High-temperature-resistant high-lubricity stainless steel cutting oil and preparation method thereof

Abstract

The application relates to the field of lubricating oil, in particular to a high-temperature-resistant high-lubricating stainless steel cutting oil and a preparation method thereof. The cutting oil is composed of base oil, extrusion agent, additive, anti-emulsifier and diluent in specific proportions, wherein the additive comprises polyisobutylene succinic anhydride, amine and propylene oxide polymer, boron-containing compound, basic alkyl salt, imidazoline oleate, antioxidant compound and ethylene-propylene copolymer. By optimizing the proportions of various components and selecting suitable materials, the application can significantly improve the oxidation resistance and cleanliness of the cutting oil, effectively prolong the temperature of the cutting oil in the recycling and reuse process, reduce equipment wear and contamination, and improve the production efficiency of stainless steel.

Description

Technical Field

[0001] This application relates to the field of lubricating oils, and more specifically, to a high-temperature resistant, high-lubricity stainless steel cutting oil and its preparation method. Background Technology

[0002] Cutting oils play four main roles in metalworking: lubrication, cooling, cleaning, and rust prevention. These functions are particularly important in stainless steel machining. Due to its high hardness, high toughness, and tendency to work harden, stainless steel places higher demands on cutting oils. Lubrication reduces tool wear and improves surface finish; cooling prevents overheating and deformation of tools and workpieces; cleaning effectively removes chips; and rust prevention protects machine tools and workpieces.

[0003] In specific applications of stainless steel machining, different processes require tailored cutting oil solutions. Turning and milling require high extreme pressure oil-based cutting oils; drilling and tapping recommend specialized oils containing chlorine extreme pressure additives; grinding is best performed with semi-synthetic cutting fluids that provide strong cooling; sawing processes require emulsions that balance lubrication and cooling; and heavy-duty machining such as broaching requires high-viscosity sulfur-containing cutting oils. These specialized cutting oils effectively address common problems in stainless steel machining, such as tool adhesion and work hardening.

[0004] In the stainless steel manufacturing process, although cutting oil can be recycled, high-temperature operating conditions can lead to significant loss. This loss involves multiple stages, including evaporation, oil mist diffusion, adsorption residue, and chemical reaction consumption. For example, high-temperature evaporation and volatilization are the primary factors causing cutting oil loss. Stainless steel has high hardness and poor thermal conductivity; during cutting, the temperature at the tool-workpiece contact zone can reach 600-800℃, far exceeding the boiling point of the base oil (mineral oil or synthetic oil) in the cutting oil. High temperatures cause low-boiling-point components in the oil (such as light mineral oil fractions) to rapidly vaporize and dissipate into the air as steam. Simultaneously, some organic compounds in additives (such as fatty acid oiliness agents) also volatilize due to insufficient thermal stability, leading to a decrease in oil concentration and performance degradation.

[0005] However, existing cutting oils still have some shortcomings under high-temperature conditions, especially during long-term cyclic use. Cutting oils are prone to oxidation, sedimentation, stratification, discoloration, and deterioration, thus affecting their performance. Simultaneously, the lubricity and cleaning properties of the cutting oil decrease significantly during cyclic use, leaving stains or wear on the cut stainless steel surface, further reducing the oil's durability and the quality of the stainless steel. These problems limit the performance of existing cutting oils in practical applications, necessitating the development of a high-temperature, high-lubricity stainless steel cutting oil that maintains good performance under high-temperature conditions, thereby improving the durability of cutting oils. Summary of the Invention

[0006] In order to obtain better oxidation resistance, lubricity and cleanliness of cutting oil, improve the stability of cutting oil in the cutting process, and reduce the phenomenon of wear and residual stains on stainless steel, this application provides a high-temperature resistant and high-lubricity stainless steel cutting oil and its preparation method.

[0007] In a first aspect, this application provides a high-temperature resistant, high-lubricity stainless steel cutting oil, composed of the following raw materials by weight percentage:

[0008] Base oil 50-60%

[0009] Extreme pressure agent 15-20%

[0010] Additives 15-20%

[0011] Antiemulsifier 1-3%

[0012] The remainder is diluent;

[0013] The additive is composed of the following raw materials in parts by weight:

[0014] 5-15 parts of polyisobutylene succinic anhydride

[0015] 2.5-6.5 parts of amine-propylene oxide polymer.

[0016] 15-23 parts of boron-containing compounds

[0017] 13-17 parts of basic alkyl salt

[0018] Imidazoline oleate 0.5-1.8 parts

[0019] 3-5 parts of antioxidant compounds

[0020] 1.2-3.2 parts of ethylene-propylene copolymer;

[0021] The basic alkyl salt is composed of type A basic alkyl salt and type B basic alkyl salt in a weight ratio of 1:(0.4-1); the type A basic alkyl salt is calcium alkylphenol sulfide and / or calcium alkyl salicylate; the type B basic alkyl salt is long-chain linear alkylbenzene high-base-value synthetic calcium sulfonate; the total base value of the type B basic alkyl salt is greater than the total base value of the type A basic alkyl salt; the antioxidant compound is composed of multiple components including sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl) basic zinc salt.

[0022] By adopting the above technical solution, the basic alkyl salt is composed of type A basic alkyl salt and type B basic alkyl salt in a specific ratio. Type A basic alkyl salt possesses extreme pressure anti-wear properties, detergency, and antioxidant properties, while type B basic alkyl salt possesses high-temperature thermal stability, good detergency and dispersibility, strong acid neutralization ability, and rust prevention. The combination of the two creates a synergistic effect, further improving the cleaning effect of the cutting oil. Simultaneously, the selection of antioxidant compounds (sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl) basic zinc salt) not only provides lubrication and friction reduction, antioxidant and thermal stability, corrosion resistance and rust prevention, and net dispersibility and extreme pressure properties, but also works synergistically with boron-containing compounds and basic alkyl salts to further enhance the overall performance of the cutting oil. This effectively reduces oxidation stratification and discoloration that may occur during the cyclic use of the cutting oil, while preventing wear and stains after cutting stainless steel, improving the quality of stainless steel, ensuring the stability and durability of the cutting oil, avoiding frequent oil changes, and increasing production efficiency.

[0023] Specifically, polyisobutylene succinic anhydride can improve lubrication performance and acts as an emulsifying stabilizer, detergent, corrosion and rust inhibitor, and defoamer. Furthermore, polyisobutylene succinic anhydride works synergistically with amines, propylene oxide polymers, boron-containing compounds, and basic alkyl salts to enhance the overall performance of cutting oils, improve their stability during repeated use in the cutting process, reduce wear and residual stains on stainless steel, and ensure smooth cutting processes and improved product quality.

[0024] In summary, this high-temperature resistant and high-lubricating stainless steel cutting oil, through the synergistic effect of various components including polyisobutylene succinic anhydride, amine and propylene oxide polymer, boron-containing compounds, basic alkyl salts, imidazoline oleate, antioxidants, and ethylene-propylene copolymers, combined with extruders, demulsifiers, and diluents, possesses excellent comprehensive properties such as anti-oxidation, cleaning, and demulsification. This ensures the quality stability of the cutting oil during recycling and reuse, and guarantees the quality of stainless steel and the durability of the cutting oil.

[0025] This application ensures that the cutting oil maintains stable quality during long-term recycling and reuse, preventing premature oxidation and deterioration. Furthermore, the base oil in this application contains a large proportion of environmentally friendly vegetable oils, improving the environmental friendliness of stainless steel cutting oils.

[0026] Preferably, the extreme pressure agent is isobutylene sulfide and / or chlorinated paraffin.

[0027] In cutting fluids, extreme pressure agents such as sulfurized isobutylene and chlorinated paraffin mainly form an anti-wear protective film at the high-pressure and high-temperature interface of metal cutting through chemical reaction, thereby significantly improving the extreme pressure lubrication performance of the cutting fluid.

[0028] Preferably, the boron compound is a nitrogen-containing borate ester and / or a boronized high molecular weight succinimide.

[0029] The addition of nitrogen-containing borate esters and / or borated high molecular weight succinimide significantly improves the extrusion anti-wear properties and oxidation resistance of cutting oils. Nitrogen-containing borate esters also have a certain cleaning effect, reducing sludge and deposits generated during cutting, while borated high molecular weight succinimide, as a dispersant, can be uniformly dispersed in the cutting oil, preventing the aggregation and deposition of impurities and contaminants. Interacting with other raw materials, they collectively enhance the cutting oil's oxidation resistance, lubricity, and cleaning properties under high-temperature environments, ensuring the stability of the cutting oil for recycling during the cutting process, reducing wear and residual stains on stainless steel, and improving the durability of the cutting oil and the quality of stainless steel.

[0030] Preferably, the boron compound is composed of a nitrogen-containing borate ester and a boronized high molecular weight succinimide in a weight ratio of 1:(1-3).

[0031] By adopting the above technical solution, the weight ratio of nitrogen-containing borate ester to boronized high molecular weight succinimide is 1:(1-3), which can further improve the extrusion anti-wear, anti-oxidation, and cleaning effects of cutting oil. Nitrogen-containing borate ester possesses extrusion anti-wear and anti-oxidation properties, while boronized high molecular weight succinimide, as a dispersant, can be uniformly dispersed in the cutting oil, preventing the aggregation and deposition of impurities and contaminants in the oil. The synergistic effect of the two enhances the overall performance of the cutting oil. Furthermore, it ensures the stable quality of the cutting oil after recycling and reuse, as well as the quality of the stainless steel.

[0032] Preferably, the total base value of the type A basic alkyl salt is 150-250 mg KOH / g, and the total base value of the type B basic alkyl salt is 300-400 mg KOH / g.

[0033] By adopting the above technical solutions, the total base value of type A basic alkyl salts is 150-250 mg KOH / g, and the total base value of type B basic alkyl salts is 300-400 mg KOH / g. This gives the cutting oil superior high-temperature thermal stability, detergency and dispersibility, and acid neutralization ability. It further improves the cutting oil's antioxidant properties, extreme pressure anti-wear properties, and rust prevention, thereby extending the service life of the cutting oil during its cycle and preventing stains and wear on the stainless steel after cutting, thus improving cutting efficiency and product quality.

[0034] Preferably, the type A basic alkyl salt is composed of calcium alkylphenol sulfide and / or calcium alkyl salicylate in a weight ratio of 1:(1-5).

[0035] The A-type basic alkyl salt, composed of calcium alkylphenolate sulfide and / or calcium alkyl salicylate in a weight ratio of 1:(1-5), plays a synergistic role in further improving the extreme pressure anti-wear performance, detergency, acid neutralization capacity and antioxidant performance of the cutting oil. This extends the service life of the cutting oil during the cycle and prevents stains and wear on the stainless steel after cutting, thereby improving cutting efficiency and product quality.

[0036] Preferably, the antioxidant compound is composed of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl)basic zinc salt in a weight ratio of 5:(1-3):(2-5).

[0037] A combination of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl) basic zinc salt in a weight ratio of 5:(1-3):(2-5) can effectively improve the antioxidant properties of cutting oil, delay oil aging, and maintain long-term lubrication. Simultaneously, it interacts with other raw materials in this application to further enhance the overall performance of the cutting oil, extend its service life, ensure smooth cutting processes, and improve product quality.

[0038] Preferably, the base oil is composed of one or more of hydrogenated oil, mineral oil, vegetable oil, and polyalphaolefin.

[0039] By adopting the above technical solutions, hydrogenated oil, mineral oil, and vegetable oil polyalphaolefins exhibit superior lubrication and protection properties, effectively reducing friction between the rolls and stainless steel, and improving the smoothness of the cutting process and product quality. Simultaneously, the synergistic effect of these base oils, additives, and other components further enhances the overall performance of the cutting oil, improving its antioxidant, demulsifying, and rust-preventing capabilities, extending its service life, and reducing maintenance costs.

[0040] Among them, the preferred vegetable oils are soybean oil, rapeseed oil, and palm oil;

[0041] The base oil in this application is composed of vegetable oil and polyalphaolefin in a weight ratio of 9:1. This composition not only gives the stainless steel cutting oil better environmental performance, but also achieves better performance by combining polyisobutylene succinic anhydride, amine and propylene oxide polymers, boron-containing compounds, basic alkyl salts, imidazoline oleate, antioxidants, ethylene-propylene copolymers, extruders, etc.

[0042] Preferably, the diluent is one or more of the following: methyl oleate, ethyl palmitate, epoxidized soybean oil, ethyl acetate, n-butyl acetate, n-butanol, ethanol, and cashew nut shell oil.

[0043] By adopting the above technical solution, the selection of the diluent not only improves the lubrication performance, dissolution and dispersion performance, cooling and cleaning effect of the cutting oil, but also effectively adjusts the viscosity of the cutting oil, thereby extending the stability of the cutting oil's cycle use process, ensuring its antioxidant, anti-wear lubrication and cleanliness, and preventing stains and wear on the stainless steel after cutting, thus improving cutting efficiency and product quality.

[0044] The second part describes a method for preparing a high-temperature resistant, high-lubricity stainless steel cutting oil, which includes the following steps:

[0045] According to the weight parts, weigh out polyisobutylene succinic anhydride, amine and propylene oxide polymer, boron-containing compound, basic alkyl salt, imidazoline oleate, antioxidant compound, and ethylene-propylene copolymer, mix them evenly to obtain the additive;

[0046] Weigh out the base oil, additives, and diluent by weight percentage, mix them evenly, and you will get the cutting oil.

[0047] The above preparation method can improve the mixing uniformity of each raw material, thereby effectively enhancing the comprehensive performance of the high-temperature and high-lubricity stainless steel cutting oil. This ensures that it can maintain good lubrication, anti-oxidation and cleaning effects even under long-term high-temperature and high-pressure recycling, thereby improving the quality of stainless steel and cutting efficiency.

[0048] In summary, this application includes at least one of the following beneficial technical effects:

[0049] 1. By compounding polyisobutylene succinic anhydride, amines and propylene oxide polymers, boron-containing compounds, basic alkyl salts, imidazoline oleate, antioxidant compounds, and ethylene-propylene copolymers, an additive with excellent extrusion anti-wear, anti-oxidation, and cleaning properties was obtained, significantly improving the stability and service life of cutting oils in high-temperature recycling environments; 2. The compounding of type A and type B basic alkyl salts utilizes the extreme pressure anti-wear, cleaning, and anti-oxidation properties of calcium alkylphenolate sulfide and / or calcium alkyl salicylate, combined with the high-temperature thermal stability, cleaning and dispersing properties, acid neutralization ability, and rust prevention of long-chain linear alkylbenzene high-alkalinity calcium sulfonate, thereby extending the stability of the cutting oil during recycling, ensuring antioxidant, anti-wear lubrication, and cleanliness, and preventing stains and wear on stainless steel after cutting, thus improving cutting efficiency and product quality;

[0050] 3. The antioxidant compound system, composed of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl) basic zinc salt, not only has good antioxidant properties, but also lubrication and friction reduction, corrosion resistance and rust prevention, net dispersion and extreme pressure properties. It works in conjunction with boron-containing compounds and basic alkyl salts to extend the stability of the cutting oil during its cycle, ensuring antioxidant, anti-wear lubrication and cleanliness, and preventing stains and wear on stainless steel after cutting, thereby improving cutting efficiency and product quality. Detailed Implementation

[0051] The present application will be further described in detail below with reference to the embodiments.

[0052] Partial ingredient descriptions:

[0053] Amine and propylene oxide polymer, brand and model: Chenghua T-1001;

[0054] Chenghua T-1000, a brand of imidazoline oleate;

[0055] Long-chain linear alkylbenzene high-base-value synthetic calcium sulfonate brand Chenghua T106B:

[0056] Calcium alkylphenol sulfide, brand name: Chenghua T115B;

[0057] Alkyl salicylate calcium brand Chenghua T109;

[0058] Chenghua T-405, a brand of sulfurized olefin cottonseed oil;

[0059] 1. Phenylenol-α-naphthylamine, brand and model: Chenghua T-531;

[0060] Brand and model of dioctyl basic zinc salt, thiophosphoric acid, Chenghua T203;

[0061] Nitrogen-containing borate ester brand and model: Chenghua T1011;

[0062] Borated high molecular weight succinimide, brand and model: Chenghua T-161B;

[0063] Polyisobutylene succinic anhydride brand and model: Chenghua T2007A;

[0064] Epoxidized soybean oil CAS 8013-07-8;

[0065] Ethylene-propylene copolymer brand Chenghua T-613;

[0066] Chlorinated paraffin brand and model: INEOS Cereclor S52;

[0067] Isobutylene sulfide, CAS No. 68937-96-2;

[0068] Polyalphaolefin TAFMER A-35070S Mitsui Chemicals.

[0069] Example

[0070] Example 1

[0071] A high-temperature resistant and high-lubricating stainless steel cutting oil is prepared by the following method:

[0072] Weigh out 5 parts by weight of polyisobutylene succinic anhydride, 6.5 parts of amine and propylene oxide polymer, 15 parts of boron-containing compound, 17 parts of basic alkyl salt, 0.5 parts of imidazoline oleate, 5 parts of antioxidant compound, and 1.2 parts of ethylene-propylene copolymer and place them in a stirring device. Stir at 60 r / min for 10 min to ensure thorough mixing and obtain the additive.

[0073] Weigh out 60% base oil, 15% additives, 20% extruder, 4% diluent, and 1% demulsifier by weight percentage and place them into a mixing device. Mix at 60 r / min for 20 minutes to ensure thorough and uniform mixing, thus obtaining the cutting oil.

[0074] The basic alkyl salt is composed of type A basic alkyl salt and type B basic alkyl salt in a weight ratio of 1:0.4; type A basic alkyl salt is calcium alkylphenol sulfide; type B basic alkyl salt is calcium sulfonate synthesized from long-chain linear alkylbenzene with high basicity; the total basicity of type B basic alkyl salt is greater than that of type A basic alkyl salt, wherein the total basicity of type A basic alkyl salt is preferably 150-250 mgKOH / g, and the total basicity of type B basic alkyl salt is preferably 300-400 mgKOH / g. In this embodiment, the total basicity of calcium alkylphenol sulfide is 250 mgKOH / g, and the total basicity of calcium sulfonate synthesized from long-chain linear alkylbenzene with high basicity is 320 mgKOH / g.

[0075] The antioxidant compound consists of sulfurized olefin cottonseed oil and thiophosphoric dioctyl basic zinc salt in a 1:1 weight ratio. The base oil consists of vegetable oil and polyalphaolefin in a 9:1 weight ratio. The diluent consists of methyl oleate and ethyl palmitate in a 1:1 weight ratio. The boron compound is a nitrogen-containing borate ester. The polyisobutylene succinic anhydride is polyisobutylene succinic anhydride. The demulsifier is polyoxyethylene ether. The extreme pressure agent consists of sulfurized isobutylene and chlorinated paraffin in a 1:1 weight ratio.

[0076] Example 2

[0077] The difference between Example 2 and Example 1 lies in the amount of raw materials used, as detailed below:

[0078] By weight, the composition is: 10 parts polyisobutylene succinic anhydride, 3.4 parts amine and propylene oxide polymer, 18 parts boron-containing compound, 15 parts basic alkyl salt, 1.2 parts imidazoline oleate, 4 parts antioxidant compound, and 1.8 parts ethylene-propylene copolymer.

[0079] Weigh out 58% base oil, 17% additives, 18% extrusion compound, 5% diluent, and 2% demulsifier by weight percentage.

[0080] Example 3

[0081] The difference between Example 3 and Example 1 lies in the amount of raw materials used, as detailed below:

[0082] By weight, the composition is: 15 parts polyisobutylene succinic anhydride, 2.5 parts amine and propylene oxide polymer, 23 parts boron-containing compound, 13 parts basic alkyl salt, 1.8 parts imidazoline oleate, 3 parts antioxidant compound, and 3.2 parts ethylene-propylene copolymer.

[0083] Weigh out 50% base oil, 20% additives, 15% extruder, 14% diluent, and 1% demulsifier by weight percentage.

[0084] Example 4

[0085] The difference between Example 4 and Example 2 is that the basic alkyl salt is composed of a type B basic alkyl salt and a type A basic alkyl salt in a weight ratio of 1:1.

[0086] Example 5

[0087] The difference between Example 5 and Example 4 is that the type A basic alkyl salt is calcium alkyl salicylate.

[0088] Example 6

[0089] The difference between Example 6 and Example 4 is that the type A basic alkyl salt is composed of calcium alkylphenol sulfide and calcium alkyl salicylate in a weight ratio of 1:1.

[0090] Example 7

[0091] The difference between Example 7 and Example 4 is that the type A basic alkyl salt is composed of calcium alkylphenol sulfide and calcium alkyl salicylate in a weight ratio of 1:5.

[0092] Example 8

[0093] The difference between Example 8 and Example 6 is that the antioxidant compound consists of sulfurized olefin cottonseed oil and N-phenyl-α-naphthylamine in a weight ratio of 1:1.

[0094] Example 9

[0095] The difference between Example 9 and Example 4 is that the antioxidant compound consists of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl)basic zinc salt in a weight ratio of 5:1:2.

[0096] Example 10

[0097] The difference between Example 10 and Example 8 is that the antioxidant compound consists of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl)basic zinc salt in a weight ratio of 5:1:2.

[0098] Example 11

[0099] The difference between Example 11 and Example 8 is that the antioxidant compound consists of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl)basic zinc salt in a weight ratio of 5:3:5.

[0100] Example 12

[0101] The difference between Example 12 and Example 4 is that the boron compound is boronized high molecular weight succinimide.

[0102] Example 13

[0103] The difference between Example 13 and Example 4 is that the boron compound is composed of a nitrogen-containing borate ester and a boronized high molecular weight succinimide in a weight ratio of 1:1.

[0104] Example 14

[0105] The difference between Example 14 and Example 6 is that the boron compound is composed of a nitrogen-containing borate ester and a boronized high molecular weight succinimide in a weight ratio of 1:1.

[0106] Example 15

[0107] The difference between Example 15 and Example 11 is that the boron compound is composed of a nitrogen-containing borate ester and a boronized high molecular weight succinimide in a weight ratio of 1:1.

[0108] Example 16

[0109] The difference between Example 16 and Example 12 is that the boron compound is composed of a nitrogen-containing borate ester and a boronized high molecular weight succinimide in a weight ratio of 1:3.

[0110] Comparative Example

[0111] Comparative Example 1

[0112] The difference between Comparative Example 1 and Example 1 is that polyisobutylene succinic anhydride is replaced in equal amounts with an amine and propylene oxide polymer.

[0113] Comparative Example 2

[0114] The difference between Comparative Example 2 and Example 1 is that the boron-containing compound is replaced in equal amounts with an alkaline alkyl salt.

[0115] Comparative Example 4

[0116] The difference between Comparative Example 4 and Example 1 is that the basic alkyl salt was replaced with an equal amount of boron-containing compound.

[0117] Comparative Example 5

[0118] The difference between Comparative Example 5 and Example 1 is that the basic alkyl salt is a type B basic alkyl salt.

[0119] Comparative Example 6

[0120] The difference between Comparative Example 6 and Example 1 is that the basic alkyl salt is a type A basic alkyl salt.

[0121] Comparative Example 7

[0122] The difference between Comparative Example 7 and Example 1 is that the antioxidant compound is a thiophosphoric dioctyl basic zinc salt.

[0123] Performance testing

[0124] The cutting oils obtained in Examples 1-16 and Comparative Examples 1-6 were used for cutting stainless steel parts (material 304) using turning. The pressure was 0.5 MPa, the flow rate was 12 L / min, the oil temperature was 45℃, the turning time was 80 min, and the turning speed was 80 min / m. The cutting oil after cutting was then recycled and filtered through a 1000 mesh filter. The filtrate obtained after filtration was recycled and reused to cut the next stainless steel part, and the cut stainless steel part was then subjected to the following experimental tests.

[0125] Testing Methods / Experimental Methods for Antioxidant: Cutting oils that have undergone 50 recycling cycles and those that have not undergone recycling cycles (cutting oils obtained in Examples 1-16 and Comparative Examples 1-6) were tested using a color difference tester. The color difference between the cutting oils that have undergone 50 recycling cycles and those that have not been recycled cycles was compared to obtain the corresponding color difference values. The smaller the change in color difference value, the better the antioxidant properties.

[0126] Anti-wear lubrication: The friction coefficient was tested according to SH / T 0190-1992 on an MM-200 wear testing machine. The friction coefficient change rate of the cutting oil after 50 cycles of recycling was obtained by comparing Examples 1-16 and Comparative Examples 1-6. The friction coefficient change rate is equal to the friction coefficient of the cutting oil without recycling minus the friction coefficient after 50 cycles of recycling, then divided by the friction coefficient of the cutting oil without recycling, and finally the remainder is 100%. The smaller the friction coefficient, the better the anti-wear lubrication performance, and the smaller the friction coefficient change rate, the better the oxidation resistance.

[0127] Cleanliness: The stainless steel obtained after 50 cycles of recycling is cut and the area of ​​stains, discoloration, etc. on the surface is observed. The percentage of the stain area is not calculated. The higher the percentage of the stain area, the better the cleanliness.

[0128] The specific data is shown in Table 1.

[0129] Table 1. Experimental data of Examples 1-16 and Comparative Examples 1-6

[0130]

[0131]

[0132] As can be seen from Table 1 above, compared with Comparative Examples 1-6, the color difference values ​​of Comparative Examples 1-6 are larger, indicating a greater color difference. However, the friction coefficient, friction coefficient change rate, and stain area ratio of Example 1 are lower. This indicates that the cutting oil possesses excellent comprehensive properties such as anti-oxidation, cleaning, and demulsification through the synergistic effect of the components of this application, including polyisobutylene succinic anhydride, amine and propylene oxide polymer, boron-containing compounds, basic alkyl salts, imidazoline oleate, antioxidant compounds, and ethylene-propylene copolymer. This ensures the quality stability of the cutting oil during the recycling process and guarantees the quality of stainless steel and the durability of the cutting oil.

[0133] As can be seen from Table 1 above, compared with Example 4, Example 4 has a larger color difference value, indicating a larger color difference. However, Example 6 has a lower friction coefficient, friction coefficient change rate, and stain area ratio, indicating that the combination of alkylphenol calcium sulfide and alkyl salicylate calcium has a synergistic effect, further improving the overall performance.

[0134] As can be seen from Table 1 above, compared with Example 5, Example 5 has a larger color difference value, indicating a larger color difference. However, Example 11 has a lower friction coefficient, friction coefficient change rate, and stain area ratio, indicating that the combination of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl) basic zinc salt has a synergistic effect, further improving the overall performance.

[0135] As can be seen from Table 1 above, compared with Example 15, Example 15 has a smaller color difference value, indicating a smaller color difference. However, Example 11 has a higher friction coefficient, friction coefficient change rate, and stain area ratio, indicating that the use of nitrogen-containing borate ester and boronized high molecular weight succinimide has a synergistic effect, further enhancing its comprehensive performance, improving the stability of cutting oil in the cutting process, reducing the phenomenon of wear and residual stains on stainless steel, and ensuring the smooth progress of the cutting process and the improvement of product quality.

[0136] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-temperature resistant, high-lubricating stainless steel cutting oil, characterized in that, It consists of the following raw materials by weight percentage: Base oil 50-60% Extreme pressure agent 15-20% Additives 15-20% Antiemulsifier 1-3% The remainder is diluent; The additive is composed of the following raw materials in parts by weight: 5-15 parts of polyisobutylene succinic anhydride 2.5-6.5 parts of amine-propylene oxide polymer. 15-23 parts of boron-containing compounds 13-17 parts of basic alkyl salt Imidazoline oleate 0.5-1.8 parts 3-5 parts of antioxidant compounds 1.2-3.2 parts of ethylene-propylene copolymer; The basic alkyl salt is composed of type A basic alkyl salt and type B basic alkyl salt in a weight ratio of 1:(0.4-1); the type A basic alkyl salt is calcium alkylphenol sulfide and / or calcium alkyl salicylate; the type B basic alkyl salt is long-chain linear alkylbenzene high-base-value synthetic calcium sulfonate; the total base value of the type B basic alkyl salt is greater than the total base value of the type A basic alkyl salt; the antioxidant compound is composed of multiple components including sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric bis(octyl) basic zinc salt; The boron-containing compound is composed of a nitrogen-containing borate ester and a boronized high molecular weight succinimide in a weight ratio of 1:(1-3); The total base value of the type A basic alkyl salt is 150-250 mg KOH / g, and the total base value of the type B basic alkyl salt is 300-400 mg KOH / g; The base oil is composed of one or more of mineral oil, vegetable oil, and polyalphaolefin; The diluent is one or more of the following: methyl oleate, ethyl palmitate, epoxidized soybean oil, ethyl acetate, n-butyl acetate, n-butanol, ethanol, and cashew nut shell oil.

2. The high-temperature resistant, high-lubricity stainless steel cutting oil according to claim 1, characterized in that: The extreme pressure agent is sulfide isobutylene and / or chlorinated paraffin.

3. The high-temperature resistant, high-lubricity stainless steel cutting oil according to claim 1, characterized in that: The type A basic alkyl salt is composed of calcium alkylphenolate sulfide and calcium alkyl salicylate in a weight ratio of 1:(1-5).

4. The high-temperature resistant, high-lubricity stainless steel cutting oil according to claim 1, characterized in that: The antioxidant compound is composed of sulfurized olefin cottonseed oil, N-phenyl-α-naphthylamine, and thiophosphoric dioctyl basic zinc salt in a weight ratio of 5:(1-3):(2-5).

5. A method for preparing a high-temperature resistant, high-lubricity stainless steel cutting oil as described in any one of claims 1-4, characterized in that, Includes the following steps: According to the weight parts, weigh out polyisobutylene succinic anhydride, amine and propylene oxide polymer, boron-containing compound, basic alkyl salt, imidazoline oleate, antioxidant compound, and ethylene-propylene copolymer, mix them evenly to obtain the additive; Weigh the base oil, additives, diluents, demulsifiers, and extreme pressure agents according to their weight percentages, mix them evenly, and you will get the cutting oil.

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