MXPA01004870A - Preparation containing gypsum from flue gas desulphurisation, method for using the same and use thereof - Google Patents

Abstract

The present invention relates to a preparation containing a water-soluble polymer or a water-dispersible polymer, or a mixture of the two or more, and at least one filler that may consist of gypsum particles from flue gas desulphurisation (REA-gypsum particles), wherein said particles have a particular-size distribution value x50 of between 13 and 500&mgr;m. This invention also relates to a method for producing such a preparation as well as to the use thereof.

Description

PREPARATION CONTAINING PLASTER FROM THE DESULFURATION OF COMBUSTIBLE GASES, METHOD FOR USING AND USING THE GAS This invention relates to a preparation containing a water soluble polymer or a water dispersible polymer or a mixture of two or more thereof and gypsum particles from waste gas desulphurisation plants (WDP gypsum) as a value for the particle size distribution x50 from 13 to 500 μm, for a process for its production and for its use. Inorganic inert fillers and polymeric materials are often used in admixture with one another. Depending on the weight ratio of filler to polymeric material, properties may be attributed to the final product obtainable from such a mixture that would be very difficult and even impossible to achieve using the material consisting of only one of the components of the mixture. (ie, only polymer or only filler).

The combination of inorganic inert filler and polymers is often intended and is not used in any way because both materials have very different property profiles of which the combination is not only desirable but actually necessary for many applications. Fillers that generally consist of a number of individual loose filler particles are often chemically inert around them. Because of this, the filler particles can often only be ordered / formed together with a binder. Suitable binders are, for example, organic and inorganic binders. An exception to this are fillers that are able to adjust to form solid materials by reacting with a reactant present in the surrounding environment. Examples of such fillers are gypsum in the form of anhydrite and various lime compounds which are capable of curing by reacting with water or carbon dioxide from the surrounding air. While the aforementioned self-adjusting fillers generally cure to form brittle hard materials, a distinctly broader spectrum of physical and chemical properties can often be achieved by replacing the inorganic materials with polymers. However, the disadvantages of using polymers only generally include increased production costs as compared to inorganic materials and their lower hardness and chemical resistance, particularly with respect to fire resistance and flame resistance. In this connection the construction supply industry in particular has a continually growing demand for new materials that combine the positive properties of fillers such as their chemical resistance, their resistance to heat, their availability in large quantities and their low price, with those of the polymers. The demand varies from surface coating compositions or adhesives, which are generally applied as a thin layer to the surface of various types, through coating and sealing compounds to plastics of the type used, for example, as a cable jacket. of power or as water conduits. For example, Wirsching, Hüller, Hofmann and Púrzer describe the use of DP gypsum fillings in ZKG INTERNATIONAL, No. 5, 1995 (Vol. 48), p. 241-256 (Bauverlag GmbH). The article in question describes in particular the use of WDP gypsum from power stations lit with carbon in adhesives, paints and plastics. Before being used as a filler, the gypsum is finely milled so that it has an average particle diameter of about 8 to 12 μm and the upper cut of the particle diameter is about 25 to 50 μm. JP 76-139114 relates to the use of WDP gypsum as a pigment in coating compositions. This document describes a composition of titanium dioxide, WDP gypsum, aluminum silicate, ethylene / vinyl acetate copolymer, polyvinyl acetate, thickener and water as a white emulsion which is suitable as a coating composition.

Polymeric materials containing fillers are commercially available and processed in the form of aqueous dispersions. Unfortunately, such materials often have serious disadvantages during and after processing. First, the viscosity of the dispersions can often not be adjusted to a suitable value for processing. Second, after processing and generally after drying, the polymeric material containing applied filler undergoes a different change in volume in relation to its volume at the time of application. This change in volume can often correspond to the extent that will be expected as a result of the evaporation of the water present in the dispersion. A behavior such as this (often referred to as "shrinkage" or "shrinkage") is undesirable, above all for polymer dispersions containing filler that are supposed to perform a "fill" function. Thus, in the case of surface coatings for example, importance is often attached to the leveling of any structural irregularities of the substrate. It is expected that the coating or sealing compounds, for example, fill the gap to be sealed or filled - even after drying of the introduced compound - to the full extent to which the dispersion was originally introduced.

In addition, shrinkage of the coating compounds frequently leads to the formation of cracks in the compound during the drying which, in addition to the generally noticeable visual disadvantages, frequently represent starting points for the penetration of corrosive compounds or moisture. As a result, the visual impression and stability of the region thus filled deteriorates frequently and drastically. Polymeric materials containing filler are frequently used as adhesives, more particularly emulsion-based adhesives. Unfortunately, many adhesives of this type lack elasticity which is often a disadvantage to the stability of the adhesive bond under tension. Now, the problem addressed by the invention was to remedy these disadvantages. This problem has been solved by a polymeric composition which, in addition to a water-soluble or water-dispersible polymer or a mixture of two or more such polymers, contains filler particles in the The form of gypsum particles from waste gas desulfurization plants of which the particle size distribution has an average diameter (x50) of about 13 to about 500 μm. Accordingly, the present invention relates to a preparation containing a water soluble polymer or a water dispersible polymer or a mixture of two or more thereof and filler particles, the filler particles being gypsum particles from of waste gas desulfurization plants (WDP gypsum) with a value for the x50 particle size distribution of 13 to 500 μm (as measured with a Sympatec Helos HO720 in isopropanol). In the context of the invention, a "preparation" is any mixture containing the aforementioned constituents. It can be a mixture that is ready in a form suitable for the contemplated application (for example already provided with an adequate amount of water) or which first has to be brought by the user into a form suitable for application, for example a powder dispersible in water. A "water-soluble polymer or water-dispersible polymer" in the context of the present invention is a polymer which, in the form of a mixture with water, forms a molecularly dispersed solution, a substantially stable gel or colloid or a substantially stable dispersion. . In the context of the present invention, it does not matter whether the stability of the. The aforementioned aqueous preparations derive from the polymer properties themselves or are supported by additives such as emulsifiers., stabilizers, gel formers or the like. The preparation according to the invention may contain, for example, only a certain water soluble polymer or a certain water dispersible polymer. However, the preparation may equally well contain a mixture of two or more water-soluble polymers or a mixture of two or more water-dispersible polymers. According to the invention, the preparation can also be a mixture of one or more water-soluble polymers and one or more water-dispersible polymers. The water solubility or self-dispersibility of the polymers can be based, for example, on the presence of anionic or cationic groups such as those normally present in polymers to achieve such an effect. Solubility or dispersibility in water can also be obtained by arranging nonionic groups on a polymer suitable for use according to the invention, these nonionic groups driving the water solubility or the water dispersibility of the polymer. Suitable cationic groups are, for example, quaternized amino groups; Suitable anionic groups are, in particular, acid groups. For example, water-soluble polymers obtainable by polymerization of monomeric constituents that impart water solubility to the polymers can be used for the purposes of the present invention. Such polymers include, for example, polymers of acrylic acid and polymers obtainable by polyaddition of alkylene oxide. Polymers that are "self-dispersible" in water are also suitable. It is understood that "self-dispersible polymers" are polymers that form a dispersion substantially stable in water without the addition of emulsifiers. In general, polymers such as these contain, for example, carboxylic acid groups, sulfonic acid groups, 4-phosphonic acid groups, or polyethylene oxide chain segments or a mixture of two or more of the functional groups mentioned as functional groups. Polymers that are neither water-soluble nor "self-dispersing" can be converted into an emulsion or dispersion substantially stable in water, using for example commercially available emulsifier or dispersant. Suitable polymers are, for example, polyurethanes, polyacrylates, polymethacrylates, esters of polyvinyl, polystyrene and sulfonated polystyrene, polybutadiene and sulfonated polybutadiene, polyamides, polyester, and polyvinyl chloride. Other suitable polymers are corresponding co- and ter-polymers, such as ethylene / vinyl acetate (EVA) copolymers, copolymers styrene / butadiene (SBR), styrene / acrylonitrile polymers (SAN), styrene / acrylate copolymers and the like. Another preferred embodiment is characterized by the use of, for example, polymers obtainable from the polymerization of acrylates or from the co- and ter-polymerization of acrylates with acrylonitrile, vinyl esters, maleates, acrylic acid, styrene and the like. Polymers such as these and the resulting polymer dispersions are comprehensively described, for example, in "Encyclopaedia of Plymer Science and Technology" (Editors: Mark, Bikales, Overberger, Menges, 2nd Editions, 1989, Wiley, New York, 17). , pp. 06-409). In another preferred embodiment, water-soluble or water-dispersible polymers or mixtures thereof already present in dissolved or dispersed form are used for production of the preparation according to the invention. These polymers are in particular aqueous dispersions of synthetic polymers of the type mentioned above, more particularly polyurethanes, poly (meth) acrylates, polyvinyl esters, polystyrene, polybutadiene, polyamides or polyvinyl chloride, or mixtures of two or more thereof. The corresponding co-and ter-polymers, styrene / butadiene, styrene / acrylates can also be used for the purposes of the present invention, such as natural latexes. The dispersions which can be used according to the invention can be prepared, for example, by suspension or emulsion polymerization of the corresponding monomers. Secondary dispersions obtainable by dispersing a molten polymer in a suitable medium can also be used. Preferably, polymer dispersions are used which are generally commercially available in large quantities as the result of suspension or emulsion polymerizations and which are used, for example, as binders for emulsion paints or emulsion-based adhesives (see, for example, Rumpop Chemie). Lexikon, Vol.2, Thieme-Verlag, 1990, pp. 1010-1011 and the literature cited therein) are preferably used. Unsaturated polymerizable radical compounds, such as acrylates and methacrylates, dienes or olefins, or mixtures of two or more of the mimes are particularly suitable as monomers for such polymer dispersions. Suspension or emulsion polymerization is described, for example, in "Ullmann's Enzyklopadie der technischen Chemie" (Vol.A21, 5th Edition, VCH, 1987), expressly referring to this reference literature. The polymer dispersions used in a preferred embodiment of the present invention are based on polyvinyl esters such as polyvinyl acetate, and co-and ter-polymers of vinyl esters with monomers, such as ethylene, acrylates or methacrylates or mono- and diesters of maleic acid, or mixtures of two or more thereof. Monomers that lead to dispersions suitable for use in accordance with the present invention are described, for example, in Ullmann's Enzyklopadie der technischen Chemie (Vol. A22, 1993, VCH, pp. 1-15). Dispersions prepared on the basis of such monomers are described, for example, in "Handbook of Additives" (3rd Edition, Chapman and Hall, pp. 381-399). Reference is expressly made herein to the references of cited literatures. Suitable polymers in a preferred embodiment are, for example, copolymers of vinyl acetate, vinyl propionate or VeoVa® 9 or 10 with other comonomers. VeoVa © 9 and 10 are vinyl esters of ter-carboxylic acids (Versatic® 9 or 10 acid) for copolymerization with, for example, vinyl acetate for emulsion paints, gypsum, concrete additives, coatings for paper and textiles , emulsion-based adhesives and paints (manufacturer: Deutsche Shell Chemie). Particularly suitable polymers are co- and ter-polymers containing vinyl acetate / dibutyl maleate, vinyl acetate / n-butyl acrylate, vinyl acetate / 2-ethylhexyl acrylate, vinyl acetate / n-butyl acrylate / N-hydroxymethyl acrylamide, vinyl acetate / crotonic acid, vinyl acetate / VeoVa® 10, vinyl acetate / VeoVa® 10 / acrylic acid, vinyl acetate / VeoVa® 10 / n-butyl acrylate, vinyl acetate / N -hydroxymethyl acrylamide, vinyl acetate / vinyl laurate, vinyl acetate / vinyl laurate / vinyl chloride, vinyl acetate / ethylene / vinyl chloride, vinyl acetate / ethylene / acrylate, vinyl acetate / ethylene / acrylamide, vinyl acetate / ethylene / N-hydroxymethyl acrylamide, vinyl propionate, vinyl propionate / vinyl chloride, vinyl propionate / tert-butyl acrylate, VeoVa® 10 / vinyl chloride, VeoVa® 10 / styrene / acrylate, VeoVa ® 10 / styrene / maleate, VeoVa® 10 / styrene / acrylate / maleate and VeoVa® 10 / VeoVa® 9 / meta Methyl Crylate / Butyl Acrylate, VeoVa® 10 being completely or partially replaceable by VeoVa® 9. Another preferred embodiment of the invention is characterized by the use of polymer dispersions based on poly (meth) acrylates and co- and ter-polymers of the (meth) acrylates with such monomers as acrylonitrile, vinyl esters, maleates, acrylic acid and styrene. Corresponding polymer dispersions are comprehensively described, for example, in "Emulsion Polymerisation and Emulsion Polymers" (1997), John Wiley, p. 619-655, New York) and are considered as part of the present description. Another preferred embodiment of the invention is characterized by the use of commercially available dispersions, such as from 345 (Manufacturer: Dow Latex) or Acronal® DS 3518 (Manufacturer: BASF AG).

Aqueous polymer dispersions based on conjugated dienes, such as chloroprene or butadiene, and copolymers of these dienes with unsaturated compounds, such as styrene or acrylonitrile, may also be used in accordance with the present invention. Such dispersions are known and described, for example, in "Emulsion Polymerization and Emulsion Polymers" (1997), John Wiley, pp. 521-561, New York). Reference is hereby specifically made to the cited literature reference. In addition to the aforementioned polymers, monomers with additional functional groups, such as N-methylol acrylamide, hydroxypropyl acrylate, (meth) acrylic acid or a mixture of two or more of the mentioned compounds, can be used to prepare the polymer dispersions usable according to with the invention The preparations according to the invention contain at least gypsum particles of WDP with a value for particle size distribution x50 of 13 to 500 μm (as measured with a Sympatec Helos H0720) as filler. The gypsum particles of WDP that differ in their dimensions are formed in different desulfurization plants of waste gas depending on the technical parameters. It has been found in accordance with the present invention that the advantages according to the invention can be obtained with gypsum particles of WDP having the aforementioned values for the particle size distribution. In general, various processes can be used to measure a particle size distribution and the corresponding value x50. Typical processes include, for example, the selection process where a certain amount of particles is selected through screens with different mesh widths. The total amount of particles is thus divided into fractions with different particle diameters of which the quantity is expressed as a percentage of the total weight of the particles investigated. Other methods for determining particle size distribution are, for example, light scattering and Fraunhofer diffraction. In the context of the present invention, the size distribution The particle size of the WDP gypsum particles was determined by the Fraunhofer diffraction technique using a Sympatec Helos H0720. The particle size distribution was measured on a suspension in isopropanol. The following particle size distribution data are based on the measurements by the aforementioned technique but are not restricted to such dimensions. The advantages according to the invention can be obtained with any particles of. plaster of WDP whose particle size distribution is mainly within the mentioned range, regardless of the measurement system.

In a preferred embodiment of the present invention, the gypsum particles of WDP have a lower limit than the particle size x50 of at least about 25μm. In another preferred embodiment, the value for the particle size distribution x50 is approximately 30 to 250 μm. Good results can be obtained, for example, where the values for the particle size distribution x50 are in the range of about 35 to about 200 or of the order of 150 μm. Another preferred embodiment of the invention is characterized by the use of WDP gypsum particles with an x50 value for the particle size distribution of from about 40 to about 120 μm, for example, in the range from about 60 to about 110 μm and more particularly in the range of from about 80 to about 100 μm. It has also been found to be advantageous for the filler particles to have a granular or rod-like shape. The plaster particles of WDP used as filler particles according to the invention show their advantages according to the invention even when they are used as the sole filler. In this case the gypsum particles of WDP with an x50 value for the particle size distribution in the range of about 13 to about 110 μm and more especially in the range of about 35 to about 80 μm are used in a preferred embodiment of the invention. In another preferred embodiment of the present invention, the gypsum particles of WDP are used in admixture with at least one other type of inorganic filler particles. In the context of the invention, the expression "another type" of inorganic filler particles attempts to encompass any filler particles that differ from the gypsum particles of WDP in their chemical composition, in their predominant spatial form (for example their crystalline form). ) or in a combination of two or more of the mentioned characteristics. In a preferred embodiment of the present invention, the filler particles differing at least in the x50 value from their particle size distribution from the value corresponding to the particle size distribution of the plaster particles of WDP are used as the other type of inorganic filler particles. Other suitable types of inorganic filler particles are, for example, any inorganic filler particles inert to the other substances present in the preparation according to the invention. As far as other types of inorganic filler particles are concerned, there are no restrictions on the x50 value for the particle size distribution. For example, filler particles with an x50 value for the particle size distribution in the range of about 0.01 to about 500 μm can be used in accordance with the present invention. Other suitable types of inorganic filler particles are, for example, filler particles of andalusite, sillimanite, kyanite, pyrophyllite, imigolite or allophane. Also suitable are compounds based on sodium aluminates or calcium and mineral silicates, such as silica, calcium sulfate (gypsum), which do not come from desulfurization plants of waste gas in the form of anhydrite, hemihydrate or dihydrate, silica flour. , silica gel, barium sulfate, titanium dioxide, zeolites, leucites, feldspar potash, biotite, the group of soro-, cyclo-, ino-, phyllo- and tectosilicates, the group of poorly soluble sulfates, such as gypsum, Anhydrite, heavy feldspar, and calcium minerals, such as calcite or chalk (CaC03). According to the invention, the aforementioned inorganic materials can be used individually as another type of inorganic filler particles. However, a mixture of 2 or more of the mentioned compounds can be used equally well. A preferred embodiment of the invention is characterized by the use of calcite, kaolin, dolomite, silica flour and gypsum (CaSÜ 2H20). In another preferred embodiment of the present invention, the filler particles of the other type have an x50 value for the average particle size distribution in the range of about 1 to about 120 μm, for example in the range of about 3 to about 60. μm or in the range of about 60 to about 90 μm. Organic filler particles that can not be readily assigned to water-soluble or water-dispersible polymers are also suitable for use as another type of filler particles. These include in particular the finely ground plastic powders obtained in the recycling of plastics, more particularly in the plastic powders obtainable from the fine grinding of highly crosslinked elastomeric or thermostable polymers. An example of such powders is the rubber powder obtained, for example, in the fine grinding of car wheels. Where the preparation according to the invention contains some filler particles of the other type individually or in the form of a mixture of two or more thereof, by weight ratio of gypsum particles of WDP to the filler particles of the other type is approximately 1: 1,000 to approximately 1,000: 1. Good results may be obtained, for example, if the weight ratio of gypsum particles of WDP to filler particles of the other type is about 1:10 to about 10: 1 and more particularly to 5: 1 to about 1: 5. In another preferred embodiment of the present invention, the filler component of the preparation contains at least about 0.5% by weight and, more particularly at least about 1%, of gypsum particles of WDP. In another preferred embodiment of the present invention, the percentage of gypsum particle content of WDP is at least about 10% by weight or at least about 20% by weight. Good results are also obtained with content contents of gypsum particles of WDP of at least about 30, 40 or 50% by weight or more, for example about 60 to 80% or at least about 90% by weight. In a preferred embodiment, the preparation according to the invention contains at least about 20% by weight of filler particles (gypsum particles of WDP or other filler particles or a mixture thereof). A larger percentage of filler particles can also be added, for example about 30, 40 or 50 to 99% by weight, for example about 60 to 90% by weight,. The compositions according to the invention may be present as an aqueous dispersion ready for use, that is, they may contain the water-soluble or water-dispersible polymer or the mixture of two or more such polymers and the fillers together with water. According to the invention, however, the compositions may equally well contain no water or only a little water, that is, for example they may be present as a dry powder or as a low water content paste. According to the invention, the preparation according to the invention can also be present as a water-free paste, a non-aqueous liquid, for example a solvent or another constituent of the preparation according to the invention, being used to establish the properties similar to pasta. The corresponding powders or pastes are of advantage, for example, when the current preparation of an aqueous dispersion intended for use is left to the user per se. In a preferred embodiment of the present invention, the preparation according to the invention is present in the powder form (redispersion powder). If WDP gypsum particles are used as a filler in accordance with the present invention, it is important to test the stability of the polymer dispersion used for the calcium ions. In such a case, the stability may have to be restored or improved by adding another emulsifier or dispersant or a mixture of two or more emulsifiers or dispersants. In addition to the polymer or polymers and the preparation filler particles according to the invention, it may contain other ingredients. If the preparation according to the invention is intended to be ready for use, it may contain water. Depending on the application contemplated for the preparation according to the invention, the water content may vary between about 0 and 49% by weight. Basically, the water contents (based on the preparation as a whole) of about 0 to 49% by weight are suitable. In addition to the mentioned constituents, the composition according to the invention may also contain one or more other additives. Other suitable additives are, for example, emulsifiers, dispersants, stabilizers, defoamers, antioxidants, photostabilizers, pigment dispersants and the like. The present invention also relates to a process for the production of a preparation containing a water soluble polymer or a water dispersible polymer or a mixture thereof and gypsum particles of WDP with an x50 particle size of 13 to 500 μm (as measured with a Sympatec Helos H0720 in isopropanol) or a mixture of gypsum particles of WDP and at least one other type of inorganic filler particles, characterized in that at least one water soluble polymer or at least one polymer dispersible in water or a mixture of two or more thereof or an aqueous dispersion containing one or more such polymers is mixed with gypsum particles of WDP having an x50 particle size of 13 to 500 μm (as measured with a Sympatec Helos H0720 in isopropanol) or a mixture of gypsum particles of WDP and at least one other type of inorganic log particles and optionally with water and one or more other additives in one or more mixing caps in any order and with any time interval between the individual mixing stages. The invention is illustrated by the accompanying drawings in which: Figure 1 is a gypsum electron micrograph of WDP with a rod-like granular particle shape. Figure 2 shows the size distribution of the filler particles of a WDP gypsum used as an example as filler. The present invention also relates to the use of gypsum particles of WDP having an x50 value of the particle size distribution of 13 to 500 μm (as measured with a Sympatec Helos H0720 in isopropanol) for the production of surface coatings , coating compounds, sealing compounds, adhesives or moldings with a content of water-soluble or water-dispersible polymers. In a preferred embodiment of the invention, the gypsum particles of WDP have an x50 value for the particle taimane distribution of 30 to 250 μm. The present invention also relates to the use of a mixture of inorganic filler particles containing gypsum particles of WDP with an x50 value for the particle size distribution of 30 to 250 μm and at least one of another type of filler particles inorganic as a filler in polymer dispersions. The invention is illustrated by the following examples EXAMPLES Example 1: Elasticity of emulsion-based adhesives The compositions according to the invention show favorable elongation behavior when used as an emulsion-based adhesive. Formulation: acrylate dispersion (eg Acronal® DS 3518, BASF) 55 g pigment dispersant (eg Pigmentverteiler A, BASF) 2 g Fillers: A: fine calcite filler (eg Omyacarb 5GU, D50 value 6 μm; Omya ) B: unwrought WDP gypsum (eg Rethmann, D50 40 μm value) C: ground natural gypsum (eg Alabaster Brilliantweiß, D50 value 11 μm; Bdrgardts) D: Coarse calcite filling (eg 50:50 mixture) of Omyacarb 130 AL / Omyacarb 40 GU, value D50 (mix) 88 μm, Omya) Example 2: Volume shrinkage of the coating compounds as a function of the filling composition. Visual Evaluation Formulation: Styrene / acrylate dispersion (eg DL 345 from Dow Latex) 1 10 g Pigment dispersant (eg Pigmentverteiler A, BASF) 4 g Filler: Filling used in 50 or 100% exchange of the same volume or same weight for filling. A (visual evaluation :-) A fine calcite filler (eg Omyacarb 5GU, D50 value 6 μm, Omya) B plaster of unmilled WDP (eg Rethmann, D50 value 40 μm) C ground natural gypsum (eg Alabaster Brilliantweiß, D50 value 11 μm, Borgardts) D: thick calcite filling (eg 50:50 mixture of Omyacarb 130 AL / Omyacarb 40 GU, value D50 (mixing) 88 μm; Omya) E: unwrought WDP gypsum (for example ProMineral No.1, D50 value 36 μm) F: unwrought WDP gypsum (eg ProMineral No.2, D50 value 96 μm) G: medium calcite filler coarse (eg Omyacarb 40 GU, value D50 44 μm, Omya) +: no visible volume shrinkage, no cracks ±: slight volume shrinkage / cracking -: different volume shrinkage / cracking Example 3: resistance to shear stress (wood-to-wood bonding) and viscosity behavior of emulsion-based adhesives Formulation: styrene / acrylate dispersion (eg DL 345 from Dow Latex) 110 g Pigment dispersant (eg Pigmentverteiler A, BASF) 4 g Fillers: A: Fine calcite filler (eg Omyacarb 5GU, D50 6 μm, Omya) B: Unmilled WDP gypsum (eg Rethmann, D50 40 μm) C: Natural ground gypsum (eg Alabaster Brilliantweiß, D50 value 11 μm, Borgardts) D: Coarse calcite filling (eg 50:50 blend of Omyacarb 130 AL / Omyacarb 40 GU, value D50 (mixing) 88 μm; Omya) Example 4: Resistance to shear stress (wood-to-wood bonding) and viscosity behavior of emulsion-based adhesives containing WDP gypsum with different particle size distributions Formulation: Styrene / acrylate dispersion (eg DL 345 from Dow Latex) 110 g Pigment dispersant (by example Pigmentverteiler A, BASF) 4 g Fillers: A: fine calcite filler (for example Omyacarb 5GU, D50 6 μm, Omya) E: WDP plaster without milling (eg ProMineral No. 1, D50 value 36 μm) F: WDP plaster unmolded (eg ProMineral No. 2, D50 value 96μm) G: medium thick calcite filler (for example Omyacarb 40 GU, value D50 44 μm, Omya)

Claims (11)

1. A preparation containing a water soluble polymer or a water dispersible polymer or a mixture of two or more thereof and filler particles, the filler particles being gypsum particles from waste gas desulfurization plants (gypsum particles). of WDP) with a value for particle size distribution x50 of 13 to 500 μm (as measured with a Sympatec Helos H0720 in isopropanol).

2. The preparation as claimed in claim 1, characterized in that the value for the distribution of x50 particle teima from the gypsum particles of WDP is 30 μm to 250 μm.

3. The preparation as claimed in claim 1 or 2, characterized in that it contains gypsum particles of WDP in admixture with at least one other type of filler particles.

The preparation as claimed in claim 4, characterized in that the inorganic filler particles selected from the group consisting of chalk (CaCO3), titanium dioxide, barium sulfate, silica flour, silica gel, dolomite or kaolin or a mixture of two or more thereof are present as the other type of filler particles.

5. The preparation as claimed in any of claims 1 to 4, characterized in that a polymer selected from the group consisting of polyurethanes, polyacrylates, polymethacrylates, polyvinyl esters, 5 polystyrenes, polybutadienes, polyamides, polyesters, polyvinyl chlorides, ethylene / vinyl acetate copolymers (EVA), styrene / butadiene copolymers (SBR), styrene / acrylonitrile (SAN) polymers, styrene / acrylate copolymers or a mixture of two or more thereof ^ 10 is present as the water-soluble or water-dispersible polymer.

6. The preparation as claimed in any of claims 1 to 5, characterized in that it contains at least 40% by weight filler particles.

The preparation as claimed in any of claims 1 to 6, characterized in that it contains 50 to 99% by weight of gypsum particles of WDP or a mixture that flB contains gypsum particles of WDP and at least one of another type of inorganic filler particles, 1 to 50% by weight of 20 polymer, 0 to 49% by weight of water and 0 to 49% by weight of other additives.

8. A process for the production of a preparation containing a water soluble polymer or a water dispersible polymer or a mixture thereof and particles 25 of WDP gypsum with an x50 particle size of 13 to 500 μm (as measured with a Sympatec Helos H0720 in isopropanol) or a mixture of gypsum particles of WDP and at least one other type of inorganic filler particles, characterized in that at least one water soluble polymer or at least one water dispersible polymer or a mixture of two or more thereof or an aqueous dispersion containing one or more such polymers is mixed with gypsum particles of WDP having a particle size x50 from 13 to 500 μm (as measured with a Sympatec Helos H0720 in isopropanol) or a mixture of WDP particles from that and at least one other type of inorganic filler particles and optionally with water and one or more of other additives in one or more mixing steps in any order and with any time interval between the individual mixing steps.

9. The use of WDP gypsum particles having an x50 value of the particle size distribution of 13 to 500 μim (as measured with a Sympatec Helos H0720 in isopropanol) for the production of surface coatings, coating compounds , sealing compounds, adhesives or castings with a content of water-soluble or water-dispersible polymers.

10. The use as claimed in claim 9, characterized in that the gypsum particles of WDP have an x50 value for the particle size distribution of 30 to 250 μm.

11. The use of a mixture of inorganic filler particles containing gypsum particles of WDP with an x50 value for the particle size distribution of 30 to 250 μm and at least one other type of inorganic filler particles as a filler in polymer dispersions.