WO2020007602A1 - Utilisation d'alcools polyvinyliques dans des agents porteurs à base d'eau pour supprimer des pertes de peinture à la pulvérisation - Google Patents

Utilisation d'alcools polyvinyliques dans des agents porteurs à base d'eau pour supprimer des pertes de peinture à la pulvérisation Download PDF

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Publication number
WO2020007602A1
WO2020007602A1 PCT/EP2019/066024 EP2019066024W WO2020007602A1 WO 2020007602 A1 WO2020007602 A1 WO 2020007602A1 EP 2019066024 W EP2019066024 W EP 2019066024W WO 2020007602 A1 WO2020007602 A1 WO 2020007602A1
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Prior art keywords
weight
water
carrier medium
particularly preferably
less
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Ceased
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PCT/EP2019/066024
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German (de)
English (en)
Inventor
Christian KOLT
Eric Bergmann
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Henkel AG and Co KGaA
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Henkel AG and Co KGaA
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Publication of WO2020007602A1 publication Critical patent/WO2020007602A1/fr
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions

Definitions

  • the present invention relates to the use of a water-based agent which contains at least one thickener based on polyvinyl alcohol with a viscosity of at least 20 mPas and at least one non-ionic surfactant, as a carrier medium for separating paint overspray from paint booths. Furthermore, the present invention relates to a method for separating paint overspray from the ambient air using the water-based agent described.
  • lacquer overspray or lacquer mist is the portion of the lacquer that does not get onto the workpiece to be lacquered, but into the environment.
  • the paint overspray can be caused, for example, by spraying past or flowing off the workpiece.
  • the spray technology used and its handling in particular have an influence on the amount of losses caused by paint overspray, which can account for up to 90% of the paint used.
  • the paint overspray that has got into the environment must be separated and disposed of or disposed of in a controlled manner. This is done using various technologies of paint deposition.
  • DE 10 2008 046 409 A1 describes a method for removing solids from the overspray formed during the painting of objects, in which the overspray is taken up by an air stream and transported to a separation surface over which a separation liquid flows, where a large part of at least the solids is in the separation liquid passes over, is transported away from this and is removed from the liquid by separation.
  • a separation liquid is used which comprises a detackifying medium and optionally a carrier fluid, with paint overspray particles being detackled by the detackifying medium.
  • EP 2 365 037 A1 describes an aqueous separating liquid for collecting paint overspray from a gas stream which contains at least 49.95% by weight of water, at least one nonionic surface-active agent and 5 to 50% by weight of an organic water-soluble film-supporting agent Component which is selected from monomeric polyols with at least three hydroxyl groups in the polymer and polymeric polyols selected from poly (ethylene glycols), polyester polyols, acrylic polyols and polyurethane polyols, the aqueous separating solution having a viscosity expressed as the outflow time in the range from 1 1 s to 25 s according to DIN 53 21 1 using a 4 mm flow cup at 23 ° C.
  • the separation liquid described can be used in a process in which a gas stream is passed through the painting booth and the paint overspray is brought into contact with the gas stream.
  • the gas stream is passed over a surface on which an essentially continuous liquid film of the separating liquid is formed, as a result of which paint particles or droplets from the gas stream are transferred into the separating liquid.
  • EP 3 165 577 describes an aqueous carrier medium for washing out paint overspray which contains at least 40% by weight of a polyfunctional organic oxo compound.
  • the carrier medium is characterized in that its viscosity lies over a range of shear stresses in a predetermined corridor, so that a homogeneous, laminar flow of the carrier medium from the separating surfaces is ensured over time.
  • EP 2 995 657 discloses an aqueous separation liquid which contains at least 49.9% by weight of water, 5 to 50% by weight of at least one organic water-soluble polyol and at least one low molecular weight cellulose derivative as a rheology modifier, and the use of the described separation liquid in a process for removing paint overspray from a paint spray booth.
  • a variant of wet scrubbing has recently become established in the field of paint separation, in which the paint overspray is electrically charged in the circulating air, then ionized with high voltage and moved to a separation area in the electric field and bound with release agents.
  • the release agent when selecting the release agent, particular care must be taken to ensure that the dilution properties can be kept stable when flowing around the separation surfaces.
  • Another problem that occurs with processes with electrostatically assisted wet washing is the accumulation of ozone due to the ionization of the paint overspray, which can lead to a chemical degradation of rheological additives that may be contained in the release agent, which further influences its flow behavior.
  • the carrier media known in the prior art have the disadvantage that they are susceptible to degradations induced by oxidation and are turbulent Flow behavior, which can lead to a disturbance of the electrical field, which significantly deteriorates the separation rate.
  • a first subject of the present invention is therefore the use of a water-based agent comprising a) less than 10% by weight of at least one thickener selected from such acylated polyvinyl alcohols or their hydrolyzates, which are used as a 4% by weight solution in water in a Temperature of 20 ° C have a viscosity determined according to DIN 53015 of at least 20 mPas; and b) less than 5% by weight of at least one non-ionic surfactant as a carrier medium for separating paint overspray from paint booths.
  • the weight specifications of the at least one thickener and the at least one nonionic surfactant each relate to the total weight of the water-based agent.
  • the carrier medium is understood to be the liquid medium which is carried out in the cycle of wet washing and which absorbs the paint overspray. Accordingly, the carrier medium can by definition contain the paint overspray, but is not composed of this.
  • paint overspray of a paint booth is understood to mean the paint components and particles which are not immobilized on the surface to be painted and which are carried out of the paint booth with the cabin air.
  • the paint overspray therefore consists of gaseous or liquid paint components such as solvents and leveling agents as well as the pigmented or unpigmented particulate paint components.
  • the viscosity is defined as the first derivative of the shear stress after the shear rate and can be determined as such by means of a Coulette rotary viscometer with a cone and plate construction of the measuring head and a temperature of 20 ° C.
  • the carrier medium is generally passed over a passive separating plate, the paint overspray being charged by the build-up of an electric field and being introduced into the carrier medium in this way.
  • the viscosity of the water-based agent used as the carrier medium is one of the most important parameters and determines its usability. If the agent has an insufficient viscosity, there may be an uneven flow of the carrier medium, for example from the separating plates. The turbulence that arises in this way can lead to malfunctions in the electrical field, for example electrical arcing, which can result in damage and contamination of the separating plates. It was surprisingly found that the use of a water-based agent as described above leads to the formation of a stable film on the passive deposition plate. This ensures, on the one hand, that the paint particles are always taken up and transported away by sufficient carrier medium and in this way the contamination of the separating plates is prevented. Furthermore, the flow of a homogeneous film of the carrier medium ensures that the electrical voltage required for the separation of the paint particles is not subject to any fluctuations, and thus the separation performance remains largely constant.
  • the thickener as a 4% by weight solution in water at a temperature of 20 ° C., has a viscosity determined according to DIN 53015 of at least 30 mPas, preferably of at least 40 mPas.
  • the viscosity of the thickener, as determined, is preferably not more than 150 mPas, particularly preferably not more than 100 mPas.
  • the thickener contained in the water-based agent for use as a carrier medium is preferably selected from hydrolyzates of acylated, preferably formylated or acetylated, particularly preferably acetylated polyvinyl alcohol with a degree of hydrolysis of more than 70 mol%, preferably more than 80 mol%, but preferably less than 90 mole%.
  • these thickeners have proven to be particularly efficient in the formation of a stable film on the separating plates.
  • the amount of thickener in the water-based medium is not too high.
  • An embodiment is therefore preferred in which the proportion of the thickener is at least 1% by weight, is preferably at least 2% by weight, but preferably less than 8% by weight, particularly preferably less than 5% by weight, in each case based on the total weight of the water-based agent.
  • the water-based agent for use as a carrier medium comprises a nonionic surfactant.
  • This nonionic surfactant is preferably selected from alkoxylated fatty alcohols or fatty amines, which in turn are preferably selected from alkoxylated saturated or unsaturated aliphatic alcohols or amines with an aliphatic chain length of at least 8, preferably at least 10 and particularly preferably at least 12, but preferably not more more than 20, particularly preferably not more than 18 and particularly preferably not more than 16 carbon atoms.
  • the alkoxylated fatty alcohols and fatty amines are preferably with at least 3, preferably with at least 6, particularly preferably with at least 8, in particular with at least 10, but preferably not more than 16, particularly preferably not more than 14, ethylene oxide and / or propylene units, preferably ethylene oxide units. Units, alkoxylated.
  • the water-based agent contains the at least one nonionic surfactant in an amount of at least 0.05% by weight, preferably at least 0.1% by weight, particularly preferably at least 0.3% by weight. %, but preferably less than 3% by weight, particularly preferably less than 2% by weight and in particular less than 1% by weight, in each case based on the total weight of the water-based agent.
  • the water-based agent for use as a carrier medium is distinguished in that it additionally contains less than 40% by weight, preferably less than 25% by weight, particularly preferably less than 15% by weight, but preferably at least 5% by weight of polyfunctional organic oxo compounds having no more than 12 carbon atoms, preferably having no more than 9 carbon atoms, particularly preferably having no more than 6 carbon atoms, particularly preferably having less than 6 carbon atoms, in each case based on the total weight of the Water-based agent.
  • polyfunctional organic oxo compounds are understood to mean compounds which have at least three functional groups selected from hydroxyl, ester and / or ether groups, at least one hydroxyl group always being present, in a preferred embodiment no heteroatom other than oxygen is contained.
  • the polyfunctional organic oxo compounds are selected from compounds with at least three functional groups, the functional groups being hydroxyl and / or ether groups.
  • the polyfunctional organic oxo compounds are selected from compounds with at least two hydroxyl groups, particularly preferably from compounds with at least three hydroxyl groups.
  • Preferred representatives of the polyfunctional organic compounds are 1, 2,3-propanetriol, 1, 1, 1-tris (hydroxymethyl) ethane, threitol, erythritol, pentaerythritol, pentites such as xylitol, adonite and arabitol, hexites such as sorbitol and mannitol, aldotetrosis such as erythrose , Aldopentoses such as ribose and xylose, aldohexoses such as glucose and mannose and its simple ethers each having no more than 4 carbon atoms or a total of four ethylene oxide and / or propylene oxide units in the ether group.
  • the polyfunctional organic oxo compound is 1, 2,3-propanetriol.
  • the presence of the polyfunctional organic oxo compounds supports the detackification of the paint particles in the carrier medium and prevents greater coagulation of the paint particles contained in the carrier medium, which is disadvantageous in particular for the flow behavior on the separating plates and also promotes their soiling.
  • a relatively low water vapor partial pressure in the cabin air can be set via the hygroscopic properties of the polyfunctional organic oxo compounds.
  • the water-based agent should have a suitable viscosity. Too high a viscosity can, for example, result in the drainage of the carrier medium from the separation surfaces or plates being slowed down, so that, while maintaining a volume flow specified in the process flow, a critical wet film build-up is formed on the separation surfaces, in which the wet film of the carrier medium under the action gravitationally sagging and, analogous to the runner formation, no drainage in homogeneous wet film thickness can be achieved over the entire drainage surface.
  • the water-based agent when used as a carrier medium, preferably has a viscosity at shear rates in the range from 10 to 1000 s -1 , which is always above 10 mPas, particularly preferably above 20 mPas. Furthermore, the ratio of rest viscosity hio to process viscosity h-ioo is preferably not greater than 10: 1. In this way, a homogeneous drainage of the carrier medium can be achieved at the separation surfaces.
  • the process viscosity h-ioo denotes the viscosity determined in this way at a shear rate of 100 s _1 , which roughly corresponds to the shear stress when the carrier medium runs off the separation surfaces of a system for separating paint overspray by means of wet washing. Is analog the rest viscosity h-io the viscosity determined in this way at a shear rate of 10 S 1 .
  • Another object of the present invention is a method for separating paint overspray from the ambient air, which is characterized in that i) the paint overspray is guided with the ambient air onto a separation surface wetted by a carrier medium, and ii) part of the Carrier medium that has taken up paint overspray from the ambient air, is removed from the separating surface and at the same time is replaced by another part of the same carrier medium that differs from the removed part only in that less paint overspray is contained in the same volume, whereby , the carrier medium in addition to water, at least one non-ionic surfactant and at least one thickener selected from such acylated polyvinyl alcohols or their hydrolyzates which, as a 4% strength by weight solution in water at a temperature of 20 ° C., determine a viscosity in accordance with DIN 53015 have at least 20 mPas, the proportion of the non-ionic Ten sids is less than 5% by weight and the proportion of thickeners is less than
  • the deposition surface is continuously washed around by the carrier medium, the carrier medium preferably flowing off the deposition surface following gravity.
  • the flow around the deposition surface is preferably laminar.
  • a laminar flow of the carrier medium on the separating surfaces is defined in the context of the present invention in such a way that the carrier medium flows outside of a laminar boundary layer following gravity almost parallel to the separating surface and the flow neither breaks off nor swirls, so that with a constant volume flow of the flushing carrier medium largely stationary flow along the separation surface results.
  • a homogeneous wetting of the deposition surfaces can be achieved using the specified carrier medium.
  • the film that forms on the deposition surface should also have a sufficient thickness to prevent minor swirling on the surface from damaging or contaminating the deposition plates.
  • An embodiment is therefore preferred in which a wet film coating of at least 0.5 l / m 2 , but preferably less than 2 l / m 2 , in each case based on the volume of the carrier medium, is realized on the deposition surface.
  • the use of the specified carrier medium or the water-based agent allows a very small spacing of the separation surfaces without there being a risk of electrical flashovers, for example caused by an inhomogeneous drainage of the carrier medium.
  • This is particularly advantageous if the deposition process is supported electrostatically.
  • An embodiment is therefore preferred in which the paint overspray is electrostatically charged in the ambient air under the action of an electrical voltage and transported to the separation surface in the electrical field.
  • the separating surface is made from a flat metallic material and the electrical voltage is preferably applied between the separating surface and a metallic electrode which is in direct contact with the ambient air.
  • Exemplary recipes are listed below which are suitable as water-based agents for use according to the invention as a carrier medium for separating paint overspray. However, these recipes are by no means to be understood as a restriction, but merely as an illustration of the inventive concept.
  • Exemplary water-based agents according to the invention for use as a carrier medium are summarized in Table 1, the amounts being given in percent by weight, based on the total weight of the water-based agent.
  • non-ionic surfactant available from BASF SE: cocosamine + 12EO
  • non-ionic surfactant available from BASF SE: C12-C14 + 3EO
  • Both partially hydrolyzed acetylated polyvinyl alcohols PVA-1 and PVA-2 used in the recipes give the particular thickening properties in the proportion used according to Examples 1 and 2, so that they can be used according to the invention in combination with the other constituents.
  • the viscosity-shear rate profile of the polyvinyl alcohols in the proportions given in Table 1 is shown in Figure 1.
  • the viscosity was measured over the specified shear rate range of 0.01-100 reciprocal seconds using a plate / cone viscometer (Haake Mars 60, Thermo Fisher Scientific Inc.) with a cone diameter of 35 mm at 20 ° C. when going through a shear rate staircase from 0.01 - 100 s-1 with 45 measured values per decade, whereby the first cycle is shown.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne l'utilisation d'un agent à base d'eau renfermant au moins un épaississant à base d'alcool polyvinylique présentant une viscosité au moins égale à 20 mPas et au moins un tensioactif non ionique, en tant qu'agent porteur, pour supprimer des pertes de peinture à la pulvérisation dans des cabines d'application de peinture. Cette invention concerne en outre un procédé pour supprimer, de l'air ambiant, des pertes de peinture à la pulvérisation au moyen de l'agent à base d'eau selon l'invention.
PCT/EP2019/066024 2018-07-03 2019-06-18 Utilisation d'alcools polyvinyliques dans des agents porteurs à base d'eau pour supprimer des pertes de peinture à la pulvérisation Ceased WO2020007602A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18181422 2018-07-03
EP18181422.9 2018-07-03

Publications (1)

Publication Number Publication Date
WO2020007602A1 true WO2020007602A1 (fr) 2020-01-09

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PCT/EP2019/066024 Ceased WO2020007602A1 (fr) 2018-07-03 2019-06-18 Utilisation d'alcools polyvinyliques dans des agents porteurs à base d'eau pour supprimer des pertes de peinture à la pulvérisation

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753738A (en) * 1987-08-07 1988-06-28 Nalco Chemical Company Sludge conditioning process
DE102008046409A1 (de) 2008-09-04 2010-05-12 Eisenmann Anlagenbau Gmbh & Co. Kg Verfahren zum Abscheiden von Lack-Overspray
WO2011028274A2 (fr) * 2009-09-03 2011-03-10 Rhodia Operations Revêtements de protection biodégradables et leurs procédés d'utilisation
EP2365037A1 (fr) 2010-03-10 2011-09-14 PPG Industries Ohio, Inc. Verfahren zur Entfernung eines Lack-Oversprays von einer Lackierkabine
EP2995657A1 (fr) 2014-09-10 2016-03-16 PPG Industries Ohio Inc. Liquide de séparation aqueuse et procédé permettant d'éliminer les excédents de peinture vaporisée dans une cabine de pulvérisation de peinture
EP3165577A1 (fr) 2015-11-06 2017-05-10 Henkel AG & Co. KGaA Milieu de support de suppression d'excès de projection de peinture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753738A (en) * 1987-08-07 1988-06-28 Nalco Chemical Company Sludge conditioning process
DE102008046409A1 (de) 2008-09-04 2010-05-12 Eisenmann Anlagenbau Gmbh & Co. Kg Verfahren zum Abscheiden von Lack-Overspray
WO2011028274A2 (fr) * 2009-09-03 2011-03-10 Rhodia Operations Revêtements de protection biodégradables et leurs procédés d'utilisation
EP2365037A1 (fr) 2010-03-10 2011-09-14 PPG Industries Ohio, Inc. Verfahren zur Entfernung eines Lack-Oversprays von einer Lackierkabine
EP2995657A1 (fr) 2014-09-10 2016-03-16 PPG Industries Ohio Inc. Liquide de séparation aqueuse et procédé permettant d'éliminer les excédents de peinture vaporisée dans une cabine de pulvérisation de peinture
EP3165577A1 (fr) 2015-11-06 2017-05-10 Henkel AG & Co. KGaA Milieu de support de suppression d'excès de projection de peinture

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