A method for selecting and formulating a grease and specific additives for a hydraulic braking system.

Abstract

This invention provides a method for selecting and compounding hydraulic braking system greases and their specific additives. The method includes the following steps: S1, Data Acquisition: Acquiring component data and performance data; the specific additives include chemical stabilizers, antioxidants, and high-temperature stabilizers; S2, Model Building: Based on the component data and performance data, establishing a predictive model between the comprehensive index of the grease and the mass percentages of chemical stabilizers, antioxidants, and high-temperature stabilizers in the hydraulic braking system grease; S3, Optimization and Screening: Based on commonly used ranges of the mass percentages of chemical stabilizers, antioxidants, and high-temperature stabilizers, substituting multiple groups of chemical stabilizers, antioxidants, and high-temperature stabilizers with different mass percentages into the predictive model for calculation, and selecting the combination with the larger comprehensive index of the grease as the preferred formulation for the specific additives. This method is highly efficient and can meet the requirements for rapid adaptability of specific additives in greases under the current situation of rapid vehicle model iteration.

Description

Technical Field

[0001] This invention relates to the field of grease preparation technology, and in particular to a method for selecting and compounding a grease for a hydraulic braking system and specific additives thereof. Background Technology

[0002] Hydraulic braking system greases must possess excellent chemical stability and anti-wear properties under high temperature, high pressure, and high humidity environments. They are mainly used for friction reduction, lubrication, and sealing between the rubber cups (PDEM) and cylinder walls in automotive hydraulic braking systems. They require that the contact rubber does not expand or contract, have good compatibility with brake fluid, and have a long lubrication life.

[0003] The main properties of hydraulic braking system grease include eight aspects: thixotropy, viscosity, strength limit, low-temperature fluidity, dropping point, volatility, colloidal stability, and oxidation stability. In addition to basic additives such as rust inhibitors, corrosion inhibitors, oiliness agents, and thickeners, it also contains specific additives such as chemical stabilizers, antioxidants, and high-temperature stabilizers. The synergistic effect of these specific additives plays a crucial role in the overall performance of the grease.

[0004] Currently, the specific additive components in hydraulic braking system greases suitable for different vehicle conditions are generally obtained through durability testing. This involves exhaustively testing various potentially applicable additives in different proportions to find the specific additive suitable for particular vehicle conditions. This selection method is time-consuming, costly, and inefficient. For rapidly evolving vehicle models, it is difficult to quickly match suitable grease additive formulations, failing to meet the rapid adaptability requirements of grease additives under the current situation of rapid vehicle model iteration.

[0005] Therefore, this invention is proposed. Summary of the Invention

[0006] This invention provides a method for selecting and matching lubricating grease and its specific additives for hydraulic braking systems. This method is highly efficient and can meet the requirements for rapid compatibility of specific additives in lubricating grease under the current situation of rapid vehicle model iteration.

[0007] This invention provides a method for selecting specific additives in the lubricating grease of a hydraulic braking system, comprising the following steps: S1. Data Acquisition: Obtain historical component data on the mass percentage of basic additives and specific additives in the additives of the hydraulic braking system grease; determine at least one physical property of the basic additives and specific additives that affect the hydraulic braking system grease; and obtain performance data; the specific additives include chemical stabilizers, antioxidants, and high-temperature stabilizers. S2. Model Construction: Based on the component data and performance data, a predictive model is established between the comprehensive index of the lubricating grease and the mass percentage of chemical stabilizers, antioxidants and high-temperature stabilizers in the lubricating grease of the hydraulic braking system. S3. Optimization and Screening: Based on the commonly used range values ​​of the mass percentage of chemical stabilizers, antioxidants, and high-temperature stabilizers, multiple groups of chemical stabilizers, antioxidants, and high-temperature stabilizers with different mass percentages are substituted into the prediction model for calculation, and the combination with the larger comprehensive index of the lubricating grease is selected as the preferred formulation for specific additives.

[0008] This selection method is based on historical data of existing hydraulic braking system greases. It establishes a predictive model between the comprehensive index of the grease and the mass percentage of chemical stabilizers, antioxidants and high-temperature stabilizers in the hydraulic braking system grease. This model can quickly screen out the specific additive components corresponding to the optimal comprehensive performance, thus achieving the goal of quickly selecting specific additives for hydraulic braking system greases under the current situation of rapid vehicle model iteration.

[0009] The mass percentage refers to the percentage of the mass of the basic additive and the specific additive in the total mass of the additive.

[0010] Further, in step S3, the commonly used range for the mass percentage of the chemical stabilizer is 1.36-26.50%, and / or the commonly used range for the mass percentage of the antioxidant is 1.14-10.80%, and / or the commonly used range for the mass percentage of the high-temperature stabilizer is 1.57-28.00%.

[0011] Preferably, the chemical stabilizer includes at least one of lithium stearate, lithium 12-hydroxystearate, lead stearate, polyoxyethylene ether, and polyoxyethylene ether stearate.

[0012] Preferably, the antioxidant includes at least one of bisphenol A, trimethylphenol, zinc dipropyl sulfide, and dipropyl dithiophosphate.

[0013] Preferably, the high-temperature stabilizer includes at least one of calcium stearate, fluoride, and calcium sulfonate.

[0014] Further, in step S1, at least one basic physical property of the basic additive affecting the lubricating grease of the hydraulic braking system and at least one key physical property of the specific additive affecting the lubricating grease of the hydraulic braking system are determined, and basic performance data and key performance data are obtained respectively.

[0015] Preferably, the key physical properties consist of colloidal stability and oxidative stability.

[0016] Preferably, the basic additives include at least one of rust inhibitors, corrosion inhibitors, oiliness agents, and thickeners, and the basic physical properties include at least one of thixotropy, viscosity, strength limit, low-temperature fluidity, dropping point, and evaporation.

[0017] Preferably, the rust inhibitor includes at least one of barium petroleum sulfonate, zinc naphthenate, and calcium sulfonate.

[0018] Preferably, the preservative includes at least one of barium sulfonate, calcium sulfonate, modified calcium sulfonate, borate amine, and carboxylic amine.

[0019] Preferably, the oiling agent includes at least one of palmitic acid, oleic acid, butyl stearate, lauryl phosphate, and oleoyl phosphate.

[0020] Preferably, the thickener includes at least one of polyacrylate, polyurethane, polymethylsiloxane, and polyphenylsiloxane.

[0021] Further, step S2 includes: (1) The component data, basic performance data and key performance data are made dimensionless to obtain dimensionless basic performance, dimensionless colloidal stability and dimensionless oxidative stability. The dimensionless basic performance includes at least one of dimensionless thixotropy, dimensionless viscosity, dimensionless strength limit, dimensionless low temperature fluidity, dimensionless dropping point and dimensionless evaporation. (2) Establish a model IV showing the relationship between dimensionless basic properties and the mass percentage of rust inhibitors, corrosion inhibitors, oiliness agents, and thickeners; (3) Establish Model I, which establishes the relationship between dimensionless colloidal stability and the mass percentage of chemical stabilizers; (4) Establish Model II for the relationship between dimensionless oxidative stability and the mass percentage of antioxidants; (5) Establish the prediction model based on relation model I and relation model II.

[0022] Furthermore, the relationship model I is: L = Z × a, where L is the dimensionless colloidal stability, Z is the dimensionless comprehensive performance, and a is the mass percentage of chemical stabilizer in the additives of the hydraulic braking system grease.

[0023] Furthermore, the relationship model II is: M = Z × b, where M is the dimensionless oxidation stability, Z is the dimensionless comprehensive performance, and b is the mass percentage of antioxidant in the additive of the hydraulic braking system grease.

[0024] Further, in step (5), the dimensionless comprehensive performance Z of the hydraulic braking system grease is described according to the relational model III of Z=(J+L+M)×1.01×(1+c), and the relational models I~III are decoupled to obtain the prediction model, which is: Z / J=[1.05×(1+c)×1.01] / [1-1.05×(1+c)×1.01×(a+b)].

[0025] In the aforementioned relational model III, Z represents dimensionless comprehensive performance, J represents dimensionless basic performance, L represents dimensionless colloidal stability, M represents dimensionless colloidal stability, and c represents the mass percentage of high-temperature stabilizer in the additives of the hydraulic braking system grease.

[0026] In the prediction model, Z represents the dimensionless comprehensive performance, J represents the dimensionless basic performance, Z / J represents the comprehensive index of the grease, a represents the mass percentage of chemical stabilizers in the additives of the hydraulic braking system grease, b represents the mass percentage of antioxidants in the additives of the hydraulic braking system grease, and c represents the mass percentage of high-temperature stabilizers in the additives of the hydraulic braking system grease. Preferably, J is calculated according to the relational model IV, which is: J = 1000 × 1.13 × d + 2000 × e + 1000 × 1.13 × f + 400 × 1.065 × g; In the relationship model IV, d is the mass percentage of rust inhibitor in the additives of the hydraulic braking system grease, e is the mass percentage of corrosion inhibitor in the additives of the hydraulic braking system grease, f is the mass percentage of oiliness agent in the additives of the hydraulic braking system grease, and g is the mass percentage of thickener in the additives of the hydraulic braking system grease.

[0027] Specifically, in the selection of grease, this invention utilizes historical test data (composition data, basic performance data, and key performance data). Based on the empirical weights and performance index values ​​of each performance indicator, a dimensionless relationship is established using a least squares model to represent the comprehensive performance, basic performance, and oxidative stability of the hydraulic braking system grease. The data is then dimensionless to obtain dimensionless basic performance, dimensionless colloidal stability, and dimensionless oxidative stability. Basic performance data refers to test data collected during the application of the hydraulic braking system grease, such as 1 / 4 working cone penetration (thixotropy), dropping point, similar viscosity, and free organic acid content (oxidative stability). Key performance data refers to the oil separation on a steel mesh (40℃, 24h) (colloidal stability) and evaporation rate (evaporability) collected during the application of the hydraulic braking system grease.

[0028] Further, in step S3, components with a comprehensive index of 1.1 or higher and a relatively large comprehensive index are selected as the preferred formulation of the additive.

[0029] The present invention also provides a method for selecting a formulation of a hydraulic braking system grease, wherein the hydraulic braking system grease contains additives, the additives including the base additives and the specific additives, and the formulation of the specific additives is obtained by the selection method described above.

[0030] This invention also provides a hydraulic braking system grease containing additives. The additives include the base additives and specific additives obtained by the selection method described above, or prepared using the selection method described above. The mass percentages a of the chemical stabilizer, b of the antioxidant, and c of the high-temperature stabilizer in the additives of the hydraulic braking system grease must meet the following conditions: (1) 1.36%≤a≤26.50%, 1.14%≤b≤10.80%, 1.57%≤c≤28.00%; (2) [1.05×(1+c)×1.01] / [1-1.05×(1+c)×1.01×(a+b)]≥1.1.

[0031] The beneficial effects of the method for selecting and matching hydraulic braking system grease and its specific additives provided by this invention are as follows: This invention establishes a relationship between the dimensionless comprehensive performance Z of hydraulic braking system grease and its dimensionless basic performance J, the mass percentage a of chemical stabilizer, the mass percentage b of antioxidant, and the mass percentage c of high-temperature stabilizer. By substituting commonly used solutions, this selection and matching method is highly efficient and can quickly obtain the specific additive components corresponding to the optimal dimensionless comprehensive performance of hydraulic braking system grease, meeting the requirements for rapid adaptability of specific additives for grease under the current situation of rapid vehicle model iteration. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a graph of Z / J from Example 1; Figure 2 This is a graph of Z / J in Example 2. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0036] The raw material information used in the following examples is as follows: Rust inhibitor: Zinc naphthenate.

[0037] Preservative: Calcium sulfonate.

[0038] Oiliness agent: Butyl stearate.

[0039] Thickener: Polymethylsiloxane.

[0040] Chemical stabilizer: lead stearate.

[0041] Antioxidant: Diphenol propane.

[0042] High-temperature stabilizer: calcium stearate.

[0043] The eight main properties of lubricating grease are as follows: 1. Thixotropy The most fundamental characteristic of lubricating grease is thixotropy. When an external force is applied, the flow of lubricating grease gradually softens, exhibiting a decrease in viscosity. However, once it is at rest, after a short period of time, its consistency increases again (recovers), a phenomenon known as thixotropy. Thixotropy of lubricating grease is usually measured by its consistency, also known as the cone penetration index. This characteristic of lubricating grease allows it to be used in areas unsuitable for lubrication by oil (such as areas where oil is prone to leakage), where it demonstrates excellent performance.

[0044] 2. Viscosity Lubricating greases are typically expressed using apparent viscosity or similar viscosity. When describing the viscosity of a grease, temperature and shear rate must be specified. Similar viscosity indices can be used to control its low-temperature flowability and pumpability. Viscosity and strength limits reflect the non-Newtonian fluid characteristics of greases, meaning their flowability varies with shear rate.

[0045] The viscosity of grease is usually expressed as apparent viscosity or similar viscosity. When describing the viscosity of grease, temperature and shear rate must be specified. Similar viscosity index can be used to control its low-temperature fluidity and pumpability.

[0046] The ultimate tensile strength of a grease refers to the minimum shear stress required to initiate flow in a grease sample; it is also known as the ultimate shear stress. The ultimate tensile strength of a grease is a function of temperature; the higher the temperature, the lower the ultimate tensile strength, and vice versa. Its magnitude depends on the type and content of the thickener, and is also related to the manufacturing process. The ultimate tensile strength of a grease has significant practical importance: a certain strength limit prevents it from leaking from lubricated parts; however, an excessively high strength limit can cause difficulty in starting the lubricated machinery or lead to excessive energy consumption.

[0047] 3. Ultimate Strength The ultimate tensile strength of a grease is the minimum shear stress required to initiate flow of a sample, also known as the limiting shear stress. The ultimate tensile strength of a grease is a function of temperature. Higher temperatures result in a lower ultimate tensile strength, while lower temperatures result in a higher ultimate tensile strength. Its magnitude depends on the type and amount of thickener, and is also related to the grease preparation process conditions.

[0048] 4. Low-temperature fluidity One of the important indicators for measuring the low-temperature performance of grease is low-temperature torque, which is the degree to which the grease resists the rotation of a low-speed flowing bearing at low temperatures (below -20℃). The low-temperature torque of grease is represented by the average of the starting torque and the torque after rotating 60mm.

[0049] 5. Dropping point The lowest temperature at which a grease achieves a certain fluidity under specified conditions is called its dropping point. The dropping point of a grease helps identify its type and provides a rough estimate of its maximum operating temperature. Generally, soap-based greases should be used at temperatures 20-30°C below their dropping point.

[0050] 6. Evaporability The volatility of grease indicates that the lower the volatility of the grease during long-term use at high temperatures, the better. The evaporation of grease mainly depends on the properties and fraction of the lubricating oil.

[0051] 7. Colloidal stability The colloidal stability of grease refers to its ability to maintain a stable colloidal structure under certain temperature and pressure conditions, preventing precipitation and separation of the grease; in other words, its resistance to oil separation. The amount of oil separated from the grease is usually converted into a mass fraction. The colloidal stability of grease reflects its tendency to separate oil during long-term storage and practical application. If the colloidal stability of the grease is poor, severe oil separation can easily occur under heating, pressure, and centrifugal force, leading to a rapid shortening of its service life, thickening and drying out, and loss of lubrication.

[0052] 8. Oxidative stability Oxidative stability refers to the ability of a grease to resist thermal oxidation during long-term storage or use at prolonged high temperatures, maintaining its properties without permanent changes. Oxidation leads to a decrease in free alkali content or an increase in free organic acid content, resulting in a lower dropping point, darker appearance, off-odors, changes in consistency and strength limits, a decrease in similar viscosity, the formation of corrosive products and substances that damage the grease structure, and ultimately, soap-oil separation. Therefore, during long-term storage, greases should be stored in a dry, well-ventilated environment, protected from direct sunlight, and their free alkali or free organic acid content, corrosiveness, and other parameters should be checked regularly to ensure their quality and performance.

[0053] A method for selecting specific additives in a hydraulic braking system grease includes the following steps: S1. Data Acquisition: Obtain historical component data for the mass percentage of basic additives and specific additives in the additives of hydraulic braking system grease. Determine the basic physical properties (thixotropy, viscosity, strength limit, low temperature fluidity, dropping point, and evaporation) of basic additives (rust inhibitors, corrosion inhibitors, oiliness agents, and thickeners) that affect the hydraulic braking system grease, and the key physical properties (colloidal stability and oxidation stability) of specific additives (chemical stabilizers, antioxidants, and high temperature stabilizers) that affect the hydraulic braking system grease. Obtain basic performance data and key performance data respectively.

[0054] S2. Model Construction: Based on the component and performance data, establish a predictive model between the comprehensive index of the lubricating grease and the mass percentages of chemical stabilizers, antioxidants, and high-temperature stabilizers in the lubricating grease of the hydraulic braking system; the specific operation is as follows: (S21) The component data, basic performance data and key performance data are made dimensionless to obtain dimensionless basic performance J, dimensionless colloidal stability L and dimensionless oxidative stability M; (S22) Establish model IV to establish the relationship between dimensionless basic properties and the mass percentage of rust inhibitors, corrosion inhibitors, oiliness agents, and thickeners; The relational model IV is: J = 1000 × 1.13 × d + 2000 × e + 1000 × 1.13 × f + 400 × 1.065 × g; In the aforementioned relational model IV, d represents the mass percentage of rust inhibitor in the additives of the hydraulic braking system grease, e represents the mass percentage of corrosion inhibitor in the additives of the hydraulic braking system grease, f represents the mass percentage of oiliness agent in the additives of the hydraulic braking system grease, and g represents the mass percentage of thickener in the additives of the hydraulic braking system grease. (S23) Establish Model I, which establishes the relationship between dimensionless colloidal stability and the mass percentage of chemical stabilizers; The relationship model I is: L = Z × a, where L is the dimensionless colloidal stability, Z is the dimensionless comprehensive performance, and a is the mass percentage of chemical stabilizer in the additives of the hydraulic braking system grease. (S24) Establish Model II for the relationship between dimensionless oxidative stability and the mass percentage of antioxidants; The relationship model II is: M = Z × b, where M is the dimensionless oxidation stability, Z is the dimensionless comprehensive performance, and b is the mass percentage of antioxidant in the additive of the hydraulic braking system grease. (S25) Establish the prediction model based on relational model I and relational model II: describe the dimensionless comprehensive performance Z of the hydraulic braking system grease according to relational model III, Z=(J+L+M)×1.01×(1+c), and decouple relational models I~III to obtain the prediction model, which is: Z / J=[1.05×(1+c)×1.01] / [1-1.05×(1+c)×1.01×(a+b)]; In the aforementioned relational model III, Z represents dimensionless comprehensive performance, J represents dimensionless basic performance, L represents dimensionless colloidal stability, M represents dimensionless colloidal stability, and c represents the mass percentage of high-temperature stabilizer in the additives of the hydraulic braking system grease. In the prediction model, Z represents the dimensionless comprehensive performance, J represents the dimensionless basic performance, Z / J represents the comprehensive index of the grease, a represents the mass percentage of chemical stabilizers in the additives of the hydraulic braking system grease, b represents the mass percentage of antioxidants in the additives of the hydraulic braking system grease, and c represents the mass percentage of high-temperature stabilizers in the additives of the hydraulic braking system grease.

[0055] S3. Optimization and Screening: Based on the commonly used range values ​​of the mass percentage of chemical stabilizers, antioxidants, and high-temperature stabilizers, multiple groups of chemical stabilizers, antioxidants, and high-temperature stabilizers with different mass percentages are substituted into the prediction model for calculation, and the combination with the larger comprehensive index (Z / J) of the lubricating grease is selected as the preferred formulation for the specific additive.

[0056] Example 1 This embodiment describes a method for selecting specific additives in the lubricating grease of a passenger vehicle's hydraulic braking system. For a group of commonly used hydraulic braking system lubricating greases with specific additive schemes as shown in Table 1, the main components of the specific additives in the hydraulic braking system lubricating grease can be quickly obtained using the prediction model of this invention: Z / J=[1.05×(1+c)×1.01] / [1-1.05×(1+c)×1.01×(a+b)] and J=1000×1.13×d+2000×e+1000×1.13×f+400×1.065×g.

[0057] In this embodiment, the chemical stabilizer is lead stearate, with a mass percentage a ranging from 1.36% to 26.50%; the antioxidant is bisphenol A propane, with a mass percentage b ranging from 1.14% to 10.80%; the high-temperature stabilizer is calcium stearate, with a mass percentage c ranging from 1.57% to 28.00%; the rust inhibitor is zinc naphthenate, with a mass percentage d of 1%; the corrosion inhibitor is calcium sulfonate, with a mass percentage e of 0.1%; the oiliness agent is butyl stearate, with a mass percentage f of 0.1%; and the thickener is polymethylsiloxane, with a mass percentage g of 10%.

[0058] The value of J is calculated to be 85.2 using the formula J = 1000 × 1.13 × d + 2000 × e + 1000 × 1.13 × f + 400 × 1.065 × g. Substitute the mass percentages of chemical stabilizers (a), antioxidants (b), and high-temperature stabilizers (c) corresponding to the 25 schemes in Table 1, along with the dimensionless basic performance J, into equation I: Z = [1.05×(1+c)×1.01×J] / [1-1.05×(1+c)×1.01×(a+b)], calculate Z / J, and obtain the Z / J curve (e.g., ...). Figure 1 (As shown).

[0059] Depend on Figure 1 Option 20 can be quickly selected as the first preferred option and option 7 as the second preferred option. The optimal option for specific additives in the grease of this hydraulic braking system is: chemical stabilizer (lead stearate) 26.50%, antioxidant (diphenol propane) 3.23%, and high temperature stabilizer (calcium stearate) 5.77%.

[0060] This embodiment uses the specific additive composition from Scheme 20 and the corresponding basic additive composition to prepare a hydraulic braking system grease. The performance of the hydraulic braking system grease prepared using the specific additives selected in this embodiment is verified. The performance indicators of the grease prepared with the specific additives from Scheme 20 are as follows: cone penetration, 0.1 mm, 325; dropping point, 200℃; stencil oil separation (40℃, 18h), 0.5% (m / m); evaporation rate (150℃, 1h), 3% (m / m); similar viscosity (-40℃, 10s). -1 The chemical stability (at 0.78 MPa oxygen pressure, 100°C, 100 h) is 1250 Pa·s; the pressure drop is 0.04 MPa. The method proposed in this invention meets the requirements for rapid selection and use of specific additives in the preparation of grease for hydraulic braking systems under high-mobility environmental conditions. The resulting grease meets all performance indicators required for hydraulic braking systems under high-mobility environmental conditions.

[0061] Example 2 This embodiment describes a method for selecting specific additives in the lubricating grease of a commercial vehicle's hydraulic braking system. Using the specific additive schemes for a group of commonly used hydraulic braking system lubricating greases shown in Table 2, the main components of the specific additives in the hydraulic braking system lubricating grease can be quickly obtained according to the prediction model of this invention: Z / J=[1.05×(1+c)×1.01] / [1-1.05×(1+c)×1.01×(a+b)] and J=1000×1.13×d+2000×e+1000×1.13×f+400×1.065×g.

[0062] In this embodiment, the chemical stabilizer is lead stearate, with a mass percentage (a) ranging from 1.61% to 12.68%; the antioxidant is bisphenol A propane, with a mass percentage (b) ranging from 1.39% to 8.43%; the high-temperature stabilizer is calcium stearate, with a mass percentage (c) ranging from 1.80% to 18.06%; the rust inhibitor is zinc naphthenate, with a mass percentage (d) of 2%; the corrosion inhibitor is calcium sulfonate, with a mass percentage (e) of 0.1%; the oiliness agent is butyl stearate, with a mass percentage (f) of 0.1%; and the thickener is polymethylsiloxane, with a mass percentage (g) of 7.5%.

[0063] The value of J is calculated as 85.85 using the formula J = 1000 × 1.13 × d + 2000 × e + 1000 × 1.13 × f + 400 × 1.065 × g. (4) Substitute the mass percentages of chemical stabilizers (a), antioxidants (b), high-temperature stabilizers (c), and dimensionless basic performance (J) corresponding to the 25 schemes in Table 2 into the relation I: Z = [1.05×(1+c)×1.01×J] / [1-1.05×(1+c)×1.01×(a+b)], calculate Z / J, and obtain the curve of Z / J (e.g., Figure 1 (As shown).

[0064] Depend on Figure 2 Option 18 can be quickly selected as the first preferred option and option 14 as the second preferred option. The optimal option for specific additives in the grease of the hydraulic braking system is: chemical stabilizer (lead stearate) 8.43%, antioxidant (diphenol propane) 3.28%, and high temperature stabilizer (calcium stearate) 18.06%.

[0065] This embodiment uses the specific additive composition from Scheme 18 and the corresponding basic additive composition to prepare a hydraulic braking system grease. The performance of the hydraulic braking system grease prepared using the specific additives selected in this embodiment is verified. The performance indicators of the grease prepared with the specific additives from Scheme 18 are as follows: 1 / 4 working cone penetration, 0.1 mm, 78°C; dropping point, 201°C; stencil oil separation (40°C, 24h), 0.25% (m / m); evaporation rate (150°C, 1h), 0.93% (m / m); similar viscosity (-30°C, 10s). -1 The chemical stability (at 0.78 MPa oxygen pressure, 100°C, 100 h) is 900 Pa·s; the pressure drop is 0.03 MPa. The method proposed in this invention meets the requirements for rapid selection and use of specific additives in the preparation of grease for hydraulic braking systems under high-mobility environmental conditions. The resulting grease meets all performance indicators required for hydraulic braking systems under high-mobility environmental conditions.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of selecting specific additives for a hydraulic brake system grease, characterized in that, Includes the following steps: S1. Data Acquisition: Obtain historical component data on the mass percentage of basic additives and specific additives in the additives of the hydraulic braking system grease; determine at least one physical property of the basic additives and specific additives that affect the hydraulic braking system grease; and obtain performance data; the specific additives include chemical stabilizers, antioxidants, and high-temperature stabilizers. S2. Model Construction: Based on the component data and performance data, a predictive model is established between the comprehensive index of the lubricating grease and the mass percentage of chemical stabilizers, antioxidants and high-temperature stabilizers in the lubricating grease of the hydraulic braking system. S3. Optimization and Screening: Based on the commonly used range values ​​of the mass percentage of chemical stabilizers, antioxidants, and high-temperature stabilizers, multiple groups of chemical stabilizers, antioxidants, and high-temperature stabilizers with different mass percentages are substituted into the prediction model for calculation, and the combination with the larger comprehensive index of the lubricating grease is selected as the preferred formulation for specific additives.

2. The method of selecting specific additives in a hydraulic brake system grease according to claim 1, characterized in that, In step S3, the commonly used range for the mass percentage of the chemical stabilizer is 1.36-26.50%, and / or the commonly used range for the mass percentage of the antioxidant is 1.14-10.80%, and / or the commonly used range for the mass percentage of the high-temperature stabilizer is 1.57-28.00%. Preferably, the chemical stabilizer comprises at least one of lithium stearate, lithium 12-hydroxystearate, lead stearate, polyoxyethylene ether, and polyoxyethylene ether stearate. Preferably, the antioxidant includes at least one of bisphenol A, trimethylphenol, zinc dipropyl sulfide, and dipropyl dithiophosphate; Preferably, the high-temperature stabilizer includes at least one of calcium stearate, fluoride, and calcium sulfonate.

3. The method of selecting specific additives in a hydraulic brake system grease according to claim 1 or 2, characterized in that, In step S1, at least one basic physical property of the basic additive affecting the lubricating grease of the hydraulic braking system and at least one key physical property of the specific additive affecting the lubricating grease of the hydraulic braking system are determined, and basic performance data and key performance data are obtained respectively. Preferably, the key physical properties consist of colloidal stability and oxidative stability; Preferably, the basic additives include at least one of rust inhibitors, corrosion inhibitors, oiliness agents, and thickeners, and the basic physical properties include at least one of thixotropy, viscosity, strength limit, low-temperature fluidity, dropping point, and evaporation. Preferably, the rust inhibitor includes at least one of barium petroleum sulfonate, zinc naphthenate, and calcium sulfonate; Preferably, the preservative includes at least one of barium sulfonate, calcium sulfonate, modified calcium sulfonate, borate amine, and carboxylic amine; Preferably, the oiling agent includes at least one of palmitic acid, oleic acid, butyl stearate, lauryl phosphate, and oleoyl phosphate. Preferably, the thickener includes at least one of polyacrylate, polyurethane, polymethylsiloxane, and polyphenylsiloxane.

4. The method of selecting specific additives in a hydraulic brake system grease according to claim 3, characterized in that, Step S2 includes: (1) The component data, basic performance data and key performance data are dimensionless to obtain dimensionless basic performance, dimensionless colloidal stability and dimensionless oxidative stability; (2) Establish a model IV showing the relationship between dimensionless basic properties and the mass percentage of rust inhibitors, corrosion inhibitors, oiliness agents, and thickeners; (3) Establish Model I, which establishes the relationship between dimensionless colloidal stability and the mass percentage of chemical stabilizers; (4) Establish Model II for the relationship between dimensionless oxidative stability and the mass percentage of antioxidants; (5) Establish the prediction model based on relation model I and relation model II.

5. The method of selecting specific additives in a hydraulic brake system grease according to claim 4, characterized in that, The relationship model I is: L = Z × a, where L is the dimensionless colloidal stability, Z is the dimensionless comprehensive performance, and a is the mass percentage of chemical stabilizer in the additives of the hydraulic braking system grease.

6. The method of selecting specific additives in a hydraulic brake system grease according to claim 4, wherein The relationship model II is: M = Z × b, where M is the dimensionless oxidation stability, Z is the dimensionless comprehensive performance, and b is the mass percentage of antioxidant in the additive of the hydraulic braking system grease.

7. The method of selecting the additives in the grease for hydraulic brake systems according to any one of claims 4-6, characterized in that, In step (5), the dimensionless comprehensive performance Z of the hydraulic braking system grease is described according to the relational model III of Z=(J+L+M)×1.01×(1+c), and the relational models I~III are decoupled to obtain the prediction model, which is: Z / J=[1.05×(1+c)×1.01] / [1-1.05×(1+c)×1.01×(a+b)]; In the aforementioned relational model III, Z represents dimensionless comprehensive performance, J represents dimensionless basic performance, L represents dimensionless colloidal stability, M represents dimensionless colloidal stability, and c represents the mass percentage of high-temperature stabilizer in the additives of the hydraulic braking system grease. In the prediction model, Z represents the dimensionless comprehensive performance, J represents the dimensionless basic performance, Z / J represents the comprehensive index of the grease, a represents the mass percentage of chemical stabilizers in the additives of the hydraulic braking system grease, b represents the mass percentage of antioxidants in the additives of the hydraulic braking system grease, and c represents the mass percentage of high-temperature stabilizers in the additives of the hydraulic braking system grease. Preferably, J is calculated according to the relational model IV, which is: J = 1000 × 1.13 × d + 2000 × e + 1000 × 1.13 × f + 400 × 1.065 × g; In the relationship model IV, d is the mass percentage of rust inhibitor in the additives of the hydraulic braking system grease, e is the mass percentage of corrosion inhibitor in the additives of the hydraulic braking system grease, f is the mass percentage of oiliness agent in the additives of the hydraulic braking system grease, and g is the mass percentage of thickener in the additives of the hydraulic braking system grease.

8. The method of selecting additives for a hydraulic brake system grease according to any one of claims 1 to 7, characterized in that, In step S3, components with a comprehensive index of 1.1 or higher and a relatively large comprehensive index are selected as the preferred formulation of the additive.

9. A method of selecting a hydraulic brake system grease formulation, said hydraulic brake system grease comprising an additive, said additive comprising said specific additive and said base additive, characterized in that, The formulation of the specific additive is obtained by the formulation method described in any one of claims 1-8.

10. A hydraulic brake system lubricating grease characterized by, The additives comprise the base additives and specific additives obtained by the formulation method according to any one of claims 1-8 or prepared by the formulation method according to claim 9. The mass percentages a of the chemical stabilizer, b of the antioxidant, and c of the high-temperature stabilizer in the additives of the hydraulic braking system grease must meet the following conditions: (1) 1.36%≤a≤26.50%, 1.14%≤b≤10.80%, 1.57%≤c≤28.00%; (2) [1.05×(1+c)×1.01] / [1-1.05×(1+c)×1.01×(a+b)]≥1.1.

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