No-clean copper cutting fluid and preparation method thereof

Abstract

The invention discloses a no-clean copper cutting fluid and a preparation method thereof. The no-clean copper cutting fluid comprises 50-65 parts of mineral oil, 6-15 parts of an emulsifier, 3-10 parts of DHBN318 boric acid ester amine salt, 3-8 parts of a co-emulsifier, 1-3 parts of a water-based antirust agent, 1-3 parts of a corrosion inhibitor, 1-3 parts of a metal deactivator, 1-3 parts of a water softener, 1-3 parts of a dispersing aid, 1-3 parts of a bactericide, 8-15 parts of deionized water and 0.01-0.1 part of a defoaming agent. According to the no-clean copper cutting fluid and the preparation method thereof, the prepared DHBN318 boric acid ester amine salt with small corrosion to copper is combined with the compounded and optimized corrosion inhibitor to obtain the no-clean copper cutting fluid, and tests show that the copper corrosion inhibition performance is excellent, and the no-clean copper cutting fluid can be used for a no-clean copper processing scene.

Description

Technical Field

[0001] This invention relates to the field of metalworking fluid technology, and in particular to a no-clean copper cutting fluid and its preparation method. Background Technology

[0002] Metalworking fluids are commonly used in non-ferrous metal processing to provide lubrication, cooling, cleaning, and rust prevention. These fluids often contain alkaline substances such as organic amines, which can corrode non-ferrous metals. The usual practice is to add corrosion inhibitors and metal passivators to mitigate this corrosion. Patent CN114854482A discloses a copper cutting fluid that uses special amines AMP95 and methyldiethanolamine as organic bases, combined with copper corrosion inhibitors to obtain a semi-synthetic cutting fluid. However, in this solution, AMP95 and methyldiethanolamine exhibit significant corrosiveness to copper, especially pure copper.

[0003] Most copper cutting fluids on the market require cleaning after machining copper workpieces to prevent corrosion. Residual cutting fluid on the surface of copper workpieces often leads to corrosion because the concentrated cutting fluid becomes more alkaline, accelerating corrosion and causing discoloration. Summary of the Invention

[0004] The purpose of this invention is to provide a no-clean copper cutting fluid and its preparation method. This no-clean copper cutting fluid possesses excellent lubrication, cooling, cleaning, and rust prevention functions. It is free of heavy metals, nitrites, and other substances, making it environmentally friendly, harmless to the human body, and causing minimal skin irritation. It can be widely used in industries such as machining, mold making, aerospace manufacturing, and automobile manufacturing. The no-clean copper cutting fluid exhibits excellent corrosion inhibition properties for copper, causes no corrosion to copper during processing, leaves copper workpieces bright and new, and provides rust prevention for more than 7 days after processing. No cleaning is required after processing, further reducing production costs and eliminating cumbersome cleaning processes.

[0005] To achieve the above objectives, the present invention provides a no-clean copper cutting fluid and its preparation method, comprising 50-65 parts mineral oil, 6-15 parts emulsifier, 3-10 parts DHBN318 borate amine salt, 3-8 parts co-emulsifier, 1-3 parts water-based rust inhibitor, 1-3 parts corrosion inhibitor, 1-3 parts metal passivator, 1-3 parts water softener, 1-3 parts dispersant, 1-3 parts bactericide, 8-15 parts deionized water, and 0.01-0.1 parts defoamer.

[0006] Preferably, the mineral oil has a kinematic viscosity of 28-32 mmHg at 40°C. 2 / s of cycloalkyl mineral oil.

[0007] Preferably, the emulsifier includes one or more of Span 80, NP-10, AEO3, and AEO9; the co-emulsifier includes the emulsifying ester CRODAPriolube 3955.

[0008] Preferably, the DHBN318 borate amine salt comprises a mixture of dihydroxyethylcyclohexylamine, boric acid, and glycidyl ether; the glycidyl ether comprises one or more of allyl glycidyl ether, butyl glycidyl ether, and isooctyl glycidyl ether.

[0009] Preferably, the water-based rust inhibitor includes one of C11 or C12 dicarboxylic acids.

[0010] Preferably, the corrosion inhibitor includes one or more of benzotriazole, benzotrithiazole, or benzotrithiadiazole derivatives; the metal passivator includes benzotriazole.

[0011] Preferably, the water softener comprises a 1:1 mixture of fatty alcohol ether carboxylic acid and EDTA-2Na.

[0012] Preferably, the dispersant comprises dipropylene glycol methyl ether.

[0013] Preferably, the bactericide includes MBM bactericide; the defoamer includes silicone defoamer.

[0014] Preferably, a method for preparing a no-clean copper cutting fluid includes the following steps:

[0015] (1) Preparation of DHBN318 borate amine salt: Boric acid and glycidyl ether were refluxed in the presence of a benzene azeotropic agent, and the water generated in the reaction was separated. The reflux temperature was 90-130℃ and the reflux time was 1-3 hours. Then the temperature was raised to 130℃, dihydroxyethylcyclohexylamine was added, and the reflux reaction was continued until no water was separated. The solvent was then evaporated to obtain DHBN318 borate amine salt;

[0016] (2) Add emulsifier, DHBN318 borate amine salt and co-emulsifier to mineral oil and stir evenly to form composite agent A;

[0017] (3) Add water-based rust inhibitor, corrosion inhibitor, metal passivator, water softener, dispersant and bactericide to deionized water and stir evenly to form composite agent B;

[0018] (4) Add compound agent B to compound agent A, mix well, then add defoamer and stir well.

[0019] Therefore, this invention employs the aforementioned no-clean copper cutting fluid and its preparation method. The no-clean copper cutting fluid possesses excellent lubrication, cooling, cleaning, and rust prevention functions. It is free of heavy metals, nitrites, and other substances, making it environmentally friendly, harmless to the human body, and causing minimal skin irritation. It can be widely applied in industries such as machining, mold making, aerospace manufacturing, and automobile manufacturing. The no-clean copper cutting fluid exhibits excellent copper corrosion inhibition properties, causes no corrosion to copper during processing, leaves copper workpieces bright and new, and provides rust prevention for more than 7 days after processing. No cleaning is required after processing, further reducing production costs and eliminating cumbersome cleaning processes.

[0020] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0021] The technical solution of the present invention will be further described below through embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0023] Example 1

[0024] (1) Preparation of DHBN318 borate amine salt: 6.18 g (0.1 mol) boric acid and 11.4 g (0.1 mol) allyl glycidyl ether were added to a reflux reactor equipped with a water separator. 5.0 g benzene was added, the temperature was raised to 90 °C, and the reaction was carried out for 1.5 h. Then the temperature was raised to 130 °C, and 18.7 g (0.1 mol) dihydroxyethylcyclohexylamine was added. The reflux reaction was continued until no water was separated. The reflux device was changed to a distillation device to distill off the benzene solvent, and a pale yellow viscous liquid borate amine salt (DHBN318) was obtained.

[0025] (2) Add 3.0 g of emulsifier Span 80, 2.0 g of emulsifier AEO9, 6.0 g of compound emulsifier K16, 8.0 g of borate amine salt (DHBN318), and 5.0 g of self-emulsifying ester CRODA Priolube 3955 to 55.0 g of naphthenic mineral oil (kinematic viscosity at 40℃ is 30.90 mm). 2 The mixture is added to a stirring vessel and stirred at 800 r / min for 20 min to obtain composite agent A.

[0026] (3) Add 1.0 g of C12 dicarboxylic acid, 0.3 g of T561, 1.0 g of 2-mercaptobenzothiazole, 0.7 g of DX5810 corrosion inhibitor, 1.0 g of benzotriazole, 0.5 g of fatty alcohol polyoxyethylene ether carboxylic acid AEC-9H, 0.5 g of EDTA-2Na, 1.0 g of dipropylene glycol methyl ether, and 2.0 g of MBM bactericide to 12.95 g of deionized water, and add the mixture to a stirred tank. Stir at 1200 r / min for 30 min to obtain composite agent B.

[0027] (4) Add composite agent B to the reactor containing composite agent A, stir at 800 r / min for 30 min, then add 0.05 g of organosilicon defoamer 1875, stir at 800 r / min for 20 min to obtain a no-clean copper cutting fluid.

[0028] Example 2

[0029] (1) Preparation of borate amine salt (DHBN318): 6.18 g (0.1 mol) boric acid and 13.0 g (0.1 mol) butyl glycidyl ether were added to a reflux reactor equipped with a water separator. 5.0 g benzene was added, the temperature was raised to 90 °C, and the reaction was carried out for 1.5 h. Then the temperature was raised to 130 °C, and 18.7 g (0.1 mol) dihydroxyethylcyclohexylamine was added. The reflux reaction was continued until no water was separated. The reflux device was then replaced with a distillation device to distill off the benzene solvent, and a pale yellow viscous liquid borate amine salt (DHBN318) was obtained.

[0030] (2) Add 3.0 g of emulsifier Span 80, 3.0 g of emulsifier AEO9, 7.0 g of compound emulsifier K16, 8.0 g of borate amine salt (DHBN318), and 6.0 g of self-emulsifying ester CRODA Priolube 3955 to 52.0 g of naphthenic mineral oil (kinematic viscosity at 40℃ is 30.90 mm). 2 The mixture is added to a stirring vessel and stirred at 800 r / min for 20 min to obtain composite agent A.

[0031] (3) Add 1.0 g of C12 dicarboxylic acid, 0.4 g of T561, 0.6 g of 2-mercaptobenzothiazole, 0.5 g of XP542 corrosion inhibitor, 1.5 g of benzotriazole, 0.5 g of fatty alcohol polyoxyethylene ether carboxylic acid AEC-9H, 0.5 g of EDTA-2Na, 1.0 g of dipropylene glycol methyl ether, and 2.0 g of MBM bactericide to 12.95 g of deionized water, and add the mixture to a stirred tank. Stir at 1200 r / min for 30 min to obtain composite agent B.

[0032] (4) Add composite agent B to the reactor containing composite agent A, stir at 800 r / min for 30 min, then add 0.05 g of organosilicon defoamer 1875, stir at 800 r / min for 20 min to obtain a no-clean copper cutting fluid.

[0033] Example 3

[0034] (1) Preparation of borate amine salt (DHBN318): 6.18 g (0.1 mol) boric acid, 13.0 g (0.1 mol) butyl glycidyl ether and 18.6 g (0.1 mol) isooctyl glycidyl ether were added to a reflux reactor equipped with a water separator. 5.0 g benzene was added, the temperature was raised to 90 °C, and the reaction was carried out for 1.5 h. Then the temperature was raised to 130 °C, and 18.7 g (0.1 mol) dihydroxyethylcyclohexylamine was added. The reflux reaction was continued until no water was separated. The reflux device was changed to a distillation device to distill off the benzene solvent, and a pale yellow viscous liquid borate amine salt (DHBN318) was obtained.

[0035] (2) Add 4.0 g of emulsifier Span 80, 3.0 g of emulsifier AEO9, 6.0 g of compound emulsifier K16, 10.0 g of borate amine salt (DHBN318), and 6.0 g of self-emulsifying ester CRODA Priolube 3955 to 50.0 g of naphthenic mineral oil (kinematic viscosity at 40℃ is 30.90 mm). 2 The mixture is added to a stirring vessel and stirred at 800 r / min for 20 min to obtain composite agent A.

[0036] (3) Add 1.0 g of C12 dicarboxylic acid, 0.3 g of T561, 0.3 g of 2-mercaptobenzothiazole, 0.8 g of CU56 corrosion inhibitor, 1.0 g of benzotriazole, 0.5 g of fatty alcohol polyoxyethylene ether carboxylic acid AEC-9H, 0.5 g of EDTA-2Na, 1.0 g of dipropylene glycol methyl ether, and 2.0 g of MBM bactericide to 13.55 g of deionized water, and add the mixture to a stirred tank. Stir at 1200 r / min for 30 min to obtain composite agent B.

[0037] (4) Add composite agent B to the reactor containing composite agent A, stir at 800 r / min for 30 min, then add 0.05 g of organosilicon defoamer 1247, stir at 800 r / min for 20 min to obtain a no-clean copper cutting fluid.

[0038] Comparative Example

[0039] The no-clean copper cutting fluid prepared in Example 1 was compared with a certain brand of copper cutting fluid. The test method was as follows: the cutting fluid was diluted with deionized water to a 10% aqueous solution, and copper test pieces and workpieces were immersed in it. Then, the copper test pieces and workpieces were removed and placed at room temperature for 7 days, and the surface corrosion of the test pieces and workpieces was observed. The test results are shown in Table 1.

[0040] Table 1 Results of Copper Cutting Fluid Cleaning

[0041]

[0042] As shown in Table 1, the copper parts treated with copper cutting fluids in Examples 1, 2, and 3 did not show any corrosion after one week; however, the copper parts treated with a certain brand of commercially available copper cutting fluid showed corrosion after one week.

[0043] Therefore, this invention employs the aforementioned no-clean copper cutting fluid and its preparation method. The no-clean copper cutting fluid possesses excellent lubrication, cooling, cleaning, and rust prevention functions. It is free of heavy metals, nitrites, and other substances, making it environmentally friendly, harmless to the human body, and causing minimal skin irritation. It can be widely applied in industries such as machining, mold making, aerospace manufacturing, and automobile manufacturing. The no-clean copper cutting fluid exhibits excellent copper corrosion inhibition properties, causes no corrosion to copper during processing, leaves copper workpieces bright and new, and provides rust prevention for more than 7 days after processing. No cleaning is required after processing, further reducing production costs and eliminating cumbersome cleaning processes.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A no-clean copper cutting fluid, characterized in that: It includes 50-65 parts mineral oil, 6-15 parts emulsifier, 3-10 parts DHBN318 borate amine salt, 3-8 parts co-emulsifier, 1-3 parts water-based rust inhibitor, 1-3 parts corrosion inhibitor, 1-3 parts metal passivator, 1-3 parts water softener, 1-3 parts dispersant, 1-3 parts bactericide, 8-15 parts deionized water, and 0.01-0.1 parts defoamer.

2. The no-clean copper cutting fluid according to claim 1, characterized in that: The mineral oil has a kinematic viscosity of 28-32 mmHg at 40°C. 2 / s of cycloalkyl mineral oil.

3. The no-clean copper cutting fluid according to claim 1, characterized in that: The emulsifier includes one or more of Span 80, NP-10, AEO3, and AEO9; the co-emulsifier includes the emulsifying ester CRODAPriolube 3955.

4. The no-clean copper cutting fluid according to claim 1, characterized in that: The DHBN318 borate amine salt comprises a mixture of dihydroxyethylcyclohexylamine, boric acid, and glycidyl ether; the glycidyl ether comprises one or more of allyl glycidyl ether, butyl glycidyl ether, and isooctyl glycidyl ether.

5. The no-clean copper cutting fluid according to claim 1, characterized in that: The water-based rust inhibitor includes one of C11 or C12 dicarboxylic acids.

6. The no-clean copper cutting fluid according to claim 1, characterized in that: The corrosion inhibitor includes one or more of benzotriazole, benzotrithiazole, or benzotrithiadiazole derivatives; the metal passivator includes benzotriazole.

7. The no-clean copper cutting fluid according to claim 1, characterized in that: The water softener comprises a 1:1 mixture of fatty alcohol ether carboxylic acid and EDTA-2Na.

8. The no-clean copper cutting fluid according to claim 1, characterized in that: The dispersant includes dipropylene glycol methyl ether.

9. The no-clean copper cutting fluid according to claim 1, characterized in that: The bactericide includes MBM bactericide; the defoamer includes silicone defoamer.

10. A method for preparing a no-clean copper cutting fluid according to claims 1-9, characterized in that: Includes the following steps: (1) Preparation of DHBN318 borate amine salt: Boric acid and glycidyl ether were refluxed in the presence of a benzene azeotropic agent to separate the water generated in the reaction. The reflux temperature was 90-130℃ and the reflux time was 1-3h. Then the temperature was raised to 130℃, dihydroxyethylcyclohexylamine was added, and the reflux reaction was continued until no water was separated. The solvent was then evaporated to obtain DHBN318 borate amine salt. (2) Add emulsifier, DHBN318 borate amine salt and co-emulsifier to mineral oil and stir evenly to form composite agent A; (3) Add water-based rust inhibitor, corrosion inhibitor, metal passivator, water softener, dispersant and bactericide to deionized water and stir evenly to form composite agent B; (4) Add compound agent B to compound agent A, mix well, then add defoamer and stir well.

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