Gel factor and preparation method thereof, gel lubricant and preparation method and application thereof

Abstract

The invention relates to the technical field of gel lubricants, in particular to a gelator, a preparation method of the gelator, a gel lubricant and a preparation method of the gel lubricant. The gelator is constructed on the basis of the synergistic effect of dynamic disulfide bonds and multiple hydrogen bonds, dynamic covalent bonds with low bond energy are introduced, and the reversible fracture and recombination characteristics of the disulfide bonds are combined, so that gel can exert the reversible effect of the dynamic covalent bonds after being damaged by external force to achieve rapid self-assembly, and the self-assembly performance of the gel is improved. And the gel lubricant is endowed with good working condition adaptability. Besides, the gelator has wide universality, can show excellent tribological performance in different types of base oil without adding other additives, and shows good anti-attrition and anti-wear effects under the conditions of variable temperature, variable frequency, variable load and long-term abrasion.

Description

Technical Field

[0001] The present invention relates to the technical field of gel lubricants, and particularly relates to a gel factor, a preparation method thereof, a gel lubricant and a preparation method thereof. Background Art

[0002] Friction and wear are common problems in mechanical equipment, which not only consume a large amount of energy, but also seriously affect the stability and service life of the equipment. In recent years, supramolecular gel lubricants, as a new type of lubricating material, have received increasing attention due to their good rheological properties and self-healing ability. Gel lubricants can confine the base oil in the three-dimensional network formed by their self-assembly, thus avoiding the creep and leakage of the base oil. In addition, gel lubricants have shear thinning and creep recovery characteristics, which reduce the viscous resistance during machine startup and can return to the gel state after the machine stops running. However, due to the relatively small bond energy of non-covalent bonds, the mechanical strength of supramolecular gel lubricants prepared based on non-covalent bonds is weak. Compared with dynamic covalent bonds, the speed of "breaking" and "binding" of non-covalent bonds is relatively slow, and the self-adaptability of the prepared supramolecular gel is relatively weak, which limits its application in actual working conditions. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a gel factor, a preparation method thereof, a gel lubricant and a preparation method thereof. The gel factor of the present invention can endow the gel lubricant with good working condition self-adaptability.

[0004] To achieve the above invention purpose, the present invention provides the following technical solutions:

[0005] The present invention provides a gel factor having the structure shown in Formula 1:

[0006]

[0007] In Formula 1, x:y:z = 1:1:(2 - 3).

[0008] The present invention also provides a preparation method of the gel factor described in the above technical solution, including the following steps:

[0009] Mix hydroxyethyl methacrylate, lipoic acid and a first organic solvent, and then add 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDH-HCl) and a first catalyst to carry out a first addition reaction to obtain a disulfide monomer;

[0010] Mix 2-amino-4-hydroxy-6-methylpyrimidine and hexamethylene diisocyanate to carry out a second addition reaction to obtain 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4(1H)-pyrimidinone (UPY-NCO);

[0011] Mix the UPY-NCO, hydroxyethyl methacrylate and the second organic solvent, add a second catalyst, and carry out a third addition reaction to obtain a multiple hydrogen bond monomer;

[0012] Mix the disulfide bond monomer, the multiple hydrogen bond monomer, the octadecyl 2-methylacrylate monomer, an initiator and a third organic solvent, and carry out a polymerization reaction to obtain the gel factor.

[0013] Preferably, the molar ratio of hydroxyethyl methacrylate to lipoic acid is 1:(1.1 - 1.2);

[0014] The molar ratio of lipoic acid to the first catalyst is 1:(0.1 - 0.3);

[0015] The molar ratio of lipoic acid to EDH-HCl is 1:(1.0 - 1.1);

[0016] The first organic solvent includes dichloromethane and / or chloroform;

[0017] The first catalyst includes 4-dimethylaminopyridine;

[0018] The temperature of the first addition reaction is 20 - 30 °C, and the time is 12 - 24 h.

[0019] Preferably, the molar ratio of 2-amino-4-hydroxy-6-methylpyrimidine to hexamethylene diisocyanate is 1:(3 - 10);

[0020] The temperature of the second addition reaction is 90 - 120 °C, and the time is 12 - 24 h.

[0021] Preferably, the molar ratio of UPY-NCO to hydroxyethyl methacrylate is 1:(1.1 - 1.2);

[0022] The mass of the second catalyst accounts for 1% - 3% of the total mass of UPY-NCO and hydroxyethyl methacrylate;

[0023] The second organic solvent includes chloroform;

[0024] The second catalyst includes dibutyltin dilaurate;

[0025] The temperature of the third addition reaction is 20 - 30 °C, and the time is 24 - 48 h.

[0026] Preferably, the molar ratio of the disulfide bond monomer, the multiple hydrogen bond monomer and the octadecyl 2-methylacrylate monomer is 1:1:(2 - 3);

[0027] The mass of the initiator accounts for 1-2% of the total mass of the disulfide monomer, the multiple hydrogen bond monomer, and the octadecyl methacrylate monomer;

[0028] The initiator includes azobisisobutyronitrile;

[0029] The third organic solvent includes N,N-dimethylformamide and / or dimethyl sulfoxide;

[0030] The temperature of the polymerization reaction is 75-85 °C, and the time is 12-24 h.

[0031] The present invention provides a gel lubricant, which includes 90-97% of base oil and 3-10% of gel factor by mass percentage;

[0032] The gel factor is the gel factor described in the above technical solution or the gel factor prepared by the preparation method described in the above technical solution.

[0033] Preferably, the base oil includes mineral oil and / or polyalphaolefin.

[0034] The present invention also provides a preparation method of the gel lubricant described in the above technical solution, including the following steps:

[0035] Mix the gel factor and the base oil to obtain the gel lubricant.

[0036] The present invention also provides the application of the gel lubricant described in the above technical solution or the gel lubricant prepared by the preparation method described in the above technical solution in the lubrication of mechanical components.

[0037] The present invention provides a gel factor with the structure shown in Formula 1:

[0038]

[0039] In Formula 1, x:y:z = 1:1:(2-3).

[0040] The gel factor of the present invention is constructed based on the synergistic effect of dynamic disulfide bonds and multiple hydrogen bonds. By introducing low bond energy dynamic covalent bonds and combining the reversible cleavage and recombination characteristics of disulfide bonds, the gel can play the reversible role of dynamic covalent bonds to achieve rapid self-assembly after being damaged by external forces, endowing the gel lubricant with good working condition self-adaptability. In addition, the gel factor has wide universality and can exhibit excellent tribological properties without adding other additives in different types of base oils, and shows good anti-friction and anti-wear effects under conditions of variable temperature, variable frequency, variable load, and long-term grinding.

[0041] The present invention also provides a gel lubricant, which comprises 90-97% of base oil and 3-10% of gel factor by mass percentage; the gel factor is the gel factor described in the above technical solution or the gel factor prepared by the preparation method described in the above technical solution. Applying the gel lubricant of the present invention to the mechanical component lubrication system can effectively reduce friction and wear, extend the service life of the equipment, and significantly improve the protection performance of mechanical parts, having broad industrial application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the preparation process of the gel factor described in the present invention;

[0043] Figure 2 It is a nuclear magnetic characterization diagram of the gel factor described in Example 1;

[0044] Figure 3 It is a rheological property curve diagram of the gel lubricant A4 described in Example 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The present invention provides a gel factor having the structure shown in Formula 1:

[0046]

[0047] In Formula 1, x:y:z = 1:1:(2-3).

[0048] In the present invention, x:y:z is preferably 1:1:2. In the present invention, x, y, and z can be understood as the number of repeating units.

[0049] In the present invention, the molecular weight of the gel factor is preferably 10,000-30,000 g / mol.

[0050] As Figure 1 shown in the preparation process, the present invention also provides a preparation method of the gel factor described in the above technical solution, comprising the following steps:

[0051] After mixing hydroxyethyl methacrylate, lipoic acid and a first organic solvent, adding 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and a first catalyst, and carrying out a first addition reaction to obtain a disulfide monomer;

[0052] Mixing 2-amino-4-hydroxy-6-methylpyrimidine and hexamethylene diisocyanate, and carrying out a second addition reaction to obtain 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4(1H)-pyrimidinone;

[0053] Mix the 2-(6-isocyanatohexylcarbamoylamino)-6-methyl-4(1H)-pyrimidinone, 2-hydroxyethyl methacrylate and a second organic solvent, add a second catalyst, and carry out a third addition reaction to obtain a multiple hydrogen bond monomer;

[0054] Mix the disulfide bond monomer, the multiple hydrogen bond monomer, the octadecyl 2-methylacrylate monomer, an initiator and a third organic solvent, and carry out a polymerization reaction to obtain the gelator.

[0055] In the present invention, unless otherwise specified, all the preparation raw materials are commercially available products well-known to those skilled in the art.

[0056] In the present invention, 2-hydroxyethyl methacrylate, lipoic acid and a first organic solvent are mixed, and then 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and a first catalyst are added, and a first addition reaction is carried out to obtain a disulfide bond monomer.

[0057] In the present invention, the molar ratio of the 2-hydroxyethyl methacrylate to the lipoic acid is preferably 1:(1.1 - 1.2); the molar ratio of the lipoic acid to the first catalyst is preferably 1:(0.1 - 0.3); the molar ratio of the lipoic acid to the EDH-HCl is preferably 1:(1.0 - 1.1). In the examples of the present invention, the molar ratio of the 2-hydroxyethyl methacrylate to the lipoic acid is 1:1.1; the molar ratio of the lipoic acid to the first catalyst is preferably 1:2; the molar ratio of the lipoic acid to the EDH-HCl is preferably 1:1.1.

[0058] In the present invention, the first organic solvent preferably includes dichloromethane and / or chloroform, more preferably dichloromethane; when the first organic solvent is dichloromethane and chloroform, the present invention has no special limitation on the ratio of the dichloromethane to the chloroform, and they can be mixed in any ratio. In the examples of the present invention, the first organic solvent can be dichloromethane.

[0059] In the present invention, the first catalyst is preferably 4-dimethylaminopyridine (DMAP);

[0060] In the present invention, the mixing is preferably carried out under ice bath and stirring conditions. The present invention has no special limitation on the stirring rate, and it can be carried out according to the process well-known in the art. The stirring time is preferably 1 h. In the present invention, mixing under stirring conditions can ensure that the materials are fully dispersed and contacted.

[0061] In the present invention, the mixing order is preferably to add 2-hydroxyethyl methacrylate and lipoic acid to the first organic solvent.

[0062] The present invention has no special limitation on the addition manner of the EDH-HCl and the first catalyst, and any manner well-known to those skilled in the art can be adopted.

[0063] In the present invention, the temperature of the first addition reaction is preferably 20 to 30 °C (room temperature), the time is preferably 12 to 24 h, and more preferably 24 h. In the examples of the present invention, the temperature of the first addition reaction can be room temperature and the time can be 24 h.

[0064] After the first addition reaction is completed, the present invention preferably further includes extraction, drying, filtration and rotary evaporation carried out in sequence. In the present invention, the extraction is preferably carried out by using hydrochloric acid with a concentration of 1 mol / L, saturated sodium bicarbonate solution and saturated brine in sequence; the present invention has no special limitation on the extraction process, and any process well-known to those skilled in the art can be adopted. In the present invention, the drying is preferably carried out by using magnesium sulfate, and the object of drying is the organic phase obtained after extraction. The present invention has no special limitation on the filtration and rotary evaporation processes, and any processes well-known to those skilled in the art can be adopted.

[0065] The present invention mixes 2-amino-4-hydroxy-6-methylpyrimidine and hexamethylene diisocyanate to carry out a second addition reaction to obtain 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4(1H)-pyrimidinone (UPY-NCO).

[0066] In the present invention, the molar ratio of 2-amino-4-hydroxy-6-methylpyrimidine to hexamethylene diisocyanate is preferably 1:(3 to 10), and more preferably 1:(4 to 7). In the examples of the present invention, the molar ratio of 2-amino-4-hydroxy-6-methylpyrimidine to hexamethylene diisocyanate can be 1:7.

[0067] The present invention has no special limitation on the mixing process, and any process well-known to those skilled in the art can be adopted.

[0068] In the present invention, the second addition reaction is preferably carried out in a protective atmosphere, and the protective atmosphere is preferably a nitrogen atmosphere. In the present invention, the temperature of the second addition reaction is preferably 90 to 120 °C, and more preferably 100 to 110 °C; the time is preferably 12 to 24 h, and more preferably 24 h. In the present invention, the second addition reaction is preferably carried out under stirring conditions, and the present invention has no special limitation on the stirring speed, and any speed well-known to those skilled in the art can be adopted.

[0069] After the completion of the second addition reaction, the present invention preferably further includes cooling, washing, filtering, and drying in sequence; the present invention has no special limitation on the cooling process, and a process well-known to those skilled in the art can be used. In the present invention, the washing is preferably carried out by adding an excessive amount of n-hexane at room temperature, and the present invention has no special limitation on the washing process, and a process well-known to those skilled in the art can ensure the removal of residual hexamethylene diisocyanate (HDI). The present invention has no special limitation on the filtering and drying processes, and a process well-known to those skilled in the art can be used.

[0070] After obtaining the disulfide monomer and UPY-NCO, the present invention mixes the UPY-NCO, 2-hydroxyethyl methacrylate, and a second organic solvent, adds a second catalyst, and conducts a third addition reaction to obtain a multiple hydrogen bond monomer.

[0071] In the present invention, the second organic solvent is preferably chloroform.

[0072] In the present invention, the molar ratio of the UPY-NCO to 2-hydroxyethyl methacrylate is preferably 1:(1.1 - 1.2). In the examples of the present invention, the molar ratio of the UPY-NCO to 2-hydroxyethyl methacrylate can be 1:1.1.

[0073] In the present invention, the mixing sequence is preferably adding the UPY-NCO and 2-hydroxyethyl methacrylate to the second organic solvent, and the present invention has no special limitation on the adding process, and a process well-known to those skilled in the art can be used.

[0074] In the present invention, the second catalyst includes dibutyltin dilaurate; the mass of the second catalyst preferably accounts for 1% - 3% of the total mass of the UPY-NCO and 2-hydroxyethyl methacrylate. In the examples of the present invention, the mass of the second catalyst preferably accounts for 1% of the total mass of the UPY-NCO and 2-hydroxyethyl methacrylate.

[0075] In the present invention, the addition method of the second catalyst is preferably dropwise addition, and the present invention has no special limitation on the dropwise addition process, and a process well-known to those skilled in the art can be used.

[0076] In the present invention, the temperature of the third addition reaction is preferably 20 - 30 °C, and the time is preferably 24 - 48 h; the third addition reaction is preferably carried out under stirring conditions, and the present invention has no special limitation on the stirring process, and a process well-known to those skilled in the art can be used. In the examples of the present invention, the third addition reaction can be stirring at room temperature for 24 h.

[0077] After the completion of the third addition reaction, the present invention preferably further includes rotary evaporation, washing, and drying. The present invention does not have any special limitations on the process of the rotary evaporation, and it can be carried out by a process well-known to those skilled in the art and ensure that the second organic solvent can be removed. In the present invention, the washing is preferably carried out with an excessive amount of acetone. The present invention does not have any special limitations on the process of the washing, and it can be carried out by a process well-known to those skilled in the art. The present invention does not have any special limitations on the process of the drying, and it can be carried out by a process well-known to those skilled in the art.

[0078] After obtaining the multiple hydrogen bond monomer and the disulfide bond monomer, the present invention mixes the disulfide bond monomer, the multiple hydrogen bond monomer, the octadecyl 2-methylacrylate monomer, the initiator, and the third organic solvent, and carries out a polymerization reaction to obtain the gel factor.

[0079] In the present invention, the initiator is preferably azobisisobutyronitrile.

[0080] In the present invention, the third organic solvent preferably includes N,N-dimethylformamide and / or dimethyl sulfoxide, and more preferably includes N,N-dimethylformamide; when the third organic solvent is N,N-dimethylformamide and dimethyl sulfoxide, the present invention does not have any special limitations on the ratio of N,N-dimethylformamide and dimethyl sulfoxide, and they can be mixed in any ratio.

[0081] In the present invention, the molar ratio of the disulfide bond monomer, the multiple hydrogen bond monomer, and the octadecyl 2-methylacrylate monomer is preferably 1:1:(2-3); the mass of the initiator preferably accounts for 1-2% of the total mass of the disulfide bond monomer, the multiple hydrogen bond monomer, and the octadecyl 2-methylacrylate monomer. In the examples of the present invention, the molar ratio of the disulfide bond monomer, the multiple hydrogen bond monomer, and the octadecyl 2-methylacrylate monomer can be 1:1:2; the mass of the initiator can account for 1% of the total mass of the disulfide bond monomer, the multiple hydrogen bond monomer, and the octadecyl 2-methylacrylate monomer.

[0082] The present invention does not have any special limitations on the process of the mixing, and it can be carried out by a process well-known to those skilled in the art.

[0083] After the completion of the mixing, the present invention preferably further includes removing oxygen, and the method of removing oxygen is preferably passing nitrogen. In the examples of the present invention, the method of removing oxygen can be passing nitrogen for 30 minutes.

[0084] In the present invention, the temperature of the polymerization reaction is preferably 75 to 85 °C, and the time is preferably 12 to 24 h. In the present invention, the temperature of the polymerization reaction is preferably achieved by an oil bath. In the examples of the present invention, the temperature of the polymerization reaction can be 85 °C and the time can be 24 h. In the present invention, the polymerization reaction is preferably carried out under stirring conditions, and the present invention has no special limitation on the stirring process, and a process well-known to those skilled in the art can be used.

[0085] After the polymerization reaction is completed, the present invention preferably further includes precipitation, recrystallization, and vacuum drying in sequence. In the present invention, the precipitation method is preferably to drop the mixed solution obtained after the completion of the polymerization reaction into cold absolute ethanol until precipitation is complete. The present invention has no special limitation on the recrystallization and vacuum drying processes, and a process well-known to those skilled in the art can be used.

[0086] The present invention provides a gel lubricant, which comprises 90 to 97% of a base oil and 3 to 10% of a gel factor by mass percentage;

[0087] The gel factor is the gel factor described in the above technical solution or the gel factor prepared by the preparation method described in the above technical solution.

[0088] In the present invention, the base oil preferably includes mineral oil and / or polyalphaolefin; the model of the polyalphaolefin is preferably PAO10. When the base oil is two or more of the above specific selections, the present invention has no special limitation on the ratio of the above specific substances, and they can be mixed in any ratio.

[0089] The present invention also provides a preparation method of the gel lubricant described in the above technical solution, comprising the following steps:

[0090] Mix the gel factor and the base oil to obtain the gel lubricant.

[0091] In the present invention, the temperature of the mixing is preferably 110 to 150 °C, more preferably 120 °C. In the present invention, the mixing is preferably carried out under stirring conditions, and the present invention has no special limitation on the stirring process, and a process well-known to those skilled in the art can be used.

[0092] After the mixing is completed, the present invention preferably further includes cooling, and the present invention has no special limitation on the cooling process, and a process well-known to those skilled in the art can be used.

[0093] The present invention also provides an application of the gel lubricant described in the above technical solution or the gel lubricant prepared by the preparation method described in the above technical solution in the lubrication of mechanical components. In the present invention, the mechanical component is preferably bearing steel. The present invention does not have any special limitation on the method of the application, and the method well-known to those skilled in the art can be used.

[0094] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0095] Example 1

[0096] As Figure 1 shown in the preparation process:

[0097] In 200 mL of dichloromethane, 0.02 mol of 2-hydroxyethyl methacrylate and 0.022 mol of lipoic acid are added, and the mixture is stirred for 1 h under an ice bath condition. Then, 0.022 mol of EDH-HCl and 0.004 mol of 4-dimethylaminopyridine (DMAP) are added, and after stirring at room temperature for 24 h, the obtained reaction mixture is extracted successively with 1 mol / L HCl, saturated NaHCO3, and saturated brine, and the organic layer is dried with magnesium sulfate, filtered, and rotary evaporated to obtain a disulfide monomer.

[0098] 0.02 mol of 2-amino-4-hydroxy-6-methylpyrimidine (UPY) and 0.14 mol of hexamethylene diisocyanate (HDI) are mixed, and after stirring at 100 °C under a nitrogen atmosphere for 24 h, it is cooled to room temperature and washed with an excessive amount of n-hexane to remove the residual HDI, and then subjected to filtration separation and drying in sequence to obtain a white powder (UPY-NCO) as the product;

[0099] 0.01 mol of the UPY-NCO powder and 0.011 mol of 2-hydroxyethyl methacrylate are added to 200 mL of chloroform. After adding 0.02 g of dibutyltin dilaurate dropwise, the mixture is stirred and reacted at room temperature for 24 h, then the solvent chloroform is rotary evaporated, and the product is rinsed with an excessive amount of acetone and dried to obtain a multiple hydrogen bond monomer;

[0100] 0.01 mol of multi-hydrogen bond monomer, 0.01 mol of disulfide bond monomer, 0.02 mol of octadecyl methacrylate monomer and 0.15 g of azobisisobutyronitrile were added to 50 mL of N,N-dimethylformamide in a round-bottom flask and mixed. Nitrogen was introduced for 30 minutes to remove oxygen. A water condenser was set in an 85 °C oil bath. After reacting for 24 h under magnetic stirring, the resulting mixed solution was dropped into cold absolute ethanol until precipitation was complete. Recrystallization and vacuum drying were carried out successively to obtain a gelator (x:y:z = 1:1:2).

[0101] Figure 2 is the NMR characterization diagram of the said gelator. It can be seen from Figure 2 that the gelator with the structure shown in Formula 1 was successfully synthesized in the present invention.

[0102] Example 2

[0103] Preparation of gel lubricant:

[0104] 0.03 g of the gelator described in Example 1 was added to 0.97 g of base oil PAO10 and stirred at 120 °C until completely dissolved to obtain a gel lubricant (denoted as A1).

[0105] Example 3

[0106] Preparation of gel lubricant:

[0107] 0.05 g of the gelator described in Example 1 was added to 0.95 g of base oil PAO10 and stirred at 120 °C until completely dissolved to obtain a gel lubricant (denoted as A2).

[0108] Example 4

[0109] Preparation of gel lubricant:

[0110] 0.07 g of the gelator described in Example 1 was added to 0.93 g of base oil PAO10 and stirred at 120 °C until completely dissolved to obtain a gel lubricant (denoted as A3).

[0111] Example 5

[0112] Preparation of gel lubricant:

[0113] 0.09 g of the gelator described in Example 1 was added to 0.91 g of base oil PAO10 and stirred at 120 °C until completely dissolved to obtain a gel lubricant (denoted as A4).

[0114] Comparative Example 1

[0115] Base oil PAO10 was used as a control solution.

[0116] Test Example

[0117] Coefficient of friction test: The SRV-IV micro-vibration friction and wear tester produced by Optimol Oelwerke GmbH in Germany was used to evaluate the friction and wear properties of the gel lubricants (A1 to A4) described in Examples 2 to 5 and the base oil PAO10 described in Comparative Example 1. The test conditions were as follows: load 200 N, temperature 25 °C, frequency 25 Hz, amplitude 1 mm, test time 30 min, the upper test ball was a steel ball with a diameter of 10 mm, and the lower specimen was a GCr steel block;

[0118] The above coefficient of friction is shown in Table 1:

[0119] Table 1 Average coefficient of friction of the gel lubricants described in Comparative Example 1 and Examples 2 to 5

[0120] Example Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Average coefficient of friction 0.1396 0.1187 0.1185 0.1181 0.1174

[0121] As can be seen from Table 1, compared with the base oil PAO10, the coefficient of friction of A1 to A4 described in Examples 2 to 5 is significantly reduced, and with the increase of the content of the gel factor prepared in Example 1, the average coefficient of friction of the gel lubricants A1 to A4 gradually decreases. The gel lubricant A4 has the lowest average coefficient of friction;

[0122] Rheological property test: The yield point of the gel lubricant A4 described in Example 5 was subjected to a stress sweep, and the stress sweep test was not immediately stopped. Subsequently, a stress reduction sweep test was immediately carried out to evaluate the self-recovery ability of the gel lubricant A4;

[0123] Wherein Figure 3 is the rheological property curve of the gel lubricant A4. As can be seen from Figure 3 , during the stress reduction process of the gel lubricant A4, the gel network damaged at a higher stress cannot be rebuilt, resulting in a continuous decrease in the storage modulus G'. After the stress is reduced to a lower value, a sol-gel phase transition occurs. This is proved by the fact that the storage modulus G' is greater than the loss modulus G'' again. Therefore, the gel lubricant has good recovery performance.

[0124] The above is only the preferred embodiment of the present invention and does not impose any form of limitation on the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A gel factor, characterized in that: It has the structure shown in formula 1: In the formula 1, x:y:z=1:1:(2-3).

2. The method for preparing the gel factor according to claim 1, characterized in that: The following steps are involved: After mixing hydroxyethyl methacrylate, thioctic acid and a first organic solvent, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and a first catalyst are added to perform a first addition reaction to obtain a disulfide bond monomer; 2-amino-4-hydroxy-6-methylpyrimidine and hexamethylene diisocyanate are mixed and subjected to a second addition reaction to obtain 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4(1H)-pyrimidinone; The 2(6-isocyanatehexylaminocarbonylamino)-6-methyl-4(1H)-pyrimidinone, hydroxyethyl methacrylate and a second organic solvent are mixed, a second catalyst is added, and a third addition reaction is performed to obtain a multiple hydrogen bond monomer; The disulfide bond monomer, the multiple hydrogen bond monomer, the 2-octadecyl methacrylate monomer, the initiator and the third organic solvent are mixed and polymerized to obtain the gel factor.

3. The preparation method according to claim 2, characterized in that: The molar ratio of the hydroxyethyl methacrylate to lipoic acid is 1:(1.1-1.2); The molar ratio of the lipoic acid to the first catalyst is 1:(0.1-0.3); The molar ratio of lipoic acid to 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride is 1:(1.0-1.1); The first organic solvent includes dichloromethane and / or chloroform; The first catalyst includes 4-dimethylaminopyridine; The temperature of the first addition reaction is 20-30° C. and the time is 12-24 hours.

4. The preparation method according to claim 2, characterized in that: The molar ratio of the 2-amino-4-hydroxy-6-methylpyrimidine to hexamethylene diisocyanate is 1:(3-10); The temperature of the second addition reaction is 90-120° C., and the time is 12-24 hours.

5. The preparation method according to claim 2, characterized in that: The molar ratio of the 2(6-isocyanatehexylaminocarbonylamino)-6-methyl-4(1H)-pyrimidinone to hydroxyethyl methacrylate is 1:(1.1-1.2); The mass of the second catalyst accounts for 1% to 3% of the total mass of the 2(6-isocyanatehexylaminocarbonylamino)-6-methyl-4(1H)-pyrimidinone and hydroxyethyl methacrylate; The second organic solvent includes chloroform; The second catalyst includes dibutyltin dilaurate; The temperature of the third addition reaction is 20-30° C. and the time is 24-48 hours.

6. The preparation method according to claim 2, characterized in that: The molar ratio of the disulfide bond monomer, the multiple hydrogen bond monomer and the 2-octadecyl methacrylate monomer is 1:1:(2-3); The mass of the initiator accounts for 1 to 2% of the total mass of the disulfide bond monomer, the multiple hydrogen bond monomer and the 2-octadecyl methacrylate monomer; The initiator includes azobisisobutyronitrile; The third organic solvent includes N,N-dimethylformamide and / or dimethyl sulfoxide; The polymerization reaction temperature is 75-85° C. and the reaction time is 12-24 hours.

7. A gel lubricant, characterized in that: According to the percentage by mass, it includes 90-97% of base oil and 3-10% of gel factor; The gel factor is the gel factor according to claim 1 or the gel factor prepared by the preparation method according to any one of claims 2 to 6.

8. The lubricating gel according to claim 7, characterized in that: The base oil includes mineral oil and / or poly alpha-olefin.

9. The method for preparing the jelly lubricant according to claim 7 or 8, characterized in that: The following steps are involved: The gel factor and the base oil are mixed to obtain the gel lubricant.

10. Use of the gel lubricant according to claim 7 or the gel lubricant prepared by the preparation method according to claim 8 or 9 in lubricating mechanical parts.

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