Environment-friendly long-life hydraulic oil and preparation method thereof

Abstract

The invention discloses environment-friendly long-service-life hydraulic oil and a preparation method thereof, and belongs to the technical field of hydraulic oil, and the key point of the technical scheme is that the hydraulic oil comprises the following raw materials in parts by weight: 70-85 parts of base oil, 8-16 parts of a corrosion inhibitor, 2-5 parts of a lubricant, 0.2-0.7 part of an emulsifier, 1.5-2.5 parts of a film-forming agent and 1-3 parts of a dispersant; wherein the corrosion inhibitor comprises glutaraldehyde modified polyaspartic acid, sorbitan monooleate and petroleum calcium sulfonate according to the weight ratio of 1: (0.3-0.6): (0.2-0.5), and the antirust effect and the lubricating effect of the hydraulic oil are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic oil, and in particular to an environmentally friendly long-life hydraulic oil and a preparation method thereof. Background Art

[0002] Hydraulic oil is the hydraulic medium used in hydraulic system. It plays the role of energy transmission, system lubrication, anti-corrosion, anti-rust, cooling, etc. In hydraulic system, hydraulic oil should first meet the requirements of hydraulic device for liquid viscosity at working temperature and starting temperature. Since the viscosity change of oil is directly related to hydraulic action, transmission efficiency and transmission accuracy, the viscosity-temperature performance and shear stability of oil should also meet the various requirements put forward by different uses. Currently, the widely used environmentally friendly long-life hydraulic oil has problems such as metal corrosion and poor lubrication performance during use. Summary of the invention

[0003] In order to solve the problem that the existing environmentally friendly long-life hydraulic oil has poor anti-corrosion performance and lubrication performance, the present invention provides an environmentally friendly long-life hydraulic oil and a preparation method thereof, so as to effectively improve the anti-rust effect and lubrication effect of the hydraulic oil.

[0004] The first aspect of the present invention is to provide an environmentally friendly long-life hydraulic oil using the following technical solution:

[0005] The invention discloses an environmentally friendly long-life hydraulic oil, which comprises the following raw materials in parts by weight: 70-85 parts of base oil, 8-16 parts of corrosion inhibitor, 4-10 parts of dialkyl dithiophosphate oxymolybdenum, 2-5 parts of lubricant, 0.2-0.7 parts of emulsifier, 1.5-2.5 parts of film former and 1-3 parts of dispersant; wherein the corrosion inhibitor comprises glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate in a weight ratio of 1:(0.3-0.6):(0.2-0.5).

[0006] By adopting the above technical scheme, when the corrosion inhibitor in the present application adopts a mixture of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate, it has good solubility in the base oil, and the glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate are staggered and hooked to form a multi-layered molecular adsorption film, which jointly blocks the gaps between each other, making the adsorption film more complete and tighter, and can effectively improve the adsorption capacity of the corrosion inhibitor molecules on the metal surface, thereby achieving good anti-rust performance; and when the corrosion inhibitor adopts a mixture of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate, it has a good coordination effect with the lubricant and dialkyl dithiophosphate oxymolybdenum (antiwear agent), and the synergistic effect between the two can effectively protect metal parts from wear and extend the service life of metal parts.

[0007] Preferably, in the glutaraldehyde-modified polyaspartic acid, the weight ratio of glutaraldehyde to polyaspartic acid is 1:(1.5-2.5).

[0008] By adopting the above technical scheme, when the weight ratio of glutaraldehyde to polyaspartic acid in glutaraldehyde-modified polyaspartic acid is within this range, the corrosion inhibition efficiency of glutaraldehyde-modified polyaspartic acid can reach the best, because the groups or atoms in the polyaspartic acid and glutaraldehyde molecules promote each other's adsorption on the metal surface, forming a thicker and more firmly adsorbed protective layer, which effectively covers the metal surface, thereby preventing hydrogen ions, sulfate ions and the like from entering the metal surface, and preventing the metal from being corroded.

[0009] Preferably, the modification method of glutaraldehyde-modified polyaspartic acid comprises the following steps: mixing polyaspartic acid with water and stirring until dissolved, then adding glutaraldehyde aqueous solution and mixing evenly, and standing for 12 hours without precipitation to obtain glutaraldehyde-modified polyaspartic acid.

[0010] Preferably, the lubricant comprises polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:(0.4-0.7).

[0011] By adopting the above technical scheme, the lubricant is composed of polyacrylamide and fatty alcohol polyoxyethylene ether, which can not only improve the wetting performance and flow performance of the hydraulic oil, but also the polyacrylamide further provides additional lubrication and protection through its polymer structure. Therefore, the synergistic cooperation of the two can significantly improve the lubrication performance of the hydraulic oil and reduce mechanical wear.

[0012] Preferably, the relative molecular weight of the polyacrylamide is 6 million to 8 million.

[0013] By adopting the above technical solution, when the molecular weight of polyacrylamide is between 6 million and 8 million, it can effectively ensure that the hydraulic oil has good viscosity, ensure the adhesion effect of the hydraulic oil on the metal, and effectively improve the protective effect of the hydraulic oil on the metal.

[0014] Preferably, the emulsifier is alkyl glycoside.

[0015] By adopting the above technical solution, after the emulsifier adopts alkyl glycoside, the surface tension and interfacial tension of the hydraulic oil can be effectively reduced, the stability and emulsification performance of the hydraulic oil can be improved, the foam can be reduced, the precipitation and stratification can be prevented, and the anti-rust effect of the hydraulic oil can be effectively improved.

[0016] Preferably, the dispersant is dioctyl phthalate.

[0017] By adopting the above technical solution, when dioctyl phthalate is used as a dispersant, the dispersibility and stability of the lubricant and corrosion inhibitor in the base oil can be effectively improved, thereby indirectly improving the lubrication and rust prevention performance of the hydraulic oil.

[0018] Preferably, the film-forming agent is modified polyethylene wax.

[0019] By adopting the above technical scheme, when modified polyethylene wax is selected as the film-forming agent, its combination with the corrosion inhibitor can promote the corrosion inhibitor to spread better on the metal surface, forming a tight hydraulic oil film on the metal surface, and the addition of modified polyethylene wax can also enhance the strength of the oil film, thereby effectively preventing metal corrosion.

[0020] Preferably, the base oil comprises 150N base oil and D60 base oil in a weight ratio of 1:(0.7-1.1).

[0021] By adopting the above technical scheme, the base oil plays a role as a carrier on the one hand, so that the corrosion inhibitor, lubricant and emulsifier are evenly dispersed. On the other hand, the base oil participates in the formation of the hydraulic oil film and has a more obvious oil effect. The oil effect refers to the position where the corrosion inhibitor is less adsorbed. The base oil can be physically adsorbed on the metal surface and penetrate into the directionally adsorbed corrosion inhibitor molecules. The corrosion inhibitor molecules fill the pores together through the van der Waals force, making the hydraulic oil film more complete and dense. In this application, when the hydraulic oil is blended with two base oils of different viscosity grades, 150N base oil and D60 base oil, better anti-rust performance can be obtained. The reason may be that the hydrocarbon molecules of 150N base oil and D60 base oil differ greatly in their chain structure and molecular weight, that is, the molecular size is different. Because of this, the combination of 150N base oil and D60 base oil can cover or fill the pores of different sizes formed when the corrosion inhibitor forms a film, so the anti-rust performance is higher.

[0022] If the flash point of the base oil is too low, it will evaporate too quickly, causing the hydraulic oil film to spread unevenly on the metal surface. It will also cause the base oil in the oil tank to evaporate too quickly, requiring frequent refilling and resulting in large losses. Therefore, this application selects a combination of 150N base oil and D60 base oil, which can effectively ensure that the corrosion inhibitor forms a uniform film on the metal surface and improve the protective effect of the hydraulic oil on the metal.

[0023] The second aspect of the present application is to provide a method for preparing the above-mentioned environmentally friendly and long-life hydraulic oil, comprising the following preparation steps: heating and stirring the base oil at 40-50°C, then adding corrosion inhibitors, lubricants, emulsifiers, film-forming agents and dispersants in sequence, stirring at a constant temperature of 35-45°C for 1-2 hours, and then filtering the obtained hydraulic oil.

[0024] In summary, the present invention has the following beneficial effects:

[0025] 1. The combination of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and petroleum calcium sulfonate has good solubility in base oil, and glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and petroleum calcium sulfonate are staggered and hooked to form a multi-layered molecular adsorption film, which jointly blocks the gaps between each other, making the adsorption film more complete and tighter, thereby effectively improving the adsorption capacity of the corrosion inhibitor molecules on the metal surface, thereby achieving good anti-rust performance; and when the corrosion inhibitor adopts a mixture of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and petroleum calcium sulfonate, it has a good coordination effect with the lubricant and a better protective effect on the metal.

[0026] 2. The limitation of molecular weight of polyacrylamide in lubricant is beneficial to improve the lubricating performance of hydraulic oil and effectively improve the protective effect of hydraulic oil on metal.

[0027] 3. The combination of two base oils with different flash points and viscosities in the present application can not only improve the dispersion stability of corrosion inhibitors, lubricants and emulsifiers in the base oil, but also the combination of the base oil with glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate can effectively improve the bonding force between the hydraulic oil film and the metal, thereby effectively improving the rust resistance and corrosion resistance of the hydraulic oil film. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the embodiments.

[0029] The raw materials used in this application are all commercially available.

[0030] Example 1

[0031] A method for preparing an environmentally friendly and long-life hydraulic oil comprises the following preparation steps:

[0032] S1. Mix 70 kg of base oil at 40° C., heat and stir evenly, wherein the base oil includes 150N base oil and D60 base oil in a weight ratio of 1:0.7, i.e. 41.2 kg of 150N base oil and 28.8 kg of D60 base oil, the CAS number of 150N base oil is 64742-52-5, the flash point is 242° C., and the kinematic viscosity (40° C.) is 86 mm 2 / s, D60 base oil flash point 68℃, kinematic viscosity (40℃) 1.308mm 2 / s;

[0033] S2, to the mixture obtained in step S1, 8 kg of corrosion inhibitor, 4 kg of dialkyl dithiophosphate oxymolybdenum, 2 kg of lubricant, 0.2 kg of emulsifier (alkyl glycoside), 1.5 kg of film-forming agent (modified polyethylene wax) and 1 kg of dispersant (dioctyl phthalate) were added in sequence, and the mixture was stirred at a constant temperature of 35 ° C for 2 h, and then the hydraulic oil obtained was filtered;

[0034] The corrosion inhibitor includes glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate in a weight ratio of 1:0.3:0.2, namely 5.3 kg of glutaraldehyde-modified polyaspartic acid, 1.6 kg of sorbitan monooleate and 1.1 kg of calcium petroleum sulfonate;

[0035] The glutaraldehyde-modified polyaspartic acid adopts the following modification method: 5 kg of polyaspartic acid is mixed with 3 kg of water and stirred until dissolved, and then a glutaraldehyde aqueous solution (3.3 kg of glutaraldehyde is dissolved in 2 kg of water) is added and mixed evenly, and then left for 12 hours without precipitation to obtain glutaraldehyde-modified polyaspartic acid, that is, the weight ratio of polyaspartic acid to glutaraldehyde is 1.5:1

[0036] The lubricant is composed of polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.4, the amount of polyacrylamide is 1.43 kg, the relative molecular weight is 6 million, the amount of fatty alcohol polyoxyethylene ether is 0.57 kg, and the CAS number of fatty alcohol polyoxyethylene ether is 68131-39-5.

[0037] Example 2

[0038] A method for preparing an environmentally friendly and long-life hydraulic oil comprises the following preparation steps:

[0039] S1. Mix 78 kg of base oil at 50° C., heat and stir evenly, wherein the base oil includes 150N base oil and D60 base oil in a weight ratio of 1:0.7, i.e., 45.9 kg of 150N base oil and 32.1 kg of D60 base oil, the CAS number of 150N base oil is 64742-52-5, the flash point is 242° C., and the kinematic viscosity (40° C.) is 86 mm 2 / s, D60 base oil flash point 68℃, kinematic viscosity (40℃) 1.308mm 2 / s;

[0040] S2, to the mixture obtained in step S1, 12 kg of corrosion inhibitor, 7 kg of dialkyl dithiophosphate oxymolybdenum, 3.5 kg of lubricant, 0.5 kg of emulsifier (alkyl glycoside), 2 kg of film-forming agent (modified polyethylene wax) and 2 kg of dispersant (dioctyl phthalate) were added in sequence, and the mixture was stirred at a constant temperature of 40° C. for 1.5 h, and then the hydraulic oil obtained was filtered;

[0041] The corrosion inhibitor includes glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate in a weight ratio of 1:0.3:0.2, namely 8 kg of glutaraldehyde-modified polyaspartic acid, 2.4 kg of sorbitan monooleate and 1.6 kg of calcium petroleum sulfonate;

[0042] The glutaraldehyde-modified polyaspartic acid adopts the following modification method: 7 kg of polyaspartic acid and 4 kg of water are mixed and stirred until dissolved, and then a glutaraldehyde aqueous solution (4.7 kg of glutaraldehyde is dissolved in 2.8 kg of water) is added and mixed evenly, and then left for 12 hours without precipitation to obtain glutaraldehyde-modified polyaspartic acid, that is, the weight ratio of polyaspartic acid to glutaraldehyde is 1.5:1;

[0043] The lubricant is composed of polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.4, the amount of polyacrylamide is 2.5 kg, the relative molecular weight is 6 million, the amount of fatty alcohol polyoxyethylene ether is 1 kg, and the CAS number of fatty alcohol polyoxyethylene ether is 68131-39-5.

[0044] Example 3

[0045] A method for preparing an environmentally friendly and long-life hydraulic oil comprises the following preparation steps:

[0046] S1. Mix 85 kg of base oil at 50° C., heat and stir evenly, wherein the base oil includes 150N base oil and D60 base oil in a weight ratio of 1:0.7, i.e., 50 kg of 150N base oil and 35 kg of D60 base oil, the CAS number of 150N base oil is 64742-52-5, the flash point is 242° C., and the kinematic viscosity (40° C.) is 86 mm 2 / s, D60 base oil flash point 68℃, kinematic viscosity (40℃) 1.308mm 2 / s

[0047] S2, to the mixture obtained in step S1, 16 kg of corrosion inhibitor, 10 kg of dialkyl dithiophosphate oxymolybdenum, 5 kg of lubricant, 0.7 kg of emulsifier (alkyl glycoside), 2.5 kg of film-forming agent (modified polyethylene wax) and 3 kg of dispersant (dioctyl phthalate) were added in sequence, and the mixture was stirred at a constant temperature of 35-45° C. for 1-2 h, and then the hydraulic oil obtained was filtered;

[0048] The corrosion inhibitor includes glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate in a weight ratio of 1:0.3:0.2, namely 10.7 kg of glutaraldehyde-modified polyaspartic acid, 3.2 kg of sorbitan monooleate and 2.1 kg of calcium petroleum sulfonate;

[0049] The glutaraldehyde-modified polyaspartic acid adopts the following modification method: 9 kg of polyaspartic acid and 5 kg of water are mixed and stirred until dissolved, and then a glutaraldehyde aqueous solution (6 kg of glutaraldehyde is dissolved in 3.5 kg of water) is added and mixed evenly, and then left for 12 hours without precipitation to obtain glutaraldehyde-modified polyaspartic acid, that is, the weight ratio of polyaspartic acid to glutaraldehyde is 1.5:1;

[0050] The lubricant is composed of polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.4, the amount of polyacrylamide is 3.6 kg, the relative molecular weight is 6 million, the amount of fatty alcohol polyoxyethylene ether is 1.4 kg, and the CAS number of fatty alcohol polyoxyethylene ether is 68131-39-5.

[0051] Example 4

[0052] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 2 in that the content of each component in the corrosion inhibitor is different, specifically, the total amount of the corrosion inhibitor is 12 kg, which includes glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate in a weight ratio of 1:0.5:0.3, that is, 6.7 kg of glutaraldehyde-modified polyaspartic acid, 3.3 kg of sorbitan monooleate, and 2 kg of calcium petroleum sulfonate, and the rest is the same as Example 2.

[0053] Example 5

[0054] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 2 in that the content of each component in the corrosion inhibitor is different, specifically, the total amount of the corrosion inhibitor is 12 kg, which includes glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate in a weight ratio of 1:0.6:0.5, that is, 5.7 kg of glutaraldehyde-modified polyaspartic acid, 3.4 kg of sorbitan monooleate, and 2.9 kg of calcium petroleum sulfonate, and the rest is the same as Example 2.

[0055] Example 6

[0056] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that the weight ratio of polyaspartic acid to glutaraldehyde in the glutaraldehyde-modified polyaspartic acid is 2:1, that is, the amount of polyaspartic acid is 9.4 kg, and the amount of glutaraldehyde is 4.7 kg, and the rest is the same as Example 4.

[0057] Example 7

[0058] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that the weight ratio of polyaspartic acid to glutaraldehyde in the glutaraldehyde-modified polyaspartic acid is 2.5:1, that is, the amount of polyaspartic acid is 11.75 kg, and the amount of glutaraldehyde is 4.7 kg, and the rest is the same as Example 4.

[0059] Example 8

[0060] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 6 in that the content of each component in the lubricant is different, specifically: the total amount of the lubricant is 3.5 kg, which includes polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.5, that is, the amount of polyacrylamide is 2.3 kg, the relative molecular weight is 6 million, and the amount of fatty alcohol polyoxyethylene ether is 1.2 kg, and the rest is the same as Example 6.

[0061] Example 9

[0062] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 6 in that the content of each component in the lubricant is different, specifically: the total amount of the lubricant is 3.5 kg, which includes polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.7, that is, the amount of polyacrylamide is 2.1 kg, the relative molecular weight is 6 million, and the amount of fatty alcohol polyoxyethylene ether is 1.4 kg, and the rest is the same as Example 6.

[0063] Example 10

[0064] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 4 in that the molecular weight of the polyacrylamide is 7 million, and the rest is the same as Example 4.

[0065] Embodiment 11

[0066] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 4 in that the molecular weight of the polyacrylamide is 8 million, and the rest is the same as Example 4.

[0067] Example 12

[0068] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 4 in that the relative molecular weight of polyacrylamide is 9 million, and the rest is the same as Example 4.

[0069] Embodiment 13

[0070] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 4 in that the relative molecular weight of polyacrylamide is 5 million, and the rest is the same as Example 4.

[0071] Embodiment 14

[0072] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 4 in that only 150N base oil is used as the base oil, and the rest is the same as Example 4.

[0073] Embodiment 15

[0074] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that only D60 base oil is used as the base oil, and the rest is the same as Example 4.

[0075] Example 16

[0076] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that an equal amount of kerosene is used to replace the D60 base oil, that is, the base oil consists of 150N base oil and kerosene, and the rest is the same as Example 4.

[0077] Embodiment 17

[0078] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that an equal amount of 30# machine oil is used to replace 150N base oil, that is, the base oil consists of 30# machine oil and D60 base oil, and the rest is the same as Example 4.

[0079] Embodiment 18

[0080] A method for preparing an environmentally friendly and long-life hydraulic oil is different from that of Example 4 in that only fatty alcohol polyoxyethylene ether is used as the lubricant, and the rest are the same as those of Example 4.

[0081] Embodiment 19

[0082] A method for preparing an environmentally friendly and long-life hydraulic oil is different from Example 4 in that the lubricant only uses polyacrylamide with a relative molecular weight of 6 million, and the rest is the same as Example 4.

[0083] Comparative Example 1

[0084] A method for preparing an environmentally friendly long-life hydraulic oil is different from Example 4 in that only glutaraldehyde-modified polyaspartic acid is used as the corrosion inhibitor, and the rest is the same as Example 4.

[0085] Comparative Example 2

[0086] A method for preparing an environmentally friendly long-life hydraulic oil is different from Example 4 in that only sorbitan monooleate is used as the corrosion inhibitor, and the rest are the same as Example 4.

[0087] Comparative Example 3

[0088] A method for preparing an environmentally friendly and long-life hydraulic oil, which is different from Example 4 in that the corrosion inhibitor is composed of sorbitan monooleate and calcium petroleum sulfonate, and the specific addition amount is 7.5 kg of sorbitan monooleate and 4.5 kg of calcium petroleum sulfonate, and the rest is the same as Example 4.

[0089] Comparative Example 4

[0090] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that the corrosion inhibitor is composed of glutaraldehyde-modified polyaspartic acid and sorbitan monooleate, and the specific addition amount is 8 kg of glutaraldehyde-modified polyaspartic acid and 4 kg of sorbitan monooleate, and the rest is the same as Example 4.

[0091] Comparative Example 5

[0092] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that the polyaspartic acid uses unmodified polyaspartic acid, and the rest is the same as Example 4.

[0093] Comparative Example 6

[0094] A method for preparing an environmentally friendly long-life hydraulic oil, which is different from Example 4 in that an equal amount of calcium dinonylnaphthalenesulfonate is used instead of calcium petroleum sulfonate, and the rest is the same as Example 4.

[0095] Comparative Example 7

[0096] A method for preparing an environmentally friendly long-life hydraulic oil is different from Example 4 in that no lubricant is added in step S2, and the amount of dialkyl dithiophosphate oxymolybdenum is added is 10.5 kg, and the rest is the same as Example 4.

[0097] Performance Testing

[0098] The hydraulic oils obtained in the above examples and comparative examples were subjected to the following performance tests, and the test results are shown in Table 1.

[0099] According to the relevant provisions of GB / T5096-2017 "Petroleum Products Copper Strip Corrosion Test Method", the corrosion of hydraulic oil on copper strips is tested at 100°C for 3h. The evaluation criteria for copper strip corrosion include level 1 mild discoloration, level 2 moderate discoloration, level 3 deep discoloration, and level 4 corrosion. Among them, in level 1 mild discoloration, 1a is light orange, almost the same as a newly polished copper strip, 1b is dark orange; 2a is purple-red, 2b is light purple, 2c is a multi-color with light purple-blue or (and) silver and covered on purple-red, 2d is silver, and 2e is brass or golden yellow; 3a is a multi-color with magenta covering brass, 3b is a multi-color with red and green display (peacock green), but without gray; 4a is transparent black, dark gray or brown with only peacock green, 4b is graphite black or matte black, and 4c is shiny black or shiny black;

[0100] According to the standard of SH / T0189 "Determination of Anti-wear Performance of Lubricating Oil (Four-ball Machine Method)", the wear performance of the hydraulic oil provided in this application is tested. The experimental conditions are: 392N (40kg), 75°C, 1200r / min, 60min. The experimental result is the wear spot diameter. The smaller the wear spot diameter, the better the anti-wear performance of the hydraulic oil.

[0101] The kinematic viscosity of the hydraulic oil at 40°C is tested according to the relevant provisions of GB / T265.

[0102] Table 1 Hydraulic oil test results

[0103] sample <![CDATA[Kinematic viscosity (40 °C) mm 2 / s]]> Copper sheet corrosion (100℃, 3h) level Four-ball wear spot diameter mm Example 1 36.6 1b 0.45 Example 2 37.3 1b 0.44 Example 3 37.5 1b 0.44 Example 4 37.5 1a 0.43 Example 5 37.4 1a 0.43 Example 6 37.5 1a 0.43 Example 7 37.5 1a 0.43 Example 8 37.6 none 0.42 Example 9 37.5 none 0.42 Example 10 37.5 1a 0.40 Embodiment 11 37.7 1a 0.41 Example 12 37.9 1a 0.49 Embodiment 13 37.5 1a 0.51 Embodiment 14 37.3 1b 0.49 Embodiment 15 37.2 1b 0.51 Example 16 37.4 1b 0.46 Embodiment 17 37.5 1b 0.47 Embodiment 18 37.3 1b 0.55 Embodiment 19 37.6 1b 0.51 Comparative Example 1 37.4 2b 0.46 Comparative Example 2 37.5 2b 0.47 Comparative Example 3 37.4 2a 0.47 Comparative Example 4 37.5 2a 0.46 Comparative Example 5 37.4 1b 0.47 Comparative Example 6 37.4 1b 0.44 Comparative Example 7 37.4 2a 0.49

[0104] From the table above we can see that:

[0105] The hydraulic oil obtained in Examples 1-3 of the present application has a corrosion grade of 1b for the copper sheet under the conditions of 100°C and 3h, and the diameter of the four-ball wear spot is less than or equal to 0.45mm, indicating that the hydraulic oil of the present application has good corrosion resistance and excellent anti-wear performance, and can effectively protect metals.

[0106] Compared with Example 2, when the content of sorbitan monooleate and calcium petroleum sulfonate in the corrosion inhibitor increases, the corrosion grade of the copper sheet and the four-ball wear spot diameter of the hydraulic oil obtained in Example 4-5 at 100°C and 3h are reduced compared with the corrosion grade and wear spot diameter in Example 2, and the reduction in corrosion grade and wear spot diameter can further illustrate that, when the total amount of corrosion inhibitor remains unchanged, the ratio of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate will affect the corrosion resistance and wear resistance of the hydraulic oil; it can be seen from Example 5 that the various properties of Example 5 no longer continue to increase compared with Example 4, which shows that when the ratio of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate is within the range specified in the present application, the corrosion resistance and wear resistance of the hydraulic oil can be effectively improved.

[0107] Compared with Example 4, in glutaraldehyde-modified polyaspartic acid, as the content of polyaspartic acid increases, the corrosion grade of the copper sheet of the hydraulic oil in Examples 6-7 is 1a under the conditions of 100°C and 3h. It can be seen that when the ratio of polyaspartic acid to glutaraldehyde is 1.5-2.5:1, the anti-corrosion performance of the hydraulic oil can be guaranteed.

[0108] Compared with Example 6, when the total amount of lubricant remains unchanged, with the increase of the content of fatty alcohol polyoxyethylene ether, the hydraulic oil obtained in Examples 8-9 did not corrode the copper sheet under the conditions of 100°C and 3h, and the wear spot diameter was reduced compared with the wear spot diameter in Example 6. However, when the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether reached 1:0.7, the wear spot diameter no longer continued to decrease. It can be seen that when the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether is within the range specified in the present application, not only the corrosion resistance of the hydraulic oil can be improved, but also the anti-wear performance of the hydraulic oil can be improved.

[0109] Compared with Example 4, when the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether remains unchanged, as the relative molecular weight of polyacrylamide increases, the wear spot diameters of the hydraulic oils obtained in Examples 10-12 are reduced compared with those in Example 4 during detection, indicating that as the relative molecular mass of polyacrylamide increases, the anti-wear performance of the hydraulic oil is further improved. However, when the relative molecular mass of polyacrylamide reaches 9 million, the wear spot diameter of the hydraulic oil obtained in Example 12 is greatly increased compared with that in Example 4 during detection, which shows that when the molecular weight of polyacrylamide exceeds 8 million, the anti-wear performance of the hydraulic oil is reduced.

[0110] Compared with Example 4, when the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether remains unchanged, when the relative molecular weight of polyacrylamide is lower than 6 million specified in the present application, the anti-wear performance obtained in Example 13 is significantly reduced compared with that in Example 4.

[0111] Compared with Example 4, when the base oil only uses 150N base oil or D60 base oil, the corrosion level of the copper sheet of the hydraulic oil obtained in Examples 14-15 at 100°C and 3h is higher than that of Example 4, and the wear spot diameter is higher than that of Example 4; Compared with Example 4, when the base oil is composed of 150N base oil and kerosene or the base oil is composed of 30# machine oil and D60 base oil, the corrosion level of the copper sheet of the hydraulic oil obtained in Examples 16-17 at 100°C and 3h is higher than that of Example 4, and the wear spot diameter is higher than that of Example 4. It can be seen that when the base oil of the present application is composed of 150N base oil and D60 base oil, the combination of the two can effectively ensure that the corrosion inhibitor is effectively spread on the metal surface, thereby improving the anti-corrosion and anti-wear properties of the hydraulic oil.

[0112] Compared with Example 4, when the lubricant only uses fatty alcohol polyoxyethylene ether or polyacrylamide with a relative molecular weight of 6 million, the corrosion level of the copper sheet of the hydraulic oil obtained in Examples 18-19 at 100°C and 3h is higher than that in Example 4, and the wear spot diameter is higher than that in Example 4. It can be seen that the combination of fatty alcohol polyoxyethylene ether and polyacrylamide can effectively improve the corrosion resistance and wear resistance of the hydraulic oil.

[0113] Compared with Example 4, when the corrosion inhibitor only uses glutaraldehyde-modified polyaspartic acid or sorbitan monooleate, the hydraulic oil obtained in Comparative Example 1-2 has an increased corrosion grade of the copper sheet under the conditions of 100°C and 3h compared with Example 4, and the wear spot diameter is increased compared with Example 4; Compared with Example 4, when the corrosion inhibitor is composed of sorbitan monooleate and calcium petroleum sulfonate or the corrosion inhibitor is composed of glutaraldehyde-modified polyaspartic acid and sorbitan monooleate, the hydraulic oil obtained in Comparative Example 3-4 has an increased corrosion grade of the copper sheet under the conditions of 100°C and 3h compared with Example 4, and the wear spot diameter is increased compared with Example 4. It can be seen that when the corrosion inhibitor in the present application is composed of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate and calcium petroleum sulfonate, the anti-corrosion and anti-wear properties of the hydraulic oil can be effectively improved, and the protection effect on metal can be effectively improved.

[0114] Compared with Example 4, when unmodified polyaspartic acid or an equal amount of calcium dinonylnaphthalenesulfonate is used instead of petroleum calcium sulfonate, the hydraulic oil obtained in Comparative Example 5 has an increased corrosion level of the copper sheet under the conditions of 100°C and 3h, and an increased wear spot diameter compared with Example 4; the hydraulic oil obtained in Comparative Example 6 has an increased corrosion level of the copper sheet under the conditions of 100°C and 3h, and an increased wear spot diameter compared with Example 4. This further illustrates that the combined use of the three corrosion inhibitors in the present application can effectively improve the anti-rust and anti-wear effects of the hydraulic oil, thereby effectively improving the protective effect on the metal.

[0115] Compared with Example 4, when the lubricant is missing in the raw material and the amount of the anti-wear agent dialkyl dithiophosphate oxymolybdenum is increased, the hydraulic oil obtained in Comparative Example 7 has a copper sheet corrosion level significantly higher than that in Example 4 under the conditions of 100°C and 3h, and the wear spot diameter is also significantly higher than that in Example 4. It can be seen that the anti-wear performance of the hydraulic oil cannot be effectively improved under the condition of increasing the anti-wear agent. It can be seen that the combination of the lubricant and the anti-wear agent dialkyl dithiophosphate oxymolybdenum can effectively improve the anti-wear performance of the hydraulic oil.

[0116] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly long-life hydraulic oil, characterized in that the hydraulic oil comprises the following raw materials in parts by weight: 70-85 parts of base oil, 8-16 parts of corrosion inhibitor, 4-10 parts of dialkyl dithiophosphate oxymolybdenum, 2-5 parts of lubricant, 0.2-0.7 parts of emulsifier, 1.5-2.5 parts of film-forming agent, and 1-3 parts of dispersant; wherein the corrosion inhibitor comprises glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1: (0.3-0.6): (0.2-0.5).

2. The environmentally friendly long-life hydraulic oil according to claim 1, characterized in that: In the glutaraldehyde-modified polyaspartic acid, the weight ratio of glutaraldehyde to polyaspartic acid is 1:(1.5-2.5).

3. The environmentally friendly long-life hydraulic oil according to claim 2, characterized in that: The modification method of glutaraldehyde-modified polyaspartic acid comprises the following steps: mixing polyaspartic acid with water and stirring until dissolved, then adding glutaraldehyde aqueous solution and mixing evenly, and standing for 12 hours without precipitation to obtain glutaraldehyde-modified polyaspartic acid.

4. The environmentally friendly long-life hydraulic oil according to claim 1, characterized in that: The lubricant comprises polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:(0.4-0.7).

5. The environmentally friendly long-life hydraulic oil according to claim 3, characterized in that: The relative molecular weight of the polyacrylamide is 6 million to 8 million.

6. The environmentally friendly long-life hydraulic oil according to claim 1, characterized in that: The emulsifier is alkyl glycoside.

7. The environmentally friendly long-life hydraulic oil according to claim 1, characterized in that: The dispersant is dioctyl phthalate.

8. The environmentally friendly long-life hydraulic oil according to claim 1, characterized in that: The film-forming agent is modified polyethylene wax.

9. The environmentally friendly long-life hydraulic oil according to claim 1, characterized in that: The base oil includes 150N base oil and D60 base oil in a weight ratio of 1:(0.7-1.1).

10. A method for preparing an environmentally friendly long-life hydraulic oil according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: heating and stirring the base oil at 40-50° C., adding a corrosion inhibitor, a lubricant, an emulsifier, a film former and a dispersant in sequence, stirring at a constant temperature of 35-45° C. for 1-2 hours, and then filtering the obtained hydraulic oil.