摘要:
The invention relates to a nano composite for thermal insulation especially for fireproofing purposes, which can be obtained by combining (A) at lest 35 wt. % of nanoscaled, optionally surface modified particles of an inorganic compound; (B) 10-60 wt. % of a copound with at least two functional groups which can react and/or interact with surface groups of nanoscaled particles (A), (C) 1-40 wt. % of water and/or an organic solvent, which has no functional groups or only one which is defined in (B), wherein the above-mentioned percentages relate to the sum of constituents (A) (B) and (C) and (D) = 0-10 wt. % (in relation to the nano composite) of additives.
摘要:
The invention relates to a solid, meltable and thermohardening mass, comprising condensates (K) derived from at least one hydrolyzable silane and possibly one or more hydrolyzable metal compounds. Groups (A) positioned on the central atoms (M) of the condensates (K) permit the further condensation of the condensates. At least 70 % of the central atoms (M) present one or more non-hydrolyzable organic groups (R) linked to same, a part of which can be substituted by complex-forming species coordinated with the central atoms (M). At temperatures of between 50 and 200 °C the condensates (K) have a minimum viscosity of between 10 mPa.s and 150 Pa.s. The above mass is suitable, for example, for a powder coating for coating metal, plastic, glass and ceramic substrates.
摘要:
The invention relates to a method for producing a composition for preparing nanostructured forms and layers, consisting of bringing an aqueous and/or alcoholic sol of a compound of an element selected from silicon and the main and sub-group metals into contact with species which have hydrolyzable alkoxy groups and which include at least one organically modified alkoxysilane or a precondensate derived therefrom, in conditions which lead to the (further) hydrolysis of the species and then removing any alcohol which has formed or which may optionally have been present originally. The invention is characterized in that enough alcohol is removed to leave a residual amount of not more than 20 wt.% in the composition.
摘要:
Disclosed is a method for providing a metal surface with a vitreous layer which is decorative, scratch-resistant and inhibits corrosion. The inventive method is characterized in that a coating composition, which is applied to the metal surface, can be obtained by means of a method comprising hydrolysis and polycondensation of one or several silanes or general formula (I), wherein the groups X mean are identical or different from each other and mean hydrolyzable groups or hydroxyl groups, wherein radicals R are identical or different from each other and stand for hydrogen, alkyl, alkenyl or alkinyl groups with up to 12 carbon atoms and aryl, aralkyl and alkaryl groups with 6 to 10 carbon atoms, and n means 0.1 or 2, with the proviso that at least one silane is used with n= 1 or 2 or oligomers derived therefrom, in the presence of nanoscaled SiO2 particles and/or b) at least one compound from the group of oxides and hydroxides of the alkaline metals or alkaline earth metals. The coating arising therefrom can be thermally compressed to form a vitreous layer.
摘要:
The invention relates to a catalytic composition, comprising a coating which consists of a coating mass on a support. The composition can be obtained by applying the coating mass, which comprises (1) a polycondensate consisting of at least one hydrolyzable organosilane and optionally, one or more compounds of glass-forming elements, and (2) particles of one or more transition metal oxides, the weight ratio of transition metal oxide particles to polycondensate being 10:1 to 1:10, to the support and heat-treating the applied coating mass. The invention also relates to a method for producing this catalytic composition and to its use for deodorization or for oxidizing organic components or carbon.
摘要:
The invention relates to a method for protecting a metallic substrate against corrosion which results in the formation of a species X derived from the metal. A coating composition based on (hetero)polysiloxanes produced by hydrolysis and condensation is applied to the substrate and hardened. The inventive method is characterised in that said coating composition comprises at least one species Z which reacts or interacts with the metal to form a species Y. Species Y has a more negative enthalpy of formation than species X.