 18 aluminum cleaner and ES-516 aluminum cleaner as Comparative Examples 1 and 2, and Examples 1-10 of this application as examples, 2% aqueous solutions were prepared respectively. Cleaning performance tests were then conducted according to JB / T4323.2-1999 to observe whether the aluminum surface was clean and whether there was any black or gray residue. Corrosion performance tests were conducted according to GB / T 8753.2-2005, i.e., the mass loss per unit area of ​​aluminum was evaluated. Specific test results are shown in Table 1 below.

[0076] Table 1. Test results of Examples 1-10 and Comparative Examples 1-2

[0077]

[0078] As shown in Table 1, the fluorine-free aluminum cleaning agent prepared in this application has a higher cleaning rate compared with commercially available aluminum cleaning agents. It can effectively remove oil and oxides from the aluminum surface, leaving the aluminum surface clean. Simultaneously, there is no black ash residue on the aluminum surface, and the mass loss per unit area is low. This indicates that the fluorine-free aluminum cleaning agent prepared in this application has good anti-corrosion capabilities, protecting the smoothness and gloss of the aluminum surface without damaging the workpiece. Furthermore, as can be seen from Examples 8-10, when the mass ratio of sorbitol, OP-10, and sodium dodecylbenzenesulfonate is 0.6:1:1, sorbitol, OP-10, and sodium dodecylbenzenesulfonate can better exert a synergistic effect, resulting in a better cleaning rate for the fluorine-free aluminum cleaning agent.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fluorine-free aluminum cleaning agent, characterized in that, It is prepared from the following components by mass percentage: 12-14% potassium hydroxide, 2.4-3% sorbitol, 3-4% sodium gluconate, 4-5% polyoxyethylene nonionic surfactant, 4-5% sodium dodecylbenzenesulfonate, 1.5-2.5% dispersant, and the balance being water; the polyoxyethylene nonionic surfactant is OP-10; the mass ratio of sorbitol, OP-10 and sodium dodecylbenzenesulfonate is 0.6:1:

1.

2. The preparation method of the fluorine-free aluminum cleaning agent according to claim 1, characterized in that, Includes the following steps: S1. Mix the prescribed amounts of potassium hydroxide, sorbitol, and sodium gluconate with water, and stir at a speed of 200 rpm or higher for at least 30 minutes to obtain a mixture; S2. Mix the formulated amounts of polyoxyethylene nonionic surfactant and sodium dodecylbenzene sulfonate to obtain a compound surfactant; S3. Add the compound surfactant prepared in S2 and the amount of dispersant in the formula to the mixture obtained in S1, and stir at a speed of more than 200 rpm for more than 30 minutes to obtain the fluorine-free aluminum cleaning agent.

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