US20130109607A1 - Anti-corrosive agent for washing of metal with acid, detergent solution composition, and method for washing of metal - Google Patents
Anti-corrosive agent for washing of metal with acid, detergent solution composition, and method for washing of metal Download PDFInfo
- Publication number
- US20130109607A1 US20130109607A1 US13/808,670 US201113808670A US2013109607A1 US 20130109607 A1 US20130109607 A1 US 20130109607A1 US 201113808670 A US201113808670 A US 201113808670A US 2013109607 A1 US2013109607 A1 US 2013109607A1
- Authority
- US
- United States
- Prior art keywords
- acid
- metal
- washing
- corrosive agent
- constituent unit
- 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.)
- Abandoned
Links
- 239000002253 acid Substances 0.000 title claims abstract description 64
- 239000003518 caustics Substances 0.000 title claims abstract description 64
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 63
- 239000002184 metal Substances 0.000 title claims abstract description 63
- 238000005406 washing Methods 0.000 title claims abstract description 48
- 239000003599 detergent Substances 0.000 title claims description 30
- 239000000203 mixture Substances 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 16
- 239000000470 constituent Substances 0.000 claims abstract description 69
- 229920000642 polymer Polymers 0.000 claims abstract description 52
- 125000002091 cationic group Chemical group 0.000 claims abstract description 44
- 125000000129 anionic group Chemical group 0.000 claims abstract description 36
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 77
- 150000001875 compounds Chemical class 0.000 claims description 59
- 239000000178 monomer Substances 0.000 claims description 50
- -1 inorganic acid salt Chemical class 0.000 claims description 39
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 22
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 19
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 18
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 17
- NJSSICCENMLTKO-HRCBOCMUSA-N [(1r,2s,4r,5r)-3-hydroxy-4-(4-methylphenyl)sulfonyloxy-6,8-dioxabicyclo[3.2.1]octan-2-yl] 4-methylbenzenesulfonate Chemical compound C1=CC(C)=CC=C1S(=O)(=O)O[C@H]1C(O)[C@@H](OS(=O)(=O)C=2C=CC(C)=CC=2)[C@@H]2OC[C@H]1O2 NJSSICCENMLTKO-HRCBOCMUSA-N 0.000 claims description 17
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 17
- 239000011976 maleic acid Substances 0.000 claims description 17
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 14
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 14
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 9
- 150000007522 mineralic acids Chemical class 0.000 claims description 9
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 7
- 229910052700 potassium Inorganic materials 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- 150000007524 organic acids Chemical class 0.000 claims description 6
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 claims description 5
- 229940018557 citraconic acid Drugs 0.000 claims description 5
- 239000001530 fumaric acid Substances 0.000 claims description 5
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 5
- 150000002431 hydrogen Chemical class 0.000 claims description 4
- PSZAEHPBBUYICS-UHFFFAOYSA-N 2-methylidenepropanedioic acid Chemical compound OC(=O)C(=C)C(O)=O PSZAEHPBBUYICS-UHFFFAOYSA-N 0.000 claims description 3
- 150000007513 acids Chemical class 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims description 3
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 claims description 3
- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 53
- 238000005260 corrosion Methods 0.000 description 38
- 230000015572 biosynthetic process Effects 0.000 description 34
- 238000003786 synthesis reaction Methods 0.000 description 34
- 238000006116 polymerization reaction Methods 0.000 description 29
- 230000000052 comparative effect Effects 0.000 description 24
- 230000007797 corrosion Effects 0.000 description 21
- 229920001577 copolymer Polymers 0.000 description 18
- 238000007334 copolymerization reaction Methods 0.000 description 18
- 230000000694 effects Effects 0.000 description 15
- 239000007864 aqueous solution Substances 0.000 description 13
- 0 [1*]N1CC(C)CC(CC)C1.[1*]N1CC(CC)C(CC)C1.[2*][N+]1([3*])CC(C)CC(CC)C1.[2*][N+]1([3*])CC(CC)C(CC)C1.[CH3-].[CH3-] Chemical compound [1*]N1CC(C)CC(CC)C1.[1*]N1CC(CC)C(CC)C1.[2*][N+]1([3*])CC(C)CC(CC)C1.[2*][N+]1([3*])CC(CC)C(CC)C1.[CH3-].[CH3-] 0.000 description 11
- 230000001629 suppression Effects 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 9
- OBMBUODDCOAJQP-UHFFFAOYSA-N 2-chloro-4-phenylquinoline Chemical compound C=12C=CC=CC2=NC(Cl)=CC=1C1=CC=CC=C1 OBMBUODDCOAJQP-UHFFFAOYSA-N 0.000 description 8
- 238000005227 gel permeation chromatography Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 6
- KIWBPDUYBMNFTB-UHFFFAOYSA-N Ethyl hydrogen sulfate Chemical compound CCOS(O)(=O)=O KIWBPDUYBMNFTB-UHFFFAOYSA-N 0.000 description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium peroxydisulfate Substances [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 6
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 6
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- YIOJGTBNHQAVBO-UHFFFAOYSA-N dimethyl-bis(prop-2-enyl)azanium Chemical class C=CC[N+](C)(C)CC=C YIOJGTBNHQAVBO-UHFFFAOYSA-N 0.000 description 6
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- JZMJDSHXVKJFKW-UHFFFAOYSA-M methyl sulfate(1-) Chemical compound COS([O-])(=O)=O JZMJDSHXVKJFKW-UHFFFAOYSA-M 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910003202 NH4 Inorganic materials 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 description 5
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- HHVIBTZHLRERCL-UHFFFAOYSA-N CS(C)(=O)=O Chemical compound CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 239000002685 polymerization catalyst Substances 0.000 description 4
- 238000010526 radical polymerization reaction Methods 0.000 description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 4
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 3
- VVJKKWFAADXIJK-UHFFFAOYSA-N Allylamine Chemical compound NCC=C VVJKKWFAADXIJK-UHFFFAOYSA-N 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003480 eluent Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- DYUWTXWIYMHBQS-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine Chemical compound C=CCNCC=C DYUWTXWIYMHBQS-UHFFFAOYSA-N 0.000 description 3
- 239000002798 polar solvent Substances 0.000 description 3
- 229920006027 ternary co-polymer Polymers 0.000 description 3
- IUHGJRWJMWWDMQ-UHFFFAOYSA-N 1-ethenyl-3-ethylimidazolidin-1-ium;bromide Chemical compound [Br-].CCN1CC[NH+](C=C)C1 IUHGJRWJMWWDMQ-UHFFFAOYSA-N 0.000 description 2
- XBWYYTURPBHPFJ-UHFFFAOYSA-M 3-ethyl-1,3-benzothiazol-3-ium;bromide Chemical compound [Br-].C1=CC=C2[N+](CC)=CSC2=C1 XBWYYTURPBHPFJ-UHFFFAOYSA-M 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 229960004275 glycolic acid Drugs 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 2
- 235000005985 organic acids Nutrition 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- QWUWMCYKGHVNAV-UHFFFAOYSA-N 1,2-dihydrostilbene Chemical group C=1C=CC=CC=1CCC1=CC=CC=C1 QWUWMCYKGHVNAV-UHFFFAOYSA-N 0.000 description 1
- 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 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 229920006317 cationic polymer Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 1
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- HVUHISUXSQCUHS-UHFFFAOYSA-M diethyl-bis(prop-2-enyl)azanium;bromide Chemical compound [Br-].C=CC[N+](CC)(CC)CC=C HVUHISUXSQCUHS-UHFFFAOYSA-M 0.000 description 1
- IOMDIVZAGXCCAC-UHFFFAOYSA-M diethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](CC)(CC)CC=C IOMDIVZAGXCCAC-UHFFFAOYSA-M 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- YRHAJIIKYFCUTG-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;bromide Chemical compound [Br-].C=CC[N+](C)(C)CC=C YRHAJIIKYFCUTG-UHFFFAOYSA-M 0.000 description 1
- 238000002523 gelfiltration Methods 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 125000006178 methyl benzyl group Chemical group 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- WGESLFUSXZBFQF-UHFFFAOYSA-N n-methyl-n-prop-2-enylprop-2-en-1-amine Chemical compound C=CCN(C)CC=C WGESLFUSXZBFQF-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 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
- 125000001453 quaternary ammonium group Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011780 sodium chloride Substances 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
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical class [H]C([*])=C([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/0005—Other compounding ingredients characterised by their effect
- C11D3/0073—Anticorrosion compositions
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3796—Amphoteric polymers or zwitterionic polymers
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/08—Acids
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/173—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/061—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors nitrogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/16—Metals
Definitions
- the present invention relates to an anti-corrosive agent for washing of a metal with an acid that is excellent in anti-corrosion effect and stability and its applications.
- acid washing using an acid detergent solution for a metal (hereinafter, also referred to as an “acid solution”) is usually performed.
- the acid detergent solution for a metal include aqueous solutions of inorganic acids such as sulfuric acid, hydrochloric acid and nitric acid; organic acids such as phosphoric acid, sulfamic acid, hydrofluoric acid, oxalic acid, citric acid, glycolic acid and formic acid; chelating agents such as ethylenediaminetetraacetic acid and mixtures thereof.
- inorganic acids such as sulfuric acid, hydrochloric acid and nitric acid
- organic acids such as phosphoric acid, sulfamic acid, hydrofluoric acid, oxalic acid, citric acid, glycolic acid and formic acid
- chelating agents such as ethylenediaminetetraacetic acid and mixtures thereof.
- anti-corrosive agents to be added to the acid have been used in order to solve such a problem.
- nitrogen-containing organic compounds are representative examples of such anti-corrosive agents.
- quaternary ammonium salts are known (for example, see Patent Document 1).
- quaternary ammonium salts 1-vinyl-3-ethylimidazolinium bromide, 3-ethylbenzothiazolium bromide, ethyltriethanolammonium bromide and the like are used.
- a nitrogen-containing organic compound other than the quaternary ammonium salts is concurrently used.
- hexamethylenetetramine can be used (Patent Document 1).
- Such a nitrogen-containing organic compound has a detrimental effect of reducing the acid washing rate. Accordingly, when a nitrogen-containing organic compound of these is contained in an acid detergent solution for a metal, the acid washing time becomes further longer, and the deterioration in working efficiency cannot be avoided. Also, the anti-corrosion effect thereof is not sufficiently satisfying.
- thiourea and derivatives thereof have also been proposed (for example, see Patent Document 2).
- thiourea and derivatives thereof also have drawbacks similar to those of the quaternary ammonium salts.
- the nitrogen-containing organic compound acting as an anti-corrosive agent homopolymers of quaternary ammonium salt-substituted vinyl compounds and cationic polymers such as polyamine compounds having a cationic constituent unit and a sulfur dioxide unit (for example, see Patent Document 3) are known.
- the polyamine compounds have an anti-corrosion effect higher than that of the conventional nitrogen-containing organic compound, and are useful as an additive for the acid detergent solution for a metal,
- attempts to shorten the acid washing time for the efficiency in the acid washing have been made recently. For this reason, the content of the acid in the acid detergent solution for a metal has been increased, and therefore development of an anti-corrosive agent having a higher anti-corrosion effect has been demanded.
- the copolymers having a cationic constituent unit and a sulfur dioxide unit currently in use may also change in the anti-corrosion effect as the concentration thereof changes. So, if the concentration of the anti-corrosive agent contained in the acid detergent solution for a metal using such a copolymer changes over the time, the problem of the fluctuation in the property of the final products may be caused therefrom.
- Patent Document 1 JP 61-037988 A
- Patent Document 2 JP 11-050280 A
- Patent Document 3 JP 2000-96049 A
- the present inventors attempted to develop an anti-corrosive agent for washing of a metal with an acid in which an anti-corrosion effect is high in acid washing of a surface of a metal, and change in an anti-corrosion effect is small even if the concentration of the anti-corrosive agent changes.
- an amphoteric polymer compound having a specific cationic constituent unit, a specific anionic constituent unit, and a constituent unit derived from sulfur dioxide.
- an object of the present invention is to provide an anti-corrosive agent for washing of a metal with an acid in which an anti-corrosion effect is high in acid washing of a surface of a metal, and change in an anti-corrosion rate is small even if the concentration of the anti-corrosive agent changes.
- the present invention relates to any of (1) to (7) below:
- An anti-corrosive agent for washing of a metal with an acid comprising an amphoteric polymer compound (P) having:
- R 1 in formulae (Ia) and (Tb), above is hydrogen atom, methyl group, ethyl group, or benzyl group
- R 2 and R 3 in formulae (IIa) and (IIb), above each independently are hydrogen atom, methyl group, ethyl group, or benzyl group
- X ⁇ in formulae (IIa) and (IIb), above, is a counter ion
- R 4 in formula (III), above is hydrogen or methyl group
- Y in formulae (III), (IV) and (V), above each independently are hydrogen, Na, K, NH 4 , 1 ⁇ 2Ca, 1 ⁇ 2Mg, 1 ⁇ 2Fe, 1 ⁇ 3Al, or 1 ⁇ 3Fe for each carboxy group to which they are bonded;
- R 5 in formula (VII), above is hydrogen atom, methyl group, ethyl group, or benzyl group
- R 6 and R 7 in formula (VIII), above each independently are hydrogen atom, methyl group, ethyl group, or benzyl group
- Z ⁇ in formula (VIII), above, is a counter ion
- a detergent solution composition comprising an acid solution and an anti-corrosive agent according to any one of (1) to (5), wherein the content of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′) is 0.1 to 50000 mg based on 1 L of the acid solution.
- a method for washing a metal characterized in that the detergent solution composition according to (6) is sprayed to the surface of the metal or the surface of the metal is immersed in the detergent solution composition to carry out the washing.
- the anti-corrosive agent for washing of a metal with an acid according to the present invention can effectively suppress corrosion of a metal when the surface of the metal is acid washed. Additionally, in the anti-corrosive agent for washing of a metal with an acid according to the present invention, change in the anti-corrosion rate is extremely small even if the concentration of the anti-corrosive agent changes, and therefore quality of the final product can easily be kept constant, As a result, the anti-corrosive agent for washing of a metal with an acid according to the present invention makes great contribution to the development of a variety of industries such as the field of metal industries.
- a first anti-corrosive agent for washing of a metal with an acid according to the present invention comprises an amphoteric polymer compound (P) having:
- At least one cationic constituent unit (A) having a structure represented by the following structural formula (Ia) or (Ib), a structure corresponding to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (IIa) or (IIb):
- R 1 in formulae (Ia) and (Ib), above is hydrogen atom, methyl group, ethyl group, or benzyl group
- R 2 and R 3 in formulae (IIa) and (IIb), above each independently are hydrogen atom, methyl group, ethyl group, or benzyl group
- X ⁇ in formulae (IIa) and (IIb), above, is a counter ion
- R 4 in formula (III), above is hydrogen or methyl group and Y in formulae (III), (IV) and (V) each independently are hydrogen, Na, K, NH 4 , 1 ⁇ 2Ca, 1 ⁇ 2Mg, 1 ⁇ 2Fe, 1 ⁇ 3Al, or 1 ⁇ 3Fe for each carboxy group to which they are bonded; and
- “comprise” is used with an intention that the term includes both cases that the entirety of the first anti-corrosive agent for washing of a metal with an acid according to the present invention is constituted of the amphoteric polymer compound (P) and that a part of the first anti-corrosive agent for washing of a metal with an acid according to the present invention is constituted of the amphoteric polymer compound (P).
- the amphoteric polymer compound (P) used in the present invention may include a fourth constituent unit that is a constituent unit not corresponding to any of the cationic constituent unit (A), the anionic constituent unit (B) and the constituent unit (C), a constituent unit derived from a monomer such as monoallylamine and acrylamide for example.
- the constituent unit derived from a monomer such as monoallylamine and acrylamide may be included in a proportion of 15 mol % or less, preferably 10 mol % or less, and more preferably 5 mol % or less based on the total constituent units, for example.
- the molar ratio of cationic constituent units (A)/anionic constituent units (B) in the copolymerization is preferably 10/1 to 1/3, more preferably 8/1 to 1/2, and particularly preferably 6/1 to 1/1.
- the molar ratio of the cationic constituent unit (A)/constituent unit derived from sulfur dioxide (C) in the copolymerization is preferably 1/1 to 1/0.01, more preferably 1.1/1 to 1/0.025, and particularly preferably 1.3/1 to 1/0.05.
- the copolymerization ratio of the anionic constituent unit (B)/constituent unit derived from sulfur dioxide (C) is preferably 20/1 to 1/20, more preferably 15/1 to 1/15, and particularly preferably 10/1 to 1/10.
- the amphoteric polymer compound (P) usually has a molecular weight of 1,000 to 10,000,000, preferably 3,000 to 1,000,000, more preferably 5,000 to 100,000, still more preferably 10,000 to 50,000, and particularly preferably 15,000 to 30,000.
- the cationic constituent unit (A) that constitutes the amphoteric polymer compound (P) used in the present invention has a structure represented by the following structural formula (Ia) or (Ib), a structure corresponding to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (IIa) or (IIb).
- R ⁇ in formulae (Ia) and (Ib), above is hydrogen atom, methyl group, ethyl group, or benzyl group
- R 2 and R 3 in formulae (IIa) and (IIb), above each independently are hydrogen atom, methyl group, ethyl group, or benzyl group
- X in formulae (IIa) and (IIb), above, is a counter ion.
- X ⁇ is preferably an anion derived from an organic acid or an inorganic acid, and particularly preferably a halogen ion (more preferably, Cl ⁇ , Br ⁇ , or I ⁇ ), methylsulfuric acid ion, ethylsulfuric acid ion or acetate ion.
- a halogen ion more preferably, Cl ⁇ , Br ⁇ , or I ⁇
- methylsulfuric acid ion ethylsulfuric acid ion or acetate ion.
- At least a part of the cationic constituent unit (A) is preferably derived from a cationic monomer selected from the group consisting of diallylamines and inorganic acid salts and organic acid salts thereof. At least a part of the cationic constituent unit (A) is particularly preferably a constituent unit derived from diallyldimethylammonium chloride.
- amphoteric polymer compound (P) a single species of the cationic constituent unit (A) may solely be used, and more than one species of the cationic constituent units (A) each having a different structure may be used in combination.
- each of the cationic constituent units may have different structures within the scope represented by the same general structural formula (Ia), (Ib), (IIa), or (IIb), or may have structures from different each other represented by different general structural formulae.
- more than one species of cationic constituent units (A) each represented by general structural formula (Ia) and having a different structure attributed to the difference in the structure of R ⁇ may be used in combination.
- one cationic constituent unit (A) having a structure represented by structural formula (Ia) and another cationic constituent unit (A) having a structure represented by structural formula (IIa) may be used.
- the content of the cationic constituent unit (A) in the amphoteric polymer compound (P) is not particularly limited, the content preferably is an amount corresponding to the copolymerization molar ratio.
- the anionic constituent unit (B) that constitutes the amphoteric polymer compound (P) used in the present invention has a structure represented by the following structural formula (III), (IV), or (V).
- R 4 in formula (III), above is hydrogen or methyl group
- Y in formulae (III), (IV) and (V), above each independently is hydrogen, Na, K, NH 4 , 1 ⁇ 2Ca, 1 ⁇ 2Mg, 1 ⁇ 2Fe, 1 ⁇ 3Al, or 1 ⁇ 3Fe for each carboxy group to which they are bonded,.
- amphoteric polymer compound (P) a single species of the anionic constituent unit (B) may solely be used, and more than one species of the anionic constituent units (B) each having a structure different from each other may be used in combination.
- each of the anionic constituent units may have a different structure within the scope represented by the same structural formula (III), (IV), or (V), or may have structures deferent from each other represented by different general structural formulae.
- more than one species of anionic constituent units (B) each represented by the formula (III) and having a different structure attributed to the difference in the element of Y may be used in combination.
- one anionic constituent unit (B) having a structure represented by structural formula (III) and another anionic constituent unit (B) having a structure represented by structural formula (IV) may be used.
- At least a part of the anionic constituent unit (B) is preferably derived from maleic acid.
- the anionic constituent unit (B) has a structure represented by the formula (IV) in which both Y are hydrogen.
- the content of the anionic constituent unit (B) in the amphoteric polymer compound (P) is not particularly limited, the content preferably is an amount corresponding to the aforementioned molar ratio in copolymerization.
- the constituent unit (C) that constitutes the amphoteric polymer compound (P) used in the present invention has a structure represented by the formula (VI):
- the constituent unit (C) can be introduced into the polymer by using sulfur dioxide as a monomer.
- the content of the constituent unit (C) in the amphoteric polymer compound (P) is not particularly limited, it preferably is an amount corresponding to the aforementioned molar ratio the in copolymerization.
- the amphoteric polymer compound (P) can be produced by copolymerizing a cationic monomer ( ⁇ ), an anionic monomer ( ⁇ ), described later, and sulfur dioxide.
- the copolymerization is quantitatively performed, and therefore the copolymerization ratio of the aforementioned constituent units (A), (B) and (C) is substantially the same as the ratio of the monomers ( ⁇ ), ( ⁇ ) and sulfur dioxide as charged.
- a specific cationic monomer (a) can be used to introduce the cationic constituent unit (A).
- the cationic monomer ( ⁇ ) has a structure represented by the following structural formula (VII), a structure corresponding to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (VIII):
- R 5 in formula (VII), above is hydrogen atom, methyl group, ethyl group, or benzyl group
- R 6 and R 7 in formula (VIII), above each independently are hydrogen atom, methyl group, ethyl group, or benzyl group
- Z ⁇ in formula (VIII), above, is a counter ion.
- examples of the cationic monomer ( ⁇ ) include diallylamines such as diallylamine, N-hydrocarbon group-substituted diallylamines and diallyldialkylammonium salts (namely, compounds having a diallylamine skeleton).
- diallylamines such as diallylamine, N-hydrocarbon group-substituted diallylamines and diallyldialkylammonium salts (namely, compounds having a diallylamine skeleton).
- Diallyldialkylammonium salts are preferable because the anti-corrosive agent is easily dissolved in the acid solution, and therefore the acid detergent solution composition can easily be prepared.
- N-hydrocarbon group-substituted diallylamines used in the present invention include N-methyldiallylamine, N-ethyldiallylamine and N-benzyldiallylamine.
- the cationic monomer ( ⁇ ) is diallylamine or N-hydrocarbon group-substituted diallylamines
- an inorganic acid salt such as hydrochloric acid salts, sulfuric acid salts, nitric acid salts, and phosphoric acid salts
- an organic acid, salt such as acetic acid salts, of each amines
- diallyldialkylammonium salts used in the present invention include, but not limited to, chlorinated diallyldimethylammonium (diallyldimethylammonium chloride), diallyldimethylammonium bromide, diallyldimethylammonium iodide, diallyldimethylammonium methyl sulfate, diallyldimethylammonium ethyl sulfate, diallyldiethylammonium chloride, diallyldiethylammonium bromide, diallyldiethylammonium iodide, diallyldiethylammonium methyl sulfate, diallyldiethylammonium ethyl sulfate, diallylethylmethylammonium chloride, diallylethylmethylammonium bromide, diallylethylmethylammonium iodide, diallylethylmethylammonium methyl sulf
- the combination of the groups R 6 and R 7 is preferably dimethyl, diethyl, ethylmethyl, dibenzyl, methylbenzyl, or ethylbenzyl, and the counter ion Z ⁇ is preferably a halogen ion, methylsulfuric acid ion, or ethylsulfuric acid ion, though is not limited thereto.
- anionic monomer ( ⁇ ) can be used to introduce the anionic constituent unit (B).
- the anionic monomer ( ⁇ ) is a monomer selected from the group consisting of itaconic acid, citraconic acid, mesaconic acid, maleic acid, fumaric acid, and methylenemalonic acid, and compounds in which the hydrogens in the carboxyl groups in these acids are entirely or partially substituted with at least one species selected from the group consisting of Na, K, NH 4 , 1 ⁇ 2Ca, 1 ⁇ 2Mg, 1 ⁇ 2Fe, 1 ⁇ 3Al, and 1 ⁇ 3Fe.
- anionic monomer ( ⁇ ) fumaric acid, maleic acid, citraconic acid, itaconic acid, a sodium salt thereof, a potassium salt thereof, an ammonium salt thereof or the like can be used.
- a particularly preferable amphoteric polymer compound is a copolymer obtainable by using at least one of the diallyldimethylammonium salts as the cationic monomer ( ⁇ ) and copolymerizing the diallyldimethylammonium salt with at least one anionic monomer ( ⁇ ) selected from fumaric acid, maleic acid, itaconic acid, and citraconic acid and sulfur dioxide.
- amphoteric polymer compound (P) used in the present invention a method for producing the amphoteric polymer compound (P) used in the present invention will be described. While the method for producing the amphoteric polymer compound (P) used in the present invention is not particularly limited, it is preferably produced according to the method described below.
- the cationic monomer ( ⁇ ), the anionic monomer ( ⁇ ), and sulfur dioxide are mixed in a polar solvent.
- the cationic monomer ( ⁇ ), the anionic monomer ( ⁇ ), and sulfur dioxide are subjected to a copolymerization reaction in the presence of a polymerization catalyst.
- the molar ratio of cationic monomer ( ⁇ )/anionic monomer ( ⁇ ) is preferably 10/1 to 1/3, more preferably 8/1 to 1/2 and particularly preferably 6/1 to 1/1 as described above.
- the molar ratio of cationic monomer ( ⁇ )/sulfur dioxide monomer is preferably 1/1 to 1/0.01, more preferably 1.1/1 to 1/0.025 and particularly preferably 1.3/1 to 1/0.05 as described above.
- the molar ratio of anionic monomer ( ⁇ )/sulfur dioxide monomer is preferably 20/1 to 1/20, more preferably 15/1 to 1/15 and particularly preferably 10/1 to 1/10 as described above.
- the polar solvent can include water, methanol, ethanol, dimethyl sulfoxide, dimethylformamide and mixed solvents thereof. Among these, water is preferable from the viewpoint of polymerization reactivity and safety.
- a fourth monomer that is a monomer not corresponding to any of the cationic monomer ( ⁇ ), the anionic monomer ( ⁇ ) and sulfur dioxide, such as monoallylamine and acrylamide may be used in a proportion of, for example 15 mol % or less, preferably 10 mol % or less, and more preferably 5 mol % or less based on the total monomers.
- the concentration of the monomer in the reaction solution during the polymerization of amphoteric polymer compound (P) varies depending on the species of the monomer, it is usually 10 to 75 mass %, preferably 30 to 70 mass %, and more preferably 50 to 65 mass %.
- the copolymerization reaction is usually a radical polymerization reaction performed in the presence of a radical polymerization catalyst.
- the kind of the radical polymerization catalyst is not particularly limited, and preferable examples thereof include peroxides such as t-butyl hydroperoxide; persulfates, such as ammonium persulfate, sodium persulfate, and potassium persulfate and water-soluble azo compounds such as azobis compounds and diazo compuonds.
- the amount of the radical polymerization catalyst to be added is usually 0.1 to 20 mol %, and preferably 1.0 to 10 mol %, based on the total monomers.
- the polymerization temperature is usually 0 to 100° C., and preferably 5 to 80° C.
- the polymerization time is usually 20 to 150 hours, and preferably 30 to 100 hours.
- the polymerization atmosphere may be in the air because polymerizability is not significantly affected. Alternatively, the polymerization can be performed under an atmosphere of an inert gas such as nitrogen.
- a second anti-corrosive agent for washing of a metal with an acid comprises an amphoteric polymer compound (P′) obtainable by copolymerizing at least one species of the cationic monomers ( ⁇ ), at least one species of the anionic monomers ( ⁇ ) and sulfur dioxide.
- the cationic monomer ( ⁇ ), the anionic monomer ( ⁇ ) and sulfur dioxide are the same as those described above.
- “comprise” is used with the same intention as that described with respect to the first anti-corrosive agent for washing of a metal with an acid of the present invention.
- the amphoteric polymer compound (P′) may be that corresponding to the amphoteric polymer compound (P).
- the anti-corrosive agent for washing of a metal with an acid according to the present invention may be entirely constituted of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′), or may be partially constituted of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′). Accordingly, after the polymerization is completed, the amphoteric polymer compound (P) or the amphoteric polymer compound (P′) may be used as the anti-corrosive agent for washing of a metal with an acid of the present invention by using the solution after completion of the polymerization as it is. Alternatively, an organic solvent such as acetone may be added to the solution after completion of the polymerization to reprecipitate, solidify and use the compound as the anti-corrosive agent.
- an organic solvent such as acetone may be added to the solution after completion of the polymerization to reprecipitate, solidify and use the compound as the anti-corrosive agent.
- the detergent solution composition of the present invention contains the anti-corrosive agent for washing of a metal with an acid of the present invention in an amount of usually 0.1 to 50000 mg, preferably 1 to 10000 mg, and more preferably 1 to 5000 mg based on 1 L of the acid solution in terms of a solid or pure compound of amphoteric polymer compound (P) or amphoteric polymer compound (P′).
- a necessary anti-corrosion effect can be obtained as the content is 0.1 mg or more based on 1 L of the acid solution.
- the anti-corrosion effect can be improved corresponding to the amount of the anti-corrosive agent for washing of a metal with an acid to be added as the content is 50000 mg or less.
- the acid used for the acid solution is not particularly limited, inorganic acids such as hydrochloric acid, sulfuric acid, sulfamic acid and hydrofluoric acid; organic acids such as formic acid, oxalic acid, citric acid, malic acid, hydroxyacetic acid and gluconic acid; and chelating agents such as ethylenediaminetetraacetic acid are preferable.
- inorganic acids such as hydrochloric acid, sulfuric acid, sulfamic acid and hydrofluoric acid
- organic acids such as formic acid, oxalic acid, citric acid, malic acid, hydroxyacetic acid and gluconic acid
- chelating agents such as ethylenediaminetetraacetic acid
- the anti-corrosive agent of the present invention may be added to the acid solution when it is used. Alternatively, it may be added to the acid solution in advance to prepare the detergent solution composition of the present invention and then be used directly or used following the dilution with water. Further, a surfactant or a solvent may be used in order to improve the mixing with the detergent solution. The surfactant or solvent used for this purpose may be mixed with the anti-corrosive agent of the present invention in advance, or may be added to the detergent solution composition of the present invention separately.
- the anti-corrosive agent according to the present invention may be used in combination with another anti-corrosive agent.
- the other anti-corrosive agent may be mixed with the anti-corrosive agent of the present invention in advance, or may be added to the detergent solution composition of the present invention separately.
- anti-corrosive agent used in combination include, but not limited to, 1-vinyl-3-ethylimidazolinium bromide, 3-ethylbenzothiazolium bromide and ethyltriethanolammonium bromide.
- an acid washing accelerator such as sulfites, for improving the acid washing rate may be used in combination.
- the method for washing of metal of the present invention is characterized in that the detergent solution composition of the present invention is sprayed to a surface of the metal or the surface of the metal is immersed in the detergent solution composition to wash the surface of the metal.
- the detergent solution composition containing the anti-corrosive agent according to the present invention is sprayed to the surface of the metal to be washed or a metal piece to be washed is immersed in the detergent solution composition to wash the surface of the metal. While the metal to be washed is not particularly limited, the method is particularly effective when applied to steel.
- DADMAC an abbreviation for diallyldimethylammonium chloride
- MA an abbreviation for maleic acid
- SO 2 an abbreviation for sulfur dioxide
- AMPS an abbreviation for 2-acrylamide-2-methylpropanesulfonic acid
- DA.HCl an abbreviation for diallylaminehydrochloric acid salt
- the weight average molecular weight and polymerization rate of the copolymer were measured by gel permeation chromatography (GPC) using a Hitachi L-6000 high speed liquid chromatograph.
- GPC gel permeation chromatography
- a Hitachi L-6000 was used as an eluent flow path pump, and a Shodex RI SE-61 differential refractive index detector was used as a detector.
- As a column an Asahipak aqueous gel filtration type GS-220HQ (exclusion limit molecular weight of 3,000) and GS-620HQ (exclusion limit molecular weight of 2,000,000) were doubly connected and used.
- a sample was adjusted with an eluent to have a concentration of 0.5 g/100 mL, and 20 ⁇ L of the sample was used.
- As the eluent a 0.4 mol/L sodium chloride aqueous solution was used. The measurement was performed at the column temperature of 30° C. and the flow rate of 1.0 mL/min.
- Polyethylene glycols having the molecular weights of 106, 194, 440, 600, 1470, 4100, 7100, 10300, 12600, 23000, and the like were used as standard samples, and calibration curves were determined. Based on the calibration curves, the weight average molecular weight of the copolymer was determined.
- copolymers specified in the title an to be used in Examples 2 to 4 were synthesized by the same operation as that in Synthesis Example 1 except that the copolymerization ratio of diallyldimethylammonium chloride, maleic acid and sulfur dioxide was changed as below.
- Synthesis Example 2 (copolymerization ratio of 10:4:1), the weight-average molecular weight was 24,000 and the polymerization rate was 100%.
- Synthesis Example 3 (copolymerization ratio of 10:3.5:1.5), the weight-average molecular weight was 23,000 and the polymerization rate was 100%.
- Synthesis Example 4 (copolymerization ratio of 10:2:3), the weight-average molecular weight was 23,000 and the polymerization rate was 100%.
- the copolymer specified in the title and to be used in Comparative Example 2 was produced by the same operation as that in Comparative Synthesis Example 1 except that the copolymerization ratio of diallyldimethylammonium chloride and maleic acid was changed.
- the weight average molecular weight was 24,000, and the polymerization rate was 100%.
- a detergent solution aqueous solution comprising a 3.5 mass % hydrochloric acid aqueous solution (hereinafter, referred to an “acid solution”)
- an acid solution a detergent solution aqueous solution comprising a 3.5 mass % hydrochloric acid aqueous solution
- each of the copolymers produced in Synthesis Examples and Comparative Synthesis Examples was added in an amount of 50 mg or1000 mg (in terms of the solid content) according to Table 1 to obtain a detergent solution composition.
- the detergent solution composition prepared by the method, above, was heated to 80° C. Then, a hot-rolled steel sheet (JIS3131) polished with a #180 waterproof polishing paper was immersed in the detergent solution composition for 10 minutes. From the surface area of the test piece and measurement results of the weight of the test piece before and after the immersion, the amount of corrosion was calculated according to the following expression (1).
- the corrosion suppression rate was calculated according to the following expression (2).
- the performance deterioration rate was calculated according to the following expression (3).
- the anti-corrosive agent for washing of a metal with an acid according to the present invention has high solubility in the acid solution. Additionally, it turned out that the anti-corrosive agent for washing of a metal with an acid according to the present invention has a high corrosion suppression rate both in the concentrations of the added amounts of 50 mg and 1000 mg and furthermore that the corrosion suppression rate changes little even when the concentration changes and that the performance deterioration rate is small.
- the anti-corrosive agent for washing of a metal with an acid according to the present invention and the detergent solution composition and washing method using the same demonstrate a high anti-corrosion effect in acid washing of various surfaces of metals and show little change in the anti-corrosion effect even when the concentration of the anti-corrosive agent changes. Accordingly, the present invention is highly valuable and has high applicability in a variety of industries such as the metal industries.
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Abstract
An anti-corrosive agent for washing of a metal with an acid, which comprises an amphoteric polymeric compound (P) having at least one cationic constituent unit (A) having a specific structure, at least one anionic constituent unit (B) having a specific structure and a specific sulfur-containing constituent unit (C).
Description
- The present invention relates to an anti-corrosive agent for washing of a metal with an acid that is excellent in anti-corrosion effect and stability and its applications.
- Surfaces of the metals such as metal steel sheets have black oxide coating such as mill scale adhering thereon. For this reason, when a treatment such as an anti-corrosive treatment and plating is performed on metal steel sheet or the like in order to improve the performance of the final product, it is widely performed that the oxide coating is removed before the treatment, thereby giving anti-corrosiveness uniformly onto the surface of the steel sheet or improving adhesion between the surface of the steel sheet and plating coating or the like.
- To remove scale or rust, acid washing using an acid detergent solution for a metal (hereinafter, also referred to as an “acid solution”) is usually performed. Examples of the acid detergent solution for a metal include aqueous solutions of inorganic acids such as sulfuric acid, hydrochloric acid and nitric acid; organic acids such as phosphoric acid, sulfamic acid, hydrofluoric acid, oxalic acid, citric acid, glycolic acid and formic acid; chelating agents such as ethylenediaminetetraacetic acid and mixtures thereof. As scale, rust and so on usually extremely strongly adhere to the surface of metal, the acid washing using the acid detergent solution for the metal needs a considerably long time to completely remove them. Moreover, when the acid washing is performed, not only the scale and rust but also the metallic substrate is dissolved and corroded. In this view, anti-corrosive agents to be added to the acid have been used in order to solve such a problem. For example, nitrogen-containing organic compounds are representative examples of such anti-corrosive agents.
- As the nitrogen-containing organic compound used as an anti-corrosive agent, quaternary ammonium salts are known (for example, see Patent Document 1). As such quaternary ammonium salts, 1-vinyl-3-ethylimidazolinium bromide, 3-ethylbenzothiazolium bromide, ethyltriethanolammonium bromide and the like are used. It is known that, in addition to these quaternary ammonium salts, a nitrogen-containing organic compound other than the quaternary ammonium salts is concurrently used. For example, hexamethylenetetramine can be used (Patent Document 1). Such a nitrogen-containing organic compound has a detrimental effect of reducing the acid washing rate. Accordingly, when a nitrogen-containing organic compound of these is contained in an acid detergent solution for a metal, the acid washing time becomes further longer, and the deterioration in working efficiency cannot be avoided. Also, the anti-corrosion effect thereof is not sufficiently satisfying.
- As the nitrogen-containing organic compound acting as the anti-corrosive agent, thiourea and derivatives thereof have also been proposed (for example, see Patent Document 2). Unfortunately, thiourea and derivatives thereof also have drawbacks similar to those of the quaternary ammonium salts.
- Meanwhile, as the nitrogen-containing organic compound acting as an anti-corrosive agent, homopolymers of quaternary ammonium salt-substituted vinyl compounds and cationic polymers such as polyamine compounds having a cationic constituent unit and a sulfur dioxide unit (for example, see Patent Document 3) are known. Among these, the polyamine compounds have an anti-corrosion effect higher than that of the conventional nitrogen-containing organic compound, and are useful as an additive for the acid detergent solution for a metal, However, attempts to shorten the acid washing time for the efficiency in the acid washing have been made recently. For this reason, the content of the acid in the acid detergent solution for a metal has been increased, and therefore development of an anti-corrosive agent having a higher anti-corrosion effect has been demanded.
- Moreover, in order to suppress the corrosion effectively, usage of a plurality of anti-corrosive agents for a metal in combination can be considered. In this case, the concentration ratio among the respective anti-corrosive agents changes along with the progress of the usage, and the anti-corrosion effect is likely to change, which may lead to fluctuation in the property of the final products.
- Moreover, the copolymers having a cationic constituent unit and a sulfur dioxide unit currently in use may also change in the anti-corrosion effect as the concentration thereof changes. So, if the concentration of the anti-corrosive agent contained in the acid detergent solution for a metal using such a copolymer changes over the time, the problem of the fluctuation in the property of the final products may be caused therefrom.
- Patent Document 1: JP 61-037988 A
- Patent Document 2: JP 11-050280 A
- Patent Document 3: JP 2000-96049 A
- In consideration of background arts, above, the present inventors attempted to develop an anti-corrosive agent for washing of a metal with an acid in which an anti-corrosion effect is high in acid washing of a surface of a metal, and change in an anti-corrosion effect is small even if the concentration of the anti-corrosive agent changes. As a result, unexpectedly, it was found that the problem can be solved by using an amphoteric polymer compound having a specific cationic constituent unit, a specific anionic constituent unit, and a constituent unit derived from sulfur dioxide. Namely, an object of the present invention is to provide an anti-corrosive agent for washing of a metal with an acid in which an anti-corrosion effect is high in acid washing of a surface of a metal, and change in an anti-corrosion rate is small even if the concentration of the anti-corrosive agent changes.
- Namely, the present invention relates to any of (1) to (7) below:
- (1) An anti-corrosive agent for washing of a metal with an acid, comprising an amphoteric polymer compound (P) having:
- at least one cationic constituent unit (A) having a structure represented by the following structural formula (Ia) or (Ib), a structure corresponds to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (IIa) or (IIb):
- wherein R1 in formulae (Ia) and (Tb), above, is hydrogen atom, methyl group, ethyl group, or benzyl group; R2 and R3 in formulae (IIa) and (IIb), above, each independently are hydrogen atom, methyl group, ethyl group, or benzyl group; and X− in formulae (IIa) and (IIb), above, is a counter ion;
- at least one anionic constituent unit (B) represented by the following structural formula (III), (IV) or (V):
- wherein R4 in formula (III), above, is hydrogen or methyl group; and Y in formulae (III), (IV) and (V), above, each independently are hydrogen, Na, K, NH4, ½Ca, ½Mg, ½Fe, ⅓Al, or ⅓Fe for each carboxy group to which they are bonded; and
- a constituent unit (C) represented by the following structural formula (VI):
- (2) The anti-corrosive agent according to (1), wherein the counter ion X− is an anion derived from an organic acid or an inorganic acid.
(3) The anti-corrosive agent according to (1), wherein at least a part of the cationic constituent unit (A) is derived from a cationic monomer selected from the group consisting of diallylamines and inorganic acid salts and organic acid salts thereof.
(4) The anti-corrosive agent according to (1), wherein at least a part of the cationic constituent unit (A) is derived from diallyldimethylammonium chloride and at least part of the anionic constituent unit (B) is derived from maleic acid.
(5) An anti-corrosive agent for washing of a metal with an acid, comprising an amphoteric polymer compound (P′) obtainable by copolymerizing: - at least one monomer (α) having a structure represented by the following structural formula (VII), a structure corresponding to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (VIII):
- wherein R5 in formula (VII), above, is hydrogen atom, methyl group, ethyl group, or benzyl group; R6 and R7 in formula (VIII), above, each independently are hydrogen atom, methyl group, ethyl group, or benzyl group; and Z− in formula (VIII), above, is a counter ion);
- at least one monomer (β) selected from the group consisting of itaconic acid, citraconic acid, mesaconic acid, maleic acid, fumaric acid, methylenemalonic acid and compounds in which the hydrogens in the carboxyl groups in these acids are entirely or partially substituted with at least one species selected from the group consisting of Na, K, NH4, ½Ca, ½Mg, ½Fe, ⅓Al, and ⅓Fe; and
- sulfur dioxide.
- (6) A detergent solution composition comprising an acid solution and an anti-corrosive agent according to any one of (1) to (5), wherein the content of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′) is 0.1 to 50000 mg based on 1 L of the acid solution.
(7) A method for washing a metal, characterized in that the detergent solution composition according to (6) is sprayed to the surface of the metal or the surface of the metal is immersed in the detergent solution composition to carry out the washing. - The anti-corrosive agent for washing of a metal with an acid according to the present invention can effectively suppress corrosion of a metal when the surface of the metal is acid washed. Additionally, in the anti-corrosive agent for washing of a metal with an acid according to the present invention, change in the anti-corrosion rate is extremely small even if the concentration of the anti-corrosive agent changes, and therefore quality of the final product can easily be kept constant, As a result, the anti-corrosive agent for washing of a metal with an acid according to the present invention makes great contribution to the development of a variety of industries such as the field of metal industries.
- Amphoteric Polymer Compound (P)
- A first anti-corrosive agent for washing of a metal with an acid according to the present invention comprises an amphoteric polymer compound (P) having:
- at least one cationic constituent unit (A) having a structure represented by the following structural formula (Ia) or (Ib), a structure corresponding to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (IIa) or (IIb):
- wherein R1 in formulae (Ia) and (Ib), above, is hydrogen atom, methyl group, ethyl group, or benzyl group; R2 and R3 in formulae (IIa) and (IIb), above, each independently are hydrogen atom, methyl group, ethyl group, or benzyl group; and X− in formulae (IIa) and (IIb), above, is a counter ion;
- at least one anionic constituent unit (B) represented by the following structural formula (III), (IV) or (V):
- wherein R4 in formula (III), above, is hydrogen or methyl group and Y in formulae (III), (IV) and (V) each independently are hydrogen, Na, K, NH4, ½Ca, ½Mg, ½Fe, ⅓Al, or ⅓Fe for each carboxy group to which they are bonded; and
- a constituent unit (C) represented by the following structural formula (VI):
- Here, “comprise” is used with an intention that the term includes both cases that the entirety of the first anti-corrosive agent for washing of a metal with an acid according to the present invention is constituted of the amphoteric polymer compound (P) and that a part of the first anti-corrosive agent for washing of a metal with an acid according to the present invention is constituted of the amphoteric polymer compound (P).
- As long as the advantageous effects of the present invention are not impaired, the amphoteric polymer compound (P) used in the present invention may include a fourth constituent unit that is a constituent unit not corresponding to any of the cationic constituent unit (A), the anionic constituent unit (B) and the constituent unit (C), a constituent unit derived from a monomer such as monoallylamine and acrylamide for example. The constituent unit derived from a monomer such as monoallylamine and acrylamide may be included in a proportion of 15 mol % or less, preferably 10 mol % or less, and more preferably 5 mol % or less based on the total constituent units, for example.
- In the amphoteric polymer compound (P), the molar ratio of cationic constituent units (A)/anionic constituent units (B) in the copolymerization is preferably 10/1 to 1/3, more preferably 8/1 to 1/2, and particularly preferably 6/1 to 1/1. In the amphoteric polymer compound (P), the molar ratio of the cationic constituent unit (A)/constituent unit derived from sulfur dioxide (C) in the copolymerization is preferably 1/1 to 1/0.01, more preferably 1.1/1 to 1/0.025, and particularly preferably 1.3/1 to 1/0.05. Furthermore, in the amphoteric polymer compound (P), the copolymerization ratio of the anionic constituent unit (B)/constituent unit derived from sulfur dioxide (C) is preferably 20/1 to 1/20, more preferably 15/1 to 1/15, and particularly preferably 10/1 to 1/10. The amphoteric polymer compound (P) usually has a molecular weight of 1,000 to 10,000,000, preferably 3,000 to 1,000,000, more preferably 5,000 to 100,000, still more preferably 10,000 to 50,000, and particularly preferably 15,000 to 30,000.
- Cationic Constituent Unit (A)
- The cationic constituent unit (A) that constitutes the amphoteric polymer compound (P) used in the present invention has a structure represented by the following structural formula (Ia) or (Ib), a structure corresponding to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (IIa) or (IIb).
- wherein R− in formulae (Ia) and (Ib), above, is hydrogen atom, methyl group, ethyl group, or benzyl group; R2 and R3 in formulae (IIa) and (IIb), above, each independently are hydrogen atom, methyl group, ethyl group, or benzyl group and X in formulae (IIa) and (IIb), above, is a counter ion. X− is preferably an anion derived from an organic acid or an inorganic acid, and particularly preferably a halogen ion (more preferably, Cl−, Br−, or I−), methylsulfuric acid ion, ethylsulfuric acid ion or acetate ion.
- At least a part of the cationic constituent unit (A) is preferably derived from a cationic monomer selected from the group consisting of diallylamines and inorganic acid salts and organic acid salts thereof. At least a part of the cationic constituent unit (A) is particularly preferably a constituent unit derived from diallyldimethylammonium chloride.
- In the amphoteric polymer compound (P), a single species of the cationic constituent unit (A) may solely be used, and more than one species of the cationic constituent units (A) each having a different structure may be used in combination.
- In the case where more than one species of the cationic constituent units (A) each having a different structure are used in combination, each of the cationic constituent units may have different structures within the scope represented by the same general structural formula (Ia), (Ib), (IIa), or (IIb), or may have structures from different each other represented by different general structural formulae. In the former case, for example, more than one species of cationic constituent units (A) each represented by general structural formula (Ia) and having a different structure attributed to the difference in the structure of R− may be used in combination. In the latter case, for example, one cationic constituent unit (A) having a structure represented by structural formula (Ia), and another cationic constituent unit (A) having a structure represented by structural formula (IIa) may be used.
- while the content of the cationic constituent unit (A) in the amphoteric polymer compound (P) is not particularly limited, the content preferably is an amount corresponding to the copolymerization molar ratio.
- Anionic Constituent Unit (B)
- The anionic constituent unit (B) that constitutes the amphoteric polymer compound (P) used in the present invention has a structure represented by the following structural formula (III), (IV), or (V).
- wherein R4 in formula (III), above, is hydrogen or methyl group; and Y in formulae (III), (IV) and (V), above, each independently is hydrogen, Na, K, NH4, ½Ca, ½Mg, ½Fe, ⅓Al, or ⅓Fe for each carboxy group to which they are bonded,.
- In the amphoteric polymer compound (P), a single species of the anionic constituent unit (B) may solely be used, and more than one species of the anionic constituent units (B) each having a structure different from each other may be used in combination.
- In the case where more than one species of the anionic constituent units (B) each having a structure different from each other are used in combination, each of the anionic constituent units may have a different structure within the scope represented by the same structural formula (III), (IV), or (V), or may have structures deferent from each other represented by different general structural formulae. In the former case, for example, more than one species of anionic constituent units (B) each represented by the formula (III) and having a different structure attributed to the difference in the element of Y may be used in combination. In the latter case, for example, one anionic constituent unit (B) having a structure represented by structural formula (III) and another anionic constituent unit (B) having a structure represented by structural formula (IV) may be used.
- At least a part of the anionic constituent unit (B) is preferably derived from maleic acid. In this case, the anionic constituent unit (B) has a structure represented by the formula (IV) in which both Y are hydrogen.
- While the content of the anionic constituent unit (B) in the amphoteric polymer compound (P) is not particularly limited, the content preferably is an amount corresponding to the aforementioned molar ratio in copolymerization.
- Constituent Unit (C)
- The constituent unit (C) that constitutes the amphoteric polymer compound (P) used in the present invention has a structure represented by the formula (VI):
- Usually, the constituent unit (C) can be introduced into the polymer by using sulfur dioxide as a monomer. While the content of the constituent unit (C) in the amphoteric polymer compound (P) is not particularly limited, it preferably is an amount corresponding to the aforementioned molar ratio the in copolymerization.
- Usually, the amphoteric polymer compound (P) can be produced by copolymerizing a cationic monomer (α), an anionic monomer (β), described later, and sulfur dioxide. In this case, the copolymerization is quantitatively performed, and therefore the copolymerization ratio of the aforementioned constituent units (A), (B) and (C) is substantially the same as the ratio of the monomers (α), (β) and sulfur dioxide as charged.
- Cationic Monomer (a)
- In the production of the amphoteric polymer compound (P) used in the present invention, a specific cationic monomer (a) can be used to introduce the cationic constituent unit (A).
- The cationic monomer (α) has a structure represented by the following structural formula (VII), a structure corresponding to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (VIII):
- wherein R5 in formula (VII), above, is hydrogen atom, methyl group, ethyl group, or benzyl group; R6 and R7 in formula (VIII), above, each independently are hydrogen atom, methyl group, ethyl group, or benzyl group; and Z− in formula (VIII), above, is a counter ion.
- More specifically, examples of the cationic monomer (α) include diallylamines such as diallylamine, N-hydrocarbon group-substituted diallylamines and diallyldialkylammonium salts (namely, compounds having a diallylamine skeleton). Diallyldialkylammonium salts are preferable because the anti-corrosive agent is easily dissolved in the acid solution, and therefore the acid detergent solution composition can easily be prepared.
- Examples of the N-hydrocarbon group-substituted diallylamines used in the present invention include N-methyldiallylamine, N-ethyldiallylamine and N-benzyldiallylamine.
- In the case where the cationic monomer (α) is diallylamine or N-hydrocarbon group-substituted diallylamines, an inorganic acid salt, such as hydrochloric acid salts, sulfuric acid salts, nitric acid salts, and phosphoric acid salts, and an organic acid, salt such as acetic acid salts, of each amines may be used as a starting monomer for the copolymerization.
- Examples of the diallyldialkylammonium salts used in the present invention include, but not limited to, chlorinated diallyldimethylammonium (diallyldimethylammonium chloride), diallyldimethylammonium bromide, diallyldimethylammonium iodide, diallyldimethylammonium methyl sulfate, diallyldimethylammonium ethyl sulfate, diallyldiethylammonium chloride, diallyldiethylammonium bromide, diallyldiethylammonium iodide, diallyldiethylammonium methyl sulfate, diallyldiethylammonium ethyl sulfate, diallylethylmethylammonium chloride, diallylethylmethylammonium bromide, diallylethylmethylammonium iodide, diallylethylmethylammonium methyl sulfate, diallylethylmethylammonium ethyl sulfate, diallylmethylbenzylammonium chloride, diallylmethylbenzylammonium bromide, diallylmethylbenzylammonium iodide, diallylmethylbenzylammonium methyl sulfate, diallylmethylbenzylammonium ethyl sulfate, diallylethylbenzylammonium chloride, diallylethylbenzylammonium bromide, diallylethylbenzylammonium iodide, diallylethylbenzylammonium methyl sulfate, diallylethylbenzylammonium ethyl sulfate, diallyldibenzylammonium chloride, diallyldibenzylammonium bromide, diallyldibenzylammonium iodide, diallyldibenzylammonium methyl sulfate, and diallyldibenzylammonium ethyl sulfate. Namely, in the formula (VIII), above, the combination of the groups R6 and R7 is preferably dimethyl, diethyl, ethylmethyl, dibenzyl, methylbenzyl, or ethylbenzyl, and the counter ion Z− is preferably a halogen ion, methylsulfuric acid ion, or ethylsulfuric acid ion, though is not limited thereto.
- Anionic Monomer (β)
- In production of the amphoteric polymer compound (P) used in the present invention, anionic monomer (β) can be used to introduce the anionic constituent unit (B).
- The anionic monomer (β) is a monomer selected from the group consisting of itaconic acid, citraconic acid, mesaconic acid, maleic acid, fumaric acid, and methylenemalonic acid, and compounds in which the hydrogens in the carboxyl groups in these acids are entirely or partially substituted with at least one species selected from the group consisting of Na, K, NH4, ½Ca, ½Mg, ½Fe, ⅓Al, and ⅓Fe.
- More preferably, as the anionic monomer (β), fumaric acid, maleic acid, citraconic acid, itaconic acid, a sodium salt thereof, a potassium salt thereof, an ammonium salt thereof or the like can be used.
- Among the amphoteric polymer compounds (P) used in the present invention, a particularly preferable amphoteric polymer compound is a copolymer obtainable by using at least one of the diallyldimethylammonium salts as the cationic monomer (α) and copolymerizing the diallyldimethylammonium salt with at least one anionic monomer (β) selected from fumaric acid, maleic acid, itaconic acid, and citraconic acid and sulfur dioxide.
- Production of Amphoteric Polymer Compound (P)
- Next, a method for producing the amphoteric polymer compound (P) used in the present invention will be described. While the method for producing the amphoteric polymer compound (P) used in the present invention is not particularly limited, it is preferably produced according to the method described below.
- First, the cationic monomer (α), the anionic monomer (β), and sulfur dioxide are mixed in a polar solvent. Next, in the polar solvent, the cationic monomer (α), the anionic monomer (β), and sulfur dioxide are subjected to a copolymerization reaction in the presence of a polymerization catalyst. The molar ratio of cationic monomer (α)/anionic monomer (β) is preferably 10/1 to 1/3, more preferably 8/1 to 1/2 and particularly preferably 6/1 to 1/1 as described above. The molar ratio of cationic monomer (α)/sulfur dioxide monomer is preferably 1/1 to 1/0.01, more preferably 1.1/1 to 1/0.025 and particularly preferably 1.3/1 to 1/0.05 as described above. The molar ratio of anionic monomer (β)/sulfur dioxide monomer is preferably 20/1 to 1/20, more preferably 15/1 to 1/15 and particularly preferably 10/1 to 1/10 as described above. Examples of the polar solvent can include water, methanol, ethanol, dimethyl sulfoxide, dimethylformamide and mixed solvents thereof. Among these, water is preferable from the viewpoint of polymerization reactivity and safety.
- In the production of the amphoteric polymer compound (P) used in the present invention, as long as the advantageous effects of the present invention are not impaired, a fourth monomer that is a monomer not corresponding to any of the cationic monomer (α), the anionic monomer (β) and sulfur dioxide, such as monoallylamine and acrylamide may be used in a proportion of, for example 15 mol % or less, preferably 10 mol % or less, and more preferably 5 mol % or less based on the total monomers.
- While the concentration of the monomer in the reaction solution during the polymerization of amphoteric polymer compound (P) varies depending on the species of the monomer, it is usually 10 to 75 mass %, preferably 30 to 70 mass %, and more preferably 50 to 65 mass %. The copolymerization reaction is usually a radical polymerization reaction performed in the presence of a radical polymerization catalyst. The kind of the radical polymerization catalyst is not particularly limited, and preferable examples thereof include peroxides such as t-butyl hydroperoxide; persulfates, such as ammonium persulfate, sodium persulfate, and potassium persulfate and water-soluble azo compounds such as azobis compounds and diazo compuonds.
- The amount of the radical polymerization catalyst to be added is usually 0.1 to 20 mol %, and preferably 1.0 to 10 mol %, based on the total monomers. The polymerization temperature is usually 0 to 100° C., and preferably 5 to 80° C. The polymerization time is usually 20 to 150 hours, and preferably 30 to 100 hours. The polymerization atmosphere may be in the air because polymerizability is not significantly affected. Alternatively, the polymerization can be performed under an atmosphere of an inert gas such as nitrogen.
- Amphoteric Polymer Compound (P′)
- A second anti-corrosive agent for washing of a metal with an acid according to the present invention comprises an amphoteric polymer compound (P′) obtainable by copolymerizing at least one species of the cationic monomers (α), at least one species of the anionic monomers (β) and sulfur dioxide. Here, the cationic monomer (α), the anionic monomer (β) and sulfur dioxide are the same as those described above. Moreover, “comprise” is used with the same intention as that described with respect to the first anti-corrosive agent for washing of a metal with an acid of the present invention. The amphoteric polymer compound (P′) may be that corresponding to the amphoteric polymer compound (P).
- Anti-Corrosive Agent For Washing of Metal With Acid
- The anti-corrosive agent for washing of a metal with an acid according to the present invention may be entirely constituted of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′), or may be partially constituted of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′). Accordingly, after the polymerization is completed, the amphoteric polymer compound (P) or the amphoteric polymer compound (P′) may be used as the anti-corrosive agent for washing of a metal with an acid of the present invention by using the solution after completion of the polymerization as it is. Alternatively, an organic solvent such as acetone may be added to the solution after completion of the polymerization to reprecipitate, solidify and use the compound as the anti-corrosive agent.
- Detergent Solution Composition
- The detergent solution composition of the present invention contains the anti-corrosive agent for washing of a metal with an acid of the present invention in an amount of usually 0.1 to 50000 mg, preferably 1 to 10000 mg, and more preferably 1 to 5000 mg based on 1 L of the acid solution in terms of a solid or pure compound of amphoteric polymer compound (P) or amphoteric polymer compound (P′). A necessary anti-corrosion effect can be obtained as the content is 0.1 mg or more based on 1 L of the acid solution. The anti-corrosion effect can be improved corresponding to the amount of the anti-corrosive agent for washing of a metal with an acid to be added as the content is 50000 mg or less.
- While the acid used for the acid solution is not particularly limited, inorganic acids such as hydrochloric acid, sulfuric acid, sulfamic acid and hydrofluoric acid; organic acids such as formic acid, oxalic acid, citric acid, malic acid, hydroxyacetic acid and gluconic acid; and chelating agents such as ethylenediaminetetraacetic acid are preferable.
- The anti-corrosive agent of the present invention may be added to the acid solution when it is used. Alternatively, it may be added to the acid solution in advance to prepare the detergent solution composition of the present invention and then be used directly or used following the dilution with water. Further, a surfactant or a solvent may be used in order to improve the mixing with the detergent solution. The surfactant or solvent used for this purpose may be mixed with the anti-corrosive agent of the present invention in advance, or may be added to the detergent solution composition of the present invention separately.
- The anti-corrosive agent according to the present invention may be used in combination with another anti-corrosive agent. The other anti-corrosive agent may be mixed with the anti-corrosive agent of the present invention in advance, or may be added to the detergent solution composition of the present invention separately.
- Specific examples of the other anti-corrosive agent used in combination include, but not limited to, 1-vinyl-3-ethylimidazolinium bromide, 3-ethylbenzothiazolium bromide and ethyltriethanolammonium bromide.
- Further, in the detergent solution composition of the present invention, an acid washing accelerator, such as sulfites, for improving the acid washing rate may be used in combination.
- Method for Washing of Metal
- The method for washing of metal of the present invention is characterized in that the detergent solution composition of the present invention is sprayed to a surface of the metal or the surface of the metal is immersed in the detergent solution composition to wash the surface of the metal.
- The detergent solution composition containing the anti-corrosive agent according to the present invention is sprayed to the surface of the metal to be washed or a metal piece to be washed is immersed in the detergent solution composition to wash the surface of the metal. While the metal to be washed is not particularly limited, the method is particularly effective when applied to steel.
- Hereinafter, the present invention will be described in detail with reference to Examples. The scope of the present invention will not be limited by these Examples in any meaning.
- In Examples, the following abbreviations are used in some cases:
- DADMAC: an abbreviation for diallyldimethylammonium chloride
MA: an abbreviation for maleic acid
SO2: an abbreviation for sulfur dioxide
AMPS: an abbreviation for 2-acrylamide-2-methylpropanesulfonic acid
DA.HCl: an abbreviation for diallylaminehydrochloric acid salt - In Synthesis Examples, the weight average molecular weight and polymerization rate of the copolymer were measured by gel permeation chromatography (GPC) using a Hitachi L-6000 high speed liquid chromatograph. A Hitachi L-6000 was used as an eluent flow path pump, and a Shodex RI SE-61 differential refractive index detector was used as a detector. As a column, an Asahipak aqueous gel filtration type GS-220HQ (exclusion limit molecular weight of 3,000) and GS-620HQ (exclusion limit molecular weight of 2,000,000) were doubly connected and used. A sample was adjusted with an eluent to have a concentration of 0.5 g/100 mL, and 20 μL of the sample was used. As the eluent, a 0.4 mol/L sodium chloride aqueous solution was used. The measurement was performed at the column temperature of 30° C. and the flow rate of 1.0 mL/min. Polyethylene glycols having the molecular weights of 106, 194, 440, 600, 1470, 4100, 7100, 10300, 12600, 23000, and the like were used as standard samples, and calibration curves were determined. Based on the calibration curves, the weight average molecular weight of the copolymer was determined.
- Synthesis Example of 10:5:5 ternary copolymer of diallyldimethylammonium chloride, maleic acid and sulfur dioxide
- In a 500 mL four-necked separable flask equipped with a stirrer, a cooling pipe and a thermometer, 248.7 g (1.0 mol) of a 65 mass % of DADMAC aqueous solution, 58.0 g (0.5 mol) of MA and 32.0 g (0.5 mol) of SO2 were dissolved in 80.8 g of water. Then, 67.1 g of a 28.5 mass % of ammonium persulfate aqueous solution (7.6 mass% based on the monomer; 4.2 mol % based on the total monomers) was added, and polymerization was performed at 18 to 70° C. for 72 hours to synthesize the copolymer specified in the title and to be used in Example 1. The solution after the completion of the polymerization was measured by the GPC method to reveal that the weight-average molecular weight was 23,000 and the polymerization rate was 100%.
- Synthesis Examples of ternary copolymer of diallyldimethylammonium chloride, maleic acid and sulfur dioxide having various copolymerization ratios
- The copolymers specified in the title an to be used in Examples 2 to 4 were synthesized by the same operation as that in Synthesis Example 1 except that the copolymerization ratio of diallyldimethylammonium chloride, maleic acid and sulfur dioxide was changed as below. In Synthesis Example 2 (copolymerization ratio of 10:4:1), the weight-average molecular weight was 24,000 and the polymerization rate was 100%. In Synthesis Example 3 (copolymerization ratio of 10:3.5:1.5), the weight-average molecular weight was 23,000 and the polymerization rate was 100%. In Synthesis Example 4 (copolymerization ratio of 10:2:3), the weight-average molecular weight was 23,000 and the polymerization rate was 100%.
- Synthesis Example of 1:1 binary copolymer of diallyldimethylammonium chloride and maleic acid
- In a 500 mL four-necked separable flask equipped with a stirrer, a cooling pipe and a thermometer, 116.1 g (1.0 mol) of MA was dissolved in 248.7 g (1.0 mol) of 65 mass % DADMAC aqueous solution, and the internal temperature was raised to 50° C. After the temperature was stabilized, 67.1 g of a 28.5 mass % ammonium persulfate aqueous solution was added to the obtained dissolution solution, and polymerization was performed at 50 to 70° C. for 72 hours to synthesize the copolymer specified in the title and to be used in Comparative Example 1. The solution after the completion of the polymerization was measured by the GPC method to reveal that the weight average molecular weight was 11,800 and the polymerization rate was 100%.
- Synthesis Example of 2:1 binary copolymer of diallyldimethylammonium chloride and maleic acid
- The copolymer specified in the title and to be used in Comparative Example 2 was produced by the same operation as that in Comparative Synthesis Example 1 except that the copolymerization ratio of diallyldimethylammonium chloride and maleic acid was changed. The weight average molecular weight was 24,000, and the polymerization rate was 100%.
- Synthesis Example of 10:5:5 ternary copolymer of diallyldimethylammonium chloride: 2-acrylamide-2-methylpropanesulfonic acid and sulfur dioxide
- In a 500 mL four-necked separable flask equipped with a stirrer, a cooling pipe and a thermometer, 248.7 g (1.0 mol) of 65 mass % DADMAC aqueous solution, 103.6 g (0.5 mol) of AMPS and 32.0 g (0.5 mol) of SO2 were dissolved in 242.3 g of water. Then, 67.1 g of 28.5 mass % ammonium persulfate aqueous solution was added, and polymerization was performed at 18 to 70° C. for 72 hours to produce the copolymer specified in the title and to be used in Comparative Example 3. The solution after the completion of the polymerization was measured by the GPC method to reveal that the weight-average molecular weight was 11,500 and the polymerization rate was 95.0%.
- Synthesis Example of 1:1 binary copolymer of diallylaminehydrochloric acid salt and sulfur dioxide
- In a 500 mL four-necked separable flask equipped with a stirrer, a cooling pipe and a thermometer, 202.5 g (1.0 mol) of 66 mass % DA.HC1 and 64.1 g (1.0 mol) of SO2 were dissolved in 206.7 g of water. Then, 13.7 g of 28.5 mass % ammonium persulfate aqueous solution was added, and polymerization was performed at 18 to 60° C. for 24 hours to produce the copolymer specified in the title and to be used in Comparative Example 4. The solution after the completion of the polymerization was measured by the GPC method to reveal that the weight average molecular weight was 5,000 and the polymerization rate was 96.0%.
- Synthesis Example of 1:1 binary copolymer of diallyldimethylammonium chloride and sulfur dioxide
- In a 500 mL four-necked separable flask equipped with a stirrer, a cooling pipe and a thermometer, 248.7 g (1.0 mol) of 65 mass % DADMAC and 64.1 g (1.0 mol) of SO2 were dissolved in 210.0 g of water. Then, 16.5 g of 28.5 mass % ammonium persulfate aqueous solution was added, and polymerization was performed at 18 to 60° C. for 72 hours to produce the copolymer specified in the title and to be used in Comparative Example 5. The solution after the completion of the polymerization was measured by the GPC method to reveal that the weight-average molecular weight was 4,200 and the polymerization rate was 95.0%.
- Measurement of solubility, amount of corrosion, corrosion suppression rate, and performance deterioration rate
- With respect to each of the copolymers obtained in Synthesis Examples and Comparative Synthesis Examples, above, a detergent solution composition was prepared by the following method and evaluated.
- To 500 mL of a detergent solution aqueous solution comprising a 3.5 mass % hydrochloric acid aqueous solution (hereinafter, referred to an “acid solution”), each of the copolymers produced in Synthesis Examples and Comparative Synthesis Examples (that constitutes the anti-corrosive agent according to the present invention) was added in an amount of 50 mg or1000 mg (in terms of the solid content) according to Table 1 to obtain a detergent solution composition.
- In the preparation of the detergent solution composition, above, the state of the solution when the anti-corrosive agent was added to the detergent solution aqueous solution was visually observed to evaluate the solubility. The state in which turbidity was recognized was classified as “turbid”, and the state of complete dissolution without turbidity was classified as “not turbid”.
- The detergent solution composition prepared by the method, above, was heated to 80° C. Then, a hot-rolled steel sheet (JIS3131) polished with a #180 waterproof polishing paper was immersed in the detergent solution composition for 10 minutes. From the surface area of the test piece and measurement results of the weight of the test piece before and after the immersion, the amount of corrosion was calculated according to the following expression (1).
-
amount of corrosion (mg/cm2)=[weight of test piece before immersion (mg)−weight of test piece after immersion (mg)]/surface area of test piece (cm2) (1) - From the result of the amount of corrosion calculated according to the expression (1), the corrosion suppression rate was calculated according to the following expression (2).
-
anti-corrosion rate (%)=[amount of corrosion in Comparative Example 6 (mg/cm2)−amount of corrosion in each Example or Comparative Example (mg/cm2)]×100/amount of corrosion in Comparative Example 6 (mg/cm2) (2) - From the corrosion suppression rate when the amount of the anti-corrosive agent added was 1000 mg and the corrosion suppression rate when the amount of the anti-corrosive agent added was 50 mg, the performance deterioration rate was calculated according to the following expression (3).
-
performance reducing rate (%)=100−A (3) -
(A=(corrosion suppression rate when the amount of the anti-corrosive agent added was 1000 mg (%)×100)/corrosion suppression rate when the amount of the anti-corrosive agent added was 50 mg (%)) - The results are shown in Table 1. The result of the test performed using only the acid solution with no anti-(acid) corrosive agent added is also shown in Table 1 as “Blank” (Comparative Example 6).
- With reference to Table 1, it turned out that the anti-corrosive agent for washing of a metal with an acid according to the present invention has high solubility in the acid solution. Additionally, it turned out that the anti-corrosive agent for washing of a metal with an acid according to the present invention has a high corrosion suppression rate both in the concentrations of the added amounts of 50 mg and 1000 mg and furthermore that the corrosion suppression rate changes little even when the concentration changes and that the performance deterioration rate is small.
-
TABLE 1 Results of test of anti-corrosion in acid washing Amount of corrosion Performance Name of sample Copolymerization Amount corrosion suppression deterioration (Synthesis Example) ratio added [mg] Solubility [mg/cm2] rate [%] rate [%] Example 1 P (DADMAC-MA-SO2) 10:5:5 50 Not turbid 0.114 91.5 2.52 (Synthesis Example 1) 1000 Not turbid 0.145 89.2 2 P (DADMAC-MA-SO2) 10:4:1 50 Not turbid 0.157 88.3 2.61 (Synthesis Example 2) 1000 Not turbid 0.188 86.0 3 P (DADMAC-MA-SO2) 10:3.5:1.5 50 Not turbid 0.176 86.9 2.65 (Synthesis Example 3) 1000 Not turbid 0.207 84.6 4 P (DADMAC-MA-SO2) 10:2:3 50 Not turbid 0.163 87.9 2.62 (Synthesis Example 4) 1000 Not turbid 0.194 85.6 Comparative 1 P (DADMAC-MA) 1:1 50 Not turbid 0.274 79.6 2.90 Example (Comparative Synthesis 1000 Not turbid 0.305 77.3 Example 1) 2 P (DADMAC-MA) 2:1 50 Not turbid 0.252 81.3 3.02 (Comparative Synthesis 1000 Not turbid 0.285 78.8 Example 2) 3 P (DADMAC-AMPS-SO2) 10:5:5 50 Not turbid 0.203 84.9 4.99 (Comparative Synthesis 1000 Not turbid 0.260 80.7 Example 3) 4 P (DA•HCl—SO2) 1:1 50 Not turbid 0.094 93.0 13.97 (Comparative Synthesis 1000 Turbid 0.269 80.0 Example 4) 5 P (DADMAC-SO2) 1:1 50 Not turbid 0.141 89.5 25.68 (Comparative Synthesis 1000 Not turbid 0.450 66.5 Example 5) 6 Blank — — — 1.345 — — In Table 1, the following abbreviations are used: P(DADMAC-MA-SO2): poly(diallyldimethylammonium chloride/maleic acid/SO2) P(DADMAC-MA): poly(diallyldimethylammonium chloride/maleic acid) P(DADMAC-AMPS-SO2): poly(diallyldimethylammonium chloride/2-acrylamide-2-methylpropanesulfonic acid/SO2) P(DA•HCl—SO2): poly(diallylamine hydrochloric acid salt/SO2) P(DADMAC-SO2): poly(diallyldimethylammonium chloride/SO2) - The anti-corrosive agent for washing of a metal with an acid according to the present invention and the detergent solution composition and washing method using the same demonstrate a high anti-corrosion effect in acid washing of various surfaces of metals and show little change in the anti-corrosion effect even when the concentration of the anti-corrosive agent changes. Accordingly, the present invention is highly valuable and has high applicability in a variety of industries such as the metal industries.
Claims (9)
1. An anti-corrosive agent for washing of a metal with an acid, comprising an amphoteric polymer compound (P) having: at least one cationic constituent unit (A) having a structure represented by the following structural formula (Ia) or (Ib), a structure corresponds to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (IIa) or formula (IIb):
wherein R1 in formulae (Ia) and (Ib), above, is hydrogen atom, methyl group, ethyl group, or benzyl group; R2 and R3 in formulae (IIa) and (IIb), above, each independently are hydrogen atom, methyl group, ethyl group, or benzyl group; and X− in formulae (IIa) and (IIb), above, is a counter ion;
at least one anionic constituent unit (B) represented by the following structural formula (III), (IV) or (V):
wherein R4 in formula (III), above, is hydrogen or methyl group; and Y in formulae (III), (IV) and (V) each independently are hydrogen, Na, K, NH4, ½Ca, ½Mg, ½Fe, ⅓Al, or ⅓Fe for each carboxy group to which they are bonded); and
a constituent unit (C) represented by the following structural formula (VI):
2. The anti-corrosive agent according to claim 1 , wherein the counter ion X− is an anion derived from an organic acid or an inorganic acid.
3. The anti-corrosive agent according to claim 1 , wherein at least a part of the cationic constituent unit (A) is derived from a cationic monomer selected from the group consisting of diallylamines and inorganic acid salts and organic acid salts thereof.
4. The anti-corrosive agent according to claim 1 , wherein at least a part of the cationic constituent unit (A) is derived from diallyldimethylammonium chloride and at least a part of the anionic constituent unit (B) is derived from maleic acid.
5. An anti-corrosive agent for washing of a metal with an acid, comprising an amphoteric polymer compound (F) obtainable by copolymerizing:
at least one monomer (a) having a structure represented by the following structural formula (VII), a corresponds to an inorganic acid salt or an organic acid salt thereof or a structure represented by the following structural formula (VIII):
wherein R5 in formula (VII), above, is hydrogen atom, methyl group, ethyl group, or benzyl group; R6 and R7 in formula (VIII), above, each independently are hydrogen atom, methyl group, ethyl group, or benzyl group; and Z− in formula (VIII), above, is a counter ion);
at least one monomer (β) selected from the group consisting itaconic acid, citraconic acid, mesaconic acid, maleic acid, fumaric acid, methylenemalonic acid, and compounds in which the hydrogens in the carboxyl groups in these acids are entirely or partially substituted with at least one species selected from the group consisting of Na, K, NH4, ½Ca, ½Mg, ½Fe, ⅓Al, and ⅓Fe; and
sulfur dioxide.
6. A detergent solution composition comprising an acid solution and an anti-corrosive agent according to claim 1 , wherein the content of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′) is 0.1 to 50000 mg based on 1 L of the acid solution.
7. A method for washing a metal, characterized in that the detergent solution composition according to claim 6 is sprayed to the surface of the metal or the surface of the metal is immersed in the detergent solution composition to carryout the washing.
8. A detergent solution composition comprising an acid solution and an anti-corrosive agent according to claim 5 , wherein the content of the amphoteric polymer compound (P) or the amphoteric polymer compound (P′) is 0.1 to 50000 mg based on 1 L of the acid solution.
9. A method for washing a metal, characterized in that the detergent solution composition according to claim 8 is sprayed to the surface of the metal or the surface of the metal is immersed in the detergent solution composition to carryout the washing.
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WO2019133821A1 (en) * | 2017-12-28 | 2019-07-04 | Guardian Glass, LLC | Anti-corrosion coating for a glass substrate |
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JP2019048284A (en) * | 2017-09-12 | 2019-03-28 | オルガノ株式会社 | Silica-based scale inhibitor and method of inhibiting silica-based scale |
JP7236635B2 (en) * | 2019-02-28 | 2023-03-10 | 藤倉コンポジット株式会社 | SURFACE TREATMENT AGENT AND MANUFACTURING METHOD THEREOF, SURFACE TREATMENT SUBSTRATE AND SURFACE TREATMENT METHOD |
JP7530847B2 (en) | 2021-02-25 | 2024-08-08 | 日本ペイント・オートモーティブコーティングス株式会社 | Cationic electrodeposition coating composition |
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