CN115521396A - Production process of polytetrafluoroethylene suspension resin - Google Patents
Production process of polytetrafluoroethylene suspension resin Download PDFInfo
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- CN115521396A CN115521396A CN202211389047.2A CN202211389047A CN115521396A CN 115521396 A CN115521396 A CN 115521396A CN 202211389047 A CN202211389047 A CN 202211389047A CN 115521396 A CN115521396 A CN 115521396A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—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
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/18—Suspension polymerisation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—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
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
- C08F214/262—Tetrafluoroethene with fluorinated vinyl ethers
Abstract
The invention discloses a production process of polytetrafluoroethylene suspension resin, which comprises the following raw material components: 40-60 parts of deionized water, 10-18 parts of tetrafluoroethylene monomer, 2-8 parts of modified monomer, 1-5 parts of initiator, 0.2-1 part of reducing agent, 0.2-1 part of buffer salt and 3-9 parts of composition; the composition consists of a free radical initiator and a molecular weight promoter, wherein the tetrafluoroethylene monomer is subjected to suspension polymerization reaction under the action of the free radical initiator and the molecular weight promoter. Has the advantages that: by adopting the cooling operation, the self-acceleration phenomenon of the polymerization reaction can be effectively controlled, the modified monomer can be uniformly connected to the polymer main chain, the content of the modified monomer in the polymer is improved under the condition of the same modified monomer dosage, the creep resistance and the weldability of the resin are enhanced, the base strength is improved, and the resin product has uniform structure and excellent performance.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a production process of polytetrafluoroethylene suspension resin.
Background
Among a plurality of fluoroplastics, polytetrafluoroethylene resin has good heat resistance, non-adhesiveness, weather resistance, chemical resistance, low friction coefficient, electrical characteristics and the like, is widely contacted and used by people, plays an important role in modern industry, and is called as 'plastic king'. The PTFE suspension resin accounts for more than 75 percent of the PTFE resin and is one of the main products of the PTFE resin.
The polytetrafluoroethylene resin is used as engineering plastic, and the PTFE resin (polytetrafluoroethylene) has the defects of poor creep resistance, low hardness, no wear resistance, large void ratio of products and the like. The above disadvantages are mainly caused by the linear and regular rigid polymer chain structure of PTFE, which makes the polymer have high crystallinity and melt viscosity. The solution to the above problems is usually compensated by physical modification and chemical modification. Physical modification mainly refers to filling technology of PTFE resin. The chemical modification adopts a method of copolymerizing tetrafluoroethylene monomers and other monomers of perfluoroolefin. With the development of the fluoropolymer theory, a very small amount of perfluoroolefin or perfluorovinyl ether modified monomer is added, so that certain properties of the obtained polytetrafluoroethylene resin can be improved, and the polytetrafluoroethylene resin completely has the processing property of tetrafluoroethylene suspension resin.
The initiation systems in the method are all inorganic initiation systems, so that the polymerization reaction process is difficult to control, and more inorganic ions are introduced into the polymerization system to influence the processing performance of the resin; the method has the advantages that the molecular weight of the resin is low, the tensile property is poor, the molecular weight of the resin is insufficient, the basic strength is low, the high-end application of the polytetrafluoroethylene suspension resin is limited, the polymerization temperature is controlled by adopting constant-temperature operation, the initiation is too fast in the early stage of the polymerization reaction, and the self-acceleration phenomenon of the reaction of the tetrafluoroethylene monomer exists in the later stage of the polymerization reaction.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides a production process of polytetrafluoroethylene suspension resin, which aims to overcome the technical problems in the prior related art.
Therefore, the invention adopts the following specific technical scheme:
a production process of polytetrafluoroethylene suspension resin comprises the following raw material components:
40-60 parts of deionized water, 10-18 parts of tetrafluoroethylene monomer, 2-8 parts of modified monomer, 1-5 parts of initiator, 0.2-1 part of reducing agent, 0.2-1 part of buffer salt and 3-9 parts of composition;
the composition consists of a free radical initiator and a molecular weight promoter, wherein the tetrafluoroethylene monomer is subjected to suspension polymerization under the action of the free radical initiator and the molecular weight promoter;
it is prepared by the following method;
adding deionized water into a reaction kettle, reserving 20-30% of space, adding an initiator and buffer salt, and heating the reaction kettle to 35-55 ℃ to obtain a mixture;
continuing to add the modifying monomer, the reducing agent and the tetrafluoroethylene monomer to the mixture for polymerization;
after the reaction starts, the residual modified monomer is replenished into the system, and in the reaction process, the residual tetrafluoroethylene monomer is continuously replenished, and the temperature is controlled;
after the reaction is finished, washing, drying and crushing the product to obtain modified polytetrafluoroethylene suspension resin powder;
pressing the obtained polytetrafluoroethylene resin powder into a blank at 10-200 ℃ and 12-64MaP to obtain a preform;
putting the obtained preformed object into a pre-prepared die, putting the preformed object into a sintering furnace together for sintering, and heating to 280-500 ℃;
gradually cooling the blank in the sintering material to room temperature in a die at a set cooling rate to obtain a polytetrafluoroethylene suspension resin blank;
turning the obtained polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness to obtain the polytetrafluoroethylene suspension resin capable of enhancing the creep-resistant weldability.
Preferably, the molecular weight promoter is perfluorobutyl ethylene.
Preferably, the temperature control is as follows: when the feeding amount of the tetrafluoroethylene monomer is 0-18%, controlling the temperature to increase between 40 and 65 ℃, when the feeding amount of the tetrafluoroethylene monomer is 18-78%, keeping the reaction temperature between 50 and 60 ℃, and when the feeding amount of the tetrafluoroethylene monomer is 78-100%, controlling the temperature between 45 and 55 ℃.
Preferably, the reducing agent is one or more of sodium sulfite, sodium bisulfite, ferrous sulfate and oxalic acid, and the buffer salt is one or more of sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium phosphate, potassium phosphate and potassium pyrophosphate.
Preferably, the modified monomer is perfluoropropene, perfluoromethyl vinyl ether or perfluoropropyl vinyl ether, and the organic initiator comprises one or more of succinic peroxide and benzoyl peroxide.
Preferably, the temperature of the suspension polymerization reaction is 18-38 ℃, and the pressure of the suspension polymerization reaction is 0.5-1.5MPa.
Preferably, the inorganic initiator comprises one or more of potassium sulfate, sodium persulfate, ammonium persulfate, potassium permanganate-oxalic acid, potassium bromate-sodium sulfite and potassium bromate-sodium bisulfite.
Preferably, the temperature distribution on the preform is uniform, and the temperature difference is controlled within +/-5 ℃; the sintering furnace should have a good thermal insulation so that the cooling rate does not exceed 20 ℃/h when the door is closed for cooling.
Preferably, the die casting machine is a press capable of rapidly rising, the pressure needs to reach 64MPa, and the press is provided with a heating furnace.
Preferably, the die is a full-pressure die made of heat-treated nickel-chromium steel and is heated by hot oil circulation or electric heating.
The invention has the beneficial effects that: by adopting the cooling operation, the self-acceleration phenomenon of the polymerization reaction can be effectively controlled, the modified monomer can be uniformly connected to the polymer main chain, the content of the modified monomer in the polymer is improved under the condition of the same modified monomer dosage, the creep resistance and the weldability of the resin are enhanced, the base strength is improved, and the resin product has uniform structure and excellent performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart showing the steps of a process for producing a polytetrafluoroethylene suspension resin according to an embodiment of the invention.
Detailed Description
For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable one skilled in the art to understand the embodiments and advantages of the disclosure for reference and without scale, wherein elements are not shown in the drawings and like reference numerals are used to refer to like elements generally.
According to an embodiment of the invention, a process for producing a polytetrafluoroethylene suspension resin is provided.
The first embodiment;
as shown in FIG. 1, the production process of the polytetrafluoroethylene suspension resin according to the embodiment of the invention comprises the following raw material components:
40-60 parts of deionized water, 10-18 parts of tetrafluoroethylene monomer, 2-8 parts of modified monomer, 1-5 parts of initiator, 0.2-1 part of reducing agent, 0.2-1 part of buffer salt and 3-9 parts of composition;
the composition consists of a free radical initiator and a molecular weight promoter, wherein the tetrafluoroethylene monomer is subjected to suspension polymerization under the action of the free radical initiator and the molecular weight promoter;
it is prepared by the following method;
adding deionized water into a reaction kettle, reserving 20-30% of space, adding an initiator and buffer salt, and heating the reaction kettle to 35-55 ℃ to obtain a mixture;
continuing to add the modifying monomer, the reducing agent and the tetrafluoroethylene monomer to the mixture to carry out a polymerization reaction;
after the reaction starts, the residual modified monomer is replenished into the system, and in the reaction process, the residual tetrafluoroethylene monomer is continuously replenished, and the temperature is controlled;
after the reaction is finished, washing, drying and crushing the product to obtain modified polytetrafluoroethylene suspension resin powder;
pressing the obtained polytetrafluoroethylene resin powder into a blank at 10-200 ℃ and 12-64MaP to obtain a preform;
putting the obtained preformed object into a pre-prepared die, putting the preformed object into a sintering furnace together for sintering, and heating to 280-500 ℃;
gradually cooling the blank in the sintered material in a die at a set cooling rate to room temperature to obtain a polytetrafluoroethylene suspension resin blank;
and turning the obtained polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness to obtain the polytetrafluoroethylene suspension resin capable of enhancing the creep resistance weldability.
The molecular weight promoter is perfluorobutyl ethylene.
The temperature control is as follows: when the charging amount of the tetrafluoroethylene monomer is 0-18%, the temperature is controlled to increase between 40 ℃ and 65 ℃, when the charging amount of the tetrafluoroethylene monomer is 18-78%, the reaction temperature is kept between 50 ℃ and 60 ℃, and when the charging amount of the tetrafluoroethylene monomer is 78-100%, the temperature is controlled to be 45-55 ℃.
The reducing agent is one or more of sodium sulfite, sodium bisulfite, ferrous sulfate and oxalic acid, and the buffer salt is one or more of sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium phosphate, potassium phosphate and potassium pyrophosphate.
The modified monomer is perfluoropropene, perfluoromethyl vinyl ether or perfluoropropyl vinyl ether, and the organic initiator comprises one or more of succinic peroxide and benzoyl peroxide.
The temperature of the suspension polymerization reaction is 18-38 ℃, and the pressure of the suspension polymerization reaction is 0.5-1.5MPa.
The inorganic initiator comprises one or more of potassium sulfate, sodium persulfate, ammonium persulfate, potassium permanganate-oxalic acid, potassium bromate-sodium sulfite and potassium bromate-sodium bisulfite.
The temperature distribution on the preformed object is uniform, and the temperature difference is controlled within +/-5 ℃; the sintering furnace should have a good thermal insulation so that the cooling rate does not exceed 20 ℃/h when the door is closed for cooling.
The die casting machine is a press capable of rapidly rising, the pressure needs to reach 64MPa, and a heating furnace is arranged on the press.
The die is a full-pressure die made of heat-treated nickel-chromium steel and is heated by hot oil circulation or electric heating.
The second embodiment;
as shown in FIG. 1, the production process of the polytetrafluoroethylene suspension resin according to the embodiment of the invention comprises the following raw material components:
40 parts of deionized water, 10 parts of tetrafluoroethylene monomer, 2 parts of modified monomer, 1 part of initiator, 0.2 part of reducing agent, 0.2 part of buffer salt and 3 parts of composition;
the composition consists of a free radical initiator and a molecular weight promoter, wherein the tetrafluoroethylene monomer is subjected to suspension polymerization under the action of the free radical initiator and the molecular weight promoter;
it is prepared by the following method;
adding deionized water into a reaction kettle, reserving 20-30% of space, adding an initiator and buffer salt, and heating the reaction kettle to 35-55 ℃ to obtain a mixture;
continuing to add the modifying monomer, the reducing agent and the tetrafluoroethylene monomer to the mixture for polymerization;
after the reaction starts, adding the rest of the modified monomer into the system, continuously adding the rest of the tetrafluoroethylene monomer in the reaction process, and controlling the temperature;
after the reaction is finished, washing, drying and crushing the product to obtain modified polytetrafluoroethylene suspension resin powder;
pressing the obtained polytetrafluoroethylene resin powder into a blank at 10-200 ℃ and 12-64MaP to obtain a preform;
putting the obtained preformed object into a prepared die, putting the preformed object into a sintering furnace for sintering, and heating to 280-500 ℃;
gradually cooling the blank in the sintered material in a die at a set cooling rate to room temperature to obtain a polytetrafluoroethylene suspension resin blank;
turning the obtained polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness to obtain the polytetrafluoroethylene suspension resin capable of enhancing the creep-resistant weldability.
Example three;
as shown in FIG. 1, the production process of the polytetrafluoroethylene suspension resin according to the embodiment of the invention comprises the following raw material components:
50 parts of deionized water, 14 parts of tetrafluoroethylene monomer, 6 parts of modified monomer, 3 parts of initiator, 0.6 part of reducing agent, 0.6 part of buffer salt and 6 parts of composition;
the composition consists of a free radical initiator and a molecular weight promoter, wherein the tetrafluoroethylene monomer is subjected to suspension polymerization reaction under the action of the free radical initiator and the molecular weight promoter;
it is prepared by the following method;
adding deionized water into a reaction kettle, reserving 20-30% of space, adding an initiator and buffer salt, and heating the reaction kettle to 35-55 ℃ to obtain a mixture;
continuing to add the modifying monomer, the reducing agent and the tetrafluoroethylene monomer to the mixture for polymerization;
after the reaction starts, adding the rest of the modified monomer into the system, continuously adding the rest of the tetrafluoroethylene monomer in the reaction process, and controlling the temperature;
after the reaction is finished, washing, drying and crushing the product to obtain modified polytetrafluoroethylene suspension resin powder;
pressing the obtained polytetrafluoroethylene resin powder into a blank at 10-200 ℃ and 12-64MaP to obtain a pre-formed product;
putting the obtained preformed object into a prepared die, putting the preformed object into a sintering furnace for sintering, and heating to 280-500 ℃;
gradually cooling the blank in the sintered material in a die at a set cooling rate to room temperature to obtain a polytetrafluoroethylene suspension resin blank;
turning the obtained polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness to obtain the polytetrafluoroethylene suspension resin capable of enhancing the creep-resistant weldability.
The fourth embodiment;
as shown in FIG. 1, the production process of the polytetrafluoroethylene suspension resin according to the embodiment of the invention comprises the following raw material components:
60 parts of deionized water, 18 parts of tetrafluoroethylene monomer, 8 parts of modified monomer, 5 parts of initiator, 1 part of reducing agent, 1 part of buffer salt and 9 parts of composition;
the composition consists of a free radical initiator and a molecular weight promoter, wherein the tetrafluoroethylene monomer is subjected to suspension polymerization reaction under the action of the free radical initiator and the molecular weight promoter;
it is prepared by the following method;
adding deionized water into a reaction kettle, reserving 20-30% of space, adding an initiator and buffer salt, and heating the reaction kettle to 35-55 ℃ to obtain a mixture;
continuing to add the modifying monomer, the reducing agent and the tetrafluoroethylene monomer to the mixture for polymerization;
after the reaction starts, adding the rest of the modified monomer into the system, continuously adding the rest of the tetrafluoroethylene monomer in the reaction process, and controlling the temperature;
after the reaction is finished, washing, drying and crushing the product to obtain modified polytetrafluoroethylene suspension resin powder;
pressing the obtained polytetrafluoroethylene resin powder into a blank at 10-200 ℃ and 12-64MaP to obtain a preform;
putting the obtained preformed object into a prepared die, putting the preformed object into a sintering furnace for sintering, and heating to 280-500 ℃;
gradually cooling the blank in the sintered material in a die at a set cooling rate to room temperature to obtain a polytetrafluoroethylene suspension resin blank;
turning the obtained polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness to obtain the polytetrafluoroethylene suspension resin capable of enhancing the creep-resistant weldability.
As shown in fig. 1, according to an embodiment of the present invention, a process for producing a polytetrafluoroethylene suspension resin is also provided.
The method comprises the following steps:
step S101, adding deionized water into a reaction kettle, reserving 20-30% of space, adding an initiator and buffer salt, and heating the reaction kettle to 35-55 ℃ to obtain a mixture;
step S103, continuously adding the modified monomer, the reducing agent and the tetrafluoroethylene monomer into the mixture to carry out polymerization reaction;
s105, after the reaction starts, supplementing the remaining modified monomer into the system, continuously supplementing the remaining tetrafluoroethylene monomer in the reaction process, and controlling the temperature;
s107, washing, drying and crushing a product after the reaction is finished to obtain modified polytetrafluoroethylene suspension resin powder;
step S109, pressing the obtained polytetrafluoroethylene resin powder into a blank at 10-200 ℃ and 12-64MaP to obtain a pre-formed product;
s111, putting the obtained preformed object into a prepared die, putting the preformed object into a sintering furnace for sintering, and heating to 280-500 ℃;
step S113, gradually cooling the blank in the sintering material to room temperature in a mold at a set cooling rate to obtain a polytetrafluoroethylene suspension resin blank;
and S115, turning the obtained polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness to obtain the polytetrafluoroethylene suspension resin capable of enhancing the creep resistance weldability.
In conclusion, by means of the technical scheme of the invention, the self-acceleration phenomenon of the polymerization reaction can be effectively controlled by adopting the cooling operation, the modified monomer can be uniformly connected to the main chain of the polymer macromolecule, the content of the modified monomer in the polymer is increased under the condition of the same modified monomer dosage, the creep resistance and the weldability of the resin are enhanced, the basic strength is improved, and the product resin has uniform structure and excellent performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A production process of polytetrafluoroethylene suspension resin is characterized by comprising the following raw material components:
40-60 parts of deionized water, 10-18 parts of tetrafluoroethylene monomer, 2-8 parts of modified monomer, 1-5 parts of initiator, 0.2-1 part of reducing agent, 0.2-1 part of buffer salt and 3-9 parts of composition;
the composition consists of a free radical initiator and a molecular weight promoter, wherein the tetrafluoroethylene monomer is subjected to suspension polymerization under the action of the free radical initiator and the molecular weight promoter;
it is prepared by the following method;
adding deionized water into a reaction kettle, reserving 20-30% of space, adding an initiator and buffer salt, and heating the reaction kettle to 35-55 ℃ to obtain a mixture;
continuing to add the modifying monomer, the reducing agent and the tetrafluoroethylene monomer to the mixture to carry out a polymerization reaction;
after the reaction starts, adding the rest of the modified monomer into the system, continuously adding the rest of the tetrafluoroethylene monomer in the reaction process, and controlling the temperature;
after the reaction is finished, washing, drying and crushing the product to obtain modified polytetrafluoroethylene suspension resin powder;
pressing the obtained polytetrafluoroethylene resin powder into a blank at 10-200 ℃ and 12-64MaP to obtain a pre-formed product;
putting the obtained preformed object into a pre-prepared die, putting the preformed object into a sintering furnace together for sintering, and heating to 280-500 ℃;
gradually cooling the blank in the sintering material to room temperature in a die at a set cooling rate to obtain a polytetrafluoroethylene suspension resin blank;
turning the obtained polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness to obtain the polytetrafluoroethylene suspension resin capable of enhancing the creep-resistant weldability.
2. A process for preparing the suspension resin of PTFE as claimed in claim 1, wherein the molecular weight promoter is perfluorobutylethylene.
3. The process for producing polytetrafluoroethylene suspension resin according to claim 2, wherein the temperature control is: when the feeding amount of the tetrafluoroethylene monomer is 0-18%, controlling the temperature to increase between 40 and 65 ℃, when the feeding amount of the tetrafluoroethylene monomer is 18-78%, keeping the reaction temperature between 50 and 60 ℃, and when the feeding amount of the tetrafluoroethylene monomer is 78-100%, controlling the temperature between 45 and 55 ℃.
4. A polytetrafluoroethylene suspension resin production process according to claim 3, wherein said reducing agent is one or more of sodium sulfite, sodium bisulfite, ferrous sulfate, oxalic acid, and said buffer salt is one or more of sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium phosphate, potassium phosphate, and potassium pyrophosphate.
5. A polytetrafluoroethylene suspension resin production process according to claim 4, wherein said modifying monomer is perfluoropropene, perfluoromethyl vinyl ether or perfluoropropyl vinyl ether, and said organic initiator comprises one or more of succinic acid peroxide and benzoyl peroxide.
6. A process for preparing suspended PTFE resin according to claim 5, wherein the suspension polymerization temperature is 18 to 38 ℃ and the suspension polymerization pressure is 0.5 to 1.5MPa.
7. A polytetrafluoroethylene suspension resin production process according to claim 6, wherein said inorganic initiator comprises one or more of potassium sulfate, sodium persulfate, ammonium persulfate, potassium permanganate-oxalic acid, potassium bromate-sodium sulfite, and potassium bromate-sodium bisulfite.
8. A polytetrafluoroethylene suspension resin production process according to claim 7, wherein the temperature distribution on said preform is uniform, and the temperature difference is controlled within ± 5 ℃; the sintering furnace should have a good thermal insulation so that the cooling rate does not exceed 20 ℃/h when the door is closed for cooling.
9. A process for preparing suspended PTFE resin according to claim 8, wherein the press used in said die casting machine is a fast-rising press with a pressure of 64MPa and a heating furnace.
10. The process for preparing suspended PTFE resin as claimed in claim 9, wherein the mold is a full-pressure mold made of heat-treated NiCr steel, and is heated by hot oil circulation or electric heating.
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| CN202211389047.2A CN115521396A (en) | 2022-11-08 | 2022-11-08 | Production process of polytetrafluoroethylene suspension resin |
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| CN202211389047.2A CN115521396A (en) | 2022-11-08 | 2022-11-08 | Production process of polytetrafluoroethylene suspension resin |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326046A (en) * | 1979-11-30 | 1982-04-20 | Asahi Glass Company, Ltd. | Process for producing modified polytetrafluoroethylene |
| CN102964503A (en) * | 2012-11-16 | 2013-03-13 | 中昊晨光化工研究院有限公司 | Preparation method of modified polytetrafluoroethylene suspension resin |
| CN107778396A (en) * | 2016-08-24 | 2018-03-09 | 中昊晨光化工研究院有限公司 | A kind of polytetrafluoroethylsuspending suspending resin and preparation method thereof |
-
2022
- 2022-11-08 CN CN202211389047.2A patent/CN115521396A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326046A (en) * | 1979-11-30 | 1982-04-20 | Asahi Glass Company, Ltd. | Process for producing modified polytetrafluoroethylene |
| CN102964503A (en) * | 2012-11-16 | 2013-03-13 | 中昊晨光化工研究院有限公司 | Preparation method of modified polytetrafluoroethylene suspension resin |
| CN107778396A (en) * | 2016-08-24 | 2018-03-09 | 中昊晨光化工研究院有限公司 | A kind of polytetrafluoroethylsuspending suspending resin and preparation method thereof |
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