CN114316486A - Polytetrafluoroethylene lip piece material for sealing element and processing technology thereof - Google Patents
Polytetrafluoroethylene lip piece material for sealing element and processing technology thereof Download PDFInfo
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- CN114316486A CN114316486A CN202210205393.4A CN202210205393A CN114316486A CN 114316486 A CN114316486 A CN 114316486A CN 202210205393 A CN202210205393 A CN 202210205393A CN 114316486 A CN114316486 A CN 114316486A
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- polytetrafluoroethylene
- molybdenum disulfide
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- -1 Polytetrafluoroethylene Polymers 0.000 title claims abstract description 102
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 102
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 102
- 239000000463 material Substances 0.000 title claims abstract description 81
- 238000007789 sealing Methods 0.000 title claims abstract description 42
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 238000012545 processing Methods 0.000 title claims abstract description 13
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 68
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 68
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000004642 Polyimide Substances 0.000 claims abstract description 27
- 229920001721 polyimide Polymers 0.000 claims abstract description 27
- 238000005245 sintering Methods 0.000 claims abstract description 27
- 150000002148 esters Chemical class 0.000 claims abstract description 26
- 229920006389 polyphenyl polymer Polymers 0.000 claims abstract description 26
- 239000004760 aramid Substances 0.000 claims abstract description 25
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 25
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000011787 zinc oxide Substances 0.000 claims abstract description 18
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims abstract description 15
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 40
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 230000005855 radiation Effects 0.000 claims description 24
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 22
- 238000005303 weighing Methods 0.000 claims description 22
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 20
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 12
- 239000011734 sodium Substances 0.000 claims description 12
- 239000002135 nanosheet Substances 0.000 claims description 9
- URXNVXOMQQCBHS-UHFFFAOYSA-N naphthalene;sodium Chemical compound [Na].C1=CC=CC2=CC=CC=C21 URXNVXOMQQCBHS-UHFFFAOYSA-N 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- PBLNBZIONSLZBU-UHFFFAOYSA-N 1-bromododecane Chemical compound CCCCCCCCCCCCBr PBLNBZIONSLZBU-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 8
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 7
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 238000001291 vacuum drying Methods 0.000 claims description 7
- 238000007514 turning Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000003995 emulsifying agent Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000012300 argon atmosphere Substances 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims 1
- 229920006362 Teflon® Polymers 0.000 claims 1
- 238000010894 electron beam technology Methods 0.000 abstract description 7
- 238000002715 modification method Methods 0.000 abstract description 5
- 238000007306 functionalization reaction Methods 0.000 abstract description 4
- 230000013011 mating Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000035882 stress Effects 0.000 description 8
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910000423 chromium oxide Inorganic materials 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 229920000459 Nitrile rubber Polymers 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 125000002252 acyl group Chemical group 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 229920001955 polyphenylene ether Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- 125000004434 sulfur atom Chemical group 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention provides a polytetrafluoroethylene lip material for a sealing element and a processing technology thereof, which limits the added components and the added technology, greatly improves the sealing property of the lip material, reduces the friction property of the lip material, and does not generate severe abrasion and burning phenomena on products and mating parts at the running speed of 60 m/s; polyphenyl ester and polyimide are selected to improve the wear resistance of polytetrafluoroethylene, the mechanical strength of a lip material is synergistically enhanced, and the following performance of an oil seal is improved; modifying polytetrafluoroethylene by using an electron beam irradiation modification method and aromatic polyamide fiber, and grafting lateral branches on a double-spiral chain of the polytetrafluoroethylene; the prepared molybdenum disulfide has covalent functionalization; introducing nano zinc oxide and ethylene bis stearamide; the composite material obtained by batching needs to be placed for 3-5 days and then pressed, segmented sintering is adopted in the sintering process, the service life of the lip material is greatly prolonged, and the service life of the lip material prepared according to the invention is longer than 8 years.
Description
Technical Field
The invention relates to the field of lip materials, in particular to a polytetrafluoroethylene lip material for a sealing element and a processing technology thereof.
Background
With the development of society, high-end equipment such as engineering machinery, commercial passenger vehicles and new energy electric vehicles have higher and higher requirements on the rotating speed of a crankshaft or a transmission input shaft, higher requirements on the sealing performance of a used lip material are provided, and the high-low temperature, high linear speed and high-frequency jumping need to be borne.
At present, the lip materials are made of NBR and FKM rubber, but the lip materials have large friction factors in a poor oil or dry friction state and can be aged and failed due to severe temperature rise of the lip. And the NBR rubber has poor high temperature resistance and high speed resistance, the lip is easy to age and harden, becomes brittle and loses elasticity, and the leakage condition is serious. While FKM rubber is resistant to high temperatures, it is subject to severe wear during high speed rotation and is prone to leakage.
From the nineties of the last century, enterprises continue to produce polytetrafluoroethylene lip materials for sealing elements in China, but the sealing effect is far from the requirement, and the sealing effect is mainly shown in the following steps: the oil pumping effect of the oil seal is not obvious; the following property of the oil seal is poor. If the running linear speed of a motor and an air compressor of the new energy automobile is required to be 40m/s, the requirement cannot be met by common products; and the traditional material is used for the lip piece manufactured by the sealing element, and the polytetrafluoroethylene is mostly used for filling copper powder, so that the lip piece is not wear-resistant, is hard in material, has poor following performance, can cause oil leakage and has short service life.
Disclosure of Invention
The invention aims to provide a polytetrafluoroethylene lip material for a sealing element and a processing technology thereof, and aims to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
the polytetrafluoroethylene lip piece material for the sealing element comprises the following components in parts by weight: 74-81 parts of modified polytetrafluoroethylene, 5-7 parts of polyimide, 5-7 parts of polyphenyl ester, 3-5 parts of molybdenum disulfide, 0.5-1 part of ethylene bis stearamide, 0.5-1 part of inorganic salt and 5-8 parts of nano zinc oxide. The inorganic salt is one or more of zirconia and chromic oxide.
The polytetrafluoroethylene is a high-crystallinity polymer with high and low temperature resistance, chemical corrosion resistance and low friction coefficient, but the pure polytetrafluoroethylene is directly used as a sealing element, so that the rebound resilience and the wear resistance are poor; in the traditional sealing element, copper powder is easy to fill polytetrafluoroethylene to increase the wear resistance, but the following performance of an oil seal is poor; in the invention, the polyphenyl ester and the polyimide are selected to improve the wear resistance, and compared with the addition of metal copper powder, the wear of a mating part is greatly improved, because the friction coefficient of the polyphenyl ester and the polyimide is very low, and the mechanical strength of the lip material is synergistically enhanced by the addition of the polyphenyl ester and the polyimide.
However, the direct blending of polytetrafluoroethylene with polyphenylene ether and polyimide has a problem of compatibility, and the direct blending causes phase separation, so that a lip material with high stability cannot be obtained, and therefore, the polytetrafluoroethylene needs to be modified.
Further, the preparation of the modified polytetrafluoroethylene comprises the following steps: cleaning polytetrafluoroethylene, placing the dried polytetrafluoroethylene in a beam lower region of a high-frequency high-pressure self-shielding electron accelerator, and receiving radiation in vacuum; mixing and stirring aromatic polyamide fiber, potassium hydroxide and dimethyl sulfoxide in an argon atmosphere, adding an OP-10 emulsifier to obtain a grafting solution, immersing the irradiated polytetrafluoroethylene in the grafting solution, reacting at 70-80 ℃ for 20 hours, washing with deionized water for 3-5 times, extracting with acetone, and drying to obtain the modified polytetrafluoroethylene.
Further, the radiation voltage is 0.4MV, and the radiation beam current is 12 mA.
Further, the mass ratio of the aromatic polyamide fiber to the potassium hydroxide is 2: 3; the mass volume ratio of the aromatic polyamide fiber to the dimethyl sulfoxide is 1g:500 mL; the mass part ratio of the polytetrafluoroethylene to the aromatic polyamide fiber is 1: 100.
According to the invention, the electron beam irradiation modification method is utilized, and the aromatic polyamide fiber is used for modifying the polytetrafluoroethylene, so that the electron beam irradiation has the characteristics of high efficiency, environment-friendly process, lasting effect and the like, and meets the existing green production requirement. The invention controls the radiation voltage and radiation beam current of the high-frequency high-pressure self-shielding electron accelerator, irradiates with proper incident energy in the argon gas atmosphere, realizes the grafting modification of the aromatic polyamide fiber on the surface while keeping the body strength, and inhibits the radiation degradation effect of the polytetrafluoroethylene;
by means of electron beam irradiation modification, lateral branches are grafted on a double-spiral chain of polytetrafluoroethylene, the polymerization degree between molecular chains is enhanced, and the wear resistance of the lip material is greatly improved and is more than 10 times that of unmodified polytetrafluoroethylene. Meanwhile, the creep resistance and the recovery performance of the alloy are improved by more than one time, so that the problem of poor follow-up property is solved; and the aromatic polyamide fiber is grafted on the polytetrafluoroethylene by an electron beam irradiation modification method, so that the reaction sites in the material can be greatly improved, the compatibility of the polytetrafluoroethylene with the polyphenyl ester and the polyimide is greatly improved, the entanglement degree of a molecular chain is increased, and the interface compatibility of the polytetrafluoroethylene with the polyphenyl ester and the polyimide is greatly improved because a large number of acyl groups, amino groups and benzene rings exist in the aromatic polyamide fiber and have structural similarity with the benzene rings, the acyl groups and the amino groups in the polyphenyl ester and the polyimide.
The molybdenum disulfide is a high band gap semiconductor with a two-dimensional structure, the electrical insulating property of the polymer is not changed while the elastic modulus, the strength, the wear resistance, the creep resistance and the fatigue resistance of the polymer are improved, and the friction performance of the lip material is further synergistically reduced by adding the molybdenum disulfide and the nano zinc oxide; but the original molybdenum disulfide shows poor solubility in an organic solvent, has amphiphobic property, has poor compatibility with an organic polymer matrix, is easy to agglomerate, has strong van der Waals force among molybdenum disulfide nanosheet layers, tends to be stacked again, greatly reduces the effectiveness of the molybdenum disulfide for improving the organic polymer and the like.
According to the method, molybdenum disulfide nanosheets ultrasonically stripped by a solvent react in a 0.4mol/L solution of sodium naphthalene and tetrahydrofuran, and an S atom lacking electrons has transferred reductive charges, so that negatively charged molybdenum disulfide nanosheets are generated; the molybdenum disulfide prepared by reacting with electrophilic reagent 1-bromododecane at 18-25 ℃ has covalent functionalization.
The prepared molybdenum disulfide benefits from a covalent alkyl chain, has excellent dispersibility and compatibility in polytetrafluoroethylene, polyphenyl ester and polyimide, increases the mutual diffusion and entanglement of macromolecular chains, greatly improves the mechanical strength and wear resistance of the lip material, and improves the thermal stability of the lip material.
Further, the preparation of the molybdenum disulfide comprises the following steps:
(1) mixing and stirring original molybdenum disulfide and an N-methylpyrrolidone solution, performing ultrasonic dispersion to form a suspension, standing for 24 hours, centrifuging for 30 minutes, filtering the upper-layer liquid through a 0.2-micrometer polytetrafluoroethylene filter membrane, washing for 3-5 times by using tetrahydrofuran, acetone, deionized water and ethanol in sequence, and performing vacuum drying to obtain a solvent-stripped molybdenum disulfide nanosheet;
(2) in the nitrogen atmosphere, mixing and stirring anhydrous tetrahydrofuran and naphthalene, adding sodium, completely dissolving, and stirring and reacting in an ice bath for 22 hours to obtain a sodium naphthalene solution; ultrasonically dispersing the molybdenum disulfide stripped by the solvent and anhydrous tetrahydrofuran for 2h, then dripping the molybdenum disulfide and the anhydrous tetrahydrofuran into a sodium naphthalene solution, stirring the mixture in an ice bath for reaction for 22h, then adding 1-bromododecane, reacting the mixture for 24h at the temperature of 18-25 ℃, adding ethanol and deionized water for quenching reaction, performing suction filtration and washing, and performing vacuum drying to obtain the molybdenum disulfide.
Further, the mass volume ratio of the original molybdenum disulfide to the N-methyl pyrrolidone is 1g:9 mL; the mass volume ratio of the anhydrous tetrahydrofuran to the naphthalene is 5.12g to 100 mL; the molar ratio of naphthalene to sodium is 1: 1; the molar volume ratio of the solvent stripped molybdenum disulfide to 1-bromododecane is 0.1mol:10 mL.
The nano zinc oxide is introduced to synergistically improve the wear resistance of the lip material, and when the product runs at a high speed, the nano zinc oxide can accelerate the reduction of the temperature of the material body, so that the condition of internal heat generation of the lip material is effectively improved.
The ethylene bis stearamide is added as a lubricant, and is used for synergistically improving the heat resistance and the weather resistance of the aromatic polyamide fiber, endowing the lip material with certain antistatic property, and reducing the occurrence of broken lines in the pressing process of the lip material.
Further, the processing technology comprises the following steps:
s1: weighing: weighing modified polytetrafluoroethylene, polyimide, polyphenyl ester, molybdenum disulfide, ethylene bis stearamide, inorganic salt and nano zinc oxide according to parts by weight for later use;
s2: mixing materials: adding modified polytetrafluoroethylene, polyimide and polyphenyl ester through a main feeding port of a double-screw extruder, adding molybdenum disulfide, ethylene bis stearamide, inorganic salt and nano zinc oxide through an auxiliary feeding port of the double-screw extruder, carrying out melt blending extrusion, and cooling to obtain a composite material;
s3: placing: placing the composite material at 18-25 ℃ for 3-5 days;
s4: pressing: placing the composite material on a hydraulic machine for pressing by using a mould device;
s5: and (3) sintering: sintering in a sintering furnace within a temperature range;
s6: machining: and turning the product size by using a numerical control lathe to obtain the polytetrafluoroethylene lip piece material for the sealing element.
Further, the pressing pressure in step S4 is 30-60 MPa. The pressing pressure in step S4 is defined according to the desired product thickness.
Further, the sintering temperature in the step S5 is 360-385 ℃; the heat preservation time is 3-4 h.
The sintering in the step S5 is sectional sintering, the temperature is raised from 20 ℃ to 80 ℃ at the speed of 50 ℃/h, the temperature is kept for 1-2h, then the temperature is raised to 180 ℃ at the speed of 40 ℃/h, the temperature is kept for 2h, then the temperature is raised to 300 ℃ at the speed of 35 ℃/h, the temperature is kept for 1h, the temperature is raised to 360-385 ℃ at the speed of 25 ℃/h, the temperature is kept for 3-4h, then the temperature is lowered to 300 ℃ at the speed of 35 ℃/h, and the temperature is lowered to 180 ℃ at the speed of 40 ℃/h. The invention adopts the sectional sintering to process the pressed material, can greatly reduce the cracks generated by the internal stress, improve the stability of the structure of the lip material and greatly prolong the service life of the lip material.
And further, turning out the main sealing lip, the auxiliary sealing lip and the dust-proof lip by using a polytetrafluoroethylene lip sheet material for the sealing element, and then sequentially assembling the stainless steel inner bone, the main sealing lip, the polytetrafluoroethylene gasket, the auxiliary sealing lip, the dust-proof lip and the stainless steel outer bone to obtain the sealing element.
The reason that the composite material prepared by mixing the materials has certain internal stress and static electricity is that the composite material is placed for 3-5 days, and the stress and the static electricity in the lip material can be reduced after the composite material is placed for 3-5 days, so that cracks caused by the internal stress in the subsequent pressing process are prevented, and the antistatic effect of the lip material is improved.
The invention has the beneficial effects that:
the invention provides a polytetrafluoroethylene lip material for a sealing element and a processing technology thereof, which have excellent sealing performance by limiting added component components and process design, greatly reduce the friction performance of a product, have the friction coefficient of 1/10 of the traditional material, and do not generate severe abrasion and burning phenomena on the product and a mating part at the running speed of 60 m/s;
in the invention, the wear resistance of polytetrafluoroethylene is improved by selecting the polyphenyl ester and the polyimide, compared with the addition of metal copper powder, the wear of mating parts is greatly improved, and the mechanical strength of a lip material is synergistically enhanced by adding the polyphenyl ester and the polyimide, so that the following property of an oil seal is improved;
according to the invention, an electron beam irradiation modification method is utilized to modify polytetrafluoroethylene by using aromatic polyamide fibers, lateral branches are grafted on a double-spiral chain of the polytetrafluoroethylene, the polymerization degree between molecular chains is enhanced, the compatibility problem of the polytetrafluoroethylene with polyphenyl ester and polyimide is improved, the radiation voltage and the radiation beam current of a high-frequency high-pressure self-shielding electron accelerator are controlled, irradiation is carried out under the atmosphere of argon gas by proper incident energy, the graft modification of the aromatic polyamide fibers on the surface is realized while the body strength is kept, and the radiation degradation effect of the polytetrafluoroethylene is inhibited; the wear resistance, creep resistance and recovery performance of the lip material are greatly improved, and the problem of poor follow-up performance is solved;
the molybdenum disulfide prepared by the invention has covalent functionalization, improves the dispersion uniformity and compatibility of the molybdenum disulfide in polytetrafluoroethylene, polyphenyl ester and polyimide, increases the mutual diffusion and entanglement of macromolecular chains, greatly improves the mechanical strength and wear resistance of a lip material, and improves the thermal stability of the lip material;
the nano zinc oxide is introduced to synergistically improve the wear resistance of the lip material, and when the product runs at a high speed, the nano zinc oxide can accelerate the reduction of the temperature of the material body, so that the condition of internal heat generation of the lip material is effectively improved; the ethylene bis stearamide is added as a lubricant, and meanwhile, the heat resistance and the weather resistance of the aromatic polyamide fiber are synergistically improved, so that the lip material is endowed with certain antistatic property, and the occurrence of broken lines in the pressing process of the lip material can be reduced;
the composite material prepared by proportioning according to the invention needs to be placed for 3-5 days and then pressed, cracks caused by internal stress in the subsequent pressing process are prevented, segmented sintering is adopted in the sintering process, the structural stress of the lip material is greatly improved, the service life of the lip material is greatly prolonged, and the service life of the lip material prepared according to the invention is longer than 8 years and is superior to that of the existing imported products used in batches.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that if directional indications such as up, down, left, right, front, and back … … are involved in the embodiment of the present invention, the directional indications are only used to explain a specific posture, such as a relative positional relationship between components, a motion situation, and the like, and if the specific posture changes, the directional indications also change accordingly. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The technical solutions of the present invention are further described in detail with reference to specific examples, which should be understood that the following examples are only illustrative of the present invention and are not intended to limit the present invention.
Example 1
A processing technology of a polytetrafluoroethylene lip material for a sealing element comprises the following steps:
s1: weighing: weighing 74 parts of modified polytetrafluoroethylene, 7 parts of polyimide, 6 parts of polyphenyl ester, 3 parts of molybdenum disulfide, 1 part of ethylene bis stearamide, 1 part of chromium oxide and 8 parts of nano zinc oxide in parts by weight for later use;
s2: mixing materials: adding modified polytetrafluoroethylene, polyimide and polyphenyl ester through a main feeding port of a double-screw extruder, adding molybdenum disulfide, ethylene bis stearamide, chromium oxide and nano zinc oxide through an auxiliary feeding port of the double-screw extruder, carrying out melt blending extrusion, and cooling to obtain a composite material;
the preparation of the modified polytetrafluoroethylene comprises the following steps: (1) cleaning polytetrafluoroethylene, placing the dried polytetrafluoroethylene in a beam area of an AB0.5-60 high-frequency high-pressure self-shielding electron accelerator (Seldless Aibang radiation technology Co., Ltd.), and irradiating under vacuum with the radiation voltage of 0.4MV and the radiation beam current of 12 mA; weighing 2g of aromatic polyamide fiber and 3g of potassium hydroxide by using a balance, putting the aromatic polyamide fiber and the potassium hydroxide into a 2000mL beaker, adding 1000mL of dimethyl sulfoxide, adding 0.5 mass percent of OP-10 emulsifier, carrying out deoxidization treatment to obtain a grafted solution, immersing the irradiated polytetrafluoroethylene into the grafted solution, reacting for 20 hours at 70 ℃, washing the grafted polytetrafluoroethylene with deionized water for 3 times, extracting with acetone, and drying to obtain modified polytetrafluoroethylene;
the preparation method of the molybdenum disulfide comprises the following steps:
(1) weighing 5g of original molybdenum disulfide, adding the original molybdenum disulfide into 45mL of N-methylpyrrolidone solution, performing ultrasonic dispersion to form a suspension, wherein the diameter of an ultrasonic rod is 6mm (power is 500W, amplitude is 25%), and standing for 24 hours at 1000 r.min-1Centrifuging for 30min at the speed of (1), filtering the upper layer liquid through a polytetrafluoroethylene filter membrane of 0.2 mu m, washing for 3 times by using tetrahydrofuran, acetone, deionized water and ethanol in sequence, and drying in vacuum to obtain a solvent-stripped molybdenum disulfide nanosheet;
(2) in a nitrogen atmosphere, adding 100mL of anhydrous tetrahydrofuran and 0.04mol of naphthalene into a flask, dissolving, weighing 0.92g of sodium, adding, cutting into small pieces, and stirring in an ice bath for reaction for 22h to obtain a sodium naphthalene solution after the sodium is completely dissolved; weighing 160mg of molybdenum disulfide stripped by a solvent, adding the molybdenum disulfide into 40mL of anhydrous tetrahydrofuran, performing ultrasonic dispersion for 2h, slowly dropping the molybdenum disulfide into a sodium naphthalene solution, stirring in an ice bath for reaction for 22h, then slowly dropping 10mL of 1-bromododecane (0.04mol), continuing to react at room temperature for 24h, finally adding ethanol, performing a quenching reaction by using deionized water, performing suction filtration and washing, and performing vacuum drying to obtain molybdenum disulfide;
s3: placing: the composite material is placed at 18 ℃ for 5 days;
s4: pressing: placing the composite material on a hydraulic machine for pressing by using a mould device; the pressing pressure is 30 MPa;
s5: and (3) sintering: sintering in a sintering furnace;
heating from 20 ℃ to 80 ℃ at the speed of 50 ℃/h, preserving heat for 1h, heating to 180 ℃ at the speed of 40 ℃/h, preserving heat for 2h, heating to 300 ℃ at the speed of 35 ℃/h, preserving heat for 1h, heating to 360 ℃ at the speed of 25 ℃/h, preserving heat for 4h, cooling to 300 ℃ at the speed of 35 ℃/h, and cooling to 180 ℃ at the speed of 40 ℃/h;
s6: machining: and turning the product size by using a numerical control lathe to obtain the polytetrafluoroethylene lip piece material for the sealing element.
Example 2
A processing technology of a polytetrafluoroethylene lip material for a sealing element comprises the following steps:
s1: weighing: weighing 78 parts of modified polytetrafluoroethylene, 6 parts of polyimide, 5 parts of polyphenyl ester, 4 parts of molybdenum disulfide, 0.8 part of ethylene bis stearamide, 0.8 part of chromium oxide and 5.4 parts of nano zinc oxide according to parts by weight for later use;
s2: mixing materials: adding modified polytetrafluoroethylene, polyimide and polyphenyl ester through a main feeding port of a double-screw extruder, adding molybdenum disulfide, ethylene bis stearamide, chromium oxide and nano zinc oxide through an auxiliary feeding port of the double-screw extruder, carrying out melt blending extrusion, and cooling to obtain a composite material;
the preparation of the modified polytetrafluoroethylene comprises the following steps: (1) cleaning polytetrafluoroethylene, placing the dried polytetrafluoroethylene in a beam area of an AB0.5-60 high-frequency high-pressure self-shielding electron accelerator (Seldless Aibang radiation technology Co., Ltd.), and irradiating under vacuum with the radiation voltage of 0.42MV and the radiation beam current of 12.5 mA; weighing 2g of aromatic polyamide fiber and 3g of potassium hydroxide by using a balance, putting the aromatic polyamide fiber and the potassium hydroxide into a 2000mL beaker, adding 1000mL of dimethyl sulfoxide, adding 0.5 mass percent of OP-10 emulsifier, carrying out oxygen removal treatment to obtain a grafted solution, immersing the irradiated polytetrafluoroethylene into the grafted solution, reacting for 20 hours at 75 ℃, washing the grafted polytetrafluoroethylene with deionized water for 4 times, extracting with acetone, and drying to obtain modified polytetrafluoroethylene;
the preparation method of the molybdenum disulfide comprises the following steps:
(1) weighing 5g of original molybdenum disulfide, adding the original molybdenum disulfide into 45mL of N-methylpyrrolidone solution, performing ultrasonic dispersion to form a suspension, wherein the diameter of an ultrasonic rod is 6mm (power is 500W, amplitude is 25%), and standing for 24 hours at 1000 r.min-1Centrifuging for 30min at the speed of (1), filtering the upper layer liquid through a polytetrafluoroethylene filter membrane of 0.2 mu m, washing for 4 times by using tetrahydrofuran, acetone, deionized water and ethanol in sequence, and drying in vacuum to obtain a solvent-stripped molybdenum disulfide nanosheet;
(2) in a nitrogen atmosphere, adding 100mL of anhydrous tetrahydrofuran and 0.04mol of naphthalene into a flask, dissolving, weighing 0.92g of sodium, adding, cutting into small pieces to ensure a contact surface, and stirring in an ice bath for reaction for 22h to obtain a naphthalene/sodium solution system after the sodium is completely dissolved; weighing 160mg of solvent-stripped molybdenum disulfide, adding the solvent-stripped molybdenum disulfide into 40mL of anhydrous tetrahydrofuran, performing ultrasonic dispersion for 2h, slowly dropping the solvent-stripped molybdenum disulfide into a naphthalene/sodium solution, stirring in an ice bath for reaction for 22h, then slowly dropping 10mL of 1-bromododecane (0.04mol), continuing the reaction for 24h at room temperature, finally adding ethanol, performing a quenching reaction by using deionized water, performing suction filtration and washing, and performing vacuum drying to obtain molybdenum disulfide;
s3: placing: the composite material is placed at 20 ℃ for 4 days;
s4: pressing: placing the composite material on a hydraulic machine for pressing by using a mould device; the pressing pressure is 40 MPa;
s5: and (3) sintering: sintering in a sintering furnace;
heating from 20 ℃ to 80 ℃ at the speed of 50 ℃/h, preserving heat for 1.5h, heating to 180 ℃ at the speed of 40 ℃/h, preserving heat for 2h, heating to 300 ℃ at the speed of 35 ℃/h, preserving heat for 1h, heating to 375 ℃ at the speed of 25 ℃/h, preserving heat for 3.5h, cooling to 300 ℃ at the speed of 35 ℃/h, and cooling to 180 ℃ at the speed of 40 ℃/h;
s6: machining: and turning the product size by using a numerical control lathe to obtain the polytetrafluoroethylene lip piece material for the sealing element.
Example 3
A processing technology of a polytetrafluoroethylene lip material for a sealing element comprises the following steps:
s1: weighing: weighing 81 parts of modified polytetrafluoroethylene, 5 parts of polyimide, 5 parts of polyphenyl ester, 3 parts of molybdenum disulfide, 0.5 part of ethylene bis stearamide, 0.5 part of zirconium oxide and 5 parts of nano zinc oxide according to parts by weight for later use;
s2: mixing materials: adding modified polytetrafluoroethylene, polyimide and polyphenyl ester through a main feeding port of a double-screw extruder, adding molybdenum disulfide, ethylene bis stearamide, zirconium oxide and nano zinc oxide through an auxiliary feeding port of the double-screw extruder, carrying out melt blending extrusion, and cooling to obtain a composite material;
the preparation of the modified polytetrafluoroethylene comprises the following steps: (1) cleaning polytetrafluoroethylene, placing the dried polytetrafluoroethylene in a beam area of an AB0.5-60 high-frequency high-pressure self-shielding electron accelerator (Seldless Aibang radiation technology Co., Ltd.), and irradiating under vacuum with the radiation voltage of 0.45MV and the radiation beam current of 13 mA; weighing 2g of aromatic polyamide fiber and 3g of potassium hydroxide by using a balance, putting the aromatic polyamide fiber and the potassium hydroxide into a 2000mL beaker, adding 1000mL of dimethyl sulfoxide, adding 0.5 mass percent of OP-10 emulsifier, carrying out oxygen removal treatment to obtain a grafted solution, immersing the irradiated polytetrafluoroethylene into the grafted solution, reacting for 20 hours at 70-80 ℃, washing the grafted polytetrafluoroethylene with deionized water for 5 times, extracting with acetone, and drying to obtain modified polytetrafluoroethylene;
the preparation method of the molybdenum disulfide comprises the following steps:
(1) weighing 5g of original molybdenum disulfide, adding the original molybdenum disulfide into 45mL of N-methylpyrrolidone solution, performing ultrasonic dispersion to form a suspension, wherein the diameter of an ultrasonic rod is 6mm (power is 500W, amplitude is 25%), and standing for 24 hours at 1000 r.min-1Centrifuging for 30min at the speed of (1), filtering the upper layer liquid through a polytetrafluoroethylene filter membrane of 0.2 mu m, washing for 5 times by using tetrahydrofuran, acetone, deionized water and ethanol in sequence, and drying in vacuum to obtain a solvent-stripped molybdenum disulfide nanosheet;
(2) in a nitrogen atmosphere, adding 100mL of anhydrous tetrahydrofuran and 0.04mol of naphthalene into a flask, dissolving, weighing 0.92g of sodium, adding, cutting into small pieces, and stirring in an ice bath for reaction for 22h to obtain a sodium naphthalene solution after the sodium is completely dissolved; weighing 160mg of molybdenum disulfide stripped by a solvent, adding the molybdenum disulfide into 40mL of anhydrous tetrahydrofuran, performing ultrasonic dispersion for 2h, slowly dropping the molybdenum disulfide into a sodium naphthalene solution, stirring in an ice bath for reaction for 22h, then slowly dropping 10mL of 1-bromododecane (0.04mol), continuing to react at room temperature for 24h, finally adding ethanol, performing a quenching reaction by using deionized water, performing suction filtration and washing, and performing vacuum drying to obtain molybdenum disulfide;
s3: placing: placing the composite material at 25 ℃ for 3 days;
s4: pressing: placing the composite material on a hydraulic machine for pressing by using a mould device; the pressing pressure is 60 MPa;
s5: and (3) sintering: sintering in a sintering furnace;
heating from 20 ℃ to 80 ℃ at the speed of 50 ℃/h, preserving heat for 2h, heating to 180 ℃ at the speed of 40 ℃/h, preserving heat for 2h, heating to 300 ℃ at the speed of 35 ℃/h, preserving heat for 1h, heating to 385 ℃ at the speed of 25 ℃/h, preserving heat for 3h, cooling to 300 ℃ at the speed of 35 ℃/h, and cooling to 180 ℃ at the speed of 40 ℃/h;
s6: machining: and turning the product size by using a numerical control lathe to obtain the polytetrafluoroethylene lip piece material for the sealing element.
Comparative example 1
The control group of example 2 was used, and the irradiation voltage was 0.3MV and the beam current was 11.5mA, and the other steps were normal.
Comparative example 2
The control group of example 2 was used, and the irradiation voltage was 0.5MV and the beam current was 13.5mA, and the other steps were normal.
Comparative example 3
The modified polytetrafluoroethylene was replaced with polytetrafluoroethylene as a control with example 2, and the other steps were normal.
Comparative example 4
And (3) taking the example 2 as a control group, replacing molybdenum disulfide by molybdenum disulfide nanosheets, and enabling other procedures to be normal.
Comparative example 5
Taking the example 2 as a control group, the composite material is directly pressed without being placed for 3-5 days, and other procedures are normal.
Comparative example 6
Taking the example 2 as a control group, directly heating the temperature from 20 ℃ to 375 ℃ at a speed of 50 ℃/h in the sintering process, and keeping the temperature for 3.5h, wherein other procedures are normal.
And (3) performance testing: the lip materials prepared in examples 1 to 3 and comparative examples 1 to 6 were subjected to a performance test;
the friction coefficient and the grinding mark width of the prepared lip material are measured by referring to GB/T3960-2016, wherein the load is 196N, the rotating speed is 200r/min, and the time is 2 h;
an equivalent simulation experiment oil leakage test is carried out with reference to GB/T32217-: when the oil leakage is less than 1 drop, the measurement time is prolonged to be converted, for example, 0.5 drop/min represents that the 1 st drop of oil starts to leak at the 50 th min actually.
Combining with actual working conditions, according to the working mechanism of the sealing position of the vehicle engine, and aiming at the main factors influencing the sealing oil leakage, such as vibration, load, working temperature, working spectrum and the like, establishing test conditions for simulation; axial load is applied through a hydraulic device, radial load is applied through a pneumatic device, and the axial load and the radial load act together to simulate the load borne by a mechanism at a sealing position; the temperature of the inlet fuel of the test piece is controlled by the closed circulation temperature control device of the tester, so that the temperature of the sealing mechanism is basically consistent with the test-run temperature of the rack.
Converting actual test temperature and load through equivalent simulation, wherein the cycle times of 200 ten thousand is 1 ten thousand hour stroke reciprocating, the surface roughness of the piston rod is 0.15, the diameter of the piston rod is 36mm, and the hardness of the nitrile rubber dust ring is 75 IRHD; measuring the oil leakage by using a measuring cup; specific data are shown in table 1;
TABLE 1
Examples 1 to 3 are composite mud guards prepared according to the present invention, comparing example 2 with comparative examples 1 to 3, it can be known that polytetrafluoroethylene is modified by aromatic polyamide fiber by electron beam irradiation modification method, side branches are grafted on double helical chains of polytetrafluoroethylene, polymerization degree between molecular chains is enhanced, compatibility problem of polytetrafluoroethylene, polyphenyl ester and polyimide is improved, radiation voltage and radiation beam current of high frequency high voltage type self-shielding electron accelerator are controlled, irradiation is performed with proper incident energy under argon atmosphere, surface aromatic polyamide fiber grafting modification is realized while keeping body strength, and radiation degradation effect of polytetrafluoroethylene is inhibited; by matching with corresponding process design, the wear resistance, creep resistance and recovery performance of the lip material are greatly improved, and the problem of poor follow-up performance is solved;
comparing the example 2 with the comparative example 4, it can be seen that the molybdenum disulfide prepared by the invention has covalent functionalization, the dispersion uniformity and compatibility of the molybdenum disulfide in polytetrafluoroethylene, polyphenyl ester and polyimide are improved, the mutual diffusion and entanglement of macromolecular chains are increased, the mechanical strength and the wear resistance of the lip material are greatly improved, and the thermal stability of the lip material is improved;
comparing the example 2 with the comparative example 5, it can be seen that the composite material prepared by blending needs to be placed for 3-5 days and then pressed, so that cracks caused by internal stress in the subsequent pressing process are prevented;
comparing the example 2 with the comparative example 6, it can be seen that the step sintering is adopted in the sintering process, the heating rate and the heating temperature in the sintering process are controlled, the structural stress of the lip material is greatly improved, and the service life of the lip material is greatly prolonged.
In conclusion, the lip material prepared by the invention has excellent mechanical property, the sealing effect is equivalent to that of 25 ℃ in a high-temperature environment of 180 ℃, and the high-temperature wear resistance and the normal-temperature wear resistance are excellent, and the lip material is ageing-resistant and has a good application prospect.
The above description is only an example of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A processing technology of a polytetrafluoroethylene lip material for a sealing element is characterized by comprising the following steps:
s1: weighing: weighing modified polytetrafluoroethylene, polyimide, polyphenyl ester, molybdenum disulfide, ethylene bis stearamide, inorganic salt and nano zinc oxide according to parts by weight for later use;
s2: mixing materials: adding modified polytetrafluoroethylene, polyimide and polyphenyl ester through a main feeding port of a double-screw extruder, adding molybdenum disulfide, ethylene bis stearamide, inorganic salt and nano zinc oxide through an auxiliary feeding port of the double-screw extruder, carrying out melt blending extrusion, and cooling to obtain a composite material;
s3: placing: placing the composite material at 18-25 ℃ for 3-5 days;
s4: pressing: placing the composite material on a hydraulic machine for pressing by using a mould device;
s5: and (3) sintering: sintering in a sintering furnace;
s6: machining: and turning the product size by using a numerical control lathe to obtain the polytetrafluoroethylene lip piece material for the sealing element.
2. The processing technology of the polytetrafluoroethylene lip material for the sealing element according to claim 1, wherein the lip material comprises the following components in parts by weight: 74-81 parts of modified polytetrafluoroethylene, 5-7 parts of polyimide, 5-7 parts of polyphenyl ester, 3-5 parts of molybdenum disulfide, 0.5-1 part of ethylene bis stearamide, 0.5-1 part of inorganic salt and 5-8 parts of nano zinc oxide.
3. The process of claim 1, wherein the pressure applied in step S4 is 30-60 MPa.
4. The process of claim 1, wherein the step S5 comprises heating to 80 ℃ from 20 ℃ at a rate of 50 ℃/h, maintaining the temperature for 1-2h, heating to 180 ℃ at a rate of 40 ℃/h, maintaining the temperature for 2h, heating to 300 ℃ at a rate of 35 ℃/h, maintaining the temperature for 1h, heating to 385 ℃ at a rate of 25 ℃/h, maintaining the temperature for 3-4h, cooling to 300 ℃ at a rate of 35 ℃/h, and cooling to 180 ℃ at a rate of 40 ℃/h.
5. The process for preparing a polytetrafluoroethylene lip material for sealing members according to claim 1, wherein said modified polytetrafluoroethylene is prepared by the steps of: cleaning polytetrafluoroethylene, placing the dried polytetrafluoroethylene in a beam lower region of a high-frequency high-pressure self-shielding electron accelerator, and receiving radiation in vacuum; mixing and stirring aromatic polyamide fiber, potassium hydroxide and dimethyl sulfoxide in an argon atmosphere, adding an OP-10 emulsifier to obtain a grafting solution, immersing the irradiated polytetrafluoroethylene in the grafting solution, reacting at 70-80 ℃ for 20 hours, washing with deionized water for 3-5 times, extracting with acetone, and drying to obtain the modified polytetrafluoroethylene.
6. The process for manufacturing a teflon lip material for a sealing member as recited in claim 5, wherein the radiation voltage is 0.4-0.45MV and the radiation beam current is 12-13 mA.
7. The process for preparing a polytetrafluoroethylene lip material for sealing members according to claim 5, wherein the mass ratio of the aromatic polyamide fiber to the potassium hydroxide is 2: 3; the mass volume ratio of the aromatic polyamide fiber to the dimethyl sulfoxide is 1g:500 mL; the mass part ratio of the polytetrafluoroethylene to the aromatic polyamide fiber is 1: 100.
8. The process for manufacturing polytetrafluoroethylene lip material for sealing parts according to claim 1, wherein the preparation of molybdenum disulfide comprises the following steps:
(1) mixing and stirring original molybdenum disulfide and an N-methylpyrrolidone solution, performing ultrasonic dispersion to form a suspension, standing for 24 hours, centrifuging for 30 minutes, filtering the upper-layer liquid through a 0.2-micrometer polytetrafluoroethylene filter membrane, washing for 3-5 times by using tetrahydrofuran, acetone, deionized water and ethanol in sequence, and performing vacuum drying to obtain a solvent-stripped molybdenum disulfide nanosheet;
(2) in the nitrogen atmosphere, mixing and stirring anhydrous tetrahydrofuran and naphthalene, adding sodium, completely dissolving, and stirring and reacting in an ice bath for 22 hours to obtain a sodium naphthalene solution; ultrasonically dispersing the molybdenum disulfide stripped by the solvent and anhydrous tetrahydrofuran for 2h, then dripping the molybdenum disulfide and the anhydrous tetrahydrofuran into a sodium naphthalene solution, stirring the mixture in an ice bath for reaction for 22h, then adding 1-bromododecane, reacting the mixture for 24h at the temperature of 18-25 ℃, adding ethanol and deionized water for quenching reaction, performing suction filtration and washing, and performing vacuum drying to obtain the molybdenum disulfide.
9. The processing technology of polytetrafluoroethylene lip material for sealing elements according to claim 8, wherein the mass-to-volume ratio of the original molybdenum disulfide to the N-methylpyrrolidone is 1g:9 mL; the mass volume ratio of the anhydrous tetrahydrofuran to the naphthalene is 5.12g to 100 mL; the molar ratio of naphthalene to sodium is 1: 1; the molar volume ratio of the solvent stripped molybdenum disulfide to 1-bromododecane is 0.1mol:10 mL.
10. A polytetrafluoroethylene lip stock for seals, processed according to the process of any one of claims 1 to 9.
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