摘要:
Beschrieben wird ein Hitzeschutzelement mit mindestens einem Trägerelement und einer Schutzschicht. Die Schutzschicht ist eine wasserhaltige Silikatzusammensetzung, die erhältlich ist aus Alkalimetalloxid und einer Siliziumdioxid enthaltenden wässrigen Dispersion, welche sich dadurch auszeichnet, dass sie das Silizimdioxid in Form von (i) Fällungskieselsäure oder (ii) pyrogener Kieselsäure und/oder Fällungskieselsäure und Kieselsol enthält. Eine solche Dispersion ist durch Zusatz von Polyol und Alkalihydroxid, insbesondere Kaliumhydroxid, stabilisiert und wird vorzugsweise durch Zugabe von Kalilauge verfestigt.
摘要:
The invention relates to a method for producing a dispersion containing silicon dioxide particles and cationization agent by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m 2 /g, and 100 to 300 μg of cationization agent per square meter of BET surface area of the silicon dioxide particles, wherein the cationization agent can be obtained by reacting at least one haloalkyl-functional alkoxy silane, the hydrolysis products or condensation products thereof, and/or a mixture of the aforementioned substance with at least one amino alcohol and a defined amount of water and optionally removing the formed hydrolysis alcohol at least partially from the reaction mixture. The invention further relates to a method for producing a dispersion containing silicon dioxide particles and cationization agent by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m 2 /g, and 100 to 300 μg of a cationization agent per square meter of BET surface area of the silicon dioxide particles, wherein the cationization agent comprises one or more quaternary, amino-alcohol-functional, organosilicon compounds of the general formula III and/or condensation products thereof, where R u and R v are, independently of each other, an alkyl group having 2 to 4 carbon atoms, m = 2 to 5, and n = 2 to 5.
摘要:
The present invention relates to an improved process for producing a biodegradable and/or bioabsorbable silica sol material, which is advantageous especially with regard to the reproducibility of the material, the rapidity of the synthesis and the possibility of producing the silica sol material on an industrial scale. The invention further relates to a biodegradable and/or bioabsorbable silica sol material which can be produced by the synthesis process according to the invention.
摘要:
A modified sol-gel method to create metal-rich siliceous material, such as colloidal silica or aluminosilicate particles is disclosed. Initially, the metal salt of choice is added to a silicic acid solution or a silicic acid solution containing aluminum salt. The aluminum is added to vary the metal-support interaction as it forms Al-O-Si linkages within the silica matrix. Besides aluminum, other metals can be added that form M-O-Si (M=Ti, B, etc.) linkages, which do not become reduced when treated with a reducing agent. Once the metal, silicic acid and/or aluminum salt is generated, it is subjected to colloidal growth by addition to a basic heel. Upon colloidal synthesis, the metal salt containing colloidal particle is left as is to maximize colloidal stability or is reduced with hydrazine to produce the zero valence metal-containing colloidal particle. Keeping a particle colloidal before use may be an effective method of forming a catalyst material as it can be easily spray-dried or mixed with other materials for extruded catalyst particles.
摘要:
Colloidal silica having a controllable broad particle size distribution and a controllable minimum particle size is disclosed and claimed. Particles below a predetermined size are excluded from the product colloidal silica of the invention. A method for continuously producing the desired colloidal composition is disclosed comprising the steps of providing preformed silica particles having a surface area which controls the particle size of the colloidal silica product, adding a feed silica comprising an alkaline solution and silicate at a feed rate which is less than a nucleation rate.
摘要:
Beschrieben wird ein Hitzeschutzelement mit mindestens einem Trägerelement und einer Schutzschicht. Die Schutzschicht ist eine wasserhaltige Silikatzusammensetzung, die erhältlich ist aus Alkalimetalloxid und einer Siliziumdioxid enthaltenden wässrigen Dispersion, welche sich dadurch auszeichnet, dass sie das Silizimdioxid in Form von (i) Fällungskieselsäure oder (ii) pyrogener Kieselsäure und/oder Fällungskieselsäure und Kieselsol enthält. Eine solche Dispersion ist durch Zusatz von Polyol und Alkalihydroxid, insbesondere Kaliumhydroxid, stabilisiert und wird vorzugsweise durch Zugabe von Kalilauge verfestigt.
摘要:
The present invention is directed to a method for determining the presence of a residue on or within a fingerprint using matrix-assisted mass spectrometric techniques. The matrix-assisted mass spectrometric technique can be selected from Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry Time-Of-Flight Mass Spectrometry (MALDI-TOF-MS) and/or Surface Assisted Laser Desorption/Ionisation Time-Of-Flight Mass Spectrometry (SALDI-TOF-MS).
摘要:
Colloidal compositions and methods of preparing same are provided. The colloidal compositions include a silicate and a metal dispersed therein. The colloidal compositions can further include a stabilizer, such as a quaternary amine, to enhance the and dispersion of the metal loading within the silicate. The colloidal compositions can be made such that the metal is dispersed within the silicate in a controlled manner.
摘要:
The invention relates to an aqueous sol containing silica-based particles which has an S-value within the range of from 10 to 45%, a viscosity within the range of from 5 to 40 cP and a silica content of at least 10% by weight. The invention further relates to use of the aqueous sol containing silica-based particles as a drainage and retention aid in the production of paper as well as a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optional filler, in which an aqueous sol containing silica-based particles and at least one charged organic polymer are added to the cellulosic suspension.