Long-life energy-saving hydraulic oil and preparation method thereof

Abstract

The application relates to the technical field of hydraulic system medium, and more specifically to long-life energy-saving hydraulic oil and a preparation method thereof.A kind of long-life energy-saving hydraulic oil, including the following mass parts of raw materials: API Ⅱ type base oil 90-95 parts, ester 2-4 parts, cleaning dispersant 0.2-0.4 parts, antioxidant 0.2-0.4 parts, extreme pressure antiwear agent 0.04-0.06 parts, metal deactivator 0.02-0.04 parts, tackifier 2-4 parts, defoaming agent 0.01-0.03 parts, polymethyl methacrylate pour point depressant 0.1-0.3 parts and propylene oxide copolymer demulsifier 0.01-0.03 parts.The long-life energy-saving hydraulic oil of the application is excellent in compatibility, energy-saving and environment-friendly, has self-cleaning capacity, and has a long service life.

Description

Technical Field

[0001] This application relates to the technical field of hydraulic system media, and more specifically, it relates to a long-life, energy-saving hydraulic oil and its preparation method. Background Technology

[0002] A hydraulic system is a transmission system that uses the pressure energy of hydraulic oil to transmit power and perform control. It transmits the pressure applied to a closed fluid to the fluid in the same way. Hydraulic systems have advantages such as high power density, fast response, and ease of control, and are therefore widely used in mechanical equipment such as automobiles, aircraft, and industrial machinery.

[0003] However, with the continuous improvement of China's manufacturing level, higher requirements have been placed on hydraulic systems, such as high pressure, high efficiency, high precision, large flow, miniaturization, lightweight, integration, and environmental protection and energy saving. At the same time, in order to cope with the changing and complex working environment, higher requirements have also been put forward on the comprehensive performance of hydraulic oil, such as compatibility, viscosity performance, high temperature detergency, oxidation durability, and service life. Summary of the Invention

[0004] To address the shortcomings of conventional hydraulic oils, such as insufficient compatibility, poor energy-saving and environmental performance, weak self-cleaning ability, and short service life, this application provides a long-life energy-saving hydraulic oil and its preparation method.

[0005] In the first aspect, this application provides a long-life, energy-saving hydraulic oil, employing the following technical solution:

[0006] A long-life, energy-saving hydraulic oil comprises the following raw materials in parts by weight: 90-95 parts API Group II base oil, 2-4 parts esters, 0.2-0.4 parts detergent-dispersant, 0.2-0.4 parts antioxidant, 0.04-0.06 parts extreme pressure anti-wear agent, 0.02-0.04 parts metal deactivator, 2-4 parts viscosity index enhancer, 0.01-0.03 parts defoamer, 0.1-0.3 parts polymethyl methacrylate pour point depressant, and 0.01-0.03 parts propylene oxide copolymer demulsifier.

[0007] Preferably, the cleaning and dispersing agent is one of high-alkalinity calcium petroleum sulfonate, polyisobutylene succinimide, calcium petroleum sulfonate, succinimide, and succinate.

[0008] Preferably, the antioxidant is one or more of alkyl diphenylamine, isooctyl β-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate, 2,6-di-tert-butyl-p-cresol, phenolic ester antioxidants, and alkyl phenyl propionate esters.

[0009] Preferably, the extreme pressure anti-wear agent is one of the following: zinc dialkyl dithiophosphate, zinc dialkyl dithiophosphate, alkyl phosphite, phosphate ester, ammonium thiophosphate salt, borate, and sulfonate.

[0010] Preferably, the metal deactivator is one of methylbenzotriazole derivatives, phosphate esters, imidazole derivatives, sulfonates, carboxylic acid derivatives, and carboxylic acid ester derivatives.

[0011] Preferably, the adhesive is one of polymethyl methacrylate, polyisobutylene, and ethylene-propylene copolymer.

[0012] Preferably, the defoamer is one of the following: polyether organic defoamer, polysiloxane type defoamer, acrylate copolymer, methacrylate copolymer, polyethylene glycol ether, polybutylene glycol ether, fatty alcohol, alkyl phosphate ester, and composite defoamer.

[0013] Preferably, the long-life energy-saving hydraulic oil comprises the following raw materials in parts by weight: 90-95 parts of API Group II base oil, 2-4 parts of ester-dioctyl sebacate, 0.2-0.4 parts of detergent-dispersant-high-alkalinity petroleum sulfonate calcium, 0.2-0.4 parts of antioxidant-alkyl diphenylamine, 0.04-0.06 parts of extreme pressure anti-wear agent-zinc dialkyl dithiophosphate, 0.02-0.04 parts of metal deactivator-methylbenzotriazole, 2-4 parts of viscosity index enhancer-polymethyl methacrylate, 0.01-0.03 parts of defoamer-polyether silicone defoamer, 0.1-0.3 parts of polymethyl methacrylate pour point depressant, and 0.01-0.03 parts of propylene oxide copolymer demulsifier.

[0014] The long-life energy-saving hydraulic oil of this application uses various components with high matching degree, which improves the technical defects of unstable base oil quality, extends TOST oxidation time, and takes into account the oil's anti-emulsification performance, hydrolytic stability, storage stability, oxidation resistance and compatibility. At the same time, it obtains a longer thermal stability time, and the oil sample remains clear after the test, with excellent deposit control performance.

[0015] In addition, the long-life energy-saving hydraulic oil of this application effectively disperses metal shavings and sludge deposits in the hydraulic oil by adding nano-level cleaning agents, making the oil easy to filter and avoiding the formation of varnish film, while achieving better oil cleanliness and hydraulic system cleanliness.

[0016] In addition, the long-life energy-saving hydraulic oil of this application uses a linear polymer viscosity index improver, which improves the defect of unstable oil viscosity, extends the oil service cycle, and obtains better anti-wear and anti-corrosion and anti-rust properties.

[0017] Preferably, the long-life energy-saving hydraulic oil further includes 2-4 parts of flame retardant, wherein the flame retardant is a nitrogen-silicon hybrid phosphate flame retardant.

[0018] Preferably, the flame retardant is obtained by combining heptaphenylsilanetriol semisiloxane, diphenyl chlorophosphate and hexachlorocyclotriphosphazene.

[0019] When using large hydraulic equipment such as excavators, they are often near fire sources. The presence of hydraulic oil may have a flame-retardant effect on fire. In addition to preventing the spread of fire, the use of flame retardants can even inhibit the occurrence of fire.

[0020] In this application, a nitrogen-silicon hybrid phosphate flame retardant is selected, which contains three flame retardant elements: nitrogen, silicon, and phosphorus. Specifically, heptaphenylsilanetriol semisiloxane, diphenyl chlorophosphate, and hexachlorocyclotriphosphazene are selected. Hexachlorocyclotriphosphazene is composed of alternating phosphorus and nitrogen atoms. This conjugated structure gives hexachlorocyclotriphosphazene extremely excellent thermal stability.

[0021] During combustion, phosphazene polymers undergo thermal decomposition, an endothermic reaction. The phosphate esters, metaphosphates, and polyphosphates produced during this process form a non-volatile protective film, isolating the air. Simultaneously, phosphazene polymers also produce non-flammable ammonia, including NH3, N2, and NO. X These gases can dilute the concentration of combustible gases produced during combustion.

[0022] In addition, the chlorine atom adjacent to the phosphorus atom in hexachlorocyclotriphosphazene is highly reactive. Therefore, when heptaphenylsilane-semi-siloxane is used in combination with hexachlorocyclotriphosphazene, the chloride ion on hexachlorocyclotriphosphazene will undergo a substitution reaction with the hydroxyl group on heptaphenylsilane-semi-siloxane, thereby linking heptaphenylsilane-semi-siloxane with hexachlorocyclotriphosphazene.

[0023] Heptaphenylsilanetriol semisiloxane is a type of polysiloxane flame retardant. Its flame retardant mechanism lies in the formation of an inorganic oxygen-barrier and heat-insulating protective layer containing Si-O bonds or Si-C bonds characteristic of polysiloxane during combustion. Therefore, when heptaphenylsilanetriol semisiloxane is used in combination with hexachlorocyclotriphosphazene, a synergistic flame retardant effect of nitrogen, phosphorus and silicon tri-elements will be obtained, thus achieving better flame retardant performance.

[0024] Although the product of heptaphenylsilanetriol semisiloxane and hexachlorocyclotriphosphazene contains silicon-oxygen bonds, its compatibility in hydraulic oil is still relatively poor. To further improve the compatibility of the flame retardant in hydraulic oil, the applicant considered using esters as the matrix of the flame retardant, specifically choosing diphenyl chlorophosphate. This allows the chlorine atom on diphenyl chlorophosphate to undergo a substitution reaction with the hydroxyl group on heptaphenylsilanetriol semisiloxane, thereby linking heptaphenylsilanetriol semisiloxane, hexachlorocyclotriphosphazene, and diphenyl chlorophosphate. Furthermore, to avoid the influence of excess chlorine atoms on hexachlorocyclotriphosphazene, the applicant used hydroxyethyl methacrylate to replace the chlorine atoms, achieving a relatively better flame retardant effect.

[0025] Preferably, the flame retardant is prepared by: firstly, condensing heptaphenylsilane-diphenyl phosphate with diphenyl chlorophosphate to obtain heptaphenylol-diphenyl phosphate polyhedral semisilane; then condensing heptaphenylol-diphenyl phosphate polyhedral semisilane with hexachlorocyclotriphosphazene to obtain heptaphenylcyclotriphosphazene-diphenyl phosphate polyhedral semisilane; finally, adding hydroxyethyl methacrylate until chloride ions are removed to obtain the flame retardant.

[0026] Preferably, the preparation method of heptaphenyl alcohol-diphenyl phosphate multifaceted oligomeric semisiloxane is as follows:

[0027] First, heptaphenylsilanetriol semisiloxane and diphenyl chlorophosphate were added to excess anhydrous tetrahydrofuran in a molar ratio of 1:(1.5-2.5). The mixture was then stirred and heated under reflux at a temperature of 40-60°C for 6-10 hours. Finally, the mixture was filtered, the solvent was removed by vacuum distillation, washed and dried to obtain heptaphenylol-diphenyl phosphate polymeric oligomeric semisiloxane.

[0028] Preferably, the method for preparing the flame retardant includes the following steps:

[0029] First, heptaphenyl alcohol-diphenyl phosphate polyhedral oligomeric semisiloxane and hexachlorocyclotriphosphazene were added to excess anhydrous tetrahydrofuran at a molar ratio of 1:(0.5-1.5). The mixture was then stirred and heated under reflux at a temperature of 60-70°C for 10-16 hours. Hydroxyethyl methacrylate was then added until chloride ions were removed. Finally, the mixture was filtered, the solvent was removed by vacuum distillation, washed and dried to obtain the flame retardant.

[0030] Secondly, this application provides a method for preparing a long-life, energy-saving hydraulic oil, employing the following technical solution:

[0031] A method for preparing a long-life, energy-saving hydraulic oil includes the following steps:

[0032] Step 1: Mix API Group II base oils and esters in a certain proportion for 2-4 hours to form a base mixture for later use;

[0033] Step 2: Raise the temperature of the base mixture to 70-80℃, then add the detergent dispersant, antioxidant, extreme pressure wear-resistant agent, metal deactivator, viscosity index depressant, polymethyl methacrylate pour point depressant, and propylene oxide copolymer demulsifier in sequence. Continue stirring for 2-3 hours until all components are evenly mixed. Finally, cool to room temperature and add defoamer, and continue stirring for 1-2 hours to obtain long-life energy-saving hydraulic oil.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. The long-life energy-saving hydraulic oil of this application adopts various components with high matching degree, which improves the technical defects of unstable base oil quality, extends TOST oxidation time, and takes into account the oil's anti-emulsification performance, hydrolytic stability, storage stability, oxidation resistance and compatibility. At the same time, it obtains a longer thermal stability time, and the oil sample remains clear after the test, with excellent deposit control performance.

[0036] 2. The long-life energy-saving hydraulic oil of this application effectively disperses metal shavings and sludge deposits in the hydraulic oil by adding nano-level cleaning agents, making the oil easy to filter and avoiding the formation of varnish film, while achieving better oil cleanliness and hydraulic system cleanliness.

[0037] 3. The long-life energy-saving hydraulic oil of this application uses a linear polymer viscosity index improver, which improves the defect of unstable oil viscosity, extends the oil service cycle, and obtains better anti-wear and anti-corrosion and anti-rust properties.

[0038] 4. Heptaphenylsilanetriol semisiloxane is a type of polysiloxane flame retardant. Its flame retardant mechanism lies in the formation of an inorganic oxygen-barrier and heat-insulating protective layer containing Si-O bonds or Si-C bonds characteristic of polysiloxane during combustion. Therefore, when heptaphenylsilanetriol semisiloxane is used in combination with hexachlorocyclotriphosphazene, a synergistic flame retardant effect of nitrogen-phosphorus-silicon tri-element will be obtained, thus achieving better flame retardant performance. Detailed Implementation

[0039] The present application will be further described in detail below with reference to Embodiments 1 and 6.

[0040] raw material

[0041] API Group II base oil (Jinan Xinhuihuang Chemical); Dioctyl sebacate (CAS: 2432-87-3); High-base-value petroleum sulfonate calcium (TBN300); Alkyl diphenylamine (T534); Zinc dialkyl dithiophosphate (CAS: 68649-42-3); Polymethyl methacrylate (CAS: 9011-14-7); Methylbenzotriazole (CAS: 13351-73-0); Polyether silicone defoamer (DB-518); Polymethyl methacrylate pour point depressant (Shijiazhuang Donghang Lubricating Oil Additive) Additives; RO-06 demulsifier for propylene oxide copolymers; heptaphenylsilane triol semisiloxane CAS: 444315-26-8; diphenyl chlorophosphate CAS: 2524-64-3; hexachlorocyclotriphosphazene CAS: 940-71-6; hydroxyethyl methacrylate CAS: 97-63-2; tetrahydrofuran CAS: 109-99-9; β-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester CAS: 125643-61-0.

[0042] Example 1

[0043] A long-life, energy-saving hydraulic oil comprises the following raw materials by weight: 93g of API Group II base oil, 3g of ester-dioctyl sebacate, 0.3g of detergent-dispersant-high-alkalinity petroleum sulfonate calcium, 0.3g of antioxidant-alkyl diphenylamine, 0.2g of antioxidant-β-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate isooctyl ester, 0.05g of extreme pressure anti-wear agent-zinc dialkyl dithiophosphate, 0.03g of metal deactivator-methylbenzotriazole, 3g of viscosity index enhancer-polymethyl methacrylate, 0.02g of defoamer-polyether silicone defoamer, 0.2g of polymethyl methacrylate pour point depressant, and 0.02g of propylene oxide copolymer demulsifier.

[0044] The preparation method of long-life energy-saving hydraulic oil includes the following steps:

[0045] Step 1: Mix API Group II base oil and esters in a certain proportion for 3 hours to form a base mixture for later use;

[0046] Step 2: Raise the temperature of the base mixture to 75°C, then add the detergent dispersant, antioxidant, extreme pressure wear-resistant agent, metal deactivator, viscosity index depressant, polymethyl methacrylate pour point depressant, and propylene oxide copolymer demulsifier in sequence. Continue stirring for 3 hours until all components are evenly mixed. Finally, cool to room temperature and add defoamer, and continue stirring for 2 hours to obtain long-life energy-saving hydraulic oil.

[0047] It should be noted that, in this application, the detergent dispersant may be selected from one of the following: high-alkalinity calcium petroleum sulfonate, polyisobutylene succinimide, calcium petroleum sulfonate, succinimide, and succinate.

[0048] The antioxidant can be selected from one of the following: alkyl diphenylamine, 2,6-di-tert-butyl-p-cresol, phenolic ester antioxidants, and alkyl phenyl propionate esters;

[0049] Extreme pressure anti-wear agents can be selected from one of the following: zinc dialkyl dithiophosphate, zinc dialkyl dithiophosphate, alkyl phosphite, phosphate ester, ammonium salt of thiophosphate, borate, and sulfonate.

[0050] The metal deactivating agent can be one of the following: methylbenzotriazole derivative, phosphate ester, imidazole derivative, sulfonate, carboxylic acid derivative, and carboxylic acid ester derivative;

[0051] The adhesive can be one of polymethyl methacrylate, polyisobutylene, and ethylene-propylene copolymer.

[0052] The defoamer can be selected from one of the following: polyether organic defoamer, polysiloxane type defoamer, acrylate copolymer, methacrylate copolymer, polyethylene glycol ether, polybutylene glycol ether, fatty alcohol, alkyl phosphate ester, and composite defoamer;

[0053] Among them, the long-life energy-saving hydraulic oil obtained by each component option in Example 1 has relatively better comprehensive performance, and its specific performance data is shown in Table 1.

[0054] Table 1 Performance data for Example 1

[0055]

[0056]

[0057] Example 2

[0058] The difference from Example 1 is that the long-life energy-saving hydraulic oil also contains 3g of flame retardant, which is hexachlorocyclotriphosphazene.

[0059] Example 3

[0060] The difference from Example 2 is that the flame retardant is a complex of hexachlorocyclotriphosphazene and heptaphenylsilanetriol semisiloxane;

[0061] The preparation method of the complex of hexachlorocyclotriphosphazene and heptaphenylsilanetriol semisiloxane is as follows:

[0062] First, heptaphenylsilanetriol semisiloxane and hexachlorocyclotriphosphazene were added to excess anhydrous tetrahydrofuran in a molar ratio of 1:3. The mixture was then stirred and heated under reflux at 50°C for 8 hours. Finally, the mixture was filtered, the solvent was removed by vacuum distillation, and the product was washed and dried to obtain a complex of hexachlorocyclotriphosphazene and heptaphenylsilanetriol semisiloxane.

[0063] Example 4

[0064] The difference from Example 2 is that the flame retardant is a complex of heptaphenylsilanetriol semisiloxane, diphenyl chlorophosphate and hexachlorocyclotriphosphazene;

[0065] The preparation method of flame retardant includes the following steps:

[0066] Preparation of heptaphenyl alcohol-diphenyl phosphate multifaceted oligomeric semisiloxane:

[0067] First, heptaphenylsilanetriol semisiloxane and diphenyl chlorophosphate were added to excess anhydrous tetrahydrofuran in a molar ratio of 1:2. Then, the mixture was stirred and heated under reflux at 50°C for 8 hours. Finally, the mixture was filtered, the solvent was removed by vacuum distillation, washed and dried to obtain heptaphenylol-diphenyl phosphate polyhedral semisiloxane.

[0068] Preparation of flame retardant: First, heptaphenyl alcohol-diphenyl phosphate polyhedral oligomeric semisiloxane and hexachlorocyclotriphosphazene were added to excess anhydrous tetrahydrofuran in a 1:1 molar ratio. Then, the mixture was stirred and heated to reflux at 65°C for 14 hours. After that, hydroxyethyl methacrylate was added until chloride ions were removed. Finally, the mixture was filtered, the solvent was removed by vacuum distillation, washed and dried to obtain the flame retardant.

[0069] Examples 5-6

[0070] The difference from Example 4 is that the molar ratios of heptaphenylsilanetriol semisiloxane, diphenyl chlorophosphate, and hexachlorocyclotriphosphazene are different, as shown in Table 2.

[0071] Table 2. Molar ratio of each component in the flame retardant of Examples 4-6

[0072] Example 4 Example 5 Example 6 Heptaphenylsilanetriol semisiloxane 1 1 1 diphenyl chlorophosphate 2 1.5 2.5 Hexachlorocyclotriphosphazene 1 1.5 0.5

[0073] The flame retardancy of Examples 1-6 was tested according to MIL-PRF-87257B, and the test data are shown in Table 3.

[0074] Table 3. Flame resistance performance data of Examples 1-6

[0075] Flame propagation speed (cm / s) Flame propagation speed (cm / s) Example 1 0.49 Example 4 0.27 Example 2 0.36 Example 5 0.28 Example 3 0.29 Example 6 0.28

[0076] Referring to Example 1 and Table 1, it can be seen that the long-life energy-saving hydraulic oil of this application uses highly matched extreme pressure anti-wear agents, antioxidants, defoamers, and viscosity index agents, which improves the technical defects of unstable base oil quality, helps to extend the TOST oxidation time to more than 8000 hours, and takes into account the oil's demulsification performance, hydrolytic stability, storage stability, oxidation resistance and compatibility.

[0077] Referring to Examples 1 and 2 and in conjunction with Table 3, it can be seen that the flame propagation speed of Example 2 is significantly reduced compared to Example 1. This indicates that the addition of hexachlorocyclotriphosphazene can significantly improve the flame retardant properties of long-life energy-saving hydraulic oil.

[0078] The reason for this is that hexachlorocyclotriphosphazene is composed of alternating phosphorus and nitrogen atoms, and this conjugated structure gives hexachlorocyclotriphosphazene extremely good thermal stability.

[0079] During combustion, phosphazene polymers undergo thermal decomposition, an endothermic reaction. The phosphate esters, metaphosphates, and polyphosphates produced during this process form a non-volatile protective film, isolating the air. Simultaneously, phosphazene polymers also produce non-flammable ammonia, including NH3, N2, and NO. X These gases can dilute the concentration of combustible gases produced during combustion.

[0080] Referring to Examples 2 and 3 and in conjunction with Table 3, it can be seen that the flame propagation speed of Example 3 is further reduced compared to Example 2. This indicates that the addition of heptaphenylsilanetriol semisiloxane can further improve the flame retardant properties of long-life energy-saving hydraulic oil.

[0081] The reason for this is that the chlorine atom adjacent to the phosphorus atom in hexachlorocyclotriphosphazene is highly reactive. Therefore, when heptaphenylsilane-semi-siloxane is used in combination with hexachlorocyclotriphosphazene, the chloride ion on hexachlorocyclotriphosphazene will undergo a substitution reaction with the hydroxyl group on heptaphenylsilane-semi-siloxane, thereby linking heptaphenylsilane-semi-siloxane with hexachlorocyclotriphosphazene.

[0082] Heptaphenylsilanetriol semisiloxane is a type of polysiloxane flame retardant. Its flame retardant mechanism lies in the formation of an inorganic oxygen-barrier and heat-insulating protective layer containing Si-O bonds or Si-C bonds characteristic of polysiloxane during combustion. Therefore, when heptaphenylsilanetriol semisiloxane is used in combination with hexachlorocyclotriphosphazene, a synergistic flame retardant effect of nitrogen, phosphorus and silicon tri-elements will be obtained, thus achieving better flame retardant performance.

[0083] Referring to Examples 3 and 4 and in conjunction with Table 3, it can be seen that the flame propagation speed in Example 4 is further reduced compared to Example 3. This indicates that the addition of diphenyl chlorophosphate can further improve the flame retardant properties of long-life energy-saving hydraulic oil.

[0084] The reason for this is that although the product of heptaphenylsilanetriol semisiloxane and hexachlorocyclotriphosphazene contains silicon-oxygen bonds, its compatibility in hydraulic oil is still relatively poor. To further improve the compatibility of the flame retardant in hydraulic oil, the applicant considered using esters as the matrix of the flame retardant, specifically choosing diphenyl chlorophosphate. This allows the chlorine atom on diphenyl chlorophosphate to undergo a substitution reaction with the hydroxyl group on heptaphenylsilanetriol semisiloxane, thereby linking heptaphenylsilanetriol semisiloxane, hexachlorocyclotriphosphazene, and diphenyl chlorophosphate. Furthermore, to avoid the influence of excess chlorine atoms on hexachlorocyclotriphosphazene, the applicant used hydroxyethyl methacrylate to replace the chlorine atoms, achieving a relatively better flame retardant effect.

[0085] Referring to Examples 4-6 and Table 3, it can be seen that the flame propagation speed in Examples 5-6 is slightly faster than that in Example 4. This indicates that when heptaphenylsilane, diphenyl chlorophosphate, and hexachlorocyclotriphosphazene are used in the molar ratio of Example 4, the resulting flame retardant can promote the long-life energy-saving hydraulic oil to have a better flame-retardant effect.

[0086] 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 long-life energy-saving hydraulic oil, characterized by, The long-life energy-saving hydraulic oil comprises the following raw materials in mass parts: API Class II base oil 90-95 parts, ester 2-4 parts, detergent dispersant 0.2-0.4 parts, antioxidant 0.2-0.4 parts, extreme pressure anti-wear agent 0.04-0.06 parts, metal deactivator 0.02-0.04 parts, tackifier 2-4 parts, defoaming agent 0.01-0.03 parts, polymethyl methacrylate pour point depressant 0.1-0.3 parts and propylene oxide copolymer demulsifier 0.01-0.03 parts; The long-life energy-saving hydraulic oil further comprises 2-4 parts of a flame retardant, and the flame retardant is a nitrogen-silicon hybrid phosphate ester flame retardant; The flame retardant is obtained by a coordination reaction of heptaphenylsilanetriol oligosiloxane, diphenyl chlorophosphate and hexachlorocyclotriphosphazene; The preparation method of the flame retardant is as follows: First, heptaphenylsilanetriol oligosiloxane is condensed with diphenyl chlorophosphate to obtain heptaphenyl alcohol-diphenyl phosphate polyhedral oligomeric silsesquioxane; then, the heptaphenyl alcohol-diphenyl phosphate polyhedral oligomeric silsesquioxane is condensed with hexachlorocyclotriphosphazene to obtain heptaphenyl cyclotriphosphazene-diphenyl phosphate polyhedral oligomeric silsesquioxane; finally, hydroxyethyl methacrylate is added until the chlorine ions are removed, and finally the flame retardant is obtained.

2. The long-life energy-saving hydraulic oil according to claim 1, wherein: The detergent dispersant is one of sulfated alkyl phenol calcium, polyisobutylene succinimide, petroleum sulfonic acid calcium, succinimide and succinate; And / or; The antioxidant is one of alkyl diphenylamine, 2.6-di-tert-butyl-p-cresol, phenolic ester antioxidant and alkyl phenyl propionate; And / or; The extreme pressure anti-wear agent is one of zinc dialkyldithiophosphate, zinc dialkyldithiophosphate, alkyl phosphite, phosphate ester, ammonium salt of thiophosphate, borate and sulfonate; And / or; The metal deactivator is one of methyl benzotriazole derivative, phosphate ester, imidazole derivative, sulfonate, carboxylic acid derivative and carboxylic acid ester derivative; And / or; The tackifier is one of polymethyl methacrylate, polyisobutylene and ethylene-propylene copolymer; And / or; The defoaming agent is one of polyether organic defoaming agent, polysiloxane type defoaming agent, acrylate copolymer, polyethylene glycol ether, polybutylene glycol ether, fatty alcohol, alkyl phosphate ester and composite defoaming agent.

3. The long-life, energy-efficient hydraulic oil of claim 2, wherein, The long-life energy-saving hydraulic oil comprises the following raw materials in mass parts: API Class II base oil 90-95 parts, ester 2-4 parts, detergent dispersant 0.2-0.4 parts, antioxidant 0.2-0.4 parts, extreme pressure anti-wear agent 0.04-0.06 parts, metal deactivator 0.02-0.04 parts, tackifier 2-4 parts, defoaming agent 0.01-0.03 parts, polymethyl methacrylate pour point depressant 0.1-0.3 parts and propylene oxide copolymer demulsifier 0.01-0.03 parts.

4. The long-life, energy-efficient hydraulic oil of claim 1, wherein, The preparation method of the heptaphenyl alcohol-diphenyl phosphate polyhedral oligomeric silsesquioxane is as follows: Firstly, heptaphenyl alcohol-phosphonate diphenyl oligomeric silsesquioxane is added to excess anhydrous tetrahydrofuran in a molar ratio of 1: (1.5-2.5), then the mixture is heated to reflux under stirring, the heating temperature is 40-60℃, the reflux time is 6-10h, finally, the mixture is filtered, the solvent is removed by distillation under reduced pressure, and the product is washed and dried to obtain heptaphenyl alcohol-phosphonate diphenyl oligomeric silsesquioxane.

5. The long-life, energy-efficient hydraulic oil of claim 4, wherein, The preparation method of the flame retardant is: Firstly, heptaphenyl alcohol-phosphonate diphenyl oligomeric silsesquioxane is added to excess anhydrous tetrahydrofuran in a molar ratio of 1: (0.5-1.5), then the mixture is heated to reflux under stirring, the heating temperature is 60-70℃, the reflux time is 10-16h, then hydroxyethyl methacrylate is added until the chloride ion is removed, finally, the mixture is filtered, the solvent is removed by distillation under reduced pressure, and the product is washed and dried to obtain the flame retardant.

6. A method for preparing the long-life energy-saving hydraulic oil according to any one of claims 1 to 5, characterized by, The method comprises the following steps: Step one, API Class II base oil and ester are mixed in proportion for 2-4h to form a base mixed oil for standby; Step two, the temperature of the base mixed liquid is raised to 70-80℃, then the detergent dispersant, antioxidant, extreme pressure wear-resistant agent, metal deactivator, tackifier, polymethyl methacrylate pour point depressant and propylene oxide copolymer demulsifier are added in sequence, the mixture is continuously stirred for 2-3h until the components are uniformly mixed, then the temperature is lowered to room temperature, the defoaming agent is added, and the mixture is continuously stirred for 1-2h to obtain long-life energy-saving hydraulic oil.

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