CN112779073B - Prefabricated thickening agent containing nano zinc oxide and lubricating grease composition obtained by prefabricated thickening agent - Google Patents

Prefabricated thickening agent containing nano zinc oxide and lubricating grease composition obtained by prefabricated thickening agent Download PDF

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CN112779073B
CN112779073B CN202110007890.9A CN202110007890A CN112779073B CN 112779073 B CN112779073 B CN 112779073B CN 202110007890 A CN202110007890 A CN 202110007890A CN 112779073 B CN112779073 B CN 112779073B
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zinc oxide
thickening agent
nano zinc
prefabricated
grease composition
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CN112779073A (en
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王晓波
华振涛
来冰冰
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Qingdao Center Of Resource Chemistry & New Materials (qingdao Research Development Center Lanzhou Institute Of Chemical Physics Chinese Academy Of Sciences)
Lanzhou Institute of Chemical Physics LICP of CAS
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Qingdao Center Of Resource Chemistry & New Materials (qingdao Research Development Center Lanzhou Institute Of Chemical Physics Chinese Academy Of Sciences)
Lanzhou Institute of Chemical Physics LICP of CAS
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M123/00—Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential
    • C10M123/02—Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential at least one of them being a non-macromolecular compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/02—Mixtures of base-materials and thickeners
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
    • C10M2201/0626—Oxides; Hydroxides; Carbonates or bicarbonates used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
    • C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids used as base material

Abstract

The invention relates to an in-situ preparation technology of an efficient antifriction and antiwear nano material additive and a lubricating grease composition obtained by the same. The lubricating grease composition consists of 12-lithium hydroxystearate, base oil and a nano additive; the in-situ preparation method of the high-efficiency antifriction and antiwear nano additive comprises the following steps: under a proper solvent environment, a prefabricated thickening agent system containing small-size nano zinc oxide and 12-hydroxy lithium stearate is directly obtained by a one-step method through double decomposition reaction between 12-hydroxy zinc stearate and lithium hydroxide monohydrate. The in-situ preparation technology of the high-efficiency antifriction antiwear agent provided by the invention has the beneficial effects of high efficiency, good controllability, good dispersibility, organic combination with the preparation process of lubricating grease and the like, and the obtained lubricating grease composition has excellent tribological performance, good low-temperature viscosity and longer service life.

Description

Prefabricated thickening agent containing nano zinc oxide and lubricating grease composition obtained by prefabricated thickening agent
Technical Field
The invention relates to the technical field of lubricating grease, in particular to a prefabricated thickening agent containing nano zinc oxide and a lubricating grease composition obtained by the prefabricated thickening agent.
Background
The special physical and chemical properties of nanoparticles have attracted great interest in the field of tribology, in particular in the field of lubricating grease additives. With the rise and development of nanotechnology and nano-tribology, the research of nano particles in the field of lubrication has also achieved great success, and the nano particles as additives not only greatly improve the tribology performance of the lubricating grease, but also provide a brand new method for the in-situ self-repair of surface damage of friction pairs. In addition, some nanoparticles exhibit good environmental friendliness, and these advantages accelerate the research of nanoparticles as grease additives. The lubricating performance of nanoparticles has been confirmed by many friction tests, and the lubricating mechanism of nanoparticles is also studied make internal disorder or usurp, but the specific action mechanism is still in a presumed stage. The analysis of the action mechanism mainly has the following theories at present: (1) permeation and tribochemical reaction membrane mechanisms; (2) the mechanism of action of the deposited film; (3) the "rolling ball" mechanism of action; (4) an ultra-smooth surface mechanism of action; (5) the mechanism of complex action. The nano-additive is mainly classified into (1) layered inorganic substances, such as graphite and WS2、MoS2Etc.; (2) nano metals such as copper, nickel, aluminum, zinc and other simple substances or composite metal powder; (3) nano rare earth compounds such as fluoride, rare earth hydroxide, rare earth borate, etc.; (4) nano-micron inorganic borate, such as copper borate, titanium, nickel, magnesium, zinc, aluminum, ferrous, etc.; (5) nano oxides such as aluminum oxide, tin oxide, titanium oxide, silicon oxide, zinc oxide, zirconium oxide, and the like; (6) polymers, containing S, N hybrid copolymer nanoparticles and polystyrene nanoparticles; (7) hard powders such as nanodiamond and C60 hard powders. In recent years, more and more attention has been paid to environmentally friendly additives. The environmental friendliness is mainly reflected in that the nanoparticles serving as the lubricating oil additive can replace active extreme pressure additives containing S, Cl and P so as to solve the environmental pollution caused by the S, Cl and P in tail gas. According to the lubricating mechanism of the nano particles, a layer of protective film can be formed on the friction surface by some nano particles, and the protective film not only plays a role in wear resistance and friction reduction, but also isolates chemical corrosion atmosphere caused by oil combustion and harmful impurities or acid steam in oil, and plays a role in protecting parts.
Oxides represented by nano zinc oxide have been proved to have good antifriction and antiwear properties as grease additives. However, in the research of nano ZnO as a grease additive, the problems of dispersibility and stability of nano ZnO in grease are very important. The surface modification of nano ZnO can effectively solve the dispersion stability, but the effect of nano particles and modifiers in tribology experiments is unknown. In addition, the lubricating grease generally acts under high temperature, high pressure and high load, nano ZnO is easy to agglomerate in such an environment, and the agglomerate can not only play a role in friction reduction and wear resistance, but also possibly increase friction. In addition, studies have shown that the particle size of nano ZnO has a significant impact on tribological properties. For example, nano ZnO particles having a smaller particle size have better anti-wear effects in grease than particles having a slightly larger particle size, but when good extreme pressure properties are required for grease, it is preferable to add nano particles having a larger particle size. Therefore, the size of the nanoparticles has a significant effect on the grease performance.
The addition of nano zinc oxide into lubricating grease generally adopts an external method, namely, nano particles are added into the obtained lubricating grease by a dispersing means. Then the nano additive is dispersed in the system by physical method, chemical method and other means. The dispersion of nanoparticles is the process of separating the aggregates of nanoparticles into individual nanoparticles or small aggregates of few nanoparticles, which are uniformly distributed in a medium. It is difficult to separate and wet each particle surface rapidly by the dispersion medium during the dispersion process, so it is not easy to achieve a good dispersion effect. In this regard, many studies have been conducted by the relevant scholars in the art.
CN105733753B discloses a lubricating grease composition for a high-speed railway traction motor bearing, which takes alkyl naphthalene and PAO as base oil and contains 0-6% of non-surface-modified nano zinc oxide additive. The lubricating grease composition has the advantages of excellent extreme pressure wear resistance, excellent oxidation resistance, outstanding shear stability, rust resistance, wider high and low temperature performance and the like through a special process of high-speed shearing in a cooling stage.
CN 1922294a discloses a grease composition for constant velocity joints containing base oil, a thickener, an organic molybdenum compound and a nano zinc oxide additive. The composition can effectively reduce the abrasion of the universal joint and effectively prevent the lubricating part from being scaled and peeled.
CN 104194873A discloses an electric shovel gear grease composition, wherein the base oil is mineral oil and synthetic oil, the thickening agent is composed of 12-hydroxystearic acid, adipic acid, salicylic acid and hydrogen hydroxide, and the additive comprises molybdenum disulfide, nano zinc oxide and other components. The lubricating grease composition is widely applied to the mining machinery industry, reduces abrasion, and can prolong the grease replacement period.
The existing technology and means mostly add the nano zinc oxide into the system by an external addition method, and have the defects of difficult control of dispersion degree, low efficiency and the like. Therefore, it is highly desirable to develop a suitable method that can not only realize the efficient conversion of nano zinc oxide, but also be organically combined with the preparation process of the grease. Currently, no studies in this area have been reported.
Disclosure of Invention
The invention aims to provide a prefabricated thickening agent containing an efficient antifriction and antiwear nano zinc oxide additive and a lubricating grease composition obtained by the prefabricated thickening agent.
The invention relates to a prefabricated thickening agent containing efficient antifriction and antiwear nano zinc oxide additive, which is prepared from 12-zinc hydroxystearate and LiOH2The O solution is prepared by reaction, and the reaction process is simple as follows:
Figure BDA0002883798440000031
the invention relates to a preparation method of a prefabricated thickening agent containing a high-efficiency antifriction and antiwear nano zinc oxide additive, which comprises the following steps: at 60-9Adding zinc 12-hydroxystearate to the solvent at 0 deg.C, and adding 1-5 wt.% of LiOH. H within 30 min2And reacting the O solution for 2 to 4 hours, filtering and drying to obtain solid powder.
As a preferred embodiment, the zinc 12-hydroxystearate is reacted with lioh2The molar ratio of O is 1: 1.5-1: 2.2. Exceeding this range reduces the reaction efficiency and ultimately affects the thermal and colloidal stability of the grease composition, failing to achieve the desired structure and consistency of the product.
As a preferred embodiment, the solvent is one or a mixture of two of ethanol and water, lioh2O solution is LiOH2And O and one or two of ethanol and water.
The invention also provides a lubricating grease composition containing the efficient antifriction and antiwear nano zinc oxide prefabricated thickening agent, which comprises base oil and the efficient antifriction and antiwear nano zinc oxide additive prefabricated thickening agent.
The lubricating grease composition containing the high-efficiency antifriction and wear-resistant nano zinc oxide prefabricated thickening agent is obtained by the following method: adding prefabricated soap containing nano zinc oxide as a thickening agent into base oil at the temperature of 80-120 ℃, heating, dispersing and mixing, heating to the temperature of 180-180 ℃, keeping for 10 minutes, cooling to the temperature of 150-180 ℃, keeping for 10 minutes, and finally cooling to the room temperature for homogenization.
As a preferred embodiment, the thickening agent is used in an amount of 10 wt.% to 30 wt.% based on the mass of the base oil. When the consumption of the thickening agent is less than 10%, the consistency is insufficient, and when the consumption of the thickening agent is more than 30%, the lubricating grease composition is too hard and is not suitable for use.
As a preferred embodiment, the base oil is one or a mixture of mineral oil, synthetic hydrocarbon, PAO, synthetic ester oil, polyether and polysiloxane.
The invention has the beneficial effects that: the prefabricated thickening agent containing the high-efficiency antifriction and antiwear nano-zinc oxide can realize the pre-preparation of the nano-additive and the thickening agent in one step, improve the reaction efficiency and realize the good dispersion of the small-size nano-zinc oxide in the lubricating grease. Meanwhile, the lubricating grease composition obtained by the prefabricated thickening agent has excellent antifriction and antiwear effects and remarkably improved low-temperature rheological property.
Meanwhile, the nano zinc oxide is used as a surface repairing agent, so that the friction pair can be effectively protected at the initial starting stage of the friction pair, and the service life and the grease replacement period are effectively prolonged. The lubricating grease composition obtained by the invention has better adaptability to various common additives such as an antioxidant, an extreme pressure antiwear agent, an anticorrosive agent and the like, and can contain various additives according to the common dosage according to the requirement.
Drawings
FIG. 1 is a flow chart of a preparation process of a prefabricated thickening agent containing an efficient antifriction and antiwear nano zinc oxide additive according to the invention;
FIG. 2 is a flow chart of a preparation process of the lubricating grease composition containing the high-efficiency antifriction and antiwear nano zinc oxide additive prefabricated thickener according to the present invention;
FIG. 3 is a scanning electron micrograph of a pre-fabricated thickener containing a highly effective anti-friction, anti-wear nano-additive obtained in example 1;
FIG. 4 is an XRD pattern of a pre-formed thickener containing a high-efficiency friction-reducing and anti-wear nano-additive obtained in example 1;
fig. 5 is a rheology diagram of the grease compositions obtained in examples 2 and 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: prefabricated thickening agent containing nano zinc oxide
Referring to the process flow shown in figure 1, 10.00g of 12-hydroxy zinc stearate and 0.10g of phenolphthalein as acid-base indicators were dissolved in 20-50mL of ethanol, and 1.27g of LiOH. H2Preparation of O into ethanolMixing with water, and adding LiOH.H at 80 deg.C2The solution O is slowly and dropwise added into the 12-hydroxy zinc stearate system until the reaction end point is reached. And (3) after the system continuously reacts for 2 hours, filtering, separating and washing the solid powder (5 times, 20mL of ethanol is used for washing each time), and drying at 60 ℃ to obtain solid powder, namely the prefabricated thickening agent powder containing the nano zinc oxide. The microstructure and XRD data of the obtained preformed thickener are shown in figure 3 and figure 4. As can be seen from the attached figure 3, the nano zinc oxide material is distributed among the micron-sized soap fibers, and the size of the nano zinc oxide material is dozens of nanometers of spherical shape. As can be seen from FIG. 4, the peak appearing at 5 ℃ to 15 ℃ corresponds to the characteristic peak of lithium 12-hydroxystearate (00-004-0352), and the peak appearing at 30 ℃ to 70 ℃ corresponds to the characteristic peak of zinc oxide (36-1452), indicating that the reaction successfully obtained a preformed soap containing lithium 12-hydroxystearate and nano-zinc oxide.
Example 2: preparation of blank comparative grease composition
Referring to the process flow shown in the attached figure 2, 10.0g of the soap powder 12-hydroxy lithium stearate which is a prefabricated thickener and does not contain nano zinc oxide is added into 80g of synthetic ester base oil diisooctyl sebacate (the kinematic viscosity is 25mPa.s at 20 ℃) at 100 ℃, the temperature of the system is raised to 210 ℃ after stirring and mixing for 20-30 minutes, and the system is kept for 10 minutes in a slightly transparent state at the moment. And then, cooling to 180 ℃ for 30 minutes, slowly cooling to room temperature, and grinding and homogenizing to obtain the lubricating grease composition.
Example 3: preparation of a grease composition
Referring to the process flow shown in the attached figure 2, 10.0g of the thickener of example 1 is added into 80g of synthetic ester base oil diisooctyl sebacate (kinematic viscosity: 25mPa.s at 20 ℃) at 100 ℃, stirred and mixed for 20-30 minutes, and then the system is heated to 210 ℃, and then the system is in a slightly transparent state and is kept for 10 minutes. And then, cooling to 180 ℃ for 30 minutes, slowly cooling to room temperature, and grinding and homogenizing to obtain the lubricating grease composition. As can be seen from fig. 5, the grease composition containing nano zinc oxide has a lower viscosity in a low temperature region, and shows better low temperature fluidity. And has better thixotropy and structural recoverability.
Example 4: preparation of a grease composition
Referring to the process scheme shown in FIG. 2, 14.0g of the thickener pre-soap of example 1 was added to 80g of 150BS base oil at 100 ℃ (kinematic viscosity: 550mm at 40 ℃)2S) of the above components, stirring and mixing the mixture for 20 to 30 minutes, and then heating the system to 200 ℃ to maintain the system in a slightly transparent state for 10 minutes. And then, cooling to 170 ℃ for 30 minutes, slowly cooling to room temperature, and grinding to homogenize to obtain the grease composition.
Example 5: preparation of a grease composition
Referring to the process shown in FIG. 2, 24.0g of the thickener pre-soap of example 1 was added to 80g of PAO at 100 ℃ with stirring (kinematic viscosity: 10 centistokes at 100 ℃), and after mixing for 20 to 30 minutes, the system was heated to 210 ℃ where it was in a slightly transparent state and held for 10 minutes. And then, cooling to 170 ℃ for 30 minutes, slowly cooling to room temperature, and grinding to homogenize to obtain the grease composition.
Comparative example 1:
referring to the process scheme shown in FIG. 2, 12.4g of lithium 12-hydroxystearate and 1.6g of zinc oxide were added to 80g of 150BS base oil at 100 ℃ (kinematic viscosity: 550mm at 40 ℃)2S) of the above components, stirring and mixing the mixture for 20 to 30 minutes, and then heating the system to 200 ℃ to maintain the system in a slightly transparent state for 10 minutes. And then, cooling to 170 ℃ for 30 minutes, slowly cooling to room temperature, and grinding to homogenize to obtain the grease composition.
The evaluation results of the properties of the grease compositions obtained in examples 2 to 4 of the present invention are shown in Table 1.
TABLE 1 evaluation results of grease composition Properties
Figure BDA0002883798440000071
Table 2 grease composition tribology testing
Figure BDA0002883798440000072
As can be seen from the comparison of example 2 and example 3, the grease compositions containing the nano zinc oxide additive are effective in reducing the coefficient of friction, and in particular the wear volume and wear scar diameter, in the SRV test and the four ball long wear test, compared to the blank composition. As can be seen from the comparison of example 4 and comparative example 1, the grease of comparative example 1 in which the nano zinc oxide additive was additionally added had inferior tribological performance to the direct method of example 4, in which the SRV test showed a large friction coefficient and wear scar diameter, while the comparative example of the four-ball test showed a slightly higher friction coefficient and wear scar diameter. The results show that the nano zinc oxide in the grease composition prepared by the external method has poor dispersion effect and the tribology performance is poorer than that of in-situ preparation. The above data indicate that the in situ prepared nano zinc oxide additive grease composition has excellent tribological performance.
The invention has the beneficial effects that: the invention relates to a prefabricated thickening agent of a high-efficiency antifriction and antiwear nano zinc oxide additive, which is used for common base oil, such as mineral oil, synthetic hydrocarbon, PAO, polyether, polysiloxane, synthetic ester oil and the like, and the obtained lubricating grease composition has good antifriction and antiwear tribological effects and good low-temperature rheological property. The nanometer zinc oxide prefabricated soap thickening agent can effectively improve the friction reduction and wear resistance of lubricating grease, improve the corrosion resistance and effectively prolong the service life of the lubricating grease composition. The lubricating grease composition obtained by the invention has better adaptability to various common additives such as an antioxidant, an extreme pressure antiwear agent, an anticorrosive agent and the like, and can contain various additives according to the common dosage according to the requirement.
The traditional nano additive is generally added into the lubricating grease by an external addition method, and then nano materials are dispersed by various dispersion means. The dispersion is not uniform, and the additional consumption is often caused. In addition, improper selection of a dispersing means or the like may have various effects on the physical and chemical properties of the subsequent grease. The preparation method realizes the preparation of the nano zinc oxide and the 12-lithium hydroxystearate through one-step reaction, ensures the dispersion between the nano material and the thickener soap fiber, and can also ensure good fat forming effect. Tribology tests show that the lubricating grease composition containing the nano zinc oxide prefabricated thickening agent has excellent friction reduction and wear resistance effects, can effectively protect a friction pair, and further prolongs the service life and the grease replacement period.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The prefabricated thickening agent containing nano zinc oxide is characterized by comprising 12-zinc hydroxystearate and LiOH2The O reaction is carried out, and the reaction process is as follows:
Figure FDA0003368459730000011
2. the prefabricated thickening agent containing nano zinc oxide as claimed in claim 1, wherein the specific preparation method of the thickening agent is as follows: adding zinc 12-hydroxystearate into solvent at 60-90 deg.C, dispersing in the above solvent, and adding 1-5 wt.% of LiOH. H within 30 min2And (3) reacting the O solution with the system for 2-4h, filtering, and drying to obtain solid powder, namely the lubricating grease prefabricated thickening agent containing the nano zinc oxide additive.
3. The pre-formed thickener containing nano zinc oxide as claimed in claim 1, wherein the zinc 12-hydroxystearate is mixed with LiOH2The molar ratio of O is 1: 1.5-1: 2.2.
4. The preformed thickener containing nano zinc oxide as claimed in claim 2, which is prepared by mixing the above raw materialsCharacterized in that the solvent is one or a mixture of two of ethanol and water, LiOH2O solution is LiOH2And O, ethanol and water or a mixture of the two.
5. A grease composition containing the nano zinc oxide preformed thickener of claim 1, wherein the composition comprises a base oil and the high efficiency friction reducing, anti-wear nano zinc oxide additive preformed thickener of claim 1.
6. The grease composition containing the nano zinc oxide pre-formed thickener of claim 1 as claimed in claim 5, wherein the grease composition is prepared by the following method: adding the prefabricated soap thickening agent containing nano zinc oxide as described in claim 1 into base oil at 80-120 ℃, heating, dispersing and mixing, heating to 180-220 ℃ for 10 minutes, cooling to 150-180 ℃ for 10 minutes, and finally cooling to room temperature for homogenization.
7. The grease composition containing the nano zinc oxide pre-formed thickener according to claim 1, wherein the thickener is used in an amount of 10 wt.% to 30 wt.% based on the mass of the base oil according to claim 5.
8. The grease composition containing the prefabricated thickening agent of nano zinc oxide as claimed in claim 1, according to claim 6, wherein the base oil is one or a mixture of mineral oil, synthetic hydrocarbon, PAO, synthetic ester oil, polyether and polysiloxane.
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