A cleaning agent for neodymium iron boron black ash and a preparation method thereof

Abstract

The present application relates to the technical field of neodymium iron boron magnet cleaning, and particularly relates to a cleaning agent for neodymium iron boron black ash and a preparation method thereof, the cleaning agent for neodymium iron boron black ash comprises the following raw materials in percentage by weight: 1-5% enzyme preparation, 0.1-2% corrosion inhibitor, 5-10% penetrating agent, 1-5% solubilizer, 1-5% surfactant, 0.1-1.0% chelating agent, 1-3% ash remover and 5-10% alkaline inorganic additive and water in remainder. The purpose is to not only remove the oil stains on the neodymium iron boron magnet at one time, but also remove the fine black ash on the surface of the neodymium iron boron magnet at the same time, and the neodymium iron boron magnet can have good corrosion inhibition effect, so that subsequent processing is facilitated, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of neodymium iron boron magnetic material cleaning, in particular to a cleaning agent for neodymium iron boron black ash and a preparation method thereof. BACKGROUND

[0002] The main purpose of the alkaline cleaning process before passivation of neodymium iron boron magnetic material is to remove oil and black ash, so as to provide a better surface state for the next process section. At present, the process has a degreasing agent for the purpose of removing oil, which can also remove part of the black ash. However, the effect is not good for removing the fine black ash on the surface of the magnetic material. At present, in the production process, in order to remove the fine black ash on the surface of the magnetic material, multiple water washing or ultrasonic water washing processes are generally adopted to remove the fine black ash, but there are problems of multiple production process procedures and high production cost. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a cleaning agent for neodymium iron boron black ash and a preparation method thereof, which can not only remove the oil stains on the neodymium iron boron magnetic material at one time, but also remove the fine black ash on the surface of the neodymium iron boron magnetic material at the same time, and can have a good corrosion inhibition effect on the neodymium iron boron magnetic material, so as to facilitate subsequent processing and reduce production cost.

[0004] The present application solves the above technical problems by the following technical means:

[0005] A cleaning agent for neodymium iron boron black ash comprises the following raw materials in percentage by weight:

[0006] 1-5% enzyme preparation, 0.1-2% corrosion inhibitor, 5-10% penetrant, 1-5% solubilizer, 1-5% surfactant, 0.1-1.0% chelating agent, 1-3% ash remover, 5-10% alkaline inorganic additive, and water in excess.

[0007] According to the above technical means, through the mutual cooperation of enzyme preparation, surfactant, penetrant, chelating agent and ash remover, not only the oil stains and black ash on the surface of neodymium iron boron can be cleaned, but also the fine black ash can be removed by penetrating into the surface layer of neodymium iron boron; through the action of the corrosion inhibitor, a corrosion protection layer can be formed on the surface of neodymium iron boron, which is beneficial to the protection of the cleaned neodymium iron boron; and the solubilizer and alkaline inorganic additive are more conducive to the cleaning of the oil stains and black ash layer on the surface layer of neodymium iron boron.

[0008] As a preferred, the corrosion inhibitor is one or more combinations of sodium benzoate, triethanolamine, benzotriazole and hexamethylenetetramine.

[0009] Further preferably, the corrosion inhibitor is a mixture of sodium benzoate, triethanolamine and benzotriazole.

[0010] Further preferably, the benzotriazole is a water-soluble benzotriazole.

[0011] More preferably, the mass ratio of sodium benzoate, triethanolamine, and benzotriazole is (1-3):(1-2):1.

[0012] Based on the above technical means, sodium benzoate has a broad-spectrum antimicrobial effect, which can kill existing yeasts, molds, bacteria, etc., thus playing a role in corrosion prevention for the entire cleaning agent; triethanolamine not only has the effect of removing oily dirt, but also has a chelating effect on heavy metal ions and can play a role in corrosion inhibition; while water-soluble benzotriazole has good solubility at room temperature and has a good corrosion inhibition effect, which can play a synergistic corrosion inhibition effect with triethanolamine, making the protective film formed on the material surface more dense.

[0013] Furthermore, the synergistic effect of sodium benzoate, triethanolamine, and benzotriazole is beneficial for the preservation and use of corrosion inhibitors. On the other hand, it can remove surface dirt before corrosion inhibition, resulting in a better corrosion inhibition effect.

[0014] Preferably, the penetrant is one or a combination of higher fatty alcohol polyoxyethylene ether, higher fatty alcohol polyoxypropylene polyoxyethylene ether, sodium polypropylene glycol disulfate, and disodium sulfonated dehydrorosinate.

[0015] A further preferred option is a high-grade fatty alcohol polyoxyethylene ether.

[0016] In a further preferred embodiment, the carbon chain R in the advanced fatty alcohol polyoxyethylene ether has a carbon chain of C7 to 9 and n = 5.

[0017] Based on the above technical means, high-grade fatty alcohol polyoxyethylene ether can not only assist the penetration of other substances, but also emulsify oil stains, making the oil stains form an oil-in-water structure, which is conducive to the separation of oil stains from magnetic materials. During the separation process of oil stains from magnetic materials, some black and gray particles are carried away.

[0018] Preferably, the surfactant is one or more of the following: coconut oil alkyl diethanolamide, coconut oil diethanolamide, fatty alcohol polyoxyethylene ether, sodium lauryl ether sulfate, sodium dodecyl sulfate, and alkylphenol polyoxyethylene ether.

[0019] A further preferred surfactant is coconut oil diethanolamide.

[0020] Based on the above technical means, by using coconut oil diethanolamide as a surfactant, it not only has good detergency, but also good penetration and corrosion resistance, which helps to clean the black ash on the surface of neodymium iron boron materials. It can also be used in conjunction with corrosion inhibitors to make the protective film formed on the surface of neodymium iron boron materials more stable.

[0021] Preferably, the ash remover is one or more of the following: organic amine esters, polyether polyols, ethanolamine esters, ethylenediamine oleate, and sodium salts of organic acids.

[0022] More preferably, the ash remover is a mixture of organic amine esters and sodium salts of organic acids.

[0023] More preferably, the mass ratio of organic amine ester to organic acid sodium salt is 2:1.

[0024] A further preferred option is sodium citrate, which is an organic acid sodium salt.

[0025] Based on the above technical means, by selecting organic amine esters and sodium citrate as composite ash removers, it can not only clean ash, remove the oxide surface layer and complex, but also has a low foaming effect. Moreover, organic amine esters and sodium citrate can have a synergistic effect, thereby removing and complexing the black ash and surface ions on the surface of neodymium iron boron materials, thus achieving good ash removal and corrosion inhibition effects.

[0026] Preferably, the chelating agent is one or a combination of sodium gluconate, disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, and hydroxyethylethylenediaminetriacetic acid.

[0027] More preferably, the chelating agent is a mixture of sodium gluconate and hydroxyethyl ethylenediamine triacetic acid.

[0028] More preferably, the mass ratio of sodium gluconate to hydroxyethyl ethylenediamine triacetic acid is 1:1.

[0029] Based on the above technical means, by selecting sodium gluconate and hydroxyethyl ethylenediamine triacetic acid as chelating agents, not only can multi-level metal ions be chelated, but the material surface can also be cleaned. Thus, in combination with other components, the black ash on the surface of neodymium iron boron materials can be effectively cleaned.

[0030] Preferably, the solubilizer is one or a combination of diethylene glycol monobutyl ether, ethylene glycol butyl ether, and triethylene glycol monobutyl ether.

[0031] A further preferred solubilizer is ethylene glycol butyl ether.

[0032] Based on the above technical means, by selecting ethylene glycol butyl ether as a solubilizer, it can not only play a role in dispersing and wetting, but also increase the solubility of other materials, and also has a washing effect on metal materials, further enhancing the cleaning of black ash on the surface and fine parts of neodymium iron boron materials.

[0033] Preferably, the enzyme preparation is one or more combinations of protease, phytase, microbial enzyme, and protectant.

[0034] More preferably, the enzyme preparation is a mixture of protease and protectant.

[0035] Further preferably, the mass ratio of protease to protectant is 1:2.

[0036] Further preferably, the protease is protease C100.

[0037] Based on the above technical means, protease C100 has good complexing properties for metal materials and good peeling properties. It can dissolve and peel off the black ash on the surface of metal materials, thereby enabling protease C100 to complex metal ions on the surface of neodymium iron boron materials and act as a transition metal ion, thus promoting the peeling process between black ash and neodymium iron boron materials.

[0038] More preferably, the protective agent is one or more combinations of sugars, fatty acids, bovine serum albumin, amino acids, polyols and thiol reagents.

[0039] A further preferred protective agent is a thiol-based reagent.

[0040] More preferably, the thiol reagent is one or a combination of two of cysteine ​​and mercaptoethanol.

[0041] A further preferred option is cysteine ​​as the thiol reagent.

[0042] Based on the above technical means, by selecting cysteine ​​as a protective agent, not only can the protease be protected and its inactivation be prevented, thereby improving the activity of the protease in the cleaning agent and enabling the protease to better clean the black ash on the surface of the metal material, but the protease can also maintain better activity in an alkaline environment.

[0043] Preferably, the alkaline inorganic additive is one or a combination of sodium hydroxide, sodium carbonate, trisodium phosphate, and sodium tripolyphosphate.

[0044] A further preferred option is a mixture of trisodium phosphate and sodium tripolyphosphate.

[0045] More preferably, the mass ratio of trisodium phosphate to sodium tripolyphosphate is 1:(1-2).

[0046] Based on the above-mentioned technical means, on the one hand, trisodium phosphate and sodium tripolyphosphate can be used as alkaline additives to make the solution alkaline and buffer the pH. On the other hand, they can also be used as detergent aids to help improve the cleaning effect on the black ash on the surface of neodymium iron boron materials.

[0047] This application also discloses a method for preparing a cleaning agent for NdFeB black ash, comprising the following steps:

[0048] S1. Add water to the reaction vessel, then add alkaline inorganic additives, stir evenly, and cool to room temperature;

[0049] S2. Add the enzyme preparation to the reaction vessel and stir evenly; then add the corrosion inhibitor, penetrant, surfactant, chelating agent, and descaling agent to the reaction vessel in sequence and stir evenly; finally add the solubilizer to the reaction vessel and stir evenly to obtain a mixture.

[0050] S3. Let the mixture stand to obtain the cleaning agent.

[0051] More preferably, in steps S1 and S2, the stirring speed is 50-200 r / min.

[0052] Further preferably, in step S3, the standing time is 2-12 hours at room temperature.

[0053] Further preferably, in step S3, before settling, a filtration operation is also included, in which an 800-1000 mesh sieve is used for filtration.

[0054] According to the above technical means, filtration is used to remove impurities in the cleaning agent and defoam, which is beneficial to the subsequent process.

[0055] The present application, employing the above-described scheme, has the following beneficial effects:

[0056] 1. By employing a combination of enzymes, surfactants, penetrants, chelating agents, and descaling agents, this cleaning process not only removes oil and ash from the surface of NdFeB magnets but also penetrates deep into the surface layer to remove fine ash. Furthermore, the corrosion inhibitor forms a protective corrosion layer on the NdFeB surface, enhancing its protection after cleaning. The addition of solubilizers and alkaline inorganic additives further facilitates the removal of oil and ash layers from the NdFeB surface.

[0057] 2. Through the synergistic action of chelating agents, penetrants, and desiccant, oil stains and black ash on neodymium iron boron materials can be effectively cleaned. In addition, the use of enzyme preparations can further improve the cleaning effect on black ash on neodymium iron boron materials, thereby reducing subsequent cleaning processes and lowering production costs.

[0058] 3. When using enzyme preparations, by selecting the combination of protease and protectant, not only can the activity of the protease be protected, thereby extending the service life of the enzyme preparation in the cleaning agent, but it can also promote the peeling of black ash from the surface of metal materials. Attached Figure Description

[0059] This application can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0060] Figure 1This is the surface condition of the neodymium iron boron material before cleaning;

[0061] Figure 2 The surface condition of the neodymium iron boron material after cleaning is shown in Comparative Example 1.

[0062] Figure 3 This is the surface condition of the neodymium iron boron material after cleaning in Embodiment 2 of this application. Detailed Implementation

[0063] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0064] A cleaning agent for neodymium iron boron black ash in this embodiment of the application comprises the following raw materials:

[0065] Enzyme preparation: protease C100 and cysteine, with a mass ratio of protease C100 to cysteine ​​of 1:2;

[0066] Corrosion inhibitors: sodium benzoate, triethanolamine and benzotriazole, with a mass ratio of sodium benzoate, triethanolamine and benzotriazole of (1-3):(1-2):1;

[0067] Penetrant: High-grade fatty alcohol polyoxyethylene ether, carbon chain R is C7~9, n=5;

[0068] Surfactant: Coconut oil diethanolamide;

[0069] Chelating agents: sodium gluconate and hydroxyethyl ethylenediamine triacetic acid, with a mass ratio of sodium gluconate to hydroxyethyl ethylenediamine triacetic acid of 1:1;

[0070] Ash removal agent: organic amine ester and sodium citrate, with a mass ratio of organic amine ester to sodium citrate of 2:1;

[0071] Solubilizer: Ethylene glycol butyl ether;

[0072] Alkaline inorganic additives: trisodium phosphate and sodium tripolyphosphate, with a mass ratio of trisodium phosphate to sodium tripolyphosphate of 1:(1-2);

[0073] And the remaining water.

[0074] Example 1: Preparation of a cleaning agent for NdFeB black ash

[0075] S1. Add 50 parts by weight of soft water to the reactor, then add 2.5 parts by weight of trisodium phosphate and 2.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0076] S2. Add 0.5 parts by weight of protease C100 and 1 part by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.3 parts by weight of sodium benzoate, 0.3 parts by weight of triethanolamine and 0.3 parts by weight of benzotriazole, 5 parts by weight of higher fatty alcohol polyoxyethylene ether, 2 parts by weight of coconut oil diethanolamide, 0.3 parts by weight of sodium gluconate, 0.3 parts by weight of hydroxyethyl ethylenediamine triacetic acid, 2 parts by weight of organic amine ester and 1 part by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 3 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0077] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0078] Example 2, Preparation of a cleaning agent for NdFeB black ash

[0079] S1. Add 50 parts by weight of soft water to the reactor, then add 2.5 parts by weight of trisodium phosphate and 5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0080] S2. Add 1 part by weight of protease C100 and 2 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.5 parts by weight of sodium benzoate, 0.5 parts by weight of triethanolamine, 0.25 parts by weight of benzotriazole, 8 parts by weight of higher fatty alcohol polyoxyethylene ether, 3.4 parts by weight of coconut oil diethanolamide, 0.45 parts by weight of sodium gluconate, 0.45 parts by weight of hydroxyethyl ethylenediamine triacetic acid, 2 parts by weight of organic amine ester, and 1 part by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 3.5 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0081] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0082] Example 3: Preparation of a cleaning agent for NdFeB black ash

[0083] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0084] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.2 parts by weight of sodium gluconate, 0.2 parts by weight of hydroxyethyl ethylenediamine triacetic acid, 1.5 parts by weight of organic amine ester, and 0.75 parts by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0085] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0086] Example 4 (Comparative Example 1): Preparation of a cleaning agent for NdFeB black ash

[0087] In this embodiment, no enzyme preparation was added.

[0088] S1. Add 50 parts by weight of soft water to the reactor, then add 2.5 parts by weight of trisodium phosphate and 2.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0089] S2. 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.2 parts by weight of sodium gluconate, 0.2 parts by weight of hydroxyethyl ethylenediamine triacetic acid, 1.5 parts by weight of organic amine ester, and 0.75 parts by weight of sodium citrate are added sequentially to a reaction vessel and stirred at 80 r / min until homogeneous. Finally, 4.6 parts by weight of ethylene glycol butyl ether is added to the reaction vessel and stirred until homogeneous to obtain a mixture.

[0090] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0091] Example 5 (Comparative Example 2): Preparation of a cleaning agent for NdFeB black ash.

[0092] In this embodiment, only protease C100 is added, and cysteine ​​is not added.

[0093] S1. Add 50 parts by weight of soft water to the reactor, then add 2.5 parts by weight of trisodium phosphate and 2.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0094] S2. Add 1.5 parts by weight of protease C100 to the reaction vessel and stir until homogeneous. Then, add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.2 parts by weight of sodium gluconate, 0.2 parts by weight of hydroxyethyl ethylenediamine triacetic acid, 1.5 parts by weight of organic amine ester, and 0.75 parts by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0095] S3. Filter the mixture through an 800-mesh sieve, then let it stand for 3 hours to obtain the cleaning agent.

[0096] Example 6 (Comparative Example 3): Preparation of a cleaning agent for NdFeB black ash

[0097] In this embodiment, no ash removal agent was added.

[0098] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0099] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.2 parts by weight of sodium gluconate, and 0.2 parts by weight of hydroxyethyl ethylenediamine triacetic acid to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0100] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0101] Example 7 (Comparative Example 4): Preparation of a cleaning agent for NdFeB black ash

[0102] In this embodiment, only organic amine esters are used as the ash remover.

[0103] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0104] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.2 parts by weight of sodium gluconate, 0.2 parts by weight of hydroxyethyl ethylenediamine triacetic acid, and 1.5 parts by weight of organic amine ester to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0105] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0106] Example 8 (Comparative Example 5): Preparation of a cleaning agent for NdFeB black ash

[0107] In this embodiment, only sodium citrate is used as the desiccant.

[0108] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0109] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.2 parts by weight of sodium gluconate, 0.2 parts by weight of hydroxyethyl ethylenediamine triacetic acid, and 0.75 parts by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0110] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0111] Example 9 (Comparative Example 6): Preparation of a cleaning agent for NdFeB black ash.

[0112] In this embodiment, no penetrant is used.

[0113] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0114] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 4.6 parts by weight of coconut oil diethanolamide, 0.2 parts by weight of sodium gluconate, 0.2 parts by weight of hydroxyethyl ethylenediamine triacetic acid, 1.5 parts by weight of organic amine ester and 0.75 parts by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0115] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0116] Example 10 (Comparative Example 7): Preparation of a cleaning agent for NdFeB black ash

[0117] In this embodiment, no chelating agent is used.

[0118] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0119] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 1.5 parts by weight of organic amine ester and 0.75 parts by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0120] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0121] Example 11 (Comparative Example 8): Preparation of a cleaning agent for NdFeB black ash.

[0122] In this embodiment, only sodium gluconate is used as the chelating agent.

[0123] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0124] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.5 parts by weight of sodium gluconate, 1.5 parts by weight of organic amine ester and 0.75 parts by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0125] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0126] Example 12 (Comparative Example 9): Preparation of a cleaning agent for NdFeB black ash.

[0127] In this embodiment, the chelating agent used is only hydroxyethyl ethylenediamine triacetic acid.

[0128] S1. Add 50 parts by weight of soft water to the reactor, then add 3 parts by weight of trisodium phosphate and 4.5 parts by weight of sodium tripolyphosphate, stir evenly at 80 r / min, and then cool to room temperature;

[0129] S2. Add 1.5 parts by weight of protease C100 and 3 parts by weight of cysteine ​​to the reaction vessel and stir until homogeneous. Then add 0.6 parts by weight of sodium benzoate, 0.4 parts by weight of triethanolamine, 0.2 parts by weight of benzotriazole, 10 parts by weight of higher fatty alcohol polyoxyethylene ether, 4.6 parts by weight of coconut oil diethanolamide, 0.5 parts by weight of hydroxyethyl ethylenediamine triacetic acid, 1.5 parts by weight of organic amine ester and 0.75 parts by weight of sodium citrate to the reaction vessel in sequence and stir until homogeneous at 80 r / min. Finally, add 4.6 parts by weight of ethylene glycol butyl ether to the reaction vessel and stir until homogeneous to obtain a mixture.

[0130] S3. Filter the mixture through an 800-mesh sieve and let it stand for 3 hours to obtain the cleaning agent.

[0131] The cleaning agents prepared in Examples 1-3 were used to clean unwashed neodymium iron boron magnets (such as... Figure 1 As shown in the figure, a quantitative cleaning test was conducted. The quantitative cleaning test used a white paper quantitative detection method. After cleaning and drying with a cleaning agent, the white paper was rubbed, and the weight difference between the magnetic material and the white paper after rubbing was measured. The test results are shown in Table 1 below:

[0132] Item Example 1 Example 2 Example 3 Appearance, odor Transparent, no irritating odor Transparent, no irritating odor Transparent, no irritating odor Transparent, no irritating odor 99.2 99.4 99.4 Oil removal rate % 300s 300s 300s Oil removal time 99.8 99.8 99.8 Ash removal rate % 300s 300s 300s Ash removal time 0.1 0.08 0.08

[0133] According to the data, the cleaning agents prepared in Examples 1-3 of this application all have good degreasing and descaling effects, effectively removing oil stains and black ash from the surface of neodymium iron boron materials, and effectively cleaning fine black ash from the surface of neodymium iron boron materials, facilitating subsequent processing. Furthermore, Example 2 shows even better degreasing and descaling effects; the cleaned neodymium iron boron magnets exhibit excellent cleaning properties. Black ash residue mg As shown.

[0134] The cleaning agents prepared in Examples 4-12 were tested using the same methods as those in Examples 1-3. The test results are shown in Table 2 below.

[0135]

[0136] Based on the above data, compared with Example 2, Comparative Examples 1-2 showed a significant decrease in degreasing and ash removal efficiency and a significant increase in black ash residue without the addition of enzymes. Therefore, adding enzymes to the cleaning agent can effectively improve degreasing and ash removal efficiency. Furthermore, the addition of a protective agent can enhance the activity of the enzymes, thereby improving the ash removal effect of the cleaning agent. Specifically, the neodymium iron boron magnets cleaned in Comparative Example 1... Figure 3 Figure 2 As shown.

[0137] Comparing the data from Comparative Examples 3-5 with those from Example 2 reveals that, without the addition of a desiccant, the degreasing and desiccant rates of the cleaning agent further decreased. Even with the addition of an enzyme preparation, the degreasing and desiccant efficiencies remained low, indicating a synergistic effect between the enzyme preparation and the desiccant. Furthermore, while adding only organic amine esters or sodium citrate as desiccant improved the degreasing and desiccant rates of neodymium iron boron materials, the effect was still slightly inferior compared to the desiccant mixture of organic amine esters and sodium citrate, suggesting a synergistic desiccant effect between the organic amine esters and sodium citrate.

[0138] Comparing the data from Comparative Example 6 with those from Example 2, it can be seen that without the addition of a penetrant, the degreasing and ash-removing effects of the cleaning agent are significantly reduced. That is, adding a penetrant facilitates the contact between enzyme preparations, ash removers, etc., and the surface of neodymium iron boron materials, thereby improving the degreasing and ash-removing efficiency.

[0139] Comparing the data from Comparative Examples 7-9 with those from Example 2, it can be seen that without the addition of a chelating agent, the cleaning agent's efficiency in removing oil and dust from the surface of neodymium iron boron material is reduced. However, when sodium gluconate or hydroxyethyl ethylenediamine triacetic acid is added as a chelating agent, the cleaning agent's efficiency in removing oil and dust from the surface of neodymium iron boron material is improved compared to the case without the addition of a chelating agent. However, compared to adding a mixture of sodium gluconate and hydroxyethyl ethylenediamine triacetic acid as a chelating agent, the efficiency of the cleaning agent is still reduced. That is, sodium gluconate and hydroxyethyl ethylenediamine triacetic acid can play a synergistic role.

[0140] The foregoing has provided a detailed description of a cleaning agent for NdFeB black ash and its preparation method. The specific embodiments are provided only to aid in understanding the method and core concepts of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this invention.

[0141] It should be noted that: for experimental steps or conditions not specifically specified in the examples, the procedures or conditions described in conventional experimental procedures in the literature of this art can be followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0142] The above examples are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by anyone under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the scope of protection of the present invention.

Claims

1. A cleaning agent for neodymium iron boron black ash, characterized in that, Including the following raw materials by weight percentage: 1-5% enzyme preparation, 0.1-2% corrosion inhibitor, 5-10% penetrant, 1-5% solubilizer, 1-5% surfactant, 0.1-1.0% chelating agent, 1-3% descaling agent, and 5-10% alkaline inorganic additives, with water as the balance; The enzyme preparation is a mixture of protease and protectant, with a mass ratio of protease to protectant of 1:

2. The protease is protease C100, and the protectant is cysteine. The desiccant is a mixture of organic amine ester and organic acid sodium salt, with a mass ratio of organic amine ester to organic acid sodium salt of 2:1, and the organic acid sodium salt is sodium citrate. The penetrant is a high-grade fatty alcohol polyoxyethylene ether, and the chelating agent is a mixture of sodium gluconate and hydroxyethyl ethylenediamine triacetic acid.

2. The cleaning agent according to claim 1, characterized in that, The corrosion inhibitor is one or more of sodium benzoate, triethanolamine, benzotriazole, and hexamethylenetetramine.

3. The cleaning agent according to claim 1, characterized in that, The solubilizer is one or a combination of diethylene glycol monobutyl ether, ethylene glycol butyl ether, and triethylene glycol monobutyl ether.

4. The cleaning agent according to claim 1, characterized in that, The surfactant is one or more of the following: coconut oil alkyl diethanolamide, fatty alcohol polyoxyethylene ether, sodium lauryl alcohol polyoxyethylene ether sulfate, sodium dodecyl sulfate, and alkylphenol polyoxyethylene ether.

5. The cleaning agent according to claim 1, characterized in that, The alkaline inorganic additive is one or more combinations of sodium hydroxide, sodium carbonate, trisodium phosphate, and sodium tripolyphosphate.

6. A method for preparing a cleaning agent for neodymium iron boron black ash as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Add water to the reaction vessel, then add alkaline inorganic additives, stir evenly, and cool to room temperature; S2. Add the enzyme preparation to the reaction vessel and stir evenly; then add the corrosion inhibitor, penetrant, surfactant, chelating agent, and descaling agent to the reaction vessel in sequence and stir evenly; finally add the solubilizer to the reaction vessel and stir evenly to obtain a mixture. S3. Let the mixture stand to obtain the cleaning agent.

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