A high-pressure and long-life hydraulic oil for engineering machinery and a preparation method thereof

Abstract

The invention discloses a high-pressure long-life engineering machinery hydraulic oil and a preparation method thereof, belonging to the technical field of engineering machinery hydraulic oil, and its composition includes, by mass percentage: antiwear agent 0.3%-0.5%, antioxidant 0.2%-0.40%, rust inhibitor 0.10%-0.20%, metal deactivator 0.01%-0.03%, friction reducer 0.1%-0.2%, pour point depressant: 0.1-0.15%, defoamer 0.01%-0.02%, demulsifier: 0.0002-0.0003%, and the balance is base oil. The composite antiwear agent selected by the present invention is coordinated with the dialkyl dithiocarbamate molybdenum friction reducer, which can protect the hydraulic system parts from wear, extend the service life of hydraulic equipment, and achieve energy-saving effect. The formula of the present invention does not contain zinc element, which is an ashless engineering machinery hydraulic oil, does not corrode copper and silver parts, is more suitable for hydraulic parts with copper or silver, reduces the occurrence of failures, and extends the service life of oil products.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery hydraulic oil, and more specifically to high-pressure, long-life, ash-free engineering machinery hydraulic oil and a preparation method thereof. Background Art

[0002] A typical hydraulic system consists of five parts, namely power components, actuators, control components, auxiliary components and hydraulic oil. On the one hand, the role of hydraulic oil is to realize the working medium of energy transmission, conversion and control. On the other hand, hydraulic oil can lubricate equipment, reduce friction and wear of hydraulic system; prevent rust and corrosion; seal some gaps in hydraulic equipment; take away the heat generated by friction, stirring and compression, cool hydraulic components; flush away metal powder, sealing material powder, sludge and other pollutants generated by wear and corrosion from hydraulic components to avoid increasing wear of hydraulic components and clogging small holes and gaps of hydraulic components.

[0003] Compared with the hydraulic systems of general industrial equipment, construction machinery equipment is mostly operated in the field, and the working environment changes greatly. The hydraulic system of construction machinery is developing in the direction of gradually increasing pressure, smaller oil tanks, and using precise hydraulic components. This puts higher requirements on the viscosity-temperature property, wear resistance, oxidation stability, air release, oil-water separation and other properties of the hydraulic oil of construction machinery, and hopes that the oil has a longer oil change cycle.

[0004] Therefore, how to provide an engineering machinery hydraulic oil that can be used in a high-pressure, low-temperature environment, has excellent anti-wear and anti-emulsification properties, and has a longer service life is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The fourth object of the present invention is to use coal-based Class III + base oil and esters as base oils. Coal-based Class III + base oils have a very high viscosity index of more than 140, excellent viscosity-temperature performance, good low-temperature flow performance, and excellent oxidation stability to reduce the risk of engineering machinery hydraulic oil producing sludge at high temperatures. At the same time, diesters and saturated polyol esters have a high viscosity index, which improves the oil's ability to dissolve additives, and has a friction-reducing effect on metal adhesion, and has excellent low-temperature performance and good hydrolysis stability. The base oils contained in the present invention all have a very high viscosity index, excellent viscosity-temperature performance and shear stability, which avoids the addition of a high molecular weight viscosity index improver in the formula, which leads to the shearing and chain breaking of the oil macromolecular compounds during long-term use, the viscosity becomes smaller, the hydraulic system oil pressure is reduced, the wear increases, and the sealing becomes worse, and the lubrication and anti-wear properties of the oil can be maintained under ultra-long operation time. The formula of the present invention does not contain zinc element and is an ashless engineering machinery hydraulic oil. It will not corrode copper and silver parts, is more suitable for hydraulic parts with copper or silver, reduces the occurrence of failures, and prolongs the service life of the oil.

[0006] The technical scheme of the present invention is: a high-pressure long-life engineering machinery hydraulic oil and a preparation method thereof, which comprises, by mass percentage, 0.3% to 0.5% anti-wear agent, 0.2% to 0.40% antioxidant, 0.10% to 0.20% rust inhibitor, 0.01% to 0.03% metal deactivator, 0.1% to 0.2% friction reducer, 0.1% to 0.2% pour point depressant: 0.1-0.15%, defoamer 0.01% to 0.02%, demulsifier: 0.0002-0.0003%, and the balance is base oil; the base oil is any three or four of coal-based Class III + CTL6 base oil, coal-based Class III + CTL10 base oil, diester DA51 and saturated polyol ester SparkPOE 305. The VI of the coal-based Class III + base oil is ≥140, and the pour point is ≤-30°C.

[0007] The anti-wear agent is a composite anti-wear agent, which includes 30 parts of dithiophosphate, 30 parts of dibutyl phosphite, and 40 parts of dibutyl dithiocarbamate. The composite anti-wear agent can form a protective film on the metal surface of the hydraulic system of engineering machinery, reduce the wear of hydraulic components, and extend the service life of hydraulic equipment.

[0008] The antioxidant is a composite antioxidant, which includes 15 parts of 2,2-dithiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxybenzene)acrylate], 35 parts of 2,6-di-tert-butyl-p-cresol, and 50 parts of diisooctyldiphenylamine. The composite antioxidant can provide excellent antioxidant performance and thermal stability in the whole temperature range of medium and low temperatures and high temperatures, effectively control the generation of acidic substances and sludge, and extend the service life of hydraulic oil of construction machinery.

[0009] The rust inhibitor is dodecenylsuccinic acid half ester or phosphate ester.

[0010] The metal deactivator is N'N-di-n-butylaminobenzotriazole or benzotriazole octadecylamine salt.

[0011] The friction reducer is molybdenum dialkyl dithiocarbamate; the friction reducer can form a chemical reaction lubricating film on the friction surface, transforming the movement mode of the friction surface of the metal parts of the hydraulic system from sliding friction to rolling friction, greatly reducing the friction coefficient and significantly improving the extreme pressure performance.

[0012] The defoamer is polyacrylate; the polyacrylate defoamer has a more durable defoaming ability and excellent solubility in oil products than the silicon-type defoamer, and has little effect on the air release performance of the hydraulic oil of the construction machinery.

[0013] The pour point depressant is a polymethacrylate pour point depressant or a fumarate pour point depressant;

[0014] The demulsifier is a polyether polymer compound or a condensate of amine and ethylene oxide.

[0015] The present invention provides a method for preparing the above-mentioned high-pressure and long-life hydraulic oil for engineering machinery, and the specific steps thereof include:

[0016] Step 1, preparing a composite anti-wear agent: 30 parts of dithiophosphate, 30 parts of di-n-butyl phosphite, and 40 parts of dibutyl dithiocarbamate are mixed, heated to 50-60° C., and stirred at a speed of 800-1200 r / min for 10-20 min using a mechanical stirrer to obtain a composite anti-wear agent;

[0017] Step 2, prepare high-pressure and long-life engineering machinery hydraulic oil: weigh the materials in the formula, add the composite anti-wear agent, friction reducer and composite antioxidant to the base oil in turn, and stir at a speed of 1000-1500r / min at a heating condition of 70-80°C in the reactor until it is uniform and transparent, and then add the rust inhibitor, metal deactivator, pour point depressant, demulsifier and defoamer in turn, and stir at normal pressure for 1.5h-2h at a heating condition of 60°C-80°C. After passing the inspection, cool to room temperature and filter to obtain the high-pressure and long-life engineering machinery hydraulic oil.

[0018] The beneficial effects of the present invention are as follows: the hydraulic oil of construction machinery can maintain good flow properties at low temperatures, have stable viscosity at high temperatures, maintain good shear stability and excellent anti-oxidation properties; in the case of excessively high water content, it has excellent anti-emulsification properties, can quickly separate from water and continuously maintain the lubrication and safety of the hydraulic system; effectively control the generation of acidic substances and sludge in the oil, and extend the service life of the hydraulic oil of construction machinery. At the same time, it provides excellent anti-wear and friction reduction properties, prevents wear of hydraulic system components, has energy-saving effects, and meets the safe and stable operation of hydraulic systems containing copper and silver components under harsh working conditions, high loads, long oil change cycles and other working conditions. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the following embodiments, the high-pressure and long-life engineering machinery hydraulic oil is prepared by the following preparation method, the specific steps of which include:

[0021] Step 1, preparing a composite anti-wear agent: 30 parts of dithiophosphate, 30 parts of di-n-butyl phosphite, and 40 parts of dibutyl dithiocarbamate are mixed, heated to 50-60° C., and stirred at a speed of 800-1200 r / min for 10-20 min using a mechanical stirrer to obtain a composite anti-wear agent;

[0022] Step 2, prepare high-pressure and long-life engineering machinery hydraulic oil: weigh the materials in the formula, add the composite anti-wear agent, friction reducer and composite antioxidant to the base oil in turn, and stir at a speed of 1000-1500r / min at a heating condition of 70-80°C in the reactor until it is uniform and transparent, and then add the rust inhibitor, metal deactivator, pour point depressant, demulsifier and defoamer in turn, and stir at normal pressure for 1.5h-2h at a heating condition of 60°C-80°C. After passing the inspection, cool to room temperature and filter to obtain the high-pressure and long-life engineering machinery hydraulic oil.

[0023] Example 1

[0024]

[0025]

[0026] Composite antiwear agent, friction reducer and composite antioxidant are added in sequence to base oils based on 43.4% coal-based Class III + CTL6, 20% coal-based Class III + CTL10 and 35.68% polyol ester SparkPOE305. Under heating conditions at 70-80°C, the reactor is stirred at a speed of 1000-1500r / min until the mixture is uniform and transparent. Then, rust inhibitor, metal deactivator, pour point depressant, demulsifier and defoaming agent are added in sequence. Under heating conditions at 60-80°C, the mixture is stirred at normal pressure for 1.5-2h. After passing the inspection, the mixture is cooled to room temperature and filtered to obtain high-pressure and long-life engineering machinery hydraulic oil.

[0027] Example 2

[0028]

[0029]

[0030] Composite anti-wear agent, friction reducer and composite antioxidant are added in sequence to base oils based on 43.4% coal-based Class III + CTL6, 40.38% coal-based Class III + CTL10 and 20% polyol ester SparkPOE305. Under heating conditions at 70-80°C, the reactor is stirred at a speed of 1000-1500r / min until the mixture is uniform and transparent. Then, rust inhibitor, metal deactivator, pour point depressant, demulsifier and defoaming agent are added in sequence. Under heating conditions at 60-80°C, the mixture is stirred at normal pressure for 1.5-2h. After passing the inspection, the mixture is cooled to room temperature and filtered to obtain high-pressure and long-life engineering machinery hydraulic oil.

[0031] Example 3

[0032]

[0033] Composite anti-wear agent, friction reducer and composite antioxidant are added in sequence to base oils based on 32.45% coal-based Class III + CTL6, 55% coal-based Class III + CTL10 and 30% diester DA51. Under heating conditions at 70-80°C, the reactor is stirred at a speed of 1000-1500r / min until the oil is uniform and transparent. Then, rust inhibitor, metal deactivator, pour point depressant, demulsifier and defoaming agent are added in sequence. Under heating conditions at 60-80°C, the oil is stirred at normal pressure for 1.5-2h. After passing the inspection, the oil is cooled to room temperature and filtered to obtain high-pressure and long-life engineering machinery hydraulic oil.

[0034] Example 4

[0035]

[0036] Composite antiwear agent, friction reducer and composite antioxidant are added in sequence to base oils based on 28.59% coal-based Class III + CTL6, 55% coal-based Class III + CTL10 and 15% diester DA51. Under heating conditions at 70-80°C, the reactor is stirred at a speed of 1000-1500r / min until the oil is uniform and transparent. Then, rust inhibitor, metal deactivator, pour point depressant, demulsifier and defoaming agent are added in sequence. Under heating conditions at 60-80°C, the oil is stirred at normal pressure for 1.5-2h. After passing the inspection, the oil is cooled to room temperature and filtered to obtain high-pressure and long-life engineering machinery hydraulic oil.

[0037] Comparative Example 1

[0038] It is a well-known domestic brand of engineering machinery hydraulic oil A sold on the market.

[0039] Comparative Example 2

[0040] It is a well-known domestic brand of engineering machinery hydraulic oil B sold on the market.

[0041] The data comparison of Examples 1 to 4 and Comparative Examples 1 to 2 is shown in Table 2.

[0042] Table 2 Comparison of hydraulic oil testing between the product of the present invention and domestic brand engineering machinery

[0043]

[0044]

[0045] It can be seen from the above data that: 1) The viscosity index of the embodiment of the present invention is higher than that of comparative examples 1 and 2. The hydraulic system can still maintain a high viscosity under high temperature conditions, provide sufficient lubrication performance, and the operating performance of the hydraulic system is more stable. 2) The pour point of the embodiment of the present invention is lower than that of comparative examples 1 and 2, and has excellent low-temperature flow performance, which can well adapt to the low-temperature environment of field operations of engineering machinery. 3) The rotating oxygen bomb test time of the embodiment of the present invention is much longer than that of comparative examples 1 and 2, and has excellent antioxidant properties, which can ensure that the hydraulic oil of engineering machinery has a long life oil change cycle. 4) The wear spot diameter of the embodiment of the present invention is smaller than that of comparative examples 1 and 2, and has excellent anti-wear performance, which can protect the parts of the hydraulic system from wear and extend the service life of the hydraulic equipment. 5) The friction coefficient of the embodiment of the present invention is lower than that of comparative examples 1 and 2, and has excellent friction reduction ability. In the process of energy transmission and conversion of hydraulic oil, the hydraulic equipment runs more smoothly and is more energy-saving. 6) The shear stability of the embodiment of the present invention is low, which can ensure that the oil product still has good viscosity retention after long-term operation and shearing of the hydraulic equipment, avoiding excessive viscosity resulting in increased internal leakage of the hydraulic system and reduced working efficiency of the oil pump.

[0046] In summary, the technical solution of this application has the best comprehensive effect, which can not only ensure the relevant excellent properties of anti-oxidation, anti-wear and anti-friction, but also achieve better stability, low-temperature fluidity and shear stability!

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure and long-life hydraulic oil for engineering machinery, characterized in that: The composition includes, by mass percentage, 0.3% to 0.5% anti-wear agent, 0.2% to 0.40% antioxidant, 0.10% to 0.20% rust inhibitor, 0.01% to 0.03% metal deactivator, 0.1% to 0.2% friction reducer, 0.1% to 0.15% pour point depressant, 0.01% to 0.02% defoamer, 0.0002-0.0003% demulsifier, and the balance is base oil; the base oil is any three or four of coal-based Class III + CTL6 base oil, coal-based Class III + CTL10 base oil, diester DA51 and saturated polyol ester SparkPOE305, wherein the VI of the coal-based Class III + base oil is ≥140 and the pour point is ≤-30°C; The anti-wear agent is a composite anti-wear agent, which includes 30 parts of dithiophosphate, 30 parts of di-n-butyl phosphite, and 40 parts of dibutyl dithiocarbamate; The antioxidant is a composite antioxidant, which includes 15 parts of 2,2-dithiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxybenzene)acrylate], 35 parts of 2,6-di-tert-butyl-p-cresol, and 50 parts of diisooctyl diphenylamine; The rust inhibitor is dodecenyl succinic acid half ester or phosphate, and the metal deactivator is N'N-di-n-butylaminobenzotriazole or benzotriazole octadecylamine salt; The friction reducer is molybdenum dialkyl dithiocarbamate; the defoamer is polyacrylate; the pour point depressant is polymethacrylate pour point depressant or fumarate pour point depressant; and the demulsifier is a polyether polymer compound or a condensate of amine and ethylene oxide.

2. The method for preparing a high-pressure and long-life hydraulic oil for engineering machinery according to claim 1, characterized in that: The specific steps include: Step 1, preparing a composite anti-wear agent: 30 parts of dithiophosphate, 30 parts of di-n-butyl phosphite, and 40 parts of dibutyl dithiocarbamate are mixed, heated to 50-60° C., and stirred at a speed of 800-1200 r / min for 10-20 min using a mechanical stirrer to obtain a composite anti-wear agent; Step 2, prepare high-pressure long-life engineering machinery hydraulic oil: weigh the materials in the formula, add the composite anti-wear agent, friction reducer and composite antioxidant to the base oil in turn, and stir at a speed of 1000-1500r / min at a heating condition of 70-80°C in the reactor until it is uniform and transparent, and then add the rust inhibitor, metal deactivator, pour point depressant, demulsifier and defoamer in turn, and stir at normal pressure for 1.5h-3h at a heating condition of 50°C-70°C. After passing the inspection, cool to room temperature and filter to obtain the high-pressure long-life engineering machinery hydraulic oil.

Images