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WO2018116517A1 - Membrane poreuse en polytétrafluoroéthylène, membrane respirante étanche à l'eau et élément respirant étanche à l'eau l'utilisant - Google Patents

Membrane poreuse en polytétrafluoroéthylène, membrane respirante étanche à l'eau et élément respirant étanche à l'eau l'utilisant Download PDF

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Publication number
WO2018116517A1
WO2018116517A1 PCT/JP2017/027835 JP2017027835W WO2018116517A1 WO 2018116517 A1 WO2018116517 A1 WO 2018116517A1 JP 2017027835 W JP2017027835 W JP 2017027835W WO 2018116517 A1 WO2018116517 A1 WO 2018116517A1
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Prior art keywords
porous membrane
ptfe
membrane
average
ptfe porous
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English (en)
Japanese (ja)
Inventor
鉄兵 手塚
陽三 矢野
大村　和弘
笠置　智之
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Nitto Denko Corp
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Nitto Denko Corp
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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
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof

Definitions

  • the present invention relates to a polytetrafluoroethylene (PTFE) porous membrane, a waterproof ventilation membrane and a waterproof ventilation member using the same.
  • PTFE polytetrafluoroethylene
  • Waterproof waterproof breathable membranes may be attached to vehicle electrical components such as lamps, pressure sensors, ECUs (Electronic Control Units), secondary battery storage cases, and various electrical products. Installation of a waterproof breathable membrane secures a ventilation path between the outside and inside of the housing, relieves pressure fluctuations inside the housing due to temperature changes, and releases gas generated inside the housing to the outside I can do it. Further, the waterproof breathable membrane can suppress the entry of foreign matters such as water and / or dust from the outside to the inside of the housing through the ventilation path.
  • Patent Document 1 discloses a PTFE porous membrane that can be used as a waterproof breathable membrane.
  • Resin having a relatively high hygroscopic property such as polyamide (PA), polycarbonate (PC), and polybutylene terephthalate (PBT) may be used for electrical parts and electrical product casings.
  • a housing using such a resin absorbs surrounding water vapor, but the absorbed water vapor is released by heat from a heat source inside the housing or heat from outside such as sunlight, and part of it is released. Stays inside the housing. It is desired that the accumulated water vapor inside the housing is discharged to the outside of the housing as quickly as possible.
  • An object of the present invention is to provide a porous PTFE membrane that can quickly discharge water vapor retained inside the casing to the outside of the casing when attached to the casing as a waterproof breathable membrane.
  • the present invention Provided is a polytetrafluoroethylene porous membrane having a moisture permeability of 150,000 g / (m 2 ⁇ day) or more measured in accordance with JIS L1099 (B-1 method).
  • the present invention provides: Provided is a waterproof gas-permeable membrane comprising the PTFE porous membrane of the present invention.
  • the present invention provides: A waterproof breathable member comprising the waterproof breathable membrane of the present invention and a support joined to the waterproof breathable membrane is provided.
  • the PTFE porous membrane according to the present invention has an unprecedented high moisture permeability in the film thickness direction.
  • High moisture permeability means that the permeation rate of water vapor due to diffusion in the porous membrane is high.
  • water vapor staying inside the housing can be discharged to the outside of the housing more quickly.
  • air permeability air permeability
  • FIG. 1 is a schematic diagram for explaining the influence of the average node area ratio of the PTFE porous film on the moisture permeability in the film thickness direction.
  • FIG. 2 is a schematic diagram for explaining the influence of the average fibril length of the film on the moisture permeability in the film thickness direction of the PTFE porous film.
  • FIG. 3 is a schematic diagram for explaining the influence of the average node length of the film on the moisture permeability in the film thickness direction of the PTFE porous film.
  • FIG. 4 is a schematic diagram for explaining an example of a membrane structure that the PTFE porous membrane of the present invention may have.
  • FIG. 5 is a cross-sectional view schematically showing an example of the waterproof breathable membrane of the present invention.
  • FIG. 6 is a perspective view schematically showing an example of the waterproof ventilation member of the present invention.
  • FIG. 7 is a plan view schematically showing an example of the waterproof ventilation member of the present invention.
  • FIG. 8 is a diagram showing an observation image of the PTFE porous membrane produced in Example 1 with a scanning electron microscope (SEM).
  • FIG. 9 is an SEM observation image of the porous PTFE membrane produced in Example 2.
  • FIG. 10 is a view showing an SEM observation image of the PTFE porous membrane produced in Comparative Example 1.
  • FIG. 11 is a view showing an SEM observation image of the PTFE porous membrane produced in Comparative Example 2.
  • the porous PTFE membrane according to the first aspect of the present disclosure is a membrane having a moisture permeability of 150,000 g / (m 2 ⁇ day) or more measured in accordance with the provisions of JIS L1099 (B-1 method). is there.
  • the PTFE porous membrane according to the first aspect has an average fibril length of 50 ⁇ m or more, an average node length of 5 times or more of the average fibril length, and an average node area ratio. Is a film of 5% or less.
  • the PTFE porous film according to the second aspect is a film having an average node area ratio of 3% or less.
  • the PTFE porous film according to the second or third aspect is a film having an average curvature in the film thickness direction of 1.5 or less.
  • the PTFE porous membrane according to any one of the first to fourth aspects is measured in accordance with the provisions of the water resistance test method B (high water pressure method) of JIS L1092.
  • the film has a water pressure resistance of 10 kPa or higher.
  • the PTFE porous film according to any one of the first to fifth aspects is a film having a porosity of 90% or more.
  • the waterproof gas-permeable membrane according to the seventh aspect of the present disclosure includes the PTFE porous membrane according to any one of the first to sixth aspects.
  • a waterproof ventilation member includes the waterproof ventilation film according to the seventh aspect and a support joined to the waterproof ventilation film.
  • the moisture permeability in the film thickness direction measured in accordance with the provisions of JIS L1099 (Method B-1) is 150,000 g / (m 2 ⁇ day) or more.
  • the moisture permeability 150000g / (m 2 ⁇ day ) Ultra, 155000g / (m 2 ⁇ day ) or more, 160000g / (m 2 ⁇ day ) or more, 180000g / (m 2 ⁇ day ) Or more, and further 200,000 g / (m 2 ⁇ day) or more.
  • the upper limit of the moisture permeability is not limited and is, for example, 300,000 g / (m 2 ⁇ day) or less.
  • the moisture permeability in the film thickness direction measured in accordance with JIS Z0208 is, for example, 9000 g / (m 2 ⁇ day) or more, porous the configuration of the quality film, 10000g / (m 2 ⁇ day ) or more, further can be a 11000g / (m 2 ⁇ day) or more.
  • the upper limit of the moisture permeability is not limited and is, for example, 16000 g / (m 2 ⁇ day) or less.
  • the configuration of the porous PTFE membrane of the present invention is not limited.
  • the PTFE porous membrane of the present invention is, for example, a membrane having an average fibril length of 50 ⁇ m or more, an average node length of 5 times or more of the average fibril length, and an average node area ratio of 5% or less.
  • the PTFE porous membrane of the present invention having the membrane structure is referred to as a porous membrane A.
  • the PTFE porous membrane is generally composed of nodes (nodules) which are aggregated portions of PTFE and countless fibrils which are fine fibrous structures having both ends bonded to the nodes. Adjacent nodes are connected by fibrils.
  • the PTFE porous membrane has air permeability in the film thickness direction using the space (pores) between adjacent fibrils as a ventilation path.
  • the PTFE porous membrane is also referred to as a stretched porous membrane, and is formed by stretching a PTFE sheet that is an aggregate of PTFE. Nodes and fibrils are formed by the stretching of the PTFE sheet, and these configurations vary depending on, for example, the stretching conditions of the PTFE sheet.
  • PTFE porous membrane A has a specific range of average fibril length, average node length, and average node area ratio. Thereby, the PTFE porous membrane A exhibits high moisture permeability in the film thickness direction.
  • the water vapor When passing through the PTFE porous membrane, the water vapor must diffuse and move so as to avoid the membrane nodes and fibrils. At this time, if the structure of the node and fibril is such that the water vapor diffusion path in the film thickness direction is as straight as possible in the film thickness direction of the porous film, the moisture permeability in the film thickness direction of the porous film is increased. . According to the average fibril length, the average node length, and the average node area in the specific range, such a water vapor diffusion path in the PTFE porous membrane is realized.
  • FIG. 1 when the PTFE porous membrane 1 is viewed in a cross section in the thickness direction, a plurality of nodes 2 exist in both the in-plane direction and the thickness direction of the porous membrane 1 in the cross section. ing.
  • FIG. 1 and FIGS. 2 and 3 below it is assumed that the node 2 extends in the same direction in order to simplify the description and make it easy to understand.
  • the water vapor 3 to diffuse and move the porous film 1 in the film thickness direction must move so as to avoid the node 2 that becomes an obstacle to diffusion.
  • the water vapor 3 that has passed between the nodes 2a and 2b cannot be diffused and moved linearly in the thickness direction of the porous film 1 due to the presence of the node 2c. Forced to take. Then, such avoidance of the node 2 is repeated innumerably until the water vapor 3 passes through the porous film 1 in the film thickness direction.
  • the moisture permeability of the porous membrane 1 is higher as the water vapor diffusion path 4 is closer to a straight line, and lower as it deviates from the straight line.
  • the average node area ratio in the PTFE porous membrane A is 5% or less, and the water vapor that permeates through the porous membrane in the film thickness direction can alleviate the obstacle caused by the node 2 on the diffusion path 4 and diffuse.
  • the path 4 can be made closer to a straight line extending in the film thickness direction.
  • the average node area ratio in the PTFE porous membrane A is preferably 3% or less, and more preferably 2.5% or less.
  • the lower limit of the average node area ratio is, for example, 1.0%.
  • the waterproof property can be maintained even when the PTFE porous membrane A is used as a waterproof breathable membrane.
  • both ends of the fibril 5 of the PTFE porous membrane 1 (only one is shown for the sake of simplicity and easy understanding) are nodes 2 It is connected to the. That is, the average length of fibrils 5 (average fibril length) reflects the distance d between adjacent nodes 2.
  • the longer the average fibril length the longer the distance between adjacent nodes 2 is.
  • a PTFE porous membrane having a long distance between adjacent nodes 2 it is possible to alleviate the obstacle caused by the node 2 on the diffusion path 4 with respect to water vapor that permeates through the porous film in the film thickness direction. Can be made closer to a straight line extending in the film thickness direction.
  • the average fibril length in the PTFE porous membrane A is 50 ⁇ m or more, and the distance between adjacent nodes is long. Although the moisture permeability is improved by increasing the average fibril length, an excessively long average fibril length with a small average node area ratio may reduce the strength and / or waterproofness of the porous membrane. Considering this, the upper limit of the average fibril length in the PTFE porous membrane A is preferably 90 ⁇ m or less. When the average fibril length is 90 ⁇ m or less, even when the PTFE porous membrane A is used as a waterproof breathable membrane, the waterproof property can be improved more reliably.
  • the water vapor that diffuses and moves the PTFE porous membrane 1 in the film thickness direction moves not only the nodes 2 but also the spaces (pores) between the fibrils 5 so as to avoid the fibrils 5.
  • both ends of the fibril 5 of the PTFE porous membrane are connected to the node 2.
  • the porous membrane having a large average fibril length as described above when the ratio of the average node length to the average fibril length is small as shown in FIG.
  • the average node length in the PTFE porous membrane A is 5 times or more the average fibril length.
  • the upper limit of the ratio of the average node length to the average fibril length is, for example, 15.
  • the air permeability of the PTFE porous membrane is not affected by the average fibril length, average node length (ratio of average node length to average fibril length), and average node area ratio as much as moisture permeability. This is based on the premise that there is a pressure difference between both main surfaces of the PTFE porous membrane for the air permeability, that is, about the movement of air passing through the PTFE porous membrane when discussing the air permeability. It is based on the fact that fluid movement dominates rather than diffusion movement. The air permeability of the PTFE porous membrane is more strongly affected by the average pore size of the membrane.
  • the average fibril length, the average node length, and the average node area ratio of the PTFE porous membrane are values obtained as follows.
  • Magnified images of the main surface of the porous PTFE membrane to be evaluated are obtained by means such as a scanning electron microscope (SEM) at least five by changing the location on the main surface.
  • Means for obtaining an enlarged image is not limited to SEM, and any means can be used as long as the form of the node and fibril of the porous film can be sufficiently confirmed.
  • each enlarged image is subjected to image analysis to evaluate the length of at least 10 nodes and the length of at least 10 fibrils in an observation area of 1250 ⁇ m ⁇ 850 ⁇ m.
  • the nodes and fibrils whose length is to be evaluated include the nodes and fibrils having the smallest length existing in the observation region and the nodes and fibrils having the largest length existing in the observation region.
  • an average value of the lengths of all evaluated nodes and fibrils (both at least 50 or more) is obtained, and this is used as the average node length and the average fibril length. Further, the above-mentioned observation area of 1250 ⁇ m ⁇ 850 ⁇ m in the enlarged image is image-analyzed, and the area ratio (%) of the node is evaluated by the pixel ratio on the image, and the average of the area ratios obtained among the at least five enlarged images A value is obtained and this is taken as the average node area ratio of the porous membrane.
  • the nodes in the PTFE porous membrane A can extend predominantly in a predetermined direction.
  • the direction is, for example, the TD direction of the porous film, and the TD direction is typically the width direction when the PTFE porous film has a strip shape.
  • a node in the PTFE porous membrane A can have a high aspect ratio that is a ratio of a length to a width without much change in the width in the extending direction of the node.
  • the aspect ratio (length / width) is, for example, 5 or more, and may be 20 or more.
  • the width of the node is, for example, 0.3 ⁇ m or more, and can be 1 ⁇ m or more, or 2 ⁇ m or more.
  • the upper limit of the node width is, for example, 20 ⁇ m.
  • the proportion of short nodes is small.
  • the ratio of the area occupied by nodes having a node length of less than 50 ⁇ m to the total node area may be 10% or less.
  • the PTFE porous membrane A has a low node area ratio of 5% or less, while having an average node length of 5 times or more of a large average fibril length of 50 ⁇ m or more.
  • the fibrils in the PTFE porous membrane A can extend predominantly in a direction substantially perpendicular to the extending direction of the nodes.
  • the direction is, for example, the MD direction of the porous membrane, and the MD direction is typically the longitudinal direction when the PTFE porous membrane is strip-shaped.
  • the average curvature in the film thickness direction can be 1.5 or less.
  • the average curvature is a value represented by the ratio L / L 0 of the average length L of the water vapor diffusion path 4 with respect to the thickness L 0 of the porous film to be evaluated.
  • the diffusion path 4 means the shortest path of water vapor diffusion that extends in the thickness direction of the porous PTFE membrane while avoiding the nodes 2 and fibrils 5.
  • the average length L of the diffusion path 4 is governed by the structure of the PTFE porous membrane, more specifically, the structure of the node 2 and the fibril 5. As the average curvature approaches 1, the diffusion path 4 approaches a straight line extending in the film thickness direction of the porous membrane 1, and the moisture permeability of the PTFE porous membrane becomes higher.
  • the average curvature in the film thickness direction of the PTFE porous membrane A can be 1.3 or less.
  • a PTFE porous membrane that has been subjected to the sticking process described later may have such a low average curvature.
  • the average curvature in the film thickness direction of the PTFE porous membrane is a value determined as follows.
  • a three-dimensional image including a cross section in the thickness direction of the PTFE porous membrane as an evaluation object is obtained by means such as X-ray CT.
  • This means may be any means as long as the morphology of the node and fibril of the porous film in the cross section can be sufficiently observed.
  • the cross section in the thickness direction of the film represented in the obtained three-dimensional image is subjected to image processing, and the center line of the space excluding the nodes and fibrils is extracted.
  • At least 100 shortest paths that pass through the extracted center line and penetrate the porous membrane in the thickness direction thereof are selected by image processing per region having a width of 15 ⁇ m, and the selected shortest path
  • the average value of the length of the diffusion path 4 in the PTFE porous membrane as the evaluation object is obtained.
  • the average curvature of the porous membrane can be obtained.
  • the PTFE porous membrane of the present invention may have a porosity of 90% or more, for example.
  • the porosity can be 93% or more.
  • the porosity can be determined as follows.
  • the moisture permeability of the PTFE porous membrane of the present invention can be improved by 20% or more by the sticking treatment described later depending on the configuration of the porous membrane.
  • the water pressure resistance of the PTFE porous membrane of the present invention is, for example, 10 kPa or more, depending on the configuration of the porous membrane. 20 kPa or more.
  • a porous PTFE membrane can be used for a waterproof breathable membrane, and more specifically, a waterproof breathable membrane used for a housing of an electrical component such as a lamp.
  • the use of the PTFE porous membrane of the present invention is not limited to a waterproof breathable membrane.
  • the PTFE porous membrane A may have a waterproof property based on an average fibril length in a specific range and an average node length having a large ratio with respect to the average fibril length although the average node area ratio is small.
  • the thickness of the PTFE porous membrane of the present invention is, for example, 5 to 60 ⁇ m, preferably 20 to 40 ⁇ m.
  • the PTFE porous membrane of the present invention may be subjected to liquid repellent treatment such as water repellent treatment and oil repellent treatment.
  • liquid repellent treatment of the PTFE porous membrane can be performed by coating a liquid repellent material such as a fluorine compound, and a known method can be adopted for the coating.
  • the fibril has a branched portion.
  • the branch portion 6 is located between a pair of nodes 2 to which the fibril 5 having the branch portion 6 is connected at both ends.
  • the branch unit 6 is a branch between the fibrils 5, and is not a branch between the node 2 and the fibril 5.
  • Such a branched portion 6 is formed, for example, by performing a sticking process for bundling a plurality of adjacent fibrils 5 on the PTFE porous membrane. Two or more branch portions 6 can exist between the pair of nodes 2.
  • the fibril 5 In a section where the fibrils 5 located between the branch portions 6 and the branch portions 6 are bundled (bundling portion 7), the fibril 5
  • the width of can be large.
  • the width of the fibril 5 in the bundling portion 7 is, for example, 5 to 50 times the width of the non-bundled fibril 5 other than the bundling portion 7, and a specific numerical value is, for example, 0.5 to 5 ⁇ m. It is possible.
  • the branch part 6 and the binding part 7 are fiber structures in which a plurality of fibrils 5 once formed by stretching of the PTFE sheet are combined.
  • the average fibril length, the average node length, and the average node area ratio may be in the ranges described above in the description of the PTFE porous membrane A. Further, the gap 8 between the adjacent bundling portions 7 is expanded by bundling a plurality of adjacent fibrils. For this reason, in this embodiment, the moisture permeability in the film thickness direction can be further improved.
  • the fibril 5 can be a fibril that predominantly extends in a predetermined direction, for example, a direction substantially perpendicular to the direction in which the node extends.
  • the PTFE porous membrane having an average fibril length of 50 ⁇ m or more, an average node length of 5 times or more of the average fibril length, and an average node area ratio of 5% or less is independent of moisture permeability in the film thickness direction. It is a novel membrane.
  • This film can have each structure and each characteristic of the film
  • the waterproof breathable membrane of the present invention includes the above-described PTFE porous membrane of the present invention.
  • the specific use and usage as a waterproof breathable membrane are not limited.
  • the waterproof gas-permeable membrane of the present invention is attached to a vehicle electrical component such as a lamp, a pressure sensor, an ECU, a secondary battery storage case or the like, or a case of various electrical products, and more specifically, to the opening of the case. It can be used by attaching it to cover the opening.
  • a waterproof air-permeable membrane for example, air permeability between the inside and the outside of the housing can be ensured while suppressing entry of foreign matters such as dust and / or water into the inside of the housing.
  • the waterproof breathable membrane of the present invention can have high moisture permeability in the film thickness direction. Thereby, for example, the water vapor staying inside the casing due to the above-described causes can be quickly discharged to the outside of the casing.
  • the thickness of the waterproof breathable membrane of the present invention is, for example, 5 to 60 ⁇ m, preferably 20 to 40 ⁇ m.
  • the waterproof breathable membrane of the present invention may be colored.
  • the color of the PTFE porous membrane not subjected to the coloring treatment and the color of the waterproof gas-permeable membrane provided with the porous membrane are usually white.
  • the membrane When such a waterproof breathable membrane is disposed so as to block the opening of the housing, the membrane may be noticeable.
  • the conspicuous membrane stimulates the user's curiosity, and the function as a waterproof breathable membrane may be impaired by piercing with a needle or the like.
  • the waterproof gas-permeable membrane is colored, for example, by using a membrane having the same color as or a color similar to the color of the housing, the user's attention can be relatively suppressed.
  • a colored waterproof breathable membrane may be required, and such a request can be met by a coloring process.
  • the coloring treatment can be performed, for example, by dyeing the PTFE porous membrane or adding a colorant to the PTFE porous membrane.
  • the coloring treatment may be performed so that light included in a wavelength range of 380 nm to 500 nm is absorbed.
  • the waterproof gas-permeable membrane can be colored blue, gray, brown, pink, green, yellow, and the like.
  • the waterproof breathable membrane may be colored in black, gray, brown or pink.
  • the waterproof gas-permeable membrane of the present invention can include any other member other than the PTFE porous membrane of the present invention.
  • the member is, for example, a breathable support layer 13 shown in FIG.
  • a waterproof breathable membrane 11 shown in FIG. 5 includes the PTFE porous membrane 12 of the present invention and a breathable support layer 13 disposed on one main surface of the porous membrane 12.
  • the arrangement of the breathable support layer 13 improves the strength as the waterproof breathable membrane 11, and also improves the handleability.
  • the air-permeable support layer 13 is preferably a layer having higher air permeability and moisture permeability in the thickness direction than the PTFE porous membrane 12.
  • a woven fabric, a nonwoven fabric, a net, or a mesh can be used.
  • the material constituting the air-permeable support layer 13 is, for example, polyester, polyethylene, or aramid resin.
  • the shape of the air-permeable support layer 13 may be the same as or different from the shape of the PTFE porous membrane 12. For example, it has a shape that is disposed only at the peripheral portion of the PTFE porous membrane 12 (specifically, when the PTFE porous membrane 12 is circular, it has a ring shape that is disposed only at the peripheral portion).
  • the air-permeable support layer 13 is disposed by a technique such as thermal welding with the PTFE porous membrane 12 or adhesion with an adhesive.
  • the breathable support layer 13 may be disposed on one main surface of the PTFE porous layer 12 or may be disposed on both main surfaces.
  • the waterproof gas-permeable membrane of the present invention can exhibit each characteristic exhibited by the above-mentioned PTFE porous membrane of the present invention.
  • the waterproof ventilation member 21 shown in FIG. 6 has a waterproof ventilation membrane 11 having a circular shape when viewed from a direction perpendicular to the main surface of the membrane, and a support body that is a ring-shaped sheet joined to the peripheral edge of the membrane 11. 22.
  • the form in which the support 22 is joined to the waterproof gas-permeable membrane 11 reinforces the waterproof gas-permeable membrane 11 and improves the handleability.
  • the support body 22 becomes an allowance to the part to which the waterproof ventilation member 21 is arrange
  • the shape of the support 22 is not limited. For example, as shown in FIG. 7, even if the support 22 is a frame-like sheet bonded to the peripheral edge of the waterproof breathable membrane 11 having a rectangular shape when viewed from the direction perpendicular to the main surface of the membrane. Good. As shown in FIGS. 6 and 7, by making the shape of the support body 22 the shape of the peripheral edge portion of the waterproof gas-permeable membrane 11, the deterioration of the air permeability of the waterproof gas-permeable membrane 11 due to the arrangement of the support body 22 is suppressed. Moreover, the sheet-like support body 22 is preferable from the viewpoints of the handleability of the waterproof ventilation member 21 and the disposition property to the housing, particularly the disposition property within the housing. In the example shown in FIGS. 6 and 7, the waterproof gas-permeable membrane 11 is exposed except for the peripheral portion where the support 22 is disposed (both surfaces of the waterproof gas-permeable membrane 11 are exposed).
  • the material constituting the support 22 is, for example, a resin, a metal, or a composite material thereof.
  • the resin is, for example, a polyolefin such as polyethylene or polypropylene; a polyester such as PET or polycarbonate; a polyimide or a composite material thereof.
  • the metal is a metal having excellent corrosion resistance, such as stainless steel or aluminum.
  • the thickness of the support 22 is, for example, 5 to 500 ⁇ m, and preferably 25 to 200 ⁇ m.
  • the ring width (frame width: difference between the outer shape and the inner diameter) is suitably about 0.5 to 2 mm.
  • the support 22 may be a foam made of the above resin.
  • the joining method of the waterproof breathable membrane 11 and the support 22 is not particularly limited, and for example, methods such as heat welding, ultrasonic welding, adhesion with an adhesive, and adhesion with a double-sided tape can be employed.
  • the waterproof ventilation member 21 may include two or more waterproof ventilation membranes 11 and / or two or more supports 22.
  • the waterproof ventilation member of the present invention can be used for the same applications as conventional waterproof ventilation members.
  • the PTFE porous membrane of the present invention can be produced, for example, by the following method for producing a PTFE porous membrane.
  • the PTFE porous membrane of the present invention can be a membrane obtained by the following method for producing a PTFE porous membrane.
  • An unsintered PTFE sheet is stretched in a predetermined direction at a stretching temperature not lower than the melting point of PTFE and a stretching linear velocity not higher than 1.0 m / min (stretching A);
  • the sheet stretched by stretching A is further stretched in a direction different from the predetermined direction (stretching B).
  • the specific method is not particularly limited as long as the unsintered PTFE sheet is stretched at a stretching linear velocity of 1.0 m / min or less at a temperature equal to or higher than the melting point (327 ° C.) of PTFE.
  • an unfired PTFE sheet may be stretched while maintaining a stretching linear velocity of 1.0 m / min or less in a heating furnace maintained at a temperature equal to or higher than the melting point.
  • an aggregated portion of PTFE that can be called a precursor of the node, which can be a long node after the stretching B, although the area ratio to the area of the film is small can be formed.
  • a plurality of the agglomerated portions can be formed on the PTFE sheet in a state where adjacent agglomerated portions are nearly parallel to each other.
  • the direction in which the agglomerated portion extends is typically a direction substantially perpendicular to the stretching direction of the stretching A in the sheet surface.
  • fibrils that can achieve an average fibril length of 50 ⁇ m or more after the stretching B can be formed.
  • the direction in which the fibrils extend may be a direction substantially perpendicular to the direction in which the aggregated portion extends in the sheet surface.
  • the direction of stretch A is not particularly limited, but may be, for example, the MD direction of a PTFE sheet, and may be the longitudinal direction when the sheet is strip-shaped.
  • the draw ratio of the stretch A is, for example, 8 to 50 times, preferably 15 to 35 times.
  • the temperature at which the stretching A is performed may be not less than the melting point of PTFE, and is, for example, 350 to 420 ° C., preferably 360 to 400 ° C.
  • the drawing linear velocity of drawing A is 1.0 m / min or less, preferably 0.5 m / min or less.
  • the reference length of the drawing linear velocity is 1.5 m.
  • stretching with a drawing linear velocity of 1.0 m / min or less means that when a sheet having a reference length of 1.5 m is assumed, the sheet is drawn at a speed of 1.0 m / min or less in the direction of the reference length. Stretching to stretch. When a sheet is stretched by a pair of rolls having a difference in travel speed, the travel distance of the sheet between the pair of rolls (travel distance from leaving the previous roll to contacting the subsequent roll) is set as a reference length. Can do.
  • Extension B In the stretching B, the specific method is not limited as long as the PTFE sheet that has undergone the stretching A is stretched in a direction different from the direction of the stretching A.
  • the direction of stretching B is not particularly limited, but is typically a direction substantially perpendicular to the direction of stretching A in the sheet plane.
  • the direction of the stretching B is, for example, the TD direction of the PTFE sheet, and may be the width direction when the sheet is strip-shaped.
  • the draw ratio of stretch B is, for example, 2 to 15 times, preferably 4 to 10 times.
  • the temperature (stretching temperature) at which the stretching B is performed may be equal to or higher than the melting point of PTFE or lower than the melting point, and is, for example, 100 to 400 ° C., preferably 120 to 200 ° C.
  • the drawing linear velocity of the drawing B is not limited, and is, for example, 3 m / min to 16 m / min.
  • any stretching other than stretching A and stretching B may be performed as necessary.
  • the first stretching performed on the PTFE sheet is preferably stretching A.
  • the stretching in the predetermined direction is preferably only the stretching A.
  • only stretching A and stretching B may be performed as stretching of the PTFE sheet. Stretching B may be carried out continuously following stretching A.
  • the formation method of the unsintered PTFE sheet used in the production method of the present disclosure is not particularly limited.
  • a mixture of PTFE fine powder (fine powder) and a liquid lubricant is obtained by at least one method selected from extrusion and rolling. It can be formed by forming into a sheet.
  • the liquid lubricant is preferably removed from the PTFE sheet by heating or extraction before the stretching A is performed.
  • the kind of PTFE fine powder is not particularly limited, and a commercially available product can be used.
  • Commercially available PTFE fine powder is, for example, Polyflon F-104 (Daikin Industries), Fullon CD-123, Fullon CD-129E (Asahi ICI Fluoropolymers), Teflon 6J (Mitsui / DuPont Fluorochemicals).
  • the liquid lubricant is not particularly limited as long as it can wet the surface of the fine PTFE powder and can be removed by means such as evaporation and / or extraction after the mixture is formed into a sheet.
  • Specific examples of the liquid lubricant are liquid paraffin, naphtha, white oil, toluene, xylene and other hydrocarbon oils, various alcohols, ketones and esters.
  • the mixing ratio of the PTFE fine powder and the liquid lubricant can be adjusted in accordance with the types of the PTFE fine powder and the liquid lubricant, the molding method of the PTFE sheet, and the like, and usually the liquid lubricant with respect to 100 parts by weight of the PTFE fine powder. Is about 5 to 50 parts by weight.
  • the specific method of extrusion and rolling is not particularly limited.
  • the obtained rod-shaped formed body may be formed into a sheet shape by rolling, or the mixture. May be extruded into a sheet.
  • the thickness of the unsintered PTFE sheet can be appropriately adjusted depending on the thickness of the porous PTFE membrane to be obtained, and is, for example, about 0.05 to 0.5 mm.
  • an optional step can be performed after stretching B as necessary.
  • the arbitrary processes are, for example, a baking process, a liquid repellent process, and a sticking process.
  • the PTFE sheet after stretching B (PTFE porous film formed through stretching B) is heated to a temperature equal to or higher than the melting point of PTFE and heat-treated.
  • the specific method of the heat treatment is not limited, and for example, the stretched PTFE sheet may be accommodated in a heating furnace maintained at a temperature equal to or higher than the melting point.
  • the heat treatment temperature is preferably about 350 to 400 ° C.
  • the heat treatment may be performed continuously following the stretching B.
  • the PTFE sheet after stretching B (PTFE porous film formed through stretching B) is brought into contact with a liquid having a low surface tension, so that stretching A in the predetermined direction and stretching in a different direction are performed.
  • This is a process of bundling a plurality of adjacent fibrils formed through B.
  • a PTFE porous membrane 1 as shown in FIG. 4 is formed.
  • the sticking treatment can be performed, for example, by immersing the PTFE sheet after stretching B in a low surface tension liquid.
  • the PTFE sheet immersed for a predetermined time may be dried after being taken out from the liquid. You may immerse the PTFE sheet after the extending
  • the liquid having a low surface tension may be a liquid having a low surface tension that can penetrate between the fine fibrils of the PTFE sheet (PTFE porous film) after stretching B.
  • the surface tension of the liquid is 30 mN / m or less, preferably 25 mN / m or less.
  • the said liquid is alcohol, ethers, such as methanol and ethanol, for example.
  • a commercially available liquid for example, a product made by 3M, hydrofluoroether Novec (registered trademark), can also be used.
  • the PTFE porous membrane A can be manufactured by the manufacturing method of the present disclosure.
  • the manufacturing method of the present disclosure may include arbitrary steps other than those described above.
  • Average fibril length, average node length, average node area ratio The average fibril length, average node length, and average node area ratio of the PTFE porous membrane were obtained by obtaining an enlarged image of the main surface of the PTFE porous membrane to be evaluated using SEM (manufactured by JEOL, JSM-6510LV). It calculated
  • Example 1 A PTFE paste was formed by uniformly mixing 100 parts by weight of PTFE fine powder (manufactured by Asahi ICI Fluoropolymers, Fullon CD-129E) and 19.7 parts by weight of aliphatic hydrocarbon as a liquid lubricant. Next, the formed PTFE paste was extruded into a sheet shape with a pressure of 2.5 MPa (25 kg / cm 2 ) using an FT die, and this was further rolled with a pair of metal rolls to adjust the thickness. PTFE sheet (thickness 0.2 mm) was obtained. Next, the obtained PTFE sheet was heated and dried to remove the liquid lubricant.
  • PTFE fine powder manufactured by Asahi ICI Fluoropolymers, Fullon CD-129E
  • aliphatic hydrocarbon as a liquid lubricant.
  • the film was uniaxially stretched in the longitudinal direction at a stretching linear velocity of 0.4 m / min in a heating furnace maintained at 360 ° C. (stretching A). .
  • the draw ratio at this time was 20 times.
  • Example 2 The PTFE porous membrane produced in Example 1 was impregnated with 3M-made hydrofluoroether Novec7300, thereby performing a sticking treatment on the porous membrane. The PTFE porous membrane after the impregnation was dried to obtain the PTFE porous membrane of Example 2.
  • An SEM observation image of the porous PTFE membrane of Example 2 is shown in FIG.
  • Example 3 A PTFE porous membrane of Example 3 was obtained in the same manner as Example 1 except that the drawing linear velocity of Drawing A was 0.8 m / min.
  • Example 4 The PTFE porous membrane produced in Example 3 was subjected to sticking treatment in the same manner as in Example 2 to obtain the PTFE porous membrane in Example 4.
  • a PTFE paste was formed by uniformly mixing 100 parts by weight of PTFE fine powder (manufactured by Asahi ICI Fluoropolymers, Fullon CD-129E) and 19.7 parts by weight of aliphatic hydrocarbon as a liquid lubricant.
  • the formed PTFE paste was extruded into a sheet shape with a pressure of 2.5 MPa (25 kg / cm 2 ) using an FT die, and this was further rolled with a pair of metal rolls to adjust the thickness.
  • PTFE sheet (thickness 0.5 mm) was obtained.
  • the obtained PTFE sheet was heated and dried to remove the liquid lubricant.
  • the stretched PTFE sheet was further uniaxially stretched in the longitudinal direction at a stretching linear velocity of 1.5 m / min in a heating furnace maintained at 380 ° C.
  • the draw ratio at this time was 8 times.
  • PTFE paste was formed by uniformly mixing 100 parts by weight of PTFE fine powder (manufactured by Asahi ICI Fluoropolymers, Fullon CD-129E) and 19.7 parts by weight of aliphatic hydrocarbon as a liquid lubricant.
  • the formed PTFE paste was extruded into a sheet shape with a pressure of 2.5 MPa (25 kg / cm 2 ) using an FT die, and this was further rolled with a pair of metal rolls to adjust the thickness.
  • PTFE sheet (thickness 0.5 mm) was obtained.
  • the obtained PTFE sheet was heated and dried to remove the liquid lubricant.
  • the film was uniaxially stretched in the longitudinal direction at a drawing linear velocity of 6 m / min using a heating roll maintained at 150 ° C.
  • the draw ratio at this time was 4 times.
  • the stretched PTFE sheet was further uniaxially stretched in the longitudinal direction at a stretching linear velocity of 1.5 m / min in a heating furnace maintained at 380 ° C.
  • the draw ratio at this time was 8 times.
  • Comparative Example 3 The PTFE porous membrane produced in Comparative Example 2 was subjected to sticking treatment in the same manner as in Example 2 to obtain a PTFE porous membrane of Comparative Example 3.
  • Table 1 shows the evaluation results of the PTFE porous membranes prepared in each Example and Comparative Example.
  • the PTFE porous membrane of the example showed higher moisture permeability in the film thickness direction than the PTFE porous membrane of the comparative example.
  • the PTFE porous membranes of Examples 1 and 3 had their average curvature decreased by the sticking treatment and the moisture permeability in the film thickness direction was improved, but the PTFE porous membrane of Comparative Example 2 was obtained by the sticking treatment. The average curvature and the moisture permeability in the film thickness direction did not change.
  • the PTFE porous membrane of the present invention can be used as a waterproof breathable membrane, for example.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La membrane poreuse en polytétrafluoroéthylène (PTFE) selon la présente divulgation a une perméabilité à l'humidité, mesurée selon les spécifications de JIS L1099 (Méthode B-1), de 150 000 g/(m2·jour) ou plus dans le sens de l'épaisseur de la membrane. Cette membrane poreuse en PTFE peut avoir une longueur de fibrilles moyenne de 50 µm ou plus, une longueur de nœud moyenne qui est au moins cinq fois la longueur de fibrilles moyenne, et une proportion en termes d'espace nœuds moyenne de 5 % ou moins. Quand elle est fixée à titre de membrane respirante étanche à l'eau au boîtier d'un produit électrique, d'un composant électrique, ou autres, la membrane poreuse en PTFE selon la présente divulgation permet à la vapeur d'eau retenue dans le boîtier d'en être évacuée plus rapidement.
PCT/JP2017/027835 2016-12-19 2017-08-01 Membrane poreuse en polytétrafluoroéthylène, membrane respirante étanche à l'eau et élément respirant étanche à l'eau l'utilisant Ceased WO2018116517A1 (fr)

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US11561495B2 (en) 2020-12-25 2023-01-24 Canon Kabushiki Kaisha Pressing rotating member and production method thereof, fixing apparatus, and electrophotographic image forming apparatus
CN115734980A (zh) * 2020-07-03 2023-03-03 日东电工株式会社 聚四氟乙烯多孔膜、通气膜和通气构件
US12059874B2 (en) 2020-12-25 2024-08-13 Canon Kabushiki Kaisha Fixing rotating member, fixing apparatus, electrophotographic image forming apparatus, and method for producing fixing rotating member
US12070925B2 (en) 2020-12-25 2024-08-27 Canon Kabushiki Kaisha Fixing rotating member, fixing apparatus and electrophotographic image forming apparatus, and method for producing fixing rotating member

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US11561495B2 (en) 2020-12-25 2023-01-24 Canon Kabushiki Kaisha Pressing rotating member and production method thereof, fixing apparatus, and electrophotographic image forming apparatus
US12059874B2 (en) 2020-12-25 2024-08-13 Canon Kabushiki Kaisha Fixing rotating member, fixing apparatus, electrophotographic image forming apparatus, and method for producing fixing rotating member
US12070925B2 (en) 2020-12-25 2024-08-27 Canon Kabushiki Kaisha Fixing rotating member, fixing apparatus and electrophotographic image forming apparatus, and method for producing fixing rotating member

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