Process for casting and waterproofing of elements cast in concrete, mortar, cement, by using a silicone resin
AssigneeRhodia Chimie
InventorsEric Garcin, Sandrine Goubet
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Abstract
The process for simultaneously molding and rendering water-repellent molded components made of concrete, mortar, cement or the like consists, before pouring the concrete, cement or the like, in covering the interior of the mold with a composition comprising a resin which is a silicone copolymer in the absence of crosslinking agent of hydrolysable silane type and of curing catalyst in the composition. Molded component thus obtained and compositions for removing from the mold and rendering water-repellent.
Claims21
A process for simultaneously moulding in a mould having an interior and rendering water-repellent moulded components made of concrete, mortar, or cement comprising the steps of:
- covering the interior of the mould before pouring the concrete, mortar, or cement, with a composition comprising a resin which is a silicone copolymer of following formula (I):
- MαDβTγQδ(OR)ε (I)
- wherein
- M=R1R2R3SiO½
- D=R4R5SiO2/2
- T=R6SiO3/2
- Q=SiO4/2
- R1, R2, R3, R4, R5 and R6, which are identical to or different from one another, each represent a C1-C12 hydrocarbon-comprising residue;
- R is a hydrogen atom or a linear or branched C1-C4 alkyl radical;
- the α, β, γ and δ symbols represent the molar fractions (or the proportion by number) of the silicon atoms respectively of M, D, T and Q types for one silicon atom;
- the ε symbol represents the molar fraction (or the proportion by number) of the (−)3SiOR ends per silicon atom;
- these symbols varying within the following ranges:
- α:
- 0-0.5
- β:
- 0-0.95
- γ:
- 0-0.9
- δ:
- 0-0.8
- ε:
- 0.05-2
- with the proviso that α+β+γ+δ=1, and that the copolymer exhibits, in its structure, at least one T or Q unit;
- and
- in the absence of crosslinking agent of hydrolysable silane and of curing catalyst in the composition.
A moulding and water-repellent composition, comprising at least one resin which is a silicone copolymer of formula (I):
- MαTβTγQδ(OR)ε (I)
- wherein:
- M=R1R2R3SiO½
- D=R4R5SiO2/2
- T=R6SiO3/2
- Q=SiO4/2;
- R1, R2, R3, R4, R5 and R6, which are identical to or different from one another, each represent a C1-C12 hydrocarbon-comprising residue;
- R is a hydrogen atom or a linear or branched C1-C4 alkyl radical;
- the α, β, γ and δ symbols represent the molar fractions (or the proportion by number) of the silicon atoms respectively of M, D, T and Q types for one silicon atom;
- the ε symbol represents the molar fraction (or the proportion by number) of the (−)3 SiOR ends per silicon atom;
- these symbols varying within the following ranges:
- α:
- 0-0.5
- β:
- 0-0.95
- γ:
- 0-0.9
- δ:
- 0-0.8
- ε:
- 0.05-2
- with the proviso that α+β+γ+δ=1, and that the copolymer exhibits, in its structure, at least one T or Q unit;
- and
- at least one surface-tension modifier selected from the group consisting of an unreactive oil, a reactive oil, a copolymer, and a mould-release agent in the absence of crosslinking agent of hydrolysable silane and of curing catalyst in the composition.
Dependencies are inferred from the claim text.