CN1205658A - Radiation-cured edge-masking process for high speed electrogalvanizing - Google Patents
Radiation-cured edge-masking process for high speed electrogalvanizing Download PDFInfo
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- CN1205658A CN1205658A CN 96199189 CN96199189A CN1205658A CN 1205658 A CN1205658 A CN 1205658A CN 96199189 CN96199189 CN 96199189 CN 96199189 A CN96199189 A CN 96199189A CN 1205658 A CN1205658 A CN 1205658A
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Abstract
In a high-speed electrogalvanizing process, steel strip (1) is protected from the formation of troublesome zinc nodules by masking the edges (12) of the strip, while the strip is moving and upstream from the electrogalvanizing step (11), with an ultraviolet curable coating, and curing the coating (8) while the strip is moving prior to introduction to the electrogalvanizing step (11).
Description
Affiliated technical field
The present invention relates to electroplate, the invention particularly relates to and prevent that in the high speed electrogalvanizing process strip edge edge or the place of keeping to the side from forming little zinc tubercle (nodules) with zinc.By sheltering the formation that coating reduces or reduce this zinc tubercle in that coating on the strip edge edge is can be under ultraviolet light irradiation quick-setting.This coating moves the limit at strip edge and is coated with selvedge curing, preferably is coated with at once in the upstream of electrogalvanizing operation.
Technical background
The objective of the invention is to solve the difficult problem that the zinc overdose deposition easily takes place when electroplating with zinc.Electrical quantity in zinc overdose deposition and the electroplating process can cause that particularly the high current density that " burns (burning) " in the edge is relevant.The excess deposition that the present invention relates to specifically is meant the formation of zinc tubercle.Sometimes claim this zinc tubercle to be " broccoli leaf head (cabbage heads) ", the formation of this zinc tubercle is not only undesirable, and tend to form loose coating, and can make the main position of band steel and/or finished product (as metal die method product) produce serious cut.This tubercle also can cause dent on the band steel, produce uneven and highlighted spot phenomenon.In the higher place of deposition zinc coating weight, the problem that the zinc adhesion becomes with broccoli leaf capitiform is just more obvious.Broccoli leaf head appears at the outermost edge and the vertical edge place of band steel usually, and broccoli leaf head tends to make the zinc coating weightening finish.
Desire to find the method that solves this difficult problem, because of the typical high-speed cruising of galvanization production line becomes very difficult.Before entering zinc-plated district, it is very common that mild carbon steel strip transmits on a series of delivery rolls with the speed of 1000 feet per minutes (305 meters/minute).Therefore, solve the aspect that this difficult problem requires to accomplish and be: if with a kind of lateral masking material coating of liquid state, then this coating should be in several seconds (2 or 3 seconds), curing fully in preferred 1 second.According to electroplating technical conditions, to other requirement of coating be: this coating should have enough toughness, stands mechanical friction suffered when transmitting at a high speed between rubber and metal delivery roll; Non-conductive and meet environmental requirement, nontoxic and easy to use before and use manipulate and be convenient to processing discarded object.In addition, the coating of lateral masking coating and the method for curing must make things convenient for and the energy continued operation, so that can not cause parking or cause other trouble.Different production facilities has different requirements and specific demand with production technology, and the operating personnel that art technology is skilled must remember when selecting coating.
The United States Patent (USP) 3390060 (1968) of Bedi discloses and has adopted two kinds of dissimilar waxes to protect the method for metal in electroplating process.Yet wax needs with the solvent coating, and it must be eliminated before test specimen uses.This technical process can not adapt with the electrogalvanizing production line of high-speed cruising fully, this is not only because coating can not be in a short period of time on the band steel " fixing ", but also because solvent discharges in atmosphere continuously, this is unallowed concerning the electrogalvanizing workshop in modern times.United States Patent (USP) 2516986 referring again to Heinse, this patent proposes to shelter stainless steel to prevent the method for plated with copper with wax, and the United States Patent (USP) 2999771 of Gaynes, this patent has been discussed a kind of acid-resistant paint that is used for chromium plating, and this coating is a kind of modification vinyl chloride-base polymer that is dissolved in the solvent.
People's such as Lipson United States Patent (USP) 4270985 is to adopt the representative of radiation curable resins as many disclosures of making the used for printed circuit mask agent; wherein; photopolymerizable resin is placed on copper sheet or the Copper Foil, as required on the circuitous pattern, and the non-protection area territory etched away.Galvanizing process can be regarded etched anti-process as, because this process is that this metal is added on the metal; The present invention relates to prevent that zinc from depositing to avoid forming the method for " broccoli leaf head " at the strip edge edge; The process of protection zone has nothing to do the method with etching away on the base material not.
The United States Patent (USP) 3390061 of Levinos is about utilizing all kinds of solvents base coating protection metal surface to avoid plating the representative of the disclosed content of other metal, with regard to this patent, treats that the another side of copper-plated aluminium sheet covers with this type of coating.These documents only illustrate that this class coating has been used to protect the metal surface in the electroplating process.Can be the United States Patent (USP) 4224118 of Hans referring to another example, this patent have proposed a kind of concrete resin as screening agent.Yet the present invention is not benefited from these disclosures, because these patents do not relate to the band steel that transmits at a high speed, and this type of coating can produce solvent fumes.Though people's such as Yoshioka United States Patent (USP) 4969980 has been mentioned high-speed galvanization, they just are coated on protective coating on the whole one side of band steel, to prevent that band steel two sides is all electroplated simultaneously in the galvanizing process.People such as White disclose in United States Patent (USP) 4587136 and a kind ofly allegedly can coat on the steel, are applicable to and of the present inventionly contain silicon composition (the 6th hurdle, the 2nd row), but the applicant will not coat purposes on the steel as its goal of the invention and scope.
People such as Tsuruta are in Japanese publication 58-113396 (1983), by adopt a kind of machinery, shape is generally as the lateral masking device of passage or the tubulose that vertically cracks or shelter cover, address the edge and cross the problem of excess zinc on plating or the finished product edge coating, in this representative patents, make the strip edge edge pass the open area of the semicircle or the U type (section) of lateral masking device or radome, flow to the outer peripheral power strength of band steel so clip and reduced.This class document is enough to illustrate and emphasized the importance of this problem.This class and other method that addresses this problem from machinery easily produce many maintenances and control problem.Referring to the United States Patent (USP) 4784740 as people such as Murakami, this patent is understood a kind of locator of using for this class plant equipment specifically.In Japan Patent 158386, U type (section) radome is the auxiliary equipment that adopts solvent based paint coating zone steel vertical edge.
Japan Patent discloses flat 6-158386 (1994) method that conventional coating is coated on the strip edge edge is described and has introduced in the electrogalvanizing process.Its objective is to prevent the excessive plating in edge, but do not have this method and electrogalvanizing process are considered as integral body, promptly do not have will be when band steel high-speed mobile and the coating of the coating before being about to enter the electrogalvanizing operation and curing process and electrogalvanizing operation regard an integral body as.
State-of-art existing explanation in the United States Patent (USP) 5298072 of Schiele of relative edges coating apparatus is arranged, and this patent has been introduced a kind of vacuum aided system that is used for liquid coating is drawn to from the material pond coating surface of wanting.Excessive coating can recycle more economically.The concrete structure of edge dispense tip 3 be can change to adapt to the requirement of various different workpieces and continuous feeding mechanism.Also can be referring to the United States Patent (USP) 5070080 of Schiele, this patent disclosure a kind of continuous vacuum coated device.
Wood has introduced the method that the liquid coating that utilizes ultra-violet radiation to make effectively to contain light trigger solidifies in United States Patent (USP) 4710638.This patent to be illustrating a kind of oval-shaped reflector that is shaped as, and this reflector is the electrodeless ultraviolet source of tubulose that excites of free microwave energy and the radiation that produces guides on the elongated workpiece in the future.The operation principle of oval reflector is: the light of launching on a focus of ellipse must be by another oval focus.The reflector that Wood proposes help to guarantee to be placed on the light launched at the tubular light source center on the oval focus can efficiently and effectively project on the workpiece that places oval another focus and focus around.
The disclosure of invention
We have found that, in the electrogalvanizing process, forming width on a surface by coating ultraviolet light polymerization, non-conductive being coated on electroplated zinc or the edge on two surfaces is 1 millimeter to 7 millimeters, be preferably the banded coating in about 1/8 inch edge, can prevent near strip edge edge or edge, to form unwanted zinc tubercle; The vertical edge of band steel also is with this non-conductive coating protection.Only coating is coated on the edge on a wide surface of band steel and contains a positive effect; this work pattern to need only to can be used for situation that one side electroplates, and (this work pattern also can be used for the situation that the two sides all need be electroplated; but broccoli leaf head still can appear in unprotected one side) or be used near the edge on two sides, or be used for vertical edge (only be coated with vertical edge or be coated with simultaneously) with one side or with another side.Preferred pattern be with coating be coated in the outer peripheral shaped like narrow zone of the upper surface of band steel and lower surface with vertical edge on, specifically, be each lateral edges that is coated on the band steel of two sides electroplated zinc.We can and can make coating in very short time with radiation mode with the liquid coating coating, generally are less than in 1 second and solidify, and therefore, this coating can be stood violent electrogalvanizing process when entering electroplating work procedure at once subsequently.The banded painting process in edge has been included high-speed and continuous electrogalvanizing production line in.
Brief description of drawings
Fig. 1 represents that the banded painting process in edge of the present invention and what belong to the band steel electrogalvanizing flow chart of conventional high speed electrogalvanizing production line simplification in aggregates.
Fig. 2 a and 2b be depicted as a kind of preferred, coating can be coated on pneumatic type or vacuum type coating coater head on the mobile strip edge edge.Fig. 2 a is the upright sketch of looking of the side direction of coater head; Fig. 2 b is the perspective view that the band steel is in coating coating position.
Fig. 3 is about being used for solidifying illustrating of the uviol lamp position that is coated on coating on the strip edge edge and operation principles.This curing operation also carries out when band steel high-speed mobile.
Implement mode of the present invention
Can be coated on to form the thin banded coating of one deck on the strip edge edge of per minute 100-1200 foot high-speed mobile and can in seconds preferably be less than in 1 second to become to have adhesiveness, nonconducting solid-state any coating all to can be used for the present invention with liquid state through cured with ultraviolet radiation.This banded shallow layer can be coated on the one or both sides of band steel, and this coating can comprise or not comprise vertical edge.
It is well-known being suitable for the composition of making this type of coating, we can say that they comprise (a), at least a reactive oligomers or prepolymer usually, (b) at least a monofunctional monomer, (c) optionally be, the polyfunctional monomer that at least a selection and oligomer are crosslinked and (d), at least a ultraviolet initiator.The present invention relates to adopt and be substantially free of opaque pigment of ultra-violet radiation and filler and be substantially free of the application of any this type of coating composition of non-reactive solvent.
Though can allow to exist on a small quantity to the opaque pigment of ultra-violet radiation, filler and other mineral matter or solid, but do not recommended, because, they can increase and are used to solidify the required amount of radiation of set amount coating in general, if above-mentioned substance exists too much, before can making the band steel enter the electrogalvanizing operation, coating is difficult to solidify fully or not may solidify fully.If coating enters the electrogalvanizing groove with its uncured state, coating can be easy to from being with steel to come off and can making process systems become dirty at once.
Consider the safety factor in workshop, this coating composition also should be substantially free of non-reactive solvent, and this is volatilizations, inflammable even also have explosive under steel plant's normal condition because of: many solvents; Also because need vented exhaust and/or lyosoption and/or because of solvent continuously in the environmental problem that causes of volatilization and the coating composition a part of composition can not utilize and can waste.Though as long as the amount of solvent can exceedingly not postpone curing schedule, can allow non-reacted on a small quantity, volatile solvent in the formulation for coating material, the inventive method only adopts the composition that is substantially free of this kind solvent.
Everybody can notice in being discussed below, and we do not avoid effect and the function of solvent in coating composition, particularly adjusts the function of composition viscosity; On the contrary, we have also selected to bring into play simple function polymerisable (reactivity) monomer of this function.
Being suitable for all compositions of making coating composition is described below:
(a) reactive oligomers or prepolymer, perhaps the most frequently used reactive group is an acrylic acid groups in cured with ultraviolet radiation coating.Acrylate moiety has connected epoxides, polyester, polyethers, carbamate, polysiloxanes, polybutadiene and other acrylic acid.Being used for the typical acrylic monomer of reaction of formation oligomers or prepolymer is acrylic acid, hydroxyethyl acrylate, acrylamide and acrylic acid glycidyl esters.Typical prepolymer or oligomer are epoxy acrylate, urethane acrylate and polyester acrylate.A simple example is two mol propylenes acid hydroxyethyl ester and one mole of vulcabond, as the product of toluene di-isocyanate(TDI).React reactive oligomers that contains two or more reactive ethylenic unsaturated groups and the prepolymer that makes by this class, concerning realizing the object of the invention, be best suited for, this mainly contains, and two reasons-they are to have occupied the big molecule that needs coating space certain volume and they contain two or more, crosslinked reactive group is carried out in preferred several meeting, therefore can be solidified into solid-state rapidly.
To the best illustrated that can be used for acroleic acid esterification carbamate of the present invention can be in the United States Patent (USP) 5258225 of Katsamberis the 7th hurdle the 3rd walk in the 8th hurdle the 19th row and find, list this patent content in the present invention for your guidance.Alkyl acrylic esterification carbamate (as the methacrylated carbamate) described in our the preferred especially katsamberis patent is as reactive oligomers of the present invention or prepolymer.The unsaturated polyurethanes of the available radiation polymerization that is proposed in United States Patent (USP) 4399239 by people such as Herwig also is suitable for, and the full content of this patent has also been listed this paper in for your guidance.People such as Fujimoto walk to the compound of having listed the photopolymerization that contains two or more pairs key in the 5th hurdle the 18th row on the 4th hurdle the 40th of United States Patent (USP) 4379039, also can consult it.
(b) monofunctional monomer, the most frequently used monofunctional monomer is a styrene.Though styrene is more volatile, but can intercept by the reaction rate that is exceedingly fast that light-initiated method caused and with the physical property that compound crosslink produced and prevent that styrene monomer from advancing into the trend of atmosphere in polymerization, thereby accomplish to control cinnamic distributing.Other monofunctional monomer that is suitable for comprises list (methyl) alkyl acrylate of AMS, chlorostyrene, alkyl acrylate and alkyl methacrylate, list (methyl) acrylic acid PAG ester and replacement.Single unsaturated compound of any photopolymerization all is among considering.Styrene and most other reactive monomer can play solvent or diluent at least to a certain extent, so we can utilize this character to control viscosity.Yet as mentioned above, because organic solvent can discharge in atmosphere at least to a certain extent, therefore, we avoid adopting organic non-reactive solvent usually.People such as Hung the 7th hurdle 5-55 in United States Patent (USP) 4761363 is capable to provide a series of be applicable to " reactive diluting monomers " of the present invention, and this content has been listed this paper in for your guidance.
(c) Ren Xuan polyfunctional monomer, two common and polyfunctional monomer or crosslinking agent are diacrylate tripropylene glycol ester, hexanediol diacrylate, diacrylate diethylene glycol (DEG) ester, diacrylate TEG ester and compound with following general formula
N is the integer of 1-4 in the formula, preferred 2 or 3, and R is selected from the hydrocarbon residue of n sense and the substituted hydrocarbon residue of n sense, R
1For hydrogen or usually as Katsamberis the 3rd hurdle 65 in United States Patent (USP) 5258225 walk to the 5th hurdle the 3rd capable described low-grade alkyl group, as methyl, this patent content has been listed this paper in for your guidance.The diacrylate that is suitable for comprises diacrylate 1,6-hexylene glycol ester, diacrylate 1, the 4-butanediol ester, ethylene glycol diacrylate, diacrylic acid pentyl diol ester, dimethacrylate 1,4 butanediol ester, four alkanoic acid pentaerythritol esters, diacrylate trihydroxymethylpropanyl ester, dimethacrylate bisphenol-A ester and dimethacrylate macrogol ester.The polyfunctional monomer that is suitable for comprises trimethyol propane triacrylate, three acrylic acid glycerine propoxyl group esters and three acrylic acid trimethylolpropane ethoxylated esters.
Because only contain basically above-mentioned (a) and (b) and (d) performance of the coating of component just can satisfy requirement of the present invention well, therefore the polyfunctional monomer of choosing wantonly just is used as optional component.Yet, many common commercially available ultraviolet cured paint compositions contain intermediate molecular weight and the material of polymerizable groups number between oligomer/pre-polymer component (a) and monofunctional reactant monomer component (b), although the molecular weight of clearly not stipulating size boundary line.This listed class intermediate molecular weight compound in the epimere explanation is easy to poly-ly be associated with very high cross-linking efficiency as everyone knows, is applicable to the inventive method.
(d) light trigger, the light trigger that is suitable for comprises the ketone light trigger, as benzophenone and other acetophenone class, diphenylthanedione, benzaldehyde and o-chlorobenzaldehyde, xanthene ketone, thioxanthones, 2-chloro thioxanthone, 9,10-phenanthrenequione, methyl benzoin ether, ethyl benzoin ether, diethoxy phenyl acetophenone, isopropyl benzoin ether, α, alpha, alpha-dimethyl oxygen base acetophenone, 1-phenyl-1,2-propane diols-2 o-benzoyl oxime, 2-EAQ, 2-butyl anthraquinone, prestox anthraquinone, α-phenyl benzoin and α, alpha, alpha-dimethyl oxygen base-α-phenyl acetophenone.Be worth recommending the commercially available light trigger that is used for ultraviolet light polymerization to comprise 2-hydroxy-2-methyl-1-phenyl-propane-1-ketone (by " Darocure 1173 " of EM Chemicals ofHawthorne NY sale) and 2 especially, 2-dimethoxy-2-phenyl acetophenone or " Irgacure 651 " (selling) by Ciba-Geigy.See that the 6th hurdle 10-29 is capable in the United States Patent (USP) 5260350 of Wright.The aromatics sulfonic acid chloride also is applicable to the present invention as 1-naphthalene sulfonyl chloride and 2-naphthalene sulfonyl chloride and various dicarbonyl compound.United States Patent (USP) 3850770 the 4th hurdle 60-65 that sees Juna is capable.The capable listed light trigger of the 6th hurdle 3-63 is to be applicable to of the present inventionly in the United States Patent (USP) 4379039 of Fujimoto, and its content has been listed this paper in for your guidance.
Light trigger can use according to conventional amount used, is 0.1-5 (weight) % of coating composition weight.
The suitable coating that does not comprise optional components (c) should comprise about 30-90 (weight) % component (a), about 10-70 (weight) % component (b) and about 0.05-5 (weight) % light trigger.A kind of like this prescription is arranged, and wherein the addition of component (c) can reach per 100 parts of (weight) compositions (except that (c) component) for about 75 parts (weight).The another kind of method for expressing of prescription is to represent that with the component (a) and the weight rate of component (b) its suitable ratio is about 0.4: 1 to about 9: 1.Other coating that is suitable for comprises being less than under ultraviolet light irradiation and is solidified into the solid-state any coating of non-conductive property in 10 seconds.
Any method of painting or other coating is applied on band steel (wide surface) edge that transmits with 100 feet-1200 feet speed of per second all is included within the scope of the invention.These methods comprise roller coat, spraying, injection and edge impregnation.Minimum for overspray is reduced to, we are preferential adopt as shown in Figure 2 more or less surrounded a kind of pneumatic type or the vacuum type coating device that will be coated with the surface, and preferably include for capturing and recycle those again otherwise can spill into the device of the droplet in the atmosphere; Preferred commercial plant also should have in order to collect and/or to handle any vacuum or exhaust unit that can distribute the volatile component in the atmosphere from liquid coating.
After the curing, most of described coating is transparence basically, thereby is difficult for being observed.For this reason, can mix a spot of one or more observable organic principles, as fluorescent dye.This class dyestuff is normally nonvolatile, thereby can not influence the realization of non-conductive coating this purpose of coating on the strip edge edge.
Fig. 1 has drawn a kind of for the preferable process of being with steel to carry out zinc-plated processing.In Fig. 1,, feed pickling tank 9, potcher 10, electrogalvanizing district 11, potcher 12, side cut treatment region 13 then and enter collection volume device 14 and be rolled into the band coil of strip by a series of transfer rollers 3, send into dry section 6, as shown in Figure 2 edge applying area 7 and ultraviolet light irradiation or curing area 8 from the band steel that comes out of band coil of strip 2 through caustic alkali rinse bath 4 and potcher 5.Can adopt the clear groove 4 of causticity and potcher 5 of any conventional type, therefore, in fact cleaning area is sizable different with treating that zinc-plated concrete coil of strip can have.Usually, for the result who obtains, the band steel should clean, and this knows in the electrogalvanizing technical field.In addition, for the present invention, need remove residual charcoal and iron from belt steel surface, because residual charcoal and iron conduct electricity, if its amount reaches enough degree, will influence coating, the enforcement of edge coating this purpose, this coating is to be used for making at the edge of the band steel in electrogalvanizing district 11 becoming electric insulation.Any effective cleaning method all can be used for the present invention, and certainly, if the band steel has been cleaning, that just needn't adopt cleaning area.Equally, any effective dry method all can be used for dry section 6.Before the band steel entered applying area 7, band steel or edge to be coated at least should be quite dry.Applying area 7 and ultraviolet light irradiation (curing) district 8 is further described in Fig. 2 and Fig. 3 respectively.
In Fig. 2 a, can see that coating that applying area 7 the is adopted head 15 of filming has upper and lower nozzle 16 and 17, this two nozzle discharges respectively from flexible pipe 18 and 19 and the coating of conduit 20 and 21.The head 15 of filming also has a vacuum draw mouth 22 that is connected to the vacuum plant (not shown) by flexible pipe 23.By depressurization, liquid coating in the basin (not shown) is pumped into applying area 24 by flexible pipe 18 and 19, shoot down on band steel 1 at applying area coating; The depressurization that is applied to applying area by pump orifice 22 and flexible pipe 23 can reduce that overflow and/or excessive coating, and can be used for reclaiming this that overflow with excessive coating.Also optional is to make the coating atomizing by air turbulence, the first-class method of atomizing.A kind of preferred, utilize and be similar to the film edge spreader of head of Fig. 2 and narrate in United States Patent (USP) 5298072 by Schiele, this patent full content has been listed this paper in for your guidance.
Fig. 2 b represents to be on the coating position of the head 15 of filming with steel 1.Described in other paragraph of this paper, the speed of service per minute of band steel 1 can be 100-1200 foot or higher; Usually, adopt the edge spreader that proposes in the United States Patent (USP) 5298072 of above-mentioned Schiele can easily control the coating weight that is coated on the band steel 1.The reader can understand, if only one of flexible pipe 18 or 19 are vacuumized, coating can only be coated on the corresponding belt steel surface, and vertical edge also can be covered by coating, although coating layer thickness is thick can not resembling when being sprayed simultaneously by two nozzles 16 and 17.
One or more coating and solidification equipment as shown in Figures 2 and 3 all can be placed in the relative both sides of band steel, and band steel two continuous boundaries are coated with and solidify, this also is self-evident.
What Fig. 3 described is the part of curing area 8, and illustrates the method for optimizing of the coating that is coated on the strip edge edge being implemented ultraviolet light irradiation.As seen in Figure 3, from the band steel 1 of edge applying area 7 opening, and be exposed under the ultraviolet light irradiation that the well-known a kind of quartz bulb UV radiation source 13 commonly used in present technique field launched by reflector 14.The section of reflector 14 is oval, and therefore, when the band steel passed through reflector 14, ultraviolet light can be reflected to band steel 1 and be coated with on the edge 12 residing elliptic focus.This class reflector has been done introduction by Wood in United States Patent (USP) 4710638, this patent has explained oval reflector is how to utilize in fact from strictness to place very little radiant energy on the elliptic focus; Even, but still can implement effectively to solidify because workpiece also occupies certain space and can strictly not be on the focus of oval opposite side.The full content of above-mentioned Wood patent resembles to be similar to has listed this paper in for your guidance method for optimizing that is used for solidified coating that Fig. 3 describes in detail and the device.
The degree of depth in the space can limit required banded coating width easily between 1 insertion 16 and 17 of band steel by the size and Orientation of adjustment vacuum and/or paint spray nozzle 16 and 17 and by adjusting.In other systems, can adjust the width of coating by the width of adjusting spraying or the spacing of spraying or adjustment roller or other coating device, and can or side by side or in turn coating be coated on two sides and the vertical edge.Solidifying the back coating layer thickness is unnecessary greater than 1 mil; Usually, thickness waste that tends to cause coating material above 0.002 inch.Do not consider the coating composition, the thickness after coating is solidified should be at least 0.25 mil, promptly about 0.00025 inch.
Shine the irradiation of specified point on coating with light trigger in the content of monomer and polymer, the concrete coating composition the efficient and the coating layer thickness of coating and different.Implementing the mode of irradiation also should select according to strip speed, that is to say, if the speed of service at the band steel is 500 feet per minutes, specified composition needed 0.5 second can make the completely crued words of certain thickness coating under the radiation source irradiates of setting intensity, can determine so, the band edge that will solidify on the band steel must be moved 50 inches under this radiation intensity irradiation, promptly move the distance that moves for 0.5 second with steel.If strip speed is 1000 feet per minutes then should moves 100 inches under the radiation source irradiates of setting intensity with steel.The setting radiation intensity itself that puts on the strip edge edge is again the function of radiation source intensity, also is the function of radiation source and strip edge edge distance in many cases.Since adopt reflector, oval reflector as shown in Figure 3, and distance is clearly to the influence of radiation intensity.
Two or three or a plurality of as shown in Figure 3 uviol lamp and reflector combined serial can be used, therefore can satisfy the requirement of high speed electrodeposition.600 watts and 8 inches long quartz uv lamps of the per inch that is purchased can be used in the reflector (as 14).Three such uviol lamp arranged in series generally can adapt to the requirement of at present high speed electrogalvanizing streamline.
Noun " electrogalvanizing " is defined as and adopts electric current to carry out zinc-plated.Yet, well-known, may contain a small amount of other metal in the zinc as lead, antimony and especially nickel or iron.Some zinc/nickel and zinc/ferrous components can be thought alloy.Present invention resides in the process of this class coating of deposition in the electrogalvanizing operation.Therefore, when we used noun " electrogalvanizing ", we referred to and comprise that deposition contains a large amount of zinc, the i.e. method of any coating of at least 50% zinc.
After zinc-plated operation, with conventional method before the steel band rolling to the processing of cutting edge of the banded coating in the edge of galvanized steel strip.
The invention will be further described with regard to following example.
Wide in the coating of the edge of specimen strip with the coating of various uV curables is 1/8 inch coating, with cured with ultraviolet radiation, and makes it stand the various conditions of the zinc-plated streamline of analog electrical.Specifically, in 140 (60 ℃) 15 (weight) %HCl solution and conventional galvanizing solution, tried.To test the tack of checking coating by an obstructed overcompression; All samples all obtain by, be 3000 peace/feet in current density then
2, simulation electroplates sample in the laboratory under the 500 feet per minute streamline speeds of service.For few, and tubercle does not appear to the tubercle that occurs on the zinc coating in the side at edge during more usually without coating.
Therefore, the present invention can regard a kind of method that prevents to produce at the edge when standing electrogalvanizing with steel the zinc tubercle as, this method comprises the coating that is coated with the thin liquid uV curable of one deck at least at a lateral edges of described band steel, then with ultra-violet radiation this coating is solidified before the band steel enters the electrogalvanizing groove.More particularly, the present invention includes coating with uV curable and be coated at least on each lateral edges with the band steel of 100 feet per minutes operation, before the band steel enters electrogalvanizing with such speed operation with this coating of cured with ultraviolet radiation.This coating can be can be with ultra-violet radiation in 5 seconds, in preferred 3 seconds and more preferably less than solidifying in 1 second, and is nonconducting any coating.On another kind of meaning, present invention resides in the band steel and enter the cleaning tape steel step before the electrogalvanizing district, dry described band steel, the coating of uV curable is coated at least on each lateral edges with the speed of 100 feet per minutes or the band steel that moves to 1200 feet per minutes or faster speed soon, the coating that is moving with cured with ultraviolet radiation and make this band steel enter the electrogalvanizing district to carry out zinc-plated.
Industrial usability
The present invention is applicable to the electrogalvanizing streamline of electroplating the band steel with commercial scale.
Claims (19)
1. one kind prevents that in the process of high speed electrogalvanizing the strip edge edge from producing the method for zinc tubercle, this method is included in the band steel is coated with a liquid uv-curable when moving with the 100 feet per minute speed that are at least at the edge of described band steel coating, and with the described coating of cured with ultraviolet radiation.
2. the process of claim 1 wherein that the coating of described uv-curable contains (a) multifunctional oligomer or prepolymer, (b) monofunctional monomer and (c) light trigger.
3. the process of claim 1 wherein that the thickness after the described coating curing is 0.00025 inch-0.002 inch.
4. the process of claim 1 wherein that described coating comprises at least a oligomer and at least a reactive diluting monomer.
5. the process of claim 1 wherein that the width of the banded coating in described edge is 1 millimeter-7 millimeters.
6. method as claimed in claim 1, wherein said curing are less than in 1 second and implement to solidify accepting radiated time.
7. the process of claim 1 wherein that the continuous boundary of described band steel both sides all is coated with the banded coating in edge.
8. the process of claim 1 wherein that the upper and lower edge and the vertical edge of described band steel all scribble the banded coating in described edge.
9. on the high speed electrogalvanizing streamline, make the method for electrogalvanizing band steel; this method comprises: described band steel is on the electrogalvanizing streamline during high-speed mobile; (a) at least one lateral edges of this band steel the coating one radiation-hardenable coating and make it to solidify to protect the edge of this band steel; and (b) in the electrogalvanizing district this band steel is carried out zinc-plated, thereby reduce the incidence that the zinc tubercle generates.
10. the method for claim 9, wherein said coating contains multifunctional oligomer and reactive diluent monomer, and their weight rate is about 0.4: about 9: 1 of 1-.
11. the method for claim 9, wherein said coating comprise the light-initiated dosage of effective dose and are cured with ultra-violet radiation.
12. it is banded that the method for claim 9, wherein said coating are on the edge of this band steel, the width of this coating is the 1-7 millimeter.
13. the method for claim 9, wherein said coating be by the air flow coat cloth that vacuumizes and solidify with the UV source of microwave-excitation.
14. the method for band steel electrogalvanizing, this method comprise make the band steel with the speed of at least 100 feet per minutes move, through a series of procedure of processings, these steps have (a) cleaning tape steel, (b) but become the liquid coating of non-conductive solid to coat at least one lateral edges of this band steel cured with ultraviolet radiation, (c) this band steel is implemented electrogalvanizing with this coating of cured with ultraviolet radiation and (d).
15. the method for claim 14 then will cut with a lateral edges that has been coated with at least of steel.
16. the method for claim 14 is a drying steps behind the wherein said cleaning step.
17. the method for claim 14, wherein said translational speed are 100 feet per minutes-1200 feet per minutes.
18. the method for claim 14, wherein said coating are to implement by the air stream that vacuumizes.
19. the method for claim 14 then will cut with the both sides of the edge that have been coated with of steel, and rolling should the band steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96199189 CN1205658A (en) | 1995-12-20 | 1996-12-18 | Radiation-cured edge-masking process for high speed electrogalvanizing |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/575,816 | 1995-12-20 | ||
| CN 96199189 CN1205658A (en) | 1995-12-20 | 1996-12-18 | Radiation-cured edge-masking process for high speed electrogalvanizing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1205658A true CN1205658A (en) | 1999-01-20 |
Family
ID=5129362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96199189 Pending CN1205658A (en) | 1995-12-20 | 1996-12-18 | Radiation-cured edge-masking process for high speed electrogalvanizing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1205658A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617911B (en) * | 2001-12-05 | 2010-04-28 | 坎梅陶尔股份有限公司 | Polymeric coating mixture, method for applying this coating mixture to a metallic base for protecting an edge or a part protective layer, a base coated in this manner and the use thereof |
-
1996
- 1996-12-18 CN CN 96199189 patent/CN1205658A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617911B (en) * | 2001-12-05 | 2010-04-28 | 坎梅陶尔股份有限公司 | Polymeric coating mixture, method for applying this coating mixture to a metallic base for protecting an edge or a part protective layer, a base coated in this manner and the use thereof |
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