Lubricant for gear-bearing-bearing bush linkage structure and preparation method

Abstract

The invention relates to a lubricant for a gear-bearing-bearing bush linkage structure, which comprises the following components in percentage by weight: 30-60% of synthetic base oil, 5-8% of anionic surfactant, 2-8% of metal deactivator and the balance of additive, the anionic surfactant is obtained by performing high-pressure treatment on an active nano metal oxide, ammonium phosphate, mahogany petroleum sulfonate and a thiophosphorus compound; the metal deactivator is a compound of thiatriimidazole and alkyl imidazolium salt. The special anionic surfactant and the metal deactivator are introduced into the synthetic base oil, and an anionic polar group in the anionic surfactant is activated by static electricity generated by friction, so that the anionic polar group is promoted to form an ionic bond with metal surface cations, and a high-strength ionic bond boundary oil film is constructed; meanwhile, on one hand, the metal deactivator can form a chelating coordination bond with metal cations to block an oxidation catalytic chain reaction, and on the other hand, the metal deactivator can be in electrostatic attraction with anionic polar groups to further improve the compactness of an oil film.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating oil, in particular to a lubricant for gear-bearing-bush linkage structure and a preparation method thereof. BACKGROUND

[0002] At present, linkage mechanisms (such as gear-bearing-bush) in domestic tire production equipment, calendering machinery, engineering plastic molding equipment and other large equipment generally face complex working conditions such as high temperature, high load and high speed, so the performance requirements of lubricating oil are also correspondingly improved.

[0003] The current mainstream lubricant usually uses sulfur-containing extreme pressure anti-wear agents (such as sulfurized olefins), and the oil film formed thereby can provide certain protection, but has the following problems:

[0004] (1) At high temperatures, sulfur-containing extreme pressure anti-wear agents are prone to thermal oxidative degradation, and the lubricating efficiency is low;

[0005] (2) At high load and high speed, the oil film formed by the sulfur-containing extreme pressure anti-wear agent is prone to thermal decomposition due to friction, and the anti-wear performance decays quickly.

[0006] Therefore, the traditional lubricant has poor lubricating effect and short service life and needs to be frequently replaced, which cannot meet the needs of continuous production.

[0007] Therefore, the present application is proposed. SUMMARY

[0008] In order to solve the above technical problems, the present application provides a lubricant for gear-bearing-bush linkage structure and a preparation method thereof.

[0009] The technical scheme adopted by the present application is:

[0010] The present application provides a lubricant for gear-bearing-bush linkage structure, by 100% weight, comprising:

[0011] 30-60% of synthetic base oil, 5-8% of anionic surfactant, 2-8% of metal deactivator, and the balance of additives;

[0012] The anionic surfactant is obtained by high-pressure treatment of active nano-metal oxide, ammonium phosphate salt, petroleum sulfonate and thio-phosphorus compound;

[0013] The metal deactivator is a complex of thiazolimidazole and alkyl imidazole salt.

[0014] The application provides a lubricant for a gear-bearing-bush linkage structure, which comprises special anionic surfactants and metal deactivators in synthetic base oil, and the two can form a dense chemical adsorption oil film on the metal surface. Specifically, the anionic polar groups (such as sulfonate) in the anionic surfactants are activated by static electricity generated by the linkage mechanism during high-speed and high-load operation, so that the anionic polar groups form ionic bonds with metal cations on the surface, and a high-strength ionic bond boundary oil film is constructed. Meanwhile, imidazole metal deactivators are introduced, on the one hand, the thiotriazole in the metal deactivators can form chelate coordination bonds with metal cations through nitrogen atoms, so as to block the oxidation catalytic chain reaction, on the other hand, the alkyl imidazole salt in the metal deactivators can be electrostatically attracted to the excess anionic polar groups through imidazole cations, so as to fill the gaps in the film layer and further improve the density of the oil film. Through the triple mechanism of ionic bond + coordination bond + electrostatic attraction, the extreme pressure and wear resistance of the lubricant can be significantly improved, so as to solve the lubrication problem under complex conditions such as high temperature and high load.

[0015] Preferably, the content of the active nano-metal oxide is 0.2-0.8wt%, the content of the ammonium phosphate salt is 15-25wt%, the content of the petroleum sulfonate is 25-35wt%, and the content of the thiophosphorus compound is 40-50wt%.

[0016] Preferably, the high-pressure treatment is carried out at a temperature of 80-82 DEG C, a pressure of 1-1.5 MPa and for 1.5-2.5 h.

[0017] Preferably, the synthetic base oil is poly-alpha-olefin base oil and / or ester base oil.

[0018] Preferably, the additive comprises 25-40% of tackifier, 2-6% of anti-rust and anti-corrosion agent, 6-10% of general gear oil composite agent, 1-3% of pour point depressant and 0.005-0.015% of anti-foaming agent.

[0019] Preferably, the tackifier is sulfurized polyisobutylene, and the viscosity at 100 DEG C is 200-500 cSt.

[0020] The anti-rust and anti-corrosion agent is benzene triazole fatty acid ammonium salt.

[0021] The general gear oil composite agent is SK6108.

[0022] The pour point depressant is polymethyl acrylate.

[0023] The anti-foaming agent is dimethyl silicone oil.

[0024] The application also provides a preparation method of the lubricant for the gear-bearing-bush linkage structure.

[0025] S1. Take synthetic base oil, heat it to 60-65℃ and stir evenly;

[0026] S2. Add part of the additives and stir for 20-25 minutes, then add the anionic surfactant, metal deactivator, and the remaining additives, and stir for 40-45 minutes to obtain the product. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0028] In one aspect, the present invention provides a lubricant for a gear-bearing-bearing bush linkage structure, comprising, by weight, 100%:

[0029] Synthetic base oil 30-60%, anionic surfactant 5-8%, metal deactivator 2-8%, the balance is additives;

[0030] The anionic surfactant is obtained by high-pressure treatment of active nano-metal oxides, ammonium phosphate, petroleum sulfonate and thiophosphorus compounds;

[0031] The metal deactivator is a compound of thiatriimazole and alkyl imidazole salt.

[0032] In the present invention, under tribostatic conditions, the anionic polar groups of anionic surfactants are directionally adsorbed onto the metal surface. The sulfonate radicals provided by the petroleum sulfonate are chemically adsorbed onto the metal surface via ionic bonds, forming a stable chemical adsorption oil film matrix. Active nano-metal oxides catalyze the decomposition of thiophosphorus compounds to release active sulfur and phosphorus elements, enhancing the extreme pressure and anti-wear properties of the chemical adsorption oil film. Ammonium phosphates react with metal ions via phosphate radicals to deposit and fill micro-defects on the surface of the chemical adsorption oil film. The multiple components synergistically construct a high-strength chemical adsorption oil film. For example, the active nano-metal oxide can be nano-zinc oxide, the ammonium phosphate can be any of ammonium phosphate and diammonium hydrogen phosphate, the petroleum sulfonate can be sodium petroleum sulfonate and / or barium petroleum sulfonate, and the thiophosphorus compound can be any of thiophosphate esters and thiophosphate salts.

[0033] In a preferred embodiment of the present invention, the content of active nano-metal oxide is 0.2-0.8 wt %, the content of ammonium phosphate is 15-25 wt %, the content of petroleum sulfonate is 25-35 wt %, and the content of thiophosphorus compound is 40-50 wt %.

[0034] In one preferred embodiment of the present application, the high-pressure treatment is carried out at a temperature of 80-82 DEG C, a pressure of 1-1.5 MPa, and a time of 1.5-2.5 h. In the present application, the high-pressure treatment can improve the activity of the anionic surfactant, and is conducive to the formation of a stable chemical adsorption film in the application of the lubricating oil. The normal-pressure treatment has a negative effect on the strength of the chemical adsorption film.

[0035] In one preferred embodiment of the present application, the synthetic base oil is a poly-alpha-olefin base oil and / or an ester base oil. In the present application, the synthetic base oil can be selected from a poly-alpha-olefin base oil or an ester base oil. The poly-alpha-olefin base oil has the characteristics of high viscosity, high flash point, and low pour point, and can ensure the high-temperature stability and low-temperature fluidity of the base oil, and the oil film performance is better.

[0036] In one preferred embodiment of the present application, the additives include: tackifier 25-40%, anti-rust and anti-corrosion agent 2-6%, general gear oil complex agent 6-10%, pour point depressant 1-3%, and anti-foaming agent 0.005-0.015%.

[0037] In one preferred embodiment of the present application, the tackifier is vulcanized polyisobutylene, and the viscosity at 100 DEG C is 200-500 cSt.

[0038] The anti-rust and anti-corrosion agent is benzotriazole fatty acid ammonium salt.

[0039] The general gear oil complex agent is SK6108.

[0040] The pour point depressant is polymethyl acrylate.

[0041] The anti-foaming agent is dimethyl silicone oil.

[0042] In the present application, the vulcanized polyisobutylene with high viscosity can enhance the thickness and durability of the oil film; the benzotriazole fatty acid ammonium salt can form a high-density molecular film on the metal surface to isolate water; the rare earth nanoparticles contained in the general gear oil complex agent SK6108 can reduce the friction coefficient; the addition of the polymethyl acrylate pour point depressant can reduce the pour point of the lubricating oil and improve the low-temperature fluidity; and the dimethyl silicone oil can reduce the surface tension of the bubbles and avoid the rupture of the oil film caused by the foam under the high-speed shearing of the linkage structure. The lubricating oil of the present application can meet the requirements of various extreme working conditions on the lubricating performance by the selection and compounding of the base oil, additives, and other raw materials.

[0043] The present application also provides a preparation method of the lubricant for the gear-bearing-bearing linkage structure according to any one of the technical solutions above, which comprises the following steps:

[0044] S1, taking synthetic base oil, heating to 60-65 DEG C, and stirring uniformly;

[0045] S2, add part of the additive and stir for 20-25 min, then add anionic surfactant, metal deactivator, the rest of the additives, and stir for 40-45 min.

[0046] Example 1

[0047] A lubricant for gear-bearing-bush linkage structure, by 100% by weight, comprising:

[0048] Synthetic base oil (polyalphaolefin PAO6) 49.99%, anionic surfactant 5%, metal deactivator (thiatriazole and 1-ethyl-3-alkyl imidazole chloride compound at a weight ratio of 1:1) 3%, tackifier (sulfurized polyisobutylene PE2400) 29%, rust and corrosion inhibitor (benzotriazole fatty acid ammonium salt) 3%, general gear oil complex agent SK6108 8%, pour point depressant (polymethacrylate) 2%, antifoaming agent (dimethyl silicone oil) 0.01%;

[0049] The anionic surfactant is prepared as follows: by 100% by weight, 0.5% nano zinc oxide, 20% ammonium phosphate, 20% sodium petroleum sulfonate, 10% barium petroleum sulfonate, 49.5% triphenyl phosphate are mixed, and high pressure treatment is carried out under the conditions of temperature 80℃, pressure 1.5MPa, and time 2h.

[0050] It is prepared by the following method, comprising the following steps:

[0051] S1, take synthetic base oil, heat to 60℃, and stir uniformly;

[0052] S2, add general gear oil complex agent and tackifier and stir for 20 min, then add anionic surfactant, metal deactivator, rust and corrosion inhibitor, pour point depressant and antifoaming agent, and stir for 40 min.

[0053] Example 2

[0054] The difference between this embodiment and example 1 is that the components and the amount are different. The preparation method remains unchanged.

[0055] A lubricant for gear-bearing-bush linkage structure, by 100% by weight, comprising:

[0056] Synthetic base oil (trimethylolpropane ester) 39.99%, anionic surfactant (same preparation as example 1) 6%, metal deactivator (thiatriazole and 1-ethyl-3-alkyl imidazole chloride compound in a weight ratio of 1:1) 3%, tackifier (sulfurized polyisobutylene PE2400) 35%, rust and corrosion inhibitor (benzotriazole fatty acid ammonium salt) 4%, general gear oil complexing agent SK6108 10%, pour point depressant (polymethacrylate) 2%, antifoaming agent (dimethyl silicone oil) 0.01%.

[0057] Comparative example 1

[0058] The difference between this comparative example and example 1 is that sulfurized olefin is used to replace anionic surfactant in equal amount. The rest of the steps remain unchanged.

[0059] Comparative example 2

[0060] The difference between this comparative example and example 1 is that petroleum sulfonate sodium is used to replace anionic surfactant in equal amount. The rest of the steps remain unchanged.

[0061] Examples 1-2 and comparative examples 1-2 are subjected to performance testing, and the test results are recorded in Table 1.

[0062] Table 1

[0063]

[0064] As can be seen from Table 1, the lubricating oil prepared in examples 1-2 of the present application can meet the lubrication requirements under high torsion, high temperature and high speed conditions. In particular, example 1 uses poly-alpha olefin as base oil, which has higher adaptability to other components and better performance. Compared with comparative examples 1-2, comparative examples 1-2 use traditional additives, the film forming mechanism is different from that of the present application, the ionic bond oil film loses the activation of static electricity, and the oil film is easy to break under complex working conditions, so the extreme pressure and wear resistance is obviously decreased.

[0065] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lubricant for a gear-bearing-bearing bush linkage structure, characterized in that: By 100% weight, including: Synthetic base oil 30-60%, anionic surfactant 5-8%, metal deactivator 2-8%, the balance is additives; The anionic surfactant is obtained by high-pressure treatment of active nano-metal oxides, ammonium phosphate, petroleum sulfonate and thiophosphorus compounds; The metal deactivator is a compound of thiatriimazole and alkyl imidazole salt.

2. The lubricant for the gear-bearing-bearing bush linkage structure according to claim 1, characterized in that: The content of the active nano-metal oxide is 0.2-0.8 wt %, the content of the ammonium phosphate is 15-25 wt %, the content of the petroleum sulfonate is 25-35 wt %, and the content of the thiophosphorus compound is 40-50 wt %.

3. The lubricant for the gear-bearing-bearing bush linkage structure according to claim 1, characterized in that: The conditions of the high pressure treatment are: temperature of 80-82° C., pressure of 1-1.5 MPa, and time of 1.5-2.5 h.

4. The lubricant for the gear-bearing-bearing bush linkage structure according to claim 1, characterized in that: The synthetic base oil is a polyalphaolefin base oil and / or an ester base oil.

5. The lubricant for the gear-bearing-bearing bush linkage structure according to claim 1, characterized in that: The additives include: 25-40% of a tackifier, 2-6% of an anti-rust and anti-corrosion agent, 6-10% of a universal gear oil compound, 1-3% of a pour point depressant, and 0.005-0.015% of an anti-foaming agent.

6. The lubricant for the gear-bearing-bearing bush linkage structure according to claim 5, characterized in that: The tackifier is sulfided polyisobutylene, and the viscosity at 100°C is 200-500 cSt; The anti-rust and anti-corrosion agent is benzotriazole fatty acid ammonium salt; The universal gear oil compound is SK6108; The pour point depressant is polymethacrylate; The anti-foaming agent is dimethyl silicone oil.

7. A method for preparing a lubricant for a gear-bearing-bearing bush linkage structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Take synthetic base oil, heat it to 60-65℃ and stir evenly; S2. Add part of the additives and stir for 20-25 minutes, then add the anionic surfactant, metal deactivator, and the remaining additives, and stir for 40-45 minutes to obtain the product.

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