WO2006064856A1 - フルオロポリマー水性分散液の製造方法 - Google Patents
フルオロポリマー水性分散液の製造方法 Download PDFInfo
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- WO2006064856A1 WO2006064856A1 PCT/JP2005/022979 JP2005022979W WO2006064856A1 WO 2006064856 A1 WO2006064856 A1 WO 2006064856A1 JP 2005022979 W JP2005022979 W JP 2005022979W WO 2006064856 A1 WO2006064856 A1 WO 2006064856A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
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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 various aqueous fluoropolymer dispersions excellent in stability, and to an aqueous fluoropolymer dispersion obtained by the production method.
- Aqueous dispersions of fluoropolymers have excellent film strength, chemical stability, non-adhesiveness, weather resistance, etc., because of the strength of this aqueous dispersion. It has been widely used in applications such as appliances, piping linings, and glass cloth impregnated membranes. In these applications, a fluoropolymer aqueous dispersion having a high solid content obtained by concentrating an aqueous dispersion of a fluoropolymer obtained by polymerizing a fluorine-containing monomer in an aqueous medium using a fluorine-containing emulsifier. used.
- the fluorinated emulsifier is generally expensive and is preferably recovered.
- Patent Document 1 requires special operations such as separation of the fluorinated emulsifier and reverse osmosis membrane treatment of the liquid containing the nonionic surfactant in order to reuse the nonionic surfactant. It was economically disadvantageous.
- Patent Document 2 describes a method in which a concentration operation using a large amount of nonionic surfactant in a fluoropolymer aqueous dispersion is performed a plurality of times in order to remove the fluorine-containing emulsifier in the aqueous dispersion.
- a concentration operation using a large amount of nonionic surfactant in a fluoropolymer aqueous dispersion is performed a plurality of times in order to remove the fluorine-containing emulsifier in the aqueous dispersion.
- a fluoropolymer is used as a fluorine-containing emulsifier aqueous solution.
- waste water was concentrated and treated by a reverse osmosis membrane caused by coagulation ⁇ after polymerization, a method of recovering has been proposed with 0 tooth force, the Roh - one surfactant Patent Document 1: Japanese Patent Application Laid-Open No. 55-120630
- Patent Document 2 Pamphlet of International Publication No. 2004Z050719
- Patent Document 3 Japanese Patent Laid-Open No. 2002-58966
- the object of the present invention is to newly adjust the concentration of a fluoropolymer or the like by using a phase that does not substantially contain the separated fluoropolymer and thereby newly adding an aqueous fluoropolymer dispersion. It is in providing the method of manufacturing. Means for solving the problem
- the present invention is a method for producing an aqueous fluoropolymer dispersion comprising adjusting the concentration.
- the method for producing an aqueous fluoropolymer dispersion includes the aqueous fluoropolymer dispersion A in the presence of a surfactant, Separating into phase Q and phase P containing fluoropolymer substantially free of fluoropolymer and separating phase Q, and using phase Q separated in step (1) above And a step (2) of producing the aqueous fluoropolymer dispersion by adjusting the concentration of the fluoropolymer in the aqueous fluoropolymer dispersion B.
- a method for producing an aqueous fluoropolymer dispersion comprising:
- the present invention is a method for producing an aqueous fluoropolymer dispersion comprising adjusting the concentration.
- the method for producing an aqueous fluoropolymer dispersion includes the aqueous fluoropolymer dispersion A in the presence of a surfactant, Separating into phase Q and phase P containing fluoropolymer substantially free of fluoropolymer and separating phase Q, and using phase Q separated in step (1) above And a step (2) of producing the fluoropolymer aqueous dispersion by adjusting the concentration of the fluorinated emulsion in the aqueous fluoropolymer dispersion B.
- a method for producing an aqueous fluoropolymer dispersion comprising:
- the present invention is described in detail below. [0009]
- the present invention is a method for producing an aqueous fluoropolymer dispersion comprising adjusting the concentration.
- the present invention is a method for producing a “fluoropolymer aqueous dispersion” by adjusting the concentration using “fluoropolymer aqueous dispersion A” and “fluoropolymer aqueous dispersion B” described later.
- fluoropolymer aqueous dispersion A and “fluoropolymer aqueous dispersion B” and “fluoropolymer aqueous dispersion B” which will be described later are simply referred to as “fluoropolymer aqueous dispersion” without adding “A” or “B”.
- fluoropolymer aqueous dispersion B an aqueous dispersion of a fluoropolymer obtained by adjusting the concentration using these “fluoropolymer aqueous dispersion A” and “fluoropolymer aqueous dispersion B”.
- the fluoropolymer constituting the fluoropolymer aqueous dispersion, the fluoropolymer constituting the fluoropolymer aqueous dispersion A, and the fluoropolymer constituting the fluoropolymer aqueous dispersion B may be different types. Usually, it is preferable to use the same type.
- fluoropolymer refers to the fluoropolymer constituting the fluoropolymer aqueous dispersion, the fluoropolymer constituting the fluoropolymer aqueous dispersion A, and the fluoropolymer aqueous component. This content is common to the fluoropolymers that make up dispersion B.
- the method for producing an aqueous fluoropolymer dispersion of the present invention comprises steps (1) and (2).
- the step (1) is carried out in the presence of a surfactant in an aqueous fluoropolymer dispersion.
- A is separated into a phase Q substantially containing no fluoropolymer and a phase P containing a fluoropolymer, and the phase Q is fractionated.
- the “fluoropolymer aqueous dispersion A” in the present invention is an aqueous dispersion containing a fluoropolymer and an aqueous medium as essential components.
- the fluoropolymer constituting the "aqueous fluoropolymer dispersion A" is a polymer having a fluorine atom bonded to a carbon atom.
- fluoropolymer examples include an elastomeric fluoropolymer and a resin. And fluoropolymers to be formed.
- the elastomeric fluoropolymer is an amorphous fluoropolymer having rubber elasticity, and usually has 30 to 80 mol% of monomer units of the first monomer.
- first monomer means a single monomer unit that occupies the largest molar ratio of all monomer units in the molecular structure of the elastomeric fluoropolymer. It means a mer.
- the first monomer include vinylidene fluoride [VDF] and tetrafluoroethylene [TFE].
- the “monomer unit” such as the monomer unit of the first monomer means a part of the molecular structure of the fluoropolymer and derived from the corresponding monomer.
- the TFE unit is a part of the molecular structure of the fluoropolymer, a part derived from TFE, and is represented by (CF 3 -CF 4).
- examples of the TFE polymer include TFE Z propylene copolymer and TFEZ perfluorobule ether copolymer.
- Hexafluoropropylene [HFP] HFPZ ethylene copolymer VDF polymer includes VDFZHFP copolymer, VDFZ black trifluoroethylene [C TFE] copolymer, VDFZTFE copolymer, VDFZ perfluoro Rheitel) [PAVE] copolymer, VDFZTFEZHFP copolymer, VDFZTFEZCTFE copolymer, VDFZTFEZPAVE copolymer and the like.
- the elastomeric fluoropolymer may be a segmented polymer. Examples of the segmented polymer include those described in JP-A-8-67795.
- Examples of the fluoropolymer constituting the resin include non-melting power fluoropolymers, melting power fluoropolymers, and the like.
- non-melting power fluoropolymer examples include PTFE.
- the PTFE is a concept including not only a TFE homopolymer but also a modified polytetrafluoroethylene [modified PTFE].
- modified PTFE means a copolymer of TFE and a trace monomer other than TFE, which is non-melt processable.
- trace monomer include fluoroolefins such as HFP and CTFE, fluoro having an alkyl group having 1 to 5 carbon atoms, particularly 1 to 3 carbon atoms (alkyl butyl etherol); Rosioxol; perfluoroalkylethylene; ⁇ -hydroperfluoroolefin.
- the content of the trace monomer units derived from the trace monomer in the total monomer units is usually in the range of 0.001 to 2 mol%.
- the content (mol%) of a trace monomer unit in all monomer units means the monomer from which the above “all monomer units” is derived, that is, a fluoropolymer. This means the mole fraction (mol%) of the trace monomer from which the trace monomer unit is derived, based on the total amount of the monomer that constitutes.
- melt strength fluoropolymer examples include HFP polymers such as ethylene ZTFE copolymer [ETF E], TFEZHFP copolymer [FEP], HFPZ ethylene copolymer, and TFEZ perfluoro (alkyl butyl).
- Ether) copolymer [TFEZPAVE copolymer], poly (vinylidene fluoride) [PVDF], PVD copolymer, poly (fluoride butyl)?
- TFEZPAVE copolymer examples include TFEZ perfluoro (methyl vinyl ether) [PMVE] copolymer [MFA], TFEZ perfluoro (ethyl vinyl ether) [PEVE] copolymer, TFEZ perfluoro (propyl butyl ether) [PPVE] copolymer.
- MFA methyl vinyl ether
- PEVE ethyl vinyl ether
- PPVE TFEZ perfluoro (propyl butyl ether) copolymer
- examples thereof include polymers, and among them, MFA and TFEZPPVE copolymers are preferred.
- TFEZPPVE copolymers are more preferred.
- VDF copolymer as the melt-additive fluoropolymer examples include VDFZTFE copolymer, VDFZHFP copolymer, VDFZCTFE copolymer, VDFZTFEZHFP copolymer, VDFZTFEZCTFE copolymer and the like.
- the average particle size of the fluoropolymer contained in the aqueous fluoropolymer dispersion A in the present invention is 50 to 500 nm, and preferably 100 to 350 nm.
- the aqueous medium constituting the above-mentioned "fluoropolymer aqueous dispersion A” is not particularly limited as long as it is a liquid containing water.
- the aqueous medium is fluorinated with alcohol, ether, ketone, fluorine such as alcohol Including non-containing organic solvent and Z or fluorine-containing organic solvent May be.
- the aqueous fluoropolymer dispersion A may further contain a surfactant.
- the surfactant that can be included in the aqueous fluoropolymer dispersion A is not particularly limited, and examples thereof include a non-ionic surfactant, a ionic surfactant, and the like, and also includes a fluorine-containing milky agent. But ...
- the surfactant that can be contained in the aqueous fluoropolymer dispersion A is the same surfactant that is present when separating into the supernatant phase and the concentrated phase in the step (1) described later.
- Conventionally known fluorine-containing emulsifiers can be used.
- perfluorooctanoic acid and its salt hereinafter, “perfluorooctanoic acid and its salt” are collectively abbreviated as “PFOA”.
- Perfluorooctylsulfonic acid and its salts hereinafter, “perfluorooctylsulfonic acid and its salts” are sometimes abbreviated as “PFOS”) and the like.
- Char-on surfactants can be used.
- the PFOA and PFOS are salts, they are not particularly limited, and examples thereof include ammonium salts.
- the fluorine-containing emulsifier may be added as an emulsifier when the fluoropolymer constituting the fluoropolymer aqueous dispersion A is polymerized in an aqueous medium.
- the aqueous fluoropolymer dispersion A in the present invention has a solid content concentration (hereinafter also referred to as "fluoropolymer concentration") of usually 5 to 60% by mass, preferably 10 to 40% by mass, more preferably 15 to 30% by mass.
- the surfactant concentration may be within a known range.
- the solid content concentration is measured by the method described in Examples below.
- the step (1) comprises separating the aqueous fluoropolymer dispersion A into the phase Q and the phase P in the presence of a surfactant and fractionating the phase Q.
- the phase P is a phase containing the fluoropolymer contained in the aqueous fluoropolymer dispersion A.
- the phase Q is a phase that is contained in the fluoropolymer aqueous dispersion A and does not substantially contain a fluoropolymer.
- the “phase substantially free of fluoropolymer” is separated from phase P containing the fluoropolymer, which is the residue of the fluoropolymer aqueous dispersion A after removing the phase P containing the fluoropolymer. It is sufficient if the phase can be recovered by a conventional method, and it does not exclude the presence or absence of a very small amount of fluoropolymer. In this sense, both “phase substantially free of fluoropolymer” , What you get.
- substantially free of fluoropolymer means that the fluoropolymer is not contained to the extent that it is used for various purposes, as described later, and does not necessarily mean that it is not contained at all.
- the phase Q can contain a fluoropolymer only within a range without affecting the properties even when mixed in the aqueous fluoropolymer dispersion obtained by the production method of the present invention.
- the fluoropolymer content is preferably 1% by mass or less, more preferably 0.5% by mass or less, and 0.1% by mass or less. Is more preferable.
- phase Q and phase P means to separate into phase Q and phase P.
- the expression “separate” used for the same purpose is also the same. For example, in the case of “separation into phase Q1 and phase P1” described later, it is similarly divided into phase Q1 and phase P1. It means that
- phase Q means that phase P is left behind and phase Q is taken out.
- the expression “separate” used for the same purpose is the same.
- phase P1 is left behind and phase Q1 is taken out. Means.
- separating into phase Q and phase P and “separating phase Q” are operations performed sequentially in this order in a batch system (batch system). Or, it may be an operation of continuously performing “separation into phase Q and phase P” and “separation of phase Q”.
- the fluoropolymer aqueous dispersion A Phase Q (herein referred to as “supernatant phase” t), which is substantially free of fluoropolymer, and phase P (here, “concentrated phase”), which contains fluoropolymer.
- the surfactant that is present during the separation may be used for the purpose of stabilizing the aqueous fluoropolymer dispersion A or phase P.
- Examples of the surfactant that is present when the aqueous fluoropolymer dispersion A is separated into the supernatant phase and the concentrated phase include known non-ionic surfactants and key-on surfactants. An on-surfactant is preferred.
- the surfactant used for separating the aqueous fluoropolymer dispersion A into a supernatant phase and a concentrated phase may be a surfactant contained in the aqueous fluoropolymer dispersion A.
- the surfactant may be newly added in the step (1), or both the surfactant contained in the aqueous fluoropolymer dispersion A and the surfactant newly added in the step (1) may be used. It is preferable to newly add the surfactant used when separating into the supernatant phase and the concentrated phase.
- a known nonionic surfactant can be used as the nonionic surfactant used when separating the aqueous fluoropolymer dispersion A into a supernatant phase and a concentrated phase.
- a polyoxyethylene alkylphenol can be used.
- Ether type nonionic surfactants such as phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, polyoxyethylene derivatives such as ethylene oxide Z propylene oxide block copolymer, sorbitan fatty acid ester, polyoxyethylene Ester-type surfactants such as sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene alkylamine, alkyl alcohol alcohol Include amine Noyuon emulsifier like.
- a zo-one surfactant having no alkylphenol in the structure is preferably used.
- the ionic surfactant used when separating the aqueous fluoropolymer dispersion A into a supernatant phase and a concentrated phase is not particularly limited.
- a known fluorine-containing ionic surfactant is used.
- a surfactant or the like can be used.
- Perfluorinated carboxylic acid compounds and z or perfluorinated sulfonic acid compounds which are preferably fluorinated carboxylic acid compounds and / or fluorinated sulfonic acid compounds.
- a perfluorocarboxylic acid compound having 6 to 12 carbon atoms More preferred is a perfluorocarboxylic acid compound having 6 to 12 carbon atoms, and Z or a perfluorosulfonic acid compound having 6 to 12 carbon atoms.
- a perfluorocarboxylic acid compound having a preferable carbon number of 6 to 12 is particularly preferable.
- fluorine-containing surfactant examples include PFOA.
- Step (1) is preferably carried out in the presence of 500 to 20000 parts by mass of a non-ionic surfactant per 100 parts by mass of the fluorinated emulsifier in the aqueous fluoropolymer dispersion A.
- the more preferable lower limit of the nonionic surfactant per 100 parts by mass of the fluorinated emulsifier is 6000 parts by mass
- the still more preferable lower limit is 8000 parts by mass
- the more preferable upper limit is 17000 parts by mass.
- the fluoropolymer is TFE homopolymer and Z or modified PTF E, it is preferably carried out in the presence of 8000 parts by mass or more of a nonionic surfactant per 100 parts by mass of the fluorine-containing emulsifier.
- the separation and fractionation operation in step (1) may be performed once or may be performed twice or more.
- the operation of separating the fluoropolymer aqueous dispersion A into the phase Q and the phase P and separating the phase Q is performed once.
- the nonionic surfactant is added to the fluoropolymer monoaqueous. It is preferable that 500 to 20000 parts by mass per 100 parts by mass of the fluorine-containing emulsifier in the dispersion A.
- step (1) when the phase separation concentration, the electric concentration and the Z or ion exchange concentration are performed in the presence of a nonionic surfactant within the above range, an aqueous fluoropolymer dispersion having a low content of a fluorinated emulsifier is obtained. Because it is easy to obtain, it is preferable.
- the range of the amount of the nonionic surfactant present per 100 parts by mass of the above-mentioned fluorinated emulsifier is particularly suitable when the phase separation / concentration is performed once as an operation of separation / separation in the step (1).
- Examples of the method for separating and separating into phase Q and phase P in the above step (1) include conventionally known methods such as electric concentration, ultrafiltration membrane method, phase separation concentration, ion exchange concentration and the like.
- Examples of the electric concentration include an electric decantation method described in JP-T-10-510472.
- ultrafiltration membrane method examples include the method described in JP-A-55-120630.
- phase separation concentration examples include a heat concentration method.
- the heat concentration method for example, a method of performing heat concentration a plurality of times described in International Publication No. 2004Z050719 pamphlet can be used.
- the separation and separation operation of the phase Q and the phase P is preferably performed by separating and separating while maintaining the boundary surface without disturbing the boundary surface between the phase Q and the phase P.
- thermal concentration method is a concentration method usually performed by heating to a temperature higher than the cloud point of the nonionic surfactant, and is sometimes referred to as “cloud point concentration”.
- Step (2) in the present invention is a step comprising producing an aqueous fluoropolymer dispersion by adjusting the concentration in the aqueous fluoropolymer dispersion B using the phase Q fractionated in step (1). .
- the present invention pays attention to the fact that a phase substantially free of a fluoropolymer produced by a subsequent process such as concentration of a fluoropolymer polymerization reaction solution contains a surfactant, and using the phase, It was completed by finding that it was possible to adjust the concentration of the aqueous dispersion very efficiently, and that the resulting fluoropolymer aqueous dispersion showed excellent stability.
- step (2) in the present invention, the above-mentioned “phase Q fractionated in the step (1)” is used.
- phase Q fractionated in the above step (1) contains the surfactant present in the step (1).
- phase Q means (i) phase Q may be used as it is, or (ii) post-treatment such as concentration, ion exchanger treatment, membrane treatment, etc.
- concentration concentration, ion exchanger treatment, membrane treatment, etc.
- the above-mentioned field obtained by the latter (ii) post-treatment What contains a surface active agent is a liquid composition normally, and it is preferable that it is an aqueous liquid composition.
- surfactant composition (i) phase Q itself and (ii) those obtained by post-treatment and containing the above surfactant are collectively referred to as "surfactant composition”. ”T ⁇ ⁇ sometimes.
- the surfactant contained in the “surfactant composition” is preferably a non-one surfactant.
- nonionic surfactant composition containing a nonionic surfactant as a surfactant is sometimes referred to as “nonionic surfactant composition”.
- the non-one surfactant composition in the present invention contains a non-one surfactant and water as essential components.
- the non-ionic surfactant composition may further be a mixture of the fluoropolymer contained in the aqueous fluoropolymer dispersion A, or the fluorine-containing emulsifier contained in the aqueous fluoropolymer dispersion A. , Electrolytes, water-soluble organic solvents, etc.
- the amount of the nonionic surfactant contained in the supernatant Q) is usually 1 to 30% by mass, and the HLB is 10 to 15%.
- the nonionic surfactant composition used for adjusting the concentration of the fluoropolymer aqueous dispersion B may be the supernatant as it is.
- the fluoropolymer content, nonionic surfactant content, HLB, fluorine-containing emulsifier content, electrical conductivity, etc. are appropriately controlled by performing operations such as concentration, ion exchanger treatment and membrane treatment. There may be.
- the fluoropolymer content is preferably 5% by mass or less, more preferably 1% by mass or less, and 0.5% by mass. More preferably, it is as follows.
- the preferred nonionic surfactant content in the above-mentioned nonionic surfactant composition is 10 to 10% of the above-mentioned nonionic surfactant composition when used for adjusting the fluoropolymer concentration of the fluoropolymer aqueous dispersion B. 99.8% by mass, 10 to 50% by mass of the above-mentioned surfactant composition when used for adjusting the concentration of the fluorine-containing emulsifier.
- the content of the above-mentioned nonionic surfactant is determined by the evaporation method, the thermal phase separation method using the cloud point of the nonionic surfactant, the membrane concentration method, and a freshly prepared (virgin) nonionic surfactant. It is adjusted by the method of adding.
- the water content in the composition of the surfactant is increased, and a fluoropolymer aqueous solution is added to contain an effective amount for adjusting the concentration of the fluoropolymer and Z or the fluorinated emulsifier. Since the amount of the nonionic surfactant composition that can be retained in Dispersion B increases, a large amount of water is added together, and it takes time to concentrate. In order to increase the concentration, a large amount of water in the nonionic surfactant composition may be removed in advance. However, the amount of the surfactant to be present in step (1) is eliminated in order to eliminate the economic disadvantage. In the step (1), it can be relatively increased as described above.
- the non-one surfactant composition is used in addition to adjusting the concentration of the non-one surfactant, and adjusting the HLB, fluorine-containing emulsifier content, electrical conductivity, etc. Also good.
- the HLB range of the nonionic surfactant composition is preferably 12 to 14 when used for adjusting the concentration of the fluorinated emulsifier. This can be adjusted, for example, by adding a virgin non-ionic surfactant to Phase Q above.
- the content of the fluorine-containing emulsifier is preferably 10 ppm or less, more preferably 100 ppm, and when it is used for adjusting the concentration of the fluorine-containing emulsifier, it is particularly preferably adjusted to 10 ppm or less.
- the content of the fluorinated emulsifier is adjusted by an ion exchanger contact method, a method of forming a complex of the fluorinated emulsifier and separating it as a precipitate, an electrophoresis method, or the like.
- the electrical conductivity in the non-ionic surfactant composition is preferably 2000 mSZcm or less, more preferably 10 mOZSZcm or less, and still more preferably 10 mSZcm or less.
- the electric conductivity can be adjusted by a method such as an ion exchanger contact method, a chelating agent treatment method, or dilution with ion exchange water.
- the aqueous fluoropolymer dispersion B is an aqueous dispersion composed of a fluoropolymer and an aqueous medium.
- the fluoropolymer and the aqueous medium in the aqueous fluoropolymer dispersion B are the same as described above.
- the aqueous fluoropolymer dispersion B may further contain a surfactant as described above.
- a surfactant as described above.
- those described above as the surfactant that is present when separating into the supernatant phase and the concentrated phase in step (1) can be used. Etc.
- the fluoropolymer aqueous dispersion B is not particularly limited, and may be, for example, an aqueous dispersion prepared separately from the above-described fluoropolymer aqueous dispersion A.
- the type of fluoropolymer is fluoropolymer. Although it may be different from the aqueous dispersion A, it is preferably the same type for use.
- the aqueous fluoropolymer dispersion B in the present invention may also be the aqueous fluoropolymer dispersion A used in step (1)! /, And the supernatant phase (phase Q) from the aqueous fluoropolymer dispersion A. ) May be the remainder of the fractionation, ie the concentrated phase (phase P)! / ⁇ .
- the concentration is adjusted efficiently. be able to.
- the aqueous fluoropolymer dispersion B in the present invention preferably has a solid concentration of 5 to 75% by mass, more preferably 30 to 72% by mass.
- the aqueous fluoropolymer dispersion B has a surfactant concentration of preferably 1 to 10% by mass, more preferably 2 to 7% by mass.
- the concentration adjustment in the present invention may be performed by adjusting the strength of the fluoropolymer aqueous dispersion B in the fluoropolymer aqueous dispersion B used in the step (2) or by adjusting the concentration of the fluoropolymer in the aqueous fluoropolymer dispersion B.
- the concentration of the surfactant in B may be adjusted, for example, the concentration of the fluorinated emulsifier, or the concentration of the fluorinated emulsifier in the aqueous fluoropolymer dispersion B and further the concentration of the fluoropolymer may be adjusted. Good.
- Step (2) Force
- a surfactant is used.
- the surfactant preferably contains at least a surfactant and water, and the surfactant is preferably a nonionic surfactant.
- Step (2) Force When the fluoropolymer aqueous dispersion is produced by adjusting the concentration of the fluorinated emulsifier in the aqueous fluoropolymer dispersion B using the phase Q fractionated in the step (1), usually, In this case, it is preferable to adjust the concentration so as to reduce the concentration of the fluorine-containing emulsifier. The thing containing is preferable.
- Step (2) Force A fluoropolymer aqueous dispersion is obtained by adjusting the concentration of the fluorinated emulsifier in the aqueous fluoropolymer dispersion B and further the concentration of the fluoropolymer using the phase Q separated in step (1). In this case, it is usually preferable to adjust the concentration so as to reduce the concentration of the fluorine-containing emulsifier.
- the surfactant composition further includes an interface other than the fluorine-containing emulsifier such as a non-ionic surfactant. Those containing an activator and water are preferred.
- the fluorine-containing emulsifier concentration and the Z or fluoropolymer concentration may be adjusted using the nonionic surfactant composition obtained as the phase Q as it is, and obtained as the phase Q. It is also possible to use a non-ionic surfactant composition with an appropriately adjusted non-ionic surfactant concentration, or to use a virgin non-ionic surfactant and these surfactants. You can use it in combination with the agent composition!
- step (2) adjusting the fluoropolymer concentration usually involves a mixing step of adding phase Q to the fluoropolymer aqueous dispersion B.
- the phase Q may be added so that the amount of the surfactant in the mixture of the aqueous fluoropolymer dispersion B and the phase Q is the same as the surfactant present in the step (1). preferable.
- step (2) adjusting the concentration of the fluorine-containing emulsifier includes adding the phase Q to the fluoropolymer aqueous dispersion B as described above,
- the phase separation step is preferably performed by a thermal concentration method.
- the above heat concentration method when the above heat concentration method is performed, it is preferably performed under the conditions described in International Publication No. 2004Z050719 pamphlet.
- step (2) the mixing step in the above-mentioned fluoropolymer concentration adjustment and the mixing step in the fluorine-containing emulsifier concentration adjustment are as described above by adding "Phase Q to the fluoropolymer aqueous dispersion B".
- “adding phase Q” means that (i) phase Q can be used as it is, and (ii) phase Q is added to phase Q as in the case of “using phase Q” described above.
- What is obtained by performing post-treatment such as separation, ion exchanger treatment, membrane treatment, etc., which contains a surfactant present in the separation into phase Q and phase P in step (1) It means you can bargain. Although it may not be an indirect force, there is virtually no difference in “adding phase Q” even if it is “obtained by post-processing phase Q” in (ii) above.
- the mixing step in the above-mentioned fluoropolymer concentration adjustment and the mixing step in the fluorine-containing emulsifier concentration adjustment may be performed by concentrating and adding the phase Q.
- the method for example, the method of separating into phase Q and phase P in step (1) and the various methods described for the preparation of the above-mentioned nonionic surfactant composition can be performed.
- the fluoropolymer concentration of the fluoropolymer aqueous dispersion B is adjusted by a known method such as electrophoresis, evaporation concentration, phase separation concentration, ultrafiltration membrane concentration, or centrifugation.
- phase concentration concentration is preferable, and thermal concentration (cloud point concentration) is more preferable.
- the concentration of the fluorinated emulsifier in the aqueous fluoropolymer dispersion B can be adjusted by, for example, a method of performing thermal concentration once or a plurality of times, a method of contacting with an ion exchanger, an ultrafiltration It can be performed by a known method such as membrane concentration.
- the fluoropolymer aqueous dispersion obtained in the present invention can have a fluoropolymer concentration of usually 30 to 75% by mass, preferably 40 to 70% by mass.
- the fluoropolymer aqueous dispersion may have a fluorine-containing emulsifier concentration of usually 1800 ppm or less, more preferably 1600 ppm or less, and still more preferably Can be 1500 ppm or less.
- a fluorine-containing emulsifier concentration usually 1800 ppm or less, more preferably 1600 ppm or less, and still more preferably Can be 1500 ppm or less.
- the concentration of the fluorine-containing emulsifier can be 800 ppm or less
- the fluorine-containing polymer is a TFEZVDFZHFP copolymer
- the concentration Can be reduced to 300 ppm or less.
- the fluoropolymer aqueous dispersion has a fluoropolymer concentration within the above range, it can be easily prepared, for example, as a coating composition, a molded article or the like. Further, since the fluoropolymer aqueous dispersion has a low concentration of the fluorinated emulsifier, it can exhibit the characteristics of the fluoropolymer without being affected by the fluorinated emulsifier when used in various applications.
- aqueous fluoropolymer dispersion is not affected by the fluorine-containing emulsifier, it is excellent in stability, for example, the viscosity change with temperature change is slight.
- the method for producing an aqueous fluoropolymer dispersion of the present invention has the above-described configuration, the fluoropolymer containing a surfactant produced by a subsequent process such as concentration of the fluoropolymer polymerization reaction liquid is substantially reduced.
- concentration of the aqueous fluoropolymer dispersion can be adjusted very efficiently by using the phase not containing, and furthermore, an aqueous fluoropolymer dispersion exhibiting extremely excellent stability can be obtained.
- N (Y-Z) / XX 100 (%)
- Fluorine-containing emulsifier content perfluorooctanoic acid ammonium [PFOA] concentration
- PFOA perfluorooctanoic acid ammonium
- the non-ionic surfactant composition A was concentrated at 80 ° C. for 6 hours, cooled, and filtered through a 0.5 / zm membrane filter to obtain 28.5 g of a non-ionic surfactant composition B.
- Non-on interface The activator concentration was 60% and the PFOA concentration was 98 ppm.
- Anion exchange resin (Rohm & Haas, Amberlite IRA402BL) was packed in a Pyrex glass column (inner diameter 16 mm ⁇ X height 600 mm) so that the packed bed height was 200 mm.
- IN-NaOH was passed through 200 ml to form OH, and then ion-exchanged water 500 ml was passed through.
- 200 g of the NOON surfactant composition A was passed, and after 198 g was collected, it was concentrated at 80 ° C for 6 hours, cooled and filtered through a 0.5 m membrane filter.
- Surfactant composition C was obtained.
- the concentration of the non-ionic surfactant was 60% and the PFO A concentration was 3 ppm.
- Nonionic surfactant composition B27g and ion-exchanged water 144g were added and mixed uniformly. When this was allowed to stand in a 65 ° C hot water bath, the time until the volume of the concentrated phase reached 50% of the whole was 60 minutes.
- the mixture was centrifuged at 5000 rpm (1677G) for 30 minutes, and the PFOA concentration and the fluoropolymer concentration contained in the supernatant phase were measured and found to be 190 ppm and 0.1%, respectively.
- the aqueous dispersion was centrifuged at 5000 rpm (1677G) for 30 minutes, and the PFOA concentration and the fluoropolymer concentration contained in the supernatant phase were measured and found to be 201 ppm and 1.3%, respectively.
- the concentrated phase was returned to the container, 350 g of ion exchange water and 27.5 g of Neugen TD S-80 were added, mixed until uniform, and then concentrated again at 65 ° C. This operation was repeated and concentrated three times in total.
- the supernatant (nonionic surfactant composition D) recovered after 3 times of concentration was 376.5 g, the concentration of non-ionic surfactant was 7.3%, the concentration of PFOA was 60 ppm, and the concentration of fluoropolymer was 0.1. %Met.
- the method for producing an aqueous fluoropolymer dispersion of the present invention uses a phase and a fluoropolymer aqueous solution substantially free of a fluoropolymer containing a surfactant produced by a subsequent step such as concentration of the fluoropolymer polymerization reaction solution.
- concentration of the dispersion can be adjusted very efficiently, and furthermore, an aqueous fluoropolymer dispersion exhibiting extremely excellent stability can be obtained, making it possible to produce the fluoropolymer at a low cost.
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US20030168405A1 (en) * | 2000-08-11 | 2003-09-11 | Takuya Ichida | Method of recovering fluorochemical surfactant |
WO2004050719A1 (ja) * | 2002-11-29 | 2004-06-17 | Daikin Industries, Ltd. | 含フッ素ポリマー水性エマルション精製方法、精製エマルション及び含フッ素加工品 |
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US20030168405A1 (en) * | 2000-08-11 | 2003-09-11 | Takuya Ichida | Method of recovering fluorochemical surfactant |
WO2004050719A1 (ja) * | 2002-11-29 | 2004-06-17 | Daikin Industries, Ltd. | 含フッ素ポリマー水性エマルション精製方法、精製エマルション及び含フッ素加工品 |
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