WO2017135292A1 - 標準ガスバリアフィルム - Google Patents
標準ガスバリアフィルム Download PDFInfo
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- WO2017135292A1 WO2017135292A1 PCT/JP2017/003571 JP2017003571W WO2017135292A1 WO 2017135292 A1 WO2017135292 A1 WO 2017135292A1 JP 2017003571 W JP2017003571 W JP 2017003571W WO 2017135292 A1 WO2017135292 A1 WO 2017135292A1
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- gas barrier
- standard gas
- barrier film
- water vapor
- opening
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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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
- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
Definitions
- the present invention relates to a standard gas barrier film used for calibration and evaluation of a gas permeability measuring device.
- Gas barrier films are used for packaging and sealing foods and electronic parts according to the water vapor and oxygen permeability. For this reason, it is important to accurately measure the water vapor and oxygen permeability of the gas barrier film.
- the measurement of water vapor permeability of gas barrier films can be classified into the isobaric method and the differential pressure method.
- the isobaric method includes cup method, electrode method, calcium method, mocon method, gas chromatograph method, API-MS method, etc.
- Many gas permeability measurement devices require a standard gas barrier film for calibration of device constants, comparison of results between different measurement devices, and assessment of the health of the measurement device.
- a gas barrier film having a water vapor permeability of the order of 10 ⁇ 6 g / m 2 / day is required as a sealing material in order to prevent deterioration.
- the water vapor permeability of 3.2 ⁇ 10 ⁇ 2 g / m 2 / day is the smallest in the US National Institute of Standards and Technology (NIST) traceable standard gas barrier film.
- the standard gas barrier film developed in (1) has the minimum water vapor permeability of 8 ⁇ 10 ⁇ 3 g / m 2 / day (Non-patent Document 1).
- Non-patent document 2 and Non-patent document 3 Non-patent document 3
- these standard gas barrier films cannot be used for calibration and evaluation of an apparatus for measuring the gas permeability of a gas barrier film of the order of 10 ⁇ 6 g / m 2 / day.
- the National Standard Institute of Technology (NIST) traceable standard gas barrier film has a structure in which a plastic film is attached to a metal plate with a hole, and the opening area of the hole is proportional to the water vapor transmission rate. Utilizing this, the water vapor permeability is obtained.
- NIST National Standard Institute of Technology
- the processing accuracy of the drilling process and the measurement accuracy of the shape measurement of the hole are deteriorated, so that the variation in water vapor permeability of the standard gas barrier film is increased.
- the ratio of the film thickness of the plastic film to the hole diameter is increased, a concentration distribution of water vapor is generated in the plastic film surface, and there is a problem that the opening area of the opening of the hole is not proportional to the water vapor transmission amount. For this reason, a highly reliable standard gas barrier film cannot be manufactured.
- a standard gas barrier film in which a plastic film obtained by coating an organic film with an inorganic gas barrier layer in multiple layers is attached to a substrate can be considered.
- this method cannot produce a highly reliable standard gas barrier film.
- the gas barrier property is expressed by the labyrinth effect, so the gas permeability in the gas barrier film varies widely, and the water vapor permeability of the standard gas barrier film depends on which part of the gas barrier film is used to make the standard gas barrier film. Because it will be very different.
- the organic film swells and damages the inorganic gas barrier layer, the reproducibility of the measurement cannot be obtained.
- the present invention has been made in view of such circumstances, and an object thereof is to provide a standard gas barrier film that can be used in an apparatus for measuring the gas permeability of a gas barrier film of the order of 10 ⁇ 6 g / m 2 / day.
- the standard gas barrier film of the present invention is used for calibration of a water vapor transmission rate measuring device, has a base material having an opening, and a barrier layer provided on the base material so as to cover the opening, It contains Li-type montmorillonite nanoparticles and polyimide, and the ratio of the maximum diameter of the opening to the thickness of the barrier layer is 50 to 2000.
- the substrate and the barrier layer are directly bonded.
- the standard gas barrier film of the present invention preferably has a water vapor permeability of 10 ⁇ 6 to 10 ⁇ 3 g / m 2 / day at 40 ° C. and a relative humidity of 90%.
- the base material may be a metal plate having an arithmetic average roughness Ra of 2 nm or less on the surface opposite to the surface on which the barrier layer is provided.
- the number of openings may be 1 to 10, and the maximum diameter of all openings may be 1 to 20 mm.
- the mass of polyimide is preferably 20 to 40% with respect to the sum of the masses of Li-type montmorillonite and polyimide.
- the method for producing a standard gas barrier film of the present invention includes a base material having an opening and a barrier layer provided on the base so as to cover the opening, and is used for calibration of a water vapor transmission rate measuring device.
- a method for producing a film comprising: a step of obtaining a laminated body including a Li-type montmorillonite nanoparticle and a polyamic acid, and a laminated body including a laminated portion of a plastic film; and the laminated body so as to cover the opening And heating to a second temperature at which the polyamic acid is imidized at a temperature equal to or higher than the first temperature.
- the first temperature is preferably 60 to 150 ° C.
- the second temperature is preferably 150 to 350 ° C.
- a standard gas barrier film having a water vapor permeability of 10 ⁇ 6 to 10 ⁇ 3 g / m 2 / day can be obtained.
- FIG. 1 The top view of the standard gas barrier film which concerns on embodiment of this invention. Sectional drawing of the standard gas barrier film which concerns on embodiment of this invention. Sectional drawing for demonstrating the manufacturing method of the standard gas barrier film which concerns on embodiment of this invention.
- the graph which shows the result of having measured the ion current of m / z18 of the standard gas barrier film obtained in Example 1- Example 3.
- FIG. The graph which shows the relationship between the saturated ion current of m / z18 of the standard gas barrier film obtained in Example 1 to Example 3, and the opening area of the opening part of a hole.
- SCE standard conductance element
- FIG. 1 schematically shows the upper surface of a standard gas barrier film 10 according to an embodiment of the present invention.
- FIG. 2 schematically shows a cross section of the standard gas barrier film 10 taken along line AA in FIG.
- the standard gas barrier film 10 is used for calibration of a water vapor transmission rate measuring device.
- the standard gas barrier film 10 includes a substrate 12 and a barrier layer 14.
- the base material 12 is a disc and is made of metal, for example, stainless steel.
- the substrate 12 is a disc, but the shape of the substrate is not particularly limited, and may be a polygonal plate or an elliptical plate.
- the substrate 12 is a metal plate, but the material of the substrate is not particularly limited as long as the portion in contact with the barrier layer 14 and the periphery thereof do not transmit water vapor.
- the base material may be made of ceramic, resin, or the like.
- the base material 12 is provided with a cylindrical opening 12a.
- the opening 12a has a cylindrical shape.
- the shape of the opening 12a is not particularly limited, and may be a polygonal column, an elliptical column, a truncated cone, or the like. Good.
- the maximum diameter of the opening 12a is preferably 1 to 20 mm. This is because the water vapor permeability of the standard gas barrier film 10 can be reduced. Moreover, it is because the precision and tolerance of drilling machining of the opening part 12a which influences water vapor permeability can be made sufficiently small.
- the number of openings 12a is preferably 1 to 10.
- the barrier layer 14 is provided on the base material 12 so as to cover the opening 12a.
- the barrier layer 14 contains Li-type montmorillonite nanoparticles and polyimide.
- Montmorillonite is a kind of clay called smectite. Montmorillonite is a plate-like crystal having a thickness of 1 nm and is used as a functional filler added to plastic. When a small amount of montmorillonite is uniformly added to plastic, gas barrier properties are improved. Montmorillonite purified from natural minerals is widely distributed.
- a film having a high water vapor barrier property can be formed by molding a mixed material containing montmorillonite as a main component and added with a binder (Patent Document 2). A method for producing a film having a high water vapor barrier property will be described below.
- Li-type montmorillonite is prepared.
- Montmorillonite has exchangeable ions, and these exchangeable ions are generally Na and Ca. It is possible to exchange Na and Ca, which are exchangeable ions in montmorillonite, with Li by ion exchange.
- Montmorillonite obtained by exchanging exchangeable ions with Li by ion exchange is Li-type montmorillonite.
- 20 parts by mass of Li-type montmorillonite and, for example, 80 parts by mass of water are mixed to produce a uniform gel (hereinafter sometimes referred to as “Li-type montmorillonite gel”).
- Li-type montmorillonite gel is dispersed in a solvent such as N-methyl-2-pyrrolidone or dimethylacetamide, and further mixed with a solution in which polyamic acid is dissolved in this solvent, and formed into a film on a plastic film.
- a handleable structure can be obtained by drying the solvent. And by peeling a plastic film from this structure and heat-processing the remaining film
- This film is a nanocomposite barrier layer of Li-type montmorillonite and polyimide.
- the mass of polyimide relative to the sum of the masses of Li-type montmorillonite and polyimide is preferably 20 to 40%. This is because the water vapor permeability of the manufactured barrier layer can be in the order of 10 ⁇ 3 g / m 2 / day.
- the surface of the base material 12 is smooth from the two viewpoints of eliminating the gap between the base material 12 and the barrier layer 14 and reducing the outgas from the base material 12 that affects the measurement of water vapor permeability. It is preferable.
- the surface roughness of the surface opposite to the surface on which the barrier layer 14 is provided is large, the amount of water vapor adsorbed on the substrate 12 increases.
- the water vapor adsorbed on the substrate 12 is gradually desorbed during the measurement of the water vapor transmission rate, so that the background of the water vapor measurement increases, and as a result, the water vapor transmission rate measurement of the high barrier film becomes difficult. Therefore, it is preferable that the arithmetic average surface roughness Ra of the surface opposite to the surface provided with the barrier layer is set to 2 nm or less by using electrolytic polishing, chemical polishing, electrolytic composite polishing, or the like.
- the water vapor transmission rate is measured using the surface on which the barrier layer 14 is provided as the water vapor exposure side, the water vapor transmitted through the barrier layer 14 is released from the opening 12a. For this reason, the water vapor concentration inside the barrier layer 14 at the portion in contact with the opening 12 a is lower than the water vapor concentration inside the barrier layer 14 at the portion in contact with the substrate 12.
- in-plane diffusion of water vapor occurs from the portion of the barrier layer 14 in contact with the substrate 12 to the portion of the barrier layer 14 in contact with the opening 12a.
- the water vapor permeability of the standard gas barrier film 10 is not proportional to the opening area of the opening 12a.
- the influence of the in-plane diffusion of water vapor becomes negligible as the ratio of the maximum diameter of the opening 12a to the thickness of the barrier layer 14 increases.
- the ratio of the maximum diameter of the opening 12a to the thickness of the barrier layer 14 is set to 50 to 2000, so that the water vapor permeability is 10 ⁇ 6 to 10 ⁇ 3 g / m 2 / day.
- the gas barrier film 10 is produced.
- the water vapor permeability of the standard gas barrier film 10 can be measured using a water vapor permeability measuring apparatus using either the isobaric method or the differential pressure method.
- the surface on which the barrier layer 14 is provided needs to be on the exposed side (high pressure side). This is because if the opposite side of the surface on which the barrier layer 14 is provided is the exposed side (high pressure side), the barrier layer 14 may be peeled off from the substrate 12.
- FIG. 3 shows a manufacturing process of the standard gas barrier film 10.
- the standard gas barrier film 10 is manufactured by the following procedure. First, as shown in FIG. 3A, a mixed liquid containing Li-type montmorillonite and polyamic acid is applied onto the plastic film 16 and dried at 60 ° C. to form a laminate 18 of the film body 13 and the plastic film 16. obtain. More specifically, after mixing Li-type montmorillonite, polyamic acid, and an organic solvent, an insoluble lump is removed through a sieve to obtain a mixed liquid containing Li-type montmorillonite and polyamic acid.
- plastic film 16 for example, PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), PTFE (polytetrafluoroethylene), and PET (polyethylene terephthalate) can be used.
- PFA tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer
- PTFE polytetrafluoroethylene
- PET polyethylene terephthalate
- the film body 13 may cover the opening part 12a of the base material 12, and a base material 12 and the laminated body 18 are integrated. More specifically, while pressing the laminated body 18 against the base material 12, the temperature is raised from room temperature to a first temperature, for example, 150 ° C. to integrate the base material 12 and the laminated body 18. In addition, after peeling the film body 13 from the plastic film 16, the film body 13 and the film body 13 may be integrated by heating at a first temperature while pressing the film body 13 against the base material 12.
- the maximum diameter of the opening 12a with respect to the thickness of the barrier layer 14 is 50 to 2000. This is because the water vapor permeability of the standard gas barrier film 10 to be obtained is reduced and the water vapor permeability is proportional to the opening area of the opening 12a.
- the plastic film 16 is peeled from the film body 13, and the temperature is raised from room temperature to a second temperature, for example, 350 ° C. to obtain the standard gas barrier film 10.
- the first temperature is preferably 60 to 150 ° C. and the second temperature is preferably 150 to 350 ° C. This is because the barrier layer 14 is securely attached to the substrate 12 and the polyamic acid is imidized.
- the standard gas barrier film thus prepared has a water vapor permeability WS (g / m 2 / day), the water vapor permeability of the barrier layer itself is W B (g / m 2 / day), and the diameter of the circular opening 12a is d.
- W S W B ⁇ (d / D) 2 (Formula 1) It is represented by For example, a W B 2.0 ⁇ 10 -3 (g / m 2 / day), 2mm and d, when the 90mm to D, the water vapor transmission rate W S of the standard gas barrier film 1.0 ⁇ 10 -6 (g / m 2 / day) to become.
- the variation of the opening area of the opening 12a is about 10%. Even if the diameter of the opening 12a is increased to 20 mm, the machining accuracy does not change at ⁇ 0.05 mm. Therefore, when the 20mm diameter of the opening 12a from the 1 mm, can be compared to the film plane and variation of each rod of the water vapor transmission rate W B of the barrier layer, to reduce variations in the area of the opening 12a.
- the standard gas barrier film having the same water vapor permeability W S can be mass-produced at a variation of 15% or less.
- the standard gas barrier film 10 has small individual differences, excellent reproducibility of water vapor permeability measurement, and since the barrier film 14 is a single layer, the behavior of water vapor permeation is simple and can withstand heating at 350 ° C. Since the barrier film 14 can be adhered to the substrate 12 without using an adhesive, the reliability is high.
- the diameter of the opening 12a When the diameter of the opening 12a is smaller than 1 mm, the effect of the hole machining accuracy on the water vapor permeability of the standard gas barrier film increases. For example, when the diameter of the opening 12a is 0.5 mm and the processing accuracy is ⁇ 0.05 mm, the variation in the opening area of the opening 12a is 21%, and the variation in the water vapor transmission rate of the standard gas barrier film becomes large.
- wire electric discharge machining etc. it is possible to make the machining accuracy of the diameter of the opening ⁇ 0.05 mm or less, but from the viewpoint of manufacturing cost, it is possible to use wire electric discharge machining etc. for mass-produced products It is not preferable.
- the diameter of the opening 12a is smaller than 1 mm, it is difficult to measure the inner diameter.
- Example 1 First, 50 g of a uniform gel obtained by mixing 20 parts by mass of Li-type montmorillonite and 80 parts by mass of water (hereinafter sometimes referred to as “Li-type montmorillonite 20% gel”) and N-methyl-2-pyrrolidone 105 g And 29.9 g of an 18% N-methyl-2-pyrrolidone solution of polyamic acid were mixed, and then passed through a sieve having an opening of about 53 ⁇ m. Next, using a casting knife, the obtained mixed solution was applied onto a PET film and then dried at 60 ° C., and composed of a film body containing Li-type montmorillonite and polyamic acid, and a PET film. A laminate was obtained.
- Li-type montmorillonite 20% gel a uniform gel obtained by mixing 20 parts by mass of Li-type montmorillonite and 80 parts by mass of water
- a stainless plate (outer diameter 120 mm, thickness 0.5 mm) having both surfaces electropolished was prepared as a base material.
- This stainless steel plate was provided with a cylindrical hole having a diameter of 20 mm (tolerance ⁇ 0.05 mm) in the center. Further, the electropolishing region was a circle having a diameter of 120 mm.
- the laminate was hot-pressed on the stainless steel plate so that the center of the stainless steel plate and the center of the laminated body were almost aligned with the film body in contact with the electropolishing region. That is, the stainless steel plate and the laminated body were integrated by heating at 150 ° C. which is the first temperature while pressing the laminated body against the stainless steel plate so that the film body covers the opening. At this time, the force applied to the laminate was 5 to 10 N, and the temperature of the stainless steel plate and the laminate was increased from room temperature to 150 ° C. over 1 hour.
- a standard gas barrier film having a disc-shaped barrier layer with a diameter of about 30 mm and a thickness of about 30 ⁇ m in the center, an opening diameter of 20 mm, and a polyimide mass of 35% with respect to the sum of the masses of Li-type montmorillonite and polyimide.
- the water vapor permeability of the barrier layer itself was 2.0 ⁇ 10 ⁇ 3 g / m 2 / day as measured with a water vapor permeability measuring device (Technolox, Delta Palm). Therefore, when measured with a water vapor permeability measuring device having an effective diameter of 90 mm, the water vapor permeability of this standard gas barrier film is 1.0 ⁇ 10 ⁇ 4 g / m 2 / day.
- Example 5 In order to shorten the measurement time of the standard gas barrier film, it is effective to make the barrier layer thin.
- a standard gas barrier film was produced in the same manner as in Example 1 except that the thickness of the barrier layer was about 10 ⁇ m.
- the water vapor permeability of this standard gas barrier film is 3.0 ⁇ 10 ⁇ 4 g / m 2 / day.
- Example 6 when the ratio of the maximum diameter of the opening of the base material to the thickness of the barrier layer is 67 to 2000, and measured with a water vapor permeability measuring device having an effective diameter of 90 mm, the water vapor of the standard gas barrier film A standard gas barrier film having a transmittance of 1.0 ⁇ 10 ⁇ 6 to 3.0 ⁇ 10 ⁇ 4 g / m 2 / day could be produced.
- the effective diameter D of commercially available water vapor permeability measuring devices is often 40 to 120 mm. Without changing the barrier layer itself of the water vapor permeability W B, to prepare a small standard gas barrier film of the water vapor transmission rate W S for small water vapor transmission rate measuring device of the effective diameter D is in the from (Equation 1) It is necessary to reduce the diameter d of the opening of the stainless steel plate.
- FIG. 4 shows the result of measuring the water vapor signal of the standard gas barrier film obtained in Example 1 to Example 3, that is, the ion current of m / z 18 by the method described in Patent Document 1.
- the horizontal axis is the elapsed time from the introduction of water vapor at 40 ° C. and 90% relative humidity to the exposed side of the standard gas barrier film, and the vertical axis is m / z 18 of the quadrupole mass spectrometer. It is a signal of the amount of water vapor permeated through an ion current, that is, a standard gas barrier film.
- This measurement was performed with a water vapor permeability measuring apparatus (Owell Corporation, Omega Trans) having an effective diameter of 90 mm. The background value in the measurement is subtracted.
- the signal of water vapor gradually increased from about 120 hours and showed a saturation tendency at 400 hours.
- the standard gas barrier film obtained in Example 1 had a saturated ion current of 1.5 ⁇ 10 ⁇ 11 A.
- the standard gas barrier film obtained in Example 2 had a saturated ion current of 1.9 ⁇ 10 ⁇ 12 A.
- the saturated ion current of the standard gas barrier film obtained in Example 3 was 3.7 ⁇ 10 ⁇ 13 A.
- FIG. 5 is a diagram in which the saturated ion currents of the standard gas barrier films obtained in Examples 1 to 3 are plotted against the opening area of the opening 12a.
- the saturated ion current of the standard gas barrier film changed in proportion to the opening area of the opening 12a.
- I sat 4.79 ⁇ 10 -8 ⁇ A ( Formula 2) was gotten.
- the difference between the saturated ion current I sat calculated from this (Equation 2) and each measurement point in Example 1 to Example 3 was 25% or less.
- FIG. 6 shows a comparison between the measurement result of FIG. 5 and the calibration result by the method described in Patent Document 1.
- Water vapor exposure conditions for the standard gas barrier film are a temperature of 40 ° C. and a relative humidity of 90%.
- the method described in Patent Document 1 uses a water vapor flow rate introduced through a stainless steel porous sintered body “standard conductance element (SCE)” whose molecular flow conductance is calibrated, and m / m measured by a quadrupole mass spectrometer. This is a method of calibrating by comparing the z18 ion current, that is, the water vapor signal.
- SCE standard conductance element
- the ion current at m / z 18 is plotted against the equivalent water vapor permeability determined from the water vapor flow rate introduced through the SCE and the effective diameter of the apparatus.
- the water vapor flow rate by SCE was adjusted by changing the upstream pressure of SCE.
- the water vapor permeability of the standard gas barrier films obtained in Examples 1 to 3 is located on the straight line of the calibration result obtained by the method described in Patent Document 1. Therefore, it was confirmed that a standard gas barrier film having a water vapor permeability of 10 ⁇ 4 g / m 2 / day or less at a temperature of 40 ° C. and a relative humidity of 90% can be produced.
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Abstract
Description
WS=WB× (d/D)2 (式1)
で表される。例えば、WBを2.0×10-3(g/m2/day)、dを2mm、Dを90mmとすると、標準ガスバリアフィルムの水蒸気透過度WSは1.0×10-6(g/m2/day)となる。
まず、20質量部のLi型モンモリロナイトおよび80質量部の水を混合して得た均一なゲル(以下「Li型モンモリロナイト20%ゲル」ということがある)50gと、N-メチル-2-ピロリドン105gと、ポリアミック酸の18%N-メチル-2-ピロリドン溶液29.9gを混合した後、目開き約53μmのふるいを通過させた。つぎに、キャスティングナイフを用いて、得られた混合液をPET製フィルム上に塗布した後、60℃で乾燥させて、Li型モンモリロナイトとポリアミック酸を含有する膜体と、PET製フィルムとから構成される積層体を得た。一方、両面が電解研磨されているステンレス板(外径120mm、厚さ0.5mm)を基材として用意した。このステンレス板は、中心に直径20mm(公差±0.05mm)の円柱状の穴が設けられていた。また、電解研磨領域は直径120mmの円形であった。
ステンレス板の穴の直径が6.5mm(公差±0.05mm)である点を除いて、実施例1と同様にして標準ガスバリアフィルムを作製した。直径約30mm、厚さ約30μmの円板状のバリア層を中央に備える標準ガスバリアフィルムを得た。バリア層の厚さに対するステンレス板の開口部の最大径の比は、6.5mm/30μm=217であった。有効径90mmの水蒸気透過度測定装置で測定した場合、この標準ガスバリアフィルムの水蒸気透過度は、1.1×10-5g/m2/dayとなる。
ステンレス板の穴の直径が3.5mm(公差±0.05mm)である点を除いて、実施例1と同様にして標準ガスバリアフィルムを作製した。直径約30mm、厚さ約30μmの円板状のバリア層を中央に備える標準ガスバリアフィルムを得た。バリア層の厚さに対する開口部の最大径の比は、3.5mm/30μm=117であった。有効径90mmの水蒸気透過度測定装置で測定した場合、この標準ガスバリアフィルムの水蒸気透過度は、3.1×10-6g/m2/dayとなる。
ステンレス板の穴の直径が2.0mm(公差±0.05mm)である点を除いて、実施例1と同様にして標準ガスバリアフィルムを作製した。直径約30mm、厚さ約30μmの円板状のバリア層を中央に備える標準ガスバリアフィルムを得た。バリア層の厚さに対する開口部の最大径の比は、2.0mm/30μm=67であった。有効径90mmの水蒸気透過度測定装置で測定した場合、この標準ガスバリアフィルムの水蒸気透過度は、1.0×10-6g/m2/dayとなる。
標準ガスバリアフィルムの測定時間を短縮するためには、バリア層を薄くすることが有効である。バリア層の厚さが約10μmである点を除いて、実施例1と同様にして標準ガスバリアフィルムを作製した。バリア層の厚さに対するステンレス板の開口部の最大径の比は、20mm/10μm=2000であった。有効径90mmの水蒸気透過度測定装置で測定した場合、この標準ガスバリアフィルムの水蒸気透過度は、3.0×10-4g/m2/dayとなる。
ステンレス板の穴の直径が1.2mm(公差±0.05mm)である点を除いて、実施例4と同様にして標準ガスバリアフィルムを作製した。バリア層の厚さに対するステンレス板の開口部の最大径の比は、1.2mm/10μm=120であった。有効径90mmの水蒸気透過度測定装置で測定した場合、この標準ガスバリアフィルムの水蒸気透過度は、1.1×10-6g/m2/dayとなる。
図4は、実施例1から実施例3で得られた標準ガスバリアフィルムの水蒸気の信号、すなわちm/z18のイオン電流を特許文献1記載の方法で測定した結果を示している。図4では、横軸が、40℃で相対湿度90%の水蒸気を標準ガスバリアフィルムの暴露側に導入した時からの経過時間であり、縦軸が、四極子形質量分析計のm/z18のイオン電流、すなわち標準ガスバリアフィルムを透過した水蒸気透過量の信号である。この測定は、有効径90mmの水蒸気透過度測定装置(オーウエル株式会社、オメガトランス)で行った。なお、測定におけるバックグラウンドの値は差し引いてある。
Isat=4.79×10-8×A (式2)
が得られた。この(式2)から計算される飽和イオン電流Isatと、実施例1から実施例3の各測定点の差は、25%以下であった。
12…基材
12a…開口部
13…膜体
14…バリア層
16…プラスチックフィルム
18…積層体
Claims (8)
- 水蒸気透過度測定装置の校正に用いる標準ガスバリアフィルムであって、
開口部を備える基材と、
前記開口部を覆うように前記基材上に設けられたバリア層と、
を有し、
前記バリア層が、Li型モンモリロナイトのナノ粒子と、ポリイミドとを含有し、
前記バリア層の厚さに対する前記開口部の最大径の比が50~2000である標準ガスバリアフィルム。 - 前記基材と前記バリア層が直接接合されている請求項1に記載の標準ガスバリアフィルム。
- 40℃で相対湿度90%における水蒸気透過度が10-6~10-3g/m2/dayである請求項1または2に記載の標準ガスバリアフィルム。
- 前記基材は、前記バリア層が設けられた面と反対側の面の算術平均粗さRaが2nm以下の金属板である請求項1から3のいずれかに記載の標準ガスバリアフィルム。
- 前記開口部の数が1~10個で、全ての前記開口部の最大径が1~20mmである請求項1から4のいずれかに記載の標準ガスバリアフィルム。
- 前記Li型モンモリロナイトと前記ポリイミドの質量の和に対する前記ポリイミドの質量が20~40%である請求項1から5のいずれかに記載の標準ガスバリアフィルム。
- 開口部を備える基材と、前記開口部を覆うように前記基材上に設けられたバリア層とを有し、水蒸気透過度測定装置の校正に用いる標準ガスバリアフィルムの製造方法であって、
Li型モンモリロナイトのナノ粒子およびポリアミック酸を含有する膜体と、プラスチックフィルムの積層部を含む積層体を得る工程と、
前記膜体が前記開口部を覆うように、前記積層体を前記基材に押圧しながら第一温度で加熱し、その後、前記第一温度以上で、前記ポリアミック酸がイミド化する第二温度で加熱する工程と、
を有する標準ガスバリアフィルムの製造方法。 - 前記第一温度が60~150℃で、前記第二温度が150~350℃である請求項7に記載の標準ガスバリアフィルムの製造方法。
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| JP2021018164A (ja) * | 2019-07-22 | 2021-02-15 | 株式会社住化分析センター | ガス透過セル、ガス透過度測定方法、及びガス透過度測定装置 |
| JPWO2021199560A1 (ja) * | 2020-03-31 | 2021-10-07 | ||
| WO2022075030A1 (ja) * | 2020-10-08 | 2022-04-14 | Dic株式会社 | 樹脂組成物、成形体、積層体、ガスバリア材、コーティング材及び接着剤 |
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