摘要:
A lacquer system which essentially comprises a silicic acid heteropolyconsate, a flake-shaped or lamellar filler, a solvent and, if appropriate a conventional synthetic resin for lacquers is suitable for producing anti-corrosion coatings, especially on glass surfaces.
摘要:
A lacquer system which essentially comprises a silicic acid heteropolyconsate, a flake-shaped or lamellar filler, a solvent and, if appropriate, a conventional synthetic resin for lacquers is suitable for producing anti-corrosion coatings, especially on glass surfaces.
摘要:
A method of heat-sealing substrates, particularly glass to glass or glass to other materials, which comprises using as a heat-sealing medium a silicic acid heteropolycondensate prepared by hydrolysis and polycondensation of at least one organosilane and at least one component selected from the group consisting of silicon-functional silanes, substantially involatile oxides soluble in the reaction medium, or compounds convertible thereto, and organofunctional silanes.The heat-sealing bonds obtained are strong, durable and moisture resistant, the excellent moisture resistance being of special benefit in the heat-sealing of glass substrates.
摘要:
Silicic acid heteropolycondensates made from hydrolyzable silicic acid derivatives and substituted silanes, optionally with either or both of one or more functional silanes and non-volatile metal oxides or their precursors are made by a known technique, in which the reaction mixture is hydrolyzed and condensed by the action of water and a condensation catalyst, the latter being employed in an amount up to 3% by weight, based upon the weight of the reaction mixture. Improved heteropolycondensates usable as adsorbents and porous membranes can be made by using greater amounts of catalyst, ranging up to 75% by weight, based upon the weight of the reaction mixture. These improved products are very stable in use and are characterized by a pore structure which includes fine pores and coarse pores, whereby products in the form of membranes can have an asymmetrical structure, if desired.
摘要:
A process for the production of silicic acid heteropolycondensates wherein at least one substituted silane; at least one functional silane; at least one hydrolysable silicic acid derivative and optionally at least one substantially involatile oxide soluble in the reaction medium, or a compound convertible thereto, are condensed in the presence of at least the quantity of water stoichiometrically required for hydrolysis and optionally in the presence of a condensation catalyst and/or a solvent.The heteropolycondensates prepared by this process are useful in the preparation of coatings for substrates, which coated substrates are useful as supports in the culture of living cells.
摘要:
Membranes based on silicic acid heteropolycondensates are produced by hydrolytic polycondensation of at least one silicic acid derivative in the presence of water and, if appropriate, a condensation catalyst, the polycondensation being carried out at the surface of a support, which supports the resulting membrane. The reactants can be fed to the surface of the support via the gas phase or via one or more liquid phases.
摘要:
A process for the production of silicic acid heteropolycondensates, wherein at least one hydrolysable silicic acid derivative; at least one substituted silane; optionally at least one functional silane and/or optionally at least one substantially involatile oxide soluble in the reaction medium or at least one compound forming a substantially involatile oxide are condensed in the presence of at least the quantity of water stoichiometrically required for hydrolysis and optionally in the presence of a condensation catalyst and/or a solvent. The polycondensates are useful in the production of membranes and adsorbents.
摘要:
Metallic substrates with a vitreous or glass-ceramic pigmented protective layer are obtainable by applying an alkali metal silicate-containing coating sol to the substrate or a surface thereof and thermally densifying the layer thus obtained, said alkali metal silicate-containing coating sol comprising an oxidic pigment of at least one element selected from the third and fourth main or subgroups of the Periodic Table of the chemical elements and the transition metals Fe, Co, Ni, Cu, Zn, Nb and Ta.
摘要:
Metallic substrates having a deformable vitreous coating, obtainable by applying an alkali metal silicate-containing coating sol to the substrate and thermally densifying the layer thus obtained in a two-stage heat treatment process, the heat treatment being carried out, in the first stage, either (A) in an oxygen-containing atmosphere or (B) in a vacuum at a residual pressure of ≦15 mbar and, in the second stage, in a low-oxygen atmosphere up to full densification with formation of a vitreous layer.
摘要:
A method for producing a functional colloid during which particles are reactively fragmented in a mechanical manner in a dispersant in the presence of a modifying agent so that the modifying agent is chemically bound, at least in part, to the fragmented colloid particles.