Low-foam cleaning agent with cleaning waste liquid capable of being recycled for cutting fluid as well as preparation method and use method of low-foam cleaning agent

Abstract

The invention relates to a low-foam cleaning agent with cleaning waste liquid capable of being recycled for cutting fluid and a preparation method and a use method thereof, and relates to the technical field of cleaning agents, the low-foam cleaning agent with cleaning waste liquid capable of being recycled for cutting fluid comprises the following raw materials by weight: 2-10% of a silicon-containing low-foam surfactant, 5-15% of alkyl alcohol amine, 5-10% of a surfactant, 5-10% of a surfactant, and the balance of water. The cutting fluid comprises the following components in percentage by weight: 2%-10% of a tricarboxylic acid antirust agent, 1%-5% of hydroxyl organic acid, 0.1%-1.0% of benzotriazole, 1%-5% of short-chain fatty acid, 1%-8% of boric acid, 0.1%-0.5% of dodecyl dimethyl ammonium chloride and the balance of water. The cleaning agent provided by the invention is especially low in foam, strong in cleaning force and free from any corrosion to cast iron, carbon steel and aluminum alloy, waste liquid after cleaning can be directly discharged into a cutting fluid groove in a machine tool, the use of cutting fluid is not influenced, zero wastewater discharge of the cleaning agent is realized, the cleaning agent is more environment-friendly, and the defects of the existing cleaning agent are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning agents, and in particular to a low-foam cleaning agent whose cleaning waste liquid can be reused as cutting fluid, and a preparation method and a use method thereof. Background Art

[0002] In the metal processing industry, cutting fluid and equipment oil are indispensable processing media. Cutting fluid is mainly used to cool, lubricate and clean workpieces and tools during processing to reduce friction, extend tool life and improve processing quality. Equipment oil is used to lubricate mechanical equipment, reduce wear and friction between mechanical parts, and has anti-rust and anti-oxidation functions. However, in the actual processing process, cutting fluid and equipment oil are often not perfectly compatible, resulting in the possibility that equipment oil contaminates cutting fluid, which in turn affects the performance of cutting fluid or even makes it deteriorate and unusable. .

[0003] To solve the above problems, cleaning agents are used to clean the surface of the workpiece after processing to remove the residual oil stains and cutting fluid on the surface. There are many brands of cleaning agents on the market, many of which are of excellent quality, mainly manifested in excellent cleaning power, long life, and safety for cleaning materials. However, no matter how excellent the quality of these cleaning agents is, they will eventually face the environmental protection problem of waste liquid discharge (the waste liquid discharge cycle of the best cleaning agents on the market does not exceed one month), and waste liquid treatment is a large economic burden that enterprises must face. Therefore, solving the problem of waste liquid discharge of cleaning agents has become a current technical priority. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid, and a preparation method and a use method thereof.

[0005] In a first aspect, the present invention provides a low-foam cleaning agent in which the cleaning waste liquid can be reused as a cutting fluid. The low-foam cleaning agent in which the cleaning waste liquid can be reused as a cutting fluid comprises the following raw materials, measured by weight percentage:

[0006] 2%-10% silicon-containing low-foaming surfactant, 5%-15% alkanolamine, 2%-10% tricarboxylic acid rust inhibitor, 1%-5% hydroxy organic acid, 0.1%-1.0% benzotriazole, 1%-5% short-chain fatty acid, 1%-8% boric acid, 0.1%-0.5% dodecyl dimethyl ammonium chloride, and the balance is water;

[0007] The chemical structural formula of the silicon-containing low-foaming surfactant is as follows:

[0008] Wherein, X+Y=11.5; X>Y; R is a C12-C14 straight chain alkane; EO is ethylene oxide; and PO is propylene oxide.

[0009] Furthermore, the product model of the silicon-containing low-foaming surfactant is VOK-3420.

[0010] Furthermore, the alkyl alcohol amine includes at least one of triethanolamine, diethanolamine, monoethanolamine, methyldiethanolamine, 1-isopropanolamine, 2-isopropanolamine, AMP-98, and diglycolamine.

[0011] Furthermore, the chemical structural formula of the tricarboxylic acid rust inhibitor is as follows:

[0012] Among them, the range of n value is: 5-8.

[0013] Furthermore, the product model of the tricarboxylic acid rust inhibitor includes at least one of BASF IRGACOR L190 PLUS, Milin CP65, Lin CP50 and Lupu TAT730.

[0014] Furthermore, the hydroxy organic acid includes at least one of citric acid, glycolic acid, gluconic acid, lactic acid, acetic acid, fumaric acid, tartaric acid, and malic acid; the short-chain fatty acid includes at least one of octanoic acid, nonanoic acid, isononanoic acid, isooctanoic acid, and neodecanoic acid; and the water is deionized water.

[0015] Furthermore, the cleaning waste liquid can be reused in the low-foam cleaning agent for cutting fluid, which includes the following raw materials, measured by weight percentage:

[0016] 3% silicon-containing low-foaming surfactant, 13.5% alkyl alcohol amine, 5% tricarboxylic acid rust inhibitor, 2% hydroxy organic acid, 0.5% benzotriazole, 1.5% short-chain fatty acid, 1% boric acid, 0.2% dodecyl dimethyl ammonium chloride, and the balance is water;

[0017] The product model of the silicon-containing low-foaming surfactant is VOK-3420;

[0018] The alkyl alcohol amine is composed of triethanolamine and monoethanolamine, the weight percentage of the triethanolamine is 8.5%, and the weight percentage of the monoethanolamine is 5.0%;

[0019] The product model of the tricarboxylic acid rust inhibitor is CP65;

[0020] The hydroxy organic acid is lactic acid;

[0021] The short-chain fatty acid is isononanoic acid.

[0022] In a second aspect, the present invention provides a method for preparing a low-foam cleaning agent in which the cleaning waste liquid described in any one of the first aspects can be reused as a cutting fluid, the preparation method comprising the following steps:

[0023] Water is added into a container, heated to 45-55° C. and stirred at a rotation speed of 100-120 rpm, and then alkyl alcohol amine, tricarboxylic acid rust inhibitor, hydroxy organic acid, short-chain fatty acid, benzotriazole, boric acid and dodecyl dimethyl ammonium chloride are added in sequence and stirred to obtain the low-foam cleaning agent.

[0024] In a third aspect, the present invention provides a method for using the low-foam cleaning agent in which the cleaning waste liquid can be reused as a cutting fluid according to any one of the first aspects, the method comprising the following steps:

[0025] The low-foam cleaning agent and water are diluted in a weight ratio of 1: (5-30), and then used in conjunction with a spray cleaning machine at a temperature of 40-60°C.

[0026] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0027] The embodiment of the present invention provides a low-foam cleaning agent that can reuse the cleaning waste liquid for cutting fluid. The cleaning agent provided by the present invention has particularly low foam, strong cleaning power, and does not corrode cast iron, carbon steel, and aluminum alloy. The waste liquid after cleaning can be directly discharged into the cutting fluid tank in the machine tool without affecting the use of the cutting fluid, achieving zero wastewater discharge of the cleaning agent, being more green and environmentally friendly, and making up for the shortcomings of existing cleaning agents. Specifically:

[0028] The introduction of a new silicone-containing surfactant (VOK-3420) has the following characteristics:

[0029] 1. There is no foam at all. After a high-pressure impact of 10MPa, the cumulative height of the foam is less than 1mm in 5 minutes.

[0030] 2. Strong cleaning power, the cleaning rate of various greases is greater than 99.0%.

[0031] 3. It has excellent corrosion inhibition effect on various metal materials (cast iron, aluminum alloy, zinc alloy, copper alloy, magnesium alloy). Adding VOK-3420 cleaning working solution to soak the above metal materials for 48 hours has no oxidation effect.

[0032] 4. The raw material contains carboxyl groups, which have a lubricating effect on metals. The lubrication of the cutting fluid is improved by about 15%.

[0033] 5. Compatible with various cutting fluid systems and does not cause any changes in the cutting fluid usage indicators (foam, lubrication, emulsion stability).

[0034] 6. Because it contains silicon, it has antibacterial properties, which is of great significance for the subsequent reuse of cutting fluid. It can reduce the addition of bactericides in cutting fluid by about 30%. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0037] In a first aspect, the present invention provides a low-foam cleaning agent in which the cleaning waste liquid can be reused as a cutting fluid. The low-foam cleaning agent in which the cleaning waste liquid can be reused as a cutting fluid comprises the following raw materials, measured by weight percentage:

[0038] 2%-10% silicon-containing low-foaming surfactant, 5%-15% alkanolamine, 2%-10% tricarboxylic acid rust inhibitor, 1%-5% hydroxy organic acid, 0.1%-1.0% benzotriazole, 1%-5% short-chain fatty acid, 1%-8% boric acid, 0.1%-0.5% dodecyl dimethyl ammonium chloride, and the balance is water;

[0039] The chemical structural formula of the silicon-containing low-foaming surfactant is as follows:

[0040] Wherein, X+Y=11.5; X>Y; R is a C12-C14 straight chain alkane; EO is ethylene oxide; and PO is propylene oxide.

[0041] The embodiment of the present invention provides a low-foam cleaning agent that can reuse the cleaning waste liquid for cutting fluid. The cleaning agent provided by the present invention has particularly low foam, strong cleaning power, and does not corrode cast iron, carbon steel, and aluminum alloy. The waste liquid after cleaning can be directly discharged into the cutting fluid tank in the machine tool without affecting the use of the cutting fluid, achieving zero wastewater discharge of the cleaning agent, being more green and environmentally friendly, and making up for the shortcomings of existing cleaning agents. Specifically:

[0042] The introduction of a new silicone-containing surfactant (VOK-3420) has the following characteristics:

[0043] 1. There is no foam at all. After a high-pressure impact of 10MPa, the cumulative height of the foam is less than 1mm in 5 minutes.

[0044] 2. Strong cleaning power, the cleaning rate of various greases is greater than 99.0%.

[0045] 3. It has excellent corrosion inhibition effect on various metal materials (cast iron, aluminum alloy, zinc alloy, copper alloy, magnesium alloy). Adding VOK-3420 cleaning working solution to soak the above metal materials for 48 hours has no oxidation effect.

[0046] 4. The raw material contains carboxyl groups, which have a lubricating effect on metals. The lubrication of the cutting fluid is improved by about 15%.

[0047] 5. Compatible with various cutting fluid systems and does not cause any changes in the cutting fluid usage indicators (foam, lubrication, emulsion stability).

[0048] 6. Because it contains silicon, it has antibacterial properties, which is of great significance for the subsequent reuse of cutting fluid. It can reduce the addition of bactericides in cutting fluid by about 30%.

[0049] When VOK-3420 was replaced with German Evonik TEGOPREN5840 (a silicon-containing low-foaming surfactant) and other ingredients remained unchanged, it was found that the above 6 points could not be achieved.

[0050] In some specific embodiments, the product model of the silicon-containing low-foaming surfactant is VOK-3420, and the origin of VOK-3420 is Volker, Germany.

[0051] In some specific embodiments, the alkyl alcohol amine includes at least one of triethanolamine, diethanolamine, monoethanolamine, methyldiethanolamine, 1-isopropanolamine, 2-isopropanolamine, AMP-98, and diglycolamine. Triethanolamine and monoethanolamine are preferred.

[0052] In some specific embodiments, the chemical structural formula of the tricarboxylic acid rust inhibitor is as follows:

[0053] The range of n value is 5-8. Common trade names are: BASF IRGACORL190PLUS; Milin CP65, CP50; Lupu TAT730, etc. Milin CP65 is preferred.

[0054] In some specific embodiments, the short-chain fatty acid includes, but is not limited to, one or more of n-octanoic acid, n-nonanoic acid, isononanoic acid, isooctanoic acid, and neodecanoic acid, preferably isononanoic acid.

[0055] In some specific embodiments, the hydroxy organic acid of the present invention includes but is not limited to citric acid, glycolic acid, gluconic acid, lactic acid, acetic acid, fumaric acid, tartaric acid, and malic acid, preferably lactic acid.

[0056] In terms of weight percentage, the low-foam cleaning agent for the cutting fluid that can be recycled into the cleaning waste liquid includes the following raw materials:

[0057] 3% silicon-containing low-foaming surfactant, 13.5% alkyl alcohol amine, 5% tricarboxylic acid rust inhibitor, 2% hydroxy organic acid, 0.5% benzotriazole, 1.5% short-chain fatty acid, 1% boric acid, 0.2% dodecyl dimethyl ammonium chloride, and the balance is water;

[0058] The product model of the silicon-containing low-foaming surfactant is VOK-3420;

[0059] The alkyl alcohol amine is composed of triethanolamine and monoethanolamine, the weight percentage of the triethanolamine is 8.5%, and the weight percentage of the monoethanolamine is 5.0%;

[0060] The product model of the tricarboxylic acid rust inhibitor is CP65;

[0061] The hydroxy organic acid is lactic acid;

[0062] The short-chain fatty acid is isononanoic acid.

[0063] In a second aspect, the present invention provides a method for preparing a low-foam cleaning agent in which the cleaning waste liquid described in any one of the first aspects can be reused as a cutting fluid, the preparation method comprising the following steps:

[0064] Water is added into a container, heated to 45-55° C. and stirred at a rotation speed of 100-120 rpm, and then alkyl alcohol amine, tricarboxylic acid rust inhibitor, hydroxy organic acid, short-chain fatty acid, benzotriazole, boric acid and dodecyl dimethyl ammonium chloride are added in sequence and stirred to obtain the low-foam cleaning agent.

[0065] In a third aspect, the present invention provides a method for using the low-foam cleaning agent in which the cleaning waste liquid can be reused as a cutting fluid according to any one of the first aspects, the method comprising the following steps:

[0066] The low-foam cleaning agent and water are diluted in a weight ratio of 1: (5-30), and then used in conjunction with a spray cleaning machine at a temperature of 40-60°C.

[0067] In some specific embodiments, the preparation or use method of the present invention is as follows:

[0068] In a 304 stainless steel stirring kettle, add the formulated amount of deionized water and heat to 45-55°C, then start the stirring paddle at a speed of 100-120 rpm.

[0069] II Add the formulated amount of triethanolamine and monoethanolamine in sequence and stir for about 2 minutes until dissolved and transparent.

[0070] III. Heat the formulated amount of CP65, citric acid, isononanoic acid, and benzotriazole in sequence, and stir for 10-20 minutes until dissolved and transparent.

[0071] IV Finally, add the formulated amount of boric acid and dodecyl dimethyl ammonium chloride and stir for 10 minutes until they dissolve transparently.

[0072] The ratio of the patented cleaning agent to water is 1:5-1:30, the operating temperature is 40-60°C, and it is used in conjunction with a high-pressure (10MPA-50MPA) spray cleaning machine.

[0073] It should be noted that the cleaning waste liquid provided in the embodiment of the present invention can be reused in the low-foam cleaning agent for cutting fluid, and the raw materials involved in the preparation method and use method thereof, unless otherwise specified or specifically described, can be directly commercially available products or homemade using existing technologies; the operating steps involved, unless otherwise specified or described, can be carried out in a conventional manner in the art or using existing equipment in the art, and will not be described one by one here.

[0074] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0075] Example 1

[0076] This example provides a low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid. The low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid comprises the following raw materials, measured by weight percentage:

[0077] 3% silicon-containing low-foaming surfactant, 13.5% alkyl alcohol amine, 5% tricarboxylic acid rust inhibitor, 2% hydroxy organic acid, 0.5% benzotriazole, 1.5% short-chain fatty acid, 1% boric acid, 0.2% dodecyl dimethyl ammonium chloride, and the balance is water;

[0078] The product model of the silicon-containing low-foaming surfactant is VOK-3420;

[0079] The alkyl alcohol amine is composed of triethanolamine and monoethanolamine, the weight percentage of the triethanolamine is 8.5%, and the weight percentage of the monoethanolamine is 5.0%;

[0080] The product model of the tricarboxylic acid rust inhibitor is CP65;

[0081] The hydroxy organic acid is lactic acid;

[0082] The short-chain fatty acid is isononanoic acid.

[0083] The preparation method of the above-mentioned low-foam cleaning agent is as follows:

[0084] In a 304 stainless steel stirring kettle, add the formulated amount of deionized water and heat to 45-55°C, then start the stirring paddle at a speed of 100-120 rpm.

[0085] II Add the formulated amount of triethanolamine and monoethanolamine in sequence and stir for about 2 minutes until dissolved and transparent.

[0086] III. Heat the formulated amount of CP65, citric acid, isononanoic acid, and benzotriazole in sequence, and stir for 10-20 minutes until dissolved and transparent.

[0087] IV Finally, add the formulated amount of boric acid and dodecyl dimethyl ammonium chloride and stir for 10 minutes until they dissolve transparently.

[0088] The method of using the above cleaning agent includes: the cleaning agent is diluted with water in a ratio of 1:20, the use temperature is 50°C, and it is used in conjunction with a high-pressure (30MPA) spray cleaning machine.

[0089] Example 2

[0090] This example provides a low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid. The low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid comprises the following raw materials, measured by weight percentage:

[0091] 2% silicon-containing low-foaming surfactant, 5% alkyl alcohol amine, 10% tricarboxylic acid rust inhibitor, 1% hydroxy organic acid, 0.1% benzotriazole, 1% short-chain fatty acid, 8% boric acid, 0.5% dodecyl dimethyl ammonium chloride, and the balance is water;

[0092] The product model of the silicon-containing low-foaming surfactant is VOK-3420;

[0093] The alkyl alcohol amine is triethanolamine;

[0094] The product model of the tricarboxylic acid rust inhibitor is CP50;

[0095] The hydroxy organic acid is tartaric acid;

[0096] The short-chain fatty acid is neodecanoic acid.

[0097] The preparation method and use method of the low-foam cleaning agent that can be used as cutting fluid for the above-mentioned cleaning waste liquid are the same as those in Example 1.

[0098] Example 3

[0099] This example provides a low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid. The low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid comprises the following raw materials, measured by weight percentage:

[0100] 10% silicon-containing low-foaming surfactant, 15% alkyl alcohol amine, 2% tricarboxylic acid rust inhibitor, 5% hydroxy organic acid, 1.0% benzotriazole, 5% short-chain fatty acid, 1% boric acid, 0.1% dodecyl dimethyl ammonium chloride, and the balance is water;

[0101] The product model of the silicon-containing low-foaming surfactant is VOK-3420;

[0102] The alkyl alcohol amine is triethanolamine;

[0103] The product model of the tricarboxylic acid rust inhibitor is CP50;

[0104] The hydroxy organic acid is tartaric acid;

[0105] The short-chain fatty acid is neodecanoic acid.

[0106] Comparative Example 1

[0107] This example provides a low-foam cleaning agent whose cleaning waste liquid can be reused as cutting fluid, and a preparation method and use method thereof. The only difference from Example 1 is that VOK-3420 is replaced by German Evonik TEGOPREN5840.

[0108] Test Case

[0109] In this example, the performance of the low-foam cleaning agent provided by Examples 1 to 3 and Comparative Example 1, which can be reused as a cutting fluid for cleaning waste liquid, was tested. The test results are shown in Table 1.

[0110] Test method: Mix Examples 1 to 3 and Comparative Example 1 with water at a weight ratio of 1:10. Then, carry out cleaning tests in a 40-60°C spray cleaning machine in turn, record the weight of the workpiece before cleaning as M1, and the weight after cleaning as M2, then the cleaning rate is (M1-M2) / M1. Take the wastewater after cleaning of Examples 1 to 3 and Comparative Example 1 from the spray cleaning machine respectively, mix the wastewater with the cutting fluid in a ratio of 1:1, and observe whether the mixed liquid precipitates after being placed at room temperature for 7 days. If there is no precipitation, it means that the wastewater of the cleaning agent is compatible with the cutting fluid, otherwise, it means incompatibility. At the same time, take 50mL of the mixed solution of the wastewater of the cleaning agent and the cutting fluid in a 100mL measuring cylinder, shake it up and down for 5 minutes, and record the cumulative height of the foam in the mixed solution.

[0111] Table 1

[0112]

[0113]

[0114] To sum up, the embodiments of the present invention provide a low-foam cleaning agent whose cleaning waste liquid can be reused as cutting fluid, and a preparation method and use method thereof. The cleaning agent provided by the present invention has particularly low foam, strong cleaning power, and does not cause any corrosion to cast iron, carbon steel, and aluminum alloy. The waste liquid after cleaning can be directly discharged into the cutting fluid tank in the machine tool without affecting the use of the cutting fluid, thereby achieving zero wastewater discharge of the cleaning agent, being more green and environmentally friendly, and making up for the shortcomings of existing cleaning agents.

[0115] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0116] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A low-foam cleaning agent in which the cleaning waste liquid can be reused as cutting fluid, characterized in that: In terms of weight percentage, the low-foam cleaning agent for the cutting fluid that can be recycled into the cleaning waste liquid includes the following raw materials: 2%-10% silicon-containing low-foaming surfactant, 5%-15% alkanolamine, 2%-10% tricarboxylic acid rust inhibitor, 1%-5% hydroxy organic acid, 0.1%-1.0% benzotriazole, 1%-5% short-chain fatty acid, 1%-8% boric acid, 0.1%-0.5% dodecyl dimethyl ammonium chloride, and the balance is water; The chemical structural formula of the silicon-containing low-foaming surfactant is as follows: Wherein, X+Y=11.5; X>Y; R is a C12-C14 straight chain alkane; EO is ethylene oxide; and PO is propylene oxide.

2. The cleaning waste liquid according to claim 1 can be reused as a low-foam cleaning agent for cutting fluid, characterized in that: The product model of the silicon-containing low-foaming surfactant is VOK-3420.

3. The cleaning waste liquid according to claim 1 can be reused as a low-foam cleaning agent for cutting fluid, characterized in that: The alkyl alcohol amine includes at least one of triethanolamine, diethanolamine, monoethanolamine, methyldiethanolamine, 1-isopropanolamine, 2-isopropanolamine, AMP-98, and diglycolamine.

4. The cleaning waste liquid according to claim 1 can be reused as a low-foam cleaning agent for cutting fluid, characterized in that: The chemical structural formula of the tricarboxylic acid rust inhibitor is as follows: Among them, the range of n value is: 5-8.

5. The cleaning waste liquid according to claim 1 can be reused as a low-foam cleaning agent for cutting fluid, characterized in that: The product models of the tricarboxylic acid rust inhibitor include at least one of BASF IRGACOR L190 PLUS, Milin CP65, Lin CP50 and Lupu TAT730.

6. The cleaning waste liquid according to claim 1 can be reused as a low-foam cleaning agent for cutting fluid, characterized in that: The hydroxy organic acid includes at least one of citric acid, glycolic acid, gluconic acid, lactic acid, acetic acid, fumaric acid, tartaric acid, and malic acid; the short-chain fatty acid includes at least one of octanoic acid, nonanoic acid, isononanoic acid, isooctanoic acid, and neodecanoic acid; and the water is deionized water.

7. The cleaning waste liquid according to claim 1 can be reused as a low-foam cleaning agent for cutting fluid, characterized in that: In terms of weight percentage, the low-foam cleaning agent for the cutting fluid that can be recycled into the cleaning waste liquid includes the following raw materials: 3% silicon-containing low-foaming surfactant, 13.5% alkyl alcohol amine, 5% tricarboxylic acid rust inhibitor, 2% hydroxy organic acid, 0.5% benzotriazole, 1.5% short-chain fatty acid, 1% boric acid, 0.2% dodecyl dimethyl ammonium chloride, and the balance is water; The product model of the silicon-containing low-foaming surfactant is VOK-3420; The alkyl alcohol amine is composed of triethanolamine and monoethanolamine, the weight percentage of the triethanolamine is 8.5%, and the weight percentage of the monoethanolamine is 5.0%; The product model of the tricarboxylic acid rust inhibitor is CP65; The hydroxy organic acid is lactic acid; The short-chain fatty acid is isononanoic acid.

8. A method for preparing a low-foam cleaning agent for cutting fluids using the cleaning waste liquid as claimed in any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: Water is added into a container, heated to 45-55° C. and stirred at a rotation speed of 100-120 rpm, and then alkyl alcohol amine, tricarboxylic acid rust inhibitor, hydroxy organic acid, short-chain fatty acid, benzotriazole, boric acid and dodecyl dimethyl ammonium chloride are added in sequence and stirred to obtain the low-foam cleaning agent.

9. A method for using the low-foam cleaning agent of any one of claims 1 to 7 as a cleaning waste liquid that can be reused as a cutting fluid, characterized in that: The method of use comprises the following steps: The low-foam cleaning agent and water are diluted in a weight ratio of 1: (5-30), and then used in conjunction with a spray cleaning machine at a temperature of 40-60°C.

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