Hydrophobized fiber cement product comprising at least one profiled surface
AssigneeEtex Services NV
InventorFrank Van den Bergh
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Abstract
A method for improving the hydrophobic properties of a fiber cement product, is provided. The method comprises the steps of providing a fiber cement product comprising at least one profiled surface, applying a water-free silane-based liquid to the at least one profiled surface, and allowing said water-free silane-based liquid to penetrate into the fiber cement product.
Claims12
A method for imparting the hydrophobic properties to a fiber cement plate said method comprising the steps of:
- providing a green fiber cement plate using a Hatschek process;
- curing said green fiber cement plate;
- milling at least one surface of said fiber cement plate after curing of the green fiber cement plate to provide several grooves;
- applying a water-free silane-based liquid comprising at least 50% w of silanes of the formula SiR4, where each of the 4 R-groups is independently an organic group with three of the R-groups selected from ethoxy or methoxy groups and the fourth R-group being a branched or linear hydrocarbon chain, to the at least one profiled surface;
- and
- allowing said water-free silane-based liquid to penetrate the fiber cement plate without leaving visual traces,
- wherein the branched or linear hydrocarbon chain is an octyl, isobutyl or methyl group.
A fiber cement product comprising at least one profiled surface, said fiber cement product comprising a porous fiber cement matrix along said at least one profiled surface, wherein a water-free silane-based hydrophobic agent, originating from a water-free silane-based liquid comprising at least 50% w of silanes of the formula SiR4, where each of the 4 R-groups is independently an organic group with three of the R-groups selected from ethoxy or methoxy groups and the fourth R-group being an octyl, isobutyl or methyl group, is present in the pores of said matrix along said at least one profiled surface, and said profiled surface comprises sunk parts or surfaces, delimited by flanks having an angle between the sunk surface and the flank in the range of 90° to about 180°,
- wherein the profiled surface is free of silane and siloxane residue.
Dependencies are inferred from the claim text.