The present invention relates to composites, comprising inorganic and/or organic pigments and/or fillers in the form of microparticles, the surface of which is coated at least partially with finely divided nano-dolomite with the help of binders based on copolymers comprising as monomers one or more
The present invention relates to composites, comprising inorganic and/or organic pigments and/or fillers in the form of microparticles, the surface of which is coated at least partially with finely divided nano-dolomite with the help of binders based on copolymers comprising as monomers one or more dicarboxylic acids and one or more monomers from the group of diamines, triamines, dialkanolamines or trialkanolamines, a method for producing such composites, aqueous slurries thereof, their use, and the use of the inventive binders for coating the microparticles with nano-dolomite.
대표청구항▼
1. A composite comprising: (i) 20 to 80 wt. %, based on the total dry weight of the composite, of microparticles having a spherical equivalent diameter of 0.3 μm to 12 μm, wherein the microparticles are organic microparticles comprising polyethylene, polypropylene, polyethylene terephthalate, polyst
1. A composite comprising: (i) 20 to 80 wt. %, based on the total dry weight of the composite, of microparticles having a spherical equivalent diameter of 0.3 μm to 12 μm, wherein the microparticles are organic microparticles comprising polyethylene, polypropylene, polyethylene terephthalate, polystyrene or any mixture thereof, and wherein the microparticles have a spherical structure, a hollow spherical structure, or a hollow hemispherical structure;(ii) 80 to 20 wt. %, based on the total dry weight of the composite, of a dolomite nanoparticle composition at least partially coating the microparticles, wherein ≥90% of particles of the dolomite nanoparticle composition, based on the number N of particles, have a spherical equivalent diameter of 20 nm to 200 nm, wherein the dolomite nanoparticle composition is ground natural dolomite that is ground in the presence of one or more grinding aids and/or dispersants, and wherein the dolomite nanoparticle composition contains more than 90% dolomite and one or more grinding aids and/or dispersants;(iii) 0.3 to 3 wt. %, based on the total dry weight of the composite, of a binder that facilitates adhesion of the microparticles with the dolomite nanoparticle composition, wherein the binder is a copolymer comprising one or more dicarboxylic acids, and one or more diamines, triamines, dialkanolamines or trialkanolamines, and(iv) optionally one or more additional dispersants,wherein the sum of the weight amounts of the microparticles, the dolomite nanoparticle composition, the binder, and grinding aids and/or dispersants is 100% of the composite. 2. The composite according to claim 1, wherein the microparticles have an essentially spherical structure. 3. The composite according to claim 1, wherein the microparticles have a hollow spherical or hollow hemispherical structure. 4. The composite according to claim 1, wherein the spherical equivalent diameter of the organic microparticles is 0.9 μm to 1.1 μm. 5. The composite according to claim 1, wherein the spherical equivalent diameter of the organic microparticles is 0.7 μm to 1.4 μm. 6. The composite according to claim 1, wherein the spherical equivalent diameter of the organic microparticles is 0.4 μm to 1.5 μm. 7. The composite according to claim 1, wherein the organic microparticles comprise polystyrene. 8. The composite according to claim 1, wherein the organic microparticles are in the form of polystyrene hollow spheres with a spherical equivalent diameter of 0.3 μm to 2.0 μm. 9. The composite according to claim 1, wherein the dolomite nanoparticle composition contains more than 98 wt % dolomite mineral. 10. The composite according to claim 1, wherein 92 to 99% of particles of the dolomite nanoparticle composition, based on the amount N of particles, have a spherical equivalent diameter in a range from 20 to 200 nm. 11. The composite according to claim 1, wherein the dolomite is ground to the spherical equivalent diameter in one or more dry or wet grinding steps. 12. The composite according to claim 11, wherein a ball mill, a jet plate mill, an attritor mill or combinations of such mills or combinations of one or more of such mills with a cyclone and screen is/are used for the grinding. 13. The composite according to claim 11, wherein the dry grinding is performed in a ball mill using iron and/or porcelain balls with a diameter of 0.5 to 10 cm. 14. The composite according to claim 11, wherein the dry grinding is performed in a ball mill using iron-cylpebs with a diameter of 2.5 cm. 15. The composite according to claim 11, wherein the wet grinding is performed in an attritor mill using grinding balls made of zirconium silicate, zirconium dioxide and/or baddeleite with a diameter of 0.2 to 5 mm. 16. The composite according to claim 11, wherein the wet grinding is performed in an attritor mill using grinding balls made of zirconium silicate, zirconium dioxide and/or baddeleite with a diameter of 0.2 to 2 mm. 17. The composite according to claim 11, wherein the wet grinding is performed in an attritor mill using grinding balls made of zirconium silicate, zirconium dioxide and/or baddeleite with a diameter of 0.5 to 5 mm. 18. The composite according to claim 11, wherein the wet grinding is performed in an attritor mill using grinding balls made of zirconium silicate, zirconium dioxide and/or baddeleite with a diameter of 0.5 to 2 mm. 19. The composite according to claim 1, wherein the natural ground dolomite is dispersed and/or ground in the form of an aqueous slurry with a dolomite solids content of more than 10 wt %. 20. The composite according to claim 1, wherein the natural dolomite is dispersed and/or ground in the form of an aqueous slurry with a dolomite solids content of more than 15 to 30 wt %. 21. The composite according to claim 1, wherein the natural ground dolomite is dispersed and/or ground in the form of an aqueous slurry with a dolomite solids content of 72 to 80 wt %. 22. The composite according to claim 1, wherein the dolomite dispersed and/or ground in the form of an aqueous slurry with a dolomite solids content of ≤60 wt %, is physically concentrated by filter pressing and/or centrifuging and/or thermally, or by combinations of mechanical and thermal concentration steps, optionally dispersed in the presence of one or more dispersants, to a final concentration of between 60 wt % and 78 wt %. 23. The composite according to claim 1, wherein the dolomite dispersed and/or ground in the form of an aqueous slurry with a dolomite solids content of ≤60 wt %, is physically concentrated by filter pressing and/or centrifuging and/or thermally, or by combinations of mechanical and thermal concentration steps, optionally dispersed in the presence of one or more dispersants, to a final concentration of 66±2 wt %. 24. The composite according to claim 1, wherein the grinding aids and/or dispersants are anionic grinding aids and/or dispersants. 25. The composite according to claim 24, wherein the anionic grinding aids and/or dispersants comprise homopolymers or copolymers of polycarboxylic acid salts based on acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid or mixtures thereof, or sodium polyphosphates, sodium citrate or mixtures thereof. 26. The composite according to claim 25, wherein the homopolymers or copolymers of polycarboxylic acid salts are partially or completely neutralized with sodium, lithium, potassium, ammonium, calcium, magnesium, strontium and/or aluminium or mixtures thereof. 27. The composite according to claim 25, wherein the homopolymers or copolymers of polycarboxylic acid salts are partially or completely neutralized with sodium and magnesium. 28. The composite according to claim 1, wherein the dispersants and/or grinding aids are used in wet grinding in an amount of about 0.05 to about 2 wt %. 29. The composite according to claim 1, wherein the viscosity of the dolomite slurry in wet grinding is less than 2500 mPa s. 30. The composite according to claim 1, wherein the viscosity of the dolomite slurry in wet grinding is in the range of 50 to 250 mPa s. 31. The composite according to claim 1, wherein the grinding aids and/or dispersants comprise a glycol, a polyglycol, a polyethylene glycol, an ethylene oxide-propylene oxide-ethylene oxide block copolymer, an alkanolamine, triethanolamine, triisopropanolamine or mixtures thereof. 32. The composite according to claim 1, wherein the dispersants and/or grinding aids in dry grinding are present in an amount of 0.2 to 1 mg/m2 nanoparticle surface area. 33. The composite according to claim 1, containing 25 to 75 wt % of microparticles, based on the total dry weight of the composite. 34. The composite according to claim 1, containing 75 to 25 wt % of dolomite particles, based on the total dry weight of the composite. 35. The composite according to claim 1, wherein one or more saturated or unsaturated, branched or unbranched C2 to C10 dicarboxylic acid, C3 to C9 dicarboxylic acid, C4 to C8 dicarboxylic acid, C5 to C7 dicarboxylic acid, or adipic acid is used as one or more dicarboxylic acid monomers of the binder. 36. The composite according to claim 1, wherein one or more linear and branched chain, substituted and unsubstituted diamine and triamine and dialkanolamine and trialkanolamine, N-(2-aminoethyl)-1,2-ethanediamine, diethanolamine, an N-alkyldialkanolamine, N-methyl- and N-ethyldiethanolamine and triethanolamine is used as the one or more diamine, triamine, dialkanolamine or trialkanolamine monomer of the binder. 37. The composite according to claim 1, the copolymer used as the binder is crosslinked with epichlorohydrin. 38. The composite according to claim 1, wherein the binder is a copolymer of adipic acid with N-(2-aminoethyl)-1,2-ethane-diamine and epichlorohydrin. 39. The composite according to claim 1, containing 0.5 to 3 wt % of binder, based on the total dry weight of the composite. 40. An aqueous slurry comprising the composite according to claim 1. 41. A filler or pigment comprising the composite according to claim 1 or an aqueous slurry thereof. 42. Paper comprising the composite of claim 1 or an aqueous slurry thereof in an amount of 0.5 to 50 wt %, based on the total weight of the paper. 43. The paper according to claim 42, wherein the composite is used in the pre-coating, the intermediate coating, the top coating and/or a single coating, and the paper is coated on one or both sides and one or more of the coatings contains the composite on one or both sides. 44. The paper according to claim 42, wherein the composite is used in calendered or uncalendered paper. 45. The paper according to claim 42, wherein the composite is used for modifying for controlling the pore volume of the paper or the coating. 46. A paints, plastic or sealing compound comprising the composite according to claim 1 or an aqueous slurry thereof. 47. Paper comprising the composite of claim 1 or an aqueous slurry thereof as a coating in an amount of 2 to 50 wt % per side of paper. 48. A filtration aid in the form of a filter layer comprising the composite according to claim 1 or an aqueous slurry thereof, optionally on a natural and/or synthetic carrier material such as cotton, cellulose and polyamide fibres. 49. A filtration aid comprising the composite according to claim 1 or an aqueous slurry thereof. 50. A filler comprising the composite according to claim 1 or an aqueous slurry thereof. 51. A pigment comprising the composite according to claim 1 or an aqueous slurry thereof. 52. A coating colour comprising the composite of claim 1 or an aqueous slurry thereof. 53. The coating colour according to claim 52, wherein the coating colour has a solids content of 25 to 75 wt % solids. 54. The coating colour according to claim 52, wherein the amount of the composite, based on the total solids content in the coating colour, is 3 to 97 wt %.
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