A groove edge treatment agent and a method for preparing the same

Abstract

The application discloses a groove edge treatment agent and a preparation method thereof. The groove edge treatment agent comprises the following components in parts by weight: a bactericide 15-35 parts, an alkanol amine base reserve agent 15-35 parts, a special amine pH stabilizer 5-35 parts, and water 20-50 parts. The application can rapidly increase and restore the pH value of a smelly cutting fluid through the alkanol amine base reserve agent, efficiently kill the bacteria bred in the system through the bactericide, and long-term maintain the alkalinity of the system through the special amine pH stabilizer, so that an acid-alkali balanced environment is constructed through the three components, and the secondary breeding conditions of the bacteria are fundamentally blocked. The treatment agent can completely solve the smelly deterioration problem of the cutting fluid and significantly prolong the service life of the cutting fluid.

Description

Technical Field

[0001] This invention application relates to the technical field of metalworking fluids, specifically to a tank edge treatment agent for treating metalworking fluids and its preparation method. Background Technology

[0002] Metalworking fluids play a vital role in machining processes, including lubrication, cooling, cleaning, and rust prevention. As the machining process continues, metalworking fluids inevitably become contaminated with metal shavings, oil residues, and other contaminants. Especially under complex conditions such as high temperatures, machine shutdowns, and oxygen deficiency, the fluids can easily become a breeding ground for microorganisms.

[0003] Currently, the industry mostly addresses the issue of foul-smelling and deteriorated processing fluids by directly adding bactericides. However, this method often only kills bacteria in the short term and cannot fundamentally restore the chemical balance of the processing fluid. Because bacteria produce acid through metabolism, the pH of the system remains unbalanced after simple sterilization, causing bacteria to multiply rapidly again in a short period, leading to recurring foul-smelling problems.

[0004] Furthermore, the foul odor and deterioration of processing fluids are usually accompanied by a decrease in pH value. This not only weakens the rust-preventive properties of the processing fluid itself, making the processed parts highly susceptible to oxidation and corrosion, but also causes skin allergies for machine operators. Therefore, how to simultaneously achieve long-lasting sterilization and prevent rebound, stabilize the system pH value, and provide protection for metal surfaces is a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the problem that metalworking fluids are prone to odor and rebound due to bacterial growth, accompanied by pH imbalance and metal corrosion, this invention provides a tank edge treatment agent and its preparation method.

[0006] In a first aspect, this invention provides a tank edge treatment agent, comprising, by weight: 15-35 parts of bactericide, 15-35 parts of alkanolamine base stocking agent, 5-35 parts of special amine pH stabilizer, and 20-50 parts of water.

[0007] Preferably, the bactericide is an isothiazolinone bactericide.

[0008] Preferably, the isothiazolinone bactericide is a BK bactericide.

[0009] Preferably, the alkanolamine base stockpile is diethanolamine; the special amine pH stabilizer is a specific amine.

[0010] Furthermore, it also includes 1-10 parts by weight of aluminum protectant and 1-10 parts by weight of copper corrosion inhibitor. The addition of aluminum protectant and copper corrosion inhibitor solves the problems of metal oxidation corrosion and human allergies caused by deterioration of processing fluid.

[0011] Preferably, the aluminum protectant is selected from silicates or phosphates; the copper corrosion inhibitor is selected from benzotriazole or methylbenzotriazole.

[0012] Secondly, the present invention also provides a method for preparing the above-mentioned tank edge treatment agent, comprising the following steps: mixing water, an alkanolamine base stock agent and a special amine pH stabilizer at room temperature until transparent to obtain a base solution; adding a bactericide to the base solution and mixing until transparent to obtain the tank edge treatment agent.

[0013] This preparation method utilizes the water-soluble properties of alkanolamines and special amines. First, a uniform alkaline buffer base solution is constructed, and then a bactericide is introduced, ensuring the dispersibility and activity of the bactericide in a stable pH environment. The process is simple and easy to implement.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) This invention constructs a closed-loop mechanism of "rapid alkali enhancement - sterilization and root removal - long-term alkali stabilization" through the synergy of bactericide, alkanolamine alkali reserve agent and special amine pH stabilizer, which completely solves the problem of cutting fluid odor rebound and achieves long-term stability with one addition.

[0016] (2) It avoids the pH drop and repeated bacterial growth caused by simply adding bactericides, and significantly extends the service life and stability of cutting fluid under complex working conditions such as high temperature and mixed oil contamination.

[0017] (3) The introduction of aluminum protectant and copper corrosion inhibitor effectively inhibits the oxidation and corrosion of sensitive metal parts such as aluminum and copper caused by the deterioration of cutting fluid. At the same time, it greatly reduces the skin allergy caused by bacterial contact for machine operators and improves processing efficiency. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below. This application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0019] The core components and mechanisms of action involved in this invention application have specific technical connotations, which are further explained below:

[0020] Regarding bactericides and BK bactericides: Bactericides are mainly used in metalworking fluids to control microbial growth. The preferred BK bactericide in this application belongs to the isothiazolinone class of compounds, typically a mixture of 2-methyl-4-isothiazolin-3-one and 5-chloro-2-methyl-4-isothiazolin-3-one. Its bactericidal mechanism involves penetrating the cell membrane of microorganisms, attacking intracellular proteins and nucleic acids, blocking cellular respiration and energy metabolism, thereby rapidly leading to bacterial death. In foul-smelling cutting fluids, BK bactericides can quickly kill anaerobic and aerobic bacteria that cause odor, eliminating the odor at its source.

[0021] Regarding alkaline replenishing agents of alkaline compounds: Alkaline amines are amine compounds containing both alkyl and hydroxyl groups. In metalworking fluids, they not only provide alkalinity but also neutralize acidic substances in the system (such as organic acids produced by bacterial metabolism and carboxylic acids produced by lubricant oxidation), thereby rapidly raising and maintaining the pH value of the system. Common alkaline amines include monoethanolamine, diethanolamine, and triethanolamine. Among them, diethanolamine, due to its moderate alkalinity and good water solubility, is often used as the first choice for rapidly replenishing alkaline reserves, and can quickly establish an antibacterial alkaline environment in foul-smelling and acidified cutting fluids.

[0022] Regarding specialty amine pH stabilizers and "specialty amines": In the field of metalworking fluids, "specialty amines" generally refer to a class of aliphatic or aromatic amine derivatives with special molecular structures (such as those containing long-chain alkyl groups, cyclic structures, or multiple amino groups). Unlike alkanolamines, which only provide simple alkaline neutralization, specialty amines can form a strong acid-base buffer system in aqueous solutions. When a small amount of acid is produced in the cutting fluid due to bacterial metabolism, this buffer system can absorb H+ without causing a drastic drop in pH; when the alkalinity of the system fluctuates due to foreign substances, it can release amine groups to maintain pH. Therefore, it is called a "pH stabilizer," which can effectively lock the pH of the cutting fluid within the safe range of 8.5-9.5, fundamentally preventing secondary bacterial growth (i.e., foul odor rebound) caused by pH drops.

[0023] Regarding aluminum protectants and copper corrosion inhibitors: Aluminum is an amphoteric metal, easily corroded and dissolved in both acidic and alkaline cutting fluids. Aluminum protectants (such as silicates and phosphates) can react or adsorb on the aluminum surface, forming a dense silicate or phosphate conversion film that isolates the corrosive medium from contact with the aluminum substrate. Copper and copper alloys are highly susceptible to oxidation, discoloration, and dezincification corrosion. Copper corrosion inhibitors (such as benzotriazoles) rely on the strong coordination between nitrogen atoms in their molecules and copper atoms to form a monolayer complex protective film on the copper surface, effectively inhibiting copper oxidation and corrosion. Simultaneously, this protective film prevents excessive dissolution of copper ions. Copper ions are a significant allergen causing skin allergies in machine operators; therefore, the addition of copper corrosion inhibitors significantly reduces the risk of allergic reactions.

[0024] In a first aspect, embodiments of the present invention provide a tank edge treatment agent, comprising, by weight: 15-35 parts of bactericide, 15-35 parts of alkanolamine base stocking agent, 5-35 parts of special amine pH stabilizer, and 20-50 parts of water.

[0025] The weight parts mentioned in this invention refer to the weight parts of each raw material component. Since the components of the tank edge treatment agent described in this invention mainly undergo physical mixing and dispersion during preparation, without involving chemical reactions to generate new compounds, the raw material ratio is the component content ratio of the tank edge treatment agent product.

[0026] The water used in this invention can be deionized water, distilled water, or industrial water that meets certain standards. Considering the need for long-term storage stability of the cutting fluid side treatment agent, deionized water is preferred to avoid the reaction of calcium and magnesium ions in the water with the amine base stocking agent to produce precipitation, or the chloride ions in the water affecting the activity of the bactericide. If the product is to be prepared and used immediately, treated tap water can also be used.

[0027] In one specific embodiment, the bactericide can be 15, 20, 25, 30, or 35 parts by weight, or any value between them; the alkanolamine base stockpile can be 15, 20, 25, 30, or 35 parts by weight, or any value between them; the special amine pH stabilizer can be 5, 10, 15, 20, 25, 30, or 35 parts by weight, or any value between them; and the water can be 20, 25, 30, 35, 40, 45, or 50 parts by weight, or any value between them. The selection of these values ​​achieves the synergistic effects of rapid alkali enhancement, bactericidal elimination, and long-lasting alkali stabilization described in this invention, solving the technical problem of cutting fluid odor rebound.

[0028] Metalworking fluids are highly susceptible to bacterial growth and spoilage under complex operating conditions, such as prolonged use or shutdown and oxygen deficiency. Through in-depth research, the inventors of this application discovered that the root cause of this odor lies in bacterial metabolism producing acid, leading to a decrease in the system's pH value. This low pH environment, in turn, accelerates bacterial reproduction, creating a vicious cycle of "bacterial acid production - acid reduction promoting bacterial growth." Simply adding bactericides can only temporarily kill bacteria. Once the bactericide is consumed or bacteria re-invade, the low-pH acidified environment will quickly induce secondary infection, resulting in a "rebound odor." Therefore, it is necessary to simultaneously kill bacteria and rapidly restore and stabilize the system's pH value in the long term to break this vicious cycle.

[0029] The groove edge treatment agent provided in this invention application is based on the above findings, solving the aforementioned problems through a three-pronged approach of "rapid alkali enhancement, sterilization and eradication, and long-term alkali stabilization." Alkylamine alkali reserve agents are highly alkaline, rapidly neutralizing acidic metabolites and instantly raising the cutting fluid pH, creating an initial alkaline environment unfavorable to bacterial survival, while simultaneously providing high-activity conditions for the bactericide. Special amine pH stabilizers have excellent buffering capacity, acting like an acid-alkali reservoir, continuously stabilizing the system's pH during long-term processing and preventing pH drop after alkali reserves are depleted. The bactericide exhibits higher activity in a suitable alkaline environment, effectively killing residual bacteria within the system. The combination of these three agents fundamentally blocks the conditions for secondary bacterial growth, preventing rebound. Furthermore, in a stable alkaline environment, aluminum protectants and copper corrosion inhibitors more easily form a dense passivation film on the metal surface, effectively blocking contact between the corrosive medium and the metal substrate, thereby completely resolving corrosion and allergy problems.

[0030] Existing technologies often rely solely on bactericides for shock-type sterilization, but neglect the fact that foul-smelling cutting fluids are essentially caught in a vicious cycle of "bacterial acid production - acid reduction promoting bacterial growth." To completely resolve the issue of odor recurrence, this invention breaks this vicious cycle while simultaneously sterilizing, thereby constructing a synergistic three-pronged defense mechanism of "rapid alkali enhancement - sterilization and eradication - long-lasting alkali stabilization."

[0031] Firstly, alkanolamine base reserves form the first line of defense, rapidly neutralizing acidic metabolites in foul-smelling cutting fluid to raise the system's pH. When cutting fluid becomes severely foul-smelling, the system is highly acidified. Alkanolamine base reserves have a strong neutralizing ability, instantly reversing the acidic environment and quickly raising the pH to a safe range. This rapid alkali-raising effect not only directly inhibits the activity of current bacteria but also creates a suitable alkaline environment for subsequent bactericides to take effect.

[0032] Secondly, the bactericide forms a second line of defense, effectively killing bacteria inside the foul-smelling cutting fluid in the enhanced alkaline environment. In the alkaline environment created by the alkaline reserve components of alkanolamines, the activity of the bactericide is greatly enhanced, enabling it to efficiently penetrate bacterial cell membranes and rapidly kill odor-causing bacteria already proliferating within the system, eliminating odor and acid-producing components at the source.

[0033] Thirdly, specialized amine pH stabilizers form the third line of defense, providing long-term buffering and stabilizing the cutting fluid's pH to prevent secondary bacterial growth. Simply relying on alkali reserves is unsustainable; with the accumulation of residual metabolites after sterilization and re-contamination by impurities, the alkali reserve is easily depleted, leading to a pH drop. Specialized amine pH stabilizers possess excellent buffering capacity, acting like an acid-alkali reservoir, continuously locking in the system's pH during long-term processing, filling the gap left by alkali reserves, and fundamentally blocking the acidic or alkaline conditions necessary for secondary bacterial growth. This is the core mechanism for achieving "anti-rebound."

[0034] These three elements are indispensable and work synergistically: without an alkanolamine alkali reserve, the bactericide's effectiveness is greatly reduced in an acidic environment and it cannot quickly inhibit bacteria; without a bactericide, the source of acid production cannot be eradicated; without a special amine pH stabilizer, once the alkali reserve is depleted, a rebound in odor will inevitably occur. Through the closed-loop coordination of these three lines of defense, this application completely solves the industry problem of cutting fluid odor rebound. Specifically, the alkanolamine alkali reserve can be selected from at least one of monoethanolamine, diethanolamine, and triethanolamine; the special amine pH stabilizer can be selected from special amine buffers with long-chain or cyclic structures.

[0035] In a preferred embodiment, the bactericide is an isothiazolinone bactericide. Isothiazolinone bactericides have broad-spectrum and highly effective bactericidal properties, exhibiting excellent killing effects on bacteria and fungi that cause cutting fluid odor. Specifically, the isothiazolinone bactericide can be selected from 1,2-benzisothiazolin-3-one or 2-methyl-4-isothiazolin-3-one.

[0036] In a preferred embodiment, the isothiazolinone bactericide is a BK bactericide. BK bactericides are commonly used commercial bactericides in the art, exhibiting good water solubility and extremely rapid onset of action. The content of the BK bactericide can be selected from any value among 15, 20, 25, 30, and 35 parts by weight.

[0037] In a preferred embodiment, the alkanolamine base stockpile is diethanolamine; the special amine pH stabilizer is tereamine. Diethanolamine provides the ability to rapidly raise pH; tereamine provides a long-lasting pH buffering capacity. Specifically, the content of diethanolamine can be selected from any value among 20, 22, 25, 28, and 30 parts by weight; the content of tereamine can be selected from any value among 8, 10, 12, and 15 parts by weight.

[0038] In a preferred embodiment, the solution further includes 1-10 parts by weight of an aluminum protectant and 1-10 parts by weight of a copper corrosion inhibitor. The addition of the aluminum protectant and the copper corrosion inhibitor solves the problems of metal oxidation corrosion and human allergies caused by deterioration of the processing fluid.

[0039] In a preferred embodiment, the aluminum protective agent is selected from silicates or phosphates; the copper corrosion inhibitor is selected from benzotriazoles or methylbenzotriazoles. Silicates and phosphates can form a dense protective layer on the aluminum surface; benzotriazoles have excellent corrosion inhibition effects on copper and its alloys, while reducing the risk of sensitization to operators. Specifically, the content of the aluminum protective agent can be selected from any value among 1, 3, 5, 8, and 10 parts by weight; the content of the copper corrosion inhibitor can be selected from any value among 1, 3, 5, 8, and 10 parts by weight.

[0040] In some preferred embodiments, the special amine pH stabilizer may be selected from imported special amines. The content of the special amine pH stabilizer may be selected from any value among 5, 8, 10, 15, 20, 25, 30, and 35 parts by weight.

[0041] In a preferred embodiment, the tank edge treatment agent, by weight, comprises: 20-30 parts of bactericide, 20-30 parts of alkanolamine base stocking agent, 8-15 parts of special amine pH stabilizer, 3-8 parts of aluminum protectant, 3-8 parts of copper corrosion inhibitor, and 25-35 parts of water. Within this preferred range, the synergistic anti-rebound and anti-corrosion effects of the components are optimal. Specifically, the content of each component can be determined based on the actual capacity and odor level of the cutting fluid in the machine.

[0042] This invention also provides a method for preparing the above-mentioned tank edge treatment agent, comprising the following steps: mixing water, an alkanolamine base stock solution, and a special amine pH stabilizer at room temperature until transparent to obtain a base solution; adding a bactericide to the base solution and mixing until transparent to obtain the tank edge treatment agent. This preparation method utilizes the water-soluble properties of alkanolamines and special amines, first constructing a uniform alkaline buffer base solution, and then introducing the bactericide, ensuring the dispersibility and activity of the bactericide in a stable pH environment. The process is simple and easy to implement.

[0043] In a preferred embodiment, after the step of adding the bactericide to the base solution and mixing until transparent, the method further includes adding an aluminum protectant and a copper corrosion inhibitor and mixing until transparent. Adding the corrosion inhibitor last avoids unnecessary consumption during the initial stage of strong alkalinity adjustment.

[0044] In a preferred embodiment, the temperature of all mixing steps is 15-35°C. Room temperature mixing eliminates the need for heating equipment, meeting the requirements for immediate processing at the tank edge, and reducing operational barriers and energy consumption.

[0045] The present invention will be further described in detail below through specific embodiments and comparative examples:

[0046] Example 1:

[0047] This embodiment 1 provides a groove edge treatment agent and its preparation method.

[0048] The raw materials for preparing the tank edge treatment agent in Example 1 include: 25 parts by weight of BK bactericide, 25 parts by weight of diethanolamine, 10 parts by weight of imported tert-amine, 5 parts by weight of aluminum protectant, 5 parts by weight of copper corrosion inhibitor, and 30 parts by weight of deionized water. The aluminum protectant is sodium silicate, purchased from Sinopharm Group; the copper corrosion inhibitor is methylbenzotriazole, purchased from Sinopharm Group.

[0049] The preparation method of the tank edge treatment agent in Example 1 includes: adding 30 parts by weight of deionized water to a stirred tank, adding 25 parts by weight of diethanolamine and 10 parts by weight of imported teramine at room temperature of 25°C, stirring at 200 rpm until the solution is completely transparent to obtain a base solution; adding 25 parts by weight of BK bactericide to the base solution, stirring at 200 rpm until the solution is completely transparent; then adding 5 parts by weight of sodium silicate and 5 parts by weight of methylbenzotriazole, continuing to stir at 200 rpm until completely transparent, filtering to remove impurities, and packaging to obtain the tank edge treatment agent.

[0050] Example 2:

[0051] This embodiment 2 provides a groove edge treatment agent and its preparation method.

[0052] The raw materials for preparing the tank edge treatment agent in Example 2 include: 30 parts by weight of BK bactericide, 20 parts by weight of diethanolamine, 15 parts by weight of imported tert-amine, 5 parts by weight of aluminum protectant, 5 parts by weight of copper corrosion inhibitor, and 20 parts by weight of deionized water. The aluminum protectant is sodium dihydrogen phosphate, purchased from Sinopharm Group; the copper corrosion inhibitor is benzotriazole, purchased from Sinopharm Group.

[0053] The preparation method of the tank edge treatment agent in Example 2 includes: adding 10 parts by weight of deionized water to a stirred tank, adding 20 parts by weight of diethanolamine and 30 parts by weight of imported teramine at room temperature of 30°C, stirring at 250 rpm until the solution is completely transparent to obtain a base solution; adding 30 parts by weight of BK bactericide to the base solution, stirring at 250 rpm until the solution is completely transparent; then adding 5 parts by weight of sodium dihydrogen phosphate and 5 parts by weight of benzotriazole, continuing to stir at 250 rpm until completely transparent, filtering to remove impurities, and packaging to obtain the tank edge treatment agent.

[0054] Example 3:

[0055] This embodiment 3 provides a groove edge treatment agent and its preparation method.

[0056] The raw materials for preparing the tank edge treatment agent in Example 3 include: 25 parts by weight of BK bactericide, 25 parts by weight of diethanolamine, 10 parts by weight of imported terephthalamide, and 40 parts by weight of deionized water.

[0057] The preparation method of the tank edge treatment agent in this embodiment 3 includes: adding 40 parts by weight of deionized water to a stirred tank, adding 25 parts by weight of diethanolamine and 10 parts by weight of imported terephthalamide at room temperature of 20°C, stirring at a speed of 200 rpm until the solution is completely transparent to obtain a base solution; adding 25 parts by weight of BK bactericide to the base solution, stirring at a speed of 200 rpm until the solution is completely transparent, filtering to remove impurities, and packaging to obtain the tank edge treatment agent.

[0058] Comparative Example 1:

[0059] Comparative Example 1 provides a trench edge treatment agent and its preparation method.

[0060] The difference from Example 1 is that Comparative Example 1 lacks the first line of defense (rapid alkali enhancement) and the third line of defense (long-term alkali stabilization), and only relies on the second line of defense (bactericide) for treatment.

[0061] The raw materials for preparing the tank edge treatment agent in Comparative Example 1 include: 25 parts by weight of BK bactericide and 75 parts by weight of deionized water.

[0062] The preparation method of the tank edge treatment agent in Comparative Example 1 includes: adding 75 parts by weight of deionized water to a stirred tank, adding 25 parts by weight of BK bactericide at room temperature of 25°C, stirring at a speed of 200 rpm until the solution is completely transparent, filtering to remove impurities, and packaging to obtain the product.

[0063] Comparative Example 2:

[0064] Comparative Example 2 provides a trench edge treatment agent and its preparation method.

[0065] The difference from Example 1 is that Comparative Example 2 lacks a third line of defense (long-lasting alkali stabilization) and relies only on the first line of defense (rapid alkali enhancement) and the second line of defense (sterilization) to provide short-term effects.

[0066] The raw materials for preparing the tank edge treatment agent in Comparative Example 2 include: 25 parts by weight of BK bactericide, 25 parts by weight of diethanolamine, 5 parts by weight of aluminum protectant, 5 parts by weight of copper corrosion inhibitor, and 40 parts by weight of deionized water. The aluminum protectant is sodium silicate, purchased from Sinopharm Group; the copper corrosion inhibitor is methylbenzotriazole, purchased from Sinopharm Group.

[0067] The preparation method of the tank edge treatment agent in Comparative Example 2 includes: adding 40 parts by weight of deionized water to a stirred tank, adding 25 parts by weight of diethanolamine at room temperature of 25°C, and stirring at 200 rpm until the solution is completely transparent; adding 25 parts by weight of BK bactericide, and stirring at 200 rpm until the solution is completely transparent; then adding 5 parts by weight of sodium silicate and 5 parts by weight of methylbenzotriazole, and continuing to stir at 200 rpm until completely transparent, filtering to remove impurities, and packaging to obtain the product.

[0068] Comparative Example 3:

[0069] Comparative Example 3 provides a trench edge treatment agent and its preparation method.

[0070] The difference from Example 1 is that Comparative Example 3 lacks the first line of defense (rapid alkali extraction) and relies only on the third line of defense (long-term alkali stabilization) and the second line of defense (sterilization).

[0071] The raw materials for preparing the tank edge treatment agent in Comparative Example 3 included: 25 parts by weight of BK bactericide, 10 parts by weight of imported teramine, 5 parts by weight of aluminum protectant, 5 parts by weight of copper corrosion inhibitor, and 55 parts by weight of deionized water. The aluminum protectant was sodium silicate, purchased from Sinopharm Group; the copper corrosion inhibitor was methylbenzotriazole, purchased from Sinopharm Group.

[0072] The preparation method of the tank edge treatment agent of Comparative Example 3 includes: adding 55 parts by weight of deionized water to a stirred tank, adding 10 parts by weight of imported teramine at room temperature of 25°C, and stirring at 200 rpm until the solution is completely transparent; adding 25 parts by weight of BK bactericide, and stirring at 200 rpm until the solution is completely transparent; then adding 5 parts by weight of sodium silicate and 5 parts by weight of methylbenzotriazole, and continuing to stir at 200 rpm until completely transparent, filtering to remove impurities, and packaging to obtain the product.

[0073] To better illustrate the technical effectiveness of the synergistic mechanism of the "rapid alkali enhancement - sterilization and root elimination - long-lasting alkali stabilization" three-line defense of this invention, especially its ability to solve the two major industry pain points of "odor rebound" and "oxidative corrosion," the tank edge treatment agents prepared in Examples 1-3 and Comparative Examples 1-3 were evaluated through actual machine application. The test design focused on examining the impact of the absence of each line of defense (i.e., Comparative Examples 1-3) on the antibacterial longevity and metal protection of the system. The specific performance test methods are as follows:

[0074] Machines with a cutting fluid capacity of 200 kg (approximately 200 L of conventional cutting fluid) and exhibiting yellowing, deterioration, foul odor, and oxidation and corrosion of machined parts were selected as test subjects. To verify the high efficiency of the treatment agent of this invention at low addition levels, the treatment agents prepared in the above embodiments and comparative examples were added at 0.5% or 1.0% of the total weight of the cutting fluid in the machine (i.e., 1 kg or 2 kg of treatment agent were added for each 200 kg of cutting fluid), without replenishing with new fluid, and observed continuously for 7 days.

[0075] Evaluation of antibacterial and deodorizing effects: The essence of odor is the gas produced by the metabolism of bacteria in large numbers. Therefore, the deodorizing effect is objectively evaluated by detecting the total number of bacteria. The plate count method, which is common in this field, is used. The total number of bacteria is detected by taking samples of the machine cutting fluid, and changes in olfactory sensory perception are recorded simultaneously.

[0076] Odor rating level definition:

[0077] "Rebound": A distinctly foul odor is detected by the sense of smell, and the total bacterial count is ≥10^6 cfu / mL (the industry-recognized critical value for the odor of cutting fluid).

[0078] "Reduced by X%": The odor is reduced by a certain percentage, and the total number of bacteria is reduced by the corresponding percentage compared to before the treatment;

[0079] "Restored to normal": No odor is detected by the sense of smell, and the total number of bacteria is ≤10^3 cfu / mL (the industry-recognized standard for clean liquid control).

[0080] Corrosion resistance performance evaluation:

[0081] The corrosion test was conducted using standard metal test pieces, following the corrosion test method specified in GB / T 6144. Given that the foul-smelling cutting fluid system was already in an acidic corrosive state, to realistically simulate the long-term working conditions at the machine tool groove edge, LY12 hard aluminum test pieces and T2 copper test pieces were polished and cleaned, then fully immersed in the cutting fluid samples taken from each machine tool. They were left to stand at room temperature (25±2℃) for 7 days, then removed, cleaned, and their surface changes were observed.

[0082] Corrosion assessment level definition:

[0083] "Non-corrosion": The surface of the test piece is as bright as new, with no discoloration or pitting (qualified).

[0084] "Slight corrosion": The surface of the test piece shows slight discoloration or loss of gloss in some areas, but no visible pitting.

[0085] "Corrosion": The surface of the test piece is obviously blackened, has pitting, or is severely dull (unqualified).

[0086] The test results for each embodiment and comparative example are shown in Table 1 below:

[0087] Group The smell that day 3 days of foul smell 7 days of foul smell Corrosion on the day 3-day corrosion 7-day corrosion Example 1 Reduced by 50% Reduced by 90% Return to normal Non-corrosive Non-corrosive Non-corrosive Example 2 Reduced by 60% Return to normal Return to normal Non-corrosive Non-corrosive Non-corrosive Example 3 Reduced by 50% Reduced by 90% Return to normal Non-corrosive Non-corrosive Slight corrosion Comparative Example 1 Reduced by 50% Reduce by 10% rebound corrosion corrosion corrosion Comparative Example 2 Reduced by 70% Reduced by 30% rebound Non-corrosive Slight corrosion corrosion Comparative Example 3 Reduced by 50% rebound rebound Slight corrosion corrosion corrosion

[0088] Table 1

[0089] As shown in Table 1, the groove edge treatment agents of Examples 1 and 2 of this invention simultaneously possess three lines of defense. When added to foul-smelling and deteriorated cutting fluid at a low dosage of only 0.5%-1.0%, the odor was reduced by more than 90% or even returned to normal within 3 days (total bacterial count dropped below 10^3 cfu / mL). After 7 days, the odor was completely restored without rebound, and no corrosion was observed in the metal test pieces within 7 days, demonstrating excellent long-term anti-rebound and anti-corrosion properties. Example 3, without the addition of a corrosion inhibitor, although exhibiting the same anti-odor and anti-rebound effects as Example 1, showed slight corrosion on the 7th day, indicating that aluminum protectants and copper corrosion inhibitors are indispensable for long-term corrosion resistance.

[0090] Comparing Example 1 and Comparative Example 1, it is evident that Comparative Example 1 lacks both rapid alkali replenishment and long-term alkali stabilization, relying solely on bactericides. Although the odor decreased by 50% on the first day (due to partial bacterial elimination), the total bacterial count rebounded on the third day (odor only decreased by 10%) because the acidified environment could not be reversed or the pH drop prevented. By the seventh day, the total bacterial count exceeded the critical value of 10^6 cf / mL, leading to a complete relapse, and the low pH environment caused continuous metal corrosion. This demonstrates that without alkali reserves and a pH stabilization mechanism, simple bactericides cannot break the vicious cycle of "bacterial acid production - acid reduction promoting bacterial growth."

[0091] Comparing Example 1 and Comparative Example 2, it is evident that Comparative Example 2 lacks a third line of defense (long-term alkali stabilization), relying solely on diethanolamine to provide an initial rapid increase in alkali. Although the odor reduction was greatest on the first day (70%, the high-alkali environment instantly inhibited bacterial activity), as the alkali reserve was consumed by bacterial metabolic acid without any buffer replenishment, the pH began to drop on the third day, and bacteria began to multiply again (odor reduction of 30%), resulting in a complete rebound on the seventh day. Simultaneously, due to pH instability causing the corrosion inhibitor to become ineffective, slight corrosion appeared on the third day, and severe corrosion occurred on the seventh day. This demonstrates that without a long-term pH stabilization mechanism, the short-term strong alkali boost cannot be sustained, inevitably leading to odor and corrosion rebound.

[0092] Comparing Example 1 and Comparative Example 3, it can be seen that Comparative Example 3 lacks a first line of defense (rapid alkali replenishment), only providing buffering, stabilization, and sterilization. The odor decreased by 50% on the first day, but because it could not quickly neutralize the large amount of existing acidic metabolites and rapidly inhibit bacteria, the residual acidic environment continued to suppress the activity of the bactericide, resulting in a rebound on the third day, and the corrosion continued to worsen. This proves that in the early stages of odor deterioration, it is essential to rely on an alkali reserve agent to quickly reverse the acidic environment; otherwise, long-lasting stabilizers will also be ineffective.

[0093] In summary, this invention constructs a synergistic closed-loop mechanism of "rapid alkali enhancement and antibacterial action - long-term alkali stabilization and anti-rebound - sterilization and eradication" through a specific combination of bactericides, alkanolamine alkali stockpilers, and special amine pH stabilizers. This mechanism can completely solve the industry problem of cutting fluid odor and rebound with extremely low addition amounts. Combined with aluminum protectants and copper corrosion inhibitors, it further achieves perfect protection for metals.

[0094] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A tank edge treatment agent, characterized in that, By weight, it includes: 15-35 parts of bactericide, 15-35 parts of alkanolamine base stocking agent, 5-35 parts of special amine pH stabilizer, and 20-50 parts of water.

2. The tank edge treatment agent according to claim 1, characterized in that, The bactericide is an isothiazolinone bactericide.

3. The trench edge treatment agent according to claim 2, characterized in that, The isothiazolinone bactericide is a BK bactericide.

4. The trench edge treatment agent according to claim 1, characterized in that, The alkanolamine base stockpile is diethanolamine; the special amine pH stabilizer is a specific amine.

5. The trench edge treatment agent according to claim 1, characterized in that, It also includes 1-10 parts by weight of aluminum protectant and 1-10 parts by weight of copper corrosion inhibitor.

6. The trench edge treatment agent according to claim 5, characterized in that, By weight, it includes: 20-30 parts bactericide, 20-30 parts alkanolamine base stocking agent, 8-15 parts special amine pH stabilizer, 3-8 parts aluminum protectant, 3-8 parts copper corrosion inhibitor, and 25-35 parts water.

7. The trench edge treatment agent according to claim 5, characterized in that, The aluminum protectant is selected from silicates or phosphates; the copper corrosion inhibitor is selected from benzotriazole or methylbenzotriazole.

8. A method for preparing the trench edge treatment agent according to any one of claims 1-7, characterized in that, The process includes the following steps: mixing water, alkanolamine base stockpile, and special amine pH stabilizer at room temperature until transparent to obtain a base solution; adding a bactericide to the base solution and mixing until transparent to obtain the tank side treatment agent.

9. The preparation method according to claim 8, characterized in that, After the step of adding the bactericide to the base liquid and mixing until transparent, the process also includes the step of adding an aluminum protectant and a copper corrosion inhibitor and mixing until transparent.

10. The preparation method according to claim 8, characterized in that, The temperature for all mixing steps is 15-35℃.