WO2019141502A1 - Peinture dispersion - Google Patents

Peinture dispersion Download PDF

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Publication number
WO2019141502A1
WO2019141502A1 PCT/EP2019/000006 EP2019000006W WO2019141502A1 WO 2019141502 A1 WO2019141502 A1 WO 2019141502A1 EP 2019000006 W EP2019000006 W EP 2019000006W WO 2019141502 A1 WO2019141502 A1 WO 2019141502A1
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WO
WIPO (PCT)
Prior art keywords
calcium carbonate
emulsion paint
spray
carbonate particles
weight
Prior art date
Application number
PCT/EP2019/000006
Other languages
German (de)
English (en)
Inventor
Wolfgang Dilla
Christoph Nover
Ralf-Dieter Schnebeck
Thomas Steinbrecher
Marijan Vucak
Original Assignee
Schaefer Kalk Gmbh & Co. Kg
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 Schaefer Kalk Gmbh & Co. Kg filed Critical Schaefer Kalk Gmbh & Co. Kg
Priority to EP19700856.8A priority Critical patent/EP3740538A1/fr
Publication of WO2019141502A1 publication Critical patent/WO2019141502A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C09C1/021—Calcium carbonates
    • 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
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • 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
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C09D7/40—Additives
    • C09D7/66—Additives characterised by particle size
    • C09D7/69—Particle size larger than 1000 nm
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C01P2004/52—Particles with a specific particle size distribution highly monodisperse size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/003—Additives being defined by their diameter
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/006—Additives being defined by their surface area

Definitions

  • the present invention relates to an emulsion paint comprising at least water and spray-dried calcium carbonate particles.
  • Fields of application of the emulsion paint include in particular their use as wall paint for the interior and the exterior (facade paint).
  • Emulsion paints in particular plastic dispersion paints, are one
  • paints based on dispersions in particular polymer dispersions (plastic, synthetic resin dispersions) and colorants, in particular pigments.
  • the emulsion paints are often referred to as latex paints or summarily as binder colors.
  • a paint is defined as "liquid to paste-like coating material, which is applied primarily by brushing or rolling". The paints give after the order on a
  • Zinc chromates is already known.
  • US 2010/0263576 A1 discloses a dry, aggregated
  • Calcium carbonate comprising calcium carbonate and at least one inorganic binder, the dry calcium carbonate aggregating a middle one
  • Particle size (D50) of at least 5 pm A composition containing such a calcium carbonate is also described. Further, a product such as a paint and methods for producing a product containing such an aggregated calcium carbonate are shown.
  • As calcium carbonate both ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) can be used.
  • the preparation of the aggregated calcium carbonate may optionally after a
  • Preferred amount ranges for the inorganic binder are not mentioned.
  • the resulting aggregated calcium carbonates are tested in paints having a pigment volume concentration (PVK) of 65% or 45%.
  • the comparative materials used are fine GCC, fine spray-dried GCC with an average particle size of 0.7 ⁇ m and coarse-grained GCC with an average particle size of 12 to 14 ⁇ m.
  • the weight fraction of the binder, based on GCC, is between 2.4% by weight and 9.1% by weight for the aggregated calcium carbonates.
  • Sheen values are 1.5 to 3.8 (PVK 65%, Table I), 2.0 to 25.7 (PVK 65%, Table II), or 3.4 to 6.4 (PVK 45%, Table III) and an opacity of 97.34 to 98.24 (PVK 65%, Table I), 97.28 to 98.82 (PVK 65%, Table II) or 95.06 to 95, 39 (PVK 45%, Table III).
  • Dispersion colors are avoided as possible.
  • WO 2014/202836 A1 relates to a composition containing precipitated
  • the composition comprises a plurality of necessarily spherical granules having an average particle diameter of 1 to 50 ⁇ mh, which are formed from precipitated primary calcium carbonate particles having a particle size of 30 to 60 nm, wherein at least a portion of the primary particles can be released by deagglomeration in aqueous suspension.
  • the composition can for
  • Pulp sizing agents are used.
  • the document further relates to a method for storing precipitated calcium carbonate particles with a mean diameter in the nanometer range.
  • the preparation of the calcium carbonate primary particles is preferably carried out by spray drying.
  • Emulsion paints in particular wall paints, are not described in the document.
  • step b the slurry from step a. spray-dried to form the granules containing calcium carbonate.
  • the median diameter of the submicron calcium carbonate should preferably be in the range of about 0.01 to about 0.5 pm.
  • the aim of the document is the use of calcium carbonate particles as crystallization seeds in combination with a precipitating builder to accelerate the removal of soluble calcium ions from wash water.
  • Emulsion paints in particular wall paints, are not mentioned in the document.
  • Sheen values and abrasiveness or wet abrasion are not mentioned in the document.
  • EP 2 796 412 A1 describes a process for the preparation of nanoscale calcium carbonate particles by spray drying, comprising the steps of
  • the resulting calcium carbonate comprises nanoparticles smaller than 200 nm, in particular nanorods with a length of about 100 nm and a width of about 50 nm.
  • the reference teaches that calcium carbonate is often used in the manufacture of plastics, rubbers, adhesives, sealants, papers, inks, wraps, paints, cosmetics and pharmaceuticals. By modifying the surface of the calcium carbonate nanoparticles, it would be possible to control the theological and mechanical properties of the material. Furthermore, in plastic materials, the nanoscale calcium carbonate can be used as a pigment and replace up to 25% of the commonly used pigments.
  • Emulsion paints in particular wall paints, are not mentioned in the document. Likewise, there is no information on Sheen values and abrasiveness or wet abrasion.
  • WO 2013/050495 A1 relates to precipitated calcium carbonate particles in the form of nanofibers or chain-like agglomerates. Furthermore, the concerns
  • Spray drying is mentioned as one of several ways of drying the precipitated calcium carbonate particles (see page 10, lines 3-9).
  • Exemplary aqueous emulsion paints include 5.0 or 6.0 weight percent titanium dioxide and 15.0 weight percent or 6 weight percent to 14 weight percent PCC (see page 13, Table).
  • the aim is to produce watery, matt or silky-glossy paints
  • the publication contains information on the abrasiveness (see page 14, lines 30 to 33, Tables 1-4). It is noticeable, however, that the "inventive" examples of this publication have a better opacity, but a poorer sheen and usually also a worse abrasiveness.
  • the contrast ratio (KV, the values are between 97.0% and 98.9%), the whiteness Ry (the stated values are between 91, 4% and 94.1%) and the wet resistance (the stated values) were investigated between 50.4 g / m 2 and 79.9 g / m 2 ) and the sheen (the values stated are between 4% and 9%).
  • an emulsion paint comprising at least water and spray-dried calcium carbonate particles, which is characterized in that the calcium carbonate particles were obtained by spray-drying a suspension of precipitated calcium carbonate particles, it is surprisingly possible to obtain a better one Disperse paint accessible, which is particularly suitable as a wall paint for indoor and outdoor use.
  • Paint has a comparatively low sheen. Furthermore, the paint obtainable by applying the emulsion paint has high whiteness and high hiding power. In addition, the abrasiveness and wet abrasion of the paint obtainable by applying the emulsion paint is very low.
  • Titanium dioxide as a pigment, significantly reduced
  • the subject of the present invention is accordingly a
  • Emulsion paint comprising at least water and spray-dried
  • the water contained in the dispersion paint according to the invention preferably serves as a solvent or dispersant for in the
  • Emulsion paint is preferably at least 10.0 wt .-%, preferably at least 20.0 wt.%, Particularly preferably at least 30.0 wt .-%, advantageously at least 35.0 wt .-%, in particular at least 50.0 wt. %. In each case based on the total weight of the emulsion paint.
  • solvents and / or dispersants may be added to the dispersion paint of the invention as needed.
  • the content of these other solvents and / or dispersants in the emulsion paint can basically be chosen freely. According to a first preferred
  • Embodiment of the present invention it is preferably in the range of 1, 0 wt .-% to 20.0 wt .-%, in particular 3.0 wt .-% to 15.0 wt .-%, each based on the total weight of the emulsion paint ,
  • the content of further solvents and / or dispersants in the emulsion paint is less than 5.0% by weight, preferably less than 2.5% by weight, more preferably less than 1.0% by weight. %, suitably less than 0.5 wt .-%, in particular less than 0.1 wt .-%.
  • the emulsion paint contains no further solvents and / or dispersants.
  • the dispersion paint according to the invention expediently contains at least one binder, preferably at least one organic binder and / or at least one inorganic binder, in particular at least one organic binder.
  • Binder in the context of the present invention refers to products which combine the same or different materials.
  • the setting is preferably carried out by physically drying the emulsion paint.
  • Organic binders refer to the
  • Chalcogenides e.g., CO, CO2, CS2
  • their derivatives e.g., H2CO3, KSCN
  • salt and metallic carbides e.g., H2CO3, KSCN
  • salt and metallic carbides e.g., H2CO3, KSCN
  • Chalcogenides eg CO, CO2, CS2
  • H2CO3, KSCN the salt-like and metallic carbides as well as the metal carbonyls all Carbon-free compounds and the chemical elements including carbon and fullerene.
  • Binders comprise plastic dispersions which preferably contain suspensions of finely divided 0.1 to a few ⁇ m polymer particles in water.
  • the solids content is preferably 40% to 60%.
  • Protective colloids may include binder properties, in particular rheology, storage stability, minimum film forming temperature (MFT), water absorption, chalking, alkali and saponification resistance, and
  • Pigment binding capacity can be adjusted. Furthermore, in particular for
  • binders include vinyl acetate homopolymers, vinyl acetate-acrylate copolymers, vinyl acetate-ethylene copolymers, vinyl acetate-maleate copolymers, vinyl acetate-versatate copolymers, vinyl acetate-versatate-acrylate copolymers, vinyl acetate-vinyl chloride-ethene copolymers, vinyl propionate copolymers. Homopolymers, vinyl propionate-acrylate copolymers, styrene-acrylate copolymers and acrylate homopolymers, copolymers and terpolymers.
  • the binder content of the emulsion paint can basically be chosen freely. It is preferably in the range of 0.5% by weight to 30.0% by weight, preferably in the range of 0.5% by weight to 17.5% by weight, particularly preferably in the range of 0.5 Wt .-% to 10.0 wt .-%. For particularly preferred
  • the binder content is in the range of 0.5 wt .-% to 1, 5 wt .-%, each based on the
  • the binder content is in the range of 2.0 wt .-% to 3.0 wt .-%, each based on the
  • the binder content is in the range of 4.5 wt .-% to 6.0 wt .-%, each based on the
  • Wall paints especially for scrub resistant interior paints, is the
  • Binder content in the range of 5.0 wt .-% to 8.0 wt .-%, each based on the total weight of the emulsion paint.
  • the binder content is in the range from 5.0% by weight to 7.0% by weight, based in each case on the Total weight of the emulsion paint.
  • Wall paints especially for scrub resistant interior paints, is the
  • Binder content in the range of 6.0 wt .-% to 9.0 wt .-%, each based on the total weight of the emulsion paint.
  • the emulsion paint according to the invention contains at least spray-dried calcium carbonate particles.
  • the amount of the spray-dried calcium carbonate particles in the dispersion paint can basically be chosen freely. It is preferably in the range from> 0.0% by weight to 50.0% by weight, preferably in the range from 1.0% by weight to 30.0% by weight, particularly preferably in the range from 3, 0% to 25.0% by weight.
  • the amount of the spray-dried calcium carbonate particles in the dispersion paint can basically be chosen freely. It is preferably in the range from> 0.0% by weight to 50.0% by weight, preferably in the range from 1.0% by weight to 30.0% by weight, particularly preferably in the range from 3, 0% to 25.0% by weight.
  • Wall paints especially for smudge-resistant interior paints, the amount of spray-dried calcium carbonate particles in the range of 4.0 wt .-% to 12.0 wt .-%, each based on the total weight of the emulsion paint.
  • the amount of spray-dried calcium carbonate particles in the range of 4.0 wt .-% to 12.0 wt .-%, each based on the total weight of the emulsion paint.
  • the amount of the spray-dried calcium carbonate particles is in the range of 6.0 wt .-% to 15.0 wt .-%, each based on the
  • Wall paints especially for wash-resistant interior paints, the amount of spray-dried calcium carbonate particles in the range of 8.0 wt .-% to 24.0 wt .-%, each based on the total weight of the emulsion paint.
  • the amount of spray-dried calcium carbonate particles is in the range from 8.0% by weight to 18.0% by weight, based in each case on the
  • Wall paints especially for wash-resistant interior paints, the amount of spray-dried calcium carbonate particles in the range of 8.0 wt .-% to 15.0 wt .-%, each based on the total weight of the emulsion paint.
  • the amount of spray-dried calcium carbonate particles is in the range from 8.0% by weight to 12.0% by weight, based in each case on the
  • peel-resistant interior paints suitably have a wet abrasion resistance according to DIN EN 13300, paragraph 5.4, class 5
  • Thickness decrease of the layer> 70 pm at 40 rubbing cycles preferably according to DIN EN 13300, paragraph 5.4, class 4 (thickness decrease of the layer ⁇ 70 pm at 40 scrubbing cycles), to "wash-resistant interior paints" according to the invention suitably a wet abrasion resistance according to DIN EN 13300, paragraph 5.4, class 3 (thickness decrease of the layer> 20 mm and ⁇ 70 mm at 200
  • abrasion resistant interior paints suitably have a wet abrasion resistance according to DIN EN 13300, paragraph 5.4, class 2 (thickness decrease of the layer> 5 mm and ⁇ 20 mm at 200
  • Scouring cycles preferably according to DIN EN 13300, paragraph 5.4, class 1
  • the emulsion paint according to the invention preferably contains further colorants, in particular pigments and / or dyes.
  • Colorants in this context designate all colorants, in particular inorganic or organic, natural or synthetic colorants.
  • the inorganic colorants include pigments which may also have filler character.
  • the organic colorants include both pigments and dyes.
  • the most important white pigment is titanium dioxide, as it has the highest light scattering power. It is expediently prepared as rutile or as anatase, which according to the invention, however, plays only a minor role.
  • the colorant content of the emulsion paint can basically be chosen freely. It is preferably in the range from 0.0 wt .-% to 30.0 wt .-%, in particular 1, 0 to 25.0 wt .-%, each based on the total weight of the emulsion paint.
  • a significant advantage of the present invention is the fact that compared with conventional emulsion paints the same color effect can be achieved with less colorants, in particular with less titanium dioxide.
  • the emulsion paint contains, in each case based on it
  • Total weight preferably less than 30.0 wt .-%, preferably less than 25.0 wt .-%, in particular less than 5.0 wt .-% of spray-dried calcium carbonate particles different colorants, in particular titanium dioxide.
  • the titanium dioxide content is in the range from 1, 0 wt .-% to 2.0 wt .-%, each based on the total weight of the emulsion paint.
  • the titanium dioxide content is in the range from 1, 0 wt .-% to 4.0 wt .-%, each based on the total weight of the emulsion paint.
  • the titanium dioxide content is in the range from 3.0% by weight to 8.0% by weight, based in each case on the
  • Total weight of the emulsion paint is the
  • Titanium dioxide content in the range of 8.0 wt .-% to 12.0 wt .-%, each based on the total weight of the emulsion paint.
  • the titanium dioxide content is in the range from 10.0% by weight to 15.0% by weight, based in each case on the
  • Wall paints especially for scrub resistant interior paints, is the
  • Titanium dioxide content in the range of 15.0 wt .-% to 20.0 wt .-%, each based on the total weight of the emulsion paint.
  • Fillers of various types of grinding and brightness can further increase the volume of the emulsion paint and further improve the technical and optical properties of the emulsion paint.
  • Fillers preferred according to the invention include ground (natural) calcium carbonate (most preferred filler, GCC); precipitated but not spray-dried calcium carbonate (increases brightness and hiding power in paints, reduces the consumption of T1O 2 );
  • Diatomaceous earth amorphous silica with irregular particle shape, matting
  • Kaolin aluminum silicate, improves surface smoothness
  • Mica potassium aluminum silicate; wet grinding lamellar structure, thus crack-reducing, matting, weatherproof
  • Talc magnesium silicate, matt
  • Barium sulfate high brightness, increases gloss, chemically inert
  • the optical properties of the pigments and fillers are preferably determined by the difference in the refractive indices between the surrounding medium and the pigment or filler. The larger this difference, the greater the hiding power. Substances whose refractive indices are greater than 1.7 are commonly referred to as white pigments.
  • Additives are added preferably only in a small amount of 0.2 to 2% in the emulsion paints according to the invention.
  • the following additives are used:
  • modified cellulose ethers of very different molecular weights.
  • synthetic thickeners in particular polyacrylate or polyurethane-based, are particularly preferred.
  • layered silicates such as LAPONITE as
  • Thixotropic agents particularly advantageous (solid color, structural colors).
  • wetting and dispersing agents preferably bring about the best possible distribution of the solids in the liquid phase.
  • wetting and dispersing agents preferably bring about the best possible distribution of the solids in the liquid phase.
  • Film-forming aids preferably enable plastic dispersions of higher minimum film-forming temperature (MFT) by external plasticization
  • Defoamers preferably minimize foaming during the process
  • foam bubbles may be e.g. the
  • Preservatives preferably prevent infestation of both the paint and the finished paint by bacteria, fungi and algae.
  • wax emulsions examples include wax emulsions, silicone emulsions and hollow spheres (inorganic, organic).
  • the amount of fillers (spray-dried calcium carbonate, further fillers and additives) in the emulsion paint can basically be chosen freely. It is preferably in the range of> 0.0% by weight to 70.0% by weight, preferably in the range of 5.0 to 66.0% by weight, particularly preferably in the range of 20.0% by weight. % to 66.0% by weight.
  • the amount of fillers is in the range from 60.0% by weight to 66.0% by weight, in each case based on the total weight of the
  • Emulsion paint for further particularly preferred wall paints, in particular for wash-resistant interior paints, the amount of fillers is in the range of 56.0 wt .-% to 62.0 wt .-%, each based on the total weight of
  • Emulsion paint for further particularly preferred wall paints, in particular for wash-resistant interior paints, the amount of fillers is in the range from 52.0% by weight to 56.0% by weight, in each case based on the total weight of the
  • the amount of fillers is in the range from 45.0% by weight to 52.0% by weight, in each case based on the total weight of the emulsion paint.
  • the amount of fillers is in the range of 40.0 wt .-% to 48.0 wt .-%, each based on the total weight of Emulsion paint.
  • the amount of fillers is in the range from 22.0% by weight to 30.0% by weight, in each case based on the total weight of the emulsion paint.
  • the emulsion paint contains calcium carbonate particles which have been obtained by spray-drying a precipitated calcium carbonate suspension.
  • Precipitated Calcium Carbonate refers to synthetic calcium carbonate - in contrast to GCC (ground calcium carbonate), "ground (natural) calcium carbonate”).
  • GCC ground calcium carbonate
  • PCC can be made in several ways. Known processes include precipitation with carbon dioxide, the lime-soda process and the Solvay process, in which PCC is a by-product of ammonia production.
  • the precipitation with carbon dioxide is particularly preferred according to the invention.
  • quicklime is first quenched to calcium hydroxide (lime) and then fed as a suspension to the reaction vessel. There carbon dioxide is introduced until the calcium hydroxide is completely converted to calcium carbonate.
  • the reaction time can be assessed and controlled by the course of the pH.
  • the pH of the reaction mixture is preferably less than 9.0, preferably less than 8.0, and is suitably in the range from 6.5 to 7.5.
  • the precipitation is preferably carried out at a solids content of 10 wt .-% to 20.0 wt .-%.
  • the rhombohedral or scalenohedral crystal form is preferred.
  • calcium carbonate is produced as a by-product in the preparation of the caustic alkalis sodium hydroxide and potassium hydroxide.
  • the specific surface area of the calcium carbonate to be spray-dried is preferably greater than 5 m 2 / g, preferably greater than 15 m 2 / g, particularly preferably greater than 25 m 2 / g, advantageously greater than 35 m 2 / g, in particular greater than 40 m 2 / g.
  • the mean particle size dso% of the calcium carbonate to be spray-dried is preferably greater than 0.2 ⁇ m, preferably greater than 0.5 ⁇ m, in particular at least 1.0 ⁇ m. On the other hand, it is preferably less than 3.0 ⁇ m, preferably less than 2.5 ⁇ m, in particular less than 2.0 ⁇ m.
  • the mean particle size dso% of the calcium carbonate to be spray-dried is in the range of greater than 0.2 ⁇ m to less than 3.0 ⁇ m, preferably in the range of greater than 0.5 ⁇ m to less than 2.5 ⁇ m, in particular in the range of at least 1, 0 pm to less than 2.0 pm.
  • the particle size is preferably determined by sedimentation analysis, conveniently using the Sedigraph 5100 (Micromeritics GmbH).
  • the calcium carbonate to be spray-dried is preferably calcitic calcium carbonate.
  • calcitic calcium carbonate is preferably calcitic calcium carbonate.
  • X-ray diffraction with an internal standard, preferably aluminum oxide, in conjunction with a Rietveld refinement has proved to be particularly suitable for determining the crystalline fractions.
  • scalenohedral and rhombohedral, in particular rhombohedral, calcium carbonate particles have proven particularly useful.
  • the spray-drying of the suspension of the precipitated calcium carbonate particles can be carried out in a manner known per se. First, preferably the
  • the suspension comprises, based on its total weight, at least 5.0% by weight, preferably at least 10.0% by weight, in particular at least 15.0% by weight, of precipitated calcium carbonate particles. Furthermore, the suspension comprises
  • the water content is the
  • Suspension based on their total weight, preferably at least 65.0 wt .-%, preferably at least 75.0 wt .-%, in particular at least 85% by weight.
  • the suspension may contain other additives whose content is preferably as low as possible.
  • the content of further additives, based on the total weight of the suspension is therefore preferably less than 25.0% by weight, preferably less than 10.0% by weight, more preferably less than 5.0% by weight, advantageously less than 1, 0 wt .-%, in particular less than 0.5% by weight.
  • the spray-to-be-dried suspension contains no inorganic binder.
  • the smallest possible proportion by weight of organic binder, based on PCC, is sought in the spray-to-be-dried suspension, which is advantageously less than 20.0% by weight, preferably less than 15.0% by weight, more preferably less than 10.0% by weight. %, in particular less than 5.0 wt .-% is.
  • the spray-drying suspension contains no inorganic
  • the suspension to be dried is preferably converted into a spray. This enormously increases the total surface area of the suspension.
  • the spray is preferably introduced into a stream of hot gas, whereby due to the large surface in a very short time the liquid dries convectively to a fine powder.
  • the hot gas is preferably air.
  • the inlet temperature of the hot gas is preferably in the range of 125 ° C to 500 ° C, preferably in the range of 2O0 ° C to 350 ° C, in particular in the range of 250 ° C to 300 ° C.
  • the outlet temperature of the hot gas is preferably in the range of 25 ° C to 300 ° C, preferably in the range of 50 ° C to 200 ° C, in particular in the range of 100 ° C to 150 ° C.
  • the spray concentration of the PCC is preferably selected in the range of 1% to 40%, preferably in the range of 5% to 25%, in particular in the range of 7.5% to 15%.
  • the resulting powdered material to be dried is expediently separated from the air stream by a cyclone separator.
  • the spray dryer is preferably operated continuously.
  • the spray-dried calcium carbonate particles preferably have a ratio of BET specific surface area to average
  • Particle size dso% greater than 6 m 2 / (gm), preferably greater than 7 m 2 / (gm),
  • the spray-dried calcium carbonate particles preferably have a ratio BET surface area to average particle size dso% less than 200 m 2 / (gmm), preferably less than 150 m 2 / (g pm), advantageously less than 125 m 2 / (gmm), conveniently less than 112 m 2 / (gmm), even more preferably less than 110 m 2 / (gm), most preferably less than 100 m 2 / (gm), in particular less than 95 m 2 / (gm).
  • the PVK is in the range of 25% to 99%, preferably in the range of 40% to 99%, in particular in the range of 62% to 98%.
  • the PVC is in the range from 93.0% by weight to 98.0% by weight, in each case based on the total weight of the emulsion paint.
  • the PVC is in the range from 80.0% by weight to 92.0% by weight, in each case based on the total weight of the emulsion paint.
  • the PVC is in the range from 78.0% by weight to 83.0% by weight, in each case based on the total weight of the emulsion paint.
  • the PVC is in the range from 74.0% by weight to 76.0% by weight, in each case based on the total weight of the emulsion paint.
  • the PVK is in the range from 68.0% by weight to 72.0% by weight, in each case based on the
  • PVK is in the range of 62.0 wt .-% to 70.0 wt .-%, each based on the
  • the paint obtained by applying the emulsion paint has a comparatively low sheen (gloss at 85 °).
  • the sheen is preferably less than 10, preferably less than 5, particularly preferably less than 4,
  • the abrasiveness and wet abrasion of the paint obtainable by applying the emulsion paint is very low.
  • the wet abrasion is
  • the paint obtainable by applying the emulsion paint has a sufficient hiding power (contrast ratio, KV).
  • the hiding power is preferably at least 92.0%, preferably greater than 95.0%, particularly preferably greater than 97.0%, very particularly preferably greater than 97.3%, in particular greater than 97.5%.
  • the white value R 457 of the powder obtainable by application of the emulsion paint
  • Paint is preferably greater than 89.0, preferably greater than 90.0, in particular greater than 90.3.
  • a portion of the resulting suspension is oven dried at 130 ° C for the Comparative Examples and ground or concentrated by filtration to a slurry.
  • Part of the product from step 1 is ground.
  • Table 4 shows the materials investigated here.
  • the crystal modification was determined by X-ray diffraction.
  • the BET specific surface area was measured according to DIN-ISO 9277.
  • the particle size d50% was determined by Sedigraph. 3.
  • step 2 Add ammonia and wetting agent and disperse for 3 min at 1865 rpm (step 2)
  • step 2 Place the stainless steel cup on the balance and weigh in the binder, defoamer and biocide 8. Stir everything with the spatula, then disperse for 2 min at 1865 rpm (step 2)
  • Electromotive film applicator (Erichsen, Coatmaster 509 / MC-I)
  • contrast card Leneta For hiding power: contrast card Leneta, form 14H coat;
  • the paint to be tested is applied to a film with a film applicator of a defined thickness. After drying, the coated film is subjected to 200 rubbing cycles in a scrub tester and the layer thickness loss is calculated in microns.
  • Washing liquid (2.5 g / L sodium n-dodecylbenzenesulfonate in E water)
  • Mass loss mass before rubbing - mass after scrubbing.3 Determination of dry film density
  • the thickness of the uncoated sample sheet is determined to be accurate to 1pm. From a coated sample foil, a piece of 100 mm ⁇ 100 mm is produced by means of a template and the mass is determined exactly to 1 mg.
  • the thickness of the coated sample film is determined to be accurate to 1 pm 5.
  • the dry film density is determined according to the following formula: p dry film density
  • the layer thickness loss is calculated:
  • Contrast ratio (%) RYb / RYw * 100

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne une peinture dispersion comprenant au moins de l'eau et des particules de carbonate de calcium, les particules de carbonate de calcium ayant été obtenues par séchage par atomisation d'une suspension de particules de carbonate de calcium précipitées. Cette peinture dispersion peut être utilisée en particulier comme peinture murale d'intérieur ou d'extérieur.
PCT/EP2019/000006 2018-01-16 2019-01-10 Peinture dispersion WO2019141502A1 (fr)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992314A (en) 1974-09-27 1976-11-16 The Procter & Gamble Company Process for the preparation of spray-dried calcium carbonate-containing granules
DE10318143A1 (de) * 2003-03-08 2004-09-23 Brillux Gmbh & Co. Kg Beschichtungsmittel mit Farbumschlag
US20100263576A1 (en) 2005-03-31 2010-10-21 Imerys Kaolin, Inc. Aggregated particulate minerals, compositions comprising aggregated calcium carbonate, methods of making and uses thereof
WO2013050495A1 (fr) 2011-10-05 2013-04-11 Solvay Sa Particules de carbonate de calcium précipitées et leur utilisation
EP2796412A1 (fr) 2013-04-24 2014-10-29 Università Del Salento - Dipartimento Di Ingegneria Dell'Innovazione Synthèse de nanoparticules de CaCO3 par séchage par pulvérisation
WO2014202836A1 (fr) 2013-06-20 2014-12-24 Fp-Pigments Oy Composition de carbonate de calcium précipité, procédé pour sa préparation et utilisations correspondantes
EP3018174A1 (fr) * 2014-11-07 2016-05-11 Omya International AG Procédé pour la fabrication d'une suspension comprenant un matériau contenant du carbonate de calcium
WO2016115386A1 (fr) * 2015-01-14 2016-07-21 Imerys Pigments, Inc. Procédé commandé servant à faire précipiter le carbonate de calcium
DE102016002221A1 (de) * 2016-02-26 2017-08-31 Brillux Gmbh & Co. Kg Dispersionsfarbe

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992314A (en) 1974-09-27 1976-11-16 The Procter & Gamble Company Process for the preparation of spray-dried calcium carbonate-containing granules
DE10318143A1 (de) * 2003-03-08 2004-09-23 Brillux Gmbh & Co. Kg Beschichtungsmittel mit Farbumschlag
US20100263576A1 (en) 2005-03-31 2010-10-21 Imerys Kaolin, Inc. Aggregated particulate minerals, compositions comprising aggregated calcium carbonate, methods of making and uses thereof
WO2013050495A1 (fr) 2011-10-05 2013-04-11 Solvay Sa Particules de carbonate de calcium précipitées et leur utilisation
EP2796412A1 (fr) 2013-04-24 2014-10-29 Università Del Salento - Dipartimento Di Ingegneria Dell'Innovazione Synthèse de nanoparticules de CaCO3 par séchage par pulvérisation
WO2014202836A1 (fr) 2013-06-20 2014-12-24 Fp-Pigments Oy Composition de carbonate de calcium précipité, procédé pour sa préparation et utilisations correspondantes
EP3018174A1 (fr) * 2014-11-07 2016-05-11 Omya International AG Procédé pour la fabrication d'une suspension comprenant un matériau contenant du carbonate de calcium
WO2016115386A1 (fr) * 2015-01-14 2016-07-21 Imerys Pigments, Inc. Procédé commandé servant à faire précipiter le carbonate de calcium
DE102016002221A1 (de) * 2016-02-26 2017-08-31 Brillux Gmbh & Co. Kg Dispersionsfarbe

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ECKARD AMELINGMEIER: "Römpp-Lexikon Chemie", vol. 3, 1997, HRSG. JÜRGEN FALBE, pages: 10
V. VERGARO ET AL.: "AIP Conference Proceedings", vol. 1667, 2015, article "Synthesis of calcium carbonate nanocrystals and their potential application as vessels for drug delivery", pages: 020014

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