JP6119945B1 - Aqueous resin composition for heat-resistant layer of lithium ion secondary battery - Google Patents
Aqueous resin composition for heat-resistant layer of lithium ion secondary battery Download PDFInfo
- Publication number
- JP6119945B1 JP6119945B1 JP2017501043A JP2017501043A JP6119945B1 JP 6119945 B1 JP6119945 B1 JP 6119945B1 JP 2017501043 A JP2017501043 A JP 2017501043A JP 2017501043 A JP2017501043 A JP 2017501043A JP 6119945 B1 JP6119945 B1 JP 6119945B1
- Authority
- JP
- Japan
- Prior art keywords
- heat
- secondary battery
- resin composition
- resistant layer
- lithium ion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011342 resin composition Substances 0.000 title claims abstract description 63
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 57
- 229920001577 copolymer Polymers 0.000 claims abstract description 37
- 125000000524 functional group Chemical group 0.000 claims abstract description 26
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 23
- 239000012736 aqueous medium Substances 0.000 claims abstract description 13
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 5
- 125000005370 alkoxysilyl group Chemical group 0.000 claims description 3
- XMYQHJDBLRZMLW-UHFFFAOYSA-N methanolamine Chemical group NCO XMYQHJDBLRZMLW-UHFFFAOYSA-N 0.000 claims description 3
- 230000020169 heat generation Effects 0.000 abstract description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 45
- 239000000178 monomer Substances 0.000 description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 40
- 238000006243 chemical reaction Methods 0.000 description 28
- -1 polyoxyethylene chain Polymers 0.000 description 24
- 239000002904 solvent Substances 0.000 description 17
- 239000000203 mixture Substances 0.000 description 16
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 14
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 12
- 229920000642 polymer Polymers 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- AVTLBBWTUPQRAY-UHFFFAOYSA-N 2-(2-cyanobutan-2-yldiazenyl)-2-methylbutanenitrile Chemical compound CCC(C)(C#N)N=NC(C)(CC)C#N AVTLBBWTUPQRAY-UHFFFAOYSA-N 0.000 description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000003960 organic solvent Substances 0.000 description 8
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 7
- RCEJCSULJQNRQQ-UHFFFAOYSA-N 2-methylbutanenitrile Chemical compound CCC(C)C#N RCEJCSULJQNRQQ-UHFFFAOYSA-N 0.000 description 7
- 102100026735 Coagulation factor VIII Human genes 0.000 description 7
- 101000911390 Homo sapiens Coagulation factor VIII Proteins 0.000 description 7
- AVTLBBWTUPQRAY-BUHFOSPRSA-N V-59 Substances CCC(C)(C#N)\N=N\C(C)(CC)C#N AVTLBBWTUPQRAY-BUHFOSPRSA-N 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 7
- 230000007928 solubilization Effects 0.000 description 7
- 238000005063 solubilization Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- 239000002202 Polyethylene glycol Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920001223 polyethylene glycol Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 150000002148 esters Chemical class 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 5
- 239000005995 Aluminium silicate Substances 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 235000012211 aluminium silicate Nutrition 0.000 description 4
- 150000007514 bases Chemical class 0.000 description 4
- 239000011256 inorganic filler Substances 0.000 description 4
- 229910003475 inorganic filler Inorganic materials 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004014 plasticizer Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000003505 polymerization initiator Substances 0.000 description 3
- 229920005672 polyolefin resin Polymers 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 2
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 239000003429 antifungal agent Substances 0.000 description 2
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- 239000003054 catalyst Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
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- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
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- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
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- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
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- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium peroxydisulfate Substances [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 1
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
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- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
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- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- NDKBVBUGCNGSJJ-UHFFFAOYSA-M benzyltrimethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)CC1=CC=CC=C1 NDKBVBUGCNGSJJ-UHFFFAOYSA-M 0.000 description 1
- 125000004106 butoxy group Chemical group [*]OC([H])([H])C([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
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- 238000001816 cooling Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 239000002781 deodorant agent Substances 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- 229910001649 dickite Inorganic materials 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- ZLNAFSPCNATQPQ-UHFFFAOYSA-N ethenyl-dimethoxy-methylsilane Chemical compound CO[Si](C)(OC)C=C ZLNAFSPCNATQPQ-UHFFFAOYSA-N 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 229910052621 halloysite Inorganic materials 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- CAAULPUQFIIOTL-UHFFFAOYSA-N methyl dihydrogen phosphate Chemical compound COP(O)(O)=O CAAULPUQFIIOTL-UHFFFAOYSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229950010765 pivalate Drugs 0.000 description 1
- IUGYQRQAERSCNH-UHFFFAOYSA-N pivalic acid Chemical compound CC(C)(C)C(O)=O IUGYQRQAERSCNH-UHFFFAOYSA-N 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 229910052903 pyrophyllite Inorganic materials 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- WYKYCHHWIJXDAO-UHFFFAOYSA-N tert-butyl 2-ethylhexaneperoxoate Chemical compound CCCCC(CC)C(=O)OOC(C)(C)C WYKYCHHWIJXDAO-UHFFFAOYSA-N 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C08L101/06—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
-
- 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
-
- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
-
- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Cell Separators (AREA)
- Macromonomer-Based Addition Polymer (AREA)
Abstract
水酸基、自己縮合性官能基、及び下記一般式（１）で表される構造を有する共重合体（Ａ）と、水性媒体（Ｂ）とを含有するリチウムイオン二次電池耐熱層用水性樹脂組成物であって、前記共重合体（Ａ）の水酸基価が１００〜４７０の範囲であり、自己縮合性官能基濃度が０．１〜２ｍｍｏｌ／ｇの範囲であることを特徴とするリチウムイオン二次電池耐熱層用水性樹脂組成物を提供する。このリチウムイオン二次電池耐熱層用水性樹脂組成物は、セパレータを構成する多孔体との密着性に優れ、発熱の際にリチウムイオン二次電池の短絡（ショート）を防止可能なレベルの耐熱性を備えた耐熱層が得られる。（式中、Ｒは炭素原子数１〜４のアルキル基であり、ｎは５〜１００の整数である。）An aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery comprising a hydroxyl group, a self-condensable functional group, a copolymer (A) having a structure represented by the following general formula (1), and an aqueous medium (B) Wherein the copolymer (A) has a hydroxyl value in the range of 100 to 470 and a self-condensable functional group concentration in the range of 0.1 to 2 mmol / g. An aqueous resin composition for a secondary battery heat-resistant layer is provided. This aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery has excellent adhesion to the porous body constituting the separator, and has a heat resistance level that can prevent a short circuit of the lithium ion secondary battery during heat generation. Is obtained. (In the formula, R is an alkyl group having 1 to 4 carbon atoms, and n is an integer of 5 to 100.)
Description
本発明は、リチウムイオン二次電池のセパレータの耐熱層に使用可能な水性樹脂組成物に関する。 The present invention relates to an aqueous resin composition that can be used for a heat-resistant layer of a separator of a lithium ion secondary battery.
リチウムイオン二次電池の製造に使用するセパレータとしては、一般に、ポリオレフィン樹脂等を用いて得られる多孔体を使用することが多い。リチウムイオン二次電池は、通常、電解液中のイオンが前記セパレータを構成する孔を介して移動することによって、電池としての機能を発揮する。 Generally as a separator used for manufacture of a lithium ion secondary battery, the porous body obtained using polyolefin resin etc. is often used. A lithium ion secondary battery normally exhibits its function as a battery when ions in the electrolyte move through the holes constituting the separator.
一方、前記リチウムイオン二次電池の出力が増大するなかで、前記リチウムイオン二次電池には、異常発熱に起因した発火等を引き起こす可能性があるという問題が懸念されている。 On the other hand, as the output of the lithium ion secondary battery increases, there is a concern that the lithium ion secondary battery may cause ignition or the like due to abnormal heat generation.
前記発火等を防止する方法としては、例えば前記リチウムイオン二次電池が発熱した際に、前記セパレータの微多孔がその熱の影響によって無孔化しうるセパレータを使用する方法が知られている。これにより、電解液内におけるイオンの伝導を停止し、さらなる発熱や発火を防止することが期待されている。 As a method for preventing the ignition or the like, for example, a method is known in which when the lithium ion secondary battery generates heat, a separator in which the micropores of the separator can be made nonporous by the influence of heat is known. This is expected to stop the conduction of ions in the electrolyte and prevent further heat generation and ignition.
しかし、前記セパレータは、その熱の影響によって著しい収縮を引き起こし、その結果、電解液内におけるイオンの伝導を停止することができず、リチウムイオン二次電池の短絡（ショート）を引き起こす可能性を有していた。 However, the separator causes significant shrinkage due to the influence of heat, and as a result, it is impossible to stop the conduction of ions in the electrolyte solution, which may cause a short circuit of the lithium ion secondary battery. Was.
熱収縮を引き起こしにくいセパレータとしては、ポリオレフィン樹脂等を用いて得られる多孔体の表面に、多孔状の耐熱層を設けたものが知られており、例えば、ポリオレフィン樹脂を主成分とする多孔膜の少なくとも片面に、無機粒子と樹脂製バインダーとを含む多孔層を備えた多層多孔膜であって、前記樹脂製バインダーが、（メタ）アクリル酸エステル単量体から選ばれる１種以上の単量体と、不飽和カルボン酸単量体と、架橋性単量体とを原料単位として含む共重合体であることを特徴とする多層多孔膜が知られている（例えば、特許文献１参照。）。 As a separator that hardly causes thermal shrinkage, a separator having a porous heat-resistant layer provided on the surface of a porous body obtained using a polyolefin resin or the like is known. A multilayer porous membrane having a porous layer containing inorganic particles and a resin binder on at least one surface, wherein the resin binder is one or more monomers selected from (meth) acrylate monomers A multilayer porous membrane is known which is a copolymer containing an unsaturated carboxylic acid monomer and a crosslinkable monomer as raw material units (see, for example, Patent Document 1).
しかし、ポリオレフィン樹脂等を用いて得られる多孔状のセパレータの表面と、耐熱層との密着性が十分でないため、その界面で経時的な剥離を引き起こし、その結果、異常発熱の際にリチウムイオン二次電池の短絡（ショート）を引き起こす可能性があった。 However, the adhesion between the surface of the porous separator obtained using a polyolefin resin or the like and the heat-resistant layer is not sufficient, and this causes peeling over time at the interface. There was a possibility of causing a short circuit of the secondary battery.
本発明が解決しようとする課題は、セパレータを構成する多孔体との密着性に優れ、発熱の際にリチウムイオン二次電池の短絡（ショート）を防止可能なレベルの耐熱性を備えた耐熱層が得られる水性樹脂組成物を提供することである。 The problem to be solved by the present invention is a heat-resistant layer having a heat resistance level that is excellent in adhesion to the porous body constituting the separator and that can prevent a short circuit of the lithium ion secondary battery during heat generation. Is to provide an aqueous resin composition.
本発明者等は、上記課題を解決すべく鋭意研究を重ねた結果、特定の官能基及び構造を特定の比率で有する共重合体と、水性媒体とを含有する水性樹脂組成物を用いることで、上記課題を解決できることを見出し、本発明を完成した。 As a result of intensive studies to solve the above problems, the present inventors have used an aqueous resin composition containing a copolymer having a specific functional group and structure at a specific ratio and an aqueous medium. The present inventors have found that the above problems can be solved and completed the present invention.
すなわち、本発明は、水酸基、自己縮合性官能基、及び下記一般式（１）で表される構造を有する共重合体（Ａ）と、水性媒体（Ｂ）とを含有するリチウムイオン二次電池耐熱層用水性樹脂組成物であって、前記共重合体（Ａ）の水酸基価が１００〜４７０の範囲であり、自己縮合性官能基濃度が０．１〜２ｍｍｏｌ／ｇの範囲であることを特徴とするリチウムイオン二次電池耐熱層用水性樹脂組成物。 That is, the present invention provides a lithium ion secondary battery containing a hydroxyl group, a self-condensable functional group, a copolymer (A) having a structure represented by the following general formula (1), and an aqueous medium (B). An aqueous resin composition for a heat-resistant layer, wherein the copolymer (A) has a hydroxyl value in the range of 100 to 470 and a self-condensable functional group concentration in the range of 0.1 to 2 mmol / g. An aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery, which is characterized.
本発明のリチウムイオン二次電池耐熱層用水性樹脂組成物は、フィラーの分散性及びセパレータへの密着性に優れ、熱収縮率の小さいセパレータが得られることから、リチウムイオン二次電池耐熱層に好適に用いることができる。 Since the aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery of the present invention is excellent in filler dispersibility and adhesion to a separator, and a separator having a small heat shrinkage rate is obtained, It can be used suitably.
本発明のリチウムイオン二次電池耐熱層用水性樹脂組成物は、水酸基、自己縮合性官能基、及び下記一般式（１）で表される構造を有する共重合体（Ａ）と、水性媒体（Ｂ）とを含有するリチウムイオン二次電池耐熱層用水性樹脂組成物であって、前記共重合体（Ａ）の水酸基価が１００〜４７０の範囲であり、自己縮合性官能基濃度が０．１〜２ｍｍｏｌ／ｇの範囲であることを特徴とするリチウムイオン二次電池耐熱層用水性樹脂組成物。 An aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery of the present invention comprises a hydroxyl group, a self-condensable functional group, a copolymer (A) having a structure represented by the following general formula (1), an aqueous medium ( B) an aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery, wherein the copolymer (A) has a hydroxyl value in the range of 100 to 470 and a self-condensable functional group concentration of 0.00. An aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery, characterized by being in the range of 1 to 2 mmol / g.
まず、前記共重合体（Ａ）について説明する。前記共重合体（Ａ）の水酸基価は１００〜４７０の範囲であるが、耐熱フィラーの分散性、及び基材への密着性がより向上することから、１２０〜４３０の範囲が好ましく、１５０〜４００の範囲がより好ましい。 First, the copolymer (A) will be described. Although the hydroxyl value of the copolymer (A) is in the range of 100 to 470, the dispersibility of the heat resistant filler and the adhesion to the base material are further improved, so the range of 120 to 430 is preferable, and 150 to A range of 400 is more preferred.
なお、本発明における共重合体（Ａ）の水酸基価とは、共重合体（Ａ）の原料である単量体成分中の水酸基を有する単量体の質量％から計算により求めた値である。 The hydroxyl value of the copolymer (A) in the present invention is a value obtained by calculation from the mass% of the monomer having a hydroxyl group in the monomer component that is a raw material of the copolymer (A). .
前記共重合体（Ａ）の有する自己縮合性官能基としては、自己縮合性を有する官能基であればよいが、耐熱性がより向上することから、アルコキシシリル基、Ｎ−ヒドロキシメチルアミド基、及びＮ−アルコキシメチルアミド基が好ましい。また、前記共重合体（Ａ）の自己縮合性官能基濃度は０．１〜２ｍｍｏｌ／ｇの範囲であるが、セパレータへの密着性と耐熱収縮性がより向上することから、０．１５〜１．５ｍｍｏｌ／ｇの範囲が好ましく、０．２〜１ｍｍｏｌ／ｇの範囲がより好ましい。 The self-condensable functional group of the copolymer (A) may be any functional group having self-condensation, but since the heat resistance is further improved, an alkoxysilyl group, an N-hydroxymethylamide group, And N-alkoxymethylamide groups are preferred. Further, the concentration of the self-condensable functional group of the copolymer (A) is in the range of 0.1 to 2 mmol / g, but the adhesion to the separator and the heat shrinkage are further improved. The range of 1.5 mmol / g is preferable, and the range of 0.2-1 mmol / g is more preferable.
なお、本発明における共重合体（Ａ）の自己縮合性官能基濃度とは、共重合体（Ａ）の原料である単量体成分中の自己縮合性官能基を有する単量体の質量％から計算により求めた値である。 The concentration of the self-condensable functional group of the copolymer (A) in the present invention is the mass% of the monomer having a self-condensable functional group in the monomer component that is the raw material of the copolymer (A). It is a value obtained by calculation from
前記共重合体（Ａ）は、一般式（１）で表される構造を有し、一般式（１）中のＲは炭素原子数１〜４のアルキル基であるが、水中分散安定性がより向上することから、メチル基が好ましい。 The copolymer (A) has a structure represented by the general formula (1), and R in the general formula (1) is an alkyl group having 1 to 4 carbon atoms. A methyl group is preferred because it improves further.
前記共重合体（Ａ）は、一般式（１）で表される構造を有し、一般式（１）中のｎは５〜１００の整数であるが、水中分散安定性及び耐熱フィラー配合安定性がより向上することから、１０〜１００の整数が好ましく、２０〜９０の整数がより好ましい。 The copolymer (A) has a structure represented by the general formula (1), and n in the general formula (1) is an integer of 5 to 100. From the viewpoint of improving the properties, an integer of 10 to 100 is preferable, and an integer of 20 to 90 is more preferable.
また、前記共重合体（Ａ）の有するポリオキシエチレン鎖としては、前記共重合体（Ａ）中の３〜５０質量％の範囲が好ましい。 Moreover, as a polyoxyethylene chain which the said copolymer (A) has, the range of 3-50 mass% in the said copolymer (A) is preferable.
前記共重合体（Ａ）は、例えば、水酸基を有する単量体（ａ１）、自己縮合性官能基を有する単量体（ａ２）、及び一般式（１）で表される構造を有する単量体（ａ３）を必須原料として共重合することにより得られる。 The copolymer (A) is, for example, a monomer having a structure represented by the monomer (a1) having a hydroxyl group, the monomer (a2) having a self-condensable functional group, and the general formula (1). It can be obtained by copolymerizing the body (a3) as an essential raw material.
前記水酸基を有する単量体（ａ１）としては、例えば、２−ヒドロキシエチル（メタ）アクリレート、３−ヒドロキシプロピル（メタ）アクリレート、４−ヒドロキシ−ｎ−ブチル（メタ）アクリレート、２−ヒドロキシプロピル（メタ）アクリレート、２−ヒドロキシ−ｎ−ブチル（メタ）アクリレート、３−ヒドロキシ−ｎ−ブチル（メタ）アクリレート、１，４−シクロヘキサンジメタノールモノ（メタ）アクリレート、Ｎ−（２−ヒドロキシエチル）（メタ）アクリルアミド、グリセリンモノ（メタ）アクリレート、ポリエチレングリコールモノ（メタ）アクリレート、ポリプロピレングリコールモノ（メタ）アクリレート、２−ヒドロキシ−３−フェノキシプロピル（メタ）アクリレート、２−（メタ）アクリロイルオキシエチル−２−ヒドロキシエチルフタレート、末端に水酸基を有するラクトン変性（メタ）アクリレート等が挙げられる。なお、これらの水酸基を有する単量体（ａ１）は、単独で用いることも２種以上併用することもできる。 Examples of the monomer (a1) having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxy-n-butyl (meth) acrylate, 2-hydroxypropyl ( (Meth) acrylate, 2-hydroxy-n-butyl (meth) acrylate, 3-hydroxy-n-butyl (meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, N- (2-hydroxyethyl) ( (Meth) acrylamide, glycerin mono (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 2- (meth) acryloyloxyethyl 2-hydroxyethyl phthalate, lactone-modified (meth) acrylate having a hydroxy group at the terminal thereof. In addition, the monomer (a1) which has these hydroxyl groups can be used individually or can be used together 2 or more types.
なお、本発明において、「（メタ）アクリロイル」とは、アクリロイルとメタクリロイル基の一方又は両方をいい、「（メタ）アクリレート」とは、アクリレートとメタクリレートの一方又は両方をいい、「（メタ）アクリル」とは、アクリルとメタクリルの一方又は両方をいう。 In the present invention, “(meth) acryloyl” refers to one or both of acryloyl and methacryloyl groups, “(meth) acrylate” refers to one or both of acrylate and methacrylate, and “(meth) acrylic” "Means one or both of acrylic and methacrylic.
前記自己縮合性官能基を有する単量体（ａ２）としては、例えば、Ｎ−ヒドロキシメチル（メタ）アクリルアミド等のＮ−ヒドロキシメチルアミド基を有する単量体；Ｎ−ブトキシメチルアクリルアミド等のＮ−アルコキシメチルアミド基を有する単量体；ビニルトリメトキシシラン、ビニルトリエトキシシラン、ビニルメチルジメトキシシラン、３−（メタ）アクリロイルオキシプロピルトリメトキシシラン、３−（メタ）アクリロイルオキシプロピルトリエトキシシラン、３−（メタ）アクリロイルオキシプロピルメチルジメトキシシラン等のアルコキシシリル基を有する単量体などが挙げられる。なお、これらの自己縮合性官能基を有する単量体（ａ２）は、単独で用いることも２種以上併用することもできる。 Examples of the monomer (a2) having a self-condensable functional group include a monomer having an N-hydroxymethylamide group such as N-hydroxymethyl (meth) acrylamide; and N- such as N-butoxymethylacrylamide. Monomers having an alkoxymethylamide group: vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, 3- (meth) acryloyloxypropyltrimethoxysilane, 3- (meth) acryloyloxypropyltriethoxysilane, 3 -Monomers having an alkoxysilyl group such as (meth) acryloyloxypropylmethyldimethoxysilane. These monomers (a2) having a self-condensable functional group can be used alone or in combination of two or more.
前記一般式（１）で表される構造を有する単量体（ａ３）としては、例えば、メトキシポリエチレングリコール（メタ）アクリレート、エトキシポリエチレングリコール（メタ）アクリレート、プロポキシポリエチレングリコール（メタ）アクリレート、ブトキシポリエチレングリコール（メタ）アクリレート等が挙げられるが、これらの中でも、水中分散安定性がより向上することから、メトキシポリエチレングリコール（メタ）アクリレートが好ましく、分子量が１０００〜４０００のメトキシポリエチレングリコール（メタ）アクリレートがさらに好ましい。 Examples of the monomer (a3) having the structure represented by the general formula (1) include methoxy polyethylene glycol (meth) acrylate, ethoxy polyethylene glycol (meth) acrylate, propoxy polyethylene glycol (meth) acrylate, and butoxy polyethylene. Although glycol (meth) acrylate etc. are mentioned, Among these, since dispersion stability in water improves more, methoxypolyethyleneglycol (meth) acrylate is preferable and methoxypolyethyleneglycol (meth) acrylate with a molecular weight of 1000-4000 is preferable. Further preferred.
さらに、前記共重合体（Ａ）の原料として、前記単量体（ａ１）、（ａ２）、（ａ３）以外のその他の単量体（ａ４）を用いても構わない。その他の単量体（ａ４）としては、例えば、メチル（メタ）アクリレート、エチル（メタ）アクリレート、プロピル（メタ）アクリレート、ｎ−ブチル（メタ）アクリレート、ｉ−ブチル（メタ）アクリレート、ｔ−ブチル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート、２−エチルヘキシル（メタ）アクリレート、ラウリル（メタ）アクリレート、ステアリル（メタ）アクリレート、イソボルニル（メタ）アクリレート等のアルキル（メタ）アクリレート；Ｎ，Ｎ−ジメチルアミノエチル（メタ）アクリレート、Ｎ，Ｎ−ジエチルアミノエチル（メタ）アクリレート、Ｎ，Ｎ−ジメチルアミノプロピル（メタ）アクリレート、Ｎ，Ｎ−ジエチルアミノプロピル（メタ）アクリレート等のアミノ基を有する（メタ）アクリレート；ポリエチレングリコール（メタ）アクリレート、メトキシポリエチレングリコール（メタ）アクリレート、ポリプロピレングリコール（メタ）アクリレート、メトキシポリプロピレングリコール（メタ）アクリレート、ポリブチレングリコール（メタ）アクリレート、メトキシポリブチレングリコール（メタ）アクリレート等のポリアルキレングリコール（メタ）アクリレート；（メタ）アクリル酸、クロトン酸等の不飽和モノカルボン酸；イタコン酸（無水物）、マレイン酸（無水物）、フマル酸等の不飽和ジカルボン酸；スチレン、α−メチルスチレン、パラメチルスチレン、クロロメチルスチレン、酢酸ビニル等のビニル単量体；テトラヒドロフルフリル（メタ）アクリレート、ベンジル（メタ）アクリレート、グリシジル（メタ）アクリレートなどが挙げられる。これらの重合性単量体は、単独で用いることも２種以上併用することもできる。 Furthermore, you may use other monomers (a4) other than the said monomer (a1), (a2), (a3) as a raw material of the said copolymer (A). Examples of the other monomer (a4) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, and t-butyl. Alkyl (meth) acrylates such as (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isobornyl (meth) acrylate; N, N-dimethylamino (Meth) acrylates having amino groups such as ethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate and the like Poly (polyethylene glycol (meth) acrylate, methoxy polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methoxypolypropylene glycol (meth) acrylate, polybutylene glycol (meth) acrylate, methoxypolybutylene glycol (meth) acrylate, etc. Alkylene glycol (meth) acrylate; unsaturated monocarboxylic acids such as (meth) acrylic acid and crotonic acid; unsaturated dicarboxylic acids such as itaconic acid (anhydride), maleic acid (anhydride) and fumaric acid; styrene, α- Vinyl monomers such as methylstyrene, paramethylstyrene, chloromethylstyrene, vinyl acetate; tetrahydrofurfuryl (meth) acrylate, benzyl (meth) acrylate, glycidyl (meth) An acrylate etc. are mentioned. These polymerizable monomers can be used alone or in combination of two or more.
また、前記単量体（ａ１）の使用量は、耐熱フィラーの分散性、及び基材への密着性がより向上することから、前記共重合体（Ａ）の原料である単量体成分中の３５〜９５質量％の範囲が好ましく、４０〜９０質量％の範囲がより好ましい。前記単量体（ａ２）の使用量は、セパレータへの密着性と耐熱収縮性がより向上することから、前記共重合体（Ａ）の原料である単量体成分中の１〜２０質量％の範囲が好ましく、１〜１５質量％の範囲がより好ましい。前記単量体（ａ３）の使用量は、耐熱フィラーの分散性がより向上することから、前記共重合体（Ａ）の原料である単量体成分中の３〜５０質量％の範囲が好ましく、５〜３０質量％の範囲がより好ましい。なお、前記その他の単量体（ａ４）の使用量は、前記共重合体（Ａ）の原料である単量体成分の合計１００質量％から上記の単量体（ａ１）、単量体（ａ２）及び単量体（ａ３）の使用比率を除いた残部となる。 Further, the amount of the monomer (a1) used is such that the dispersibility of the heat-resistant filler and the adhesion to the base material are further improved, so that the monomer component (A) is a raw material. The range of 35-95 mass% is preferable, and the range of 40-90 mass% is more preferable. The amount of the monomer (a2) used is 1 to 20% by mass in the monomer component which is a raw material of the copolymer (A) because the adhesion to the separator and the heat shrinkage are further improved. The range of 1-15 mass% is more preferable. The amount of the monomer (a3) used is preferably in the range of 3 to 50% by mass in the monomer component that is the raw material of the copolymer (A) because the dispersibility of the heat-resistant filler is further improved. The range of 5-30 mass% is more preferable. In addition, the usage-amount of the said other monomer (a4) is said monomer (a1), monomer (from the total 100 mass% of the monomer component which is a raw material of the said copolymer (A). This is the balance excluding the use ratio of a2) and monomer (a3).
前記共重合体（Ａ）は、例えば、前記単量体（ａ１）、前記単量体（ａ２）、前記単量体（ａ３）、必要に応じて前記その他の単量体（ａ４）を、有機溶剤及び／又は水中で、重合開始剤存在下、５０〜１４０℃の温度で加熱しラジカル重合することによって製造することができる。 The copolymer (A) includes, for example, the monomer (a1), the monomer (a2), the monomer (a3), and if necessary, the other monomer (a4). It can be produced by heating and radical polymerization in an organic solvent and / or water at a temperature of 50 to 140 ° C. in the presence of a polymerization initiator.
前記有機溶剤としては、例えばトルエン、キシレンのような芳香族溶剤；シクロへキサノンのような脂環族溶剤；酢酸ブチル、酢酸エチル等のエステル系溶剤；イソブタノール、ノルマルブタノール、イソプロピルアルコール、ソルビトール、プロピレングリコールモノメチルエーテルアセテート等のセロソルブ；メチルエチルケトン、メチルイソブチルケトン等のケトン等を使用することができる。これらの溶剤は、単独で用いることも２種以上併用することもできる。 Examples of the organic solvent include aromatic solvents such as toluene and xylene; alicyclic solvents such as cyclohexanone; ester solvents such as butyl acetate and ethyl acetate; isobutanol, normal butanol, isopropyl alcohol, sorbitol, Cellosolves such as propylene glycol monomethyl ether acetate; ketones such as methyl ethyl ketone and methyl isobutyl ketone can be used. These solvents can be used alone or in combination of two or more.
前記重合開始剤としては、例えば、２，２’−アゾビス（イソブチロニトリル）、２，２’−アゾビス（２−メチルブチロニトリル）、アゾビスシアノ吉草酸等のアゾ化合物；ｔｅｒｔ−ブチルパーオキシピバレート、ｔｅｒｔ−ブチルパーオキシベンゾエート、ｔｅｒｔ−ブチルパーオキシ−２−エチルヘキサノエート、ジ−ｔｅｒｔ−ブチルパーオキサイド、クメンハイドロパーオキサイド、ベンゾイルパーオキサイド、ｔｅｒｔ−ブチルハイドロパーオキサイド等の有機過酸化物；過酸化水素、過硫酸アンモニウム、過硫酸カリウム、過硫酸ナトリウム等の無機過酸化物などが挙げられる。これらの重合体開始剤は、単独で用いることも２種以上併用することもできる。また、前記重合開始剤は、前記共重合体（Ａ）の原料となる単量体の合計に対して、０．１〜１０質量％の範囲内で使用することが好ましい。 Examples of the polymerization initiator include azo compounds such as 2,2′-azobis (isobutyronitrile), 2,2′-azobis (2-methylbutyronitrile), azobiscyanovaleric acid; tert-butylperoxy Organic peroxides such as pivalate, tert-butylperoxybenzoate, tert-butylperoxy-2-ethylhexanoate, di-tert-butyl peroxide, cumene hydroperoxide, benzoyl peroxide, tert-butyl hydroperoxide Oxides; inorganic peroxides such as hydrogen peroxide, ammonium persulfate, potassium persulfate, sodium persulfate and the like. These polymer initiators can be used alone or in combination of two or more. Moreover, it is preferable to use the said polymerization initiator within the range of 0.1-10 mass% with respect to the sum total of the monomer used as the raw material of the said copolymer (A).
前記水性媒体（Ｂ）としては、水、水と混和する有機溶剤、及び、これらの混合物が挙げられる。水と混和する有機溶剤としては、例えば、メタノール、エタノール、ｎ−プロパノール及びイソプロパノール等のアルコール；アセトン、メチルエチルケトン等のケトン；エチレングリコール、ジエチレングリコール、プロピレングリコール等のポリアルキレングリコール；ポリアルキレングリコールのアルキルエーテル；Ｎ−メチル−２−ピロリドン等のラクタム等が挙げられる。本発明では、水のみを用いても良く、また水及び水と混和する有機溶剤との混合物を用いても良く、水と混和する有機溶剤のみを用いても良い。安全性や環境に対する負荷の点から、水のみ、または、水及び水と混和する有機溶剤との混合物が好ましく、水のみを使用することが特に好ましい。 Examples of the aqueous medium (B) include water, organic solvents miscible with water, and mixtures thereof. Examples of the organic solvent miscible with water include alcohols such as methanol, ethanol, n-propanol and isopropanol; ketones such as acetone and methyl ethyl ketone; polyalkylene glycols such as ethylene glycol, diethylene glycol and propylene glycol; alkyl ethers of polyalkylene glycols And lactams such as N-methyl-2-pyrrolidone. In the present invention, only water may be used, a mixture of water and an organic solvent miscible with water may be used, or only an organic solvent miscible with water may be used. From the viewpoint of safety and load on the environment, water alone or a mixture of water and an organic solvent miscible with water is preferable, and it is particularly preferable to use only water.
本発明のリチウムイオン二次電池耐熱層用水性樹脂組成物は、共重合体（Ａ）、及び、水性媒体（Ｂ）を含有するものであるが、前記方法で得られた共重合体（Ａ）が水性媒体（Ｂ）に溶解または分散したものであることが好ましい。 The aqueous resin composition for a heat-resistant layer of a lithium ion secondary battery of the present invention contains a copolymer (A) and an aqueous medium (B), but the copolymer (A ) Is preferably dissolved or dispersed in the aqueous medium (B).
前記共重合体（Ａ）を水性媒体（Ｂ）に溶解または分散する方法としては、前記共重合体（Ａ）と前記水性媒体（Ｂ）とを混合する方法、前記共重合体（Ａ）を中和したものと前記水性媒体（Ｂ）とを混合する方法等が挙げられる。 Examples of the method for dissolving or dispersing the copolymer (A) in the aqueous medium (B) include a method of mixing the copolymer (A) and the aqueous medium (B), and the copolymer (A). The method etc. which mix the neutralized thing and the said aqueous medium (B) are mentioned.
前記重合体（Ａ）の水性媒体への溶解性及び分散性が良好となることから、前記重合体（Ａ）がカルボキシル基を有する場合は、塩基性化合物により中和することが好ましく、前記重合体（Ａ）がアミノ基を有する場合は、酸性化合物により中和することが好ましい。 When the polymer (A) has a carboxyl group, the polymer (A) is preferably neutralized with a basic compound because the polymer (A) has good solubility and dispersibility in an aqueous medium. When the union (A) has an amino group, it is preferably neutralized with an acidic compound.
前記塩基性化合物としては、例えば、メチルアミン、ジメチルアミン、トリメチルアミン、エチルアミン、ジエチルアミン、トリエチルアミン、２−アミノエタノール、２−ジメチルアミノエタノール等の有機アミン；アンモニア（水）、水酸化ナトリウム、水酸化カリウム等の無機塩基性化合物；テトラメチルアンモニウムハイドロオキサイド、テトラ−ｎ−ブチルアンモニウムハイドロオキサイド、トリメチルベンジルアンモニウムハイドロオキサイドの四級アンモニウムハイドロオキサイドなどが挙げられる。これらの中でも有機アミンおよびアンモニア（水）を使用することが好ましい。なお、これらの塩基性化合物は、単独で用いることも２種以上併用することもできる。 Examples of the basic compound include organic amines such as methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, 2-aminoethanol, 2-dimethylaminoethanol; ammonia (water), sodium hydroxide, potassium hydroxide. Inorganic basic compounds such as tetramethylammonium hydroxide, tetra-n-butylammonium hydroxide, and quaternary ammonium hydroxide of trimethylbenzylammonium hydroxide. Among these, organic amine and ammonia (water) are preferably used. These basic compounds can be used alone or in combination of two or more.
前記酸性化合物としては、例えば、蟻酸、酢酸、プロピオン酸または乳酸等のカルボン酸化合物；燐酸モノメチルエステル、燐酸ジメチルエステル等の燐酸のモノエステルまたはジエステル；メタンスルホン酸、ベンゼンスルホン酸、ドデシルベンゼンスルホン酸等の有機スルホン酸化合物；塩酸、硫酸、硝酸、燐酸等の無機酸などである。これらの中でも、カルボン酸化合物が好ましい。なお、これらの酸性化合物は、単独で用いることも２種以上併用することもできる。 Examples of the acidic compounds include carboxylic acid compounds such as formic acid, acetic acid, propionic acid, and lactic acid; monoesters or diesters of phosphoric acid such as phosphoric acid monomethyl ester and phosphoric acid dimethyl ester; methanesulfonic acid, benzenesulfonic acid, and dodecylbenzenesulfonic acid. Organic sulfonic acid compounds such as inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid. Among these, a carboxylic acid compound is preferable. These acidic compounds can be used alone or in combination of two or more.
また、必要に応じて脱溶剤工程を経ることにより、本発明の水性樹脂組成物中の有機溶剤量を低減することができる。 Moreover, the amount of the organic solvent in the aqueous resin composition of this invention can be reduced by passing through a solvent removal process as needed.
前記方法で得られた本発明の水性樹脂組成物は、塗工作業性がより向上することから、水性樹脂組成物の全量に対して前記共重合体（Ａ）を５〜６０質量％の範囲で含有するものが好ましく、１０〜５０質量％の範囲で含有するものがより好ましい。 Since the aqueous resin composition of the present invention obtained by the above method is improved in coating workability, the copolymer (A) is in the range of 5 to 60% by mass with respect to the total amount of the aqueous resin composition. What is contained is preferable, and what is contained in the range of 10-50 mass% is more preferable.
また、本発明の水性樹脂組成物は、塗工作業性がより向上することから、水性樹脂組成物の全量に対して前記水性媒体（Ｂ）を９５〜４０質量％の範囲で含有するものが好ましく、９０〜５０質量％の範囲で含有するものがより好ましい。 In addition, the aqueous resin composition of the present invention further improves the coating workability, and therefore contains the aqueous medium (B) in the range of 95 to 40% by mass with respect to the total amount of the aqueous resin composition. What contains in the range of 90-50 mass% is more preferable.
本発明の水性樹脂組成物は、必要に応じて、硬化剤、硬化触媒、潤滑剤、充填剤、チキソ付与剤、粘着付与剤、ワックス、熱安定剤、耐光安定剤、蛍光増白剤、発泡剤等の添加剤、ｐＨ調整剤、レベリング剤、ゲル化防止剤、分散安定剤、酸化防止剤、ラジカル捕捉剤、耐熱性付与剤、無機充填剤、有機充填剤、可塑剤、補強剤、触媒、抗菌剤、防カビ剤、防錆剤、熱可塑性樹脂、熱硬化性樹脂、顔料、染料、導電性付与剤、帯電防止剤、透湿性向上剤、撥水剤、撥油剤、中空発泡体、結晶水含有化合物、難燃剤、吸水剤、吸湿剤、消臭剤、整泡剤、消泡剤、防黴剤、防腐剤、防藻剤、顔料分散剤、ブロッキング防止剤、加水分解防止剤、顔料を併用することができる。 The aqueous resin composition of the present invention includes a curing agent, a curing catalyst, a lubricant, a filler, a thixotropic agent, a tackifier, a wax, a heat stabilizer, a light-resistant stabilizer, a fluorescent whitening agent, and a foam as necessary. Additives such as additives, pH adjusters, leveling agents, anti-gelling agents, dispersion stabilizers, antioxidants, radical scavengers, heat resistance imparting agents, inorganic fillers, organic fillers, plasticizers, reinforcing agents, catalysts , Antibacterial agent, antifungal agent, rust preventive agent, thermoplastic resin, thermosetting resin, pigment, dye, conductivity imparting agent, antistatic agent, moisture permeability improver, water repellent, oil repellent, hollow foam, Crystal water-containing compounds, flame retardants, water absorbents, moisture absorbents, deodorants, foam stabilizers, antifoaming agents, antifungal agents, antiseptics, algaeproofing agents, pigment dispersants, antiblocking agents, hydrolysis inhibitors, A pigment can be used in combination.
本発明の水性樹脂組成物は、セパレータへの密着性に優れ、熱収縮率の小さいセパレータが得られることから、リチウムイオン二次電池耐熱層のバインダーとして好適に用いることができる。 The aqueous resin composition of the present invention can be suitably used as a binder for a heat-resistant layer of a lithium ion secondary battery because it has excellent adhesion to the separator and a separator having a small heat shrinkage rate is obtained.
本発明の水性樹脂組成物に無機充填剤を添加することで、優れた耐熱性を有する耐熱層が得られる。 By adding an inorganic filler to the aqueous resin composition of the present invention, a heat resistant layer having excellent heat resistance can be obtained.
前記無機充填剤としては、例えばシリカ、アルミナ、チタニア、ジルコニア、マグネシア、酸化亜鉛、酸化鉄等の酸化物、窒化ケイ素、窒化チタン、窒化ホウ素等の窒化物、シリコンカーバイド、炭酸カルシウム、硫酸マグネシウム、硫酸アルミニウム、水酸化アルミニウム、水酸化酸化アルミニウム、チタン酸カリウム、タルク、カオリナイト、ディカイト、ナクライト、ハロイサイト、パイロフィライト、モンモリロナイト、セリサイト、マイカ、アメサイト、ベントナイト、アスベスト、ゼオライト、ケイ酸カルシウム、ケイ酸マグネシウム、ケイ藻土、ケイ砂、焼成カオリンなどを使用することができる。これらの中でも、焼成カオリンまたはアルミナを使用することが、より一層、耐熱性に優れた耐熱層を形成するうえで好ましい。 Examples of the inorganic filler include silica, alumina, titania, zirconia, magnesia, zinc oxide, iron oxide and other nitrides, silicon nitride, titanium nitride, boron nitride and other nitrides, silicon carbide, calcium carbonate, magnesium sulfate, Aluminum sulfate, aluminum hydroxide, aluminum hydroxide oxide, potassium titanate, talc, kaolinite, dickite, nacrite, halloysite, pyrophyllite, montmorillonite, sericite, mica, amicite, bentonite, asbestos, zeolite, calcium silicate Magnesium silicate, diatomaceous earth, silica sand, calcined kaolin and the like can be used. Among these, it is preferable to use calcined kaolin or alumina in order to form a heat-resistant layer having further excellent heat resistance.
前記無機充填剤と本発明の水性樹脂組成物との固形分質量比が１／１０００〜１／５となる範囲で使用することが、イオンを伝導可能な程度の連通孔を備えたセパレータを形成し、かつ耐熱性に優れたセパレータを形成するうえで好ましい。 Using the inorganic filler and the aqueous resin composition of the present invention in the range where the solid content mass ratio is 1/1000 to 1/5, a separator having a communication hole capable of conducting ions is formed. In addition, it is preferable for forming a separator having excellent heat resistance.
以下に本発明を具体的な実施例を挙げてより詳細に説明する。 Hereinafter, the present invention will be described in more detail with reference to specific examples.
（製造例１：多孔体の製造）
粘度平均分子量（Ｍｖ）７０万であるポリエチレン４７質量部と、粘度平均分子量（Ｍｖ）２５万であるポリエチレン４６質量部と、粘度平均分子量（Ｍｖ）４０万であるポリプロピレン７質量部とを、タブラーブレンダーを用いてドライブレンドし混合物（１）を得た。得られた混合物（１）と、酸化防止剤としてペンタエリスリチル−テトラキス−［３−（３，５−ジ−ｔ−ブチル−４−ヒドロキシフェニル）プロピオネート］を１質量％とを混合し、再度タンブラーブレンダーを用いてドライブレンドすることで混合物（２）を得た。得られた混合物（２）を含む容器内を窒素で置換した後、それを窒素雰囲気下で、フィーダーを介して二軸押出機に供給した。また、可塑剤として流動パラフィン（３７．７８℃における動粘度７．５９×１０−５ｍ２／ｓ）を、前記二軸押出機のシリンダーのプランジャーポンプを用い、前記フィーダーから供給された混合物（２）に注入した。それらを、設定温度２００℃、スクリュー回転数２４０ｒｐｍ、吐出量１２ｋｇ／ｈの条件で溶融混練し、押出しを行った。なお、可塑剤の使用量は、前記二軸押出機を用いて押し出された溶融混練物の全量に対して、前記可塑剤が６５質量％存在するよう調整した。次いで、前記二軸押出機を用いて押し出された溶融混練物を、Ｔダイを経て表面温度２５℃に制御された冷却ロール上に押出しキャストすることにより、ポリオレフィン組成物からなる厚さ２０００μｍのシート状物を得た。次に、前記シート状物を、同時二軸テンター延伸機へ導き、ＭＤ方向に７倍、ＴＤ方向に７倍に同時二軸延伸することによって、延伸シート状物を得た。この時、同時二軸テンターの設定温度は１２５℃であった。次に、前記延伸シート状物をメチルエチルケトン槽に導き、前記延伸シート状物に含まれる流動パラフィンを抽出除去した後、メチルエチルケトンを乾燥除去することによって、多孔シートを得た。次に、前記多孔シートをＴＤテンター熱固定機に導き、熱固定を行った。熱固定温度は１３３℃、ＴＤ緩和率０．８０とした。その結果、厚さ１６μｍ、縦５０ｃｍ及び横５０ｃｍで、気孔率４０％、透気度１６０秒／１００ｃｃである多孔体を得た。(Production Example 1: Production of porous body)
47 parts by mass of polyethylene having a viscosity average molecular weight (Mv) of 700,000, 46 parts by mass of polyethylene having a viscosity average molecular weight (Mv) of 250,000, and 7 parts by mass of polypropylene having a viscosity average molecular weight (Mv) of 400,000 Dry blending was performed using a blender to obtain a mixture (1). The obtained mixture (1) was mixed with 1% by mass of pentaerythrityl-tetrakis- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] as an antioxidant, and again The mixture (2) was obtained by dry blending using a tumbler blender. After the inside of the container containing the obtained mixture (2) was replaced with nitrogen, it was supplied to a twin-screw extruder through a feeder under a nitrogen atmosphere. Also, liquid paraffin (kinematic viscosity at 37.78 ° C .: 7.59 × 10 −5 m 2 / s) as a plasticizer and a mixture supplied from the feeder using a plunger pump of a cylinder of the twin-screw extruder Injected into (2). They were melt kneaded and extruded under the conditions of a preset temperature of 200 ° C., a screw rotation speed of 240 rpm, and a discharge rate of 12 kg / h. In addition, the usage-amount of the plasticizer was adjusted so that the said plasticizer might exist 65 mass% with respect to the whole quantity of the melt-kneaded material extruded using the said twin-screw extruder. Next, the melt-kneaded product extruded using the twin-screw extruder is extruded and cast onto a cooling roll controlled at a surface temperature of 25 ° C. through a T-die, thereby forming a sheet having a thickness of 2000 μm made of a polyolefin composition. A product was obtained. Next, the sheet-like product was guided to a simultaneous biaxial tenter stretching machine, and stretched simultaneously 7-times in the MD direction and 7-fold in the TD direction to obtain a stretched sheet-like material. At this time, the setting temperature of the simultaneous biaxial tenter was 125 ° C. Next, the stretched sheet-like material was introduced into a methyl ethyl ketone tank, and liquid paraffin contained in the stretched sheet-like material was extracted and removed, and then methyl ethyl ketone was removed by drying to obtain a porous sheet. Next, the porous sheet was guided to a TD tenter heat fixing machine and heat fixed. The heat setting temperature was 133 ° C. and the TD relaxation rate was 0.80. As a result, a porous body having a thickness of 16 μm, a length of 50 cm and a width of 50 cm, a porosity of 40%, and an air permeability of 160 seconds / 100 cc was obtained.
（実施例１：リチウムイオン二次電池耐熱層用水性樹脂組成物（１）の合成及び評価）
攪拌機、温度計および冷却器を取り付けた２Ｌの反応容器中に、イソプロピルアルコール（以下、「ＩＰＡ」と略記する。）１００質量部を仕込み８０℃まで加熱し、これに２−ヒドロキシエチルメタクリレート（以下、「ＨＥＭＡ」と略記する。）７５質量部、ビニルトリエトキシシラン（以下、「ＶＴＥＳ」と略記する。）５質量部、メトキシポリエチレングリコールメタクリレート（新中村化学株式会社製、「ＮＫエステルＭ−２３０Ｇ」）２０質量部、及び２，２−アゾビス（２−メチルブチロニトリル）（和光純薬株式会社製、「Ｖ−５９」）０．５質量部の混合物を約３時間かけて滴下し、重合した。次いで、反応容器の温度を５０℃に下げ、純水５００質量部を約１５分間かけて徐々に添加し、水溶化を行った。反応容器内の温度を５０℃に保ち、アスピレーターでフラスコ内を減圧しながらＩＰＡを除去（脱溶剤）した。脱溶剤後、反応容器を冷却し、純水を添加することで、不揮発分２５重量％のリチウムイオン二次電池耐熱層用水性樹脂組成物（１）を得た。この水性樹脂組成物（１）中の重合体の水酸基価は３２４であり、自己縮合性官能基濃度は０．７９ｍｍｏｌ／ｇであった。(Example 1: Synthesis and evaluation of aqueous resin composition (1) for heat-resistant layer of lithium ion secondary battery)
In a 2 L reaction vessel equipped with a stirrer, a thermometer and a condenser, 100 parts by mass of isopropyl alcohol (hereinafter abbreviated as “IPA”) was charged and heated to 80 ° C. , Abbreviated as “HEMA”) 75 parts by mass, vinyl triethoxysilane (hereinafter abbreviated as “VTES”) 5 parts by mass, methoxypolyethylene glycol methacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., “NK ester M-230G”) ") 20 parts by mass and a mixture of 2,2-azobis (2-methylbutyronitrile) (Wako Pure Chemical Industries, Ltd.," V-59 ") 0.5 parts by mass was added dropwise over about 3 hours, Polymerized. Next, the temperature of the reaction vessel was lowered to 50 ° C., and 500 parts by mass of pure water was gradually added over about 15 minutes to effect water solubilization. The temperature in the reaction vessel was kept at 50 ° C., and IPA was removed (solvent removal) while reducing the pressure in the flask with an aspirator. After removing the solvent, the reaction vessel was cooled and pure water was added to obtain an aqueous resin composition (1) for a heat-resistant layer of a lithium ion secondary battery having a nonvolatile content of 25% by weight. The hydroxyl value of the polymer in this aqueous resin composition (1) was 324, and the self-condensable functional group concentration was 0.79 mmol / g.
［耐熱層形成用スラリーの調製］
上記で得たリチウムイオン二次電池耐熱層用水性樹脂組成物（１）４質量部、焼成カオリン（カオリナイトを主成分とする湿式カリオンを高温処理したもの）９９質量部、及び純水１００質量部を混合し、焼成カオリンを均一に分散させることよって耐熱層形成用スラリー（１）を得た。[Preparation of slurry for heat-resistant layer formation]
4 parts by mass of the aqueous resin composition (1) for lithium ion secondary battery heat-resistant layer obtained above, 99 parts by mass of calcined kaolin (wet-treated kaolinite as a main component, wet kalion), and 100 parts by mass of pure water Parts were mixed and the calcined kaolin was uniformly dispersed to obtain a heat-resistant layer forming slurry (1).
［リチウムイオン二次電池用セパレータの作成］
耐熱層形成用スラリー（１）を、製造例１で得た多孔体の表面にマイクログラビアコーターを用いて塗布した。次に、塗布面を６０℃で乾燥し、水を除去することによって、厚さ１μｍの耐熱層（１）を備えたリチウムイオン二次電池用セパレータ（１）を得た。[Preparation of separator for lithium ion secondary battery]
The slurry (1) for heat-resistant layer formation was apply | coated to the surface of the porous body obtained by manufacture example 1 using the micro gravure coater. Next, the coated surface was dried at 60 ° C., and water was removed to obtain a lithium ion secondary battery separator (1) having a heat-resistant layer (1) having a thickness of 1 μm.
［密着性の評価］
上記で得たセパレータ（１）を用い、ＪＩＳ Ｋ５６００−５−６のクロスカット法に基づいて評価した。耐熱層（１）の上にカッターで１ｍｍ幅の切込みを入れ碁盤目の数を１００個とし、全ての碁盤目を覆うようにセロハンテープを貼り付け、すばやく引き剥がして付着して残っている碁盤目の数から、下記の基準により密着性を評価した。
◎：９５〜１００個
○：８５〜９４個
△：６５〜８４個
×：６４個以下[Evaluation of adhesion]
The separator (1) obtained above was used and evaluated based on the cross-cut method of JIS K5600-5-6. A 1mm wide cut is made on the heat-resistant layer (1) with a cutter, the number of grids is 100, cellophane tape is pasted so as to cover all grids, and the board is left by peeling off quickly. From the number of eyes, adhesion was evaluated according to the following criteria.
◎: 95-100 pieces ○: 85-94 pieces △: 65-84 pieces x: 64 pieces or less
［耐熱性の評価］
上記で得たセパレータ（１）の表面の面積を測定した。次いで、前記セパレータ（１）を、乾熱オーブンを用いて２００℃で３０分間加熱した。加熱終了後、前記セパレータ（１）を室温まで冷却し、その面積を測定した。加熱前後のセパレータの面積と、下記計算式に基づいて、面積収縮率を算出し、下記の基準により耐熱性を評価した。
面積収縮率（％）＝［１−〔（加熱後のセパレータの面積）／（加熱前のセパレータの面積）〕］×１００
◎：面積収縮率が５％未満
○：面積収縮率が５％以上１０％未満
△：面積収縮率が１０％以上１５％未満
×：面積収縮率が１５％以上[Evaluation of heat resistance]
The surface area of the separator (1) obtained above was measured. Next, the separator (1) was heated at 200 ° C. for 30 minutes using a dry heat oven. After the heating, the separator (1) was cooled to room temperature and the area was measured. The area shrinkage was calculated based on the area of the separator before and after heating and the following calculation formula, and the heat resistance was evaluated according to the following criteria.
Area shrinkage rate (%) = [1-[(area of separator after heating) / (area of separator before heating)]] × 100
◎: Area shrinkage rate is less than 5% ○: Area shrinkage rate is 5% or more and less than 10% Δ: Area shrinkage rate is 10% or more and less than 15% ×: Area shrinkage rate is 15% or more
（実施例２：リチウムイオン二次電池耐熱層用水性樹脂組成物（２）の合成及び評価）
攪拌機、温度計および冷却器を取り付けた２Ｌの反応容器中に、ＩＰＡ １００質量部を仕込み８０℃まで加熱し、これにＨＥＭＡ ４０質量部、ＶＴＥＳ ５質量部、メトキシポリエチレングリコールメタクリレート（新中村化学株式会社製、「ＮＫエステルＭ−２３０Ｇ」）２０質量部、ブチルアクリレート（以下、「ＢＡ」と略記する。）３５質量部、及び２，２−アゾビス（２−メチルブチロニトリル）（和光純薬株式会社製、「Ｖ−５９」）０．５質量部の混合物を約３時間かけて滴下し、重合した。次いで、反応容器の温度を５０℃に下げ、純水５００質量部を約１５分間かけて徐々に添加し、水溶化を行った。反応容器内の温度を５０℃に保ち、アスピレーターでフラスコ内を減圧しながらＩＰＡを除去（脱溶剤）した。脱溶剤後、反応容器を冷却し、純水を添加することで、不揮発分２５重量％のリチウムイオン二次電池耐熱層用水性樹脂組成物（２）を得た。この水性樹脂組成物（２）中の重合体の水酸基価は１７３であり、自己縮合性官能基濃度は０．７９ｍｍｏｌ／ｇであった。(Example 2: Synthesis and evaluation of aqueous resin composition (2) for heat-resistant layer of lithium ion secondary battery)
In a 2 L reaction vessel equipped with a stirrer, a thermometer and a condenser, 100 parts by mass of IPA were charged and heated to 80 ° C., and 40 parts by mass of HEMA, 5 parts by mass of VTES, methoxypolyethylene glycol methacrylate (Shin Nakamura Chemical Co., Ltd.) 20 parts by mass, “NK Ester M-230G”), 35 parts by mass of butyl acrylate (hereinafter abbreviated as “BA”), and 2,2-azobis (2-methylbutyronitrile) (Wako Pure Chemical Industries, Ltd.) Co., Ltd., “V-59”) 0.5 parts by mass of the mixture was dropped over about 3 hours and polymerized. Next, the temperature of the reaction vessel was lowered to 50 ° C., and 500 parts by mass of pure water was gradually added over about 15 minutes to effect water solubilization. The temperature in the reaction vessel was kept at 50 ° C., and IPA was removed (solvent removal) while reducing the pressure in the flask with an aspirator. After removing the solvent, the reaction vessel was cooled and pure water was added to obtain an aqueous resin composition (2) for a heat-resistant layer of a lithium ion secondary battery having a nonvolatile content of 25% by weight. The hydroxyl value of the polymer in this aqueous resin composition (2) was 173, and the self-condensable functional group concentration was 0.79 mmol / g.
実施例１で用いたリチウムイオン二次電池耐熱層用水性樹脂組成物（１）をリチウムイオン二次電池耐熱層用水性樹脂組成物（２）に変更した以外は、実施例１と同様に操作することにより、耐熱層（２）を備えたリチウムイオン二次電池用セパレータ（２）を作成し、密着性及び耐熱性を評価した。 The same operation as in Example 1 except that the aqueous resin composition (1) for the heat-resistant layer of the lithium ion secondary battery used in Example 1 was changed to the aqueous resin composition (2) for the heat-resistant layer of the lithium ion secondary battery. As a result, a separator (2) for a lithium ion secondary battery provided with a heat-resistant layer (2) was prepared, and adhesion and heat resistance were evaluated.
（実施例３：リチウムイオン二次電池耐熱層用水性樹脂組成物（３）の合成及び評価）
攪拌機、温度計および冷却器を取り付けた２Ｌの反応容器中に、ＩＰＡ １００質量部を仕込み８０℃まで加熱し、これにＨＥＭＡ ７５質量部、ＶＴＥＳ ５質量部、メトキシポリエチレングリコールメタクリレート（新中村化学株式会社製、「ＮＫエステルＭ−２３０Ｇ」）２０質量部、及び２，２−アゾビス（２−メチルブチロニトリル）（和光純薬株式会社製、「Ｖ−５９」）０．５質量部の混合物を約３時間かけて滴下し、重合した。次いで、反応容器の温度を５０℃に下げ、純水５００質量部を約１５分間かけて徐々に添加し、水溶化を行った。反応容器内の温度を５０℃に保ち、アスピレーターでフラスコ内を減圧しながらＩＰＡを除去（脱溶剤）した。脱溶剤後、反応容器を冷却し、純水を添加することで、不揮発分２５重量％のリチウムイオン二次電池耐熱層用水性樹脂組成物（３）を得た。この水性樹脂組成物（３）中の重合体の水酸基価は３６３であり、自己縮合性官能基濃度は０．７９ｍｍｏｌ／ｇであった。(Example 3: Synthesis and evaluation of aqueous resin composition (3) for heat-resistant layer of lithium ion secondary battery)
In a 2 L reaction vessel equipped with a stirrer, a thermometer and a condenser, 100 parts by mass of IPA was charged and heated to 80 ° C., and 75 parts by mass of HEMA, 5 parts by mass of VTES, methoxypolyethylene glycol methacrylate (Shin Nakamura Chemical Co. 20 parts by mass of “NK ester M-230G” manufactured by the company and 0.5 parts by mass of 2,2-azobis (2-methylbutyronitrile) (manufactured by Wako Pure Chemical Industries, Ltd., “V-59”) Was added dropwise over about 3 hours to polymerize. Next, the temperature of the reaction vessel was lowered to 50 ° C., and 500 parts by mass of pure water was gradually added over about 15 minutes to effect water solubilization. The temperature in the reaction vessel was kept at 50 ° C., and IPA was removed (solvent removal) while reducing the pressure in the flask with an aspirator. After removing the solvent, the reaction vessel was cooled and pure water was added to obtain an aqueous resin composition (3) for a lithium ion secondary battery heat-resistant layer having a nonvolatile content of 25% by weight. The hydroxyl value of the polymer in this aqueous resin composition (3) was 363, and the self-condensable functional group concentration was 0.79 mmol / g.
実施例１で用いたリチウムイオン二次電池耐熱層用水性樹脂組成物（１）をリチウムイオン二次電池耐熱層用水性樹脂組成物（３）に変更した以外は、実施例１と同様に操作することにより、耐熱層（３）を備えたリチウムイオン二次電池用セパレータ（３）を作成し、密着性及び耐熱性を評価した。 The same operation as in Example 1 was conducted except that the aqueous resin composition for a heat-resistant layer of lithium ion secondary battery (1) used in Example 1 was changed to the aqueous resin composition for a heat-resistant layer of lithium ion secondary battery (3). By doing this, the separator (3) for lithium ion secondary batteries provided with the heat resistant layer (3) was created, and adhesiveness and heat resistance were evaluated.
（実施例４：リチウムイオン二次電池耐熱層用水性樹脂組成物（４）の合成及び評価）
攪拌機、温度計および冷却器を取り付けた２Ｌの反応容器中に、ＩＰＡ １００質量部を仕込み８０℃まで加熱し、これにＨＥＭＡ ４０質量部、Ｎ−ブトキシメチルアクリルアミド ５質量部、メトキシポリエチレングリコールメタクリレート（新中村化学株式会社製、「ＮＫエステルＭ−２３０Ｇ」）２０質量部、ブチルアクリレート（以下、「ＢＡ」と略記する。）３５質量部、及び２，２−アゾビス（２−メチルブチロニトリル）（和光純薬株式会社製、「Ｖ−５９」）０．５質量部の混合物を約３時間かけて滴下し、重合した。次いで、反応容器の温度を５０℃に下げ、純水５００質量部を約１５分間かけて徐々に添加し、水溶化を行った。反応容器内の温度を５０℃に保ち、アスピレーターでフラスコ内を減圧しながらＩＰＡを除去（脱溶剤）した。脱溶剤後、反応容器を冷却し、純水を添加することで、不揮発分２５重量％のリチウムイオン二次電池耐熱層用水性樹脂組成物（２）を得た。この水性樹脂組成物（２）中の重合体の水酸基価は３２４であり、自己縮合性官能基濃度は０．３２ｍｍｏｌ／ｇであった。(Example 4: Synthesis and evaluation of aqueous resin composition (4) for heat-resistant layer of lithium ion secondary battery)
In a 2 L reaction vessel equipped with a stirrer, a thermometer and a condenser, 100 parts by mass of IPA were charged and heated to 80 ° C., and 40 parts by mass of HEMA, 5 parts by mass of N-butoxymethylacrylamide, methoxypolyethylene glycol methacrylate ( Shin-Nakamura Chemical Co., Ltd. “NK ester M-230G”) 20 parts by mass, butyl acrylate (hereinafter abbreviated as “BA”) 35 parts by mass, and 2,2-azobis (2-methylbutyronitrile) (Wako Pure Chemical Industries, Ltd., "V-59") 0.5 parts by mass of the mixture was dropped over about 3 hours and polymerized. Next, the temperature of the reaction vessel was lowered to 50 ° C., and 500 parts by mass of pure water was gradually added over about 15 minutes to effect water solubilization. The temperature in the reaction vessel was kept at 50 ° C., and IPA was removed (solvent removal) while reducing the pressure in the flask with an aspirator. After removing the solvent, the reaction vessel was cooled and pure water was added to obtain an aqueous resin composition (2) for a heat-resistant layer of a lithium ion secondary battery having a nonvolatile content of 25% by weight. The hydroxyl value of the polymer in this aqueous resin composition (2) was 324, and the self-condensable functional group concentration was 0.32 mmol / g.
実施例１で用いたリチウムイオン二次電池耐熱層用水性樹脂組成物（１）をリチウムイオン二次電池耐熱層用水性樹脂組成物（４）に変更した以外は、実施例１と同様に操作することにより、耐熱層（４）を備えたリチウムイオン二次電池用セパレータ（４）を作成し、密着性及び耐熱性を評価した。 The same operation as in Example 1 except that the aqueous resin composition (1) for the heat-resistant layer of the lithium ion secondary battery used in Example 1 was changed to the aqueous resin composition (4) for the heat-resistant layer of the lithium ion secondary battery. By doing this, a separator (4) for a lithium ion secondary battery provided with a heat resistant layer (4) was prepared, and the adhesion and heat resistance were evaluated.
（実施例５：リチウムイオン二次電池耐熱層用水性樹脂組成物（５）の合成及び評価）
攪拌機、温度計および冷却器を取り付けた２Ｌの反応容器中に、ＩＰＡ １００質量部を仕込み８０℃まで加熱し、これにＨＥＭＡ ４０質量部、Ｎ−ヒドロキシメチルアクリルアミド ５質量部、メトキシポリエチレングリコールメタクリレート（新中村化学株式会社製、「ＮＫエステルＭ−２３０Ｇ」）２０質量部、ブチルアクリレート（以下、「ＢＡ」と略記する。）３５質量部、及び２，２−アゾビス（２−メチルブチロニトリル）（和光純薬株式会社製、「Ｖ−５９」）０．５質量部の混合物を約３時間かけて滴下し、重合した。次いで、反応容器の温度を５０℃に下げ、純水５００質量部を約１５分間かけて徐々に添加し、水溶化を行った。反応容器内の温度を５０℃に保ち、アスピレーターでフラスコ内を減圧しながらＩＰＡを除去（脱溶剤）した。脱溶剤後、反応容器を冷却し、純水を添加することで、不揮発分２５重量％のリチウムイオン二次電池耐熱層用水性樹脂組成物（２）を得た。この水性樹脂組成物（２）中の重合体の水酸基価は３２４であり、自己縮合性官能基濃度は０．４９ｍｍｏｌ／ｇであった。(Example 5: Synthesis and evaluation of aqueous resin composition (5) for heat-resistant layer of lithium ion secondary battery)
In a 2 L reaction vessel equipped with a stirrer, a thermometer and a condenser, 100 parts by mass of IPA was charged and heated to 80 ° C., and 40 parts by mass of HEMA, 5 parts by mass of N-hydroxymethylacrylamide, methoxypolyethylene glycol methacrylate ( Shin-Nakamura Chemical Co., Ltd. “NK ester M-230G”) 20 parts by mass, butyl acrylate (hereinafter abbreviated as “BA”) 35 parts by mass, and 2,2-azobis (2-methylbutyronitrile) (Wako Pure Chemical Industries, Ltd., "V-59") 0.5 parts by mass of the mixture was dropped over about 3 hours and polymerized. Next, the temperature of the reaction vessel was lowered to 50 ° C., and 500 parts by mass of pure water was gradually added over about 15 minutes to effect water solubilization. The temperature in the reaction vessel was kept at 50 ° C., and IPA was removed (solvent removal) while reducing the pressure in the flask with an aspirator. After removing the solvent, the reaction vessel was cooled and pure water was added to obtain an aqueous resin composition (2) for a heat-resistant layer of a lithium ion secondary battery having a nonvolatile content of 25% by weight. The hydroxyl value of the polymer in this aqueous resin composition (2) was 324, and the self-condensable functional group concentration was 0.49 mmol / g.
実施例１で用いたリチウムイオン二次電池耐熱層用水性樹脂組成物（１）をリチウムイオン二次電池耐熱層用水性樹脂組成物（５）に変更した以外は、実施例１と同様に操作することにより、耐熱層（５）を備えたリチウムイオン二次電池用セパレータ（５）を作成し、密着性及び耐熱性を評価した。 The same operation as in Example 1 except that the aqueous resin composition (1) for a heat resistant layer of a lithium ion secondary battery used in Example 1 was changed to the aqueous resin composition (5) for a heat resistant layer of a lithium ion secondary battery. As a result, a separator (5) for a lithium ion secondary battery provided with a heat-resistant layer (5) was prepared and evaluated for adhesion and heat resistance.
（比較例１：リチウムイオン二次電池耐熱層用水性樹脂組成物（Ｒ１）の合成及び評価）
攪拌機、温度計および冷却器を取り付けた２Ｌの反応容器中に、ＩＰＡ １００質量部を仕込み８０℃まで加熱し、これにＨＥＭＡ ２５質量部、ＶＴＥＳ ５質量部、メトキシポリエチレングリコールメタクリレート（新中村化学株式会社製、「ＮＫエステルＭ−２３０Ｇ」）２０質量部、ＢＡ ５０質量部、及び２，２−アゾビス（２−メチルブチロニトリル）（和光純薬株式会社製、「Ｖ−５９」）０．５質量部の混合物を約３時間かけて滴下し、重合した。次いで、反応容器の温度を５０℃に下げ、純水５００質量部を約１５分間かけて徐々に添加し、水溶化を行った。反応容器内の温度を５０℃に保ち、アスピレーターでフラスコ内を減圧しながらＩＰＡを除去（脱溶剤）した。脱溶剤後、反応容器を冷却し、純水を添加することで、不揮発分２５重量％のリチウムイオン二次電池耐熱層用水性樹脂組成物（Ｒ１）を得た。この水性樹脂組成物（Ｒ１）中の重合体の水酸基価は８６であり、自己縮合性官能基濃度は０．７９ｍｍｏｌ／ｇであった。(Comparative Example 1: Synthesis and evaluation of aqueous resin composition (R1) for heat-resistant layer of lithium ion secondary battery)
In a 2 L reaction vessel equipped with a stirrer, a thermometer and a condenser, 100 parts by mass of IPA was charged and heated to 80 ° C., and 25 parts by mass of HEMA, 5 parts by mass of VTES, methoxypolyethylene glycol methacrylate (Shin Nakamura Chemical Co., Ltd.) 20 parts by mass, “NK ester M-230G”), 50 parts by mass of BA, and 2,2-azobis (2-methylbutyronitrile) (Wako Pure Chemical Industries, “V-59”) 5 parts by mass of the mixture was dropped over about 3 hours and polymerized. Next, the temperature of the reaction vessel was lowered to 50 ° C., and 500 parts by mass of pure water was gradually added over about 15 minutes to effect water solubilization. The temperature in the reaction vessel was kept at 50 ° C., and IPA was removed (solvent removal) while reducing the pressure in the flask with an aspirator. After removing the solvent, the reaction vessel was cooled and pure water was added to obtain an aqueous resin composition (R1) for a lithium ion secondary battery heat-resistant layer having a nonvolatile content of 25% by weight. The hydroxyl value of the polymer in this aqueous resin composition (R1) was 86, and the self-condensable functional group concentration was 0.79 mmol / g.
実施例１で用いたリチウムイオン二次電池耐熱層用水性樹脂組成物（１）をリチウムイオン二次電池耐熱層用水性樹脂組成物（Ｒ１）に変更した以外は、実施例１と同様に操作することにより、耐熱層（Ｒ１）を備えたリチウムイオン二次電池用セパレータ（Ｒ１）を作成し、密着性及び耐熱性を評価した。 The same operation as in Example 1 except that the aqueous resin composition (1) for the heat-resistant layer of the lithium ion secondary battery used in Example 1 was changed to the aqueous resin composition (R1) for the heat-resistant layer of the lithium ion secondary battery. Thus, a lithium ion secondary battery separator (R1) provided with a heat-resistant layer (R1) was prepared, and adhesion and heat resistance were evaluated.
（比較例２：リチウムイオン二次電池耐熱層用水性樹脂組成物（Ｒ２）の合成及び評価）
攪拌機、温度計および冷却器を取り付けた２Ｌの反応容器中に、ＩＰＡ １００質量部を仕込み８０℃まで加熱し、これにＨＥＭＡ ７５質量部、ＶＴＥＳ ０．２５質量部、メトキシポリエチレングリコールメタクリレート（新中村化学株式会社製、「ＮＫエステルＭ−２３０Ｇ」）１０質量部、ＢＡ １４．７５質量部、及び２，２−アゾビス（２−メチルブチロニトリル）（和光純薬株式会社製、「Ｖ−５９」）０．３質量部の混合物を約３時間かけて滴下し、重合した。次いで、反応容器の温度を５０℃に下げ、純水５００質量部を約１５分間かけて徐々に添加し、水溶化を行った。反応容器内の温度を５０℃に保ち、アスピレーターでフラスコ内を減圧しながらＩＰＡを除去（脱溶剤）した。脱溶剤後、反応容器を冷却し、純水を添加することで、不揮発分２５重量％のリチウムイオン二次電池耐熱層用水性樹脂組成物（Ｒ２）を得た。この水性樹脂組成物（Ｒ２）中の重合体の水酸基価は３２４であり、自己縮合性官能基濃度は０．０４ｍｍｏｌ／ｇであった。(Comparative Example 2: Synthesis and evaluation of aqueous resin composition (R2) for heat-resistant layer of lithium ion secondary battery)
In a 2 L reaction vessel equipped with a stirrer, a thermometer and a condenser, 100 parts by mass of IPA was charged and heated to 80 ° C., and 75 parts by mass of HEMA, 0.25 parts by mass of VTES, methoxypolyethylene glycol methacrylate (Shin Nakamura) Chemical Co., Ltd., “NK Ester M-230G”) 10 parts by mass, BA 14.75 parts by mass, and 2,2-azobis (2-methylbutyronitrile) (Wako Pure Chemical Industries, Ltd., “V-59” ]) 0.3 parts by mass of the mixture was added dropwise over about 3 hours and polymerized. Next, the temperature of the reaction vessel was lowered to 50 ° C., and 500 parts by mass of pure water was gradually added over about 15 minutes to effect water solubilization. The temperature in the reaction vessel was kept at 50 ° C., and IPA was removed (solvent removal) while reducing the pressure in the flask with an aspirator. After removing the solvent, the reaction vessel was cooled and pure water was added to obtain an aqueous resin composition (R2) for a lithium ion secondary battery heat-resistant layer having a nonvolatile content of 25% by weight. The hydroxyl value of the polymer in this aqueous resin composition (R2) was 324, and the self-condensable functional group concentration was 0.04 mmol / g.
実施例１で用いたリチウムイオン二次電池耐熱層用水性樹脂組成物（１）をリチウムイオン二次電池耐熱層用水性樹脂組成物（Ｒ２）に変更した以外は、実施例１と同様に操作することにより、耐熱層（Ｒ２）を備えたリチウムイオン二次電池用セパレータ（Ｒ２）を作成し、密着性及び耐熱性を評価した。 The same operation as in Example 1 except that the aqueous resin composition (1) for the heat-resistant layer of the lithium ion secondary battery used in Example 1 was changed to the aqueous resin composition (R2) for the heat-resistant layer of the lithium ion secondary battery. Thus, a lithium ion secondary battery separator (R2) provided with a heat-resistant layer (R2) was prepared and evaluated for adhesion and heat resistance.
上記の実施例１〜３及び比較例１〜２の評価結果を表１に示す。 The evaluation results of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1.
本発明の水性樹脂組成物である実施例１〜５のものから得られる耐熱層は、密着性及び耐熱性に優れることが確認された。 It was confirmed that the heat-resistant layer obtained from Examples 1 to 5 which are the aqueous resin composition of the present invention is excellent in adhesion and heat resistance.
一方、比較例１は、水性樹脂組成物に含有される共重合体の水酸基価が、下限である１００より小さいものを用いた例であるが、得られる耐熱層の密着性及び耐熱性が劣ることが確認された。 On the other hand, Comparative Example 1 is an example in which the hydroxyl value of the copolymer contained in the aqueous resin composition is smaller than the lower limit of 100, but the heat resistance layer obtained has poor adhesion and heat resistance. It was confirmed.
また、比較例２は、水性樹脂組成物に含有される共重合体の自己縮合性官能基濃度が、下限である０．１ｍｍｏｌ／ｇより小さいものを用いた例であるが、得られる耐熱層の密着性及び耐熱性が劣ることが確認された。 Comparative Example 2 is an example in which the concentration of the self-condensable functional group of the copolymer contained in the aqueous resin composition is smaller than the lower limit of 0.1 mmol / g, but the resulting heat resistant layer It was confirmed that the adhesiveness and heat resistance of the resin were inferior.
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