DE102008020737A1 - Use of hydrocarbons as additives to reduce the dusting of construction chemicals - Google Patents

Abstract

The present invention contemplates the use of hydrocarbons or hydrocarbon mixtures having a kinematic viscosity at 20 ° C in the range of 0.1 to 25 mm 2 / s and / or 40 ° C in the range of 1.0 to 7 mm 2 / s as reducing additives the dusting of dry, construction chemical products and especially of hydraulically setting or cement or gypsum-based materials such as tile adhesives, joint fillers, fillers and sealing slurries. The proposed dedusting additives cause a stable long-term dedusting effect, whereby the processing and application properties of the treated construction chemical products are not affected.

Description

object The present invention is the use of hydrocarbons or hydrocarbon mixtures as additives for reducing the Dusting dry, chemical products and a method for Production of such products.

dry in particular powdered construction chemical products, such as hydraulic setting or cement-based compounds (eg tile adhesives, joint fillers, Spackling compounds, sealing slurries) in particular at Transfer and mixing processes to a significant dust formation. Therefore, numerous attempts have been made to control the generation of dust in such products to avoid or completely prevent.

So For example, attempts were made to prevent the formation of dust in hydraulically setting Masses on the degree of grinding or the grain composition of to reduce powdered products, but the Processability of coarser powder significantly worsened is.

Another known method is the aggregation of finely divided particles z. B. with the aid of water, aqueous solutions or dispersions. So is, for example, from the US 4,780,143 It is known to add clinker to cement to reduce dust formation prior to grinding to cement. Attempts have also been made to add plastic dispersions to sprayed concrete cements so as to reduce dust formation. However, such aggregation is disadvantageous if the thus dedusted hydraulically setting masses are subsequently no longer ground. In finely powdered putties, coarser aggregations are unacceptable because they are clearly visible on smooth surfaces.

Also known is the use of so-called dust reducing agents, which are added to the mixing water of cement to dusting when applying shotcrete or sprayed mortar. In particular, polyethylene glycols or ethylene oxide / propylene oxide block copolymers are used for this purpose as a dust binder or additives to reduce dust formation used. However, such additives often affect the processing behavior negative, since they in particular to a Retardation or pronounced hygroscopy lead the construction chemical products. Alternatively, use hydrophobic Additives, which also include ethylene oxide / propylene oxide block copolymers belong, arise mainly in powdered construction chemicals wetting difficulties.

From the WO 2006/084588 A1 the use of aliphatic hydrocarbons and hydrocarbon mixtures as additives for reducing the dusting of dry and especially powdered construction chemical products such as tile adhesives, joint fillers, fillers, sealing slurries, etc. is known. In particular hydrocarbons are described which are liquid under normal conditions, wherein aliphatic hydrocarbons, especially in linear or branched, saturated or unsaturated form, with boiling points of 100 to 400 ° C are particularly mentioned. Especially hydrocarbons with more than 10 carbon atoms should be particularly well suited. Particularly advantageous hydrocarbons in the present context represent those representatives which have a kinematic viscosity at 20 ° C in the range of 30 to 150 mm ² / s and / or at 40 ° C in the range of 10 to 100 mm ² / s. A disadvantage of the systems described there is the mentioned high viscosity of the hydrocarbons used, which requires a high consumption and thus a reduced efficiency of the additives used.

The utility model DE 20 2006 016 797 U1 relates to a low-dust dry mortar, which contains at least one dust-reducing component in an amount of 0.01 to 10 wt .-%, based on the total dry mixture. The dust-reducing component is selected here from the series of monoalcohols, such as. For example, 3-methoxybutanol, benzyl alcohol, 1,2-propanediol, hexanol, diacetone alcohol, Ethyldigly-kol, isopropanol, 2-ethylhexanol and / or alkanediols such as 2-methylpentane-2,4-diol, Neopenthylglykol and n-butane-2, 5-diol. According to this publication, glycols, polyethylene glycols, fatty alcohols and polyphenyl alcohols are also suitable. Particular mention is made of aliphatic ethers, cellulose ethers, alkoxylates and methyl / ethyl fatty acid ethers.

With All the measures described could solve the fundamental problem dusting of chemical mixtures still not especially from an economic point of view, satisfactory be solved.

The present invention was therefore based on the object of providing an additive, with which the dusting of dry, chemical products can be significantly reduced. Such additives should be characterized by a simple form of application with high effectiveness. In addition, they should not tend to form lumps in the application and also do not adversely affect the final properties of the products. Furthermore, the sustained high effectiveness of the additives over a longer period was desirable.

This object was achieved by the use of hydrocarbons or hydrocarbon mixtures having a kinematic viscosity at 20 ° C in the range of 0.1 to 25 mm ² / s and / or hydrocarbons or hydrocarbon mixtures with a kinematic viscosity at 40 ° C in the range of 1 , 0 to 7 mm ² / s.

The specified kinematic viscosities are in accordance with ISO 3014 and or DIN 51 562 / T1 determined.

apart that the task in relation to all Specifications could be fulfilled completely surprisingly found that the used Hydrocarbons or hydrocarbon mixtures with the invention essential Viscosities show a significantly increased effectiveness.

Representatives of the hydrocarbons which have a kinematic viscosity in the range from 5.0 to 20 mm ² / s at 20 ° C. have proved to be particularly advantageous. In the range mentioned, the following viscosities are especially suitable: 0.2, 0.4, 0.5, 0.6, 0.8, 1.0, 2.0, 3.0, 4.0, 5.0 , 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18 , 0, 19.0, 20.0, 21.0, 22.0, 23.0 and 24.0 mm ² / s. At 40 ° C the following viscosities are suitable: 1,2, 1,4, 1,5, 1,6, 1,8, 2,0, 2,5, 3,0, 3,5, 4,0, 4 , 5, 5.0, 5.5, 6.0, 6.5 mm ² / s.

Especially In the context of the present invention, cyclic hydrocarbons are suitable or mixtures thereof, and especially those with 3 to 70 and especially preferably 5 to 30 carbon atoms.

apart from the kinematic viscosities at 20 and or 40 ° C are the hydrocarbons suitable according to the invention not subject to any particular restriction. So have yourself Hydrocarbons or hydrocarbon mixtures in principle in the sense of the present invention proved suitable, the one weight average molecular mass of 100 to 500 g / mol, in particular from 130 to 380 g / mol and more preferably from 150 to 300 g / mol exhibit.

to Dust reduction is within the scope of the present invention in particular, such dust reducing agents, dust reducing additives or dedusting additives, their hydrocarbon representatives are selected from the series of hydrogenated butene tetramers, the iso or n-paraffinic hydrocarbons and the aliphatic and cyclic hydrocarbons. Isoalkanes with 9-12 carbon atoms are particularly suitable.

Especially It has proved advantageous if according to the invention each hydrocarbon used in liquid Form to be used. The advantage of this variant is to see that liquid applications are better at the can deduct to dedusting, construction chemical products and that the order overall compared to fixed variants homogeneous he follows. In addition, in the case of liquid hydrocarbons lower quantities needed. Of course Adhesion or initial adhesion are also more fluid Improved additives compared to solid variants. The term "liquid" correlates of course, with the viscosity essential to the invention at 20 ° C and 40 ° C, with predominantly the thin liquid area is meant.

The dry, chemical construction products dedusted by the additive according to the invention should be in the context of the present invention preferably in powder form and / or powdery constituents have, wherein the average particle size in the respective construction chemical products preferably from 0.1 to 5 mm should be enough. It has proved to be particularly advantageous if the construction chemical products have a particle size fraction from 2 to 10% ≤ 68 μm and 10 to 30% ≤ 200 μm exhibit. Especially with the very finely divided variants that comes Dedusting potential of the invention used Hydrocarbons particularly evident.

In principle, any desired dry, chemical construction products can be significantly dedusted with the hydrocarbons used according to the invention. However, the use according to the invention has proven to be particularly advantageous when it comes to the construction chemical products hydraulically setting or cement-based compositions and in particular tile adhesives, joint fillers, fillers, sealing slurries, repair mortars, leveling mortar, reinforcing adhesive, adhesive for thermal insulation composite systems (ETICS), mineral plasters, fine putty, screed systems, thick bed mortar, surface protection systems and pigment preparations. Representative of the hydraulically setting cement-based or gypsum-based compositions should be mentioned in particular those in which finely ground mineral substances harden under stone uptake in air or under water stone-like and are water resistant after curing. In fact, such products are generally sold as fine powders, which are then added to the mixing water in the final mixing at the construction site. When decanting or emptying the transport container then it comes to the adverse strong dust, which can be significantly reduced or completely prevented by the use of hydrocarbons now proposed.

Especially suitable for the invention used Additives are powdered polymers and in particular redispersible Polymer powder or tile adhesive, which represent the construction chemical products or which are present as their powdery constituents. The redispersible polymer powders mentioned are preferably at least one member of the series vinyl acetate, styrene, butadiene, Ethylene, versatic acid vinyl ester, urea-formaldehyde condensation products and melamine-formaldehyde condensation products built.

Around Dusting or dust reduction in the desired advantageous To actually achieve scale, recommends it is the hydrocarbons or hydrocarbon mixtures that dry, chemical product in an amount of 0.1 to 1.5 Wt .-%, preferably from 0.3 to 1.2 wt .-% and particularly preferably from 0.5 to 1.0 wt .-% add.

Of course can each dedusting building chemical products, where the additives are added according to the invention, in addition to the mentioned finely divided particles additionally at least a representative of the series binders, fillers, aggregates, Additives, organic or inorganic fibers and pigments.

in principle It is recommended that the chemical products used in the framework of the dedusted to the present invention, a share of hydraulic binder in the range of 20 to 80 wt .-%, preferably from 25 to 70% by weight and more preferably from 30 to 55% by weight exhibit.

Next the proposed use includes the present invention also a method for producing dry and in particular powdered construction chemical products with a reduced dust formation and dustiness. This method is according to the invention by characterized in that the building chemical products with at least a hydrocarbon or hydrocarbon mixture as dedusting additive brings into contact, which is done in particular by spraying should. The hydrocarbons or hydrocarbon mixtures used here have the properties already mentioned, in particular their kinematic viscosity at 20 ° C and / or 40 ° C is to be mentioned.

From Finally, the present invention is also dry and in particular powdery, construction chemical products with includes that reduced dusting and dusting behavior and can be produced by the method just described, namely through contact and especially through Spraying.

in the Generally, the already mentioned several times admission takes place or bring into contact by spraying or spraying the respectively selected dedusting or Staubminderungsadditive on the construction chemical products. In this way, the homogeneous Application in a simple manner with simultaneous good adhesion and initial adhesion be guaranteed. Of course you can bringing the finely divided, chemical products into contact with the respective additive in any other suitable way and Done way, as they are familiar to the expert. In Question come here in particular, the normal mixing or mixing the liquid additives, but the spray application clearly to be preferred, as this is the simplest and most economical represents the most attractive order variant.

Finally, as a final subject matter, the present invention comprises a construction chemical product having a reduced dusting and dusting behavior. This product is in turn advantageously to hydraulically setting and / or cement or gypsum-based compounds or binders such. B. dry mortar and tile adhesives, grouts, fillers, sealing slurries, repair mortar, leveling mortar, reinforcing adhesive, ETICS adhesive, mineral plasters, fine filler, Screed systems, thick bed mortars, surface protection systems and pigment preparations.

The employed in the context of the use according to the invention Additives can be used in their dust reduction or dedusting effect Of course, by all other suitable Additives are supported. Even if the proposed Hydrocarbons with defined viscosity in the majority of applications are completely sufficient to make the dusting behavior drier, to reduce building chemicals or completely closed it can be useful in special cases be, the beneficial effect of these additives by other additives to support, which in turn also mitigating the dusting behavior act.

All in all be with the proposed hydrocarbons or hydrocarbon mixtures with defined viscosity additives available to make dry, chemical products easy to use and economical manner be dedusted homogeneous and stable can, so in particular, from the point of view Occupational safety, especially during the transfer and processing process a clear progress is noted.

The The following examples illustrate the advantages of the present invention Invention.

Examples:

Dry mortar mixtures: tile adhesive 1 Portland cement CEM I 60.5% by weight Quartz sand 0.1-0.5 mm 23.6% by weight Limestone flour <0.1 mm 10.5% by weight cellulose ethers 1.9% by weight Dispersion powder (Elotex AP 200) 3.0% by weight Hardening accelerator (calcium formate) 0.5% by weight Tile Adhesive 2 Portland cement CEM I 38.0% by weight Quartz sand 0.1-0.5 mm 51.5% by weight Limestone flour <0.1 mm 5.0% by weight cellulose ethers 1.0% by weight Dispersion powder (Elotex AP 200) 4.0% by weight Hardening accelerator (calcium formate) 0.5% by weight grouts Portland cement CEM I 36.5% by weight Quartz sand 0.1-0.2 mm 51.8% by weight Limestone flour <0.1 mm 8.0% by weight cellulose ethers 2.2% by weight Dispersion powder (Vinnapas 7031 H) 1.0% by weight Hardening accelerator (calcium formate) 0.5% by weight Self-leveling putty Portland cement CEM III 6.5% by weight alumina cement 12.0% by weight Quartz sand 0.03-0.1 mm 32.5% by weight Limestone flour <0.1 mm 42.3% by weight Leveling Agent (Mement F 10) 0.1% by weight sulphate carrier 5.0% by weight Dispersion powder (Vinnapas 4010 L) 1.0% by weight Defoamer (Agitan P) 0.1% by weight Hardening accelerator (calcium formate) 0.5% by weight Flexible sealing slurry Portland cement CEM I 13.5% by weight Quartz sand 0.01-0.2 mm 55.5% by weight Limestone flour <0.1 mm 5.5% by weight Dispersion powder (Vinnapas 5044 N) 25.0% by weight Hardening accelerator (calcium formate) 0.5% by weight

Measurement Method

The measurements were based on DIN 55999-2 "Determination of a measure of the dust evolution of pigments and fillers - Part 2: Case method" performed.

to Measurement became the "dust measuring device SP3" of the Company LORENZ MESSGERÄTEBAU used.

sample preparation

• BASF GK 1778: hydriertes Buten-Tetramer, Fp 129°C, Siedebereich >280°C

Staubzahl nach 0d Staubzahl nach 28d Fliesenkleber 2 (Vergleich) 150 250 Fliesenkleber 2 + 3% Weissöl (Vergleich) 5 5 Fliesenkleber 2 + 0,5% Cobersol H190 (Erfindung) 10 25

• Cobersol H190: alipat. + überwiegend cyclische Kohlenwasserstofffraktion

Staubzahl nach 0d Staubzahl nach 28d Fugenmörtel (Vergleich) 100 150 Fugenmörtel + 3% Weissöl (Vergleich) 10 10 Fugenmörtel + 1,5% Cobersol C120P (Erfindung) 5 5

• Cobersol C120P: aliphat. + überwiegend cyclische Kohlenwasserstofffraktion

Staubzahl nach 0d Staubzahl nach 28d Selbstverlaufende Spachtelmasse (Vergleich) 100 200 Selbstverlaufende Spachtelmasse +1 Weißöl 25 30 Selbstverlaufende Spachtelmasse + 1% Cobersol C120P 5 20 Staubzahl nach 0d Staubzahl nach 28d Flexible Dichtungsschlämme (Vergleich) 350 350 Flexible Dichtungsschlämme 50 90 1% + Pionier 1139 (Erfindung) Flexible Dichtungsschlämme + 1% Cobersol C120P (Erfindung) 25 60

• Pionier 1139 Isoparaffin C13–C19, Fp. 125°C, Siedebereich 260 bis 300°C

The respective dry mortar mixtures were placed in a mixing vessel. The dedusting additive according to the invention was applied to the dry mortar mixture by means of a pressure sprayer ("flower syringe") in the stated quantitative ratio and mixed with the mortar. Results: Dust number after 0d Dust number after 28d Tile Adhesive 1 (comparative) 150 250 Tile adhesive 1 + 3% white oil (comparison) 5 5 Tile adhesive 1 + 1% BASF GK 1778 (invention) 10 25

• BASF GK 1778: hydrogenated butene tetramer, mp 129 ° C., boiling range> 280 ° C.

Dust number after 0d Dust number after 28d Tile Adhesive 2 (comparative) 150 250 Tile adhesive 2 + 3% white oil (comparison) 5 5 Tile Adhesive 2 + 0.5% Cobersol H190 (Invention) 10 25

• Cobersol H190: alipat. + predominantly cyclic hydrocarbon fraction

Dust number after 0d Dust number after 28d Grout mortar (comparative) 100 150 Grout mortar + 3% white oil (comparison) 10 10 Grout mortar + 1.5% Cobersol C120P (invention) 5 5

• Cobersol C120P: aliphatic. + predominantly cyclic hydrocarbon fraction

Dust number after 0d Dust number after 28d Self-leveling putty (comparative) 100 200. Self-leveling putty +1 white oil 25 30 Self-leveling putty + 1% Cobersol C120P 5 20 Dust number after 0d Dust number after 28d Flexible sealing slurries (comparison) 350 350 Flexible sealing slurry 50 90 1% + Pioneer 1139 (invention) Flexible sealing slurry + 1% Cobersol C120P (invention) 25 60

• Pioneer 1139 isoparaffin C13-C19, mp 125 ° C, boiling range 260-300 ° C

Dedusting of individual components

Measurement Method

The measurements were based on DIN 55999-2 "Determination of a measure of the dust evolution of pigments and fillers - Part 2: Case method" performed.

to Measurement became the "dust measuring device SP3" of the Company LORENZ MESSGERÄTEBAU used.

sample preparation

The respective dispersion powder was placed in a mixing vessel. The dedusting additive according to the invention was applied to the individual component by means of pressure sprayer ("flower syringe") in the stated quantitative ratio and homogeneously mixed. Results Dust number after 0d Dust number after 28d Dispersion powder 1 (comparative) 700 800 Dispersion powder 1 + 3% Cobersol C120P (invention) 100 150 Dispersion powder 2 (comparison) 670 750 Dispersion powder 2 + 3% Cobersol C120P (invention) 90 140

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 4780143 [0004]
• WO 2006/084588 A1 [0006]
• - DE 202006016797 U1 [0007]

Cited non-patent literature

• - ISO 3014 [0011]
• - DIN 51 562 / T1 [0011]
• - DIN 55999-2 [0032]
• - DIN 55999-2 [0035]

Claims (18)

Use of hydrocarbons or hydrocarbon mixtures with a kinematic viscosity at 20 ° C in the range of 0.1 to 25 mm ² / s as additives for reducing the dusting of dry, chemical construction products. Use according to claim 1, characterized in that the hydrocarbons have a kinematic viscosity at 20 ° C in the range of 5.0 to 20 mm ² / s. Use of hydrocarbons or hydrocarbon mixtures with a kinematic viscosity at 40 ° C in the range of 1.0 to 7 mm ² / s as additives for reducing the dusting of dry, chemical construction products. Use according to one of claims 1 to 3, characterized in that it is the hydrocarbons are cyclic hydrocarbons or mixtures thereof. Use according to one of claims 1 to 4, characterized in that the hydrocarbons 3 to 70 and especially 5 to 30 carbon atoms. Use according to one of claims 1 to 5, characterized in that the hydrocarbons or hydrocarbon mixtures a weight-average molecular mass of 100 to 500 g / mol, in particular of 130 to 380 g / mol and more preferably from 150 to 300 g / mol exhibit. Use according to any one of Claims 1 to 6, characterized in that the hydrocarbons are at least one member selected from the group of hydrogenated butene tetramer, iso or n-paraffinic hydrocarbon, aliphatic and cyclic hydrocarbon and in particular C _9-12 koalkane acts. Use according to one of claims 1 or 7, characterized in that the construction chemical products in powder form present and / or have powdery constituents and preferably an average particle size from 0.1 to 5 mm. Use according to one of claims 1 to 8, characterized in that the construction chemical products a Particle size of 2 to 10% ≤ 68 μm and 10 to 30% ≤ 200 microns. Use according to one of claims 1 to 9, characterized in that it is in the construction chemical products is about hydraulically setting or cement-based masses and in particular tile adhesives, joint fillers, fillers, Sealing slurries, repair mortar, leveling mortar, Reinforcement adhesive, adhesive for external thermal insulation systems (ETICS), mineral plasters, fine putty, screed systems, thick-bed mortar, Surface protection systems and pigment preparations. Use according to one of claims 1 to 10, characterized in that it is in the powdery Ingredients to powdered polymers and in particular is redispersible polymer powder or tile adhesive. Use according to one of claims 1 to 11, characterized in that the redispersible polymer powder are composed of at least one representative of the series vinyl acetate, Styrene, butadiene, ethylene, versatic acid vinyl ester, urea-formaldehyde condensation products and melamine-formaldehyde condensation products. Use according to one of claims 1 to 12, characterized in that the hydrocarbons or hydrocarbon mixtures the dry, chemical composition in an amount of 0.1 to 1.5 Wt .-%, preferably from 0.3 to 1.2 wt .-% and particularly preferably be added from 0.5 to 1.0 wt .-%. Use according to one of claims 1 to 13, characterized in that the construction chemical products additionally at least one representative of the series binders, fillers, Aggregates, additives, organic or inorganic fibers, Contain pigments. Use according to one of claims 1 to 14, characterized in that the building chemical Products have a proportion of hydraulic binder in the range of 20 to 80 wt .-%, preferably from 25 to 70 wt .-% and particularly preferably from 30 to 55 wt .-%. Process for producing dry and in particular powdered construction chemical products, with a reduced Staubbildungs- and dust behavior, characterized in that one the building chemicals with at least one hydrocarbon or hydrocarbon mixture according to one of the preceding Claims as dedusting in contact, in particular by spraying. Dry and especially powdery, construction chemical products with a reduced dusting and dusting behavior, producible by the method according to claim 16th Construction chemicals with reduced dustiness and dusting behavior according to claim 17, characterized in that it is in the construction chemical products hydraulically setting and / or cement-based compounds or binders such as dry mortar and in particular tile adhesive, Grouts, fillers, sealing slurries, repair mortars, Leveling mortar, reinforcing adhesive, ETICS adhesive, mineral Plasters, fine putty, screed systems, thick-bed mortar, surface protection systems and pigment preparations.