EP1846342A2

EP1846342A2 - Use of aliphatic hydrocarbons and hydrocarbon mixtures in powdery chemical products for construction

Info

Publication number: EP1846342A2
Application number: EP06706446A
Authority: EP
Inventors: Steffen Witzleben; Hans-Peter Sattler; Rolf Tenhaef; Petra Padurschel; Volker Runge
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 2005-02-09
Filing date: 2006-01-27
Publication date: 2007-10-24
Also published as: WO2006084588A2; DE102005005998A1; CN101115693A; KR20070101318A; DE202006020712U1; WO2006084588A3

Abstract

The invention relates to the use of hydrocarbons or hydrocarbon mixtures as additives for reducing the dust caused by dry, especially powdery chemical products for construction, especially hydraulically binding or cement-based materials, such as tile adhesives, jointing mortar, filler, sealing materials and the like. Such dedusting additives based on hydrocarbons or hydrocarbon mixtures create a long-lasting dedusting effect on the chemical products treated therewith, an effect which is maintained both in closed storage and in open storage, especially under atmospheric oxygen, without affecting the treatment and application characteristics of the chemical products for construction treated in this way.

Description

Use of aliphatic hydrocarbons and hydrocarbon mixtures in powdered construction chemicals

The present invention relates to the reduction or minimization of dust emissions when handling dry, in particular powdered construction chemical products such as hydraulically setting or cement-based masses, such. As tile adhesives, joint fillers, fillers, sealing slurries and the like.

In particular, the present invention relates to the reduction and / or minimization of dust emission when handling dry, in particular powdered construction chemical products (eg gypsum-based or cementitious formulations), in particular when emptying sacks with such systems as contents.

The present invention thus relates in particular to the use of hydrocarbons or hydrocarbon mixtures as additives for reducing and / or preventing the dusting of dry, in particular pulverulent construction chemical products, such as hydraulically setting or cement-based materials (eg tile adhesives, joint fillers, fillers, sealing slurries and the like). , Furthermore, the present invention relates to a method for producing dry, in particular pulverulent construction chemical products with reduced dusting behavior and the products produced in this way as such.

Dry, in particular pulverulent construction-chemical products, such as hydraulically setting or cement-based compounds (for example tile adhesives, joint fillers, fillers, sealing slurries and the like) lead to a significant formation of dust during transfer and mixing processes. Therefore, numerous attempts have been made to reduce or prevent dust generation in such products.

For example, attempts were made to prevent the formation of dust in hydraulically setting

To reduce masses, such as putties, on the degree of grinding or the grain composition of the powdered products, but the processability of coarser powder is deteriorated. Another known method is the aggregation z. B. with water, aqueous solutions or dispersions. For example, from US-A-4 780 143 it is known to add clinker prior to grinding to cement to reduce dust formation with aqueous foam. Also, additions of plastic dispersions to cement for shotcrete compositions have been proposed to reduce dust formation. A temporary aggregation in hydraulically setting masses is only of no significance if the products are subsequently milled o- z. B. should be used as shotcrete or sprayed mortar. For example, in finely powdered putties to which floor coverings are to be applied after application, coarser aggregations are unacceptable as they appear on the surface of many smooth floor covering materials.

Similarly, it is known to add to the mixing water of cement dust reducing agent to reduce the dust during spray application. For this purpose, for example, polyethylene glycols or ethylene oxide / propylene oxide block copolymers are used as dust binders or additives for reducing dust formation. However, such additives often impair the processing behavior, in particular they can lead to an undesirable set delay and a hygroscopy of the construction chemical products, which is undesirable and unsuitable. On the other hand, if hydrophobic additives, which also include a large number of previously known ethylene oxide / propylene oxide block copolymers, are used to reduce the formation of dust, wetting difficulties arise for the pulverulent construction-chemical products.

In EP 0 403 874 B2, as effective additives for reducing the dust formation behavior of dry, hydraulically setting compounds, in particular cementitious surfacers, there are special ethylene oxide / propylene oxide block copolymers formed by addition of ethylene oxide onto polypropylene glycol at 5 to 35 wt .-%, based on the total weight of the block copolymers, of ethylene oxide groups and a number average molecular weight of propylene glycol in the range of 1,500 to 3,000 proposed. The disadvantage here, however, is that there be additives are relatively expensive and, in order to achieve a significant effect, often larger quantities must be used.

Likewise, it has been proposed to reduce the dusting behavior of cement-based compositions by the addition of polytetrafluoroethylene fibers in the presence of alcohol and / or silicone-based defoaming agents (US Pat. No. 6,464,776). However, the use of such fibers is not always sufficient to minimize dust formation in an optimal manner and with great reliability.

The problem underlying the present invention is thus to provide an efficient system for reducing or preventing the formation of dust when handling dry, in particular pulverulent chemical construction products, which at least largely avoids or at least attenuates the above-described problems of the prior art.

Another object of the present invention is to provide a dust reducing agent, i. H. an additive for reducing or reducing the dusting or dust formation of dry, in particular pulverulent construction-mixing products, such as hydraulically setting or cement-based materials, eg. As tile adhesives, joint fillers, fillers, sealing slurries and the like. On the one hand, such an additive should lead to a reduction in the dusting tendency of such construction-chemical products, but on the other hand should at least not substantially impair their processability or application properties.

The Applicant has now surprisingly found that with hydrocarbons or hydrocarbon mixtures, the dusting behavior of dry, especially powdered construction chemical products such. B. hydraulically setting or cement-based masses (eg., Tile adhesive, joint filler, Spach- telmassen, sealing slurries, etc.) can reduce or reduce in an efficient manner, without or without appreciable impairment of the processing or application properties of these products ( eg setting behavior, curing capacity, application, consistency, viscosity etc.). The present invention thus provides, according to a first aspect of the present invention, the use of hydrocarbons or hydrocarbon mixtures as additives for reducing the dusting of dry, in particular pulverulent, construction-mix products, in particular hydraulically setting or cement-based materials, such as tile adhesives, joint fillers, Leveling compounds, sealing slurries and the like.

The abovementioned additives for reducing dust (synonymously also referred to below as "dust-reducing agent", "Staubminderungsadditve", "dust removal additives" etc. or simply as "additives") based on hydrocarbons or hydrocarbon mixtures cause a long-term dedusting with respect to the hereby treated construction chemical Products which are retained both in closed storage and in open storage, especially under atmospheric oxygen.

The dedusting additives used according to the invention are generally stable to oxidation and, in particular, do not undergo any chemical reactions due to atmospheric oxygen, so that their dedusting properties with respect to the construction chemical products remain unchanged at least substantially over a long storage period.

At the same time, the setting behavior of the construction chemicals treated with the present invention dedusting hydrocarbon-based construction chemicals is maintained: During processing, especially mixing with water, one obtains an equivalent consistency and viscosity as in the case of construction chemicals without the addition of dedusting additives used in the invention, and also the order Setting behavior is not affected or disturbed. Incidentally, the dedusting additives used in the invention based on hydrocarbons and hydrocarbon mixtures are completely harmless also in terms of occupational and environmental protection, so that there are no application restrictions. Advantageously, according to the invention under normal conditions (ie 25 ^C C and atmospheric pressure) liquid hydrocarbons or hydrocarbon mixtures are used as dedusting additives. On the one hand, this has the advantage that liquid application forms can be applied better to the crop products to be dedusted and the application is more homogeneous than in the case of solid dedusting additives and, moreover, small amounts are used than in the case of solid dedusting additives. Also, the adhesion or initial adhesion of liquid additives or additive mixtures is improved in comparison to solid forms with respect to the building chemical products to be treated. Therefore, according to the invention, hydrocarbons or hydrocarbon mixtures which are liquid under normal conditions are preferably used as dedusting additives.

Nevertheless, it is according to the invention in principle not excluded, even under normal conditions (25 ⁰ C, atmospheric pressure) to use solid hydrocarbons or hydrocarbon mixtures, which for their application or impingement on the construction chemical products previously z. B. can be melted, to then be applied in the liquid state. However, under normal conditions (25 ⁰ C, atmospheric pressure) liquid hydrocarbons or hydrocarbon mixtures according to the invention for the above reasons contrast preferred.

However, it is crucial that in the case of using hydrocarbon mixtures, the resulting total mixture used is liquid, but the total mixture may well contain solid hydrocarbons, which should be dissolved in the liquid hydrocarbons, so that a total liquid hydrocarbon mixture results. Ie. The total hydrocarbon mixture used may well contain hydrocarbons which are solid as such under normal conditions (eg aliphatic hydrocarbon waxes), but which are dissolved in the remaining, liquid hydrocarbon components of the mixture, so that ultimately a total mixture results, which is liquid overall is (normal conditions, as previously defined). 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 aromatic fraction, based on the total hydrocarbons or total hydrocarbon mixtures used, advantageously not 30 wt .-%, preferably 20 wt .-%, preferably 17.5 wt .-%, more preferably 15 wt .-%, not exceed.

The hydrocarbons used in the invention as Entstaubungsadditive or hydrocarbon mixtures, in particular aliphatic hydrocarbons or hydrocarbon mixtures (optionally with aromatic fractions, as previously defined Defi-) preferably have boiling points or boiling ranges in the order of 100 to 400 ⁰ C, in particular 150 to 350 ⁰ C, preferably 200 to 300 ⁰ 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 de-dusting effect is achieved and no significant amounts of dedusting additive are volatilized over a period of storage. The abovementioned boiling points or boiling ranges relate in particular to the hydrocarbons or hydrocarbon mixtures which are liquid under normal conditions (25 ^° C. and atmospheric pressure) in the total mixture used as dedusting additive. If hydrocarbon mixtures are used which also contain a certain proportion of under normal Conditions (25 ⁰ C, atmospheric pressure) have solid hydrocarbons, but which are themselves dissolved in the liquid hydrocarbons, the aforementioned boiling point or boiling range information relate in particular only to the liquid components of the hydrocarbon mixtures used, while the boiling or boiling ranges of the solid Components may deviate from this, in particular may be above these values.

If the aliphatic hydrocarbons or hydrocarbon mixtures with the abovementioned properties, in particular with the abovementioned boiling points and boiling ranges, also contain aromatic fractions (eg aromatic hydrocarbons), their boiling points or boiling ranges should advantageously be above 100 ^° C., in particular above 150 ^° C. , preferably above 200 ⁰ C lie. This has the advantage that such aromatic hydrocarbons are generally non-volatile, so that a long-term dedusting effect is achieved and the treated construction chemical products are odorless or low odor. On the other hand, this ensures that the processing and application properties of the thus treated construction chemical products are not or not significantly impaired.

Generally, dedusting additives used according to the invention are hydrocarbons or hydrocarbon mixtures having more than 10 carbon atoms, in particular more than 15 carbon atoms, preferably more than 20 carbon atoms. In particular, hydrocarbons or hydrocarbon mixtures having a carbon number of between 10 and 100, preferably between 10 and 40, preferably between 15 and 30, are used as dust removal additives used according to the invention.

As far as the weight-average molecular masses of the hydrocarbons or hydrocarbon mixtures used are concerned, they can vary within a wide range. In general, these are in the range of 100 to 4,000 g / mol, in particular 100 to 2,000 g / mol, preferably 150 to 1,000 g / mol, more preferably 200 to 750 g / mol, most preferably 250 to 500 g / mol. Hydrocarbons or hydrocarbon mixtures preferably used according to the invention have a kinematic viscosity (ISO 3014 or DIN 51 562 / T1) at 20 ^° C. in the range from 30 to 150 mm ² / s, in particular from 30 to 100 mm ² / s, and / or one ki - nematic viscosity (ISO 3014 or DIN 51 562 / T1) at 40 ⁰ C in the range of 10 to 100 mm ² / s, in particular 15 to 50 mm ² / s, and / or a kinematic viscosity (ISO 3014 or DIN 51 562 / T1) at 100 ⁰ C in the range of 1 to 10 mm ² / s. In this way, it is ensured, in particular, that the hydrocarbons or hydrocarbon mixtures used can be applied simply and homogeneously to the construction chemical products to be treated or dedusted (for example in the spray application).

Hydrocarbons or hydrocarbon mixtures preferably used according to the invention have densities in the range from 800 to 900 kg / m ³ , in particular 825 to 875 kg / m ³ .

According to the invention, it is preferred if the hydrocarbons or hydrocarbon mixtures used as dedusting additives at a temperature of 107 ^° C. have an evaporation loss over 24 hours of less than 5% by weight, preferably less than 2% by weight, particularly preferably less than 1 % By weight, based on the hydrocarbons or hydrocarbon mixtures. To this

It is ensured that on the one hand a long-term dedusting is achieved with respect to the inventive treated building chemical products and on the other hand, the products treated according to the invention are at least substantially odorless or low odor, since no hydrocarbons or hydrocarbon mixtures are released in appreciable quantities.

As regards the amounts with which the dedusting additives used according to the invention are used based on hydrocarbons or hydrocarbon mixtures, they can vary within wide ranges. In general, the hydrocarbons or hydrocarbon mixtures used as dedusting additives, based on the dedusted construction chemical products, in amounts of 0.01 to 10 wt .-%, in particular 0.01 to 5 wt .-%, preferably 0.1 to 5 wt .-%, particularly preferably 0.2 to 2 wt .-%, 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 and application properties and on the other hand due to economic considerations, also in terms of technical feasibility. Nevertheless, depending on the application or individual case, it may be necessary or desirable to deviate from the abovementioned values, which is at the discretion of the person skilled in the art.

As described above, the hydrocarbons or hydrocarbon mixtures used according to the invention, when used as dedusting additives for dry, in particular pulverulent construction-chemical products, lead to a significant reduction or minimization of the release of dust when handling these products.

This effect can be further increased by the fact that the dry, in particular powdered construction chemical products additionally suitable fibers which achieve a certain dedusting effect, are added, for example, polyolefin fibers such. As polyethylene or polypropylene fibers, or cellulose fibers. Such fibers are used in particular in amounts of up to 2 wt .-%, preferably of up to 1 wt .-%, more preferably in the range of 0.1 to 1 wt .-%, based on the construction chemical products. Fiber preferably used according to the invention has fiber lengths in the range from 50 to 5000 μm, in particular 50 to 500 μm. However, due to the excellent dedusting action of the hydrocarbon-based dedusting additives used in the present invention, the additional use of fibers is generally not required.

With the dedusting additives based on hydrocarbons or hydrocarbon mixtures used according to the invention, it is generally possible to treat any construction-chemical products of all kinds. These include, in particular, hydraulically setting compounds or binders, in particular cementitious or cement-based compounds or binders, but also binders based on gypsum. Examples of such construction chemical products are tile adhesives, joint fillers, fillers, sealing slips, mortar compounds and the like. In the context of the present invention, hydraulically setting masses are understood in particular to be masses, for example based on cement and / or gypsum, which are used in particular for building purposes be used. Hydraulic masses or hydraulic binders is the usual name for generally finely ground, mineral substances that harden stone-like with water absorption in air and even under water and are water resistant after curing. Such construction chemical products are generally commercially available as fine powders, which are then applied to the construction site with water; in their handling, for. As when emptying sacks with which they are packaged, there is generally a strong dust, which can be effectively prevented or reduced by the use of the invention proposed dedusting based on hydrocarbons or hydrocarbon mixtures.

Likewise, the subject of the present invention, according to a second aspect of the present invention, is a process for the production of dry, in particular pulverulent construction chemical products, in particular hydraulically setting or cement-based materials (eg tile adhesives, joint fillers, fillers, sealing slurries, mortar compounds and the like) ) with reduced dusting behavior, wherein the building chemical products are brought into contact with a hydrocarbon-based dewatering additive as defined above. In general, this is done by spraying ("spraying") the dedusting additives on the construction chemical products, in particular in the case of liquid dedusting additives. In principle, however, it is also possible to use solid hydrocarbons or hydrocarbon mixtures as dedusting additives under standard conditions, which can advantageously be melted prior to their application to the construction chemicals to be dedusted and thus applied in the liquid state to the construction chemical products to be dedusted. Nevertheless, it is preferred according to the invention to use liquid dedusting additives based on hydrocarbons or hydrocarbon mixtures under normal conditions, because in this way a better handling of the dedusting additives is made possible, in particular a simpler and more homogeneous application to the dedusting construction chemical products is ensured - at the same time good adhesion or initial adhesion of dedusting additives with respect to the dedusting construction chemical products. However, the loading or contacting of the dedusting additives used according to the invention with the dedusting construction chemicals products can also be done in any other suitable manner, which is familiar to the expert, for. B. Mixing the dedusting construction chemical products with the liquid

Dedusting additives, etc. However, according to the invention, a spray application of the liquid dedusting additives is preferred because this is the simplest and most economical variant of applying the dedusting additives to the dedusting construction chemical products.

For further details of the process according to the invention for the production of construction chemical products with reduced dusting behavior can be made to avoid repetition of the above statements on the use of the invention, which apply correspondingly with respect to the inventive products.

Finally, the present invention - according to a third aspect of the present invention - also construction chemical products with reduced dust formation behavior, as they are obtainable by the inventive method.

In other words, the present invention is also building chemical products, in particular dry, powdered construction chemical products, with reduced dust retention behavior, the construction chemical products with a dedusting additive as defined above based on hydrocarbons or hydrocarbon mixtures, in particular in the aforementioned amounts, in Contact are brought or acted upon, in particular on its surface (ie at the surface of the individual particles, grains, granules, etc. of the dry mix of construction chemical products) are coated therewith.

As regards the construction-chemical products according to the invention with reduced dust-forming behavior, these contain the hydrocarbon-based dedusting additives used according to the invention, as defined above, in particular in amounts of from 0.01 to 10% by weight, in particular from 0.01 to 5% by weight 0.1 to 5 Wt .-%, particularly preferably 0.25 to 3 wt .-%, based on the powdered construction chemical products. Nevertheless, depending on the individual case or application, it may be necessary to deviate from the aforementioned quantities.

In accordance with the invention preferred building chemical products with reduced dusting behavior generally have a cement content in the range of 20 to 80 wt .-%, preferably 25 to 65 wt .-%, preferably 30 to 50 wt .-%, based on the construction chemicals on ,

In addition to the abovementioned dedusting additives and the abovementioned cement content and the fibers which may be present, construction-chemical products according to the invention with reduced dust formation behavior may also contain further ingredients or constituents, in particular quartz sand, limestone flour, thickening agents (eg based on cellulose ethers , Layered silicates, WoLastonites or starch ethers), dispersion powders (eg EVA powder), hardening accelerators (eg calcium salts and / or formates), sulfate carriers, defoamers, etc.

In addition, construction-chemical products according to the invention with reduced dust-forming behavior may contain lightweight aggregates. These lightweight aggregates typically have densities of less than 2000 kg / m ³ , preferably less than 1500 kg / m ³ , very particularly preferably less than 1200 kg / m ³ or even less than 1000 kg / m ³ . Suitable for this purpose are, for example, hollow hollow spheres made of glass, ceramic or plastic, expanded glass, expanded mica, expanded perlite, expanded slate, expanded clay, hard coal fly ash, brick chippings, natural pumice, tuff, lava slag granules and boiler sand. It can also be combined with each other two or more of these different lightweight aggregates. The use of these lightweight aggregates is particularly advantageous, as this can on the one hand, the specific weight of the overall formulation can be reduced while the special dust effect of lightweight aggregates can be prevented by the inventive use of hydrocarbons or hydrocarbon mixtures and these lightweight aggregates can be used without the disadvantage the strong dust formation. Even with higher amounts of lightweight aggregates, the formulations virtually do not dust. The amount of Light aggregates in the construction-chemical products according to the invention is usually between 2 and 50 wt .-%, in particular 3 to 40 wt .-%, particularly preferably 5 to 30 wt .-%, most preferably between 10 and 20 wt .-%. Preferred maximum amounts are 20% by weight, preferably 35% by weight, very particularly preferably 50% by weight.

The construction-chemical products according to the invention with reduced dust formation behavior can be construction-chemical products of all kinds, in particular hydraulically setting or cement-based materials, such as, for example, As tile adhesive, joint filler, fillers, sealing slurries, mortar, cement and the like. In this regard, reference may be made to the above statements.

Construction chemical products according to the invention with reduced dust formation behavior, in particular in the form of dry, preferably pulverulent compositions, may contain, for example, the following constituents, the following quantities being based in each case on the construction chemical products:

Cement 20 to 80 parts by weight, preferably 25 to 65 parts by weight, preferably 30 to 50 parts by weight

Dust removal additive (s) 0.01 to 10 parts by weight, in particular 0.01 to 5 parts by weight, preferably 0.1 to 5 parts by weight, particularly preferably 0.25 to 3 parts by weight

optionally fibers up to 2 parts by weight, preferably up to 1 part by weight, more preferably 0.1 to 1 part by weight

optionally quartz sand 0 to 70 parts by weight, in particular 10 to 60 parts by weight

optionally limestone flour 0 to 65 parts by weight, in particular 10 to 40 parts by weight

optionally thickener 0 to 2 parts by weight, in particular 0.2 to 1 parts by weight If appropriate, dispersion powder 0 to 15 parts by weight, in particular 1 to 10

Parts by weight

Optionally (hardening) accelerator 0 to 2 parts by weight, in particular 0.1 to 1.5

Parts by weight

Optionally sulphate carrier 0 to 10 parts by weight, in particular 0.1 to 10 parts by weight

If necessary defoamer 0 to 2 parts by weight, in particular 0.1 to 1 part by weight

parts

• if necessary, lightweight aggregates 2 to 50 parts by weight, in particular 3 to 40 wt.

parts

For further details, to the construction chemical products according to the invention with reduced dust formation behavior, reference may be made to the above statements on the use according to the invention and the process according to the invention, which apply correspondingly with respect to the products according to the invention in order to avoid repetitions.

Further embodiments, modifications and variations as well as advantages of the present invention will be readily apparent to and realizable by those skilled in the art upon reading the description without departing from the scope of the present invention. The effectiveness of dedusting was determined visually and by means of a particle size analysis. WORKING EXAMPLES

Examples 1 to 4:

In the following Examples 1 to 4 pulverulent construction chemical products in the form of dry, hydraulically setting masses in powder form (Example 1: tile adhesive; Example 2: joint filler; Example 3: self-leveling filler; Example 4: cementitious sealing sludge) described in the invention Are treated so that they are free of dust.

For purposes of the treatment according to the invention, the individual components of the mixture are mixed homogeneously and then mixed with the special dedusting or coating additive (here: aliphatic mineral or paraffin oil, in particular white oil, eg n-paraffin oil with a molecular weight of approx 250 g / mol), in particular by spraying, so that pulverulent crop-shaped products according to the present invention result, in which dust generation (eg when pouring or transferring these products) is minimized or prevented. The corresponding dedusting effect is evident over several weeks, both in open storage and under storage. This demonstrates the long-term stability of the dedusting effect with the mineral or paraffin oil-based additives used according to the invention. The processing properties (eg setting behavior, consistency, viscosity, application behavior, etc.) are maintained as in the case without additive, i. H. these properties are not impaired by the treatment according to the invention.

Example 1:

Tile glue:

Cement 25 - 60%

Quartz sand 0.1 - 0.7 mm 10 - 60%

Limestone flour <0,5 mm 0 - 40%

Thickener 0.2 - 1.0%

Dispersion powder 0 - 15%

Hardening accelerator 0 - 1, 5% Entstaubungsadditiv

(aliphatic mineral or paraffin oil) 2 - 5%

Example 2:

Fuqenfüller:

Cement 15 - 35%

Quartz sand 0.1 - 0.7 mm 0 - 65% Limestone powder <0.5 mm 0 - 65%

Thickener 0 - 0.8%

Dispersion powder 0 - 5%

Hardening accelerator 0 - 0.5%

Dedusting additive (aliphatic mineral or paraffin oil) 2 - 5%

Example 3:

Self-leveling putty:

Cement 5 - 40%

Calcium aluminate cement 0 - 40%

Quartz sand 0.1 - 0.7 mm 10 - 40%

Limestone powder> 0,5 mm 0 - 40%

Gradient 0.5 - 4%

Dispersion powder 0 - 4%

Sulfate carrier 0 - 10%

Defoamer 0 - 0.5%

Accelerator 0 - 0.5%

Entstaubungsadditiv

(aliphatic mineral or paraffin oil) 2 - 5% Example 4:

Cementitious sealing slurries:

Cement 10 - 40%

Quartz sand 0,03 - 0,7 mm 40 - 70%

Dispersion powder 0 - 40%

Dedusting additive (aliphatic mineral or paraffin oil) 0,5 - 4%

In the aforementioned formulations of Examples 1 to 4 can be used as Entstaubungsadditive aliphatic mineral or paraffin oils, as they are sold in technical quality, for example, by the company Shell or MERKUR Vaseline GmbH & Co. KG, Hamburg. Such mineral or paraffin oils advantageously have boiling ranges from 200 to 300 ^° C. (atmospheric pressure), kinematic viscosities (DIN 51 562 / T1 or ISO 3014) at 40 ^° C. in the range from 15 to 50 mm ² / s and densities in the range from 800 to 900 kg / m ³ .

Example 5 to 15:

Furthermore, the dedusting additives of Examples 1 to 4 based on aliphatic mineral or paraffin oils (Examples 5A to 5D) used according to the invention were compared with dedusting additives of other classes of substances (Examples 6 to 19). The results are shown in Table 1 below.

A comparison of the dedusting additives used according to the invention with dedusting additives of other substance classes shows that only the dedusting additives based on aliphatic hydrocarbon mixtures used according to the invention provide a good immediate effect with respect to dedusting, which also over a longer storage period - both open and closed storage - Is maintained, while also an equivalent processing, in particular an excellent setting behavior and an equivalent consistency, as in the case without additive is maintained. On the other hand, in the case of non-inventive dedusting additives (Examples 6 to 19), either no good long-term dusting was detected or other disadvantages, such as an unpleasant, distinct odor, no equivalent processing (for example setting disruption or altered consistency), appeared Degradation of dedusting additives, in particular by oxidation with atmospheric oxygen.

Example 16:

Tile glue:

Cement 25 - 60%

Quartz sand 0.1 - 0.7 mm 10 - 50%

Lightweight filler 3 - 20% Thickener 0,2 - 1, 0%

Dispersion powder 0 - 15%

Hardening accelerator 0 - 1, 5%

Entstaubungsadditiv

(aliphatic mineral or paraffin oil) 2 - 5%

Table 1

CD

Table 1 (continued)

K)

O

Claims

claims:

1. Use of hydrocarbons or hydrocarbon mixtures as additives for reducing the dusting of dry, in particular powdered construction chemical products, in particular hydraulically setting or cement-based materials, such as tile adhesive, joint filler, fillers, sealing slurries and the like.

2. Use according to claim 1, characterized in that the hydrocarbons or hydrocarbon mixtures used under normal conditions (25 ⁰ C, atmospheric pressure) are liquid.

3. Use according to claim 1 or 2, characterized in that aliphatic hydrocarbons or hydrocarbon mixtures, in particular linear or branched, preferably linear, saturated or unsaturated, preferably saturated aliphatic hydrocarbons or hydrocarbon mixtures, preferably with boiling points or boiling ranges of 100 as hydrocarbons or hydrocarbon mixtures to 400 ^C C, in particular 150 to 350 ⁰ C, preferably 200 to 300 ⁰ C ₁ based on atmospheric pressure, can be used.

4. Use according to one or more of the preceding claims, characterized in that hydrocarbons or hydrocarbon mixtures having more than 10 carbon atoms, in particular more than 15 carbon atoms, preferably more than 20 carbon atoms, are used and / or hydrocarbons or hydrocarbon mixtures having a carbon number between 10 and 100, preferably between 10 and 40, preferably between 15 and 30, are used and / or hydrocarbons or hydrocarbon mixtures having weight-average molecular masses of 100 to 4000 g / mol, in particular 100 to 2000 g / mol, preferably 150 to 1,000 g / mol, more preferably 200 to 750 g / mol, very particularly preferably 250 to 500 g / mol are used 5. Use according to one or more of the preceding claims, characterized in that the hydrocarbons or hydrocarbon mixtures also contain aromatic components, in particular aromatic hydrocarbons, preferably with boiling points or boiling ranges above 100 ⁰ C, in particular above 150 ⁰ C, preferably above 200 ^° C., in particular wherein the aromatic fraction, based on the hydrocarbons or hydrocarbon mixtures, is not more than 30% by weight, preferably not more than 20% by weight, preferably not more than 17,

5 wt .-%, particularly preferably at most 15 wt .-%, is

6. Use according to one or more of the preceding claims, characterized in that the hydrocarbons or hydrocarbon mixtures used have a kinematic viscosity (ISO 3014 or DIN 51 562 / T1) at 20 ^C C in the range of 30 to 150 mm ² / s, in particular 30 to 100 mm ² / s, and / or that the hydrocarbons or hydrocarbon mixtures have a kinematic viscosity (ISO 3014 or DIN 51 562 / T1) at 40 ⁰ C in the range of 10 to 100 mm ² / s, in particular 15 to 50 mm ² / s, and / or that the hydrocarbons or hydrocarbon mixtures have a kinematic viscosity (ISO 3014 or DIN 51 562 / T1) at 100 ⁰ C in the range of 1 to 10 mm ² / s.

7. Use according to one or more of the preceding claims, characterized in that the hydrocarbons or hydrocarbon mixtures densities in the range of 800 to 900 kg / m ³ , in particular 825 to 875 kg / m ³ , and / or that the hydrocarbons or hydrocarbon mixtures at 107 ⁰ C have a loss of evaporation over 24 hours of less than 5 wt .-%, preferably less than 2 wt .-%, particularly preferably less than 1 wt .-%, based on the hydrocarbons or hydrocarbon mixtures.

8. Use according to one or more of the preceding claims, characterized in that the hydrocarbons or hydrocarbon mixtures in amounts of 0.01 to 10 wt .-%, in particular 0.01 to 5 wt .-%, preferably 0.1 to 5 wt .-%, particularly preferably 0.25 to 3 wt .-%, are used, based on the construction chemical products.

9. Use according to one or more of the preceding claims, characterized in that the building chemical products additionally fibers, in particular polyolefin fibers, such as polyethylene or polypropylene fibers, or cellulose fibers are added, in particular in amounts of up to 2 wt. %, preferably up to 1 wt .-%, particularly preferably in the range of 0.1 to 1 wt .-%, based on the construction chemical products, in particular wherein the fibers have fiber lengths in the range of 50 to 5000 microns, especially 50 to 500 microns , exhibit.

10. Use according to one or more of the preceding claims, characterized in that the construction-chemical products have a cement content in the range of 20 to 80 wt .-%, preferably 25 to 65 wt .-%, preferably 30 to 50 - wt .-%, based on the construction chemicals.

11. A process for the preparation of dry, in particular pulverulent construction chemical products with reduced dust fatigue, characterized in that one brings the construction chemical products with at least one dedusting additive based on hydrocarbons or hydrocarbon mixtures, as defined in one or more of the preceding claims, in particular by Spraying or the like.

12. Dry, in particular pulverulent construction-chemical products with reduced dust-boring behavior, obtainable by the process according to claim 11.

13. Dry, in particular powdered construction chemical products with reduced dust formation behavior, characterized in that the pulverulent construction chemical products with at least one dedusting additive based on hydrocarbons or hydrocarbon mixtures, as defined in one or more of the preceding claims, are contacted or acted upon, in particular coated on its surface hereby.

14. construction-chemical products with reduced dust formation behavior according to claim 12 or 13, characterized in that the construction chemical products or dedusting additives based on hydrocarbons or hydrocarbon mixtures in amounts of 0.01 to 10 wt .-%, in particular 0.01 to 5 wt .-%, preferably 0.1 to 5 wt .-%, particularly preferably 0.25 to 3 wt .-%, based on the construction chemical products.

15. Building chemical products with reduced dust formation behavior according to one or more of claims 12 to 14, characterized in that the construction chemical products hydraulically setting and / or cement-based masses or binders, such as tile adhesive, joint fillers, fillers, Dichtschlä- me, mortar, cement and the like, and / or that the construction chemical products have a cement content in the order of 20 to 80 wt .-%, preferably 25 to 65 wt .-%, preferably 30 to 50 wt .-%, based on the construction chemical products.

16. Building chemical products with reduced dusting behavior, in particular according to one or more of claims 12 to 15, in particular in the form of dry, preferably pulverulent compositions, characterized by the following constituents, wherein the following quantities are each based on the construction chemical products:

Cement 20 to 80 parts by weight, preferably 25 to 65

Parts by weight, preferably 30 to 50 parts by weight Dust removal additive (s) 0.01 to 10 parts by weight, in particular 0.01 to 5 parts by weight, preferably 0.1 to 5 parts by weight, particularly preferably 0.25 to 3 parts by weight

optionally fibers up to 2 parts by weight, preferably up to 1 part by weight, more preferably 0.1 to 1 parts by weight

optionally thickener 0 to 2 parts by weight, in particular 0.2 to 1 parts by weight

if appropriate, dispersion powder 0 to 15 parts by weight, in particular 1 to 10 parts by weight

optionally (hardening) accelerator O to 2 parts by weight, in particular 0.1 to 1.5

Parts by weight

if necessary defoamer 0 to 2 parts by weight, in particular 0.1 to 1 wt. ' parts