Use and method for reduction of corrosion
AssigneeSika Technology AG
InventorsUrs Mader, Franz Wombacher, Beat Marazzani
Life of this patent
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Abstract
The invention relates to a use of a composition containing polyorganosiloxane S and a method of reducing corrosion on steel reinforcement in reinforced concrete constructions, and also a concrete structure which is produced using such compositions. It is highly suitable for the renovation of old concrete but also for inhibition of corrosion of reinforcing iron in fresh concrete.
Claims20
A method for reducing corrosion on steel reinforcement of steel-reinforced concrete constructions comprising applying a composition to a steel-reinforced concrete surface or steel-reinforcement, or adding the composition to fresh concrete, wherein the composition comprises at least one polyorganosiloxane S having at least 4 repeating units of the general formula (I)
- [A1z(B1O)pSiO(4-p-z)/2] (I)
- where B1 is either H, an alkyl or aryl radical having up to 18 carbon atoms or a radical of the general formula (II)
- where X1 and X2 are each, independently of one another, O, S or NR4;
- A1, R2, R3 and R4 are each, independently of one another, hydrogen or a hydrocarbon radical which contains up to 18 carbon atoms and may additionally contain heteroatoms selected from the group consisting of O, S, Si, Cl, F, Br, P and N;
- R5, R5′ and R6 are each, independently of one another, an unbranched or branched alkylene radical having from 1 to 8 carbon atoms;
- z and p are each, independently of one another, 0, 1, 2 or 3;
- m is 0 or an integer from 1 to 10;
- q is 0 or an integer from 1 to 10;
- with the proviso that
- at least one radical of the general formula (II) and at least one alkoxy or aryloxy radical having up to 18 carbon atoms and at least one repeating unit of the general formula (I) in which the silicon atom is bound to three oxygen atoms are present in the polyorganosiloxane S, wherein at least 70 mol % of the radicals B1 in the polyorganosiloxane S are radicals of the general formula (II).
A method of avoiding corrosion on steel reinforcement of steel-reinforced concrete constructions, wherein a composition is applied to a steel-reinforced concrete surface wherein the composition comprises at least one polyorganosiloxane S having at least 4 repeating units of the general formula (I)
- [A1z(B1O)pSiO(4-p-z)/2] (I)
- where B1 is either H, an alkyl or aryl radical having up to 18 carbon atoms or a radical of the general formula (II)
- where X1 and X2 are each, independently of one another, O, S or NR4;
- A1 , R2, R3 and R4 are each, independently of one another, hydrogen or a hydrocarbon radical which contains up to 18 carbon atoms and may additionally contain heteroatoms selected from the group consisting of O, S, Si, Cl, F, Br, P and N;
- R5, R5′ and R6 are each, independently of one another, an unbranched or branched alkylene radical having from 1 to 8 carbon atoms;
- z and p are each, independently of one another, 0, 1, 2 or 3;
- m is 0 or an integer from 1 to 10;
- q is 0 or an integer from 1 to 10;
- with the proviso that
- at least one radical of the general formula (II) and
- at least one alkoxy or aryloxy radical having up to 18 carbon atoms and at least one repeating unit of the general formula (I) in which the silicon atom is bound to three oxygen atoms are present in the polyorganosiloxane S, wherein at least 70 mol % of the radicals B1 in the polyorganosiloxane S are radicals of the general formula (II).
Dependencies are inferred from the claim text.