WO2013139851A1 - Procédé et dispositif de production de couches de peinture durcies - Google Patents

Procédé et dispositif de production de couches de peinture durcies Download PDF

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Publication number
WO2013139851A1
WO2013139851A1 PCT/EP2013/055808 EP2013055808W WO2013139851A1 WO 2013139851 A1 WO2013139851 A1 WO 2013139851A1 EP 2013055808 W EP2013055808 W EP 2013055808W WO 2013139851 A1 WO2013139851 A1 WO 2013139851A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating composition
radiation
needle
electromagnetic radiation
spray gun
Prior art date
Application number
PCT/EP2013/055808
Other languages
German (de)
English (en)
Inventor
Wolfgang Schrof
Thomas Meier
Christian Michael Jung
Antoine Carroy
Werner-Alfons Jung
Peter Hoffmann
Tobias Hintermann
Caroline Lordelot
Olof Wallquist
Original Assignee
Basf Se
Basf Schweiz Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Basf Se, Basf Schweiz Ag filed Critical Basf Se
Priority to CN201380015763.7A priority Critical patent/CN104203425A/zh
Priority to EP13710436.0A priority patent/EP2828001A1/fr
Priority to JP2015500908A priority patent/JP2015512331A/ja
Publication of WO2013139851A1 publication Critical patent/WO2013139851A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B05B7/067—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the liquid outlet being annular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B05B7/068—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the annular gas outlet being supplied by a gas conduit having an axially concave curved internal surface just upstream said outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2435—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle the carried liquid and the main stream of atomising fluid being brought together by parallel conduits placed one inside the other
    • 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
    • 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
    • B05D1/34—Applying different liquids or other fluent materials simultaneously
    • 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

Definitions

  • the present invention relates to a method and an apparatus for producing hardened lacquer layers on a substrate surface.
  • Conventional spray guns are generally constructed so that from a reservoir, the paint is conveyed into the spray gun, passed through the latter in an annular gap-shaped channel along a needle and at the nozzle formed by the needle tip and mantle by a
  • Spray air Gas, inert gas or compressed air stream
  • gas, inert gas or compressed air stream is distributed. It is possible to further shape the spray cone by means of a gas metering in addition to the nozzle, for example with the aid of so-called horn air.
  • Airless atomizing spraying methods are also known in which the coating composition, in contrast to air atomization, is atomized by the material pressure alone, for this purpose the coating composition is pressed under pressure through a nozzle bore which divides the material into a spray jet.
  • a paint is merely applied to a substrate with a spray gun, the curing then takes place after application in a separate step, for example by baking the paint or radiation curing.
  • US 3133828 describes a method for applying a coating to large substrates, for example car bodies, in which the coating composition is activated before application to the substrate.
  • the disadvantage is that the device is stationary and can not be easily downsized.
  • JP 61-098740, JP 07-227567, EP 393407 and JP 2007-083166A describe the general possibility of exposing paint before passing through a spray gun, without disclosing details on the type and location of the exposure.
  • DE 19961990 describes a method for forming a component in which a mass to be hardened is pressed into a mold and the curing is previously initiated.
  • DE 3702999 describes the curing of UV reaction resin compositions by the mass is passed through a channel which is exposed either from the outside (there Figure 1) or from behind (there Figure 2) through a light guide.
  • the resin compounds are used for bonding.
  • the UV reaction resins described here are only curable under the specified conditions, because the residence time in the exposure system is relatively long. Due to the low exposure intensity of commercial systems, only low volume flows are possible.
  • a disadvantage of the last variant is that UV radiation can also penetrate outward along the channel. This can cause additional expense for UV protection measures or lead to unwanted hardened deposits at the end of the channel. Furthermore, in the examples explicitly disclosed, exposure times of 5 or 10 seconds are disclosed, which is the case there disclosed systems of exposure device and coating composition for spray guns unsuitable. In addition, a distribution of the adhesive resin compositions by spraying is not provided and due to the high viscosity of such resin compositions also not possible. From EP 1002587 A it is known to expose radiation-curable lacquers in a spray gun and thus to harden the applied lacquer during application to the substrate or to initiate the curing.
  • the disadvantage is that must be protected from the UV radiation by the external exposure of the painter. Furthermore, the spray gun becomes unwieldy due to the irradiation unit attached to the mouth. In addition, the large-area UV exposure of a droplet mist is costly and results in an inhomogeneous irradiation of the substrate.
  • the object of the present invention was therefore to develop a mobile spray gun with which radiation curing can be initiated without the surgeon having to be protected from radiation.
  • Commercially available spray guns should be slightly modified in a simple form.
  • the optional at least one supply channel 3 for a gas and the at least one supply channel 2 are arranged such that the at least one radiation-curable coating mass led from the at least one feed channel 2 through the mouth 13 is atomized by the gas from the optional at least one feed channel 3 or the at least one radiation-curable coating composition is nebulized by physical forces in the absence of the optional supply channel 3,
  • the needle 1 is designed such that it is permeable to electromagnetic radiation. is sig, with the curing of the at least one radiation-curable coating composition can be initiated and / or
  • the supply line 12 is designed to be transparent to electromagnetic radiation and a lighting unit 10 is attached to the supply line 12.
  • the electromagnetic radiation transmissive needle 1 is preferably made to have the same diameter and the same tip geometry as the original conventional needle. If desired, the tip geometry can be easily modified, for example, the cone angle changed or incorporated in the tip of one or more shoulders or throats. Otherwise, the dimensions of the needle 1 and the needle tip are based on those of the original needle.
  • the diameter of the needle (referred to as e in FIG. 1) may preferably be from about 0.5 to 10, more preferably 2 to 5 mm. In individual cases, smaller diameters are possible. It is essential to the invention that the needle 1 is made of a material which is permeable to electromagnetic radiation in the wavelength range which is required in order to initiate hardening in the at least one radiation-curable coating composition.
  • Such materials may be, for example, quartz, polymethyl methacrylate (Plexiglas®) or other transparent plastics, for example polycarbonate (PC), polyethylene (PE), polypropylene (PP), sapphire glass, calcite, glass, as well as hollow bodies with transparent input and output surfaces, preferred material is quartz.
  • PC polycarbonate
  • PE polyethylene
  • PP polypropylene
  • sapphire glass sapphire glass
  • calcite glass
  • glass as well as hollow bodies with transparent input and output surfaces
  • preferred material is quartz.
  • UV light there should be significant transparency for the wavelength range below 450 nm. It is usually and preferably sufficient if only the surface of the needle 1 at the tip, referred to as 6 in FIG. 1, is made permeable to electromagnetic radiation.
  • the distance f in FIG. 1 is exposed and is available for activation of the photoinitiator I in the at least one coating mass.
  • the length of the distance f is preferably between 1 and 30 mm, more preferably between 2 and 20 and most preferably between 4 and 15 mm. It represents a preferred embodiment of the present invention, when the surface 7 opposite the surface 6 in the feed channel 2 is reflective along the exposure distance f for the applied radiation. This causes an improved utilization of the electromagnetic radiation.
  • the body of the needle that is transparent to the applied radiation acts as a radiation conductor. It therefore brings no additional advantage, although the lateral surface of the cylindrical portion of the needle 1, referred to in Figure 1 as 5, is permeable to electromagnetic radiation. This usually has disadvantages as regions with very low material flow are exposed and harden within the gun.
  • the needle 1 is connected at the back to a lighting unit (not shown in FIG. 1) which emits electromagnetic radiation, at least in the desired wavelength range, effectively into the radiation conductor of the needle.
  • the illumination unit can be attached directly to the needle 1 or preferably connected to it, particularly preferably by a light guide.
  • Suitable lighting units are e.g. Mercury low pressure lamps,
  • the radiation curing is effected by the action of high-energy radiation, ie IR, NIR, UV radiation or daylight, preferably UV radiation.
  • the desired wavelength range ⁇ which the illumination unit emits, must include the wavelength range with which the radiation curing is to be carried out. This wavelength range should preferably include the absorption spectrum and particularly preferably the activation spectrum of the at least one photoinitiator I (see below) used in the coating composition.
  • the desired wavelength range may comprise 200 to 2500 nm, preferably 200 to 2000, more preferably 200 to 1500, most preferably 200 to 1000, especially 200 to 780 nm, especially 340 to 500 nm.
  • the introduced radiation dose should preferably be in the range of 80 to 30,000 mJ / cm 2 in the case of UV curing.
  • the illumination unit is one or more LEDs emitting in the UV region, particularly preferably LEDs or LED systems which emit UV light in the wavelength range from 365 to 450 nm.
  • a plurality of illumination units preferably LEDs used, for example, 2 to 100, preferably 2 to 50, more preferably 3 to 25 and most preferably 3 to 16, it may be necessary the irradiated diameter of the illumination unit to the Adjust diameter of the needle 1, this is preferably done by adaptation unit or converging lens.
  • LEDs It is a particular advantage of LEDs that they can be attached directly to the needle or the body of the spray gun due to their small size and need not be connected via a light guide to the needle 1.
  • the needle 1 is designed to be movable longitudinally, so that they close the at least one feed channel 2 for the at least one coating mass by movement against the mouth 13 with the diameter d and so regulate and prevent the spraying of the coating composition. It is understood that for closing the mouth 13, the diameter e must be greater than d, in particular in the region of the mouth 13th
  • the feed channel 2 is arranged around the needle 1 in the form of an annular gap, but the exact arrangement of the feed channel 2 is not essential to the invention; other arrangements of the feed channel 2 are conceivable, which can have the same effect.
  • the width of the feed channel 2 between needle 1 and wall 4 is designated by a in FIG. 1 and may be from 0.05 to 5 mm, preferably from 0.1 to 1.5 mm and more preferably from 0.1 to 1 mm.
  • At least one spray gas is supplied to at least one further feed channel 3 on the side of the mouth 13 facing away from the needle 1, under the influence of which the at least one coating composition is atomized.
  • the at least one feed channel 3 is present and is guided by this spray gas.
  • the supply channel 3 is arranged in the form of an annular gap around the jet of the at least one coating mass emerging from the orifice 13, but the exact arrangement of the feed channel 3 is not essential to the invention; other arrangements of the feed channel 3 are conceivable which can have the same effect.
  • the width of the feed channel 3 is designated b in FIG. 1 and may be from 0.1 to 5 mm, preferably from 0.2 to 4 mm and particularly preferably from 0.3 to 3 mm.
  • the at least one gas which is conducted through the feed channel 3 is preferably air, but it is also conceivable to use another gas, for example an inert gas such as nitrogen or carbon dioxide.
  • the at least one gas which is passed through the feed channel 3 is usually fed via a line from a supply outside the spray gun, preferably in a compressed form, into the feed channel 3.
  • the at least one gas is conveyed with an overpressure against the atmosphere of up to 5 bar, preferably up to 3 bar, particularly preferably 2 bar, into the spray gun.
  • the two supply channels 2 and 3 are separated by a wall 4 from each other.
  • the design of the nozzle 14 with the width c is not critical to the invention, the effect is crucial for the atomization of the at least one coating composition in such a way that the coating composition can be applied in the desired manner to the substrate.
  • the at least one radiation-curable coating composition which is guided through the feed channel 2, can optionally be conducted via a line from a supply outside the spray gun into the feed channel 2 or else via a reservoir 11 directly connected to the spray gun. In both cases, it is possible to design the supply line 12 from the external supply or from the reservoir 11 to the supply channel 2 over a distance h transparent to electromagnetic radiation, so that 10 more electromagnetic radiation can be introduced into the at least one coating composition via a lighting unit.
  • the lighting unit 10 with one-sided, two-sided or arranged around the feed line 12 exposure can be mounted or plugged eg as a flat intermediate piece between storage tank and actual spray gun.
  • This intermediate piece can be injection-molded or cast, for example, from transparent polymer and can be made interchangeable because of possible caking or degradation of the transparent material.
  • Such an intermediate piece may have different diameters i in order to allow a sufficient penetration depth of the electromagnetic radiation into the irradiation chamber for starting the hardening. hardenable coating composition depending on different photoinitiators and different concentration of photoinitiators or to allow different volume flows.
  • the illuminated surface of the lighting unit can be different in size, so that different numbers of light sources such as LEDs can be mounted.
  • a further embodiment comprises as a supply line 12 a hose with interchangeable, preferably plane-parallel transparent windows, preferably made of a transparent injection-molded plastic, to which the LEDs are plugged. This allows the easy replacement of the windows during gluing with reuse of the LEDs.
  • the supply line 12 may thus be a few millimeters to several meters long and the illuminated route h therein may include part of this route up to the entire route 12.
  • static mixers mounted in the illuminated section can homogenize the residence time of the coating compositions near the edge zones with higher exposure intensities and avoid that unexposed volume elements are splashed and later cause uncoated coating areas.
  • the illumination unit 10 can preferably emit in the same wavelength range as the electromagnetic radiation guided through the needle 1. However, it is also conceivable to irradiate in a different wavelength range, provided that the at least one coating composition contains a photoinitiator I which can be activated in this other wavelength range.
  • the two embodiments of the present invention exposure by the needle 1 and / or exposure between the reservoir 11 and the spray gun
  • the exposure between reservoir 11 and spray gun optionally supplemented by an exposure by the needle. 1
  • At least one further illumination unit 8 may be mounted so that it irradiates the supply channel 2 from outside to inside.
  • the wall 4 is provided in the region of the illumination unit 8 with a transparent window 9 of length g, which is permeable in the wavelength range relevant to the photoinitiator for the electromagnetic radiation emitted by the illumination unit 8.
  • the channel form for the coating mass can be made large and thin.
  • the feed channel 12 can be divided into thin individual channels, which are each irradiated.
  • the channel 2 can be made thin-layered.
  • the illumination unit 8 can preferably emit in the same wavelength range as the electromagnetic radiation guided through the needle 1. However, it is also conceivable to irradiate in a different wavelength range, provided that the at least one coating composition contains a photoinitiator I which can be activated in this other wavelength range.
  • the at least one coating composition for example one to three, preferably one to two and particularly preferably exactly one coating composition, are those coating compositions whose curing can be carried out or at least initiated by electromagnetic radiation.
  • curing is meant a polymerization of low molecular weight components contained in the coating composition to form high molecular weight compounds. This may preferably be a free-radical polymerization or a polycondensation.
  • the coating composition may be those coating compositions which comprise activated ethylenically unsaturated double bonds and at least one photoinitiator I which can be activated by the irradiated electromagnetic radiation, so that free-radical radicals are formed Start polymerization.
  • the activated ethylenically unsaturated double bonds are preferably selected from the group consisting of acrylate groups, methacrylate groups and vinyl ether groups, more preferably selected from the group consisting of acrylate groups and methacrylate groups.
  • the coating compositions may advantageously be those described in WO 2005/1 19208 A1, page 5, line 7 to page 7, line 21 (corresponding to US 2008/0032037 A1, paragraphs [0033] to [0046 ]), which is hereby expressly incorporated herein by reference.
  • the photoinitiators I contained therein for activating the coating composition can be activatable, for example, by UV, IR and / or NIR radiation and / or daylight, preferably by UV and / or IR radiation and / or daylight, particularly preferably by
  • UV radiation Such photoinitiators which can be activated by UV radiation are known, for example, from WO 2005/1 19208 A1, page 7, line 23 to page 9, line 10 (corresponds to US 2008/0032037 A1, paragraphs [0047] to [0059]), which hereby is expressly incorporated herein by reference.
  • NIR or IR radiation photoinitiators are known for example from WO 2005/085372 A1, page 3, line 24 to page 5, line 18 (corresponds
  • a UV and an NIR-activatable photoinitiator can be used in combination or else two UV-activatable photoinitiators, if they can be activated by sufficiently different wavelength ranges.
  • the coating composition is two-component polyurethane coating compositions whose polycondensation is triggered by a Lewis acid which is released by irradiation of electromagnetic radiation.
  • the two-component polyurethane coating compositions are preferably coating compositions which contain at least one polyisocyanate and at least one binder.
  • the binders may be, for example, polyacrylate polyols, polyester polyols, polyether polyols, polyurethane polyols; polyurea; Polyesterpolyacrylatpolyole; Polyester polyurethane polyols; Polyurethane polyacrylate polyols, polyurethane modified alkyd resins; Fatty acid-modified polyester polyurethane polyols, copolymers with allyl ethers, graft polymers of the substance groups mentioned with, for example, different glass transition temperatures, as well as mixtures of said binders. Preference is given to polyacrylate polyols, polyester polyols and polyurethane polyols.
  • binders may have an acid number according to DIN EN ISO 3682 (potentiometric) to 200 mg KOH / g, preferably up to 150 and particularly preferably up to 100 mg KOH / g.
  • Particularly preferred binders are polyacrylate polyols and polyesterols.
  • Such coating compositions are described, for example, in WO 2009/0501 15 A1, page 30, line 22 to page 33, line 20, which is hereby expressly incorporated by reference into the present disclosure.
  • Lewis acids released by electromagnetic radiation are known.
  • optically induced long dark reaction polymerizations e.g. 2K or cationic reactions for pigmented coatings.
  • Long means that the time to a sudden increase in the viscosity of the coating composition, as a result of which the coating composition in the spray gun is no longer processable, is preferably ten times longer than the residence time of the coating composition within the spray gun, calculated from the time of exposure to Leaving the nozzle 14.
  • the layer thickness of the coating compositions at the locations of the illumination units 6, 8 and / or 10 during the exposure preferably less than 1 mm, particularly preferably less than 100 ⁇ m or very particularly preferably less than 10 ⁇ m. It is possible to use a single Lewis acid as photoinitiator I in the coating composition or a combination of several Lewis acid as photoinitiators. The latter is particularly preferred when in the device according to the invention the irradiation of the electromagnetic radiation takes place via the needle 1 and via the optional illumination units 8 and / or 10 in different wavelength ranges.
  • a UV and an NIR-activatable photoinitiator can be used in combination or else two UV-activatable photoinitiators, if they can be activated by sufficiently different wavelength ranges.
  • typical additives in the coating compositions for example, antioxidants, oxidation inhibitors, stabilizers, activators (accelerators), dyes, degassing agents, brighteners, antistatic agents, flame retardants, thickeners, thixotropic agents, flow control agents, binders, antifoams, fragrances, surface-active agents, viscosity modifiers, plasticizers Plasticizer, tackifier, chelating agent or compatibilizer.
  • Pigmented coating compositions can also be used. This is particularly conceivable if the pigment is at least partially transparent to the incident and the photoinitiator I activating electromagnetic wavelength range. This is often the case for IR or NIR activatable photoinitiators. But also in this wavelength range absorbing, pigmented coating compositions can be activated in the spray gun according to the invention, when the quantum yield of the photoinitiators within the spray gun is sufficiently high. This can be further assisted by the attachment of static mixers, which circulates the coating composition in the exposed sections, thereby increasing the imageable layer thickness.
  • the coating composition to be applied has a viscosity that allows applicability by means of a spray gun.
  • This application viscosity can be achieved by adding solvent to the desired viscosity.
  • the viscosity of the radiation-curable coating composition should be from 10 to 10 000 mPas, preferably 10 to 1000 mPas at 25 ° C.
  • the illumination within the spray gun electromagnetic radiation does not penetrate or at least only slightly outward, but is almost completely absorbed within the gun, it can be waived labor protection of the painter against UV radiation.
  • the introduced dose of the electromagnetic radiation within the coating compound can be increased by providing the surfaces opposite the illumination units in a reflective manner.
  • the lighting units 8 and 10 are preferably also provided with housings 15, so that electromagnetic radiation can not escape to the outside.
  • the present invention represents a further development compared to the prior art in that it is now possible to initiate a polycondensation in two-component polyurethane coating compositions with the last-mentioned Lewis acids, Although the exposure in the spray gun according to the invention takes place only on the short distance f, or g or h, in which the coating composition of the electromagnetic radiation is exposed to significantly less than 1 second.
  • the residence time can be in the range of seconds. This is surprising in that in the prior art
  • Another object of the present invention is a method for applying a coating composition to a substrate by means of a spray gun, wherein the spray gun is a spray gun according to the invention and the coating composition is those coating compositions whose curing is carried out by electromagnetic radiation or can be initiated at least, preferably to two-component polyurethane coating compositions whose polycondensation is triggered by a Lewis acid, which is released by irradiation of electromagnetic radiation.
  • Another object of the present invention is the use of the spray gun according to the invention for applying such coating compositions to a substrate whose curing can be performed by electromagnetic radiation or at least initiated, preferably two-component polyurethane coating compositions whose polycondensation is triggered by a Lewis acid, by irradiation electromagnetic radiation is released.
  • the inventive method is suitable for coating substrates such as wood, wood veneer, paper, cardboard, textile, film, leather, nonwoven, plastic surfaces, glass, ceramics, mineral building materials, such as cement blocks and fiber cement boards or metals, each optionally optionally precoated or pretreated, preferably of wood, plastics and metals and more preferably of plastics and metals.
  • substrates such as wood, wood veneer, paper, cardboard, textile, film, leather, nonwoven, plastic surfaces, glass, ceramics, mineral building materials, such as cement blocks and fiber cement boards or metals, each optionally optionally precoated or pretreated, preferably of wood, plastics and metals and more preferably of plastics and metals.
  • the process according to the invention is particularly suitable for coating automobiles, (large) vehicles, aircraft, industrial applications, commercial vehicles in the agricultural and construction sectors, paint finishes, bridges, buildings, electricity pylons, tanks, containers, pipelines, power plants, chemical plants, ships , Cranes, piles, sheet piling, fittings, pipes, fittings, flanges, couplings, halls, roofs and structural steel, furniture, Windows, doors, parquet, particularly preferred is the coating of automobiles, (large) vehicles, aircraft and commercial vehicles, very particularly preferably of automobiles and in particular in refinish application.
  • Reference symbol in FIG. 1 Reference symbol in FIG. 1

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Nozzles (AREA)
  • Coating Apparatus (AREA)

Abstract

Le but de la présente invention est un pistolet pulvérisateur mobile avec lequel un durcissement par rayonnement peut être induit sans que l'opérateur doive être protégé du rayonnement. Ce but est atteint par un pistolet pulvérisateur mobile comprenant un canal d'amenée (2) pour une matière de revêtement pouvant être durcie par rayonnement, une aiguille (1) mobile dans la direction longitudinale avec laquelle le canal d'amenée (2), qui forme une fente annulaire autour de l'aiguille (1), peut être obturé contre l'embouchure (13) du canal d'amenée (2), l'aiguille (1) étant conçue de manière à être perméable au rayonnement électromagnétique avec lequel un durcissement de la matière de revêtement pouvant être durcie par rayonnement peut être induit et/ou la conduite d'alimentation (12) est conçue transparente pour le rayonnement électromagnétique et une unité d'éclairage (10) est appliquée sur la conduite d'alimentation (12).
PCT/EP2013/055808 2012-03-22 2013-03-20 Procédé et dispositif de production de couches de peinture durcies WO2013139851A1 (fr)

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CN201380015763.7A CN104203425A (zh) 2012-03-22 2013-03-20 用于制备固化涂层的方法和设备
EP13710436.0A EP2828001A1 (fr) 2012-03-22 2013-03-20 Procédé et dispositif de production de couches de peinture durcies
JP2015500908A JP2015512331A (ja) 2012-03-22 2013-03-20 硬化塗膜の製造方法及び製造装置

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EP12160781.6 2012-03-22

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US10180248B2 (en) 2015-09-02 2019-01-15 ProPhotonix Limited LED lamp with sensing capabilities

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DE102018003345A1 (de) * 2018-04-23 2019-10-24 Kienle + Spiess Gmbh Verfahren zur Herstellung von Lamellenpaketen sowie Auftrageinrichtung für ein Klebemittel zur Durchführung des Verfahrens
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US10180248B2 (en) 2015-09-02 2019-01-15 ProPhotonix Limited LED lamp with sensing capabilities

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