EP1625891B1 - Luftloses Spritzverfahren einer wässrigen Beschichtungszusammensetzung hoher Viskosität - Google Patents

Luftloses Spritzverfahren einer wässrigen Beschichtungszusammensetzung hoher Viskosität Download PDF

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Publication number
EP1625891B1
EP1625891B1 EP05076856.3A EP05076856A EP1625891B1 EP 1625891 B1 EP1625891 B1 EP 1625891B1 EP 05076856 A EP05076856 A EP 05076856A EP 1625891 B1 EP1625891 B1 EP 1625891B1
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Prior art keywords
composition
outlet orifice
orifice
coating
process according
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English (en)
French (fr)
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EP1625891A2 (de
EP1625891A3 (de
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Saturnino Insausti-Eciolaza
Renos Mouzouras
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Akzo Nobel Coatings International BV
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Akzo Nobel Coatings International BV
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Priority claimed from EP04380170A external-priority patent/EP1627689A1/de
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Priority to EP05076856.3A priority Critical patent/EP1625891B1/de
Priority to PL05076856T priority patent/PL1625891T3/pl
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    • 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
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
    • 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

Definitions

  • This invention relates to a process for the airless spray-coating of a surface with a viscous aqueous architectural coating composition (such as a woodstain, paint, lacquer or varnish) being a process able to cope with non-Newtonian flow if necessary at pressures of up to 5 bar, these being pressures achievable from simple hand pumps.
  • a viscous aqueous architectural coating composition such as a woodstain, paint, lacquer or varnish
  • the significance of non-Newtonian flow is that it complicates low pressure spraying.
  • the significance of hand pumps (or more correctly "hand-operated compressors" is that they are suitable for use by amateur (ie. do-it-yourself) users who are usually unsophisticated and therefore unlikely to have the skill or will to invest in the sophisticated types of expensive high pressure spraying apparatus currently used to spray viscous aqueous compositions in industry.
  • An "airless" spray-coating process is a process which does not require an accompanying stream of air to assist its atom
  • Architectural coating compositions are designed for application to surfaces found in or as part of buildings such as walls, ceilings, window frames, doors and door frames, radiators and customised furniture. They can also be supplied for application to surfaces related to buildings which surfaces are found in land (eg. gardens and yards) surrounding buildings. Such related surfaces include the stone or concrete surfaces of walls and the planed or rough cut wooden surfaces of fences, gates and sheds.
  • Architectural coatings are intended to be applied on site at ambient temperatures and humidity by either amateur and/or professional painters. Ambient temperatures are typically from 5 to 45°C.
  • Aqueous architectural coating compositions are often called “latex” or “emulsion” paints if they contain significant amounts (eg. more than 7 wt %) of solid materials.
  • Aqueous architectural coating compositions comprise an organic film-forming binder polymer which firstly serves to bind a dried coat of the composition to a surface to which it has been applied and secondly serves to bind any other ingredients of the composition such as pigments, dyes, opacifiers, extenders and biocides into the dried coat.
  • the binder polymer is a significant cause of non-Newtonian flow.
  • a wide variety of conventional film-forming binder polymers are available for use in architectural coating compositions, but those most commonly used are of three broad types obtained from mono-ethylenically unsaturated monomers and known colloquially as "acrylics", "vinyls” or “styrenics”.
  • the "acrylics” are usually copolymers of at least two alkyl esters of one or more mono-ethylenically unsaturated carboxylic acids (e.g.
  • methyl methacrylate/butyl acrylate copolymer whilst the "vinyls” usually comprise copolymers of a mono-vinyl ester of a saturated carboxylic acid such as vinyl acetate and at least one of either an acrylic monomer or a different mono-vinyl ester, often the vinyl ester of a carboxylic acid containing 10 to 12 carbon atoms such as those sold under the trade name "Versatate” by Resolution Europe BV of Rotterdam.
  • the “styrenics” are copolymers containing styrene (or a similar mono-vinyl aromatic monomer) together with a copolymerisable monomer which is usually an acrylic.
  • suitable aqueous binder polymers is given in the third edition of an "Introduction to Paint Chemistry" by G P A Turner, published in 1967 by Chapman and Hall of London , the contents of which are herein incorporated by reference.
  • Non-associative thickeners are water soluble (or at least water-swellable) polymers which increase viscosity mainly by overlap and/or entanglement of their polymer chains and/or by their occupation of large volumes of space within the coating composition. These affects are promoted by the molecular weight, stiffness and straightness of their polymer chains. Associative thickeners are also water-soluble (or at least water-swellable) polymers. They have chemically attached hydrophobic groups that are capable of self-association into micellar-like assemblies as well as non-specific adsorption onto all colloidal surfaces present. This behaviour is similar to that of conventional surfactants. It results in a transient network of polymer chains which increase the Brookfield viscosity of coating compositions.
  • cellulosics comprise straight and stiff polymeric backbones making cellulosics exceptionally effective in increasing the viscosity of aqueous systems.
  • Chain length is defined in terms of weight average molecular weights as derived from viscosity measurements.
  • cellulosics include hydroxyethyl cellulose, methyl cellulose, hydroxypropylmethyl cellulose and ethylhydroxyethyl cellulose.
  • Long chain (eg. molecular weights above 250 000 Da) and medium chain (eg. 100 000 to 250 000 Da) cellulosics increase viscosity by chain entanglement which enables high Brookfield viscosities to be achieved at low concentrations.
  • concentrations of cellulosics have to be increased to achieve the high shear viscosities needed for high film build, they will also impart unwanted high elasticity to the coating composition contributing to poor atomisation during spraying and a subsequent inhibition of the levelling of the freshly applied coating.
  • Short chain cellulosics eg. molecular weights below 100 000 Da
  • concentration affects eg. occupation of volume
  • Such high concentrations are expensive to use and they significantly harm the water-resistance of the applied coating when dry.
  • Associative thickeners overcome the shortcomings of cellulosics.
  • the transient networks they create produce increases in Brookfield viscosity comparable with those achievable with high molecular weight cellulosics. This allows them to be used in relatively small concentrations which do not seriously detract from the water-resistance of the dried coating.
  • associative thickeners are relatively low in molecular weight and so they do not form the entanglements which give the unwanted high elasticity which hinders spraying and levelling.
  • HASE hydrophobically modified alkali soluble emulsion
  • Commercial examples of HASEs have hydrophilic backbones comprising salts of polymerised or copolymerised unsaturated carboxylic acids or acid anhydrides such as acrylic or methacrylic acids or maleic anhydride.
  • Hydrophilic moieties such as polyalkylene glycols (eg. polyethylene glycol) are attached to the hydrophilic backbones and hydrophobic groups are in turn are attached to the hydrophilic moieties.
  • solutions of these HASEs are added as free-flowing liquids to a coating composition at neutral or slightly acidic pH.
  • An increase in Brookfield viscosity is then caused by raising the pH to mildly alkaline conditions whereupon carboxylate anions are formed.
  • the second type of associative thickener is the hydrophobicly modified hydroxy alkyl (especially ethyl) cellulosic or "HMHEC” type conveniently made by the addition of long chain alkyl epoxides to hydroxyalkyl celluloses of the type used as non-associative thickeners.
  • HHEC hydrophobicly modified hydroxy alkyl
  • the third type of associative thickener is the block/condensation copolymer "HEUR" type comprising hydrophilic blocks and hydrophobic blocks usually terminating in hydrophobic groups.
  • the hydrophilic blocks may be provided by polyalkylene oxide (especially polyethylene oxide) moieties of relatively low molecular weight of say below 10 000 Da, preferably 3 400 to 8 000 Da.
  • the hydrophilic blocks are condensed with for example hydrophobic urethane-forming di-isocyanates such as toluene di-isocyanate.
  • the fourth type of associative thickener is the hydrophobicly modified polyacrylamide type in which the hydrophobic groups are incorporated as free radical copolymers with N-alkyl acrylamides. These are most useful in acidic coating compositions.
  • HEURASE hydrophobicly modified ethoxylated oxide urethane alkali-swellable emulsion
  • Inexpensive low pressure spraying apparatus which can be pressurised up to about 3 bar using a hand-operated compressor is widely used by amateurs (especially gardeners) for spraying organic solvent-based liquids such as woodstains, fungicides and insecticides. These compositions are simple to spray because they have negligible Brookfield viscosity and contain low or zero contents of solid material. Often a low Brookfield viscosity is essential if these liquids are required to soak into wood or flow into inaccessible parts of vegetation.
  • the spraying apparatus be capable of spraying large volumes per minute of the aqueous architectural coating composition. It is preferred that a volume velocity of at least 0.2 (preferably 0.3 to 0.7) litre/minute of composition be delivered to a target surface at the preferred distance of about 300mm otherwise the target surface can only be traversed slowly.
  • this invention provides a process for the airless spray-coating of a surface with a viscous aqueous non-Newtonian architectural coating composition
  • a viscous aqueous non-Newtonian architectural coating composition comprising a binder polymer and ingredients chosen from pigments, dyes, opacifiers and extenders which composition is suitable for coating vertical surfaces
  • This invention also provides a process for the airless spray-coating of a surface with a viscous aqueous non-Newtonian architectural coating composition
  • a viscous aqueous non-Newtonian architectural coating composition comprising a binder polymer and ingredients chosen from pigments, dyes, opacifiers and extenders which composition is suitable for coating vertical surfaces
  • the nozzle defines an outlet orifice in the form of a slot where the slot extends transversely of the flow of the composition through the nozzle.
  • the outlet orifice comprises an elongated exit having a first or "major” dimension which extends transversely of the general flow of the composition through the nozzle.
  • the exit has a second or “minor” dimension orthogonal to the major dimension and it too extends transversely of the flow of the composition through the nozzle.
  • the major and minor dimensions define a slot transverse to the general flow of the composition through the nozzle.
  • the minor dimension has a maximum size of 0.25 to 0.45 mm (preferably 0.3 to 0.4 mm) and the major dimension has a size of from 0.5 to 1.5 mm.
  • the fantail comprises a homogenous distribution of the composition which is important for acceptably uniform coating, but it not known whether the fantail comprises an integral sheet of liquid or an atomised mist of closely spaced fine droplets or possibly a combination of both.
  • a nozzle should be chosen whose outlet exit has major and minor dimensions in about the middle of the preferred ranges, say 0.33 mm and 0.75 mm respectively and then the delivery pressure can be varied stepwise from 3.2 to 4.5 bar to investigate how the flow varies with pressure in this range. If a flow of greater width is preferred, the nozzle should be replaced by one having an outlet exit whose minor dimension is less than 0.33 mm so as to increase sheer and consequently reduce the viscosity of the composition being expelled. This increases the speed of expulsion and the width of the flow presumably because the inertial forces in the system increase with the velocity and so surface tension is more easily overcome to yield a wider flow.
  • the minor dimension of the outlet exit should increased to more than 0.33 mm thereby reducing shear and retaining more of the viscosity. This decreases the speed of expulsion and the inertial forces and so presumably surface tension is better able to draw in the width of the flow.
  • the viscosities at 22° C of the compositions should reduce to 0.015 to 0.5 pa.sec under high shear, say a shear rate of 10 000/sec as measured by an ICI Cone and Plate viscometer as described in ASTM Test D4827- 88. It is also preferred that the composition should have an extensional viscosity of below 0.4 pa.sec and especially below 0.2 pa.sec when measured according to the procedure described in the Haake Caber 1 Instruction Manual available from Thermo Haake (International) of Karsruhe, Germany when using 6mm plates having an initial separation of 3mm.
  • the plenum should have a dimension transverse to the flow through the nozzle of from 0.5 to 3 (especially 1.3 to 2.7) mm and a length of 0.2 to 4 (especially 0.2 to 3) mm. Most conveniently it should be cylindrical and of about the same transverse dimension (ie. radius) as the major dimension of the outlet exit. Increasing the transverse dimensions and/or decreasing the longitudinal dimension of the plenum decreases the shear and loss of viscosity leading to a slower speed of expulsion from the outlet orifice and a narrower flow. Conversely, decreasing the transverse dimensions and/or increasing the longitudinal dimension increases the shear and the loss of viscosity leading to a faster speed of expulsion from the outlet orifice and a wider flow.
  • a preferred outlet nozzle geometry comprises a plenum terminating with a hemispherical end which is blind except for the outlet orifice.
  • the orifice is preferably defined by the notional intrusion into the hemisphere of a wedge shape consisting of two opposed mutually inclined planes which meet to define a notional leading edge inside the plenum.
  • the leading edge in effect defines the major dimension of the exit from the outlet orifice.
  • the maximum minor dimension of the outlet exit is defined by the maximum distance between the inclined planes as they enter the hemispherical end of the plenum.
  • the planes are preferably inclined at into the plenum an angle of from 25° to 55° (especially 35° to 45°).
  • the leading edge intrudes to a point either lying on the "terminal plane" of the hemisphere or lying on a parallel plane either just upstream or just downstream of the terminal plane.
  • the "terminal plane" of the hemisphere is the circular plane of radius equal to the radius of the sphere of which the hemisphere forms half
  • the outlet exit has a projected shape which is elliptical. If the wedge penetrates further, the projected shape is that of a curtailed ellipse whose ends are defined by the cylindrical part of the plenum and so are curtailed and have a smaller curvature than would be the case if the shape were truly elliptical. The smaller curvature is more likely to give an even coating and in particular, the coating is less likely to contain streaks.
  • the parallel planes should be no more than 0.8 mm upstream or downstream of the terminal plane.
  • composition flowing in the central regions of the outlet orifice will be in closer proximity to a surface of the outlet orifice for a longer period of time than composition flowing in the lateral regions of the outlet.
  • Composition in the central region will therefore receive more shear in the outlet orifice than composition in the lateral regions which may compensate for the fact that composition in the central region may have received less shear elsewhere. It is possible that this compensation assists in creating a more homogenous coating of a target surface.
  • the nozzle can usefully also comprise a large chamber upstream of, and in communication with its plenum.
  • the chamber is large relative to the plenum, its precise dimensions are not critical but for guidance, it is proposed that its transverse dimensions be about 5 to 10 times the transverse dimensions of the plenum and its length be 5 to 20 (preferably 6 to 8) mm.
  • the nozzle is additionally provided with an auxiliary (preferably circular) orifice upstream of the plenum which receives composition under the delivery pressure of from 2.5 to 5 bar and directs it towards the plenum.
  • the preferred transverse dimension of the auxiliary orifice is from 0.8 to 1.5 mm, its preferred length is from 1.7 to 2.3 mm and the pressure drop across the orifice is preferably from 0.5 to 2 bar.
  • This auxiliary orifice and large chamber can increase the width of the laminar flow expelled from the main outlet to well over 120 mm, often reaching over 400 mm. This provides an extremely quick coating process.
  • An unexpected advantage of the nozzle provided with an auxiliary orifice is its resistance to blockages.
  • Most aqueous paints are at risk of containing a small concentration of unwanted agglomerates of pigment or opacifier particles, usually agglomerates of 200 ⁇ m or greater where ⁇ m equals 10 -6 m.
  • Agglomerates can accumulate in a nozzle and block its outlet orifice. It is supposed that the conditions of shear in the refined nozzle are sufficient to break down the agglomerates.
  • Density is strongly influenced in the architectural coating compositions by the concentration of heavy inorganic opacifiers such as rutile titanium dioxide (which also serves as a white pigment) or of coloured pigments or extenders such as chalk or clays. Pigment and extender concentrations are carefully chosen to give a colour of precise hue, chroma or lightness, so varying their concentration merely to adjust density is seldom practical. In short, density cannot be significantly varied without unacceptable consequences for opacity and colour.
  • the density of an architectural coating composition is from 1.01 to 1.6 kg/litre and is usually 1.01 to 1.2 kg/litre for woodstains and fungicides and 1.2 to 1.6 kg/litre for paints if dense pigments or opacifiers such as rutile are needed. Solid contents of the coating compositions can therefore be from 7 to 12 wt % for woodstains and fungicides and up to 70 wt % or more for paints.
  • This invention also provides apparatus for the airless spray-coating of a surface with a viscous non-Newtonian aqueous architectural coating composition, wherein the apparatus comprises
  • Brookfield viscosity was measured at 22°C using a Brookfield Viscometer, Model HA as supplied by Brookfield Engineering Laboratories Incorporated of Middleboro, Massachusetts.
  • a Brookfield Viscometer comprises a rotateable spindle which carries a disc which, when performing the measurement, is immersed into the coating composition about 10 mm below its surface.
  • the composition should be provided in a cylindrical container having a diameter of at least 100 mm so as to avoid errors due to the proximity of the container walls.
  • a Brookfield No. 3 Spindle is chosen, immersed into the composition and then rotated at Brookfield Speed No 10 for at least three revolutions.
  • the spindle is coupled to a torque measuring device which is calibrated to express torque in terms of the viscosity of the composition either directly or after the operation of a multiplier specified by Brookfield.
  • Figure 1 illustrates the shape of outflow 11 of composition expelled from exit 2 of an outlet orifice which shape is to be expected when the delivery pressure is less than 2.5 bar.
  • Outflow 11 has an initially flat profile which quickly converges into an approximately cylindrical jet 12. Jet 12 is unstable and breaks up into large irregular droplets 13 before striking tiny zone 3 of target surface 4 which is spaced 650 mm from exit 2.
  • Figure 2 illustrates the effects of increasing the delivery pressure beyond 2.5 bar whereupon expelled outflow 21 has an initially divergent flat profile reaching a width of about 30mm transverse of direction the flow of composition through exit 2.
  • Outflow 21 extends further from the exit before breaking up into large irregular droplets 22.
  • Outflow 21 begins by diverging transversely and then converges to a constriction 24 before becoming unstable and breaking up into droplets 22. Because of the greater width of outflow 21, it would be possible to use it for a moderately quick coating of a target surface 4a (shown in broken lines) positioned nearer to outlet orifice 2 than surface 4 and upstream of constriction 24.
  • Figure 3 illustrates the effects of increasing the delivery pressure to an optimum range of 3.5 to 4 bar.
  • a flat outflow 31 is obtained which diverges transversely producing a shape having approximately parabolic boundaries 35 and which remains stable until it strikes target surface 4.
  • the width of flow 31 increases to over 100 mm by the time it strikes target surface 4.
  • Figure 4 illustrates the effects of a delivery pressure beyond 5 bar whereupon expelled outflow 41 still has a flat profile as it leaves outlet orifice 2 but it is unstable and it quickly disintegrates into large irregular droplets 43 long before it reaches target surface 4.
  • Figure 5 shows the front elevation of a preferred nozzle 50 having opening 51a leading to wedge-shaped space 51 which (as shown in Figure 8 ) is bounded by mutually inclined planes 51b.
  • planes 51b intrude through hemispherical end 54a of plenum 54 so defining exit 52a to outlet orifice 52.
  • the inclined planes subtend an angle of 40° and terminate in a notional leading edge 51c lying in terminal plane 54b of hemispherical end 54a.
  • the distance as shown in Figure 8 which extends between points 52c and 52d on inclined surfaces 52b as well as on hemispherical end 54a extends transversely of the flow of composition through nozzle 50 and defines the maximum second or minor dimension of exit 52a.
  • Leading edge 51c extends transversely of the flow of composition through exit 52a and is also orthogonal to the second dimension of nozzle 50 and so when it is within hemispherical end 54a, leading edge 51c defines the first or major dimension of exit 52a
  • Hemispherical end 54a of plenum 54 is blind except for outlet orifice 52.
  • Nozzle 50 has a large chamber 53 (shown in Figures 6 and 7 ) which communicates with and is upstream of plenum 54.
  • Large chamber 53 communicates with a connector 55 adapted to receive a hose (not shown) through which architectural coating composition under a pressure of 2.5 to 5 bar can be delivered.
  • Large chamber 53 smoothes out any excessive pressure pulses and directs the delivered composition into plenum 54 from where it passes through outlet orifice 52 and its exit 52a to emerge as an outflow 31. Opening 51a and exit 52a are located in a protective channel 57 defined by shoulders 58.
  • FIG 9 shows on a larger scale the projection of the shape of the exit from modified outlet orifice 52x.
  • Outlet orifice 52x is defined by a pair of mutually inclined planes which extend beyond the terminal plane of the hemisphere and into the cylindrical part of the plenum so conferring a curtailed elliptical shape on ends 59x.
  • Ends 59x are inset from the true elliptical shape and so have a lesser curvature which serves to reduce the tendency for a coating to be streaky.
  • the minor diameter of the curtailed elliptical shape is the maximum minor dimension of the exit whilst its curtailed maximum diameter is the major dimension of the exit.
  • FIG 10 shows a refinement of the embodiment shown in Figures 5 to 9 .
  • two part nozzle 60 has plenum 64 which is shorter than plenum 54 shown in Figures 6 and 7 .
  • Plenum 64 receives composition under pressure from a larger chamber 65 which in turn receives it after it has passed through auxiliary orifice 66.
  • Larger chamber 65 and plenum 64 together serve as a conduit for conveying composition from the auxiliary orifice 66 to outlet orifice 52.
  • auxiliary orifice 66 reduces the tendency for blockage by agglomerates in the composition and also results in a wider fantail.
  • Figure 11 shows how a nozzle such as nozzle 60 in communication with a connector 67 can be joined by a coupling 69 to a delivery hose (not shown) push-fitted over the end of coupling 69.
  • the nozzle may be moulded from a thermoplastics material such as polyacetal or polypropylene.
  • a viscous aqueous non-Newtonian woodstain was made up by mixing together the ingredients shown in Table 1.
  • the woodstain was found to have at 22° C a low sheer Brookfield viscosity of 2.8 to 3.0 pascal.sec, an ICI Cone and Plate viscosity of 0.02 pa.sec, a surface tension of 35 mN/m and density of 1.015 kg/litre.
  • the woodstain was supplied in a 5 litre container into which a hand compressor capable of generating a pressure of 3 to at least 4.5 bar was fitted. Using the compressor, woodstain was taken from the container and delivered via a hose of 10 mm diameter to a nozzle as described with reference to Figures 5 to 10 of the drawings and expelled from its outlet.
  • TABLE 1 Ingredient Weight % Water 92.7 Vinyl Acetate/Vinyl "Versate" copolymer 4.4 Coloured Pigment 2.3 Cellulose/Acrylic thickeners 0.5 Biocide 0.1
  • a viscous aqueous non-Newtonian fence paint was made up by mixing together the ingredients shown in Table 2.
  • the paint was found to have at 22° C a low sheer Brookfield viscosity of 2.0 pa.sec, an extensional viscosity of 0.08 pa.sec, a surface tension of 35 mN/m and density of 1.027 kg/litre and a solids content of 10.1 wt %.
  • the paint was supplied in a 5 litre container into which a hand compressor capable of generating a pressure of 3 to at least 4.5 bar was fitted. Using the compressor, paint was taken from the container and delivered via a hose of 10 mm diameter to a nozzle as described with reference to Figures 10 to 11 of the drawings and expelled from its outlet.

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Claims (18)

  1. Verfahren zur Airless-Sprühbeschichtung einer Fläche mit einer viskosen wässrigen nichtnewtonschen Gebäudebeschichtungszusammensetzung, die ein Bindepolymer und Bestandteile, die aus Pigmenten, Farbstoffen, Opakern und Streckmitteln ausgewählt sind, umfasst, wobei die Zusammensetzung zum Beschichten vertikaler Flächen geeignet ist, wobei
    a) die Zusammensetzung ein Verdickungsmittel enthält und
    b) die Zusammensetzung einem Druck von 2 bis 5 bar ausgesetzt und dann aus einer Auslassöffnung (52) in einer Düse (50) gesprüht wird, wobei ein Ausstrom (31) der Beschichtungszusammensetzung entsteht, wobei der Ausstrom wenigstens solange nichtkonvergente Grenzen (35) aufweist, bis er eine Front mit einer Breite von nicht weniger als 30 mm gebildet hat.
  2. Verfahren gemäß Anspruch 1, wobei das Verdickungsmittel ein assoziatives Verdickungsmittel umfasst.
  3. Verfahren gemäß einem der vorstehenden Ansprüche, wobei die Zusammensetzung durch eine Hilfsöffnung (66) geleitet wird, die der Auslassöffnung vorgeschaltet ist.
  4. Verfahren gemäß einem der vorstehenden Ansprüche, wobei die Zusammensetzung eine Brookfield-Viskosität bei 22 °C von wenigstens 0,5 Pa.s aufweist.
  5. Verfahren gemäß einem der vorstehenden Ansprüche, wobei die Zusammensetzung aus einer Auslassöffnung gesprüht wird, wobei die Öffnung in Form eines Schlitzes vorliegt.
  6. Verfahren gemäß Anspruch 5, wobei der Schlitz im Wesentlichen elliptisch oder verkürzt elliptisch ist.
  7. Verfahren gemäß Anspruch 5 oder 6, wobei der Ausstrom die Form einer ungefähr parabolischen Sprühfahne annimmt.
  8. Verfahren gemäß einem der vorstehenden Ansprüche, wobei die Zusammensetzung einen Feststoffgehalt von wenigstens 7 Gew.-% aufweist.
  9. Verfahren gemäß einem der vorstehenden Ansprüche, wobei der Druck durch einen handbetriebenen Kompressor erzeugt wird.
  10. Verfahren gemäß einem der vorstehenden Ansprüche, wobei die Zusammensetzung durch eine Mischkammer geleitet wird, die der Auslassöffnung vorgeschaltet ist.
  11. Verfahren gemäß Anspruch 10, wobei die Mischkammer zylindrisch ist und in einem halbkugelförmigen Ende (54a) endet, in das eine gedachte Keilform, die geneigte Ebenen (51b) umfasst, eindringt und die Auslassöffnung definiert.
  12. Vorrichtung zur Airless-Sprühbeschichtung einer Fläche mit einer viskosen wässrigen nichtnewtonschen Gebäudebeschichtungszusammensetzung, wobei die Vorrichtung Folgendes umfasst:
    a) einen Behälter, der ein Bindepolymer, ein Verdickungsmittel und Bestandteile, die aus Pigmenten, Farbstoffen, Opakern und Streckmitteln ausgewählt sind, enthält;
    b) eine Düse (50) in Kommunikation mit dem Behälter, der eine Auslassöffnung (52) umfasst;
    c) einen Kompressor, der einen Druck von 2,5 bis 5 bar erzeugen kann; und
    d) ein Druckentspannungsventil, das Druck aus dem Behälter im Bereich von 2,5 bis 5,0 bar entspannt;
    wobei die Druckerzeugung durch den Kompressor es ermöglicht, dass Zusammensetzung aus der Auslassöffnung heraus aus dem Behälter gesprüht wird, wobei die Vorrichtung eine Hilfsöffnung (66), die der Auslassöffnung vorgeschaltet ist, und eine Leitungseinrichtung von der Hilfsöffnung zur Auslassöffnung umfasst, so dass Zusammensetzung durch die Hilfsöffnung geleitet werden kann, bevor sie aus der Auslassöffnung gesprüht wird.
  13. Vorrichtung gemäß Anspruch 12, wobei die Auslassöffnung einen Schlitz (52a) umfasst.
  14. Vorrichtung gemäß Anspruch 13, wobei die Form des Schlitzes elliptisch oder verkürzt elliptisch ist.
  15. Vorrichtung gemäß Anspruch 13 oder 14, wobei die Düse eine Mischkammer (54) enthält, die der Auslassöffnung vorgeschaltet ist.
  16. Vorrichtung gemäß einem der Ansprüche 13 bis 15, wobei die Mischkammer in einem halbkugelförmigen Ende (54a) endet, in das eine gedachte Keilform, die einander gegenüberliegende, zueinander geneigte Ebenen (51b) umfasst, eindringt und die Form der Auslassöffnung definiert.
  17. Modifikation einer Vorrichtung gemäß einem der Ansprüche 12 bis 16, wobei der Kompressor durch ein Haushaltsgerät ersetzt ist, das einen Druck von 2,5 bis 5 bar erzeugen kann.
  18. Verwendung einer Düse, die eine Auslassöffnung, eine Hilfsöffnung, die der Auslassöffnung vorgeschaltet ist, und eine Leitungseinrichtung, die die Hilfsöffnung mit dem Auslass verbindet, umfasst, bei der Airless-Sprühbeschichtung einer Fläche mit einer viskosen wässrigen nichtnewtonschen Gebäudebeschichtungszusammensetzung, die zum Beschichten einer vertikalen Fläche geeignet ist;
    wobei die Zusammensetzung ein Bindepolymer, ein Verdickungsmittel und Bestandteile, die aus Pigmenten, Farbstoffen, Opakern und Streckmitteln ausgewählt sind, umfasst;
    so dass ausgehend von der Auslassöffnung, nachdem diese einem Druck von 2 bis 5 bar ausgesetzt wurde, der auf die Zusammensetzung ausgeübt wird, ein Ausstrom der Zusammensetzung entsteht, der wenigstens solange nichtkonvergente Grenzen aufweist, bis er eine Front mit einer Breite von nicht weniger als 30 mm gebildet hat.
EP05076856.3A 2004-08-13 2005-08-10 Luftloses Spritzverfahren einer wässrigen Beschichtungszusammensetzung hoher Viskosität Active EP1625891B1 (de)

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EP05076856.3A EP1625891B1 (de) 2004-08-13 2005-08-10 Luftloses Spritzverfahren einer wässrigen Beschichtungszusammensetzung hoher Viskosität
PL05076856T PL1625891T3 (pl) 2004-08-13 2005-08-10 Bezpowietrzne natryskowe pokrywanie powierzchni lepką, wodną budowlaną kompozycją powłokową

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EP04380170A EP1627689A1 (de) 2004-08-13 2004-08-13 Methode zum luftlosen Bespritzen einer wässrigen Beschichtungszusammensetzung hoher Viskosität
EP05076856.3A EP1625891B1 (de) 2004-08-13 2005-08-10 Luftloses Spritzverfahren einer wässrigen Beschichtungszusammensetzung hoher Viskosität

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EP1625891A2 EP1625891A2 (de) 2006-02-15
EP1625891A3 EP1625891A3 (de) 2006-04-19
EP1625891B1 true EP1625891B1 (de) 2014-01-08

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0600674D0 (en) * 2006-01-13 2006-02-22 Ici Plc Airless Spray-Coating Of A Surface With A Viscous Aqueous Architectural Coating Composition

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Publication number Priority date Publication date Assignee Title
US4346849A (en) * 1976-07-19 1982-08-31 Nordson Corporation Airless spray nozzle and method of making it
US4756481A (en) * 1986-11-24 1988-07-12 Theo Krebs Ag Apparatus for spraying a flowable mass and including an airless spray gun
US5017409A (en) * 1988-06-13 1991-05-21 Union Carbide Chemicals And Plastics Technology Corporation Method of conformal coating
US6428844B1 (en) * 1993-02-03 2002-08-06 Rohm And Haas Company Reduction of microfoam in a spray-applied waterborne composition
US5486576A (en) * 1994-07-01 1996-01-23 Rohm And Haas Company Method for reducing microfoam in a spray-applied waterborne thermoset composition
US6168093B1 (en) * 1998-12-30 2001-01-02 Homax Products, Inc. Airless system for spraying coating material
US20030025002A1 (en) * 2001-08-04 2003-02-06 Jeffrey Hughes Pressurizable fluid spray system

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EP1625891A2 (de) 2006-02-15
EP1625891A3 (de) 2006-04-19

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