Microemulsified metal cutting fluid and method for preparing the same

Abstract

The application discloses a microemulsified metal cutting fluid, relates to the technical field of lubricating compositions, and comprises the following components in parts by weight: base oil 10-30 parts, non-ionic surfactant 10-20 parts, substance A 5-15 parts, water 30-60 parts, and substance A has a crosslinked network structure, wherein the substance A is obtained by crosslinking polymerization of amino borate and unsaturated polyester resin containing a hydroxyl group. The amino borate and the unsaturated polyester resin containing the hydroxyl group are crosslinked and polymerized to obtain the substance A with the crosslinked three-dimensional network structure, and the boundary lubricating capacity of the metal cutting fluid in the aerospace high-temperature alloy machining application can be improved by adding the substance A into the base fluid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating compositions, in particular to a micro-emulsified metal cutting fluid and a preparation method thereof. BACKGROUND

[0002] In the field of aerospace, high-temperature alloys have become key materials for manufacturing key components of aircraft engines and spacecraft due to their excellent high-temperature strength, oxidation resistance, thermal corrosion resistance, and fatigue resistance. However, the difficult-to-machine characteristics of high-temperature alloys, such as high hardness, high strength, and low thermal conductivity, pose extremely stringent requirements on cutting fluids during machining. In metal machining, cutting fluids play important roles in cooling, lubrication, cleaning, and rust prevention.

[0003] Currently, micro-emulsified cutting fluids, as a type of water-based cutting fluid, have been applied in the machining of aerospace high-temperature alloys due to their good cooling performance, low oil mist generation, and relative environmental friendliness. However, water-based metal cutting fluids have weak boundary lubrication ability when applied in the machining of aerospace high-temperature alloys, which leads to increased friction between the tool and the workpiece, accelerated tool wear, and decreased machining surface quality, such as increased surface roughness and scratches, thereby seriously affecting the machining precision and service performance of aerospace components. SUMMARY

[0004] Therefore, the present application provides a micro-emulsified metal cutting fluid to provide a micro-emulsified cutting fluid with excellent performance in boundary lubrication and other aspects, and capable of meeting the performance requirements of aerospace high-temperature alloy machining.

[0005] In a first aspect, the present application provides a micro-emulsified metal cutting fluid, comprising the following components by weight: 10-30 parts of base oil, 10-20 parts of non-ionic surfactant, 5-15 parts of substance A, and 30-60 parts of water. The substance A has a cross-linked network structure, the substance A is a polymer with a cross-linked network structure, and the substance A is obtained by cross-linking polymerization of an amino borate and a hydroxyl-containing unsaturated polyester resin. At least one of the following conditions is satisfied: Condition I: the hydroxyl-containing unsaturated polyester resin is obtained by condensation reaction of maleic anhydride, isophthalic acid, and propylene glycol, and Condition II: the amino borate comprises an alpha-amino borate.

[0006] The present application adds a substance A containing a cross-linked network structure to a base fluid, the cross-linked network structure of the substance A is obtained by cross-linking polymerization of amino borate and hydroxyl-containing unsaturated polyester resin. Specifically, amino borate and hydroxyl-containing unsaturated polyester resin can form a cross-linked three-dimensional network structure through ester exchange or coordination to form B-O-C covalent bond or B-O coordination bond, the coordination bond has dynamic reversibility, which gives the material certain self-repairing ability, and continuously guarantees the lubricating effect.

[0007] The cross-linking polymerization of amino borate and hydroxyl-containing unsaturated polyester resin realizes the enhancement of boundary lubrication ability, that is, even if the three-dimensional cross-linked network is broken under extreme pressure environment, its self-repairing ability can repair the broken part. If not completely repaired, the lubricating performance at the broken part will be weakened, and the overall service life will be shortened. Therefore, self-repairing can maintain a longer protection time, and further guarantee the lubricating effect. At the same time, the cross-linked three-dimensional network structure can reduce the direct contact between the tool and the workpiece, reduce friction and wear, and enhance the boundary lubrication ability by virtue of its special spatial structure, that is, the nodes and chain segments in the network can play a supporting and buffering role, even when the lubricating film is thin. The appropriate cross-linked three-dimensional network structure has a large number of active groups, which can be closely combined with the surface atoms of the high-temperature alloy through physical and chemical adsorption. This strong adsorption makes the lubricant more easily form a continuous and stable lubricating film on the surface of the high-temperature alloy during processing, and it is not easy to be desorbed under high temperature, high pressure and high shear force in the processing process, thereby improving the problem that the lubricating film is difficult to form firmly.

[0008] In some embodiments, the mass of the amino borate is denoted as a, the mass of the hydroxyl-containing unsaturated polyester resin is denoted as b, and 0.3≤a / b≤0.8. Preferably, 0.6≤a / b≤0.8. And / or, the average molecular weight of the hydroxyl-containing unsaturated polyester resin is 2500-3000, the hydroxyl value is 25-30 mgKOH / g, and the primary hydroxyl content is greater than or equal to 70%. The alpha-amino borate at least includes phenylalanine alpha-amino borate, which is an alpha-amino borate compound formed by phenylalanine and borate. In this way, the obtained cross-linked network structure has good mechanical stability and thermal stability, and the network structure is not easily damaged under the harsh working conditions of high-temperature alloy processing.

[0009] In some embodiments, the micro-emulsified metal cutting fluid further includes the following ingredients in the following weight fractions: 1-5 parts of rust inhibitor, 1-5 parts of cleaning agent, and 1-5 parts of defoaming agent. Preferably, the micro-emulsified metal cutting fluid includes the following ingredients in the following weight fractions: 25-30 parts of base oil, 10-15 parts of non-ionic surfactant, 5-10 parts of substance A, 50-60 parts of water, 1-3 parts of rust inhibitor, 1-3 parts of cleaning agent, and 1-3 parts of defoaming agent.

[0010] In some embodiments, the base oil includes at least one of soybean oil, cottonseed oil, palm oil, coconut oil, palm kernel oil, castor oil, olive oil, tea oil, linseed oil, or rapeseed oil.

[0011] In some embodiments, the non-ionic surfactant includes at least one of polyoxyethylene sorbitan monolaurate, polyoxyethylene castor oil, polyoxyethylene stearate, polyoxyethylene glycerol stearate, polyoxyethylene lauric acid polyglyceryl ester, polyoxyethylene sucrose laurate, polyoxyethylene glycerol palmitate, or polyoxyethylene rosin acid ether.

[0012] In a second aspect, the present application provides a preparation method of the microemulsified metal cutting fluid, which includes at least the following steps: mixing base oil, non-ionic surfactant, anti-rust agent, cleaning agent, defoaming agent, and water according to a ratio, heating and stirring to obtain a base solution, cross-linking and polymerizing amino borate and hydroxyl-containing unsaturated polyester resin after drying to obtain substance A, adding substance A to the base solution and treating in a stirring environment of 80-120 r / min for 20-30 min, so that oil molecules are wrapped in the cross-linked network.

[0013] In some embodiments, the temperature of the heating and stirring is 40-60°C, the time is 1-3 h, and the reaction temperature of the cross-linking and polymerization is 100-120°C.

[0014] The present application cross-links and polymerizes amino borate and hydroxyl-containing unsaturated polyester resin to obtain substance A containing a cross-linked three-dimensional network structure, and then fully mixes substance A containing the cross-linked three-dimensional network structure and the base solution, so that oil molecules are wrapped and uniformly dispersed in the cross-linked network. On the one hand, the cross-linked three-dimensional network structure has a large number of active groups, which can be tightly combined with the surface atoms of the high-temperature alloy through physical and chemical adsorption, thereby enhancing the boundary lubrication capacity. On the other hand, it can also improve the uniformity of oil phase dispersion, thereby improving the thermodynamic stability of the microemulsified metal cutting fluid. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0016] Microemulsified metal cutting fluid

[0017] The microemulsified metal cutting fluid comprises the following components by weight: base oil 10-30 parts, non-ionic surfactant 10-20 parts, substance A 5-15 parts, and water 30-60 parts. The substance A has a cross-linked network structure, and the substance A is obtained by cross-linking polymerization of an amino borate and a hydroxyl-containing unsaturated polyester resin. At least one of the following conditions is satisfied: Condition I: the hydroxyl-containing unsaturated polyester resin is obtained by polycondensation reaction of maleic anhydride, isophthalic acid, and propylene glycol; Condition II: the amino borate comprises an alpha-amino borate. The alpha-amino borate at least comprises phenylalanine alpha-amino borate, which is an alpha-amino borate compound formed by phenylalanine and borate.

[0018] The microemulsified metal cutting fluid further comprises the following components by weight: rust inhibitor 1-5 parts, cleaning agent 1-5 parts, and defoaming agent 1-5 parts.

[0019] The mass of the amino borate is denoted as a, and the mass of the hydroxyl-containing unsaturated polyester resin is denoted as b, and 0.3≤a / b≤0.8. a / b is 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or within a range composed of any two of the above values.

[0020] The average molecular weight of the hydroxyl-containing unsaturated polyester resin is 2500-3000, and the hydroxyl value is 25-30 mgKOH / g, wherein the primary hydroxyl content is greater than or equal to 70%. The average molecular weight is 2500, 2600, 2700, 2800, 2900, 3000, or within a range composed of any two of the above values. The hydroxyl value is 25 mgKOH / g, 26 mgKOH / g, 27 mgKOH / g, 28 mgKOH / g, 29 mgKOH / g, 30 mgKOH / g, or within a range composed of any two of the above values.

[0021] The microemulsified metal cutting fluid comprises the following components by weight: base oil 25-30 parts, non-ionic surfactant 10-15 parts, substance A 5-10 parts, water 50-60 parts, rust inhibitor 1-3 parts, cleaning agent 1-3 parts, and defoaming agent 1-3 parts.

[0022] The base oil comprises at least one of soybean oil, cottonseed oil, palm oil, coconut oil, palm kernel oil, castor oil, olive oil, tea oil, flaxseed oil, or rapeseed oil; and / or,

[0023] The non-ionic surfactant comprises at least one of polyoxyethylene sorbitan monolaurate, polyoxyethylene castor oil, polyoxyethylene stearate, polyoxyethylene glycerol stearate, polyoxyethylene lauric acid polyglycerol ester, polyoxyethylene sucrose laurate, polyoxyethylene glycerol palmitate, or polyoxyethylene rosin acid ether.

[0024] Preparation method

[0025] According to the proportion, the base oil, non-ionic surfactant, rust inhibitor, cleaning agent, defoaming agent and water are mixed, heated and stirred at 40-60℃ for 1-3h to obtain a base solution;

[0026] The amino borate and the hydroxyl-containing unsaturated polyester resin are placed in an environment of 100-120℃ for crosslinking polymerization reaction, and the reaction time is 1-2h to obtain substance A;

[0027] Substance A is added to the base solution and stirred at 80-120r / min for 20-30min.

[0028] The preparation of the micro-emulsified metal cutting fluid will be described below in conjunction with specific examples, and those skilled in the art will understand that the preparation method described in the present application is only an example, and any other suitable preparation method is within the scope of the present application.

[0029] Example 1

[0030] A micro-emulsified metal cutting fluid, the weight parts of the raw materials are: base oil 25g, non-ionic surfactant 15g, substance A 10g, water 50g, rust inhibitor 1g, cleaning agent 1g, defoaming agent 1g.

[0031] The base oil is soybean oil;

[0032] The non-ionic surfactant is polyoxyethylene glycerol stearate;

[0033] The rust inhibitor is monoethanolamine borate;

[0034] The cleaning agent is triethanolamine oleate;

[0035] The defoaming agent is a polyether type defoaming agent;

[0036] The amino borate is phenylalanine alpha-amino borate;

[0037] The average molecular weight of the hydroxyl-containing unsaturated polyester resin is 2500, the hydroxyl value is 28mgKOH / g, the primary hydroxyl content is 70%, and a / b is 0.6.

[0038] The mass of substance A=(the mass of amino borate+the mass of hydroxyl-containing unsaturated polyester resin). That is, if a+b=10, the mass of phenylalanine alpha-amino borate is a=0.6x6.25=3.75g, and the mass of hydroxyl-containing unsaturated polyester resin is b=10-3.75=6.25g. The calculation of the following examples is similar and will not be repeated.

[0039] Preparation method:

[0040] (1) According to the proportion of parts, 25 g of soybean oil, 15 g of polyoxyethylene glycerol stearate, 1 g of boric acid monoethanolamine, 1 g of triethanolamine oleate, 1 g of polyether defoamer and water are mixed, heated and stirred, the heating temperature is 40℃, the time is 1h, and the base liquid is obtained;

[0041] (2) According to the mass ratio, 3.75 g of dried phenylalanine alpha-amino borate and 6.25 g of hydroxyl-containing unsaturated polyester resin are placed in an environment with a reaction temperature of 105℃, and stirred for 1.5h to obtain substance A;

[0042] (3) Substance A is added to the base liquid and stirred at 110r / min for 30min to obtain the microemulsion metal cutting fluid.

[0043] Among them, the preparation sequence of steps (1) and (2) is not sequential.

[0044] Test method

[0045] I. Boundary lubrication ability test

[0046] Four-ball tester test (MQ-800 series four-ball friction tester)

[0047] Test conditions: rotation speed 1200r / min, load 392N, test time 30min, temperature 75℃. Pour the microemulsion cutting fluid into the sample cup and immerse the steel ball.

[0048] Test process: start the equipment, record the change of friction torque, after the test, use 50 times microscope to measure the steel ball wear scar diameter, measure 3 different positions of each steel ball and take the average value.

[0049] Test results: the average value of four-ball wear scar diameter N is ≤0.1mm, N is 0.06mm to 0.08mm.

[0050] II. Stability test

[0051] Centrifugal stability test

[0052] Test method: the microemulsion cutting fluid is loaded into a centrifugal tube, centrifuged at 3000r / min for 15min, and whether there is precipitation or stratification after centrifugation is observed.

[0053] Measurement index: the mass of the precipitate after centrifugation is measured by weighing method, and the precipitation rate = precipitate mass / sample initial mass x 100%.

[0054] Test results: the precipitation rate is ≤1%.

[0055] Example 2

[0056] A microemulsified metal cutting fluid, the weight parts of raw materials are: base oil 30g, non-ionic surfactant 10g, substance A 5g, water 60g, rust inhibitor 3g, cleaning agent 3g, defoaming agent 3g.

[0057] The base oil is soybean oil;

[0058] The non-ionic surfactant is polyoxyethylene glycerin stearate;

[0059] The rust inhibitor is monoethanolamine borate;

[0060] The cleaning agent is triethanolamine oleate;

[0061] The defoaming agent is polyether type defoaming agent;

[0062] The amino borate is phenylalanine alpha-amino borate;

[0063] The average molecular weight of the hydroxyl-containing unsaturated polyester resin is 2500, the hydroxyl value is 28mgKOH / g, the primary hydroxyl content is 70%, and a / b is 0.8.

[0064] The preparation method is the same as that in Example 1, and the test result is: the average four-ball wear scar diameter N is less than or equal to 0.1mm, N is 0.06mm to 0.08mm, and the sedimentation rate is less than or equal to 2%.

[0065] Example 3

[0066] A microemulsified metal cutting fluid, the weight parts of raw materials are: base oil 10g, non-ionic surfactant 20g, substance A 15g, water 30g, rust inhibitor 1g, cleaning agent 1g, defoaming agent 1g.

[0067] The base oil is soybean oil;

[0068] The non-ionic surfactant is polyoxyethylene glycerin stearate;

[0069] The rust inhibitor is monoethanolamine borate;

[0070] The cleaning agent is triethanolamine oleate;

[0071] The defoaming agent is polyether type defoaming agent;

[0072] The amino borate is phenylalanine alpha-amino borate;

[0073] The average molecular weight of the hydroxyl-containing unsaturated polyester resin is 2500, the hydroxyl value is 28mgKOH / g, the primary hydroxyl content is 70%, and a / b is 0.6.

[0074] The preparation method is the same as that in Example 1, and the test result is: the average four-ball wear scar diameter N is less than or equal to 0.3mm, N is 0.26mm to 0.28mm, and the sedimentation rate is less than or equal to 3%.

[0075] Example 4

[0076] A microemulsified metal cutting fluid, the raw materials of which are as follows: base oil 25 g, nonionic surfactant 15 g, substance A 10 g, water 50 g, rust inhibitor 1 g, cleaning agent 1 g, and defoaming agent 1 g.

[0077] The base oil is tea oil;

[0078] The nonionic surfactant is polyoxyethylene stearate;

[0079] The rust inhibitor is monoethanolamine borate;

[0080] The cleaning agent is triethanolamine oleate;

[0081] The defoaming agent is a polyether type defoaming agent;

[0082] The amino borate is phenylalanine alpha-amino borate;

[0083] The unsaturated polyester resin containing hydroxyl groups has an average molecular weight of 3000, a hydroxyl value of 25 mgKOH / g, wherein the primary hydroxyl group content is 75%, and a / b is 0.6.

[0084] The preparation method is the same as that in Example 1, and the test results are as follows: the average four-ball wear scar diameter N is ≤0.1 mm, N is 0.08 mm to 0.1 mm, and the sedimentation rate is ≤3%.

[0085] Example 5

[0086] A microemulsified metal cutting fluid, the raw materials of which are as follows: base oil 25 g, nonionic surfactant 15 g, substance A 10 g, water 50 g, rust inhibitor 1 g, cleaning agent 1 g, and defoaming agent 1 g.

[0087] The base oil is soybean oil;

[0088] The nonionic surfactant is polyoxyethylene glycerol stearate;

[0089] The rust inhibitor is monoethanolamine borate;

[0090] The cleaning agent is triethanolamine oleate;

[0091] The defoaming agent is a polyether type defoaming agent;

[0092] The amino borate is phenylalanine alpha-amino borate;

[0093] The unsaturated polyester resin containing hydroxyl groups has an average molecular weight of 2500, a hydroxyl value of 35 mgKOH / g, wherein the primary hydroxyl group content is 70%, and a / b is 0.6.

[0094] The preparation method is the same as that in Example 1, and the test result is: the average four-ball wear scar diameter N is less than or equal to 0.3 mm, N is 0.28 mm to 0.3 mm, and the sedimentation rate is less than or equal to 8%. The inventors speculate that the possible reason is that when the hydroxyl value of the unsaturated polyester resin containing a hydroxyl group is greater than 30 mgKOH / g, the crosslinking density is too high, which reduces the degree of freedom of the molecular chain, and a rigid network structure is formed. The rigid network structure is easy to break, so the sedimentation rate is significantly improved.

[0095] Example 6

[0096] A micro-emulsified metal cutting fluid, the weight parts of raw materials are: base oil 25 g, non-ionic surfactant 15 g, substance A 10 g, water 50 g, rust inhibitor 1 g, cleaning agent 1 g, and defoaming agent 1 g.

[0097] The base oil is soybean oil;

[0098] The non-ionic surfactant is polyoxyethylene glycerol stearate;

[0099] The rust inhibitor is monoethanolamine boric acid;

[0100] The cleaning agent is triethanolamine oleate;

[0101] The defoaming agent is a polyether type defoaming agent;

[0102] The amino borate is phenylalanine alpha-amino borate;

[0103] The average molecular weight of the unsaturated polyester resin containing a hydroxyl group is 1500, the hydroxyl value is 25 mgKOH / g, the content of primary hydroxyl groups is 75%, and a / b is 0.6.

[0104] The preparation method is the same as that in Example 1, and the test result is: the average four-ball wear scar diameter N is less than or equal to 0.3 mm, N is 0.28 mm to 0.3 mm, and the sedimentation rate is less than or equal to 8%. The inventors speculate that the possible reason is that when the average molecular weight of the unsaturated polyester resin containing a hydroxyl group is less than 2500, the low molecular weight polyester molecular chain is short, the spacing between the hydroxyl functional groups is small, and the crosslinking with the amino borate is easy to form a short chain or a high-branched fragmented network, rather than a continuous macromolecular network, so the sedimentation rate is significantly improved.

[0105] Example 7

[0106] A micro-emulsified metal cutting fluid, the weight parts of raw materials are: base oil 25 g, non-ionic surfactant 15 g, substance A 10 g, water 50 g, rust inhibitor 1 g, cleaning agent 1 g, and defoaming agent 1 g.

[0107] The base oil is soybean oil;

[0108] The non-ionic surfactant is polyoxyethylene glycerol stearate;

[0109] The rust inhibitor is monoethanolamine borate;

[0110] The cleaning agent is triethanolamine oleate;

[0111] The defoaming agent is a polyether type defoaming agent;

[0112] The amino borate is phenylalanine alpha-amino borate;

[0113] The hydroxyl-containing unsaturated polyester resin has an average molecular weight of 2500, a hydroxyl value of 25 mgKOH / g, wherein the primary hydroxyl content is 65%, and a / b is 0.6.

[0114] The preparation method is the same as that in Example 1, and the test result is that the average four-ball wear scar diameter N is ≤0.3 mm, N is 0.28 mm to 0.3 mm, and the sedimentation rate is ≤8%. The inventors speculate that the possible reason is that when the primary hydroxyl content of the hydroxyl-containing unsaturated polyester resin is less than 70%, the crosslinking degree is insufficient, a loose and porous network structure is formed, and the network structure is easy to be damaged under the action of shear force or water penetration, so the sedimentation rate is significantly improved.

[0115] Example 8

[0116] A microemulsified metal cutting fluid, the weight parts of raw materials are as follows: base oil 30 g, nonionic surfactant 10 g, substance A 5 g, water 60 g, rust inhibitor 3 g, cleaning agent 3 g, and defoaming agent 3 g.

[0117] The base oil is soybean oil;

[0118] The nonionic surfactant is polyoxyethylene glycerol stearate;

[0119] The rust inhibitor is monoethanolamine borate;

[0120] The cleaning agent is triethanolamine oleate;

[0121] The defoaming agent is a polyether type defoaming agent;

[0122] The amino borate is phenylalanine alpha-amino borate;

[0123] The hydroxyl-containing unsaturated polyester resin has an average molecular weight of 2500, a hydroxyl value of 28 mgKOH / g, wherein the primary hydroxyl content is 70%, and a / b is 0.4.

[0124] The preparation method is the same as that in Example 1, and the test result is that the average four-ball wear scar diameter N is ≤0.2 mm, N is 0.18 mm to 0.2 mm, and the sedimentation rate is ≤2%.

[0125] Example 9

[0126] A microemulsified metal cutting fluid, the weight parts of raw materials are: base oil 30g, non-ionic surfactant 10g, substance A 5g, water 60g, rust inhibitor 3g, cleaning agent 3g, defoaming agent 3g.

[0127] The base oil is soybean oil;

[0128] The non-ionic surfactant is polyoxyethylene glycerin stearate;

[0129] The rust inhibitor is monoethanolamine boric acid;

[0130] The cleaning agent is triethanolamine oleate;

[0131] The defoaming agent is polyether type defoaming agent.

[0132] The amino borate is phenylalanine alpha-amino borate;

[0133] The unsaturated polyester resin containing hydroxyl has an average molecular weight of 2500, a hydroxyl value of 28mgKOH / g, wherein the content of primary hydroxyl is 70%, and a / b is 0.25.

[0134] The preparation method is the same as that in Example 1, and the test result is: the average four-ball wear scar diameter N is ≤0.6mm, N is 0.56mm to 0.58mm, and the sedimentation rate is ≤5%.

[0135] Comparative Example 1

[0136] A microemulsified metal cutting fluid, the weight parts of raw materials are: base oil 25g, non-ionic surfactant 15g, phenylalanine alpha-amino borate 10g, water 50g, rust inhibitor 1g, cleaning agent 1g, defoaming agent 1g.

[0137] The base oil is soybean oil;

[0138] The non-ionic surfactant is polyoxyethylene glycerin stearate;

[0139] The rust inhibitor is monoethanolamine boric acid;

[0140] The cleaning agent is triethanolamine oleate;

[0141] The defoaming agent is polyether type defoaming agent.

[0142] Preparation method:

[0143] According to the part ratio, soybean oil, polyoxyethylene glycerin stearate, monoethanolamine boric acid, triethanolamine oleate, polyether type defoaming agent and water are mixed, heated and stirred, the heating temperature is 40℃, the time is 1h, the base liquid is obtained, phenylalanine alpha-amino borate is added to the base liquid and stirred at 110r / min for 30min. The test result is: the average four-ball wear scar diameter N is >0.6mm, and the sedimentation rate is >8%.

[0144] Comparative Example 2

[0145] A microemulsified metal cutting fluid, the weight parts of raw materials are: base oil 25g, non-ionic surfactant 15g, unsaturated polyester resin containing hydroxyl group 10g, water 50g, rust inhibitor 1g, cleaning agent 1g, defoaming agent 1g.

[0146] The base oil is soybean oil;

[0147] The non-ionic surfactant is polyoxyethylene glycerol stearate;

[0148] The rust inhibitor is monoethanolamine boric acid;

[0149] The cleaning agent is triethanolamine oleate;

[0150] The defoaming agent is a polyether type defoaming agent;

[0151] The average molecular weight of the unsaturated polyester resin containing hydroxyl group is 2500, and the hydroxyl value is 28mgKOH / g, wherein the primary hydroxyl group content is 70%.

[0152] Preparation method:

[0153] According to the part ratio, soybean oil, polyoxyethylene glycerol stearate, monoethanolamine boric acid, triethanolamine oleate, polyether type defoaming agent and water are mixed, heated and stirred, the heating temperature is 40℃, the time is 1h, the base liquid is obtained, the unsaturated polyester resin containing hydroxyl group is added to the base liquid and stirred at 110r / min for 30min. Test results: four ball wear scar diameter average >0.6mm, sedimentation rate >8%.

[0154] Comparative Example 3

[0155] A microemulsified metal cutting fluid, the weight parts of raw materials are: base oil 25g, non-ionic surfactant 15g, substance A 10g, water 50g, rust inhibitor 1g, cleaning agent 1g, defoaming agent 1g.

[0156] The base oil is soybean oil;

[0157] The non-ionic surfactant is polyoxyethylene glycerol stearate;

[0158] The rust inhibitor is monoethanolamine boric acid;

[0159] The cleaning agent is triethanolamine oleate;

[0160] The defoaming agent is a polyether type defoaming agent;

[0161] The amino borate is phenylalanine alpha-amino borate;

[0162] The unsaturated polyester resin containing hydroxyl group has an average molecular weight of 2500, a hydroxyl value of 28 mgKOH / g, wherein the content of primary hydroxyl group is 70%, and a / b is 0.6.

[0163] Preparation method:

[0164] (1) According to the proportion of parts, soybean oil, polyoxyethylene glycerol stearate, boric acid monoethanolamine, oleic acid triethanolamine, polyether defoamer and water are mixed, heated and stirred, the heating temperature is 40℃, the time is 1h, and the base liquid is obtained;

[0165] (2) According to the mass ratio, the dried amino borate and the unsaturated polyester resin containing hydroxyl group are placed at 45℃ and stirred for 1.5h;

[0166] (3) The product of step (2) is added to the base liquid and stirred at 110r / min for 30min. Test results: the average value of four ball wear scar diameter is >0.6mm, and the sedimentation rate is >8%.

[0167] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A microemulsified metal cutting fluid, characterized in that: The composition comprises the following components in parts by weight: 10 to 30 parts of base oil, 10 to 20 parts of nonionic surfactant, 5 to 15 parts of substance A, and 30 to 60 parts of water; The substance A has a cross-linked network structure, and the substance A is obtained by cross-linking polymerization of amino borate and hydroxyl-containing unsaturated polyester resin; And at least one of the following conditions is met: Condition I: The hydroxyl-containing unsaturated polyester resin is obtained by polycondensation of maleic anhydride, isophthalic acid and propylene glycol; Condition II: the aminoboronic acid ester comprises an α-aminoboronic acid ester; The hydroxyl-containing unsaturated polyester resin has an average molecular weight of 2500-3000 and a hydroxyl value of 25-30 mgKOH / g, wherein the primary hydroxyl content is greater than or equal to 70%.

2. The microemulsified metal cutting fluid according to claim 1, characterized in that The mass of the amino borate ester is denoted as a, and the mass of the hydroxyl-containing unsaturated polyester resin is denoted as b, satisfying the following: 0.3≤a / b≤0.

8.

3. The microemulsified metal cutting fluid according to claim 2, characterized in that 0.6≤a / b≤0.

8.

4. The microemulsified metal cutting fluid according to claim 1 or 2, characterized in that: The α-amino borate ester includes at least phenylalanine α-amino borate; The phenylalanine α-amino borate is an α-amino borate compound formed by phenylalanine and borate.

5. The microemulsified metal cutting fluid according to claim 1, characterized in that The following weight fractions are also included: 1 to 5 parts of rust inhibitor, 1 to 5 parts of cleaning agent, and 1 to 5 parts of defoaming agent.

6. The microemulsified metal cutting fluid according to claim 5, characterized in that The following ingredients are included in weight fractions: 25 to 30 parts of base oil, 10 to 15 parts of nonionic surfactant, 5 to 10 parts of substance A, 50 to 60 parts of water, 1 to 3 parts of rust inhibitor, 1 to 3 parts of cleaning agent, and 1 to 3 parts of defoaming agent.

7. The microemulsified metal cutting fluid according to claim 1, characterized in that The base oil comprises at least one of soybean oil, cottonseed oil, palm oil, coconut oil, palm kernel oil, castor oil, olive oil, tea oil, linseed oil or rapeseed oil; and / or, The nonionic surfactant includes at least one of polyoxyethylene sorbitan monolaurate, polyoxyethylene castor oil, polyoxyethylene stearate ether, polyoxyethylene stearate glyceryl, polyoxyethylene laurate polyglyceryl, polyoxyethylene sucrose laurate, polyoxyethylene palmitate glyceryl or polyoxyethylene rosin acid ether.

8. The method for preparing a microemulsified metal cutting fluid according to any one of claims 1 to 7, wherein: The preparation method at least comprises: According to the proportion, base oil, nonionic surfactant, rust inhibitor, cleaning agent, defoaming agent and water are mixed, heated and stirred to obtain a base liquid; Cross-linking and polymerizing an amino borate ester and a hydroxyl-containing unsaturated polyester resin to obtain substance A; Add the substance A to the base liquid and stir at 80-120 r / min for 20-30 min to obtain the product; The cross-linking polymerization reaction temperature is 100 to 120° C., and the time is 1 to 2 hours.

9. The preparation method according to claim 8, characterized in that The heating and stirring is performed at a temperature of 40 to 60° C. and for a time of 1 to 3 hours.