阅读说明：本技术 润滑油改性助剂及其制备方法与应用 (Lubricating oil modification auxiliary agent and preparation method and application thereof ) 是由 何亮 谢盛辉 刘栋材 肖春林 廖相 于 2020-06-08 设计创作，主要内容包括：本申请提供了一种润滑油改性助剂,所述润滑油改性助剂包括以氟化膨胀石墨为担体,以及吸附在所述担体表面的永磁材料颗粒,所述润滑油改性助剂为蠕虫状。该润滑油改性助剂摩擦系数低、润滑效果好、吸附能力强有助于润滑油的改性处理,提高润滑油在低温条件下的润滑性能,从而杜绝了低温及常温下因为启动冲击而造成的共振啸叫的问题。(The application provides a lubricating oil modification auxiliary agent, which comprises expanded graphite fluoride serving as a supporter and permanent magnet material particles adsorbed on the surface of the supporter, wherein the lubricating oil modification auxiliary agent is vermiform. The lubricating oil modification auxiliary agent has low friction coefficient, good lubricating effect and strong adsorption capacity, is beneficial to modification treatment of lubricating oil, and improves the lubricating performance of the lubricating oil under the low-temperature condition, thereby avoiding the problem of resonance squeal caused by starting impact at low temperature and normal temperature.)

1. The lubricating oil modification auxiliary agent is characterized by comprising expanded graphite fluoride serving as a support and permanent magnet material particles adsorbed on the surface of the support, wherein the lubricating oil modification auxiliary agent is vermicular.

2. The lubricating oil modification aid according to claim 1, wherein the mass ratio of the fluorinated expanded graphite support to the permanent magnet material particles is (5-8): 1.

3. the lubricant oil modification aid of claim 1 or 2, wherein the expanded density of the fluorinated expanded graphite is 200 to 300 mL/g.

4. The lubricating oil modification aid according to claim 1 or 2, wherein the permanent magnet material is selected from ferroferric oxide particles, and the particle size of the ferroferric oxide particles is 400-600 meshes.

5. A preparation method of a lubricating oil modification auxiliary agent is characterized by comprising the following steps:

providing fluorinated expanded graphite;

and mixing the fluorinated expanded graphite with permanent magnet material particles to obtain a first mixture, and performing ball milling treatment and magnetizing treatment on the first mixture to obtain the lubricating oil modification aid.

6. The method for preparing a lubricant oil modification aid according to claim 5,

the method for fluorinating the expanded graphite comprises reacting the expanded graphite at the temperature of 300-500 ℃ for 12-14 hours.

7. The method for preparing a lubricant oil modification aid according to claim 5,

the method for ball-milling the first mixture comprises the following steps: providing grinding balls, mixing the grinding balls with the first mixture, and reacting for 0.5-1 h under the condition of ball milling processing frequency of 1000-2000 r/min; wherein the mass ratio of the grinding balls to the first mixture is 1: (1-1.2).

8. The method for preparing the lubricant oil modification aid according to any one of claims 5 to 7, wherein N is₂And F₂The gas volume of (a) is 1: (3-5).

9. The modified lubricating oil is characterized in that the modified lubricating oil takes perfluoropolyether lubricating oil as base oil and takes lubricating oil modification auxiliary agent as additive; the lubricating oil modification auxiliary agent is the lubricating oil modification auxiliary agent disclosed in any one of claims 1-4 or prepared by the preparation method of the lubricating oil modification auxiliary agent disclosed in any one of claims 5-8.

10. The modified lubricating oil of claim 9, wherein the lubricating oil modifying additive is present in an amount of 0.1 to 3 wt.%, based on 100 wt.% of the total modified lubricating oil.

Technical Field

The application belongs to the technical field of lubricating oil, and particularly relates to a lubricating oil modification auxiliary agent, a preparation method thereof and modified lubricating oil.

Background

For the current automobile industry, the design of powder metallurgy bearings is generally adopted at the non-torque output end of small motors matched with an electronic parking system (EPB) and the like. The powder metallurgy bearing is a porous material, and is mostly a Cu-Zn system determined by the load, the rotating speed and the like of a small automobile motor, lubricating oil can be sucked in under a vacuum condition by utilizing the capillary action, and the lubricating oil is released to form a lubricating film through the pumping action and the thermal expansion action in the working process. Based on safety considerations, perfluoropolyether with stable chemical properties and excellent lubricating comprehensive properties is selected as the lubricating oil of the powder metallurgy bearing in the current automobile mainstream, and the conventional lubricating oil such as alkanes and esters is rarely selected.

Based on the requirements of safety and comfort, the temperature requirement of the general automobile motor industry is to meet the related performance and noise requirements in a larger temperature range of-40-120 ℃. However, since the lubricating oil is a liquid polymer, the viscosity thereof rapidly increases with the decrease of the temperature, and the fluidity thereof is significantly deteriorated, so that dry friction is generated at the starting stage of the motor at a low temperature due to the lack of effective lubrication, and a significant starting noise is generated, and even the resonance of the whole motor may be excited, thereby causing a squeaking abnormal sound.

Due to the particularity of the automobile industry, perfluoropolyether is selected as lubricating oil for most porous powder metallurgy bearings, perfluoropolyether (PFPE) is novel fluorine synthetic oil, and on the basis of hydrocarbons, C-H bonds in original hydrocarbons are replaced by extremely strong C-F bonds and coexist with original C-O and C-C strong covalent bonds. Meanwhile, the strong electronegativity of the F atom causes the strong polarity of an F-C bond, and the shared electron pair is biased to the F atom, so that the F atom has redundant negative charges to form a negative charge protective layer, thereby having extremely low surface tension and very good chemical stability, being a lubricating material with good lubricity and high reliability and being commonly used as a lubricating medium under some harsh conditions. However, due to the extremely strong C-F bond of the perfluoropolyether, the perfluoropolyether has strong repulsion to conventional molybdenum disulfide, graphite and other solid lubricating additives, so that the perfluoropolyether lubricating oil has poor lubricity at low temperature, so that dry friction and resonance squeaking of the bearing occur, and the lubricating performance is poor.

Disclosure of Invention

The application aims to provide a lubricating oil modification auxiliary agent and a preparation method thereof, and aims to solve the problem that perfluoropolyether lubricating oil in the prior art is poor in lubricity at low temperature.

In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:

in a first aspect, the present application provides a lubricating oil modification aid, which comprises expanded graphite fluoride as a support and permanent magnet material particles adsorbed on the surface of the support, wherein the lubricating oil modification aid is vermiform.

In a second aspect, the present application provides a method for preparing a lubricant modifying additive, comprising the steps of:

providing fluorinated expanded graphite;

and mixing the fluorinated expanded graphite with permanent magnet material particles to obtain a first mixture, and performing ball milling treatment and magnetizing treatment on the first mixture to obtain the lubricating oil modification aid.

In a third aspect, the present application provides a modified lubricating oil, wherein the modified lubricating oil uses perfluoropolyether lubricating oil as base oil and uses a lubricating oil modification auxiliary agent as an additive; the lubricating oil modification auxiliary agent is the lubricating oil modification auxiliary agent or is prepared by the preparation method of the lubricating oil modification auxiliary agent.

According to the lubricating oil modification auxiliary agent provided by the first aspect of the application, fluorinated expanded graphite is used as a supporter, on one hand, an outer-layer electronic structure of the fluorinated expanded graphite is a C-F bond with very strong polarity, the compatibility with lubricating oil is good, and a stable modified mixture can be formed after mixing; on the other hand, the fluoridized expanded graphite has low interlayer bonding energy, low friction coefficient, good self-lubricating property and high specific surface area, can adsorb liquid lubricating oil, further reduces the friction coefficient of the lubricating oil, improves the stability and reduces the noise; in addition, the lubricating oil modifying auxiliary agent also comprises permanent magnet material particles, and the permanent magnet material particles enable the lubricating oil modifying auxiliary agent to be adsorbed between the bearing and the rotating shaft, so that the friction strength is reduced; the obtained lubricating oil modification auxiliary agent is worm-shaped, has high specific surface, loose structure, high flexibility and plasticity, strong adsorption capacity and good adsorption effect in the using process, is beneficial to modification treatment of lubricating oil, and improves the lubricating performance of the lubricating oil under the low-temperature condition, thereby avoiding the problem of resonance squeal caused by starting impact at low temperature and normal temperature.

In the preparation method of the lubricating oil modification auxiliary agent provided by the second aspect of the application, the fluorinated expanded graphite is used as a raw material, and then is mixed with the permanent magnet material particles and subjected to post-treatment; the preparation method is simple and convenient to operate, does not need complex equipment, and is favorable for wide application.

In the third aspect of the present application, a modified lubricating oil is provided, where the modified lubricating oil uses perfluoropolyether lubricating oil as base oil and a lubricating oil modification auxiliary as an additive; the lubricating oil modification auxiliary agent has high lubricity, low friction coefficient and good adsorption effect, and the lubricating property of the modified lubricating oil obtained by modifying the lubricating oil modification auxiliary agent is improved, so that the problem of resonance squeal caused by starting impact at low temperature and normal temperature is solved.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The weight of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass in the description of the embodiments of the present application may be in units of mass known in the chemical industry, such as μ g, mg, g, and kg.

The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In a first aspect of the embodiments of the present application, a lubricant modification aid is provided, where the lubricant modification aid includes expanded graphite fluoride as a support, and permanent magnetic material particles adsorbed on the surface of the support, and the lubricant modification aid is worm-shaped.

The lubricating oil modification auxiliary agent provided by the application takes the fluorinated expanded graphite as a supporter, can be well compatible and mixed with lubricating oil, has low friction coefficient and high self-lubricating property, and can further reduce the friction coefficient of the lubricating oil, improve the stability and reduce the noise; the adsorbed permanent magnetic material particles have permanent magnetism, so that the lubricating oil modification auxiliary agent can be adsorbed between the bearing and the rotating shaft, and the friction strength is reduced; the obtained lubricating oil modification auxiliary agent is worm-shaped, has high specific surface, loose structure, high flexibility and plasticity, strong adsorption capacity and good adsorption effect in the using process, is beneficial to modification treatment of lubricating oil, and improves the lubricating performance of the lubricating oil under the low-temperature condition, thereby avoiding the problem of resonance squeal caused by starting impact at low temperature and normal temperature.

Specifically, the lubricating oil modification auxiliary agent takes fluorinated expanded graphite as a supporter, and the fluorinated expanded graphite means that fluorine enters graphite interlayers of the expanded graphite and is combined with carbon atoms to form C-F bonds with stronger polarity. On one hand, the fluorinated expanded graphite has a similar outer-layer electronic structure with a common perfluoropolyether material in lubricating oil, is a C-F bond with very strong polarity, has good compatibility and can form a stable modified mixture with the lubricating oil; on the other hand, the fluorinated expanded graphite has low interlayer bonding energy which is only 2kcal/mol and is far lower than 6kcal/mol of graphite, and meanwhile, the fluorinated expanded graphite has low friction coefficient, good self-lubricating property and high specific surface area, can adsorb liquid lubricating oil, further reduces the friction coefficient of the lubricating oil, improves the stability of the lubricating oil and reduces noise.

Preferably, the expansion volume of the fluorinated expanded graphite is 200-300 mL/g, and the expansion volume of the fluorinated expanded graphite is controlled, so that the adsorption capacity of the permanent magnet material particles is favorably ensured, the adsorption capacity of the lubricating oil modified by the lubricating oil modification auxiliary agent and the bearing is further improved, and the friction property of the modified lubricating oil is reduced.

Specifically, the lubricating oil modification auxiliary agent comprises permanent magnet material particles adsorbed on the surface of a support. Preferably, the permanent magnetic material is selected from ferroferric oxide particles and ferroferric oxide (Fe)₃O₄) In which Fe is contained²⁺And Fe³⁺，Fe²⁺With Fe³⁺The ferroferric oxide is basically arranged in disorder on an octahedron position, and electrons can be rapidly transferred between two oxidation states of iron, so that the ferroferric oxide solid can be permanently magnetized after being magnetized and has permanent magnetism; the particles with permanent magnetism are loaded between the layers of the fluorinated expanded graphite, so that the particles are firm in loading, difficult to fall off and uniform in dispersion; can be uniformly dispersed in the lubricating oil, and has the function of modifying the lubricating oil. In use, Fe with magnetism₃O₄The powder can adsorb the fluorinated expanded graphite in the fixed area of the rotating shaft, thereby avoiding the loss and the drift of the fluorinated expanded graphite and effectively prolonging the lubricating life of the fluorinated expanded graphite.

Preferably, the particle size of the ferroferric oxide particles is 400-600 meshes; the particle size of the ferroferric oxide particles is controlled, so that the ferroferric oxide can be well adsorbed between layers of the fluorinated expanded graphite, and the ferroferric oxide is high in adsorption force and dispersibility; meanwhile, the particle size is controlled to be moderate, rigid support is not formed in the using process, the friction performance is lower, and the noise improvement effect is improved.

Preferably, the mass ratio of the fluorinated expanded graphite supporter to the permanent magnet material particles is (5-8): 1; the mass ratio of the fluorinated expanded graphite supporter to the permanent magnet material is controlled, the moderate addition amount of the permanent magnet material particles is ensured, the magnetism of the permanent magnet material particles can be better ensured, and the adsorption capacity of the modified lubricating oil is ensured to be higher; meanwhile, the particles of the permanent magnetic material are uniformly dispersed, agglomeration is not easy to occur, and the lower friction performance is ensured.

The worm-shaped lubricating oil modifying auxiliary agent is worm-shaped, has a high specific surface and a loose structure, can be automatically embedded, increases the flexibility and plasticity, can quickly form a layer of soft fixed lubricating film between a shaft and a bearing, has strong adsorption capacity and good adsorption effect in the using process, is beneficial to modification treatment of lubricating oil, improves the lubricating performance of the lubricating oil under the low-temperature condition, and avoids the problem of resonance squeal caused by starting impact at low temperature and normal temperature.

The second aspect of the embodiments of the present application provides a method for preparing a lubricant modification auxiliary, including the following steps:

s01, providing fluorinated expanded graphite;

s02, mixing the fluorinated expanded graphite with the permanent magnet material particles to obtain a first mixture, and performing ball milling and magnetizing treatment on the first mixture to obtain the lubricating oil modification aid.

The preparation method takes expanded graphite as a raw material, and the expanded graphite is subjected to fluorination treatment; then mixing the magnetic particles with the permanent magnetic material particles and carrying out post-treatment; the preparation method is simple and convenient to operate, does not need complex equipment, and is favorable for wide application.

Specifically, in the step S01, expanded graphite is provided, and the method for preparing expanded graphite includes: the graphite is used as a raw material and can be prepared by any method selected from a chemical intercalation method, an electrochemical method, a gas-phase diffusion method and the like.

In the specific embodiment of the invention, the expanded graphite is prepared by a chemical intercalation method; the preparation method comprises the following steps:

s011, mixing flake graphite and H₂SO₄And KMnO₄Reacting at 100 deg.C hydrothermal temperature for 1 hr to obtain first mixture containing scale graphite and H₂SO₄And KMnO₄The mass ratio of (1): 5: 3;

s012. adding H into the first mixture₂O₂Reacting at 100 deg.C hydrothermal temperature for 5 hr to obtain a second mixture, wherein crystalline flake graphite and H₂O₂The mass ratio of (1): 7;

s013, drying the second mixture, and then performing expansion treatment at 800-.

In the step S011, preferably, both potassium permanganate and sulfuric acid are oxidizing agents for increasing the distance between graphite layers and reducing the potential barrier of intercalation reaction, and by controlling the addition amount of the oxidizing agents and the sulfuric acid, the obtained mixture is further ensured to have strong oxidizing property, which is beneficial to the reaction.

Further preferably, flake graphite and H are mixed₂SO₄And KMnO₄And reacting at 100 deg.c hydrothermal temperature for 1 hr to obtain the first mixture, and the reaction process is mainly to increase the interval between graphite layers and lower the reaction barrier for subsequent intercalation.

In the above step S012, H is provided₂O₂The intercalation agent is added to react for 5 hours at the hydrothermal temperature of 100 ℃, so that the intercalation agent can be rapidly decomposed, and the graphite expands along the C axis direction to generate the expanded graphite.

Further, providing N₂And F₂The expanded graphite is subjected to fluorination treatment in the mixed atmosphere to obtain the fluorinated expanded graphite. Preferably, N₂And F₂The gas volume of (a) is 1: (3-5), continuously introducing flowing mixed gas, and ensuring that no other impurity gas exists in the reaction process to further influence the reaction process.

Preferably, the method for fluorinating the expanded graphite comprises reacting the expanded graphite at 300-500 ℃ for 12-14 hours. The reaction temperature is controlled to be 300-500 ℃, the reaction driving force of the fluorination reaction is high, the fluorination degree is complete, the reaction is carried out at the reaction temperature, the danger index is low, and the reaction effect is good. The reaction time is controlled to be 12-14 hours, the fluorination degree is ensured to be complete, and the lubricating effect of the obtained product is better.

In a preferred embodiment of the invention, control N₂And F₂The gas volume of (a) is 1: 3, reacting the expanded graphite for 12 hours at the temperature of 300-500 ℃ in a mixed atmosphere to perform fluorination treatment to obtain fluorinated expanded graphite; the fluorine-carbon ratio of the obtained fluorinated expanded graphite is 330.6-1.0.

In the step S02, the fluorinated expanded graphite and the permanent magnet material particles are mixed to obtain a first mixture, and the mass ratio of the fluorinated expanded graphite support to the permanent magnet material particles is preferably (5 to 8): 1; the mass ratio of the fluorinated expanded graphite supporter to the permanent magnet material particles is controlled, the moderate addition amount of the permanent magnet material particles is ensured, the magnetism of the permanent magnet material particles can be better ensured, and the adsorption capacity of the modified lubricating oil is improved; meanwhile, the particles of the permanent magnetic material are uniformly dispersed, agglomeration is not easy to occur, and the lower friction performance is ensured.

In a preferred embodiment of the invention, the permanent magnetic material is selected from ferroferric oxide particles.

Further, ball-milling the first mixture is carried out, ball-milling treatment is carried out, and the permanent magnet material particles are pressed into the fluorinated expanded graphite through mechanical energy of a grinding ball, so that the permanent magnet material particles are adsorbed in the graphite layers of the fluorinated expanded graphite.

Preferably, the ball milling treatment method comprises: providing grinding balls, mixing the grinding balls with the first mixture, and reacting for 0.5-1 h under the condition of ball milling processing frequency of 1000-2000 r/min; wherein the mass ratio of the grinding ball to the first mixture is 1: (1-1.2). The frequency and the reaction time of the ball milling treatment are controlled, the fluorinated expanded graphite supporter is ensured not to be mechanically sheared due to the ball milling treatment, the integrity of the supporter can be kept, and meanwhile, the permanent magnet material particles are ensured to be uniformly loaded between graphite layers of the fluorinated expanded graphite.

In a preferred embodiment of the present invention, the grinding balls are selected from zirconia grinding balls, and the mass ratio of the grinding balls to the first mixture is 1: 1; the mass ratio of the grinding balls to the first mixture is controlled, so that the ball milling effect is better, and the permanent magnet material particles can be uniformly dispersed.

Further, after ball milling treatment is carried out on the first mixture, magnetizing treatment is carried out to obtain the lubricating oil modification auxiliary agent, and the purpose of magnetizing treatment is to enable the permanent magnetic material particles to have permanent magnetism so as to achieve the adsorption effect. In a preferred embodiment of the present invention, the method for performing the magnetizing process includes: the method comprises the steps of filling fluorinated expanded graphite embedded with permanent magnet material particles into a plastic container, sealing, placing the plastic container into a hollow spiral coil, and introducing a pulse magnetic field not lower than 1000KA/m to magnetize the permanent magnet material particles so as to obtain magnetism.

In the third aspect of the embodiments of the present application, a modified lubricating oil is provided, where the modified lubricating oil uses perfluoropolyether lubricating oil as base oil and a lubricating oil modification auxiliary as an additive; wherein the lubricating oil modification auxiliary is a lubricating oil modification auxiliary or is prepared by a preparation method of the lubricating oil modification auxiliary.

The modified lubricating oil provided by the application takes perfluoropolyether lubricating oil as base oil and takes a lubricating oil modification auxiliary agent as an additive; the lubricating oil modification auxiliary agent has high lubricity, low friction coefficient and good adsorption effect, and the lubricating property of the modified lubricating oil obtained by modifying the lubricating oil modification auxiliary agent is improved, so that the problem of resonance squeal caused by starting impact at low temperature and normal temperature is solved.

Preferably, the weight percentage of the lubricating oil modification auxiliary agent is 0.1-3 percent based on the total weight of the modified lubricating oil as 100 percent; the addition amount of the modification auxiliary agent of the lubricating oil is controlled to be moderate, so that the lubricating oil can be improved, the lubricating property and the adsorption property of the lubricating oil are improved, and the friction coefficient of the lubricating oil is reduced on the premise of not influencing the performance of the lubricating oil.

In a preferred embodiment of the present invention, the method of preparing the modified lubricating oil comprises the steps of: mixing perfluoropolyether lubricating oil and a lubricating oil modification auxiliary agent, and carrying out magnetic stirring for 1-1.2 hours; and then placing the mixture in a sealed container, vacuumizing to a vacuum degree below-80 KPa, and keeping for 1-2 hours to ensure that the lubricating oil modification auxiliary agent and the perfluoropolyether lubricating oil are uniformly mixed.

In some embodiments, the modified lubricating oil is widely used in the pre-treatment of powder metallurgy bearings.

Preferably, the vacuum oil immersion treatment of the powder metallurgy bearing is completed by using the modified lubricating oil according to the conventional production process, and comprises the following steps: mixing the powder metallurgy bearing and the modified lubricating oil, vacuumizing to a vacuum degree below-80 KPa, and keeping the vacuum degree for 0.5-1 hour to ensure that the modified lubricating oil can enter the capillary holes of the porous powder metallurgy bearing, thereby completing the process of vacuum oil immersion.

Further, the subsequent motor assembling and detecting process is completed according to the conventional process. Specifically, the powder metallurgy bearing is placed at a fixed position of a motor shell, is fixed by using a pressing sheet and the like, and then enters the processes of shaft installation and the like, and finally the assembly and the test of the motor are completed.

The modified lubricating oil obtained by modifying the lubricating oil modification additive disclosed by the invention is used for treating the powder metallurgy bearing, and has the following beneficial effects: firstly, because the lubricating oil modification auxiliary agent is worm-shaped, the flexibility, plasticity and adsorptivity of the modified lubricating oil are improved, the dimension of the size of the lubricating oil modification auxiliary agent is higher than that of a capillary hole of a powder metallurgy bearing, so that the lubricating oil modification auxiliary agent is better adsorbed on the surface of the bearing, and after the assembly is finished, the lubricating oil modification auxiliary agent can be automatically and quickly adjusted and deformed according to the appearance, tolerance and the like between a shaft and the bearing in the power-on initial detection stage of a motor, so that a soft fixed lubricating film is quickly formed between the shaft and the bearing, the dry friction of the motor can be avoided in the low-temperature starting stage, the instant resonance excitation source generated in the starting stage is avoided, and the low; secondly, the lubricating oil modification auxiliary agent is added, and the high specific surface property of the fluorinated expanded graphite is utilized, so that the fluorinated expanded graphite adsorbs the liquid perfluoropolyether lubricating oil under the assistance of vacuum, the friction coefficient of the modified lubricating oil is greatly reduced, the stability of the motor in the low-temperature rotation period is improved, and the comprehensive noise can be reduced by 3-5dB, so that the low-temperature and normal-temperature comprehensive noise level of the motor is greatly improved, and the comfort of a user is improved; thirdly, the lubricating oil modification auxiliary agent comprises permanent magnet material particles, the permanent magnet material particles have certain magnetism after being magnetized, and the motor shaft is generally made of medium carbon steel tensile bars or martensitic stainless steel processing shafts, which are made of high magnetic conductivity materials. After the motor assembly, take magnetic permanent magnet material granule can with the gradual enrichment of fluorinated expandable graphite on the axle, form the very low solid lubrication film of coefficient of friction between powder metallurgy bearing and pivot more easily in the basic performance test process of motor, avoided the start-up stage because perfluoropolyether lubricating oil in the capillary has not yet oozed and dry friction appears, thereby stopped low temperature and normal atmospheric temperature and strikeed the resonance squeaking that causes because start-up, in addition, take magnetic permanent magnet material granule can adsorb fluorinated expandable graphite in the fixed area of pivot, avoid fluorinated expandable graphite's loss and drift, effectively prolong its lubricated life-span and effect.

The following description will be given with reference to specific examples.