CN101302366B - Metal powder coating, preparation thereof and coating metallic plate - Google Patents
Metal powder coating, preparation thereof and coating metallic plate Download PDFInfo
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- CN101302366B CN101302366B CN 200710093811 CN200710093811A CN101302366B CN 101302366 B CN101302366 B CN 101302366B CN 200710093811 CN200710093811 CN 200710093811 CN 200710093811 A CN200710093811 A CN 200710093811A CN 101302366 B CN101302366 B CN 101302366B
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Abstract
The invention provides a routine and superfine metal powder coating, a method for preparing the same and an application in a metal plate. A metal powder body is spherical; the grain diameter is 10 to 50 mu m; the optimal grain diameter is 10 to 25mu m; the preparation method comprises the following steps that: organic solvent is adopted to dissolve coating resin, then pigment and filler are added, dispersed at a high speed or dispersed by a sand mill; metal pigment is added and mixed; and the viscosity is adjusted for pressurizing, spraying and drying, thereby obtaining a metal powder coating powder body of the metal pigment evenly coated with the resin. The metal powder coating prepared by the invention is widely applied to buildings, home appliances, furniture, automobiles and other industries. The metal powder coating, the method and the application effectively solve the problems that: the prior art is difficult to produce the metal powder coating with even electricity; a product coating is uneven and the thickness of the product coating is too high; and the manufacturing method has complex manufacturing process, difficult implementation, high cost, etc.
Description
Technical field
The present invention relates to a kind of metal powder coating, and preparation method thereof and in the application of coated metallic plate.
Background technology
Powder coating is a kind of powdery substance that is comprised of resin, pigment, filler and additive etc., and wherein the resin Composition as main film forming substance can be a kind of resin and cure system thereof, can be also several resin compounds.
Powder coating mainly is divided into thermoplastic powder coating and thermosetting powder coating(s) by its film-forming resin character.The former is physical property fusion plastification film process, and the latter is chemical cross linking reaction and solidification process.
Thermoplastic powder coating by thermoplastic resin, pigment, filler, softening agent and stablizer etc. through being dry mixed or melting mixing, pulverizing, crossing screen sizing and obtain.
Thermosetting powder coating(s) is comprised of thermosetting resin, solidifying agent, pigment and auxiliary agent etc., through pre-mixing, melt extrude, pulverize, cross screen sizing and the powder type coating preparation that obtains.Molecular resin amount in thermosetting powder coating(s) is little, and itself does not have film forming properties, only under baking condition, is cross-linked into three dimensional structure with the solidifying agent react with, just can be filmed.
Thereby metal powder coating refers to contain metallic pigment makes paint sheet have the various powder coating of metal or nacreous lustre.The metallic pigment that can be used in powder coating have many kinds, as: aluminium silver powder pigment, pearly pigment, copper gold pigment and other metallic pigment (as nickel powder, Stainless Steel Powder etc.).Each metalloid pigment comprises again the product of a lot of form and aspect, after being applied to powder coating, makes powder coating colourful, has greatly enriched the kind of powder coating and ornamental.
The metal effect powder coating, in whole decorative powder, application surface is more and more wider, is the main flow of present fine arts type powder.Because metal powder coating can be showed a kind of bright, luxurious decorative effect, be fit to very much the spraying of the indoor outer objects such as furniture, ornaments and automobile.The metal effect powder coating is mainly used in indoor outer art metal furniture, light fixture, artwork, lampblack absorber, perambulator, sports equipment and automobile and other industries now.
Powder coating starts from the later stage thirties 20th century.People are coated to polyethylene powders on the metallic surface with molten state with flame spraying, the beginning of Here it is powder coating.
After entering the nineties in 20th century, along with decorative powder comes out, powder coating is developed greatly.Powder coating market, world every year, the speed with 15%～20% increased progressively fast.
The manufacturing process of metal powder coating, dry mix (Dry～Blending), also use in the world bonding fixation method (Bonding) is mainly adopted in the domestic and international market at present.
After liquid coating adds metallic pigment such as aluminium powder, can obtain metal effect very obvious coating, and powder coating has certain difficulty when preparing metallic coating.If just add in coating compound aluminium powder before forcing machine melt extrudes, in the machinery of back shatters process, aluminium powder can be at first destroyed, not only can not get glittering metallic coating, and inevitably can occur because of the collision of metal spark cause the burning and the blast.Present modal method is after powder coating is made, and adds metal powder to be dry mixed before using.The method that is dry mixed is more general, but due to the electroconductibility of metal, and the workpiece that is sprayed can not a lot of metal-powder of absorption, makes metal effect strong not, and very inhomogeneous; Simultaneously, the content and the original powder that reclaim the flour gold genus differ greatly, and cause serious aberration.Therefore in actual applications, obtain good metal effect, mainly rely on the application of liquid metal paint.But due to the 4E characteristic that powder coating has, increasing liquid coating forward powder coating changes.
A kind of Bonding technology is arranged recently just in wide popularization and application, this be make powder in an equipment of accurately controlling temperature skin under heating and melting with adhering metal particle method together, the method has been improved the shortcoming that above-mentioned coating metal effect is bad and the recovery powder can't normally use to a great extent, but do not deal with problems fully, and the Bonding technology can't be used for the ultrafine powder product, in addition, existing Bonding equipment price is very high, can't popularize in a large number use.
Reinforcement along with global environmental protection consciousness; powder coating has economy, efficient, environmental protection and province can (often claim 4E:Economical; Efficient; Environmental; Energy Saving) etc. advantage and obtain develop rapidly, replaced liquid coating to use in a lot of fields fully.Be widely used in fields such as metal protection, decoration, buildings, present very fine prospect.Powder coating just progressively becomes a mainstay in coating industry.
But also there are some restrictions now in the application of powder coating, mainly be, can not obtain liquid coating smooth coatingsurface like that, can not obtain liquid coating thinner coat-thickness like that, this has limited the use of powder coating on a lot of expensive goods, has also limited the further reduction of painting cost.Simultaneously, metal powder coating is also the technical problem that needs to continue research of powder coating.
Coating thickness is an important factor that determines the powder coating outward appearance, the thicker flow levelling preferably of having filmed.Yet many products not necessarily need thick coating, and the blocked up waste that causes on the contrary of filming raises the cost, and therefore, the powder coating filming becomes again the focus of research and development in recent years, to satisfy, the higher workpiece of ornamental thickness requirement are used.
Surface irregularity and coating are too thick is all that particle diameter due to powder coating causes too greatly.The particle diameter of conventional powder coating is generally 30～50 μ m, and the thickness of sprayed coating is 60～80 μ m, because particle diameter is large, if thickness below 50 μ m, coating will uneven thickness, tangerine peel is serious, the show-through phenomenon of part occurs.And if the particle diameter of conventional powder coating 30～50 μ m is reduced, namely produce the ultrafine powder paint of particle diameter below 25 μ m, just can overcome the too thick shortcoming of surface irregularity and coating.For this reason, the fine powder of powder coating has changed into a popular research topic of attracting attention very much, has attracted various countries scientific and technical personnel's very big interest.
Superfine powder itself is little due to quality, surface-area is large, and interparticle intermolecular forces increases relatively, is easy to occur that powder is united, the phenomenon of flow difficulties, thereby can't carry out conventional electrostatic spraying.Realize fine-powdered, mainly will solve exactly the fluidisation problem of ultrafine powder.A large amount of work launches around the fluidisation problem, has also obtained sizable progress.
Nishida etc. have invented the method (USP5498479 that adds lubricant; USP5567521), the method makes less than additives such as the aluminum oxide of 1 μ m, titanium dioxide, is adsorbed on powder surface through high-speed mixing, thereby makes powder have mobility preferably.The method has obtained the product with better flowing property of particle diameter at 7～15 μ m, but the additive addition is too many, brings negative interaction in many-sides such as gloss, levelling and performances, more difficultly realizes industrialization.
The human hairs such as Lucarelli understand the method (USP6228927) of adding fluidisation promotor (fluidization enhancer), the method adds the fluidizing performance that can improve powder coating after 0.1～2.0% fluidisation promotor, but can't obtain desirable surface effect, the effort that makes people steps again to real industrialization and goes a step further.
The whole bag of tricks of existing interpolation surface lubricant and fluidisation promotor, although solving in various degree the fluidisation problem, but due to the relatively large use of additive, usually bring the various defectives such as the powder coating flow leveling is bad, delustring is serious, limited to some extent its application.Simultaneously, existing ultrafine powder paint manufacture method production technique is more complicated, performance difficulty, and cost is higher, has the problems such as side reaction and environmental protection.
Fluorocarbon powder paint is the powder coating that grows up the nearly more than ten years, it is a kind of very senior metal building overlay coating, because it has multiple premium properties, outshine othersOne branch of the tree is particularly thriving in the coatings industry development, particularly chemical resistant properties, thermotolerance and weathering resistance are better than other coating varieties greatly, and very large market application foreground is arranged.But different with other coating varieties, the fluorocarbon coating that uses on market now is all almost liquid coating.The powder fluorocarbon coating causes coat-thickness too high because technology of preparing is immature, and cost is apparently higher than liquid coating.Fluorocarbon powder paint mainly contains two large classes, and a class is the thermoplastic fluoroelastomer Fluoropolymer Powder Coatings take resins such as PVDF (vinylidene), ETFE (Ethylene/tetrafluoroethylene), ECTFE (ethene one chlorotrifluoroethylene) as base-material; Another kind of is that development in recent years is very rapid with the thermosetting fluorocarbon powder coatings of trifluorochloroethylene/tetrafluoroethylene and vinyl ether or vinyl ester monomer copolymerization.
The industrial process of powder fluorocarbon coating is to carry out machinery after the employing cooled with liquid nitrogen to shatter now, and obtaining particle diameter is the above powders of 40 μ m.Doctor Lin Xiuqing (Lin, Shiow-Ching) (USP20030060558; 200302102166) polymkeric substance of having invented PVDF and acrylic acid copolymer prepares fluorocarbon powder paint, and its preparation process is by filtering or emulsion directly carries out spraying drying and prepares fluorocarbon powder paint.But do not mention the preparation ultrafine powder paint, do not add fluidisation promotor to carry out flowing property to ultrafine powder paint yet and improve, do not obtain the coating that coat-thickness is 20～35 μ m yet.In addition, the research of metal-powder fluorocarbon coating and preparation there is not yet any report.
The present invention finds when studying existing powder coating powder, and most powders present irregular bulk and sheet, and irregular sheet, powder is just more easily united.Through experimental study, the discovery powder is got over the subglobular structure, more is not easy to unite.This is that the Surface Contact between powder is also minimum because the surface-area of spheroid powder is minimum.And powder utilization is better.
In sum, metal powder coating is starved of the following problem that solves:
(1) improve the mobility of metal powder coating with preparation submicron metal coating;
(2) find a kind of novel method for preparing high-content metal powder powder coating, very good to obtain metal effect, reclaim the product innovation that powder can take full advantage of;
(3) a kind of low temperature of can avoiding of invention shatters to prepare the metal fluorocarbon coatings novel method of (comprising the superfine metal fluorocarbon coating).
For this reason, the invention provides a kind of novel method for preparing metal powder coating, prepare metal powder coating with the method and have the following advantages:
(1) metallic pigment are wrapped up well by resin, thereby have uniform chargeding performance, and make not re-using of powder of recovery can produce aberration;
(2) coating material production is convenient, and color easily repeats;
(3) mode of production is fit to the metal powder coating of the various particle diameters of preparation, comprises submicron metal coating, and the submicron metal coating that obtains is because its powder particle presents ball shape, thereby has good fluidizing performance.
(4) in addition, the method is applicable to the various metal powder coatings of manufacture, particularly is fit to preparation metal fluorocarbon powder coating, thereby the preparation method who greatly simplifies fluorocarbon powder paint also successfully realizes the preparation of ultra-fine fluorocarbon powder paint.
Summary of the invention
First purpose of the present invention is to provide a kind of routine and submicron metal coating.
Second purpose of the present invention is to provide the preparation method of this metal powder coating.
The 3rd purpose of the present invention is to provide a kind of coated metallic plate.
The present invention is difficult to produce charged uniform metal powder coating in order to solve prior art, and product coating unfairness and thickness is too high, the manufacture method production technique is more complicated, performance difficulty, the problem such as cost is higher.
The object of the present invention is achieved like this:
Adopt organic solvent that coating resin is dissolved, then add pigment and filler, after high speed dispersion or sand mill dispersion, add metallic pigment to mix, adjusting viscosity carries out the pressurized spray drying, and the powder metallic pigment that obtain are evenly wrapped up by resin, and the well-regulated ball shape of powder tool, even ultrafine powder in the situation that do not add or add the fluidisation promotor of seldom measuring to sieve, obtains having the submicron metal coating of fine flowing property.
Metal powder coating of the present invention, moiety comprises that mass percent is resin: pigment: filler: metallic pigment: additive=50.0～90.0%:0.1～25.0%:0.1～20.0%:0.5～15.0%:0.05～5.0%, wherein said metal powder coating powder is spherical in shape, particle diameter is 10～50 μ m, and preferred particle diameter is 10～25 μ m.
The median size of product of the present invention is 10～50 μ m, the metal powder coating that comprises the superfine powder of 10～25 μ m, it is thin a lot of that particle diameter 30～50 μ m of the conventional powder coating of particle diameter ratio want, its powder particle shape spherical in shape, thus superfine powder has powder fluidization performance preferably.
Metal powder coating of the present invention, wherein said resin are selected from the wherein a kind of of vibrin, urethane resin, epoxy resin, polyester epoxy mixture, acrylic resin, acrylic resin fluorocarbon resin composition.
Metal powder coating of the present invention, wherein said acrylic resin fluorocarbon resin composition proportioning is 50/50～10/90, wherein preferred proportioning is 70/30.
Metal powder coating of the present invention, wherein said metallic pigment comprise that coating that various coating processed with aluminium powders, aluminium paste, various pearlescence, with resin parcel or part parcel is with aluminium powder or aluminium paste.
The preparation method of metal powder coating of the present invention, wherein said preparation method comprises following step:
(1). first with resin dissolves in organic solvent, then add pigment and filler, stir;
(2). grind through high speed dispersion or sand mill, obtain the uniform liquid intermediate of pigment and fillers dispersed;
(3). add the metallic pigment (as aluminium-silver slurry or pearlescence etc.) of needs, stir;
(4). finely dispersed liquid is carried out the pressurized spray drying and granulating, obtain the spherical powder of 10～50 μ m;
(5). to superfine powder, add a small amount of fluidisation promotor as additive, after high-speed stirring, screening obtains submicron metal coating.
Passed through the efficient dispersion processes such as liquid sand milling before powder of the present invention is granulated in organic solvent, made pigment and filler to be dispersed in better in resin, thereby the coating that obtains has very outstanding opacifying power.
The organic solvent that the present invention uses is the organic solvent of routine ether solvent as pure in butanone, toluene, dimethylbenzene and part, according to the difference of coatings chemistry performance, different choice can be arranged.
The preparation method of metal powder coating of the present invention, wherein said raw material is resin by mass percentage: pigment: filler: metallic pigment: additive=50.0～90.0%:0.1～25.0%:0.1～20.0%:0.5～15.0%:0.05～5.0%.
The preparation method of metal powder coating of the present invention, wherein said metallic pigment comprise that coating that various coating processed with aluminium powders, aluminium paste, various pearlescence, with resin parcel or part parcel is with aluminium powder or aluminium paste.
The preparation method of metal powder coating of the present invention, wherein said resin is selected from the wherein a kind of of vibrin, urethane resin, epoxy resin, polyester epoxy mixture, acrylic resin, acrylic resin fluorocarbon resin composition.
The preparation method of metal powder coating of the present invention, wherein said acrylic resin fluorocarbon resin composition proportioning is 50/50～10/90, wherein preferred proportioning is 70/30.
The preparation method of metal powder coating of the present invention, wherein said pressurized spray drying and granulating processing condition are: the solids content of liquid is 20%～70%; Inlet air temperature is 70～170 ℃; The spraying stream pressure is 0.1～1.0 normal atmosphere; The pressure of pressurization arosol spray drying and granulating is 0.1～3.0 normal atmosphere; Entering hot air temperature is 70～180 ℃.
Usually add the mobility that fumed silica can improve powder coating, a small amount of interpolation can to a certain degree improve the mobility of the above powder of 25 μ m, must add larger quantity to thinner powder, though improved powder fluidity but exist, caused the serious tangerine peel of coatingsurface, the vaporific problem of delustring and surface.
The preparation method of metal powder coating of the present invention, wherein said fluidisation promotor as additive is the fumed silica of 0.1～1.0% resin quality.
The superfine powder of granulating and preparing through pressurized spray in the present invention adds a small amount of fumed silica and processes, and can reach mobility fine, and coatingsurface is very smooth, the effect that coat-thickness reduces.
The particle diameter of powder grain detects: adopt laser granulometry to measure.
Coated metallic plate of the present invention is to adopt submicron metal coating preparation of the present invention, and metal-powder coating is 20～40 μ m, has very even curface and metal effect uniformly.
Coated metallic plate of the present invention, wherein said coated metallic plate comprise metal-powder PVDF fluororine-carbon coating metal sheet.
Fluorocarbon powder paint is the same with other powder coating has environmental protection, an economic dispatch advantage, but due to the restriction of technology, and fluorocarbon powder paint exists also that cost is too high, surface finish is poor and the shortcoming such as production process is loaded down with trivial details.And research and the preparation of metal-powder fluorocarbon coating there is not yet report.On market, fluorocarbon coating almost all remains liquid coating now.The present invention adopts liquid dispersed pigment and liquid spray method to prepare the good spherical powder of fluidizing performance, can successfully obtain the submicron metal fluorocarbon coating, thereby obtains the novel process product innovation applicatory that cost is low, performance good, production is easy.The present invention is applicable to the preparation of various metal-powder fluorocarbon coatings.
The simple declaration of accompanying drawing
Fig. 1 is arosol spray moisture eliminator equipment schematic diagram of the present invention.
The 1-spray-drying tower, 2-pressurized air, 3-feed liquid, 4-warm air, 5-nozzle, 6-cyclonic separator, 7-induced draft fan, 8-washing-condensing tower, 9-water cooler, 10-recycle pump, 11-gas blower, 12-warm air burner.
Embodiment
With reference to accompanying drawing, in conjunction with the embodiments, the invention will be further described, but the present invention is not limited to these embodiment.Any change that those skilled in the art do under the enlightenment of disclosure of the present invention also all drops in the scope of claim protection of the present invention.
As shown in drawings, can know the enforcement of understanding the inventive method in relevant device.
Embodiment 1
Add in a mixing bowl of 30 liters the 15.0kg mixed organic solvents (butanone: toluene: ethanol=70:25.5), then under agitation add following material:
Vibrin 6.0kg DSM N. V. 5900
Solidifying agent TGIC 0.5kg VanticoT810
The South Sea, st-yrax 0.04kg Ningbo chemistry company limited
Iron oxide black pigment 0.2kg BASF
Flow agent 0.1kg Worlee PV88
High speed dispersion is more than 30 minutes, detects fineness, and fineness reaches 50 μ m when following, stops dispersion.Add the coated aluminium-silver slurry (80% solid content) of 1.0kg, slowly stirred 30 minutes.Aforesaid liquid is carried out aerosol atomizing granulation, and the heating temperature of inlet air is 110 ℃, and air outlet temperature is 50 ℃, and spray pressure is 0.5, adjusts the atomizing effect of nozzle, makes the powder balling-up shape that obtains, and median size is 20 μ m.Product has good flow leveling, is sprayed on through on the pretreated aluminium sheet of chromaking with electrostatic spraying ground mode, and baking is 15 minutes at the temperature of 190 ℃.The paint sheet coat-thickness that obtains is 40 μ m, and coatingsurface is very smooth and desirable metal effect arranged.
Embodiment 2
As example 1, but adjustable spraying air pressure is 0.3, and regulates the atomizing effect of nozzle, and making the diameter of particle that obtains is 35 μ m.The coating film thickness that obtains is 80 μ m, and coatingsurface has metal effect, but has the distinctive larger tangerine line of ordinary powder coating.
As example 1, but adjustable spraying air pressure is 0.6, and regulates the atomizing effect of nozzle, and making the diameter of particle that obtains is 10 μ m.Add 1.0% fumed silica to mix, the coating film thickness that obtains is 25 μ m, and coatingsurface is very smooth, and opacifying power is good, has the metallic surface effect.
Embodiment 4
As example 1, but adjustable spraying air pressure is 0.5, and regulates the atomizing effect of nozzle, and making the diameter of particle that obtains is 18 μ m.Add 0.1% vapor phase process aluminum oxide to mix, coatingsurface is very smooth, and opacifying power is good, has the metallic surface effect.
As example 1, but adjustable spraying air pressure is 0.4, and regulates the atomizing effect of nozzle, and making the diameter of particle that obtains is 25 μ m.Do not add any fluidisation promotor, the coating film thickness that obtains is 35 μ m, and the model of coatingsurface ratio 2 is obviously smooth.
Embodiment 6
Add in a mixing bowl of 30 liters the 10.0kg mixed organic solvents (butanone: toluene: ethanol=70:25:5), then under agitation add following material:
Urethane resin 6.0kg Cyba company 3109
Hexanolactam sealing diethyl cyanate 0.9kg Hues B1530
Iron oxide black pigment company of 0.1kg Cathay
Flow agent 0.2kg Worlee PV88
Processing mode such as example 1.But cross sand mill after high-speed stirring, grind and make fineness reach 50 μ m when following, stop dispersion.The pearlescence that adds 0.7kg carries out mist projection granulating after slowly stirring, and the diameter of particle that obtains is 18 μ m, and the coating prod thickness is 35 μ m, has good metal watch effect, extraordinary planeness.
Add in a mixing bowl of 30 liters the 14.0kg mixed organic solvents (butanone: toluene: ethanol=70:25:5), then under agitation add following material:
Acrylic resin 5.3kg BASF AG
SA 0.4kg Shanghai Raw Materials Company of Chemical Industry
The titanium dioxide 0.2kg R of E.I.Du Pont Company～960
Pigment company of chrome green 1.0kg Cathay
Flow agent 0.15kg Worlee PV88
Processing mode such as example 3 add the coated aluminium powder (Canbro company product) of 0.7kg.The diameter of particle that obtains is 18 μ m, and the coating prod thickness is 32 μ m, has green metal look and the extraordinary planeness of light.
Add in a mixing bowl of 30 liters the 12.0kg mixed organic solvents (butanone: toluene=80:20), then under agitation add following material:
The vinylformic acid 7.0kg Rohm Haas B44 of company
The PVDF fluorocarbon resin 3.0kg AtoFina Kynar711 of company
Flow agent 0.285kg Worlee PV88
UV light absorber 0.015kg Cyba1010
Processing mode is with example 1, but adds high weather-proof pearly pigment 1.0kg (139X, Engherd product), and the model after electrostatic spraying was 240 ℃ of bakings 10 minutes.The diameter of particle that obtains is 19 μ m, and the coating prod thickness is 40 μ m, and coating has good pearly-lustre color and luster and extraordinary planeness.
Formula and preparation method such as example 8, but adjustable spraying air pressure is 0.6, and regulate the atomizing effect of nozzle, making the diameter of particle that obtains is 10 μ m.Add 1.0% vapor phase process aluminum oxide to mix, the coating film thickness that obtains is 30 μ m, and coatingsurface is smooth.
Formula and preparation method such as example 8, but adjustable spraying air pressure is 0.5, and regulate the atomizing effect of nozzle, making the diameter of particle that obtains is 15 μ m.Add 0.1% fumed silica to mix, the coating film thickness that obtains is 32 μ m, and coatingsurface is very smooth.
The ratio of fluorocarbon resin and acrylic resin and kind affect not quite the preparation method of product of the present invention, and different raw materials forms only needs suitably to regulate the solid spherical powder that working condition can obtain having the good flow performance.Usually, PVDF/ vinylformic acid ratio is 50/50～10/90, but is preferably 70/30.Vinylformic acid can be thermoplastic can be also heat cured.Fluorocarbon coating must be inorganic or beramic color with pigment.
Compared with prior art, the present invention has following advantage:
Method with liquid spray-drying process prepares the metal powder coating that metallic pigment are wrapped up by resin, avoided the mechanical destruction that shatters metallic pigment, the preparation method of the metal powder coating that this is new, not only the metal powder coating with uniform charged performance can be prepared easily, and the ultrafine powder paint with good flow performance can be prepared.And the method that normally used machinery shatters can only obtain the thicker powder of particle diameter, obtain superfine powder, needs more complicated equipment.
The well-regulated ball shape of powder tool that the present invention obtains, the surface-area that greatly reduces and the surface factor such as energy make powder of the present invention have the less powder ability of uniting, thereby have good fluidizing performance.Like this, do not add or add a small amount of fluidisation promotor as additive just can obtain the submicron metal coating products.And the high efficiency of liquid grinding distribution makes coating have very superior opacifying power.
Being noted that in addition the ultrafine powder paint of 10～25 μ m particle diameters, is the particle size range that needs most now.Powder coating less than 10 μ m has the shortcomings such as powder utilization is low, and actual production there is no need.Be limited to the above ultrafine powder of 10 μ m although the present invention will improve the scope of mobility, in fact substantially can satisfy the requirement that most particle diameters are used.The present invention can prepare applicable ultrafine powder, greatly improves the coatingsurface planeness, also the thickness that has ordinary powder coating now can be reduced simultaneously approximately half.The method is applicable to all coating varieties, compares with other existing ultrafine powder manufacture method, has to implement easily, and the series of advantages such as be free from side effects has very large market application foreground.Preparation ultrafine metal powders product has the effect that the method for additive method such as Bonding can't obtain.
The above-mentioned various advantages of the present invention are meaningful especially to the preparation of powder fluorocarbon coating especially metal-powder fluorocarbon coating.Adopt method of the present invention need not re-use the method that expensive loaded down with trivial details liquid nitrogen freezing shatters, and found the novel method that successfully prepares ultrafine metal powders end fluorocarbon coating, this submicron metal fluorocarbon coating can obtain the fluororine-carbon coating that planeness is good, coating is thin, opacifying power is good, thereby makes the powder fluorocarbon coating be significantly less than on the contrary liquid fluorocarbon coating on cost.The industrial application of this invention will change powder fluorocarbon coating usage quantity little now, bring very large environmental protection and social benefit.
Claims (8)
1. metal powder coating, moiety comprises that weight percent is resin: pigment: filler: metallic pigment: additive=50.0～90.0%:0.1～25.0%:0.1～20.0%:0.5～15.0%:0.05～5.0%, it is characterized in that, described metal powder coating powder is similar spherical, particle diameter is 10～50 μ m
The described metallic pigment coating that to be various coating processed with aluminium powders, aluminium paste, various pearlescence, with resin parcel or part parcel is with aluminium powder or aluminium paste,
The preparation method of described metal powder coating comprises following step:
(1). first with resin dissolves in organic solvent, then add pigment and filler, stir;
(2). grind through high speed dispersion or sand mill, obtain the uniform liquid intermediate of pigment and fillers dispersed;
(3). add the metallic pigment of needs, stir;
(4). finely dispersed liquid is carried out the pressurized spray drying and granulating, obtain the spherical powder of 10～50 μ m;
(5). to superfine powder, add a small amount of fluidisation promotor as additive, after high-speed stirring, screening obtains submicron metal coating.
2. metal powder coating as claimed in claim 1, is characterized in that, described metal powder coating powder is similar spherical, and particle diameter is 10～25 μ m.
3. metal powder coating as claimed in claim 1, is characterized in that, described resin is selected from the wherein a kind of of vibrin, urethane resin, epoxy resin, polyester epoxy hybrid resin, acrylic resin, vinylformic acid fluorocarbon resin composition.
4. the preparation method of a kind as the described metal powder coating of above-mentioned any one claim, the moiety of described metal powder coating comprises that weight percent is resin: pigment: filler: metallic pigment: additive=50.0～90.0%:0.1～25.0%:0.1～20.0%:0.5～15.0%:0.05～5.0%, described metal powder coating powder is similar spherical, particle diameter is 10～50 μ m
The described metallic pigment coating that to be various coating processed with aluminium powders, aluminium paste, various pearlescence, with resin parcel or part parcel is with aluminium powder or aluminium paste,
The preparation method of described metal powder coating comprises following step:
(1). first with resin dissolves in organic solvent, then add pigment and filler, stir;
(2). grind through high speed dispersion or sand mill, obtain the uniform liquid intermediate of pigment and fillers dispersed;
(3). add the metallic pigment of needs, stir;
(4). finely dispersed liquid is carried out the pressurized spray drying and granulating, obtain the spherical powder of 10～50 μ m;
(5). to superfine powder, add a small amount of fluidisation promotor as additive, after high-speed stirring, screening obtains submicron metal coating.
5. the preparation method of metal powder coating as claimed in claim 4, is characterized in that, described pressurized spray drying and granulating processing condition are:
The solids content of liquid is 20%～70%;
Inlet air temperature is 70～170 ℃;
The spraying stream pressure is 0.1～1.0 normal atmosphere.
6. the preparation method of metal powder coating as claimed in claim 4, is characterized in that, described fluidisation promotor as additive is the fumed silica of 0.1～1.0% resin quality.
7. a coated metallic plate, is characterized in that, described coated metallic plate is any one described metal powder coating preparation of adopting claim 1-3, and described metal-powder coating thickness is 20～40 μ m.
8. coated metallic plate as claimed in claim 7, is characterized in that, described coated metallic plate comprises metal-powder PVDF fluororine-carbon coating metal sheet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710093811 CN101302366B (en) | 2007-05-11 | 2007-05-11 | Metal powder coating, preparation thereof and coating metallic plate |
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| CN 200710093811 CN101302366B (en) | 2007-05-11 | 2007-05-11 | Metal powder coating, preparation thereof and coating metallic plate |
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| CN101302366A CN101302366A (en) | 2008-11-12 |
| CN101302366B true CN101302366B (en) | 2013-06-19 |
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| CN 200710093811 Expired - Fee Related CN101302366B (en) | 2007-05-11 | 2007-05-11 | Metal powder coating, preparation thereof and coating metallic plate |
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