CN115609989A - Polytetrafluoroethylene sealing material with low friction coefficient and low wear - Google Patents
Polytetrafluoroethylene sealing material with low friction coefficient and low wear Download PDFInfo
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- CN115609989A CN115609989A CN202211635958.9A CN202211635958A CN115609989A CN 115609989 A CN115609989 A CN 115609989A CN 202211635958 A CN202211635958 A CN 202211635958A CN 115609989 A CN115609989 A CN 115609989A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0053—Producing sealings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
Abstract
The invention discloses a polytetrafluoroethylene sealing material with a low friction coefficient and low abrasion, relates to a sealing material with a low friction coefficient, and aims to solve the technical problems that a sealing element in the prior art is high in friction coefficient and easy to abrade. The polytetrafluoroethylene is modified when a polytetrafluoroethylene blank is prepared, iron fibers are added into ingredients, concentrated hydrochloric acid and the iron fibers generate chemical reaction during acid washing, the iron fibers are reacted, and therefore a plurality of holes are formed in the polytetrafluoroethylene blank; then, soaking in a vacuum environment, and fully soaking the lubricating oil into each hole of the polytetrafluoroethylene blank and filling the holes with the lubricating oil; when the sealing material is used, the perfluoropolyether infiltrated in the sealing material is continuously precipitated to a certain extent, the use environment of the sealing material is changed from the original dry friction into the current wet friction, the friction coefficient, the abrasion and the wear of the sealing material are greatly reduced, and the service life of the sealing material is greatly prolonged.
Description
Technical Field
The invention belongs to the technical field of sealing materials, relates to a sealing material with a low friction coefficient, and particularly relates to a polytetrafluoroethylene sealing material with a low friction coefficient and low wear.
Background
Aerospace technology is a highly comprehensive modern scientific technology, and mechanics, thermodynamics and materials science are scientific bases of aerospace; electronic technology, automatic control technology, computer technology, jet propulsion technology and manufacturing technology play an important role in the progress of aerospace. The new material has wide application range in aerospace, especially in the field of sealing materials.
Parts such as rotary joints and landing gears of an aircraft are one of the most important parts in an aircraft. For example, the invention patent application with the application number of 201910948441.7 discloses an integrated rotary joint structure of a actuator cylinder, which is used for arranging a lower fixed point integrated with a tubular shaft and a rotary joint at one end of the actuator cylinder, wherein the rotary joint comprises an upper folding rotary joint and a lower rotary joint, an upper folding rotary joint connecting region, a switching connecting region and a lower rotary joint connecting region are arranged on the tubular shaft, oil in an upper folding cavity of the actuator cylinder is connected to the tubular shaft through a connecting conduit and is communicated with the upper folding rotary joint through an oil duct in the tubular shaft, oil in a lower cavity of the actuator cylinder is communicated with the tubular shaft through an oil duct in an end cover of the actuator cylinder, the oil duct in the tubular shaft is communicated with the lower rotary joint, a universal joint is arranged on the tubular shaft at the rear end of the end cover of the actuator cylinder, the adjusting direction of the universal joint is perpendicular to the rotating direction of the actuator cylinder, so that the actuator cylinder can be laterally adjusted when the actuator cylinder is installed, and the universal joint is respectively connected with the end cover of the upper folding rotary joint and the lower rotary joint, so as to provide examples and reference bases for the design of a hydraulic actuator cylinder of a subsequent aircraft system. The utility model patent application with application number 202221611069.4 discloses a movable hinged sealing structure for an aircraft landing gear, which comprises the aircraft landing gear, wherein a hinged connecting pipe is arranged on the surface of the aircraft landing gear, a connecting rod piece is arranged on the surface of the hinged connecting pipe, and both sides of the connecting rod piece are movably connected with first dismounting blocks; during the use, need place first dismouting piece and second dismouting piece on articulated connecting pipe, make one side of first dismouting piece align with one side of second dismouting piece, later insert the threaded hole with fixed pipe, in order to fix the stopper, thereby install first dismouting piece and second dismouting piece and sealed piece on articulated connecting pipe, when using, utilize sealed piece to seal articulated connecting pipe surface and the both sides of connecting the member, when dismantling, only need take off first dismouting piece and second dismouting piece, remove sealed piece again, with sealed piece take off change can, the step of dismantlement installation is simple and easy, the personnel's of being convenient for quick replacement sealed piece.
The rotary joint, the landing gear, and various parts of the aerospace vehicle such as the aircraft involve the sealing problem in partial rotary motion and reciprocating motion. In the first rotary joint patent, an oil receiving way and an oil discharging way are physically separated from each other inside a pipe shaft, and two side ends of the pipe shaft are sealed by welding a blocking cover after an oil passage is machined through technical holes; in the undercarriage of the second part, the inner walls of the first dismounting block and the second dismounting block are movably connected with sealing blocks, and one side of the moving block is fixedly connected with the sealing blocks. The sealing element used in the above-mentioned rotary motion and reciprocating motion of aerospace vehicles such as airplanes and the like is usually a polytetrafluoroethylene sealing element, and for example, the invention patent with the application number of 202210797289.9 discloses a processing method of a modified polytetrafluoroethylene sealing element, which is used for solving the technical problems of large friction coefficient, poor wear resistance, easy deformation and cracking of the existing polytetrafluoroethylene sealing element; the method comprises the following steps: mixing and sieving raw materials, injecting a sieved product into a sealing element mold for compression molding to prepare a sealing element blank, putting the sealing element blank into a high-pressure high-temperature sintering furnace, gradually heating to 370-380 ℃ in three stages, preserving heat for 4 hours, cooling to 200-210 ℃ in two stages, naturally cooling, and finally processing on a special lathe to prepare a sealing element product; the hardness and tensile strength of the modified polytetrafluoroethylene material used by the method are effectively improved, the abrasion loss and the friction coefficient are lower, the comprehensive performance of the product is greatly improved, the sealing element prepared by the process can not deform or crack, and the processing yield is effectively improved.
In the above-described method for processing polytetrafluoroethylene, a polytetrafluoroethylene material is often modified in the conventional polytetrafluoroethylene seal, and the amount of wear and the coefficient of friction of the material are reduced by improving the hardness and tensile strength of the material. However, the hardness and tensile strength of the material are improved by the modification, the abrasion loss and the friction coefficient of the material are reduced, the material is modified, but the polytetrafluoroethylene sealing element is still in a dry friction environment when in use, and the abrasion loss and the friction coefficient of the sealing element are still higher.
Disclosure of Invention
The invention aims to: in order to solve the technical problems of high friction coefficient of a sealing element and easy abrasion of the sealing element caused by the fact that a polytetrafluoroethylene sealing element is in a dry friction environment during sealing in the prior art, the invention provides the polytetrafluoroethylene sealing material with low friction coefficient and low abrasion.
The invention specifically adopts the following technical scheme for realizing the purpose:
a polytetrafluoroethylene sealing material with low friction coefficient and low abrasion is prepared by the following steps:
step one, preparing an embryo: putting the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber into a stirrer, uniformly mixing, taking out the uniformly mixed material, and sequentially carrying out die pressing and sintering treatment to obtain a polytetrafluoroethylene blank;
step two, acid washing: soaking the polytetrafluoroethylene blank obtained in the step one in concentrated hydrochloric acid to react iron fibers in the polytetrafluoroethylene blank, and forming a plurality of holes in the polytetrafluoroethylene blank after the reaction;
step three, drying: putting the polytetrafluoroethylene blank obtained in the step two into an oven for drying;
step four, soaking: and D, soaking the polytetrafluoroethylene blank dried in the step three in lubricating oil in a soaking bucket, vacuumizing the soaking bucket, and soaking the lubricating oil in holes of the polytetrafluoroethylene blank.
Further, in the step one, when the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber are put into a stirrer, the components are calculated according to the parts by weight: 60-80 parts of suspended polytetrafluoroethylene, 3-6 parts of graphite, 8-10 parts of carbon fiber and 10-15 parts of iron fiber.
In the first step, the graphite is 6000 mesh or less, the carbon fiber is 400 mesh or less, and the iron fiber is 20 mesh or less.
Further, in the first step, the stirring speed of the stirrer is 1500-2000r/min, and the stirring time is 8-10min.
Further, in the second step, when the polytetrafluoroethylene is soaked in the concentrated hydrochloric acid, the soaking time is 3-4 hours.
Further, in the third step, when the polytetrafluoroethylene blank is dried in the oven, the temperature in the oven is 100-120 ℃, and the drying time is 1-1.5h.
Further, in the fourth step, when soaking the polytetrafluoroethylene blank, the lubricating oil is perfluoropolyether lubricating oil.
Further, the perfluoropolyether in the perfluoropolyether lubricating oil is a perfluoropolyether having a molecular weight of 8000 to 15000.
Further, in the fourth step, after the polytetrafluoroethylene blank is soaked in the lubricating oil, the soaking barrel is vacuumized within 3-5min, and then soaked for 1.8-2.5h.
The invention has the following beneficial effects:
according to the method, polytetrafluoroethylene is modified when a polytetrafluoroethylene blank is prepared, iron fibers are added into ingredients, concentrated hydrochloric acid and the iron fibers generate a chemical reaction during acid washing, the iron fibers are reacted, and therefore a plurality of holes are formed in the polytetrafluoroethylene blank; then, soaking in a vacuum environment, and fully soaking the lubricating oil into each hole of the polytetrafluoroethylene blank and filling the holes with the lubricating oil; when the polytetrafluoroethylene sealing material is used, the polytetrafluoroethylene blank soaked with the lubricating oil is taken out and installed and used, and the lubricating oil is soaked in the polytetrafluoroethylene blank, so that the use environment of the polytetrafluoroethylene sealing material is changed from original dry friction into wet friction, the friction coefficient is reduced to 0.008 in the measurement of the friction coefficient of the invention from 0.05 in the original polytetrafluoroethylene (plastic with the lowest friction coefficient), and the friction coefficient of the sealing material is reduced by one order of magnitude.
The sealing material of the invention not only has an ultra-low friction coefficient, but also has very low abrasion, according to GB/T3960-2016, the abrasion value of the conventional modified polytetrafluoroethylene is 1.5 x 10-3g, while the abrasion value of the sealing material of the invention is reduced to 0.025 x 10-3g.
In addition, the sealing material has lower friction coefficient and wear value, so that the service life of the sealing material reaches 40 ten thousand times after the sealing material is applied to the installation environment of an airplane and tested, and the reciprocating dry friction of the part of the airplane generally requires to be qualified under the standard of 2 ten thousand times of repeated tests, so that the service life of the sealing material is greatly prolonged.
Drawings
FIG. 1 is a schematic view of the structure of the sealing material of the present invention, wherein the lower right corner is a partially enlarged view;
FIG. 2 is a temperature-time graph obtained in the test of test example 1;
FIG. 3 is a torque-time curve obtained during the test of test example 1;
FIG. 4 is a graph of rotational speed versus time obtained in the test of test example 1;
FIG. 5 is a graph of friction coefficient versus time obtained in the test of test example 1;
FIG. 6 is a graph of friction coefficient versus temperature obtained in the test of test example 1;
FIG. 7 is a temperature-time curve obtained in the test of test example 2;
FIG. 8 is a torque-time curve obtained in the test of test example 2;
FIG. 9 is a graph of rotational speed versus time obtained in the test of test example 2;
FIG. 10 is a graph of friction coefficient versus time obtained in the test of test example 2;
FIG. 11 is a graph of friction coefficient versus temperature obtained in the test of test example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a polytetrafluoroethylene sealing material with a low friction coefficient and low abrasion, which can be used for sealing parts of a rotary joint and a reciprocating undercarriage which rotate in an airplane.
The sealing material is prepared by the following method:
step one, embryo preparation:
the blank comprises the following components in parts by weight: 60 parts of suspended polytetrafluoroethylene, 3 parts of graphite, 8 parts of carbon fiber and 10 parts of iron fiber; wherein, the graphite is 6000 mesh graphite, the carbon fiber is 400 mesh carbon fiber, and the iron fiber is 20 mesh iron fiber.
The preparation method comprises the following steps: putting the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber into a stirrer, uniformly mixing, stirring at the stirring speed of 1500r/min for 8min, taking out the uniformly mixed materials after stirring, and sequentially performing die pressing and sintering treatment to obtain a polytetrafluoroethylene blank.
If the sealing material has a high processing precision, the polytetrafluoroethylene blank formed after sintering can be processed, for example, machined.
Step two, acid washing: soaking the polytetrafluoroethylene blank obtained in the step one in concentrated hydrochloric acid for 3 hours, and fully reacting the concentrated hydrochloric acid with iron fibers in the blank to dissolve the iron fibers in the blank; after the iron fibers in the polytetrafluoroethylene blank are reacted, a plurality of holes are formed in the polytetrafluoroethylene blank.
Step three, drying: and D, placing the polytetrafluoroethylene blank obtained in the step two into an oven for drying. During drying treatment, the temperature in the oven is 100 ℃, and the drying time is 1h.
Step four, soaking: and (3) soaking the polytetrafluoroethylene blank obtained by drying in the third step in lubricating oil in a soaking barrel, wherein the lubricating oil used for soaking is perfluoropolyether lubricating oil, preferably perfluoropolyether lubricating oil of perfluoropolyether with the molecular weight of about 8000. When soaking, the soaking barrel needs to be vacuumized rapidly, and the vacuumization time is controlled to be completed in the soaking tank 3. After the vacuum pumping is finished, standing until the lubricating oil is fully soaked into the holes of the polytetrafluoroethylene blank, wherein the soaking time is 1.8h.
When the sealing material is used, the sealing material is installed, and in the using process, the perfluoropolyether soaked in the sealing material is continuously precipitated to a certain extent, so that the using environment of the sealing material is changed from the original dry friction into the existing wet friction, the friction coefficient, the abrasion and the wear of the sealing material are greatly reduced, and the service life of the sealing material is greatly prolonged.
Example 2
The embodiment provides a polytetrafluoroethylene sealing material with low friction coefficient and low abrasion, which is prepared by the following method:
step one, preparing an embryo:
the blank comprises the following components in parts by weight: 80 parts of suspended polytetrafluoroethylene, 6 parts of graphite, 10 parts of carbon fiber and 15 parts of iron fiber; wherein, the graphite is 3000 meshes of graphite, the carbon fiber is 150 meshes of carbon fiber, and the iron fiber is 5 meshes of iron fiber.
The preparation method comprises the following steps: putting the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber of the components into a stirrer, uniformly mixing, stirring at the stirring speed of 2000r/min for 10min, and taking out the uniformly mixed materials after stirring to sequentially perform die pressing and sintering treatment to obtain a polytetrafluoroethylene blank.
If the sealing material has a high processing precision, the polytetrafluoroethylene blank formed after sintering can be processed, for example, machined.
Step two, acid washing: soaking the polytetrafluoroethylene blank obtained in the step one in concentrated hydrochloric acid for 4 hours, and fully reacting the concentrated hydrochloric acid with iron fibers in the blank to dissolve the iron fibers in the blank; after the iron fibers in the polytetrafluoroethylene blank are reacted, a plurality of holes are formed in the polytetrafluoroethylene blank.
Step three, drying: and D, putting the polytetrafluoroethylene blank obtained in the step two into an oven for drying. During drying treatment, the temperature in the oven is 120 ℃, and the drying time is 1.5h.
Step four, soaking: and (3) soaking the polytetrafluoroethylene blank obtained by drying in the step three in the lubricating oil in the soaking barrel, wherein the lubricating oil used for soaking is perfluoropolyether lubricating oil, preferably perfluoropolyether lubricating oil of perfluoropolyether with the molecular weight of about 15000. When soaking, the soaking barrel needs to be vacuumized quickly, and the vacuumization time is controlled to be completed within 5min after soaking. After the vacuum pumping is finished, standing until the lubricating oil is fully soaked into the holes of the polytetrafluoroethylene blank, wherein the soaking time is 2.5 hours.
When the sealing material is used, the sealing material is installed, in the using process, the perfluoropolyether infiltrated in the sealing material is continuously precipitated to a certain extent, the using environment of the sealing material is changed into the existing wet friction from the original dry friction, the friction coefficient, the abrasion and the wear of the sealing material are greatly reduced, and the service life of the sealing material is greatly prolonged.
Example 3
The embodiment provides a polytetrafluoroethylene sealing material with a low friction coefficient and low abrasion, which is prepared by the following method:
step one, embryo preparation:
the blank comprises the following components in parts by weight: 64 parts of suspended polytetrafluoroethylene, 4 parts of graphite, 9 parts of carbon fiber and 11 parts of iron fiber; wherein, the graphite is 3800 mesh graphite, the carbon fiber is 210 mesh carbon fiber, and the iron fiber is 9 mesh iron fiber.
The preparation method comprises the following steps: and (2) putting the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber of the components into a stirrer, uniformly mixing, stirring at a stirring speed of 1650r/min for 9min, taking out the uniformly mixed materials after stirring, and sequentially carrying out die pressing and sintering treatment to obtain a polytetrafluoroethylene blank.
If the sealing material has a high processing precision, the polytetrafluoroethylene blank formed after sintering can be processed, for example, machined.
Step two, acid washing: soaking the polytetrafluoroethylene blank obtained in the step one in concentrated hydrochloric acid for 3.2 hours, and fully reacting the concentrated hydrochloric acid with iron fibers in the blank to dissolve the iron fibers in the blank; after the iron fibers in the polytetrafluoroethylene blank are reacted, a plurality of holes are formed in the polytetrafluoroethylene blank.
Step three, drying: and D, putting the polytetrafluoroethylene blank obtained in the step two into an oven for drying. During drying treatment, the temperature in the oven is 105 ℃, and the drying time is 1.1h.
Step four, soaking: and (3) soaking the polytetrafluoroethylene blank obtained by drying in the step three in lubricating oil in a soaking barrel, wherein the lubricating oil used for soaking is perfluoropolyether lubricating oil, preferably perfluoropolyether lubricating oil of perfluoropolyether with the molecular weight of about 9500. When soaking, the soaking barrel needs to be vacuumized rapidly, and the vacuumization time is controlled to be completed within 3.5min after soaking. After the vacuum pumping is finished, standing until the lubricating oil is fully soaked into the holes of the polytetrafluoroethylene blank, wherein the soaking time is 2.0h.
When the sealing material is used, the sealing material is installed, in the using process, the perfluoropolyether infiltrated in the sealing material is continuously precipitated to a certain extent, the using environment of the sealing material is changed into the existing wet friction from the original dry friction, the friction coefficient, the abrasion and the wear of the sealing material are greatly reduced, and the service life of the sealing material is greatly prolonged.
Example 4
The embodiment provides a polytetrafluoroethylene sealing material with low friction coefficient and low abrasion, which can be used for sealing parts of rotary joints and reciprocating landing gears in airplanes.
The sealing material is prepared by the following method:
step one, embryo preparation:
the blank comprises the following components in parts by weight: 76 parts of suspended polytetrafluoroethylene, 5 parts of graphite, 10 parts of carbon fiber and 13 parts of iron fiber; wherein, the graphite is 5200 mesh graphite, the carbon fiber is 350 mesh carbon fiber, and the iron fiber is 15 mesh iron fiber.
The preparation method comprises the following steps: putting the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber of the components into a stirrer, uniformly mixing, stirring at the rotation speed of 1800r/min for 9min, taking out the uniformly mixed materials after stirring, and sequentially carrying out die pressing and sintering treatment to obtain a polytetrafluoroethylene blank.
If the sealing material has a high processing precision, the polytetrafluoroethylene blank formed after sintering can be processed, for example, machined.
Step two, acid washing: soaking the polytetrafluoroethylene blank obtained in the step one in concentrated hydrochloric acid for 3.7 hours to enable the concentrated hydrochloric acid to fully react with the iron fibers in the blank and dissolve the iron fibers in the blank; after the iron fibers in the polytetrafluoroethylene blank are reacted, a plurality of holes are formed in the polytetrafluoroethylene blank.
Step three, drying: and D, placing the polytetrafluoroethylene blank obtained in the step two into an oven for drying. During drying treatment, the temperature in the oven is 115 ℃, and the drying time is 1.3h.
Step four, soaking: soaking the polytetrafluoroethylene blank obtained by drying in the third step in lubricating oil in a soaking barrel, wherein the lubricating oil used for soaking is perfluoropolyether lubricating oil, preferably perfluoropolyether lubricating oil of perfluoropolyether with the molecular weight of about 13500. When soaking, the soaking barrel needs to be vacuumized quickly, and the vacuumization time is controlled to be completed within 4.5min after soaking. After the vacuum pumping is finished, standing until the lubricating oil is fully soaked into the holes of the polytetrafluoroethylene blank, wherein the soaking time is 2.2 hours.
When the sealing material is used, the sealing material is installed, and in the using process, the perfluoropolyether soaked in the sealing material is continuously precipitated to a certain extent, so that the using environment of the sealing material is changed from the original dry friction into the existing wet friction, the friction coefficient, the abrasion and the wear of the sealing material are greatly reduced, and the service life of the sealing material is greatly prolonged.
Test example 1
The polytetrafluoroethylene sealing material obtained in example 1 was used for the test under the following conditions:
the tests were carried out in the test environment described above and the resulting test charts are shown in figures 1-5. Through the tests, the maximum value of the friction coefficient of the polytetrafluoroethylene sealing material is finally measured as follows: 0.115495000, minimum value of 0.000660000, average value: average value: 0.030600543.
test example 2
The test was carried out using conventional polytetrafluoroethylene materials, the test conditions being as follows:
the tests were carried out in the test environment described above and the resulting test charts are shown in figures 6-10. Through the tests, the maximum value of the friction coefficient of the polytetrafluoroethylene sealing material is finally measured as follows: 0.445889000, minimum: 0.210877000, with an average value: average value: 0.345972276.
Claims (9)
1. a polytetrafluoroethylene sealing material with low friction coefficient and low abrasion is characterized by being prepared by the following method:
step one, embryo preparation: putting the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber into a stirrer, uniformly mixing, taking out the uniformly mixed materials, and sequentially carrying out die pressing and sintering treatment to obtain a polytetrafluoroethylene blank;
step two, acid washing: soaking the polytetrafluoroethylene blank obtained in the step one in concentrated hydrochloric acid, reacting to remove iron fibers in the polytetrafluoroethylene blank, and forming a plurality of holes in the polytetrafluoroethylene blank after reaction;
step three, drying: putting the polytetrafluoroethylene blank obtained in the step two into an oven for drying;
step four, soaking: and D, soaking the polytetrafluoroethylene blank dried in the step three in lubricating oil in a soaking barrel, vacuumizing the soaking barrel, and soaking the lubricating oil in holes of the polytetrafluoroethylene blank.
2. The polytetrafluoroethylene sealing material with low friction coefficient and low wear as claimed in claim 1, wherein in the first step, when the suspended polytetrafluoroethylene, graphite, carbon fiber and iron fiber are put into a stirrer, the components are calculated according to the parts by weight: 60-80 parts of suspended polytetrafluoroethylene, 3-6 parts of graphite, 8-10 parts of carbon fiber and 10-15 parts of iron fiber.
3. A polytetrafluoroethylene sealing material with a low friction coefficient and low wear as defined in claim 2 wherein in step one, the graphite is 6000 mesh or less graphite, the carbon fiber is 400 mesh or less carbon fiber, and the iron fiber is 20 mesh or less iron fiber.
4. The polytetrafluoroethylene sealing material with low friction coefficient and low wear as claimed in claim 1 or 2, wherein in the first step, the stirring speed of the stirrer is 1500-2000r/min, and the stirring time is 8-10min.
5. The polytetrafluoroethylene sealing material with low friction coefficient and low wear as defined in claim 1, wherein in the second step, the polytetrafluoroethylene is soaked in concentrated hydrochloric acid for a period of 3-4h.
6. The polytetrafluoroethylene sealing material with low friction coefficient and low wear as claimed in claim 1, wherein in step three, when the polytetrafluoroethylene blank is dried in the oven, the temperature in the oven is 100-120 ℃, and the drying time is 1-1.5h.
7. The polytetrafluoroethylene sealing material with low friction coefficient and low wear according to claim 1 wherein in step four, perfluoropolyether lubricating oil is used as the lubricating oil for soaking the polytetrafluoroethylene blank.
8. A low coefficient of friction, low wear polytetrafluoroethylene seal material in accordance with claim 7 wherein said perfluoropolyether of said perfluoropolyether lubricating oil is perfluoropolyether having a molecular weight of 8000 to 15000.
9. The polytetrafluoroethylene sealing material with low friction coefficient and low wear as claimed in claim 1, wherein in the fourth step, after the polytetrafluoroethylene blank is soaked in the lubricating oil, the soaking barrel is vacuumized within 3-5min and then soaked for 1.8-2.5h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115819822A (en) * | 2023-02-09 | 2023-03-21 | 四川省众望科希盟科技有限公司 | Medium-resistant modified expanded polytetrafluoroethylene sealing material |
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