WO2016002786A1 - 重合体組成物、積層フィルムおよびセパレータ - Google Patents
重合体組成物、積層フィルムおよびセパレータ Download PDFInfo
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- WO2016002786A1 WO2016002786A1 PCT/JP2015/068841 JP2015068841W WO2016002786A1 WO 2016002786 A1 WO2016002786 A1 WO 2016002786A1 JP 2015068841 W JP2015068841 W JP 2015068841W WO 2016002786 A1 WO2016002786 A1 WO 2016002786A1
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- polymer composition
- separator
- aromatic
- polymer
- solvent
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino-carboxylic acids or of polyamines and polycarboxylic acids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
-
- 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
- C08J9/36—After-treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a polymer composition containing a nitrogen-containing aromatic polymer and a solvent, a laminated film, and a separator.
- Non-aqueous electrolyte secondary batteries such as lithium secondary batteries are now widely used as batteries used in devices such as personal computers, mobile phones, and portable information terminals.
- non-aqueous electrolyte secondary batteries represented by lithium secondary batteries have high energy density. Therefore, when an internal short circuit or an external short circuit occurs due to battery damage or damage to equipment using the battery, a large current may flow and the nonaqueous electrolyte secondary battery may generate heat. Therefore, non-aqueous electrolyte secondary batteries are required to ensure high safety by preventing a certain amount of heat generation.
- a method for ensuring the safety of the non-aqueous electrolyte secondary battery a method of providing a shutdown function to the non-aqueous electrolyte secondary battery is generally used.
- the shutdown function is a function of preventing further heat generation by blocking the passage of ions between the positive electrode and the negative electrode by the separator when abnormal heat generation occurs in the non-aqueous electrolyte secondary battery.
- the separator disposed between the positive electrode and the negative electrode in the battery is abnormal.
- a porous film mainly composed of polyolefin that melts at, for example, about 80 to 180 ° C. when abnormal heat generation occurs is generally used.
- the separator mainly composed of the porous film has insufficient shape stability at high temperature, the separator contracts or a film breakage occurs in the separator while the shutdown function is executed. To do.
- the positive electrode and the negative electrode may be in direct contact with each other, causing an internal short circuit. That is, the separator mainly composed of the porous film may not be able to sufficiently suppress abnormal heat generation due to an internal short circuit. Therefore, a separator that can ensure higher safety is demanded.
- Patent Document 1 discloses a porous film obtained by coating a polymer composition containing an aromatic polymer such as aromatic aramid on a polyolefin microporous film. Has been proposed.
- the porous film obtained by applying the polymer composition described in Patent Document 1 did not have sufficient performance in terms of producing a separator having a good appearance.
- the present invention has been made in consideration of the above-mentioned problems, and its main purpose is a separator for a non-aqueous electrolyte secondary battery excellent in shape stability at high temperature, which is damaged by a battery or using a battery.
- This is a non-aqueous electrolyte secondary battery separator that can ensure high safety by preventing heat generation beyond a certain level even when an internal short circuit or an external short circuit occurs due to damage to the equipment. It is an object of the present invention to provide a polymer composition that is suitable for producing a separator having a good quality.
- the present inventor has intensively studied a polymer composition containing a nitrogen-containing aromatic polymer and a solvent. As a result, by adjusting the filtration blockage coefficient to a specific numerical range, it is a non-aqueous electrolyte secondary battery separator that can ensure high safety and has a good appearance. The inventors have found that the polymer composition is suitable and have completed the present invention.
- a polymer composition according to the present invention is a polymer composition containing a nitrogen-containing aromatic polymer and a solvent, and has a filtration blockage coefficient of 34 m 2 / m 3 or less. It is characterized by that.
- the present invention it is possible to provide a polymer composition suitable for producing a separator for a non-aqueous electrolyte secondary battery.
- the separator is (i) excellent in shape stability at high temperatures, and (ii) prevents heat generation beyond a certain level even when an internal short circuit or an external short circuit occurs due to damage to the battery or equipment using the battery. By doing so, high safety can be ensured and (iii) the appearance is good.
- a to B means A or more and B or less.
- the polymer composition according to the present invention is a polymer composition containing a nitrogen-containing aromatic polymer and a solvent, and has a filtration blockage coefficient of 34 m 2 / m 3 or less.
- the nitrogen-containing aromatic polymer (hereinafter simply referred to as an aromatic polymer) is an aromatic polymer having a nitrogen atom in the main chain (part of the main chain is composed of nitrogen atoms), and more Preferred is an aromatic polymer having a structure represented by —C ( ⁇ O) NH— in the main chain, more preferred is an aromatic polyamide, and particularly preferred is a wholly aromatic polyamide.
- the aromatic polyamide may be a para-oriented aromatic polyamide or a meta-oriented aromatic polyamide. However, the aromatic polyamide is more preferably a para-oriented aromatic polyamide because it has high mechanical strength and is easily porous.
- aromatic polyamide examples include poly (paraphenylene terephthalamide), poly (metaphenylene isophthalamide), poly (parabenzamide), poly (metabenzamide), and poly (4,4′-benz.
- Anilide terephthalamide poly (paraphenylene-4,4′-biphenylenedicarboxylic acid amide), poly (metaphenylene-4,4′-biphenylenedicarboxylic acid amide), poly (paraphenylene-2,6-naphthalenedicarboxylic acid amide) ), Poly (metaphenylene-2,6-naphthalenedicarboxylic acid amide), poly (2-chloroparaphenylene terephthalamide), paraphenylene terephthalamide / 2,6-dichloroparaphenylene terephthalamide copolymer, and metaphenylene terephthale Amide / , 6-dichloro-para-phenylene terephthalamide copolymer and the like.
- the aromatic polymer can be produced, for example, by reacting an aromatic diamine with a compound having a hydrolyzable reactive group that reacts with an amino group in a solvent. More specifically, an aromatic polymer having a structure represented by —C ( ⁇ O) NH— as the main chain is obtained by reacting, for example, an aromatic diamine with an amino group to —C ( ⁇ O). It can be produced by reacting a compound having a hydrolyzable reactive group that forms a structure represented by NH— in a solvent.
- the aromatic polymer contained in the polymer composition is used as a member (heat resistant porous layer) constituting a separator in the field of manufacturing non-aqueous electrolyte secondary batteries.
- the aromatic polymer is a heat-resistant resin, and a heat-resistant porous layer can be formed on the surface of the substrate by a simple method such as coating (application) on a substrate used as a separator and drying.
- the thickness of the heat resistant porous layer is preferably 1 ⁇ m or more and 10 ⁇ m or less, more preferably 1 ⁇ m or more and 5 ⁇ m or less, and particularly preferably 1 ⁇ m or more and 4 ⁇ m or less.
- the pore diameter of the pores of the heat resistant porous layer exceeds 0, preferably 3 ⁇ m or less, and more preferably 1 ⁇ m or less.
- the heat resistance of the separator can be improved to, for example, about 400 ° C.
- the heat resistant porous layer may contain a filler made of an organic powder or an inorganic powder having an average particle diameter of 0.01 ⁇ m or more and 1 ⁇ m or less, if necessary.
- thermoplastic resin As the base material used as the separator of the non-aqueous electrolyte secondary battery, a thermoplastic resin is suitable.
- the thermoplastic resin include polyolefins such as polyethylene, polypropylene, polybutene, and ethylene-propylene copolymer, and thermoplastic polyurethane.
- the thermoplastic resin is more preferably polyethylene.
- the polyethylene include low density polyethylene, high density polyethylene, linear polyethylene (ethylene- ⁇ -olefin copolymer), and ultrahigh molecular weight polyethylene having a molecular weight of 1 million or more.
- the aromatic diamine is more preferably 1,4-phenylenediamine.
- a reactive group-containing compound As a compound having an acyl group.
- the reactive group-containing compound includes, for example, an acid dianhydride, an acid dihalide, or a urea bond (—NH—C ( ⁇ O) NH—) by reacting with an amino group.
- the diisocyanate to be formed is mentioned.
- the compound having an acyl group is more preferably an aromatic compound.
- the acid dianhydride is more preferably an aromatic acid dianhydride.
- the aromatic dianhydride include pyromellitic dianhydride, 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride, 3,3 ′, 4,4′-benzophenone tetra
- aromatic acid dichloride is more preferable.
- aromatic acid dichloride include phthalic acid dichloride, terephthalic acid dichloride, pyromellitic acid dichloride, 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic acid dichloride, 3,3 ′, 4,4.
- aromatic diisocyanate is more preferable.
- aromatic diisocyanate examples include 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 1,2-naphthylene diisocyanate, 1,3-naphthylene diisocyanate, 1,4- Naphthylene diisocyanate, 1,5-naphthylene diisocyanate, 1,6-naphthylene diisocyanate, 1,7-naphthylene diisocyanate, 1,8-naphthylene diisocyanate, 2,3-naphthylene diisocyanate, 2,6-naphthylene diene Examples include isocyanate, 3,3′-biphenylene diisocyanate, 3,3′-benzophenone diisocyanate, and 3,3′-diphenylsulfone diisocyan
- the reactive group-containing compound is more preferably an aromatic acid dihalide, and more preferably terephthalic acid dichloride among the exemplified compounds. These reactive group-containing compounds may be used alone or in combination of two or more.
- the aromatic polymer is, for example, -20 ° C. to 50 ° C., more preferably, the aromatic diamine and the reactive group-containing compound in a solvent in which an alkali metal or alkaline earth metal chloride is dissolved. It can be obtained by reacting (polymerizing) at a reaction temperature of ⁇ 10 ° C. to 40 ° C.
- the molar ratio of the aromatic diamine to the reactive group-containing compound is usually 1.000 to 1.050, preferably 1.000 to 1.040. More preferably 1.000 to 1.030.
- the concentration of the chloride dissolved in the solvent is preferably 2% by weight to 10% by weight, and more preferably 3% by weight to 8% by weight.
- chloride examples include chlorides of alkali metals such as sodium chloride and potassium chloride, and chlorides of alkaline earth metals such as magnesium chloride and calcium chloride. Of these, calcium chloride is more preferable. These chlorides may be used alone or in combination of two or more.
- the solvent is more preferably an aprotic polar solvent.
- the aprotic polar solvent include organic solvents such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide, and N, N-dimethylformamide.
- the aprotic polar solvent is more preferably N-methyl-2-pyrrolidone. These solvents may be used alone or in combination of two or more.
- the water content of the solvent is preferably 200 ppm to 2500 ppm, more preferably 200 ppm to 1500 ppm, and even more preferably 250 ppm to 1000 ppm.
- the filtration blockage coefficient tends to increase.
- the water content of the solvent exceeds 2500 ppm, the aromatic polymer in the polymer composition is precipitated when the polymer composition is stored, or the aromaticity is sufficient to form a heat-resistant porous layer. Inconveniences such as inability to obtain a group polymer.
- the measuring method of the moisture content of a solvent is explained in full detail in an Example.
- the amount of the solvent used relative to the total amount of the aromatic diamine and the reactive group-containing compound is 0. It is preferably 5% by weight to 20% by weight, more preferably 1% by weight to 15% by weight, and even more preferably 3% by weight to 12% by weight.
- the aromatic polymer obtained by performing the reaction is, for example, an aromatic polymer having a structure represented by —C ( ⁇ O) NH— in the main chain, and has an intrinsic viscosity of 1.5 dL / g to It is 3.0 dL / g, more preferably 1.7 dL / g to 2.5 dL / g, and still more preferably 1.8 dL / g to 2.3 dL / g.
- the measuring method of intrinsic viscosity is explained in full detail in an Example.
- the intrinsic viscosity can be controlled by adjusting the molar ratio between the aromatic diamine and the reactive group-containing compound and the water content of the solvent.
- the intrinsic viscosity is less than 1.5 dL / g, since the molecular weight of the aromatic polymer is small, the elastic modulus of the heat-resistant porous layer to be formed is lowered, and the shrinkage is suppressed when the base material is melted by heat. Less effective.
- the intrinsic viscosity exceeds 3.0 dL / g, the molecular weight of the aromatic polymer becomes too large, so that the coating property when applying the polymer composition to the substrate is lowered, There is a tendency for the filtration blockage factor to increase.
- the polymer composition whose filtration blockage coefficient is 34 m ⁇ 2 > / m ⁇ 3 > or less, ie, an aromatic polymer, and a solvent, and the filtration blockage coefficient is 34 m ⁇ 2 > / m ⁇ 3 > or less.
- a polymer composition is obtained. That is, the solvent is preferably a solvent contained in the polymer composition after obtaining an aromatic polymer by reaction.
- the filtration blockage coefficient is a numerical value that serves as an index of the amount of insoluble component (gel component amount) of the aromatic polymer that is not dissolved in the solvent, contained in the polymer composition.
- the filtration blockage coefficient of the polymer composition is more than 0 m 2 / m 3 , preferably 34 m 2 / m 3 or less, more preferably 30 m 2 / m 3 or less, and 25 m 2 / m 3 or less. More preferably it is.
- the Gurley (air permeability) value of the separator manufactured using the polymer composition is high. As a result, the battery characteristics of the nonaqueous electrolyte secondary battery may be deteriorated.
- occlusion coefficient of a polymer composition is explained in full detail in an Example.
- the level of the filtration blockage factor can be controlled not only by the water content of the solvent used in the reaction and the intrinsic viscosity of the aromatic polymer, but also by the stirring efficiency of the reaction when producing the aromatic polymer.
- the stirring efficiency is increased, the filtration blocking coefficient tends to be lowered.
- Stirring efficiency, speed and the stirring blade can be adjusted by the amount of the reaction liquid to the reaction vessel, by adjusting these conditions appropriately, filtered blockage factor is 34m 2 / m 3 or less of the polymer composition Can be obtained.
- a heat resistant porous layer is formed on the surface of the substrate by, for example, applying (applying) the polymer composition to the substrate and then removing the solvent.
- a laminated film can be easily manufactured.
- the method of applying (applying) the polymer composition to the substrate and the method of removing the solvent from the applied (applied) solution are not particularly limited, and a known method can be appropriately employed. .
- the present invention includes a laminated film produced by the production method.
- multilayer film can be easily manufactured by employ
- the non-aqueous-electrolyte secondary battery containing the said separator can be easily manufactured by employ
- the solvent used to obtain the aromatic polymer and the solvent contained in the polymer composition may be the same as each other or different from each other, but may be the same as each other. More preferred.
- Moisture content The moisture content of the solvent was measured according to a conventional method using a Karl Fischer moisture meter.
- T is the flow time (seconds) of the aromatic polymer solution
- T 0 is the flow time (seconds) of the blank
- C is the concentration of the aromatic polymer in the aromatic polymer solution (g / dl).
- the polymer composition was filtered using a SUS filter (diameter: 25 mm) of 2000 mesh (pore diameter: 14 ⁇ m) while applying pressure of 1 kgf (approximately 9.8 N).
- occlusion coefficient was computed by following Formula.
- t / V K S ⁇ t + 1 / Q 0
- Filtration blockage factor H [unit: m 2 / m 3 ] A ⁇ K S
- A is the filtration area (m 2 )
- t is the filtration time (second)
- V is the filtration amount (m 3 )
- K S indicates the slope of the graph of t / V and t.
- 1 / Q 0 indicates the intercept in the graph of t / V and t.
- a laminated film as a separator having a heat-resistant porous layer was produced by applying the polymer composition to polyethylene as a base material. And the external appearance of the manufactured laminated film was visually observed and evaluated. Specifically, the heat-resistant porous layer (coating surface) formed on the substrate was evaluated as good when the evaluation was good and defective when it was poor.
- Weight per unit [unit: g / m 2 ] weight of sample piece (g) / (0.08 (m) ⁇ 0.08 (m)) Subsequently, the heat resistant basis weight was calculated by the following formula.
- poly (paraphenylene terephthalamide) (hereinafter abbreviated as PPTA), which is a wholly aromatic polyamide, was produced by the following method.
- a 500 ml separable flask having a stirring blade, a thermometer, a nitrogen inflow pipe and a powder addition port was used.
- the flask was sufficiently dried by flowing nitrogen into the flask, and then 409.2 g of N-methyl-2-pyrrolidone (hereinafter abbreviated as NMP) was added to the flask as a solvent, and calcium chloride as a chloride.
- NMP N-methyl-2-pyrrolidone
- 30.8 g (used at 200 ° C. for 2 hours under vacuum drying) was added and the temperature was raised to 100 ° C. to completely dissolve calcium chloride. Thereafter, the temperature of the obtained solution was returned to room temperature (25 ° C.), and the water content of the solution was adjusted to 500 ppm.
- PPD paraphenylenediamine
- TPC terephthalic acid dichloride
- the obtained PPTA showed optical anisotropy.
- the PPTA weight was 6.0 when the total weight of PPTA (PPD + TPC), calcium chloride and NMP was 100. That is, the concentration of PPTA in the PPTA solution was 6.0% by weight.
- a 500 ml separable flask having a stirring blade, a thermometer, a nitrogen inlet tube and a liquid addition port was used.
- the flask was sufficiently dried by flowing nitrogen into the flask, and 100 g of the obtained PPTA solution was weighed into the flask. Thereafter, 300 g of NMP was added and stirred for 10 minutes at a rotation speed of 300 rpm. Thereby, a polymer composition was obtained.
- the concentration of PPTA in the polymer composition was 1.5% by weight.
- a polyethylene porous film As a substrate, a polyethylene porous film was used (thickness: 25 ⁇ m, Gurley: 85 seconds / 100 ml, basis weight 12 g / m 2 ). And the said porous film was fixed with the adhesive tape on the polyethylene terephthalate (PET) film whose thickness is 100 micrometers. Thereafter, the polymer composition was coated on the porous film using a bar coater manufactured by Tester Sangyo Co., Ltd. Next, the porous film on which the coating film of the polymer composition is formed while being fixed to the PET film is placed in an atmosphere of 50 ° C. and a humidity of 70% for 1 minute to precipitate PPTA which is an aromatic polymer. It was.
- PET polyethylene terephthalate
- porous film porous film laminated with PPTA
- a water tank filled with ion-exchanged water ion-exchanged water
- the PET film was peeled off from the porous film.
- ion exchange water was further passed to remove calcium chloride and NMP from the porous film.
- the porous film was dried in an oven at 70 ° C. for 10 minutes to obtain a laminated film (coated product) as a separator.
- Table 1 summarizes the amount of raw materials charged. And the result of the physical-property evaluation of the said polymer composition and laminated film was described in Table 2.
- Example 3 A polymer composition and a laminated film were obtained by performing the same operation and reaction as in Example 1 except that the stirring power was changed by changing the number of revolutions at the time of preparing the PPTA solution from 150 rpm to 75 rpm. .
- the amount of raw materials charged is shown in Table 1 together.
- the result of the physical-property evaluation of the said polymer composition and laminated film was described in Table 2.
- the method for producing an aromatic polymer according to the present invention can be widely used, for example, in the field of producing a non-aqueous electrolyte secondary battery capable of ensuring high safety.
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Abstract
Description
カール・フィッシャー水分率計を用いて定法に従い、溶媒の含水率を測定した。
100mlの96%~98%硫酸に0.5gの芳香族重合体を溶解した芳香族重合体溶液を調製した。また、96%~98%硫酸をブランクとして用意した。前記芳香族重合体溶液およびブランクに関して、それぞれ毛細管粘度計を用いて定法に従い、30℃での流動時間を測定した。得られた流動時間の比から、次式により固有粘度を算出した。
式中、Tは芳香族重合体溶液の流動時間(秒)であり、T0はブランクの流動時間(秒)であり、Cは芳香族重合体溶液における芳香族重合体の濃度(g/dl)を示す。
濾過閉塞係数の測定方法は、改訂六版化学工学便覧(1999年2月25日発行、発行所:丸善株式会社、編者:社団法人化学工学会)の813頁における、「15 固液・固気分離」の「15・3 濾過・圧搾」の「表15・6 閉塞濾過式」に記載されている式を用いて算出した。
濾過閉塞係数 H 〔単位:m2/m3〕=A×KS
式中、Aは濾過面積(m2)であり、tは濾過時間(秒)であり、Vは濾過量(m3)であり、KSはt/Vとtのグラフでの傾きを示し、1/Q0はt/Vとtのグラフでの切片を示す。
重合体組成物を基材であるポリエチレンに塗工することにより、耐熱多孔層を形成した。そして、形成した耐熱多孔層に筋が無いかどうかを目視にて観察して評価した。評価は、多孔層における塗工方向と直交する方向を観察したときに、2本以上の筋が存在する領域があるものを不良とし、2本以上の筋が存在する領域が無いもの(筋が1本以下のもの)を良好とした。
重合体組成物を基材であるポリエチレンに塗工することにより、耐熱多孔層を有するセパレータとしての積層フィルムを製造した。そして、製造した積層フィルムの外観を目視にて観察して評価した。具体的には、基材上に形成した耐熱多孔層(塗工面)の前記評価が良好のものは良好、不良のものは不良とした。
基材および積層フィルムをそれぞれ8cm四方の大きさの試料片に切り出し、次式により目付を算出した。
次いで、次式により耐熱目付を算出した。
(7) ガーレー(透気度)
基材および積層フィルム(塗工品)のガーレー(透気度)〔単位:秒/100 ml〕は、JIS P8117に基づいて、株式会社東洋精機製作所製のガーレー式デンソメーターを用いて測定した。
芳香族重合体として、全芳香族ポリアミドであるポリ(パラフェニレンテレフタルアミド)(以下、PPTAと略す)を以下の方法により製造した。
TPCの添加量を24.22gに変更(PPD/TPC=1.023)した以外は、実施例1と同様の操作および反応を行い、重合体組成物および積層フィルムを得た。原料等の仕込み量をまとめて表1に記載した。そして、前記重合体組成物および積層フィルムの物性評価の結果を表2に記載した。
PPTAの溶液を作製するときの回転数を150rpmから75rpmに変更することで、攪拌動力を変更した以外は、実施例1と同様の操作および反応を行い、重合体組成物および積層フィルムを得た。原料等の仕込み量をまとめて表1に記載した。そして、前記重合体組成物および積層フィルムの物性評価の結果を表2に記載した。
NMP、塩化カルシウム、PPDおよびTPCの量を、それぞれ260.4g、19.6g、8.40gおよび15.39gに変更(PPD/TPC=1.025)した以外は、実施例1と同様の操作および反応を行い、重合体組成物および積層フィルムを得た。原料等の仕込み量をまとめて表1に記載した。そして、前記重合体組成物および積層フィルムの物性評価の結果を表2に記載した。
溶液の含水率を120ppmとなるように調整し、TPCの量を24.30gに変更(PPD/TPC=1.020)した以外は、実施例1と同様の操作および反応を行い、重合体組成物および積層フィルムを得た。原料等の仕込み量をまとめて表1に記載した。そして、前記重合体組成物および積層フィルムの物性評価を行おうとした。しかしながら、得られたPPTAの溶液は流動性が無いため、濾過閉塞係数を算出することはできなかった(測定不能)。また、PPTAの溶液は基材に塗工することができず、従って、耐熱多孔層を形成することはできなかった(評価不能)。さらに、耐熱多孔層を形成することができないため、積層フィルムを得ることもできなかった(測定不能)。比較例1の結果を表2に記載した。
Claims (8)
- 含窒素芳香族重合体と、溶媒とを含む重合体組成物であって、
濾過閉塞係数が34m2/m3以下である、重合体組成物。 - 前記含窒素芳香族重合体が全芳香族ポリアミドである、請求項1に記載の重合体組成物。
- 前記溶媒が非プロトン性の極性溶媒である、請求項1または2に記載の重合体組成物。
- 前記含窒素芳香族重合体の固有粘度が1.5dL/g~3.0dL/gである、請求項1~3の何れか一項に記載の重合体組成物。
- 前記溶媒の含水率が200ppm~2500ppmである、請求項1~4の何れか一項に記載の重合体組成物。
- 請求項1~5の何れか一項に記載の重合体組成物を基材に塗工してなる積層フィルム。
- 請求項6に記載の積層フィルムを含むセパレータ。
- 請求項7に記載のセパレータを含む非水電解液二次電池。
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