WO2016132809A1 - 微多孔プラスチックフィルムの製造方法 - Google Patents
微多孔プラスチックフィルムの製造方法 Download PDFInfo
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- WO2016132809A1 WO2016132809A1 PCT/JP2016/051779 JP2016051779W WO2016132809A1 WO 2016132809 A1 WO2016132809 A1 WO 2016132809A1 JP 2016051779 W JP2016051779 W JP 2016051779W WO 2016132809 A1 WO2016132809 A1 WO 2016132809A1
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- sheet
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- stretching
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- diluent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/18—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets by squeezing between surfaces, e.g. rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
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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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/20—Edge clamps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
- B29K2105/041—Microporous
Definitions
- the present invention relates to a method for producing a microporous plastic film.
- Microporous plastic films are widely used as separators for electrochemical elements such as separation membranes used for separation and selective permeation of substances, alkaline secondary batteries, lithium secondary batteries, fuel cells and capacitors. In particular, it is suitably used as a lithium ion battery separator.
- Patent Document 1 As a method for producing a microporous film using a plastic material mainly including a polyolefin resin as a raw material, there are wet methods as shown in Patent Document 1 and Patent Document 2, for example.
- a diluent such as liquid paraffin is added to the polymer, kneaded and dispersed, discharged onto a cooling drum from the die, and formed into a gel sheet by cooling and solidifying, and then the roller method for the purpose of improving the strength.
- the film is stretched uniaxially or biaxially using a tenter method, and then the diluent is extracted to obtain a microporous film.
- the longitudinal stretch ratio can be freely changed by changing the roller speed. Since it can be stretched, the mechanical properties of the microporous plastic film can be improved.
- the diluent should bleed out from the gel sheet surface with pressure due to heat and tension, and this diluent should be transported and stretched while interposing at the boundary between the film and the roller.
- Patent Document 1 In order to stretch this gel sheet, the sheet that has been sufficiently cooled to below the crystallization end temperature of the polymer is heated and stretched to the extent that it does not exceed the melting point again (for example, above the crystal dispersion temperature as in Patent Document 2). I do.
- Patent Document 1 it is possible to avoid the slip by applying a tension exceeding the longitudinal stretching tension between the longitudinal stretching machine and the lateral stretching machine (tenter), and particularly when a tension of 20% or more of the stretching tension is applied. It is good. According to the knowledge of the present inventor, when a tension exceeding the stretching tension is applied, the sheet is pulled downstream on the side of the transverse stretching machine, conversely promoting slipping, and slipping cannot be prevented.
- An object of the present invention is to provide a method for producing a microporous plastic film having excellent physical properties and mechanical properties by stretching while preventing slipping at high speed and high productivity.
- the method for producing a microporous plastic film of the present invention that solves the above-mentioned problems is that a diluent and a polyolefin resin are kneaded by an extruder, and the resin kneaded with the diluent is discharged from the die into a sheet, and discharged from the die.
- the solidified sheet was cooled and solidified on one or more cooling drums, and then the solidified sheet was heated again and stretched in the sheet transport direction by a plurality of rollers, and stretched in the sheet transport direction.
- At least of a plurality of rollers One or more rollers are equipped with a nip roller that narrows the sheet between them, and this nip roller is driven by a motor. It is driven.
- the method for producing a microporous plastic film of the present invention is a process of heating a sheet with a plurality of rollers upstream of the process of stretching the sheet in the sheet transport direction with a plurality of rollers. It is preferable that at least one of the rollers is provided with a nip roller that narrows the sheet between the rollers, and the nip roller is driven by a motor.
- a microporous plastic film having excellent physical properties and mechanical properties can be obtained with high productivity by preventing slippage even in the wet roller stretching method.
- FIG. 1 It is a schematic side view of the manufacturing process of the microporous plastic film of this invention. It is a schematic front view which concerns on one Embodiment of the drive method of the nip roller in the manufacturing method of the microporous plastic film of this invention. It is a schematic sectional drawing which concerns on one Embodiment of the driving method of the nip roller in the manufacturing method of the microporous plastic film of this invention shown in FIG.
- FIG. 1 is a schematic side view according to a manufacturing process of a microporous plastic film which is an embodiment of the present invention.
- a polyolefin resin solution in which a polyolefin resin is mixed with a diluent and heated and melted is prepared.
- the diluent determines the structure for microporous formation of the microporous plastic film, and also improves the stretchability when stretching the film (for example, reduction of plaque at the stretch ratio for strength development). Contribute.
- the diluent is not particularly limited as long as it is a substance that can be mixed or dissolved in the polyolefin resin. In the melt-kneaded state, it is mixed with the polyolefin resin, but at room temperature, a solid solvent may be mixed with the diluent. Examples of such a solid diluent include stearyl alcohol, seryl alcohol, and paraffin wax.
- the diluent is preferably a liquid at room temperature in order to prevent unevenness due to stretching and to be applied later.
- Liquid diluents include aliphatics such as nonane, decane, decalin, paraxylene, undecane, dodecane, liquid paraffin; cycloaliphatic or aromatic hydrocarbons; and mineral oils with boiling points in the range of these compounds Distillates; and liquid phthalates such as dibutyl phthalate and dioctyl phthalate at room temperature.
- a non-volatile diluent such as liquid paraffin is more preferable.
- the viscosity of the liquid diluent is preferably 20 to 200 cSt at 40 ° C.
- the blending ratio of the polyolefin resin and the diluent is preferably 10 to 50% by mass from the viewpoint of improving the extrudate moldability by setting the total of the polyolefin resin and the diluent to 100% by mass.
- the extruder 21 with a screw like FIG. 1 etc. can be used.
- the preferred range of the temperature of the polyolefin resin solution in the extruder 21 varies depending on the resin.
- the temperature is 140 to 250 ° C. for a polyethylene composition and 190 to 270 ° C. when polypropylene is included.
- the temperature is indirectly grasped by installing a thermometer in the extruder 21 or in the cylinder part, and the heater temperature, the rotation speed, and the discharge amount of the cylinder part are appropriately adjusted so as to reach the target temperature.
- the polyolefin resin solution melt-kneaded by the extruder 21 is discharged in a sheet form from the slit portion of the base 23 while being measured by the gear pump 22 as necessary.
- the discharged gel sheet 12 contacts the cooling drum 31 and solidifies.
- the polyolefin resin portion forms a crystal structure, and this structure becomes a column portion that supports the holes of the microporous plastic film 11 later.
- the gel sheet 12 contains the diluent kneaded in the extruder 21 and is in a gel state.
- a part of the diluent is bleed out from the surface of the sheet by cooling the gel-like sheet 12, so that the surface is conveyed on the cooling drum 31 while the surface is wet by the diluent.
- the thickness of the gel-like sheet 12 is preferably adjusted by adjusting the speed of the cooling drum with respect to the flow rate from the mouthpiece slit portion corresponding to the discharge amount.
- the temperature of the cooling drum 31 affects the crystal structure of the gel sheet 12, and is preferably 15 to 40 ° C. This is because the final cooling temperature of the gel sheet 12 is preferably set to be equal to or lower than the crystallization end temperature. Since the higher-order structure is fine, the molecular orientation easily proceeds in the subsequent stretching.
- the cooling time can be supplemented by appropriately increasing the diameter of the cooling drum 31, adding another cooling drum 32 in addition to the cooling drum 31, or adding a plurality of cooling drums. At this time, in order to densify and homogenize the crystal structure in the gel-like sheet 12, it is preferable to determine the conveying speed, the drum temperature, the drum size, and the number of drums in consideration of the cooling speed.
- the speed of the drum 31 may be set as low as 20 ° C. when the speed is high and the heat conduction time is insufficient. However, if it is lower than 25 ° C., condensation tends to occur. Therefore, air conditioning is preferably performed to reduce the humidity.
- the shape of the cooling drum 31 may be a roller shape or a belt shape.
- the material of the surface should be excellent in shape stability so that the roller speed is constant and easy to obtain processing accuracy.For example, metal, ceramic, fiber composite material, etc. can be considered, but especially the surface is used for heat conduction to the film. A superior metal is preferred.
- non-adhesive coating or rubber coating may be performed to such an extent that thermal conduction is not hindered. Since the sheet and the roller surface are in a wet state due to the bleeding out of the diluent, a metal or metal plating which does not swell due to this and is excellent in scratch resistance and heat conduction is preferable.
- the roughness of the roller surface is preferably about 0.2 to 40 ⁇ m at the maximum height, about 0.2 to 0.8 ⁇ m for a mirror surface and about 20 to 40 ⁇ m for a sufficiently rough surface. Become.
- the mirror surface Since the roller is wet with a diluent, the mirror surface has a low friction coefficient due to lubrication.
- the rough surface has an effect of reducing the amount of lubrication or preventing lubrication by discharging the diluent from the unevenness, and increases the coefficient of friction.
- Mirror surface and rough surface may be combined if necessary, but basically the mirror surface improves maintenance and speed control accuracy such as cleaning, and there is a certain amount of lubricant lubrication on the mirror surface. This is preferable in order to prevent appearance irregularity of the sheet.
- the roller internal structure of the cooling drums 31 and 32 is preferably configured so as to incorporate a heat pump and various cooling devices that have been conventionally used, in addition to providing a refrigerant flow path in order to control the surface temperature.
- the rollers are rotationally driven at a speed set by a rotational driving means such as a motor, and a transmission mechanism is appropriately provided between the rollers so that draw tension and relaxation can be applied according to the expansion and contraction of the sheet.
- a motor may be individually disposed on each roller, and the speed may be adjusted with accuracy by an inverter or a servo to provide the same function as the speed change mechanism.
- the gel-like sheet 12 is in contact with the first cooling drum 31 that is the cooling drum that the upper surface side is discharged from the base 23 and first contacts, and is rapidly cooled by the refrigerant at the above temperature.
- the surface opposite to the surface in contact with the first cooling drum 31 is gradually cooled by air in FIG.
- the cooling rate can be increased also for the opposite surface by cooling with forced convection by an air nozzle or an air chamber. it can. This is particularly suitable when the conveyance speed is high, or when the thickness of the gel sheet is large and the heat conduction from the cooling drum 31 is not sufficient. Further, it is possible to improve the cooling capacity of the opposite surface by disposing a refrigerant nip roller that allows the refrigerant to flow inside on the side opposite to the cooling drum 31.
- the wet gel-like sheet 12 may be pressed against the drum 21 by using a close contact means such as a nip roller, a jet nozzle, a suction chamber, or electrostatic application so that the cooling efficiency is not lowered or meandering due to lubrication. .
- close contact means are preferable because the cooling efficiency of the gel-like sheet 12 is improved in addition to the improvement of traveling performance, and the above cooling rate and final cooling temperature setting are facilitated.
- the both ends of the sheet 13 are gripped with a clip or the like that has been conventionally used, as appropriate, While heating and keeping the temperature in the oven 5, the sheet is stretched in the width direction (a direction perpendicular to the transport direction) while transporting the sheet in the traveling direction.
- the sheet conveying direction stretching (hereinafter referred to as longitudinal stretching) step is composed of a roller having a surface of metal or the like and a temperature control mechanism such as a heater inside the same as the cooling drum, and the driving is the same. is there.
- pass you may arrange
- the idler roller since the coefficient of friction between the wet film and the roller is small, it is preferable that the idler roller has a small bearing and inertia loss so that the rotational force is small, and it is also preferable not to provide more than necessary.
- the internal structures of the temperature raising roller group 41 and the drawing roller group 42 are also preferably heated by providing a flow path of a heat medium such as steam or pressurized hot water inside the rollers, similarly to the cooling drum 31.
- a heat medium such as steam or pressurized hot water inside the rollers
- the roller is supported by a bearing so that it can be rotated, and in order to supply a heat medium inside, a rotatable joint (generally called a rotary joint) for supplying a heat medium that does not disturb the rotation of the roller is used as a shaft. It may be connected to the end and connected to the heat medium supply pipe.
- the stretching ratio varies depending on the thickness of the gel sheet, but the stretching in the sheet conveying direction is preferably performed at 5 to 12 times.
- the area magnification is preferably 30 times or more, more preferably 40 times or more, and still more preferably 60 times or more.
- the stretching temperature is preferably below the melting point of the polyolefin resin, and more preferably in the range of (polyolefin resin crystal dispersion temperature Tcd) to (polyolefin resin melting point).
- Tcd polyolefin resin crystal dispersion temperature
- the temperature is from 80 to 130 ° C, more preferably from 100 to 125 ° C. After stretching, cooling is performed below these temperatures.
- the uniaxially stretched sheet 13 or the biaxially stretched sheet 14 thus obtained is washed and removed with a conventional technique, for example, a method described in International Publication No. 2008-016174, and dried.
- a dried microporous plastic film 11 can be obtained.
- the microporous plastic film 11 When the microporous plastic film 11 is obtained, it may be re-heated and re-stretched in the dry stretching step 7 after the washing step 6.
- the redrawing step 7 may be either a roller type or a tenter type, and physical properties can be adjusted and residual strain can be removed by performing a heat treatment in the same step. Further, depending on the application, the surface of the microporous plastic film 11 may be subjected to surface treatment such as corona discharge or functional coating such as heat-resistant particles.
- the diluent contained in the gel-like sheet 12 bleeds out by being cooled by the cooling drums 31 and 32. Further, the diluent bleeds out even under the pressure due to the conveying tension here. For the same reason, after discharging from the base 23, the surfaces of the gel-like sheet 12 and the stretched films 13 and 14 are wet with the diluent until the diluent is removed and washed in the washing step 6.
- the gel-like sheet 12 is heated to the stretching temperature, for example, by the temperature raising roller group 41 in the longitudinal stretching step 4, and the bleeding out of the diluent is accelerated by the temperature rising.
- Bleed-out is particularly increased from the first cooling drum 31 to the upstream of the longitudinal stretching step 4, that is, from the temperature raising roller group 41.
- a pan (not shown) may be installed to collect and discard or reuse the diluent.
- the temperature raising roller group 41 and the stretching roller group 42 are common in that the temperature of the gel sheet 12 is raised and heated and the roller rotation speed can be made variable.
- the stretching roller 42 is a roller for substantially stretching the gel-like sheet 12, it is a roller for providing a peripheral speed difference for causing the gel-like sheet 12 to be permanently deformed in the traveling direction. More specifically, a roller that gives a difference in peripheral speed of 3% or more with respect to an upstream roller is defined as a roller that substantially extends, that is, a stretching roller 42.
- the gel sheet 12 is narrowly pressed between the stretching roller group 42 and the nip roller 44 with at least one to obtain a frictional force so as to balance the stretching tension.
- a nip roller 44 is also disposed on the stretching roller group 41 and the cooling drums 31 and 32 as appropriate.
- a flexible rubber-like elastic body is used so that the gel-like sheet 12 can be uniformly pressed against uneven thickness of the gel-like sheet 12, deflection of the roller, and slight irregularities on the surface.
- the flexible rubber-like elastic body is not particularly limited, but a general vulcanized rubber such as nitrile butyl rubber (NBR), chloroprene rubber (CR), ethylene propylene rubber (EPDM), hyperon rubber (CSM) and the like are suitable. is there.
- NBR nitrile butyl rubber
- CR chloroprene rubber
- EPDM ethylene propylene rubber
- CSM hyperon rubber
- the gel-like sheet 12 and the conveying roller temperature are high, specifically, when the temperature is 80 ° C. or higher, the EPDM and CSM are particularly preferable.
- silicone rubber and fluororubber are suitable in addition to the vulcanized rubber.
- a gripping force (frictional force) is required between the roller and the gel-like sheet 12, and in particular, the stretching roller group 42 has a high tension due to stretching.
- a high gripping force that is balanced with the stretching tension is required. Since the diluent bleed out as described above is interposed between the roller and the gel-like sheet 12 and is in a lubricated state, it causes a reduction in gripping force necessary for conveyance and stretching.
- the diluent is interposed not only between the stretching roller and the sheet but also between the nip roller 44 and the gel sheet 12.
- the frictional force necessary for stretching is obtained by friction between the stretching roller 42 or the nip roller 44 and the gel-like sheet 12. It has been found that when the nip roller does not rotate by lubrication with the diluent between the sheets 12, the straightness of the gel-like sheet 12 is hindered and causes meandering.
- the method for producing a microporous plastic film according to the present invention includes at least one of the plurality of rollers of the stretching roller group 42 and a nip roller 44 that narrows the sheet between the rollers.
- This nip roller is driven by a motor.
- seat 12 can be prevented, without a nip roller idling.
- the diluent is interposed, when the nip roller is idled and the nip roller and the sheet are slightly in direct contact with each other, the surface of the nip roller and the gel-like sheet 12 are also promoted. Generation of these abrasion powders can be suppressed by driving.
- all rollers in the stretching roller group 42 are provided with nip rollers, and all these nip rollers are driven by a motor.
- each nip roller to be driven and the stretching roller or cooling drum on which the nip roller is disposed have the same rotational speed from the viewpoint of reducing slipping and meandering.
- “same rotational speed” means that the difference between the rotational speeds of the two is within a range of ⁇ 3%.
- At least one of the plurality of temperature raising rollers 41 is also provided with a nip roller 44 that narrows the sheet between the rollers, and the nip roller 44 is preferably driven by a motor.
- the same effect can be obtained. More preferably, all of the temperature raising rollers 41 are provided with nip rollers 44, and all the nip rollers 44 are driven by a motor.
- the driving of the nip roller 44 is not particularly limited.
- the stretching roller 42 is driven by a motor, the driving force is transmitted by using the belt B and pulleys P1, P2, and P3. You may do it.
- the pulley P1 is attached to the shaft end of the stretching roller 44
- the pulley P2 is attached to the shaft end of the nip roller 44. Since the nip roller 44 and the stretching roller 42 need to rotate in the same direction at the contact point, the drive belt B needs to be brought into contact with the pulley P1 and the pulley P2 in the form as shown in FIG. For this reason, the auxiliary pulley P3 can be disposed and driven so that the nip roller 44 and the stretching roller 42 rotate in the same direction at the contact portion.
- the nip roller 44 may be driven by attaching a gear to the stretching roller or nip roller, or non-contact driving using magnetic force may be used when dust on the belt or gear is disliked.
- the nip roller 44 is preferably driven directly by a motor.
- the belt B and the driving device described above it is necessary to arrange the belt B and the driving device described above so as not to impede the pressing. It is. For example, in FIG. 3, the nip roller 44 is pressed toward the stretching roller 42, but the drive belt B is attached in a direction that does not impede this.
- the nip roller When the gel sheet 12 is introduced into the temperature raising roller 41 or the stretching roller 42, the nip roller nips substantially tangentially to improve the thickness spot quality and appearance quality in the longitudinal stretching, Meandering can be prevented. This is because in a state where the nip rollers are not arranged tangentially, a diluent or air accompanies the gel-like sheet 12 with a certain thickness between the stretching roller 42 or the temperature raising roller 41 and then nips by the nip roller 44. This is because there is a bank.
- the nip roller By disposing the nip roller substantially tangentially, the thickness of the diluent and air is suppressed by the nip roller 44 before the sheet is brought into contact with the stretching roller 42 and the temperature raising roller 41, so that the bank is the gel-like sheet 12. A stretched sheet with higher quality cannot be obtained between the roller and the roller.
- tangentially nipping means that the nip roller is nipped at a position where the gel-like sheet 12 starts to contact the heating roller 41 or the stretching roller 41. When the nip roller is nipped at this position, the gel-like sheet 12 becomes like a tangent line of the nip roller. Further, “substantially tangentially nip” means that it is slightly shifted from the position where contact begins, as long as the purpose of niping so as not to be banked is achieved, even if it is not the position where contact begins strictly. Even so, it means the original “tangentially nip”.
- a polyethylene (PE) composition comprising 40% by mass of ultrahigh molecular weight polyethylene having a weight average molecular weight (Mw) of 2.5 ⁇ 10 6 and 60% by mass of high density polyethylene (HDPE) having an Mw of 2.8 ⁇ 10 5
- Mw weight average molecular weight
- HDPE high density polyethylene
- the obtained mixture was charged into the twin-screw extruder 21 at a flow rate of 97 kg / hr using a film forming method as shown in FIG. 1, and liquid paraffin as a diluent was charged at a flow rate of 388 kg / hr, and 210 ° C. Mix at the temperature of
- the obtained polyethylene solution was supplied to the base 23 while being measured with a gear pump, and the polyethylene solution having a temperature of 210 ° C. was discharged onto the first cooling drum 31 whose temperature was controlled to 35 ° C. to form the gel sheet 12. .
- the first cooling drum 31 was rotationally driven at a speed of 10 m / min.
- the thickness of the obtained gel-like sheet 12 was 100 mm square before being introduced into the longitudinal stretching step 4 and measured with a contact-type thickness meter. As a result, the average of 10 times was 1.5 mm. A bleed-out diluent adheres to the surface, and the thickness measurement has a variation of ⁇ 0.1 mm at the maximum.
- the obtained gel-like sheet 12 was heated with the temperature rising roller group 41 and the metal water-feeding roller of the first stretching roller so that the temperature of the sheet surface was 110 ° C.
- the number of rotations of the motor directly connected to the roller was controlled so as to increase in the downstream with a speed difference of 1% according to the thermal expansion of the sheet.
- the stretching roller group 42 is composed of two rollers as shown in FIG. 1, and a nip roller 44 whose surface is coated with fluoro rubber is disposed on each roller, and longitudinal stretching is performed by a speed difference between the rollers. Moreover, each nip roller was driven by the drive mechanism shown in FIG. 2, and the rotation speed was substantially the same as the rotation speed of each drawing roller in contact with the film (the nip roller was 2% faster).
- the speed of the first cooling drum 31 is 10 m / min
- the speed ratio between the temperature raising roller group 41 and the upstream stretching roller 421 is 1% each
- the speed of the upstream stretching roller 421 is 10.4 m / min
- the stretched film 13 was cooled by four rollers of the cooling unit 43 including the last roller 422 of the stretching roller group 42, and the water passing roller temperature was adjusted so that the sheet temperature became 50 ° C.
- the last stretching roller, the cooling roller group 43, and the clips in the transverse stretching process were set to the same speed with a speed difference of 0.
- the surfaces of all the rollers in the longitudinal stretching step 4 are coated with hard chrome plating on the surface of the steel roller, and the surface roughness is 0.4 ⁇ m (0.4S) at the maximum height. used.
- Methylene chloride obtained by holding both ends of the obtained stretched film 13 with clips, transversely stretching in the oven 5 at a magnification of 7 times, at a temperature of 115 ° C., and cooled to 30 ° C., and adjusting the temperature to 25 ° C.
- liquid paraffin was removed.
- the washed film is dried in a drying furnace adjusted to 60 ° C., and is re-stretched in the re-stretching step 7 so that the area magnification is 1.2 times in the longitudinal direction ⁇ lateral direction, and 125 ° C. at a speed of 88.2 m / min.
- Example 1 For 20 seconds to obtain a microporous plastic film 11 having a thickness of 16 ⁇ m and a width of 2000 mm.
- a microporous plastic film was produced using the same apparatus and conditions as in Example 1 except that the nip roller 44 was not driven. [Sliding on stretching roller]
- the amount of meandering in the longitudinal stretching step 4 was evaluated according to the following criteria.
- X impossible: The amount of meandering is 10 mm or more.
- ⁇ possible: The meandering amount is 5 mm or more and less than 10 mm.
- ⁇ Good: The amount of meandering is less than 5 mm.
- the Gurley air resistance was measured according to JIS P8117 using an Oken type air resistance meter (EGO-1T, manufactured by Asahi Seiko Co., Ltd.).
- the maximum load was measured when a microporous film having a film thickness T1 ( ⁇ m) was pierced at a speed of 2 mm / sec with a needle having a spherical surface (curvature radius R: 0.5 mm) and a diameter of 1 mm.
- Example 1 When Example 1 is compared with Comparative Example 1, in Example 1, since the nip roller provided in each stretching roller was driven at the same rotational speed as the stretching roll, it was possible to stably perform stretching while suppressing slippage and meandering. did it. On the other hand, since the nip roller was not driven in Comparative Example 1, slipping and meandering could not be prevented. In particular, the film formation could not be continued due to the large meandering, and the microporous plastic film could not be collected.
- a microporous plastic film excellent in strength and physical properties while maintaining running stability under the necessary stretching conditions when performing stretching necessary to obtain various properties of the microporous film. Can be obtained.
- the present invention is not particularly limited, but can be used for microporous plastic films used for separators of electrochemical reactors such as secondary batteries, fuel cells, capacitors, etc., and functions such as filtration membranes, printed membranes and various clothing materials It can be applied to sex web.
- Microporous plastic film 12 Gel-like sheet (film) 13 Uniaxially stretched sheet (film) 14 Biaxially stretched sheet (film) 15 Microporous Plastic Film Roll 21 Extruder 22 Gear Pump 23 Base 31 First Cooling Drum 32 Second Cooling Drum 33 Refrigerant Nip Roller 4 Longitudinal Stretching Step 41 Heating Roller Group 42 Stretching Roller Group 421 First Longitudinal Stretching Roller 422 Second Longitudinal stretching roller 43 Cooling roller group 44 Nip roller 5 Lateral stretching process 6 Cleaning / drying process 61 Cleaning solvent 7 Re-stretching heat treatment process 8 Winding process P1 Pulling roller with stretching roller P2 Pulley for driving nip roller P3 Auxiliary pulley C Pressing cylinder F Machine Base frame B1 Stretch roller bearing B2 Nip roller bearing and cylinder rod joint B Drive belt M Motor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Cell Separators (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
図1は、本発明の一実施形態である微多孔プラスチックフィルムの製造工程に係る概略側面図である。
ゲル状シート12の厚みは、吐出量に応じた口金スリット部からの流速に対し、冷却ドラムの速度を調整することで調整するのが好ましい。
[実施例1]
[比較例1]
ニップローラー44を駆動させない以外は、実施例1と同様の装置、条件で微多孔プラスチックフィルムを製造した。
[延伸ローラー上での滑り]
×(不可):ローラーとシートの速度差が、ローラー回転速度に対して10%以上
△(可):ローラーとシートの速度差が、ローラー回転速度に対して5%以上10%未満
○(良好):ローラーとシートの速度差が、ローラー回転速度に対して5%未満。
[縦延伸工程の蛇行量]
縦延伸工程4における蛇行量を以下の基準で評価した。
×(不可):蛇行量が10mm以上。
△(可):蛇行量が5mm以上10mm未満。
○(良好):蛇行量が5mm未満。
[微多孔プラスチックフィルム物性および機械的性質]
ガーレー透気抵抗度は、王研式透気抵抗度計(旭精工株式会社製、EGO-1T)を使用して、JIS P8117に準拠して測定した。
○(良好):ガーレー透気抵抗度が160sec±20sec及び突刺強度5N以上
×(不可):上記範囲外
12 ゲル状シート(フィルム)
13 一軸延伸シート(フィルム)
14 二軸延伸シート(フィルム)
15 微多孔プラスチックフィルムロール
21 押出機
22 ギアポンプ
23 口金
31 第1冷却ドラム
32 第2冷却ドラム
33 通冷媒ニップローラー
4 縦延伸工程
41 昇温ローラー群
42 延伸ローラー群
421 第1縦延伸ローラー
422 第2縦延伸ローラー
43 冷却ローラー群
44 ニップローラー
5 横延伸工程
6 洗浄・乾燥工程
61 洗浄溶剤
7 再延伸熱処理工程
8 巻取工程
P1 延伸ローラー付設プーリー
P2 ニップローラー駆動用プーリー
P3 補助プーリー
C 押圧シリンダ
F 機台フレーム
B1 延伸ローラー用軸受
B2 ニップローラー用軸受兼シリンダロッド結合部
B 駆動ベルト
M モーター
Claims (5)
- 希釈剤とポリオレフィン樹脂を押出機にて混練し、前記希釈剤が混練された樹脂を口金からシート状に吐出し、前記口金から吐出されたシートを1つまたは複数の冷却ドラム上で冷却して固化した後、前記固化したシートを再び加熱して、複数のローラーにより前記シートの搬送方向に延伸し、前記シートの搬送方向に延伸した前記シートを冷却した後に前記シート両端をクリップにて把持してテンターに導入し、その後、前記希釈剤を洗浄する1軸または2軸延伸微多孔プラスチックフィルムの製造方法において、
前記複数のローラーのうちの少なくとも1本以上のローラーに、前記ローラーとの間で前記シートを狭圧するニップローラーを備え、前記ニップローラーをモーターにより駆動させることを特徴とする、微多孔プラスチックフィルムの製造方法。 - 前記複数のローラーによりシートの搬送方向に延伸する工程より搬送方向上流で、シートを複数のローラーにより加熱する工程で、これら複数の加熱するローラーのうちの少なくとも1本以上のローラーに、このローラーとの間でシートを狭圧するニップローラーを備え、このニップローラーをモーターにより駆動させる、請求項1に記載の微多孔プラスチックフィルムの製造方法。
- 請求項1または2に記載の微多孔プラスチックフィルムの製造方法で製造した微多孔プラスチックフィルム。
- 請求項3に記載の微多孔プラスチックフィルムを用いた電池用セパレータ。
- 請求項4に記載の電池用セパレータを用いた電池。
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JP2017500563A JP6757520B2 (ja) | 2015-02-20 | 2016-01-22 | 微多孔プラスチックフィルムの製造方法 |
CN201680011131.7A CN107249851A (zh) | 2015-02-20 | 2016-01-22 | 微多孔塑料膜的制造方法 |
KR1020177022884A KR20170117428A (ko) | 2015-02-20 | 2016-01-22 | 미다공 플라스틱 필름의 제조 방법 |
US15/551,611 US20180043598A1 (en) | 2015-02-20 | 2016-01-22 | Method of producing microporous plastic film |
EP16752198.8A EP3260268B1 (en) | 2015-02-20 | 2016-01-22 | Method for producing microporous plastic film |
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EP (1) | EP3260268B1 (ja) |
JP (1) | JP6757520B2 (ja) |
KR (1) | KR20170117428A (ja) |
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EP3875244B1 (en) * | 2018-10-29 | 2023-08-02 | Zuiko Corporation | Laminate production method and production device |
WO2020234552A1 (en) * | 2019-05-20 | 2020-11-26 | Dycem Limited | Method |
CN111430645A (zh) * | 2020-03-30 | 2020-07-17 | 安徽捷诚包装制品有限公司 | 一种pe与ptfe复合隔膜及其制备方法 |
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- 2016-01-22 HU HUE16752198A patent/HUE048832T2/hu unknown
- 2016-01-22 KR KR1020177022884A patent/KR20170117428A/ko not_active Application Discontinuation
- 2016-01-22 WO PCT/JP2016/051779 patent/WO2016132809A1/ja active Application Filing
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- 2016-01-22 EP EP16752198.8A patent/EP3260268B1/en active Active
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