CN114458763B - Rotary sealing element for air compressor and preparation method thereof - Google Patents
Rotary sealing element for air compressor and preparation method thereof Download PDFInfo
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- CN114458763B CN114458763B CN202210077343.2A CN202210077343A CN114458763B CN 114458763 B CN114458763 B CN 114458763B CN 202210077343 A CN202210077343 A CN 202210077343A CN 114458763 B CN114458763 B CN 114458763B
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- 238000007789 sealing Methods 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 79
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 79
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 66
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 66
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 44
- 239000010935 stainless steel Substances 0.000 claims abstract description 44
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 42
- 239000011787 zinc oxide Substances 0.000 claims abstract description 33
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 29
- 239000004642 Polyimide Substances 0.000 claims abstract description 16
- 229920001721 polyimide Polymers 0.000 claims abstract description 16
- 150000002148 esters Chemical class 0.000 claims abstract description 15
- 229920006389 polyphenyl polymer Polymers 0.000 claims abstract description 15
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 54
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 40
- 238000003756 stirring Methods 0.000 claims description 25
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 23
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 20
- 239000011347 resin Substances 0.000 claims description 20
- 229920005989 resin Polymers 0.000 claims description 20
- 238000005406 washing Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 18
- 239000000945 filler Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- XSHISXQEKIKSGC-UHFFFAOYSA-N 2-aminoethyl 2-methylprop-2-enoate;hydron;chloride Chemical compound Cl.CC(=C)C(=O)OCCN XSHISXQEKIKSGC-UHFFFAOYSA-N 0.000 claims description 15
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 14
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 14
- 238000005245 sintering Methods 0.000 claims description 14
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 14
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 12
- 239000011265 semifinished product Substances 0.000 claims description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 10
- 239000011790 ferrous sulphate Substances 0.000 claims description 10
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 10
- MTEZSDOQASFMDI-UHFFFAOYSA-N 1-trimethoxysilylpropan-1-ol Chemical compound CCC(O)[Si](OC)(OC)OC MTEZSDOQASFMDI-UHFFFAOYSA-N 0.000 claims description 8
- QLIBJPGWWSHWBF-UHFFFAOYSA-N 2-aminoethyl methacrylate Chemical compound CC(=C)C(=O)OCCN QLIBJPGWWSHWBF-UHFFFAOYSA-N 0.000 claims description 7
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000004108 freeze drying Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 238000000748 compression moulding Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000011256 inorganic filler Substances 0.000 abstract description 9
- 239000012766 organic filler Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 30
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- PZJJKWKADRNWSW-UHFFFAOYSA-N trimethoxysilicon Chemical compound CO[Si](OC)OC PZJJKWKADRNWSW-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- ZDWQSEWVPQWLFV-UHFFFAOYSA-N C(CC)[Si](OC)(OC)OC.[O] Chemical compound C(CC)[Si](OC)(OC)OC.[O] ZDWQSEWVPQWLFV-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a rotary sealing element for an air compressor and a preparation method thereof, wherein the rotary sealing element comprises a stainless steel inner bone, a main sealing lip, a PTFE gasket, an auxiliary sealing lip, a dust lip and a stainless steel outer bone, and the inner diameter and the outer diameter of the rotary sealing element are concentric; the stainless steel inner bone is embedded into the stainless steel outer bone and fixed into a skeleton whole; the main sealing lip, the PTFE gasket and the auxiliary sealing lip are tightly embedded between the stainless steel inner bone and the stainless steel outer bone, the main sealing lip is used for abutting against the inner wall of the stainless steel inner bone, and the dust lip is used for abutting against the inner wall of the stainless steel outer bone. Polyimide and polyphenyl ester are used as organic fillers, flaky molybdenum disulfide and nano zinc oxide are used as inorganic fillers, and modified polytetrafluoroethylene is matched to obtain the rotary sealing element for the air compressor, which has the advantages of good wear resistance, high creep resistance and long service life and can meet the requirement of high linear speed.
Description
Technical Field
The invention relates to the technical field of sealing elements, in particular to a rotary sealing element for an air compressor and a preparation method thereof.
Background
In recent years, with the progress of green sustainable development, new energy automobiles are still used as emerging green vehicles, and are greatly supported by the nation. In a new energy automobile, a motor and an air compressor are core components; the rotary sealing element for the air compressor has high linear speed, so that the rotary sealing element has serious frictional heat and serious abrasion in reciprocating motion, so that domestic products cannot be met at the present stage and are always in an imported state. Therefore, the preparation of a rotary sealing element which can meet the requirement of higher linear speed is of great significance.
In the traditional rotary sealing element, the advantages of excellent corrosion resistance, high temperature resistance, self-lubrication, low friction coefficient and the like of a polytetrafluoroethylene material are utilized, and the rotary sealing element is widely applied to the rotary sealing element. However, their high wear rate, low hardness, low creep resistance, and the like, severely limit their use. In the prior art, the sealing element is usually formed by mixing and sintering filler and polytetrafluoroethylene at high temperature, the filler is modified by using the advantages of the filler, the existing defects are optimized and complemented, the friction coefficient is reduced, and the thermal deformation performance and the wear resistance of the sealing element are improved. The used fillers comprise engineering resin and inorganic fillers, but due to different properties of materials, the materials are not pregnant when mixed, the cohesiveness of the materials is poor, the polymerization degree of the materials is reduced, and the wear resistance and the creep resistance are reduced. And the excessive addition of the filler can reduce the toughness of the material and influence the sealing effect. Therefore, the rotary sealing element prepared at the present stage is hard and short in service life; poor followability and oil leakage phenomenon; the friction between the sealing lip pieces is large, so that the air compressor is difficult to start or cannot be started.
In conclusion, the rotary sealing element for the air compressor is of great significance in solving the problems.
Disclosure of Invention
The present invention is directed to a rotary seal for an air compressor and a method for manufacturing the same, so as to solve the problems of the background art.
In order to solve the technical problems, the invention provides the following technical scheme:
a rotary sealing element for an air compressor comprises a stainless steel inner bone 1, a main sealing lip 2, a PTFE gasket 3, an auxiliary sealing lip 4, a dust lip 5 and a stainless steel outer bone 6, wherein the inner diameter and the outer diameter of the rotary sealing element are concentric;
the stainless steel inner bone 1 is embedded in the stainless steel outer bone 6 and fixed into a skeleton whole; the main seal lip 2, the PTFE gasket 3 and the auxiliary seal lip 4 are tightly embedded between the stainless steel inner bone 1 and the stainless steel outer bone 6, the main seal lip 2 supports against the inner wall of the stainless steel inner bone 1, and the dustproof lip supports against the inner wall of the stainless steel outer bone 6.
Preferably, the main sealing lip 2, the auxiliary sealing lip 4 and the dust-proof lip 5 are made of the same material and are all made of polytetrafluoroethylene mixture.
Preferably, the raw materials of the polytetrafluoroethylene mixture comprise the following components: 75-80 parts of modified polytetrafluoroethylene, 4-8 parts of polyimide, 4-8 parts of polyphenyl ester, 0.5-1 part of ethylene bis stearamide, 0.5-1 part of inorganic salt, 4-6 parts of flaky molybdenum disulfide and 6-8 parts of nano zinc oxide.
Preferably, the modified polytetrafluoroethylene is prepared by grafting 2-aminoethyl methacrylate onto suspended polytetrafluoroethylene resin; the particle size of the suspended polytetrafluoroethylene resin is 20-50 microns.
Preferably, the particle size of the nano zinc oxide is 20-60 nm; the particle size of the polyphenyl ester and the polyimide is 20-50 microns; the inorganic salt comprises one or more of ferrous sulfate, sodium carbonate, potassium carbonate and barium sulfate.
Preferably, the preparation method of the rotary sealing element for the air compressor comprises the following steps:
step 1: ultrasonically dispersing the nano zinc oxide in a sodium dodecyl benzene sulfonate solution, and freeze-drying to obtain nano zinc oxide A; placing the flaky molybdenum disulfide in a hexadecyl trimethyl ammonium bromide solution, stirring for 3-4 hours at the set temperature of 75-80 ℃, stirring for 20-24 hours at room temperature, washing and drying; transferring the mixture into a gamma-glycidyl ether oxypropyl trimethoxy silane solution, adjusting the pH value to 4-4.5, stirring at room temperature for 1-2 hours, and stirring at 75-80 ℃ for 10-12 hours; adding nano zinc oxide A at room temperature, stirring for 10-12 hours, washing and drying to obtain a filler A;
step 2: mixing modified polytetrafluoroethylene, polyimide, polyphenyl ester, ethylene bis stearamide, inorganic salt and filler A by using a high-speed mixer, and standing for 3-5 days to obtain a polytetrafluoroethylene mixture;
and step 3: loading the polytetrafluoroethylene mixture by using a mold, and placing the mixture on a hydraulic press for compression molding; transferring the mixture to a sintering furnace for sintering to obtain a semi-finished product;
and 4, step 4: turning the semi-finished product out of the main sealing lip 2, the auxiliary sealing lip 4 and the dust-proof lip 5 by using a numerical control lathe;
and 5: and (3) assembling the main sealing lip 2, the PTFE gasket 3, the auxiliary sealing lip 4 and the dust lip 5 between the stainless steel inner bone 1 and the stainless steel outer bone 6, and sizing by using a core rod to obtain the rotary sealing element.
Preferably, in the step 1, the mass ratio of the flaky molybdenum disulfide, the hexadecyl trimethyl ammonium bromide, the gamma-glycidyl ether oxygen propyl trimethoxy silane and the sodium dodecyl benzene sulfonate is 1 (0.3-0.4) to 0.8-1 and 0.3-0.4; the concentration of the sodium dodecyl benzene sulfonate solution is 10-12 wt%; the concentration of the hexadecyl trimethyl ammonium bromide solution is 10-12 wt%; the concentration of the gamma-glycidyl ether oxypropyltrimethoxysilane solution is 4-5 wt%.
Preferably, in step 2, the preparation method of the modified polytetrafluoroethylene comprises the following steps: dispersing the suspended polytetrafluoroethylene resin in 4-6 wt% of acrylic acid solution, adding 0.8-1.2 wt% of ferrous sulfate and 0.5-0.9 mol/L of sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing in Co-60 gamma rays at room temperature, and performing irradiation treatment at 0.5-1.0 kGy/h, wherein the total dose is 0.5-1 kGy; washing, filtering and drying, putting the mixture into 4-6 wt% of 2-aminoethyl methacrylate hydrochloride solution, adding 0.5-0.9 mol/L sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing the mixture in Co-60 gamma rays at room temperature, carrying out irradiation treatment at the rate of 0.5-1.0 kGy/h, wherein the total dose is 2-5 kGy, washing, filtering and drying to obtain the modified polytetrafluoroethylene.
Optimally, the solid-to-liquid ratio of the suspended polytetrafluoroethylene resin to the acrylic acid solution and the 2-aminoethyl methacrylate hydrochloride solution is 1g to 10 mL; the volume ratio of the sulfuric acid to the acrylic acid solution or the 2-aminoethyl methacrylate hydrochloride solution is 1: 0.2.
Preferably, in step 3, the press forming process is as follows: prepressing at 2-4 Mpa for 5-8 minutes, and pressing at 20-60 Mpa for 10-20 minutes; the sintering process is as follows: sintering at 360-385 ℃ for 2-5 hours.
In the technical scheme, polyimide and polyphenyl ester are used as organic fillers, flaky molybdenum disulfide and nano zinc oxide are used as inorganic fillers, and modified polytetrafluoroethylene is matched to prepare the rotary sealing element for the air compressor, which has the advantages of good wear resistance, high creep resistance and long service life and can meet the requirement of high linear speed use, and experiments show that the service life is up to 8 years.
(1) In the scheme, the suspension polytetrafluoroethylene resin is grafted with acrylic acid and 2-aminoethyl methacrylate sequentially under different irradiation doses; meanwhile, sulfuric acid is added in the grafting process, so that the grafting rate is improved. Generally, the main chain of the polytetrafluoroethylene does not contain hydrogen atoms, so that fewer grafting sites are generated in the grafting process, the grafting rate is low, and higher irradiation dose is usually needed; in the scheme, sulfuric acid is used for rendering the grafting environment acidic and increasing grafting sites; meanwhile, because the static repulsion between the acrylic acid and the carboxylic acid formed by oxidizing the surface of the polytetrafluoroethylene is also the reason for reducing the grafting rate, when the sulfuric acid is added, the ionization of the acrylic acid and the carboxylic acid is reduced, so that the repulsion acting force is reduced, and the grafting rate is increased. A small portion of the acrylic acid is grafted first, for better grafting of the 2-aminoethylmethacrylate, since the protonated amino groups can form ion pairs with the carboxylic acid, facilitating its grafting on the polytetrafluoroethylene chains, but not necessarily too much.
Compared with the traditional double-spiral chain of the polytetrafluoroethylene, the main chain of the modified polytetrafluoroethylene is grafted with lateral branches, so that the polymerization degree between molecular chains is enhanced; meanwhile, the amino group of the grafted 2-aminoethyl methacrylate can react with the epoxy group on the treated inorganic filler, so that the reaction compatibility is increased, and the cohesiveness among materials is increased, thereby remarkably improving the wear resistance, creep property and lubricity of the material, and solving the problem of poor followability on the aspect of reducing the friction coefficient.
(2) The inorganic filler in the scheme comprises flaky molybdenum disulfide and nano zinc oxide; molybdenum disulfide is a very excellent lubricant, which can further reduce the friction properties of the material; the problem of internal heat generation of the material can be solved by adding the nano zinc oxide, so that the temperature of the product is quickly reduced when the product runs at a high speed, and the wear resistance of the rotary sealing element is greatly enhanced. But the dispersibility of the inorganic filler and the compatibility of the polymer are key, in order to enhance the dispersibility and the compatibility of the inorganic filler, in the scheme, cetyl trimethyl ammonium bromide and gamma-glycidyl ether oxypropyl trimethoxy silicon are used for treating flaky molybdenum disulfide, sodium dodecyl benzene sulfonate is used for treating nano zinc oxide, and the nano zinc oxide is mixed to form the inorganic filler.
The surface of the molybdenum disulfide contains a sulfur-rich adsorption layer (with negative charges) which is electrostatically adsorbed with hexadecyl trimethyl ammonium bromide (with positive charges), the sheet surface is adsorbed, the dispersibility of the molybdenum disulfide among polymers is enhanced, and meanwhile, lipophilic groups in gamma-glycidyl ether oxypropyl trimethoxy silicon serving as a silane coupling agent are coupled with hydrophobic groups on the surface of the molybdenum disulfide, so that the material performance is enhanced through modification. Meanwhile, when the nano zinc oxide containing the anionic surfactant is intercalated between the flaky molybdenum disulfide layers with the cationic surfactant, the anions and the cations are compounded, so that the degradation temperature of the surface active molecules is increased; and the nano particles are inserted between the flaky molybdenum disulfide layers, so that the stacking of the flaky layers is inhibited after part of the surfactant is degraded. And sliding friction is formed between the flaky materials and the round particles in a matched manner, so that the wear resistance is further enhanced, and the creep resistance is synergistically improved. In addition, the grafted gamma-glycidyl ether oxypropyl trimethoxy silicon contains epoxy groups, and can be grafted with modified polytetrafluoroethylene at high temperature to enhance the performance.
(3) In the scheme, the polyphenyl ester and the polyimide are added as organic fillers, the friction coefficients of the two materials are low, and the dispersibility and the compatibility of the polyphenyl ester and the polyimide in the mixture are effectively enhanced through the modification of the inorganic fillers and the modification of the polytetrafluoroethylene, so that the cohesiveness among the raw materials is effectively improved, and the performance of the rotary sealing element is effectively improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is an exploded view of a rotary seal;
the figure is as follows: 1 stainless steel inner bone, 2 main seal lips, 3 PTFE gaskets, 4 auxiliary seal lips, 5 dust lips and 6 stainless steel outer bones.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
As shown in fig. 1, the rotary sealing element for the air compressor comprises a stainless steel inner bone 1, a main sealing lip 2, a PTFE gasket 3, an auxiliary sealing lip 4, a dust lip 5 and a stainless steel outer bone 6, and the inner diameter and the outer diameter of the rotary sealing element are concentric; the stainless steel inner bone 1 is embedded in the stainless steel outer bone 6 and fixed into a skeleton whole; the main seal lip 2, the PTFE gasket 3 and the auxiliary seal lip 4 are tightly embedded between the stainless steel inner bone 1 and the stainless steel outer bone 6, the main seal lip 2 supports against the inner wall of the stainless steel inner bone 1, and the dustproof lip supports against the inner wall of the stainless steel outer bone 6.
Example 1:
step 1: ultrasonically dispersing 7 parts of nano zinc oxide in 10 wt% of sodium dodecyl benzene sulfonate solution, and freeze-drying to obtain nano zinc oxide A; placing 5 parts of flaky molybdenum disulfide in 10 wt% of hexadecyl trimethyl ammonium bromide solution, stirring for 4 hours at the set temperature of 80 ℃, stirring for 24 hours at room temperature, washing and drying; transferring the mixture into a 5 wt% gamma-glycidoxypropyltrimethoxysilane solution, adjusting the pH to 4.2, stirring the mixture at room temperature for 1.5 hours, and stirring the mixture at the set temperature of 80 ℃ for 12 hours; adding nano zinc oxide A at room temperature, stirring for 12 hours, washing and drying to obtain a filler A;
step 2: (1) dispersing the suspended polytetrafluoroethylene resin in 5 wt% of acrylic acid solution, adding 1 wt% of ferrous sulfate and 0.6mol/L of sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing in Co-60 gamma rays at room temperature, and performing irradiation treatment at the total dose of 1 kGy/h; washing, filtering and drying, putting the mixture into 5 wt% 2-aminoethyl methacrylate hydrochloride solution, adding 0.6mol/L sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing the mixture in Co-60 gamma rays at room temperature, carrying out irradiation treatment at the total dose of 5kGy/h, washing, filtering and drying to obtain the modified polytetrafluoroethylene. (2) Mixing 78 parts of modified polytetrafluoroethylene, 6 parts of polyimide, 6 parts of polyphenyl ester, 0.8 part of ethylene bis stearamide, 0.7 part of inorganic salt and a filler A by using a high-speed mixer, and standing for 4 days to obtain a polytetrafluoroethylene mixture;
and step 3: loading the polytetrafluoroethylene mixture by using a mold, placing the mixture on a hydraulic press, prepressing the mixture at 4MPa for 5 minutes, pressing the mixture at 40MPa for 15 minutes, and forming; transferring the mixture to a sintering furnace, sintering the mixture for 4 hours at 375 ℃ to obtain a semi-finished product;
and 4, step 4: turning the semi-finished product out of the main sealing lip 2, the auxiliary sealing lip 4 and the dust-proof lip 5 by using a numerical control lathe;
and 5: and (3) assembling the main sealing lip 2, the PTFE gasket 3, the auxiliary sealing lip 4 and the dust lip 5 between the stainless steel inner bone 1 and the stainless steel outer bone 6, and sizing by using a core rod to obtain the rotary sealing element.
In the technical scheme, the particle size of the suspended polytetrafluoroethylene resin is 25 microns; the grain diameter of the nano zinc oxide is 35 nanometers; the particle size of the polybenzoate is 25 microns; the particle size of the polyimide is 25 microns; the inorganic salt comprises one or more of ferrous sulfate, sodium carbonate, potassium carbonate and barium sulfate. Wherein the mass ratio of the flaky molybdenum disulfide to the hexadecyl trimethyl ammonium bromide to the gamma-glycidyl ether oxypropyl trimethoxy silane to the sodium dodecyl benzene sulfonate is 1:0.35:1: 0.35; the solid-to-liquid ratio of the suspended polytetrafluoroethylene resin to the acrylic acid solution and the 2-aminoethyl methacrylate hydrochloride solution is 1g to 10 mL; the volume ratio of the sulfuric acid to the acrylic acid solution or the 2-aminoethyl methacrylate hydrochloride solution is 1: 0.2.
Example 2:
step 1: ultrasonically dispersing 6 parts of nano zinc oxide in 10 wt% of sodium dodecyl benzene sulfonate solution, and freeze-drying to obtain nano zinc oxide A; placing 4 parts of flaky molybdenum disulfide in 10 wt% of hexadecyl trimethyl ammonium bromide solution, stirring for 4 hours at the temperature of 75 ℃, stirring for 20 hours at room temperature, washing and drying; transferring the mixture into a 5 wt% gamma-glycidoxypropyltrimethoxysilane solution, adjusting the pH to 4, stirring the mixture at room temperature for 2 hours, and stirring the mixture at the set temperature of 75 ℃ for 12 hours; adding nano zinc oxide A at room temperature, stirring for 10 hours, washing and drying to obtain a filler A;
step 2: (1) dispersing the suspended polytetrafluoroethylene resin in 4 wt% of acrylic acid solution, adding 0.8 wt% of ferrous sulfate and 0.5mol/L of sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing in Co-60 gamma rays at room temperature, and performing irradiation treatment at 0.50kGy/h to obtain a total dose of 0.5 kGy; washing, filtering and drying, putting the mixture into 4 wt% 2-aminoethyl methacrylate hydrochloride solution, adding 0.5mol/L sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing the mixture in Co-60 gamma rays at room temperature, carrying out irradiation treatment at the rate of 0.5kGy/h, wherein the total dose is 2kGy, washing, filtering and drying to obtain the modified polytetrafluoroethylene. (2) Mixing 75 parts of modified polytetrafluoroethylene, 4 parts of polyimide, 4 parts of polyphenyl ester, 0.5 part of ethylene bis stearamide, 0.5 part of inorganic salt and a filler A by using a high-speed mixer, and standing for 3 days to obtain a polytetrafluoroethylene mixture;
and step 3: loading the polytetrafluoroethylene mixture by using a mold, placing the mixture on a hydraulic press, prepressing the mixture at 4MPa for 5 minutes, pressing the mixture at 60MPa for 10 minutes, and forming; transferring the mixture to a sintering furnace, sintering the mixture for 5 hours at 360 ℃ to obtain a semi-finished product;
and 4, step 4: turning the semi-finished product out of the main sealing lip 2, the auxiliary sealing lip 4 and the dust-proof lip 5 by using a numerical control lathe;
and 5: and (3) assembling the main sealing lip 2, the PTFE gasket 3, the auxiliary sealing lip 4 and the dust lip 5 between the stainless steel inner bone 1 and the stainless steel outer bone 6, and sizing by using a core rod to obtain the rotary sealing element.
In the technical scheme, the particle size of the suspended polytetrafluoroethylene resin is 20 microns; the grain diameter of the nano zinc oxide is 20 nanometers; the particle size of the polyphenyl ester is 20 microns; the particle size of the polyimide is 20 microns; the inorganic salt comprises one or more of ferrous sulfate, sodium carbonate, potassium carbonate and barium sulfate. Wherein the mass ratio of the flaky molybdenum disulfide to the hexadecyl trimethyl ammonium bromide to the gamma-glycidyl ether oxypropyl trimethoxy silane to the sodium dodecyl benzene sulfonate is 1:0.3:0.8: 0.3; the solid-to-liquid ratio of the suspended polytetrafluoroethylene resin to the acrylic acid solution and the 2-aminoethyl methacrylate hydrochloride solution is 1g to 10 mL; the volume ratio of the sulfuric acid to the acrylic acid solution or the 2-aminoethyl methacrylate hydrochloride solution is 1: 0.2.
Example 3:
step 1: ultrasonically dispersing 8 parts of nano zinc oxide in 12 wt% of sodium dodecyl benzene sulfonate solution, and freeze-drying to obtain nano zinc oxide A; placing 6 parts of flaky molybdenum disulfide in 12 wt% of hexadecyl trimethyl ammonium bromide solution, stirring for 3 hours at the set temperature of 80 ℃, stirring for 20-24 hours at room temperature, washing and drying; transferring the mixture into a 4 wt% gamma-glycidoxypropyltrimethoxysilane solution, adjusting the pH to 4.5, stirring the mixture at room temperature for 1 hour, and stirring the mixture at the set temperature of 80 ℃ for 10 hours; adding nano zinc oxide A at room temperature, stirring for 12 hours, washing and drying to obtain a filler A;
step 2: (1) dispersing the suspended polytetrafluoroethylene resin in 6 wt% of acrylic acid solution, adding 1.2 wt% of ferrous sulfate and 0.9mol/L of sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing in Co-60 gamma rays at room temperature, and performing irradiation treatment at 1.0kGy/h to obtain a total dose of 1 kGy; washing, filtering and drying, putting the mixture into 6 wt% 2-aminoethyl methacrylate hydrochloride solution, adding 0.9mol/L sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing the mixture in Co-60 gamma rays at room temperature, carrying out irradiation treatment at 1.0kGy/h with the total dose of 5kGy, washing, filtering and drying to obtain the modified polytetrafluoroethylene. (2) Mixing 80 parts of modified polytetrafluoroethylene, 8 parts of polyimide, 8 parts of polyphenyl ester, 1 part of ethylene bis stearamide, 1 part of inorganic salt and filler A by using a high-speed mixer, and standing for 3-5 days to obtain a polytetrafluoroethylene mixture;
and step 3: loading the polytetrafluoroethylene mixture by using a mold, placing the mixture on a hydraulic press, prepressing the mixture for 8 minutes at 2MPa, pressing the mixture for 20 minutes at 20MPa, and forming; transferring the mixture to a sintering furnace to sinter the mixture for 2 hours at 385 ℃ to obtain a semi-finished product;
and 4, step 4: turning the semi-finished product out of the main sealing lip 2, the auxiliary sealing lip 4 and the dust-proof lip 5 by using a numerical control lathe;
and 5: and (3) assembling the main sealing lip 2, the PTFE gasket 3, the auxiliary sealing lip 4 and the dust lip 5 between the stainless steel inner bone 1 and the stainless steel outer bone 6, and sizing by using a core rod to obtain the rotary sealing element.
In the technical scheme, the particle size of the suspended polytetrafluoroethylene resin is 50 microns; the grain diameter of the nano zinc oxide is 60 nanometers; the particle size of the polyphenyl ester is 50 microns; the particle size of the polyimide is 50 microns; the inorganic salt comprises one or more of ferrous sulfate, sodium carbonate, potassium carbonate and barium sulfate. Wherein the mass ratio of the flaky molybdenum disulfide to the hexadecyl trimethyl ammonium bromide to the gamma-glycidyl ether oxypropyl trimethoxy silane to the sodium dodecyl benzene sulfonate is 1:0.4:1: 0.4; the solid-to-liquid ratio of the suspended polytetrafluoroethylene resin to the acrylic acid solution and the 2-aminoethyl methacrylate hydrochloride solution is 1g to 10 mL; the volume ratio of the sulfuric acid to the acrylic acid solution or the 2-aminoethyl methacrylate hydrochloride solution is 1: 0.2.
Comparative example 1: the nano zinc oxide was not modified with sodium dodecylbenzenesulfonate, and the rest was the same as in example 1.
Comparative example 2: the same procedure as in example 1 was repeated except that the molybdenum disulfide pellet was used instead of the molybdenum disulfide pellet.
Comparative example 3: the flaky molybdenum disulfide was modified without using gamma-glycidoxypropyltrimethoxysilane, and the procedure was as in example 1.
Comparative example 4: the suspension polytetrafluoroethylene resin was used without modification, and the rest was the same as in example 1.
Comparative example 5: the same procedure as in example 1 was repeated except that sulfuric acid was not added in the process of modifying polytetrafluoroethylene.
Comparative example 6: the modified polytetrafluoroethylene was not grafted with acrylic acid, and the procedure was the same as in example 1.
Comparative example 7: the modified polytetrafluoroethylene was not grafted with 2-aminoethyl methacrylate, but the procedure was the same as in example 1.
Comparative example 8: the total dose of grafted acrylic acid during the modified polytetrafluoroethylene was 2kGy, the rest being the same as in example 1.
Experiment: taking the semi-finished products prepared in the embodiment and the comparative example for carrying out related performance tests, detecting the tensile strength according to GB/T1040.2-2006, and detecting the dynamic friction coefficient under the load of 200N and 0.45m/s multiplied by 60min according to GB/T3960-2016; the creep rate after 24 hours was recorded according to ASTM D621 at a temperature of 23 ℃ and a stress of 23 MPa. The results obtained are shown in the following table:
| examples | Tensile strength/MPa | Compressive creep rate/%) | Coefficient of dynamic friction |
| Example 1 | 27.3 | 0.84 | 0.152 |
| Example 2 | 26.8 | 0.89 | 0.160 |
| Example 3 | 26.6 | 0.92 | 0.163 |
| Comparative example 1 | 25.3 | 0.95 | 0.168 |
| Comparative example 2 | 25.6 | 0.93 | 0.164 |
| Comparative example 3 | 25.2 | 0.97 | 0.171 |
| Comparative example 4 | 22.8 | 1.61 | 0.201 |
| Comparative example 5 | 23.9 | 1.43 | 0.192 |
| Comparative example 6 | 25.3 | 1.25 | 0.186 |
| Comparative example 7 | 24.7 | 1.19 | 0.189 |
| Comparative example 8 | 26.5 | 1.03 | 0.179 |
And (4) conclusion: the data in the table above show that the semifinished products prepared have good mechanical properties, creep resistance and abrasion resistance. The coefficient of dynamic friction is as low as 0.152, and the creep rate is as low as 0.84%.
Comparing the data of comparative examples 1-3 with the data of example 1, it can be found that: in the comparative example 1, the acting force of the nano zinc oxide inserted between the flaky molybdenum disulfide layers is reduced because the nano zinc oxide is not modified by using the anionic surfactant; and no acting force exists between the anions and the cations, so that the wear resistance and the creep resistance are reduced. In comparative example 2, since the molybdenum disulfide particles are round, the coordination with the round nano zinc oxide shape is reduced, and at the same time, the grafting ratio of the molybdenum disulfide particle surface modification is reduced, so that the interaction with other materials is reduced, and therefore the performance is reduced. In comparative example 3, the flaky molybdenum disulfide was not modified with gamma-glycidoxypropyltrimethoxysilane, and the creep resistance and toughness were reduced without reaction with modified polytetrafluoroethylene.
Comparing the data in comparative examples 4-8 with the data of example 1, it can be found that: comparative example 4, in which polytetrafluoroethylene was not used, showed a significant reduction in performance in the more respects. Comparative example 5 the performance was degraded; the performance drops in comparative examples 6 and 7 are again the least, and in comparative example 8. The reason is that: the side grafting affects the degree of polymerization between molecular chains and the compatibility of the reaction with the filler. Thereby affecting performance. In contrast, the branch chain is not existed in the comparative example 4, the reduction is maximum, and the sulfuric acid is not added in the comparative example 5, so that the grafting rate is reduced; in contrast, in comparative examples 6 and 7, one of the substances was not grafted, which reduced reactivity and compatibility; in comparative example 8, since the total dose of acrylic acid was 2kGy, the graft sites occupied by acrylic acid were excessive, affecting the grafting of 2-aminoethyl methacrylate, decreasing the reactivity with the filler. Therefore, the product performance in the proportion of 4-8 is reduced.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a rotary seal spare for air compressor which characterized in that: the rotary sealing element comprises a stainless steel inner bone (1), a main sealing lip (2), a PTFE gasket (3), an auxiliary sealing lip (4), a dust lip (5) and a stainless steel outer bone (6), and the inner diameter and the outer diameter of the rotary sealing element are concentric;
the stainless steel inner bone (1) is embedded in the stainless steel outer bone (6) and fixed into a skeleton whole; the main sealing lip (2), the PTFE gasket (3) and the auxiliary sealing lip (4) are tightly embedded between the stainless steel inner bone (1) and the stainless steel outer bone (6), the main sealing lip (2) is abutted against the inner wall of the stainless steel inner bone (1), and the dust-proof lip is abutted against the inner wall of the stainless steel outer bone (6);
the main sealing lip (2), the auxiliary sealing lip (4) and the dust-proof lip (5) are made of the same material and are all made of polytetrafluoroethylene mixture;
the polytetrafluoroethylene mixture comprises the following raw materials: 75-80 parts of modified polytetrafluoroethylene, 4-8 parts of polyimide, 4-8 parts of polyphenyl ester, 0.5-1 part of ethylene bis stearamide, 0.5-1 part of inorganic salt, 4-6 parts of flaky molybdenum disulfide and 6-8 parts of nano zinc oxide.
2. The rotary seal for an air compressor according to claim 1, wherein: the modified polytetrafluoroethylene is prepared by grafting 2-aminoethyl methacrylate onto suspended polytetrafluoroethylene resin; the particle size of the suspended polytetrafluoroethylene resin is 20-50 microns.
3. The rotary seal for an air compressor according to claim 1, wherein: the particle size of the nano zinc oxide is 20-60 nanometers; the particle size of the polyphenyl ester and the polyimide is 20-50 microns; the inorganic salt comprises one or more of ferrous sulfate, sodium carbonate, potassium carbonate and barium sulfate.
4. A preparation method of a rotary sealing element for an air compressor is characterized by comprising the following steps: the method comprises the following steps:
step 1: ultrasonically dispersing the nano zinc oxide in a sodium dodecyl benzene sulfonate solution, and freeze-drying to obtain nano zinc oxide A; placing the flaky molybdenum disulfide in a hexadecyl trimethyl ammonium bromide solution, stirring for 3-4 hours at the set temperature of 75-80 ℃, stirring for 20-24 hours at room temperature, washing, drying, transferring to a gamma-glycidyl ether oxypropyl trimethoxysilane solution, adjusting the pH to 4-4.5, stirring for 1-2 hours at room temperature, and stirring for 10-12 hours at the set temperature of 75-80 ℃; adding nano zinc oxide A at room temperature, stirring for 10-12 hours, washing and drying to obtain a filler A;
and 2, step: mixing modified polytetrafluoroethylene, polyimide, polyphenyl ester, ethylene bis stearamide, inorganic salt and filler A by using a high-speed mixer, and standing for 3-5 days to obtain a polytetrafluoroethylene mixture;
and step 3: loading the polytetrafluoroethylene mixture by using a mold, and placing the mixture on a hydraulic press for compression molding; transferring the mixture to a sintering furnace for sintering to obtain a semi-finished product;
and 4, step 4: turning the semi-finished product out of the main sealing lip (2), the auxiliary sealing lip (4) and the dust-proof lip (5) by using a numerical control lathe;
and 5: and (3) assembling the main sealing lip (2), the PTFE gasket (3), the auxiliary sealing lip (4) and the dust lip (5) between the stainless steel inner framework (1) and the stainless steel outer framework (6), and sizing by using a core rod to obtain the rotary sealing element.
5. The method for manufacturing a rotary seal for an air compressor according to claim 4, wherein: in the step 1, the mass ratio of the flaky molybdenum disulfide, the hexadecyl trimethyl ammonium bromide, the gamma-glycidyl ether oxypropyl trimethoxy silane and the sodium dodecyl benzene sulfonate is 1 (0.3-0.4) to 0.8-1 (0.3-0.4); the concentration of the sodium dodecyl benzene sulfonate solution is 10-12 wt%; the concentration of the hexadecyl trimethyl ammonium bromide solution is 10-12 wt%; the concentration of the gamma-glycidyl ether oxypropyltrimethoxysilane solution is 4-5 wt%.
6. The method for manufacturing a rotary seal for an air compressor according to claim 4, wherein: in step 2, the preparation method of the modified polytetrafluoroethylene comprises the following steps: dispersing the suspended polytetrafluoroethylene resin in 4-6 wt% of acrylic acid solution, adding 0.8-1.2 wt% of ferrous sulfate and 0.5-0.9 mol/L of sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing in Co-60 gamma rays at room temperature, and performing irradiation treatment at 0.5-1.0 kGy/h, wherein the total dose is 0.5-1 kGy; washing, filtering and drying, putting the mixture into 4-6 wt% of 2-aminoethyl methacrylate hydrochloride solution, adding 0.5-0.9 mol/L sulfuric acid, introducing nitrogen to remove oxygen, sealing, placing the mixture in Co-60 gamma rays at room temperature, carrying out irradiation treatment at the rate of 0.5-1.0 kGy/h, wherein the total dose is 2-5 kGy, washing, filtering and drying to obtain the modified polytetrafluoroethylene.
7. The method for manufacturing a rotary seal for an air compressor according to claim 6, wherein: the solid-to-liquid ratio of the suspended polytetrafluoroethylene resin to the acrylic acid solution and the 2-aminoethyl methacrylate hydrochloride solution is 1g to 10 mL; the volume ratio of sulfuric acid to acrylic acid solution or 2-aminoethyl methacrylate hydrochloride solution was 1: 0.2.
8. The method for manufacturing a rotary seal for an air compressor as claimed in claim 4, wherein: in step 3, the compression molding process comprises: prepressing at 2-4 Mpa for 5-8 minutes, and pressing at 20-60 Mpa for 10-20 minutes; the sintering process is as follows: sintering at 360-385 ℃ for 2-5 hours.
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| CN105008775A (en) * | 2013-02-27 | 2015-10-28 | 株式会社小松制作所 | Oil seal |
| CN207470776U (en) * | 2017-11-24 | 2018-06-08 | 宁波美豪汽车部件有限公司 | A kind of polytetrafluoroethylene (PTFE) lip-type packing of Multi-medium sealing |
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|---|---|---|---|---|
| DE3601349A1 (en) * | 1986-01-18 | 1987-07-23 | Goetze Ag | Lip seal ring |
| JPH06129547A (en) * | 1992-10-21 | 1994-05-10 | Mitsubishi Cable Ind Ltd | Seal for rotation |
| JPH07243534A (en) * | 1994-03-07 | 1995-09-19 | Nok Corp | Sealing device and its manufacture |
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Denomination of invention: A rotary seal for air compressors and its preparation method Effective date of registration: 20230620 Granted publication date: 20220805 Pledgee: Enping Sub branch of China Guangfa Bank Bank Pledgor: JIANGMEN GELEIYATE FLUID SEALING TECHNOLOGY Co.,Ltd. Registration number: Y2023980044845 |
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Granted publication date: 20220805 Pledgee: Enping Sub branch of China Guangfa Bank Bank Pledgor: JIANGMEN GELEIYATE FLUID SEALING TECHNOLOGY Co.,Ltd. Registration number: Y2023980044845 |