EP3129334A1 - Mortier de plâtre sec comprenant un additif d'hydrophobisation - Google Patents

Mortier de plâtre sec comprenant un additif d'hydrophobisation

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Publication number
EP3129334A1
EP3129334A1 EP15741853.4A EP15741853A EP3129334A1 EP 3129334 A1 EP3129334 A1 EP 3129334A1 EP 15741853 A EP15741853 A EP 15741853A EP 3129334 A1 EP3129334 A1 EP 3129334A1
Authority
EP
European Patent Office
Prior art keywords
gypsum
fatty acid
mass
dry mortar
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15741853.4A
Other languages
German (de)
English (en)
Inventor
Daniel Schildbach
Michael Stepp
Christian Gimber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wacker Chemie AG
Original Assignee
Wacker Chemie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wacker Chemie AG filed Critical Wacker Chemie AG
Publication of EP3129334A1 publication Critical patent/EP3129334A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/60—Agents for protection against chemical, physical or biological attack
    • C04B2103/65—Water proofers or repellants

Definitions

  • the invention relates to a gypsum dry mortar with a
  • Hydrophobing i. water-repellent equipment
  • mineral building materials used in particular by mineral building materials.
  • these are inorganic building materials, which may be silicate and non-silicate nature. Due to their good solubility in water, organosiliconates can be applied as an aqueous solution to solids where, after evaporation of the water under the influence of carbon dioxide, they form firmly adhering, permanently water-repellent surfaces. Since they contain virtually no hydrolytically removable organic radicals, the curing takes place advantageously without release
  • VOC undesirable volatile organic by-products
  • Aqueous solutions of Organosiliconaten ' are particularly good for hydrophobing of weakly acidic to weakly alkaline
  • Suitable building materials especially of products made of baked clay, natural stone or gypsum.
  • Hydrophobic agent either by impregnation or
  • Mass hydrophobing done.
  • products of calcined clay or natural stone are immersed in an aqueous dilution of the organosiliconate for a certain time or sprayed with such a dilution, the active substance dissolved in water being capillary in the pore structure of the Building material penetrates.
  • a hydrophobic zone develops that surrounds the building material and drastically reduces its capillary water absorption.
  • Mass hydrophobization becomes the aqueous solution of the
  • aqueous slurry for example, "slurry"
  • slurry aqueous slurry
  • a greatly reduced water absorption of the gypsum building material is compared with the
  • Mass hydrophobization e.g. of gypsum is that the building material is not only surrounded by a hydrophobic zone, but water repellent through and through. This is particularly important in the case of water-soluble building materials such as gypsum or when the building material is cut into pieces after the water-repellent treatment. This method finds e.g. in the
  • Gypsum-based plasters, fillers, screed or self-leveling compounds and adhesives are delivered to the construction site as powder in sacks or silos and only then mixed with the mixing water.
  • gypsum plasters gypsum filler, gypsum plaster, gypsum-based tile adhesives, gypsum-based soil leveling compounds and screed materials and similar mineral building materials is therefore a solid and
  • ready-to-use dry mix can be added and only with the addition of water during the application on site, eg on the construction site, in a short time unfolds its hydrophobic effect. This is called dry-mix application.
  • Standard EN 520 specifies a water absorption, measured for two hours, of less than 5% for the water absorption class Hl of hydrophobic plasterboard approved for use in wet rooms. The skilled person is aware that bound
  • Moisture penetration must also have a water absorption of less than 5%.
  • Dry mortar also the water absorption, measured during 24 hours, is of great importance.
  • DE1957263 describes a method for building gypsum walls in underground operation. A pumpable and thus per se liquid gypsum slurry containing, among other additives
  • DD291074 Also in DD291074 is a Kaliumpropylsiliconat with a
  • Sodium linoleate combined in a Sanierputz, but here the siliconate is added in liquid form. Furthermore, the redevelopment plaster described is based on the binder cement, and not on gypsum.
  • WO2012 / 022544 describes the preparation of pulverulent alkali metal alkyl siliconates having different molar ratios Potassium to silicon and their advantages in the additive of gypsum-bound dry mortars, such as lime gypsum plaster.
  • gypsum-bound dry mortars such as lime gypsum plaster.
  • 0.3% by weight of a potassium methylsilonate powder with a molar ratio of potassium to silicon of 0.64 leaves the water absorption after 2 hours (based on EN 520) in comparison to the untreated reference decrease by over 90%.
  • the lime-plaster machine plaster used here is a so-called low-filled plaster with a proportion of settable gypsum phases of about 60%.
  • Such gypsum plaster contains a low content of fillers (or also called aggregates) due to its relatively high proportion of settable gypsum phases.
  • Such gypsum plaster contains a low content of fillers (or also called aggregates) due to its relatively high proportion of
  • Fillers may include, for example, artificial or natural aggregates as well as minerals of different
  • Grain size distributions e.g. Alkaline earth carbonates (e.g., calcite, dolomite), alkaline earth sulfates (e.g., calcium sulfate in the form of gypsum or anhydrite), chippings, natural sands, or
  • Quartz sand (a more specific description can be found elsewhere in the text). Even if the water absorption after 24 hours underwater storage measures, occurs at a dosage of 0.3 wt .-% of the same potassium methylsilionate a reduction in water absorption compared to the untreated reference of about 80%.
  • Fresh mortar is the slump, which can be determined according to EN 1015-3 with a hammermannel.
  • the air pore content is measured using an appropriate measuring device according to EN 1015-7
  • the invention relates to a gypsum dry mortar
  • organosilicon compound which is selected from Organosiliconatpulver Cl and organosilicon compounds C2, which can be prepared by reacting a molar equivalent of Silane S, which is selected from
  • fatty acid compound selected from fatty acid Dl, fatty acid salt D2 and fatty acid ester D3.
  • hydrophobizing additives can be reduced by over 80% and the 2-hour water absorption in the 2-hour by more than 80% compared to the untreated reference.
  • the proportion of each additive C or D used in the total dosage of the combination of both additives C and D used alone is not effective in the desired form.
  • the two individual additives, used alone in the same dosage as the total dosage of the combination of both additives C and D are also not effective in the desired form. The latter case is a synergy, since the combination of the two additives C and D is more effective than either of the two individual additives, to the same
  • the slump in accordance with EN 1015-3 is not so strongly influenced as if, for example Potassium Methylsiliconatpulver is used in accordance with higher dosage.
  • the gypsum dry mortar is powdery.
  • gypsum As gypsum A all plasters come into question.
  • reactive plasters are preferred: calcium sulfate hemihydrate or hemihydrate (CaSC> 4 * 0.5 H 2 0), in the alpha and in the beta form and in the form of, for example, building plaster, stucco, plaster or gypsum (English stucco or plaster of Paris), and anhydrites (CaSO-4, anhydrite I, II and III), as obtained from known Calciniertechnisch, starting from occurring
  • Gypsum or artificially made gypsum.
  • Multiphase plasters Other types of plaster, such as screed plaster, marble plaster, anhydrite,
  • Hydrofluoric acid or derived from organic carboxylic acids are suitable.
  • silicas silicas, silicates, sulfates, nitrides, carbides, ashes, expanded mineral lightweight fillers and clays.
  • Extremely suitable alkaline earth carbonates such. Calcium carbonates, calcium magnesium carbonates, chalk, calcite and dolomite, alkaline earth sulfates, e.g. barium sulfate,
  • Strontium sulfate, barite, Blanc Fixe and calcium sulfate are preferred in the form of its phases or modifications of gypsum, bassanite or anhydrite, silicas such.
  • Quartz and quartz flours such as diatomaceous earth, celite, Clays, zeolites, calcium silicate, zirconium silicate, cristobalite, talc, bentonite, kaolin, china clay, mica, muscovite,
  • Silicas such as e.g. Precipitated silica, pyrogenic
  • Silicas or diatomaceous earth Silicas or diatomaceous earth, metal oxides such as e.g. Aluminum, titanium, iron or zinc oxides and their mixed oxides,
  • Microfiller, perlite, vermiculite, expanded glass, and expanded clay can be different
  • the mineral filler B may also be in the form of mineral fibers, such as glass fibers, glass and
  • the grain size of the mineral filler B is preferably between 1 and 3000 micrometers, more preferably between 5 and 2500
  • Micrometer and most preferably between 10 and 2000 microns.
  • the gypsum dry mortar contains 100 gypsum plaster
  • Parts by mass of mineral filler more preferably preferably at least 30 parts by mass and at most 700
  • Parts by mass of mineral filler most preferably at least 35 parts by mass and not more than 500
  • Parts by mass of mineral filler in particular at least 40 parts by mass and at most 300 parts by mass of mineral
  • the Organosiliconatpulver Cl used according to the invention can carry as a cation alkali or alkaline earth metals or their mixtures with each other. Particularly preferred are the sodium and potassium organosiliconates.
  • the organosiliconate powder Cl used can be the solid salts of organosilanols described in O2012 / 159874. There is also described a process for the preparation of Organosiliconatpulver Cl.
  • the organosiliconate powders Cl are preferably solid salts of organosilanols, of their hydrolysis / condensation products, or of organosilanols together with theirs
  • Alkali cation hydrolysis / condensation products in which the molar ratio of cation to silicon is 0.5 to 3.
  • the organo-group is preferably a monovalent one
  • Alkylaryl radicals arylalkyl radicals and phenyl radicals.
  • the hydrocarbon radicals preferably have 1 to 6 carbon atoms, more preferably the 3, 3, 3-trifluoropropyl, the vinyl and the phenyl radical, very particularly preferably alkyl radicals, such as the ethyl, propyl, butyl, pentyl, Hexyl, heptyl, the octyl and the hexadecyl and their possible
  • organo radical examples are:
  • organo radicals are radicals - (CH 2 O) n R 1 ,
  • n, m and o are from 1 to 10, in particular 1, 2, 3 and RL, alkyl radicals having 1 to 6 carbon atoms, especially those above
  • Alkali metal to silicon can be achieved. Preferred is a ratio between 0.1 and 3.0, more preferred is a
  • Ratio between 0.3 and 2.0, exceptionally preferred is a ratio between 0.5 and 1.5.
  • organosilicon compounds C2 used according to the invention may be those described in WO2013 / 053609
  • Organosilicon compounds be 0. There is also described a process for the preparation of the organosilicon compounds C2.
  • the hydrocarbon radicals of the silane S are optionally substituted Ci-C] _5 hydrocarbon radicals.
  • Examples of the Ci-C ⁇ hydrocarbon radicals are
  • Alkyl radicals such as the methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert. Butyl, n-pentyl, iso-pentyl, neo Pentyl, tert.
  • -Pentyl radical Hexyl radicals, such as the n-hexyl radical; Heptyl radicals, such as the n-heptyl radical; Octyl radicals, such as the n-octyl radical and iso-octyl radicals, such as the 2, 2, 4-trimethylpentyl radical; Nonyl radicals, such as the n-nonyl radical; Decyl radicals, such as the n-decyl radical; Dodecyl radicals, such as the n-dodecyl radical; Alkenyl radicals, such as the vinyl and allyl radicals; Cycloalkyl radicals, such as
  • Cyclopentyl, cyclohexyl, cycloheptyl and methylcyclohexyl radicals are cyclohexyl radicals;
  • Anthryl and phenanthryl radical Alkaryl radicals, such as o-, m-, p-tolyl radicals; Xylyl radicals and ethylphenyl radicals; Aralkyl radicals, such as the benzyl radical, the alpha- and the 3-phenylethyl radical,
  • substituted C ] _-C] _5 hydrocarbon radicals are substituted by fluorine, chlorine, bromine and iodine atoms
  • Alkyl radicals such as the 3, 3, 3-trifluoro-n-propyl radical, the
  • Hydrocarboxylic oxy-silane acts with amino functions
  • substituted alkyl radicals such as the 3-aminopropyl radical, the N-phenyl-aminomethyl radical, the 2-3- (2-aminoethyl) aminopropyl radical, the N-morpholinomethyl radical, the N-octylaminomethyl radical, thiol-substituted alkyl radicals such as
  • Thiopropyl, epoxy-substituted alkyl radicals such as Glycidoxypropylrest, Ethylcyclohexenoxidrest.
  • the unsubstituted -C ⁇ Q alkyl radicals especially the methyl radical and ethyl radical.
  • the hydrocarbonoxy radicals of the silane S are preferably C 1 -C 4 -hydrocarbonoxy radicals.
  • Oxygen atom are bonded to the silicon atom.
  • the non-substituted C 1 -C 3 -alkyl radicals in particular the methyl radical and the ethyl radical.
  • the halo radicals of the silane S are chlorine radicals.
  • the silane S may contain even small amounts, preferably at most 5 mol%, in particular at most 2 mol%, of silanes which are selected from dihydrocarbyl dihalosilane,
  • Trihydrocarbylhalosilane Trihydrocarbylhalosilane, tetrahalosilane,
  • the silane S may also contain small amounts, preferably at most 5 mol%, in particular at most 2 mol% of siloxanes, which are formed by hydrolysis from the silane S.
  • the silane S may also contain minor proportions, preferably at most 5 mol%, in particular at most 2 mol%, of disilanes, e.g. from distillation residues of
  • the silane S may contain small amounts, preferably not more than 10 mol%, in particular not more than 5 mol% of Si-bonded hydrogen.
  • the polyhydroxy compound P is preferably a linear or branched monomeric or oligomeric C2-C5-
  • Glycol, and mixed glycols in particular C2-C glycol having a total of at most 40 carbon atoms, preferably
  • the glycols are ethylene glycol or its oligomers, propylene glycol or its oligomers, and mixed glycols with propylene glycol and ethylene glycol units.
  • the oligomers have at most 6, in particular at most 3 monomer units.
  • Ethylene glycol units and 1-5 propylene glycol units and mixtures thereof and bis (hydroxymethyl) urea Ethylene glycol units and 1-5 propylene glycol units and mixtures thereof and bis (hydroxymethyl) urea.
  • propylene glycol and ethylene glycol are particularly preferred.
  • tri-, tetra-, penta- and hexahydroxy compounds having 3 to 12 carbon atoms particularly preferred are linear or branched tri-, tetra-, penta- and
  • Hexahydroxy compounds having 3 to 12 carbon atoms having 3 to 12 carbon atoms.
  • Examples are glycerol, 1, 2, 4-butanetriol, 1,1,1-tris (hydroxymethyl) ethane, pentaerythritol, meso-erythritol, D-mannitol, saccharides such as D- (+) -mannose, D- (+) - Glucose, D-fructose. Furthermore, their condensation products, di- and polysaccharides such as D- (+) - sucrose, cyclodextrins, cellulose and starch and their derivatives, e.g. their methyl, ethyl and hydroxyethyl derivatives or partially or fully saponified polyvinyl acetates are used.
  • C2-C12-hydroxycarboxylic acids preferably C2 ⁇ Cg-
  • Hydroxycarboxylic acids particularly preferred are aromatic and linear or branched hydroxyalkylcarboxylic acids, such as Salicylic acid, mandelic acid, 4-hydroxybenzoic acid, 2,4-dihydroxybenzoic acid, 3, 5-dihydroxybenzoic acid, glycolic acid, lactic acid, 2,2-bis (hydroxymethyl) propionic acid, tartaric acid, citric acid, 3-hydroxybutyric acid, 2-hydroxyisobutyric acid, particularly preferred are linear or branched
  • Hydroxyalkylcarbon yarnren in particular lactic acid.
  • At least 0.5 molar equivalents particularly preferably at least 0.7, in particular at least 0.9 and preferably at most 1.3, more preferably at most 1.2, in particular at most 1.1 hydroxyl groups, derived from the polyhydroxy compound P, per molar equivalent of halogen or
  • Hydrocarbonoxy used in silane S Preference is given to using silanes S having a hydrocarbonoxy radical, particularly preferably alkyltrialkoxysilanes. Examples are methyltrimethoxysilane, ethyltrimethoxysilane, n-propyltrimethoxysilane, isopropyltrimethoxysilane, n-butyltrimethoxysilane, 2-methyl-1-propyltrimethoxysilane, 2-butyltrimethoxysilane, cyclohexyltrimethoxysilane, 2-cyclohexyl-1-ethyltrimethoxysilane, n-hexyltrimethoxysilane,
  • Particularly preferred polyhydroxy compounds P are lactic acid, propylene glycol and glycerol.
  • the gypsum dry mortar contains 100 gypsum plaster
  • Organosilicon compound C Parts by mass of organosilicon compound C, more preferably at least 0.05 part by mass and at most 3 parts by mass Organosilicon compound C, in particular at least 0.1
  • fatty acid D1 lower (up to seven carbon atoms), middle (eight to twelve carbon atoms) and higher (more than twelve carbon atoms) fatty acids may be used, with lower fatty acids being more preferred, medium fatty acids being more preferred, and higher fatty acids being highly preferred.
  • main and subgroup metals may be used as cations for the fatty acid anion described above. Preference is given to alkali metals,
  • Alkaline earth metals and metals of group 12 of the Periodic Table of the Elements are particularly preferred. Most preferably, the metals are sodium, potassium, magnesium, calcium, barium, zinc and aluminum.
  • particularly preferred and exceptionally preferred fatty acid salts are calcium stearate, calcium 12-hydroxystearate, calcium laurate, calcium behenate, barium stearate, barium laurate, zinc stearate, zinc behenate, zinc laurate, zinc oleate,
  • fatty acid anion ammonium and alkylammonium, e.g.
  • the fatty acid esters D3 are preferably solid to pasty at room temperature.
  • alkyl esters of fatty acids of the general formula RCOOR ' where R is a linear or branched, saturated or unsaturated, unsubstituted or substituted hydrocarbon radical having 4 to 22, preferably 6 to 16, carbon atoms, and R * is a linear or branched, saturated or unsaturated unsubstituted or substituted hydrocarbon radical having 1 to 50, preferably 2 to 30, especially preferably 3 to 16 carbon atoms represented by one or more
  • Oxygen atoms may be interrupted, wherein in each case at least one carbon atom is located between two adjacent oxygen atoms. Also mono-, di and
  • Triglycerides of saturated fatty acids such as hydrogenated fats (e.g., hardened soybean oil, hydrogenated sunflower oil, hardened peanut oil, hydrogenated rapeseed oil).
  • the gypsum dry mortar contains 100 gypsum plaster
  • Fatty acid compound D in particular at least 0.1 parts by mass and at most 1 part by mass of fatty acid compound D.
  • Organosilicon compound C and fatty acid compound D are in the sum of both additives, preferably in dosages between 0.02 and 6.0 parts by mass intimately with a
  • Gypsum dry mortar formulation containing gypsum A and mineral filler B, especially in the dry state
  • dosages between 0.1 and 4.0 parts by mass, exceptionally preferred dosages between 0.2 and 2 parts by mass.
  • Components organosilicon compound C and fatty acid compound D is freely selectable in the gypsum dry mortar and to determine by appropriate experiments, preferably is a Weight ratio between 0.25 and 4, more preferably a weight ratio between 0.33 and 3, and most preferably a weight ratio between 0.5 and 2.
  • the fatty acid salt D2 is then selected from the fatty acid D1 and that in the organosiliconate powder Cl (based, for example, on NaOH or KOH) or in the
  • Building material formulation (formed by the proportion of, for example, CaO or Ca (OH) 2) contained alkalinity.
  • solid fatty acids D1 are lauric acid, palmitic acid and stearic acid
  • cements preferably Portland white and Portlandgrauzement
  • alkali and alkaline earth oxides and hydroxides preferably calcium oxides, calcium, magnesium, magnesium
  • the plaster dry mortar may contain pigments such as synthetic or natural pigments to produce a desired hue.
  • pigments such as synthetic or natural pigments to produce a desired hue.
  • they are oxide and
  • the white pigments are titanium dioxide in the anatase and rutile form, zinc sulfide and zinc (oxide) white, the
  • Cobalt green, cobalt blue, ultramarine blue and iron blue are preferably between 0.01 and 100 micrometers, more preferably between 0.1 and 10
  • the gypsum dry mortar may contain further components, such as polymer powders, polymeric organic binders,
  • gypsum dry mortar may also include organic fillers, organic pigments, soluble inorganic and organic dyes, organic fibers (e.g., cellulosic, polyalkylene, polyvinyl alcohol, polyvinyl acetate fibers),
  • the gypsum dry mortar for example, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster, a plaster
  • Self-leveling compound a model or hobby plaster, a
  • Impression material an adhesive or a combination.
  • Formulas is the silicon atom tetravalent. All data refer to a pressure of 0,10 MPa (abs.)
  • MGP 1 used in powder form MGP 1 is a low-filled lime-gypsum machine plaster with a proportion of settable gypsum phases of about 60% and a consequent proportion of about 40% fillers), MGP 2 is a highly filled lime -Gypsum -machine plaster with a share in
  • Fatty acid salts in dry form are effectively mixed in a so-called planetary mixer as described in EN 196-1 for 30 seconds. Subsequently, this dry mixture was added in portions to the mixing water in accordance with the recipe indicated on the packing with stirring and mixed with the planetary mixer as described in EN 196-1 to form a homogeneous slurry (MGP 1: 300 g of powder and 180 g of water, MGP 2: 300 g powder and 105 g water according to the instructions). Subsequently, the resulting slurry was poured into PVC rings (diameter: 80 mm, height 20 mm) and the setting of gypsum plaster at 23 ° C and 50% relative humidity was waited for 6 hours. After
  • test specimens were stored in a plastic trough under water after determining the dry weight for 120 min
  • test specimens were placed horizontally on metal mesh and the Water supernatant above the highest point of the test specimen was 5 mm. After 120 minutes, the test specimens were removed from the water, drained on a water-saturated sponge, and on a balance with an accuracy of 0.01 g from the wet weight and the dry weight the percentage
  • Percent water absorption ⁇ [mass (wet) - mass (dry)] / mass (dry) ⁇ ⁇ 100% calculated. After weighing, which took only a few seconds per test specimen, the test specimens were immediately returned to the plastic tray under water. After a few seconds per test specimen, the test specimens were immediately returned to the plastic tray under water. After a few seconds per test specimen, the test specimens were immediately returned to the plastic tray under water. After a few seconds per test specimen, the test specimens were immediately returned to the plastic tray under water. After a
  • Potassium Methylsiliconatpulver (molar ratio of alkali metal to silicon: 0.65) and various fatty acid salts or
  • Table 1 shows, in the case of Application Examples 1 and 2, that the potassium methylsiliconate powder contains the 2-h water uptake and the 24-hr water uptake of a low-filled water
  • Machine plaster gypsum (MGP 1) at a dosage of 0.22 wt .-% greatly reduced.
  • Application Example 5 still 0.11 wt .-% sodium oleate used separately (Application Example 7) or 0.26 wt .-% potassium methylsiliconate powder used separately (Example of Application 6) or 0.26 wt .-% sodium oleate used separately (Example of application 8) lower both the 2-hr and 24-hr water pick-ups to less than 10 weight percent. This is a synergistic effect.
  • Application Examples 10-21 show that the effect is similarly observed with the fatty acid salts potassium oleate, calcium stearate, zinc laurate and calcium laurate. For example, lower values are always measured for 2 h and 24 h water when potassium methylsiliconate powder and fatty acid salt are combined than when the two components are used individually in the same amount.
  • Application examples 22-27 show that the same effect can be achieved / if, instead of the fatty acid salt, a powdery fatty acid solid at room temperature is used. Again, even low dosages of lauric acid or stearic acid in combination with a low dosage of potassium methylsiliconate powder used alone the highly-filled machine plaster MGP 2 not effective
  • Table 1 Water absorption of gypsum plaster test specimens in accordance with DIN EN 520
  • Table 1 Water absorption of gypsum plaster test specimens in accordance with DIN EN 520 (continued)

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un mortier de plâtre sec contenant A) 100 parties en poids de plâtre, B) au moins 20 parties en poids d'une charge minérale, C) un composé organosilicié solide à 20°C, choisi parmi les poudres d'organosilicate C1 et les composés organosiliciés C2, pouvant être obtenus par réaction d'un équivalent molaire de silane S, choisi parmi le trihalogénosilane hydrocarboné, le trihydrocarbonoxysilane hydrocarboné ou des mélanges de ceux-ci ou leurs hydrolysats partiels avec des composés polyhydroxy P en un rapport molaire permettant d'avoir, par équivalent molaire de radical halogène ou hydrocarbonoxy, 0,3 à 1,3 équivalent molaire de radicaux hydroxy, D) un composé d'acide gras, choisi parmi les acides gras D1, les sels d'acides gras D2 et les esters d'acides gras D3.
EP15741853.4A 2014-04-08 2015-03-27 Mortier de plâtre sec comprenant un additif d'hydrophobisation Withdrawn EP3129334A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014206785.5A DE102014206785A1 (de) 2014-04-08 2014-04-08 Gipstrockenmörtel mit Hydrophobierungsadditiv
PCT/EP2015/056742 WO2015155034A1 (fr) 2014-04-08 2015-03-27 Mortier de plâtre sec comprenant un additif d'hydrophobisation

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EP3129334A1 true EP3129334A1 (fr) 2017-02-15

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DE (1) DE102014206785A1 (fr)
WO (1) WO2015155034A1 (fr)

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DE102015203685A1 (de) * 2015-03-02 2016-09-08 Wacker Chemie Ag Verfahren zur Herstellung pulverförmiger Alkaliorganosiliconat- Baustoffhydrophobiermittel
EP3640224B1 (fr) * 2015-10-29 2022-11-30 STO SE & Co. KGaA Composition de liant a efflorescence reduite a faible emission de co2
JP6260838B2 (ja) 2016-02-29 2018-01-17 株式会社ケーヒン 空調用ブロアモータユニット
JP2024504233A (ja) * 2020-11-24 2024-01-31 クナウフ ギプス カーゲー 相乗的に有効な疎水化剤の組み合わせを含む無機結合剤に基づく建設材料

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