CN116814313A - Polytetrafluoroethylene nano lubricating additive and preparation method and application thereof - Google Patents
Polytetrafluoroethylene nano lubricating additive and preparation method and application thereof Download PDFInfo
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- CN116814313A CN116814313A CN202311090783.2A CN202311090783A CN116814313A CN 116814313 A CN116814313 A CN 116814313A CN 202311090783 A CN202311090783 A CN 202311090783A CN 116814313 A CN116814313 A CN 116814313A
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- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 109
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 109
- -1 Polytetrafluoroethylene Polymers 0.000 title claims abstract description 108
- 239000000654 additive Substances 0.000 title claims abstract description 91
- 230000000996 additive effect Effects 0.000 title claims abstract description 85
- 230000001050 lubricating effect Effects 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000314 lubricant Substances 0.000 claims abstract description 44
- 239000010687 lubricating oil Substances 0.000 claims abstract description 24
- 239000010413 mother solution Substances 0.000 claims abstract description 9
- 239000010705 motor oil Substances 0.000 claims description 51
- 238000003756 stirring Methods 0.000 claims description 50
- 239000003921 oil Substances 0.000 claims description 36
- 239000010689 synthetic lubricating oil Substances 0.000 claims description 23
- 239000012452 mother liquor Substances 0.000 claims description 18
- 238000005461 lubrication Methods 0.000 claims description 16
- 238000011056 performance test Methods 0.000 claims description 14
- 230000001804 emulsifying effect Effects 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000004945 emulsification Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 13
- 239000002245 particle Substances 0.000 description 7
- 229920013639 polyalphaolefin Polymers 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000002199 base oil Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000003116 impacting effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000000024 high-resolution transmission electron micrograph Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of lubricating oil, and particularly relates to a polytetrafluoroethylene nano lubricating additive and a preparation method and application thereof. According to the invention, the nano polytetrafluoroethylene mother solution is introduced, and polytetrafluoroethylene and lubricating oil are sufficiently sheared, dispersed and impacted through high-speed emulsification, so that the polytetrafluoroethylene and the lubricating oil are sufficiently mixed, and the polytetrafluoroethylene nano lubricating additive with excellent antifriction and antiwear properties is obtained. The invention also provides a lubricant comprising the polytetrafluoroethylene nano-lubricating additive of the invention and identifies the optimal concentration of use of the polytetrafluoroethylene nano-lubricating additive of the invention in engine lubricating oil for achieving antifriction and antiwear properties.
Description
Technical Field
The invention belongs to the technical field of lubricating oil, and particularly relates to a polytetrafluoroethylene nano lubricating additive and a preparation method and application thereof.
Background
The energy loss during operation of the engine mainly includes low thermal efficiency, friction loss, and the like. The 70% friction occurs in the cold starting state of the engine, and along with the occurrence of friction, certain scratches or pits are formed on the inner wall of the cylinder, and the phenomena of high oil consumption, insufficient power and the like can occur after long-term use, so that higher requirements are provided for engine lubricating oil (namely engine oil) and lubricating additives.
Polytetrafluoroethylene (PTFE) has a novel structure and excellent physical and chemical properties, and when used as a lubricating additive for lubricating oil, can exist in the form of nanoparticles or nanomembranes on the surface of a friction pair, and exhibits excellent lubricating properties and antifriction and antiwear properties. However, the characteristics of polytetrafluoroethylene particles such as poor particle size and dispersion stability limit the application thereof.
Disclosure of Invention
The invention aims to solve the problems of poor dispersion stability of polytetrafluoroethylene nano particles in lubricating oil, complex preparation process and long time consumption.
The invention also aims to solve the problem of abrasion of the inner wall of the cylinder caused by dry friction under cold start of the engine, and provide more excellent antifriction and antiwear performance for the engine lubricating oil so as to achieve the effect of long-acting protection for the engine.
In order to solve the problems, the nano polytetrafluoroethylene mother solution is introduced, and polytetrafluoroethylene and lubricating oil are sufficiently sheared, dispersed and impacted through high-speed emulsification, so that the polytetrafluoroethylene and the lubricating oil are sufficiently mixed, and the organic polytetrafluoroethylene nano lubricating additive with excellent antifriction and antiwear properties is obtained. The nanometer lubricating additive can repair scratches and pits in the cylinder in the running process of the engine, and can form a chemical protective film through chemical action, and the protective film can be reserved on the inner wall of the engine for a long time, so that the dry friction state of the engine during cold start is avoided.
Specifically, the invention provides a preparation method of a polytetrafluoroethylene nano lubricating additive, which comprises the following steps:
(1) Adding synthetic lubricating oil and polytetrafluoroethylene mother liquor with a certain proportion into a stirring kettle, wherein the mass ratio of the synthetic lubricating oil to the polytetrafluoroethylene mother liquor is 100:1-4,
(2) Stirring under the protection of inert gas to uniformly mix the synthetic lubricating oil and polytetrafluoroethylene mother liquor,
(3) Emulsifying the mixture of the lubricating oil and the polytetrafluoroethylene mother solution at 55 ℃ by using a high-speed emulsifying machine for at least 4 hours to obtain the polytetrafluoroethylene nano lubricating additive.
Further, a synthetic lubricating oil as used herein is a synthetic lubricating oil formulated with PAO as a base oil. Synthetic lubricating oils formulated with PAO as a base oil are well known to those skilled in the art.
Further, in the step (1), the mass ratio of the synthetic lubricating oil (prepared by using PAO as base oil) to the polytetrafluoroethylene mother solution is 100:3.
Further, the inert gas is selected from nitrogen.
Further, in the step (2), the stirring is performed at 25 to 55 ℃ and 200 to 800 rpm. Preferably, the stirring is carried out at 45 ℃. Preferably, the stirring is performed at 600 rpm.
Further, in the step (2), the stirring is performed for 5 to 10 minutes.
The invention also provides a polytetrafluoroethylene nano-lubricating additive prepared by the preparation method.
The present invention also provides a lubricant comprising a polytetrafluoroethylene nano-lubricating additive as described herein.
In particular, the present invention provides a lubricant comprising an engine oil and a polytetrafluoroethylene nanolubrication additive, wherein the polytetrafluoroethylene nanolubrication additive is prepared by a method as described above,
wherein the engine oil is selected from the group consisting of total synthetic engine oils, semi-synthetic engine oils and mineral engine oils,
wherein when the engine oil is a fully synthetic engine oil, the mass ratio of engine oil to polytetrafluoroethylene nano-lubrication additive in the lubricant is 20-50:1, and the lubricant exhibits a reduced coefficient of friction compared to engine oil alone at a frequency of 35-45 Hz in a friction performance test of an SRV fretting wear tester,
wherein when the engine oil is a semisynthetic oil, the mass ratio of oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 50:1 and the lubricant exhibits a reduced coefficient of friction as compared to engine oil alone at a frequency of 25-35 Hz in an SRV fretting wear tester friction performance test, or the mass ratio of oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 20-30:1 and the lubricant exhibits a reduced coefficient of friction as compared to engine oil alone at a frequency of 35-45 Hz in an SRV fretting wear tester friction performance test,
wherein when the engine oil is mineral engine oil, the mass ratio of engine oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 10:1 and the lubricant exhibits a reduced friction coefficient compared to engine oil alone at a frequency of 25-45 Hz in an SRV fretting wear tester friction performance test, or the mass ratio of engine oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 50:1 and the lubricant exhibits a reduced friction coefficient compared to engine oil alone at a frequency of 25-35 Hz in an SRV fretting wear tester friction performance test, or the mass ratio of engine oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 20-30:1 and the lubricant exhibits a reduced friction coefficient compared to engine oil alone at a frequency of 35-45 Hz in an SRV fretting wear tester friction performance test.
Still further, the present invention provides a lubricant comprising an engine oil and a polytetrafluoroethylene nanolubrication additive, wherein the polytetrafluoroethylene nanolubrication additive is prepared by a method as described above,
wherein the engine oil is selected from the group consisting of total synthetic engine oils, semi-synthetic engine oils and mineral engine oils,
wherein the mass ratio of the engine oil to the polytetrafluoroethylene nano-lubrication additive in the lubricant is 20-30:1, and the lubricant exhibits a reduced friction coefficient compared to engine oil alone at a frequency of 35-45 Hz in a friction performance test of an SRV fretting wear tester.
The invention has the beneficial effects that:
the invention prepares the organic polytetrafluoroethylene nano lubricating additive with excellent antifriction and antiwear properties through a series of conditions such as specific proportion, stirring speed, temperature, time length, inert gas protection and the like. The polytetrafluoroethylene nano particles are distributed in a pellet shape in engine lubricating oil and are uniformly distributed, the average particle size is 5-20 nm, and the distribution is relatively dispersed and uniform. The excellent dispersion stability and smaller nanometer particle size lay a good structural foundation for antifriction and antiwear performance of engine lubricating oil.
The nano lubricating additive can be quickly adsorbed on the surface of a friction pair of an engine, scratches and depressions in the cylinder can be repaired, so that a smooth and compact protective film can be formed on the metal surface in the running process of the engine, further friction between the friction pairs is prevented, the antifriction and antiwear effects are achieved, the protective film can be reserved on the inner wall of the engine cylinder for a long time, the antifriction and antiwear effects can be achieved when the engine is started in a cold mode, and carbon deposition is reduced to a certain extent.
The invention also researches the optimal use concentration of the nano lubricating additive in engine lubricating oil, and discovers that the nano lubricating additive has different applicable concentrations in different kinds of engine lubricating oil.
In addition, the preparation method disclosed by the invention is simple in preparation process and short in time consumption, and has a prospect of wide industrial application.
Drawings
Fig. 1 shows a high resolution transmission electron micrograph (50000 x) of a polytetrafluoroethylene nano-lubricating additive.
Fig. 2 shows a high resolution transmission electron micrograph (150000 x) of the polytetrafluoroethylene nano-lubricating additive.
Figure 3 shows the particle size distribution profile of the polytetrafluoroethylene nano-lubricating additive.
Fig. 4 shows the friction coefficient profile at 25 Hz for an oil sample containing polytetrafluoroethylene nano-lubrication additive.
Fig. 5 shows the friction coefficient curve for an oil sample containing polytetrafluoroethylene nano-lubrication additive at 35 Hz.
Fig. 6 shows the friction coefficient curve at 45 Hz for an oil sample containing polytetrafluoroethylene nano-lubrication additive.
Figure 7 shows the average coefficient of friction at 25 Hz for an oil sample containing polytetrafluoroethylene nano-lubrication additive.
Figure 8 shows the average coefficient of friction at 35 Hz for an oil sample containing polytetrafluoroethylene nano-lubrication additive.
Figure 9 shows the average coefficient of friction at 45 Hz for an oil sample containing polytetrafluoroethylene nano-lubrication additive.
Fig. 10 shows the friction coefficient profile at 25 Hz for a second oil sample containing a polytetrafluoroethylene nano-lubricating additive.
Fig. 11 shows the friction coefficient profile at 35 Hz for a second oil sample containing a polytetrafluoroethylene nano-lubricating additive.
Fig. 12 shows the friction coefficient curve at 45 Hz for oil sample two containing polytetrafluoroethylene nano-lubrication additive.
Figure 13 shows the average coefficient of friction at 25 Hz for oil sample two containing polytetrafluoroethylene nano-lubrication additive.
Figure 14 shows the average coefficient of friction at 35 Hz for oil sample two containing polytetrafluoroethylene nano-lubrication additive.
Figure 15 shows the average coefficient of friction at 45 Hz for oil sample two containing polytetrafluoroethylene nano-lubrication additive.
Fig. 16 shows the coefficient of friction curve at 25 Hz for a third oil sample containing a polytetrafluoroethylene nano-lubricating additive.
Fig. 17 shows the friction coefficient curve at 35 Hz for a third oil sample containing a polytetrafluoroethylene nano-lubricating additive.
Fig. 18 shows the friction coefficient curve at 45 Hz for a third oil sample containing polytetrafluoroethylene nano-lubrication additive.
Figure 19 shows the average coefficient of friction at 25 Hz for a third oil sample containing polytetrafluoroethylene nano-lubrication additive.
Figure 20 shows the average coefficient of friction at 35 Hz for a third oil sample containing a polytetrafluoroethylene nano-lubricating additive.
Figure 21 shows the average coefficient of friction at 45 Hz for a third oil sample containing polytetrafluoroethylene nano-lubrication additive.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Preparation example 1
The embodiment provides a preparation method of a polytetrafluoroethylene nano-lubricating additive, which comprises the following steps:
and (3) pumping synthetic lubricating oil (prepared by taking PAO as base oil) with a certain proportion into a stirring kettle by using a diaphragm pump, and simultaneously injecting polytetrafluoroethylene mother liquor with a certain proportion into the stirring kettle, wherein the proportion of the synthetic lubricating oil added into the stirring kettle to the polytetrafluoroethylene mother liquor is 100:3. After the injection of the lubricating oil and the polytetrafluoroethylene mother solution is completed, introducing nitrogen into the stirring kettle, and repeatedly operating the stirring kettle by introducing air for 7 times until the air in the stirring kettle is exhausted (the reason that inert gas is used for protection is to isolate moisture in the air), then starting the stirring kettle for stirring for 8 minutes, setting the temperature in the stirring kettle to 45 ℃, and setting the rotating speed of the stirring kettle to 600 rpm during working so as to uniformly mix the synthetic lubricating oil and the polytetrafluoroethylene mother solution. After stirring for a certain time, opening a high-speed emulsifying machine, heating to 55 ℃ at the same time, emulsifying the organic nano lubricating additive in the stirring kettle by using the high-speed emulsifying machine for 4 hours, and fully shearing, dispersing and impacting the organic nano lubricating additive through emulsification so as to fully mix polytetrafluoroethylene mother liquor with synthetic lubricating oil. Finally, the friction-reducing and wear-resistant polytetrafluoroethylene nano-lubricating additive is obtained.
Preparation example 2
The embodiment provides a preparation method of a polytetrafluoroethylene nano-lubricating additive, which comprises the following steps:
and (3) pumping synthetic lubricating oil (prepared by taking PAO as base oil) with a certain proportion into a stirring kettle by using a diaphragm pump, and simultaneously injecting polytetrafluoroethylene mother liquor with a certain proportion into the stirring kettle, wherein the proportion of the synthetic lubricating oil added into the stirring kettle to the polytetrafluoroethylene mother liquor is 100:1. After the injection of the lubricating oil and the polytetrafluoroethylene mother solution is completed, introducing nitrogen into the stirring kettle, and repeatedly operating the stirring kettle for 5 times by introducing air until the air in the stirring kettle is exhausted (the reason that inert gas is used for protection is to isolate moisture in the air), then starting the stirring kettle for stirring for 10 minutes, setting the temperature in the stirring kettle to 25 ℃, and setting the rotating speed of the stirring kettle to 800 rpm during working so as to uniformly mix the synthetic lubricating oil and the polytetrafluoroethylene mother solution. After stirring for a certain time, opening a high-speed emulsifying machine, heating to 55 ℃ at the same time, emulsifying the organic nano lubricating additive in the stirring kettle by using the high-speed emulsifying machine for 5 hours, and fully shearing, dispersing and impacting the organic nano lubricating additive through emulsification so as to fully mix polytetrafluoroethylene mother liquor with synthetic lubricating oil. Finally, the friction-reducing and wear-resistant polytetrafluoroethylene nano-lubricating additive is obtained.
Preparation example 3
The embodiment provides a preparation method of a polytetrafluoroethylene nano-lubricating additive, which comprises the following steps:
and (3) pumping synthetic lubricating oil (prepared by taking PAO as base oil) with a certain proportion into a stirring kettle by using a diaphragm pump, and simultaneously injecting polytetrafluoroethylene mother liquor with a certain proportion into the stirring kettle, wherein the proportion of the synthetic lubricating oil added into the stirring kettle to the polytetrafluoroethylene mother liquor is 100:4. After the injection of the lubricating oil and the polytetrafluoroethylene mother liquor is completed, introducing nitrogen into the stirring kettle, and repeatedly operating the stirring kettle for 6 times by introducing air until the air in the stirring kettle is exhausted (the reason of protecting the stirring kettle by using inert gas is to isolate moisture in the air), then starting the stirring kettle to stir for 5 minutes, setting the temperature in the stirring kettle to 55 ℃, and setting the rotating speed of the stirring kettle to 200 rpm during the working process, so that the synthetic lubricating oil and the polytetrafluoroethylene mother liquor are uniformly mixed. After stirring for a certain time, opening a high-speed emulsifying machine, heating to 55 ℃ at the same time, emulsifying the organic nano lubricating additive in the stirring kettle by using the high-speed emulsifying machine for 8 hours, and fully shearing, dispersing and impacting the organic nano lubricating additive through emulsification so as to fully mix polytetrafluoroethylene mother liquor with synthetic lubricating oil. Finally, the friction-reducing and wear-resistant polytetrafluoroethylene nano-lubricating additive is obtained.
The morphology of the nanolubrication additives prepared in preparation examples 1-3 was characterized using a high resolution transmission electron microscope (HR-TEM). The results are shown in figures 1-3, which show that the nano lubricating additive is distributed in a pellet shape in the engine lubricating oil and is uniformly distributed, the average particle size is 5-20 nm, and the distribution is relatively dispersed and uniform. The excellent dispersion stability and smaller nanometer particle size lay a good structural foundation for antifriction and antiwear performance of engine lubricating oil.
Application example 1
The oil sample I (one of the commercially available total synthetic engine oils mainly comprising poly alpha olefin) and the polytetrafluoroethylene nano-lubricating additive prepared in preparation example 1 are uniformly mixed in a mass ratio of 50:1, 30:1 and 20:1 to obtain the lubricant containing the polytetrafluoroethylene nano-lubricating additive.
The friction performance of the lubricant is tested by an SRV fretting friction wear testing machine, and the testing conditions are as follows: temperature 75 ℃, load 75N, stroke 1mm, frequency 25 Hz (approximately equal to engine speed 1500 rpm), 35 Hz (approximately equal to engine speed 2100 rpm), 45 Hz (approximately equal to engine speed 2700 rpm), long mill 30min.
The results are shown in fig. 4-9, which demonstrate that the addition of the organic polytetrafluoroethylene nano-additive has substantially no effect on the tribological properties of the oil sample one under low frequency (25 Hz) test conditions. With the increase of the frequency, the friction coefficient of any concentration with the mass ratio lower than 10:1 is smaller than that of a pure oil sample, and the friction coefficient is most obviously reduced by 9-11% under the conditions of 45 Hz test, wherein the mass ratio is 50:1, 30:1 and 20:1.
Application example 2
Oil-like bis (one of commercially available semisynthetic engine oils) was homogeneously mixed with the polytetrafluoroethylene nanolubrication additive prepared in preparation example 1 in a mass ratio of 50:1, 30:1, 20:1 to obtain a lubricant comprising polytetrafluoroethylene nanolubrication additive.
The friction performance of the lubricant is tested by an SRV fretting friction wear testing machine, and the testing conditions are as follows: temperature 75 ℃, load 75N, stroke 1mm, frequency 25 Hz (approximately equal to engine speed 1500 rpm), 35 Hz (approximately equal to engine speed 2100 rpm), 45 Hz (approximately equal to engine speed 2700 rpm), long mill 30min.
The results are shown in fig. 10-15, which demonstrate that the friction coefficient is better than that of the second oil sample when the mass ratio of the second oil sample to the organic polytetrafluoroethylene nano-additive is 50:1 and 30:1 under the test condition of 25 Hz. Under the test condition of 35 Hz, when the mass ratio of the lubricating additive is less than or equal to 20:1, the friction coefficient is better than that of the oil sample II. Under the test condition of high rotating speed (45 Hz), the friction coefficient is smaller than that of the oil sample II when the mass ratio is 30:1 and 20:1.
Application example 3
Oil-like tris (one of commercially available mineral motor oils) was homogeneously mixed with the polytetrafluoroethylene nanolubrication additive prepared in preparation example 1 in a mass ratio of 50:1, 30:1, 20:1, to obtain a lubricant comprising the polytetrafluoroethylene nanolubrication additive.
The friction performance of the lubricant is tested by an SRV fretting friction wear testing machine, and the testing conditions are as follows: temperature 75 ℃, load 75N, stroke 1mm, frequency 25 Hz (approximately equal to engine speed 1500 rpm), 35 Hz (approximately equal to engine speed 2100 rpm), 45 Hz (approximately equal to engine speed 2700 rpm), long mill 30min.
The results are shown in fig. 16-21, which demonstrate that at low rotational speeds (25 Hz), the oil-like three to organic polytetrafluoroethylene nano-additive mass ratios of 50:1, 30:1, 10:1 all exhibit excellent tribological properties, especially at a mass ratio of 10:1, the coefficient of friction is reduced by about 15%. As the frequency (engine speed 2100 rpm) increases (35 Hz), the coefficient of friction for either mass ratio is less than the coefficient of friction for the third oil sample, which decreases by about 10%. The friction coefficient is smaller than that of the oil sample three under the conditions of the mass ratio of 30:1, 20:1 and 10:1 at the high frequency (45 Hz), and the friction coefficient is reduced by about 10%.
Basic physical and chemical performance test:
the basic physicochemical properties of the organic polytetrafluoroethylene nano-additives in three types of lubricating oils were also tested for the lubricants prepared in application examples 1-3, and the results are shown in table 1 below.
Table 1: basic physical and chemical properties of organic polytetrafluoroethylene nano additive in three types of lubricating oil
As shown in Table 1, physical and chemical property tests show that the addition of the nano additive has no influence on the compatibility of physical and chemical properties of three types of oil products.
As shown in the SRV fretting friction wear test results, the oil product added with the nano additive shows excellent antifriction and antiwear performances, and the nano lubricating additive can be fast adsorbed on the surface of the friction pair and can repair the pits on the metal surface, so that a smooth and compact protective film can be formed on the metal surface in the running process of the engine, further friction between the friction pair is prevented, further antifriction and antiwear effects are achieved, the protective film can be reserved on the inner wall of an engine cylinder for a long time, the antifriction and antiwear effects can be also achieved when the engine is started in a cold mode, and carbon deposition is reduced to a certain extent.
It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the invention, but are provided for a more thorough understanding of the present invention. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present invention described in the specification; further, modifications and variations of the present invention may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this invention as defined in the appended claims.
Claims (9)
1. A lubricant comprising an engine oil and a polytetrafluoroethylene nanolubrication additive, wherein the polytetrafluoroethylene nanolubrication additive is prepared by a process comprising the steps of:
(1) Adding synthetic lubricating oil and polytetrafluoroethylene mother liquor into a stirring kettle, wherein the mass ratio of the synthetic lubricating oil to the polytetrafluoroethylene mother liquor is 100:1-4,
(2) Stirring under the protection of inert gas to uniformly mix the synthetic lubricating oil and polytetrafluoroethylene mother liquor,
(3) Emulsifying the mixture of the lubricating oil and the polytetrafluoroethylene mother solution at 55 ℃ by using a high-speed emulsifying machine for at least 4 hours to obtain the polytetrafluoroethylene nano lubricating additive,
wherein the engine oil is selected from the group consisting of total synthetic engine oils, semi-synthetic engine oils and mineral engine oils,
wherein when the engine oil is a fully synthetic engine oil, the mass ratio of engine oil to polytetrafluoroethylene nano-lubrication additive in the lubricant is 20-50:1, and the lubricant exhibits a reduced coefficient of friction compared to engine oil alone at a frequency of 35-45 Hz in a friction performance test of an SRV fretting wear tester,
wherein when the engine oil is a semisynthetic oil, the mass ratio of oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 50:1 and the lubricant exhibits a reduced coefficient of friction as compared to engine oil alone at a frequency of 25-35 Hz in an SRV fretting wear tester friction performance test, or the mass ratio of oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 20-30:1 and the lubricant exhibits a reduced coefficient of friction as compared to engine oil alone at a frequency of 35-45 Hz in an SRV fretting wear tester friction performance test,
wherein when the engine oil is mineral engine oil, the mass ratio of engine oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 10:1 and the lubricant exhibits a reduced friction coefficient compared to engine oil alone at a frequency of 25-45 Hz in an SRV fretting wear tester friction performance test, or the mass ratio of engine oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 50:1 and the lubricant exhibits a reduced friction coefficient compared to engine oil alone at a frequency of 25-35 Hz in an SRV fretting wear tester friction performance test, or the mass ratio of engine oil to polytetrafluoroethylene nanolubrication additive in the lubricant is 20-30:1 and the lubricant exhibits a reduced friction coefficient compared to engine oil alone at a frequency of 35-45 Hz in an SRV fretting wear tester friction performance test.
2. The lubricant according to claim 1, wherein the mass ratio of the synthetic lubricating oil to the polytetrafluoroethylene mother liquor is 100:3.
3. The lubricant according to claim 1, wherein the inert gas is selected from nitrogen.
4. The lubricant according to claim 1, wherein in step (2), the stirring is performed at 25 to 55 ℃ and 200 to 800 rpm.
5. The lubricant according to claim 4, wherein in step (2), the stirring is performed at 45 ℃.
6. The lubricant according to claim 1, wherein in step (2), the stirring is performed at 600 rpm.
7. The lubricant according to any one of claims 1 to 6, wherein in step (2), the stirring is performed for 5 to 10 minutes.
8. A process for the preparation of a polytetrafluoroethylene nano-lubricating additive comprising steps (1) to (3) as defined in any one of claims 1 to 7.
9. A polytetrafluoroethylene nano-lubricating additive prepared by the method of claim 8.
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