CN1198108A - Method for powder coating and powder for use in said method - Google Patents
Method for powder coating and powder for use in said method Download PDFInfo
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- CN1198108A CN1198108A CN96197273A CN96197273A CN1198108A CN 1198108 A CN1198108 A CN 1198108A CN 96197273 A CN96197273 A CN 96197273A CN 96197273 A CN96197273 A CN 96197273A CN 1198108 A CN1198108 A CN 1198108A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0209—Multistage baking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
A method and a powder for powder coating in which objects (2) which are to be powder coated are prepared in order to temporarily retain the powder, whereafter the powder is applied onto the object in a layer which is retained on the object until the powder, by means of melting and transformation to a solid state by means of curing, is caused to form a coating layer on the surfaces of the object. The powder is prepared in order to have a low melting and softening temperature below about 100 DEG C and preferably 60-100 DEG C, and comprises an initiator system arranged to bring the powder material to curing under the influence of electromagnetic radiation. The powder prepared in this way is heated on the object to a temperature such that it melts and forms an adherent layer on the coated surfaces of the object. Thereafter, this layer is subjected to the radiation, thus curing it to a coating layer covering the powder-coated surfaces.
Description
Technical field:
The present invention relates to the method and the device that is used to implement this method of powder coated.
Background technology:
Powder coated is the well-known method that is used to apply object, and this starting material is charged powdery paints, and it is sprayed towards object surfaces, finally makes this material adhesion and changes solid state into by being heated to its fusing point.Owing to the plastics that this powder is solidified by heating are formed, therefore, must be heated about 200 ℃ higher temperature.
This painting method can carry out on the object with good heat resistance and conductive surface well.If this surface is non-conductive, this just means and can not or can not apply the electric charge of opposite polarity to powder feed with this object ground connection, thus make this powder spraying and be heated to its melt temperature during the difficulty that adheres to appears.
When relating to non-conductive when surface, in some technology, by applying this object with conductive lacquer, or make its immersion so that form the state in conduction water-bearing layer in its surface, solved some difficult problems that between powder and object, obtain opposed polarity.Yet, because said method has some shortcomings, for example varnish and relate to additional operation and the other material that adds of needs, and compare with the powder coated on the clean surface and also may cause bond quality poor, in addition, when relating to clear varnish, also may fade, thereby these methods only obtain limited application.
Interpolation water may weaken the adhesion strength of powder coating, and because the water seal that is added may make object be damaged under this coating.
At DE, A1 discloses the another kind of method of powder adherence to the non-conductive body surface that make among 3211282 (the August Albers).In described document, will have good heat resistance and mention it being that a kind of object of glass object is heated to 400-900 ℃.This just makes the powder particle fusion of this object of bump and is attached on the object surfaces, thereby makes it that uniform solid state take place to solidify and finally change into.Existing at a lower temperature deformation or what his aspect in office change dangerous object and can not handle under the desired high temperature of this method.Therefore, said method can not be used for the object that timber for example or plastics are made.
Summary of the invention:
Purpose of the present invention is intended to obtain a kind of method, and this method can be used for being unsuitable for being heated to higher temperature and should be limited in about 100 ℃ and the powder coated of the object of low temperature more as far as possible.When relating to the object with non-conductive surface, this method can be carried out under the situation that does not need to be coated with conductive lacquer or interpolation moisture.Therefore, this method is applicable to and applies wooden object for example furniture and the object that is made of plastics, for example owing to the reason of toughness or cost from a kind of than the plastics that more may provide the surface of different outward appearances to select for the object of finish with engineering plastics itself.When relating to wooden object, this coating can be the clear varnish that can make the grain of wood eye-catching.
This method comprises following key step according to the present invention:
I. the preparation powder that is used to apply, described powder have the low melting point that is about 60-100 ℃ and by can particularly forming by the polymer of solidified by ultraviolet ray radiation by electromagnetic radiation.
II. by such method object is carried out preliminary treatment, make this powder because fusion and curing and can remain on this object surfaces until reaching adhesion enduringly.This can adopt independent or interactional distinct methods realization according to the material and the appearance design of object, for example
A) object is heated to the melt temperature of powder, this powder particle is adhered on the object surfaces in melting process.All can adopt powder composition disclosed herein to carry out at low temperatures no matter whether this object has conductive surface.
B) dusty spray in being heated to the environment of following degree, promptly this powder reaches its melt temperature, and is in to be molten to and is the thickness state at least, can adhere on this object surfaces.
C) effect by electrostatic force keeps this powder, thereby gives a kind of electromotive force of this powder and make this object have the electromotive force of opposite polarity.When relating to the object with conductive surface, this can realize.When relating to object, can call the turn disclosed method according to the order of sequence and adopt conductive lacquer or dampening to be made into the surface of conduction with non-conductive surface.Other methods that can make this object have opposite polarity also can adopt.
III. can in powder spraying chamber, reach good distribution by this way when this powder particle and during static electrification, preferably adopt spraying process to carry out the coating of powder.Yet this method of not repelling by other applies, and for example can carry out dip-coating in fluidized powder bed.
IV. heating is so that make this powder particle be molten to the levelling layer state and adhere on the object surfaces.Can obviously find out from above (IIa and b), by realizing making powder attached on the object surfaces on this object or surrounding environment heating, thereby can make powder coating and the heating in same operation, take place, therefore, behind coating powders without any need for extra heating.
V. preferably this object is exposed in the ultraviolet radiation, thereby causes solidification process.
Can find out obviously that from the above this method can be carried out under the situation that does not form opposite polarity between the powder of static electrification and the object.Yet, for make this powder distribution on all surface of this object particularly when this object has complicated configuration, a kind of like this polarity difference still can be arranged and be valuable.Therefore, this method do not require but do not repel object yet be with any electricity or neutral state, for example when relating to the object that non-conducting material makes, can be by disclosed any method in the additional preamble, apply or in addition wetting with conductive lacquer.In addition, when they are heated, can obtain electrostatic charge in some material, this is a kind of way that can utilize in some cases.
The present invention also comprises the powder that is used for this method.
Description of drawings:
The device schematic diagram that is used to implement the inventive method has been shown in the accompanying drawing.
Embodiment preferred:
The summary of the inventive method has been disclosed in the preamble of this specification.According to described, this method comprises some key steps.Now these steps with a certain embodiment are described in detail as follows.In described embodiment, for the specific (special) requirements that makes this method can adapt to this embodiment has been done to replenish to these key steps with some substeps.Step I: the preparation of powder
This powder is made up of polymer, and can be to be used for coloured coating and painted or being used for clear coat makes basal surface can see that and uncoloured, this is the thing of often making every effort to when relating to wooden object.Main characteristic is that fusing point that this powder has must be lower than the object of preparing with this powder coated and should heat the temperature that reaches.This temperature extremes partly depends on the material character of this object, and this is because the structure of some material can change (being lower than 100 ℃ when relating to some thermoplastic) under the quite low temperature.When described temperature extremes also partly depends on the heating of this object to the sensitiveness of deformation.Described sensitiveness depends on the structure of this object, and the object with fine and close shape is easy to deformation unlike dish or slender body, and the uniformity that sensitiveness also depends on material in this object how; Some timber kind is highstrung in when heating to deformation.The fusing point of this powder or the base region of softening point can be defined as 60-100 ℃.
Will be understood that from following explanation, will not be heated to the melt temperature of this powder by whole object, and only heat its surface, yet, the degree of depth that reaches should be able to make temperature be evenly distributed in very much on this object, and promptly keep by this way this temperature until powder coated on object surfaces.With regard to word " melt temperature of powder ", it does not also mean that this dusty material fluidify, and still, in many cases, this temperature is enough to make powder to reach softening degree, so that can adhere on the predetermined surface to be coated.
In fact, when with the powder coated object, it is favourable only needing the surface is heated and made temperature keep low, though the higher temperature of the certain ability of these objects,, be disadvantageous in any case be heated to higher temperature.Situation is like this, for example when relating to the big object of weight, is heated to higher temperature and need consumes a large amount of heat energy.Particularly when relating to the object of conductive material, this heat can inwardly be spread rapidly.An example is the solid cast object, and this consumes big energy with regard to quite long heat time heating time of needs if adopt additive method rather than method of the present invention.
Another key property that this dusty material should have is that its curing can cause by electromagnetic radiation.According to present technological level, when particularly relating to industrial production, adopt ultraviolet ray (UV) radiation and make this polymer powder adapt to this method to have shown it is best.Therefore, in the going on to say of this embodiment, still look to adopting the UV radiation.Yet, for the purpose of the present invention, do not repel the electromagnetic radiation of adopting other.In addition, can adopt the combination of dissimilar radiation.
Since this powder except that levelling agent at least some by polymer for example polyester form, therefore, under low melting glass, can obtain good levelability.
If polymer is mixed with initator by known method, or adopt another kind of method, being equipped with can be by radioactivated curing system, is that the ultraviolet radiation of 350-400nm can realize curing by wave-length coverage.
The above only is some examples that how can obtain described characteristic, also has some can present other powder compositions of desirable characteristics.Can obtain can not covering the hyaline layer of basal surface after the curing by the polymer powder that does not contain pigment or other dyestuffs.If wish to obtain opaque layer for example milky, white, black or colour, then can add pigment or other dyestuffs.
Adopt additive also can control the gloss of coating surface.If additive can make above-mentioned essential characteristic, the possibility that low melting point and UV solidify changes, and so, must perhaps also will be paid attention to this when this method of design when forming this powder.
Polymer powder preferably composed as follows that is used for methods described herein:
The key component of this powder is the polyester of undersaturated amorphous of 50-＜100% or crystallization shape.In addition, preferably include curing agent so that the degree of cross linking that in solidification process, obtains to increase.The content of this curing agent is 15-50%, can be triacrylate, the vinyl esters of oligomer, the trihydroxyethyl-isocyanuric acid ester of aromatic polyurethane diacrylate, oligomer of acrylic compounds polyurethane (acrylo-urethane) etc.Need add light trigger in order to cause solidification process.The addition of this light trigger can be in the range of 1-3%.For clear varnish, preferably use 1-hydroxy-cyclohexyl ketone as light trigger, facing to the system of Chinese white; can adopt 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (2; 4,6-trimethylbensoyl-diphenylphosfonineoxide).Yet this only is as given example, may need diverse light trigger to specific purposes.Also imagination is added levelling agent.Advise that its consumption is 1-3%.For example can adopt acrylate as levelling agent.For example in order to make varnish smooth and, also can add many other additives for fear of the problems of bringing from object to be coated such as fume.
Be preferred for applying timber (clear varnish) and can provide good levelability as follows after the fusion at low temperatures with the basic recipe of the composition of good solvent resistance:
Unsaturated polyester (UP) 70-85%
Curing agent 15-30%
Light trigger 1-3%
Levelling agent 1-3%
In order to ensure unlikely damage wooden parts during fusion, the melt temperature of this powder should be at most 80-90 ℃.Fusion should or adopt the combination of IR and advection heat to finish by IR heat.This means that under so higher temperature melt stage there is no need to carry out, because IR can be heated to desired temperature with this wooden parts very soon in the long especially time.The time that can suppose a few minutes needs, and still, this depends on material to be coated fully.Some wood materials is highstrung to Fast Heating and can presents the strong degassing.This may mean and must adopt more slowly and more careful heating means.
Then be cured step after the fusion, referring to step V.How painted the situation of the light trigger of should be according to varnish and having added be cured under different UV wavelength.The UV spectrum that is in the low scope of 200-350nm is fit to, and supposition is adopted at the systemic light trigger of this scope thus.In the varnish of white, adopt the rutile titanium dioxide that can under above-mentioned wavelength, absorb.Therefore, must adopt the another kind of light trigger that these wavelength are reacted and do not absorbed by pigment.This just needs to use another kind of lamp.There are some to have lamp that maximum is 350-400nm and 400-450nm and the light trigger that under these two kinds of wide wavelength, absorbs in addition.Also can adopt many different modes that the powder coating that UV-solidifies is painted.Dividing separately under other situation, coloring pigment must adapt with suitable light trigger and lamp.
Adopt the lamp of these high brightness may mean that being easy to solidify thick coating also can improve solidification rate.Parts to be solidified needn't be placed on the focus, but on certain distance enough brightness should be arranged.This is remarkable especially when relating to clear varnish; Coloring system be the more important thing is that brightness should be high as far as possible.
Be more suitable in metallizing (clear varnish) and that metal is presented the basic recipe of adaptability and adhesive composition is as follows.Should under the too low situation of process temperature, not use.
Unsaturated polyester (UP) 80-＜100%
Curing agent 0-20%
Light trigger 1-3%
Levelling agent 1-3%
Above-mentioned preparation also can be painted.Must correspondingly use light trigger.
Foregoing about radiation and radiation data also be effective to a back prescription that provides basically.What should also be mentioned that is when relating to some composition, and light trigger can replace with other radiosensitive initiator systems.
The prescription that more than provides proposes and can change in disclosed wide range as just example, and they promptly can be used for described method by this way.Therefore, being used for powder composition of the present invention can be from some key component except that polyester, for example epoxy-, acrylate, polyurethane, melamine and other components.Also can adopt some different mixture of polymers.Step II: the preliminary treatment of object is so that keep in its surface powder
In this embodiment, adopt IIa: with object heating to be coated.The hear resistance of supposing object to be coated is limited; The typical case of this type objects is the object for example wood fibre board or the plastic object of wooden object, compacting.This type objects comprises the object of being made by reinforced plastics and/or added mass filler.Certain has the material of low heat resistant, and for example when relating to timber and most plastics, this fact means that also this material is non-conductive usually.Has the structural metal that some materials of high-fire resistance normally conduct electricity.Conventional powder coated assert that usually object has conductive surface, yet the present invention is not limited to this type objects, and also can advantageously be applied, and need not when relating to non-conductive surface to the acquisition conductive characteristic and carry out preliminary treatment.This makes this method valuable especially.Yet as mentioned above, this method also can advantageously be applied to for example cast iron object of solid body, the energy consumption that is used to heat with reduction.Can adopt diverse ways heating:, or, adopt the method that heats from the surface conductive that heats under special circumstances for example when relating to when only needing to apply single face dull and stereotyped by the thermal air current convection current, by infrared radiation.Shi Yong a kind of method is to heat simultaneously by the convection current of air stream with by the IR radiation especially.The IR radiation can be given its surperficial quick and darker heating that shines, and air stream can make temperature spread on the object surfaces very equably.This method even be applicable to has the very complicated and object when the IR radiation can not reach all surface zone of profile.Can think what heating was to carry out in the chamber of installing for this purpose in a device, at this place, object to be coated can be transported between expection will be carried out the different operating post of each step of this method.Explanation referring to this device.Step II I: the spraying of powder
In case heating is finished, immediately relevant object is transported to can dusty spray the position.Adopt spray gun, it can be arranged by the mode that powder strikes with surface to be coated, can realize spraying easily.Related to this is, can fill with electrostatic charge this powder then be easily if spray gun is assembled into.Know in advance, can adopt the charging device of high voltage drive, or make this powder charging by the wall friction made from the material that is suitable for this purpose in by the stroke of spray equipment at powder.Charging can make powder particle repel mutually, thereby forms the particle cloud that surrounds this object.
When cooperating between the melt temperature of the heating-up temperature that realizes above-mentioned object and powder, can make this particulate be ickiness, when it clashes into object attached to this object surfaces on.Like this, relevant object just obtains a kind of cover layer of uncured polymer base coating.Step IV: the melt temperature that is heated to powder
Clearly, this heating is carried out with the coating of powder.Replenish step: middle tempering
Still need at this moment and adopt the UV radiation to be cured in order to obtain the finish coating.Yet, can adjust the state of the viscous coating that has applied at least under certain conditions easily.This variation of this coating can be finished by changing temperature or cooling or heating.
In some cases, the coating that is part thawing, ickiness has a kind of danger, particularly heats continuously by the conduction of warmed-up object, reaches a kind of so mobile state so that can be created in the edge trickling of exposing and the danger that forms drop.Take place for fear of this situation, can cool off, thereby required temperature is reduced to formed coating and obtains the more temperature of solid state when making this powder particle of fusion.
On the other hand, make used powder reach the desired temperature of its fusion when inconvenient, take to spray in order to reduce viscosity that the method for back heating replaces may be valuable if this object is heated to.Like this, the powder particle that can make not fusion fully together fusion so that form uniform coating.If it is lower that the temperature on this object has kept, because it can not be subjected to higher temperature, so, the method for this follow-up heating must be carried out promptly in such a way, main, only on the coating after being to apply and not to the object heating below this layer.Therefore, this heating can be adopted and comprise that IR radiation and thermal air current carry out with the express method that brief process makes up easily.
In many cases, do not need this middle tempering basically, can omit this step in this case.Step V: solidify
As mentioned above, when relating to conventional powder coated, the polymerization of this dusty material takes place by heating in convection furnace as a rule.Therefore, when beginning to maintain this powder particle by electrostatic force, at first heating causes this material fusion.After this, be cured by the heating initiation.
This method is intended to manage to be implemented under such low temperature can not reach curing by heating, in any case or always needing considerable time after the initiation so that inexecutable process in industrial processes.
Therefore, must adopt another kind of method: adopt ultraviolet radiation to cause solidification method and realize solidifying.In step I, narrated how to prepare the dusty material that is used for this curing.
UV is solidificated in a kind of particularly suitable chamber and carries out, and after powder spraying and possible middle tempering, object is put into this chamber.In this chamber, disposed some UV radiators, the radiation of sending from this radiator should reach all surfaces that applied of this object.Have complicated shape and on many not coplanars, during cated object, may need special layout when relating to some.Therefore, may need to arrange the UV radiator of many aligning different directions, but also can do to replenish so that make this radiation change direction with some mirrors by new angle.Also can arrange to make the UV ray around relevant movement of objects like this.Perhaps, this object can be alternatively in the front of radiation source rotation or mobile.
When this radiation struck coating, the initiator system of this material can begin polymerization.Thereby may make to solidify carries out to such an extent that very fast-time may be less to 2 seconds.When relating to industrial processes, this weakness reason time relevant with the time of being heating and curing brings many advantages: workpiece passes through quickly on the one hand, may realize shortening the length of the required device of curing oven on the other hand.
Tempering is particularly cooled off and can be carried out simultaneously with the UV radiation in the middle of above-mentioned.By suitable cooling, can avoid in the solidification process because from warmed-up object with because the energy that the UV radiation is produced makes temperature reach very high value unfriendly.
After step V, it is that this object has obtained solidified coating that this method has ended at.Therefore, obtained all and powder coated advantages associated, promptly varnishing to compare with wet method to obtain thicker coating and the mechanical resistance of Geng Gao.This method is also very favourable to environment.This is because do not need to use solvent, and the powder that does not strike this object in the spraying step can be collected in the spray booth so that recycling.
Described a covering device in the accompanying drawings, each step of distinct methods can be undertaken by rational industrial process in this device.
Device shown in the figure has following structure: can be by overhead chain conveyor 3 with pending object 2 by passage 1, and the translator unit of this conveyer moves by from left to right direction in the accompanying drawing.In the accompanying drawing, this passage illustrates with the state of cutting open along vertical section.Therefore, it obviously is divided into 4 chambers, and each chamber is applicable to a step among the completing steps II-V: the step I of preparation powder is not included in this device, and this is can add use in this device at any time to because this powder of supposition has been the state for preparing.
At the beginning, there is one to be used for the chamber 5 that Step II heats.This chamber demonstrates infrared radiator 6 and makes up the import that adds hot-air 7 of unit from heating and ventilating.
What after this, follow is the chamber 9 that is used for spraying process.Some spray guns 10 that are connected with powder storage tank 13 by flexible pipe 12 in this chamber, have been inserted.As shown in the figure, these spray guns can be equipped with some nozzles 15.Adopt the compressed air-driven system that is not shown specifically, can deliver to corresponding spray gun 10 so that by nozzle 15 ejections from storage tank 13 absorption powder by flexible pipe 12.In this case, suppose the duct that in spray gun, has some to constitute, cause powder belt static by the friction between this cell walls and the powder by for example polytetrafluoroethylmaterial material.On the other hand, or additionally, the surface that this spray gun outfit high-pressure electric current can be able to be played the charging effect.
Back-tempering of carrying out is once in a while arranged to be used in next chamber 16.It has been equipped with the import 17 that adds hot-air or cooling air, also may be equipped with the IR radiator that is used for supplementary heating.If in relevant process, do not consider back-tempering, can omit this chamber so.
Remaining chamber 18 is applicable to step V, i.e. curing schedule.In this chamber, place some and be used for the radiator 19 of UV radiation.As mentioned above, also can there be some to be used to change mirror and some locular walls that can reflect easily of radiation direction.
For can make temperature keep constant or even can in this chamber, realize cooling off, assembled air intlet 22.This air part can be collected from the reflux pipeline 23 of this chamber, and another part can be collected from the import 24 from the air source with uniform temperature, and described temperature is equivalent to or is lower than the minimum temperature that supposition requires the cooling air that comes by import 22.If environment temperature is enough low, this air source can toe ring border air, or from the air of refrigeration machine.In addition, an outlet 25 from the air of outlet 26 is arranged in this chamber,, will all or part ofly use air to replace so from import 24 if air discharged is not exclusively returned and entered by import 22.By import 22 supply with return air with from the ratio of the fresh air of import 25 by thermostat controlled choke valve 27 controls, so that indoor temperature constant is remained under the temperature that is most appropriate to this method.
Usually, can not avoid hot accumulation in the coating procedure continuously, the result can cause the increase of heat and must be controlled, this is because the heating object of sending into is brought heat continuously into, simultaneously, since energy itself that can not avoid radiator 19 can give out certain wasted energy and UV radiation providing cause.Therefore, can adopt described cooling system to control.
When in described device, carrying out this method, object is suspended on successively on the translator unit of conveyer 3.Originally, this object is sent into successively this chamber 5.This conveyer moves with the length that is adapted to the treatment step required time, so that reach enough time of staying in corresponding chamber.This object is surrounded by the hot-air that adds by the ground air blast of opening 6 smooth flow in chamber 5, and is subjected to the IR radiation irradiation from ray 7.This just causes spreading on the body surface fully and heats, and makes it be enough to the heat that keeps next procedure required fully.
In chamber 9, carry out the step of next dusty spray.Obviously can understand from the above how this step is undertaken by spray gun 10.As for the position of these spray guns and the quantity of their design example such as nozzle, all must adapt usually with described object.In some cases, may need spray gun is hung in a movable manner, make them in spraying process, realize the spraying diameter that moves.
If desired, can in chamber 16, replenish tempering: or cool off so that stablize coating on the warmed-up object, or heating is so that make the coating that adheres on the object obtain better levelability.
At last, in chamber 18, adopt radiation initiation to be cured from UV radiator 19.Irradiation back or related to this is may need certain hardening time, chamber 18 can be prolonged promptly easily by this way, and when this object left this chamber, coating was stable.Therefore, this radiation appliance is distinguished to some extent along the extension of this chamber, for example the entrance point in this chamber adopts the radiation stronger than the port of export.
Method and apparatus as herein described is described with embodiment preferred.Yet other embodiments also can be included in the scope of appended claims.Mention by preamble, can adopt other known methods to keep being coated in the powder on this body surface and do not adopt method the object preheating.Relating under the situation with conductive surface object, can make powder adherence easily on object by electrostatic force, in the case, the fusion of the powder that this process is required can realize by back-heating, and will this object preheating.Therefore, this embodiment of this method is carried out according to specific key step fully: Step II c, the electrostatic charging of object or neutralization; Step II I, coating powders; Step IV is heated to the melt temperature of this powder; And step V, solidify.
Some diverse ways show that in the method for powder coated, the powder spraying is the most practical method, therefore, has selected this method in this preferred embodiment.
Therefore, this method and this powder composition can be in many actual requirement and types that are suitable for pending object and these used for object materials aspect different.Yet what all these embodiments were common is, with powder fusible under low temperature fusion in addition, forms polymeric layer thereby make on the surface of respective objects to be coated, after this is cured by radiation under the situation of the temperature that do not raise basically.Therefore, temperature is remained on and be significantly less than the temperature of previously continuing to use in the art.
Claims (10)
1. method that is used for powder coated, wherein, preliminary treatment is carried out on the surface of the object (2) that will carry out powder coated makes it can temporarily maintain powder, after this with this powder coated on this object, for example spraying can remain on the one deck on the object owing to described preliminary treatment, thereby by this powder of fusion and change solid state into by curing and make this powder on the body surface of powder coated, form coating, it is characterized in that, prepare this powder and be less than about 100 ℃ greatly so that it is had, preferred 60-100 ℃ than low melting glass and softening temperature, and it is characterized in that, polymeric material in this powder comprises be prepared for initiator system that this polymer is solidified under the effect of electromagnetic radiation, its feature also is, with like this preparation be coated in the temperature that is heated to its fusion by the powder on the pretreated object of described mode, but also be, this coating be exposed in radiation, thereby it is solidified into the coating that covers the powder coated surface thereafter.
2. according to the method for claim 1, it is characterized in that, the preliminary treatment on described object (2) surface comprises to this object surfaces layer of major general and is heated to such temperature, adheres on this object surfaces till being cured by radiation with activation thereby make the powder that is coated on this object reach fusion or soft state.
3. according to the method for claim 2, it is characterized in that, before powder coated, object (2) is heated to such temperature to cause this powder melts, on the whole surface of this object, form uniform coating, like this, it can be solidified into solid state.
4. according to the method for claim 2, it is characterized in that, do not adhering on this object surfaces under the situation of fusion fully to cause this powder before the powder coated object (2) being heated to such temperature, its feature also is, in subsequent step, this powder is heated, form uniform coating to cause its fusion, after this be cured.
5. according to the method for claim 1, it is characterized in that, it is that they can obtain electrostatic charge with dissimilar polarities each other that object (2) and this powder are carried out preliminary treatment by this way, be characterised in that preferred employing spraying process applies this powder, like this, it can remain on this object by static electrification, its feature also is, after this with this powder heating, make its fusion under described low temperature, be cured by radiation more thereafter.
6. according to each method in the aforementioned claim, it is characterized in that, after this powder reaches its melt temperature, this object is remained under such temperature, so that be no more than or preferably do not reach the melt temperature of this powder basically by tempering, simultaneously, be cured by radiation.
7. according to each method in the aforementioned claim, it is characterized in that, adopt ultraviolet ray to carry out radiation.
8. according to each the powder that is used for this method among the claim 1-7, it is characterized in that, form this powder so as to make its melt temperature that has be no more than 100 ℃ basically, preferably in 60-100 ℃ scope, its feature is that also this powder can solidify by electromagnetic radiation, preferred ultraviolet radiation.
9. powder according to Claim 8, it is characterized in that, this powder by at least a polymer as main component, be used to make this polymer by solidified by ultraviolet ray radiation photoinitiator system and form for the levelling agent that obtains described low melting glass.
10. according to the powder of claim 9, it is characterized in that this key component is unsaturated polyester (UP) preferably, it account for total amount 70% to about 100%, curing agent accounts for 30% at most, light trigger accounts for 1-3% and levelling agent accounts for 1-3%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE95027959 | 1995-08-10 | ||
| SE9502795A SE504784C2 (en) | 1995-08-10 | 1995-08-10 | Process for powder coating and powder for carrying out the process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1198108A true CN1198108A (en) | 1998-11-04 |
| CN1108197C CN1108197C (en) | 2003-05-14 |
Family
ID=20399150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96197273A Expired - Fee Related CN1108197C (en) | 1995-08-10 | 1996-08-09 | Method for powder coating and powder for use in said method |
Country Status (16)
| Country | Link |
|---|---|
| EP (1) | EP0846034B1 (en) |
| CN (1) | CN1108197C (en) |
| AT (1) | ATE197414T1 (en) |
| AU (1) | AU6711996A (en) |
| CA (1) | CA2229174A1 (en) |
| DE (1) | DE69610930T2 (en) |
| DK (1) | DK0846034T3 (en) |
| EE (1) | EE9800047A (en) |
| ES (1) | ES2154415T3 (en) |
| MX (1) | MX9801095A (en) |
| NO (1) | NO980547L (en) |
| PL (1) | PL182899B1 (en) |
| PT (1) | PT846034E (en) |
| RU (1) | RU2192315C2 (en) |
| SE (1) | SE504784C2 (en) |
| WO (1) | WO1997005963A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502071A (en) * | 2011-12-15 | 2012-06-20 | 青岛人民印刷有限公司 | Method for preventing dialysis of end face of liquid packaging paper material |
| CN103406247A (en) * | 2013-03-29 | 2013-11-27 | 北汽福田汽车股份有限公司 | Wear-resisting layer coating method |
| CN103962286A (en) * | 2014-05-07 | 2014-08-06 | 喜科金属（昆山）有限公司 | Automatic powder injection line production process |
| CN106413919A (en) * | 2013-11-28 | 2017-02-15 | 励泰科技有限公司 | Methods of powder coating and items to be powder coated |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5714206A (en) * | 1996-05-06 | 1998-02-03 | Morton International, Inc. | Two component powder coating system and method for coating wood therewith |
| EP0909222A4 (en) * | 1996-05-20 | 2004-09-08 | Ballina Pty Ltd | Method of coating and compositions for use therein |
| FR2762798B1 (en) * | 1997-05-02 | 1999-07-16 | Marie Therese Laurencot | METHOD FOR MANUFACTURING A LINEAR PROFILE TYPE ELEMENT COMPOSED OF A WOOD-METAL ASSOCIATION |
| US6017593A (en) * | 1998-03-31 | 2000-01-25 | Morton International, Inc. | Method for producing low gloss appearance with UV curable powder coatings |
| US6348242B1 (en) * | 2000-02-16 | 2002-02-19 | Morton International Inc. | Method for producing low/medium gloss appearance with UV curable powder coatings |
| CZ20033323A3 (en) | 2001-06-08 | 2004-06-16 | E.I. Du Pont De Nemours And Company | Low gloss free radical curable powder coating composition |
| MD2401G2 (en) * | 2003-06-27 | 2004-11-30 | Хелибрасас С.Р.Л. | Process for powdery coating of wooden articles |
| ES2445708T3 (en) | 2010-11-04 | 2014-03-04 | Siemens Aktiengesellschaft | Method of manufacturing a shovel |
| EP2722320A1 (en) | 2012-10-19 | 2014-04-23 | Diebald GmbH & Co. KG | Method for the electrostatic powder coating of a moulded concrete part and concrete composite material, comprising a moulded concrete part and a powder coating |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3211282A1 (en) * | 1982-03-26 | 1983-09-29 | August Dr.-Ing. 5430 Montabaur Albers | Process for coating glass articles |
| ES2109687T5 (en) * | 1993-04-01 | 2001-09-01 | Ppg Ind Ohio Inc | COMPOSITIONS AND METHODS OF OBTAINING COATINGS HARDENED BY RADIATION OF ELEVADA BRILLANTEZ. |
-
1995
- 1995-08-10 SE SE9502795A patent/SE504784C2/en unknown
-
1996
- 1996-08-09 EE EE9800047A patent/EE9800047A/en unknown
- 1996-08-09 PL PL96324925A patent/PL182899B1/en not_active IP Right Cessation
- 1996-08-09 DK DK96927229T patent/DK0846034T3/en active
- 1996-08-09 AU AU67119/96A patent/AU6711996A/en not_active Abandoned
- 1996-08-09 ES ES96927229T patent/ES2154415T3/en not_active Expired - Lifetime
- 1996-08-09 PT PT96927229T patent/PT846034E/en unknown
- 1996-08-09 EP EP96927229A patent/EP0846034B1/en not_active Revoked
- 1996-08-09 RU RU98103745/12A patent/RU2192315C2/en not_active IP Right Cessation
- 1996-08-09 CN CN96197273A patent/CN1108197C/en not_active Expired - Fee Related
- 1996-08-09 DE DE69610930T patent/DE69610930T2/en not_active Revoked
- 1996-08-09 WO PCT/SE1996/001003 patent/WO1997005963A1/en not_active Application Discontinuation
- 1996-08-09 AT AT96927229T patent/ATE197414T1/en not_active IP Right Cessation
- 1996-08-09 CA CA002229174A patent/CA2229174A1/en not_active Abandoned
-
1998
- 1998-02-09 MX MX9801095A patent/MX9801095A/en not_active IP Right Cessation
- 1998-02-09 NO NO980547A patent/NO980547L/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502071A (en) * | 2011-12-15 | 2012-06-20 | 青岛人民印刷有限公司 | Method for preventing dialysis of end face of liquid packaging paper material |
| CN103406247A (en) * | 2013-03-29 | 2013-11-27 | 北汽福田汽车股份有限公司 | Wear-resisting layer coating method |
| CN106413919A (en) * | 2013-11-28 | 2017-02-15 | 励泰科技有限公司 | Methods of powder coating and items to be powder coated |
| CN103962286A (en) * | 2014-05-07 | 2014-08-06 | 喜科金属（昆山）有限公司 | Automatic powder injection line production process |
Also Published As
| Publication number | Publication date |
|---|---|
| SE504784C2 (en) | 1997-04-21 |
| PL182899B1 (en) | 2002-03-29 |
| WO1997005963A1 (en) | 1997-02-20 |
| MX9801095A (en) | 1998-11-30 |
| EP0846034B1 (en) | 2000-11-08 |
| NO980547L (en) | 1998-04-02 |
| DE69610930T2 (en) | 2001-06-07 |
| DK0846034T3 (en) | 2001-03-05 |
| ATE197414T1 (en) | 2000-11-11 |
| EE9800047A (en) | 1998-08-17 |
| RU2192315C2 (en) | 2002-11-10 |
| CA2229174A1 (en) | 1997-02-20 |
| SE9502795D0 (en) | 1995-08-10 |
| AU6711996A (en) | 1997-03-05 |
| PT846034E (en) | 2001-04-30 |
| EP0846034A1 (en) | 1998-06-10 |
| NO980547D0 (en) | 1998-02-09 |
| CN1108197C (en) | 2003-05-14 |
| ES2154415T3 (en) | 2001-04-01 |
| SE9502795L (en) | 1997-02-11 |
| DE69610930D1 (en) | 2000-12-14 |
| PL324925A1 (en) | 1998-06-22 |
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