摘要:
Dark discoloured specks on facing concrete surfaces can be avoided by the addition to the facing concrete prior to its curing, at least in its region that forms the facing concrete surface after curing, of a discoloration attenuator comprising cations of alkali metals and inorganic and/or organic anions, and/or by the use, for producing at least that region of the facing concrete that forms the facing concrete surface after curing, of a cement having an Na 2 O equivalent of at least 0.7% by mass, this being achieved through addition of soluble alkalis.
摘要:
Verfahren zur Herstellung von Fugenmörtel, dadurch gekennzeichnet, dass Copolymerisate von ethylenisch ungesättigten Monomeren und von ethylenisch funktionalisierten Nanopartikeln in Form deren wässrigen Polymerdispersionen oder in Wasser redispergierbaren Polymerpulver, erhältlich mittels radikalisch initiierter Polymerisation in wässrigem Medium, und gegebenenfalls anschließender Trocknung der dabei erhaltenen Polymerdispersion, von A) einem oder mehreren Monomeren aus der Gruppe umfassend Vinylester, (Meth)acrylsäureester, Vinylaromaten, Olefine, 1,3-Diene, Vinylether und Vinylhalogenide und gegebenenfalls weiteren damit copolymerisierbaren Monomeren, in Gegenwart von B) mindestens einem Partikel P mit einem mittleren Durchmesser von ≤ 1000 nm, welches mit ethylenisch ungesättigten, radikalisch polymerisierbaren Gruppen funktionalisiert ist, wobei B1) als Partikel P ein oder mehrere aus der Gruppe der Metalloxide und Halbmetalloxide eingesetzt werden, und/oder B2) als Partikel P Siliconharze eingesetzt werden, welche aus Wiederholungseinheiten der allgemeinen Formel [R 4 (p+z) SiO (4-p-z)/2 ] (II) aufgebaut sind, wobei R 4 gleich oder verschieden ist, und Wasserstoff-, Hydroxy-, sowie Alkyl-, Cycloalkyl-, Aryl-, Alkoxy- oder Aryloxyreste bedeutet, mit jeweils bis zu 18 C-Atomen, welche gegebenenfalls substituiert sein können, wobei für mindestens 20 Mol-% des jeweiligen Siliconharzes p + z = 0, 1 oder 3 beträgt, und wobei B1) und B2) jeweils mit einem oder mehreren α-Organosilanen der allgemeinen Formel (R 1 O) 3-n (R 2 ) n Si-(CR 3 2 )-X (I) funktionalisiert werden, wobei R 1 für Wasserstoff, einen Alkylrest mit 1 bis 6 Kohlenstoffatomen oder einen Arylrest steht, R 2 und R 3 jeweils unabhängig voneinander für Wasserstoff, einen Alkylrest mit 1 bis 12 Kohlenstoffatomen oder einen Arylrest stehen, n die Werte 0, 1 oder 2 bedeuten kann, und X ein Rest mit 2 bis 20 Kohlenwasserstoffatomen mit einer ethylenisch ungesättigten Gruppe ist, verwendet werden.
摘要:
A premixed composition is formed from modified polyacrylate polymer, silicone emulsion, and silane, that cures rapidly to form a composition that can be used as a grout or coating. The premixed composition includes a latex resin including an acrylic-based polymer, a silicone emulsion, and a silane, and optionally may include various fillers, pigments, and adjuvants. These components in the proper proportions form a stable viscous suspension that can be floated into tile joints, and cleaned from an adjacent tile surface. The composition rapidly cures to form a hard mass that is resistant to abrasion, in both dry and wet conditions, is color consistent, and is resistant to staining.
摘要:
A cement additive composition for concrete surface discoloration prevention which comprises a combination of a cement additive (a) and a water reducing agent (b) in an (a)/(b) ratio of (5-99.5)/(95-0.5) by weight and in which the additive (a) comprises a mixture of compounds represented by the following general formula (1): R1O(AO)n1H which comprise compounds wherein n1 is each of the integers of from 2 to 6 in a total amount of 40 wt.% or more based on the additive (a), the average of n1 is 1.5 to 10, and the additive (a) has a molecular weight distribution, Mw/Mn, of 1.05 or higher and a Z-average molecular weight, Mz, of 200 or higher. It is effective in preventing the surface of a concrete from discoloring. (In the formula, R1 is C1-6 alkyl; A is ethylene and/or propylene; and n1 is a number of 1 or larger.)
摘要:
A cement additive composition for preventing discoloration of the surface of concrete, comprising a cement additive (a) and a water-reducing admixture (b), the additive (a) comprising a mixture of compounds represented by the general formula (1): R 1 O(AO)n 1 H ··· (1) (wherein R 1 is a C 1-6 alkyl group, A is an ethylene group and/or a propylene group, and n 1 is a number of 1 or more), containing all the compounds satisfying n 1 = 2 to 6 in a total amount of not less than 40 % by mass, and having an average n 1 of 1.5 to 10, a molecular weight distribution Mw/Mn of not less than 1.05, a Z average molecular weight Mz of not less than 200 and a ratio of (a):(b) by mass of (5 to 99.5) : (95 to 0.5). It can prevent the discoloration of the surface of concrete.
摘要:
The present invention relates to construction material mixtures containing furnace slag and zinc salts comprising from 0 to 8 carbon atoms in the structure thereof. The invention further relates to the use of zinc salts for preventing discolorations during the curing of construction material mixtures.
摘要:
The present invention relates to construction material mixtures containing furnace slag and zinc salts comprising from 0 to 8 carbon atoms in the structure thereof. The invention further relates to the use of zinc salts for preventing discolorations during the curing of construction material mixtures.
摘要:
The invention relates to a single-layer coating for a facade that comprises at least one silane having at least one alkoxy function. The invention also relates to the production of this coating, and to the use thereof for improving its hydrophobia and limiting alterations on facades such as colour differentiations (carbonation, bleaching, cracking, differentiated drying), soils of biological, mineral or organic origins, and/or the proliferation of plant formations.