JP2022114551A - (Meth)acrylic acid copolymer - Google Patents
(Meth)acrylic acid copolymer Download PDFInfo
- Publication number
- JP2022114551A JP2022114551A JP2021010853A JP2021010853A JP2022114551A JP 2022114551 A JP2022114551 A JP 2022114551A JP 2021010853 A JP2021010853 A JP 2021010853A JP 2021010853 A JP2021010853 A JP 2021010853A JP 2022114551 A JP2022114551 A JP 2022114551A
- Authority
- JP
- Japan
- Prior art keywords
- salt
- meth
- group
- acrylic acid
- sulfonic acid
- 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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- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229920002126 Acrylic acid copolymer Polymers 0.000 title claims abstract 4
- 150000003839 salts Chemical class 0.000 claims abstract description 90
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229920001577 copolymer Polymers 0.000 claims abstract description 64
- 239000000178 monomer Substances 0.000 claims abstract description 60
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 46
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000002455 scale inhibitor Substances 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 20
- 125000004429 atom Chemical group 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 abstract 1
- 230000003449 preventive effect Effects 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 description 41
- 239000000243 solution Substances 0.000 description 27
- 238000006116 polymerization reaction Methods 0.000 description 22
- -1 alkali metal salts Chemical class 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 16
- 239000007864 aqueous solution Substances 0.000 description 15
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 14
- 238000003756 stirring Methods 0.000 description 13
- 125000000542 sulfonic acid group Chemical group 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 12
- 238000003786 synthesis reaction Methods 0.000 description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- 238000010992 reflux Methods 0.000 description 10
- 229940048053 acrylate Drugs 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 8
- 239000002253 acid Substances 0.000 description 8
- 230000005764 inhibitory process Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 6
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical group C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 6
- 239000012986 chain transfer agent Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 159000000000 sodium salts Chemical class 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 description 4
- 239000003505 polymerization initiator Substances 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 239000000872 buffer Substances 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- UZKWTJUDCOPSNM-UHFFFAOYSA-N 1-ethenoxybutane Chemical compound CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 2
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 2
- PMNLUUOXGOOLSP-UHFFFAOYSA-N 2-mercaptopropanoic acid Chemical compound CC(S)C(O)=O PMNLUUOXGOOLSP-UHFFFAOYSA-N 0.000 description 2
- VVJKKWFAADXIJK-UHFFFAOYSA-N Allylamine Chemical compound NCC=C VVJKKWFAADXIJK-UHFFFAOYSA-N 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- DIKBFYAXUHHXCS-UHFFFAOYSA-N bromoform Chemical compound BrC(Br)Br DIKBFYAXUHHXCS-UHFFFAOYSA-N 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 2
- 239000013000 chemical inhibitor Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- XQRLCLUYWUNEEH-UHFFFAOYSA-N diphosphonic acid Chemical compound OP(=O)OP(O)=O XQRLCLUYWUNEEH-UHFFFAOYSA-N 0.000 description 2
- FJKIXWOMBXYWOQ-UHFFFAOYSA-N ethenoxyethane Chemical compound CCOC=C FJKIXWOMBXYWOQ-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- CPJRRXSHAYUTGL-UHFFFAOYSA-N isopentenyl alcohol Chemical compound CC(=C)CCO CPJRRXSHAYUTGL-UHFFFAOYSA-N 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 2
- 159000000001 potassium salts Chemical class 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 description 1
- OSSNTDFYBPYIEC-UHFFFAOYSA-N 1-ethenylimidazole Chemical group C=CN1C=CN=C1 OSSNTDFYBPYIEC-UHFFFAOYSA-N 0.000 description 1
- GUKBBOQRGNHBRK-UHFFFAOYSA-N 1-ethoxy-3-methylbuta-1,3-diene Chemical compound CCOC=CC(C)=C GUKBBOQRGNHBRK-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 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
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 1
- PFHOSZAOXCYAGJ-UHFFFAOYSA-N 2-[(2-cyano-4-methoxy-4-methylpentan-2-yl)diazenyl]-4-methoxy-2,4-dimethylpentanenitrile Chemical compound COC(C)(C)CC(C)(C#N)N=NC(C)(C#N)CC(C)(C)OC PFHOSZAOXCYAGJ-UHFFFAOYSA-N 0.000 description 1
- WYGWHHGCAGTUCH-UHFFFAOYSA-N 2-[(2-cyano-4-methylpentan-2-yl)diazenyl]-2,4-dimethylpentanenitrile Chemical compound CC(C)CC(C)(C#N)N=NC(C)(C#N)CC(C)C WYGWHHGCAGTUCH-UHFFFAOYSA-N 0.000 description 1
- DNYWXJPIRSNXIP-UHFFFAOYSA-N 2-bromo-1,1,1-trichloroethane Chemical compound ClC(Cl)(Cl)CBr DNYWXJPIRSNXIP-UHFFFAOYSA-N 0.000 description 1
- 229940006193 2-mercaptoethanesulfonic acid Drugs 0.000 description 1
- CYZYBHBEBHVRMJ-UHFFFAOYSA-N 2-methylprop-2-enoxymethylbenzene Chemical compound CC(=C)COCC1=CC=CC=C1 CYZYBHBEBHVRMJ-UHFFFAOYSA-N 0.000 description 1
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 1
- BTYIFQSAIPDZQW-UHFFFAOYSA-N 2-propan-2-yl-4,5-dihydro-1h-imidazole Chemical compound CC(C)C1=NCCN1 BTYIFQSAIPDZQW-UHFFFAOYSA-N 0.000 description 1
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical group C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 1
- ZAWQXWZJKKICSZ-UHFFFAOYSA-N 3,3-dimethyl-2-methylidenebutanamide Chemical compound CC(C)(C)C(=C)C(N)=O ZAWQXWZJKKICSZ-UHFFFAOYSA-N 0.000 description 1
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 description 1
- UFQHFMGRRVQFNA-UHFFFAOYSA-N 3-(dimethylamino)propyl prop-2-enoate Chemical compound CN(C)CCCOC(=O)C=C UFQHFMGRRVQFNA-UHFFFAOYSA-N 0.000 description 1
- NMZSJIQGMAGSSO-UHFFFAOYSA-N 3-[[1-amino-2-[[1-amino-1-(2-carboxyethylimino)-2-methylpropan-2-yl]diazenyl]-2-methylpropylidene]amino]propanoic acid Chemical compound OC(=O)CCNC(=N)C(C)(C)N=NC(C)(C)C(=N)NCCC(O)=O NMZSJIQGMAGSSO-UHFFFAOYSA-N 0.000 description 1
- XHULUQRDNLRXPF-UHFFFAOYSA-N 3-ethenyl-1,3-oxazolidin-2-id-4-one Chemical compound C(=C)N1[CH-]OCC1=O XHULUQRDNLRXPF-UHFFFAOYSA-N 0.000 description 1
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 description 1
- DHNFGUDLVOSIKJ-UHFFFAOYSA-N 3-methyl-1-(3-methylbuta-1,3-dienoxy)buta-1,3-diene Chemical class CC(=C)C=COC=CC(C)=C DHNFGUDLVOSIKJ-UHFFFAOYSA-N 0.000 description 1
- VFXXTYGQYWRHJP-UHFFFAOYSA-N 4,4'-azobis(4-cyanopentanoic acid) Chemical compound OC(=O)CCC(C)(C#N)N=NC(C)(CCC(O)=O)C#N VFXXTYGQYWRHJP-UHFFFAOYSA-N 0.000 description 1
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 1
- ZWAPMFBHEQZLGK-UHFFFAOYSA-N 5-(dimethylamino)-2-methylidenepentanamide Chemical compound CN(C)CCCC(=C)C(N)=O ZWAPMFBHEQZLGK-UHFFFAOYSA-N 0.000 description 1
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- MNMAPDKOEXSCME-UHFFFAOYSA-N C(CCC)OC=CC(C)=C Chemical compound C(CCC)OC=CC(C)=C MNMAPDKOEXSCME-UHFFFAOYSA-N 0.000 description 1
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical class CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical class NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical class CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- LXEKPEMOWBOYRF-UHFFFAOYSA-N [2-[(1-azaniumyl-1-imino-2-methylpropan-2-yl)diazenyl]-2-methylpropanimidoyl]azanium;dichloride Chemical compound Cl.Cl.NC(=N)C(C)(C)N=NC(C)(C)C(N)=N LXEKPEMOWBOYRF-UHFFFAOYSA-N 0.000 description 1
- KYIKRXIYLAGAKQ-UHFFFAOYSA-N abcn Chemical compound C1CCCCC1(C#N)N=NC1(C#N)CCCCC1 KYIKRXIYLAGAKQ-UHFFFAOYSA-N 0.000 description 1
- 238000002479 acid--base titration Methods 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 125000006615 aromatic heterocyclic group Chemical group 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- LBSPZZSGTIBOFG-UHFFFAOYSA-N bis[2-(4,5-dihydro-1h-imidazol-2-yl)propan-2-yl]diazene;dihydrochloride Chemical compound Cl.Cl.N=1CCNC=1C(C)(C)N=NC(C)(C)C1=NCCN1 LBSPZZSGTIBOFG-UHFFFAOYSA-N 0.000 description 1
- 229950005228 bromoform Drugs 0.000 description 1
- SKGVGRLWZVRZDC-UHFFFAOYSA-N butyl 2-sulfanylacetate Chemical compound CCCCOC(=O)CS SKGVGRLWZVRZDC-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical group 0.000 description 1
- ZNEWHQLOPFWXOF-UHFFFAOYSA-N coenzyme M Chemical compound OS(=O)(=O)CCS ZNEWHQLOPFWXOF-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 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
- 125000004985 dialkyl amino alkyl group Chemical group 0.000 description 1
- 150000005332 diethylamines Chemical class 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
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- 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
- 239000003480 eluent Substances 0.000 description 1
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- 239000000706 filtrate Substances 0.000 description 1
- 238000009292 forward osmosis Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
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- 125000003827 glycol group Chemical group 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
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- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical group C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 1
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- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- KQNPFQTWMSNSAP-UHFFFAOYSA-N isobutyric acid Chemical compound CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-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
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- 229940088644 n,n-dimethylacrylamide Drugs 0.000 description 1
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- QYZFTMMPKCOTAN-UHFFFAOYSA-N n-[2-(2-hydroxyethylamino)ethyl]-2-[[1-[2-(2-hydroxyethylamino)ethylamino]-2-methyl-1-oxopropan-2-yl]diazenyl]-2-methylpropanamide Chemical compound OCCNCCNC(=O)C(C)(C)N=NC(C)(C)C(=O)NCCNCCO QYZFTMMPKCOTAN-UHFFFAOYSA-N 0.000 description 1
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- ZQXSMRAEXCEDJD-UHFFFAOYSA-N n-ethenylformamide Chemical compound C=CNC=O ZQXSMRAEXCEDJD-UHFFFAOYSA-N 0.000 description 1
- RCLLINSDAJVOHP-UHFFFAOYSA-N n-ethyl-n',n'-dimethylprop-2-enehydrazide Chemical compound CCN(N(C)C)C(=O)C=C RCLLINSDAJVOHP-UHFFFAOYSA-N 0.000 description 1
- LRSCEVQEEBMAHN-UHFFFAOYSA-N n-methylbut-3-enamide Chemical compound CNC(=O)CC=C LRSCEVQEEBMAHN-UHFFFAOYSA-N 0.000 description 1
- DYUWTXWIYMHBQS-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine Chemical compound C=CCNCC=C DYUWTXWIYMHBQS-UHFFFAOYSA-N 0.000 description 1
- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 description 1
- KZCOBXFFBQJQHH-UHFFFAOYSA-N octane-1-thiol Chemical compound CCCCCCCCS KZCOBXFFBQJQHH-UHFFFAOYSA-N 0.000 description 1
- MADOXCFISYCULS-UHFFFAOYSA-N octyl 2-sulfanylacetate Chemical compound CCCCCCCCOC(=O)CS MADOXCFISYCULS-UHFFFAOYSA-N 0.000 description 1
- LWNSNYBMYBWJDN-UHFFFAOYSA-N octyl 3-sulfanylpropanoate Chemical compound CCCCCCCCOC(=O)CCS LWNSNYBMYBWJDN-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- DJEHXEMURTVAOE-UHFFFAOYSA-M potassium bisulfite Chemical compound [K+].OS([O-])=O DJEHXEMURTVAOE-UHFFFAOYSA-M 0.000 description 1
- 229940099427 potassium bisulfite Drugs 0.000 description 1
- LYZXDRIYOSVZCW-UHFFFAOYSA-M potassium dioxidophosphanium Chemical compound [K+].[O-][PH2]=O LYZXDRIYOSVZCW-UHFFFAOYSA-M 0.000 description 1
- 235000010259 potassium hydrogen sulphite Nutrition 0.000 description 1
- RWPGFSMJFRPDDP-UHFFFAOYSA-L potassium metabisulfite Chemical compound [K+].[K+].[O-]S(=O)S([O-])(=O)=O RWPGFSMJFRPDDP-UHFFFAOYSA-L 0.000 description 1
- 229940043349 potassium metabisulfite Drugs 0.000 description 1
- 235000010263 potassium metabisulphite Nutrition 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
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- UIIIBRHUICCMAI-UHFFFAOYSA-N prop-2-ene-1-sulfonic acid Chemical compound OS(=O)(=O)CC=C UIIIBRHUICCMAI-UHFFFAOYSA-N 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003333 secondary alcohols Chemical class 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- 229940001607 sodium bisulfite Drugs 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 229940001584 sodium metabisulfite Drugs 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 description 1
- CJGJYOBXQLCLRG-UHFFFAOYSA-M sodium;2-hydroxy-3-prop-2-enoxypropane-1-sulfonate Chemical compound [Na+].[O-]S(=O)(=O)CC(O)COCC=C CJGJYOBXQLCLRG-UHFFFAOYSA-M 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 1
- 229940035024 thioglycerol Drugs 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- NJRXVEJTAYWCQJ-UHFFFAOYSA-N thiomalic acid Chemical compound OC(=O)CC(S)C(O)=O NJRXVEJTAYWCQJ-UHFFFAOYSA-N 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
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical class C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
本発明は、(メタ)アクリル酸系共重合体に関する。より詳しくは、シリカスケールなどのスケールの抑制に用いられる(メタ)アクリル酸系共重合体に関する。 The present invention relates to a (meth)acrylic acid-based copolymer. More particularly, it relates to a (meth)acrylic acid-based copolymer used for suppressing scale such as silica scale.
例えば、地熱発電や、工業用冷却水、海水の淡水処理化等において、炭酸カルシウムやシリカなどのスケールの発生が問題になる。
例えば特許文献1に記載のスルホン酸基含有単量体由来の構造単位が2モル%以上、9モル%以下であり、(メタ)アクリル酸(塩)由来の構造単位が91モル%以上98モル%以下であり、少なくとも一つの主鎖末端にスルホン酸(塩)基を有し重量平均分子量が7000から100000である共重合体はカルシウムイオン補足能、炭酸カルシウム分散性に優れ、炭酸カルシウムスケール防止剤として好適に用いることが出来ることが開示されている。
例えば、特許文献2に記載のスルホン酸基含有単量体由来の構造単位が5モル%以上、22モル%以下であり、(メタ)アクリル酸(塩)由来の構造単位が78モル%以上95モル%以下であり、少なくとも一つの主鎖末端にスルホン酸(塩)基を有し重量平均分子量が13000から50000である共重合体は耐ゲル性優れ、高いカルシウムイオンのキレート能を有することから、スケール防止剤などの水処理剤として好適に用いることが出来ることが開示されている。
例えば、特許文献3に記載のスルホン酸基含有単量体由来の構造単位が16モル%以上、24モル%以下であり、(メタ)アクリル酸(塩)由来の構造単位が76モル%以上84モル%以下であり、を含み、少なくとも一つの主鎖末端にスルホン酸(塩)基を有し重量平均分子量が1000から18000である共重合体は耐ゲル性優れ、高いカルシウムイオンのキレート能を有することから、スケール防止剤などの水処理剤として好適に用いることが出来ることが開示されている。
例えば、特許文献4に記載の共重合体は、疎水粒子の分散性を向上させ、また、カルシウムイオンへの優れたキレート能を発揮するため、地熱発電装置の配管や装置内部に対して極めて良好なスケール防止能を発揮することが可能となることから、地熱発電装置用スケール防止剤として好適に用いることができることが開示されている。
For example, in geothermal power generation, industrial cooling water, desalination of seawater, and the like, generation of scale such as calcium carbonate and silica poses a problem.
For example, the structural unit derived from the sulfonic acid group-containing monomer described in Patent Document 1 is 2 mol% or more and 9 mol% or less, and the structural unit derived from (meth)acrylic acid (salt) is 91 mol% or more and 98 mol. % or less, and having a sulfonic acid (salt) group at at least one main chain end and a weight average molecular weight of 7,000 to 100,000, is excellent in calcium ion-capturing ability, calcium carbonate dispersibility, and prevents calcium carbonate scale. It is disclosed that it can be suitably used as an agent.
For example, the structural unit derived from the sulfonic acid group-containing monomer described in Patent Document 2 is 5 mol% or more and 22 mol% or less, and the structural unit derived from (meth)acrylic acid (salt) is 78 mol% or more and 95 mol % or less, and having a sulfonic acid (salt) group at at least one main chain end and a weight average molecular weight of 13,000 to 50,000 has excellent gel resistance and high calcium ion chelating ability. , and that it can be suitably used as a water treatment agent such as a scale inhibitor.
For example, the structural unit derived from the sulfonic acid group-containing monomer described in Patent Document 3 is 16 mol% or more and 24 mol% or less, and the structural unit derived from (meth)acrylic acid (salt) is 76 mol% or more 84 A copolymer having a sulfonic acid (salt) group at at least one main chain end and a weight average molecular weight of 1000 to 18000 has excellent gel resistance and high calcium ion chelating ability. Since it has, it is disclosed that it can be suitably used as a water treatment agent such as a scale inhibitor.
For example, the copolymer described in Patent Document 4 improves the dispersibility of hydrophobic particles and exhibits excellent chelating ability to calcium ions, so it is extremely good for the piping and inside of the geothermal power generation device. It is disclosed that it can be suitably used as an anti-scaling agent for geothermal power generation equipment because it is possible to exhibit a high anti-scaling ability.
上記のとおりスケール防止剤などの水処理剤が提案されているが、シリカスケールの抑制能をさらに向上させる要望があり、また、入手が容易である汎用の単量体を用いて製造する重合体による、様々な水処理用途でのシリカスケール防止に適用可能であるシリカスケール防止剤が望まれていた。本発明は、シリカスケールの抑制能に優れることから、例えばシリカスケールの防止剤として好適に使用することが可能な(メタ)アクリル酸系共重合体を提供することを目的とする。 As described above, water treatment agents such as scale inhibitors have been proposed, but there is a demand for further improving the ability to suppress silica scale, and polymers produced using easily available general-purpose monomers. Therefore, there has been a desire for a silica scale inhibitor that can be applied to prevent silica scale in various water treatment applications. An object of the present invention is to provide a (meth)acrylic acid-based copolymer that can be suitably used, for example, as a silica scale inhibitor because of its excellent ability to suppress silica scale.
本発明者は、上記目的を達成する為に種々検討を行ない、本発明に想到した。
すなわち本開示の(メタ)アクリル酸系共重合体は、(メタ)アクリル酸(塩)由来の構造単位と、スルホン酸(塩)基含有単量体由来の構造単位とを含む共重合体であり、全単量体由来の構造100モル%に対してスルホン酸(塩)基含有単量体が13モル%以上であり、該共重合体の重量平均分子量が28000以上、56000以下であり、共重合体の少なくとも一つの主鎖末端がスルホン酸(塩)基である。
In order to achieve the above object, the inventor conducted various studies and came up with the present invention.
That is, the (meth)acrylic acid-based copolymer of the present disclosure is a copolymer containing a structural unit derived from (meth)acrylic acid (salt) and a structural unit derived from a sulfonic acid (salt) group-containing monomer. is, the sulfonic acid (salt) group-containing monomer is 13 mol% or more with respect to 100 mol% of the structure derived from all the monomers, and the weight average molecular weight of the copolymer is 28000 or more and 56000 or less, At least one main chain end of the copolymer is a sulfonic acid (salt) group.
本開示の(メタ)アクリル酸系共重合体は、シリカ成分などのスケール析出に対し、良好な抑制能を発現する。よって、本開示の(メタ)アクリル酸系共重合体は、シリカスケールなどのスケール抑制に用いる水処理剤や、スケール防止剤として好ましく使用することができる。 The (meth)acrylic acid-based copolymer of the present disclosure expresses good ability to suppress scale deposition of silica components and the like. Therefore, the (meth)acrylic acid-based copolymer of the present disclosure can be preferably used as a water treatment agent for suppressing scale such as silica scale and as a scale inhibitor.
以下、本発明を詳細に説明する。
なお、以下において記載する本発明の個々の好ましい形態を2つ以上組み合わせたものもまた、本発明の好ましい形態である。
The present invention will be described in detail below.
A combination of two or more of the individual preferred embodiments of the invention described below is also a preferred embodiment of the invention.
[本開示の(メタ)アクリル酸系共重合体]
本開示の(メタ)アクリル酸系共重合体は、(メタ)アクリル酸(塩)由来の構造単位と、スルホン酸(塩)基含有単量体由来の構造単位含み、全単量体由来の構造100モル%に対してスルホン酸(塩)基含有単量体が13モル%以上であり、該共重合体の重量平均分子量が28000以上、56000以下であり、共重合体の少なくとも一つの主鎖末端がスルホン酸(塩)基である。なお、上記共重合体を、本開示の共重合体と呼ぶことがある。
[(Meth)acrylic acid-based copolymer of the present disclosure]
The (meth)acrylic acid-based copolymer of the present disclosure includes a structural unit derived from (meth)acrylic acid (salt) and a structural unit derived from a sulfonic acid (salt) group-containing monomer, and is derived from all monomers. The sulfonic acid (salt) group-containing monomer is 13 mol% or more based on 100 mol% of the structure, the weight average molecular weight of the copolymer is 28000 or more and 56000 or less, and at least one main component of the copolymer The chain ends are sulfonic acid (salt) groups. In addition, the said copolymer may be called the copolymer of this indication.
<(メタ)アクリル酸(塩)由来の構造単位>
本開示において、(メタ)アクリル酸とは、アクリル酸、メタクリル酸、およびそれらの塩をいう。
上記塩としては、特に制限はないが、アルカリ金属塩、アルカリ土類金属塩、遷移金属塩、アンモニウム塩などが例示される。
本開示において、(メタ)アクリル酸(塩)由来の構造単位とは、(メタ)アクリル酸(塩)の炭素炭素二重結合が炭素炭素単結合に置き換わった構造単位を表す。例えば、アクリル酸、CH2=CH(COOH)、であれば、アクリル酸由来の構造単位は、-CH2-CH(COOH)-、で表すことができる。(メタ)アクリル酸(塩)由来の構造単位は、例えば、(メタ)アクリル酸(塩)をラジカル重合することにより形成することができる。なお、(メタ)アクリル酸(塩)由来の構造単位は、(メタ)アクリル酸(塩)の炭素炭素二重結合が炭素炭素単結合に置き換わった構造と同じ構造であればよく、(メタ)アクリル酸(塩)が重合することにより形成された構造単位に限定されず、例えば重合後の後反応により形成された構造単位であってもよい。
<Structural unit derived from (meth)acrylic acid (salt)>
In the present disclosure, (meth)acrylic acid refers to acrylic acid, methacrylic acid, and salts thereof.
Examples of the salt include, but are not limited to, alkali metal salts, alkaline earth metal salts, transition metal salts, and ammonium salts.
In the present disclosure, a structural unit derived from (meth)acrylic acid (salt) represents a structural unit in which the carbon-carbon double bond of (meth)acrylic acid (salt) is replaced with a carbon-carbon single bond. For example, in the case of acrylic acid, CH 2 =CH(COOH), the structural unit derived from acrylic acid can be represented by -CH 2 -CH(COOH)-. A structural unit derived from (meth)acrylic acid (salt) can be formed, for example, by radical polymerization of (meth)acrylic acid (salt). The structural unit derived from (meth)acrylic acid (salt) may have the same structure as the structure in which the carbon-carbon double bond of (meth)acrylic acid (salt) is replaced with a carbon-carbon single bond. It is not limited to structural units formed by polymerization of acrylic acid (salt), and may be structural units formed by post-reaction after polymerization, for example.
本開示の共重合体における、(メタ)アクリル酸(塩)由来の構造単位の含有量は、本開示の共重合体を構成するすべての単量体に由来する構造単位100モル%に対し、好ましくは50モル%以上、より好ましくは60モル%以上、さらに好ましくは70モル%以上である。また、好ましくは87モル%以下、より好ましくは86モル%以下、さらに好ましくは82モル%以下である。なお、上記(メタ)アクリル酸(塩)由来の構造単位の含有量は、(メタ)アクリル酸換算で算出する。(メタ)アクリル酸換算とは、(メタ)アクリル酸(塩)由来の構造単位が(メタ)アクリル酸塩由来の構造単位である場合でも、(メタ)アクリル酸として質量計算することをいう。上記範囲であることにより、本開示の水処理薬剤あるいはスケール防止剤のシリカスケール抑制能が向上する傾向にある。 The content of structural units derived from (meth)acrylic acid (salt) in the copolymer of the present disclosure is based on 100 mol% of structural units derived from all monomers constituting the copolymer of the present disclosure, It is preferably 50 mol % or more, more preferably 60 mol % or more, still more preferably 70 mol % or more. Also, it is preferably 87 mol % or less, more preferably 86 mol % or less, and still more preferably 82 mol % or less. The content of structural units derived from (meth)acrylic acid (salt) is calculated in terms of (meth)acrylic acid. (Meth)acrylic acid conversion refers to mass calculation as (meth)acrylic acid even when a structural unit derived from (meth)acrylic acid (salt) is a structural unit derived from (meth)acrylate. Within the above range, the water treatment agent or scale inhibitor of the present disclosure tends to have an improved ability to suppress silica scale.
<スルホン酸(塩)基含有単量体由来の構造単位>
本開示において、スルホン酸(塩)基含有単量体とは、少なくとも1つの炭素炭素二重結合と、スルホン酸(塩)基とを含む化合物をいう。上記少なくとも1つの炭素炭素二重結合は、通常はラジカル重合性を有する。
上記塩としては、特に制限はないが、アルカリ金属塩、アルカリ土類金属塩、遷移金属塩、アンモニウム塩などが例示される。
本開示において、スルホン酸(塩)基含有単量体由来の構造単位とは、スルホン酸(塩)基含有単量体の少なくとも一つの炭素炭素二重結合が炭素炭素単結合に置き換わった構造単位を表す。なお、スルホン酸(塩)基含有単量体由来の構造単位は、スルホン酸(塩)基含有単量体の少なくとも1つの炭素炭素二重結合が炭素炭素単結合に置き換わった構造と同じ構造であればよく、スルホン酸(塩)基含有単量体が重合することにより形成された構造単位に限定されず、例えば重合後の後反応により形成された構造単位であってもよい。
スルホン酸(塩)基含有単量体としては、例えば、ビニルスルホン酸及びその塩、スチレンスルホン酸及びその塩、(メタ)アリルスルホン酸及びその塩、3-(メタ)アリルオキシ-2-ヒドロキシプロパンスルホン酸及びその塩、3-(メタ)アリルオキシ-1-ヒドロキシプロパンスルホン酸及びその塩、2-(メタ)アリルオキシエチレンスルホン酸及びその塩、2-アクリルアミド-2-メチルプロパンスルホン酸及びその塩等が挙げられる。
<Structural unit derived from sulfonic acid (salt) group-containing monomer>
In the present disclosure, a sulfonic acid (salt) group-containing monomer refers to a compound containing at least one carbon-carbon double bond and a sulfonic acid (salt) group. The at least one carbon-carbon double bond is usually radically polymerizable.
Examples of the salt include, but are not limited to, alkali metal salts, alkaline earth metal salts, transition metal salts, and ammonium salts.
In the present disclosure, a structural unit derived from a sulfonic acid (salt) group-containing monomer is a structural unit in which at least one carbon-carbon double bond of the sulfonic acid (salt) group-containing monomer is replaced with a carbon-carbon single bond. represents The structural unit derived from the sulfonic acid (salt) group-containing monomer has the same structure as the structure in which at least one carbon-carbon double bond of the sulfonic acid (salt) group-containing monomer is replaced with a carbon-carbon single bond. It is not limited to a structural unit formed by polymerization of a sulfonic acid (salt) group-containing monomer, and may be, for example, a structural unit formed by a post-reaction after polymerization.
Examples of sulfonic acid (salt) group-containing monomers include vinylsulfonic acid and its salts, styrenesulfonic acid and its salts, (meth)allylsulfonic acid and its salts, and 3-(meth)allyloxy-2-hydroxypropane. Sulfonic acid and its salts, 3-(meth)allyloxy-1-hydroxypropanesulfonic acid and its salts, 2-(meth)allyloxyethylenesulfonic acid and its salts, 2-acrylamido-2-methylpropanesulfonic acid and its salts etc.
例えば、スルホン酸(塩)基含有単量体由来の構造単位は下記一般式(1)で表される。
(一般式(1)中、R1は、水素原子またはメチル基を表し、XおよびYは、それぞれ独立に水酸基またはスルホン酸(塩)基を表す(但し、X、Yのうち少なくとも一方はスルホン酸(塩)基を表す。スルホン酸(塩)とは、スルホン酸、スルホン酸塩をいう。スルホン酸塩における塩とは、金属塩、アンモニウム塩、有機アミン塩である。具体的には、ナトリウム塩、リチウム塩、カリウム塩等のアルカリ金属塩;マグネシウム塩、カルシウム塩等のアルカリ土類金属塩;鉄の塩等の遷移金属塩;モノエタノールアミン塩、ジエタノールアミン塩、トリエタノールアミン塩等のアルカノールアミン塩;モノエチルアミン塩、ジエチルアミン塩、トリエチルアミン塩等のアルキルアミン塩;エチレンジアミン塩、トリエチレンジアミン塩等のポリアミン等の有機アミンの塩;等が挙げられる。この中でもナトリウム塩、カリウム塩が特に好ましい。アスタリスクは、一般式(1)で表される構造単位が結合している同種もしくは異種の他の構造単位に含まれる原子を表す。)上記アスタリスクが表す原子が含まれる構造単位としては、特に制限はないが、単量体由来の構造単位、開始剤由来の構造単位、連鎖移動剤に由来する構造単位等が例示される。
本開示の水処理薬剤あるいはスケール防止剤のスケール抑制能が向上する傾向にあることから、3-(メタ)アリルオキシ-2-ヒドロキシプロパンスルホン酸及びその塩であることが好ましく、より好ましくは、3-アリルオキシ-2-ヒドロキシプロパンスルホン酸及びそのナトリウム塩である
For example, a structural unit derived from a sulfonic acid (salt) group-containing monomer is represented by the following general formula (1).
(In general formula (1), R 1 represents a hydrogen atom or a methyl group, and X and Y each independently represent a hydroxyl group or a sulfonic acid (salt) group (provided that at least one of X and Y is a sulfone Represents an acid (salt) group.Sulfonic acid (salt) refers to sulfonic acid and sulfonate.Salts in sulfonate include metal salts, ammonium salts, and organic amine salts.Specifically, alkali metal salts such as sodium salts, lithium salts and potassium salts; alkaline earth metal salts such as magnesium salts and calcium salts; transition metal salts such as iron salts; Alkanolamine salts, alkylamine salts such as monoethylamine salts, diethylamine salts and triethylamine salts, organic amine salts such as polyamines such as ethylenediamine salts and triethylenediamine salts, etc. Of these, sodium salts and potassium salts are particularly preferred. The asterisk represents an atom contained in another structural unit of the same or different type to which the structural unit represented by the general formula (1) is bonded.) As the structural unit containing the atom represented by the above asterisk, Examples include, but are not limited to, monomer-derived structural units, initiator-derived structural units, and chain transfer agent-derived structural units.
3-(meth)allyloxy-2-hydroxypropanesulfonic acid and salts thereof are preferable, and more preferably 3 - allyloxy-2-hydroxypropanesulfonic acid and its sodium salt
本開示の共重合体における、スルホン酸(塩)基含有単量体由来の構造単位の含有量は、本開示の共重合体を構成するすべての単量体に由来する構造単位100質量%に対し、13モル%以上、好ましくは14モル%以上、より好ましくは14.5モル%以上である。また、好ましくは40モル%以下、より好ましくは30モル%以下、さらに好ましくは25モル%以下であるである。なお、上記スルホン酸(塩)基含有単量体由来の構造単位の含有量は、ナトリウム塩換算で算出する。上記ナトリウム塩換算で算出するとは、スルホン酸(塩)基含有単量体由来の構造単位に含まれるスルホン酸(塩)基が例えば酸型のスルホン酸基である場合でも、スルホン酸基のナトリウム塩であるとして計算することをいう。上記範囲であることにより、本開示の水処理薬剤あるいはスケール防止剤のシリカスケール抑制能が向上する傾向にある。 In the copolymer of the present disclosure, the content of structural units derived from sulfonic acid (salt) group-containing monomers is 100% by mass of structural units derived from all monomers constituting the copolymer of the present disclosure. On the other hand, it is 13 mol % or more, preferably 14 mol % or more, more preferably 14.5 mol % or more. Also, it is preferably 40 mol % or less, more preferably 30 mol % or less, and still more preferably 25 mol % or less. The content of structural units derived from the sulfonic acid (salt) group-containing monomer is calculated in terms of sodium salt. Calculating in terms of sodium salt means that even if the sulfonic acid (salt) group contained in the structural unit derived from the sulfonic acid (salt) group-containing monomer is, for example, an acid-type sulfonic acid group, the sodium of the sulfonic acid group It means to calculate as if it is salt. Within the above range, the water treatment agent or scale inhibitor of the present disclosure tends to have an improved ability to suppress silica scale.
<その他の単量体由来の構造単位>
本開示の共重合体は、所望に応じて、(メタ)アクリル酸(塩)由来の構造単位、スルホン酸(塩)基含有単量体由来の構造単位以外の単量体に由来する構造単位(その他の単量体に由来する構造単位ともいう)を有していてもよい。
本開示において、その他の単量由来の構造単位とはその他の有単量の少なくとも一つの炭素炭素二重結合が炭素炭素単結合に置き換わった構造単位を表す。なお、その他の単量体由来の構造単位は、その他の単量体の少なくとも1つの炭素炭素二重結合が炭素炭素単結合に置き換わった構造と同じ構造であればよく、その他の単量体が重合することにより形成された構造単位に限定されず、例えば重合後の後反応により形成された構造単位であってもよい。
本開示の共重合体における、その他の単量体に由来する構造単位の含有量は、本開示の共重合体を構成するすべての単量体に由来する構造単位100モル%に対し、0モル%以上、15モル%以下、好ましくは0モル%以上、10モル%以下、より好ましくは0モル%以上、5モル%以下であり、さらに好ましくは0モル%以上、3モル%以下であり、特に好ましくは0モル%以上、2モル%以下であり、最も好ましくは0モル%である。
<Structural units derived from other monomers>
The copolymer of the present disclosure, if desired, a structural unit derived from a (meth)acrylic acid (salt)-derived structural unit, a structural unit derived from a monomer other than a sulfonic acid (salt) group-containing monomer (also referred to as structural units derived from other monomers).
In the present disclosure, structural units derived from other monomers represent structural units in which at least one carbon-carbon double bond of another monomer is replaced with a carbon-carbon single bond. In addition, the structural unit derived from other monomers may have the same structure as the structure in which at least one carbon-carbon double bond of the other monomer is replaced with a carbon-carbon single bond. The structural units are not limited to those formed by polymerization, and may be, for example, structural units formed by post-reaction after polymerization.
In the copolymer of the present disclosure, the content of structural units derived from other monomers is 0 mol with respect to 100 mol% of structural units derived from all monomers constituting the copolymer of the present disclosure. % or more and 15 mol% or less, preferably 0 mol% or more and 10 mol% or less, more preferably 0 mol% or more and 5 mol% or less, still more preferably 0 mol% or more and 3 mol% or less, It is particularly preferably 0 mol % or more and 2 mol % or less, and most preferably 0 mol %.
前記その他の単量体としては、マレイン酸、イタコン酸、及びこれらの塩等のカルボキシル基含有単量体;(メタ)アリルアルコール、イソプレノール等の不飽和アルコール及びこれらにアルキレンオキサイドを付加した単量体、アルコキシアルキレングリコールの(メタ)アクリル酸エステル等のポリアルキレングリコール鎖含有単量体;ビニルピリジン、ビニルイミダゾール等の複素環式芳香族炭化水素基を有するビニル芳香族系単量体;ジメチルアミノエチルアクリレート、ジメチルアミノエチルメタクリレート、ジメチルアミノプロピルアクリレート等のジアルキルアミノアルキル(メタ)アクリレート、ジメチルアミノエチルアクリルアミド、ジメチルアミノエチルメタクリルアミド、ジメチルアミノプロピルアクリルアミド等のジアルキルアミノアルキル(メタ)アクリルアミド、ジアリルアミン、ジアリルジメチルアミン等のジアリルアルキルアミン等のアリルアミン等のアミノ基含有単量体及びこれらの四級化物;N-ビニルピロリドン、N-ビニルホルムアミド、N-ビニルアセトアミド、N-ビニル-N-メチルホルムアミド、N-ビニル-N-メチルアセトアミド、N-ビニルオキサゾリドン等のN-ビニル単量体;(メタ)アクリルアミド、N,N-ジメチルアクリルアミド、N-イソプロピルアクリルアミド、t-ブチルアクリルアミド等のアミド系単量体;(メタ)アリルアルコール、イソプレノール等の水酸基含有単量体;ブチル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、ドデシル(メタ)アクリレート等の(メタ)アクリル酸アルキルエステル系単量体;2-ヒドロキシエチル(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-ヒドロキシブチル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、2-ヒドロキシヘキシル(メタ)アクリレート等の(メタ)アクリル酸ヒドロキシアルキル系単量体;スチレン、インデン、ビニルアニリン等のビニルアリール単量体;イソブチレン、酢酸ビニル等;エーテル結合含有単量体としては、エチルビニルエーテル、ブチルビニルエーテル、ベンジルビニルエーテル等のビニルエーテル;エチルメタリルエーテル、ブチルメタリルエーテル、ベンジルメタリルエーテル等の(メタ)アリルエーテル;エチルイソプレニルエーテル、ブチルイソプレニルエーテル、ベンジルイソプレニルエーテル等のイソプレニルエーテル等が挙げられる。 Examples of the other monomers include carboxyl group-containing monomers such as maleic acid, itaconic acid, and salts thereof; unsaturated alcohols such as (meth)allyl alcohol and isoprenol; and monomers obtained by adding alkylene oxide thereto. polyalkylene glycol chain-containing monomers such as (meth)acrylic acid esters of alkoxyalkylene glycols; vinyl aromatic monomers having heterocyclic aromatic hydrocarbon groups such as vinylpyridine and vinylimidazole; dimethylamino Dialkylaminoalkyl (meth)acrylates such as ethyl acrylate, dimethylaminoethyl methacrylate and dimethylaminopropyl acrylate, dialkylaminoalkyl (meth)acrylamides such as dimethylaminoethylacrylamide, dimethylaminoethyl methacrylamide and dimethylaminopropylacrylamide, diallylamine, diallyl Amino group-containing monomers such as allylamine such as diallylalkylamine such as dimethylamine, and quaternized products thereof; N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide, N-vinyl-N-methylformamide, N -N-vinyl monomers such as vinyl-N-methylacetamide and N-vinyloxazolidone; (meth)acrylamide, N,N-dimethylacrylamide, N-isopropylacrylamide, amide monomers such as t-butylacrylamide; (Meth) allyl alcohol, hydroxyl group-containing monomers such as isoprenol; butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, dodecyl (meth) acrylate, etc. (meth) acrylic acid alkyl ester monomers; 2- Hydroxy (meth)acrylates such as hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 2-hydroxyhexyl (meth)acrylate Alkyl-based monomers; vinylaryl monomers such as styrene, indene and vinylaniline; isobutylene, vinyl acetate and the like; ether bond-containing monomers such as vinyl ethers such as ethyl vinyl ether, butyl vinyl ether and benzyl vinyl ether; , butyl methallyl ether, benzyl methallyl ether, and other (meth)allyl ethers; ethyl isoprenyl ether, butyl isoprenyl ether, benzyl iso Examples include isoprenyl ethers such as prenyl ethers.
<その他の構造単位>
本開示の共重合体は、重合体の主鎖の少なくとも一つの末端にスルホン酸(塩)基を有することを特徴としている。重合体の主鎖の少なくとも一つの末端にスルホン酸(塩)基を有するとは、1又は2以上の主鎖末端にスルホン酸(塩)基を有することをいう。例えば直鎖状の重合体であれば、主鎖末端が2か所存在し、そのうちの1つ又は両方にスルホン酸基を有していてもよく、例えば分岐構造を持つ重合体であれば3以上の主鎖末端が存在し、そのうちの1つ又は2つ以上にスルホン酸基を有していても良い。少なくとも一つの鎖末端にスルホ酸(塩)基を有することにより、シリカスケール抑制能が向上する共重合体100質量%に対する、共重合体の主鎖末端のスルホン酸基の質量%が0.01%以上、10%以下であることが好ましく、0.01%以上、5%以下がより好ましい。なお、スルホン酸基の換算は酸基で計算するものとする。
<Other structural units>
The copolymers of the present disclosure are characterized by having a sulfonic acid (salt) group on at least one end of the polymer backbone. Having a sulfonic acid (salt) group at at least one end of the main chain of a polymer means having a sulfonic acid (salt) group at one or more main chain ends. For example, in the case of a linear polymer, there are two main chain ends, one or both of which may have a sulfonic acid group. The main chain terminals described above may be present, and one or more of them may have a sulfonic acid group. By having a sulfonic acid (salt) group at at least one chain end, the sulfonic acid group at the main chain end of the copolymer is 0.01% by mass with respect to 100% by mass of the copolymer in which the ability to suppress silica scale is improved. % or more and 10% or less, and more preferably 0.01% or more and 5% or less. Incidentally, conversion of sulfonic acid group shall be calculated with acid group.
<本開示の共重体の物性等>
本開示の共重合体は、重量平均分子量(Mw)が28000以上、56000以下であり、30000以上、50000以下であることがより好ましく、37000以上、49000以下であることがさらに好ましい。上記範囲であることにより、本開示の水処理薬剤あるいはスケール防止剤のシリカスケール抑制能がより向上する傾向にある。
本開示の共重合体は、カルボン酸(塩)基やスルホン酸(塩)基などの酸基を含むが、本開示の共重合体の酸基は中和されていても良い。好ましくは酸基の合計の中和率は1モル%以上、90モル%以下であることが好ましい。なお、上記中和率は、例えば通常の酸塩基滴定などにより算出することができる。
<Physical properties, etc. of the copolymer of the present disclosure>
The copolymer of the present disclosure has a weight average molecular weight (Mw) of 28,000 or more and 56,000 or less, more preferably 30,000 or more and 50,000 or less, and even more preferably 37,000 or more and 49,000 or less. Within the above range, the silica scale inhibiting ability of the water treatment agent or scale inhibitor of the present disclosure tends to be further improved.
Although the copolymers of the present disclosure contain acid groups such as carboxylic acid (salt) groups and sulfonic acid (salt) groups, the acid groups of the copolymers of the present disclosure may be neutralized. Preferably, the total neutralization rate of acid groups is 1 mol % or more and 90 mol % or less. The above neutralization rate can be calculated, for example, by ordinary acid-base titration.
<本開示の共重合体の製造方法>
本開示の共重合体の製造方法は、特に制限されないが、通常は(メタ)アクリル酸(塩)、スルホン酸(塩)基含有単量体、必要に応じてその他の単量体に由来する構造単位を重合することにより製造することが好ましい。本開示の共重合体の製造工程においては、単量体の重合において重合開始剤を用いることが出来る。本開示の共重合体の製造工程において、分子量の調整のために必要に応じて連鎖移動剤を用いることが出来る。
<Method for producing the copolymer of the present disclosure>
The method for producing the copolymer of the present disclosure is not particularly limited, but usually (meth) acrylic acid (salt), a sulfonic acid (salt) group-containing monomer, and optionally other monomers. It is preferably produced by polymerizing the structural units. In the production process of the copolymer of the present disclosure, a polymerization initiator can be used in the polymerization of the monomers. A chain transfer agent can be used as necessary for adjusting the molecular weight in the production process of the copolymer of the present disclosure.
<本開示の連鎖移動剤>
本開示の連鎖移動剤は、分子量の調整のために用いることが出来る。例えば重亜硫酸(塩)類である重亜硫酸、メタ重亜硫酸、重亜硫酸ナトリウム、重亜硫酸カリウム、メタ重亜硫酸ナトリウム、メタ重亜硫酸カリウム、メルカプトエタノール、チオグリセロール、チオグリコール酸、2-メルカプトプロピオン酸、3-メルカプトプロピオン酸、チオリンゴ酸、チオグリコール酸オクチル、3-メルカプトプロピオン酸オクチル、2-メルカプトエタンスルホン酸、n-ドデシルメルカプタン、オクチルメルカプタン、ブチルチオグリコレート等の、チオール系連鎖移動剤;四塩化炭素、塩化メチレン、ブロモホルム、ブロモトリクロロエタン等の、ハロゲン化物;イソプロパノール、グリセリン等の、第2級アルコール;亜リン酸、次亜リン酸、及びその塩(次亜リン酸ナトリウム、次亜リン酸カリウム等)などが挙げられる。
<Chain transfer agent of the present disclosure>
The chain transfer agents of the present disclosure can be used for molecular weight control. For example, bisulfites (salts) such as bisulfite, metabisulfite, sodium bisulfite, potassium bisulfite, sodium metabisulfite, potassium metabisulfite, mercaptoethanol, thioglycerol, thioglycolic acid, 2-mercaptopropionic acid, Thiol-based chain transfer agents such as 3-mercaptopropionic acid, thiomalic acid, octyl thioglycolate, octyl 3-mercaptopropionate, 2-mercaptoethanesulfonic acid, n-dodecylmercaptan, octylmercaptan, butyl thioglycolate; Halides such as carbon chloride, methylene chloride, bromoform, bromotrichloroethane; secondary alcohols such as isopropanol and glycerin; phosphorous acid, hypophosphorous acid, and salts thereof (sodium hypophosphite, hypophosphite potassium etc.).
これらのうち本開示にかかる共重合体の製造においては少なくとも一つの主鎖末端にスルホン酸基を含有するために、重亜硫酸(塩)類を用いることが好ましい。これにより得られる共重合体の少なくとも一つの主鎖末端に効率よくスルホン酸基を導入することが出来る。連鎖移動剤は1種類を用いてもよく、2種類以上を用いても良い。連鎖移動剤の添加量は、単量体が良好に重合可能である量であれば制限されないが、好ましくは共重合に供する単量体混合物1モルに対して、好ましくは0.001モルから0.02モルである。 Among these, bisulfites (salts) are preferably used in the production of the copolymer according to the present disclosure because they contain a sulfonic acid group at least one terminal of the main chain. A sulfonic acid group can be efficiently introduced to at least one terminal of the main chain of the resulting copolymer. One type of chain transfer agent may be used, or two or more types may be used. The amount of the chain transfer agent to be added is not limited as long as the amount of the monomers can be well polymerized. 0.02 moles.
<本開示の重合開始剤>
本開示の共重合体を製造する工程において、通常は重合開始剤を使用する。重合開始剤としては公知のものが使用出来る。例えば過硫酸ナトリウム、過硫酸カリウム、過硫酸アンモニウムなどの過硫酸塩、過酸化水素、ジメチル2,2-’アゾビス(2-メチルプロピオネート)、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)、2,2’-アゾビス(2,4-ジメチルバレロニトリル)、2,2’-アゾビス(4-メトキシ-2,4-ジメチルバレロニトリル)、2,2’-アゾビス(イソ酪酸)ジメチル、4,4’-アゾビス(4-シアノ吉草酸)、2,2’-アゾビス(2-メチルプロピオンアミジン)二塩酸塩、2,2’-アゾビス[N-(2-カルボキシエチル)-2-メチルプロピオンアミジン]n水和物、2,2’-アゾビス[2-(2-イミダゾリン-2-イル)プロパン]二塩酸塩、2,2’-アゾビス[2-(2-イミダゾリン-2-イル)プロパン]二硫酸塩二水和物、1,1’-アゾビス(シクロヘキサン-1-カルボニトリル)等のアゾ系化合物、過酸化ベンゾイル、過酸化ラウロイル、過酢酸、ジ-t-ブチルパーオキサイド、クメンヒドロパーオキサイド等の有機過酸化物等を用いることが出来る。これらの中でも過硫酸塩であることが好ましく、上記連鎖移動剤を組み合わせることで、重合体主鎖末端にスルホン酸基を効率よく導入することが出来る。
<Polymerization initiator of the present disclosure>
A polymerization initiator is typically used in the process of producing the copolymers of the present disclosure. A known polymerization initiator can be used. Persulfates such as sodium persulfate, potassium persulfate, ammonium persulfate, hydrogen peroxide, dimethyl 2,2-'azobis(2-methylpropionate), 2,2'-azobis(isobutyronitrile), 2,2'-azobis(2-methylbutyronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile) , 2,2′-azobis(isobutyrate)dimethyl, 4,4′-azobis(4-cyanovaleric acid), 2,2′-azobis(2-methylpropionamidine) dihydrochloride, 2,2′-azobis [N-(2-carboxyethyl)-2-methylpropionamidine]n-hydrate, 2,2′-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride, 2,2′- Azo compounds such as azobis[2-(2-imidazolin-2-yl)propane]disulfate dihydrate, 1,1′-azobis(cyclohexane-1-carbonitrile), benzoyl peroxide, lauroyl peroxide , peracetic acid, di-t-butyl peroxide, and cumene hydroperoxide. Among these, persulfates are preferred, and by combining with the chain transfer agent, a sulfonic acid group can be efficiently introduced to the end of the main chain of the polymer.
[本開示の共重合体の用途]
本開示の共重合体は、水系用途において高い性能を発揮でき、地熱発電プロセス、油井やガス井のプロセス、正浸透膜もしくは逆浸透膜を用いた海水淡水化プロセスもしくは廃液濃縮プロセス、ボイラー水循環系、冷却水の循環系などに用いるスケール抑制剤として好ましく適用できる。
本開示の共重合体は、例えばシリカスケールや炭酸カルシウムのスケール抑制剤として好ましく適用できる。シリカスケールのスケール抑制剤として最も好ましく適用できる。
[Applications of the copolymer of the present disclosure]
The copolymer of the present disclosure can exhibit high performance in water-based applications, such as geothermal power generation processes, oil and gas well processes, seawater desalination processes or waste liquid concentration processes using forward or reverse osmosis membranes, and boiler water circulation systems. , it can be preferably applied as a scale inhibitor used in a cooling water circulation system.
The copolymer of the present disclosure can be preferably applied as, for example, a silica scale or calcium carbonate scale inhibitor. It can be most preferably applied as a scale inhibitor for silica scale.
[本開示の水処理薬剤]
本開示の水処理薬剤は、本開示の共重合体を含む。本開示の水処理薬剤は、本開示の共重合体を例えば、1質量%から70質量%含むことが好ましい。より好ましくは1質量%から50質量%、さらに好ましくは1質量%から40質量%、最も好ましくは1質量%から30質量%、さらに最も好ましくは1質量%から20質量%である。
本開示の水処理薬剤は、本開示の共重合体以外の成分を含んでいても良い。本開示の共重合体以外の成分としては、水などの溶剤;アルカリや酸などのpH調整剤;脱酸素剤;防食剤;キレート剤;アミノトリメチレンホスホン酸、1-ヒドロキシエチリデン-1,1-ジホスホン酸、およびこれらの塩などのホスホン酸(塩);本開示の共重合体以外のカルボキシ基含有重合体;界面活性剤;消泡剤;ピッチコントロール剤;スライムコントロール剤などが例示される。
本開示の水処理薬剤は、特に制限はないが、例えば各種用水において発生するスケールのスケール抑制剤として好ましく適用できる。
[Water treatment agent of the present disclosure]
Water treatment agents of the present disclosure include copolymers of the present disclosure. The water treatment agent of the present disclosure preferably contains, for example, 1% to 70% by weight of the copolymer of the present disclosure. More preferably 1% to 50% by mass, still more preferably 1% to 40% by mass, most preferably 1% to 30% by mass, and most preferably 1% to 20% by mass.
The water treatment agent of the present disclosure may contain ingredients other than the copolymer of the present disclosure. Components other than the copolymer of the present disclosure include solvents such as water; pH adjusters such as alkalis and acids; oxygen absorbers; anticorrosive agents; chelating agents; - Phosphonic acids (salts) such as diphosphonic acid and salts thereof; carboxy group-containing polymers other than the copolymers of the present disclosure; surfactants; antifoaming agents; pitch control agents; .
The water treatment chemical of the present disclosure is not particularly limited, but can be preferably applied, for example, as a scale inhibitor for scale generated in various types of water.
[本開示のスケール防止剤]
本開示のスケール防止剤は、本開示の共重合体を含む。本開示のスケール防止剤は、本開示の共重合体を例えば1質量%以上、100質量%以下含むことが好ましい。より好ましくは、1質量%以上、80質量%以下であり、最も好ましくは、1質量%以上、50質量%以下である。
本開示のスケール防止剤は、本開示の共重合体以外の成分を含んでいても良い。本開示の共重合体以外の成分としては、水などの溶剤;アルカリや酸などのpH調整剤;脱酸素剤;防食剤;キレート剤;アミノトリメチレンホスホン酸、1-ヒドロキシエチリデン-1,1-ジホスホン酸、およびこれらの塩などのホスホン酸(塩);本開示の共重合体以外のカルボキシ基含有重合体;界面活性剤;消泡剤;ピッチコントロール剤;スライムコントロール剤などが例示される。
本開示のスケール防止剤は、特に制限はないが、例えばシリカスケールや炭酸カルシウムのスケール抑制剤として好ましく適用できる。本開示のスケール防止剤は、特にシリカスケール抑制能にすぐれるため、シリカスケール防止剤として好ましく適用できる。
[Scale inhibitor of the present disclosure]
A scale inhibitor of the present disclosure comprises a copolymer of the present disclosure. The scale inhibitor of the present disclosure preferably contains the copolymer of the present disclosure in an amount of, for example, 1% by mass or more and 100% by mass or less. It is more preferably 1% by mass or more and 80% by mass or less, and most preferably 1% by mass or more and 50% by mass or less.
The scale inhibitor of the present disclosure may contain ingredients other than the copolymer of the present disclosure. Components other than the copolymer of the present disclosure include solvents such as water; pH adjusters such as alkalis and acids; oxygen absorbers; anticorrosive agents; chelating agents; - Phosphonic acids (salts) such as diphosphonic acid and salts thereof; carboxy group-containing polymers other than the copolymers of the present disclosure; surfactants; antifoaming agents; pitch control agents; .
The scale inhibitor of the present disclosure is not particularly limited, but can be preferably applied, for example, as a scale inhibitor for silica scale or calcium carbonate. The scale inhibitor of the present disclosure is particularly excellent in suppressing silica scale, and thus can be preferably applied as a silica scale inhibitor.
[本開示のスケール防止方法]
本開示のスケール防止方法は、本開示の水処理薬剤あるいはスケール防止剤あるいは本開示の共重合体を使用する。本開示のスケール防止方法は、好ましくは、スケール防止の対象となる系に、本開示の水処理薬剤あるいはスケール防止剤あるいは本開示の共重合体を添加する工程を含む。また、好ましくは、スケール防止の対象となる系中の、本開示の共重合体の存在量が、所定の範囲内となるように制御する工程を含む。スケール防止の対象となる系中の、本開示の共重合体の含有量は、0.1ppm以上、500ppm以下であることが好ましく、0.1ppm以上、300ppmであることがより好ましい。
[Scale prevention method of the present disclosure]
The scale control method of the present disclosure uses the water treatment chemical or scale inhibitor of the disclosure or the copolymer of the disclosure. The scale inhibition method of the present disclosure preferably includes the step of adding a water treatment chemical or scale inhibitor of the present disclosure or a copolymer of the present disclosure to the system to be scale inhibited. Moreover, it preferably includes a step of controlling the amount of the copolymer of the present disclosure in the system to be scale-inhibited so that it is within a predetermined range. The content of the copolymer of the present disclosure in the system to be scale-inhibited is preferably 0.1 ppm or more and 500 ppm or less, more preferably 0.1 ppm or more and 300 ppm.
以下に実施例を掲げて本発明を更に詳細に説明するが、本発明はこれらの実施例のみに限定されるものではない。なお、特に断りのない限り、「部」は「質量部」を、「%」は「質量%」を意味するものとする。
<重量平均分子量の測定条件(GPC)>
装置:東ソー株式会社製HLC8320
カラム:株式会社昭和電工製 SHODEX Asahipak GF-310-HQ、
GF-710-HQ、GF-1G-7B
カラム温度:40℃
流速:0.5ml/min
検量線:American Polymer Standards Corporaion社製 Polyacrylic acid standard
溶離液:0.1N酢酸ナトリウム
EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited only to these examples. Unless otherwise specified, "part" means "mass part" and "%" means "mass %".
<Conditions for measuring weight average molecular weight (GPC)>
Apparatus: HLC8320 manufactured by Tosoh Corporation
Column: Showa Denko Co., Ltd. SHODEX Asahipak GF-310-HQ,
GF-710-HQ, GF-1G-7B
Column temperature: 40°C
Flow rate: 0.5ml/min
Calibration curve: Polyacrylic acid standard manufactured by American Polymer Standards Corporation
Eluent: 0.1N sodium acetate
<合成例1>
還流冷却器、攪拌機(パドル翼)を備えた容量3LのSUS製反応容器に、純水251.5g及びモール塩0.031gを仕込み、攪拌しながら85℃まで昇温して重合反応系とした。次に、攪拌下、85℃に保持された重合反応系中に、80%アクリル酸水溶液(以下、「80%AA」とも称する。)517.5g、3-アリルオキシ-2-ヒドロキシプロパンスルホン酸ナトリウムの40%水溶液(以下、「40%HAPS」とも称する。)533.2g、15%過硫酸ナトリウム水溶液(以下、「15%NaPS」とも称する。)179.3g、及び、32.5%亜硫酸水素ナトリウム水溶液(以下、「32.5%SBS」とも称する。)18.6gを、それぞれ別々のノズルより滴下した。各溶液の滴下時間は、80%AAについては180分間、40%HAPSについては140分間、15%NaPSについては200分間、32.5%SBSについては170分間とした。また、各溶液の滴下速度は一定とし、各溶液の滴下は連続的に行った。15%NaPSの滴下終了後、更に30分間、前記反応溶液を85℃に保持(熟成)して重合を終了した。このようにして、固形分濃度44.8%の重合体水溶液(1)を得た。重合体(1)の重量平均分子量は37000であった。なお、仕込みと生成した重合体の組成比は同じである。
<Synthesis Example 1>
251.5 g of pure water and 0.031 g of Mohr's salt were charged into a 3 L SUS reaction vessel equipped with a reflux condenser and a stirrer (paddle blade), and the temperature was raised to 85° C. while stirring to form a polymerization reaction system. . Next, 517.5 g of an 80% acrylic acid aqueous solution (hereinafter also referred to as "80% AA") and sodium 3-allyloxy-2-hydroxypropanesulfonate were added to a polymerization reaction system maintained at 85° C. with stirring. 40% aqueous solution (hereinafter also referred to as “40% HAPS”) 533.2 g, 15% sodium persulfate aqueous solution (hereinafter also referred to as “15% NaPS”) 179.3 g, and 32.5% hydrogen sulfite 18.6 g of sodium aqueous solution (hereinafter also referred to as "32.5% SBS") was dropped from separate nozzles. The dropping time of each solution was 180 minutes for 80% AA, 140 minutes for 40% HAPS, 200 minutes for 15% NaPS, and 170 minutes for 32.5% SBS. Further, the dropping rate of each solution was constant, and the dropping of each solution was performed continuously. After the dropwise addition of 15% NaPS was completed, the reaction solution was kept at 85° C. for an additional 30 minutes (aging) to complete the polymerization. Thus, an aqueous polymer solution (1) having a solid concentration of 44.8% was obtained. The weight average molecular weight of polymer (1) was 37,000. In addition, the composition ratio of the charged polymer and the produced polymer is the same.
<合成例2>
還流冷却器、攪拌機(パドル翼)を備えた容量3LのSUS製反応容器に、純水250.78g、及びモール塩0.031gを仕込み、攪拌しながら、85℃まで昇温して重合反応系とした。次に、攪拌下、85℃に保持された重合反応系中に、80%AA508.9g、40%HAPS524.3g、15%NaPS176.3g、及び、10%SBS39.7gを、それぞれ別々のノズルより滴下した。各溶液の滴下時間は、80%AAについては180分間、40%HAPSについては140分間、15%NaPSについては200分間、10%SBSについては170分間とした。また、各溶液の滴下速度は一定とし、各溶液の滴下は連続的に行った。15%NaPSの滴下終了後、更に30分間、上記反応溶液を85℃に保持(熟成)して重合を終了した。
このようにして、固形分濃度44.5%の重合体水溶液(2)を得た。重合体(2)の重量平均分子量は49000であった。なお、仕込みと生成した重合体の組成比は同じである。
<Synthesis Example 2>
250.78 g of pure water and 0.031 g of Mohr's salt were charged into a 3 L SUS reaction vessel equipped with a reflux condenser and a stirrer (paddle blade), and the temperature was raised to 85° C. while stirring to form a polymerization reaction system. and Next, 508.9 g of 80% AA, 524.3 g of 40% HAPS, 176.3 g of 15% NaPS, and 39.7 g of 10% SBS were added to the polymerization reaction system maintained at 85°C with stirring from separate nozzles. Dripped. The dropping time of each solution was 180 minutes for 80% AA, 140 minutes for 40% HAPS, 200 minutes for 15% NaPS, and 170 minutes for 10% SBS. Further, the dropping rate of each solution was constant, and the dropping of each solution was performed continuously. After the addition of 15% NaPS was completed, the reaction solution was kept at 85° C. for an additional 30 minutes (aged) to complete the polymerization.
Thus, an aqueous polymer solution (2) having a solid concentration of 44.5% was obtained. The weight average molecular weight of polymer (2) was 49,000. In addition, the composition ratio of the charged polymer and the produced polymer is the same.
<合成例3>
還流冷却器、攪拌機(パドル翼)を備えた容量3LのSUS製反応容器に、純水250.8g、及びモール塩0.031gを仕込み、攪拌しながら、85℃まで昇温して重合反応系とした。次に、攪拌下、85℃に保持された重合反応系中に、80%AA457.2g、40%HAPS609.7g、15%NaPS165.2g、及び、32.5%SBS17.2gを、それぞれ別々のノズルより滴下した。各溶液の滴下時間は、80%AAについては180分間、40%HAPSについては140分間、15%NaPSについては200分間、32.5%SBSについては170分間とした。また、各溶液の滴下速度は一定とし、各溶液の滴下は連続的に行った。15%NaPSの滴下終了後、更に30分間、上記反応溶液を85℃に保持(熟成)して重合を終了した。
このようにして、固形分濃度43.6%の重合体水溶液(3)を得た。重合体(3)の重量平均分子量は37000であった。なお、仕込みと生成した重合体の組成比は同じである。
<Synthesis Example 3>
250.8 g of pure water and 0.031 g of Mohr's salt were charged into a 3 L SUS reaction vessel equipped with a reflux condenser and a stirrer (paddle blade), and the temperature was raised to 85° C. while stirring to form a polymerization reaction system. and Next, 457.2 g of 80% AA, 609.7 g of 40% HAPS, 165.2 g of 15% NaPS, and 17.2 g of 32.5% SBS were separately added to the polymerization reaction system maintained at 85° C. under stirring. dripped from the nozzle. The dropping time of each solution was 180 minutes for 80% AA, 140 minutes for 40% HAPS, 200 minutes for 15% NaPS, and 170 minutes for 32.5% SBS. Further, the dropping rate of each solution was constant, and the dropping of each solution was performed continuously. After the addition of 15% NaPS was completed, the reaction solution was kept at 85° C. for an additional 30 minutes (aged) to complete the polymerization.
Thus, an aqueous polymer solution (3) having a solid concentration of 43.6% was obtained. The weight average molecular weight of polymer (3) was 37,000. In addition, the composition ratio of the charged polymer and the produced polymer is the same.
<合成例4>
流冷却器、攪拌機(パドル翼)を備えた容量3LのSUS製反応容器に、純水462.6g、及びモール塩0.031gを仕込み、攪拌しながら、85℃まで昇温して重合反応系とした。次に、攪拌下、85℃に保持された重合反応系中に、80%AA674.3g、40%HAPS238.0g、15%NaPS103.1g、及び、32.5%SBS21.9gを、それぞれ別々のノズルより滴下した。各溶液の滴下時間は、80%AAについては180分間、40%HAPSについては155分間、15%NaPSについては200分間、32.5%SBSについては170分間とした。また、各溶液の滴下速度は一定とし、各溶液の滴下は連続的に行った。80%AAの滴下終了後、更に30分間、上記反応溶液を85℃に保持(熟成)し、重合を終了した。このようにして、固形分濃度43.6%の重合体水溶液(4)を得た。重合体(4)の重量平均分子量は44000であった。なお、仕込みと生成した重合体の組成比は同じである。
<Synthesis Example 4>
462.6 g of pure water and 0.031 g of Mohr's salt were charged into a 3 L SUS reaction vessel equipped with a flow cooler and a stirrer (paddle blade), and the temperature was raised to 85° C. while stirring to form a polymerization reaction system. and Next, 674.3 g of 80% AA, 238.0 g of 40% HAPS, 103.1 g of 15% NaPS, and 21.9 g of 32.5% SBS were separately added to a polymerization reaction system maintained at 85°C under stirring. dripped from the nozzle. The dropping time of each solution was 180 minutes for 80% AA, 155 minutes for 40% HAPS, 200 minutes for 15% NaPS, and 170 minutes for 32.5% SBS. Further, the dropping rate of each solution was constant, and the dropping of each solution was performed continuously. After the dropwise addition of 80% AA was completed, the above reaction solution was kept at 85° C. for an additional 30 minutes (aging) to complete the polymerization. Thus, an aqueous polymer solution (4) having a solid concentration of 43.6% was obtained. The weight average molecular weight of polymer (4) was 44,000. In addition, the composition ratio of the charged polymer and the produced polymer is the same.
<合成例5>
還流冷却器、攪拌機を備えた容量5LのSUS製反応容器に、イオン交換水611.3gを仕込み、攪拌しながら沸点還流状態まで昇温した。次いで攪拌下、沸点還流状態の重合反応系中に、80%AA57.6g、37%アクリル酸ナトリウム(以下「37%SA」とも称する)1145・9g、40%HAPS502.9g、15%NaPS132.2g、35%過酸化水素水(以下、「35%H2O2」とも称する)19.0g、イオン交換水367.9gをそれぞれ別々のノズルより滴下した。各溶液の滴下時間は80%AAおよび37%SAが120分、40%HAPS、イオン交換水が90分、15%NaPSが140分、35%H2O2が120分であった。このようにして、固形分50.2%の重合体水溶液(5)を得た。重合体(5)の重量平均分子量は5000であった。なお、仕込みと生成した重合体の組成比は同じである。
<Synthesis Example 5>
611.3 g of ion-exchanged water was introduced into a 5 L SUS reaction vessel equipped with a reflux condenser and a stirrer, and the temperature was raised to the boiling point reflux state while stirring. Then, while stirring, 57.6 g of 80% AA, 1145.9 g of 37% sodium acrylate (hereinafter also referred to as "37% SA"), 502.9 g of 40% HAPS, and 132.2 g of 15% NaPS were added to the polymerization reaction system in the boiling point reflux state. , 35% hydrogen peroxide water (hereinafter also referred to as “35% H 2 O 2 ”) 19.0 g, and ion-exchanged water 367.9 g were dropped from separate nozzles. The dropping time of each solution was 120 minutes for 80% AA and 37% SA, 90 minutes for 40% HAPS and deionized water, 140 minutes for 15% NaPS, and 120 minutes for 35% H 2 O 2 . Thus, an aqueous polymer solution (5) having a solid content of 50.2% was obtained. The weight average molecular weight of polymer (5) was 5,000. In addition, the composition ratio of the charged polymer and the produced polymer is the same.
<合成例6>
還流冷却器、攪拌機を備えた容量5LのSUS製反応容器に、イオン交換水1620gを仕込み、攪拌しながら沸点還流状態まで昇温した。次いで攪拌下、沸点還流状態の重合反応系中に、80%AA455g、15%NaPS133gをそれぞれ別々のノズルより滴下した。各溶液の滴下時間は80%AAが180分、15%NaPSが185分、イオン交換水が170分であった。15%NaPS溶液滴下終了後、更に30分間、上記反応液を沸点還流状態に保持(熟成)し、重合を完結させた。このようにして固形分45.7%の重合体水溶液(6)を得た。重合体(6)の重量平均分子量は10000であった。なお、仕込みと生成した重合体の組成比は同じである。
<Synthesis Example 6>
1,620 g of ion-exchanged water was introduced into a 5-liter SUS reaction vessel equipped with a reflux condenser and a stirrer, and the temperature was raised to the boiling point reflux state while stirring. Then, while stirring, 455 g of 80% AA and 133 g of 15% NaPS were added dropwise from separate nozzles into the polymerization reaction system in the boiling point reflux state. The dropping time of each solution was 180 minutes for 80% AA, 185 minutes for 15% NaPS, and 170 minutes for deionized water. After the dropwise addition of the 15% NaPS solution was completed, the above reaction solution was maintained (aged) at the boiling point reflux state for an additional 30 minutes to complete the polymerization. Thus, an aqueous polymer solution (6) having a solid content of 45.7% was obtained. The weight average molecular weight of polymer (6) was 10,000. In addition, the composition ratio of the charged polymer and the produced polymer is the same.
<シリカスケール抑制率評価試験>
珪酸ナトリウム水溶液:メタケイ酸ナトリウム9水和物(Aldrich社製)2.129gにイオン交換水を加えて合計150gとなるように調整する。
硫酸マグネシウム水溶液:硫酸マグネシウム7水和物(和光純薬株式会社製)8.115gにイオン交換水を加えて合計1000gとなるように調整する。
ホウ酸バッファー:ホウ酸(関東化学株式会社製)7.42g、ホウ酸ナトリウム・10水和物)(和光純薬株式会社製)19.07gを混合し、ホウ酸バッファーを調製する。
容器に脱イオン水73gを入れ攪拌しながら上記ホウ酸バッファー2g、上記珪酸ナトリウム水溶液10g、重合体濃度が1000ppmになるように希釈した重合体水溶液5g、上記の硫酸マグネシウム水溶液10gを添加し、60℃の温浴につけ5h放置した。5h放置後、吸引ろ過装置に0.1μm目開きの濾紙を使用して、試験液を吸引ろ過した。得られた濾液をXR-Fで測定してSi濃度をSiO2換算で測定した。
シリカスケール抑制率(%)=試験後SiO2(ppm)/試験前SiO2濃度(ppm)×100
シリカスケール抑制率は以下の基準で判定した。
<抑制率評価基準>
90%以上:◎
70~90%:○
30~70%:△
30%未満:×
<実施例1>
合成例1で得られた重合体(1)の1000ppm水溶液5gについて、上記シリカスケール抑制率価試験を行った。
<実施例2>
合成例2で得られた重合体(2)の1000ppm水溶液5gについて、上記シリカスケール抑制率評価試験を行った。
<実施例3>
合成例3で得られた重合体(3)の1000ppm水溶液5gについて、上記シリカスケール抑制率評価試験を行った。
<比較例1>
合成例4で得られた重合体(4)の1000ppm水溶液5gについて、上記シリカスケール抑制率評価試験を行った。
<比較例2>
合成例5で得られた重合体(5)の1000ppm水溶液5gについて、上記シリカスケール抑制率評価試験を行った。
<比較例3>
合成例6で得られた重合体(6)の1000ppm水溶液5gについて、上記シリカスケール抑制率評価試験を行った。
<比較例4>
重合体水溶液を添加しない以外は上記シリカスケール抑制率評価試験と同様に評価試験を行った。
<Silica scale suppression rate evaluation test>
Sodium silicate aqueous solution: To 2.129 g of sodium metasilicate nonahydrate (manufactured by Aldrich), deionized water is added to adjust the total amount to 150 g.
Magnesium sulfate aqueous solution: Deionized water is added to 8.115 g of magnesium sulfate heptahydrate (manufactured by Wako Pure Chemical Industries, Ltd.) to make a total of 1000 g.
Borate buffer: 7.42 g of boric acid (manufactured by Kanto Chemical Co., Ltd.) and 19.07 g of sodium borate decahydrate (manufactured by Wako Pure Chemical Industries, Ltd.) are mixed to prepare a borate buffer.
73 g of deionized water was placed in a container, and 2 g of the boric acid buffer, 10 g of the sodium silicate aqueous solution, 5 g of the polymer aqueous solution diluted to a polymer concentration of 1000 ppm, and 10 g of the magnesium sulfate aqueous solution were added while stirring. C. and left for 5 hours. After standing for 5 hours, the test solution was suction-filtered using a filter paper with 0.1 μm openings in a suction filtration device. The obtained filtrate was measured by XR-F to measure the Si concentration in terms of SiO 2 .
Silica scale suppression rate (%) = SiO 2 after test (ppm) / SiO 2 concentration before test (ppm) x 100
The silica scale suppression rate was determined according to the following criteria.
<Suppression Rate Evaluation Criteria>
90% or more: ◎
70-90%: ○
30-70%: △
Less than 30%: ×
<Example 1>
5 g of the 1000 ppm aqueous solution of polymer (1) obtained in Synthesis Example 1 was subjected to the above silica scale inhibition rate test.
<Example 2>
5 g of the 1000 ppm aqueous solution of polymer (2) obtained in Synthesis Example 2 was subjected to the above silica scale inhibition rate evaluation test.
<Example 3>
5 g of the 1000 ppm aqueous solution of polymer (3) obtained in Synthesis Example 3 was subjected to the above silica scale inhibition rate evaluation test.
<Comparative Example 1>
5 g of the 1000 ppm aqueous solution of polymer (4) obtained in Synthesis Example 4 was subjected to the above silica scale inhibition rate evaluation test.
<Comparative Example 2>
5 g of the 1000 ppm aqueous solution of polymer (5) obtained in Synthesis Example 5 was subjected to the above silica scale inhibition rate evaluation test.
<Comparative Example 3>
5 g of the 1000 ppm aqueous solution of polymer (6) obtained in Synthesis Example 6 was subjected to the above silica scale inhibition rate evaluation test.
<Comparative Example 4>
An evaluation test was conducted in the same manner as the above silica scale inhibition rate evaluation test except that the aqueous polymer solution was not added.
実施例1から実施例3、比較例1から比較例4の実験結果を表1に記載した。 Experimental results of Examples 1 to 3 and Comparative Examples 1 to 4 are shown in Table 1.
表1の結果から、本開示の共重合体は、シリカスケール抑制能に優れることがわかった。
From the results in Table 1, it was found that the copolymer of the present disclosure is excellent in silica scale suppressing ability.
Claims (6)
(一般式(1)中、R1は、水素原子またはメチル基を表し、XおよびYは、それぞれ独立に水酸基またはスルホン酸(塩)基を表す(但しX、Yのうち少なくとも一方はスルホン酸(塩)基を表す。アスタリスクは、一般式(1)で表される構造単位が結合している同種もしくは異種の他の構造単位に含まれる原子を表す。) 2. The (meth)acrylic acid-based copolymer according to claim 1, wherein the structural unit derived from the sulfonic acid (salt) group-containing monomer is represented by general formula (1).
(In general formula (1), R 1 represents a hydrogen atom or a methyl group, and X and Y each independently represent a hydroxyl group or a sulfonic acid (salt) group (provided that at least one of X and Y is a sulfonic acid represents a (salt) group.The asterisk represents an atom contained in another structural unit of the same or different type to which the structural unit represented by general formula (1) is bonded.)
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