JP6525216B2 - Undercoating material for steel corrosion protection - Google Patents
Undercoating material for steel corrosion protection Download PDFInfo
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- JP6525216B2 JP6525216B2 JP2017202072A JP2017202072A JP6525216B2 JP 6525216 B2 JP6525216 B2 JP 6525216B2 JP 2017202072 A JP2017202072 A JP 2017202072A JP 2017202072 A JP2017202072 A JP 2017202072A JP 6525216 B2 JP6525216 B2 JP 6525216B2
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- 239000000463 material Substances 0.000 title claims description 147
- 229910000831 Steel Inorganic materials 0.000 title claims description 68
- 239000010959 steel Substances 0.000 title claims description 68
- 238000005260 corrosion Methods 0.000 title claims description 36
- 230000007797 corrosion Effects 0.000 title claims description 34
- 239000004568 cement Substances 0.000 claims description 56
- 239000000843 powder Substances 0.000 claims description 51
- 229920005989 resin Polymers 0.000 claims description 35
- 239000011347 resin Substances 0.000 claims description 35
- 239000002562 thickening agent Substances 0.000 claims description 30
- 239000004499 emulsifiable powder Substances 0.000 claims description 24
- 239000011398 Portland cement Substances 0.000 claims description 15
- 239000011149 active material Substances 0.000 claims description 12
- -1 acrylate ester Chemical class 0.000 claims description 9
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 6
- 229910021487 silica fume Inorganic materials 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 42
- 238000012360 testing method Methods 0.000 description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 36
- 238000000576 coating method Methods 0.000 description 35
- 239000011248 coating agent Substances 0.000 description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- 235000002639 sodium chloride Nutrition 0.000 description 20
- 230000000694 effects Effects 0.000 description 18
- 150000003839 salts Chemical class 0.000 description 18
- 239000002518 antifoaming agent Substances 0.000 description 16
- 239000000203 mixture Substances 0.000 description 16
- 239000003973 paint Substances 0.000 description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 12
- 239000002585 base Substances 0.000 description 12
- 239000007921 spray Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 9
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 7
- 238000005536 corrosion prevention Methods 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 235000011116 calcium hydroxide Nutrition 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
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- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 125000005396 acrylic acid ester group Chemical group 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
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- 239000004482 other powder Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 239000008199 coating composition Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000011414 polymer cement Substances 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007761 roller coating Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
- 229920003067 (meth)acrylic acid ester copolymer Polymers 0.000 description 1
- DTCCVIYSGXONHU-CJHDCQNGSA-N (z)-2-(2-phenylethenyl)but-2-enedioic acid Chemical compound OC(=O)\C=C(C(O)=O)\C=CC1=CC=CC=C1 DTCCVIYSGXONHU-CJHDCQNGSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- RVGRUAULSDPKGF-UHFFFAOYSA-N Poloxamer Chemical compound C1CO1.CC1CO1 RVGRUAULSDPKGF-UHFFFAOYSA-N 0.000 description 1
- 108010009736 Protein Hydrolysates Proteins 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 229920002310 Welan gum Polymers 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical compound [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229920003087 methylethyl cellulose Polymers 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- 229940005654 nitrite ion Drugs 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical class NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Paints Or Removers (AREA)
Description
本発明は鋼材防食用下塗り材に関する。 The present invention relates to a primer for corrosion protection of steel.
今日多くの鋼材が、橋梁・道路フェンス・歩道橋等の公共設備、手摺り・バルコニー・フェンス・門扉などの住宅建築資材、タンク等などの工業設備、その他多くの分野で使用されている。しかし、鋼材は本質的に錆びるという性質を有する。
鋼材の錆びは、水分と空気中の酸素により引き起こされるが、工場排気ガスに由来する硫酸イオン、海塩粒子に由来する塩化物イオンにより促進される。また寒冷地の道路設備においては、冬季に散布される解氷剤(塩化カルシウム)によっても促進される。
このため、鋼材表面には通常防食塗装が施される。防食効果を高めるため多くの場合、下塗り塗装後、中塗り、上塗り等の多層塗工が施される。
Today, many steel products are used in public facilities such as bridges, road fences and footbridges, housing construction materials such as handrails, balconies, fences and gates, industrial facilities such as tanks, and many other fields. However, steel materials inherently have the property of rusting.
The rusting of steel materials is caused by moisture and oxygen in air, but is promoted by sulfate ions derived from plant exhaust gas and chloride ions derived from sea salt particles. In addition, in cold district road facilities, it is also promoted by the deicing agent (calcium chloride) sprayed in winter.
Therefore, anticorrosion coating is usually applied to the steel surface. In order to enhance the anticorrosion effect, in many cases, after the undercoating, a multilayer coating such as an intermediate coating and an overcoating is applied.
防食塗材の一つとして、ポリマーセメント系塗料が知られている(例えば、特開昭60−243169号公報(以後、特許文献1))。ポリマーセメント系塗料は、水硬化性であり、かつ、ポリマーの選択によっては可撓性を持たせることが出来るため、鋼材の膨張、収縮に十分追従でき、そのためクラック等が発生しにくく、長期防食性に優れるとされるが、塗膜自体には塩化物イオンの捕捉機能が無いため、防食性能が十分でなかった。 A polymer cement-based paint is known as one of the anticorrosion paint (for example, Japanese Patent Application Laid-Open No. 60-243169 (hereinafter referred to as Patent Document 1)). Polymer cement paint is water-curable and can be flexible depending on the choice of polymer, so it can sufficiently follow the expansion and contraction of steel materials, so it is difficult to generate cracks etc., and long-term corrosion protection Although it is considered to be excellent, the coating film itself does not have a chloride ion capturing function, so the anticorrosion performance was not sufficient.
一方、特開平05−043282号公報(以後、特許文献2)には、塩化物イオンの捕捉機能を有する化合物として、ハイドロカルマイト(とりわけ亜硝酸型ハイドロカルマイト)が記載されている。また、特開平11−92692号公報(以後、特許文献3)、特開2007−191385号公報(以後、特許文献4)、特許第3859731号公報(以後、特許文献5)には、塗料ビヒクルに上記ハイドロカルマイトを配合した防錆塗料組成物が開示されている。 On the other hand, Japanese Patent Application Laid-Open No. 05-043282 (hereinafter referred to as Patent Document 2) describes hydrocalumite (in particular, a nitrite-type hydrocalumite) as a compound having a function of capturing chloride ions. Further, JP-A-11-92692 (hereinafter referred to as Patent Document 3), JP-A-2007-191385 (hereinafter referred to as Patent Document 4), and Japanese Patent No. 3859 731 (hereinafter referred to as Patent Document 5) An anticorrosion paint composition incorporating the above hydrocalumite is disclosed.
特開2004−299979号公報(以後、特許文献6)には、セメント系下地調整材にハイドロカルマイトを含有させた鋼材用下地調整材が開示されている。より具体的にはセメントを含む水硬化性成分に、陰イオン吸着剤としてのハイドロカルマイト、およびポリマー混和剤として水性エポキシ樹脂等を配合した鋼材用の下地調整材が開示されている。 Japanese Patent Application Laid-Open No. 2004-299979 (hereinafter referred to as Patent Document 6) discloses a substrate adjusting material for steel material in which hydrocalumite is contained in a cement-based substrate adjusting material. More specifically, there is disclosed a base adjusting material for steel materials in which hydrocalumite as an anion adsorbent and a water-based epoxy resin as a polymer admixture are mixed with a water-curable component containing cement.
特許文献3〜5の防錆塗料組成物や、特許文献6の下地調整材は、その成分として、塩化物イオン捕捉機能を有するハイドロカルマイトを含んでいるため、従来の防食塗材よりも防食機能が高いものと期待された。 The anticorrosion paint compositions of Patent Documents 3 to 5 and the base conditioning material of Patent Document 6 contain hydrocalumite having a chloride ion capturing function as a component thereof, and therefore, the corrosion protection is better than that of the conventional anticorrosion coating material The function was expected to be high.
そこで、特許文献3〜5に記載の防錆塗料組成物につき、本発明者らがその性能を評価したところ、その防錆効果は未だ十分ではないことが判明した。この理由は定かではないが、特許文献3〜5に記載の防錆塗料組成物は、ハイドロカルマイトを有機系のポリマーを基体成分とする塗料ビヒクルに添加したものであるため、亜硝酸イオン/塩化物イオン/水酸化物イオンなどのイオンが移動しにくくなり、ハイドロカルマイトの機能が十分に発揮されないものと本発明者らは推定している。 Then, when the present inventors evaluated the performance about the antirust coating composition of patent documents 3-5, it turned out that the antirust effect is not enough yet. Although the reason for this is not clear, the rustproof coating composition described in Patent Documents 3 to 5 is one in which hydrocalumite is added to a paint vehicle containing an organic polymer as a base component, and therefore nitrite / The present inventors estimate that ions such as chloride ion / hydroxide ion are difficult to move and the function of hydrocalumite is not sufficiently exhibited.
また、特許文献6に記載の下地調整材につき、本発明者らがその後さらに詳細に評価検討した結果、鋼材の防食効果が未だ十分でないことが判明した。また当該下地調整材は粘度が高いため、塗装ムラが生じやすく、そのため防食効果を十分に確保するためには、過度の重ね塗りを要するという問題があることも判明した。 Moreover, as a result of the present inventors after carrying out evaluation examination in more detail about the base adjustment material of patent document 6, it turned out that the anti-corrosion effect of steel materials is not yet enough. Moreover, since the said base | substrate adjusting material is high in viscosity, it is easy to produce coating nonuniformity, Therefore, in order to fully ensure an anti-corrosion effect, it also became clear that there existed a problem of requiring excessive recoating.
そこで本発明者らは、ハイドロカルマイトの塩化物イオン捕捉機能を最大限に活かした、防食性・塗装性に優れる鋼材防食用下塗り材を完成することを課題として検討を進めた。 Therefore, the inventors of the present invention have made investigations on the problem of completing an undercoat material for corrosion protection of a steel material excellent in corrosion resistance and paintability, making the most of the chloride ion capturing function of hydrocalumite.
鋭意検討の結果、本発明者らは、
1.セメント系水硬化材(A)、細骨材(B)、亜硝酸型ハイドロカルマイト(C)、再乳化形粉末樹脂(D)及び増粘剤(E)を含む組成物が鋼材の防食効果に優れ、かつ、塗装性の良好な水硬化性下塗り材となること、上記水硬化性下塗り材がさらに消泡剤(F)及び流動性改良剤(G)を含む場合には防食効果及び塗装性の一層優れた下塗り材となること、また上記増粘剤(E)を粉末系増粘剤(E1)とし、上記消泡剤(F)を粉末系消泡剤(F1)とし、上記流動性改良剤(G)を粉末系流動性改良剤(G1)とすることで、防食性能がさらに高まり、その上水を加えるだけ塗装ができる粉末系の水硬化性下塗り材となること、
2.鋼材に防食塗装を施すに際して、上記の下塗り材の水硬化物にて下塗り層を形成させ、次いで弱溶剤エポキシ塗料を塗装して中塗り層を形成させる方法が鋼材に卓越した防食性能を付与できること、
3.鋼材表面に、上記の下塗り材の水硬化物よりなる下塗り層を形成させ、ついでその下塗り層に重ねて弱溶剤エポキシ樹脂塗料よりなる中塗り層を形成させ、さらにその中塗り層に重ねて、上塗り層を形成させてなる鋼材が卓越した防食鋼材となること、
を見出し、本発明を完成するに至った。
As a result of intensive studies, the present inventors
1. Composition containing cement-based water-hardening material (A), fine aggregate (B), nitrous acid type hydrocalumite (C), re-emulsifiable powder resin (D) and thickener (E) is the anticorrosive effect of steel materials Become a water-curable primer having excellent paintability and good paintability, and when the water-curable primer further contains an antifoam (F) and a fluidity improver (G), the anticorrosion effect and the paint Become a more superior undercoating material, and the thickener (E) is a powder thickener (E1) and the antifoam (F) is a powder antifoam (F1); By using the powder type flowability improver (G1) as the property improver (G), the anticorrosion performance is further enhanced, and it becomes a powder type water curable primer which can be coated only by adding water thereon.
2. When applying anticorrosion coating to steel materials, the method of forming an undercoat layer with a water-cured product of the above-mentioned undercoat material and then applying a weak solvent epoxy paint to form an intermediate coating layer can impart excellent corrosion resistance performance to steel materials. ,
3. A subbing layer consisting of a water-cured product of the above subbing material is formed on the surface of the steel material, then the subbing layer is overlaid to form an intermediate coating layer made of a weak solvent epoxy resin coating, and further overlaid on the intermediate coating layer The steel material that forms the top coat layer becomes an excellent corrosion resistant steel material,
The present invention has been completed.
すなわち、本発明は下記(1)から(5)の態様に示す鋼材防食用下塗り材を提供するものである;
(1)セメント系水硬化材(A) 、細骨材(B)、亜硝酸型ハイドロカルマイト(C)、再乳化形粉末樹脂(D)及び増粘剤(E)を含む鋼材防食用下塗り材。
(2)再乳化形粉末樹脂(D)がアクリル酸エステル系再乳化形樹脂である上記(1)の鋼材防食用下塗り材。
(3)さらに、消泡剤(F)及び流動性改良剤(G)を含む上記(1)の鋼材防食用下塗り材。
(4)さらに、消泡剤(F)及び流動性改良剤(G)を含む上記(2)の鋼材防食用下塗り材。
(5)セメント系水硬化材(A)100質量部 、細骨材(B)50〜150質量部、亜硝酸型ハイドロカルマイト(C)10〜100質量部、再乳化形粉末樹脂(D)5〜30質量部、増粘剤(E)0.05質量部〜1質量部、消泡剤(F)0.05〜0.5質量部及び流動性改良剤(G)0.05〜0.7質量部からなる上記(3)又は(4)の鋼材防食用下塗り材。
That is, the present invention provides a primer for corrosion protection of steel according to the following aspects (1) to (5);
(1) Cement-based water-hardening material (A), fine aggregate (B), nitrous acid hydrocalumite (C), re-emulsifiable powder resin (D) and thickener (E) for corrosion protection of steel materials Material.
(2) The undercoat material for steel corrosion prevention according to the above (1), wherein the re-emulsifiable powder resin (D) is an acrylic acid ester re-emulsifiable resin.
(3) The primer for corrosion protection of steel according to the above (1), which further comprises an antifoaming agent (F) and a fluidity improver (G).
(4) The primer for corrosion protection of steel according to the above (2), which further comprises an antifoaming agent (F) and a flowability improving agent (G).
(5) Cement based water curing material (A) 100 parts by mass, fine aggregate (B) 50 to 150 parts by mass, nitrous acid type hydrocalumite (C) 10 to 100 parts by mass, re-emulsifiable powder resin (D) 5-30 parts by mass, thickener (E) 0.05 parts by mass to 1 part by mass, antifoaming agent (F) 0.05-0.5 parts by mass and fluidity improver (G) 0.05-0 (7) The primer for corrosion protection of steel according to the above (3) or (4), which comprises 7 parts by mass.
また本発明は、上記(1)から(5)の鋼材防食用下塗り材のより好ましい態様として、その構成成分がすべて粉末であって、当該構成成分をあらかじめプレミックスして生成される下記(6)、(7)の鋼材防食用粉末系下塗り材を提供するものである。これらの鋼材防食用粉末系下塗り材は、単に水を加えるのみで水硬化するため、ハンドリング性、現場作業性に優れる下塗り材となる;
(6)上記(1)から(5)の態様において、増粘剤(E)として粉末系増粘剤(E1)、消泡剤(F)として粉末系消泡剤(F1)、流動性改良剤(G)として粉末系流動性改良剤(G1)を含む鋼材防食用粉末系下塗り材。
(7)上記粉末系増粘剤(E1)は、セルロース系増粘剤又はポリサッカライド系増粘剤である、上記(6)の鋼材防食用粉末系下塗り材。
(以下、上記(1)〜(7)の態様の鋼材防食用下塗り材を「本発明下塗り材」と称し、上記(6)、(7)の態様の鋼材防食用粉末系下塗り材を「本発明粉末系下塗り材」と称し、本発明下塗り材の水硬化物により形成される下塗り層を「本発明下塗り層」と称することがある。)
Further, according to the present invention, as a preferred embodiment of the undercoat material for steel corrosion prevention according to the above (1) to (5), all of the constituent components are powder, and the following constituent (6) And 7) provide a powder base primer for corrosion protection of steel materials. Since these steel powder base coats for corrosion protection are water hardened only by adding water, they become coat coats excellent in handling property and on-site workability;
(6) In the above embodiments (1) to (5), powder thickener (E1) as thickener (E), powder antifoam (F1) as antifoam (F), flowability improvement Powder based primer for corrosion protection of steel material, which comprises powder based fluidity improver (G1) as agent (G).
(7) The powder based undercoating material as set forth in (6), wherein the powder-based thickener (E1) is a cellulose-based thickener or a polysaccharide-based thickener.
(Hereinafter, the undercoat material for steel corrosion prevention according to the embodiments of the above (1) to (7) is referred to as "the present invention undercoat material", and the powder based undercoat material for corrosion protection of steel according to the embodiments of (6) and (7) The undercoat layer formed by the water-cured product of the undercoating material of the present invention may be referred to as the "inventive powder-based undercoating material", and may be referred to as the "substituent layer of the present invention".
以下、本発明について詳しく説明する。
<鋼材防食用下塗り材>
上記(1)〜(7)に示した本発明下塗り材は、セメント系水硬化材(A)、細骨材(B)、再乳化形粉末樹脂(C)、亜硝酸型ハイドロカルマイト(D)及び増粘剤(E)を必須成分として含む。本発明下塗り材は水と混和することにより、塗装性が良好で、鋼材との密着性に優れ、かつ防食性能の卓越した鋼材防食用水硬化性下塗り材となる。
Hereinafter, the present invention will be described in detail.
<Steel coating for corrosion protection>
The undercoating material of the present invention described in the above (1) to (7) is a cement-based water-hardening material (A), fine aggregate (B), re-emulsifiable powder resin (C), nitrous acid type hydrocalumite (D And thickener (E) as essential components. The undercoating material of the present invention, when mixed with water, becomes a water-curable undercoating material for steel corrosion protection, which has good paintability, excellent adhesion to steel materials, and excellent corrosion resistance performance.
本発明下塗り材は、上記(A)から(E)の成分のいずれを欠いてもその目的を達成することが出来ない。
以下、本発明下塗り材について、その構成成分毎に説明する。
(A)セメント系水硬化材
本発明下塗り材はセメント系水硬化材を必須成分として含む。
本発明にいうセメント系水硬化材とは、セメントを主成分とする水硬化性組成物をいい、本発明下塗り材に水硬化性を付与する。これにより、本発明下塗り材と水との混和物を鋼材に塗布することにより、その表面に強固な水硬化性塗膜を形成することができる。また、セメント系水硬化材は水和反応により水酸化カルシウムを生成し、結果アルカリ性を呈するため、鋼材の錆発生を抑制する。
The primer of the present invention can not achieve its purpose even if it lacks any of the components (A) to (E).
Hereinafter, the undercoating material of the present invention will be described for each component thereof.
(A) Cement-Based Water-Hardening Material The primer of the present invention comprises a cement-based water-hardening material as an essential component.
The cement-based water-hardening material referred to in the present invention means a water-curable composition containing cement as a main component, and imparts water-hardening properties to the primer of the present invention. Thus, by applying a mixture of the primer of the present invention and water to a steel material, a strong water-curable coating can be formed on the surface thereof. In addition, the cement-based water-hardening material generates calcium hydroxide by hydration reaction, and as a result, exhibits alkalinity, thereby suppressing rusting of the steel material.
本発明において、セメント系水硬化材は、コンクリート構造物におけるセメント成分とは異なり、単に水硬化するのみならず、下塗り材として、鋼板表面に高強度かつ均一の塗膜を形成するものがより好ましい。
したがって、本発明にいうセメント系水硬化材としては、
(A1)セメント単独のほか、
(A2)セメント及びポゾラン活性材、
(A3)セメント及び潜在水硬材、又は
(A4)セメント、ポゾラン活性材及び潜在水硬材
よりなるものを挙げることができる。
上記(A1)〜(A4)のセメント系水硬化材はいずれも鋼材表面に強固な水硬化性塗膜を形成し得るが、セメントの一部をポゾラン活性材で置換したもの(A2)、セメントの一部を潜在水硬材で置換したもの(A3)、セメントの一部をポゾラン活性材及び潜在水硬材で置換したもの(A4)は、セメント単独の場合よりも緻密な塗膜が形成されるため、防錆効果が更に高まり好ましい。
In the present invention, unlike the cement component in a concrete structure, the cement-based water-hardening material is not only simply water-hardened, but as the undercoating material, it is more preferable to form a coating film of high strength and uniform on the steel sheet surface. .
Therefore, as the cement-based water hardener in the present invention,
(A1) Besides cement alone,
(A2) cement and pozzolanic active material,
(A3) cement and latent hydraulic material, or (A4) cement, pozzolanic active material and latent hydraulic material can be mentioned.
The cement-based water-curable materials of (A1) to (A4) can all form a strong water-curable coating on the surface of the steel material, but some of the cement is substituted with a pozzolanic active material (A2), cement In the case where part of the cement is replaced with latent hydraulic material (A3), and the part of cement is replaced with pozzolanic active material and latent hydraulic material (A4), a denser film is formed than in the case of cement alone As a result, the antirust effect is further enhanced, which is preferable.
(A1)〜(A4)におけるセメントは、典型的にはポルトランドセメントであるがこれに制約されない。またポルトランドセメントの種類としては、普通ポルトランドセメントのほか、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメント、耐硫酸塩ポルトランドセメントがあるが、本発明においてはこれらのいずれも使用することができる。以上のうち、早強ポルトランドセメント、超早強ポルトランドセメントを好適に使用することが出来る。 The cement in (A1) to (A4) is typically, but not limited to, Portland cement. Further, as types of Portland cement, in addition to ordinary Portland cement, there are early-strength Portland cement, ultra-early-strength Portland cement, moderate heat Portland cement, low-heat Portland cement, sulfate resistant Portland cement, and any of these in the present invention. Can also be used. Among the above, early-strength Portland cement and ultra-early-strength Portland cement can be suitably used.
上記(A2)、(A4)にいうポゾラン活性材とは、二酸化ケイ素を主成分として含有する微粉状物質で、それ自身は水硬化しないものの、セメントの水和の際に生成される水酸化カルシウムと、上記シリカ質とが反応して(ポゾラン反応と称せられる)、緻密構造の珪酸カルシウム水和物を生成するものをいう。セメント系水硬化材がポゾラン活性材を含むと、本発明下塗り層は、セメント単独の場合よりも、塗膜強度、鋼板密着強度、塩化物イオン遮蔽性が向上し、結果その防錆効果が一層高まる。
ポゾラン活性材としては、シリカヒューム、フライアッシュ、火山灰、珪酸白土などを挙げることができる。これらのうち、シリカヒューム、フライアッシュは、ともに二酸化ケイ素含有量が高く、かつ、粒度が細かいので特に好ましい。
加えてシリカヒュームとフライアッシュはともに粒子形状が球状であるため、ベアリング効果により、下塗り材の流動性を高め、本発明下塗り材の塗装性も向上させる。すなわち、ローラーや刷毛へののりが良好で、ローラー塗装後の塗装ムラがなくなる。
上記シリカヒューム又はフライアッシュに代表されるポゾラン活性材がセメント系水硬化材に占める割合は、5〜20質量%の範囲が好ましい。
The pozzolanic active material referred to in the above (A2) and (A4) is a fine powdery substance containing silicon dioxide as a main component, and although it itself does not harden by water, calcium hydroxide formed upon hydration of cement And the above-mentioned siliceous substance (referred to as pozzolanic reaction) to form calcium silicate hydrate of a compact structure. When the cement-based water-hardening material contains a pozzolanic active material, the subbing layer of the present invention improves coating film strength, steel sheet adhesion strength, chloride ion shielding properties more than cement alone, and as a result, its antirust effect is further enhanced. Increase.
Examples of pozzolanic active materials include silica fume, fly ash, volcanic ash, siliceous clay and the like. Among these, silica fume and fly ash are particularly preferable because they have high silicon dioxide content and fine particle size.
In addition, since both the silica fume and fly ash have spherical particle shapes, the bearing effect enhances the fluidity of the primer and also improves the paintability of the primer of the present invention. That is, the adhesion to the roller and the brush is good, and the coating unevenness after the roller coating is eliminated.
The proportion of the pozzolanic active material represented by the above-mentioned silica fume or fly ash in the cement-based water-hardening material is preferably in the range of 5 to 20% by mass.
上記(A3)、(A4)にいう潜在水硬材とは、主成分として酸化カルシウムと二酸化ケイ素を含有し、アルカリ条件下で、水硬性を発現するものをいい、代表例として高炉スラグ微粉末を挙げることが出来る。セメントの水和反応で生じた水酸化カルシウムによりアルカリ雰囲気になると、潜在水硬材中の酸化カルシウムと二酸化ケイ素は徐々に溶出し二酸化ケイ素の緻密な水和物を形成する。上記反応は長期にわたり継続される。
したがって、セメント系水硬化材が成分として潜在水硬材を含む場合には、本発明下塗り材は、高強度かつ緻密な硬化膜の層を長期にわたり形成するので、その塩化物イオンの遮蔽効果が長年月の間保持される。
上記高炉スラグ微粉末に代表される潜在水硬材がセメント系水硬化材に占める割合は、10〜40質量%の範囲が好ましい。
高炉スラグ微粉末は、その粒度の指標としてブレーン比表面積が4000(g/cm2)以上のものが好ましく、6000(g/cm2)以上のものがより好ましい。ここでブレーン比表面積とは、JISR5201(セメントの物理試験方法)に規定する、ブレーン空気透過装置を用いて測定される比表面積をいう(以下同じ)。
The latent hydraulic material referred to in the above (A3) and (A4) is one containing calcium oxide and silicon dioxide as main components, and exhibiting hydraulicity under alkaline conditions, and as a representative example, ground granulated blast furnace slag Can be mentioned. When an alkaline atmosphere is generated by calcium hydroxide generated by hydration of cement, calcium oxide and silicon dioxide in the latent hydraulic material gradually elute to form a compact hydrate of silicon dioxide. The above reaction is continued for a long time.
Therefore, when the cement-based water-hardening material contains a latent hydraulic material as a component, the primer of the present invention forms a layer of a high-strength and dense hardened film over a long period of time, so the chloride ion shielding effect Retained for many years months.
As for the ratio for which the potential hydraulic material represented by the said blast-furnace slag fine powder accounts for a cement-type water-hardening material, the range of 10-40 mass% is preferable.
The fine blast furnace slag fine powder preferably has a brane specific surface area of 4000 (g / cm 2 ) or more, more preferably 6000 (g / cm 2 ) or more, as an index of its particle size. Here, the Blaine specific surface area refers to the specific surface area measured using a Blaine air permeation device defined in JIS R 5201 (Physical test method for cement) (the same applies hereinafter).
(B)細骨材
本発明下塗り材は細骨材を必須成分として含む。
下塗り材が細骨材を欠くと、下塗り層の塗膜強度が低くなり、鋼材に振動や衝撃が加わるとクラックが発生しやすくなり、結果鋼材の防食性が乏しいものとなってしまう。
(B) Fine Aggregate The primer of the present invention contains fine aggregate as an essential component.
If the primer material lacks fine aggregate, the coating film strength of the primer layer will be low, and if the steel material is subjected to vibration or impact, cracks will easily occur, resulting in poor corrosion resistance of the steel material.
細骨材としては、天然細骨材、人工細骨材ともに好適に用いることができる。天然細骨材としては、川砂、陸砂、海砂、天然珪砂などを挙げることが出来る。但し、海砂を用いる場合には、塩分を十分に除去したものであることが肝要である。人工細骨材としては、高炉スラグ細骨材、フェロニッケルスラグ細骨材、銅スラグ細骨材、電気炉酸化スラグ細骨材等を使用することができる。 As fine aggregate, both natural fine aggregate and artificial fine aggregate can be used suitably. Natural fine aggregate includes river sand, land sand, sea sand, natural silica sand and the like. However, when using sea sand, it is important that the salt be sufficiently removed. As an artificial fine aggregate, a blast furnace slag fine aggregate, a ferro nickel slag fine aggregate, a copper slag fine aggregate, an electric furnace oxidation slag fine aggregate etc. can be used.
本発明下塗り材に含まれる細骨材の量は、セメント系水硬化材100質量部に対し50〜150質量部が好ましい。
細骨材が、セメント系水硬化材100質量部に対し50質量部以上含まれることにより、本発明下塗り層に一層高い強度が付与される。細骨材量は、セメント系水硬化材100質量部に対し、60質量部以上がより好ましく、80質量部以上が更に好ましい。
As for the quantity of the fine aggregate contained in this invention undercoat, 50-150 mass parts is preferable with respect to 100 mass parts of cement-type water-hardening materials.
When the fine aggregate is contained in an amount of 50 parts by mass or more based on 100 parts by mass of the cement-based water-hardening material, higher strength is imparted to the undercoat layer of the present invention. The amount of fine aggregate is preferably 60 parts by mass or more, and more preferably 80 parts by mass or more, with respect to 100 parts by mass of the cement-based water-hardening material.
他方、細骨材がセメント系水硬化材100質量部に対し150質量部以下含まれることにより、本発明下塗り材と水との混和物は、優れた塗装性(ワーカビリティ)を有することとなる。細骨材量は、上記セメント系水硬化材100質量部に対し、120質量部以下がより好ましく、100質量部以下が更に好ましい。 On the other hand, when the fine aggregate is contained in an amount of 150 parts by mass or less based on 100 parts by mass of the cement-based water-hardening material, the mixture of the primer of the present invention and water has excellent paintability (workability). . 120 mass parts or less are more preferable with respect to 100 mass parts of said cement type water-hardening materials, and, as for a fine aggregate amount, 100 mass parts or less are still more preferable.
細骨材は、細骨材成分の総質量中に占める粒子径500μm以上の成分の割合が30質量%以下であることが好ましい。粒子径500μm以上の成分が30質量%以下である場合には、最終的に得られる下塗り層塗膜の表面が平滑となり好ましい。粒子径500μm以上の成分の割合は、10質量%以下であることがより好ましく、5質量%以下であることが更に好ましい。なお粒子径分布の測定は、JIS Z 8011に定める篩法に従って求められる。 In the fine aggregate, the proportion of components having a particle diameter of 500 μm or more in the total mass of the fine aggregate component is preferably 30% by mass or less. When the component having a particle diameter of 500 μm or more is 30% by mass or less, the surface of the finally obtained undercoat layer is smoothed, which is preferable. The proportion of the component having a particle diameter of 500 μm or more is more preferably 10% by mass or less, and still more preferably 5% by mass or less. In addition, the measurement of particle size distribution is calculated | required according to the sieve method defined in JISZ8011.
(C)亜硝酸型ハイドロカルマイト
本発明下塗り材は亜硝酸型ハイドロカルマイトを必須成分として含む。
亜硝酸型ハイドロカルマイトは、鋼材の腐食要因である塩化物イオンを吸着するのみならず、鋼材の腐食抑制効果のある亜硝酸イオンを放出する作用を有する。下塗り材が亜硝酸型ハイドロカルマイトを欠く場合、下塗り層の鋼材防食性能は著しく劣ったものとなってしまい、本発明の目的を達することができない。
(C) Nitrite-Type Hydrocalumite The primer of the present invention contains nitrite-type hydrocalumite as an essential component.
The nitrite-type hydrocalumite not only adsorbs chloride ions, which are the cause of corrosion of steel materials, but also has the function of releasing nitrite ions that have a corrosion inhibiting effect on steel materials. In the case where the primer material lacks the nitrite type hydrocalumite, the steel corrosion resistance of the primer layer becomes extremely inferior, and the object of the present invention can not be achieved.
本発明に言う亜硝酸型ハイドロカルマイトとは、一般式:3CaO・Al2O3・Ca(NO2)2・nH2O(nは20以下の自然数を表す。)の化学式で示されるCa−Al系複合水酸化物であり、板状結晶構造を有している。 The nitrite-type hydrocalumite referred to in the present invention is Ca represented by a chemical formula of the general formula: 3CaO.Al 2 O 3 .Ca (NO 2 ) 2 .nH 2 O (n represents a natural number of 20 or less). -Al-based composite hydroxide, having a plate-like crystal structure.
亜硝酸型ハイドロカルマイトは、例えばアルミン酸ソーダと可溶性カルシウム塩及び/又はアルカリ金属塩と消石灰とからなる原料系を反応・結晶化させる方法(特開平07−033340号公報)、CaO・Al2O3系化合物と可溶性カルシウム塩及び/又は消石灰とを液中で反応・結晶化させる方法(特開平07−033341号公報)により、粉末形態にて得ることが出来る。 The nitrite type hydrocalumite is produced, for example, by a method of reacting and crystallizing a raw material system comprising sodium aluminate and a soluble calcium salt and / or an alkali metal salt and slaked lime (Japanese Patent Application Laid-Open No. 07-033340), CaO · Al 2 It can be obtained in a powder form by a method of reacting / crystallizing an O 3 -based compound and a soluble calcium salt and / or slaked lime in a liquid (JP-A-07-033341).
本発明下塗り材に含まれる亜硝酸型ハイドロカルマイトの量は、上記セメント系水硬化材100質量部に対し10〜100質量部であることが好ましい。 The amount of the nitrite-type hydrocalumite contained in the undercoating material of the present invention is preferably 10 to 100 parts by mass with respect to 100 parts by mass of the cement-based water-curable material.
亜硝酸型ハイドロカルマイトが上記セメント系水硬化材100質量部に対し10質量部以上含まれることにより、本発明下塗り材の水硬化物は、塩化物イオンの吸着能と亜硝酸イオン放出能に優れるものとなる。結果当該水硬化物により形成される下塗り層は卓越した防食性能を発揮する。 By containing 10 parts by mass or more of the nitrite-type hydrocalumite per 100 parts by mass of the cement-based water-hardening material, the water-cured product of the undercoating material of the present invention has chloride ion adsorption capacity and nitrite ion release capacity. It will be excellent. As a result, the primer layer formed by the water-cured product exhibits excellent anticorrosion performance.
亜硝酸型ハイドロカルマイトがセメント系水硬化材100質量部に対し100質量部を超えて添加しても、その添加量の増分に見合う塩化物イオンの吸着能の増加が認められず経済的でなく、また本発明下塗り材と水との混和物の塗装性(ワーカビリティ)が低下し、かつまた本発明下塗り層の塗膜強度が低下する傾向にあり、好ましくない。亜硝酸型ハイドロカルマイト量は、セメント系水硬化材100質量部に対し、50質量部以下であることがより好ましい。 Even if the nitrous acid type hydrocalumite is added in excess of 100 parts by mass with respect to 100 parts by mass of the cement-based water-hardening material, the chloride ion adsorption capacity corresponding to the increment of the addition amount is not recognized and it is economical In addition, the paintability (workability) of the mixture of the primer of the present invention and water tends to decrease, and the coating strength of the primer layer of the present invention tends to decrease, which is not preferable. The amount of the nitrous acid type hydrocalumite is more preferably 50 parts by mass or less with respect to 100 parts by mass of the cement-based water-hardening material.
亜硝酸型ハイドロカルマイトは、先に述べた反応・結晶化方法により、通常5〜100μmの範囲の粉末物質として得られるが、反応条件を適正化させることにより、小粒子かつ粒子径範囲の狭い粉末として得ることが出来る。 Nitrite-type hydrocalumite is usually obtained as a powder substance in the range of 5 to 100 μm by the reaction and crystallization method described above, but by optimizing the reaction conditions, small particles and a narrow particle size range are obtained. It can be obtained as a powder.
本発明においては、市販の粉末状亜硝酸型ハイドロカルマイトを好適に使用することができる。入手可能な粉末状亜硝酸型ハイドロカルマイトとして、例えば、日本化学工業株式会社製「ソルカット」(日本化学工業株式会社登録商標)を挙げることが出来る。 In the present invention, commercially available powdered nitrous-type hydrocalumite can be suitably used. As powdery nitrous acid type hydrocalumite which can be obtained, for example, “Solkat” (Nippon Chemical Industry Co., Ltd. registered trademark) manufactured by Nippon Chemical Industry Co., Ltd. can be mentioned.
(D)再乳化形粉末樹脂
本発明下塗り材は再乳化形粉末樹脂を必須成分として含む。
再乳化形粉末樹脂は、本発明下塗り材の水硬化物の引っ張り強度、伸びを向上させると同時に鋼材との接着力を高める。下塗り材が再乳化形粉末樹脂を欠くと、下塗り層は鋼材との熱膨張率差に起因する歪みに抗しきれず、結果剥離やひび割れが生じてしまい、温度変化の激しい環境に耐えることが出来ない。
本発明において、下塗り層の補強を目的とする樹脂成分として再乳化形粉末樹脂を採用する理由は、以下の理由による。すなわち、本発明の主要成分を成す水硬化成分としてのセメント系水硬化材と、水硬化層への強度付与成分としての細骨材と、塩化物イオン捕捉成分としてのハイドロカルマイトと、再乳化形粉末樹脂成分とを、粉末状態のままミキサーにてあらかじめプレミックスすることが可能となり、結果下塗り層中に各成分がミクロに分散する。結果、下塗り材の塗装性が向上し、かつ水硬化した下塗り層の防食機能も高まる。
また、下塗層の補強を目的に、粉末状ではない樹脂成分、例えば樹脂エマルション等を使用する場合には、塗膜厚を確保するのに多くの塗布回数を必要とし、塗装施工性および塗膜の品質が悪くなる。
(D) Re-emulsifiable powder resin The primer of the present invention comprises a re-emulsifiable powder resin as an essential component.
The re-emulsifiable powder resin improves the tensile strength and elongation of the water-cured product of the primer of the present invention and at the same time enhances the adhesion to steel materials. If the primer material lacks the re-emulsifiable powder resin, the primer layer can not resist the distortion caused by the difference in thermal expansion coefficient with that of the steel material, and as a result, peeling and cracking occur, and it can withstand a severe temperature change environment. Absent.
In the present invention, the reason why the re-emulsifiable powder resin is employed as the resin component for reinforcing the undercoat layer is as follows. That is, a cement-based water-hardening material as a water-hardening component which forms the main component of the present invention, a fine aggregate as a strength-imparting component to a water-hardening layer, hydrocalumite as a chloride ion-trapping component, and re-emulsification It is possible to pre-mix the powdery resin component in a powdery state with a mixer as it is, and as a result, each component is micro-dispersed in the undercoat layer. As a result, the paintability of the primer material is improved, and the anticorrosion function of the water-cured primer layer is also enhanced.
In addition, when using resin components that are not in powder form, such as resin emulsions, for the purpose of reinforcing the undercoat layer, many coating operations are required to secure the coating thickness, and coating workability and coating are required. Membrane quality is degraded.
上記再乳化形粉末樹脂は、本発明下塗り材と水との混和物の造膜形成温度、及び本発明下塗り層の低温下での強度保持の観点から、そのガラス転移温度は10度C以下であることが好ましい。 The above re-emulsifiable powder resin has a glass transition temperature of 10 ° C. or less from the viewpoint of the film formation temperature of the mixture of the primer of the present invention and water and the strength retention of the primer of the present invention at low temperature. Is preferred.
再乳化形粉末樹脂としては、公知の再乳化形粉末樹脂を用いることが出来、具体的には基体樹脂が、(メタ)アクリル酸エステル系共重合体、エチレン酢酸ビニル共重合体(EVA)又は酢酸ビニル・ビニルバーサテート共重合体であるものを挙げることが出来る。また再乳化性能を高めるため、基体樹脂の一部がポリビニルアルコール鎖と結合しているものを用いることも出来る。 As the re-emulsifiable powder resin, a known re-emulsifiable powder resin can be used. Specifically, the base resin is a (meth) acrylic acid ester copolymer, an ethylene vinyl acetate copolymer (EVA) or Mention may be made of those which are vinyl acetate / vinyl versatate copolymers. Further, in order to enhance the re-emulsification performance, it is also possible to use one in which a part of the base resin is bonded to a polyvinyl alcohol chain.
本発明下塗り材においては、上記再乳化形粉末樹脂のうち、基体樹脂がアクリル酸エステル系樹脂であるもの(以下、アクリル酸エステル系再乳化形粉末樹脂という。)は、水硬化物により形成される下塗り層の塗膜の耐水性が優れるため特に好ましい。
上記アクリル酸エステル系再乳化形粉末樹脂としては、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸n−プロピル、(メタ)アクリル酸i−プロピル、(メタ)アクリル酸n−ブチル、(メタ)アクリル酸i−ブチル、(メタ)アクリル酸t−ブチル、(メタ)アクリル酸2エチルヘキシル、(メタ)アクリル酸ドデシル、(メタ)アクリル酸オクタデシルのいずれか又はこれらの二以上のモノマー単位から構成されるものを挙げることが出来、(メタ)アクリル酸を構成モノマー単位として含んでいても良い。
In the undercoating material of the present invention, among the above re-emulsifiable powder resins, those in which the base resin is an acrylic ester resin (hereinafter referred to as an acrylic ester re-emulsifiable powder resin) are formed of a water-cured product. It is particularly preferable because the coating film of the undercoat layer is excellent in water resistance.
As the above-mentioned acrylic acid ester type re-emulsifiable powder resin, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, (meth) acrylic acid n-butyl, i-butyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) acrylate or two of these The thing comprised from the above monomer unit can be mentioned, You may contain (meth) acrylic acid as a structure monomer unit.
本発明下塗り材に含まれる再乳化形粉末樹脂の量は、セメント系水硬化材100質量部に対し5質量部〜30質量部であることが好ましい。 It is preferable that the quantity of re-emulsifiable powder resin contained in this invention undercoat is 5 mass parts-30 mass parts with respect to 100 mass parts of cement-type water-hardening materials.
再乳化形粉末樹脂がセメント系水硬化材100質量部に対し5質量部以上含まれることにより、本発明下塗り材の水硬化物と鋼材との接着性がより向上し、結果本発明下塗り層の防食効果が増す。再乳化形粉末樹脂量は、セメント系水硬化材100質量部に対し、10質量部以上であることがより好ましい。 By containing the re-emulsifiable powder resin in an amount of 5 parts by mass or more based on 100 parts by mass of the cement-based water-hardening material, the adhesion between the water-cured product of the undercoating material of the present invention and the steel material is further improved. The anticorrosion effect increases. The amount of re-emulsifiable powder resin is more preferably 10 parts by mass or more with respect to 100 parts by mass of the cement-based water-hardening material.
また、再乳化形粉末樹脂量をセメント系水硬化材100質量部に対し30質量部以下とすることにより、亜硝酸型ハイドロカルマイトのキャリアー成分たるセメント系水硬化材の本発明下塗り材の水硬化物に占める割合を高く保つことが出来るので、本発明下塗り層の防食性能が損なわれることがない。再乳化形粉末樹脂はセメント系水硬化材100質量部に対し20質量部以下であることがより好ましい。 Further, by setting the amount of re-emulsifiable powder resin to not more than 30 parts by mass with respect to 100 parts by mass of cement-based water-hardening material, the water of the present invention undercoat material of cement-based water-curing material which is a carrier component of nitrite hydrocalumite. Since the proportion of the cured product can be kept high, the anticorrosion performance of the undercoat layer of the present invention is not impaired. The re-emulsifiable powder resin is more preferably 20 parts by mass or less with respect to 100 parts by mass of the cement-based water-hardening material.
(E)増粘剤
本発明下塗り材は増粘剤を必須成分として含む。
増粘剤は、本発明下塗り材と水との混和物に適正な粘度を付与し、鋼材表面への塗装性を高める。下塗り材が増粘剤を欠くと薄肉塗装が極めて困難となる。
(E) Thickener The primer of the present invention contains a thickener as an essential component.
The thickener imparts an appropriate viscosity to the mixture of the primer of the present invention and water to enhance the paintability on the steel surface. If the primer lacks a thickener, thin coating becomes extremely difficult.
増粘剤としては、メチルセルロース、エチルセルロース、ヒドロキシエチルセルロース、カルボキシメチルセルロースなどのセルロースエーテル類、ポリアクリルアミド、ポリエチレンオキサイド、ポリビニルアルコール、カゼインなどの各種の水溶性高分子のほか、キサンタンガム、ウェランガム、デュータンガムなどのポリサッカライドを挙げることができ、これらの一種又は二種以上を組み合わせて用いることができる。 Examples of the thickener include various water-soluble polymers such as cellulose ethers such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, polyacrylamide, polyethylene oxide, polyvinyl alcohol and casein, and polymers such as xanthan gum, welan gum and dutan gum. Saccharides can be mentioned, and one or two or more of these can be used in combination.
増粘剤として粉末系の増粘剤(E1)を採用することにより、本発明の他の粉末系の構成成分との併用により、鋼材防食用水硬化性粉末系下塗り材となし得る。粉末状増粘剤(E1)としては、市販品を好適に使用することが出来る。そのようなものとして、メチルセルロース系粉末増粘剤、ポリアクリル酸系粉末増粘剤などが挙げられる。 By employing a powder-based thickener (E1) as a thickener, it can be used as a water-curable powder-based undercoat material for steel corrosion prevention by using in combination with other powder-based constituents of the present invention. A commercial item can be used suitably as a powdery thickener (E1). As such a thing, a methylcellulose type powder thickener, a polyacrylic acid type powder thickener, etc. are mentioned.
本発明下塗り材に含まれる増粘剤の量は、セメント系水硬化材100質量部に対し、0.05質量部〜1質量部であることが好ましい。 It is preferable that the quantity of the thickener contained in this invention undercoat is 0.05 mass part-1 mass part with respect to 100 mass parts of cement-type water-hardening material.
増粘剤量がセメント系水硬化材100質量部に対し0.05質量部以上含まれることにより、本発明下塗り材と水との混和物が伸びやすくなり、良好な刷毛塗り性を付与する。増粘剤量は、0.1質量部以上であることがより好ましい。 When the thickener content is 0.05 parts by mass or more with respect to 100 parts by mass of the cement-based water-hardening material, the mixture of the primer of the present invention and water is easily extended, and good brush coatability is imparted. The amount of thickener is more preferably 0.1 parts by mass or more.
他方、増粘剤量をセメント系水硬化材100質量部に対し1質量部以下とすることにより、本発明下塗り材と水の混和物の粘度が高くなり過ぎることが無い。増粘剤量は、セメント系水硬化材100質量部に対し、0.5質量%以下であることがより好ましい。 On the other hand, by setting the amount of thickener to 1 part by mass or less with respect to 100 parts by mass of the cement-based water curing material, the viscosity of the mixture of the primer of the present invention and water does not become too high. The amount of the thickener is more preferably 0.5% by mass or less with respect to 100 parts by mass of the cement-based water curing material.
(F)消泡剤
本発明下塗り材は消泡剤を任意成分として含むことができる。
消泡剤は、本発明下塗り材と水とを混和する際に、泡立ちと空気の巻き込みを抑制する。その結果本発明下塗り層中の微細孔(ピンホール)の生成が抑制され、結果本発明下塗り層の防食機能が一層高まる。
(F) Antifoamer The primer of the present invention may contain an antifoamer as an optional component.
The antifoaming agent suppresses foaming and air entrainment when mixing the primer of the present invention with water. As a result, the formation of micropores (pinholes) in the subbing layer of the present invention is suppressed, and as a result, the anticorrosion function of the subbing layer of the present invention is further enhanced.
本発明において使用し得る消泡剤としては、アルコール系、ポリオール系、脂肪酸エステル系、酸化エチレン−酸化プロピレン系、シリコーン系などの各種の消泡剤が挙げられ、これらの一種又は二種以上を組み合わせて用いることができる。 Examples of the antifoaming agent that can be used in the present invention include various antifoaming agents such as alcohols, polyols, fatty acid esters, ethylene oxide-propylene oxide and silicones, and one or more of these antifoaming agents may be used. It can be used in combination.
消泡剤として粉末系の消泡剤(F1)を採用することにより、本発明の他の粉末系の構成成分との併用により、鋼材防食用粉末系下塗り材となし得る。粉末系消泡剤(F1)としては、市販品を好適に使用することが出来る。 By employing a powder-based antifoaming agent (F1) as the antifoaming agent, it can be used as a powder-based undercoating material for steel corrosion prevention by using in combination with other powder-based constituents of the present invention. A commercial item can be used conveniently as a powder type antifoamer (F1).
消泡剤の添加量は、セメント系水硬化材100質量部に対し、1質量部以下とすることが好ましい。1質量部を超えて加えても、消泡効果はそれ以上向上しにくくなり、経済的でない。消泡効果と経済性のバランスから、消泡剤の添加量は、0.05〜0.5質量部がより好ましく、0.1〜0.4質量部がさらに好ましい。 It is preferable that the addition amount of an antifoamer sets it as 1 mass part or less with respect to 100 mass parts of cement-type water-hardening materials. Even if it is added in excess of 1 part by mass, the defoaming effect is difficult to improve any more and is not economical. From the balance of the defoaming effect and economic efficiency, the addition amount of the antifoaming agent is more preferably 0.05 to 0.5 parts by mass, and further preferably 0.1 to 0.4 parts by mass.
(G)流動性改良剤
本発明下塗り材は流動性改良剤を任意成分として含むことができる。本発明にて流動性改良剤とは、その分散効果によりセメント系水硬化材粒子の凝集を抑制し、本発明下塗り材と水との混和物の流動性を高める効果を奏するものである。本発明の流動性改良剤には、当業者にはその性能により、減水剤、AE減水剤、高性能AE減水剤として知られているもののほか、セメント系水硬化材と水との混練物に、後添加して混和し、攪拌することにより、当該混練物の流動性を増大させる効果を有する混和剤(当業者には流動化剤として知られている)が含まれる。
(G) Flowability improver The primer of the invention may contain a flowability improver as an optional component. In the present invention, the fluidity improver suppresses aggregation of cement-based water-hardening particles by its dispersing effect, and has the effect of enhancing the fluidity of the mixture of the primer and water of the present invention. The fluidity improver of the present invention may be a mixture of a cement-based water curing agent and water, in addition to those known to those skilled in the art as a water reducing agent, an AE water reducing agent, and a high performance AE water reducing agent. An admixture (known to those skilled in the art as a fluidizing agent) is included, which has the effect of increasing the fluidity of the kneaded product by post-addition mixing and stirring.
上記の減水剤としては、リグニンスルホン酸塩やオキシカルボン酸塩を主成分とするものを挙げることが出来る。AE減水剤としては、ポリオール系のものを挙げることが出来る。高性能AE減水剤としてはポリカルボン酸系、ナフタリン系、メラミン系、アミノスルホン酸系のものを挙げることが出来る。また流動化剤としては、ナフタリンスルホン酸ホルムアルデヒド高縮合物塩、メラミンスルホン酸ホルムアルデヒド縮合物塩、ポリカルボン酸の水溶性塩、スチレンスルホン酸共重合物塩を挙げることが出来る。 Examples of the water reducing agent include those containing lignin sulfonate and oxycarboxylate as main components. As an AE water reducing agent, the thing of a polyol type can be mentioned. Examples of the high performance AE water reducing agent include polycarboxylic acids, naphthalenes, melamines and aminosulfonic acids. Examples of the fluidizing agent include naphthalene sulfonic acid formaldehyde high condensate salt, melamine sulfonic acid formaldehyde condensate salt, water-soluble salt of polycarboxylic acid, and styrene sulfonic acid copolymer salt.
これらのうち、ポリカルボン酸塩は、少量で高い分散・流動性改良効果を発揮するため好ましい。
ポリカルボン酸塩としては、ポリアクリル酸塩、ポリアクリルアミド部分加水分解物、オレフィン−マレイン酸共重合体、スチレン−マレイン酸共重合体、スチレン−マレイン酸(ポリオキシエチレン)エステル共重合体、アリル(EO)エーテル−無水マレイン酸−スチレン共重合体、アリル(EO)エーテル−マレイン酸−スチレン共重合体などを挙げることが出来る。
Among these, polycarboxylic acid salts are preferable because they exhibit high dispersion and fluidity improvement effects in small amounts.
As polycarboxylic acid salts, polyacrylates, polyacrylamide partial hydrolysates, olefin-maleic acid copolymers, styrene-maleic acid copolymers, styrene-maleic acid (polyoxyethylene) ester copolymers, allyl Examples include (EO) ether-maleic anhydride-styrene copolymer, allyl (EO) ether-maleic acid-styrene copolymer and the like.
流動性改良剤として粉末系流動性改良剤(G1)を採用することにより、本発明の他の粉末系の構成成分との併用により、鋼材防食用粉末系下塗り材となし得る。粉末系流動性改良剤(G1)としては、市販品を好適に使用することが出来る。 By employing a powder type flowability improver (G1) as a flowability improver, it can be made into a powder type undercoat material for steel corrosion prevention by using in combination with other powder type components of the present invention. A commercial item can be used suitably as a powder type | system | group fluidity | liquidity modifier (G1).
流動性改良剤の添加量は、セメント系水硬化材100質量部に対して、1質量部以下とすることが好ましい。1質量部を超えて加えても、流動性はそれ以上向上しにくく、経済的でない。流動性の向上と経済性のバランスから、流動性改良剤の添加量は、0.05〜0.7質量部がより好ましく、0.1〜0.5質量部がさらに好ましい。 The addition amount of the flowability modifier is preferably 1 part by mass or less with respect to 100 parts by mass of the cement-based water-hardening material. Even if it is added in excess of 1 part by mass, the fluidity is hardly improved further and is not economical. From the balance of the improvement of fluidity and economy, the addition amount of the fluidity improver is more preferably 0.05 to 0.7 parts by mass, and further preferably 0.1 to 0.5 parts by mass.
<鋼材防食用粉末組成物>
本発明下塗り材を構成する上記(A)〜(D)の各必須成分はいずれも粉末状成分である。従い、上記(E)〜(G)の各任意成分がいずれも粉末状である場合には、これら粉末成分をあらかじめ所望の比率にて配合し、プレミックスした鋼材防食用粉末系下塗り材とすることが出来る。プレミックスするためのミキサーとしては、タンブラーミキサー、V型混合機などのミキサーを好適に用いることができる。かかる粉末系下塗り材は、塗装するに際して、当該粉末系下塗り材と水とを混和するだけで、水硬化性の鋼材防食用塗材を調製することが出来るため、現場作業性に優れる。
<Powder composition for steel corrosion prevention>
Each essential component of said (A)-(D) which comprises this invention undercoat is a powdery component. Therefore, when each of the above optional components (E) to (G) is in powder form, these powder components are blended beforehand in a desired ratio to obtain a powder based undercoat material for corrosion protection of steel material which has been premixed. I can do it. As a mixer for premixing, mixers, such as a tumbler mixer and a V-type mixer, can be used suitably. Such a powder-based undercoating material is excellent in on-site workability because a water-curable coating material for corrosion protection of a steel material can be prepared only by mixing the powder-based undercoating material with water when painting.
本発明の下塗り材は、増粘剤の効果により、塗装液が塗装表面に良く伸び、かつ、一定膜厚の均一塗膜が得られ、塗装性が良好となり、刷毛塗り、ローラー塗装などの通常の塗装方法を採用することが出来る。また本発明の下塗り材は、塗装性に優れるため、重ね塗りをせずとも均一かつ平滑な下塗り層を形成することが出来る。 In the undercoating material of the present invention, the effect of the thickener is that the coating liquid is well-stretched on the coating surface, and a uniform coating film having a constant film thickness is obtained, the coating property becomes good, and brush coating, roller coating, etc. The usual painting method can be adopted. In addition, since the primer of the present invention is excellent in paintability, a uniform and smooth primer layer can be formed without recoating.
本発明の目的からは、下塗り層の厚さは50〜500μmの範囲であることが好ましく、100〜400μmの範囲であることがより好ましい。 For the purpose of the present invention, the thickness of the undercoat layer is preferably in the range of 50 to 500 μm, and more preferably in the range of 100 to 400 μm.
下塗り材を塗装した後、好ましくは24時間以上の時間をおいて、水硬化させる。 After the primer is applied, it is preferably allowed to cure in water for 24 hours or more.
本発明の下塗り材、防食塗装方法、防食鋼材により、鋼材を塩害から防止し、鋼材構造物の寿命を延ばすことができる。 By the undercoating material, the anticorrosion coating method, and the anticorrosion steel material of the present invention, the steel material can be prevented from salt damage, and the life of the steel structure can be extended.
以下、実施例にて本発明の内容を具体的に説明する。
なお、以下の実施例、比較例においては、下記試験方法によった。
Hereinafter, the contents of the present invention will be specifically described by way of examples.
In the following examples and comparative examples, the following test methods were used.
<試験用鋼材>
縦150mm、横100mm、厚さ1mmの、JIS K5600 1−4に規定するみがき鋼板を試験用鋼材とする。
<Steel steel for testing>
A polished steel plate specified in JIS K5600 1-4, which is 150 mm long, 100 mm wide, and 1 mm thick, is used as a test steel material.
<塩水噴霧試験>
試験用鋼材に順次下塗り、中塗り及び上塗り塗装を施した試験片に、クロスカットを入れる(カットを入れた試験片を「クロスカット試験片」と称する。)。クロスカット試験片を温度35℃に保った恒温室に置き、5%濃度食塩水を噴霧させる。300時間、500時間、800時間、1000時間、1500時間、及び2000時間経過後の試験片の状態を観察する。
<Salt spray test>
A cross cut is put on a test piece in which a primer, an intermediate coat and a top coat are sequentially applied to a steel for test (a test piece having a cut is referred to as a "cross cut test piece"). The crosscut test piece is placed in a temperature-controlled room maintained at a temperature of 35 ° C., and a 5% saline solution is sprayed. The condition of the test piece after 300 hours, 500 hours, 800 hours, 1000 hours, 1500 hours and 2000 hours is observed.
[実施例1]
1)下塗り材の調製と下塗り層の形成
下記組成にて各成分を配合し、ミキサーにて均一に混合して、粉末系下塗り材を調製した;
・早強ポルトランドセメント:100質量部、
・珪砂(粒子径500μm以上の成分が10質量%以下の市販品):90質量部、
・亜硝酸型ハイドロカルマイト(日本化学工業社製):15質量部、
・アクリル酸エステル系再乳化形粉末樹脂(ガラス転移温度10度C):14質量部、
・セルロース系増粘剤(粉末):0.2質量部、
・粉末系消泡剤:0.2質量部、
・粉末系流動性改良剤:0.3質量部。
調製した上記粉末系下塗り材の総量に水35質量部を加え、ミキサーにて均一に混合した。その混和物を試験用鋼材に塗装して、下塗り層を形成した。下塗り材の塗装性は良好で、重ね塗りを要することなく、一回の刷毛塗りにて、均一かつ平滑な下塗り層を形成することができた。下塗り層の厚さは300μmであった。下塗り塗装後、48時間経過させ、水硬化させた。
2)中塗り層及び上塗り層の形成
上記下塗り層に重ねて、弱溶剤2液エポキシ樹脂塗料(エポロMPプライマー、イサム塗料社製)を中塗り材として中塗り塗装をした。中塗り層の厚さは60μmであった。中塗り層形成後10時間をおいて、上記中塗り層に重ねて強溶剤2液系ウレタン樹脂塗料(ハイアート3000、イサム塗料社製)を上塗り材として上塗り塗装をした。上塗り層の厚さは30μmであった。かくして防食性能試験片を作成した。
3)塩水噴霧試験
上記防食性能試験片にクロスカットを入れ、当該クロスカット試験片を温度35℃に保った恒温室に置き、5%濃度食塩水を噴霧させた。300時間、500時間、800時間、1000時間、1500時間、及び2000時間経過後の試験片表面の状態を観察した。結果を表1、図2〜4に示す。
Example 1
1) Preparation of undercoating material and formation of undercoating layer Each component was compounded according to the following composition and uniformly mixed by a mixer to prepare a powder-based undercoating material;
-Early strength Portland cement: 100 parts by mass,
90 parts by mass of silica sand (commercially available product having a particle diameter of 500 μm or more and 10% by mass or less)
Nitrite type hydrocalumite (manufactured by Nippon Chemical Industrial Co., Ltd.): 15 parts by mass,
-14 parts by mass of acrylic ester-based re-emulsifiable powder resin (glass transition temperature 10 ° C.)
Cellulose-based thickener (powder): 0.2 parts by mass,
Powder antifoaming agent: 0.2 parts by mass,
Powder system flowability improver: 0.3 parts by mass.
35 parts by mass of water was added to the total amount of the prepared powder base primer and uniformly mixed with a mixer. The blend was applied to a test steel to form a primer layer. The coatability of the undercoating material was good, and it was possible to form a uniform and smooth undercoating layer by one brushing without requiring recoating. The thickness of the undercoat layer was 300 μm. After undercoating, it was water cured for 48 hours.
2) Formation of middle coat layer and top coat layer It piled up on the above-mentioned ground coat layer, middle coat coating was performed by using a weak solvent 2-liquid epoxy resin paint (Epolo MP primer, manufactured by Isam Paint Co., Ltd.) as a middle coat material. The thickness of the middle coat layer was 60 μm. Ten hours after the formation of the middle coat layer, it was overlaid on the middle coat layer and coated with a strong solvent two-component urethane resin paint (Hyart 3000, manufactured by Isam Paint Co., Ltd.) as a top coat material. The thickness of the overcoat layer was 30 μm. Thus, corrosion resistance test pieces were prepared.
3) Salt spray test A crosscut was placed on the above anticorrosion performance test piece, the crosscut test piece was placed in a thermostatic chamber maintained at a temperature of 35 ° C., and a 5% saline solution was sprayed. The surface condition of the test piece was observed after 300 hours, 500 hours, 800 hours, 1000 hours, 1500 hours, and 2000 hours. The results are shown in Table 1 and FIGS.
[比較例1]
実施例1の下塗り材の調製において、亜硝酸型ハイドロカルマイトを加えなかった他は同様にして下塗り材を調製した。次いで実施例1にて用いたと同一の中塗り材、上塗り材を用いて、同様にして、防食性能試験片、次いでクロスカット試験片を作成し、塩水噴霧試験を行った。結果を表1、図2〜4に示す。
Comparative Example 1
A primer was prepared in the same manner as in the preparation of the primer of Example 1, except that no nitrite type hydrocalumite was added. Subsequently, using the same middle coat material and top coat material as used in Example 1, a corrosion resistance test specimen and then a crosscut test specimen were similarly prepared and subjected to a salt spray test. The results are shown in Table 1 and FIGS.
[比較例2]
実施例1において、セルロース系増粘剤を加えなかった他は同様にして、下塗り材を調製した。次いで防食性能試験片、次いでクロスカット試験片を作成し、塩水噴霧試験を行った。結果を表1に示す。なお、下塗り材の塗装性は不良であった。すなわち、塗液の伸びが悪く、鋼材表面に均一な塗面を形成するのが困難であり、平均厚さ300μmの下塗り層を形成させるのに都合三回の重ね塗りを要した。
Comparative Example 2
A primer was prepared in the same manner as in Example 1 except that no cellulose thickener was added. Then, anticorrosion performance test pieces and then cross cut test pieces were prepared and subjected to a salt spray test. The results are shown in Table 1. The paintability of the undercoating material was poor. That is, it was difficult to form a uniform coated surface on the surface of the steel material because the coating solution did not stretch well, and three overcoatings were required to form an undercoat layer having an average thickness of 300 μm.
[試験例3]
実施例1において、中塗り材として、弱溶剤エポキシ樹脂塗料に代え、水性エポキシ樹脂塗料を用いた他は同様にして、防食性能試験片、次いでクロスカット試験片を作成し、塩水噴霧試験を行った。結果を表1に示す。
[Test Example 3]
In Example 1, in place of the weak solvent epoxy resin paint as the middle coat material and using the aqueous epoxy resin paint in the same manner, an anticorrosive performance test piece and then a cross cut test piece are prepared and a salt spray test is conducted. The The results are shown in Table 1.
[試験例4]
実施例1において、中塗り材として、弱溶剤エポキシ樹脂塗料に代え、強溶剤エポキシ樹脂塗料を用いた他は同様にして、防食性能試験片、次いでクロスカット試験片を作成し、塩水噴霧試験を行った。結果を表1に示す。
[Test Example 4]
In Example 1, in place of the weak solvent epoxy resin paint and using a strong solvent epoxy resin paint as the middle coat material, a corrosion protection test specimen and then a cross cut test specimen are prepared in the same manner as in the salt spray test. went. The results are shown in Table 1.
[実施例2]
実施例1において、上塗り材として、シリコーン樹脂塗料を用いたほかは同様にして、防食性能試験片、次いでクロスカット試験片を作成し、塩水噴霧試験を行った。2000時間経過後も、試験片表面に変化は認められなかった。
Example 2
In Example 1, an anticorrosion performance test piece and then a cross cut test piece were prepared in the same manner as in Example 1 except that a silicone resin paint was used as a top coat material, and a salt spray test was conducted. No change was observed on the surface of the test piece even after 2000 hours.
[実施例3]
実施例1において、上塗り材として、フッ素樹脂塗料を用いたほかは同様にして、防食性能試験片、次いでクロスカット試験片を作成し、塩水噴霧試験を行った。2000時間経過後も、試験片表面に変化は認められなかった。
[Example 3]
In Example 1, an anticorrosive performance test piece and then a cross cut test piece were prepared in the same manner as in Example 1 except that a fluorine resin paint was used as a top coat material, and a salt spray test was conducted. No change was observed on the surface of the test piece even after 2000 hours.
[参考例1]
実施例1において、再乳化形粉末樹脂14質量部に代えて、アクリル酸エステル樹脂エマルジョン14質量部(固形分換算)を用いた他は同様にして、防食性能試験片、次いでクロスカット試験片を作成し、塩水噴霧試験を行った。1000時間経過時では、クロスカット部に錆(錆幅:1.6mm)が認められた。1500時間経過時では、錆の成長(錆幅3.0mm)とともに、膨れが認められた。2000時間経過時では、錆がさらに成長するとともに(錆幅5.2mm)、膨れがさらに増大していた。結果を図2〜4に示す。
なお、下塗り材の塗装性は不良であった。すなわち、塗液の伸びが悪く、鋼材表面に均一な塗面を形成するのが困難であった。すなわち、刷毛塗装時、均一な塗膜が出来ず、下地が透けて極端に薄塗りとなる箇所が生じた。そのため厚さ300μmの均一な下塗り層を形成させるのに三回以上の重ね塗りを要した。
[Reference Example 1]
In Example 1, in place of 14 parts by mass of re-emulsifiable powder resin, 14 parts by mass of acrylic acid ester resin emulsion (in terms of solid content) were used, and in the same manner, test pieces for corrosion resistance and then crosscuts It made and did salt spray test. After 1000 hours, rust (rust width: 1.6 mm) was observed at the cross cut portion. After 1500 hours, swelling was observed along with rust growth (rust width 3.0 mm). After 2000 hours, as rust further grew (rust width 5.2 mm), blistering further increased. The results are shown in FIGS.
The paintability of the undercoating material was poor. That is, it was difficult to form a uniform coated surface on the surface of the steel material due to the poor elongation of the coating solution. That is, at the time of brush coating, a uniform coating film could not be formed, and there were places where the base was transparent and the coating was extremely thin. Therefore, three or more overcoatings were required to form a uniform undercoat layer with a thickness of 300 μm.
1. 鋼材
2.下塗り層
3.中塗り層
4.上塗り層
1. Steel 2. Subbing layer 3. Middle coat layer 4. Top layer
Claims (8)
The powder base primer for corrosion protection of steel according to any one of claims 4, 5 or 7, wherein the latent hydraulic material is ground granulated blast furnace slag.
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CN111748229A (en) * | 2020-07-01 | 2020-10-09 | 杭州铁木辛柯建筑结构设计事务所有限公司 | Indoor type anticorrosion interface agent suitable for surfaces of bare steel and galvanized steel sheets |
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JPS51150536A (en) * | 1975-06-20 | 1976-12-24 | Toagosei Chem Ind Co Ltd | Water proof under-coating composition for structure |
JPS56164048A (en) * | 1980-05-20 | 1981-12-16 | Kowa Chem Ind Ltd | Water undercoating paint composition and painting method thereby |
JPH07115900B2 (en) * | 1990-10-19 | 1995-12-13 | 財団法人鉄道総合技術研究所 | Chlorine ion scavenger |
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JP3023406B2 (en) * | 1995-06-21 | 2000-03-21 | 太平洋セメント株式会社 | Cement-based base adjustment composition |
JP2003306367A (en) * | 2002-04-11 | 2003-10-28 | Toagosei Co Ltd | Composition for repairing reinforced concrete and repairing method using it |
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