CN106397761A - Fluorination method for end groups of perfluoropolyether acid - Google Patents
Fluorination method for end groups of perfluoropolyether acid Download PDFInfo
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- CN106397761A CN106397761A CN201610802875.2A CN201610802875A CN106397761A CN 106397761 A CN106397761 A CN 106397761A CN 201610802875 A CN201610802875 A CN 201610802875A CN 106397761 A CN106397761 A CN 106397761A
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- pfpe
- gas
- fluorination
- acid
- end group
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- 239000002253 acid Substances 0.000 title claims abstract description 38
- 238000003682 fluorination reaction Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000010702 perfluoropolyether Substances 0.000 title abstract 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000000945 filler Substances 0.000 claims abstract description 19
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 15
- 239000011737 fluorine Substances 0.000 claims abstract description 15
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 5
- 239000010935 stainless steel Substances 0.000 claims abstract description 5
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 239000010962 carbon steel Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000007921 spray Substances 0.000 claims abstract description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 21
- 239000002904 solvent Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- 229910021583 Cobalt(III) fluoride Inorganic materials 0.000 claims description 4
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 claims description 4
- WZJQNLGQTOCWDS-UHFFFAOYSA-K cobalt(iii) fluoride Chemical compound F[Co](F)F WZJQNLGQTOCWDS-UHFFFAOYSA-K 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- PGFXOWRDDHCDTE-UHFFFAOYSA-N hexafluoropropylene oxide Chemical compound FC(F)(F)C1(F)OC1(F)F PGFXOWRDDHCDTE-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- USPWUOFNOTUBAD-UHFFFAOYSA-N 1,2,3,4,5-pentafluoro-6-(trifluoromethyl)benzene Chemical compound FC1=C(F)C(F)=C(C(F)(F)F)C(F)=C1F USPWUOFNOTUBAD-UHFFFAOYSA-N 0.000 claims description 2
- 229910015900 BF3 Inorganic materials 0.000 claims description 2
- 229910018503 SF6 Inorganic materials 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 238000002161 passivation Methods 0.000 claims description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 2
- QHMQWEPBXSHHLH-UHFFFAOYSA-N sulfur tetrafluoride Chemical compound FS(F)(F)F QHMQWEPBXSHHLH-UHFFFAOYSA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 150000001335 aliphatic alkanes Chemical class 0.000 claims 1
- 125000001153 fluoro group Chemical group F* 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 239000006227 byproduct Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000012025 fluorinating agent Substances 0.000 abstract 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 abstract 1
- 238000010924 continuous production Methods 0.000 abstract 1
- 238000003756 stirring Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910021630 Antimony pentafluoride Inorganic materials 0.000 description 1
- 239000002841 Lewis acid Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- YPDSOAPSWYHANB-UHFFFAOYSA-N [N].[F] Chemical compound [N].[F] YPDSOAPSWYHANB-UHFFFAOYSA-N 0.000 description 1
- UNFSTOQHOLDMDB-UHFFFAOYSA-N [N].[F].[F] Chemical compound [N].[F].[F] UNFSTOQHOLDMDB-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006114 decarboxylation reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 150000007517 lewis acids Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000006384 oligomerization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/321—Polymers modified by chemical after-treatment with inorganic compounds
- C08G65/323—Polymers modified by chemical after-treatment with inorganic compounds containing halogens
- C08G65/3233—Molecular halogen
- C08G65/3236—Fluorine
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/321—Polymers modified by chemical after-treatment with inorganic compounds
- C08G65/326—Polymers modified by chemical after-treatment with inorganic compounds containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/321—Polymers modified by chemical after-treatment with inorganic compounds
- C08G65/328—Polymers modified by chemical after-treatment with inorganic compounds containing other elements
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention belongs to the field of fluorine chemical synthesis and particularly relates to a fluorination method for end groups of perfluoropolyether acid. The perfluoropolyether acid and a fluorinating agent are taken as raw materials for synthesis in a gas-liquid contact reaction tube with fluorine gas passivated filler as a filling agent, and the filler adopts one or a mixture of carbon steel, stainless steel 304 and stainless steel 316. The perfluoropolyether acid or a solution thereof sprays downwards from the top of the gas-liquid contact reaction tube, a fluorinating agent gas makes sufficient contact with perfluoropolyether continuously from bottom to top through filler gaps in the gas-liquid contact reaction tube, maximized gas-liquid contact is realized, so that the utilization of the fluorinating agent is realized to the greatest extent, and fluorination of the perfluoropolyether is sufficient and complete. Besides, the perfluoropolyether is subjected to continuous fluorination, the problem of kettle-by-kettle fluorination in the prior art is solved, and the operation procedure is simplified. Few by-products are produced during fluorination of the perfluoropolyether, the operation is simple, continuous production can be realized, reactions are safe and stable, and the method is suitable for industrial mass production and application.
Description
Technical field
The invention belongs to fluorine chemical industry synthesis field is and in particular to a kind of method of fluorination PFPE acid end group.
Background technology
PFPE and its fat are due to big, the excellent antioxidation of its outstanding resistance to thermal extremes performance, operating temperature range
Property and resistance to chemical corrosion, broad material compatibility, outstanding electrical insulation capability, outstanding film property, excellent carrying
Property and greasy property, have in stratospheres such as military project, space flight and nuclear industry and are extremely widely applied.
Either the hexafluoropropylene oxide with Du Pont as representative is raw material anionic polymerisation preparation PFPE acid, or with
The photooxidation method preparation PFPE acid that Su Weiwei represents, the PFPE acid end group of generation all contains active acid fluoride, is
The stability improving PFPE is it is necessary to carry out stabilizing treatment to its end group.The heat stability of end group hydrogenated products is relatively
Low, the PFPE absolute acid stability of end group fluorination is optimal, is the important technology of industrially prepared PFPE.
At present, PFPE acid end group fluorination technology is divided into two classes.One, by fluorization agent AlF3、SbF5Deng strong lewis acid
Prepared by PFPE acid decarboxylation with the PFPE acid of end group fluorination, the catalyst that the method uses is expensive, and is incorporated into
Metallic element in product separates difficulty, and can have a strong impact on product quality；Two, fluorine gas nitrogen mixed gas directly gather to perfluor
Ether acid is fluorinated, and the method fluorization agent utilization rate is relatively low, and general fluoro-gas is more than 10 with the mol ratio of PFPE, and should
Method is mostly intermittent reaction, and utilization rate of equipment and installations is relatively low, and these all considerably increase reaction cost, are unfavorable for commercial production.Cause
This, explore convenient, efficiently fluorination PFPE method become PFPE industrial chain in the urgent need to.
The open CN103111253A of patent discloses one kind makes fluorine gas contact raising fluorination with material by stirring paddle circulation
The reactor of agent utilization rate.Hollow stirring rod and hollow porous stirring paddle can make the fluorization agent gas of material liquid surface upper end pass through
Hollow stirring rod returns in hollow stirring paddle, then is dispersed again in material by the pore of hollow stirring paddle, reaches gas-liquid and connects
Touch and maximize, obtain higher fluorization agent utilization rate.But the method can not carry out continuous fluorination reaction, and consersion unit is multiple
Miscellaneous, maintenance cost is also of a relatively high.
Content of the invention
It is an object of the invention to overcoming batch (-type) synthesis in prior art, and fluorization agent gas effciency is low, and fluorination turns
The low shortcoming of rate, provides a kind of method of fluorination PFPE.
Be employed technical scheme comprise that by realizing the purpose of the present invention：A kind of method of fluorination PFPE acid end group, with
PFPE acid and fluorization agent are raw material, synthesize, institute in the gas-liquid contact reaction pipe as filler for the filler being passivated with fluorine gas
The filler stated is one of carbon steel, stainless steel 304, Stainless steel 316.Gas-liquid contact reaction pipe of the present invention can be existing
There is the conventional device carrying out catalytic reaction for gases and liquids in technology.
Preferably, it is filled with catalyst CoF3 in described filler, the mass content of described CoF3 is 5-10%.
Synthesize adopted following step：The gas-liquid contact reaction pipe that will be filled with catalyst filling is heated to 60-260 DEG C；
Described PFPE acid is from the top spray of described gas-liquid contact reaction pipe is to filler；Gas-liquid contact reaction pipe simultaneously
Bottom is passed through described fluorization agent gas.
The described gas-liquid catalysing tube being filled with catalyst filling is heated to 60-160 DEG C.
Described fluorization agent is in fluorine gas and mixture, sulfur tetrafluoride, sulfur hexafluoride or the boron trifluoride of nitrogen
Kind；The fluorine gas that described fluorization agent produces is 20 with the ratio of the mole of described PFPE：1-1.2：1.
Described PFPE acid is diluted in advance using solvent, and the mass concentration of the PFPE acid after dilution is not little
In 20%；Described solvent is 60 DEG C -160 DEG C containing fluorous solvent for boiling point.
Preferably, the mole of fluorine gas that described fluorization agent produces is 6 with the ratio of the mole of described PFPE：
1-2：1.
Described containing fluorous solvent be PFO, perfluoro-methyl benzene, phenyl-hexafluoride, FC-75 or hexafluoropropylene oxide oligomerization
One of body fluoride K6 or several mixing.
Weight average molecular weight Mw of described PFPE acid is 1000-20000g/mol.
The speed that is passed through of described fluorization agent is 2-4L/min.
Compared with prior art, the invention has the beneficial effects as follows：
In order to solve to be fluorinated the problems during PFPE acid, it is complete that the invention provides a kind of fluorination of end group
Perfluoroalkyl polyether acid method.Using PFPE acid or its solution from top to bottom under the pouring of gas-liquid contact reaction pipe top, fluorization agent gas
Body is constantly fully contacted with PFPE by the filler gap in gas-liquid contact reaction pipe from bottom to top, reaches gas-liquid and connects
Tactile maximization, thus farthest realizing the utilization rate of fluorization agent, and it is abundant, complete to realize PFPE fluorination reaction
Entirely.Additionally, the method carries out continuous fluorination to PFPE, solve the problems, such as must a kettle one kettle to be fluorinated in prior art,
Thus simplifying operation sequence.The method fluorination PFPE by-product is few, simple to operate, can continuously produce, and reaction safety is steady
Determine, be applied to industrial mass production application.
Specific embodiment
In order that those skilled in the art more fully understand technical scheme, implement with reference to optimal
The present invention is described in further detail for example.
Embodiment 1：
The filler through fluorine gas passivation that filling particle diameter in high for internal diameter 15cm 200cm gas-liquid contact reaction pipe is 3mm, this reality
Applying the filler in example is carbon steel, controls temperature to be 60 DEG C, carries out being fluorinated PFPE acid reaction, to be 20% with content of fluorine
Fluorine nitrogen is fluorization agent.With phenyl-hexafluoride as solvent, mass concentration be 50% weight average molecular weight be 8000g/mol PFPE
Acid solution is reaction solution.Fluorine gas mole in fluorine nitrogen is controlled to be the 20 of PFPE:1 carries out fluorination experiment.With 2L/min's
Speed is blown into fluorization agent into the air inlet of catalysis tube reaction bottom, the product collected in the product receiving flask of reaction tube lower end
PFPE content is 89%, does not have other by-products to find.
Other embodiment is similar to Example 1, and implementation condition is shown in Table 1.
In sum, this adopts PFPE acid or its solution from top to bottom under reaction column pouring, and fluorization agent gas is certainly
The lower and upper maximum being constantly fully contacted by the filler gap in reaction tube and PFPE acid, reaching gas-to-liquid contact
Changing, thus farthest realizing the utilization rate of fluorization agent, and realizing PFPE fluorination reaction fully, completely.Additionally, should
Method carries out continuous fluorination to PFPE, solves the problems, such as must a kettle one kettle to be fluorinated, thus simplifying in prior art
Operation sequence.The method fluorination PFPE by-product is few, simple to operate, can continuously produce, and reacts safety and stability, is applied to work
Industry large-scale production and application.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of fluorination PFPE acid end group method it is characterised in that with PFPE acid and fluorization agent as raw material, with
The filler of fluorine gas passivation be filler gas-liquid contact reaction pipe in synthesize, described filler is carbon steel, stainless steel 304, stainless
One of steel 316 or several mixing.
2. the method for fluorination PFPE acid end group according to claim 1 is it is characterised in that fill in described filler
There is catalyst CoF3, the content of described CoF3 is 5-10% for mass fraction.
3. the method for fluorination PFPE acid end group according to claim 1 is it is characterised in that synthesis is adopted following steps
Suddenly：The gas-liquid contact reaction pipe that will be filled with catalyst filling is heated to 60-260 DEG C；Described PFPE acid is from described
The top spray of gas-liquid contact reaction pipe is to filler；The bottom of gas-liquid contact reaction pipe is passed through described fluorization agent gas simultaneously
Body.
4. end group according to claim 3 is fluorinated the method for PFPE acid it is characterised in that described is filled with catalysis
The gas-liquid catalysing tube of agent filler is heated to 60-160 DEG C.
5. end group according to claim 3 is fluorinated the method for PFPE acid it is characterised in that described fluorization agent is fluorine
One of the mixture of gas and nitrogen, sulfur tetrafluoride, sulfur hexafluoride or boron trifluoride；The fluorine gas that described fluorization agent produces
Ratio with the mole of described PFPE is 20：1-1.2：1.
6. end group according to claim 3 is fluorinated the method for PFPE acid it is characterised in that described PFPE is sour
It is diluted in advance using solvent, the mass concentration of the PFPE acid after dilution is not less than 20%；Described containing fluorous solvent
Boiling point is 60 DEG C -160 DEG C.
7. the method for fluorination PFPE end group according to claim 3 is it is characterised in that what described fluorization agent produced
The mole of fluorine gas is 6 with the ratio of the mole of described PFPE：1-2：1.
8. end group according to claim 3 is fluorinated the method for PFPE it is characterised in that described solvent is that perfluor is pungent
One of alkane, perfluoro-methyl benzene, phenyl-hexafluoride, FC-75 or hexafluoropropylene oxide oligomer fluoride K6 or several mixing.
9. end group according to claim 3 is fluorinated the method for PFPE it is characterised in that described PFPE acid
Weight average molecular weight Mw is 1000-20000g/mol.
10. end group according to claim 3 be fluorinated PFPE method it is characterised in that described fluorization agent logical
Entering speed is 2-4L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802875.2A CN106397761B (en) | 2016-09-06 | 2016-09-06 | Process for fluorinating acid end groups of perfluoropolyethers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610802875.2A CN106397761B (en) | 2016-09-06 | 2016-09-06 | Process for fluorinating acid end groups of perfluoropolyethers |
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| Publication Number | Publication Date |
|---|---|
| CN106397761A true CN106397761A (en) | 2017-02-15 |
| CN106397761B CN106397761B (en) | 2021-06-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110054768A (en) * | 2019-05-30 | 2019-07-26 | 上海欧勒奋生物科技有限公司 | A method of improving out-phase contacting efficiency |
| CN110183643A (en) * | 2019-05-30 | 2019-08-30 | 上海欧勒奋生物科技有限公司 | A kind of fluorinated systems of perfluoropolyether unstable end-group |
| CN110467723A (en) * | 2019-08-06 | 2019-11-19 | 湖北卓熙氟化股份有限公司 | A kind of preparation method blocking perfluoro polyether oil |
| CN115246928A (en) * | 2022-06-30 | 2022-10-28 | 成都晨光博达新材料股份有限公司 | Perfluoropolyether oil and preparation process and device thereof |
| CN116426024A (en) * | 2023-06-14 | 2023-07-14 | 上海森桓新材料科技有限公司 | Method for passivating end group of fluorine elastomer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110054768A (en) * | 2019-05-30 | 2019-07-26 | 上海欧勒奋生物科技有限公司 | A method of improving out-phase contacting efficiency |
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| CN110183643B (en) * | 2019-05-30 | 2021-12-14 | 上海欧勒奋生物科技有限公司 | Fluorination system of unstable terminal group of perfluoropolyether |
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| CN110467723A (en) * | 2019-08-06 | 2019-11-19 | 湖北卓熙氟化股份有限公司 | A kind of preparation method blocking perfluoro polyether oil |
| CN110467723B (en) * | 2019-08-06 | 2021-11-30 | 湖北卓熙氟化股份有限公司 | Preparation method of end-capped perfluoropolyether oil |
| CN115246928A (en) * | 2022-06-30 | 2022-10-28 | 成都晨光博达新材料股份有限公司 | Perfluoropolyether oil and preparation process and device thereof |
| CN116426024A (en) * | 2023-06-14 | 2023-07-14 | 上海森桓新材料科技有限公司 | Method for passivating end group of fluorine elastomer |
| CN116426024B (en) * | 2023-06-14 | 2023-08-18 | 上海森桓新材料科技有限公司 | Method for passivating end group of fluorine elastomer |
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| Publication number | Publication date |
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| CN106397761B (en) | 2021-06-18 |
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