WO2014001154A1 - Composition de revêtement - Google Patents

Composition de revêtement Download PDF

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Publication number
WO2014001154A1
WO2014001154A1 PCT/EP2013/062645 EP2013062645W WO2014001154A1 WO 2014001154 A1 WO2014001154 A1 WO 2014001154A1 EP 2013062645 W EP2013062645 W EP 2013062645W WO 2014001154 A1 WO2014001154 A1 WO 2014001154A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
coating composition
release agent
composition according
friction resin
Prior art date
Application number
PCT/EP2013/062645
Other languages
German (de)
English (en)
Inventor
Michael Dornbusch
Hanna SMOLL
Nina Maria WICHNER
Original Assignee
Ewald Dörken 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 Ewald Dörken Ag filed Critical Ewald Dörken Ag
Publication of WO2014001154A1 publication Critical patent/WO2014001154A1/fr

Links

Classifications

    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
    • C09D5/4419—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications with polymers obtained otherwise than by polymerisation reactions only involving carbon-to-carbon unsaturated bonds
    • C09D5/443—Polyepoxides
    • C09D5/4457—Polyepoxides containing special additives, e.g. pigments, polymeric particles
    • 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
    • C09D17/00—Pigment pastes, e.g. for mixing in paints
    • C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
    • C09D17/005—Carbon black
    • 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
    • C09D17/00—Pigment pastes, e.g. for mixing in paints
    • C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
    • C09D17/007—Metal oxide
    • C09D17/008—Titanium dioxide
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
    • C09D5/4488—Cathodic paints
    • C09D5/4492—Cathodic paints containing special additives, e.g. grinding agents

Definitions

  • the invention relates to a coating composition
  • a coating composition comprising two components to be prepared, stored and transported separately.
  • the first component comprises an organic binder.
  • the second component comprises coloring substances and a friction resin.
  • the coating composition according to the invention is used above all for cathodic dip coating (hereinafter: KTL), which is also referred to as electrocoating.
  • KTL is a coating process in which binders which have cationic groups, as well as colorants and optionally other constituents of a coating composition in the so-called bath (KTL bath) are dissolved or dispersed in water.
  • binders which have cationic groups, as well as colorants and optionally other constituents of a coating composition in the so-called bath (KTL bath) are dissolved or dispersed in water.
  • a binder an amine-modified epoxy resin
  • Typical coloring substances are carbon black or titanium dioxide.
  • the coating composition for the cathodic dip-bath usually contains further constituents, eg. As catalysts for the binder, a friction resin and possibly other additives.
  • Coating compositions for KTL baths are widely available and give good paint films or coatings, at least for rackware.
  • Rackware refers to workpieces which are individually guided on a so-called frame fixed in the cathodic dip bath and which have no contact with other workpieces during coating.
  • the problem is the coating of mass-produced goods, also called mass small parts. These mass small parts, z. As screws, nuts, washers, short workpieces that are too small and too numerous to fix them individually and coat, z. B. guided in baskets through the cathodic dip bath.
  • the coating composition according to the invention is prepared and stored in two components and optionally transported. Only during the preparation of the cathodic dip bath the components are mixed with the addition of water.
  • the first component comprises a binder.
  • the binder for a cathodic dip bath often consists of an epoxy resin, although other binders are also suitable for the coating composition according to the invention. If an epoxy resin is used, it is usually an ammonium-modified epoxy resin, the ammonium modification causing the cationic charge of the epoxy resin.
  • the epoxy resin is reacted with acid, usually acetic acid, and is water-soluble or water-dispersible.
  • a particularly typical material class for binders for cathodic dip baths is bisphenol A diol polyether, as described in DE 10 2008 022 464, the disclosure of which we hereby make the subject of this patent application.
  • the second component of the coating composition according to the invention which is prepared separately, transported and optionally stored, comprises coloring substances, usually coloring pigments or dyes or a mixture of pigments and dyes.
  • Particularly typical pigments are carbon black or titanium dioxide, but also metal particles or particles consisting of metallic compounds, for. B. metal oxides.
  • the coloring substances are used as solids, usually in particulate form.
  • Friction resin and adhering thereto or incorporated therein coloring substances are usually present as a paste, ie in the form of particles which are dispersed in liquid.
  • the paste is usually miscible well with water or dilutable in water, as well as in the binder of the first component.
  • the friction resin is a binder which may be identical to the binder of component I. Preferably, however, it is a different binder from the component I, but with the binder of the component I during curing forms a common network and thus a homogeneous coating.
  • the friction resin is preferably an epoxy resin, in particular an amine-functional polyether. Particularly typical binders are bisphenol A diolpolyether or oligomeric epoxides such.
  • a friction resin, as it is usable with this composition for the inventive component II, is known from WO 98/07794 or WO 98/33835. The content of WO 98/07794 and WO 98/33835 are herewith the subject of the disclosure of this patent application.
  • a release agent is added to component II.
  • the inventors have found that the addition of a release agent effectively prevents two coated workpieces from contacting each other after the surface coating has been applied and then separated, still have a uniform surface coating without defects.
  • the release agent does not interfere with the coating of the workpieces in a cathodic dip bath. It can be partially or completely incorporated into the surface coating without affecting its effectiveness. But it is also possible that the release agent is at least partially washed out when rinsing the applied but not yet cured surface coating or expelled or degraded during curing of the coating.
  • the release agent is preferably a wax or a mixture of waxes.
  • polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, carnauba wax, synthetic waxes such as paraffin wax or Fischer-Tropsch wax or mixtures of these waxes may be added as waxes as release agents.
  • the waxes should preferably be present as a solid at temperatures up to 30 ° C. As a result, mixing of the release agent with the coloring substances and the friction resin, which are often present as a paste, is readily possible. In general, in the cathodic dip bath or during curing, the wax can readily be in liquid form without losing its function, without disturbing the deposition process or without impairing the properties of the deposited and possibly cured surface coating.
  • the release agent is advantageously added in an amount of 0.5% by weight to 35% by weight, preferably 1.0% by weight to 20% by weight, based on the total weight of the second component. Less release agent can lead to the desired effect is not achieved, more release agent is not absorbed by the component II or it can interfere with the structure of the surface coating or the paint film.
  • release agent can be variably adjusted within the limits mentioned within wide ranges.
  • the amount and possibly also the nature of the release agent can be selected particularly advantageously so that a predetermined friction coefficient range is set.
  • the adjustment of the friction coefficient range can be adjusted to an accuracy of +/- 0.01.
  • the adjustment by selecting the type and amount of the release agent is a routine routine for those skilled in the art.
  • to use and apply this routine activity for a KTL coating agent for mass small parts is new and unusual. It is particularly important for masses small parts, the friction coefficient, because a large part of the mass small parts z. B. has thread.
  • the second component of the coating composition may advantageously comprise further components.
  • catalysts for the binder of the first component may be included.
  • Typical catalysts are bismuth salts such. As bismuth salicylate, bismuth nitrate or bismuth acetate, organic tin compounds (sometimes no longer allowed) and other known catalysts for isocyanate crosslinking.
  • the second component may optionally contain wetting and dispersing agents, e.g. As alkali metal ammonium salts or modified ureas, defoamers, deaerators, leveling agents, stabilizers or other additives that contribute to a particularly simple application of the coating composition for the cathodic dip bath.
  • wetting and dispersing agents e.g. As alkali metal ammonium salts or modified ureas, defoamers, deaerators, leveling agents, stabilizers or other additives that contribute to a particularly simple application of the coating composition for the cathodic dip bath.
  • defoamer z. B. hydroxy-functional alkynes are used.
  • leveling agents phenoxypropanol, butoxypropanol and mixtures thereof are to be mentioned by way of example.
  • the preparation of a second component of a coating composition according to claim 1 is effected in a simple manner by mixing colorants, friction resin and release agent.
  • the mixing can, depending on the friction resin, coloring substance and release agent, take place in different ways, for.
  • stirring extruding or kneading.
  • the coloring substance, the friction resin and the release agent are kneaded with each other.
  • first colorants and friction resin are mixed, and that only then the release agent is mixed. That way, one becomes achieved particularly uniform distribution of the three essential components of the second component.
  • known from the prior art mixtures of colorants and friction resin can be processed according to the invention. It is particularly preferred that coloring substances and friction resin are present as particles in a paste or dispersion, and that the particles are at least partially coated by the admixing of the release agent with the release agent. In this way, a second component is achieved with a particularly uniform composition. If bulk small parts are coated with a KTL coating composition using a second component according to the invention, defects in the paint film of the workpieces are largely avoided.
  • the mixing of colorants, friction resin and release agent is carried out in a simple, advantageous manner, without the size of the particles of the colorants and / or the friction resin changes by the mixing of the release agent.
  • the second component it is possible without disadvantages for the second component to combine the mixing with a grinding operation for comminuting the particles of the coloring substances and / or the friction resin or to join after mixing of the release agent a grinding process, which comminutes the particles.
  • a KTL bath is prepared by mixing the first and second components of the coating composition in water, usually demineralized water.
  • the first and the second component are added to the KTL bath in a ratio which can be from 5: 1 to 1.5: 1. In this case, a ratio of 3.5: 1 to 2: 1 is preferred.
  • the ratio of water to coating composition that is, of the first and second component together, is from 4: 1 to 0.75: 1, with a ratio between 2: 1 and 1: 1 being preferred.
  • An ammonium-modified epoxy resin here: an aromatic diglycidyl ether with at least one bis-aryl alcohol, a primary amine and a monoepoxide, as described in EP 0 459 982, the disclosure of which we hereby make the subject of this patent application, is in aqueous solution and after stabilization with acetic acid having a solids content of 30% as the first component of the coating composition according to the invention for a cathodic dip bath.
  • the first component is commercially available in similar compositions or substances and equally useful in the invention.
  • the second component has as a coloring substance 5 weight carbon black particles, 40 weight of a friction resin, wherein the friction resin described above, with the binder of the first component identical epoxy resin is used with a solids content of 40%, 20% fillers, in this case: kaolin, 8 % of a defoamer, here a hydroxy-functional alkyne, which is used with a solids content of 50%, 0.5% catalyst, here: bismuth salicylate, and 30% by weight of a liquid, here water on.
  • the second component is present as a paste, ie as a non-flowable dispersion of solids in liquid.
  • This paste of friction resin, soot particles, fillers, additives, catalysts and water is kneaded with a total of 5% by weight of wax as a release agent. It is used in equal parts a mixture of polyethylene and polypropylene as a release agent.
  • the wax mixture of polyethylene and polypropylene is mixed into the second component in a Vollrath SM 2/2 mill. It is kneaded discontinuously. The mill is operated at 500 to 1300 revolutions per minute to evenly mix in the release agent.
  • the first and second components are packaged and stored in separate containers.
  • the release agent does not affect the shelf life of the second component.
  • For preparing the cathodic dip bath 45% by weight of demineralized water, 35% by weight of the first component and 20% by weight of the second component are mixed. Baskets containing screws, nuts and washers are immersed in this bath. The screws, nuts and washers are in the baskets each in places to each other and are thus connected in total as a cathode.
  • a paint film (wet) with a layer thickness of 10 ⁇ m is deposited over a period of 2 minutes. While the paint film is deposited, the workpieces to be coated are circulated. As a result, the contact points of the workpieces alternate with each other and each workpiece is coated with a complete paint film.
  • the baskets are lifted out of the cathodic dip bath with the screws, nuts and washers.
  • the coated workpieces rest against one another in the baskets, but are then separated, eg. B. by being poured onto a conveyor belt.
  • the coated with the coating composition according to the invention workpieces are each coated or coated by a complete paint film after separation. They show no defects.
  • the washed mass fractions are now fed through a continuous furnace on the assembly line, which is set at a drying temperature of 175 ° C. At this temperature, the binder and the friction resin harden into a uniform, common paint film.
  • the release agent mixture of polyethylene and polypropylene liquefies at the drying temperature initially, and then, after leaving the continuous furnace, to solidify again during cooling of the workpieces in the paint film.
  • the cured, dry paint film has a thickness of 10 ⁇ .
  • the first component for this embodiment II agrees with the first component for the embodiment I match. Changes only occur for the composition of the second component.
  • the second component for this embodiment II is composed according to the following compilation deviating from the embodiment I. It has the following components:
  • Titanium dioxide 2.0 weight
  • the second component is prepared by mixing together all the components of the second component, colorants, friction resin, additives, catalysts and release agents.
  • component I and component II which together form the coating composition, are filled and stored separately. Only for the preparation of the cathodic dip bath, the two components are mixed in a predetermined ratio with demineralized water.
  • the cathodic dip bath For preparing the cathodic dip bath, 60% by weight of demineralized water, 30% by weight of the first component and 10% by weight of the second component are mixed. In this bath baskets, the mass small parts such. As screws, nuts and washers, immersed. The screws, nuts and washers abut each other and are connected as a cathode.
  • V voltage is a paint film (wet) with a layer thickness of 20 ⁇ deposited over a period of 4 minutes. While the paint film is deposited, the workpieces to be coated are circulated. As a result, the contact points change and each workpiece is coated with a complete paint film.
  • the baskets are lifted out of the cathodic dip bath with the screws, nuts and washers.
  • the coated workpieces are in the baskets together, but then isolated, z. B. by being poured onto a conveyor belt.
  • the coated with the coating composition according to the invention workpieces are each coated or coated by a complete paint film after separation. They show no defects.
  • the washed mass fractions are now passed on the assembly line through a continuous furnace, which is set to a drying temperature of 185 ° C. At this temperature, the binder and the friction resin harden into a uniform, common paint film.
  • the release agent is temperature resistant and is incorporated into the forming paint film without disturbing.
  • the cured, dry paint film has a thickness of 20 ⁇ .

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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)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne une composition de revêtement présentant un premier composant comprenant un liant organique cationique qui est soluble ou dispersable dans l'eau ainsi qu'un deuxième composant qui est fabriqué et stocké séparément du premier composant et qui présente des substances colorantes et une résine de broyage. Pour éviter des défauts lors du revêtement de petites pièces de série, un agent de séparation est ajouté au deuxième composant. L'invention concerne également un procédé de production du deuxième composant.
PCT/EP2013/062645 2012-06-28 2013-06-18 Composition de revêtement WO2014001154A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210105706 DE102012105706A1 (de) 2012-06-28 2012-06-28 Beschichtungszusammensetzung
DE102012105706.0 2012-06-28

Publications (1)

Publication Number Publication Date
WO2014001154A1 true WO2014001154A1 (fr) 2014-01-03

Family

ID=48782284

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/062645 WO2014001154A1 (fr) 2012-06-28 2013-06-18 Composition de revêtement

Country Status (2)

Country Link
DE (1) DE102012105706A1 (fr)
WO (1) WO2014001154A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459982A1 (fr) 1988-12-22 1991-12-11 Basf Corp Resine dispersee a pigments.
DE4244209A1 (de) * 1992-12-24 1994-06-30 Basf Lacke & Farben Elektrotauchlacke und Verfahren zur Beschichtung elektrisch leitfähiger Substrate
WO1998007794A1 (fr) 1996-08-22 1998-02-26 Basf Coatings Ag Produit de dispersion pour la fabrication d'un vernis a immersion precipitable par electrophorese
WO1998033835A1 (fr) 1997-02-03 1998-08-06 Basf Coatings Ag Dispersion aqueuse de liant pour peinture pour trempage electrophoretique
DE102008016220A1 (de) * 2008-03-27 2009-10-01 Basf Coatings Ag Elektrotauchlacke enthaltend Polymethylenharnstoff
DE102008022464A1 (de) 2008-05-07 2009-11-12 Basf Coatings Ag Kathodischer Elektrotauchlack enthaltend Vinylpyrrolidon-Copolymer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459982A1 (fr) 1988-12-22 1991-12-11 Basf Corp Resine dispersee a pigments.
DE4244209A1 (de) * 1992-12-24 1994-06-30 Basf Lacke & Farben Elektrotauchlacke und Verfahren zur Beschichtung elektrisch leitfähiger Substrate
WO1998007794A1 (fr) 1996-08-22 1998-02-26 Basf Coatings Ag Produit de dispersion pour la fabrication d'un vernis a immersion precipitable par electrophorese
WO1998033835A1 (fr) 1997-02-03 1998-08-06 Basf Coatings Ag Dispersion aqueuse de liant pour peinture pour trempage electrophoretique
DE102008016220A1 (de) * 2008-03-27 2009-10-01 Basf Coatings Ag Elektrotauchlacke enthaltend Polymethylenharnstoff
DE102008022464A1 (de) 2008-05-07 2009-11-12 Basf Coatings Ag Kathodischer Elektrotauchlack enthaltend Vinylpyrrolidon-Copolymer

Also Published As

Publication number Publication date
DE102012105706A1 (de) 2014-01-02

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