CN117210264B - Modified lubricating grease with low friction coefficient and application - Google Patents
Modified lubricating grease with low friction coefficient and application Download PDFInfo
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- CN117210264B CN117210264B CN202311185353.9A CN202311185353A CN117210264B CN 117210264 B CN117210264 B CN 117210264B CN 202311185353 A CN202311185353 A CN 202311185353A CN 117210264 B CN117210264 B CN 117210264B
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- 239000004519 grease Substances 0.000 title claims abstract description 44
- 230000001050 lubricating effect Effects 0.000 title abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 13
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 13
- 239000002199 base oil Substances 0.000 claims abstract description 13
- 239000013556 antirust agent Substances 0.000 claims abstract description 7
- 239000000314 lubricant Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000003831 antifriction material Substances 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 6
- YJKHMSPWWGBKTN-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)F YJKHMSPWWGBKTN-UHFFFAOYSA-N 0.000 claims description 5
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 5
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 5
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 5
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 claims description 4
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 3
- 239000010696 ester oil Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 3
- 239000008158 vegetable oil Substances 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 2
- 239000008116 calcium stearate Substances 0.000 claims description 2
- 235000013539 calcium stearate Nutrition 0.000 claims description 2
- 239000003999 initiator Substances 0.000 claims description 2
- 235000019359 magnesium stearate Nutrition 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- 230000035515 penetration Effects 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 6
- 239000007921 spray Substances 0.000 abstract description 3
- 239000002562 thickening agent Substances 0.000 description 8
- 239000003112 inhibitor Substances 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 239000000654 additive Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 235000012424 soybean oil Nutrition 0.000 description 2
- 239000003549 soybean oil Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- QDCPNGVVOWVKJG-VAWYXSNFSA-N 2-[(e)-dodec-1-enyl]butanedioic acid Chemical group CCCCCCCCCC\C=C\C(C(O)=O)CC(O)=O QDCPNGVVOWVKJG-VAWYXSNFSA-N 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- DTIWZILWCUSUSG-UHFFFAOYSA-N C(=CCCCCCCCCCC)C(C(=O)O)CC(=O)O.NCCC=1N(CCN1)C=CCCCCCCCCCCCCCCC Chemical compound C(=CCCCCCCCCCC)C(C(=O)O)CC(=O)O.NCCC=1N(CCN1)C=CCCCCCCCCCCCCCCC DTIWZILWCUSUSG-UHFFFAOYSA-N 0.000 description 1
- SIFQXSULZADKSK-UHFFFAOYSA-L C(N)([S-])=S.C(CCC)[Mo+2]CCCC.C(N)([S-])=S Chemical compound C(N)([S-])=S.C(CCC)[Mo+2]CCCC.C(N)([S-])=S SIFQXSULZADKSK-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 125000003354 benzotriazolyl group Chemical group N1N=NC2=C1C=CC=C2* 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- CJFLBOQMPJCWLR-UHFFFAOYSA-N bis(6-methylheptyl) hexanedioate Chemical compound CC(C)CCCCCOC(=O)CCCCC(=O)OCCCCCC(C)C CJFLBOQMPJCWLR-UHFFFAOYSA-N 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- XBBHFQNIEJGGIG-UHFFFAOYSA-N dibutyllead Chemical compound CCCC[Pb]CCCC XBBHFQNIEJGGIG-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- -1 dodecenyl butanediamine Chemical compound 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Lubricants (AREA)
Abstract
The application provides a modified lubricating grease with a low friction coefficient and application thereof. The modified lubricating grease with the low friction coefficient comprises the following components in parts by mass: 60-90 parts of base oil, 10-25 parts of modified fluorosilicone acrylic resin, 0.05-0.5 part of antirust agent, 0.5-2 parts of solid lubricant and 1-2 parts of antifriction agent. The modified lubricating grease prepared by the application has high dropping point and extreme pressure performance, low abrasive spot diameter and water spray resistance under the condition of keeping low friction coefficient and proper cone penetration, so that the modified lubricating grease has excellent high temperature resistance, water resistance and extreme pressure abrasion resistance.
Description
Technical Field
The invention belongs to the technical field of lubrication, and particularly relates to modified lubricating grease with a low friction coefficient and application thereof.
Background
Grease commonly known as butter or tallow is a stable solid or semisolid product formed by dispersing a thickener in a base oil. The lubricating grease can be used for friction parts of mechanical parts, so that friction of contact surfaces of the mechanical parts is reduced, and the contact surfaces are protected and sealed; the coating can also be used for metal surfaces, and a protective layer is formed on the metal surfaces to prevent the metal surfaces from rusting and corroding. With the development of industry, the requirements of various fields on the performance of lubricating grease are continuously improved.
The lubricating grease mainly comprises a thickening agent, base oil and an additive. The base oil is a dispersion medium in a grease dispersion system, has a great influence on the performance of grease, and generally adopts petroleum lubricating oil with medium viscosity and/or high viscosity as the base oil; the thickener is an important component of the lubricating grease, is dispersed in the base oil and forms a structural framework of the lubricating grease, so that the base oil is adsorbed and fixed in the structural framework, and the water resistance and the heat resistance of the lubricating grease are mainly determined by the thickener, wherein the thickener comprises a soap-based thickener and a non-soap-based thickener; additives are added according to the performance requirements of the grease, such as: in order to improve the resistance of lubricating grease to loss and lubrication, graphite, molybdenum disulfide, carbon black and the like are often added as fillers, but the friction coefficient of the lubricating grease prepared by using thickening agents, base oil and additives in the prior art is relatively high, and the heat stability, the water resistance and the wear resistance are poor.
Aiming at the problems of the existing lubricating grease, how to provide the lubricating grease with low friction coefficient, good stability, water resistance and wear resistance is a problem to be solved in the invention.
Disclosure of Invention
The present invention is directed to a modified grease having a low coefficient of friction and applications thereof to solve the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: in one aspect, the invention provides a modified grease with a low friction coefficient, comprising the following components in parts by mass: 60-90 parts of base oil, 10-25 parts of modified fluorosilicone acrylic resin, 0.05-0.5 part of antirust agent, 0.5-2 parts of solid lubricant and 1-2 parts of antifriction agent.
As a further improvement, the preparation method of the modified fluorosilicone acrylic resin comprises the following steps:
(1) Adding an organic solvent and an initiator into a reaction kettle, regulating the temperature of the reaction kettle to 60-100 ℃, and then adding butyl acrylate, methyl methacrylate, sodium p-styrenesulfonate and hydroxyethyl acrylate into the reaction kettle for constant-temperature reaction for 2-4 hours;
(2) Continuously adding vinyl triethoxysilane into the system in the step (1), wherein the dripping speed is 0.5-1 drop/s, and continuously carrying out constant-temperature reaction for 1-3h after the dripping is finished;
(3) Continuously adding the dodecafluoroheptyl methacrylate into the system in the step (2), and then carrying out constant-temperature reaction for 1-3h;
(4) Continuously adding tetraethoxysilane into the system in the step (3), cooling to 50-70 ℃, then dropwise adding water at the speed of 0.5-2 drops/3 s, adjusting the pH of the system to 4-6, continuously reacting for 2-5h after the water is dropwise added, distilling under reduced pressure, and cooling to room temperature to obtain the modified fluorosilicone acrylic resin.
As a further improvement, the mass ratio of the butyl acrylate to the methyl methacrylate to the sodium p-styrenesulfonate to the hydroxyethyl acrylate is 2-4:3-5:2.5-4:2-4.
As a further improvement, the mass ratio of the butyl acrylate to the vinyl triethoxysilane to the dodecafluoroheptyl methacrylate to the tetraethoxysilane is 1:0.2-0.4:1.5-3:1-2.
As a further improvement, the solid lubricant is a mixture of stearate, water-soluble dialkyl dithiophosphate and molybdenum disulfide in a mass ratio of 1:2-5:0.3-0.6.
As a further improvement, at least one of the stearate, the water-soluble dialkyldithiophosphate.
As a further improvement, the stearate is at least one of zinc stearate, magnesium stearate and calcium stearate.
As a further improvement, the water-soluble dialkyldithiophosphate is zinc dialkyldithiophosphate.
As a further improvement, the base oil is at least one of ester oil and vegetable oil.
As a further improvement, the ester oil is preferably diisooctyl adipate and the vegetable oil is preferably epoxidized soybean oil.
As a further improvement, the antifriction agent is a dithiodialkylamino salt.
As a further improvement, the dithiodialkylamino salt is at least one of dibutyl lead dithiocarbamate and dibutyl molybdenum dithiocarbamate.
As a further improvement, the rust inhibitor is at least one of an organic carboxylic acid type rust inhibitor, an organic amine type rust inhibitor, sulfur and nitrogen heterocycle type rust inhibitor.
As a further improvement, the organic carboxylic acid rust inhibitor is preferably dodecenyl succinic acid.
As a further improvement, the organic amine rust inhibitor is preferably at least one of dodecenyl butanediamine and 2-aminoethyl heptadecenyl imidazoline dodecenyl butanedioic acid.
As a further improvement, the nitrogen heterocyclic rust inhibitor is preferably benzotriazole.
On the other hand, the invention also provides application of the modified lubricating grease with low friction coefficient in lubrication of steel and steel friction pairs.
Compared with the prior art, the application has the beneficial effects that: the modified lubricating grease prepared by the application has high dropping point and extreme pressure performance, low abrasive spot diameter and water spray resistance under the condition of keeping low friction coefficient and proper cone penetration, so that the modified lubricating grease has excellent high temperature resistance, water resistance and extreme pressure abrasion resistance.
Detailed Description
The invention will be described below in connection with specific embodiments. The following examples are illustrative of the present invention and are not intended to limit the present invention. Other combinations and various modifications within the spirit of the invention may be made without departing from the spirit or scope of the invention.
In the following examples, except for the modified fluorosilicone acrylic resin, the remaining compound monomers and related reagents used were commercially available, wherein epoxidized soybean oil was purchased from Ji nan Xin super New Material Co., ltd, under the trade designation CR00254; the fluororesin was purchased from Dongguan city Heng Plastic raw materials Co., ltd and was assigned the brand name of AP-230.
The preparation method of the modified fluorosilicone acrylic resin comprises the following steps:
(1) 250 parts by mass of ethylene glycol dimethyl ether and 1 part by mass of benzoyl peroxide are added into a reaction kettle, the temperature of the reaction kettle is regulated to 80 ℃, and then 5 parts by mass of butyl acrylate, 8 parts by mass of methyl methacrylate, 7 parts by mass of sodium p-styrenesulfonate and 6 parts by mass of hydroxyethyl acrylate are added into the reaction kettle for constant-temperature reaction for 3 hours;
(2) Continuously adding 1.5 parts by mass of vinyl triethoxysilane into the system in the step (1), wherein the dropping speed is 0.5 drop/s, and continuously carrying out constant-temperature reaction for 2 hours after the dropping is finished;
(3) Continuously adding 10 parts by mass of dodecafluoroheptyl methacrylate into the system in the step (2), and then reacting for 2 hours at constant temperature;
(4) And (3) continuously adding 6 parts by mass of tetraethoxysilane into the system in the step (3), cooling to 60 ℃, then dropwise adding water at a speed of 1 drop/3 s, adjusting the pH of the system to 4, continuously reacting for 4 hours after the dropwise adding of water (the total water amount is 20 mL), distilling under reduced pressure, and cooling to room temperature to obtain the modified fluorosilicone acrylic resin.
The preparation of the modified lubricating grease 1-6 comprises the following steps:
Adding the base oil and the modified fluorosilicone acrylic resin in the parts by weight required by the formula into a reaction kettle, regulating the temperature to 135 ℃, uniformly stirring, stopping heating, and continuously stirring until the temperature is reduced to 120 ℃ to obtain the modified lubricant with low friction coefficient (wherein the modified fluorosilicone acrylic resin is changed into the fluororesin when the modified lubricating grease 6 is prepared).
The components and the contents of the components used for the modified greases 1 to 6 are shown in tables 1 to 2:
TABLE 1
TABLE 2
The test method is as follows:
Cone penetration, 0.1mm: GB/T269, wherein the taper-in degree is in accordance with the requirements when the taper-in degree is 200-300;
water shower resistance (38 ℃,1 h),%: SH/T0109;
Abrasion resistance, mm: a long-wear test was performed on the modified greases prepared in comparative example 1 and examples 1 to 6 by using an MMW-1 type vertical universal frictional wear tester manufactured by Jinan Shuan Yao test instruments Co., ltd., for 30 minutes, with a load of 392N and a rotational speed of 1450r/min. According to SH/T0189-92 (392N), the plaque diameter (WSD) of the test ball is measured by a reading microscope (precision.+ -. 0.01), and the average value of the three plaque diameters is taken as the experimental result value. The selected steel ball is a second grade G16 standard steel ball (national standard GB/T308-2002) produced by Huixian Guangming steel ball mill, the diameter is 12.7mm, the hardness HRC is 60, and the weight is 2.5Kg;
Four ball test (maximum no bite load, normal temperature, 1500 rpm), N: GB/T3142-2019;
dropping point, c: GB/T3498;
Coefficient of friction (line contact, 300N,80 ℃ C.). SH/T0721-2002.
The test results are shown in Table 3, and are specifically as follows:
TABLE 3 Table 3
As can be seen from the comparison of example 1 and comparative example 1, the modified grease prepared by using the modified fluorosilicone acrylic resin provided by the application not only has proper penetration (grease consistency), but also obviously improves the dropping point (good high temperature resistance) and extreme pressure property (pressure resistance) of the modified grease, reduces the abrasive spot diameter (good abrasion resistance) and friction coefficient of the modified grease, and the prepared modified grease also has excellent water resistance;
As can be seen from comparison of examples 1 and examples 5 to 6, when the ratio of stearate, water-soluble dialkyl dithiophosphate and molybdenum disulfide in the solid lubricant is in a proper range, the compression resistance and wear resistance and water resistance of the modified lubricating grease are improved and the friction coefficient is reduced under the condition of keeping a higher dropping point and proper cone penetration;
From a comparison of examples 1-3, it is seen that the modified greases prepared using the components and amounts of each component of the present application not only maintain high drop points and proper penetration, but also have high resistance to compression and abrasion as well as water resistance, as well as a low coefficient of friction;
In conclusion, the modified lubricating grease prepared by the application has high dropping point and extreme pressure performance and low mill mark diameter and water spray resistance under the condition of keeping low friction coefficient and proper cone penetration, so that the modified lubricating grease has excellent high temperature resistance, water resistance and extreme pressure abrasion resistance.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement it, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A modified grease having a low coefficient of friction, characterized by: comprises the following components in parts by mass: 60-90 parts of base oil, 10-25 parts of modified fluorosilicone acrylic resin, 0.05-0.5 part of antirust agent, 0.5-2 parts of solid lubricant and 1-2 parts of antifriction agent;
The preparation method of the modified fluorosilicone acrylic resin comprises the following steps:
(1) Adding an organic solvent and an initiator into a reaction kettle, regulating the temperature of the reaction kettle to 60-100 ℃, and then adding butyl acrylate, methyl methacrylate, sodium p-styrenesulfonate and hydroxyethyl acrylate into the reaction kettle for constant-temperature reaction for 2-4 hours;
(2) Continuously adding vinyl triethoxysilane into the system in the step (1), wherein the dripping speed is 0.5-1 drop/s, and continuously carrying out constant-temperature reaction for 1-3h after the dripping is finished;
(3) Continuously adding the dodecafluoroheptyl methacrylate into the system in the step (2), and then carrying out constant-temperature reaction for 1-3h;
(4) Continuously adding tetraethoxysilane into the system in the step (3), cooling to 50-70 ℃, then dropwise adding water at the speed of 0.5-2 drops/3 s, adjusting the pH of the system to 4-6, continuously reacting for 2-5h after the water is dropwise added, distilling under reduced pressure, and cooling to room temperature to obtain the modified fluorosilicone acrylic resin;
the solid lubricant is a mixture of stearate, water-soluble dialkyl dithiophosphate and molybdenum disulfide with the mass ratio of 1:2-5:0.3-0.6.
2. A modified grease having a low coefficient of friction according to claim 1, characterized in that: the mass ratio of the butyl acrylate to the methyl methacrylate to the sodium p-styrenesulfonate to the hydroxyethyl acrylate is 2-4:3-5:2.5-4:2-4.
3. A modified grease having a low coefficient of friction according to claim 2, characterized in that: the mass ratio of the butyl acrylate to the vinyl triethoxysilane to the dodecafluoroheptyl methacrylate to the tetraethoxysilane is 1:0.2-0.4:1.5-3:1-2.
4. A modified grease having a low coefficient of friction according to claim 1, characterized in that: the stearate is at least one of zinc stearate, magnesium stearate and calcium stearate.
5. A modified grease having a low coefficient of friction according to claim 1, characterized in that: the base oil is at least one of ester oil and vegetable oil.
6. A modified grease having a low coefficient of friction according to claim 1, characterized in that: the antifriction agent is a dithiodialkylamino salt.
7. A modified grease having a low coefficient of friction according to claim 4, wherein: the antirust agent is at least one of organic carboxylic acid antirust agent, organic amine antirust agent, sulfur and nitrogen heterocyclic antirust agent.
8. Use of a modified grease having a low coefficient of friction according to any of claims 1-7 in the lubrication of steel, steel friction pairs.
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