CN101613559A - Hydrophilic nano zinc based composite coating - Google Patents
Hydrophilic nano zinc based composite coating Download PDFInfo
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- CN101613559A CN101613559A CN200810058585A CN200810058585A CN101613559A CN 101613559 A CN101613559 A CN 101613559A CN 200810058585 A CN200810058585 A CN 200810058585A CN 200810058585 A CN200810058585 A CN 200810058585A CN 101613559 A CN101613559 A CN 101613559A
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Abstract
The invention belongs to the chemical technical field of coatings, what be specifically related to is a kind of hydrophilic nano zinc based composite coating that is used for the metallic element surface anticorrosive.Coating contains emulsifying agent, dispersion agent and defoamer, key be also contain scaled metal powder, nano-oxide, silane coupling agent, alcoholic solvent, macromolecule organic, thickening material and with 30.0%~60.0% water as dispersion medium.Coating can apply by spraying, brushing, dip-coating, dipping-methods such as centrifugal coating, baking formed coating in about 20 minutes through about 200 ℃, anti-neutral salt spray corrosion test reaches more than the 800h, bonding force reaches (tape test) more than 4 grades, have the environmental pollution of not producing, anticorrosive metal excellent property, advantage economical and practical, easy to use, the anti-corrosive treatment of metallic element that can be widely used in the anti-corrosive treatment, particularly complex geometry on metallic element surfaces such as iron, aluminium, copper, magnesium alloy.
Description
One, technical field
The invention belongs to the chemical technical field of coatings, what be specifically related to is a kind of hydrophilic nano zinc based protection against corrosion composite coating that is used for the metallic element surface.
Two, background technology
It is a kind of extremely general spontaneous phenomenon that metal is corroded, and spreads all over the every field of the development of the national economy, is engulfing Nonrenewable resources a large amount of on the earth constantly, and according to incompletely statistics, the financial loss that whole world every year causes because of metallic corrosion is up to the many trillion dollar.Therefore, people are being devoted to the research of anticorrosive metal by persistence, numerous anti-corrosion method for metal has been proposed, produced numerous products that prevents metallic corrosion, these methods and product are to prevent that metallic corrosion from having made very positive contribution, but, all fail to solve simultaneously well its weather resisteant that prevents metallic corrosion, adherence problem and reach easy to use, efficient, energy-conservation and environmental protection requirement simultaneously with regard to single method or product.Electroplate, hot dip, electroless platings etc. prevent the metallic element corroding method, direct or indirect contaminate environment phenomenon will appear when the pre-treatment of metallic surface, conventional coating is difficult to effectively solve weather resisteant and adherence problem, " the high anti-corrosion water-insoluble zinc-base nano anticorrosive coating " of invention recently, with lipid, organism such as alcohols are dispersion medium, belong to the solvent-borne type nano anticorrosive coating, used the chromic acid compounds in " Zinc base water soluble anti-corrosion paint for metal surface ", " WL water dispersible zinc chromate corrosion-proof paint " also used the chromic acid compounds, and so on, these inventions all can pollute environment owing to organic solvent volatilization or sexavalent chrome unavoidably; The antiseptic property of applying nano technological improvement coating not in " non-electrolytic metal corrosion preventing paint " and for example, but adopt molybdate and tungstate to strengthen the Corrosion Protection of coating.
Three, summary of the invention
Purpose of the present invention just is to overcome the defective that the above-mentioned background technology exists, and for society provides a kind of existing weather resisteant strong, adherence is good, do not produce environmental pollution, the anticorrosive metal excellent property has economical and practical again, easy to use, the hydrophilic nano zinc based composite coating of characteristics such as have wide range of applications.
The present invention seeks to be achieved through the following technical solutions:
Hydrophilic nano zinc based composite coating contains emulsifying agent, dispersion agent and defoamer, and key is also to contain scaled metal powder, nano-oxide, silane coupling agent, alcoholic solvent, macromolecule organic, thickening material and water.
Scaled metal powder is as matrix, and performance sacrificial anode characteristic functions is preferably flake zinc powder and flakey aluminium powder, and its diameter is preferably about 20 μ m~30 μ m, and thickness is preferably 2 μ m~3 μ m.
Nano-oxide is used to improve adhesive force of coatings, corrosion strength, outward appearance and reduces solidification value, is preferably nano silicon or nano titanium oxide.
Alcoholic solvent is preferably glycol ether or ethylene glycol or polyoxyethylene glycol or glycol ether or diethylene glycol ethyl ether or dipropylene glycol in order to improve the antiseptic property of composite coating.
Silane coupling agent is in order to improve coating property and stability thereof; it is a kind of organofunctional silane; its organic functional base can be vinyl and methacryloyl; but be preferably epoxide functional groups and ammonia functional group; be good with β-(3, the 4-epoxycyclohexyl) ethyl trimethoxy silane or γ-glycidoxypropyltrimewasxysilane or γ-An Jibingjisanyiyangjiguiwan especially.
Macromolecule organic has the anticorrosive metal performance, can be water-borne acrylic resin or aqueous epoxy resins or waterborne polyurethane resin or aqueous phenolic aldehyde resin or waterborne organic silicon resin or water-based organic fluorine, be preferably aqueous epoxy resins or waterborne polyurethane resin or aqueous silicon resin.
Thickening material is preferably Walocel MT 20.000PV or Natvosol or hydroxypropylcellulose or xanthan gum.
Also include emulsifying agent, dispersion agent and defoamer in the technical solution of the present invention, they all be in the coating material production the auxiliary agent that must use, belong to the routine techniques model and raise, and the selected emulsifying agent of the present invention is preferably polyoxyethylene nonylphenol ether series and sorbitan fatty acid ester Soxylat A 25-7 (tween series); Dispersion agent is preferably the water-based wetting dispersing agent; Defoamer is preferably the waterborne organic silicon defoamer.
The parts by weight of each component of hydrophilic nano zinc based composite coating are: flake zinc powder 10.5%~20.0%, flakey metallic aluminium powder 4.0%~8.0%, nano-oxide 0.4%~2.0%, alcoholic solvent 10%~14%, silane coupling agent 5%~15%, macromolecule organic 4.0%~10.0%, thickening material 0.1%~1.0%, water 30.0%~60.0%.
Emulsifying agent, dispersion agent and froth breaking use total amount to be no more than 5% in all technical schemes of the present invention.
Hydrophilic nano zinc based composite coating of the present invention at first is to make the A component with scaled metal powder, nano-oxide, macromolecule organic, alcoholic solvent, emulsifying agent, dispersion agent and water, the secondth, make the B component with silane coupling agent and defoamer, the 3rd is to make the C component with thickening material or thickening material and defoamer, the 4th is that A, B two component thorough mixing is even, adds the C component again and mixes packing and get product.In addition, for prolonging the quality guaranteed period of its coating, A, B, three kinds of components of C can be packed respectively, and systems selling is earlier even with A, B two component thorough mixing during use, add the C component again and mix and get final product.
Hydrophilic nano zinc based composite coating of the present invention with 30.0%~60.0% water as dispersion medium, it is a kind of novel aqueous chromium-free metal anti-corrosive paint, it is strong not only to have weather resisteant, adherence is good, do not produce environmental pollution, the advantage of anticorrosive metal excellent property also has economical and practical, advantage easy to use, as to have wide range of applications.Coating can apply by spraying, brushing, dip-coating, dipping-methods such as centrifugal coating, coating is coated on the metallic element surface and formed coating in about 20 minutes through baking about 200 ℃, be widely used in the anti-corrosive treatment on metallic element surfaces such as iron, aluminium, copper, magnesium alloy, its performance is much better than traditional plating or hot-dipping method, particularly when the anti-corrosive treatment of the metallic element that carries out complex geometry, more shown its outstanding advantage.
Four, embodiment
The present invention is described in further detail with specific embodiment below:
Embodiment 1
The parts by weight such as the table 1 of each component of hydrophilic nano zinc based composite coating of the present invention:
Table 1
Make A, B, C component by the listed prescription of table, A, B two components are mixed and stir, add the C component again and mix and stir, the packing hydrophilic nano zinc based composite coating that gets product.For prolonging the coating quality guaranteed period, the present invention also can be with A, B, C component difference packed for standby use.Earlier A, B two components are mixed during use and stir, add the C component again and mix and stir.
After this coating was coated on the metallic element surface, 5min-30min can form hard coat with 100 ℃-150 ℃ bakings of temperature, and the anti-neutral salt spray test time of this coating reaches more than the 480h, and the coating bonding force reaches (tape test) more than 4 grades.
Embodiment 2
The parts by weight such as the table 2 of each component of hydrophilic nano zinc based composite coating of the present invention
Table 2
Make A, B, C component by the listed prescription of table, A, B two components are mixed and stir, add the C component again and mix and stir, the packing hydrophilic nano zinc based composite coating that gets product.For prolonging the coating quality guaranteed period, the present invention also can be with A, B, C component difference packed for standby use.Earlier A, B two components are mixed during use and stir, add the C component again and mix and stir.
After this coating was coated on the metallic element surface, 20min can form hard coat with 120 ℃-200 ℃ bakings of temperature, and the anti-neutral salt spray test time of this coating reaches more than the 800h, and the coating bonding force reaches (tape test) more than 4 grades.
Embodiment 3
The parts by weight such as the table 3 of each component of hydrophilic nano zinc based composite coating of the present invention
Table 3
Listed side makes A, B, C component by table, A, B two components are mixed and stirs, and adds the C component again and mixes and stir, the packing hydrophilic nano zinc based composite coating that gets product.For prolonging the coating quality guaranteed period, the present invention also can be with A, B, C component difference packed for standby use.Earlier A, B two components are mixed during use and stir, add the C component again and mix and stir.
After this coating was coated on the metallic element surface, 10min-20min can form hard coat with 120 ℃-250 ℃ bakings of temperature, and the anti-neutral salt spray test time of this coating reaches more than the 800h, and the coating bonding force reaches (tape test) more than 4 grades.
Technical solution of the present invention (comprising the foregoing description) helps to improve the performance of hydrophilic nano zinc based composite coating simultaneously for making things convenient for the preparation of B component, also can preferably add zinc oxide or boric acid, and its addition is no more than 1% of total prescription.
Claims (8)
1, hydrophilic nano zinc based composite coating is made up of emulsifying agent, dispersion agent and defoamer: it is characterized in that: also contain scaled metal powder, nano-oxide, alcoholic solvent, silane coupling agent, macromolecule organic, thickening material and water in the hydrophilic nano zinc based composite coating.
2, hydrophilic nano zinc based composite coating according to claim 1 is characterized in that: scaled metal powder is preferably flake zinc powder and flakey aluminium powder.
3, hydrophilic nano zinc based composite coating according to claim 2, it is characterized in that: composite coating contains 10.5%~20.0% flake zinc powder, 4.0%~8.0% flakey aluminium powder, 0.4%~2.0% nano-oxide, 10.0%~14.0% alcohol organic solvent, 5.0%~15.0% silane coupling agent, 4.0%~10.0% macromolecule organic, 0.1%~1.0% thickening material, 30.0%~60.0% water.
4, hydrophilic nano zinc based composite coating according to claim 3 is characterized in that: nano-oxide is preferably nano silicon or nano titanium oxide.
5, hydrophilic nano zinc based composite coating according to claim 4 is characterized in that: alcoholic solvent is preferably ethylene glycol or polyoxyethylene glycol or glycol ether or triglycol or diethylene glycol ethyl ether or dipropylene glycol.
6, hydrophilic nano zinc based composite coating according to claim 5 is characterized in that: silane coupling agent is preferably band oxygen functional group or ammonia functional group's silane.
7, hydrophilic nano zinc based composite coating according to claim 6 is characterized in that: macromolecule organic is preferably aqueous epoxy resins or aqueous polyurethane tree agent or aqueous silicon resin.
8, hydrophilic nano zinc based composite coating according to claim 7 is characterized in that: thickening material is preferably Walocel MT 20.000PV or Natvosol or hydroxypropylcellulose or xanthan gum.
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