Weakly alkaline nonferrous metal water-based cleaning agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of industrial cleaning agents, and discloses a weakly alkaline nonferrous metal water-based cleaning agent which comprises the following components in parts by weight: 0.5-2 parts of a builder, 0.5-3 parts of a complexing agent, 0.5-3 parts of a penetrating agent, 1-5 parts of a composite nonferrous metal corrosion inhibitor, 8-18 parts of a surfactant and the balance of deionized water, totaling 100 parts. According to the cleaning agent, multiple surfactants are compounded with multiple metal corrosion inhibitors and auxiliaries, and the cleaning agent does not contain phosphorus, strong alkali, heavy metal, nonyl phenol, sodium nitrite and other harmful substances and has the advantages of being weak in alkalinity, high in cleaning capacity, high in cleaning speed, free of corrosion to non-ferrous metal, easy to rinse and free of residues; various light and heavy oil stains, dust, stains and the like on the surfaces of different non-ferrous metals can be rapidly cleaned and removed, and the cleaning effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial cleaning agents, in particular to a weakly alkaline nonferrous metal water-based cleaning agent and a preparation method and application thereof. Background Art

[0002] With the development of my country's manufacturing industry, the non-ferrous metal industry has also been booming. Non-ferrous metals have special properties such as electrical conductivity, thermal conductivity, plasticity, corrosion resistance, wear resistance, toughness, high strength, radioactivity, ductility, compressibility and rollability. They are widely used in agriculture, industry, national defense, science and technology and other fields. From cutting-edge weapons for national defense security to key components required for cutting-edge technologies such as television and communications in daily life, most of them are made of non-ferrous metals. Non-ferrous metals are playing an increasingly important role.

[0003] During the processing of non-ferrous metals, due to different processing methods, different types of oil stains will be present, including but not limited to rolling oil, stamping oil, drawing oil, drilling oil, cutting oil, lubricating oil, etc. These oil stains will adhere to the metal surface, and with the instantaneous high temperature and high pressure during the processing, the adhesion on the non-ferrous metal surface will become stronger, making it difficult to clean the metal in the next step.

[0004] At present, the pH value of non-ferrous metal water-based cleaning agents on the market is above 11 to ensure good cleaning power. Strong alkaline cleaning agents are dangerous to on-site operators when used, and improper use may also cause corrosion to the cleaning workpiece. In the process of wastewater discharge, strong alkaline cleaning components must be neutralized before discharge. The economic cost of the strong alkaline cleaning agents currently on the market in the subsequent wastewater neutralization and discharge is relatively large.

[0005] Therefore, a weakly alkaline water-based cleaning agent for non-ferrous metals is developed. With its weakly alkaline pH value, the operating safety of the product is improved, the potential corrosion of the product to the workpiece being cleaned is reduced, and the economic cost of subsequent neutralization and discharge of wastewater is reduced. At the same time, its good cleaning power is guaranteed, and its application prospects are broad. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a weakly alkaline water-based nonferrous metal cleaning agent and a preparation method and application thereof.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A weakly alkaline water-based nonferrous metal cleaning agent, the components and weight proportions of which are:

[0009] 0.5-2 parts of detergent, 0.5-3 parts of complexing agent, 0.5-3 parts of penetrant, 1-5 parts of composite non-ferrous metal corrosion inhibitor, 8-18 parts of surfactant, and deionized water to 100 parts.

[0010] Furthermore, the resistivity of the deionized water is greater than 4 MΩ·cm.

[0011] Furthermore, the builder is one or a mixture of two or more of sodium carbonate, potassium carbonate, potassium chloride, potassium carbonate and sodium benzoate.

[0012] Furthermore, the complexing agent is one or a mixture of two or more of disodium ethylenediaminetetraacetate, sodium citrate, sodium gluconate, and sodium polyacrylate.

[0013] Further, the penetrant is fatty alcohol polyoxyethylene ether;

[0014] Alternatively, the composite nonferrous metal corrosion inhibitor is a mixture of a copper corrosion inhibitor, an aluminum corrosion inhibitor and a galvanizing corrosion inhibitor in a mass ratio of 1:2 to 3:1 to 2:1.

[0015] Furthermore, the fatty alcohol polyoxyethylene ether is one or a mixture of two or more of JFC, JFC-2G, JFC-M, JFC-E, and JFC-3;

[0016] The copper corrosion inhibitor is one of benzotriazole, methylbenzotriazole, and sodium mercaptobenzothiazole, or a mixture of two or more thereof; the aluminum corrosion inhibitor is one of sodium silicate, sodium metasilicate pentahydrate, and siloxane ketone, or a mixture of two or more thereof; the zinc plating corrosion inhibitor is one of γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, and 3-mercaptopropyltriethoxysilane, or a mixture of two or more thereof.

[0017] Furthermore, the surfactant is a mixture of a nonionic surfactant and an anionic surfactant in a mass ratio of 10:1 to 3:1.

[0018] Furthermore, the nonionic surfactant is one or two of fatty alcohol EO / PO block polyether and isomeric decanol polyoxyethylene ether; the anionic surfactant is one of sodium dodecylbenzene sulfonate, sodium fatty alcohol ether sulfate, and fatty acid methyl ester ethoxylate sulfonate.

[0019] The preparation method of the weakly alkaline water-based non-ferrous metal cleaning agent as described above comprises the following steps:

[0020] A. Weigh the detergent, complexing agent, penetrant, composite non-ferrous metal corrosion inhibitor, surfactant and deionized water according to the mass ratio;

[0021] B. At room temperature, add deionized water into a stirring kettle, start stirring, and then add a builder, a complexing agent, a penetrant, a composite metal corrosion inhibitor, and a surfactant in sequence;

[0022] C. Stir at a speed of 50-100 r / min for 30-60 min. After mixing evenly, a weakly alkaline water-based non-ferrous metal cleaning agent is obtained.

[0023] The weakly alkaline water-based non-ferrous metal cleaning agent as described above is used in non-ferrous metal cleaning.

[0024] The advantages and positive effects achieved by the present invention are:

[0025] 1. The cleaning agent of the present invention is compounded with a variety of surfactants and a variety of metal corrosion inhibitors and additives. The cleaning agent does not contain harmful substances such as phosphorus, strong alkali, heavy metals, nonylphenol, sodium nitrite, etc. It has the characteristics of weak alkalinity, high cleaning power, fast cleaning speed, no corrosion to non-ferrous metals, easy rinsing, and no residue; the cleaning agent can quickly clean and remove various light and heavy oil stains, dust, stains, etc. on the surfaces of different non-ferrous metals, and has a good cleaning effect.

[0026] 2. The production equipment and process of the cleaning agent of the present invention are simple and easy to implement; the raw materials work together to achieve a good cleaning effect, and can quickly and thoroughly remove various light and heavy oil stains and dirt on the surface of non-ferrous metals; it has good corrosion inhibition and does not damage a variety of non-ferrous metals and their coatings; it is stable, safe, environmentally friendly, non-toxic during transportation, storage, and use, and is friendly to on-site operators; the subsequent economic cost of wastewater neutralization and discharge is small; it is suitable for cleaning different oil stains in multiple application scenarios of non-ferrous metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a picture of a test report from a product testing center for the weakly alkaline water-based nonferrous metal cleaning agent of the present invention;

[0028] Figure 2 This is a picture of the test report of a product testing center for a commercially available non-ferrous metal water-based cleaning agent;

[0029] Figure 3 This is a photo of a field application case 1 of the weakly alkaline water-based nonferrous metal cleaning agent of the present invention;

[0030] Figure 4 This is a photo of a field application case 2 of the weakly alkaline nonferrous metal water-based cleaning agent of the present invention;

[0031] Figure 5 The test data of Example 1, Comparative Examples 1 and 2 of the weakly alkaline water-based non-ferrous metal cleaning agent of the present invention are as follows;

[0032] Figure 6The test data of Example 2 and Comparative Example 3 of the weakly alkaline water-based non-ferrous metal cleaning agent of the present invention;

[0033] Figure 7 The test data of Example 3 and Comparative Examples 4 and 5 of the weakly alkaline water-based non-ferrous metal cleaning agent of the present invention are as follows;

[0034] in, Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 The detection method is well known in the art, namely GB / T 35759-2017. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the embodiments. The following embodiments are descriptive rather than restrictive, and the protection scope of the present invention cannot be limited by the following embodiments.

[0036] The various experimental operations involved in the specific embodiments are all routine techniques in the art. For parts not specially annotated in this document, ordinary technicians in the art can implement them by referring to various commonly used reference books, scientific and technological literature or related instructions, manuals, etc. before the filing date of this invention.

[0037] A weakly alkaline water-based nonferrous metal cleaning agent, the components and weight proportions of which are:

[0038] 0.5-2 parts of detergent, 0.5-3 parts of complexing agent, 0.5-3 parts of penetrant, 1-5 parts of composite non-ferrous metal corrosion inhibitor, 8-18 parts of surfactant, and deionized water to 100 parts.

[0039] Preferably, the resistivity of the deionized water is greater than 4 MΩ·cm.

[0040] Preferably, the builder is one or a mixture of two or more of sodium carbonate, potassium carbonate, potassium chloride, potassium carbonate and sodium benzoate.

[0041] Preferably, the complexing agent is one or a mixture of two or more of disodium ethylenediaminetetraacetate, sodium citrate, sodium gluconate, and sodium polyacrylate.

[0042] Preferably, the penetrant is fatty alcohol polyoxyethylene ether;

[0043] Alternatively, the composite nonferrous metal corrosion inhibitor is a mixture of a copper corrosion inhibitor, an aluminum corrosion inhibitor and a galvanizing corrosion inhibitor in a mass ratio of 1:2 to 3:1 to 2:1.

[0044] Preferably, the fatty alcohol polyoxyethylene ether is one or a mixture of two or more of JFC, JFC-2G, JFC-M, JFC-E, and JFC-3;

[0045] The copper corrosion inhibitor is one of benzotriazole, methylbenzotriazole, and sodium mercaptobenzothiazole, or a mixture of two or more thereof; the aluminum corrosion inhibitor is one of sodium silicate, sodium metasilicate pentahydrate, and siloxane ketone, or a mixture of two or more thereof; the zinc plating corrosion inhibitor is one of γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, and 3-mercaptopropyltriethoxysilane, or a mixture of two or more thereof.

[0046] Preferably, the surfactant is a mixture of a nonionic surfactant and an anionic surfactant in a mass ratio of 10:1 to 3:1.

[0047] Preferably, the nonionic surfactant is one or two of fatty alcohol EO / PO block polyether and isomeric decanol polyoxyethylene ether alkyl-terminated alcohol ether; the anionic surfactant is one of sodium dodecylbenzene sulfonate, sodium fatty alcohol ether sulfate, and fatty acid methyl ester ethoxylate sulfonate.

[0048] The preparation method of the weakly alkaline water-based non-ferrous metal cleaning agent as described above comprises the following steps:

[0049] A. Weigh the detergent, complexing agent, penetrant, composite non-ferrous metal corrosion inhibitor, surfactant and deionized water according to the mass ratio;

[0050] B. At room temperature, add deionized water into a stirring kettle, start stirring, and then add a builder, a complexing agent, a penetrant, a composite metal corrosion inhibitor, and a surfactant in sequence;

[0051] C. Stir at a speed of 50-100 r / min for 30-60 min. After mixing evenly, a weakly alkaline water-based non-ferrous metal cleaning agent is obtained.

[0052] The weakly alkaline water-based non-ferrous metal cleaning agent as described above is used in non-ferrous metal cleaning.

[0053] Specifically, the relevant preparation and detection are as follows:

[0054] Example 1

[0055] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0056] Sodium carbonate 1.0%, disodium ethylenediaminetetraacetate 2.0%, JFC 3.0%, benzotriazole 1.0%, siloxane 2.0%, 3-mercaptopropyltriethoxysilane 1.0%, fatty alcohol EO / PO block polyether 10.0%, sodium dodecylbenzene sulfonate 1.0%, deionized water 79.0%.

[0057] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0058] Add deionized water into a stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add sodium carbonate, disodium ethylenediaminetetraacetate, and benzotriazole, stir until completely dissolved, add JFC, siloxane ketone, and 3-mercaptopropyltriethoxysilane, stir and dissolve, then add fatty alcohol EO / PO block polyether and sodium dodecylbenzene sulfonate until completely dissolved, the entire stirring time is 30 to 60 minutes, and finally a uniform, transparent solution is obtained, thereby obtaining a weakly alkaline non-ferrous metal water-based cleaning agent.

[0059] Comparative Example 1

[0060] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0061] Sodium carbonate 1.0%, disodium ethylenediaminetetraacetate 2.0%, JFC-6 3.0%, benzotriazole 1.0%, siloxane 2.0%, 3-mercaptopropyltriethoxysilane 1.0%, fatty alcohol EO / PO block polyether 10.0%, sodium dodecylbenzene sulfonate 1.0%, deionized water 79.0%.

[0062] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0063] Add deionized water into a stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add sodium carbonate, disodium ethylenediaminetetraacetate, and benzotriazole, stir until completely dissolved, add JFC-6, siloxane ketone, and 3-mercaptopropyltriethoxysilane, stir and dissolve, then add fatty alcohol EO / PO block polyether and sodium dodecylbenzene sulfonate until completely dissolved, the whole stirring time is 30 to 60 minutes, and finally a uniform and transparent solution is obtained, that is, a weakly alkaline non-ferrous metal water-based cleaning agent.

[0064] Comparative Example 2

[0065] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0066] Sodium carbonate 1.0%, disodium ethylenediaminetetraacetate 2.0%, JFC 3.0%, benzotriazole 1.0%, sodium oleate 2.0%, 3-mercaptopropyltriethoxysilane 1.0%, fatty alcohol EO / PO block polyether 10.0%, sodium dodecylbenzene sulfonate 1.0%, deionized water 79.0%.

[0067] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0068] Add deionized water into a stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add sodium carbonate, disodium ethylenediaminetetraacetate, and benzotriazole, and stir until completely dissolved, add JFC, sodium oleate, and 3-mercaptopropyltriethoxysilane, stir and dissolve, then add fatty alcohol EO / PO block polyether and sodium dodecylbenzene sulfonate until completely dissolved, the entire stirring time is 30 to 60 minutes, and finally a uniform, transparent solution is obtained, thereby obtaining a weakly alkaline non-ferrous metal water-based cleaning agent.

[0069] The test results of Example 1, Comparative Example 1 and Comparative Example 2 are shown in Figure 5 .

[0070] Discussion of test results: Figure 5 According to the test results, the cleaning power of Example 1 is 92%, and the cleaning power of Comparative Example 1 is 73%; Example 1 is 92% for H 62 The corrosion level of brass is 1, and the corrosion amount is 1.6 mg. 62 The corrosion level of brass is level 1, and the corrosion amount is 2.2 mg; Example 1 for LY 12 The corrosion level of hard aluminum is 0, and the corrosion amount is 0.9 mg. 12 The corrosion level of hard aluminum is 0, and the corrosion amount is 1.1 mg. From the test results, it can be seen that the cleaning power of Example 1 is better than that of Comparative Example 1, and Example 1 has a better cleaning power than H 62 Brass and LY 12 The corrosion amount of hard aluminum is less than that of comparative example 1. The results show that the cleaning power of Example 1 is stronger than that of Comparative Example 1, and the corrosion amount is lower. The preparation method of Example 1 is the same as that of Comparative Example 1, except that JFC is used in Example 1 and JFC-6 is used in Comparative Example 1. JFC and JFC-6 are both fatty alcohol polyoxyethylene ethers, but JFC-6 has a higher epoxide degree in structure than JFC, with more hydrophilic groups and weaker hydrophobicity of hydrocarbon groups, which reduces the surface tension while also reducing the emulsification ability of grease, which is manifested as a decrease in the cleaning power of Comparative Example 1; the increase in the epoxide degree of JFC-6 has a lower emulsification ability for H 62 Brass and LY 12 The surface metal cations of hard aluminum provide more binding sites, which is shown in the comparative example 1 for H 62 Brass and LY 12The corrosion amount of hard aluminum is relatively large. Therefore, Example 1 has a stronger cleaning power than Comparative Example 1 and a lower corrosion amount.

[0071] from Figure 5 According to the test results, the cleaning power of comparative example 2 is 62%; 62 The corrosion level of brass is 1, and the corrosion amount is 1.5 mg; 12 The corrosion level of hard aluminum is level 1, and the corrosion amount is 2.2 mg. From the test results, it can be seen that the cleaning power of Example 1 is better than that of Comparative Example 2. 62 The corrosion amount of brass is similar to that of Comparative Example 2, but Example 1 has a higher corrosion rate than Comparative Example 2. 12 The corrosion level of hard aluminum is low and the corrosion amount is small. The results show that Example 1 has a stronger cleaning power than Comparative Example 2 and a lower corrosion amount. Example 1 is prepared in the same manner as Comparative Example 2, except that siloxanone is used in Example 1 and sodium oleate is used in Comparative Example 2. Siloxanone and sodium oleate are both aluminum corrosion inhibitors, but the difference is that siloxanone has a cage-like three-dimensional structure, and sodium oleate is a long carbon chain fatty acid salt, and its hydrophobic hydrocarbon chain is longer, and it is far away from the hydrophilic group, and it is not easy to form a stable chelate structure with the binding site. The longer hydrocarbon group of sodium oleate also reduces the emulsification and solubility of oil stains. Siloxanone has a natural cage-like structure, which can be combined with the ionized metal cations on the metal surface to form a stable chelate structure, which inhibits the further ionization of metal ions. At the same time, the hydrophobic hydrocarbon group of siloxanone is shorter, which has little effect on the emulsification and solubility of oil stains. Therefore, it is shown that Example 1 has a stronger cleaning power than Comparative Example 2 and a lower corrosion amount.

[0072] At the same time, it can be seen from Example 1, Comparative Example 1 and Comparative Example 2 that there is a synergistic effect between JFC and siloxane ketone in the weakly alkaline non-ferrous metal water-based cleaning agent of the present invention, which can synergistically improve the relevant properties of the prepared weakly alkaline non-ferrous metal water-based cleaning agent.

[0073] Example 2

[0074] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0075] Potassium carbonate 0.5%, potassium chloride 1.0%, sodium gluconate 1.0%, disodium ethylenediaminetetraacetic acid 1%, JFC-2G 2.0%, benzotriazole 0.5%, sodium mercaptobenzothiazole 0.5%, sodium silicate 1.5%, siloxane 1.5%, γ-aminopropyltrimethoxysilane 1.0%, fatty alcohol EO / PO block polyether 5.0%, isomeric decanol polyoxyethylene ether 5.0%, fatty alcohol ether sodium sulfate 2.0%, deionized water 77.5%.

[0076] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0077] Add deionized water into a stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add potassium carbonate, potassium chloride, sodium gluconate, disodium ethylenediaminetetraacetic acid, benzotriazole, and sodium mercaptobenzothiazole in sequence and stir until completely dissolved, then add JFC-2G, sodium silicate, siloxane ketone, and γ-aminopropyltrimethoxysilane and stir until completely dissolved, then add fatty alcohol EO / PO block polyether, isomeric decanol polyoxyethylene ether, and fatty alcohol ether sodium sulfate and stir until completely dissolved, the whole stirring time is 30 to 60 minutes, and finally a uniform and transparent solution is obtained, namely, a weakly alkaline non-ferrous metal water-based cleaning agent.

[0078] Comparative Example 3

[0079] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0080] Potassium carbonate 0.5%, potassium chloride 1.0%, sodium gluconate 1.0%, disodium ethylenediaminetetraacetic acid 1%, JFC-2G 2.0%, benzotriazole 0.5%, sodium mercaptobenzothiazole 0.5%, sodium silicate 1.5%, siloxane 1.5%, γ-aminopropyltrimethoxysilane 1.0%, fatty alcohol EO / PO block polyether 5.0%, E1309 5.0%, fatty alcohol ether sodium sulfate 2.0%, deionized water 77.5%.

[0081] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0082] Add deionized water into a stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add potassium carbonate, potassium chloride, sodium gluconate, disodium ethylenediaminetetraacetic acid, benzotriazole, and sodium mercaptobenzothiazole in sequence and stir until completely dissolved, then add JFC-2G, sodium silicate, siloxane ketone, and γ-aminopropyltrimethoxysilane and stir until completely dissolved, then add fatty alcohol EO / PO block polyether, E1309, and fatty alcohol ether sodium sulfate and stir until completely dissolved, the whole stirring time is 30 to 60 minutes, and finally a uniform and transparent solution is obtained, that is, a weakly alkaline non-ferrous metal water-based cleaning agent.

[0083] The test results of Example 2 and Comparative Example 3 are shown in Figure 6 .

[0084] Discussion of test results: Figure 6 According to the test results, the cleaning power of Example 2 is 92%, and the cleaning power of Comparative Example 3 is 54%; Example 2 is 92% for H 62 The corrosion level of brass is 1, and the corrosion amount is 1.3 mg. 62 The corrosion level of brass is level 1, and the corrosion amount is 2.1 mg; Example 2 for LY12 The corrosion level of hard aluminum is 0, and the corrosion amount is 0.8 mg. 12 The corrosion level of hard aluminum is level 1, and the corrosion amount is 2.5 mg. From the test results, it can be seen that the cleaning power of Example 2 is better than that of Comparative Example 3, and Example 2 has a better cleaning power than H 62 Brass and LY 12 The corrosion amount of hard aluminum is less than that of comparative example 3. The results show that Example 2 has stronger cleaning power than comparative example 3 and lower corrosion amount. The preparation method of Example 2 is the same as that of comparative example 3, the difference is that isomeric decanol polyoxyethylene ether is used in Example 2, and E1309 is used in comparative example 3. Both isomeric decanol polyoxyethylene ether and E1309 are fatty alcohol polyoxyethylene ethers, but E1309 has a longer carbon chain length in structure, a higher epoxide degree, and more hydrophilic groups than isomeric decanol polyoxyethylene ether, which reduces the surface tension while also reducing the emulsification and solubility of oils and fats, which is manifested as a decrease in the cleaning power of comparative example 3; the increase in the epoxide degree of E1309 has a negative effect on H 62 Brass and LY 12 The surface metal cations of hard aluminum provide more binding sites, which promote the ionization of metal surface ions, as shown in the comparative example 3 for H 62 Brass and LY 12 The corrosion amount of hard aluminum is relatively large. Therefore, Example 2 has a stronger cleaning power than Comparative Example 3 and a lower corrosion amount.

[0085] Example 3

[0086] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0087] Potassium chloride 1.0%, sodium citrate 1.0%, disodium ethylenediaminetetraacetate 0.5%, JFC-M 2.0%, benzotriazole 1.0%, sodium silicate 2.5%, siloxane 0.5%, 3-mercaptopropyltriethoxysilane 1.0%, fatty alcohol EO / PO block polyether 8.0%, sodium dodecylbenzene sulfonate 3.0%, deionized water 79.5%.

[0088] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0089] Add deionized water into a stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add potassium chloride, sodium citrate, disodium ethylenediaminetetraacetate, and benzotriazole in sequence and stir until completely dissolved, then add sodium silicate, siloxane ketone, and 3-mercaptopropyltriethoxysilane and stir until completely dissolved, then add fatty alcohol EO / PO block polyether and sodium dodecylbenzene sulfonate and stir until completely dissolved, the whole stirring time is 30 to 60 minutes, and finally a uniform and transparent solution is obtained, namely, a weakly alkaline non-ferrous metal water-based cleaning agent.

[0090] Comparative Example 4

[0091] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0092] Potassium chloride 1.0%, sodium citrate 1.0%, tetrasodium ethylenediaminetetraacetic acid 0.5%, JFC-M 2.0%, benzotriazole 1.0%, sodium silicate 2.5%, siloxane 0.5%, 3-mercaptopropyltriethoxysilane 1.0%, fatty alcohol EO / PO block polyether 8.0%, sodium dodecylbenzene sulfonate 3.0%, deionized water 79.5%.

[0093] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0094] Add deionized water into a stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add potassium chloride, sodium citrate, tetrasodium ethylenediaminetetraacetic acid, and benzotriazole in sequence and stir until completely dissolved, then add sodium silicate, siloxane ketone, and 3-mercaptopropyltriethoxysilane and stir until completely dissolved, then add fatty alcohol EO / PO block polyether and sodium dodecylbenzene sulfonate and stir until completely dissolved, the whole stirring time is 30 to 60 minutes, and finally a uniform and transparent solution is obtained, namely, a weakly alkaline non-ferrous metal water-based cleaning agent.

[0095] Comparative Example 5

[0096] A weakly alkaline water-based nonferrous metal cleaning agent, the components and the mass percentage of each component are:

[0097] Potassium chloride 1.0%, sodium citrate 1.0%, disodium ethylenediaminetetraacetate 0.5%, JFC-M 2.0%, benzotriazole 1.0%, sodium silicate 2.5%, siloxane 0.5%, 3-mercaptopropyltriethoxysilane 1.0%, Berol 226SA 8.0%, sodium dodecylbenzene sulfonate 3.0%, deionized water 79.5%.

[0098] The preparation method of the above-mentioned weakly alkaline water-based non-ferrous metal cleaning agent comprises the following steps:

[0099] Add deionized water into the stirring kettle at room temperature, start stirring at a speed of 50 to 100 r / min, add potassium chloride, sodium citrate, disodium ethylenediaminetetraacetate, and benzotriazole in sequence and stir until completely dissolved, then add sodium silicate, siloxane ketone, and 3-mercaptopropyltriethoxysilane and stir until completely dissolved, then add Berol 226SA and sodium dodecylbenzenesulfonate and stir until completely dissolved, the whole stirring time is 30 to 60 minutes, and finally a uniform and transparent solution is obtained, that is, a weakly alkaline non-ferrous metal water-based cleaning agent.

[0100] The test results of Example 3, Comparative Example 4 and Comparative Example 5 are shown in Figure 7 .

[0101] Discussion of test results: Figure 7 According to the test results, the cleaning power of Example 3 is 95%, and the cleaning power of Comparative Example 4 is 69%; 62 The corrosion level of brass is 1, and the corrosion amount is 1.4 mg. 62 The corrosion level of brass is level 1, and the corrosion amount is 2.0 mg; Example 3 for LY 12 The corrosion level of hard aluminum is 0, and the corrosion amount is 1.0 mg. 12 The corrosion level of hard aluminum is 0, and the corrosion amount is 1.2 mg. From the test results, it can be seen that the cleaning power of Example 3 is better than that of Comparative Example 4, and Example 3 has a better cleaning power than H 62 Brass and LY 12 The corrosion amount of hard aluminum is less than that of comparative example 4. The results show that Example 3 has stronger cleaning power than comparative example 4 and lower corrosion amount. The preparation methods of Example 3 and Comparative example 4 are the same, the difference is that disodium ethylenediaminetetraacetate is used in Example 3, and tetrasodium ethylenediaminetetraacetate is used in Comparative example 4. Disodium ethylenediaminetetraacetate and tetrasodium ethylenediaminetetraacetate both belong to the class of ethylenediaminetetraacetic acid salts, but tetrasodium ethylenediaminetetraacetate has a higher degree of structural ionization than disodium ethylenediaminetetraacetate, and has a stronger ability to chelate metal ions in the solution. However, correspondingly, the degree of ionization of tetrasodium ethylenediaminetetraacetate is high, and its surface negative charge weakens the adsorption of oil stains, making the oil stains less solubility; and the higher pH value of tetrasodium ethylenediaminetetraacetate promotes the ionization of metal surface ions, which is more sensitive to H 62 Brass and LY 12 The corrosion of hard aluminum is also enhanced. Therefore, Example 3 has a stronger cleaning power than Comparative Example 4 and a lower corrosion rate.

[0102] from Figure 7 According to the test results, the cleaning power of comparative example 5 is 52%; 62 The corrosion level of brass is level 1, and the corrosion amount is 1.5 mg; 12 The corrosion level of hard aluminum is 0, and the corrosion amount is 2.6 mg. From the test results, it can be seen that the cleaning power of Example 3 is better than that of Comparative Example 5, and Example 3 has a better cleaning power than H 62 Brass and LY 12The corrosion amount of hard aluminum is less than that of comparative example 5. The results show that Example 3 has stronger cleaning power than comparative example 5 and lower corrosion amount. The preparation methods of Example 3 and Comparative example 5 are the same, except that fatty alcohol EO / PO block polyether is used in Example 3, and Berol 226SA is used in Comparative example 5. Fatty alcohol EO / PO block polyether and Berol 226SA are both fatty alcohol surfactants, but Berol 226SA is a composite surfactant, which contains a cationic surfactant, and the main component is a nitrogen-containing organic amine derivative. Compared with the anionic surfactant fatty alcohol EO / PO block polyether, the lone pair of electrons on its nitrogen atom can be combined with the hydrogen of the acid molecule in the form of a hydrogen bond, so that the amino group carries a positive charge, but the cationic surfactant is more ionized in an acidic medium, and in an alkaline medium, the positive charge on its amino group is less, and the negative charge binding sites on the surface of the oil stain are reduced, thereby reducing the emulsification and solubility of the oil stain. In alkaline medium, the surface of anionic surfactant fatty alcohol EO / PO block polyether can ionize more positive charges and have more binding sites with oil stains, so it has stronger cleaning power. 62 Brass and LY 12 The dissociation of metal cations on the surface of hard aluminum is promoted, which is manifested as stronger corrosion to it. Therefore, Example 3 has stronger cleaning power than Comparative Example 5, and the amount of corrosion is lower.

[0103] At the same time, it can be seen from Example 3, Comparative Example 4 and Comparative Example 5 that there is a synergistic effect between disodium ethylenediaminetetraacetate and fatty alcohol EO / PO block polyether in the weakly alkaline non-ferrous metal water-based cleaning agent of the present invention, which can synergistically improve the relevant properties of the prepared weakly alkaline non-ferrous metal water-based cleaning agent.

[0104] in addition, Figure 1 This is a picture of a test report from a product testing center for the weakly alkaline water-based nonferrous metal cleaning agent of the present invention; Figure 2 This is a picture of the test report of the product testing center of Huayang Ensai Co., Ltd.'s PWC-401 metal processing grease cleaning agent. Figure 1 and Figure 2 According to the test results, the pH value of the 3% aqueous solution of the weak alkaline non-ferrous metal water-based cleaning agent of the present invention is 8.45, which is weakly alkaline; correspondingly, the pH value of the 3% aqueous solution of a certain commercially available non-ferrous metal water-based cleaning agent is 11.45, which is strongly alkaline. The weak alkaline non-ferrous metal water-based cleaning agent of the present invention has a cleaning power of 92%, 98%, and 95% for standard oil stains, cutting fluids, and processing oils, respectively; correspondingly, the cleaning power of a certain commercially available non-ferrous metal water-based cleaning agent for standard oil stains, cutting fluids, and processing oils, respectively, is 90%, 93%, and 92%. The weak alkaline non-ferrous metal water-based cleaning agent of the present invention has a cleaning power of 92%, 98%, and 95% for standard oil stains, cutting fluids, and processing oils, respectively. 62 Brass, LY 12The corrosion amount of hard aluminum and pure zinc is 1.6mg, 0.9mg, and 1.2mg respectively; correspondingly, the corrosion amount of H 62 Brass, LY 12 The corrosion amount of hard aluminum and pure zinc is 2.4mg, 1.2mg, 1.4mg respectively. According to the test data, the weak alkaline non-ferrous metal water-based cleaning agent of the present invention has a lower pH value than a certain non-ferrous metal water-based cleaning agent on the market, has a stronger cleaning power, a smaller corrosion amount, and has greater application advantages.

[0105] Figure 3 and Figure 4 The on-site application cases 1 and 2 of the weak alkaline non-ferrous metal water-based cleaning agent of the present invention are as follows. According to the on-site process conditions, the dosage of the weak alkaline non-ferrous metal water-based cleaning agent of the present invention is 3% by mass concentration in case 1, and 30L of the product is added to 1000L of tank liquid; the mass fraction concentration used in case 2 is 5%-10%, and 25-50L of the product is added to 500L of tank liquid. The machine test results show that the weak alkaline non-ferrous metal water-based cleaning agent of the present invention can meet customer requirements, effectively remove residual oil stains on the surface of the workpiece, and there is no corrosion on the surface of the workpiece, no white spots remain, mild odor, no irritation, excellent product use effect, safe operation, low subsequent wastewater neutralization and discharge consumption, and meets the use requirements.

[0106] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A weakly alkaline water-based nonferrous metal cleaning agent, characterized in that: Its components and weight parts are: 0.5-2 parts of detergent, 0.5-3 parts of complexing agent, 0.5-3 parts of penetrant, 1-5 parts of composite non-ferrous metal corrosion inhibitor, 8-18 parts of surfactant, and deionized water to 100 parts.

2. The weakly alkaline water-based nonferrous metal cleaning agent according to claim 1, characterized in that: The resistivity of the deionized water is greater than 4 MΩ·cm.

3. The weakly alkaline water-based nonferrous metal cleaning agent according to claim 1, characterized in that: The builder is one or a mixture of two or more of sodium carbonate, potassium carbonate, potassium chloride, potassium carbonate and sodium benzoate.

4. The weakly alkaline water-based nonferrous metal cleaning agent according to claim 1, characterized in that: The complexing agent is one or a mixture of two or more of disodium ethylenediaminetetraacetate, sodium citrate, sodium gluconate and sodium polyacrylate.

5. The weakly alkaline water-based nonferrous metal cleaning agent according to claim 1, characterized in that: The penetrant is fatty alcohol polyoxyethylene ether; Alternatively, the composite nonferrous metal corrosion inhibitor is a mixture of a copper corrosion inhibitor, an aluminum corrosion inhibitor and a galvanizing corrosion inhibitor in a mass ratio of 1:2 to 3:1 to 2:

1.

6. The weakly alkaline water-based nonferrous metal cleaning agent according to claim 5, characterized in that: The fatty alcohol polyoxyethylene ether is one or a mixture of two or more of JFC, JFC-2G, JFC-M, JFC-E and JFC-3; The copper corrosion inhibitor is one of benzotriazole, methylbenzotriazole, and sodium mercaptobenzothiazole, or a mixture of two or more thereof; the aluminum corrosion inhibitor is one of sodium silicate, sodium metasilicate pentahydrate, and siloxane ketone, or a mixture of two or more thereof; the zinc plating corrosion inhibitor is one of γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, and 3-mercaptopropyltriethoxysilane, or a mixture of two or more thereof.

7. The weakly alkaline water-based nonferrous metal cleaning agent according to any one of claims 1 to 6, characterized in that: The surfactant is a mixture of a nonionic surfactant and an anionic surfactant in a mass ratio of 10:1 to 3:

1.

8. The weakly alkaline water-based nonferrous metal cleaning agent according to claim 7, characterized in that: The nonionic surfactant is one or two of fatty alcohol EO / PO block polyether and isomeric decanol polyoxyethylene ether; the anionic surfactant is one of sodium dodecylbenzene sulfonate, sodium fatty alcohol ether sulfate and fatty acid methyl ester ethoxylate sulfonate.

9. The method for preparing the weakly alkaline water-based nonferrous metal cleaning agent according to any one of claims 1 to 8, characterized in that: Here are the steps: A. Weigh the detergent, complexing agent, penetrant, composite non-ferrous metal corrosion inhibitor, surfactant and deionized water according to the mass ratio; B. At room temperature, add deionized water into a stirring kettle, start stirring, and then add a builder, a complexing agent, a penetrant, a composite metal corrosion inhibitor, and a surfactant in sequence; C. Stir at a speed of 50-100 r / min for 30-60 min. After mixing evenly, a weakly alkaline water-based non-ferrous metal cleaning agent is obtained.

10. Use of the weakly alkaline water-based non-ferrous metal cleaning agent according to any one of claims 1 to 8 in cleaning non-ferrous metals.

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