WO2015002000A1 - ポリテトラフルオロエチレン多孔質複合体及びその製造方法 - Google Patents
ポリテトラフルオロエチレン多孔質複合体及びその製造方法 Download PDFInfo
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- WO2015002000A1 WO2015002000A1 PCT/JP2014/066554 JP2014066554W WO2015002000A1 WO 2015002000 A1 WO2015002000 A1 WO 2015002000A1 JP 2014066554 W JP2014066554 W JP 2014066554W WO 2015002000 A1 WO2015002000 A1 WO 2015002000A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/1213—Laminated layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/04—4 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/02—Cellular or porous
- B32B2305/026—Porous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/702—Amorphous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/02—Temperature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249981—Plural void-containing components
Definitions
- the present invention relates to a polytetrafluoroethylene (PTFE) porous composite and a method for producing the same.
- the PTFE porous composite is a composite comprising a porous membrane (PTFE porous membrane) made of a fluororesin mainly composed of PTFE, a support layer thereof, and a reinforcing layer thereof.
- PTFE is a resin having excellent heat resistance and chemical resistance.
- a PTFE porous film having a uniform and fine pore diameter can be obtained by stretching a film obtained by molding and sintering the fluororesin particles mainly composed of PTFE into a film shape.
- This PTFE porous membrane is made of PTFE material, so it has excellent heat resistance and chemical resistance, has a uniform and fine pore diameter, and easily obtains high porosity, so it is a filter for removing fine impurity particles from the liquid. It is used as A combination (hereinafter referred to as “bonded body”) of this PTFE porous membrane and a porous body that is a support layer and a manufacturing method thereof are described in, for example, Patent Document 1.
- this bonded body is suitably used as a filter for removing foreign substances from an etching solution, a cleaning solution, or the like.
- Patent Document 1 when a PTFE porous membrane and a support layer bonded body described in Patent Document 1 are used as a filter, in order to obtain a large filtration area, the filter is formed into a pleated shape formed with folds. It is often installed in. However, there is a problem that leakage due to breakage of the PTFE porous membrane and enlargement of the pore diameter of the PTFE porous membrane are likely to occur at the folded portion of the folds. Therefore, Patent Document 1 describes that it has excellent mechanical strength while maintaining a fine pore diameter and a high treatment flow rate, and can also maintain the heat resistance and chemical resistance inherent in the PTFE membrane. Development of a technique for reinforcing a bonded body of a porous PTFE membrane and its support layer is desired.
- the reinforcement of the bonded body of the PTFE porous membrane and its supporting layer is performed by a porous reinforcing layer.
- complex which bonded this reinforcement layer to the PTFE porous membrane of the bonded body of PTFE porous membrane and its support layer, and provided the mechanical strength is widely used as a filter.
- the reinforcing layer is a relatively thick membrane because it has excellent mechanical strength, while it is a porous membrane having a larger pore diameter than the PTFE porous membrane so as not to reduce the filtration flow rate.
- Adhesion between the reinforcing layer and the PTFE porous membrane can be achieved by a method in which the reinforcing layer and the PTFE porous membrane are simply bonded and then heated to a melting point of PTFE or higher, and a tetrafluoroethylene / perfluoroalkyl / vinyl ether copolymer ( PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP) or the like is used as an adhesive, and a method of adhering the reinforcing layer is performed.
- PFA tetrafluoroethylene / perfluoroalkyl / vinyl ether copolymer
- FEP tetrafluoroethylene / hexafluoropropylene copolymer
- a dispersion layer such as PFA or FEP is provided between the reinforcing layer and the PTFE porous film, and the bonding is performed by heating to melt PFA or FEP. Accordingly, in this case as well, it is necessary to heat to a melting point or higher such as PFA or FEP for adhesion.
- a PTFE porous composite as a filter used in semiconductor manufacturing or the like may require an average flow pore size of about 30 nm or less.
- heating at a high temperature is required, and the hole diameter is enlarged by heating. Therefore, a fine porous structure cannot be maintained, and a pore diameter of less than 40 nm has not been obtained.
- the present invention relates to a PTFE porous composite having a fine pore size, maintaining a high processing flow rate and excellent mechanical strength, and maintaining the excellent heat resistance and chemical resistance inherent in the PTFE membrane, and a method for producing the same It is an issue to provide. In particular, it has a pore diameter of less than 40 nm to meet recent demands, and a large treatment flow rate can be obtained, and even when it is pleated, damage to the PTFE porous membrane at the folded portion of the folds and expansion of the pore diameter occurs.
- An object of the present invention is to provide a porous PTFE composite and a method for producing the same.
- One aspect of the present invention includes a PTFE porous membrane, a porous support layer that supports the PTFE porous membrane, an adhesive layer that adheres to the PTFE porous membrane, and the adhesive layer A PTFE porous composite which has a porous reinforcing layer bonded thereto, and the adhesive layer is a fluororesin layer having a glass transition point of less than 260 ° C. when the melting point or no melting point exists.
- the nonporous fluororesin film is obtained by stretching a bonded body of a nonporous fluororesin film mainly composed of PTFE and a porous layer as a support layer thereof.
- a PTFE porous membrane a step of forming an adhesive layer on the surface of the PTFE porous membrane, and a step of adhering a porous reinforcing layer to the adhesive layer, the adhesive layer comprising:
- the glass transition point is a fluororesin layer having a temperature of less than 260 ° C.
- the step of bonding the reinforcing layer is performed at a temperature not lower than the melting point or the glass transition point and lower than 260 ° C.
- the PTFE porous composite of the present invention maintains the excellent heat resistance and chemical resistance inherent in the PTFE membrane and has excellent mechanical strength.
- the PTFE porous composite does not cause damage to the PTFE porous membrane or enlargement of the pore diameter even in the folded portion of the folds in the case of a pleat shape.
- a large treatment flow rate is maintained with a fine pore diameter, and the PTFE porous membrane is damaged or the pore diameter is reduced at the folded portion of the fold when the pleat is formed.
- a PTFE porous composite having excellent mechanical strength and characteristics that does not cause expansion can be obtained.
- the inventor found the following and completed the present invention.
- an adhesive made of a fluororesin having a glass transition point of less than 260 ° C. is used, and the adhesion between the PTFE porous membrane and the porous body serving as the reinforcing layer is performed by the melting point or the glass transition point. It is performed at the above temperature and less than 260 ° C.
- a high processing flow rate is maintained with a fine pore diameter, and PTFE porous material having excellent mechanical strength that does not cause damage to the PTFE porous membrane or enlargement of the pore diameter even at the folded portion of the pleat when it is made pleated.
- a complex is obtained. That is, the said subject is solved by the structure shown below.
- a first aspect of the present invention includes a PTFE porous membrane, a porous support layer that supports the PTFE porous membrane, an adhesive layer that adheres to the PTFE porous membrane, and an adhesive layer that adheres to the adhesive layer.
- the adhesive layer has a melting point or no melting point
- the PTFE porous composite is a fluororesin layer having a glass transition point of less than 260 ° C.
- the bonded body of the PTFE porous membrane and its support layer is produced, for example, by the method described in Patent Document 1 (Japanese Patent No. 4371176). That is, a porous layer serving as a support layer is bonded to a non-porous PTFE film formed by forming fluororesin particles mainly composed of PTFE into a film shape and then sintering between the particles. The nonporous PTFE membrane and the support layer bonded body are stretched to obtain a porous porous PTFE membrane.
- the PTFE porous composite of the present invention is formed by adhering a reinforcing layer to the bonded body of the PTFE porous membrane thus produced and its support layer with the adhesive layer.
- mainly PTFE means that PTFE is contained in an amount of 50% by mass or more, but other resins may be contained within a range not impairing the gist of the present invention. Among these, those containing 80% by mass or more of PTFE are preferable because the excellent properties of PTFE such as chemical resistance and heat resistance become more remarkable.
- the present invention is characterized in that the adhesive layer for laminating the PTFE porous membrane and the reinforcing layer is composed of a fluororesin having a glass transition point of less than 260 ° C. when there is no melting point or no melting point.
- the step of bonding the PTFE porous membrane and the reinforcing layer with the adhesive layer can be performed at less than 260 ° C. by using a fluororesin having a glass transition point of less than 260 ° C.
- the expansion of the pore diameter of the PTFE porous membrane due to heating in the bonding step can be prevented.
- a PTFE porous composite having excellent mechanical strength and characteristics that does not cause breakage of the PTFE porous membrane or enlargement of the pore diameter can be obtained even in the folded portion of the folded pleat when the pleat is used.
- a fluororesin constituting the adhesive layer a fluororesin having a glass transition point of less than 200 ° C. is more preferable when the melting point or the melting point does not exist.
- the fluororesin having a glass transition point of less than 260 ° C. is a solvent-soluble, heat-resistant, chemical-resistant fluorine-based ion exchange resin or amorphous fluororesin.
- a fluorine-based ion exchange resin paints and fluorine resin particles that are commercially available under trade names such as Nafion (registered trademark, manufactured by DuPont) and AQUIVION (registered trademark, manufactured by Solvay Special Polymers Japan) are dispersed. A dispersion can be used.
- An amorphous fluororesin is an amorphous fluororesin and is a resin that can be dissolved in a solvent.
- Amorphous fluororesins are commercially available under trade names such as CYTOP (Asahi Glass Co., Ltd.), Teflon (registered trademark) AF (Mitsui / DuPont Fluoro Chemical Co.), Algoflon AD (Solvay Special Polymers Japan Co., Ltd.), etc. Can be used.
- the average flow pore size of the PTFE porous membrane is preferably less than 40 nm.
- a PTFE porous membrane having such a fine pore size it becomes a filter having characteristics that meet recent demands in the field of semiconductor manufacturing and the like.
- the average flow pore size of less than 40 nm can be obtained by adjusting the stretching ratio, etc., it has been difficult to obtain an average flow pore size of less than 40 nm by heating in the process of bonding the reinforcing layer. there were.
- a porous body made of PTFE is preferably used for the reinforcing layer of the porous body constituting the composite.
- a porous film formed by stretching a film mainly composed of PTFE produced by the method described in Japanese Patent Publication No. 42-13560 can be given.
- a commercially available product such as Poreflon HP-045-30 (expanded PTFE porous material manufactured by Sumitomo Electric Fine Polymer Co., Ltd.) can be used.
- the reinforcing layer of the porous body is a relatively thick film.
- it is larger than the PTFE porous film.
- It is a porous membrane having a pore size.
- a porous body made of a fluororesin mainly composed of PTFE having a thickness of about 5 to 200 ⁇ m and an average flow pore size of about 0.1 to 5 ⁇ m is preferably used.
- a nonporous fluororesin film mainly composed of PTFE and a porous layer as a supporting layer thereof are stretched to form the nonporous fluororesin film as a PTFE porous material.
- the PTFE porous layer is a fluororesin layer having a glass transition point of less than 260 ° C.
- the step of adhering the reinforcing layer is performed at a temperature above the melting point or glass transition point and at a temperature of less than 260 ° C. It is a manufacturing method of a quality complex.
- the nonporous fluororesin film mainly composed of PTFE is preferably a nonporous film mainly composed of PTFE and free from defects such as large pores (a film having a large Gurley second).
- a PTFE porous membrane can be obtained by stretching this membrane, but the extent of stretching is preferably performed in a range where the average flow pore size is less than 40 nm.
- the support layer is a porous body having a larger pore diameter than that of the fluororesin porous membrane, and is preferably excellent in mechanical strength and the like. Therefore, a fluororesin porous body is preferably used.
- the nonporous fluororesin film is bonded to this support layer, but the porous support layer is also stretched by stretching.
- the PTFE porous membrane formed by stretching (a fluororesin porous membrane mainly composed of PTFE) and the support layer thereof are bonded to the PTFE porous membrane side (that is, the surface opposite to the support layer).
- An adhesive layer is formed, and the porous reinforcing layer is bonded to the adhesive layer.
- the PTFE porous membrane and the porous reinforcing layer are bonded by heating, and this heating is performed at a temperature not lower than 260 ° C. above the melting point or glass transition point of the fluororesin constituting the adhesive.
- the heating temperature is lower than the melting point of the fluororesin constituting the adhesive, or if the fluororesin does not have a melting point, the temperature is lower than the glass transition point, sufficient adhesion cannot be obtained.
- the temperature is 260 ° C. or higher, the pore diameter is enlarged, and it is difficult to obtain a pore diameter of less than 40 nm.
- the fluororesin constituting the adhesive layer when the melting point or the melting point does not exist, a fluororesin having a glass transition point of less than 200 ° C. is used, and heating in the bonding step is performed. More preferably, the melting point or the glass transition point is not higher than 200 ° C., and the expansion of the pore diameter of the PTFE porous membrane in the bonding step can be more effectively prevented.
- GALWICK propylene, 1,1,2,3,3,3 hexahydrofluoric acid (manufactured by Porous Materials, Inc.) was used as a liquid using a pore distribution measuring device (palm porometer CFP-1500A: manufactured by Porous Materials, Inc.). Specifically, it is obtained as follows: First, the relationship between the differential pressure applied to the membrane and the flow rate of air passing through the membrane is shown as follows: when the membrane is dry and when the membrane is liquid.
- PTFE dispersion AD911 manufactured by Asahi Glass Co., Ltd.
- MFA latex manufactured by Solvay Special Polymers Japan Co., Ltd.
- PFA dispersion 920HP solid content 60 mass%; manufactured by Mitsui Dupont Fluorochemical Co., Ltd.
- MFA / (PTFE + MFA + PFA) (volume ratio of fluororesin solids) and PFA / (PTFE + MFA + PFA) (volume ratio of fluororesin solids) of 2% each were prepared, and further polyethylene oxide having a molecular weight of 2 million was added to a concentration of 3 mg / ml to adjust the fluororesin dispersion.
- the foil was dried at 80 ° C. for 1 hour, heated at 250 ° C. for 1 hour, and heated at 340 ° C. for 1 hour, followed by natural cooling and a fluororesin film (PTFE) fixed on the aluminum foil.
- PTFE fluororesin film
- a non-porous fluororesin film (mainly) was formed.
- the average thickness of the fluororesin film calculated from the weight difference per unit area of the aluminum foil before and after the fluororesin film was formed and the true specific gravity of the fluororesin (2.25 g / cm 3 ) was about 3 ⁇ m.
- PFA dispersion 920HP was diluted with distilled water to a volume of 4 times, and polyethylene oxide with a molecular weight of 2 million was added to a concentration of 3 mg / ml, and a 4-fold diluted PFA dispersion was added. It was adjusted.
- an expanded PTFE porous material having a pore diameter of 0.45 ⁇ m and a thickness of 80 ⁇ m manufactured by Sumitomo Electric Fine Polymer Co., Ltd .; trade name: BoaFLON FP-045-80
- IPA-BP 150 kPa, pores
- moisture does not dry (Rate: 70%, Gurley seconds: 9.1 seconds).
- this test body was stretched in the width direction using a tensile tester at a temperature of 15 ° C., a chuck interval of 55 mm, and a stroke of 165 mm (stretching rate: 200%). Thereafter, the film was further stretched in a direction perpendicular to the width direction at a temperature of 60 ° C., a distance between chucks of 55 mm, and a stroke of 88 mm (stretching ratio: 60%) using the same tensile tester.
- This stretched test body (bonded body of support layer and PTFE porous membrane) is designated as NM1.
- the average flow pore size of NM1 was 32.7 nm, and it was shown that the fluororesin film made porous by stretching has very fine continuous pores.
- the IPA flow rate was 1.19 ml / min ⁇ cm 3 .
- a stretched test body (a bonded body of a support layer and a PTFE porous membrane) was further produced twice.
- the obtained test specimens after stretching are designated as NM2 and NM3, respectively.
- the average flow pore sizes of NM2 and NM3 were 30.7 nm and 32.9 nm, respectively.
- IPA flow rate of NM2 and NM3 were respectively 0.97 ml / min ⁇ cm 3 and 1.05 ml / min ⁇ cm 3.
- Example 1 AQUIVION DISPERSION AC D83-24B (manufactured by Solvay Special Polymers Japan Co., Ltd., fluorine-based ion exchange resin: solid content 24 mass%, glass transition temperature: about 220 ° C.) was diluted 20 times, and PTFE of NM2 obtained above was diluted On the porous membrane side, it was uniformly applied with feathers so as to be 12 ml per 1 m 2 of the membrane.
- PORFLON HP-045-30 extended PTFE porous material manufactured by Sumitomo Electric Fine Polymer Co., Ltd., average flow pore size: 152.0 nm, IPA flow rate: 13.88 ml / min ⁇ cm 3
- the mixture was heated for 120 minutes to bond NM2 and Poreflon HP-045-30 (reinforcing layer).
- the average flow pore size is 33.6 nm (109.4% with respect to 30.7 nm before bonding)
- the IPA flow rate is 0.88 ml / min ⁇ cm 3 (0.97 ml / min before bonding).
- ⁇ cm 3 against was 90.7%).
- Comparative Example 1 Except that the bonding temperature was set to 120 ° C., NM2 and poreflon HP-045-30 (reinforcing layer) were bonded in the same manner as in Example 1, but sufficient bonding was not obtained.
- Example 2 Algoflon AD-60 (Amorphous fluororesin, manufactured by Solvay Special Polymers Japan, glass transition temperature: 125 ° C.) is added to 35 ml of IPA and 86 ml of water and mixed with a homogenizer to produce an adhesive solution having a solid content concentration of 1% by mass. did.
- This adhesive solution was uniformly applied to the PTFE porous membrane side of NM3 obtained above with feathers so as to be 12 ml per 1 m 2 of the membrane.
- PORFLON HP-045-30 extended PTFE porous material manufactured by Sumitomo Electric Fine Polymer Co., Ltd., average flow pore size: 152.0 nm, IPA flow rate: 13.88 ml / min ⁇ cm 3
- the mixture was heated for 120 minutes to bond NM3 and Poreflon HP-045-30 (reinforcing layer).
- the average flow pore size after bonding is 32.0 nm (97.3% with respect to 32.9 nm before bonding), and the IPA flow rate is 0.94 ml / min ⁇ cm 3 (1.05 ml / min before bonding). ⁇ cm 3 against 89.5%).
- Comparative Example 2 FEP (melting point 260 ° C.) was uniformly applied with feathers to the PTFE porous membrane side of NM1 obtained above.
- Poreflon HP-045-30 extended PTFE porous material manufactured by Sumitomo Electric Fine Polymer Co., Ltd., average flow pore size: 152.0 nm, IPA flow rate: 13.88 ml / min ⁇ cm 3
- Heating was performed for 120 minutes, and NM1 and Poreflon HP-045-30 (reinforcing layer) were bonded, but sufficient bonding was not obtained.
- Comparative Example 3 NM1 and Poreflon HP-045-30 (reinforcing layer) were bonded in the same manner as in Comparative Example 2 except that the bonding temperature was 270 ° C. After bonding, the average flow pore size is 43.4 nm (132.7% with respect to 32.7 nm before bonding), and the IPA flow rate is 1.28 ml / min ⁇ cm 3 (1.19 ml / min before bonding). ⁇ cm 3 against was 107.6%).
- AQUIVION DISPERSION AC D83-24B fluorine ion exchange resin having a glass transition temperature of about 220 ° C.
- Algoflon AD-60 amorphous fluororesin having a glass transition temperature of 125 ° C.
- Comparative Example 1 120 ° C. with respect to glass transition temperature 220 ° C.
- Comparative Example 2 250 ° C. with respect to melting point 260 ° C.
- Example 3 The composite made of NM2 and Porefluoron HP-045-30 (reinforcing layer) obtained in Example 1 was folded in half at the center line, and a stainless steel roller having a diameter of 50 mm was rolled on the fold. Thereafter, the composite was expanded and the average flow pore size and the IPA flow rate were measured. From these results, it is considered that the PTFE porous composite of the present invention is less likely to cause damage to the membrane or enlarge the pore diameter at the folded portion of the fold even when it is pleated.
Abstract
Description
(2)本発明の別の態様は、又、PTFEを主体とする無孔質のフッ素樹脂膜とその支持層である多孔質層の貼り合せ体を延伸して前記無孔質のフッ素樹脂膜をPTFE多孔質膜とする工程、前記PTFE多孔質膜の表面に接着剤層を形成する工程、及び前記接着剤層に多孔質の補強層を接着する工程を有し、前記接着剤層が、融点又は融点が存在しない場合はガラス転移点が260℃未満のフッ素樹脂の層であり、及び前記補強層を接着する工程が、前記融点又はガラス転移点以上の温度でかつ260℃未満の温度で行われるPTFE多孔質複合体の製造方法である。
47mmφの大きさに打ち抜いたサンプルの重量を測定し、その重量と、サンプルの体積(面積×厚さ)、フッ素樹脂(PTFE)の真比重2.25g/cm3から気孔率を算出した。
細孔分布測定器(パームポロメータ CFP-1500A:Porous Materials,Inc製)により、液体として、GALWICK(プロピレン,1,1,2,3,3,3酸化ヘキサフッ酸(Porous Materials,Inc製)を用いて測定した。具体的には、次のようにして求められる。先ず、膜に加えられる差圧と膜を透過する空気流量との関係を、膜が乾燥している場合と膜が液体で濡れている場合について測定し、得られたグラフをそれぞれ、乾き曲線及び濡れ曲線とする。乾き曲線の流量を1/2とした曲線と、濡れ曲線との交点における差圧をP(Pa)とする。次の式により、平均流量径を求める。
平均流量径d(μm)=cγ/P
ここで、cは定数で2860であり、γは液体の表面張力(dynes/cm)である。
イソプロピルアルコール(IPA)を、0.1MPaの差圧で透過させたときの、単位面積(1cm2)当たりの流量を測定した。
PTFEディスパージョンAD911(旭硝子社製)、MFAラテックス(ソルベイスペシャルポリマーズジャパン社製)及びPFAディスパージョン920HP(固形分60質量%;三井デュポンフロロケミカル社製)を用いた。MFA/(PTFE+MFA+PFA)(フッ素樹脂固形分の体積比率)及びPFA/(PTFE+MFA+PFA)(フッ素樹脂固形分の体積比率)が各2%であるフッ素樹脂ディスパージョンを調整し、さらに分子量200万のポリエチレンオキサイドを濃度3mg/mlとなるように添加してフッ素樹脂ディスパージョンを調整した。
厚さ50μmのアルミ箔をガラス平板の上に皺がないように広げて固定した。前記で得られたフッ素樹脂ディスパージョンを滴下した後、日本ベアリング社製のステンレス鋼製のスライドシャフト(商品名:ステンレスファインシャフトSNSF型、外径20mm)を転がすようにしてフッ素樹脂ディスパージョンをアルミ箔一面に均一になるように伸ばした。
AQUIVION DISPERSION AC D83-24B(ソルベイスペシャルポリマーズジャパン社製、フッ素系イオン交換樹脂:固形分24質量%、ガラス転移温度:約220℃)を20倍に希釈して、前記で得られたNM2のPTFE多孔質膜側に、膜の1m2に対し12mlとなるように、羽毛で均一に塗布した。塗布層上に、ポアフロンHP-045-30(住友電工ファインポリマー社製延伸PTFE多孔質体、平均流量孔径:152.0nm、IPA流量:13.88ml/分・cm3)を貼り合せ、220℃×120分で加熱し、NM2とポアフロンHP-045-30(補強層)の接着を行った。接着後の、平均流量孔径は、33.6nm(接着前の30.7nmに対して109.4%)であり、IPA流量は0.88ml/分・cm3(接着前の0.97ml/分・cm3に対して90.7%)であった。
接着の温度を120℃とした以外は、実施例1と同様にしてNM2とポアフロンHP-045-30(補強層)の接着を行ったが、充分な接着は得られなかった。
アルゴフロンAD-60(アモルフアスフッ素樹脂、ソルベイスペシャルポリマーズジャパン社製、ガラス転移温度:125℃)をIPA35ml及び水86mlに加え、ホモジナイザーで混合して固形分濃度1質量%の接着剤液を作製した。この接着剤液を、前記で得られたNM3のPTFE多孔質膜側に、膜の1m2に対し12mlとなるように、羽毛で均一に塗布した。塗布層上に、ポアフロンHP-045-30(住友電工ファインポリマー社製延伸PTFE多孔質体、平均流量孔径:152.0nm、IPA流量:13.88ml/分・cm3)を貼り合わせ、150℃×120分で加熱し、NM3とポアフロンHP-045-30(補強層)の接着を行った。接着後の、平均流量孔径は、32.0nm(接着前の32.9nmに対して97.3%)であり、IPA流量は0.94ml/分・cm3(接着前の1.05ml/分・cm3に対して89.5%)であった。
FEP(融点260℃)を、前記で得られたNM1のPTFE多孔質膜側に、羽毛で均一に塗布した。塗布層上に、ポアフロンHP-045-30(住友電工ファインポリマー社製延伸PTFE多孔質体、平均流量孔径:152.0nm、IPA流量:13.88ml/分・cm3)を貼り合せ、250℃×120分で加熱し、NM1とポアフロンHP-045-30(補強層)の接着を行ったが、充分な接着は得られなかった。
接着の温度を270℃とした以外は、比較例2と同様にしてNM1とポアフロンHP-045-30(補強層)の接着を行った。接着後の、平均流量孔径は、43.4nm(接着前の32.7nmに対して132.7%)であり、IPA流量は1.28ml/分・cm3(接着前の1.19ml/分・cm3に対して107.6%)であった。
実施例1で得られたNM2とポアフロンHP-045-30(補強層)からなる複合体をその中心線で二つ折りし、その折目上に径50mmのステンレス鋼製ローラを転がした。その後、複合体を広げて平均流量孔径とIPA流量を測定したが、二つ折り前とほとんど変化がなかった。この結果より、本発明のPTFE多孔質複合体は、プリーツ状とした場合でも、折りひだの折り曲げ部における膜の破損や孔径の拡大が生じにくいものと考えられる。
Claims (5)
- ポリテトラフルオロエチレン多孔質膜、前記ポリテトラフルオロエチレン多孔質膜を支持する多孔質の支持層、前記ポリテトラフルオロエチレン多孔質膜に接着している接着剤層、及び前記接着剤層に接着している多孔質の補強層を有し、前記接着剤層が、融点又は融点が存在しない場合はガラス転移点が260℃未満のフッ素樹脂の層であるポリテトラフルオロエチレン多孔質複合体。
- 前記融点又は融点が存在しない場合はガラス転移点が260℃未満のフッ素樹脂が、フッ素系イオン交換樹脂又はアモルフアスフッ素樹脂である請求項1のポリテトラフルオロエチレン多孔質複合体。
- 前記ポリテトラフルオロエチレン多孔質膜の平均流量孔径が40nmである請求項1又は請求項2のポリテトラフルオロエチレン多孔質複合体。
- 前記多孔質の補強層が、ポリテトラフルオロエチレン多孔質体である請求項1ないし請求項3のいずれか1項に記載のポリテトラフルオロエチレン多孔質複合体。
- ポリテトラフルオロエチレンを主体とする無孔質のフッ素樹脂膜とその支持層である多孔質層の貼り合せ体を延伸して前記無孔質のフッ素樹脂膜をポリテトラフルオロエチレン多孔質膜とする工程、前記ポリテトラフルオロエチレン多孔質膜の表面に接着剤層を形成する工程、及び前記接着剤層に多孔質の補強層を接着する工程を有し、前記接着剤層が、融点又は融点が存在しない場合はガラス転移点が260℃未満のフッ素樹脂の層であり、及び前記補強層を接着する工程が、前記融点又はガラス転移点以上の温度でかつ260℃未満の温度で行われるポリテトラフルオロエチレン多孔質複合体の製造方法。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0213560B2 (ja) | 1976-09-21 | 1990-04-04 | Mitsubishi Electric Corp | |
WO2008018400A1 (fr) * | 2006-08-09 | 2008-02-14 | Sumitomo Electric Fine Polymer, Inc. | Membrane de résine fluorée, composite de résine fluorée, composite poreux de résine fluorée, procédés pour la production de ceux-ci et élément de type membrane pour la séparation |
JP2010094579A (ja) * | 2008-10-14 | 2010-04-30 | Sumitomo Electric Fine Polymer Inc | 多孔質フッ素樹脂薄膜の製造方法及び多孔質フッ素樹脂薄膜 |
JP2011052175A (ja) * | 2009-09-04 | 2011-03-17 | Sumitomo Electric Fine Polymer Inc | ポリテトラフルオロエチレン多孔質膜、多孔質フッ素樹脂膜複合体及びそれらの製造方法 |
JP2012037120A (ja) * | 2010-08-05 | 2012-02-23 | Nihon Gore Kk | 隔膜およびこれを用いた熱交換器 |
JP2012045524A (ja) * | 2010-08-30 | 2012-03-08 | Fujifilm Corp | 結晶性ポリマー微孔性膜及びその製造方法、並びに濾過用フィルタ |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3620047B2 (ja) * | 1997-06-06 | 2005-02-16 | ダイキン工業株式会社 | 含フッ素接着剤ならびにそれを用いた接着性フィルムおよび積層体 |
KR100542783B1 (ko) | 1997-06-23 | 2006-01-11 | 다이낑 고오교 가부시키가이샤 | 테트라플루오로에틸렌 공중합체 및 그 용도 |
JP3851864B2 (ja) * | 2002-10-23 | 2006-11-29 | 住友電工ファインポリマー株式会社 | 多孔質複層中空糸および該多孔質複層中空糸を備えた濾過モジュール |
AU2004316360B2 (en) | 2004-02-27 | 2010-06-17 | Sumitomo Electric Industries, Ltd. | Composite structure and process for producing the same |
CN100572035C (zh) * | 2006-11-30 | 2009-12-23 | 中国人民解放军总后勤部军需装备研究所 | 一种聚四氟乙烯多层复合膜及其防护材料的制备方法 |
WO2010092938A1 (ja) | 2009-02-16 | 2010-08-19 | 住友電工ファインポリマー株式会社 | 多孔質複層フィルターおよびその製造方法 |
JP2012176361A (ja) | 2011-02-25 | 2012-09-13 | Sumitomo Electric Fine Polymer Inc | 多孔質複層フィルター |
US20130112621A1 (en) * | 2011-11-03 | 2013-05-09 | Lei Zheng | Water filtration article and related methods |
JP6069221B2 (ja) * | 2011-12-05 | 2017-02-01 | 住友電工ファインポリマー株式会社 | ポリテトラフルオロエチレン製多孔質樹脂膜、ポリテトラフルオロエチレン製多孔質樹脂膜複合体、及び分離膜エレメント |
-
2013
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-
2014
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0213560B2 (ja) | 1976-09-21 | 1990-04-04 | Mitsubishi Electric Corp | |
WO2008018400A1 (fr) * | 2006-08-09 | 2008-02-14 | Sumitomo Electric Fine Polymer, Inc. | Membrane de résine fluorée, composite de résine fluorée, composite poreux de résine fluorée, procédés pour la production de ceux-ci et élément de type membrane pour la séparation |
JP4371176B2 (ja) | 2006-08-09 | 2009-11-25 | 住友電工ファインポリマー株式会社 | フッ素樹脂薄膜、フッ素樹脂複合体及びその製造方法、多孔質フッ素樹脂複合体、並びに分離膜エレメント |
JP2010094579A (ja) * | 2008-10-14 | 2010-04-30 | Sumitomo Electric Fine Polymer Inc | 多孔質フッ素樹脂薄膜の製造方法及び多孔質フッ素樹脂薄膜 |
JP2011052175A (ja) * | 2009-09-04 | 2011-03-17 | Sumitomo Electric Fine Polymer Inc | ポリテトラフルオロエチレン多孔質膜、多孔質フッ素樹脂膜複合体及びそれらの製造方法 |
JP2012037120A (ja) * | 2010-08-05 | 2012-02-23 | Nihon Gore Kk | 隔膜およびこれを用いた熱交換器 |
JP2012045524A (ja) * | 2010-08-30 | 2012-03-08 | Fujifilm Corp | 結晶性ポリマー微孔性膜及びその製造方法、並びに濾過用フィルタ |
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