Hydraulic oil as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of mechanical engineering, and discloses hydraulic oil as well as a preparation method and application thereof. The hydraulic oil provided by the invention comprises the following components in parts by weight: 875-1100 parts of composite base oil, 1-4 parts of a composite antioxidant and 0.01-7.2 parts of an additive, the composite base oil comprises regenerated base oil and mineral base oil in a mass ratio of 1: (1.75-4); the composite antioxidant is prepared from N-phenyl-a naphthylamine, 2, 6-butylated hydroxytoluene and a benzotriazole derivative according to the mass ratio of 1 to (0.5 to 2) to (0.5 to 1). The hydraulic oil disclosed by the invention has excellent lubricating property, anti-foaming property, oxidation stability and corrosion resistance, can meet the use requirements of a hydraulic system under various complex working conditions, and provides reliable guarantee for normal operation of hydraulic equipment.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical engineering and discloses hydraulic oil, a preparation method and application thereof. Background Art

[0002] Hydraulic oil, the "blood" of the hydraulic system, performs multiple functions, including energy transmission, lubrication and friction reduction, heat dissipation and cooling, gap sealing, corrosion and rust prevention, noise reduction, efficiency improvement, and system cleanliness. In the complex operating conditions of hydraulic systems, it not only ensures efficient and accurate power transmission but also forms a lubricating film between high-speed components to reduce frictional losses, while also removing heat generated by the system and maintaining a stable operating temperature. Furthermore, hydraulic oil must fill gaps between components to prevent internal leakage, resist erosion by external corrosive substances, and maintain internal system cleanliness. Its performance directly determines the operating efficiency, reliability, and service life of the hydraulic system.

[0003] However, existing hydraulic oils generally have the following shortcomings: (1) Insufficient antioxidant stability: Traditional hydraulic oils will retain certain impurities during the refining process. These impurities will catalyze oxidation reactions under high temperature and high pressure conditions, causing the oil to quickly generate acidic substances and sludge. This will not only cause abnormal fluctuations in oil viscosity and affect the normal operation of the hydraulic system, but may also cause corrosion to hydraulic components and even cause filter blockage, shortening the system life; (2) Unbalanced environmental performance: Although traditional hydraulic oils have certain advantages in resource recycling, in order to make up for their performance shortcomings, antioxidants and extreme pressure agents containing compounds such as sulfur, phosphorus, and chlorine are usually required to be added. Once the equipment leaks, these compounds will pollute the soil and water, which does not meet environmental protection requirements; (3) Limited biodegradability: The molecular structure stability of traditional hydraulic oils is relatively poor. In order to inhibit oxidative degradation, it is usually necessary to introduce polymer synthetic additives. However, the introduction of these additives will reduce the overall biodegradation rate of the oil, making it difficult for the hydraulic oil to degrade naturally after being discarded, causing long-term pollution to the environment; (4) Material compatibility risk: The oxidation byproducts and additive decomposition products of traditional hydraulic oils will cause swelling and aging of the seals in the hydraulic system, especially for commonly used hydraulic sealing materials such as nitrile rubber and polyurethane. This incompatibility will cause the seals to fail and cause leakage problems, thereby affecting the normal operation and safety of the hydraulic system.

[0004] Therefore, it is urgent to develop a new generation of hydraulic oil with high oxidation stability, low ecotoxicity, biodegradability and wide material compatibility to meet the demand for high-performance hydraulic oil in fields such as mechanical engineering and provide strong support for the sustainable development of industry. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a hydraulic oil and a preparation method and application thereof.

[0006] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a hydraulic oil, comprising the following components in parts by weight: 875-1100 parts of a composite base oil, 1-4 parts of a composite antioxidant, and 0.01-7.2 parts of an additive; the composite base oil comprises recycled base oil and mineral base oil in a mass ratio of 1:(1.75-4); the composite antioxidant comprises N-phenyl-a naphthylamine, 2,6-di-tert-butyl-p-cresol, and benzotriazole derivative in a mass ratio of 1:(0.5-2):(0.5-1).

[0008] The present application obtains a hydraulic oil with excellent lubricating performance, anti-foaming performance, oxidation stability, and corrosion resistance by compounding the specific components of the composite base oil, the composite antioxidant, and the additive, which can meet the use requirements of the hydraulic system under various complex working conditions and provide reliable protection for the normal operation of the hydraulic equipment. In the present application, the composite base oil system in the hydraulic oil is compounded by the recycled base oil and the mineral base oil. The recycled base oil has good lubricating properties, and the mineral base oil has stable chemical properties and appropriate viscosity properties. The two components synergistically act to form a uniform and persistent lubricating oil film, effectively isolate the moving parts, and reduce direct contact and friction. At the same time, the two components can, together with other components, on the one hand, inhibit the acidic substances generated by the oxidation of the oil, reduce the corrosion of the acidic substances to the metal, enhance the protective ability of the metal surface, prevent the erosion of water and oxygen to the metal, protect the metal parts in the hydraulic system from corrosion, ensure the long-term stable operation of the system, and improve the reliability and safety of the equipment; on the other hand, reduce the surface tension of the oil, maintain the chemical stability of the oil, prevent the formation and accumulation of foam, ensure the stable pressure of the hydraulic system, and improve the reliability and working efficiency of the system. The composite antioxidant in the present application can inhibit the oxidation reaction of the oil from multiple ways such as terminating the oxidation chain reaction and inhibiting the catalytic effect of the metal on the oxidation of the oil, improve the oxidation stability of the hydraulic oil, make it maintain stable performance for a long time in a high-temperature environment, prolong the service life, reduce the oil change frequency, and reduce the equipment maintenance cost; and can further improve the anti-foaming performance and corrosion resistance of the hydraulic oil together with other components, ensure that the hydraulic system maintains a high-efficiency and stable working state during a long-time operation, reduce energy consumption, and prolong the equipment maintenance cycle and service life.

[0009] As a preferred embodiment of the hydraulic oil of the present application, the mass ratio of the recycled base oil to the mineral base oil is 1:(1.75-4).

[0010] Preferably, the mass ratio of the recycled base oil to the mineral base oil is 1:(2-2.8).

[0011] As a preferred embodiment of the hydraulic oil of the present invention, the mass ratio of N-phenyl-a-naphthylamine, 2,6-di-tert-butyl-p-cresol and benzotriazole derivative is 1:(0.75-1.5):(0.6-0.75).

[0012] As a preferred embodiment of the hydraulic oil of the present invention, the additive includes the following components in parts by weight: 1-5 parts of anticorrosive agent, 0.5-1 parts of rust inhibitor, 0.1-0.9 parts of pour point depressant, 0.01-0.1 parts of antifoaming agent and 0.05-0.2 parts of demulsifier.

[0013] Preferably, the regenerated base oil comprises 150SN regenerated base oil.

[0014] Preferably, the mineral base oil includes 100# mineral base oil.

[0015] Preferably, the corrosion inhibitor includes at least one of zinc dialkylthiophosphate, zinc octylthiophosphate, and primary and secondary alkyl zincthiophosphate.

[0016] Preferably, the rust inhibitor includes at least one of alkenyl succinate, dodecenyl succinic acid, and benzotriazole.

[0017] Preferably, the pour point depressant includes at least one of polymethacrylate and polyisobutylene.

[0018] Preferably, the anti-foaming agent includes diethyl silicone oil and / or acrylate.

[0019] Preferably, the demulsifier includes condensates of amines and epoxides, propylene oxide diamine condensates, polymer polyethers and modified polymer polyethers.

[0020] In a second aspect, the present invention provides a method for preparing the hydraulic oil, comprising the following steps: uniformly mixing the composite base oil, composite antioxidant, and additives to obtain the hydraulic oil.

[0021] As a preferred embodiment of the preparation method of the present invention, the mixing temperature is 40°C-50°C.

[0022] Preferably, the mixing time is 30 min-45 min.

[0023] In a third aspect, the present invention provides the use of the hydraulic oil in industrial equipment, agricultural equipment, and transportation equipment.

[0024] Compared with the prior art, the hydraulic oil has the following advantages: (1) the hydraulic oil has excellent lubricating performance, which can form a uniform and durable lubricating oil film, effectively isolate moving parts, reduce direct contact and friction, ensure that the hydraulic system maintains high efficiency and stable working state during long-time operation, reduces energy consumption, prolongs equipment maintenance period and service life; (2) the hydraulic oil has excellent anti-foaming performance, which can prevent the formation and accumulation of foam, ensure the stability of the hydraulic system pressure, and improve the reliability and working efficiency of the system; (3) the hydraulic oil has excellent oxidation stability, which can inhibit the oxidation reaction of the oil from multiple pathways, maintain stable performance for a long time in a high-temperature environment, prolong the service life, reduce the oil change frequency, and reduce the equipment maintenance cost; (4) the hydraulic oil has excellent corrosion resistance, which can chemically react with the metal surface to form a dense protective film, prevent water, oxygen and corrosive media from contacting the metal surface, protect the metal parts in the hydraulic system from corrosion, ensure the long-term stable operation of the system, and improve the reliability and safety of the equipment; (5) the hydraulic oil realizes the synergistic optimization of lubrication, anti-foaming, corrosion resistance, oxidation stability, environmental protection and other functions by compounding multiple components, which can meet the use requirements of the hydraulic system under various complex working conditions, and provides reliable protection for the normal operation of the hydraulic equipment. DETAILED DESCRIPTION

[0025] In order to better illustrate the purpose, technical scheme and advantages of the present application, the present application will be further described below in combination with specific examples. Those skilled in the art should understand that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0026] The following specific examples are described to illustrate the actual effect of the present application scheme.

[0027] The test methods used in the examples are conventional methods unless otherwise specified; the materials, reagents, equipment, etc. used are commercially available unless otherwise specified.

[0028] The raw materials used in the following examples and comparative examples are described as follows, but are not limited to these materials:

[0029] Table 1: Raw materials and manufacturers

[0030]

[0031]

[0032] In the following examples and comparative examples, the preparation method of the hydraulic oil involves the following steps:

[0033] The composite base oil, corrosion inhibitor, anti-rust agent, composite antioxidant, pour point depressant, antifoaming agent, demulsifier are mixed, heated to 45℃, stirred for 40 min, reduced to room temperature, filtered to obtain long-acting environment-friendly hydraulic oil.

[0034] The raw materials of the hydraulic oil of the following examples and comparative examples (by weight fraction) are shown in Table 2 and Table 3.

[0035] Table 2: Raw material ratio of the hydraulic oil of the examples of the present application (weight fraction)

[0036]

[0037] Table 3: Raw material ratio of the hydraulic oil of the comparative examples of the present application (weight fraction)

[0038]

[0039]

[0040] Test example: performance test of hydraulic oil

[0041] The hydraulic oil obtained in the above examples and comparative examples is subjected to performance test.

[0042] (1) Viscosity test: test the kinematic viscosity of the hydraulic oil at 40℃ according to GB / T 265.

[0043] (2) Air release value test: test the air release value of the hydraulic oil at 50℃ according to SH / T 0308.

[0044] (3) Oxidation stability test: test the rotary oxygen bomb of the hydraulic oil at 150℃ according to SH / T 0193.

[0045] (4) Corrosion resistance test: test the corrosion resistance of the hydraulic oil according to GB / T 5096.

[0046] Table 4: Performance test results of the hydraulic oil of the examples and comparative examples

[0047]

[0048]

[0049] From the data in Table 4, it can be seen that the hydraulic oil prepared by the embodiment of the present application with specific content of components has excellent lubricating performance, can form a uniform and persistent lubricating oil film, effectively isolate moving parts, reduce direct contact and friction, ensure that the hydraulic system maintains a high-efficiency and stable working state during long-time operation, reduces energy consumption, prolongs equipment maintenance cycle and service life; secondly, the hydraulic oil of the present application can quickly release the mixed air when tested for air release value at 50℃ (according to SH / T0308 standard), exhibits excellent anti-foam performance, ensures stable pressure of the hydraulic system, improves the reliability and working efficiency of the system; at the same time, the hydraulic oil of the present application exhibits a long oxidation induction period in the rotary oxygen bomb test at 150℃ (according to SH / T0193 standard), can maintain stable performance for a long time in a high-temperature environment, prolongs the service life of the hydraulic oil, reduces the oil change frequency, and reduces the equipment maintenance cost; in addition, in the corrosion performance test under GB / T 5096 standard, the copper sheet corrosion level of the hydraulic oil of the present application is low, which exhibits excellent anti-corrosion performance, can protect the metal parts in the hydraulic system from corrosion, ensures long-term stable operation of the system, and improves the reliability and safety of the equipment. As can be seen, the hydraulic oil of the present application realizes the synergistic optimization of lubrication, anti-foam, anti-corrosion, oxidation stability, environmental protection and other functions by compounding multiple components, can meet the use requirements of the hydraulic system under various complex working conditions, and provides reliable protection for the normal operation of the hydraulic equipment.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A hydraulic oil, characterized in that: The invention comprises the following components in parts by weight: 875-1100 parts of composite base oil, 1-4 parts of composite antioxidant, and 0.01-7.2 parts of additives; the composite base oil comprises recycled base oil and mineral base oil in a mass ratio of 1:(1.75-4); the composite antioxidant comprises N-phenyl-a-naphthylamine, 2,6-di-tert-butyl-p-cresol, and a benzotriazole derivative in a mass ratio of 1:(0.5-2):(0.5-1).

2. The hydraulic oil according to claim 1, wherein The mass ratio of the N-phenyl-a-naphthylamine, 2,6-di-tert-butyl-p-cresol and the benzotriazole derivative is 1:(0.75-1.5):(0.6-0.75).

3. The hydraulic oil according to claim 1, wherein The mass ratio of the regenerated base oil to the mineral base oil is 1:(2-2.8).

4. The hydraulic oil according to claim 1, wherein The additive comprises the following components in parts by weight: 1-5 parts of an anticorrosive agent, 0.5-1 parts of a rust inhibitor, 0.1-0.9 parts of a pour point depressant, 0.01-0.1 parts of an antifoaming agent and 0.05-0.2 parts of a demulsifier.

5. The hydraulic oil according to claim 4, characterized in that The corrosion inhibitor includes at least one of zinc dialkylthiophosphate, zinc octylthiophosphate, and zinc primary and secondary alkylthiophosphate.

6. The hydraulic oil according to claim 4, wherein The rust inhibitor includes at least one of alkenyl succinate, dodecenyl succinic acid, and benzotriazole.

7. The hydraulic oil according to claim 4, wherein: The anti-foaming agent includes diethyl silicone oil and / or acrylate.

8. The method for preparing the hydraulic oil according to any one of claims 1 to 7, characterized in that: The following steps are involved: The composite base oil, composite antioxidant and additives are uniformly mixed to obtain the hydraulic oil.

9. The preparation method according to claim 8, wherein The mixing temperature is 40°C-50°C.

10. Use of the hydraulic oil according to any one of claims 1 to 7 in industrial equipment, agricultural equipment, and transportation equipment.

Images