DE102010034874A1 - Mineral binder composition, useful in chemical building e.g. tile adhesive, comprises a pozzolanic or latent hydraulic binding material, a calcium sulfoaluminate, and a calcium sulfate hemihydrate and/or calcium sulfate anhydrite - Google Patents

Abstract

Mineral binder composition comprises (a) at least a pozzolanic or latent hydraulic binding material, (b) at least a calcium sulfoaluminate, and (c) at least a calcium sulfate hemihydrate and/or calcium sulfate anhydrite, where the weight ratio of: (a) to (b) is 5:1-1:10 and (b) to (c) is 1:2. An independent claim is included for chemical building product comprising the mineral binder composition.

Description

The invention relates to mineral binder compositions containing at least one pozzolanic or latent-hydraulic setting material, at least one calcium sulfoaluminate and at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite, wherein the weight ratio of the individual constituents to each other is set in certain ranges, as well as construction chemical products, which contain a corresponding binder composition.

Typical construction chemical products, such as, for example, tile adhesives, joint fillers, fillers, sealing slurries or mortar compounds, are based on a binder or binder mixture to which various additives and auxiliaries or additives are added. The binders used are predominantly cements, in particular Portland cement or calcium aluminate cement, or else calcium sulphates. As a supplement, for example, various fillers, especially sand and limestone powder used.

Products based on Portland cement are generally characterized by comparatively long setting times. Thus, after mixing the product with water, the product will retain a viscous, spreadable consistency for an extended period of time and can be easily processed during this time. After setting, the products are characterized by high resistance to mechanical stress and to the action of water. In the construction sector, especially for outdoor use, such products are therefore widely used. A disadvantage of known mortar products based on Portland cement, however, is that these products, after mixing with water, d. H. as a so-called fresh mortar, have a very high pH. Due to the high alkalinity, the products are irritating and cause great irritation on contact with the skin. Already the contact of the dry mortar with the natural moisture of the skin can lead to corresponding skin irritations. In order to noticeably lower the pH in such products, the content of Portland cement in the product must be drastically reduced. As a result, however, the properties of the cured mortar drastically deteriorate, in particular its strength and thus resistance to environmental influences.

Alternatively, chemical products based on gypsum can be formulated. Different gypsum mortars are commercially available today and are used in the construction industry, for example as putty. Such gypsum mortars have a much lower pH after mixing with water, as the said products based on Portland cement. Irritation and skin irritation can thus be avoided. However, these products have significant disadvantages in terms of application properties. This is how gypsum-based products break down comparatively quickly. In order to ensure a sufficiently long period in which the product can be processed, the addition of special auxiliaries, such as retarders or plasticizers is necessary. In addition, hardened gypsum mortars are not water resistant and therefore completely unsuitable for outdoor use. Also, the mechanical strength remains well behind the mechanical strength of products based on Portland cement.

WO 01/74737 A1 is concerned with the development of binder compositions that combine the benefits of cement-based and gypsum-based binders. It is in particular on setting and curing time and the resistance of the cured products against various environmental influences, especially against water lifted. With the problem of adjusting a certain pH deals WO 01/74737 A1 not. As the binder composition, there is proposed a mixture comprising a first hydraulic binder and a second sulfate-based binder. The first hydraulic binder contains as its main component a compound of the mineral composition 3CaO.3Al ₂ O ₃ .CaSO ₄ . This mineral phase is often referred to as Yeelimite. Suitable examples are calcium sulfoaluminate cements. The sulfate-based binder is calcium sulfate hemihydrate and / or calcium sulfate anhydrite, in particular those compounds which are distinguished by special crystal structures are used. The weight ratio of the two components can vary within wide limits, wherein each of the components can be present in significant excess. The mixture can be formulated free of Portland cement and contain conventional additives such as limestone flour. Information on which amounts or proportions of these additives are added, can not be found. It is also not apparent that the compositions are characterized by a comparatively low pH.

It is therefore an object of the present invention to provide mineral binder compositions (also referred to below as binder system) in particular for construction chemical products which permit the production of construction-chemical products, in particular mortar products, which are distinguished by a comparatively low pH and yet excellent Characterize the processing properties and resistance of the cured products to various environmental influences, in particular mechanical stress and the influence of water.

It has now surprisingly been found that the object is achieved by mineral binder compositions containing at least one pozzolanic or latent-hydraulic setting material, at least one calcium sulfoaluminate and at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite in certain weight ratios.

• A) mindestens ein puzzolanisch oder latent-hydraulisch abbindendes Material,
• B) mindestens ein Calciumsulfoaluminat und
• C) mindestens ein Calciumsulfat-Hemihydrat und/oder Calciumsulfat-Anhydrit

enthalten, wobei das Gewichtsverhältnis von Komponente A) zu Komponente B) von 5:1 bis 1:10 und das Gewichtsverhältnis von Komponente B) zu Komponente C) von 50:1 bis 1:2 beträgt.The present invention thus relates to mineral binder compositions which

• A) at least one pozzolanic or latent-hydraulic setting material,
• B) at least one calcium sulfoaluminate and
• C) at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite

wherein the weight ratio of component A) to component B) of 5: 1 to 1:10 and the weight ratio of component B) to component C) of 50: 1 to 1: 2.

To calculate the weight ratios, the total amount of all constituents of a corresponding component must be assumed. Accordingly, with respect to component A), the total amount of all pozzolanically or latently-hydraulically setting materials present, with respect to component B), of the total amount of all calcium sulfoaluminates present and, with regard to component C), the total amount of all calcium sulfate hemihydrates and calcium sulfate anhydrites present.

According to the invention, pozzolans are components which react and hydraulically set in the presence of Ca (OH) ₂ . These include naturally occurring pozzolans such as metakaolin, trass or phonolite, as well as artificially produced pozzolans such as silica dusts, for example microsilica, or flyashes or reactive silicas. Natural pozzolans are typically ground to particle sizes less than 200 microns prior to use to increase reactivity.

As latent-hydraulic binder binders are called, which set hydraulically in the presence of an exciter. The lime content of latent-hydraulic binders is significantly higher than that of pozzolanic binders. Latent hydraulic binders are, for example, slag sands or blastfurnace slag.

The mineral binder compositions of the invention are characterized in particular by a comparatively low pH. Thus, for example, tile adhesives, joint fillers, fillers, sealing slurries or mortar compositions can be obtained by admixing filler, in particular sand and limestone powder, and optionally auxiliaries and additives, which, after addition of water in a weight ratio of 10: 1, have a pH (23 ° C .; Atmospheric pressure) of not more than 11.0. The mineral binder compositions hydraulically bind and cure to durable products which are particularly water insoluble. Construction-based products based on the binder system according to the invention can therefore also be used without problems in outdoor areas. The addition of further mineral binders, in particular Portland cement can be dispensed with. The requirements according to the standards for leveling compounds, sealing slurries, mortars and adhesives for tiles can be reliably fulfilled when using the binder system according to the invention.

According to the invention, it is crucial that the mineral binder compositions contain the constituents in the stated weight ratios. This ensures that crop-based products based on the corresponding binder system have the desired low pH and, moreover, have excellent processing and application properties, in particular, they are water-resistant after curing.

Preferably, the mineral binder composition according to the invention contains component A), d. H. the pozzolanic or latent-hydraulic setting material, and component B), d. H. Calcium sulfoaluminate, in a weight ratio of 4: 1 to 1: 8, more preferably from 3: 1 to 1: 5.

The weight ratio of component B), d. H. Calcium sulfoaluminate, to component C), d. H. Calcium sulfate hemihydrate and / or calcium sulfate anhydrite is preferably from 30: 1 to 1: 2, more preferably from 30: 1 to 1: 1, more preferably from 20: 1 to 1: 1, and most preferably from 15: 1 to 1.5: 1.

The weight ratio of component A) to component C) varies within the range specified by the definition of the weight ratios of component A) to component B) on the one hand and of component B) to component C) on the other hand.

Preferably, the mineral binder compositions comprise component A), d. H. at least one pozzolanic or latent-hydraulic setting material, in an amount of 5 to 80 wt .-%, more preferably 15 to 70 wt .-%, particularly preferably 20 to 65 wt .-%, each based on the total weight of the mineral binder composition and calculated as the sum of all pozzolanic or latent-hydraulic setting materials included in the composition.

Component B), d. H. at least one calcium sulfoaluminate, the mineral binder compositions preferably contain in an amount of 15 to 80 wt .-%, more preferably 30 to 60 wt .-%, particularly preferably 45 to 55 wt .-% and most preferably 45 to 50 wt. %, in each case based on the total weight of the mineral binder composition and calculated as the sum of all calcium sulfoaluminates contained in the composition.

Finally, the mineral binder compositions contain component C), d. H. at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite, preferably in an amount of 1 to 40 wt .-%, more preferably 2 to 30 wt .-%, particularly preferably 3 to 20 wt .-% and most preferably 4 bis 10 wt .-%, each based on the total weight of the mineral binder composition and calculated as the sum of all contained in the composition calcium sulfate hemihydrates and / or calcium sulfate anhydrites.

In this case, mineral binder compositions are particularly preferred which contain at least two, preferably all three components A), B) and C) in an amount as defined as preferred, particularly preferred and very particularly preferred, wherein any combinations of the specified ranges possible are.

• A) 5 bis 80 Gew.-% mindestens eines puzzolanisch oder latent-hydraulisch abbindenden Materials,
• B) 15 bis 80 Gew.-% mindestens eines Calciumsulfoaluminats und
• C) 1 bis 40 Gew.-% mindestens eines Calciumsulfat-Hemihydrats und/oder Calciumsulfat-Anhydrits,

jeweils bezogen auf das Gesamtgewicht der mineralischen Bindemittelzusammensetzung, enthalten.For example, binder compositions which are preferred

• A) from 5 to 80% by weight of at least one pozzolanic or latent-hydraulic setting material,
• B) 15 to 80 wt .-% of at least one calcium sulfoaluminate and
• C) 1 to 40% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite,

each based on the total weight of the mineral binder composition.

The mineral binder composition may contain other ingredients in addition to the three components mentioned. These may initially be impurities and minor constituents of the components A), B) and C) used to prepare the binder compositions.

Thus, the calcium sulfoaluminate contained as component B) is preferably introduced into the mineral binder compositions in the form of one or more commercially available calcium sulfoaluminate cements. These calcium sulfoaluminate cements contain as the main component calcium sulfoaluminate. This is present in the calcium sulfoaluminate cement usually in an amount of 55 to 75 wt .-% in the form of a mineral phase of the general composition 3CaO · 3Al ₂ O ₃ · CaSO ₄ before. This mineral phase is referred to in the short notation with C ₄ A ₃ Ŝ or as Yeelimite. As further constituents, the calcium sulfoaluminate cements generally contain 15 to 30% by weight of dicalcium orthosilicate (C ₂ S), 3 to 6% by weight of calcium aluminum ferrite of the 4CaO.Al ₂ O. 3Fe ₂ O ₃ (C ₄ AF) type and 10 to 20 wt .-% calcium sulfate anhydrite. These constituents are naturally incorporated into the mineral binder composition, provided that component B) is introduced into the mineral binder compositions in the form of one or more commercially available calcium sulfoaluminate cements.

In particular, auxiliaries and additives which influence the application properties of the mineral binder composition, in particular the ready-to-use water-mixed preparation, such as, for example, its viscosity or setting behavior, are also suitable as further ingredients. By way of example, mention may be made of thixotropic agents, accelerators and retarders.

However, it is also not excluded that the mineral binder composition contains further binders as further ingredients. However, this is not preferred.

If the mineral binder composition does not consist exclusively of the components A), B) and C), it is preferred that the total amount of the components A), B) and C) in the mineral binder composition at least 50 wt .-%, based on the mineral binder composition. The total amount of components A), B) and C) is preferably at least 60% by weight, particularly preferably at least 80% by weight, very particularly preferably at least 95% by weight, in each case based on the mineral binder composition. It is preferred that the mineral binder composition in addition to the components A), B) and C) contains only those other ingredients that are registered as impurities and Nebenbestanteile of the components used for the preparation of the mineral binder compositions components A), B) and C). Preferably, the mineral binder compositions are free of Portland cement.

In the pozzolanic or latent-hydraulic setting material, i. H. Component A) is preferably a blastfurnace slag, a fly ash or a silica fume, in particular microsilica, more preferably granulated blastfurnace and / or hard coal fly ash.

As component B) it is possible to use customary commercially available calcium sulfoaluminates and mixtures thereof. As already mentioned, the calcium sulfoaluminate present as component B) is preferably introduced into the mineral binder compositions in the form of one or more commercially available calcium sulfoaluminate cements. Accordingly, the calcium sulfoaluminate is preferably present in the form of a mineral phase of the general composition 3CaO.3Al ₂ O.3CaSO ₄ (C ₄ A ₃ Ŝ / Yeelimite).

As calcium sulfate hemihydrates and / or calcium sulfate anhydrites, which are used as component C), it is possible to use customary commercially available calcium sulfate hemihydrates and / or calcium sulfate anhydrites and mixtures thereof.

On the basis of the mineral binder compositions, construction chemical products, in particular tile adhesives, joint fillers, fillers, sealing slips and mortar compounds, can be produced, which are distinguished by excellent processing and application properties and also a comparatively low pH value and thus in comparison to conventional construction chemical products Base of Portland cement decreased irritant effect.

Another object of the invention are therefore construction chemical products containing a mineral binder composition according to the invention. With regard to the preferred and particularly preferred embodiments of the mineral binder compositions contained, the statements made in the description of the mineral binder compositions according to the invention apply correspondingly.

In addition to the binder system, the construction-chemical products preferably also contain at least one filler. Fillers which can be used are all customary fillers, in particular those based on minerals. Preferably, the filler is selected from limestone powder and quartz sand.

Mineral binder composition and filler are usually the main constituents of construction chemical products. Preferably, the proportion of mineral binder composition and filler in total at least 70 wt .-%, more preferably at least 80 wt .-%, each based on the total weight of the construction chemical product. In addition, the construction chemical products may contain the usual auxiliaries and additives for such products, in particular thixotropic and / or water retention agents, such as cellulose ethers or methylcellulose ethers, and disperse powder, exciters, retarders, air entrainers, defoamers and condenser are used.

Preferably, the construction chemical products contain component A), d. H. pozzolanic or latent-hydraulic setting material, in an amount of 2 to 26.5% by weight, more preferably in an amount of 5 to 22% by weight, most preferably in an amount of 7.5 to 20% by weight. -%, in each case based on the total weight of the construction chemical product.

Component B), d. H. Calcium sulfoaluminate, is preferably in an amount of 2 to 26.5 wt .-%, more preferably in an amount of 7.5 to 26.5 wt .-% and most preferably in an amount of 10 to 20 wt .-% , in each case based on the total weight of the construction chemical product.

Component C), ie calcium sulfate hemihydrate and / or calcium sulfate anhydrite, is particularly preferred in an amount of 1 to 10 wt%, more preferably in an amount of 1 to 6 wt% preferably in an amount of 1.5 to 5.5 wt .-%, each based on the total weight of the crop-mixed product.

Of course, the amounts of components A), B) and C) are to be selected so that the weight ratios of these constituents listed in the description of the mineral binder composition are maintained.

In addition to the mineral binder system, the construction-chemical products preferably also contain at least one filler. In this case, the filler or the fillers are preferably in a total amount of 1 to 85 wt .-%, based on the total weight of the construction chemical product contained. More preferably, the total amount of filler is from 5 to 80% by weight, more preferably from 30 to 70% by weight, and most preferably from 50 to 65% by weight.

As already mentioned, the filler is preferably selected from limestone meal and quartz sand. In this case, the construction chemicals preferably contain the limestone powder in an amount of up to 15% by weight, more preferably in an amount of up to 13% by weight, most preferably in an amount of up to 11% by weight. , and the quartz sand in an amount of up to 65 wt .-%, particularly preferably in an amount of up to 55 wt .-%, each based on the total weight of the construction chemical product. The construction chemical product may contain limestone powder and quartz sand each alone. Preferably, however, it contains a mixture of limestone flour and quartz sand. The total amount of limestone meal and quartz sand is preferably at least 1% by weight, based on the total weight of the construction chemical product. Particular preference is given to containing limestone powder and quartz sand in a total amount of from 1 to 85% by weight, based on the total weight of the construction-chemical product. More preferably, the total amount of limestone powder and quartz sand 5 to 80 wt .-%, most preferably 30 to 70 wt .-% and particularly preferably 50 to 65 wt .-%, each based on the total weight of the construction chemical product.

Preferably, the construction chemical products may further contain at least one thixotropic and / or water retention agent. Corresponding agents are preferably used in a total amount of 0.05 to 1 wt .-%, particularly preferably 0.1 to 0.9 wt .-%, each based on the total weight of the construction chemical product.

Finally, the construction chemical products according to the invention may contain all further auxiliaries and additives customary for corresponding products, as well as the impurities and secondary constituents mentioned in the description of the mineral binder composition. These are preferably contained in a total amount of 0 to 15 wt .-%, particularly preferably in an amount of 0 to 10 wt .-%, each based on the total weight of the construction chemical product.

Particular preference is given to construction-chemical products which contain the abovementioned components in each case in an amount as defined as being preferred, particularly preferred and very particularly preferred, any combinations of the ranges specified in detail being possible. Depending on the desired application, the construction chemical products according to the invention may differ with respect to the preferred composition.

Further possible auxiliaries and additives may be, for example, dispersion powders (eg based on ethylene / vinyl acetate copolymers), hardening accelerators (for example calcium salts and / or formates, in particular calcium formate), sulfate carriers, preservatives, pigments, flow agents, dispersants , Condenser or defoamer may be included.

If the construction chemical products are to be distinguished by a particularly low specific weight, the addition of lightweight aggregates is recommended. These lightweight aggregates typically have densities of less than 2000 kg / m ³ , preferably less than 1500 kg / m ³ , most preferably less than 1200 kg / m ³ or even less than 1000 kg / m ³ . Suitable for this purpose are, for. B. hollow microspheres made of glass, ceramic or plastic, expanded glass, expanded mica, Blähperlite, Blähschiefer or expanded clay. It can also be combined with each other two or more of these different lightweight aggregates.

If present, the amount of lightweight aggregates in the construction-chemical products according to the invention is usually up to 50% by weight, in particular 3 to 40% by weight, particularly preferably 5 to 30% by weight, very particularly preferably between 10 and 20% by weight. %, in each case based on the total weight of the construction chemical product. Preferred maximum amounts are 20 wt .-%, preferably 40 wt .-% and most preferably 50 wt .-%.

Depending on the specific ingredients, the construction chemical products may tend to form considerable dust in the dry state. In particular, when decanting or when mixing with water, it may cause excessive dust. The fine dust settles on the user's clothing and skin and in the worst case is absorbed via the respiratory tract. It is therefore desirable to counteract this dust development.

Preferably, the construction-chemical products according to the invention therefore further contain at least one additive for reducing dusting (also referred to as "dust-reducing agent", "dust-reducing additive" or "dedusting additive"). Dust-removing additives based on hydrocarbons or hydrocarbon mixtures or polyethylene glycols are preferably used. These effect a long-term dedusting with respect to the hereby treated construction chemical products, which is retained both in closed storage and in open storage, especially under atmospheric oxygen.

Advantageously, under normal conditions (i.e., 25 ° C and atmospheric pressure) liquid hydrocarbons or hydrocarbon mixtures or polyethylene glycols are used as dedusting additives. On the one hand, this has the advantage that liquid application forms can be better applied to the dedusting construction chemical products and the order is more homogeneous than in the case of solid dedusting additives and also manages with smaller amounts than in the case of solid dedusting additives. Also, the adhesion of liquid additives or additive mixtures is improved compared to solid forms with respect to the construction chemical products to be treated. Therefore, under normal conditions, liquid hydrocarbons or hydrocarbon mixtures or polyethylene glycols are preferably used as dedusting additives.

Particularly suitable aliphatic hydrocarbons or hydrocarbon mixtures, in particular linear or branched, preferably linear, saturated or unsaturated hydrocarbons or hydrocarbon mixtures, preferably saturated aliphatic hydrocarbons or hydrocarbon mixtures, are used as dedusting additives based on hydrocarbons or hydrocarbon mixtures which can be used according to the invention. However, the aliphatic hydrocarbons or hydrocarbon mixtures preferably used may contain certain aromatic constituents, in particular aromatic hydrocarbons; This is especially the case when technical hydrocarbons or hydrocarbon mixtures are used, for. As technical mineral oils often contain aromatic components. In such a case, the aromatics content, based on the total hydrocarbons or total hydrocarbon mixtures used, should advantageously not exceed 30% by weight, preferably 20% by weight, preferably 17.5% by weight, particularly preferably 15% by weight.

The hydrocarbons or hydrocarbon mixtures used as dedusting additives, in particular aliphatic hydrocarbons or hydrocarbon mixtures (optionally with aromatic fractions, as defined above), preferably have boiling points or boiling ranges in the order of 100 to 400 ° C, especially 150 to 350 ° C, preferably 200 to 300 ° C, on, in each case based on atmospheric pressure. Such hydrocarbons or hydrocarbon mixtures, in particular aliphatic hydrocarbons or hydrocarbon mixtures (optionally with aromatic fractions, as defined above), can be processed well as dedusting additives with the construction chemicals and have only extremely low volatility, so that a long-term dedusting effect is achieved and not appreciable amounts be volatilized in dedusting additive over a certain storage time. The abovementioned boiling points or boiling ranges relate in particular to the hydrocarbons or hydrocarbon mixtures which are liquid under standard conditions (25 ° C. and atmospheric pressure) in the total mixture used as dedusting additive.

The hydrocarbons or hydrocarbon mixtures used in the products according to the invention are preferably hydrocarbons having a carbon number between 10 and 40, preferably between 15 and 30.

Preferably used hydrocarbons or hydrocarbon mixtures have densities in the range of 800 to 900 kg / m ³ , in particular 825 to 875 kg / m ³ , on.

In addition, it is preferred if the hydrocarbons or hydrocarbon mixtures used as dedusting additives at a temperature of 107 ° C for a evaporation loss over 24 hours of less than 5 wt .-%, preferably less than 2 wt .-%, particularly preferably less than 1 % By weight, based on the hydrocarbons or hydrocarbon mixtures. In this way, it is ensured that on the one hand a long-term dedusting is achieved with respect to the construction chemical products and on the other hand, the products are at least substantially odorless or low odor, since hydrocarbons or hydrocarbon mixtures are released at best in the smallest amounts.

The dedusting additives based on hydrocarbons or hydrocarbon mixtures may generally be used in amounts of from 0.01 to 10% by weight, in particular from 0.01 to 5% by weight, preferably from 0.1 to 5% by weight, more preferably 0 , 25 to 3 wt .-%, each based on the total weight of the construction chemical product used. The above lower limits are in particular due to the fact that a significant dedusting effect is to be achieved, while the upper limits on the one hand due to the processing or application properties and on the other hand due to economic considerations, also with a view to technical feasibility. Nevertheless, depending on the application or the individual case, it may be necessary or desirable to deviate from the aforementioned values, which is at the discretion of the person skilled in the art.

The construction chemicals can continue to contain fibers as auxiliaries and additives. On the one hand, these can also have a positive effect on the dust behavior; on the other hand, the application properties of the construction chemical product, in particular its mechanical stability after curing, can be influenced by targeted addition of fibers.

In principle, any fibers can be used, with mineral fibers and natural and synthetic synthetic fibers being considered equally. Preferably, however, polyolefin fibers, such as. As polyethylene or polypropylene fibers, or cellulose fibers used.

The building chemical products may contain the fibers in particular in amounts of up to 2 wt .-%, preferably in amounts of up to 1 wt .-%, particularly preferably in the range of 0.1 to 1 wt .-%, based on the construction mix Products.

Preferably used fibers have fiber lengths in the range of 50 to 5,000 .mu.m, in particular 50 to 500 .mu.m.

The construction-chemical products according to the invention preferably have a pH of 9.5 to 11. To determine the pH, the construction chemical product is mixed with water in a weight ratio of 10: 1 (chemical product: water), the resulting mixture is stirred thoroughly and the resulting suspension is measured at 23 ° C. and atmospheric pressure.

The construction-based products are preferably tile adhesives, joint fillers, fillers, sealing slurries or mortar compounds, particularly preferably tile adhesives, joint fillers or leveling compounds.

• A) 7,5 bis 26,5 Gew.-% mindestens eines puzzolanisch oder latent-hydraulisch abbindenden Materials,
• B) 7,5 bis 26,5 Gew.-% mindestens eines Calciumsulfoaluminats,
• C) 1 bis 10 Gew.-% mindestens eines Calciumsulfat-Hemihydrats und/oder Calciumsulfat-Anhydrits,
• D) 0,05 bis 0,6 Gew.-% mindestens eines Thixotropierungs- und/oder Wasserretentionsmittels,
• E) 0 bis 13 Gew.-% Kalksteinmehl,
• F) 0 bis 65 Gew.-% Quarzsand,
• G) 0 bis 40 Gew.-% mindestens eines Leichtfüllstoffs,
• H) 0 bis 3 Gew.-% mindestens eines Entstaubungsadditivs und
• I) 0 bis 15 Gew.-% weitere Hilfs- und Zusatzstoffe.

In a particular embodiment of the invention, the construction chemical product is a tile adhesive which has the following constituents, the following quantities being based in each case on the total weight of the construction-chemical product and adding up in each case to 100% by weight:

• A) from 7.5 to 26.5% by weight of at least one pozzolanic or latently-hydraulically setting material,
• B) 7.5 to 26.5% by weight of at least one calcium sulfoaluminate,
• C) 1 to 10% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite,
• D) 0.05 to 0.6% by weight of at least one thixotropic and / or water retention agent,
• E) 0 to 13% by weight limestone flour,
• F) 0 to 65% by weight of quartz sand,
• G) 0 to 40% by weight of at least one light filler,
• H) 0 to 3 wt .-% of at least one dedusting additive and
• I) 0 to 15 wt .-% further auxiliaries and additives.

• A) 2 bis 25 Gew.-% mindestens eines puzzolanisch oder latent-hydraulisch abbindenden Materials,
• B) 2 bis 25 Gew.-% mindestens eines Calciumsulfoaluminats,
• C) 1 bis 10 Gew.-% mindestens eines Calciumsulfat-Hemihydrats und/oder Calciumsulfat-Anhydrits,
• D) 0,05 bis 0,6 Gew.-% mindestens eines Thixotropierungs- und/oder Wasserretentionsmittels,
• E) 0 bis 80 Gew.-% Kalksteinmehl, Marmormehl und/oder Dolomitmehl,
• F) 0 bis 65 Gew.-% Quarzsand,
• G) 0 bis 3 Gew.-% mindestens eines Entstaubungsadditivs und
• H) 0 bis 15 Gew.-% weitere Hilfs- und Zusatzstoffe.

In a further embodiment of the invention, the construction chemical product is a joint filler which has the following constituents, the following quantities being based in each case on the total weight of the construction chemical product and each adding up to 100% by weight:

• A) 2 to 25% by weight of at least one pozzolanic or latently-hydraulically setting material,
• B) 2 to 25% by weight of at least one calcium sulfoaluminate,
• C) 1 to 10% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite,
• D) 0.05 to 0.6% by weight of at least one thixotropic and / or water retention agent,
• E) 0 to 80% by weight limestone flour, marble flour and / or dolomite flour,
• F) 0 to 65% by weight of quartz sand,
• G) 0 to 3 wt .-% of at least one dedusting additive and
• H) 0 to 15 wt .-% further auxiliaries and additives.

• A) 7,5 bis 26,5 Gew.-% mindestens eines puzzolanisch oder latent-hydraulisch abbindenden Materials,
• B) 7,5 bis 26,5 Gew.-% mindestens eines Calciumsulfoaluminats,
• C) 1 bis 10 Gew.-% mindestens eines Calciumsulfat-Hemihydrats und/oder Calciumsulfat-Anhydrits,
• D) 0,05 bis 0,6 Gew.-% mindestens eines Thixotropierungs- und/oder Wasserretentionsmittels,
• E) 0 bis 13 Gew.-% Kalksteinmehl,
• F) 0 bis 65 Gew.-% Quarzsand,
• G) 0,1 bis 4 Gew.-% mindestens eines Verflüssigers, Superverflüssigers und/oder Fließmittels,
• H) 0 bis 3 Gew.-% mindestens eines Entstaubungsadditivs und
• I) 0 bis 15 Gew.-% weitere Hilfs- und Zusatzstoffe.

In a further embodiment of the invention, the crop-mixed product is a self-leveling putty compound which has the following constituents, the following quantities being based in each case on the total weight of the crop-based product and adding up in each case to 100% by weight:

• A) from 7.5 to 26.5% by weight of at least one pozzolanic or latently-hydraulically setting material,
• B) 7.5 to 26.5% by weight of at least one calcium sulfoaluminate,
• C) 1 to 10% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite,
• D) 0.05 to 0.6% by weight of at least one thixotropic and / or water retention agent,
• E) 0 to 13% by weight limestone flour,
• F) 0 to 65% by weight of quartz sand,
• G) 0.1 to 4% by weight of at least one liquefier, superplasticizer and / or flow agent,
• H) 0 to 3 wt .-% of at least one dedusting additive and
• I) 0 to 15 wt .-% further auxiliaries and additives.

• A) 7,5 bis 26,5 Gew.-% mindestens eines puzzolanisch oder latent-hydraulisch abbindenden Materials,
• B) 7,5 bis 26,5 Gew.-% mindestens eines Calciumsulfoaluminats,
• C) 1 bis 10 Gew.-% mindestens eines Calciumsulfat-Hemihydrats und/oder Calciumsulfat-Anhydrits,
• D) 0,05 bis 0,6 Gew.-% mindestens eines Thixotropierungs- und/oder Wasserretentionsmittels,
• E) 0,03 bis 0,7 Gew.-% Quarzsand,
• F) 0 bis 40 Gew.-% mindestens eines Dispersionspulvers,
• G) 0,5 bis 5 Gew.-% mindestens eines Entstaubungsadditivs und
• H) 0 bis 15 Gew.-% weitere Hilfs- und Zusatzstoffe.

In a further embodiment of the invention, the construction chemical product is a cementitious sealing slurry which has the following constituents, the following quantities being based in each case on the total weight of the construction chemical product and each adding up to 100% by weight:

• A) from 7.5 to 26.5% by weight of at least one pozzolanic or latently-hydraulically setting material,
• B) 7.5 to 26.5% by weight of at least one calcium sulfoaluminate,
• C) 1 to 10% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite,
• D) 0.05 to 0.6% by weight of at least one thixotropic and / or water retention agent,
• E) 0.03 to 0.7% by weight of silica sand,
• F) 0 to 40 wt .-% of at least one dispersion powder,
• G) 0.5 to 5 wt .-% of at least one dedusting additive and
• H) 0 to 15 wt .-% further auxiliaries and additives.

Preferred amounts of the individual components correspond in all four cases to those already mentioned above in the basic description of the construction-chemical products according to the invention.

The application of construction chemicals is done in the usual way. To prepare a ready-to-use mixture, the dry product is usually mixed with water or an aqueous dispersion and mixed, the proportion being chosen so that a spreadable suspension is formed. The viscosity can be adjusted by changing the quantitative ratio to the specific application. The ready-mixed mixture is applied by means of suitable equipment, such as a spatula or trowel, on the component to be treated and allowed to harden.

In the following the invention will be explained in more detail by means of examples, the examples serving merely to illustrate the invention and not represent a limitation of the inventive concept.

Examples:

The quantities given below are by weight unless otherwise stated.

Examples 1 to 4:

By simply mixing the raw materials listed in Table 1, the construction chemicals B1 to B4 were prepared. The product B1 represents a comparison recipe based on a Portland cement. The products B2 to B4 are according to the invention and each contain a mineral binder composition according to the invention, the fillers limestone powder and quartz sand, and in a minor amount the other auxiliaries and additives cellulose ethers and calcium formate listed in the table. The construction chemical products B1 to B4 are each in the form of a dry mixture, ie in powder form. Table 1: raw materials B1 (comparison) B2 B3 B4 Portland cement 33.0 0 0 0 Granulated blast furnace slag 0 15.7 18.5 0 Coal fly ash 0 0 0 18.5 Calcium sulfoaluminate cement (52% Yeelimite) 0 15.7 18.5 18.5 Calcium sulfate hemihydrate 0 1.6 1.6 1.6 cellulose ethers 0.4 0.4 0.4 0.4 limestone 11 11 5.4 5.4 quartz sand 55.6 54.9 54.9 54.9 calcium 0 0.7 0.7 0.7 total quantity 100 100 100 100

To investigate the properties of the construction chemical products according to Example 1 to 4, 100 g of each product were mixed with 10 g of water. After mixing, the pH of the resulting suspension at 23 ° C and atmospheric pressure was measured in each case, and the adhesive tensile strengths according to DIN EN 12004 combined with EN 1348: 2007, 8.2 after each 1, 7 and 28 days of dry storage under standard conditions (23 ° C, 50% relative humidity) and after 7 days of dry storage under standard conditions and subsequent storage for 21 days. The results are shown in Table 2. Table 2: B1 (comparison) B2 B3 B4 Adhesive tensile strengths [N / mm ² ] After 1 day storage under standard conditions 0.59 0.63 1.09 0.72 After 7 days of storage under standard conditions 1.21 1.39 1.34 1.38 After 28 days storage under standard conditions 1.49 1.41 1.44 1.49 After 7 days storage under standard conditions and 21 days storage in water 0.58 0.50 0.56 0.59 PH value 12.9 10.35 10.4 10.25

As can be seen from Table 2, the pH of the crop-mixing products B2 to B4 according to the invention is in the desired range of not more than 11.0. In addition, good bond tensile strengths are achieved comparatively quickly. By contrast, the pH of the comparative product B1 is markedly higher at 12.9.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 01/74737 A1 [0005, 0005]

Cited non-patent literature

• DIN EN 12004 [0070]
• EN 1348: 2007, 8.2 [0070]

Claims (11)

A mineral binder composition comprising A) at least one pozzolanic or latently-hydraulically setting material, B) at least one calcium sulfoaluminate and C) at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite, characterized in that the weight ratio of component A) to component B) from 5: 1 to 1:10 and the weight ratio of component B) to component C) is from 50: 1 to 1: 2. Mineral binder composition according to claim 1, characterized in that the mineral binder composition A) from 5 to 80% by weight of at least one pozzolanic or latent-hydraulic setting material, B) 15 to 80 wt .-% of at least one calcium sulfoaluminate and C) 1 to 40% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite, each based on the total weight of the mineral binder composition contains. Mineral binder composition according to one or more of claims 1 to 2, characterized in that the total amount of components A), B) and C) in the mineral binder composition is at least 50 wt .-%. Mineral binder composition according to one or more of claims 1 to 3, characterized in that the pozzolanic or latent-hydraulic setting material is a granulated slag, a fly ash or a silica fume. Construction-based product containing a mineral binder system according to one or more of claims 1 to 4. Construction-chemical product according to claim 5, characterized in that it further contains at least one filler. Structural product according to one or more of claims 5 to 6, characterized in that it is a tile adhesive, a joint filler, a filler, a sealing slurry or a mortar composition. Construction-chemical product according to one or more of claims 5 to 7, characterized in that it is a tile adhesive having the following constituents in the construction chemical product, wherein the following quantities are each based on the total weight of the construction chemical product and in each case to 100 Add wt.%: A) from 7.5 to 26.5% by weight of at least one pozzolanic or latently-hydraulically setting material, B) 7.5 to 26.5% by weight of at least one calcium sulfoaluminate, C) 1 to 10% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite, D) 0.05 to 0.6% by weight of at least one thixotropic and / or water retention agent, E) 0 to 13% by weight limestone flour, F) 0 to 65% by weight of quartz sand, G) 0 to 40% by weight of at least one light filler, H) 0 to 3 wt .-% of at least one dedusting additive and I) 0 to 15 wt .-% further auxiliaries and additives. Construction product according to one or more of claims 5 to 7, characterized in that it is the construction chemical product is a Fugenfüller having the following constituents, wherein the following quantities are each based on the total weight of the construction chemical product and in each case to 100 Wt .-% add: A) 2 to 25 wt .-% of at least one pozzolanic or latent-hydraulic setting material, B) 2 to 25 wt .-% of at least one calcium sulfoaluminate, C) 1 to 10 wt .-% of at least one calcium sulfate -Hemihydrate and / or calcium sulfate anhydrite, D) 0.05 to 0.6 wt .-% of at least one thixotropic and / or water retention agent, E) 0 to 80 wt .-% limestone, marble powder and / or dolomite flour, F) 0 to 65 wt .-% quartz sand, G) 0 to 3 wt .-% of at least one dedusting additive and H) 0 to 15 wt .-% further auxiliaries and additives. Construction-chemical product according to one or more of claims 5 to 7, characterized in that it is a self-leveling putty which has the following constituents, wherein the following amounts are in each case based on the total weight of the construction chemical product and each on Add 100% by weight: A) from 7.5 to 26.5% by weight of at least one pozzolanic or latently-hydraulically setting material, B) 7.5 to 26.5% by weight of at least one calcium sulfoaluminate, C) 1 to 10% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite, D) 0.05 to 0.6% by weight of at least one thixotropic and / or water retention agent, E) 0 to 13% by weight limestone flour, F) 0 to 65% by weight of quartz sand, G) 0.1 to 4% by weight of at least one liquefier, superplasticizer and / or flow agent, H) 0 to 3 wt .-% of at least one dedusting additive and I) 0 to 15 wt .-% further auxiliaries and additives. Construction-chemical product according to one or more of claims 5 to 7, characterized in that it is a cementitious Dichtschlämme having the following constituents in the construction chemical product, wherein the following quantities are each based on the total weight of the construction chemical product and each on Add 100% by weight: A) from 7.5 to 26.5% by weight of at least one pozzolanic or latently-hydraulically setting material, B) 7.5 to 26.5% by weight of at least one calcium sulfoaluminate, C) 1 to 10% by weight of at least one calcium sulfate hemihydrate and / or calcium sulfate anhydrite, D) 0.05 to 0.6% by weight of at least one thixotropic and / or water retention agent, E) 0.03 to 0.7% by weight of silica sand, F) 0 to 40 wt .-% of at least one dispersion powder, G) 0.5 to 5 wt .-% of at least one dedusting additive and H) 0 to 15 wt .-% further auxiliaries and additives.