WO2005033150A1 - 含フッ素重合体組成物製造方法及び含フッ素重合体組成物 - Google Patents
含フッ素重合体組成物製造方法及び含フッ素重合体組成物 Download PDFInfo
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- WO2005033150A1 WO2005033150A1 PCT/JP2004/014391 JP2004014391W WO2005033150A1 WO 2005033150 A1 WO2005033150 A1 WO 2005033150A1 JP 2004014391 W JP2004014391 W JP 2004014391W WO 2005033150 A1 WO2005033150 A1 WO 2005033150A1
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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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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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
- C08F14/00—Homopolymers and 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
- C08F14/18—Monomers containing fluorine
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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
- C08F6/00—Post-polymerisation treatments
- C08F6/14—Treatment of polymer emulsions
- C08F6/16—Purification
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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
- C08F8/00—Chemical modification by after-treatment
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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
Definitions
- the present invention relates to a method for producing a fluoropolymer composition and a fluoropolymer composition.
- n is an integer of 13 and M is a monovalent cation.
- a production method comprising polymerizing the surfactant in an aqueous medium using the surfactant as a dispersant (for example, Patent Documents 1 and 2). See Patent Documents 2, 3, and 4).
- Patent Document 5 describes a method relating to a fluoropolymer obtained by polymerization using perfluorocarboxylic acid as a dispersant, and uses a compound having a CH bond as a surfactant. If you do, it will be listed at all!
- Patent Document 1 JP-A-51-057790
- Patent Document 2 US Pat. No. 5,688,844
- Patent Document 3 US Pat. No. 5,789,508
- Patent Document 4 US Patent Application Publication No. 02Z0037985
- Patent Document 5 JP-A-11-181098
- an object of the present invention is to provide a method for producing a composition comprising a fluoropolymer which is not colored by molding, and a fluoropolymer composition produced by the production method. It is in.
- the present invention provides a fluorine-containing polymer composition comprising a fluorine-containing polymer (B) by contacting an oxidizing agent with a polymerization product comprising the fluorine-containing polymer (A) and a fluorine-containing surfactant.
- the present invention provides a fluorinated polymer obtained by contacting a polymerization product comprising a fluorinated polymer (A) obtained by polymerization in an aqueous medium with a fluorinated surfactant with an oxidizing agent.
- a method for producing a fluoropolymer composition for producing a fluoropolymer composition comprising (B), wherein the fluorosurfactant comprises (i) a hydrophobic group having a CH bond and a CF bond; ) — COOM SO M OSO M PO (OM) and (— O) — PO (OM)
- M represents NHLiNaK or H
- x (3-y)
- y represents 1 or 2.
- the present invention provides a method for producing a fluoropolymer composition, which is a partially fluorinated compound which is formed by bonding to one selected hydrophilic group.
- the present invention is a fluoropolymer composition produced by each of the above fluoropolymer composition production methods, wherein the fluoropolymer composition comprises an aqueous dispersion, a slurry, a dry powder, A fluorine-containing polymer composition, which is a granular powder or a molded product obtained using the aqueous dispersion, the slurry, the dry powder, or the granulated powder.
- the present invention will be described in detail.
- the first process for producing a fluoropolymer composition of the present invention comprises the steps of: contacting an oxidizing agent with a polymerization product comprising the fluoropolymer (A) and a fluorosurfactant, This is for producing a fluoropolymer composition comprising (B).
- the “fluorinated polymer (B)” is derived from the fluorinated polymer (A), and is obtained after contacting the polymerization product with an oxidizing agent.
- the fluoropolymer (A) undergoes a chemical change by the oxidizing agent
- the fluoropolymer (B) undergoes a chemical change by the oxidizing agent.
- the fluorinated polymer (A) is not particularly limited as having undergone a chemical change by the above-mentioned oxidizing agent, and examples thereof include COOH formed by polymerization and the like on the polymer chain of the fluorinated polymer (A). And those in which the unstable terminal group and Z or carbon-carbon double bond are decomposed by the above-mentioned oxidizing agent.
- the fluorinated polymer (A) will be described later.
- the above “polymerization product” is a raw material for producing a fluoropolymer composition described later.
- a fluorinated polymer composition is produced by performing a treatment of bringing the above-mentioned polymerization product into contact with an oxidizing agent.
- the ⁇ polymerization product '' is also a fluorine-containing polymer (A)
- the fluorinated polymer (A) is a product of a polymerization reaction. It is referred to as “polymerization product” for convenience to distinguish it from the above-mentioned fluoropolymer composition.
- polymerization product refers to, for example, (1) a fluorine-containing polymer (A) if it comprises the fluorine-containing polymer (A) and a fluorine-containing surfactant.
- the polymerization reaction product obtained after the completion of the polymerization reaction for producing A) may be used, or (2) the polymerization reaction product may be concentrated, dispersed and stabilized, coagulated, aggregated, dried, and granulated.
- a post-polymerized product obtained by performing post-treatment such as (3) adding a fluorine-based surfactant to the previously prepared polymerization reaction product or the post-polymerized product.
- Post-dispersion prepared by dispersing in an aqueous medium, or (4) post-treatment such as concentration, coagulation, aggregation, drying, and granulation is performed on the post-preparation disposable. It may be a post-prepared product obtained as a result.
- the post-prepared disposable as described in (3) above is used when polymerizing the fluoropolymer (A). It does not need to use a nitrogen-based surfactant.
- Examples of the post-prepared dispersion prepared in the above (3) and the post-prepared processed product in the above (4) include those containing 0.0001 to 5 parts by mass of a fluorine-based surfactant per 100 parts by mass of the fluoropolymer (A). Is preferred.
- a more preferred lower limit of the content of the fluorosurfactant per 100 parts by mass of the fluoropolymer (A) is 0.001 part by mass, a still more preferred lower limit is 0.01 part by mass, and a more preferred upper limit is , 2 parts by mass, and a more preferred upper limit is 1 part by mass.
- the above-mentioned polymerization product is more preferably the above-mentioned polymerization reaction product of (2), which is preferably the above-mentioned polymerization reaction product or the above-mentioned polymerization reaction product of (2).
- the polymerization reaction product of the above (1) and the post-polymerized product of the above (2) are usually obtained by polymerizing the fluorinated polymer (A) in the presence of a fluorinated surfactant, and are preferably used. Is a polymerization product in the second fluoropolymer composition production method of the present invention described below.
- the second method for producing a fluoropolymer composition according to the present invention provides a polymerization product comprising a fluoropolymer (A) obtained by polymerization in an aqueous medium using a fluorosurfactant. It consists of contacting an oxidizing agent with the oxidizing agent.
- the "aqueous medium” is a reaction medium for performing polymerization, and is a liquid containing water.
- the aqueous medium is not particularly limited as long as it contains water.
- the aqueous medium contains, for example, a fluorine-free organic solvent such as alcohol, ether, ketone, and paraffin wax and / or a fluorine-containing organic solvent. It may be.
- the polymerization is not particularly limited as long as the polymerization is carried out in an aqueous medium using the above-mentioned fluorine-containing surfactant.
- the polymerization can be carried out by a known polymerization method such as suspension polymerization or emulsion polymerization using the above-mentioned fluorine-based surfactant, polymerization initiator and monomer.
- a known polymerization method such as suspension polymerization or emulsion polymerization using the above-mentioned fluorine-based surfactant, polymerization initiator and monomer.
- known additives such as a chain transfer agent and a radical scavenger can be added.
- reaction conditions such as polymerization temperature and polymerization pressure can be appropriately set according to the type of polymerization method, monomer, desired fluoropolymer, and the like.
- TFE tetrafluoroethylene
- the amount of the fluorosurfactant to be added is appropriately determined depending on the type of the monomer used, the molecular weight of the target polymer, and the like.
- the total amount of the fluorosurfactant added during the polymerization is preferably 0.0001% by mass or more of the aqueous medium in view of obtaining a sufficient dispersing power, and in view of the production cost and the polymerization reactivity. % By mass or less is preferred.
- a more preferred lower limit of the total amount of the above-mentioned fluorosurfactants is 0.001% by mass, a more preferred upper limit is 2% by mass, and a still more preferred upper limit is 1% by mass.
- the amount of the above-mentioned monomer to be added is appropriately determined depending on the molecular weight and the production amount of the intended fluoropolymer.
- the above-mentioned monomer is preferably added in an amount of 10% by mass or more of the aqueous medium in total in terms of economy and productivity. From the viewpoint of stabilizing the system, it is preferable to add it in an amount of 150% by mass or less. A more preferred lower limit of the addition amount is 20% by mass, a more preferred upper limit is 100% by mass, and a still more preferred upper limit is 70% by mass.
- the polymerization initiator is not particularly limited as long as it can generate a radical in the polymerization, and a known oil-soluble, Z- or water-soluble polymerization initiator can be used. Further, the polymerization can be started as redox in combination with a reducing agent or the like. The concentration of the polymerization initiator is appropriately determined depending on the type of the monomer, the molecular weight of the target polymer, and the reaction rate.
- the polymerization product may be an aqueous dispersion obtained by performing the above-mentioned polymerization, or the aqueous dispersion May be obtained by concentrating or dispersing a dispersion in a known manner, and subjecting the aqueous dispersion or the dispurgeon to coagulation or coagulation to collect.
- a slurry (wet powder) may be used, or a dry powder obtained by drying the slurry may be used, and, if desired, granulation obtained by granulating the dry powder. It may be a powder.
- the slurry, or the dry powder which is preferably the spargyon, the slurry, or the dry powder, is more preferable.
- the polymerization product depends on the amount added in the polymer, but is usually a fluorine-based interface per 100 parts by mass of the fluoropolymer (A). Those containing 0.0001 to 5 parts by mass of an activator are preferred.
- a more preferred lower limit of the content of the fluorosurfactant per 100 parts by mass of the fluoropolymer (A) is 0.001 part by mass, and a still more preferred lower limit is 0.01 part by mass, and a more preferred upper limit. Is 2 parts by mass, and a more preferred upper limit is 1 part by mass.
- the fluorine-based surfactant includes (i) a hydrophobic group having a CH bond and a CF bond, (ii) —COOM, —SOM, —OSOM, —PO (OM), and (—O ) — PO (OM) [where M is N
- It is composed of a partially fluorinated compound formed by bonding with one kind of hydrophilic group selected from the above.
- the “partially fluorinated” means that the compound has a structural force having a C—H bond and a C—F bond.
- the above-mentioned partially fluorinated compound is a compound obtained by bonding the above-mentioned hydrophobic group (i) and the above-mentioned hydrophilic group (ii), and is therefore preferred as a surfactant U, and emulsifying action and dispersion of the fluoropolymer. Has an action.
- the hydrophobic group in the above (i) is not particularly limited as long as it has a CH bond and a CF bond, and includes a hetero atom other than C, H or F, for example, 0, N and Z or S. It may have the main chain.
- the hydrophobic group (i) may be a straight-chain group or a group having a branched chain.
- the carbon atom bonded to the hydrophilic group may be any of a primary carbon atom, a secondary carbon atom, and a tertiary carbon atom.
- the hydrophobic group of the above (i) has or has ether oxygen in the main chain, and is preferably a partially fluorinated alkyl group! /.
- the above partially fluorinated alkyl group is preferably one having 3 to 18 carbon atoms.
- the more preferable lower limit of the number of carbon atoms is 4, the more preferable lower limit is 6, the more preferable upper limit is 12, and the one having 8 carbon atoms is particularly preferable.
- the hydrophobic group (i) preferably has CFX— (X represents F or H) in the main chain, and preferably has CH in the main chain. What is more preferable.
- the above partially fluorinated compound has a large number of CH structures in the hydrophobic group of the above (i).
- the method for producing a fluoropolymer composition of the present invention is characterized in that the hydrophobic chain of (i) has two or more hydrophobic groups in the main chain.
- the hydrophobic group (i) has or has ether oxygen in the main chain. /, A partially fluorinated alkyl group having CH— in the main chain is more preferable.
- More preferred hydrophobic groups of the above (i) include, for example, those represented by the general formula (i I)
- a preferred lower limit of q is 4 and a preferred upper limit of q is 10 and a more preferred upper limit is 6.
- hydrophobic group of the above (i I) for example, a group represented by the following formula (i 1), formula (i 2), formula (i 3) or formula (i 4) (hereinafter referred to as the present specification)
- the above groups are collectively referred to as “partially fluorinated alkyl group (T)”).
- the partially fluorinated compound in the method for producing a fluoropolymer composition of the present invention is a compound represented by the formula (i1), the formula (i2), the formula (i3) or the formula (i) as the hydrophobic group of the above (i). i It may be an aggregate of molecules having any one of the four groups represented by 4), or a molecule having any one of these four groups may be combined with another species. It may be a mixture with molecules that have!
- the partially fluorinated compound is a partially fluorinated compound (b) represented by the following general formula (lb) and has two or more hydrophobic groups A in one molecule, the above one molecule
- the two or more hydrophobic groups in the above may have only one of the above four groups, or may have two or more of the above four groups It may be.
- the partially fluorinated compound in the method for producing a fluoropolymer composition of the present invention has a structure in which two or more of the above four groups are used as the hydrophobic group of the above (i) in a molecule aggregate or one molecule. From the viewpoint of easy preparation, those in which the terminal of the two or more groups is only H or only F are preferable!
- the partially fluorinated compound may be a reaction product as it is, and the partially fluorinated compound as a reaction product may be an aggregate of molecules or a single molecule. Usually, it has two or more of the above four groups.
- hydrophilic group of the above (ii) is COOM SO M OSO M PO (OM) and (1-O) -P
- the hydrophilic group of the above (ii) includes COOM SO M and OS in terms of emulsifying power and dispersing power. OM is preferred—COOM and SOM are more preferred.
- NH is preferred as the above M because it can be easily removed by heat treatment after polymerization.
- Li, Na, and K are preferred in terms of emulsifying power and dispersing power.
- the partially fluorinated compound may be any one as long as the hydrophobic group of (i) and the hydrophilic group of (ii) are bonded.
- the compound may be a betain compound, but from the viewpoint of emulsifying power and dispersing power, it is preferable that the compound is an aeronotropic compound.
- the above partially fluorinated compound has the following general formula (la)
- A represents the hydrophobic group of the above (i)
- Q represents -COOM, -SOM or -OSOM.
- A represents the above-mentioned hydrophobic group, and z represents 0 or 1.
- x, y, and M are the same as defined above for the hydrophilic group in (ii).
- a partially fluorinated compound (a) is preferable in view of emulsifying power and dispersing power.
- Rf 1 represents a perfluoroalkylene group having 2 to 12 carbon atoms
- n3 represents an integer of 1 to 6
- Q represents the above general formula.
- the partially fluorinated alkylene-one conjugated compound (al) represented by) is preferred.
- X is preferably F.
- the preferred lower limit of the number of carbon atoms of Rf 1 is 4, the preferred upper limit is 10, and the more preferred upper limit is 6.
- the preferable upper limit of n3 is 3, and the more preferable upper limit is 3. Is 2.
- X—Rf 1 — (CH 2) represents the above-mentioned partially fluorinated alkyl
- the Q is preferably —COOM or —SOM.
- the partially fluorinated alkylene anionic compound (al) has the following general formula (2) in terms of emulsifying power and dispersing power.
- Rf represents a perfluoroalkyl group having 2 to 12 carbon atoms
- nl represents an integer of 1 to 6
- Q is the same as defined in the above general formula (la).
- the preferred lower limit of the number of carbon atoms of Rf is 4, the preferred upper limit is 10, and the more preferred upper limit is 6.
- the preferred upper limit of nl is 3, and the more preferred upper limit is 2.
- the preferred lower limit of m is 4, the preferred upper limit is 10, and the more preferred upper limit is 6.
- the above n2 is preferred! /, The upper limit is 3, and the more preferred! /, The upper limit is 2.
- the partially fluorinated compound (a) also includes the following general formula (la-2)
- N4 represents an integer of 13;
- Rf 2 represents a perfluoroalkylene group or an oxyalkylene group having 318 carbon atoms.
- Rf 3 Represents a linear or branched perfluoroalkylene group having 1 to 4 carbon atoms. Same as defined in (la). )) May be the partially fluorinated alkylene-one conjugated product (a2).
- X is preferably F.
- the preferred lower limit of the number of carbon atoms in Rf 2 is 4, and the preferred upper limit is 6.
- the preferred lower limit of the number of carbon atoms of Rf 3 is 2, and the preferred upper limit is 3.
- n4 is 2.
- X—Rf 2 — (CH 2 ) represents the above-mentioned partially fluorinated alkyl
- Q is preferably COOM (M is the same as defined for the hydrophilic group in (ii) above).
- the partially fluorinated alkylene anionic compound (a2) has the following emulsifying power and dispersing power:
- the one represented by is preferred.
- the above partially fluorinated compound (a) also includes the following general formula (la-3)
- X 1 and X 2 are the same or different and represent H or F.
- Rf 4 and Rf 5 are the same or different and are an alkylene group having 1 or more carbon atoms and having at least one fluorine atom.
- N5 and n6 are the same or different and each represent an integer of 13.
- Q is the same as defined in the above general formula (la).)
- the object (a3) may be used.
- X 1 and X 2 each be F.
- the preferred lower limit of the number of carbon atoms in Rf 4 and Rf 5 is 2, and the preferred upper limit is 4.
- X ⁇ Rf ⁇ CH) and (CH) Rf 5 —X 2 are the same
- One or different is preferably any of the above-mentioned partially fluorinated alkyl groups (T).
- the preferred upper limit of n5 and n6 is 2.
- Q is SOM or COOM (M is
- the one represented by is preferred.
- the “fluorine-containing polymer” is a polymer having a fluorine atom bonded to a carbon atom.
- the fluorine-containing polymer is obtained by polymerizing one or more kinds of fluorine-containing monomers, but does not impair the basic performance as a fluorine-containing polymer. In the range, it may be obtained by copolymerizing a fluorine-free monomer also!
- the "fluorine-containing monomer” is a monomer having at least one fluorine atom bonded to a carbon atom.
- the “fluorine-containing monomer” is not particularly limited as long as it is a known one, but preferably has 118 carbon atoms.
- fluorine-containing monomer examples include fluorinated olefin, cyclic fluorinated monomer, and fluorinated alkylbutyl ether.
- fluorofluorin examples include, for example, tetrafluoroethylene [TFE], hexafluoropropylene [HFP], butyl fluoride, bilidene fluoride [VDF], trifluoroethylene, and hexane.
- TFE tetrafluoroethylene
- HFP hexafluoropropylene
- VDF bilidene fluoride
- trifluoroethylene hexane.
- Fluoroisobutylene, perfluorobutylethylene and the like are preferred, and those having 2 to 6 carbon atoms are preferred!
- Examples of the cyclic fluorinated monomer include perfluoro-2,2-dimethyl-1,3-dioxole [PDD] and perfluoro-2-methylene 4-methyl-1,3-dioxolane [PM
- fluorine alkyl butyl ether examples include perfluoro (methyl butyl ether) [PMVE], perfluoro (ethyl butyl ether) [PEVE], and perfluoro (propyl butyl ether) [PPVE].
- the fluorine-free monomer is not particularly limited as long as it has copolymerizability with the fluorine-containing monomer, and examples thereof include hydrocarbon monomers.
- the hydrocarbon monomer may have a halogen atom other than fluorine, elements such as oxygen and nitrogen, and various substituents.
- hydrocarbon monomer examples include alkenes, alkyl butyl ethers, butyl esters, alkylaryl ethers, alkylaryl esters and the like.
- substituents examples include a hydroxyl group, a carboxyl group, a cyano group, a glycidyl group, an amino group, an amide group, and an aromatic substituent.
- the obtained fluoropolymer (A) is a single perfluoropolymer, it has excellent physical properties such as heat resistance and is easy to handle. Is more preferable.
- the above-mentioned fluoropolymer is not particularly limited, and examples thereof include a non-melt-processable fluoropolymer, a melt-processable fluoropolymer, and an elastomer. Copolymers and the like.
- non-melt-processable fluoropolymer examples include a TFE homopolymer, a modified polytetrafluoroethylene [modified PTFE], and the like.
- modified PTFEJ means a copolymer of TFE and a small amount of monomer other than TFE, which is non-melt-processable.
- trace monomer examples include the above-mentioned perfluoroolefin, fluoro (alkyl vinyl ether), cyclic fluorinated monomer, and perfluoro (alkyl ethylene). ) And the like.
- the content of the trace monomer units derived from the trace monomers in the total monomer units is usually in the range of 0.001 to 2 mol%.
- the "monomer unit” such as the above-mentioned trace monomer unit is a part of the molecular structure of the fluoropolymer and is derived from the corresponding monomer. Means part.
- the TFE unit is a part on the molecular structure of the fluoropolymer and is a part derived from TFE, and is represented by-(CF-CF)-.
- the above "all monomer units” is a fluoropolymer
- the term “content (mol%) of the minor monomer unit in the total monomer units” refers to the monomer derived from the “all monomer units”, It means the mole fraction (mole%) of the trace monomer derived from the trace monomer unit in the total amount of the monomers constituting the fluoropolymer.
- melt-processable fluoropolymer examples include ethylene ZTFE copolymer [ETF E], TFEZHFP copolymer [FEP], TFEZ perfluoro (alkylbutyl ether) copolymer [TFEZPAVE copolymer]. And the like.
- TFEZPAVE copolymer examples include a TFEZPMVE copolymer [MFA], a T FEZPEVE copolymer, and a TFEZPPVE copolymer. Among them, MFA and a T FEZPPVE copolymer are preferred. Polymers are more preferred!
- Examples of the elastomeric copolymer include TFEZ propylene copolymer, HFPZ ethylene copolymer, HFPZ ethylene ZTFE copolymer, PVDF, VDFZHFP copolymer, HF PZ ethylene copolymer, VDFZTFEZHFP copolymer and the like. Is mentioned.
- the fluoropolymer (A) is preferably a perfluoropolymer in terms of excellent heat resistance and the like, and easy to process.
- a perfluoropolymer TFE homopolymer, modified PTFE, FEP, MFA, TFEZPEVE copolymer, and TFEZPPVE copolymer are preferred, and TFE homopolymer, modified PTFE, FEP and TFEZPPVE copolymer are preferred. More preferred.
- the fluoropolymer (A) can have a desired molecular weight or composition by appropriately setting the polymerization reaction conditions, the amount of monomer added, and the like.
- the process for producing a fluoropolymer composition of the present invention comprises contacting an oxidizing agent with a polymerization product comprising the above fluoropolymer (A) and a fluorosurfactant.
- the polymerization product may be a low-molecular-weight product (oligomer) having a number-average molecular weight of less than 1000, such as the above-mentioned fluorosurfactant, as long as it contains the fluoropolymer (A) in an amount of 119% by mass. It may contain a surfactant, a polymerization initiator, a coagulant, an aqueous medium and the like.
- the lower limit of the fluoropolymer (A) is preferably 10% by mass, and the upper limit is preferably 70% by mass.
- the lower limit of the fluoropolymer (A) is preferably 70% by mass, and the upper limit is preferably 90% by mass.
- the oxidizing agent may oxidize and decompose the above-mentioned low-molecular-weight product (oligomer) having a number average molecular weight of less than 1000, a surfactant such as the above-mentioned fluorine-based surfactant, a polymerization initiator, and a coagulant.
- the material is not particularly limited as long as it is at least one selected from the group consisting of hypochlorous acid, chlorine, ozone, and hydrogen peroxide. Of these, hypochlorous acid, chlorine and hydrogen peroxide are preferred.
- one or more of the oxidants may be used.
- the contact may be performed, for example, by (I) a method of diffusing the oxidizing agent as a gas into the polymerization product, or (II) a method of mixing the oxidizing agent as a liquid with the polymerization product. it can.
- the conditions for the contact can be appropriately set depending on the composition and amount of the polymerization product used, the type of the oxidizing agent, and the like.
- the polymerization product is formed of a slurry or a dry powder because the polymerization product has a large contact area with the oxidant and is easily diffused. Preferably, there is.
- the dry powder obtained by drying the slurry or the dry powder may be a molding powder obtained by suspension polymerization or a fine powder obtained by emulsion polymerization.
- the above method (I) is usually preferably carried out at a temperature of 30 to 300 ° C in view of the reactivity of the oxidizing agent.
- the preferred lower limit of the temperature is 100 ° C, and the preferred upper limit is 250 ° C.
- the melting point of the fluoropolymer (A) is increased in that the diffusion rate of the oxidizing agent is increased.
- the contact is performed at a lower temperature.
- the oxidizing agent is preferably used as a mixed gas with an inert gas such as air, nitrogen, and helium from the viewpoint of safety.
- the oxidizing agent is preferably used in an amount of 0.1 to 30% by mass based on the total amount of the mixed gas, depending on the type of the oxidizing agent used.
- the oxidizing agent may be added in the entire amount used before the start of the contact, or may be added sequentially from the start of the contact.
- the addition rate can be appropriately set according to the composition and the amount of the polymerization product to be brought into contact.
- the method (I) is usually preferably performed for 3 to 24 hours.
- the above method (I) is more preferably performed in 4 hours or more from the viewpoint of obtaining the desired effect of preventing coloration, and is more preferably performed in 20 hours or less in terms of production cost and suppression of side reactions.
- the polymerization product may be an aqueous dispersion such as an aqueous dispersion or a dispersion, because the oxidizing agent can be efficiently contacted. preferable.
- the above method ( ⁇ ⁇ ) is usually preferably performed at a temperature of 10 to 100 ° C. in view of the reactivity of the oxidizing agent.
- the preferred lower limit of the above temperature is 20 ° C from the viewpoint of the reactivity of the oxidizing agent, and the preferred upper limit is 85 ° C from the viewpoint of safety and suppression of side reactions.
- the oxidizing agent is usually preferably used in an amount of 0.01 to 5% by mass of the polymerization product.
- the oxidizing agent is preferably used in an amount of 0.1% by mass or more of the polymerization product from the viewpoint of obtaining a desired coloring prevention effect. More preferably, it is used in an amount of not more than mass%.
- the method (I) is usually performed for one to 24 hours.
- the above method ( ⁇ ) is more preferable to be carried out in 2 hours or more in view of obtaining a desired coloring prevention effect. From the viewpoint of suppression of reaction, it is more preferable to perform the reaction within 20 hours.
- the oxidizing agent may be added in the entire amount used before the start of the contact, or may be added sequentially from the start of the contact.
- the rate of addition can be appropriately set according to the composition and amount of the polymerization product to be brought into contact.
- the process for producing a fluoropolymer composition of the present invention involves producing a fluoropolymer composition through a step of bringing an oxidizing agent into contact with the above-mentioned polymerization product.
- the fluoropolymer composition is a composition comprising the fluoropolymer (B).
- the fluorinated polymer composition may be in the same form as the polymerization product used, that is, any of an aqueous dispersion, a dispurgeon, a slurry, a dry powder or a granulated powder. It may be a molded product obtained by a molding process.
- the molded article as the above-mentioned fluoropolymer composition may be hereinafter referred to as “fluoropolymer molded article” in this specification.
- the "fluorinated polymer molded article” is obtained by bringing a polymerization product into contact with the oxidizing agent and performing molding. In the molding process, heating is performed at a high temperature such as the melting point of the fluoropolymer (B) or more depending on the type of the target fluoropolymer molded product. The method may not be performed.
- the shape of the fluoropolymer molded article is not particularly limited.
- the fluoropolymer molded article is obtained by (a) bringing the oxidizing agent into contact with a slurry, a dry powder, or a granulated powder as a polymerization product and melt-kneading the mixture using a kneader or the like. Pellets, (b) the fluorinated polymer (B) obtained by contacting the oxidizing agent, or (a) The pellets, slurries, dried powders or granulated powders obtained by the above are charged into a molding machine and molded, and the above-mentioned oxidizing agent is added to (C) an aqueous dispersion or dispersion as a polymerization product.
- the coating of the above (c) is a process power of applying to the object to be coated, drying if necessary, and firing at a temperature not lower than the melting point of the fluoropolymer.
- the production of the pellet, the production of the molded article, the production of the coating, the impregnation processing, and the cast film formation may be collectively referred to as “molding processing”.
- the above-mentioned fluoropolymer molded article is brought into contact with the above-mentioned oxidizing agent, followed by molding.
- the polymerization product (B) is an aqueous dispersion or dispurgeon, after contact with the above-mentioned oxidizing agent, a powder or paste is prepared by coagulation, etc. It can be obtained from the shape.
- the above-mentioned molding can be appropriately performed by a known method.
- the method for producing the pellets is not particularly limited.For example, a method for producing pellets by putting a powder comprising a fluoropolymer into a kneader or an extruder and melt-kneading the same. And the like.
- the method for producing the molded article is not particularly limited, and examples thereof include compression molding, extrusion molding, first extrusion molding, and injection molding.
- the method for applying the coating is not particularly limited, and examples thereof include spray coating, dip coating, brush coating, and electrostatic coating.
- the conditions for the molding process can be appropriately set according to the type of the molding process, the composition and the amount of the polymerization product to be molded, and the like.
- the fluoropolymer produced by the above-described method for producing a fluoropolymer composition of the present invention The composition is also one of the present invention.
- the fluoropolymer composition of the present invention may be an aqueous dispersion, a slurry, a dry powder, or a granulated powder, or may be an aqueous dispersion, the slurry, the dry powder, or the granulated powder.
- a molded article obtained by using a powder may be used.
- the fluoropolymer composition of the present invention is produced by the above-mentioned method of producing a fluoropolymer composition of the present invention, it is not colored during molding and has an excellent appearance.
- the Y value power of the XYZ color system may be 0 or more and less than 100. Preferred,.
- the Y value in the XYZ color system is an index representing brightness, and is a value equal to the luminous reflectance or luminous transmittance of an object.
- the Y value of the XYZ color system is a percentage (%) of the Y value obtained by measurement using a color difference meter CR-300 (manufactured by Minolta) at room temperature according to the CIE1931 color system. %).
- the more preferable lower limit of the Y value in the XYZ color system is 50, and the more preferable lower limit is 60.
- the fluoropolymer composition of the present invention When the fluoropolymer composition of the present invention is a molded article, it has a Y value in the XYZ color system within the above range, and therefore has high whiteness and no coloring, and thus has excellent appearance.
- the fluoropolymer composition of the present invention is produced by the above fluoropolymer composition manufacturing method, the whiteness is high and there is no coloring.
- Y value (XYZ color system): Measured at room temperature using a colorimeter CR-300 (manufactured by Minolta) in accordance with the CIE1931 color system.
- Average primary particle size Dilute the solid content to about 0.02% by mass, and plot the calibration curve between the transmittance of 55 Onm projected light per unit length and the average particle size determined by electron micrograph. Based on the above, it was indirectly determined from the above transmittance.
- Standard specific gravity Measured in accordance with ASTM D-145769.
- the pressure was adjusted to 0.78 MPaG, TFE was injected, and 5 g of a 0.6% by mass aqueous solution of ammonium persulfate [APS] was charged to start the reaction.
- TFE was continuously added to maintain the internal pressure at 0.78 MPaG, and the reaction was continued.
- 11 hours after the start of the polymerization TFE was purged to terminate the polymerization.
- the solid content concentration and the average primary particle diameter of the obtained TFE homopolymer aqueous dispersion were measured.
- Table 1 shows the measurement results of the molded articles obtained in the respective synthesis examples.
- the surfactant concentration and solids concentration are values calculated based on the obtained TFE homopolymer aqueous dispersion.
- the aqueous dispersion was flocculated by mechanical stirring at 500 rpm, the water was filtered off, washed again with 50 Oml of ion-exchanged water, dried at 180 ° C for 6 hours, and the TFE single weight A coalesced fine powder was obtained.
- a molded body was obtained from the obtained fine powder according to ASTM D-145769. The SSG and Y value of the obtained molded body were measured.
- a molded product was obtained in the same manner as in Example 1 except that 300 g of the aqueous TFE homopolymer dispersion obtained in Synthesis Example 1 and 200 g of ion-exchanged water were diluted in a 1000-ml three-necked flask equipped with stirring blades. The SSG and Y value of the obtained molded body were measured.
- Comparative Example 1 After diluting 143 g of the TFE homopolymer aqueous dispersion obtained in Synthesis Example 1 and 357 g of ion-exchanged water in a 1000 ml three-necked flask equipped with stirring blades, the aqueous dispersion was coagulated by mechanical stirring at 500 rpm. After filtering off the water, it was washed again with 500 ml of ion-exchanged water and dried at 180 ° C. for 6 hours to obtain a fine PTFE powder. A molded product was obtained from the obtained fine powder in accordance with ASTM D-145769. The SSG and Y value of the obtained molded body were measured.
- a molded article was prepared in the same manner as in Comparative Example 1 except that the aqueous dispersion of TFE homopolymer obtained in Synthesis Example 2 was used instead of the aqueous dispersion of TFE homopolymer obtained in Synthesis Example 1. And Y values were measured.
- Table 2 shows the measurement results of the molded bodies obtained in each of the examples and comparative examples.
- the method for producing a fluoropolymer composition of the present invention can provide a fluoropolymer composition having an excellent appearance without coloring.
- the fluoropolymer composition of the present invention is produced by the above-mentioned fluoropolymer composition production method, it has high whiteness and no coloring, so that it can be used as various coatings and molded articles requiring aesthetic appearance. Useful.
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Cited By (13)
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US7989568B2 (en) | 2008-11-13 | 2011-08-02 | E.I. Du Pont De Nemours And Company | Fluorosulfonates |
US8461378B2 (en) | 2010-09-10 | 2013-06-11 | E.I. Du Pont De Nemours And Company | Purification of fluoroalkanesulfonate salts |
WO2013169564A1 (en) * | 2012-05-09 | 2013-11-14 | E. I. Du Pont De Nemours And Company | Fluoropolymer dispersion treatment employing hydrogen peroxide to reduce fluoropolymer resin discoloration |
US20130303718A1 (en) * | 2012-05-09 | 2013-11-14 | E I Du Pont De Nemours And Company | Fluoropolymer Dispersion Treatment Employing Oxidizing Agent to Reduce Fluoropolymer Resin Discoloration |
US20130303716A1 (en) * | 2012-05-09 | 2013-11-14 | E I Du Pont De Nemours And Company | Drying Wet Fluoropolymer Resin and Exposing to Oxygen Source to Reduce Discoloration |
US20130303715A1 (en) * | 2012-05-09 | 2013-11-14 | E I Du Pont De Nemours And Company | Fluoropolymer Resin Treatment Employing Heating and Oxygen Source to Reduce Discoloration |
US20130303709A1 (en) * | 2012-05-09 | 2013-11-14 | E I Du Pont De Nemours And Company | Fluoropolymer Dispersion Treatment Employing High pH and Oxygen Source to Reduce Fluoropolymer Resin Discoloration |
WO2013169566A1 (en) * | 2012-05-09 | 2013-11-14 | E. I. Du Pont De Nemours And Company | Fluoropolymer dispersion treatment employing hypochlorite salts or nitrite salts to reduce fluoropolymer resin discoloration |
WO2013169581A1 (en) * | 2012-05-09 | 2013-11-14 | E. I. Du Pont De Nemours And Company | Fluoropolymer resin treatment employing oxidizing agent to reduce discoloration |
US20130345368A1 (en) * | 2012-05-09 | 2013-12-26 | E I Du Pont De Nemours And Company | Fluoropolymer Resin Treatment Employing Melt Extrusion and Exposure to Oxygen Source to Reduce Discoloration |
US8785560B2 (en) | 2012-05-09 | 2014-07-22 | E I Du Pont De Nemours And Company | Employing pretreatment and fluorination of fluoropolymer resin to reduce discoloration |
US8785516B2 (en) | 2012-05-09 | 2014-07-22 | E I Du Pont De Nemours And Company | Fluoropolymer dispersion treatment employing ultraviolet light and oxygen source to reduce fluoropolymer resin discoloration |
US9574027B2 (en) | 2013-03-11 | 2017-02-21 | The Chemours Company Fc, Llc | Fluoropolymer resin treatment employing sorbent to reduce fluoropolymer resin discoloration |
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US8703998B2 (en) | 2008-11-13 | 2014-04-22 | E I Du Pont De Nemours And Company | Fluorosulfonates |
US7989568B2 (en) | 2008-11-13 | 2011-08-02 | E.I. Du Pont De Nemours And Company | Fluorosulfonates |
US8461378B2 (en) | 2010-09-10 | 2013-06-11 | E.I. Du Pont De Nemours And Company | Purification of fluoroalkanesulfonate salts |
US8785560B2 (en) | 2012-05-09 | 2014-07-22 | E I Du Pont De Nemours And Company | Employing pretreatment and fluorination of fluoropolymer resin to reduce discoloration |
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US20130303710A1 (en) * | 2012-05-09 | 2013-11-14 | E I Du Pont De Nemours And Company | Fluoropolymer Dispersion Treatment Employing Hydrogen Peroxide to Reduce Fluoropolymer Resin Discoloration |
US20130303717A1 (en) * | 2012-05-09 | 2013-11-14 | E I Du Pont De Nemours And Company | Fluoropolymer Dispersion Treatment Employing Oxidizing Agent to Reduce Fluoropolymer Resin Discoloration |
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