CN101302366A - 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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- CN101302366A CN101302366A CN 200710093811 CN200710093811A CN101302366A CN 101302366 A CN101302366 A CN 101302366A CN 200710093811 CN200710093811 CN 200710093811 CN 200710093811 A CN200710093811 A CN 200710093811A CN 101302366 A CN101302366 A CN 101302366A
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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 of being made up 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, also can be 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 a physical property fusion plastification film process, and the latter is a chemical cross linking reaction and solidification process.
Thermoplastic powder coating do to be mixed by warps such as thermoplastic resin, pigment, filler, softening agent and stablizers or melting mixing, pulverizing, cross screen sizing and obtain.
Thermosetting powder coating(s) is made up 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 the 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.
Metal powder coating is meant that thereby containing 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 the product of a lot of form and aspect again, be applied to powder coating after, make powder coating colourful, 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 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 bonding fixation method (Bonding) is in the world 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 before forcing machine melt extrudes, just add in the coating compound aluminium powder, in the pure process of the mechanical powder of back, aluminium powder can be at first destroyed, not only can not get glittering metallic coating, and can occur because of the collision of metal inevitably spark cause the burning and the blast.Present modal method is after powder coating is made, and adds metal powder before using and does mixed.It is more general to do the method for mixing, but because the electroconductibility of metal, a lot of metal-powder of the impossible absorption of the workpiece that is sprayed makes metal effect strong inadequately, 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 because 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 in the equipment of an accurate controlled temperature, make powder skin under heating and melting with adhering metal particle method together, this 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 use in a large number.
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 has replaced liquid coating to use in a lot of fields fully.Obtained using widely in fields such as metal protection, decoration, buildings, presented very fine prospect.Powder coating just progressively becomes a mainstay in the 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 the like that thin coat-thickness of liquid coating, 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 also is the technical problem that needs to continue research of powder coating.
Coating thickness is an important factor of decision 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 the focus of research and development again in recent years, to satisfy the higher workpiece of ornamental thickness requirement are used.
Surface irregularity and coating are too thick all to be because the particle diameter of 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 big, 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, promptly 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 easy to take place that powder is united, the phenomenon of flow difficulties because quality is little, surface-area is big, and interparticle intermolecular forces increases relatively, thereby can't carry out conventional electrostatic spraying.Realize fine-powdered, mainly will solve the fluidisation problem of ultrafine powder exactly.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), this 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 good mobility.This 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, difficult realization industrialization.
People such as Lucarelli have invented the method (USP6228927) of interpolation fluidisation promotor (fluidization enhancer), can improve the fluidizing performance of powder coating behind the fluidisation promotor of this method adding 0.1～2.0%, but can't obtain the ideal surface effect, make people's effort step again and go a step further to real industrialization.
The whole bag of tricks of existing interpolation surface lubricant and fluidisation promotor, although solving the fluidisation problem in various degree, but, limited its application to some extent because the relatively large use of additive usually brings various defectives such as the powder coating flow leveling is bad, delustring is serious.Simultaneously, existing ultrafine powder paint manufacture method production technique is complicated, performance difficulty, and cost is higher, has problems such as side reaction and environmental protection.
Fluorine carbon dust coating is the powder coating that grows up the nearly more than ten years, it is a kind of very high-grade metal building overlay coating, because it has multiple premium properties, in the coatings industry development, outshine othersOne branch of the tree is particularly thriving, particularly chemical resistant properties, thermotolerance and weathering resistance are better than other coating varieties greatly, and very big market application foreground is arranged.But different with other coating varieties, the fluorocarbon coating that uses on the market almost all is a liquid coating now.The powder fluorocarbon coating causes coat-thickness too high because technology of preparing is immature, and cost is apparently higher than liquid coating.Fluorine carbon dust coating mainly contains two big classes, and a class is to be the thermoplastic fluoroelastomer carbon dust coating of base-material with PVDF (vinylidene), ETFE (Ethylene/tetrafluoroethylene), ECTFE resins such as (ethene one chlorotrifluoroethylenes); Another kind of is that development in recent years is very rapid with the thermosetting fluoro carbon dust coating of trifluorochloroethylene/tetrafluoroethylene and vinyl ether or vinyl ester monomer copolymerization.
The industrial process of powder fluorocarbon coating is to carry out mechanical powder essence after adopting cooled with liquid nitrogen now, and obtaining particle diameter is the above powders of 40 μ m.Doctor Lin Xiuqing (Lin, Shiow-Ching) (USP20030060558; 200302102166) invented the polymer manufacture fluorine carbon dust coating of PVDF and acrylic acid copolymer, its preparation process is by filtering or emulsion directly carries out spraying drying and prepares fluorine carbon dust coating.But do not mention the preparation ultrafine powder paint, ultrafine powder paint is not added fluidisation promotor yet and carry out the flowing property improvement, do not obtain the coating that coat-thickness is 20～35 μ m yet.In addition, any report is not seen in the research of metal-powder fluorocarbon coating and preparation as yet.
The present invention finds that most powders present irregular bulk and sheet when studying existing powder coating powder, and irregular sheet, and powder is easy uniting more just.Through experimental study, the discovery powder is got over the subglobular structure, is not easy more to unite.This is the surface-area minimum owing to the spheroid powder, and the surface contact between powder is also minimum.And powder utilization is better.
In sum, metal powder coating is starved of the following problem that solves:
(1) improves the flowability 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 make full use of;
(3) a kind of low temperature powder essence of can avoiding of invention prepares the metal fluorocarbon coating 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 this 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 repeats easily;
(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 presents ball shape owing to its powder particle, thereby has good fluidizing performance.
(4) in addition, this method is applicable to produces the various metal powder coatings of preparation, particularly is fit to preparation metal fluorocarbon powder coating, thereby simplifies the preparation method of fluorine carbon dust coating greatly and successfully realize the preparation of ultra-fine fluorine carbon dust coating.
Summary of the invention
First purpose of the present invention provides a kind of routine and submicron metal coating.
Second purpose of the present invention provides the preparation method of this metal powder coating.
The 3rd purpose of the present invention provides a kind of coated metallic plate.
The present invention is difficult to produce charged even metal powder coating in order to solve prior art, and product coating unfairness and thickness is too high, the manufacture method production technique is complicated, performance difficulty, and cost is than problems such as height.
The object of the present invention is achieved like this:
Adopt organic solvent that coating resin is dissolved, add pigment and filler then, after high speed dispersion or sand mill dispersion, add metallic pigment and mix, regulate viscosity and carry out the pressurized spray drying, the powder metallic pigment that obtain are evenly wrapped up by resin, and powder has the ball shape of rule, even ultrafine powder is sieved, obtain having the submicron metal coating of fine flowing property under the situation that does not add or add very a spot of fluidisation promotor.
Metal powder coating of the present invention, moiety comprises that mass percent is a portions of 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 fluidizing performance preferably.
Metal powder coating of the present invention, wherein said resin are selected from the wherein a kind of of vibrin, urethane resin, Resins, epoxy, 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 handled 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). elder generation in organic solvent, adds pigment and filler with resin dissolves again, stirs;
(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.) that need, 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, screening obtains submicron metal coating after the high-speed stirring.
In organic solvent, passed through efficient dispersion processes such as liquid sand milling before powder of the present invention is granulated, made pigment and filler to be dispersed in better in the resin, thereby the coating that obtains has very outstanding opacifying power.
The organic solvent that the present invention uses is the organic solvent such as the pure ether solvent of butanone, toluene, dimethylbenzene and part of routine, 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 portions of resin pigment by mass percentage: 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 handled 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, Resins, epoxy, 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 flowability that fumed silica can improve powder coating, a small amount of interpolation can to a certain degree improve the flowability of the above powder of 25 μ m, then must add bigger 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 among the present invention adds a small amount of fumed silica and handles, and can reach mobile 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 the metal-powder coating is 20～40 μ m, has very even curface and even metal effect.
Coated metallic plate of the present invention, wherein said coated metallic plate comprise metal-powder PVDF fluororine-carbon coating metal sheet.
Shortcomings such as fluorine carbon dust coating is the same with other powder coating to have environmental protection, an economic dispatch advantage, but because technology limitation, and fluorine carbon dust coating exists also that cost is too high, surface finish difference and production process are loaded down with trivial details.And the research of metal-powder fluorocarbon coating and preparation do not appear in the newspapers as yet.Fluorocarbon coating almost all remains liquid coating on the market 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 an arosol spray moisture eliminator equipment synoptic 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 are done 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
Adding 15.0kg mixed organic solvents in 30 liters a mixing bowl (butanone: toluene: ethanol=70: 25: 5), under agitation add following material then:
Vibrin 6.0kg DSM N. V. 5900
Solidifying agent TGIC 0.5kg Vantico T810
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 under 190 ℃ temperature.The paint sheet coat-thickness that obtains is 40 μ m, and coatingsurface is very smooth and the ideal metal effect arranged.
As example 1, be 0.3 but regulate spray pressure, and regulate the atomizing effect of nozzle that 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 bigger tangerine line of ordinary powder coating.
As example 1, be 0.6 but regulate spray pressure, and regulate the atomizing effect of nozzle that making the diameter of particle that obtains is 10 μ m.The fumed silica of adding 1.0% mixes, and 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, be 0.5 but regulate spray pressure, and regulate the atomizing effect of nozzle that making the diameter of particle that obtains is 18 μ m.The vapor phase process aluminum oxide of adding 0.1% mixes, and coatingsurface is very smooth, and opacifying power is good, has the metallic surface effect.
As example 1, be 0.4 but regulate spray pressure, and regulate the atomizing effect of nozzle that 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
Adding 10.0kg mixed organic solvents in 30 liters a mixing bowl (butanone: toluene: ethanol=70: 25: 5), under agitation add following material then:
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 after high-speed stirring, cross sand mill, grind and make fineness reach 50 μ m when following, stop dispersion.Add the pearlescence of 0.7kg, carry out mist projection granulating after slowly stirring, the diameter of particle that obtains is 18 μ m, and the coating prod thickness is 35 μ m, has good metal table effect, extraordinary planeness.
Embodiment 7
Adding 14.0kg mixed organic solvents in 30 liters a mixing bowl (butanone: toluene: ethanol=70: 25: 5), under agitation add following material then:
Acrylic resin 5.3kg BASF AG
Certain herbaceous plants with big flowers diacid 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, the coated aluminium powder (Canbro company product) of adding 0.7kg.The diameter of particle that obtains is 18 μ m, and the coating prod thickness is 32 μ m, has the green metal look and the extraordinary planeness of light.
Adding 12.0kg mixed organic solvents in 30 liters a mixing bowl (butanone: toluene=80: 20), under agitation add following material then:
The vinylformic acid 7.0kg Rohm Haas B44 of company
The PVDF fluorocarbon resin 3.0kg AtoFina Kynar of company 711
Flow agent 0.285kg Worlee PV88
UV light absorber 0.015kg Cyba 1010
Processing mode is with example 1, but adds high weatherable pearly pigment 1.0kg (139X, Engherd product), and the model after the 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.
Prescription and preparation method such as example 8 are 0.6 but regulate spray pressure, and regulate the atomizing effect of nozzle, and making the diameter of particle that obtains is 10 μ m.The vapor phase process aluminum oxide of adding 1.0% mixes, and the coating film thickness that obtains is 30 μ m, and coatingsurface is smooth.
Prescription and preparation method such as example 8 are 0.5 but regulate spray pressure, and regulate the atomizing effect of nozzle, and making the diameter of particle that obtains is 15 μ m.The fumed silica of adding 0.1% mixes, and 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 influence not quite the preparation method of product of the present invention, and different raw materials is formed only needs suitably to regulate the solid spherical powder that working condition can both 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 also can be 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 metallic pigments by the metal powder coating that resin wraps up, and has avoided machinery Shatter the destruction to metallic pigments, the preparation method of the metal powder coating that this is new not only can prepare easily and has evenly The metal powder coating of chargeding performance, and can prepare the ultrafine powder paint with good flow performance. And it is normally used The method that 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 factors such as the surface area that greatly reduces and surface energy are so that of the present invention Powder has the littler powder ability of uniting, thereby has good fluidizing performance. Like this, not adding or add a small amount of conduct adds The fluidisation promoter that adds agent just can obtain the submicron metal coating products. And the high efficiency of liquid grinding distribution, so that coating Has very superior covering 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. Less than 10 The powdery paints of μ m has the shortcomings such as powder utilization is low, and actual production there is no need. Although the present invention will improve mobile scope Be limited to the above superfine powder of 10 μ m, but in fact substantially can satisfy the requirement that most particle diameters are used. The present invention can make The standby superfine powder that is suitable for improves the coating surface flatness greatly, also the thickness that has ordinary powder coating now can be reduced approximately simultaneously Half. The method is applicable to all coating varieties, compares with other existing superfine powder manufacture methods, have to implement easily, The series of advantages such as be free from side effects has very big market application foreground. Preparation ultrafine metal powders product has additive method The effect that can't obtain such as the method for Bonding.
The above-mentioned various advantages of the present invention are especially meaningful to the preparation of powder fluorocarbon coating especially metal dust fluorocarbon coating. Adopt Method of the present invention need not re-use the method that expensive loaded down with trivial details liquid nitrogen frozen shatters, and has found and successfully prepare ultrafine metal powders The new method of end fluorocarbon coating, this submicron metal fluorocarbon coating can obtain the fluorine that flatness is good, coating is thin, covering power is good Carbon coating, thus so that the powder fluorocarbon coating is significantly less than liquid fluorocarbon coating on the contrary on cost. The commercial Application of this invention will Change powder fluorocarbon coating use amount little now, bring very big environmental protection and social benefit.
Claims (13)
1, a kind of metal powder coating, moiety comprises that weight percent is a 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 sphere, and particle diameter is 10～50 μ m.
2, metal powder coating as claimed in claim 1 is characterized in that, described metal powder coating powder is similar sphere, 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, Resins, epoxy, polyester epoxy hybrid resin, acrylic resin, vinylformic acid fluorocarbon resin composition.
As claim 1 or 3 described metal powder coatings, it is characterized in that 4, described acrylic resin and fluorocarbon resin proportioning are 50/50～10/90, wherein preferred proportioning is 70/30.
5, metal powder coating as claimed in claim 1 is characterized in that, described metallic pigment comprise that coating that various coating handled with aluminium powders, aluminium paste, various pearlescence, with resin parcel or part parcel is with aluminium powder or aluminium paste.
6, a kind of preparation method as the described metal powder coating of above-mentioned any one claim is characterized in that described preparation method comprises following step:
(1). elder generation in organic solvent, adds pigment and filler with resin dissolves again, stirs;
(2). grind through high speed dispersion or sand mill, obtain the uniform liquid intermediate of pigment and fillers dispersed;
(3). add the metallic pigment that need, 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, screening obtains submicron metal coating after the high-speed stirring.
7, the preparation method of metal powder coating as claimed in claim 6, it is characterized in that described raw materials by weight meter portions of 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%.
8, as the preparation method of claim 6 or 7 described metal powder coatings, it is characterized in that, described resin is selected from the wherein a kind of of vibrin, urethane resin, Resins, epoxy, polyester epoxy mixture, acrylic resin, acrylic resin fluorocarbon resin composition, wherein said acrylic resin fluorocarbon resin composition proportioning is 50/50～10/90, and wherein preferred proportioning is 70/30.
As the preparation method of claim 6 or 7 described metal powder coatings, it is characterized in that 9, described metallic pigment comprise that coating that various coating handled with aluminium powders, aluminium paste, various pearlescence, with resin parcel or part parcel is with aluminium powder or aluminium paste.
10, the preparation method of metal powder coating as claimed in claim 6 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.
11, the preparation method of metal powder coating as claimed in claim 6 is characterized in that, described fluidisation promotor as additive is the fumed silica of 0.1～1.0% resin quality.
12, a kind of coated metallic plate is characterized in that, described coated metallic plate is to adopt the described submicron metal coating preparation of above-mentioned any one claim, and the metal-powder coat-thickness is 20～40 μ m.
13, coated metallic plate as claimed in claim 9 is characterized in that, described coated metallic plate comprises metal-powder PVDF fluororine-carbon coating metal sheet.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101302366A true CN101302366A (en) | 2008-11-12 |
| CN101302366B CN101302366B (en) | 2013-06-19 |
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| CN110669361A (en) * | 2019-09-02 | 2020-01-10 | 山东省产品质量检验研究院 | Preparation method of water-based coated aluminum pigment |
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