Abstract:
A process for the production of silica-bound zeolite granulates is disclosed, wherein zeolite to be formed into a granulate is mixed with silica sol. The process is carried out by adding aqueous alkali metal silicate to the silica sol immediately before the silica sol is mixed with the solid zeolite to be granulated. By the described process, granulates of various grain sizes can be obtained, and the resultant granulates can have a narrow grain size distribution.
Abstract:
A lacquer comprising an organic binder, at least one pigment or filler, and a zeolite in an amount sufficient to increase the dispersibility of the pigment or filler. Advantageously the pigment is at least one of titanium dioxide, iron oxide and mixed-phase rutile, and the binder is a polyester. Desirably the pigment is present in from about 1 to 5% by volume of the pigment plus any filler and its average particle size is from about 1 to 3 .mu.m.
Abstract:
A process for the production of synthetic zeolite with the crystal structure of faujasite and with a composition corresponding to the formula:Na.sub.2 O . Al.sub.2 O.sub.3 . (2.5 .+-. 0.5) SiO.sub.2 . n H.sub.2 O(n = 0 to 8)comprising forming a reaction mixture containing Na.sub.2 O, Al.sub.2 O.sub.3, SiO.sub.2 and H.sub.2 O at a temperature of about 60.degree. to 105.degree. C in the presence of about 1 to 20% of finely divided zeolite A based on the weight of Na.sub.2 O + Al.sub.2 O.sub.3 + SiO.sub.2, thereby to form a precipitate which crystallizes to form a synthetic zeolite of faujasite structure. Advantageously the molar ratios of the oxides in the reaction mixture, exclusive of the added zeolite A, are approximately:SiO.sub.2 /Al.sub.2 O.sub.3 = 3 to 5Na.sub.2 O/SiO.sub.2 = 1.2 to 1.5H.sub.2 O/Na.sub.2 O = 35 to 45.Even if the mass is stirred during crystallization, little or no phillipsite is produced.
Abstract:
A light-permeable heat-protection element including at least one support element and at least one protective coating containing a reaction product which includes an aqueous alkali silicate solution and aluminate-modified or borate-modified silicon dioxide.
Abstract:
Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.
Abstract:
The present invention relates to a process for producing nanosize to microsize particles of compounds of the rare earth metals and other transition metals and also for producing colloid-chemically stable sols of these particles.
Abstract:
Use of silica sols containing sulfonic acid groups and/or mercapto groups as nicroparticles in paper production, in particular for paper retention.
Abstract:
Provided is a novel high selectivity aqueous slurry composition method of utilizing same. The composition includes non-modified silica based abrasive particles in an amount of about 5 to about 50 weight percent, and an organic compound in an amount of about 0.001 to about 2.0 weight percent in an aqueous solution, wherein the silicon oxide to silicon nitride selectivity ratio ranges from about 50 to about 700.
Abstract:
The present invention relates to binder-free molecular sieve zeolite granules of lithium zeolite A and lithium zeolite X, a process for preparing these molecular sieve zeolite granules and their use for preparing nitrogen or oxygen from air by pressure swing adsorption.
Abstract:
The present invention relates to colloidal metal oxides having blocked isocyanate groups, which are based on the reaction product ofA) blocked isocyanate group-containing silanes corresponding to formula (I) ##STR1## wherein R represents hydrogen or an organic group having 1 to 40 carbon atoms,X, Y and Z represent identical or different organic groups having 1 to 30 carbon atoms which are inert to isocyanate groups below 100.degree. C., provided that at least one of these groups is a C.sub.1 -C.sub.4 -alkoxy group,Q represents an organic group which contains at least one isocyanate group reacted with a blocking agent andn is 2, 3 or 4 withB) colloidal metal oxides selected from Al, Si, Ti, Ta, W, Hf, Zr, Sn and Y.The present invention also relates to the use of modified metal oxides, either alone or in combination with compounds containing at least two isocyanate-reactive groups, for the preparation of optionally expanded polyurethane plastics, lacquers or coating agents.