Environment-friendly biodegradable lubricating oil for hydraulic retarder and preparation method of environment-friendly biodegradable lubricating oil

Abstract

The invention belongs to the technical field of lubricating oil, and particularly relates to environment-friendly biodegradable lubricating oil for a hydraulic retarder and a preparation method of the environment-friendly biodegradable lubricating oil. The environment-friendly biodegradable lubricating oil for the hydraulic retarder is prepared from the following components in parts by mass: 80 to 90 parts of base oil, 1 to 3 parts of a cleaning agent, 1 to 3 parts of a dispersing agent, 1 to 2 parts of a viscosity index improver, 0.5 to 2 parts of an anti-wear agent, 0.3 to 1.5 parts of an antioxidant, 0.1 to 0.5 part of an anti-foaming agent and 0.1 to 0.3 part of a pour point depressant, the antioxidant comprises hindered phenolic ester, aromatic amine and zinc thiophosphate in a mass ratio of (3-6): (2-5): 1. The environment-friendly biodegradable lubricating oil for the hydraulic retarder, provided by the invention, is biodegradable, and has excellent high-temperature resistance, oxidation resistance and low-temperature resistance and longer oil change period.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oils, and in particular relates to an environmentally friendly biodegradable lubricating oil for a hydraulic retarder and a preparation method thereof. Background Art

[0002] The transportation industry is increasingly demanding higher payloads, mileage, and average speeds, and engine power is constantly increasing. This limits the effectiveness of service brakes in certain operating conditions (such as mountainous, hilly, and plateau regions), impacting vehicle safety. The hydraulic retarder is a necessary auxiliary braking device. By driving the retarder's rotor, the fluid impacts the stator, converting the vehicle's kinetic energy into heat. This reduces the burden on the service brakes, ensuring safe driving and reducing fuel consumption.

[0003] Traditional automotive hydraulic retarders are mostly lubricated with engine oil or ordinary gear oil. However, engine oil or ordinary gear oil has poor shear resistance and its viscosity drops too quickly, resulting in a decrease in the efficiency of the hydraulic retarder.

[0004] In the prior art, Chinese patent publication number CN 114381318 A discloses a lubricating oil composition for a hydraulic retarder, comprising: (A) at least one high viscosity index hydrorefined Group III base oil, or a hydrorefined cyclopentane base oil, or any combination thereof; (B) at least one phosphorus-containing antiwear agent; (C) at least one ashless dispersant; (D) at least one antioxidant; (E) at least one metal deactivator; and (F) at least one antifoaming agent. Chinese patent publication number CN 117925300 A discloses a hydraulic retarder lubricant composition and its preparation method. The composition comprises the following components by weight: 0.01-6.5 parts detergent dispersant, 0.1-2.0 parts antioxidant, 0.1-2.5 parts phosphorus antiwear agent, 0.01-1.0 parts metal deactivator, 0.01-0.5 parts pour point depressant, 0.01-0.1 parts antifoaming agent, 0.1-20.0 parts viscosity index improver, and 60-85 parts base oil; the base oil comprises a hydrogenated base oil and an ester base oil in a weight ratio of 4-24:1. However, the low-temperature resistance, thermal oxidation stability, and anti-foaming properties of the above technical solution need to be improved. Summary of the Invention

[0005] The present invention aims to address one or more technical problems existing in the above-mentioned prior art and to provide at least a beneficial alternative. Specifically, the present invention provides an environmentally friendly, biodegradable lubricant for a hydraulic retarder and a method for preparing the same. The lubricant is biodegradable and exhibits excellent high-temperature and oxidation resistance, low-temperature resistance, and extended oil change intervals.

[0006] In one aspect, the present invention provides an environmentally friendly biodegradable lubricant for a hydraulic retarder, comprising the following components in parts by weight: 80-90 parts of base oil, 1-3 parts of detergent, 1-3 parts of dispersant, 1-2 parts of viscosity index improver, 0.5-2 parts of antiwear agent, 0.3-1.5 parts of antioxidant, 0.1-0.5 parts of antifoaming agent, 0.1-0.3 parts of pour point depressant; The antioxidant comprises hindered phenol ester, aromatic amine and zinc thiophosphate in a mass ratio of 3-6:2-5:1.

[0007] As an example, the mass fraction of the base oil may be any one of 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, and 90 parts, or a range consisting of any two parts.

[0008] In some preferred embodiments, the base oil includes diesters, saturated polyol esters and benzene polyesters.

[0009] In some preferred embodiments, the mass ratio of the diester, the saturated polyol ester and the benzene polyester is 2-4:3-6:1.

[0010] In a preferred embodiment, the mass ratio of the diester, the saturated polyol ester and the benzene polyester is 3:5:1.

[0011] In some preferred embodiments, the diester is selected from Priolube TM 1936 and PriEco ® At least one of 2006.

[0012] In some preferred embodiments, the saturated polyol ester is selected from Priolube TM 3970、Priolube TM 2720 ​​and Priolube TM At least one of 1937.

[0013] In some preferred embodiments, the benzene polyester is selected from PriEco ® 8005A、PriEco ® 8005 and PriEco ® At least one of 8004.

[0014] As an example, the mass fraction of the detergent may be any one of 1 part, 1.5 parts, 2 parts, 2.5 parts, and 3 parts, or a range consisting of any two parts.

[0015] In some preferred embodiments, the detergent is selected from at least one of calcium petroleum sulfonate, calcium alkyl salicylate, and calcium sulfide alkylphenate.

[0016] As an example, the mass fraction of the dispersant can be any value among 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, or a range value consisting of any two values.

[0017] In some preferred embodiments, the dispersant is selected from at least one of polyisobutylene succinimide, ashless phosphate and succinimide.

[0018] As an example, the mass fraction of the viscosity index improver can be any value among 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, or a range consisting of any two values.

[0019] In some preferred embodiments, the viscosity index improver is selected from at least one of polyisobutylene, methacrylate polymer and ethylene bisstearamide.

[0020] As an example, the mass fraction of the anti-wear agent can be any one of 0.5 parts, 0.8 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, or a range consisting of any two parts.

[0021] In some preferred embodiments, the anti-wear agent comprises oleyl alcohol polyoxyethylene ether phosphate and molybdenum dialkyldithiocarbamate in a mass ratio of 1-2:1-2.

[0022] As an example, the weight fraction of the antioxidant can be any one of 0.3 parts, 0.5 parts, 0.8 parts, 1 part, 1.2 parts, and 1.5 parts, or a range consisting of any two parts.

[0023] In a preferred embodiment, the hindered phenol ester is ETHANOX @ 4716.

[0024] In some preferred embodiments, the zinc thiophosphate salt is selected from at least one of dioctyl basic zinc thiophosphate salt, propyl octyl secondary alkyl zinc thiophosphate salt, primary secondary alkyl zinc thiophosphate salt and primary secondary octyl zinc thiophosphate salt.

[0025] In some preferred embodiments, the structural formula of the aromatic amine is as follows: .

[0026] As an example, the mass fraction of the anti-foaming agent can be any value among 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, or a range value consisting of any two values.

[0027] In some preferred embodiments, the anti-foaming agent is selected from at least one of methyl silicone oil, methyl silicone ester and polyacrylate.

[0028] As an example, the mass fraction of the pour point depressant can be any value among 0.1 part, 0.2 part, 0.3 part, or a range value consisting of any two values.

[0029] In some preferred embodiments, the pour point depressant is selected from at least one of polyalkyl methacrylate, ethylene-vinyl acetate copolymer and fumarate-vinyl acetate copolymer.

[0030] In some preferred embodiments, the mass ratio of the anti-wear agent, antioxidant and anti-foaming agent is 3-5:2-4:1.

[0031] On the other hand, the present invention provides a method for preparing the above-mentioned environmentally friendly biodegradable lubricant for the hydraulic retarder, comprising the following steps: first, mixing the base oil, detergent, dispersant, viscosity index improver, anti-wear agent, antioxidant, and pour point depressant evenly, and then adding the anti-foaming agent and mixing evenly to obtain the product.

[0032] In some preferred embodiments, the preparation method of the environmentally friendly biodegradable lubricant for the hydraulic retarder comprises the following steps: first heating the base oil to 60-65°C, adding a detergent, a dispersant, a viscosity index improver, an anti-wear agent, an antioxidant, and a pour point depressant, stirring evenly at 30-50 rpm for 20-30 minutes, and then adding an anti-foaming agent and stirring for 5-10 minutes.

[0033] Compared with the prior art, the present invention has the following beneficial effects: The existing lubricating oil for hydraulic retarders has the following technical problems: 1. It is not biodegradable, which does not meet the requirements of green development. In addition, to ensure the normal operation of the hydraulic retarder, the lubricating oil for the hydraulic retarder must have good viscosity and flow properties in high and low temperature environments. To address the above technical problems, the present invention optimizes biodegradable base oils and finds that the lubricant obtained by using a compound of diesters, saturated polyol esters, and benzene polyesters as the base oil has a high viscosity index, low temperature resistance, high temperature resistance, anti-foaming, and thermal oxidation stability.

[0034] 2. When the hydraulic retarder is in operation, the vehicle's kinetic energy is transferred to the lubricating oil through the rotor, which impacts the stator. This causes the lubricating oil temperature to rise rapidly, and the base oil is easily oxidized and deteriorated. Therefore, the lubricating oil needs to have good high-temperature oxidation resistance. To address this technical problem, the inventors have experimentally discovered that when hindered phenol esters, aromatic amines, and zinc thiophosphates are compounded in a mass ratio of 3-6:2-5:1, the resulting lubricating oil undergoes a 192h thermal oxidation stability test at 160°C. The change in kinematic viscosity at 40°C is less than 6%, the change in kinematic viscosity at 100°C is less than 5%, the acid value change is less than 0.3mgKOH / g, and the appearance remains clean and bright.

[0035] 3. Although the hydraulic retarder can be regarded as a wear-free auxiliary braking component, in order to improve the oil change period of commercial vehicles and construction machinery running under various harsh working conditions, the lubricant is required to have good wear resistance. At the same time, the rotor of the hydraulic retarder is in a rotating and stirring state during operation, so the lubricant needs to have good anti-foaming properties. In order to solve the above technical problems, the inventors have found through experimental research that when an anti-wear agent including oleyl alcohol polyoxyethylene ether phosphate and dialkyl dithiocarbamate molybdenum is used in a mass ratio of 1-2:1-2; and the mass ratio of the anti-wear agent, antioxidant and anti-foaming agent is controlled to be 3-5:2-4:1, the obtained environmentally friendly biodegradable lubricant for the hydraulic retarder has excellent anti-wear, anti-foaming and thermal oxidation stability.

[0036] 4. The environmentally friendly biodegradable lubricant for the hydraulic retarder provided by the present invention has been verified by automobile OEMs in slow-speed driving tests under various operating conditions, such as the 100,000-kilometer oil change period for heavy trucks in the Yunnan plateau area. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1. Appearance diagrams of the environmentally friendly biodegradable lubricating oil for hydraulic retarders according to Example 2 (left) and Example 3 (right) of the present invention after thermal oxidation stability testing; Figure 2 This is an appearance diagram of the environmentally friendly biodegradable lubricating oil for a hydraulic retarder according to Comparative Example 2 of the present invention after undergoing a thermal oxidation stability test; Figure 3 These are the performance test results of the environmentally friendly biodegradable lubricating oil for the hydraulic retarder according to Example 3 of the present invention. DETAILED DESCRIPTION

[0038] In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following examples are given for illustration. It should be noted that the following examples do not limit the scope of protection claimed by the present invention.

[0039] Unless otherwise specified, the raw materials, reagents or devices used in the following examples and comparative examples can be obtained from conventional commercial sources or by existing known methods.

[0040] Example 1 This embodiment provides an environmentally friendly biodegradable lubricating oil for a hydraulic retarder, which has the following composition in parts by mass: 85 parts of base oil, 2 parts of detergent, 2 parts of dispersant, 1.5 parts of viscosity index improver, 1.5 parts of antiwear agent, 1 part of antioxidant, 0.4 parts of antifoaming agent, and 0.2 parts of pour point depressant.

[0041] The base oil is diester, saturated polyol ester and benzene polyester in a mass ratio of 3:5:1.

[0042] The diester is Priolube TM 1936, originated from Dongguan Hongli Chemical Technology Co., Ltd.

[0043] The saturated polyol ester is Priolube TM 3970, from Dongguan Hongli Chemical Technology Co., Ltd.

[0044] The benzene polyester is PriEco ® 8005A, from Shanghai Daopu Chemical Co., Ltd.

[0045] The cleaning agent is calcium sulfide alkylphenol, which comes from Nanjing Hand in Hand Chemical Technology Co., Ltd., model: T123.

[0046] The dispersant is polyisobutylene succinimide, which is sourced from Nanjing Hand in Hand Chemical Technology Co., Ltd., model: T154.

[0047] The viscosity index improver is a methacrylate polymer, brand: Irgaflo ® 1100V, from Dongguan Hongli Chemical Technology Co., Ltd.

[0048] The anti-wear agent is oleyl alcohol polyoxyethylene ether phosphate and dialkyl dithiocarbamate molybdenum in a mass ratio of 1:1.

[0049] The oleyl alcohol polyoxyethylene ether phosphate, brand: Solvay LUBRHOPHOS ® LB-400 comes from Dongguan Hongli Chemical Technology Co., Ltd.

[0050] The molybdenum dialkyldithiocarbamate is sourced from Jinzhou Chenghua New Materials Co., Ltd., model: MO-10.

[0051] The antioxidant is hindered phenol ester, aromatic amine and zinc thiophosphate in a mass ratio of 5:3:1.

[0052] The hindered phenol ester is ETHANOX ® 4716, from Guangzhou Qisheng Trading Co., Ltd.

[0053] The zinc thiophosphate is dioctyl alkaline zinc thiophosphate, which is sourced from Shenyang Hualun Lubricant Additive Co., Ltd., model: T203.

[0054] The structural formula of the aromatic amine is as follows: , from Tianjin Li'anlong New Materials Co., Ltd., model: RIANOX ® 5057.

[0055] The anti-foaming agent is methyl silicone oil, which is sourced from Jinzhou Shengda Chemical Co., Ltd., model: T-901.

[0056] The pour point depressant is a fumarate-vinyl acetate copolymer, which is sourced from Jinzhou Shengda Chemical Co., Ltd., model: T-816A.

[0057] The preparation method of the environmentally friendly biodegradable lubricant for the hydraulic retarder is as follows: first, the base oil is heated to 60°C, a detergent, a dispersant, a viscosity index improver, an anti-wear agent, an antioxidant, and a pour point depressant are added, and the mixture is stirred evenly at 50 rpm for 20 minutes, and then an anti-foaming agent is added and stirred for 10 minutes.

[0058] Example 2 This embodiment provides an environmentally friendly biodegradable lubricant for a hydraulic retarder. The difference from Example 1 is that the composition, by mass, is as follows: 80 parts of base oil, 1 part of detergent, 1 part of dispersant, 1 part of viscosity index improver, 0.5 part of antiwear agent, 0.5 part of antioxidant, 0.2 part of antifoaming agent, and 0.1 part of pour point depressant; the rest are the same.

[0059] Example 3 This embodiment provides an environmentally friendly biodegradable lubricant for a hydraulic retarder. The difference from Example 1 is that the composition, by mass, is as follows: 90 parts of base oil, 3 parts of detergent, 3 parts of dispersant, 2 parts of viscosity index improver, 2 parts of antiwear agent, 1.5 parts of antioxidant, 0.5 parts of antifoaming agent, and 0.3 parts of pour point depressant; the rest are the same.

[0060] Example 4 This embodiment provides an environmentally friendly biodegradable lubricant for a hydraulic retarder. The difference from Example 1 is that the base oil is a diester and a saturated polyol ester in a mass ratio of 3:6; all other aspects are the same.

[0061] Example 5 This embodiment provides an environmentally friendly biodegradable lubricant for a hydraulic retarder, which is different from Example 3 only in that the anti-wear agent is oleyl alcohol polyoxyethylene ether phosphate; all other aspects are the same.

[0062] Example 6 This embodiment provides an environmentally friendly biodegradable lubricant for a hydraulic retarder. The only difference from Example 3 is that oleyl alcohol polyoxyethylene ether phosphate is replaced by isooctyl phosphite of equal quality, which is sourced from Wuhan Xindadi Environmental Protection Materials Co., Ltd., model: DURAPHOS B(2EH)HP.

[0063] Comparative Example 1 This comparative example provides an environmentally friendly biodegradable lubricant for a hydraulic retarder, which is different from Example 3 only in that the antioxidant is a hindered phenol ester and zinc thiophosphate in a mass ratio of 5:4; all other aspects are the same.

[0064] Comparative Example 2 This comparative example provides an environmentally friendly biodegradable lubricant for a hydraulic retarder, which is different from Example 3 only in that the antioxidant is an aromatic amine and zinc thiophosphate in a mass ratio of 8:1; all other aspects are the same.

[0065] Comparative Example 3 This comparative example provides an environmentally friendly biodegradable lubricant for a hydraulic retarder, which is different from Example 3 only in that the hindered phenol ester ETHANOX ® 4716 is replaced by phenolic ester IRGANOX of equal quality ® L135; the rest are the same.

[0066] Comparative Example 4 This comparative example provides an environmentally friendly biodegradable lubricant for a hydraulic retarder. The only difference from Example 3 is that the aromatic amine is nonyl-N-(nonylphenyl) aniline, which is from Tianjin Li'anlong New Materials Co., Ltd., model: RIANOX ® 5067; the rest are the same.

[0067] Performance Test 1: The hydraulic retarder prepared in Example 1 to Example 6 was subjected to performance testing using an environmentally friendly biodegradable lubricant. The specific test methods and test results are shown in Tables 1 and Figure 1 .

[0068] Table 1 As can be seen from Table 1, the environmentally friendly biodegradable lubricating oils for hydraulic retarders of Examples 1 and 3 have excellent viscosity index, low temperature resistance, anti-foaming property, load-bearing capacity and thermal oxidation stability; the effect of the environmentally friendly biodegradable lubricating oil for hydraulic retarders of Example 2 is worse than that of Examples 1 and 3; in Example 4, due to the absence of benzene polyesters, the environmentally friendly biodegradable lubricating oil for hydraulic retarders has excellent viscosity index, low temperature resistance, high temperature foaming property, load-bearing capacity and thermal oxidation stability, but is significantly deteriorated; in Example 5, due to the absence of molybdenum dialkyldithiocarbamate, the high temperature foaming property, load-bearing capacity and thermal oxidation stability of the environmentally friendly biodegradable lubricating oil for hydraulic retarders are significantly deteriorated; in Example 6, due to the replacement of oleyl alcohol polyoxyethylene ether phosphate with isooctyl phosphite of equal quality, the anti-foaming property, high temperature foaming property, load-bearing capacity and thermal oxidation stability of the environmentally friendly biodegradable lubricating oil for hydraulic retarders are significantly deteriorated.

[0069] Depend on Figure 1It can be seen that the environmentally friendly biodegradable lubricating oil for the hydraulic retarder of Example 2 had impurities after the thermal oxidation stability test and had a poor effect; while the environmentally friendly biodegradable lubricating oil for the hydraulic retarder of Example 3 was still clean and bright after the thermal oxidation stability test.

[0070] Performance Test 2: The hydraulic retarder prepared in Comparative Examples 1 to 4 was subjected to performance tests using an environmentally friendly biodegradable lubricant. The specific test methods and test results are shown in Tables 2 and 3. Figure 2 .

[0071] Table 2 As can be seen from Table 2, Comparative Example 1 does not contain aromatic amines, Comparative Example 2 does not contain hindered phenol esters, and Comparative Example 3 contains hindered phenol ester ETHANOX. ® 4716 replaced by phenolic ester IRGANOX ® L135; Comparative Example 4 Due to the aromatic amine RIANOX ® 5057 replaced by RIANOX ® 5067, the thermal oxidation stability of the obtained environmentally friendly biodegradable lubricant for hydraulic retarder is significantly deteriorated.

[0072] Depend on Figure 2 It can be seen that the environmentally friendly biodegradable lubricating oil for the hydraulic retarder of Comparative Example 2 is obviously oxidized, dark in color, and opaque after the thermal oxidation stability test.

[0073] Performance Test 3: The performance of the hydraulic retarder prepared in Example 3 was tested using an environmentally friendly biodegradable lubricant. The specific test method and test results are as follows: Figure 2 shown.

[0074] Depend on Figure 2 It can be seen that the environmentally friendly biodegradable lubricating oil for the hydraulic retarder of Example 3 of the present invention also has a relatively high flash point and is free of smoke and carbon deposits.

[0075] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. An environmentally friendly biodegradable lubricant for a hydraulic retarder, characterized in that: The composition comprises the following components in parts by weight: 80-90 parts of base oil, 1-3 parts of detergent, 1-3 parts of dispersant, 1-2 parts of viscosity index improver, 0.5-2 parts of antiwear agent, 0.3-1.5 parts of antioxidant, 0.1-0.5 parts of antifoaming agent, 0.1-0.3 parts of pour point depressant; The antioxidant comprises hindered phenol ester, aromatic amine and zinc thiophosphate in a mass ratio of 3-6:2-5:

1.

2. The environmentally friendly biodegradable lubricating oil for a hydraulic retarder according to claim 1, characterized in that: The base oils include diesters, saturated polyol esters and benzene polyesters.

3. The environmentally friendly biodegradable lubricating oil for the hydraulic retarder according to claim 2, characterized in that: The diester is selected from Priolube TM 1936 and PriEco ® 2006 at least one; the saturated polyol ester is selected from Priolube TM 3970、Priolube TM 2720 ​​and Priolube TM 1937; the benzene polyester is selected from PriEco ® 8005A、PriEco ® 8005 and PriEco ® At least one of 8004.

4. The environmentally friendly biodegradable lubricant for a hydraulic retarder according to claim 1, characterized in that: The detergent is selected from at least one of petroleum calcium sulfonate, calcium alkyl salicylate and alkyl phenol calcium sulfide; the dispersant is selected from at least one of polyisobutylene succinimide, ashless phosphate and succinimide; and the viscosity index improver is selected from at least one of polyisobutylene, methacrylate polymer and ethylene bisstearamide.

5. The environmentally friendly biodegradable lubricant for the hydraulic retarder according to claim 1, characterized in that: The anti-wear agent comprises oleyl alcohol polyoxyethylene ether phosphate and dialkyl dithiocarbamate molybdenum in a mass ratio of 1-2:1-2.

6. The environmentally friendly biodegradable lubricant for a hydraulic retarder according to claim 1, characterized in that: The hindered phenol ester is ETHANOX @ 4716.

7. The environmentally friendly biodegradable lubricant for a hydraulic retarder according to claim 1, characterized in that: The zinc thiophosphate salt is selected from at least one of dioctyl basic zinc thiophosphate salt, propyloctyl secondary and primary alkyl zinc thiophosphate salt, primary and secondary alkyl zinc thiophosphate salt and primary and secondary octyl zinc thiophosphate salt.

8. The environmentally friendly biodegradable lubricant for a hydraulic retarder according to claim 1, characterized in that: The structural formula of the aromatic amine is as follows: 。 9. The environmentally friendly biodegradable lubricant for a hydraulic retarder according to any one of claims 1 to 8, characterized in that: The mass ratio of the anti-wear agent, antioxidant and anti-foaming agent is 3-5:2-4:

1.

10. The method for preparing the environmentally friendly biodegradable lubricating oil for a hydraulic retarder according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: firstly, mixing base oil, detergent, dispersant, viscosity index improver, anti-wear agent, antioxidant and pour point depressant evenly, and then adding anti-foaming agent and mixing evenly to obtain the product.

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