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Hydrophobic cementitious composition

A composition and compound technology, applied in the field of hydrophobized cement-containing compositions, can solve problems such as inability to suppress, and achieve the effects of preventing primary weathering, reducing or primary weathering, and reducing weathering

Active Publication Date: 2010-06-30
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, efflorescence occurs even during the preparation of cement-bound systems, which cannot be suppressed by subsequent hydrophobization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] Embodiment 1: the preparation of the emulsion that the present invention uses

[0149] With 6.86g gamma-aminopropyltriethoxysilane (( AMEO, Evonik Degussa GmbH) was mixed with 93.14 g of polysiloxane diol (terminal OH groups) with an average molecular weight (weight average) of 4000 (g / mol). This gives a molar ratio of polysiloxanediol:aminoalkylsilane=3:4. To the mixture was added 150 g of octyltriethoxysilane.

[0150] 25 g of an emulsifier mixture comprising ethoxylated triglycerides (HLB value 18) and ethoxylated fatty alcohols (HLB value 11) in a weight ratio of 6:4 were dissolved in 225 g water. ). The silane / siloxane mixture was stirred into this solution and passed through an emulsifier (gap homogenizer) to obtain a stable emulsion.

Embodiment 2

[0151] Embodiment 2: the preparation of the emulsion that the present invention uses

[0152] 100g molecular weight is the polysiloxane diol of 6803 (g / mol) and 32.5g gamma-aminopropyltriethoxysilane (( The mixture of AMEO, Evonik Degussa GmbH) was heated to 180° C. under stirring and nitrogen and kept at this temperature for about 4 hours until 8.8 g of ethanol had been discharged. The resulting product was then cooled to room temperature.

[0153] 125 g of this product were mixed with 125 g of isobutyltrimethoxysilane. 20 g of an emulsifier mixture comprising ethoxylated alkylphenols and methyl-polyoxyethylene (15) cocoamonium chloride (cocoamonium chloride) in a 1:1 weight ratio was added to the formulation, and after adding 355 g After water, the mixture is processed to obtain an emulsion using a device operating on the rotor / stator principle.

Embodiment 3

[0154] Embodiment 3: the preparation of the emulsion that the present invention uses

[0155] 3200g of polysiloxane diol with an average molecular weight of 10666g / mol and 94.4g of 3-glycidyloxy-propyltrimethoxysilane ( GLYMO, Evonik Degussa GmbH) were mixed with each other. The mixture was heated to 170°C with stirring and nitrogen. After about 5 hours, 11.5 g of methanol were discharged. The resulting reaction product was subsequently cooled to room temperature (23° C.).

[0156] 25 g of an emulsifier mixture comprising ethoxylated fatty alcohol and alkylaryl sulfonate in a 3:7 ratio were dissolved in 225 g of water. This solution was mixed with 140 g of the reaction product obtained above and 110 g of n-propyltriethoxysilane. The resulting coarse emulsion was pumped through the interstitial homogenizer three times. Forms a stable emulsion.

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Abstract

The present invention relates to cement-containing compositions which are characterized in that they have a proportion of organosilicon compounds of greater than 0.15% by weight, based on the proportion of cement, the organosilicon compounds being based on at least one organosilicon compound selected from the group consisting of the alkoxysilanes and at least one selected from the group consisting of the alkoxysiloxanes, to a process for the preparation thereof and to the use thereof.

Description

technical field [0001] The present invention relates to novel hydrophobized cementitious compositions and a process for their preparation. Background technique [0002] Cementitious materials and compositions such as adhesives, concrete and building materials, precast concrete elements and concrete products that can be prepared from them, such as pipes, wall sections or paving slabs, are generally used in walls, floors, roofs or used to prepare them. The cementitious materials are often exposed to water, and since these materials are often porous, water can penetrate them. This inherent porosity can be reduced to a great extent by using suitable aggregates or additives and formulations prepared with them. However, complete avoidance of porosity is usually not achievable. Therefore, the industry as a whole is looking for ways to make said materials waterproof and thus waterproof. Two promising approaches have been demonstrated, one internal and one external. Said interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/40C04B111/27C04B103/65
CPCC04B28/02C04B26/02C04B40/0039C04B2111/27C04B2111/542C04B24/42
Inventor B·魏尔斯豪森S·斯塔特米勒M·罗斯F·柯尼希
Owner EVONIK OPERATIONS GMBH
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