CN114592186A - 一种锌粉的无铬钝化方法 - Google Patents
一种锌粉的无铬钝化方法 Download PDFInfo
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000002161 passivation Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 239000011701 zinc Substances 0.000 claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 21
- -1 silver hexafluoroantimonate Chemical compound 0.000 claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims abstract description 10
- 239000008367 deionised water Substances 0.000 claims abstract description 10
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 10
- 239000003960 organic solvent Substances 0.000 claims abstract description 10
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 239000011733 molybdenum Substances 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims description 10
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- DHRLEVQXOMLTIM-UHFFFAOYSA-N phosphoric acid;trioxomolybdenum Chemical compound O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.OP(O)(O)=O DHRLEVQXOMLTIM-UHFFFAOYSA-N 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
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- VLAPMBHFAWRUQP-UHFFFAOYSA-L molybdic acid Chemical compound O[Mo](O)(=O)=O VLAPMBHFAWRUQP-UHFFFAOYSA-L 0.000 claims description 3
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 3
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 2
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 150000002170 ethers Chemical class 0.000 claims description 2
- 150000002576 ketones Chemical class 0.000 claims description 2
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000049 pigment Substances 0.000 abstract description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 description 12
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- 230000000694 effects Effects 0.000 description 5
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 3
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 3
- DUEPRVBVGDRKAG-UHFFFAOYSA-N carbofuran Chemical compound CNC(=O)OC1=CC=CC2=C1OC(C)(C)C2 DUEPRVBVGDRKAG-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
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- 239000000463 material Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- CUDYYMUUJHLCGZ-UHFFFAOYSA-N 2-(2-methoxypropoxy)propan-1-ol Chemical compound COC(C)COC(C)CO CUDYYMUUJHLCGZ-UHFFFAOYSA-N 0.000 description 2
- 229940058020 2-amino-2-methyl-1-propanol Drugs 0.000 description 2
- WWWFHFGUOIQNJC-UHFFFAOYSA-N 2-hydroxy-3-nitrobenzoic acid Chemical compound OC(=O)C1=CC=CC([N+]([O-])=O)=C1O WWWFHFGUOIQNJC-UHFFFAOYSA-N 0.000 description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 2
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
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- 238000001723 curing Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000000758 substrate Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical compound [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 2
- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 description 1
- 241001136782 Alca Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
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- 239000003924 oil dispersant Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- RLJWTAURUFQFJP-UHFFFAOYSA-N propan-2-ol;titanium Chemical compound [Ti].CC(C)O.CC(C)O.CC(C)O.CC(C)O RLJWTAURUFQFJP-UHFFFAOYSA-N 0.000 description 1
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- 238000005245 sintering Methods 0.000 description 1
- YWQIGRBJQMNGSN-UHFFFAOYSA-M sodium;1,4-dioxo-1,4-di(tridecoxy)butane-2-sulfonate Chemical compound [Na+].CCCCCCCCCCCCCOC(=O)CC(S([O-])(=O)=O)C(=O)OCCCCCCCCCCCCC YWQIGRBJQMNGSN-UHFFFAOYSA-M 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- VXUYXOFXAQZZMF-UHFFFAOYSA-N tetraisopropyl titanate Substances CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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Classifications
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
- C23C22/44—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also fluorides or complex fluorides
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
- C23C22/42—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also phosphates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
本发明公开了一种锌粉的无铬钝化方法;将水油通用的分散助剂加入到水溶性有机溶剂中,搅拌均匀;往混合均匀的介质中加入锌粉,搅拌均匀;加入去离子水,含钼化合物,六氟锑酸银并搅拌均匀,制得钝化好的水性锌浆。传统锌粉的锌粉钝化方法,会把锌粉完全包裹,使得锌粉失去防锈颜料的作用。本发明提供一种的锌粉的无铬钝化方法,既可以使得锌粉在水中稳定储存超过6个月,又可以让锌粉电化学保护的功能不丧失。
Description
技术领域
本发明涉及一种锌粉无铬钝化技术;具体涉及一种既可以使得锌粉在水中稳定储存超过6个月、又可以让锌粉电化学保护的功能不丧失的锌粉的无铬钝化方法。
背景技术
目前市面富锌涂料作为重防腐的涂料,具有其它涂料不可比拟的防腐蚀性能。但由于富锌涂料中的锌粉会和水反应,这大大影响了富锌涂料的水性化。
现在市面上水性富锌涂料通常是双组份,锌粉和水性的另一组分在使用的时候临时混合。这通常会导致适用期很短,现场操作困难和VOC过高等问题。
中国专利CN104356938B公开一种无铬水性金属防腐涂料及制备方法,其制备方法是先将球状锌粉﹑球状铝粉与溶剂油混合﹐再加入MoO粉搅拌均匀,将球状锌粉和球状铝粉加工成片状锌粉和片状铝粉,制成钝化片状锌铝混合粉浆;将片状锌铝混合粉浆和分散助剂、表面活性剂在搅拌条件下混合,制成A组分;将硅烷偶联剂、硼酸和去离子水混合水解,制成B组分;在使用前将A、B两组分按1:1.3~1.4的重量比例混合搅拌均匀,可刷涂、喷涂或浸涂方式进行涂装;采用加热烧结固化。其钝化效果很差,在专利中也提出,钝化后的涂料并不能长期储存。
中国专利CN109778159A公开了一种以磷钼酸作为钝化剂的水性无铬锌铝防腐涂料,包括如下质量份数比的各组分:锌粉250-310、铝粉10-30、磷钼酸3-10、聚乙二醇110-150、硅烷偶联剂70-140、乙二醇乙醚醋酸酯3-8、表面活性剂1-18、消泡剂1-6、钛酸四异丙酯10-60、硼酸10-18、去离子水380-480。然而此方法对与锌粉的钝化效果也很一般,如其专利所说:其涂料在热储测试中,24小时热储存之后,涂料粘度增加了20%,说明其钝化效果并不是很好。
中国专利CN113445035A公开了一种新的锌粉钝化方法:使用2-羟基-3-硝基苯甲酸为钝化剂,2-氨基-2-甲基-1-丙醇为pH中和剂,二丙二醇甲醚、丙酮为溶剂。使用此方法钝化的锌粉,可以在水中稳定储存超过6个月。但是此方法使得锌粉被完全包裹,失去了作为防锈颜料的功能。
因此,目前市面上缺少这种锌粉钝化的技术:既能使得锌粉稳定存储超过六个月,又不丧失锌粉作为防锈颜料的功能。
发明内容
本发明的目的在于针对上述现有技术存在的不足,提供一种锌粉的无铬钝化方法,既可以使得锌粉在水中稳定储存超过6个月,又可以让锌粉电化学保护的功能不丧失。
本发明的目的是通过以下技术方案来实现的:
本发明涉及一种锌粉的无铬钝化方法,所述方法包括如下步骤:
S1、将水油通用的分散助剂加入到水溶性有机溶剂中,搅拌均匀;
S2、往S1步骤混合均匀的介质中加入锌粉,搅拌均匀;
S3、往S2步骤混合均匀的介质中加入去离子水,含钼化合物,六氟锑酸银并搅拌均匀,制得钝化好的水性锌浆。
其中,步骤S2中搅拌均匀后,为了确保混合均匀,进行二次搅拌20-90分钟。
步骤S3中搅拌均匀后,为了确保混合均匀,进行二次搅拌20-90分钟。
使用本钝化方法钝化后,锌粉可以长期在水中储存,且不影响锌粉的电化学性能(即锌粉作为防锈颜料的功能)。
作为本发明的一个实施方式,所述水溶性有机溶剂可以是与去离子水无限混溶的醇类,醚类,酮类和它们的混合物。
作为本发明的一个实施方式,所述水溶性有机溶剂的质量为锌粉质量的0.5-2倍数。低于0.5倍会导致混合物粘度过大,2倍以上会导致产品VOC含量过高。
作为本发明的一个实施方式,所述水油通用的分散助剂为既能溶解于上述水溶性有机溶剂,又能溶于水的分散助剂。其既可以是水油两用分散剂,如湛新公司的ADDITOLVXW 6208,BYK2012等,也可以是一些水油均可溶的硅烷偶联剂如γ-缩水甘油醚氧丙基三甲氧基硅烷(SILQUEST A187),γ-缩水甘油醚氧丙基三乙氧基硅烷,γ-氨丙基三乙氧基硅烷等。
作为本发明的一个实施方式,所述水油两用分散剂用量为锌粉质量的3-10%。优先选择ADDITOL VXW 6208,其用量为锌粉质量的3-10%。
作为本发明的一个实施方式,所述硅烷偶联剂用量为锌粉质量的5-50%。优先选择KH560,其用量为锌粉质量的5-50%。
作为本发明的一个实施方式,所述去离子水为正常市售的去离子水。
作为本发明的一个实施方式,所述钼化合物可以是钼酸盐,钼酸,磷钼酸,三三氧化钼以及它们的组合。含钼化合物作为本方法主要的腐蚀抑制剂或者钝化剂,其添加量为最终制得水性锌浆总质量的0.5-7%,更优选择是1-3%。
作为本发明的一个实施方式,所述六氟锑酸银为白色至淡黄色结晶粉末。其用量为锌粉质量的0.1-2%,更优选择是0.5-1%。量太少不起作用,量太多成本太贵。六氟锑酸银中的六氟锑酸根阴离子属于正八面体的稳定结构,它的配位能力,也就是提供电子对的能力很弱,属于非配位阴离子,所以其对银离子的吸引也很弱,正因为这样所以银离子变得很活泼,容易与其它物质形成阳离子自由基,也正是因为它的这一性质使它成为了一种性能非常好的催化剂,比起一般的催化剂,它的选择性更高,稳定性更高,使用寿命更长。正因为这样的原因,由于六氟锑酸银的存在,可以使得锌粉的表面很容易被全面的氧化成Zn2+,这样使得含钼化合物(如三氧化钼)的钝化更加的彻底和有效。另外由于锌粉的表面没有形成不导电的化合物,所以对锌粉的电化学性能影响不大。
作为本发明的一个实施方案,步骤S2中,锌粉为球状锌粉或片状锌粉。
作为本发明的一个实施方案,所述锌粉粒径D50为0.1-200um。
作为本发明的一个实施方案,步骤S1至S3中,搅拌为常温机械搅拌。
锌粉的钝化对于水性富锌涂料的使用具有深远意义。如果锌粉的钝化做不好,水性富锌的储存和使用会大大受影响。甚至有的水性富锌涂料还未出厂,其锌粉已经和水反应导致涂料性能大大减低或失效。所以锌粉钝化的效果越好,越能减少水性富锌涂料的失效。一般水性富锌涂料中的水性树脂建议使用期是6个月,如果能使锌粉钝化后在水性稳定储存6个月,那锌粉不再是影响水性涂料储存期的短板。
与现有技术相比,本发明具有如下的有益效果:
1)本发明开发了一种锌粉无铬钝化方法,此方法生产工艺简单易行,对环境设备要求低。
2)本发明开发了一种新的锌粉无铬钝化方法,此方法制得的锌粉稳定性好,能在水性温度超过6个月。
3)本发明开发了一种新的锌粉无铬钝化方法,此方法制得的锌粉稳定性好,电化学性能不受影响。
具体实施方式
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明,但不以任何形式限制本发明。应当指出的是,对本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进。这些都属于本发明的保护范围。
下述具体实施方式中,试验所选用的材料:
六氟锑酸银购自百灵威公司;
二丙二醇甲醚、二丙二醇,2-氨基-2-甲基-1-丙醇购自陶氏公司;
锌粉购自爱卡公司,1000目锌粉。
三氧化钼(MoO3):D50 5um,购自百灵威化学。
磷钼酸:购自安耐吉化学。
钼酸铵:购自安耐吉化学
钼酸:购自国药集团
2-羟基-3-硝基苯甲酸、丙酮购自百灵威公司
SILQUEST A187:购自迈图公司
实施例1-15
实施例1-15涉及一种锌粉钝化方法,具体包括如下步骤:
S1、将水油通用的分散助剂加入到水溶性有机溶剂中,搅拌均匀;
S2、往S1步骤混合均匀的介质中加入锌粉,搅拌均匀;
S3、往S2步骤混合均匀的介质中加入去离子水,含钼化合物,六氟锑酸银并搅拌均匀,制得钝化好的水性锌浆。
其中,步骤S2中搅拌均匀后,为了确保混合均匀,进行二次搅拌20-90分钟。
步骤S3中搅拌均匀后,为了确保混合均匀,进行二次搅拌20-90分钟。制得水性锌浆。
本发明实施例1-15的锌粉钝化方法所涉及的物质及工艺参数如下表1、表2所示。
表1
表2
对比例1-4
对比例1-4涉及一种锌粉钝化方法,步骤同实施例1;对比例1-8的锌粉钝化方法所涉及的物质及工艺参数如下表3、4所示。
表3
注:SILQUEST A187:γ-环氧丙氧丙基三甲氧基硅烷、AEROSOL TR70:阴离子表面活性剂。
表4
钝化稳定性效果测试
测试结果如表5、6所示:
表5实施例1-15水中产气量测试(量筒排水法测试体积)
1周产氢气量 | 6个月产氢气量 | |
实施例1 | <0.1ml | 0.4ml |
实施例2 | <0.1ml | 0.5ml |
实施例3 | <0.1ml | 0.5ml |
实施例4 | <0.1ml | 0.5ml |
实施例5 | <0.1ml | 0.6ml |
实施例6 | <0.1ml | 0.5ml |
实施例7 | <0.1ml | 0.5ml |
实施例8 | <0.1ml | 0.5ml |
实施例9 | <0.1ml | 0.3ml |
实施例10 | <0.1ml | 0.5ml |
实施例11 | 10ml | 91ml |
实施例12 | <0.1ml | 0.6ml |
实施例13 | 67ml | 192ml |
实施例14 | 1107ml | 1192ml |
实施例15 | 1185ml | 1256ml |
表6对比例1-4水中6个月产气量测试(量筒排水法测试体积)
1周产氢气量 | 6个月产氢气量 | |
对比例1 | 11ml | 86ml |
对比例2 | 95ml | 2114ml |
对比例3 | 1145ml | 1207ml |
对比例4 | <0.1ml | 0.4ml |
钝化后锌浆防腐性能测试
以实施例1和对比例4制得的锌浆来进行钝化后锌浆防腐性能测试;实施例1和对比例4的防腐涂料的组成分别如表7、8所示。防腐测试是根据ASTMB117的中性盐雾测试标准进行。配置好的组合物通过喷涂方式涂布于打磨的钢板之上,涂覆物的干膜厚度约为50um。具体施工参数和结果见表9:
表7
1湛新公司,水性环氧树脂,环氧当量650-850
2毕克公司,基材润湿剂
3亚什兰公司消泡剂
4亚什兰公司增稠剂
5湛新公司水性固化剂,胺值220-240
表8
表9、防腐性能测试结果
综上所述,本发明提供一种锌粉的无铬钝化方法。锌粉在水中容易和水发生反应而产生氢气,从而导致锌粉失效。锌粉常被用于富锌底漆中防锈颜料,主要起道电化学保护作用。其机理是:金属锌比钢铁活泼,容易失去电子,在腐蚀前期过程中,锌粉和钢铁基材组成原电池,锌为阳极(通常称作牺牲阳极),铁为阴极,电流由锌流向铁,钢铁基材便得到了阴极保护。但是传统锌粉的锌粉钝化方法,会把锌粉完全包裹,使得锌粉失去防锈颜料的作用。而本发明提供的锌粉的无铬钝化方法,既可以使得锌粉在水中稳定储存超过6个月,又可以让锌粉电化学保护的功能不丧失。
以上对本发明的具体实施例进行了描述。需要理解的是,本发明并不局限于上述特定实施方式,本领域技术人员可以在权利要求的范围内做出各种变形或修改,这并不影响本发明的实质内容。
Claims (10)
1.一种锌粉的无铬钝化方法,其特征在于,所述方法包括如下步骤:
S1、将水油通用的分散助剂加入到水溶性有机溶剂中,搅拌均匀;
S2、往S1步骤混合均匀的介质中加入锌粉,搅拌均匀;
S3、往S2步骤混合均匀的介质中加入去离子水,含钼化合物,六氟锑酸银并搅拌均匀,制得钝化好的水性锌浆。
2.根据权利要求1所述的锌粉的无铬钝化方法,其特征在于,步骤S1中,所述水溶性有机溶剂为与去离子水无限混溶的醇类、醚类、酮类中的一种或几种的混合物;所述水溶性有机溶剂的质量为锌粉质量的0.5-2倍。
3.根据权利要求1所述的锌粉的无铬钝化方法,其特征在于,水油通用的分散助剂为既能溶解于所述水溶性有机溶剂,又能溶于水的分散助剂。
4.根据权利要求3所述的锌粉的无铬钝化方法,其特征在于,所述分散助剂为水油两用分散剂,包括湛新公司的ADDITOL VXW 6208、BYK2012;所述水油两用分散剂用量为锌粉质量的3-10%。
5.根据权利要求3所述的锌粉的无铬钝化方法,其特征在于,所述分散助剂为水油均可溶的硅烷偶联剂,包括γ-缩水甘油醚氧丙基三甲氧基硅烷、γ-缩水甘油醚氧丙基三乙氧基硅烷、γ-氨丙基三乙氧基硅烷;所述硅烷偶联剂用量为锌粉质量的5-50%。
6.根据权利要求1所述的锌粉的无铬钝化方法,其特征在于,步骤S2中,所述锌粉为球状锌粉或片状锌粉。
7.根据权利要求1所述的锌粉的无铬钝化方法,其特征在于,所述锌粉的粒径D50为0.1-200um。
8.根据权利要求1所述的锌粉的无铬钝化方法,其特征在于,所述含钼化合物为钼酸盐、钼酸、磷钼酸、三氧化钼中的一种或几种组合。
9.根据权利要求1所述的锌粉的无铬钝化方法,其特征在于,所述含钼化合物添加量为水性锌浆总质量的0.5-7%。
10.根据权利要求1所述的锌粉的无铬钝化方法,其特征在于,六氟锑酸银为白色至淡黄色结晶粉末;六氟锑酸银用量为锌粉质量的0.1-2%。
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