Abstract:
The invention relates to a method for treatment of cellulose-based material comprising a coupling step and a hydrophobization step. The coupling step comprises the provision of a coupling solution comprising titanium (IV) isopropoxide (TTIP) or a basic solution of zinc oxide and the immersion of the cellulose-based material into the coupling solution. The following hydrophobization step comprises the provision of a hydrophobization solution comprising a hydrophobic compound and the immersion of the cellulose-based material in the hydrophobization solution, yielding a hydrophobic cellulose-based material, followed by drying of the hydrophobic cellulose-based material. According to a second aspect of the invention a cellulose-based material is provided characterized by its omniphobic properties, a cellulose-TTIP hybrid layer and/or Zn O hybrid layer.
Abstract:
A composite material is characterised by a substrate and by a nanocomposite in functional contact therewith obtained by surface modification of (a) colloidal inorganic particles with (b) one or several silanes of the general formula (I): Rx-Si-A4-x, in which the radicals A are the same or different and represent hydroxyl groups or hydrolytically splittable groups, except for methoxy, the radicals R are the same or different and represent non hydrolytically splittable groups and x equals 0, 1, 2 or 3, x>/=1 in at least 50 % by volume of the silanes, in the conditions of a sol-gel process with a substoichiometric amount of water, in relation to the available hydrolysable groups, so as to form a nanocomposite sol. If required, the nanocomposite sol is further hydrolysed and condensed before being brought into contact with the substrate and then hardened. The substrate is not a glass or mineral fibre, nor a vegetable material. 00000
Abstract:
L'invention concerne un procédé de revêtement d'un matériau textile, ledit procédé comprenant les étapes suivantes : d) fournir une composition de revêtement comprenant un solvant aqueux et un précurseur organosilicé, e) imprégner le matériau textile par foulardage avec la composition de revêtement, f) sécher le matériau textile imprégné, caractérisé en ce que la composition de revêtement est exempte d'acide polycarboxylique et de catalyseur.
Abstract:
A foundry binder is obtained by surface modification of (a) colloidal inorganic particles with (b) one or several silanes of the general formula (I): Rx-Si-A4-x, in which the radicals A are the same or different and represent hydroxyl groups or hydrolytically splittable groups, except for methoxy, the radicals R are the same or different and represent non hydrolytically splittable groups and x equals 0, 1, 2 or 3, x>/=1 in at least 50 % by volume of the silanes, in the conditions of a sol-gel process with a substoichiometric amount of water, in relation to the available hydrolysable groups, so as to form a nanocomposite sol. If required, the nanocomposite sol is further hydrolysed and condensed before being brought into contact with the foundry sand. 00000
Abstract:
A composite material is characterised by a substrate based on vegetable materials, in particular vegetable fibres, vegetable fibre raw materials or vegetable fibre semifinished products, and by a nanocomposite in functional contact therewith obtained by surface modification of (a) colloidal inorganic particles with (b) one or several silanes of the general formula (I): Rx-Si-A4-x, in which the radicals A are the same or different and represent hydroxyl groups or hydrolytically splittable groups, except for methoxy, the radicals R are the same or different and represent non hydrolytically splittable groups and x equals 0, 1, 2 or 3, x>/=1 in at least 50 % by volume of the silanes, in the conditions of a sol-gel process with a substoichiometric amount of water, in relation to the available hydrolysable groups, so as to form a nanocomposite sol. If required, the nanocomposite sol is further hydrolysed and condensed before being brought into contact with the substrate and then hardened.