CN113122355A - Environment-friendly metal cutting fluid and preparation method thereof - Google Patents
Environment-friendly metal cutting fluid and preparation method thereof Download PDFInfo
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- CN113122355A CN113122355A CN202110233977.8A CN202110233977A CN113122355A CN 113122355 A CN113122355 A CN 113122355A CN 202110233977 A CN202110233977 A CN 202110233977A CN 113122355 A CN113122355 A CN 113122355A
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/048—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds
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- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
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- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
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- C10M2207/10—Carboxylix acids; Neutral salts thereof
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- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/127—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic
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- C10M2207/10—Carboxylix acids; Neutral salts thereof
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- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
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- C10M2207/28—Esters
- C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
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- C10M2207/40—Fatty vegetable or animal oils
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- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
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- C10M2207/402—Castor oils
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
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- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
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- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2215/044—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms having cycloaliphatic groups
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- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/221—Six-membered rings containing nitrogen and carbon only
- C10M2215/222—Triazines
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- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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- C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
- C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
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- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/061—Esters derived from boron
Abstract
The invention relates to a green environment-friendly metal cutting fluid and a preparation method and application thereof, wherein the metal cutting fluid comprises the following components: 12-30% of base oil, 12-30% of nonionic surfactant, 2-3% of anionic surfactant, 10-25% of composite antirust agent, 15-20% of composite lubricant, 5-7% of monohydric alcohol, 0.1-0.2% of defoaming agent, 0.8-2.5% of bactericide and the balance of water; the preparation method comprises the steps of firstly heating and mixing the composite antirust agent and part of water, adding the composite lubricant and the auxiliary antirust agent after cooling, uniformly mixing, then respectively adding the nonionic surfactant, the monohydric alcohol and the base oil, finally adding the rest components, and stirring until the solution is clear, thus obtaining the metal cutting fluid. Compared with the prior art, the invention adopts the biodiesel prepared from the illegal cooking oil as the base oil, realizes the resource recycling of the illegal cooking oil and effectively solves the problem that the illegal cooking oil flows into the food market.
Description
Technical Field
The invention belongs to the technical field of metal cutting processing, relates to a green environment-friendly metal cutting fluid and a preparation method thereof, and particularly relates to a green environment-friendly cutting fluid taking biodiesel as base oil and a preparation method thereof.
Background
Environmental resource issues are an important issue facing human beings today. In the metal processing process, metal cutting is a processing method which is widely applied, and great friction and heat are generated between a cutter and a workpiece in the cutting process, so that the processing efficiency and the quality of the workpiece are influenced, and the cutter and equipment are damaged. Therefore, a cutting fluid having excellent lubricating, cooling, cleaning and rust preventing properties is a constantly sought objective in metal cutting.
The traditional metal cutting fluid, for example, the low-foam hard water resistant metal cutting fluid disclosed in chinese patent CN201410367149.3, mostly uses mineral oil as base oil, has poor biodegradability, can remain in water and soil for a long time, and can cause adverse effects on the environment. Therefore, it is necessary to develop and popularize the environment-friendly cutting fluid which has no pollution to the environment, does not damage the human health in the using process and has biodegradability and takes the bio-diesel prepared from the illegal cooking oil as the base oil.
Disclosure of Invention
The invention aims to provide an environment-friendly metal cutting fluid and a preparation method thereof, which are used for solving the technical problem that the metal cutting fluid is difficult to degrade.
The purpose of the invention can be realized by the following technical scheme:
the environment-friendly metal cutting fluid comprises the following components in percentage by weight:
the balance of water.
The illegal cooking oil generally refers to various inferior oils existing in life, such as recycled edible oil, repeatedly used frying oil and the like, and is strictly prohibited to be used in the field of edible oil. The biodiesel prepared by using the illegal cooking oil as the base oil can not only solve the problem that mineral oil in the metal cutting fluid can not be degraded, but also avoid the problem that the illegal cooking oil flows into dining tables.
As a preferred technical scheme, the green environment-friendly metal cutting fluid comprises the following components in percentage by weight:
the balance of water.
Further, the base oil includes at least one of biodiesel prepared from illegal cooking oil, castor oil or soybean oil.
Further, the composite antirust agent comprises a mixture consisting of boric acid triethanolamine ester, monoethanolamine, isopropanolamine, laurin diacid and 1,2, 3-benzotriazole in a mass ratio of (3-8) to (5-10) to (3-8) to (2-6) to (0.1-0.5);
wherein the boric acid triethanolamine ester is obtained by reacting boric acid and triethanolamine at the mass ratio of 1 (2-2.5) at the temperature of 60-80 ℃ for 30-40 min. After the reaction is finished, a small amount of triethanolamine remains, and the added lauric diacid can be used for adjusting the pH value on one hand, can play a role in lubrication on the other hand, and can react with ethanolamine components such as monoethanolamine, isopropanolamine and the remaining triethanolamine on the other hand, so that the generated ethanolamine ester has a good antirust effect.
Further, the composite lubricant comprises at least one of ricinoleic acid, hexapolyricinoleic acid or vegetable oil acid.
Further, the auxiliary rust inhibitor includes dicyclohexylamine; the auxiliary antirust agent is added after the composite lubricant, and is used for improving the antirust performance of the metal cutting fluid on one hand, and reducing the viscosity of the composite lubricant on the other hand, so that excessive composite lubricant is prevented from remaining in a container in the preparation process, and the difficulty in preparation operation of the metal cutting fluid is increased.
The monohydric alcohol comprises at least one of dodecanol, tridecanol or tetradecanol, has the function of solubilizing water in the formula, can be used in a low-temperature environment due to simple molecular structure and low freezing point, and is favorable for expanding the use conditions of the metal cutting fluid.
Further, the non-ionic surfactant comprises at least one of polyoxyethylene ether surfactant or tween 85.
Further, the polyoxyethylene ether surfactant comprises at least one of fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether;
the fatty alcohol-polyoxyethylene ether comprises at least one of isomeric tridecanol polyoxyethylene ether, C9-11 alcohol polyoxyethylene ether, isomeric decyl alcohol polyoxyethylene ether, oleyl alcohol polyoxyethylene ether and propylene glycol polyoxyethylene ether.
Further, the anionic surfactant comprises sodium petroleum sulfonate.
Further, the defoaming agent comprises a silicone defoaming agent or a polyether defoaming agent;
the bactericide comprises at least one of s-triazine or isothiazolinone.
A preparation method of green environment-friendly metal cutting fluid comprises the following steps:
1) mixing the composite antirust agent with part of water at 60-80 ℃ and stirring for 20-40 min;
2) cooling to 30-40 deg.C, adding compound lubricant and auxiliary antirust agent, and stirring for 20-40 min;
3) adding nonionic surfactant, monohydric alcohol and base oil, and stirring for 20-40 min;
4) adding the rest water, anionic surfactant, bactericide and defoaming agent, and stirring until the solution is clear to obtain the metal cutting fluid.
Compared with the prior art, the invention has the following characteristics:
1) the metal cutting fluid prepared by the invention does not contain components such as nitrite, heavy metal, toxic solvent and the like, and has no pollution to the environment, the used base oil comprises biodiesel prepared from illegal cooking oil, the resource recycling of the illegal cooking oil is realized, and the problem that the illegal cooking oil flows into the food market is effectively solved, therefore, the metal cutting fluid prepared by the invention belongs to a green and environment-friendly product with zero pollution emission supported by the state;
2) the invention has scientific and reasonable formula, ensures that each component is specially compounded by adjusting the content of each additive, plays a role to the maximum extent, ensures that the prepared cutting fluid has excellent cleaning property, antirust property, emulsion stability and good defoaming property, has unique advantages in the aspects of lubrication and bacteriostasis, can be widely applied to various processing materials, and in addition, the processing waste liquid is easy to treat and can be treated according to common industrial waste water after demulsification.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The environment-friendly metal cutting fluid comprises the following components in percentage by weight:
wherein the base oil comprises at least one of biodiesel, castor oil, or soybean oil prepared from illegal cooking oil;
the composite antirust agent comprises a mixture of boric acid triethanolamine ester, monoethanolamine, isopropanolamine, lauryldicarboxylic acid and 1,2, 3-benzotriazole in a mass ratio of (3-8) to (5-10) to (3-8) to (2-6) to (0.1-0.5);
the composite lubricant comprises at least one of lauric dibasic acid, ricinoleic acid, hexa-poly ricinoleic acid or vegetable oil acid;
the auxiliary rust inhibitor comprises dicyclohexylamine;
the monohydric alcohol comprises at least one of dodecanol, tridecanol or tetradecanol;
the nonionic surfactant comprises at least one of polyoxyethylene ether surfactant or Tween 85; the polyoxyethylene ether surfactant comprises fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether, and the fatty alcohol polyoxyethylene ether comprises at least one of isomeric tridecanol polyoxyethylene ether, C9-11 alcohol polyoxyethylene ether, isomeric decyl alcohol polyoxyethylene ether, oleyl alcohol polyoxyethylene ether and propylene glycol polyoxyethylene ether;
anionic surfactants include sodium petroleum sulfonate;
the defoaming agent comprises an organic silicon defoaming agent or a polyether defoaming agent;
the bactericide comprises at least one of s-triazine or isothiazolinone
A preparation method of green environment-friendly metal cutting fluid comprises the following steps:
1) heating the reaction kettle to 60-80 ℃, then adding boric acid and triethanolamine to mix according to the mass ratio of 1 (2-2.5), and stirring to react for 30-40min to obtain boric acid triethanolamine ester with an antirust effect;
2) adding monoethanolamine, isopropanolamine and 1,2, 3-benzotriazole in sequence, and stirring for 15-30min to form a composite antirust agent;
3) adding pure water to flush the raw materials on the wall of the reaction kettle into the system, and stirring for 20-40 min;
4) cooling to 30-40 deg.C, adding compound lubricant and auxiliary antirust agent, and stirring for 20-40 min;
3) adding nonionic surfactant, monohydric alcohol and base oil, and stirring for 20-40 min;
4) adding the rest water, anionic surfactant, bactericide and defoaming agent, and stirring until the solution is clear and transparent to obtain the metal cutting fluid.
The following are more detailed embodiments, and the technical solutions and the technical effects obtained by the present invention will be further described by the following embodiments, but the scope of the present invention is not limited to the following embodiments.
As the defoaming agent in the following examples, AFE-1410 type silicone defoaming agent or GP-330 type polyether defoaming agent, which are manufactured by Shandong Yousio chemical technology Co., Ltd, was used.
Example 1:
a preparation method of green environment-friendly metal cutting fluid comprises the following steps:
1) heating the reaction kettle to 70 ℃, sequentially adding a mixture of (5%) boric acid and triethanolamine (the mass ratio of the boric acid to the triethanolamine is 1:2), and stirring for reaction for 30min to obtain boric acid triethanolamine ester;
2) sequentially adding 5 percent of isopropanolamine, 7 percent of monoethanolamine, 4 percent of lauric diacid and 0.2 percent of 1,2, 3-benzotriazole, and stirring for 15min to form a composite antirust agent;
3) adding (10%) pure water to flush the raw materials on the wall of the reaction kettle into the system, and stirring for 30 min;
4) cooling to 35 deg.C, adding composite lubricant composed of (3%) ricinoleic acid, (8%) hexapolyricinoleic acid, and (0.5%) vegetable oil acid, and (3%) antirust dicyclohexylamine, and stirring for 30 min;
5) sequentially adding 6 percent of 1-dodecanol, 5 percent of isomeric tridecanol polyoxyethylene ether serving as a nonionic surfactant and 13 percent of illegal cooking oil to prepare biodiesel, and stirring for 30 min;
6) adding 24% of water, 5% of anionic surfactant petroleum sodium sulfonate, 1.2% of bactericide isothiazolinone and 0.1% of organic silicon defoamer, stirring until the solution is clear and transparent, and then reducing the temperature to room temperature to obtain the metal cutting fluid.
The preparation method of the metal cutting fluid according to the embodiment is simple, energy-saving and environment-friendly, the raw materials are low in price, the prepared metal cutting fluid is good in lubricating property and cooling effect, and the preparation method has the advantages of being economical, fast in heat dissipation, strong in cleaning performance and the like, and is suitable for industrial production.
Example 2:
a preparation method of green environment-friendly metal cutting fluid comprises the following steps:
1) heating the reaction kettle to 70 ℃, sequentially adding a (7%) mixture of boric acid and triethanolamine (the mass ratio of the boric acid to the triethanolamine is 1:2), and stirring for reaction for 30min to obtain boric acid triethanolamine ester;
2) sequentially adding (6%) isopropanolamine, (6%) monoethanolamine, (5%) lauryldicarboxylic acid and (0.1%) 1,2, 3-benzotriazole, and stirring for 15min to form a composite antirust agent;
3) adding (12%) pure water to flush the raw materials on the wall of the reaction kettle into the system, and stirring for 30 min;
4) cooling to 35 deg.C, adding composite lubricant composed of (2%) ricinoleic acid, (8%) hexapolyricinoleic acid, and (0.5%) vegetable oleic acid, and (2%) dicyclohexylamine as auxiliary antirust agent, and stirring for 30 min;
5) sequentially adding 5% of 1-tetradecanol, 3% of isomeric tridecanol polyoxyethylene ether serving as a nonionic surfactant and 12% of illegal cooking oil to prepare biodiesel, and stirring for 30 min;
6) adding 25% of water, 5% of anionic surfactant petroleum sodium sulfonate, 1.2% of bactericide s-triazine and 0.2% of organic silicon defoamer, stirring until the solution is clear and transparent, and then reducing the temperature to room temperature to obtain the metal cutting fluid.
The preparation method of the metal cutting fluid according to the embodiment is simple, energy-saving and environment-friendly, the raw materials are low in price, the prepared metal cutting fluid is good in lubricating property and cooling effect, and the preparation method has the advantages of being economical, fast in heat dissipation, strong in cleaning performance and the like, and is suitable for industrial production.
Example 3:
a preparation method of green environment-friendly metal cutting fluid comprises the following steps:
1) heating the reaction kettle to 70 ℃, sequentially adding a (3.5%) mixture of boric acid and triethanolamine (the mass ratio of the boric acid to the triethanolamine is 1:2), and stirring for reaction for 30min to obtain boric acid triethanolamine ester;
2) sequentially adding 5 percent of isopropanolamine, 10 percent of monoethanolamine, 4 percent of lauric diacid and 0.1 percent of 1,2, 3-benzotriazole, and stirring for 15min to form a composite antirust agent;
3) adding (15%) pure water to flush the raw materials on the wall of the reaction kettle into the system, and stirring for 30 min;
4) cooling to 35 deg.C, adding composite lubricant composed of (2%) ricinoleic acid, (8%) hexapolyricinoleic acid, and (1%) vegetable oleic acid, and (2%) dicyclohexylamine as auxiliary antirust agent, and stirring for 30 min;
5) sequentially adding 5% of 1-tetradecanol, 3% of isomeric dodecyl alcohol polyoxyethylene ether serving as a nonionic surfactant and 12% of illegal cooking oil to prepare biodiesel, and stirring for 30 min;
6) adding 25% of water, 3% of anionic surfactant petroleum sodium sulfonate, 1.2% of bactericide s-triazine and 0.2% of polyether defoamer, stirring until the solution is clear and transparent, and then reducing the temperature to room temperature to obtain the metal cutting fluid.
The preparation method of the metal cutting fluid according to the embodiment is simple, energy-saving and environment-friendly, the raw materials are low in price, the prepared metal cutting fluid is good in lubricating property and cooling effect, and the preparation method has the advantages of being economical, fast in heat dissipation, strong in cleaning performance and the like, and is suitable for industrial production.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The environment-friendly metal cutting fluid is characterized by comprising the following components in percentage by weight:
the balance of water.
2. The environment-friendly metal cutting fluid as defined in claim 1, wherein the base oil comprises at least one of biodiesel prepared from illegal cooking oil, castor oil or soybean oil.
3. The environment-friendly metal cutting fluid as defined in claim 1, wherein the composite antirust agent comprises a mixture of triethanolamine borate, monoethanolamine, isopropanolamine, lauryldicarboxylic acid and 1,2, 3-benzotriazole in a mass ratio of (3-8) to (5-10) to (3-8) to (2-6) to (0.1-0.5);
wherein the boric acid triethanolamine ester is obtained by reacting boric acid and triethanolamine at the mass ratio of 1 (2-2.5) at the temperature of 60-80 ℃ for 30-40 min.
4. The environment-friendly metal cutting fluid as claimed in claim 1, wherein the composite lubricant comprises at least one of ricinoleic acid, hexapolyricinoleic acid or vegetable oil acid.
5. The environment-friendly metal cutting fluid as defined in claim 1, wherein the auxiliary rust inhibitor comprises dicyclohexylamine;
the monohydric alcohol comprises at least one of dodecanol, tridecanol or tetradecanol.
6. The environment-friendly metal cutting fluid according to claim 1, wherein the nonionic surfactant comprises at least one of polyoxyethylene ether surfactant or tween 85.
7. The environment-friendly metal cutting fluid as claimed in claim 6, wherein the polyoxyethylene ether surfactant comprises at least one of fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether;
the fatty alcohol-polyoxyethylene ether comprises at least one of isomeric tridecanol polyoxyethylene ether, C9-11 alcohol polyoxyethylene ether, isomeric decyl alcohol polyoxyethylene ether, oleyl alcohol polyoxyethylene ether and propylene glycol polyoxyethylene ether.
8. The environment-friendly metal cutting fluid as defined in claim 1, wherein the anionic surfactant comprises sodium petroleum sulfonate.
9. The environment-friendly metal cutting fluid as claimed in claim 1, wherein the defoaming agent comprises a silicone defoaming agent or a polyether defoaming agent;
the bactericide comprises at least one of s-triazine or isothiazolinone.
10. A method for preparing the environment-friendly metal cutting fluid as defined in any one of claims 1 to 9, comprising the steps of:
1) mixing the composite antirust agent with part of water at 60-80 ℃ and stirring for 20-40 min;
2) cooling to 30-40 deg.C, adding compound lubricant and auxiliary antirust agent, and stirring for 20-40 min;
3) adding nonionic surfactant, monohydric alcohol and base oil, and stirring for 20-40 min;
4) adding the rest water, anionic surfactant, bactericide and defoaming agent, and stirring until the solution is clear to obtain the metal cutting fluid.
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