CN108822313A - A kind of preparation method of polytetrafluoroethylene (PTFE) pellet - Google Patents
A kind of preparation method of polytetrafluoroethylene (PTFE) pellet Download PDFInfo
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- CN108822313A CN108822313A CN201810790701.8A CN201810790701A CN108822313A CN 108822313 A CN108822313 A CN 108822313A CN 201810790701 A CN201810790701 A CN 201810790701A CN 108822313 A CN108822313 A CN 108822313A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/16—Powdering or granulating by coagulating dispersions
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use 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; Derivatives of such polymers
- C08J2327/02—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
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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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Abstract
The invention discloses a kind of preparation methods of polytetrafluoroethylene (PTFE) pellet, are related to polytetrafluoroethylene material field, include the following steps：(1) preparation of premix；(2) ultrasonic disperse；(3) wet granulation；(4) preparation of parison；(5) preparation of polytetrafluoroethylene (PTFE) pellet；The method of the present invention uses barium sulfate filled polytetrafluoroethylene premix, and surfactant is added using wet granulation and prepares grained polytetrafluorethylefor for filling, and the material grain being prepared has apparent density height, average grain diameter small, the high advantage of powder flowbility.
Description
Technical field
The present invention relates to polytetrafluoroethylene material fields, and in particular to a kind of preparation method of polytetrafluoroethylene (PTFE) pellet.
Background technique
Polytetrafluoroethylene (PTFE) is a kind of material that performance is fabulous, it can be ageing-resistant, there is good chemical stability, excellent electricity
Insulating properties and good lubricity, use temperature range is wide, is widely applied by every profession and trade.In polytetrafluoroethylene (PTFE) as polymer
It when filler, needs polytetrafluoroethylene (PTFE) that there is good powder flowbility, is conducive to material and processes, but polytetrafluoroethylene (PTFE) powder itself
Poor fluidity, bulk density are low.
Chinese patent CN101137702B discloses a kind of manufacturing method of polytetrafluoroethylgranule granule containing filler, in difficulty
It is dissolved in the presence of the liquid organic matter of water, polytetrafluorethylepowder powder is stirred in water and the mixture of filler is pelletized
When, ptfe emulsion and coagulating agent are added, the ptfe emulsion is made to condense in the polytetrafluoroethylene (PTFE) containing filler
The surface layer of grain.By the available filler of this method disengaging less, the polytetrafluoroethylene (PTFE) containing filler of excellent flowability
Grain, and ptfe emulsion can be prevented to be emitted into the waste liquid from manufacturing process.This contains the polytetrafluoroethyl-ne of filler
The manufacturing method of alkene particle is characterized in that, in the presence of being insoluble in the liquid organic matter of water, PTFE powder is stirred in water
When being granulated with the mixture of filler, PTFE emulsion and coagulating agent are added, condenses in the PTFE emulsion containing filler
The surface layer of PTFE particle.Enhance the mobility of material.
Chinese patent CN103193992B discloses the side that a kind of ptfe emulsion prepares superfine powder of polytetrafluoroethylene
Method includes the following steps：(1) ptfe emulsion is stirred to being demulsified at 50-90 DEG C, obtains floccule；(2) by step
(1) floccule obtained carries out centrifugation for the first time to remove part water；(3) it is added for the first time in the material after being centrifuged to first time
After water, carries out second and stir；(4) material after stirring second carries out second and is centrifuged；(5) after being centrifuged to second
In material after second of water supplement, third time stirring is carried out；(6) material after stirring third time carries out third time centrifugation；(7)
Dry materials after third time is centrifuged obtain superfine powder of polytetrafluoroethylene, have good mobility and lubricity.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of preparation methods of polytetrafluoroethylene (PTFE) pellet, originally
Inventive method uses barium sulfate filled polytetrafluoroethylene premix, and surfactant is added and is prepared granular using wet granulation
Filled polytetrafluoroethylene, the material grain being prepared have apparent density height, average grain diameter small, the high advantage of powder flowbility.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of preparation method of polytetrafluoroethylene (PTFE) pellet, includes the following steps：
(1) fine polytetrafluoroethylpowder powder and barium sulfate particle are mixed, is put into high-speed multifunctional pulverizer, high speed refinement,
It is homogenized and premix is made；
(2) above-mentioned premix is added in deionized water, is uniformly mixed, suitable surfactant is added, stirs
It mixes after mixing, is warming up to 45-50 degrees Celsius, under the ultrasonic power of 4-10KW, disperse 4-8 minutes；
(3) under 800-1200 revs/min of mixing speed, it is slowly dropped into chloromethane in the product in step (2),
Control continues stirring 22-30 minutes at the uniform velocity completion of dropwise addition in 20-30 minutes, filters, after filtrate is cleaned 4-6 times with deionized water,
It is placed in dry in baking oven；
(4) by the uniform cloth to mold of obtained product of step (3), compression molding is demoulded to get parison；
(5) parison made from step (4) is put into sintering furnace and is sintered, is slowly cooled to room temperature, send into pulverizer into
Row crush, sieving to get.
Preferably, the mass ratio of polytetrafluoroethylene (PTFE) and barium sulfate is 10 in the step (1):2-5.
Preferably, the mass ratio of polytetrafluoroethylene (PTFE) and barium sulfate is 10 in the step (1):3.
Preferably, the revolving speed of step (1) the high speed multifunctional crusher is 4500-5000 revs/min.
Preferably, surfactant is FOA surfactant, FBS surfactant, the surface OA-12 in the step (2)
One or more of activating agent and L-42 surfactant combine.
Preferably, the dosage of step (2) surfactant is equivalent to the 3-5% of premix weight.
Preferably, chloromethane and the mass ratio of pre-mixed material are 10 in the step (3):7-8.
Preferably, the chloromethane in the step (3) is at least one of dichloromethane or chloroform.
Preferably, the drying in the step (3) is drying 8-10 hours under 160-170 degrees Celsius.
Preferably, the sintering in the step (5) is specially：First stage：Under 150-200 degrees Celsius, heat preservation and dryness 2-3
Hour；Second stage：250-300 degrees Celsius, heat-insulation preheating 1-2 hours；Phase III：Under nitrogen protection, continue heating to rise
Temperature is cooled to 330-340 degrees Celsius with 10-30 degrees Celsius/hour speed, protects to after 390 degrees Celsius, heat preservation sintering 4-5 hours
It is 1-2 hours warm, continue to be cooled to 300-310 degrees Celsius at a same speed, stops logical nitrogen, after heat preservation 1-2 hours, with 20-
After 40 degree Celsius/hour speed are cooled to 250 degrees Celsius, fast cooling to room temperature.
The present invention has following beneficial effect：
(1) the method for the present invention uses barium sulfate filled polytetrafluoroethylene premix, surfactant is added, using wet process
It is granulated, prepares grained polytetrafluorethylefor for filling, the material grain being prepared has apparent density height, average grain diameter small, flow of powder
The high advantage of property；
(2) premix goes out to pass through wetting in water and organic liquid interface under the action of surfactant, disperses and solidifying
Granulating in poly- process, chloromethane are slowly dropped into addition, and coacervation occurs again after reducing granulating, generates bigger pellet
Particle causes granulation outcome not utilize, and chloromethane, which is slowly at the uniform velocity added, can be such that premix fine powder delays under stirring
It is slow wetted, be conducive to be granulated.
(3) surfactant is added in the method for the present invention, facilitates the stability of premix suspension liquid architecture, mentions
The uniformity that solid-liquid is distributed in supernatant liquid is uphang, final granulation outcome is enhanced.
Specific embodiment
Below with reference to embodiment, further description of the specific embodiments of the present invention, and following embodiment is only used for more
Technical solution of the present invention is clearly demonstrated, and not intended to limit the protection scope of the present invention.
Embodiment 1
A kind of preparation method of polytetrafluoroethylene (PTFE) pellet, includes the following steps：
(1) fine polytetrafluoroethylpowder powder and barium sulfate particle are mixed, is put into high-speed multifunctional pulverizer, high speed refinement,
It is homogenized and premix is made；
(2) above-mentioned premix is added in deionized water, is uniformly mixed, suitable surfactant is added, stirs
It mixes after mixing, is warming up to 45 degrees Celsius, under the ultrasonic power of 4KW, disperse 4 minutes；
(3) under 800-1200 revs/min of mixing speed, it is slowly dropped into chloromethane in the product in step (2),
Control continues stirring 22 minutes at the uniform velocity completion of dropwise addition in 20 minutes, and filtering after filtrate cleans 4 times with deionized water, is placed in baking oven
Middle drying；
(4) by the uniform cloth to mold of obtained product of step (3), compression molding is demoulded to get parison；
(5) parison made from step (4) is put into sintering furnace and is sintered, is slowly cooled to room temperature, send into pulverizer into
Row crush, sieving to get.
The mass ratio of polytetrafluoroethylene (PTFE) and barium sulfate is 10 in step (1):2.
The revolving speed of step (1) high speed multifunctional crusher is 4500 revs/min.
Surfactant is FOA surfactant L in step (2).
The dosage of step (2) surfactant is equivalent to the 3% of premix weight.
Chloromethane and the mass ratio of pre-mixed material are 10 in step (3):7.
Chloromethane in step (3) is methylene chloride.
Drying in step (3) is the drying 8 hours under 160 degrees Celsius.
Sintering in step (5) is specially：First stage：Under 150 degrees Celsius, heat preservation and dryness 2 hours；Second stage：250
Degree Celsius, heat-insulation preheating 1 hour；Phase III：Under nitrogen protection, continue to be heated to 390 degrees Celsius, heat preservation sintering 4
After hour, 330 degrees Celsius are cooled to 10 degree Celsius/hour speed, 1 hour is kept the temperature, continues to be cooled to 310 at a same speed
Degree Celsius, stop logical nitrogen, after heat preservation 1 hour, after being cooled to 250 degrees Celsius with 20 degree Celsius/hour speed, fast cooling is extremely
Room temperature.
Embodiment 2
A kind of preparation method of polytetrafluoroethylene (PTFE) pellet, includes the following steps：
(1) fine polytetrafluoroethylpowder powder and barium sulfate particle are mixed, is put into high-speed multifunctional pulverizer, high speed refinement,
It is homogenized and premix is made；
(2) above-mentioned premix is added in deionized water, is uniformly mixed, suitable surfactant is added, stirs
It mixes after mixing, is warming up to 50 degrees Celsius, under the ultrasonic power of 10KW, disperse 8 minutes；
(3) under 1200 revs/min of mixing speed, it is slowly dropped into chloromethane in the product in step (2), is controlled
In at the uniform velocity completion of dropwise addition in 30 minutes, continue stirring 30 minutes, filtering after filtrate cleans 6 times with deionized water, is placed in baking oven and does
It is dry；
(4) by the uniform cloth to mold of obtained product of step (3), compression molding is demoulded to get parison；
(5) parison made from step (4) is put into sintering furnace and is sintered, is slowly cooled to room temperature, send into pulverizer into
Row crush, sieving to get.
The mass ratio of polytetrafluoroethylene (PTFE) and barium sulfate is 10 in step (1):5.
The revolving speed of step (1) high speed multifunctional crusher is 5000 revs/min.
Surfactant is FBS surfactant in step (2).
The dosage of step (2) surfactant is equivalent to the 5% of premix weight.
Chloromethane and the mass ratio of pre-mixed material are 10 in step (3):8.
Chloromethane in step (3) is chloroform.
Drying in step (3) is the drying 10 hours under 170 degrees Celsius.
Sintering in step (5) is specially：First stage：Under 200 degrees Celsius, heat preservation and dryness 3 hours；Second stage：300
Degree Celsius, heat-insulation preheating 2 hours；Phase III：Under nitrogen protection, continue to be heated to 390 degrees Celsius, heat preservation sintering 5
After hour, 340 degrees Celsius are cooled to 30 degree Celsius/hour speed, 2 hours is kept the temperature, continues to be cooled to 300 at a same speed
Degree Celsius, stop logical nitrogen, after heat preservation 2 hours, after being cooled to 250 degrees Celsius with 40 degree Celsius/hour speed, fast cooling is extremely
Room temperature.
Embodiment 3
A kind of preparation method of polytetrafluoroethylene (PTFE) pellet, includes the following steps：
(1) fine polytetrafluoroethylpowder powder and barium sulfate particle are mixed, is put into high-speed multifunctional pulverizer, high speed refinement,
It is homogenized and premix is made；
(2) above-mentioned premix is added in deionized water, is uniformly mixed, suitable surfactant is added, stirs
It mixes after mixing, is warming up to 48 degrees Celsius, under the ultrasonic power of 8KW, disperse 7 minutes；
(3) under 1000 revs/min of mixing speed, it is slowly dropped into chloromethane in the product in step (2), is controlled
In at the uniform velocity completion of dropwise addition in 28 minutes, continue stirring 26 minutes, filtering after filtrate cleans 5 times with deionized water, is placed in baking oven and does
It is dry；
(4) by the uniform cloth to mold of obtained product of step (3), compression molding is demoulded to get parison；
(5) parison made from step (4) is put into sintering furnace and is sintered, is slowly cooled to room temperature, send into pulverizer into
Row crush, sieving to get.
The mass ratio of polytetrafluoroethylene (PTFE) and barium sulfate is 10 in step (1):4.
The revolving speed of step (1) high speed multifunctional crusher is 4600 revs/min.
Surfactant is OA-12 surfactant in step (2).
The dosage of step (2) surfactant is equivalent to the 4% of premix weight.
Chloromethane and the mass ratio of pre-mixed material are 10 in step (3):7.5.
Chloromethane in step (3) is chloroform.
Drying in step (3) is the drying 9 hours under 164 degrees Celsius.
Sintering in step (5) is specially：First stage：Under 180 degrees Celsius, heat preservation and dryness 2.4 hours；Second stage：
260 degrees Celsius, heat-insulation preheating 1.6 hours；Phase III：Under nitrogen protection, continue to be heated to 390 degrees Celsius, heat preservation
After sintering 4.8 hours, 336 degrees Celsius are cooled to 24 degree Celsius/hour speed, 1.4 hours is kept the temperature, continues at a same speed
308 degrees Celsius are cooled to, stops logical nitrogen and is cooled to 250 degrees Celsius after heat preservation 1.7 hours with 28 degree Celsius/hour speed
Afterwards, fast cooling is to room temperature.
Embodiment 4
A kind of preparation method of polytetrafluoroethylene (PTFE) pellet, includes the following steps：
(1) fine polytetrafluoroethylpowder powder and barium sulfate particle are mixed, is put into high-speed multifunctional pulverizer, high speed refinement,
It is homogenized and premix is made；
(2) above-mentioned premix is added in deionized water, is uniformly mixed, suitable surfactant is added, stirs
It mixes after mixing, is warming up to 48 degrees Celsius, under the ultrasonic power of 9KW, disperse 7 minutes；
(3) under 1100 revs/min of mixing speed, it is slowly dropped into chloromethane in the product in step (2), is controlled
In at the uniform velocity completion of dropwise addition in 28 minutes, continue stirring 27 minutes, filtering after filtrate cleans 6 times with deionized water, is placed in baking oven and does
It is dry；
(4) by the uniform cloth to mold of obtained product of step (3), compression molding is demoulded to get parison；
(5) parison made from step (4) is put into sintering furnace and is sintered, is slowly cooled to room temperature, send into pulverizer into
Row crush, sieving to get.
The mass ratio of polytetrafluoroethylene (PTFE) and barium sulfate is 10 in step (1):3.
The revolving speed of step (1) high speed multifunctional crusher is 4900 revs/min.
Surfactant is L-42 surfactant in step (2).
The dosage of step (2) surfactant is equivalent to the 3.8% of premix weight.
Chloromethane and the mass ratio of pre-mixed material are 10 in step (3):7.8.
Chloromethane in step (3) is chloroform.
Drying in step (3) is the drying 8 hours under 165 degrees Celsius.
Sintering in step (5) is specially：First stage：Under 160 degrees Celsius, heat preservation and dryness 2.6 hours；Second stage：
280 degrees Celsius, heat-insulation preheating 1.7 hours；Phase III：Under nitrogen protection, continue to be heated to 390 degrees Celsius, heat preservation
After sintering 4.6 hours, 335 degrees Celsius are cooled to 20 degree Celsius/hour speed, 1.5 hours is kept the temperature, continues at a same speed
308 degrees Celsius are cooled to, stops logical nitrogen and is cooled to 250 degrees Celsius after heat preservation 1.8 hours with 30 degree Celsius/hour speed
Afterwards, fast cooling is to room temperature.
Polytetrafluoroethylene (PTFE) pellet made from embodiment 1-4 is tested for the property, as a result such as the following table 1：
In conclusion the present invention has the following advantages that：
(1) the method for the present invention uses barium sulfate filled polytetrafluoroethylene premix, surfactant is added, using wet process
It is granulated, prepares grained polytetrafluorethylefor for filling, the material grain being prepared has apparent density height, average grain diameter small, flow of powder
The high advantage of property；
(2) premix goes out to pass through wetting in water and organic liquid interface under the action of surfactant, disperses and solidifying
Granulating in poly- process, chloromethane are slowly dropped into addition, and coacervation occurs again after reducing granulating, generates bigger pellet
Particle causes granulation outcome not utilize, and chloromethane, which is slowly at the uniform velocity added, can be such that premix fine powder delays under stirring
It is slow wetted, be conducive to be granulated.
(3) surfactant is added in the method for the present invention, facilitates the stability of premix suspension liquid architecture, mentions
The uniformity that solid-liquid is distributed in supernatant liquid is uphang, final granulation outcome is enhanced.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of preparation method of polytetrafluoroethylene (PTFE) pellet, which is characterized in that include the following steps：
(1) fine polytetrafluoroethylpowder powder and barium sulfate particle are mixed, is put into high-speed multifunctional pulverizer, high speed refinement, homogenizing
Premix is made；
(2) above-mentioned premix is added in deionized water, is uniformly mixed, suitable surfactant is added, stirring is mixed
After closing uniformly, it is warming up to 45-50 degrees Celsius, under the ultrasonic power of 4-10KW, is dispersed 4-8 minutes；
(3) under 800-1200 revs/min of mixing speed, it is slowly dropped into chloromethane in the product in step (2), is controlled
In at the uniform velocity completion of dropwise addition in 20-30 minutes, continue stirring 22-30 minutes, filtering after filtrate is cleaned 4-6 times with deionized water, is placed in
It is dry in baking oven；
(4) by the uniform cloth to mold of obtained product of step (3), compression molding is demoulded to get parison；
(5) parison made from step (4) is put into sintering furnace and is sintered, is slowly cooled to room temperature, sent into pulverizer and carry out powder
It is broken, sieving to get.
2. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 1, which is characterized in that gather in the step (1)
The mass ratio of tetrafluoroethene and barium sulfate is 10:2-5.
3. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 2, which is characterized in that gather in the step (1)
The mass ratio of tetrafluoroethene and barium sulfate is 10:3.
4. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 1, which is characterized in that high in the step (1)
The revolving speed of fast multifunctional crusher is 4500-5000 revs/min.
5. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 1, which is characterized in that table in the step (2)
Face activating agent is one of FOA surfactant, FBS surfactant, OA-12 surfactant and L-42 surfactant
Or several combinations.
6. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 5, which is characterized in that step (2) surface
The dosage of activating agent is equivalent to the 3-5% of premix weight.
7. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 1, which is characterized in that chlorine in the step (3)
It is 10 for methane and the mass ratio of pre-mixed material:7-8.
8. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 7, which is characterized in that in the step (3)
Chloromethane is at least one of dichloromethane or chloroform.
9. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 1, which is characterized in that in the step (3)
Dry is drying 8-10 hours under 160-170 degrees Celsius.
10. the preparation method of polytetrafluoroethylene (PTFE) pellet according to claim 1, which is characterized in that in the step (5)
Sintering is specially：First stage：Under 150-200 degrees Celsius, heat preservation and dryness 2-3 hours；Second stage：It 250-300 degrees Celsius, protects
Temperature preheating 1-2 hours；Phase III：Under nitrogen protection, continue to be heated to 390 degrees Celsius, heat preservation sintering 4-5 hours
Afterwards, it is cooled to 330-340 degrees Celsius with 10-30 degrees Celsius/hour speed, keeps the temperature 1-2 hours, continues to cool down at a same speed
To 300-310 degrees Celsius, stops logical nitrogen and it is Celsius to be cooled to 250 with 20-40 degrees Celsius/hour speed after heat preservation 1-2 hours
After degree, fast cooling to room temperature.
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| WO2004024348A1 (en) * | 2002-09-13 | 2004-03-25 | Akzo Nobel Coatings International B.V. | Multilayer non-stick coating |
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| CN101307166A (en) * | 2007-05-17 | 2008-11-19 | 西北工业大学 | Grained polytetrafluorethylene for filling and method for preparing same |
| CN102205651A (en) * | 2010-12-24 | 2011-10-05 | 东莞市新志密封技术有限公司 | Method for sintering polytetrafluoroethylene |
| CN105835251A (en) * | 2016-03-30 | 2016-08-10 | 济南赛诺富隆新材料有限公司 | Preparation method of polytetrafluoroethylene particles |
-
2018
- 2018-07-18 CN CN201810790701.8A patent/CN108822313A/en not_active Withdrawn
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|---|---|---|---|---|
| WO2004024348A1 (en) * | 2002-09-13 | 2004-03-25 | Akzo Nobel Coatings International B.V. | Multilayer non-stick coating |
| CN101177516A (en) * | 2006-11-10 | 2008-05-14 | 丁永津 | High-wearing polytetrafluoroethylene composite material and method for making same |
| CN101307166A (en) * | 2007-05-17 | 2008-11-19 | 西北工业大学 | Grained polytetrafluorethylene for filling and method for preparing same |
| CN102205651A (en) * | 2010-12-24 | 2011-10-05 | 东莞市新志密封技术有限公司 | Method for sintering polytetrafluoroethylene |
| CN105835251A (en) * | 2016-03-30 | 2016-08-10 | 济南赛诺富隆新材料有限公司 | Preparation method of polytetrafluoroethylene particles |
Non-Patent Citations (1)
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Application publication date: 20181116 |