A new energy-saving and environment-friendly lubricating oil for engines

Abstract

The present application relates to the technical field of lubricating oil, in particular to a novel energy-saving and environment-friendly lubricating oil for engine.The novel energy-saving and environment-friendly lubricating oil for engine comprises the following raw materials in parts by weight: 75-85 parts of base oil, 1.5-3 parts of anti-oxidation preservative, 5-8 parts of detergent, 4-6 parts of dispersant, 1-3 parts of modified anti-rust agent, 0.1-0.5 parts of anti-foaming agent and 1.5-3 parts of polymethyl acrylate.The novel energy-saving and environment-friendly lubricating oil for engine has excellent lubricating performance and corrosion and rust prevention performance, and the rust prevention performance has certain long-acting property, which can continuously play the rust prevention performance for a long time.

Description

Technical Field

[0001] This invention relates to the field of lubricant technology, and in particular to a novel energy-saving and environmentally friendly lubricant for engines. Background Technology

[0002] With the rapid development of the automotive industry, my country has become a major automobile producer and consumer, and automobile sales continue to grow. Automobiles have become an indispensable part of people's lives. The automobile engine, which provides power to the car, is its heart and affects its power, economy, and environmental performance. To maintain the engine's good performance, engine lubricating oil is typically used for protection.

[0003] Engine lubricating oil mainly consists of two parts: base oil and additives. Base oil is the main component of lubricating oil, determining its basic properties, while additives can compensate for and improve the shortcomings of base oil performance, imparting certain new properties, and are an important component of lubricating oil.

[0004] Patent document CN109504496A discloses an engine graphene lubricant, which includes modifiers comprising graphene, hexagonal boron nitride nanosheets, and bioenzymes; the lubricant is obtained by adding the modifiers to a base oil and stirring. Patent document CN104946367A discloses an engine-specific lubricant and its preparation method, which includes a composite base oil, a composite antioxidant and corrosion inhibitor, a composite detergent, a dispersant, a metal deactivator, a rust inhibitor, an antifoaming agent, and polymethyl methacrylate. The engine-specific lubricant prepared by this invention can automatically adjust the oil film thickness, has better shear resistance, and also exhibits good low-temperature fluidity and low-temperature starting performance.

[0005] Although the above-mentioned lubricating oils all have good lubrication performance, in actual use, their poor rust prevention performance often causes the engine to rust, which in turn affects the normal operation and service life of the engine. Summary of the Invention

[0006] In view of this, the purpose of this invention is to propose a new type of energy-saving and environmentally friendly lubricating oil for engines, so as to solve the problem of poor rust prevention performance of traditional lubricating oils.

[0007] To achieve the above objectives, the present invention provides a novel energy-saving and environmentally friendly lubricating oil for engines, comprising the following raw materials in parts by weight: 75-85 parts base oil, 1.5-3 parts antioxidant corrosion inhibitor, 5-8 parts detergent, 4-6 parts dispersant, 1-3 parts modified rust inhibitor, 0.1-0.5 parts antifoaming agent, and 1.5-3 parts polymethyl methacrylate;

[0008] The preparation steps of the modified rust inhibitor are as follows:

[0009] S1: Sodium dodecylbenzenesulfonate, Triton X-100 and deionized water were added to a single-necked flask and stirred at room temperature for 30-60 min to obtain a homogeneous solution. Then the flask was placed in an ice-water bath. Tetraisopropyl titanate and benzotriazole were then mixed in ethanol and sonicated for 10 min until the solution was completely dissolved. The solution was then added dropwise to the flask and stirred for 4-5 h. After filtration, titanium dioxide nanocapsules loaded with benzotriazole were obtained.

[0010] S2: Graphene oxide was dispersed in a 95% ethanol aqueous solution and ultrasonically dispersed for 2 hours. Then KH-550 was added and ultrasonically homogenized at 30-40℃. After stirring at 80-85℃ for 3-4 hours, the mixture was filtered, washed, and dried to obtain amino-based graphene.

[0011] S3: Mix amino graphene, propyltriethoxysilane isocyanate, dibutyltin diacetate and acetone, stir at 40-45℃ for 6-7h, centrifuge, filter and dry to obtain functionalized graphene.

[0012] S4: Functionalized graphene is dispersed in deionized water to obtain a functionalized graphene dispersion. Then, a titanium dioxide nanocapsule aqueous dispersion loaded with benzotriazole is added to the functionalized graphene dispersion, the pH is adjusted to 9, and the mixture is soaked in ice water for 6-7 hours to obtain modified graphene.

[0013] S5: Disperse the modified graphene in deionized water, sonicate for 30 min, then add barium petroleum sulfonate, stir at 60℃ for 20-24 h, then add hydrazine monohydrate, filter the product, wash, dry, and obtain the modified rust inhibitor.

[0014] The ratio of sodium dodecylbenzenesulfonate, Triton X-100, deionized water, tetraisopropyl titanate, benzotriazole, and ethanol used in step S1 is 0.1-0.2g:0.1-0.2g:80-100g:2-3g:2-2.5g:10-20ml;

[0015] The ratio of graphene oxide, ethanol aqueous solution, and KH-550 used in step S2 is 1-2g: 100-150ml: 3-6g;

[0016] In step S3, the ratio of aminographene, propyltriethoxysilane isocyanate, dibutyltin diacetate, and acetone is 0.5-1g:0.1-0.2g:0.05-0.07g:25-30ml;

[0017] The ratio of the amount of functionalized graphene, deionized water, and titanium dioxide nanocapsule aqueous dispersion loaded with benzotriazole in step S4 is 0.5-1g:50-100ml:15-20g.

[0018] The ratio of modified graphene, deionized water, barium petroleum sulfonate, and hydrazine monohydrate used in step S5 is 2-3g:500ml:5-10g:10-15ml.

[0019] Preferably, the base oil is base oil PAO8.

[0020] Preferably, the antioxidant preservative is one of zinc thiophosphoric acid bis(octyl) zinc salt and molybdenum dialkyl dithiocarbamate salt.

[0021] Preferably, the detergent is calcium alkylphenol sulfide.

[0022] Preferably, the dispersant is polyisobutylene succinimide.

[0023] Preferably, the antifoaming agent is one of silicone-based antifoaming agents or non-silicone-based antifoaming agents.

[0024] Preferably, the concentration of the aqueous dispersion of titanium dioxide nanocapsules loaded with benzotriazole in step S4 is 10%.

[0025] Furthermore, the present invention also provides a novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps of which are as follows:

[0026] Half of the base oil is heated and premixed with antioxidants, corrosion inhibitors, detergents, dispersants, modified rust inhibitors, and polymethyl methacrylate to obtain a semi-finished product. The semi-finished product is then mixed with the remaining base oil, and an anti-foaming agent is added. After thorough mixing, the mixture is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0027] The beneficial effects of this invention are:

[0028] The present invention provides a novel energy-saving and environmentally friendly lubricating oil for engines, which has excellent lubrication performance and anti-corrosion and anti-rust properties. Furthermore, its anti-rust properties have a certain long-lasting effect and can continuously exert anti-rust performance for a long time.

[0029] The present invention provides a novel energy-saving and environmentally friendly lubricating oil for engines. By surface-treating modified graphene, the modified rust inhibitor is more evenly dispersed in the base oil, preventing agglomeration. This results in a significant improvement in the anti-wear, anti-corrosion, and rust-preventive properties of the lubricating oil.

[0030] The present invention relates to a novel energy-saving and environmentally friendly lubricating oil for engines. The invention first encapsulates benzotriazole in nano-titanium dioxide nanocapsules, and then loads them onto the surface of graphene. By first encapsulating it on the load, benzotriazole can be slowly and continuously released as the surface protective film is continuously damaged by friction. This significantly improves the anti-wear, anti-corrosion, and anti-rust properties of the lubricating oil, especially its long-term anti-rust properties. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0032] Example 1: A novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps are as follows:

[0033] (1) 0.1g sodium dodecylbenzenesulfonate, 0.1g Triton X-100 and 80g deionized water were added to a single-necked flask and stirred at room temperature for 30 min to obtain a homogeneous solution. Then the flask was placed in an ice-water bath. Subsequently, 2g tetraisopropyl titanate and 2g benzotriazole were mixed into 10ml ethanol and ultrasonically vibrated for 10 min until the solution was completely dissolved. Then the solution was added dropwise to the flask and stirred for 4 h. The product was filtered three times with ice water to obtain titanium dioxide nanocapsules loaded with benzotriazole.

[0034] (2) 1g of graphene oxide was dispersed in 100ml of 95% ethanol aqueous solution and ultrasonically dispersed for 2h. Then 3g of KH-550 was added, and the mixture was ultrasonically homogenized at 30℃. After stirring at 80℃ for 3h, the mixture was filtered, washed, and dried to obtain amino graphene.

[0035] (3) Mix 0.5g of amino graphene, 0.1g of propyltriethoxysilane isocyanate, 0.05g of dibutyltin diacetate and 25ml of acetone, stir at 40℃ for 6h, and centrifuge, filter and dry the product at 8000rpm to obtain functionalized graphene.

[0036] (4) Disperse 0.5g of functionalized graphene in 50ml of deionized water to obtain functionalized graphene dispersion. Then add 15g of 10 wt% titanium dioxide nanocapsule aqueous dispersion loaded with benzotriazole to the functionalized graphene dispersion, adjust the pH value to 9, and soak the mixture in ice water for 6h to obtain modified graphene.

[0037] (5) Disperse 2g of modified graphene in 500ml of deionized water, sonicate for 30min, then add 5g of barium petroleum sulfonate, stir at 60℃ for 20h, then add 10ml of hydrazine monohydrate, filter the product with cellulose paper, wash with deionized water, and dry at 60℃ for 72h to obtain the modified rust inhibitor.

[0038] (6) After heating half of the base oil PAO8, it is premixed with 1.5g of zinc bis(octyl)thiophosphate salt, 5g of calcium alkylphenol sulfide, 4g of polyisobutylene succinimide, 1g of modified rust inhibitor and 1.5g of polymethyl methacrylate to obtain a semi-finished product; the semi-finished product is mixed with the other half of the base oil again, and 0.1g of silicone antifoaming agent is added at the same time. After mixing evenly, it is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0039] Example 2: A novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps are as follows:

[0040] (1) 0.15 g sodium dodecylbenzenesulfonate, 0.15 g Triton X-100 and 90 g deionized water were added to a single-necked flask and stirred at room temperature for 50 min to obtain a homogeneous solution. Then the flask was placed in an ice-water bath. Subsequently, 2.5 g tetraisopropyl titanate and 2.3 g benzotriazole were mixed into 15 ml ethanol and sonicated for 10 min until the solution was completely dissolved. Then the solution was added dropwise to the flask and stirred for 5 h. The product was filtered three times with ice water to obtain titanium dioxide nanocapsules loaded with benzotriazole.

[0041] (2) 1.5g of graphene oxide was dispersed in 130ml of 95% ethanol aqueous solution and ultrasonically dispersed for 2h. Then 4.5g of KH-550 was added, and the mixture was ultrasonically homogenized at 35℃. After stirring at 83℃ for 4h, the mixture was filtered, washed, and dried to obtain amino graphene.

[0042] (3) Mix 0.8g of amino graphene, 0.15g of propyltriethoxysilane isocyanate, 0.06g of dibutyltin diacetate and 28ml of acetone, stir at 43°C for 6h, and centrifuge, filter and dry the product at 8000rpm to obtain functionalized graphene.

[0043] (4) Disperse 0.8g of functionalized graphene in 80ml of deionized water to obtain functionalized graphene dispersion. Then add 18g of 10 wt% titanium dioxide nanocapsule aqueous dispersion loaded with benzotriazole to the functionalized graphene dispersion, adjust the pH value to 9, and soak the mixture in ice water for 7h to obtain modified graphene.

[0044] (5) Disperse 2.5g of modified graphene in 500ml of deionized water, sonicate for 30min, then add 8g of barium petroleum sulfonate, stir at 60℃ for 22h, then add 13ml of hydrazine monohydrate, filter the product with cellulose paper, wash with deionized water, and dry at 60℃ for 72h to obtain the modified rust inhibitor.

[0045] (6) After heating half of the base oil PAO8, it is premixed with 2g of zinc bis(octyl)thiophosphate salt, 7g of calcium alkylphenol sulfide, 5g of polyisobutylene succinimide, 2g of modified rust inhibitor and 2g of polymethyl methacrylate to obtain a semi-finished product; the semi-finished product is mixed with the other half of the base oil again, and 0.3g of silicone antifoaming agent is added at the same time. After mixing evenly, it is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0046] Example 3: A novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps are as follows:

[0047] (1) 0.2g sodium dodecylbenzenesulfonate, 0.2g Triton X-100 and 100g deionized water were added to a single-necked flask and stirred at room temperature for 60min to obtain a homogeneous solution. Then the flask was placed in an ice-water bath. Subsequently, 3g tetraisopropyl titanate and 2.5g benzotriazole were mixed into 20ml ethanol and sonicated for 10min until the solution was completely dissolved. Then the solution was added dropwise to the flask and stirred for 5h. The product was filtered three times with ice water to obtain titanium dioxide nanocapsules loaded with benzotriazole.

[0048] (2) 2g of graphene oxide was dispersed in 150ml of 95% ethanol aqueous solution and ultrasonically dispersed for 2h. Then 6g of KH-550 was added, and the mixture was ultrasonically homogenized at 40℃. After stirring at 85℃ for 4h, the mixture was filtered, washed, and dried to obtain amino graphene.

[0049] (3) Mix 1g of amino graphene, 0.2g of propyltriethoxysilane isocyanate, 0.07g of dibutyltin diacetate and 30ml of acetone, stir at 45°C for 7h, and centrifuge, filter and dry the product at 8000rpm to obtain functionalized graphene.

[0050] (4) Disperse 1g of functionalized graphene in 100ml of deionized water to obtain functionalized graphene dispersion. Then add 20g of 10 wt% titanium dioxide nanocapsule aqueous dispersion loaded with benzotriazole to the functionalized graphene dispersion, adjust the pH value to 9, and soak the mixture in ice water for 7h to obtain modified graphene.

[0051] (5) Disperse 3g of modified graphene in 500ml of deionized water, sonicate for 30min, then add 10g of barium petroleum sulfonate, stir at 60℃ for 24h, then add 15ml of hydrazine monohydrate, filter the product with cellulose paper, wash with deionized water, and dry at 60℃ for 72h to obtain the modified rust inhibitor.

[0052] (6) After heating half of the base oil PAO8, it is premixed with 3g of zinc bis(octyl)thiophosphate salt, 8g of calcium alkylphenol sulfide, 6g of polyisobutylene succinimide, 3g of modified rust inhibitor and 3g of polymethyl methacrylate to obtain a semi-finished product; the semi-finished product is mixed with the other half of the base oil again, and 0.5g of silicone antifoaming agent is added at the same time. After mixing evenly, it is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0053] Comparative Example 1: A novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps of which are as follows:

[0054] (1) 0.15 g sodium dodecylbenzenesulfonate, 0.15 g Triton X-100 and 90 g deionized water were added to a single-necked flask and stirred at room temperature for 50 min to obtain a homogeneous solution. Then the flask was placed in an ice-water bath. Subsequently, 2.5 g tetraisopropyl titanate and 2.3 g benzotriazole were mixed into 15 ml ethanol and sonicated for 10 min until the solution was completely dissolved. Then the solution was added dropwise to the flask and stirred for 5 h. The product was filtered three times with ice water to obtain titanium dioxide nanocapsules loaded with benzotriazole.

[0055] (2) 1.5g of graphene oxide was dispersed in 130ml of 95% ethanol aqueous solution and ultrasonically dispersed for 2h. Then 4.5g of KH-550 was added, and the mixture was ultrasonically homogenized at 35℃. After stirring at 83℃ for 4h, the mixture was filtered, washed, and dried to obtain amino graphene.

[0056] (3) Mix 0.8g of amino graphene, 0.15g of propyltriethoxysilane isocyanate, 0.06g of dibutyltin diacetate and 28ml of acetone, stir at 43°C for 6h, and centrifuge, filter and dry the product at 8000rpm to obtain functionalized graphene.

[0057] (4) Disperse 0.8g of functionalized graphene in 80ml of deionized water to obtain functionalized graphene dispersion. Then add 18g of 10 wt% titanium dioxide nanocapsule aqueous dispersion loaded with benzotriazole to the functionalized graphene dispersion, adjust the pH value to 9, and soak the mixture in ice water for 7h to obtain modified rust inhibitor.

[0058] (5) After heating half of the base oil PAO8, it is premixed with 2g of zinc bis(octyl)thiophosphate salt, 7g of calcium alkylphenol sulfate, 5g of polyisobutylene succinimide, 2g of modified rust inhibitor and 2g of polymethyl methacrylate to obtain a semi-finished product; the semi-finished product is mixed with the other half of the base oil again, and 0.3g of silicone antifoaming agent is added at the same time. After mixing evenly, it is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0059] Comparative Example 2: A novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps of which are as follows:

[0060] (1) 0.15 g sodium dodecylbenzenesulfonate, 0.15 g Triton X-100 and 90 g deionized water were added to a single-necked flask and stirred at room temperature for 50 min to obtain a homogeneous solution. Then the flask was placed in an ice-water bath. Subsequently, 2.5 g tetraisopropyl titanate and 2.3 g benzotriazole were mixed into 15 ml ethanol and sonicated for 10 min until the solution was completely dissolved. Then the solution was added dropwise to the flask and stirred for 5 h. The product was filtered three times with ice water to obtain titanium dioxide nanocapsules loaded with benzotriazole.

[0061] (2) 2.5g of graphene oxide was dispersed in 500ml of deionized water and ultrasonically treated for 30min. Then 8g of barium petroleum sulfonate was added and stirred at 60℃ for 22h. Then 13ml of hydrazine monohydrate was added. The product was then filtered with cellulose paper, washed with deionized water, and dried at 60℃ for 72h to obtain modified graphene. Then it was mixed with 18g of 10 wt% titanium dioxide nanocapsule aqueous dispersion loaded with benzotriazole to obtain modified rust inhibitor.

[0062] (3) After heating half of the base oil PAO8, it is premixed with 2g of zinc bis(octyl)thiophosphate salt, 7g of calcium alkylphenol sulfide, 5g of polyisobutylene succinimide, 2g of modified rust inhibitor and 2g of polymethyl methacrylate to obtain a semi-finished product; the semi-finished product is mixed with the other half of the base oil again, and 0.3g of silicone antifoaming agent is added at the same time. After mixing evenly, it is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0063] Comparative Example 3: A novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps of which are as follows:

[0064] (1) Mix 2.5g graphene oxide, 8g barium petroleum sulfonate, 2.3g benzotriazole and 2g nano titanium dioxide to obtain a modified rust inhibitor;

[0065] (2) After heating half of the base oil PAO8, it is premixed with 2g of zinc bis(octyl)thiophosphate salt, 7g of calcium alkylphenol sulfide, 5g of polyisobutylene succinimide, 2g of modified rust inhibitor and 2g of polymethyl methacrylate to obtain a semi-finished product; the semi-finished product is mixed with the other half of the base oil again, and 0.3g of silicone antifoaming agent is added at the same time. After mixing evenly, it is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0066] Comparative Example 4: A novel energy-saving and environmentally friendly lubricating oil for engines, the specific preparation steps of which are as follows:

[0067] (1) Mix 8g of barium petroleum sulfonate and 2.3g of benzotriazole to obtain a modified rust inhibitor;

[0068] (2) After heating half of the base oil PAO8, it is premixed with 2g of zinc bis(octyl)thiophosphate salt, 7g of calcium alkylphenol sulfide, 5g of polyisobutylene succinimide, 2g of modified rust inhibitor and 2g of polymethyl methacrylate to obtain a semi-finished product; the semi-finished product is mixed with the other half of the base oil again, and 0.3g of silicone antifoaming agent is added at the same time. After mixing evenly, it is filtered to obtain a new type of energy-saving and environmentally friendly lubricating oil for engines.

[0069] Performance testing

[0070] Copper strip corrosion test: The test was conducted according to GB / T 5096, with the test temperature set at 150 ℃. The color of the copper strip before and after the test was measured to evaluate the corrosiveness of the oil to the metal. After the experiment, the darker the color of the copper sheet, the stronger its corrosiveness. The KD-R1093 lubricating oil copper sheet corrosion tester was used. The copper sheet material was electrolytic copper with a length of 75 mm, a width of 12.5 mm, a thickness of 3 mm, and a purity of 99.9% or higher. The specific experimental steps were as follows: The samples were placed in 30 ml test tubes. A polished copper sheet and cleaned with n-heptane was placed on an electronic balance to weigh the copper sheet. The copper sheet was then placed in a test tube containing rust-preventive lubricating oil and plugged with an open cork. The instrument heating temperature was set to 150℃. The instrument was turned on and the temperature was allowed to reach 150℃. The test tube containing the copper sheet and rust-preventive lubricating oil was then placed in the test tube slot of the instrument. At the same time, the timer was turned on. After a certain time, the instrument was turned off, the copper sheet was removed, cooled to room temperature, washed with n-heptane, and dried with filter paper. The corrosion level was determined by comparing with the standard color chart. The test results are shown in Table 1.

[0071] Salt spray test: The test was conducted according to SH / T 0081. The salt spray test standard uses 45 steel test pieces. The specific test steps are as follows: Prepare a 5% saline solution with deionized water and NaCl, and adjust the pH value to 6.5-7.2 with sodium hydroxide and hydrochloric acid. Pour the solution into the water tank of the salt spray chamber. Polish the 45 steel test piece, wash it with anhydrous ethanol, dry it, and then coat it with anti-rust lubricating oil. After draining for 24 hours, place it on the test piece support in the salt spray chamber according to the standard. Observe and record the time of full corrosion of the 60×80 evaluation surface (initial corrosion) and the central 50×50 evaluation surface. The test results are shown in Table 1.

[0072] Friction and wear test: Friction and wear test was carried out using a high temperature (150℃) reciprocating friction tester (HT-1000), and the three-dimensional morphology of the wear track was detected by a white light interferometer. The test results are shown in Table 1.

[0073] Table 1 Performance Test Results

[0074]

[0075] Data analysis shows that the new energy-saving and environmentally friendly lubricating oil for engines of the present invention has excellent lubrication performance and anti-corrosion and anti-rust performance. Furthermore, its anti-rust performance has a certain long-lasting effect and can continuously exert its anti-rust performance for a long time.

[0076] As can be seen from the data in Table 1, Example 2 and Comparative Example 1, the surface treatment of modified graphene in this invention improves the anti-wear, anti-corrosion, and anti-rust properties of lubricating oil to a certain extent. This is mainly because the surface treatment of modified graphene makes the modified rust inhibitor more uniformly dispersed in the base oil and prevents agglomeration. On the other hand, due to the high temperature stability and high thermal conductivity of graphene itself, the high temperature resistance of barium petroleum sulfonate attached to its surface is indirectly improved to a certain extent, avoiding the problem of adsorption film detachment caused by high temperature on the metal surface due to high temperature.

[0077] As can be seen from the data in Table 1 of Example 2 and Comparative Example 2, by loading benzotriazole-loaded titanium dioxide nanocapsules onto the graphene surface, the amount of benzotriazole-loaded titanium dioxide nanocapsules added is increased, while the problem of excessive nanoparticle agglomeration is avoided. As a result, the anti-wear, anti-corrosion and anti-rust properties of the lubricating oil are improved to a certain extent.

[0078] As can be seen from the data in Table 1, Example 2 and Comparative Example 3, the present invention, by first coating benzotriazole into nano-titanium dioxide nanocapsules and then loading them onto the surface of graphene, significantly improves the anti-wear, anti-corrosion, and anti-rust properties of the lubricating oil, especially its long-term anti-rust properties. This is mainly because by first coating it onto the loading surface, benzotriazole can be slowly and continuously released as the surface protective film is continuously damaged by friction, thereby ensuring that the lubricating oil has a certain long-term anti-rust performance.

[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A new energy saving and environment friendly lubricating oil for engines, characterized in that, The base oil, the antioxidant preservative, the detergent, the dispersant, the modified anti-rust agent, the antifoaming agent and the polymethyl acrylate are respectively 75-85 parts, 1.5-3 parts, 5-8 parts, 4-6 parts, 1-3 parts, 0.1-0.5 parts and 1.5-3 parts by weight. The preparation steps of the modified anti-rust agent are as follows: S1: sodium dodecyl benzene sulfonate, Triton X-100 and deionized water are added into a single-necked flask, stirred at room temperature for 30-60 min to obtain a uniform solution, then the flask is placed in an ice water bath, and then titanium tetraisopropoxide and benzotriazole are mixed into ethanol, the solution is completely dissolved after ultrasonic vibration for 10 min, and then it is added dropwise into the flask, stirred for 4-5 h, and then filtered to obtain titanium dioxide nanocapsules loaded with benzotriazole; S2: graphene oxide is dispersed in 95% ethanol aqueous solution, ultrasonic dispersion is performed for 2 h, then KH-550 is added, ultrasonic dispersion is performed at 30-40℃ until uniform, stirring is performed at 80-85℃ for 3-4 h, then filtration, washing and drying are performed to obtain aminated graphene; S3: aminated graphene, isocyanate propyl triethoxy silane, dibutyl tin diacetate and acetone are mixed, stirring is performed at 40-45℃ for 6-7 h, then centrifugation, filtration and drying are performed to obtain functionalized graphene; S4: functionalized graphene is dispersed in deionized water to obtain a functionalized graphene dispersion, then the functionalized graphene dispersion is added with a water dispersion of titanium dioxide nanocapsules loaded with benzotriazole, the pH value is adjusted to 9, the mixture is soaked in ice water for 6-7 h to obtain modified graphene; S5: the modified graphene is dispersed in deionized water, ultrasonic treatment is performed for 30 min, then barium petroleum sulfonate is added, stirring is performed at 60℃ for 20-24 h, then hydrazine monohydrate is added, the product is filtered, washed and dried to obtain a modified anti-rust agent; The amount ratio of sodium dodecyl benzene sulfonate, Triton X-100, deionized water, titanium tetraisopropoxide, benzotriazole and ethanol in step S1 is 0.1-0.2g:0.1-0.2g:80-100g:2-3g:2-2.5g:10-20ml; The amount ratio of graphene oxide, ethanol aqueous solution and KH-550 in step S2 is 1-2g:100-150ml:3-6g; The amount ratio of aminated graphene, isocyanate propyl triethoxy silane, dibutyl tin diacetate and acetone in step S3 is 0.5-1g:0.1-0.2g:0.05-0.07g:25-30ml; The amount ratio of functionalized graphene, deionized water and the water dispersion of titanium dioxide nanocapsules loaded with benzotriazole in step S4 is 0.5-1g:50-100ml:15-20g; The amount ratio of modified graphene, deionized water, barium petroleum sulfonate and hydrazine monohydrate in step S5 is 2-3g:500ml:5-10g:10-15ml.

2. The novel energy saving eco-friendly lubricating oil for engines as claimed in claim 1, wherein The base oil is base oil PAO8.

3. The novel energy saving eco-friendly lubricating oil for engines as claimed in claim 1, wherein The antioxidant preservative is one of sulfur phosphorus bis octyl zinc salt and molybdenum dialkyldithiocarbamate salt.

4. The novel energy saving eco-friendly lubricating oil for engines as claimed in claim 1, wherein The detergent is calcium sulfide alkyl phenol.

5. The novel energy saving eco-friendly lubricating oil for engines as claimed in claim 1, wherein The dispersant is polyisobutylene succinimide.

6. The novel energy saving eco-friendly lubricating oil for engines as claimed in claim 1, wherein The anti-foaming agent is one of silicon type anti-foaming agent and non-silicon type anti-foaming agent.

7. The novel energy saving eco-friendly lubricating oil for engines as claimed in claim 1, wherein The concentration of the water dispersion of the loaded benzotriazole titanium dioxide nanocapsule in step S4 is 10%.

8. The novel energy saving eco-friendly lubricating oil for engines as claimed in claim 1, wherein The specific preparation steps are as follows: After half of the base oil is heated, the anti-oxidation preservative, the detergent, the dispersant, the modified anti-rust agent and the polymethacrylate are premixed to obtain a semi-finished product; the semi-finished product is mixed with the remaining base oil, and the anti-foaming agent is added, and then the mixture is uniformly mixed and filtered to obtain a new energy-saving and environment-friendly lubricating oil for engines.

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