A semi-synthetic cutting fluid and a method for preparing the same

Abstract

The application provides a kind of semi-synthetic cutting fluid, by weight parts, it includes the following components: long-chain dibasic acid ester 10-30 parts, amino acid long-chain alcohol ester 5-15 parts, long-chain dibasic acid 4-10 parts, triethanolamine 5-15 parts, surfactant 5-20 parts, bactericide 0-2 parts, and water, the amount of water added makes the total sum of the above components in aqueous solution is 2-90wt%.The long-chain dibasic acid ester used in the application interacts with amino acid long-chain ester, which can effectively improve the extreme pressure performance of cutting fluid, and the formed emulsion droplets are better dispersed in the system.The amino acid long-chain alcohol ester and the long-chain dibasic acid component of the rust inhibitor together can improve the stability and lubricating ability of the cutting fluid at the same time, greatly improving the use range of the cutting fluid, and can be widely used in various metal processing scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cutting fluid, in particular to a semi-synthetic cutting fluid and a preparation method thereof. BACKGROUND

[0002] Water-based cutting fluid can be divided into three types of emulsified type, semi-synthetic type and full synthetic type, wherein the emulsified cutting fluid has good lubricity and good antirust property but poor stability, is easily eroded and deteriorated by bacteria and has low cooling efficiency; the full synthetic cutting fluid has good cooling and cleaning effect and good work visibility but poor lubricity and antirust property. The semi-synthetic cutting fluid has the advantages of the emulsified cutting fluid and the full synthetic cutting fluid, has good lubricity and cleaning property, long service life, clear and transparent appearance, and is easy to observe the cutting state between the tool and the workpiece during cutting, and has wide application in metal processing.

[0003] Generally, the semi-synthetic cutting fluid uses mineral oil as the base oil, however, the mineral oil is prone to deterioration and has poor safety and environmental protection, and the use in the future will be strictly limited. Therefore, it is necessary to develop a new base oil to replace the mineral oil used in the cutting fluid. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a semi-synthetic cutting fluid and a preparation method thereof, wherein amino acid long-chain alcohol ester is obtained by reacting amino acid and long-chain alcohol, and then combined with long-chain dibasic acid and triethanolamine to obtain semi-synthetic cutting fluid using long-chain dibasic acid ester as the base oil, which has good lubricity and antirust property and is more safe and environmentally friendly.

[0005] The technical purpose of the present application is achieved by the following technical scheme:

[0006] The first aspect of the present application is to provide a semi-synthetic cutting fluid, which comprises the following components by weight fraction:

[0007]

[0008]

[0009] and water,

[0010] The amount of water added is such that the total mass percentage of the above components in the aqueous solution is 2-90wt%;

[0011] The long-chain dibasic acid ester is an alcohol ester compound formed by the reaction of long-chain dibasic acid and long-chain monohydric alcohol; and the amino acid long-chain alcohol ester is an alcohol ester compound formed by the reaction of amino acid and long-chain alcohol.

[0012] Further, the cutting fluid is generally concentrated cutting fluid in production, with high concentration, and the use concentration is generally 2-20wt%.

[0013] Further, the amino acid long-chain alcohol ester is an alcohol ester compound formed by the reaction of an amino acid and a long-chain alcohol, wherein the long-chain alcohol is a C10-C14 n-alkanol alcohol, and is at least one selected from n-decanol, n-undecanol, n-dodecanol, n-tridecanol and n-tetradecanol, preferably n-undecanol and / or n-dodecanol. The amino acid is at least one selected from serine, aspartic acid, glutamic acid and threonine, preferably aspartic acid.

[0014] Further, the amino acid long-chain alcohol ester is prepared by the following method: passing anhydrous HCl into a mixed solution of the amino acid and the long-chain alcohol, heating and refluxing, cooling and filtering to obtain the amino acid long-chain alcohol ester hydrochloride; dissolving the amino acid long-chain alcohol ester hydrochloride in chloroform, adding solid sodium hydroxide and stirring, then filtering to remove excess sodium hydroxide, and rotary evaporation of the solution to obtain the amino acid long-chain alcohol ester. The heating and refluxing temperature is 60-90℃; and the reaction temperature is maintained at 20-40℃ after adding the solid sodium hydroxide.

[0015] Further, the long-chain dibasic acid ester is an alcohol ester compound formed by esterification of a long-chain dibasic acid and a long-chain monohydric alcohol, wherein the long-chain dibasic acid is at least one selected from undecanedioic acid, dodecanedioic acid, tridecanedioic acid and tetradecanedioic acid, and the long-chain monohydric alcohol is a C7-C10 monohydric alcohol, preferably at least one selected from n-heptanol, n-octanol, iso-octanol and iso-nonyl alcohol.

[0016] Further, the long-chain dibasic acid ester is prepared by the following method:

[0017] The long-chain dibasic acid, the long-chain monohydric alcohol and the catalyst are mixed, the temperature is raised for reaction, the acid value is determined, and the reaction is stopped when the required acid value is reached to obtain the long-chain dibasic acid ester.

[0018] Further, the reaction is carried out in a container equipped with a thermometer, a condenser, a stirrer and a water separator, and uniform stirring is carried out during the reaction. Water produced in the reaction is separated by the water separator, and when the amount of water reaches the theoretical amount, a sample is taken for determination of the acid value, and then the reaction is terminated. After the reaction is completed, the temperature is lowered, activated carbon is added for adsorption and filtration, the filtrate is washed with sodium hydroxide solution until neutral, and after standing and separating the layers, the water layer is removed, and then unreacted alcohol is removed by distillation under reduced pressure to obtain the long-chain dibasic acid ester.

[0019] Further, the molar ratio of the long-chain diacid to the long-chain monohydric alcohol is 1:2-1:3, preferably 1:2.6-1:2.8; the reaction temperature is 220-240℃, and the catalyst is a supported heteropolyacid catalyst, specifically a catalyst of phosphotungstic acid supported on silica or molecular sieve, prepared by an impregnation method, which is well known to those skilled in the art, and the mass percentage of the catalyst in the reaction system is 0.8%-1.2%.

[0020] Further, the long-chain diacid as one of the components of the semi-synthetic cutting fluid is a C10-C14 diacid, and as a preferred embodiment, is at least one of undecanedioic acid and dodecanedioic acid.

[0021] Further, the surfactant is selected from at least one of sodium petroleum sulfonate, isomeric tridecanol polyoxyethylene ether and Span 80.

[0022] Further, the bactericide is a hexahydrotriazine or a benzisothiazolinone compound, and as a more specific embodiment, is selected from at least one of 1,2-benzisothiazolin-3-one, 2-butyl-1,2-benzisothiazolin-3-one and hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine.

[0023] The technical objective of the second aspect of the present application is to provide a preparation method of a semi-synthetic cutting fluid, comprising the following steps:

[0024] Anhydrous HCl is introduced into the mixed solution of the amino acid and the long-chain alcohol, heated to reflux, cooled and filtered to obtain the amino acid long-chain alcohol ester hydrochloride; the amino acid long-chain alcohol ester hydrochloride is dissolved in chloroform, solid sodium hydroxide is added and stirred, and then the excess sodium hydroxide is removed by filtration, and the solution is rotary evaporated to obtain the amino acid long-chain alcohol ester.

[0025] The long-chain diacid, the long-chain monohydric alcohol and the catalyst are mixed, heated to react, the acid value is determined, and the reaction is ended when the required acid value is reached to obtain the long-chain diacid ester;

[0026] The long-chain diacid, triethanolamine, the bactericide and water are added into a reactor, stirred, and after complete dissolution, the amino acid long-chain alcohol ester, the long-chain diacid ester and the surfactant are sequentially added, and the semi-synthetic cutting fluid is obtained after stirring until the system is homogeneous and transparent.

[0027] Further, the selection of the long-chain diacid, the amino acid and the long-chain alcohol and the more detailed reaction conditions are the same as those of the first aspect of the present application, and are not repeated.

[0028] The technical objective of the third aspect of the present application is to provide the use of the above-mentioned semi-synthetic cutting fluid, and the cutting fluid is used in a metal processing process.

[0029] Further, when the cutting fluid is concentrated, the cutting fluid is diluted with water before use, and the total mass concentration of long-chain dibasic acid ester, amino acid long-chain alcohol ester, long-chain dibasic acid, triethanolamine, surfactant and bactericide is 0.5-8wt%, preferably 2-5wt%.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] (1) The long-chain dibasic acid ester has high lubricating ability, oxidation stability and biodegradability, which replaces mineral oil as the base oil of the cutting fluid, thereby reducing the adverse effects of the cutting fluid on the environment. The long-chain dibasic acid ester interacts with the amino acid long-chain ester to effectively improve the extreme pressure performance of the cutting fluid, and the formed emulsion droplets are better dispersed in the system.

[0032] (2) The amino acid long-chain alcohol ester has high extreme pressure performance and certain amphiphilicity, which can improve the stability and lubricating ability of the cutting fluid together with the long-chain dibasic acid component, thereby greatly improving the use range of the cutting fluid and enabling the cutting fluid to be widely applied to various metal processing scenes. DETAILED DESCRIPTION

[0033] The following non-limiting examples can enable those skilled in the art to more fully understand the present application, but do not limit the present application in any way.

[0034] Example 1

[0035] This example discloses a semi-synthetic cutting fluid, the constituent components and the weight percentage of each component are as follows:

[0036] Aspartic acid dodecanol ester: 100g

[0037] Dioctyl undecanedioate: 200g

[0038] Dodecanedioic acid: 60g

[0039] Triethanolamine: 100g

[0040] Sodium petroleum sulfonate: 100g

[0041] Hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine: 10g

[0042] Deionized water: 430g

[0043] The cutting fluid is prepared by the following method:

[0044] (1) 20 g of aspartic acid was dissolved in 500 mL of n-dodecanol, and then excess anhydrous HCl was introduced. After heating and refluxing at 80°C for half an hour, the solution was cooled and filtered to obtain aspartic acid dodecanol ester hydrochloride. 50 g of aspartic acid dodecanol ester hydrochloride was dissolved in chloroform, 15 g of solid sodium hydroxide was added and stirred, and then excess sodium hydroxide was removed by filtration. The solution was rotary evaporated to obtain aspartic acid dodecanol ester.

[0045] (2) In a three-necked flask equipped with a thermometer, a condenser, a stirrer and a water separator, 50 g of undecanedioic acid, 80 g of n-octanol and 1 g of silica-supported phosphotungstic acid catalyst were added and uniformly stirred. The temperature was raised to 220°C. The water produced in the reaction was separated by the water separator. When the amount of water reached the theoretical amount, the acid value was determined by sampling. If the required acid value was reached, the reaction was terminated. After the reaction was completed, the temperature was lowered, activated carbon was added for adsorption and filtration. The filtrate was washed with sodium hydroxide solution until it was neutral. After standing and separating the layers, the water layer was removed. Then, the unreacted alcohol was removed by distillation under reduced pressure to obtain dioctyl undecanedioate.

[0046] (3) The above-mentioned components were added to a reaction kettle in the proportions specified above. After stirring until complete dissolution, aspartic acid dodecanol ester, dioctyl undecanedioate and sodium petroleum sulfonate were added in sequence. After stirring until the system was uniform and transparent, the emulsified cutting fluid was obtained.

[0047] The rust prevention performance of the cutting fluid was tested (test method: JB / T 7453-2013). The prepared cutting fluid was diluted to a 5wt% solution using distilled water for the rust prevention test. The results of the rust prevention test were as follows: single-piece rust prevention time ≥ 24 h, and stacked-piece rust prevention time ≥ 8 h.

[0048] The carrying capacity of the cutting fluid was tested (test method: GB / T 3142-2019). The prepared cutting fluid was diluted to a 10wt% solution using distilled water for the determination of the maximum non-galling load. The determination result was a maximum non-galling load value of 570 N.

[0049] Example 2

[0050] This example discloses a semi-synthetic cutting fluid, the constituent components and the weight percentages of each component are as follows:

[0051] Threonine undecanol ester: 100 g

[0052] Dodecanedioic acid diheptyl ester: 150 g

[0053] Sebacic acid: 50 g

[0054] Triethanolamine: 90 g

[0055] Sorbester 80: 80 g

[0056] 1,2-benzisothiazolin-3-one: 10 g

[0057] Deionized water: 520 g

[0058] The cutting fluid is prepared by the following method:

[0059] (1) 20 g of threonine is dissolved in 500 mL of n-undecanol, and then excess anhydrous HCl is introduced. After heating and refluxing at 80°C for half an hour, it is cooled and filtered to obtain threonine undecanol ester hydrochloride. 50 g of threonine undecanol ester hydrochloride is dissolved in chloroform, 15 g of solid sodium hydroxide is added and stirred, then excess sodium hydroxide is removed by filtration, and the solution is rotary evaporated to obtain threonine undecanol ester.

[0060] (2) In a three-necked flask equipped with a thermometer, a condenser, a stirrer and a water separator, 50 g of dodecanedioic acid, 80 g of n-heptanol and 1 g of silica-supported phosphotungstic acid catalyst are added, stirred uniformly, and heated to 220°C. The water produced in the reaction is separated by the water separator. When the amount of water reaches the theoretical amount, sample and determine the acid value. If the required value is reached, the reaction is terminated. After the reaction is completed, the temperature is lowered, activated carbon is added for adsorption and filtration. The filtrate is washed with sodium hydroxide solution until it is neutral. After standing and separating the layers, the water layer is removed. Then, the unreacted alcohol is removed by distillation under reduced pressure to obtain dodecanedioic acid diheptyl ester.

[0061] (3) The above-mentioned components are added to the reaction kettle in the proportions specified, and stirring is started. After complete dissolution, threonine undecanol ester, dodecanedioic acid diheptyl ester and Suber 80 are added in sequence, and the system is stirred until it is homogeneous and transparent to obtain the emulsified cutting fluid.

[0062] Cutting fluid rust prevention performance test (test method: JB / T 7453-2013). The prepared cutting fluid is diluted to 5wt% (mass fraction of other substances except water, the same below) solution with distilled water for rust prevention test. The rust prevention test result is single piece rust prevention time ≥ 24 h and stacked piece rust prevention time ≥ 8 h.

[0063] Cutting fluid carrying capacity test (test method: GB / T 3142-2019). The prepared cutting fluid is diluted to 10wt% solution with distilled water for determination of maximum non-galling load. The determination result is maximum non-galling load value of 550 N.

[0064] Example 3

[0065] This example discloses a semi-synthetic cutting fluid, the constituent components and the weight percentage of each component are as follows:

[0066] Glutamic acid dodecanol ester: 100 g

[0067] Diisooctyl tridecanoate: 200g

[0068] Tridecanoic acid: 60g

[0069] Triethanolamine: 100g

[0070] Sodium petroleum sulfonate: 85g

[0071] 2-Butyl-1,2-benzisothiazolin-3-one: 5g

[0072] Deionized water: 450g

[0073] Cutting fluid is prepared by the following method:

[0074] (1) Dissolve 20g of glutamic acid in 500mL of n-dodecyl alcohol, then pass in excess anhydrous HCl, heat and reflux at 80℃ for half an hour, then cool and filter to obtain dodecyl glutamic acid hydrochloride; dissolve 50g of dodecyl glutamic acid hydrochloride in chloroform, add 15g of solid sodium hydroxide and stir, then filter to remove excess sodium hydroxide, and rotary evaporate the solution to obtain dodecyl glutamic acid ester.

[0075] (2) Add 50g of tridecanoic acid, 80g of isooctanol, and 1g of silica-supported phosphotungstic acid catalyst to a three-necked flask equipped with a thermometer, condenser, stirrer, and water separator. Stir evenly and heat to 220°C. Separate the water produced in the reaction using a water separator. When the water volume reaches the theoretical amount, take a sample to determine the acid value. If the requirement is met, terminate the reaction. After the reaction is complete, cool down, add activated carbon for adsorption, and filter. Wash the filtrate with sodium hydroxide solution until neutral. After standing and separating the layers, remove the water layer. Then, remove the unreacted alcohol by vacuum distillation to obtain diisooctyl tridecanoic acid.

[0076] (3) According to the above-mentioned proportions, add tridecanoic acid, triethanolamine, 2-butyl-1,2-benzisothiazolin-3-one and deionized water into the reaction vessel, start stirring, and after complete dissolution, add dodecanol glutamate, diisooctyl tridecanoic acid and sodium petroleum sulfonate in sequence, and stir until the system is uniform and transparent to obtain the emulsified cutting fluid.

[0077] The rust prevention performance test of cutting fluid (test method: JB / T 7453-2013) uses distilled water to dilute the prepared cutting fluid to a 5wt% solution (mass fraction of other substances except water, the same below) for rust prevention test. The rust prevention test results are: single-piece rust prevention time ≥24h, stacked-piece rust prevention time ≥8h.

[0078] Cutting fluid carrying capacity test (test method: GB / T 3142-2019), the prepared cutting fluid is diluted to 10wt% solution with distilled water to determine the maximum non-galling load, and the determination result is that the maximum non-galling load value is 520N.

[0079] Comparative example 1

[0080] Aspartic acid: 100g

[0081] Dioctyl undecanedioate: 200g

[0082] Dodecanedioic acid: 60g

[0083] Triethanolamine: 100g

[0084] Sodium petroleum sulfonate: 100g

[0085] Hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine: 10g

[0086] Deionized water: 430g

[0087] Except that aspartic acid is replaced by aspartic acid dodecanol ester, the preparation method of the cutting fluid is the same as that in example 1.

[0088] Cutting fluid rust prevention performance test (test method: JB / T 7453-2013), the prepared cutting fluid is diluted to 5wt% (mass fraction of other substances except water, the same below) solution with distilled water to perform rust prevention test, and the rust prevention test result is that the single piece rust prevention time is ≥24h, and the stacked piece rust prevention time is ≥8h.

[0089] Cutting fluid carrying capacity test (test method: GB / T 3142-2019), the prepared cutting fluid is diluted to 10wt% solution with distilled water to determine the maximum non-galling load, and the determination result is that the maximum non-galling load value is 360N.

[0090] Comparative example 2

[0091] Aspartic acid dodecanol ester: 100g

[0092] Dioctyl undecanedioate: 200g

[0093] Triethanolamine: 100g

[0094] Sodium petroleum sulfonate: 100g

[0095] Hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine: 10g

[0096] Deionized water: 430g

[0097] Except that no dodecanedioic acid is added, the preparation method of the cutting fluid is the same as that in example 1.

[0098] The rust-preventive performance of the cutting fluid was tested (test method: JB / T 7453-2013) by diluting the prepared cutting fluid to a 5wt% solution using distilled water. The rust-preventive test results were a single-piece rust-preventive time of ≥12h and a stacked-piece rust-preventive time of ≥2h.

[0099] The carrying capacity of the cutting fluid was tested (test method: GB / T 3142-2019) by diluting the prepared cutting fluid to a 10wt% solution to determine the maximum non-galling load. The determination results were a maximum non-galling load value of 520N.

[0100] Comparative Example 3

[0101] Aspartic acid dodecanol ester: 100g

[0102] Dodecanedioic acid: 60g

[0103] Triethanolamine: 100g

[0104] Sodium petroleum sulfonate: 100g

[0105] Hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine: 10g

[0106] Deionized water: 430g

[0107] The cutting fluid was prepared according to the method of Example 1 except that dodecanedioic acid dioctyl ester was not added.

[0108] The rust-preventive performance of the cutting fluid was tested (test method: JB / T 7453-2013) by diluting the prepared cutting fluid to a 5wt% solution using distilled water. The rust-preventive test results were a single-piece rust-preventive time of ≥18h and a stacked-piece rust-preventive time of ≥6h.

[0109] The carrying capacity of the cutting fluid was tested (test method: GB / T 3142-2019) by diluting the prepared cutting fluid to a 10wt% solution to determine the maximum non-galling load. The determination results were a maximum non-galling load value of 260N.

Claims

1. A semi-synthetic cutting fluid, characterized in that, It consists of the following components by weight: 10-30 parts of long-chain diester 5-15 parts of amino acid long-chain alcohol esters 4-10 parts of long-chain dicarboxylic acids 5-15 parts of triethanolamine 5-20 parts of surfactant 0-2 parts of bactericide and water, The amount of water added makes the total mass percentage of the above components (excluding water) in the aqueous solution 2-90 wt%; The long-chain dicarboxylic acid ester is an ester compound formed by the esterification reaction of a long-chain dicarboxylic acid and a long-chain monohydric alcohol. The long-chain dicarboxylic acid is selected from at least one of undecanoic acid, dodecanoic acid, tridecanoic acid and tetradecanoic acid. The long-chain monohydric alcohol is a C7-C10 monohydric alcohol. The amino acid long-chain alcohol ester is an alcohol ester compound formed by the reaction of amino acids and long-chain alcohols. The long-chain alcohol is a C10-C14 n-alkane alcohol, and the amino acid is selected from at least one of serine, aspartic acid, glutamic acid, and threonine. The amino acid long-chain alcohol ester is prepared by the following method: anhydrous HCl is passed into a mixed solution of amino acid and long-chain alcohol, heated under reflux, cooled and filtered to obtain amino acid long-chain alcohol ester hydrochloride; the amino acid long-chain alcohol ester hydrochloride is dissolved in chloroform, solid sodium hydroxide is added and stirred, then excess sodium hydroxide is removed by filtration, and the solution is rotary evaporated to obtain the amino acid long-chain alcohol ester.

2. The semi-synthetic cutting fluid according to claim 1, characterized in that, The reflux temperature is 60-90℃; after adding solid sodium hydroxide, the reaction temperature is maintained at 20-40℃.

3. The semi-synthetic cutting fluid according to claim 1, characterized in that, The long-chain diester is prepared by the following method: A long-chain dicarboxylic acid, a long-chain monohydric alcohol, and a catalyst are mixed, the mixture is heated to react, the acid value is measured, and the reaction is stopped when the required value is reached to obtain the long-chain dicarboxylic acid ester.

4. The semi-synthetic cutting fluid according to claim 3, characterized in that, The molar ratio of the long-chain dicarboxylic acid to the long-chain monohydric alcohol is 1:2-1:3, and the reaction temperature is 220-240℃.

5. The semi-synthetic cutting fluid according to claim 3, characterized in that, The catalyst is a supported heteropolyacid catalyst, and its mass percentage in the reaction system is 0.8%-1.2%.

6. The semi-synthetic cutting fluid according to claim 1, characterized in that, The long-chain dicarboxylic acid, which is one of the components of the semi-synthetic cutting fluid, is a C10-C14 dicarboxylic acid.

7. The semi-synthetic cutting fluid according to claim 1, characterized in that, The surfactant is selected from at least one of sodium petroleum sulfonate, isotridecyl alcohol polyoxyethylene ether, and Span 80.

8. The semi-synthetic cutting fluid according to claim 1, characterized in that, The bactericide is selected from at least one of 1,2-benzisothiazolin-3-one, 2-butyl-1,2-benzisothiazolin-3-one, and hexahydro-1,3,5-tris(hydroxyethyl)-triazine.

9. The semi-synthetic cutting fluid according to claim 1, characterized in that, The cutting fluid has a concentration of 2-20 wt% when in use.

10. A method for preparing the semi-synthetic cutting fluid according to any one of claims 1-9, comprising the following steps: Anhydrous HCl was passed into a mixed solution of amino acids and long-chain alcohols, heated to reflux, cooled and filtered to obtain amino acid long-chain alcohol ester hydrochloride; the amino acid long-chain alcohol ester hydrochloride was dissolved in chloroform, solid sodium hydroxide was added and stirred, then excess sodium hydroxide was removed by filtration, and the solution was rotary evaporated to obtain the amino acid long-chain alcohol ester. Long-chain dicarboxylic acid, long-chain monohydric alcohol and catalyst are mixed, heated and reacted, the acid value is measured, and the reaction is stopped after the requirement is met to obtain the long-chain dicarboxylic acid ester. Long-chain dicarboxylic acid, triethanolamine, bactericide and water are added to a reactor and stirred. After complete dissolution, long-chain alcohol esters of amino acids, long-chain dicarboxylic acid esters and surfactants are added in sequence and stirred until the system is homogeneous and transparent to obtain the semi-synthetic cutting fluid.

11. The application of the semi-synthetic cutting fluid according to any one of claims 1-9, characterized in that, The cutting fluid is used in the metalworking process.

12. The application according to claim 11, characterized in that, When the cutting fluid is concentrated, it shall be diluted with water before use until the total mass concentration of long-chain dicarboxylic acid ester, amino acid long-chain alcohol ester, long-chain dicarboxylic acid, triethanolamine, surfactant and bactericide is 0.5-8 wt%.

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