CN108976676A - A kind of dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve and its processing technology - Google Patents
A kind of dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve and its processing technology Download PDFInfo
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- CN108976676A CN108976676A CN201810863548.7A CN201810863548A CN108976676A CN 108976676 A CN108976676 A CN 108976676A CN 201810863548 A CN201810863548 A CN 201810863548A CN 108976676 A CN108976676 A CN 108976676A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seat
- F16K25/005—Particular materials for seats or closure elements
-
- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- 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
- C08K2003/3045—Sulfates
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- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a kind of dedicated polytetrafluoroethylene (PTFE) of valve to fill polyparaphenylene sealing ring, the sealing ring includes following components by mass percentage: polytetrafluoroethylene (PTFE) 65-70%, high temperature resistant filler: 18-20%, wear-resistant material: 8-11%, graphite 2-5%, high temperature resistant filler are polyparaphenylene；Polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；Wear-resistant material is the glass fibre of 300 mesh or more；Graphite is No. 0 graphite of 300 mesh or more；The present invention also designs a kind of processing technology of dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve, and the processing technology is simple and easy, and the polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring processed has excellent performance, and product quality temperature is good in economic efficiency.
Description
Technical field
The present invention relates to a kind of sealing ring and its processing technologys, and in particular to a kind of dedicated polytetrafluoroethylene (PTFE) filling pair of valve
Position polyphenyl sealing ring and its processing technology.
Background technique
Valve is the control unit in fluid delivery system, has cut-off, adjusting, water conservancy diversion, prevents adverse current, pressure stabilizing, shunting
Or the functions such as overflow pressure relief, the leakproofness of valve play an important role in use, the use of sealing ring is even more important, close
The selection of seal material directly affects making for sealing ring to its sealing performance and service life important in inhibiting, the performance of material
Use performance；
The creep effect that the teflin ring of any packing material is not added is good, but in 200 DEG C or more of hot environment
It will deform, poor sealing effect, abrasion resistant effect is poor, and leakage, which will occur, for valve leads to the generation of accident, it is necessary to often replacement
Sealing ring even replaces valve, has brought tremendous economic losses to client and security risk, is to solve four under worst hot case
The service life and abrasion resistant effect of fluorine sealing ring, researching and developing the novel polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of one kind becomes this
Field technical staff technical problem urgently to be resolved.
Summary of the invention
The technical problem to be solved by the present invention is to propose that a kind of valve is special for the above disadvantage of the existing technology
Polyparaphenylene sealing ring and its processing technology are filled with polytetrafluoroethylene (PTFE), the processing technology is simple and easy, the polytetrafluoro processed
Ethylene, which fills polyparaphenylene sealing ring, has excellent performance, and product quality temperature is good in economic efficiency.
The technical solution that the present invention solves the above technical problem is:
A kind of dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve, which includes with the following group by mass percentage
Point: polytetrafluoroethylene (PTFE) 65-70%, high temperature resistant filler: 18-20%, wear-resistant material: 8-11%, graphite 2-5%, in which:
High temperature resistant filler is polyparaphenylene；Polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；Wear-resistant material is 300 mesh
Above glass fibre；Graphite is No. 0 graphite of 300 mesh or more.
The present invention also designs a kind of dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve, which presses quality hundred
Dividing than meter includes following components: polytetrafluoroethylene (PTFE) 65-70%, high temperature resistant filler: 18-20%, wear-resistant material: 8-11%, graphite 2-
5%, in which:
High temperature resistant filler is the mixture of polyparaphenylene, aluminium oxide, mica powder, size and compounded lubricant, wherein pressing quality
Than counting polyparaphenylene: aluminium oxide: mica powder: modified montmorillonoid: size: composite lubricated=2:3:1:1:1:1；
Size is trimethoxy silane, and compounded lubricant is the equal proportion mixture of molybdenum disulfide and oleic acid isooctanol ester；
Polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；
Wear-resistant material is the mixture of glass fibre, potassium peroxydisulfate, yttrium oxide, titanium carbide and zirconium boride, wherein is counted in mass ratio
Glass fibre: potassium peroxydisulfate: yttrium oxide: titanium carbide: zirconium boride=3:2:1:1:1；
Glass fibre is the glass fibre of 300 mesh or more；
Graphite is No. 0 graphite of 300 mesh or more.
The technical solution that the present invention further limits are as follows:
In the dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of said valve, the preparation method of high temperature resistant filler is specific as follows:
(1) polyparaphenylene is sent and is warming up to 120 DEG C into kneader；
(2) aluminium oxide is added in kneader, stirs 10-20min, mica powder, modified montmorillonoid and composite lubricated is then added
Agent, adjusting revolving speed is 400-500 revs/min, stirs 10-13min, and be filled with nitrogen protection；
(3) mixed material that step (2) obtains is put into baking oven at 70 DEG C and dries 1h, then be warming up to 80 DEG C, dry 2h, after
It is continuous to be warming up to 90 DEG C of drying 3h, finally it is warming up to 100 DEG C of drying 1h；
(3) material after drying is immersed in size 1-2 days, takes out air-dried 3 days, obtains high temperature resistant filler.
In the dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of said valve, modified montmorillonoid uses following technique system
It is standby:
Nano montmorillonite, maleic anhydride, benzoyl peroxide, ethyl alcohol are uniformly mixed, are heated to 80-82 DEG C, be filtered, washed,
It is dry, acetone, sodium hydroxide and carbinol mixture is then added and is uniformly mixed, is filtered, washed and dries again, first is then added
Benzene, Brij-721, phthalic acid, p-methyl benzenesulfonic acid are warming up to 75-80 DEG C, stir 20min, then heat to
90-100 DEG C of stirring 30min is added dipentaerythritol and toluene stirring, heats up 150-160 DEG C, stir evenly, cool down after cooling
Cooling obtains modified montmorillonoid afterwards.
The present invention also designs the processing technology of the dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of above-mentioned valve, specific to wrap
Include following steps:
(1) by polytetrafluoroethylene (PTFE), high temperature resistant filler, wear-resistant material, 3min is mixed in graphite, then by mixture input air flow
Pulverizer mixed at high speed 5 minutes, until being cmpletely uniformly mixed, finally in sieving machine impurity screening；
(2) mold is carried out after step (1) treated mixture is stored 12 hours to suppress to obtain sealing ring material；
(3) sealing ring material proper alignment is warming up in baking oven 200 DEG C and keeps the temperature 2 hours, be warming up to 250 DEG C and keep the temperature 2 hours,
It is warming up to 375 DEG C and keeps the temperature 4 hours, then natural cooling；
(4) 180 DEG C of investment molds are naturally cooled to and answer repoussage shape, valve can be obtained in the dwell time 3 minutes in press pressure 15Mpa
The dedicated polytetrafluoroethylene (PTFE) of door fills polyparaphenylene sealing ring.
In the processing technology of the dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of said valve, the compacting of step (2) mold
When specifically:
Vulcanized using vulcanizing press, the adjusting gauge pressure for setting vulcanizing press keeps 120kgf/cm2, vulcanizing press
The control of upper plate temperature at 170 DEG C, lower plate temperatures are controlled at 180 DEG C, are vented 2 times in sulfidation, are made in the case where adjusting gauge pressure
Compression molding molding vulcanization 7min, is then opened, demoulds molding mixture, be cooled and shaped sealing ring material.
The beneficial effects of the present invention are:
Filler use scope in the present invention is wider, using the working environment of some high temperature, is since material cause itself rubs
Number is small and the oil dress substance precipitation of lubrication is had under certain temperature adjusting, further decreases coefficient of friction, reduces the production of heat
It is raw；
The present invention improves the heat resistance of tetrafluoro product, thermal stability passes through by adding different heat resistant and wear resistant materials
Change the mesh number of filler to improve the compactness of product, improve the wear-resisting property of product, by laboratory research and development many times and
Trial-production, final determine select polyparaphenylene as high temperature resistant filler, and glass fibre is as wear-resistant material.
It joined the so-called reinforcing material of modified nano montmorillonite, resistance to permanent compression set, heat-resisting sky in filler of the invention
Gas ageing properties are as excellent, bearing capacity which, can guarantee it is highly filled under the premise of, make gained sealing ring elasticity it is preferable；
In the preparation process of modified nano montmorillonite, since nano montmorillonite is multilayered structure, after maleic anhydride hydrolysis generates acid anhydrides salt
It is cooperateed with styrene and organo montmorillonite is removed, improved dispersibility of the nano montmorillonite in ethanol solution, avoid receiving
The dipentaerythritol that rice montmorillonite is reunited, and is added cooperates with fatty alcohol polyoxyethylene ether, Brij-721, no
Only emulsification, wetting, dispersion effect are fabulous, and can organically combine with treated nano montmorillonite, not only have good
Dispersion, emulsification, lubrication and characteristic of solubilizing, with tetrapropanate fluorine rubber, ethylene propylene diene rubber, polyether urethanes, isoprene
The compatibility of rubber is fabulous, keeps gained sealing ring bearing capacity extremely excellent, moreover it is possible to improve gained sealing ring compression resistant and permanently become
Shape and thermal aging property；Fatty alcohol polyoxyethylene ether in modified nano montmorillonite, unreacted on Brij-721
Complete hydrophilic and oleophilic alcohol group and triphenyl phosphate, dibutyl phthalate, combination, triphenyl phosphate, phthalic acid
After the pluggable removing of dibutyl ester, disproportionated rosin between organo montmorillonite lamella and substrate molecule chain, intermolecular work can be not only slackened
Firmly, increase between tetrapropanate fluorine rubber, ethylene propylene diene rubber, polyether urethanes, isoprene rubber and remaining raw material
Mixing uniformity further enhances gained sealing ring pressure resistance compression permanent deformation, thermal aging property, and bearing capacity is excellent,
And can act synergistically with anti-aging agent, further increase gained sealing ring heat-resistant air aging property.
The diversity of filler and the diversity of wear-resistant material, are combined, and can maximize favourable factors and minimize unfavourable ones, and increase filler and wear-resisting material
The greatest benefit of material, single material cannot overcome multi-faceted defect, and the present invention is by adjusting product formula and processing technology
Improve the performance of product, improve product hardness, reduces compression set ratio, extend the service life of product.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of dedicated polytetrafluoroethylene (PTFE) of valve to fill polyparaphenylene sealing ring, and the sealing ring is by mass percentage
Meter includes following components: polytetrafluoroethylene (PTFE) 65%, high temperature resistant filler: 20%, wear-resistant material 10%, and graphite 5%, in which: high temperature resistant is filled out
Material is polyparaphenylene；Polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；Wear-resistant material is the glass fibers of 300 mesh or more
Dimension；Graphite is No. 0 graphite of 300 mesh or more.
The processing technology of the above-mentioned dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve, specifically includes the following steps:
(1) by polytetrafluoroethylene (PTFE), high temperature resistant filler, wear-resistant material, 3min is mixed in graphite, then by mixture input air flow
Pulverizer mixed at high speed 5 minutes, until being cmpletely uniformly mixed, finally in sieving machine impurity screening；
(2) mold is carried out after step (1) treated mixture is stored 12 hours to suppress to obtain sealing ring material；
(3) sealing ring material proper alignment is warming up in baking oven 200 DEG C and keeps the temperature 2 hours, be warming up to 250 DEG C and keep the temperature 2 hours,
It is warming up to 375 DEG C and keeps the temperature 4 hours, then natural cooling；
(4) 180 DEG C of investment molds are naturally cooled to and answer repoussage shape, valve can be obtained in the dwell time 3 minutes in press pressure 15Mpa
The dedicated polytetrafluoroethylene (PTFE) of door fills polyparaphenylene sealing ring.
In the present embodiment, when step (2) mold is suppressed specifically:
Vulcanized using vulcanizing press, the adjusting gauge pressure for setting vulcanizing press keeps 120kgf/cm2, vulcanizing press
The control of upper plate temperature at 170 DEG C, lower plate temperatures are controlled at 180 DEG C, are vented 2 times in sulfidation, are made in the case where adjusting gauge pressure
Compression molding molding vulcanization 7min, is then opened, demoulds molding mixture, be cooled and shaped sealing ring material.
The present invention is improved according to existing tetrafluoro formula, by adding different heat resistant and wear resistant materials, improves four
The heat resistance of fluorine product, thermal stability improve the compactness of product by changing the mesh number of filler, improve the resistance to of product
Performance is ground, is researched and developed by laboratory many times and trial-production, final determine selects polyparaphenylene as high temperature resistant filler, glass fibers
Dimension is used as wear-resistant material.Determining end formulation are as follows: more than 500 mesh of polytetrafluoroethylene (PTFE) 65%(fines), polyparaphenylene 20%, glass
It is more than fiber 10%(300 mesh), more than No. 0 graphite 5%(300 mesh).
Modified Teflon sealing ring is made through laboratory testing and client by the improvement of formula and the optimization of technique
It is on probation, it works well, concrete outcome are as follows: in the product not creep of sample 72 hours of 260 DEG C of ageing oven, client is in valve test bed company
There is no leakage, sealing effect and abrasion resistant effect are good within 1000 hours for continuous work.The research and development of product achieve success, reach
Expected effect.
Embodiment 2
The present embodiment provides a kind of dedicated polytetrafluoroethylene (PTFE) of valve to fill polyparaphenylene sealing ring, and the sealing ring is by mass percentage
Meter includes following components: polytetrafluoroethylene (PTFE) 68%, high temperature resistant filler: 19%, wear-resistant material 11%, and graphite 2%, in which: high temperature resistant is filled out
Material is polyparaphenylene；Polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；Wear-resistant material is the glass fibers of 300 mesh or more
Dimension；Graphite is No. 0 graphite of 300 mesh or more.
The processing technology of the above-mentioned dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve, specifically includes the following steps:
(1) by polytetrafluoroethylene (PTFE), high temperature resistant filler, wear-resistant material, 3min is mixed in graphite, then by mixture input air flow
Pulverizer mixed at high speed 5 minutes, until being cmpletely uniformly mixed, finally in sieving machine impurity screening；
(2) mold is carried out after step (1) treated mixture is stored 12 hours to suppress to obtain sealing ring material；
(3) sealing ring material proper alignment is warming up in baking oven 200 DEG C and keeps the temperature 2 hours, be warming up to 250 DEG C and keep the temperature 2 hours,
It is warming up to 375 DEG C and keeps the temperature 4 hours, then natural cooling；
(4) 180 DEG C of investment molds are naturally cooled to and answer repoussage shape, valve can be obtained in the dwell time 3 minutes in press pressure 15Mpa
The dedicated polytetrafluoroethylene (PTFE) of door fills polyparaphenylene sealing ring.
In the present embodiment, when step (2) mold is suppressed specifically:
Vulcanized using vulcanizing press, the adjusting gauge pressure for setting vulcanizing press keeps 120kgf/cm2, vulcanizing press
The control of upper plate temperature at 170 DEG C, lower plate temperatures are controlled at 180 DEG C, are vented 2 times in sulfidation, are made in the case where adjusting gauge pressure
Compression molding molding vulcanization 7min, is then opened, demoulds molding mixture, be cooled and shaped sealing ring material.
Embodiment 3
The present embodiment provides a kind of dedicated polytetrafluoroethylene (PTFE) of valve to fill polyparaphenylene sealing ring, and the sealing ring is by mass percentage
Meter includes following components: polytetrafluoroethylene (PTFE) 70%, high temperature resistant filler: 18%, wear-resistant material: and 8%, graphite 4%, in which:
High temperature resistant filler is the mixture of polyparaphenylene, aluminium oxide, mica powder, size and compounded lubricant, wherein pressing quality
Than counting polyparaphenylene: aluminium oxide: mica powder: modified montmorillonoid: size: composite lubricated=2:3:1:1:1:1；
Size is trimethoxy silane, and compounded lubricant is the equal proportion mixture of molybdenum disulfide and oleic acid isooctanol ester；
Polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；
Wear-resistant material is the mixture of glass fibre, potassium peroxydisulfate, yttrium oxide, titanium carbide and zirconium boride, wherein is counted in mass ratio
Glass fibre: potassium peroxydisulfate: yttrium oxide: titanium carbide: zirconium boride=3:2:1:1:1；
Glass fibre is the glass fibre of 300 mesh or more；
Graphite is No. 0 graphite of 300 mesh or more.
The preparation method of above-mentioned high temperature resistant filler is specific as follows:
(1) polyparaphenylene is sent and is warming up to 120 DEG C into kneader；
(2) aluminium oxide is added in kneader, stirs 20min, mica powder, modified montmorillonoid and compounded lubricant is then added,
Adjusting revolving speed is 500 revs/min, stirs 13min, and be filled with nitrogen protection；
(3) mixed material that step (2) obtains is put into baking oven at 70 DEG C and dries 1h, then be warming up to 80 DEG C, dry 2h, after
It is continuous to be warming up to 90 DEG C of drying 3h, finally it is warming up to 100 DEG C of drying 1h；
(3) material after drying is immersed in size 2 days, takes out air-dried 3 days, obtains high temperature resistant filler.
Above-mentioned modified montmorillonoid is prepared using following technique:
Nano montmorillonite, maleic anhydride, benzoyl peroxide, ethyl alcohol are uniformly mixed, are heated to 82 DEG C, is filtered, washed, does
It is dry, acetone, sodium hydroxide and carbinol mixture is then added and is uniformly mixed, is filtered, washed and dries again, first is then added
Benzene, Brij-721, phthalic acid, p-methyl benzenesulfonic acid are warming up to 80 DEG C, stir 20min, then heat to 100
DEG C stirring 30min, after cooling be added dipentaerythritol and toluene stirring, heat up 160 DEG C, stir evenly, after cooling cooling obtain
Modified montmorillonoid.
The processing technology of the above-mentioned dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve, specifically includes the following steps:
(1) by polytetrafluoroethylene (PTFE), high temperature resistant filler, wear-resistant material, 3min is mixed in graphite, then by mixture input air flow
Pulverizer mixed at high speed 5 minutes, until being cmpletely uniformly mixed, finally in sieving machine impurity screening；
(2) mold is carried out after step (1) treated mixture is stored 12 hours to suppress to obtain sealing ring material；
(3) sealing ring material proper alignment is warming up in baking oven 200 DEG C and keeps the temperature 2 hours, be warming up to 250 DEG C and keep the temperature 2 hours,
It is warming up to 375 DEG C and keeps the temperature 4 hours, then natural cooling；
(4) 180 DEG C of investment molds are naturally cooled to and answer repoussage shape, valve can be obtained in the dwell time 3 minutes in press pressure 15Mpa
The dedicated polytetrafluoroethylene (PTFE) of door fills polyparaphenylene sealing ring.
In the present embodiment, when step (2) mold is suppressed specifically:
Vulcanized using vulcanizing press, the adjusting gauge pressure for setting vulcanizing press keeps 120kgf/cm2, vulcanizing press
The control of upper plate temperature at 170 DEG C, lower plate temperatures are controlled at 180 DEG C, are vented 2 times in sulfidation, are made in the case where adjusting gauge pressure
Compression molding molding vulcanization 7min, is then opened, demoulds molding mixture, be cooled and shaped sealing ring material.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (6)
1. a kind of dedicated polytetrafluoroethylene (PTFE) of valve fills polyparaphenylene sealing ring, it is characterised in that: the sealing ring presses quality percentage
Include following components: polytetrafluoroethylene (PTFE) 65-70% than meter, high temperature resistant filler: 18-20%, wear-resistant material: 8-11%, graphite 2-5%,
Wherein:
The high temperature resistant filler is polyparaphenylene；The polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；It is described
Wear-resistant material be 300 mesh more than glass fibre；The graphite is No. 0 graphite of 300 mesh or more.
2. a kind of dedicated polytetrafluoroethylene (PTFE) of valve fills polyparaphenylene sealing ring, it is characterised in that: the sealing ring presses quality percentage
Include following components: polytetrafluoroethylene (PTFE) 65-70% than meter, high temperature resistant filler: 18-20%, wear-resistant material: 8-11%, graphite 2-5%,
Wherein:
The high temperature resistant filler is the mixture of polyparaphenylene, aluminium oxide, mica powder, size and compounded lubricant, wherein
Polyparaphenylene: aluminium oxide: mica powder: modified montmorillonoid: size: composite lubricated=2:3:1:1:1:1 is counted in mass ratio；
The size is trimethoxy silane, and the compounded lubricant is the grade ratios of molybdenum disulfide and oleic acid isooctanol ester
Example mixture；
The polytetrafluoroethylene (PTFE) is using polytetrafluoroethylene (PTFE) more than 500 mesh；
The wear-resistant material is the mixture of glass fibre, potassium peroxydisulfate, yttrium oxide, titanium carbide and zirconium boride, wherein presses matter
Amount is than meter glass fibre: potassium peroxydisulfate: yttrium oxide: titanium carbide: zirconium boride=3:2:1:1:1；
The glass fibre is the glass fibre of 300 mesh or more；
The graphite is No. 0 graphite of 300 mesh or more.
3. the dedicated polytetrafluoroethylene (PTFE) of valve according to claim 2 fills polyparaphenylene sealing ring, it is characterised in that: described
The preparation method of high temperature resistant filler is specific as follows:
(1) polyparaphenylene is sent and is warming up to 120 DEG C into kneader；
(2) aluminium oxide is added in kneader, stirs 10-20min, mica powder, modified montmorillonoid and composite lubricated is then added
Agent, adjusting revolving speed is 400-500 revs/min, stirs 10-13min, and be filled with nitrogen protection；
(3) mixed material that step (2) obtains is put into baking oven at 70 DEG C and dries 1h, then be warming up to 80 DEG C, dry 2h, after
It is continuous to be warming up to 90 DEG C of drying 3h, finally it is warming up to 100 DEG C of drying 1h；
(3) material after drying is immersed in size 1-2 days, takes out air-dried 3 days, obtains high temperature resistant filler.
4. the dedicated polytetrafluoroethylene (PTFE) of valve according to claim 3 fills polyparaphenylene sealing ring, it is characterised in that: described
Modified montmorillonoid using following technique prepare:
Nano montmorillonite, maleic anhydride, benzoyl peroxide, ethyl alcohol are uniformly mixed, are heated to 80-82 DEG C, be filtered, washed,
It is dry, acetone, sodium hydroxide and carbinol mixture is then added and is uniformly mixed, is filtered, washed and dries again, first is then added
Benzene, Brij-721, phthalic acid, p-methyl benzenesulfonic acid are warming up to 75-80 DEG C, stir 20min, then heat to
90-100 DEG C of stirring 30min is added dipentaerythritol and toluene stirring, heats up 150-160 DEG C, stir evenly, cool down after cooling
Cooling obtains modified montmorillonoid afterwards.
5. the processing technology of the dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve as described in claim 1 or 4, special
Sign is: specifically includes the following steps:
(1) by polytetrafluoroethylene (PTFE), high temperature resistant filler, wear-resistant material, 3min is mixed in graphite, then by mixture input air flow
Pulverizer mixed at high speed 5 minutes, until being cmpletely uniformly mixed, finally in sieving machine impurity screening；
(2) mold is carried out after step (1) treated mixture is stored 12 hours to suppress to obtain sealing ring material；
(3) sealing ring material proper alignment is warming up in baking oven 200 DEG C and keeps the temperature 2 hours, be warming up to 250 DEG C and keep the temperature 2 hours,
It is warming up to 375 DEG C and keeps the temperature 4 hours, then natural cooling；
(4) 180 DEG C of investment molds are naturally cooled to and answer repoussage shape, valve can be obtained in the dwell time 3 minutes in press pressure 15Mpa
The dedicated polytetrafluoroethylene (PTFE) of door fills polyparaphenylene sealing ring.
6. the processing technology of the dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve according to claim 5, special
Sign is: when step (2) mold is suppressed specifically:
Vulcanized using vulcanizing press, the adjusting gauge pressure for setting vulcanizing press keeps 120kgf/cm2, the compression molding
At 170 DEG C, lower plate temperatures are controlled at 180 DEG C, are vented 2 times in sulfidation, in the adjusting table for the upper plate temperature control of machine
Pressure makes the compression molding molding vulcanization 7min, is then opened, demoulds molding mixture, is cooled and shaped sealing loop material
Material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863548.7A CN108976676A (en) | 2018-08-01 | 2018-08-01 | A kind of dedicated polytetrafluoroethylene (PTFE) filling polyparaphenylene sealing ring of valve and its processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114935009A (en) * | 2022-04-29 | 2022-08-23 | 福州大学 | High-temperature-resistant metal rubber composite structure sealing gasket and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114935009A (en) * | 2022-04-29 | 2022-08-23 | 福州大学 | High-temperature-resistant metal rubber composite structure sealing gasket and preparation method thereof |
| CN114935009B (en) * | 2022-04-29 | 2024-01-23 | 福州大学 | High-temperature-resistant metal rubber composite structure sealing gasket and preparation method thereof |
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Application publication date: 20181211 |