A tank side adjusting agent for vegetable oil-based cutting fluid and a method for preparing the same

Abstract

This invention discloses a groove edge conditioner for vegetable oil-based cutting fluids and its preparation method. The groove edge conditioner is composed of the following components by weight percentage: 35%–40% rust-inhibiting emulsifier, 25% alcohol ether solvent, 25% mixed ether carboxylic acid, 2% antibacterial agent, and water as the balance. The rust-inhibiting emulsifier is prepared by mixing and reacting cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid at a molar ratio of 4–5:1:3 at high temperature. Adding the groove edge conditioner of this invention to a vegetable oil-based cutting fluid bath that has become sticky significantly improves the high-temperature stability of the bath and the rust prevention of cast iron chips, while not affecting the corrosion inhibition performance of aluminum alloys.

Description

Technical Field

[0001] This invention relates to a groove edge conditioner for vegetable oil-based cutting fluids, and also to a method for preparing the aforementioned groove edge conditioner. Technical Background

[0002] Vegetable oil-based cutting fluids offer numerous advantages in machining processes. Their unique molecular structure provides excellent lubrication, effectively improving yield and extending tool life. Secondly, using vegetable oil-based cutting fluids reduces irritation and allergic reactions for operators. Furthermore, waste fluid from vegetable oil-based cutting fluids is easier to treat and degrades more readily than mineral oils. However, vegetable oil molecules are sensitive to mixed oils and hard water. When using water with high hardness to prepare the solution, continuous evaporation and hardness accumulation can easily lead to the formation of a saponification layer and stickiness in the solution, resulting in decreased lubrication performance and difficulty in cleaning parts. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a tank edge conditioner for vegetable oil-based cutting fluids. By adding the tank edge conditioner of this invention to the tank fluid that has formed a saponified layer and become sticky, the tank edge is adjusted, so that the tank fluid returns to its normal working state, thereby extending the service life of the tank fluid. Another purpose of this invention is to provide a method for preparing the above-mentioned tank edge conditioner.

[0004] Technical solution: The groove edge conditioner of the vegetable oil-based cutting fluid of the present invention is composed of the following components by weight percentage: 35% to 40% rust-inhibiting emulsifier, 25% alcohol ether solvent, 25% mixed ether carboxylic acid, 2% antibacterial agent, and water as the balance.

[0005] The rust-inhibiting emulsifier is prepared by reacting cyclohexyldiethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid at a molar ratio of 4–5:1:3 at high temperature. At the corresponding mass ratio, cyclohexyldiethanolamine and diethylene glycolamine can fully react with cyclocarboxypropyl oleic acid, maintaining a favorable pH value to promote antimicrobial activity while exhibiting excellent rust-inhibiting properties and preventing corrosion of aluminum alloys.

[0006] The reaction temperature is 80–90℃ and the reaction time is 60–70 min.

[0007] The alcohol ether solvent is ethylene glycol butyl ether, diethylene glycol butyl ether, or isohexyl glycol.

[0008] The mixed ether carboxylic acid is a mixture of short alkyl chain (C6-8) ether carboxylic acid and long alkyl chain (C16-18) ether carboxylic acid, and is more preferably Kao AKYPO TEC-AM VG (ether carboxylic acid) from Japan.

[0009] The antibacterial agent is N-methyl-dicyclohexylamine.

[0010] The preparation method of the above-mentioned vegetable oil-based cutting fluid groove edge conditioner is as follows: add the prescribed amounts of cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid to a reaction vessel, and heat to 80-90°C while stirring, and react for 60-70 minutes; then add the prescribed amount of water and stir until uniform and transparent; finally add the prescribed amounts of alcohol ether solvent, mixed ether carboxylic acid, and antibacterial agent, and stir until uniform and semi-transparent.

[0011] Adding the edge conditioner of this invention to a vegetable oil-based cutting fluid bath that has become sticky significantly improves the high-temperature stability of the bath and the rust-preventive properties of cast iron chips, without affecting the corrosion inhibition properties of aluminum alloys. The rust-inhibiting emulsifier of this invention effectively emulsifies impurities in the bath and vegetable oils that precipitate due to bath instability, and increases the rust-preventive properties of the system. The alcohol-ether solvent and mixed ether carboxylic acid effectively disperse soap precipitation caused by water hardness accumulation. Furthermore, the system uses a combination of special amines that are beneficial to aluminum alloys, do not affect their corrosion inhibition properties, and also increase the system's antibacterial and anti-corrosion capabilities. The rust-inhibiting emulsifier, alcohol-ether solvent, and mixed ether carboxylic acid work synergistically to improve the stability of the bath.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following significant advancements: When the edge conditioner of the present invention is added to the vegetable oil-based cutting fluid bath that has been used to the point of developing sticky floating matter, whether the bath is used for aluminum alloy or ferrous metal processing, it can adjust the state of the bath to a uniform state, restore the normal lubrication, corrosion inhibition, rust prevention and cleaning functions, and enhance the anti-corrosion ability of the bath; The present invention improves the stability of the bath by the synergistic effect of rust inhibitor emulsifier, alcohol ether solvent and mixed ether carboxylic acid, eliminates sticky substances, and thus improves the cleaning effect. Detailed Implementation

[0013] Example 1

[0014] The groove edge conditioner of the vegetable oil-based cutting fluid of the present invention is composed of the following components by weight percentage: 35% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and water as the balance; wherein, the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 and reacting them at 90°C for 60 min.

[0015] The preparation method of the above-mentioned vegetable oil-based cutting fluid groove edge conditioner is as follows: cyclohexyl diethanolamine, diethylene glycolamine and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 are added to a reaction vessel, and the mixture is heated to 90°C while stirring, and reacted for 60 minutes; then, the prescribed amount of water is added and stirred until uniform and transparent; finally, the prescribed amount of alcohol ether solvent, mixed ether carboxylic acid and antibacterial agent are added and stirred until uniform and semi-transparent.

[0016] Example 2

[0017] The groove edge conditioner of the vegetable oil-based cutting fluid of the present invention is composed of the following components by weight percentage: 38% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and water as the balance; wherein, the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 and reacting them at 90°C for 60 min.

[0018] Example 3

[0019] The groove edge conditioner of the vegetable oil-based cutting fluid of the present invention is composed of the following components by weight percentage: 40% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and water as the balance; wherein, the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 and reacting them at 90°C for 60 min.

[0020] Example 4

[0021] The groove edge conditioner of the vegetable oil-based cutting fluid of the present invention is composed of the following components by weight percentage: 40% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and water as the balance; wherein, the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 4:1:3 and reacting them at 80°C for 70 min.

[0022] Comparative Example 1

[0023] A groove edge conditioner for a vegetable oil-based cutting fluid comprises the following components by weight percentage: 35% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and the balance being water; wherein the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, monoethanolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 and reacting the mixture at 90°C for 60 min.

[0024] Comparative Example 2

[0025] A groove edge conditioner for a vegetable oil-based cutting fluid comprises the following components by weight percentage: 35% rust inhibitor emulsifier, 25% isohexanediol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and the balance being water; wherein the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, monoisopropanolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 and reacting the mixture at 90°C for 60 min.

[0026] Comparative Example 3

[0027] A groove edge conditioner for a vegetable oil-based cutting fluid comprises the following components by weight percentage: 35% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and the balance being water; wherein the rust inhibitor emulsifier is obtained by mixing N-methyldiethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 and reacting the mixture at 90°C for 60 min.

[0028] Comparative Example 4

[0029] A groove edge conditioner for a vegetable oil-based cutting fluid comprises the following components by weight percentage: 35% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and the balance being water; wherein the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, diethylene glycolamine, and ricinoleic acid in a molar ratio of 5:1:3 and reacting the mixture at 90°C for 60 min.

[0030] Comparative Example 5

[0031] A groove edge conditioner for a vegetable oil-based cutting fluid comprises the following components by weight percentage: 35% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and the balance being water; wherein the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 3:1:3 and reacting the mixture at 90°C for 60 min.

[0032] Comparative Example 6

[0033] A groove edge conditioner for a vegetable oil-based cutting fluid comprises the following components by weight percentage: 35% rust inhibitor emulsifier, 25% isohexyl glycol, 25% mixed ether carboxylic acid (AKYPO TEC-AM VG), 2% N-methyl-dicyclohexylamine, and the balance being water; wherein the rust inhibitor emulsifier is obtained by mixing cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 5:1:3 and reacting the mixture at 30°C for 60 min.

[0034] Take a vegetable oil-based cutting fluid bath S1 that has been used for 12 months in an industrial site for processing aluminum alloy and ferrous metal mixtures. At this time, the state of bath S1 is as follows: the appearance of the bath fluid is gray emulsion, the viscosity has increased, and the high temperature stability test shows stratification, phase change and gel-like substances. Divide bath S1 into eight identical bath fluids S1'. Add the working solution of the edge conditioner of Examples 1 to 4 (the mass fraction of the edge conditioner in the working solution is 1%) to four of the bath fluids S1' respectively to obtain samples S2 to S5; add the working solution of the edge conditioner of Comparative Examples 1 to 6 (the mass fraction of the edge conditioner in the working solution is 1%) to the other four bath fluids S1' respectively to obtain samples S6 to S11.

[0035] According to the corrosion test in section 5.7 of JB / T 7453-2013, the discoloration of ADC12 at 55℃±2℃ was tested. Referring to the stability test of the bath solution in section 5.3 of GB / T 6144-2010, 100mL samples of S1 to S9 were placed in a 100mL stoppered graduated cylinder and placed in a constant temperature drying oven at 70±3℃ for 5 hours. After cooling to room temperature for 1 hour, the samples were evaluated to observe for stratification, phase change, and gelatinous phenomena. The rust-preventive performance of S1 to S11 was tested according to GB / T 9189-2016, using tap water for solution preparation. Specific results are shown in Table 1.

[0036] Table 1 shows the test results for samples S1 to S9.

[0037]

[0038] As shown in Table 1, the addition of the groove edge modifiers in Examples 1-4 of this invention to the vegetable oil-based cutting fluid bath used for mixed material processing for 12 months significantly improved the high-temperature stability of the bath and enhanced the rust prevention performance of cast iron chips, without reducing the corrosion inhibition performance of aluminum alloys. The addition of groove edge modifiers in Comparative Examples 1-2 to the cutting fluid bath improved high-temperature stability and enhanced the rust prevention performance of cast iron chips, but reduced the corrosion inhibition performance of aluminum alloys, posing a processing risk. The addition of groove edge modifiers in Comparative Examples 3-4 to the cutting fluid bath improved the rust prevention performance of cast iron chips, but did not improve the stability of the bath. Comparative Example 3 also had a negative impact on the aluminum corrosion inhibition performance of the bath. The addition of groove edge modifiers in Comparative Examples 5-6 to the cutting fluid bath improved the high-temperature stability of the bath, but did not improve the rust prevention performance. Comparative Example 6 also had a certain impact on the aluminum corrosion inhibition performance of the bath.

Claims

1. A groove edge conditioner for a vegetable oil-based cutting fluid, characterized in that, It is composed of the following components by weight percentage: 35%~40% rust-inhibiting emulsifier, 25% alcohol ether solvent, 25% mixed ether carboxylic acid, 2% antibacterial agent, and water as the balance; wherein the antibacterial agent is N-methyl-dicyclohexylamine; The rust-inhibiting emulsifier is prepared by mixing and reacting cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid in a molar ratio of 4-5:1:3 at a reaction temperature of 80-90°C; wherein the reaction time is 60-70 min. Add the above-mentioned edge conditioner to the vegetable oil-based cutting fluid tank that has been used until it has become sticky and has floating matter, so as to restore the tank to its normal working state.

2. The groove edge conditioner for vegetable oil-based cutting fluid according to claim 1, characterized in that: The alcohol ether solvent is ethylene glycol butyl ether, diethylene glycol butyl ether, or isohexyl glycol.

3. The groove edge conditioner for vegetable oil-based cutting fluid according to claim 1, characterized in that: The mixed ether carboxylic acid is a mixture of short-chain alkyl chain ether carboxylic acids and long-chain alkyl chain ether carboxylic acids.

4. The groove edge conditioner for vegetable oil-based cutting fluid according to claim 3, characterized in that: The short alkyl chain ether carboxylic acid is a C6-8 alkyl chain ether carboxylic acid; the long alkyl chain ether carboxylic acid is a C16-18 alkyl chain ether carboxylic acid.

5. The method for preparing the groove edge conditioner of the vegetable oil-based cutting fluid according to claim 1, characterized in that, Specifically, add the prescribed amounts of cyclohexyl diethanolamine, diethylene glycolamine, and cyclocarboxypropyl oleic acid to the reaction vessel, and heat to 80-90°C while stirring, reacting for 60-70 minutes; then add the prescribed amount of water and stir until uniform and transparent; finally, add the prescribed amounts of alcohol ether solvent, mixed ether carboxylic acid, and antibacterial agent, and stir until uniform.

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