CN114958462B - Synthetic hydraulic oil for wind power generation hydraulic system and preparation method thereof - Google Patents
Synthetic hydraulic oil for wind power generation hydraulic system and preparation method thereof Download PDFInfo
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Abstract
The application relates to the technical field of hydraulic oil for hydraulic systems, in particular to synthetic hydraulic oil for a wind power generation hydraulic system and a preparation method thereof. The synthetic hydraulic oil comprises a) 50wt% or more of a coal-based oil base oil having a kinematic viscosity at 100 ℃ of not less than 2.0mm 2 S; b) 0.1 to 1 weight percent of pour point depressant. The synthetic hydraulic oil of the application has excellent viscosity-temperature performance, the viscosity index is close to 175, and the kinematic viscosity at 40 ℃ is 28-36 mm 2 In the range of/s, the hydraulic system of the wind generating set can keep good lubrication, cooling and other performances within the temperature change range of about minus 50 ℃ to 55 ℃, and the defect of performance of the hydraulic system caused by the change of the system temperature when the wind generating set works around the clock is avoided. In addition, the synthetic hydraulic oil of the application does not use or uses a small amount of viscosity index improver, improves the viscosity-temperature performance of the hydraulic oil, does not sacrifice the shearing performance of the hydraulic oil, and ensures longer service life.
Description
Technical Field
The application relates to the technical field of hydraulic oil for hydraulic systems, in particular to synthetic hydraulic oil for a wind power generation hydraulic system and a preparation method thereof.
Background
The main function of the hydraulic system of the wind generating set is braking (high and low speed shafts, yaw braking), pitch control and yaw control. The working power of the hydraulic system is a hydraulic pump, the transmission medium is hydraulic oil, the control element is an electric valve, and the variable pitch of the blade is realized by changing the radial movement of the piston rod of the oil cylinder into the circular movement of the blade. Compared with the traditional hydraulic system, the wind power generation hydraulic system has the characteristics of difficult oil change, most of precise elements, large environmental temperature difference and the like. The concrete steps are as follows: the oil is generally replaced by lifting the engine room to 80m high by a small crane; because the hydraulic element for the fan is precise and has no piece, the field of the fan is generally not provided with an oil filtering trolley, once impurities appear, the flow of an oil way of hydraulic equipment is easily reduced or even blocked, and when serious, some sealing mechanical devices are worn, so that the failure is caused; the hydraulic pitch control works almost all-weather, and the working temperature is between-45 ℃ and 55 ℃. Therefore, the synthetic hydraulic oil for the traditional hydraulic system cannot completely meet the requirements of the hydraulic system of the wind generating set, particularly in severe cold seasons, when the working temperature of the hydraulic oil is reduced to a certain degree, the viscosity of oil products can be increased, the movement resistance of hydraulic components is increased, and the problems that 3 blades of a hydraulic pitch fan are asynchronous in pitch change or the pitch change speed is slow and the like often occur due to low temperature are solved. When serious, the wind field is easy to cause large-area shutdown accidents, and simultaneously causes larger impact on the power grid.
Although, in order to solve the above problems, there have been some means for solving the problems, such as synthetic base oils such as polyalphaolefins and low-setting base oils such as naphthenic oils. However, the cost of the synthetic base oil such as poly alpha olefin is too high, which can reach about 3 times of that of mineral oil, and the economic benefit is poor; the viscosity index of the low-viscosity base oil is low, and a large amount of viscosity index improver needs to be added to improve the viscosity-temperature performance, so that the shearing performance of the low-viscosity base oil is reduced, and the service life of the oil is greatly reduced.
Disclosure of Invention
Aiming at the technical problems, the application provides wind power hydraulic oil with both cost and performance, wherein the base oil is coal-to-oil base oil, and the performance of the wind power hydraulic oil is comparable to that of synthetic oil.
Specifically, a first aspect of the present application provides a synthetic hydraulic oil comprising: a) 50wt% or more of a coal-derived oil base oil having a kinematic viscosity at 100 ℃ of not less than 2.0mm 2 S; b) 0.1 to 1wt% of a pour point depressant; c) 1-5 wt% of viscosity index improver which is acrylic polymer; the PSSI of the acrylic polymer is not higher than 50.
The coal-to-oil base oil adopted in the application is hydrocarbon which is synthesized by the coal reacting with oxygen and steam at high temperature to gasify the coal completely, converting the coal into a mixture of carbon monoxide, methane and hydrogen and then under the action of an iron-based or cobalt-based catalyst, wherein the main component is isoparaffin.
Further, the content of the base oil for coal-to-oil is 70% or more.
Further, the number of carbon atoms of the coal-based oil base oil is C7-C60.
The number of carbon atoms of the coal oil base oil of the application can be determined by 13 C-NMR、 1 H-NMR was combined for test determination.
The coal-based oil base oil employed in the present application has a relatively high viscosity index, so that the amount of viscosity index improver used in the synthetic hydraulic oil of the present application may be reduced, or even no viscosity index improver may be employed. The term "viscosity index" refers to the degree to which the viscosity of a fluid changes with temperature, with higher viscosity index indicating that the viscosity of the fluid is less affected by temperature and less sensitive to temperature. The viscosity index in the application can be obtained by testing according to national standard GB/T1995 petroleum product viscosity index calculation method.
Further, the kinematic viscosity of the coal-to-liquid base oil at 100 ℃ is 2.0-13 mm 2 /s。
Further, the kinematic viscosity of the coal-to-liquid base oil at 100 ℃ is 2.8-10 mm 2 /s。
Further, the kinematic viscosity of the coal-to-liquid base oil at 40 ℃ is 6.5-80 mm 2 S; further, the kinematic viscosity of the coal-to-liquid base oil at 40 ℃ is 10-55 mm 2 S; further preferably, the kinematic viscosity of the coal-to-liquid base oil at 40 ℃ is 28-36 mm 2 /s。
The term "kinematic viscosity" in the present application measures the physical quantity of the magnitude of the flow resistance of the fluid under the action of gravity, and is classified into a kinematic viscosity at 100 ℃ and a kinematic viscosity at 40 ℃ according to the temperature at the time of the test. The kinematic viscosity at 100 ℃ and the kinematic viscosity at 40 ℃ in the application are obtained by testing according to national standard GB/T265 Petroleum product kinematic viscosity measurement method and dynamic viscosity calculation method. According to the application, through regulating and controlling the number of carbon atoms, the kinematic viscosity and the like of the coal-to-liquid oil, the viscosity index is high, the stability is better at a lower temperature, and the problems of increased viscosity of hydraulic oil, increased kinematic resistance of hydraulic components and the like caused by temperature reduction in the environment are effectively avoided.
The coal-based oil base oil adopted in the application has lower pour point and small evaporation loss, and can meet the requirements of high-performance lubricating oil such as blended hydraulic oil and gear oil.
Further, the pour point of the coal-based oil base oil is not higher than-30 ℃.
Further, the pour point of the coal-based oil base oil is not higher than-35 ℃.
Further, the pour point of the base oil of the coal-to-liquid oil is not higher than-40 ℃.
The term "pour point" in the present application refers to the lowest temperature at which a cooled hydraulic oil sample can flow under prescribed test conditions, the lower the pour point, the better the low temperature fluidity of the hydraulic oil. The pour point of the application is obtained by testing according to the national standard GB/T3536 open cup method for measuring flash point and fire point of Petroleum products.
The coal-to-liquid base oil adopted in the application has lower contents of sulfur, nitrogen, heavy metals and aromatic hydrocarbon and higher stability. Further preferably, the sulfur content in the coal-based oil base oil is not higher than 0.05wt%; still more preferably, the sulfur content in the coal-based oil base oil is no more than 0.01wt%; still more preferably, the sulfur content in the coal-derived oil is not more than 0.005 wt.%, and still more preferably, the result of the test according to industry standard SH/T0689 is "undetected".
The synthetic hydraulic oil can be used by adopting one kind of coal-based oil as base oil, or can be used by adopting two or more kinds of coal-based oils with different characteristics as the base oil after being mixed according to a certain proportion.
In some embodiments, the coal-to-oil base oil comprises a mixture of two coal-to-oil base oils having a number of carbon atoms from C7 to C28 and from C9 to C50; further, the kinematic viscosity of the mixture of the coal-to-liquid oil at 40 ℃ is 28-36 mm 2 /s。
Further, the coal-based oil base oil comprises a kinematic viscosity of 2.0-5 mm at 100 DEG C 2 Coal oil base oil A/s and a kinematic viscosity at 100 ℃ of 5 to 13mm 2 Coal-based oil base oil B/s.
Further, the coal-based oil base oil comprises a kinematic viscosity of 2.8-4 mm at 100 DEG C 2 Coal oil base oil A/s and a kinematic viscosity at 100 ℃ of 5-8 mm 2 Coal-based oil base oil B/s.
Further, the ratio of the coal-to-oil base oil A to the coal-to-oil base oil B is 10-20 weight parts of the coal-to-oil base oil A and 70-90 weight parts of the coal-to-oil base oil B.
Further, the kinematic viscosity of the coal-based oil base oil A at 100 ℃ is 2.8-3.2 mm 2 The kinematic viscosity at 40 ℃ is 11-12 mm 2 S, viscosity index is 120-125, pour point is-39-45 ℃, flash point is 202-218 ℃; the kinematic viscosity of the coal oil base oil B at 100 ℃ is 6-7 mm 2 The kinematic viscosity at 40 ℃ is 32-34 mm 2 And/s, viscosity index of 142-147, pour point of-39-45 deg.C and flash point of 242-258 deg.C.
The coal base oil of the present application may be commercially available products including, but not limited to, ICCDYN 3 and ICCDYN 6 from Shanxi Luffa England Lubricant Co.
The applicant found in the completion of the present application that when coal-derived oil with specific kinematic viscosity, viscosity index and other parameters is used as base oil, the obtained synthetic hydraulic oil has excellent viscosity-temperature performance, especially when the kinematic viscosity at 100 ℃ is 2.8-3.2 mm 2 Per second, the kinematic viscosity of the coal-to-liquid oil at 100 ℃ is 6-7 mm 2 After mixing according to a specific proportion, and compounding the components such as a specific polyacrylate viscosity index improver, a specific acrylate pour point depressant, a specific defoamer and the like, the low-temperature stability of the obtained synthetic oil is further improved, so that the synthetic oil can be widely applied to a high-precision wind power generation hydraulic system and can stably work in a harsher season.
The pour point depressant is a component which is favorable for lowering the solidifying point of hydraulic oil, refining wax crystals and improving the flow property of the hydraulic oil at low temperature. The specific component selection of the pour point depressant in the present application is not particularly limited, and includes, but is not limited to, polyacrylates, alkyl naphthalene compounds, etc., such as VISCOPLEX series from wining De solid race (china) investment limited, etc.
In some preferred embodiments, the synthetic hydraulic oils of the present application further comprise 0.4 to 2 wt.% of a multifunctional additive in order to provide better stability and longer service life.
Furthermore, the multifunctional additive is an antiwear hydraulic oil multifunctional additive and is prepared by adopting various additives such as antioxidant, antiwear and antirust agents.
Further, the kinematic viscosity of the multifunctional additive at 40 ℃ is typically 40-80 mm 2 /s。
Further, the multifunctional additive has a typical value of a kinematic viscosity of 45mm at 40 DEG C 2 /s。
Further, the sulfur content of the multifunctional additive is 12.0-18.0 wt% and the phosphorus content is 0.5-1.2 wt%; further, the sulfur content of the multifunctional additive is 13.5-17.3 wt% and the phosphorus content is 0.86-1.12 wt%.
By using the multifunctional additive, the synthetic hydraulic oil provided by the application has good antioxidant and antirust properties, better thermal stability and hydrolytic stability, good filterability and outstanding wear resistance, can prevent the abrasion of a hydraulic pump and other elements, and prolongs the service life of a wind power generation hydraulic system.
The specific choice of the multifunctional additive in the present application is not particularly limited, and includes, but is not limited to, hitec 525 of Equipped, etc.
In some preferred embodiments, the synthetic hydraulic oils of the present application further comprise 1 to 5 wt.% viscosity index improver in order to further improve their shear resistance and low temperature properties.
Further, the viscosity index improver is an acrylic polymer.
Further, the PSSI of the acrylic polymer is not higher than 50.
The term "PSSI" as used herein refers to a permanent shear stability index, which is an irreversible viscosity loss that represents the occurrence of a hydraulic oil during operation of a hydraulic system. In the present application, PSSI is not higher than 50, and is a parameter value obtained by dissolving 10.0% of the component in 100N mineral oil and testing under ultrasonic shearing condition by using ASTM D5621 test method.
Further, the typical value of the shear index (P-SSI) after 250 cycles tested according to DIN 51382 is 15.
Further, the kinematic viscosity of the acrylic polymer at 100 ℃ is 1500-1700 mm 2 /s。
The specific kind of the viscosity index improver is not particularly limited in the present application, and includes, but is not limited to, VISCOPLEX 8-409, VISCOPLEX 3-200, VISCOPLEX 7-303, etc. of German Sai (China) investment Co.
In order to make the synthetic hydraulic oil of the present application resistant to outgassing and demulsification, in some preferred embodiments, the synthetic hydraulic oil of the present application further comprises 50 to 2000ppm of an antifoaming agent. The specific kind of the antifoaming agent is not particularly limited in the present application, and includes, but is not limited to, polyacrylate type antifoaming agents such as ExxonMobil Mobilad C402 and the like.
As a preferred embodiment, the pour point of the synthetic hydraulic oil of the application is not higher than-25 ℃.
Further, the pour point of the synthetic hydraulic oil is not higher than-40 ℃.
Further, the pour point of the synthetic hydraulic oil is not higher than-45 ℃.
Further, the pour point of the synthetic hydraulic oil is not higher than-50 ℃.
Further, the synthetic hydraulic oil has a brookfield viscosity at-40 ℃ of no more than 25000cps.
Further, the synthetic hydraulic oil has a brookfield viscosity at-40 ℃ of no more than 20000cps.
Further, the synthetic hydraulic oil has a brookfield viscosity at-40 ℃ of no more than 15000cps.
Further, the synthetic hydraulic oil has a brookfield viscosity at-40 ℃ of no more than 12000cps.
Further, the kinematic viscosity of the synthetic hydraulic oil at 40 ℃ is 28-34 mm 2 /s。
Further, the viscosity index of the synthetic hydraulic oil is 150-190.
The second application of the present application provides a method for preparing the synthetic hydraulic oil as described above, comprising the steps of: the raw materials are added into a blending container according to the proportion, and then stirred and mixed for 1-2 hours at 55-65 ℃ to obtain the product.
A third aspect of the application provides the use of a synthetic hydraulic oil as described above for a hydraulic wind power system.
Compared with the prior art, the synthetic hydraulic oil for the wind power generation hydraulic system has the following beneficial effects Fruit set：
(1) The synthetic hydraulic oil of the application has excellent viscosity-temperature performance, the viscosity index is close to 175, and the kinematic viscosity at 40 ℃ is 28-36 mm 2 In the range of/s, the hydraulic system of the wind generating set can keep good lubrication, cooling and other performances within the temperature change range of about minus 50 ℃ to 55 ℃, and the defect of performance of the hydraulic system caused by the change of the system temperature when the wind generating set works around the clock is avoided.
(2) The synthetic hydraulic oil has lower pour point (the pour point is lower than-50 ℃) and the Brookfield viscosity (is lower than 11000 cps), can still keep good fluidity at the temperature of about minus 50 ℃, and effectively avoids the problems that the viscosity of the hydraulic oil is increased, the movement resistance of hydraulic components is increased, 3 blades of a hydraulic pitch fan are asynchronous in pitch change or the pitch change speed is slow due to low temperature when a wind power generation hydraulic system works in severe cold seasons.
(3) The synthetic hydraulic oil provided by the application does not use or uses a small amount of viscosity index improver, the viscosity-temperature performance of the hydraulic oil is improved, the shearing performance of the hydraulic oil is not sacrificed, the synthetic hydraulic oil can still keep very low irreversible viscosity loss in the use process, and the longer service life is ensured.
(4) The synthetic hydraulic oil has little content of heavy metals, nitrogen, sulfur and other components, almost has zero content and no obvious impurity, effectively avoids the problems of reduced flow and blockage of an oil way of hydraulic equipment, abrasion and failure of a sealing mechanical device and the like, and is widely applied to more precise original elements and systems.
(5) The synthetic hydraulic oil disclosed by the application adopts the compounded coal-based oil as the base oil, does not adopt the synthetic base oil with high production cost such as poly-alpha olefin and the like, realizes the excellent comprehensive performance, obviously reduces the cost and has obvious economic benefit.
Detailed Description
The technical features of the technical solution provided in the present application will be further clearly and completely described in connection with the detailed description below, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. The synthetic hydraulic oil is prepared by adding the components into a blending container according to the proportion and stirring for about 1.5 hours at 60 ℃.
Example 1: the embodiment provides synthetic hydraulic oil for a wind power generation hydraulic system, which is prepared from the following raw materials in parts by mass: 16.08 parts of coal-to-liquid base oil A, 80 parts of coal-to-liquid base oil B, 1.0 part of hydraulic oil multifunctional additive, 2.5 parts of polyacrylate viscosity index improver, 0.4 part of polyacrylate pour point depressant and 0.02 part of polyacrylate defoamer.
Wherein the coal-to-oil base oil a has typical physicochemical parameters as shown in table 1 below:
TABLE 1
| Parameter item | TestingResults | Test method |
| Appearance of | Clear and transparent | Visual inspection |
| Color (Sibert color number) | +30 | GB/T3555 |
| Density (20 ℃ C.) g/m 2 | 0.8077 | GB/T1884 |
| Kinematic viscosity (40 ℃ C.) mm 2 /s | 11.29 | GB/T265 |
| Kinematic viscosity (100 ℃ C.) mm 2 /s | 2.998 | GB/T265 |
| Viscosity index | 123 | GB/T1995 |
| Flash point (open) DEG C | 210 | GB/T3536 |
| Pour point, C | -42 | GB/T3535 |
| Sulfur content (mg/kg) | Not detected | SH/T0689 |
The coal-to-oil base oil B has typical physicochemical parameters as shown in table 2 below:
TABLE 2
| Parameter item | Test results | Test method |
| Appearance of | Clear and transparent | Visual inspection |
| Color (Sibert color number) | +30 | GB/T3555 |
| Density (20 ℃ C.) g/m 2 | 0.8203 | GB/T1884 |
| Kinematic viscosity (40 ℃ C.) mm 2 /s | 33.11 | GB/T265 |
| Kinematic viscosity (100 ℃ C.) mm 2 /s | 6.266 | GB/T265 |
| Viscosity index | 144 | GB/T1995 |
| Flash point (open) DEG C | 249 | GB/T3536 |
| Pour point, C | -42 | GB/T3535 |
| Sulfur content (mg/kg) | Not detected | SH/T0689 |
The multifunctional additive of the hydraulic oil is HITEC 525, the acrylic ester pour point depressant VISCOPLEX1-180, and the polyacrylate defoamer is Mobilad C402; the polymethacrylate viscosity index improver has typical physicochemical parameters as shown in table 3 below:
TABLE 3 Table 3
Example 2: the embodiment provides synthetic hydraulic oil, which is prepared from the following raw materials in percentage by mass: 14.58 parts of three types of base oil, 83 parts of three types of plus base oil, 1.0 part of hydraulic oil multifunctional additive and polymer1 part of acrylic ester sticking agent, 0.4 part of polyacrylate pour point depressant and 0.02 part of polyacrylate defoamer; wherein the three base oils adopt Yubase 3 with viscosity of 3.3mm at 100deg.C 2 S, viscosity index 107; the three types of base oil adopt Abu Dhabi 6cst, the viscosity at 100 ℃ is 6.2mm < 2 >/s, and the viscosity index is 135; the hydraulic oil multifunctional additive adopts HITEC 525; the polyacrylate finger sticking agent adopts VISCOPLEX 11-219; the polyacrylate pour point depressant adopts VISCOPLEX 1-180; the polyacrylate defoamer adopts Mobilad C402.
Example 3: the embodiment provides synthetic hydraulic oil, which is prepared from the following raw materials in percentage by mass: 16.08 parts of three types of base oil, 80 parts of coal-to-liquid base oil, 1.0 part of hydraulic oil multifunctional additive, 2.5 parts of polyacrylate finger sticking agent, 0.4 part of polyacrylate pour point depressant and 0.02 part of polyacrylate defoamer; wherein the three base oils adopt Yubase 3 with viscosity of 3.3mm at 100deg.C 2 S, viscosity index 107; the hydraulic oil multifunctional additive adopts HITEC 525; the polyacrylate pour point depressant adopts VISCOPLEX 1-360; the polyacrylate defoamer adopts Mobilad C402; the coal-to-liquids base oil has typical physicochemical parameters as shown in table 4 below:
TABLE 4 Table 4
| Parameter item | Test results | Test method |
| Appearance of | Clear and transparent | Visual inspection |
| Color of(Sibert color number) | +30 | GB/T3555 |
| Density (20 ℃ C.) g/m 2 | 0.8203 | GB/T1884 |
| Kinematic viscosity (40 ℃ C.) mm 2 /s | 33.11 | GB/T265 |
| Kinematic viscosity (100 ℃ C.) mm 2 /s | 6.266 | GB/T265 |
| Viscosity index | 144 | GB/T1995 |
| Flash point (open) DEG C | 249 | GB/T3536 |
| Pour point, C | -42 | GB/T3535 |
| Sulfur content (mg/kg) | Not detected | SH/T0689 |
The polyacrylate viscosity index improver has typical physicochemical parameters as shown in table 5 below:
TABLE 5
The applicant carried out the tests of kinematic viscosity, viscosity index, pour point, etc. on the synthetic hydraulic oil components of the above examples according to the contents of the national standards GB/T265, GB/T1995, GB/T3535, the test results of which are shown in Table 6 below:
TABLE 6
| Component (A) | Example 1 | Example 2 | Example 3 |
| Kinematic viscosity (40 ℃ C.) mm 2 /s | 31.945 | 29.033 | 31.87 |
| Viscosity index | 174 | 146 | 169 |
| Pour point, C | -51 | -36 | -48 |
| Brinell viscosity at-40 DEG C | 10338 | 30768 | 26294 |
The operations and steps disclosed in the embodiments of the present application relate to portions specific to the present application, and other steps may be performed according to operations well known to those skilled in the art.
The above description is only of the preferred embodiments of the present application, and is not intended to limit the present application in any way; the embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict. Equivalent embodiments of the present application will be apparent to those skilled in the art to which the present application pertains, upon consideration of the following detailed description of the present application with reference to the figures appended hereto.
Claims (3)
1. The synthetic hydraulic oil is characterized by being prepared from the following raw materials in parts by weight: 16.08 parts of coal-to-liquid base oil A, 80 parts of coal-to-liquid base oil B, 1.0 part of hydraulic oil multifunctional additive, 2.5 parts of polyacrylate viscosity index improver, 0.4 part of polyacrylate pour point depressant and 0.02 part of polyacrylate defoamer;
the kinematic viscosity of the coal tar oil A at 100 ℃ is 2.8-3.2 mm 2 The kinematic viscosity at 40 ℃ is 11-12 mm 2 The viscosity index is 120-125, the pour point is-39 to-45 ℃, and the flash point is 202-218 ℃; the kinematic viscosity of the coal oil base oil B at 100 ℃ is 6-7 mm 2 The kinematic viscosity at 40 ℃ is 32-34 mm 2 S, wherein the viscosity index is 142-147, the pour point is-39 to-45 ℃, and the flash point is 242-258 ℃;
the typical value of the kinematic viscosity of the hydraulic oil multifunctional additive at 40 ℃ is 45mm 2 /s；
The sulfur content of the hydraulic oil multifunctional additive is 12.0-18.0wt% and the phosphorus content is 0.5-1.2wt%;
the pour point of the synthetic hydraulic oil is-51 ℃;
the brookfield viscosity of the synthetic hydraulic oil at-40 ℃ is 10338cps;
the multifunctional additive of the hydraulic oil is HITEC 525, the polyacrylate pour point depressant is VISCOPLEX1-180, and the polyacrylate defoamer is Mobilad C402; the kinematic viscosity of the polyacrylate viscosity index improver at 100 ℃ is 1600 mm 2 And/s, which gives a typical value of 15 for shear index after 250 cycles tested according to DIN 51382 and a flash point of 120 ℃.
2. The method for preparing synthetic hydraulic oil according to claim 1, characterized in that it comprises the steps of: and adding the raw materials into a blending container according to the proportion, and stirring and mixing at 55-65 ℃ for 1-2 hours to obtain the modified starch.
3. The use of a synthetic hydraulic oil according to claim 1, characterized in that the synthetic hydraulic oil is applied in a hydraulic wind power system.
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| US6627584B2 (en) * | 2002-01-28 | 2003-09-30 | Ethyl Corporation | Automatic transmission fluid additive comprising reaction product of hydrocarbyl acrylates and dihydrocarbyldithiophosphoric acids |
| US8022024B2 (en) * | 2007-06-28 | 2011-09-20 | Chevron U.S.A. Inc. | Functional fluid compositions |
| US8278255B2 (en) * | 2008-03-31 | 2012-10-02 | Holt David G L | Unexpected shear stability benefits of synthetic oils and viscosity modifier combinations |
| CN107541319B (en) * | 2017-09-06 | 2020-07-17 | 浙江顶嘉新材料科技有限公司 | High-viscosity-index low-pour-point ashless hydraulic oil and preparation method thereof |
| CN112430492A (en) * | 2019-08-26 | 2021-03-02 | 中国石油化工股份有限公司 | Special hydraulic oil composition for high-efficiency energy-saving injection molding machine |
| CN111019743A (en) * | 2019-11-15 | 2020-04-17 | 山西潞安矿业(集团)有限责任公司 | Coal-based total-synthesis low-temperature hydraulic oil and preparation method thereof |
| CN111234907B (en) * | 2020-01-21 | 2023-03-17 | 西安航天动力试验技术研究所 | Coal-based fully-synthetic SN-grade lubricating oil and preparation method thereof |
| CN112940829B (en) * | 2021-02-01 | 2023-02-28 | 国家能源集团宁夏煤业有限责任公司 | Antiwear hydraulic oil and preparation method thereof |
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| EP0338311A1 (en) * | 1988-04-05 | 1989-10-25 | Nippon Oil Co. Ltd. | Oil composition containing hydrogenated oil |
| US5015404A (en) * | 1988-04-05 | 1991-05-14 | Nippon Oil Co., Ltd. | Oil composition containing hydrogenated oil |
| CN106047329A (en) * | 2016-06-06 | 2016-10-26 | 中国石油化工股份有限公司 | High-temperature-resistant pour-point depressant and preparation method thereof |
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