阅读说明：本技术 均苯二酸酰胺类小分子凝胶剂、制备方法及其在凝胶润滑剂方面的应用 (Pyromellitic acid amide micromolecule gel, preparation method and application thereof in gel lubricant ) 是由 何宇鹏 包欢 于芳 李飞 张万年 张鸣园 于 2020-11-11 设计创作，主要内容包括：本发明属凝胶材料领域,尤其涉及一种均苯二酸酰胺类小分子凝胶剂、制备方法及其应用,结构式如下：其制备方法,按如下步骤实施：将均苯四甲酸二酐溶于无水丙酮,滴加正胺的丙酮溶液；将粗产物悬浮于丙酮,过滤收集固体产物；将滤饼悬浮于无水乙醇中,过滤收集固体产物,真空干燥后,即得目的产物。本发明可有效平衡或避开溶剂中质子溶剂对凝胶的结合能力的破坏,对极性质子溶剂耐受性较好,对羟基等质子溶剂不敏感。(The invention belongs to the field of gel materials, and particularly relates to a small molecule gel of pyromellitic acid amide, a preparation method and application thereof, wherein the structural formula is as follows: the preparation method comprises the following steps: dissolving pyromellitic dianhydride in anhydrous acetone, and dropwise adding an acetone solution of n-amine; suspending the crude product in acetone, filtering and collecting a solid product; suspending the filter cake in absolute ethyl alcohol, filtering and collecting a solid product, and drying in vacuum to obtain the target product. The invention can effectively balance or avoid the junction of the proton solvent in the solvent to the gelThe damage of synthetic ability is better to the polar proton solvent, and is insensitive to the proton solvent such as hydroxyl.)

1. A small molecule gel of pyromellitic acid amide is characterized in that the structural formula is as follows:

。

2. the preparation method of the pyromellitic acid amide micromolecule gel according to claim 1 is characterized by comprising the following steps:

(1) dissolving pyromellitic dianhydride in anhydrous acetone, slowly dropwise adding an acetone solution of n-amine at 0 ℃, stirring, and standing overnight at normal temperature;

(2) suspending the crude product in acetone, stirring at room temperature, filtering and collecting a solid product;

(3) repeating the step (2) for three times;

(4) suspending the filter cake obtained in the step (3) in absolute ethyl alcohol, stirring at room temperature, filtering and collecting a solid product;

(5) repeating the step (4) for three times;

(6) and (5) drying the solid compound obtained in the step (5) in vacuum to obtain the target product.

3. The preparation method of the pyromellitic acid amide micromolecule gel according to claim 2 is characterized in that: in the step (1), the acetone solution of n-amine is slowly dropped at 0 ℃, stirred for half an hour and then kept at normal temperature overnight.

4. The preparation method of the pyromellitic acid amide micromolecule gel according to claim 3, which is characterized by comprising the following steps: the n-amine in the step (1) is n-hexadecylamine.

5. The preparation method of the pyromellitic acid amide micromolecule gel according to claim 4, which is characterized in that: the molar ratio of the pyromellitic dianhydride to the n-amine in the step (1) is 2.2: 1.

6. The preparation method of the pyromellitic acid amide small-molecule gel according to claim 5, which is characterized in that: the crude product was suspended in 100ml of acetone in step (2), stirred at room temperature for 1 hour, and the solid product was collected by filtration.

7. The preparation method of the pyromellitic acid amide micromolecule gel according to claim 6, which is characterized in that: in the step (4), the filter cake is suspended in 100ml of anhydrous ethanol, stirred at room temperature for 1 hour, and filtered to collect a solid product.

8. The application of the small molecule gelata of the pyromellitic acid amide class in the aspect of gel lubricant is characterized by comprising the following steps: adding the pyromellitic acid amide micromolecule gel into the base oil, heating to dissolve, naturally cooling, and standing for more than 20 minutes to obtain the target product gel lubricant.

9. The application of the small molecule gelator of the pyromellitic acid amide class in the aspect of gel lubricant, which is characterized in that: the mass percentage content of the pyromellitic acid amide micromolecule gel is 1-10%; the mass percentage of the base oil is 90-99%; the heating and dissolving temperature is as follows: the heating time is 5-20 minutes at 120-200 ℃.

10. The application of the small molecule gelator of the pyromellitic acid amide class in the gel lubricant field according to claim 9 is characterized in that: the base oil is 500SN, 150BS, PAO10 or PAO 40.

Technical Field

The invention belongs to the field of gel materials, and particularly relates to a small molecule gel of pyromellitic acid amide, a preparation method and application thereof in gel lubricants.

Background

The small molecular organogel is a special dispersion system, and the gelators are intertwined with each other in a large amount of medium (liquid or gas) through self-assembly to form a spatial network structure; is a soft solid substance which is between solid and liquid and has dominant storage modulus. The small molecule organic gel can generate sensitive responsiveness to external stimuli such as force, light, pH value, temperature, sound wave and the like. Hamiltona.d. 2004 published a review entitled Water diagnosis by Small Organic Molecules summarizing the development of the last 20 years. The authors believe that the discovery and design of a new small molecule organogel is a rapidly evolving field of research, particularly as it may have a wide range of practical applications in materials, carriers for controlled and sustained release of drugs, and a broad prospect in the management of chemical contamination.

The main influencing factors of gel formation are the molecular structure of the small molecular organogel, hydrogen bonds among molecules, pi-pi stacking and other molecular interaction and solvent effect. Furthermore, the molecular terminal long-chain alkanes can be used to adjust their solubility and introduce van der waals forces in the system, increasing the gel properties. Meanwhile, the self-assembly process is greatly dependent on the structure of the solvent, which indicates that specific solvent molecules can promote the self-assembly of the gelator in the system to form gel.

The nature and the variety of the solvent have great influence on the self-loading form or the molecular recognition of the gel, but the small molecular organic gel is easily damaged by a single factor to influence the mechanical strength and the performance thereof, so that the offshore large-area floating oil cannot be dispersed into small oil drops, and the gel factor cannot completely surround the oil drops in water. Therefore, it is necessary to develop a gelator, which can regulate weak interaction force between molecules and change the configuration of molecular structure or arrangement of aggregation state by directional design of molecular structure, so that the gelator is not damaged by polar solvents such as ethanol and the like.

The lubricant is an important means for reducing the surface friction of mechanical devices, at present, people have strict requirements on the working condition stability and the service life of machinery, and the traditional lubricants (such as mineral-based lubricating oil, synthetic lubricant and synthetic lubricating ester) cause resource waste and environmental pollution due to the phenomena of leakage, creeping and the like. Therefore, the development of a series of new lubricants is urgent.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a monobasic structure of pyromellitic amide with gel property, which effectively balances or avoids the damage of proton solvent in solvent to the binding capacity of gel, provides enough hydrogen bonds and pi-pi accumulation for gelation, has better tolerance to polar proton solvent and is insensitive to proton solvents such as hydroxyl and the like, and a preparation method thereof.

The invention also provides application of the pyromellitic acid amide small-molecule gel in the aspect of gel lubricants.

In order to solve the technical problem, the invention is realized as follows:

a small molecule gel of pyromellitic acid amide has the following structural formula:

the preparation method of the pyromellitic acid amide micromolecule gel can be implemented according to the following steps:

(1) dissolving pyromellitic dianhydride in anhydrous acetone, slowly dropwise adding an acetone solution of n-amine at 0 ℃, stirring, and standing overnight at normal temperature;

(2) suspending the crude product in acetone, stirring at room temperature, filtering and collecting a solid product;

(3) repeating the step (2) for three times;

(4) suspending the filter cake obtained in the step (3) in absolute ethyl alcohol, stirring at room temperature, filtering and collecting a solid product;

(5) repeating the step (4) for three times;

(6) and (5) drying the solid compound obtained in the step (5) in vacuum to obtain the target product.

Further, in the step (1) of the present invention, an acetone solution of n-amine was slowly added dropwise at 0 ℃, stirred for half an hour and then allowed to stand at room temperature overnight.

Further, the n-amine in step (1) of the present invention is n-hexadecylamine.

Further, the molar ratio of pyromellitic dianhydride to n-amine in step (1) of the present invention is 2.2: 1.

Further, in step (2) of the present invention, the crude product was suspended in 100ml of acetone, stirred at room temperature for 1 hour, and the solid product was collected by filtration.

Further, in the step (4) of the present invention, the filter cake is suspended in 100ml of anhydrous ethanol, stirred at room temperature for 1 hour, and the solid product is collected by filtration.

The application of the pyromellitic acid amide micromolecule gel agent in the aspect of gel lubricants can be implemented according to the following steps: adding the pyromellitic acid amide micromolecule gel into the base oil, heating to dissolve, naturally cooling, and standing for more than 20 minutes to obtain the target product gel lubricant.

Furthermore, the mass percentage content of the pyromellitic acid amide micromolecule gel is 1-10%; the mass percentage of the base oil is 90-99%; the heating and dissolving temperature is as follows: the heating time is 5-20 minutes at 120-200 ℃.

Further, the base oil of the present invention may be selected from 500SN, 150BS, PAO10 or PAO 40. The invention discloses a pyromellitic acid amide micromolecule gel, which can overcome the defect that the gel taking intermolecular hydrogen bonds as a main driving force is easily damaged by some polar protic solvents, effectively balances or avoids the damage of the proton solvent in the solvent to the binding capacity of the gel by screening out a parent nucleus structure of the gel pyromellitic acid amide, introducing pi-pi stacking weak acting force and mutual coordination of the hydrogen bonds, provides enough hydrogen bonds and pi-pi stacking for the gelation, has better tolerance to the polar protic solvents, and can construct a series of novel gels insensitive to the proton solvents such as hydroxyl and the like.

The pyromellitic acid amide micromolecule gel has two configurations, the mechanism of the self-assembly form of the gel cannot be strictly researched, and the gel factor needs to be purified by a beating method to obtain the single-configuration gel factor.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention develops a series of gel factor gels of pyromellitic dianhydride, which have good gelling capacity for organic solvents such as benzene, toluene, diesel oil, liquid paraffin, n-hexadecane and the like.

2. The minimum gel concentration of the single-configuration pyromellitic dianhydride gel Preparation (PA) in liquid paraffin can reach 1.49 wt%, and the minimum gel concentration in diesel oil can reach 0.42 wt%.

3. According to the invention, through testing the lowest gel concentration of all synthesized gels, the gel factor synthesized by pyromellitic dianhydride and n-hexadecylamine has strong gelling capacity and mechanical strength.

4. The best compound ratio of the single-configuration gelator is 1: 0.4 (diesel), 1:0.6 (liquid paraffin), the lowest gel concentration of which is much less than 5 wt% (mass percent concentration) of the super gel.

5. According to the invention, through thermal scanning of paraffin gel, the absorption peak of single-component gel is 85.07 ℃, and the exothermic peak is 66.17 ℃; the heat absorption peak of the two-component gel was 95.65 ℃ and the heat release peak was 77.47 ℃. These data are all much higher than room temperature, indicating that these gels can be left for long periods of time at room temperature and that the two-component gels are more stable.

6. According to the invention, the mechanical strength of the paraffin gel is researched through rheological tests for respectively changing the vibration stress and the vibration frequency, the storage modulus (G ') of the paraffin gel is rapidly reduced after a critical strain area and is lower than the loss modulus (G'), which indicates that the gel undergoes gel-sol conversion, and the mechanical strength of the compounded gel is higher than that of a single-component gel.

7. According to the invention, through an X-ray powder diffraction spectrum, under the same concentration, the diffraction peak of the compounded gel is much lower than that of the non-compounded single-component gel, which indicates that the self-assembly form of the compounded gel is more disordered and complicated and the periodic diffraction peak is lower. The self-contained form of the gel is not completely changed by adding the ethanol, and the ethanol has strong damage to the single-component gel, so that the diffraction peak of the single-component gel is rapidly weakened, which shows that the single-component gel has lower effect on an anti-proton solvent, and the double-component gel has better tolerance to the ethanol.

8. The invention combines data of Fourier infrared spectrum and XRD, etc., and shows that the main driving force of the gel is pi-pi stacking effect, and the strong acting forces shorten the distance of formed intermolecular hydrogen bonds, so that the energy of the hydrogen bonds is high, and the characteristic absorption peaks all move to long wavelength, which is consistent with the original purpose of designing the gel.

9. According to the invention, through a scanning electron microscope image, the bi-component gel fiber is obviously thickened, which indicates that the gel structure is more stable than a single-component gel structure, after an alcohol solution is added, the gel structure is changed from a line winding structure into a sheet stacking structure, although the alcohol molecules destroy intermolecular hydrogen bonds, the self-assembly form of the gel is changed, the pi-pi stacking of the gel is a main driving force, and the gel system is not changed into a true solution by the ethanol.

10. Compared with the common supramolecular gel lubricant, the organic micromolecular gel lubricant has the advantages of extremely simple preparation method and low cost.

11. The organic micromolecule gel lubricant has excellent antifriction and antiwear performances.

Drawings

The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.

FIG. 1a is a DSC spectrum of paraffin gel of single-component single-configuration pyromellitic dianhydride gelator gel;

FIG. 1b is a DSC spectrum of paraffin gel of two-component single-configuration pyromellitic dianhydride type gelator;

FIG. 2a is a rheological test frequency sweep of Gel-C16A at 3 times MGC;

FIG. 2b is a rheological test stress sweep of Gel-C16A at 3 times MGC-rheological study of a diesel Gel;

FIG. 2C is a rheological test frequency sweep of Gel-C16A at 3 times MGC;

FIG. 2d is a rheological test stress sweep of Gel-C16A at 3 times MGC;

FIG. 3 is an XRD spectrum of a single-configuration pyromellitic dianhydride gel factor xerogel;

FIG. 4 is nuclear magnetic hydrogen spectrum of single-configuration pyromellitic dianhydride gel factor;

fig. 5a is a FESEM image of xerogel prepared at 3 x MGC (P in diesel);

fig. 5b is a FESEM image of xerogel prepared at 3 x MGC (P: a ═ 1:0.8 in diesel);

fig. 5c is a FESEM image of xerogel prepared at 3 x MGC (P in diesel and ethanol);

fig. 5d is a FESEM image of xerogel prepared at 3 x MGC (P: a ═ 1:0.8 in diesel and ethanol: v: v);

FIG. 6 is a COF curve of an experiment of the present invention-2% gel lubricant and a blank 150BS base oil at 100N-700N;

FIG. 7 is a COF curve of a gel lubricant of experiment two 150BS of the present invention;

FIG. 8 is a COF curve of an experimental triple gel lubricant and white oil 150BS base oil of the present invention;

FIG. 9 is a graph of the experimental four-organic small molecule gel lubricant and base oil with respect to anti-friction and anti-wear performance COF-time and temperature-time;

FIG. 10 is a DSC plot of a base oil of the present invention;

FIG. 11a is a microscope image of a base oil wear scar 50 times;

FIG. 11b is a microscope image of a 500-fold wear scar of a base oil according to the present invention;

FIG. 12a is a microscope image of the gel lubricant wear scar 50 times;

FIG. 12b is a microscopic image of a gel lubricant according to the present invention at 500 times wear scar.

Detailed Description

EXAMPLE 1 Synthesis of gel factor gelling agent of the pyromellitic dianhydride type

The compound pyromellitic dianhydride (1.00g, 4.58mmol) is taken and dissolved in 30mL of anhydrous acetone, the mixture is moved to an ice water bath and cooled to 0 ℃, then 10mL of an acetone solution of n-hexadecylamine (2.44g, 10.09mmol) is slowly added dropwise, the mixture is stirred for half an hour and then moved to the room temperature, and the mixture is stirred overnight. Monitoring the reaction by thin-layer chromatography, stopping stirring when the reaction is finished, and filtering the solvent to obtain a crude product; the crude product was suspended in acetone (100ml), stirred at room temperature for 1 hour, and the solid compound was collected by filtration, and this procedure was repeated three times; the resulting filter cake was then suspended in anhydrous ethanol (100ml), stirred at room temperature for 1 hour, filtered to collect the solid compound, and the process was repeated three times; and finally, collecting the obtained solid compound, and drying in vacuum to obtain a white solid pure product.

The yield of the crude product is 80 percent, but after pulping and purifying by using a large amount of solvents, the yield is only about 30 percent, and the specific yield cannot be obtained. The single-component gelator is synthesized by the following route:

the result of the detection

The pyromellitic dianhydride gelator gel is compounded with n-hexylamine, n-octylamine, n-decylamine, n-dodecylamine, n-tetradecylamine and n-hexadecylamine respectively in different proportions, as shown in table 1, the gel may not form effective gel in benzene, but the gel can form stable gel in toluene under the specific compounding proportion with some fatty amines, and the corresponding minimum gel concentration is measured in experiments. The lowest gel concentration in diesel fuel after the gel factor was formulated with n-hexadecylamine was already less than 1, and these data indicate that diesel fuel is a good gel solvent for this gelator. In liquid paraffin, stable gels are formed whether or not compounded. No uniform transparent gel was formed from any of tables 2, 3, 4, 5, and 6, and although some gels could form, there was a partial or small amount of undissolved gelator at the bottom of the gel, so that the lowest gel concentration could not be actually measured, and the specific gel phenomena are listed in the tables. FIG. 7 shows that the lowest gel concentration of the single-configuration gelator is much lower when tested again by further formulating the single-configuration gelator with n-hexadecylamine at different mass ratios.

TABLE 1 gelation phenomenon of pyromellitic dianhydride gelator compounded with n-hexadecylamine

P is deposition; g is gel, the data units shown in the table are in wt%.

TABLE 2 gelation of pyromellitic dianhydride gelation factor in combination with n-hexylamine

P is deposition; g is gel, the data units shown in the table are in wt%.

TABLE 3 gelation of pyromellitic dianhydride gelators compounded with n-octylamine

P is deposition; g is gel, the data units shown in the table are in wt%.

TABLE 4 gelation phenomenon of pyromellitic dianhydride gelator compounded with n-decylamine

P is deposition; g is gel, the data units shown in the table are in wt%.

TABLE 5 gelation of pyromellitic dianhydride gelation factor complexed with n-dodecylamine

P is deposition; g is gel, the data units shown in the table are in wt%.

TABLE 6 gelation phenomenon of pyromellitic dianhydride gelator compounded with n-tetradecylamine

P is deposition; g is gel, the data units shown in the table are wt% of the monoconfigured pyromellitic acid of Table 7

Gelation phenomenon of compounding formic acid dianhydride gelator and n-hexadecylamine

The data shown in the table are in wt%.

FIG. 1 shows a thermal scan of a paraffin gel, which shows that these gels can be left for a long time at room temperature and that the two-component gel is more stable. FIG. 2 shows rheological measurements of varying vibrational stress and vibrational frequency, respectively, and mechanical strength studies were performed to show that the gels undergo gel-to-sol conversion and that the formulated gels have greater mechanical strength than single component gels. The diffraction peak of the compounded gel is much lower than that of the single-component gel which is not compounded under the same concentration through an X-ray powder diffraction spectrum shown in figure 3, which indicates that the self-contained form of the compounded gel is more disordered and complicated and the periodic diffraction peak is lower. The self-contained form of the gel is not completely changed by adding the ethanol, and the ethanol has strong damage to the single-component gel, so that the diffraction peak of the single-component gel is rapidly weakened, which shows that the single-component gel has lower effect on an anti-proton solvent, and the double-component gel has better tolerance to the ethanol. FIG. 4 shows nuclear magnetic hydrogen spectra indicating the structural presence of gel factors of the type pyromellitic dianhydride. As can be seen in the two graphs a and b of FIG. 5, when the amine component is added to form a two-component gel, the fibers become significantly thicker and the linear fibers extend for a longer length, which also indicates that the gel structure is more stable than the single-component gel result. After the ethanol is added, the gel structure is changed into a sheet stacking structure from a line winding structure on a micron-scale level, the self-assembly form of the gel is changed due to the fact that the hydrogen bonds among molecules of the gel are damaged by the addition of the alcohol solvent, but the gel is not changed into a true solution due to the fact that pi-pi stacking is used as a main driving force of the gel.

A novel aromatic acid organic small molecule gel factor is synthesized by one-step reaction at low cost, and the gel factor can be used for gelatinizing a plurality of base oils 500SN, 150BS, PAO10 and PAO40, so that the gel factor can be used as an ideal additive of a gel lubricant. The gel is a soft substance, self-assembles into a three-dimensional network-shaped aggregate structure through non-covalent bond actions such as hydrogen bond, pi-pi accumulation, van der waals action and the like, the aggregate fixes some specific solvents through capillary and solvophobic actions, and macroscopically shows a solid form. The gel can keep a solid state at a certain temperature and stress, and once the gel exceeds the limit of the gel, the gel is transformed into sol through phase change. Provides a solution for designing lubricants for special purposes.

Structure of gelator:

gels can be formed in the following base oils: PAO10, PAO30, 150BS, 500 SN. And provides minimum gel concentration data.

	500SN	150BS	PAO10	PAO40
					MGC(wt％)	1.54	1.12	2.09	2.41

Friction and wear test: the frictional wear performance of the organic micromolecule gel lubricant is evaluated by adopting an SRV-IV micro-vibration frictional wear tester produced by Germany optimol grease company, and is compared with the corresponding base oil 150 BS.

Example 2

The application of the pyromellitic acid amide micromolecule gel in the aspect of gel lubricants is that the mass percentage content of the pyromellitic acid amide micromolecule gel is 1%; the mass percentage of the base oil 500SN is 99%; the heating and dissolving temperature is as follows: the heating time was 5 minutes at 120 ℃.

Example 3

The application of the pyromellitic acid amide micromolecule gel in the aspect of gel lubricants is that the mass percentage content of the pyromellitic acid amide micromolecule gel is 99%; the mass percentage of the base oil 500SN is 1%; the heating and dissolving temperature is as follows: the heating time was 10 minutes at 100 ℃.

Example 4

The application of the pyromellitic acid amide micromolecule gel in the aspect of gel lubricants is that the mass percentage content of the pyromellitic acid amide micromolecule gel is 95%; the base oil 150BS accounts for 5% by mass; the heating and dissolving temperature is as follows: the heating time was 10 minutes at 100 ℃.

Experiment one:

loads of 100N, 200N, 300N, 400N, 500N, 600N and 700N are selected, the temperature is 25 ℃, the frequency is 25Hz, the amplitude is 2mm, the experimental time of different loads is respectively 5min, the experimental upper test ball is an AISI 52100 steel ball, and the lower test sample is an AISI 52100 steel block. FIG. 1 shows COF curves for 2% gel lubricant and a blank 150BS base oil at 100N-700N. When the load reaches 200N, the COF of 150BS reaches 0.34 and then drops to 0.28. Furthermore, the COF of the 2% gel was stable at 0.17 throughout the rubbing process, even under the severe condition of 700N loading, the COF was stable at 0.17 with very smooth fluctuations, and it is evident that 150BS failed at 700N. Experiments show that under different loads, the friction reducing and wear resisting performance of the organic micromolecule gel lubricant is superior to that of base oil, and the organic micromolecule gel lubricant has lower friction coefficient and excellent wear resisting performance.

Experiment two:

the test ball is an AISI 52100 steel ball, and the lower sample is an AISI 52100 steel block, wherein the frequencies are 5Hz, 10Hz, 15Hz, 20Hz, 25Hz, 30Hz, 35Hz, 40Hz and 45Hz, the temperature is 25 ℃, the load is 300N, the amplitude is 2mm, the test time of different frequencies is respectively 5 min. As is evident from fig. 2, the COF of the 150BS gel lubricant remained at 0.28, and was still stable at 0.17, with very smooth fluctuations. Experiments show that the friction reducing and wear resisting performance of the organic micromolecule gel lubricant is superior to that of base oil under different frequencies, and the organic micromolecule gel lubricant has lower friction coefficient and excellent wear resisting performance.

Experiment three:

the temperature is 25 ℃, 45 ℃, 65 ℃, 85 ℃, 105 ℃, 125 ℃, the frequency is 25Hz, the load is 300N, the amplitude is 2mm, the experimental time is 5min respectively at different temperatures, the experimental upper test ball is an AISI 52100 steel ball, and the lower test sample is an AISI 52100 steel block. The gel lubricant has satisfactory friction reducing performance at 120 ℃. The lubricating failure experiment of the blank oil 150BS shows that the friction reducing and wear resisting performance of the organic micromolecule gel lubricant is superior to that of the base oil at different temperatures, and the organic micromolecule gel lubricant has lower friction coefficient and excellent wear resisting performance.

Experiment four:

in order to simulate the stability and the lubricating performance of the gel lubricant under normal working conditions, a four-ball wear tester MRS-10A is adopted to carry out a long-grinding test. The frictional wear performance of the inventive organic small molecule gel lubricant was evaluated and compared to the corresponding base oil 150 BS.

Load 400N, temperature room temperature (25-30 ℃), speed 1450rpm, experimental time 30 minutes. The experimental test ball is an AISI 52100 steel ball with the diameter of 12.7mm and the hardness of 59-61 HRC. Experiments show that the friction coefficient of the gel lubricant is always smaller than 150BS of the base oil, the change range of the friction coefficient is small, and a temperature-time curve shows that the heat generated by a friction pair is smaller than 150BS of the base oil in the test of the gel lubricant. The experimental data comprehensively show that the friction-reducing and wear-resisting properties of the organic micromolecule gel lubricant are superior to those of base oil, and the organic micromolecule gel lubricant has lower friction coefficient and excellent wear-resisting properties.

In order to study the thermal stability of the gel lubricant, differential scanning calorimetry spectrograms of the gel lubricant at different concentrations were respectively carried out, and the temperatures of the endothermic peak and the exothermic peak of 150BS and 500SN are obviously increased along with the increase of the concentrations. The temperature is above 60 ℃, and the thermal stability is good, so that the use of most appliances under normal working conditions can be met.

Scanning electron microscope tests of base oil 150BS and gel lubrication under 50 times and 500 times respectively are carried out, scanning electron microscopes show that the grinding mark of the base oil 150BS is large in area and deep in depth, a large number of small steel blocks are peeled off from the friction surface to form pits, and abrasive wear occurs on the surface of a steel plate due to lubrication failure of the base oil 150 BS. However, the gel lubricant wear scar area becomes smaller and the depth becomes shallower. The friction surface of the steel disc had only slight scuffing, indicating better lubrication of the gel lubricant.

It should be understood that the detailed description and specific examples, while indicating the embodiments of the invention, are given by way of illustration only, not limitation, and various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. As long as the use requirements are met, the method is within the protection scope of the invention.