152 results about "Colloidal Silicon Dioxide" patented technology

The present invention provides a sulfonic acid-modified colloidal silica which has excellent long-term stability of metal adsorption amount and is capable of suppressing the amount of residual abrasive grains on a polished metal surface after polishing and cleaning.　This sulfonic acid-modified colloidal silica contains silica particles, and is characterized in that: (1) the surfaces of the silica particles are modified with a sulfonic acid group; (2) the Cu ion adsorption amount of the silica particles is 5.00-110.00 µmol / g; (3) the ratio (Cu ion adsorption amount (µmol / g) / S content (µmol / g)) of the Cu ion adsorption amount to the S content of the silica particles is 0.50 or more; and (4) the rate of change over time of the Cu ion adsorption amount of the silica particles is 1.30 or less as measured by the measurement method described below. [Measurement method of the rate of change over time of the Cu ion adsorption amount of the silica particles] The sulfonic acid-modified colloidal silica is left to stand at 25°C for 3 months. The Cu ion adsorption amount (µmol / g) of the silica particles before standing and the Cu ion adsorption amount (µmol / g) of the silica particles after standing are measured and the rate of change over time of the Cu ion adsorption amount of the silica particles is calculated by the following formula. (Rate of change over time of Cu ion adsorption amount of silica particles) = (Cu ion adsorption amount (µmol / g) of silica particles after standing) / (Cu ion adsorption amount (µmol / g) of silica particles before standing)

There is provided a pharmaceutical dosage form that is suitable for peroral administration to the gastrointestinal tract, which dosage form comprises a pharmaceutical composition in the form of a particulate mixture comprising solid particles of N-butyloxycarbonyl-3-(4-imidazol-1-ylmethylphenyl)-5-iso-butylthiophene-2-sulfonamide (C21), or a pharmaceutically-acceptable salt thereof, admixed with a blend of carrier particles with weight- and / or a volume-based mean diameter, and / or a structural / particle density, that is / are similar to the weight- and / or volume-based mean diameter, and / or the structural / particle density, of the solid particles of C21, and a glidant, which composition is contained within a capsule that is suitable for such peroral administration. Preferred carrier particles have a weight- and / or a volume-based mean diameter that is less than about 100 μm. Preferred carrier particle materials include mannitol. Preferred glidants comprise colloidal silica. Such dosage forms find utility in the treatment of lung diseases, such as idiopathic pulmonary fibrosis, sarcoidosis and respiratory virus-induced tissue damage.

Provided is a water-based inorganic coating agent capable of forming a coating film having high antifouling properties and excellent abrasion resistance. The aqueous inorganic coating agent includes colloidal silica, at least one of a sodium phosphate compound and a potassium phosphate compound, boric acid, aluminum monophosphate, and water.

The invention relates to a sample preparation method for EBSD detection of a MoSi target material, and the sample preparation method comprises the following steps: carrying out cutting, grinding treatment, mechanical polishing and chemical mechanical polishing on the MoSi target material in sequence to obtain a to-be-detected sample; a polishing solution adopted in the chemical mechanical polishing treatment comprises a basic solution, an acid solution and colloidal silicon dioxide, the polishing solution comprises 0.5-1 part by weight of the acid solution based on 100 parts by weight of the basic solution, and the concentration of the acid solution is 5-10 wt%; the MoSi target material sample prepared through the sample preparation method is smooth in surface, the roughness is as low as nanoscale, no obvious scratches exist, when the MoSi target material sample is used for EBSD detection, a diffraction Kikuchi zone is clear, the sample calibration rate reaches up to 90% or above, and a reliable detection sample is provided for research of microstructure characteristics of the MoSi material.

A composition comprises an aqueous dispersion of polymer particles, polymeric organic crosslinked microspheres, and colloidal silica particles. The composition is useful in coating compositions for exterior applications to achieve a balance of excellent dirt pickup resistance and durability performance under accelerated testing conditions.

The present disclosure is directed to coating compositions that include about 10 wt. % to about 90 wt. % water, about 5 wt. % to about 80 wt. % of a binder, and about 0.1 wt. % to about 20 wt. % of a colloidal silica functionalized with anionic molecules and / or a colloidal silica functionalized with neutral molecules. The present disclosure also is directed to methods of making coating compositions of the present technology.

The application belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to a co-doped mesoporous carbon sphere wave absorbing material, a preparation method and an application. The preparation method comprises the following steps: aniline is added into a colloidal silica hydrochloric acid solution and uniformly mixed to obtain a mixed solution; then, ammonium persulfate hydrochloric acid solution is added into the mixed solution and uniformly mixed; drying is performed to obtain a precursor; the precursor is calcined under a protective atmosphere to obtain an intermediate; then, the intermediate and a sodium hydroxide solution are mixed, heated, and treated to obtain the co-doped mesoporous carbon sphere wave absorbing material. The calcination method comprises the following steps: the precursor is heated to 250-350 DEG C under a protective atmosphere and then heated to 700-900 DEG C for calcination. The co-doped mesoporous carbon sphere wave absorbing material has excellent wave absorbing performance.

A nasal pharmaceutical composition comprising a porous excipient and an active agent, wherein the active agent is loaded onto a surface of the porous excipient located within pores of the porous excipient, wherein the porous excipient is an inorganic porous material selected from colloidal silicon dioxide, mesoporous silica, microporous silica and macroporous silica, and wherein the loaded porous excipient is dispersed in a gel, the gel comprising a vehicle comprising an oil or a mixture of oils, and wherein the composition is designed for nasal administration.

The invention relates to the technical field of alloys, in particular to a magnesium alloy spraying pretreatment process. According to the process, after alkali washing and acid activation are conducted on magnesium alloy, pre-adsorption and main conversion treatment are conducted in sequence. Both the pre-adsorption liquid A and the main conversion liquid B contain polyether / zwitterionic modified colloidal silicon dioxide mother liquor, the mother liquor is obtained through amination, polyether, tertiary amination and zwitterionic modification of colloidal silicon dioxide, and the dispersion stability and interfacial compatibility of the colloidal silicon dioxide in an acidic fluorine-containing environment are remarkably improved. A uniform and compact conversion film is formed on the surface of the treated magnesium alloy, and the coating is high in binding force, high in corrosion resistance, excellent in appearance and suitable for high-end application such as 3C product shells.

The present disclosure provides oral dosage forms comprising about 8.75% w / w deuruxolitinib phosphate, about 50% to about 60% w / w microcrystalline cellulose, about 25% to about 35% w / w lactose monohydrate, about 3% to about 6% w / w polyvinylpyrrolidone, about 2% to about 4% w / w hydroxypropyl cellulose, about 0.25% to about 0.75% w / w colloidal silicon dioxide, and about 0.25% to about 0.75% w / w magnesium stearate.

The application belongs to the technical field of layered composite film preparation, and provides an online coating high-barrier biaxially stretched polyethylene film and a preparation method and application thereof. First, polyethylene multilayer sheet is co-extruded and longitudinally stretched, and a to-be-coated base film is obtained through corona activation; then, nano clusters are constructed from phytic acid and zirconium salt, and a hybrid dispersion liquid is formed by introducing tannic acid, polyallylamine hydrochloride and epoxy silane; at the same time, sodium-based montmorillonite and colloidal silicon dioxide are compounded under the action of tannic acid and treated by silane to obtain a barrier dispersion liquid; the barrier dispersion liquid, polyvinyl alcohol, polyvinylpyrrolidone and polyhydric alcohol are prepared into an aqueous coating composition, which is coated on the base film online, dried and solidified, and then transversely stretched to obtain a film with stable oxygen and water vapor barrier properties and suitable for packaging applications.

The present invention provides an aqueous inorganic coating agent capable of forming a highly stain-resistant film on various substrates. [Solution] An aqueous inorganic coating agent comprising colloidal silica, at least one of a sodium phosphate compound and a potassium phosphate compound, boric acid, an inorganic thickener, and water.

The present application relates to the technical field of welding material, in particular to a high-toughness gas shielded welding wire and a preparation method thereof.The welding wire comprises a low-carbon steel belt sheath and a flux cored powder, and the flux cored powder comprises reduced iron powder, manganese powder, carbonyl nickel powder, molybdenum powder, titanium powder, silicon powder, graphite powder, rutile titanium dioxide, calcium fluoride, potassium fluorotitanate and cerium-aluminum co-doped microparticle powder; the cerium-aluminum co-doped microparticle powder takes calcium-rich borosilicate as a core, is treated by isopropanol aluminum hydrolysis polycondensation sealing, aluminum oxide nanoparticle enhancement, aluminum nitrate-colloidal silicon dioxide bridging and cerium nitrate outer layer, and is prepared; the welding wire is suitable for high-strength steel thick plate multi-layer multi-pass gas shielded welding, can improve low-temperature impact toughness and refine inclusions while maintaining high deposited metal strength.

The invention discloses a galanthamine hydrobromide enteric-coated tablet and a preparation method thereof. The tablet is composed of a tablet core, an isolation layer and an enteric layer, the tablet core contains 5.0%-16.0% of galanthamine hydrobromide, and auxiliary materials such as mannitol, a mixture of magnesium stearate and sodium stearyl fumarate in a specific proportion, colloidal silicon dioxide and the like are matched; the isolating layer adopts an opadry II type film coating, and the enteric-coated layer adopts an opadry Acryl-EZE II type enteric-coated coating. The dissolution rate of the tablet in an acidic medium with the pH value of 1.2 for 2 hours is less than 5%, the release rate of the tablet in a medium with the pH value of 5.5 or 6.8 for 45 minutes is more than or equal to 80%, the tablet is sealed and placed at 40 DEG C + / -2 DEG C / 75% + / -5% RH for 6 months, the stability is good, and the pharmacokinetic parameters are excellent. The preparation method comprises the steps of raw and auxiliary material pretreatment, graded premixing, total mixing and lubricating, tabletting, two-step coating and the like, and the process is stable and controllable. The enteric-coated tablet disclosed by the invention is strong in targeted release property, high in stability and good in bioavailability, and can guarantee the effectiveness and safety of medication.

The invention belongs to the technical field of coating preparation, and provides a fireproof heat-insulating nano ceramic coating for a lithium battery and a preparation method of the fireproof heat-insulating nano ceramic coating. The coating is a water-based two-component system, in a first component, bisphenol A diglycidyl ether, compound colloidal silicon dioxide, boehmite and nano zirconium oxide and / or nano aluminum oxide are used for constructing a ceramic skeleton, and aerogel, hollow glass beads, expanded vermiculite and / or flaky mica and inorganic fibers are combined to form a heat insulation network; the flame-retardant system contains ammonium polyphosphate, pentaerythritol, melamine components, zinc borate and sealing glass powder, silane interface bonding components and thermal expansion microspheres are introduced, an expansion thermal insulation layer is formed when the flame-retardant system is heated, and the flame-retardant system is densified into a hard shell at high temperature; the second component is a water dispersible amine curing agent; the preparation method comprises the following steps: adding the interface bonding components step by step, and sequentially compounding the inorganic phase and the flame-retardant heat-insulating phase to obtain the double-component packaged coating which is suitable for safety protection of a lithium battery system.

The present invention provides a citric acid-containing colloidal silica in which the formation of coarse particles having a size of 0.20 μm or greater when a shear force is applied is suppressed.　The present invention is a citric acid-containing colloidal silica comprising silica particles and citric acid, the citric acid-containing colloidal silica being characterized in that (1) the density of silanol groups per unit surface area of the silica particles is 1.6 x 1019 to 14.5 x 1019 groups / m2, and (2) the content of citric acid per unit surface area of the silica particles is 1.0 to 10.0 μg / m2.

The application discloses an olmesartan medoxomil and amlodipine besylate pharmaceutical composition and a preparation method thereof, and belongs to the technical field of medicines. The olmesartan medoxomil and amlodipine besylate pharmaceutical composition takes olmesartan medoxomil and amlodipine besylate as active ingredients, and is prepared into antihypertensive tablets by being matched with a disintegrant, a filler and a lubricant; wherein the filler is a mixture of pre-gelatinized starch and a co-processed product of microcrystalline cellulose and colloidal silicon dioxide. The preparation method adopts a direct compression process, and sequentially comprises the steps of mixing, whole-granulating, twice mixing, lubricating, tabletting and stomach-soluble film coating, and is simple in process and suitable for industrialized scale-up production. The application effectively solves the problem of low dissolution rate of the existing olmesartan medoxomil and amlodipine besylate tablets, and the prepared tablets have the advantages of high dissolution rate, similar dissolution curve to commercial preparations, high bioavailability, stable quality and good clinical application value.

Provided are an ink jet ink, an ink set, and an image recording method, in which an image with an excellent covering property can be recorded and abrasion deterioration of an ink jet head can be suppressed. The ink jet ink is an ink jet ink including water, titanium dioxide particles, and a silicon compound, in which an average primary particle diameter of the titanium dioxide particles is 100 nm or greater, the silicon compound is at least one selected from the group consisting of a silicate and colloidal silica, a content of the silicon compound is 0.0020% by mass or greater with respect to a total amount of the titanium dioxide particles, and a ratio of a volume average particle diameter of the colloidal silica to the average primary particle diameter of the titanium dioxide particles is 0.04 or less.

This invention provides an aqueous inorganic coating agent that has high stain resistance and can form a film with suppressed interference fringes, and a coating method using this aqueous inorganic coating agent. [Solution] An aqueous inorganic coating agent comprising a potassium silicate compound, colloidal silica, a sodium phosphate compound, boric acid, and water, wherein the content of the potassium phosphate compound is less than 0.10% by mass of the solid content of the aqueous inorganic coating agent.

The application relates to the technical field of medicine preparation, and particularly discloses a levodopa-benserazide tablet, a preparation method and application thereof, which comprises levodopa granules, benserazide hydrochloride granules, cross-linked polyvinylpyrrolidone and magnesium stearate; the levodopa granules are composed of levodopa, anhydrous calcium hydrogen phosphate, pregelatinized starch, cross-linked polyvinylpyrrolidone, red iron oxide and sodium docusate; and the benserazide hydrochloride granules are composed of benserazide hydrochloride, mannitol, microcrystalline cellulose, colloidal silicon dioxide, red iron oxide and ethyl cellulose. The related substances and the friability of the levodopa-benserazide tablet meet the production requirements, the stability is high, and the tablet is suitable for large-scale production.

The invention provides colloidal silicon dioxide with controllable association degree as well as a preparation method and application thereof, and belongs to the technical field of polishing solutions. The method comprises the following steps: firstly, heating ultrapure water to a reflux state, dropwise adding alkyl silicate hydrolysate until the pH value of the solution is acidic, curing to obtain a mixed solution A, continuously dropwise adding the alkyl silicate hydrolysate until particles grow to a target particle size, and heating and concentrating to remove alcohol to obtain colloidal silicon dioxide with controllable association degree. The prepared colloidal silicon dioxide is wide in association degree adjustable range, good in stability and good in dispersity and can serve as grinding particles of a CMP polishing solution, and the method is easy to operate, low in cost and suitable for large-scale production.

To provide an anti-fogging agent composition capable of forming an anti-fogging coating film excellent in transparency, adhesion and anti-fogging properties and excellent in appearance and anti-fogging properties after a moisture resistance test and repeated dew condensation resistance even in a thick film.SOLUTION: An antifogging agent composition containing a copolymer (A) and colloidal silica (B), wherein the copolymer (A) is a (meth) acrylate copolymer obtained from a monomer mixture, and the monomer mixture contains a (meth) acrylate monomer (a- 1) having an epoxy group, a monomer (a- 2) represented by the general formula (1), and a hydrophobic (meth) acrylate monomer (a- 3) having a hydrocarbon group.SELECTED DRAWING: None

The invention discloses a preparation method of high-solid-content colloidal silicon dioxide and a product. According to the method, active silicic acid is used as a raw material, a seed growth method is adopted, a compound stabilizer composed of alkali metal hydroxide and organic alkali is introduced in the growth process, and a gradient heating curing process is matched. The colloidal silicon dioxide with the solid content up to 50-60wt%, excellent stability and narrow particle size distribution is successfully prepared by regulating and controlling the particle structure and uniformity through the synergistic stabilization effect of the compound stabilizer and the gradient temperature. The method is mild in process condition, low in raw material cost and suitable for industrial production and application.

The present invention relates to colloidal silicon dioxide containing silicon dioxide particles with a small average secondary particle size and dispersion stability that can be maintained for extended periods even under strongly acidic conditions at a pH of 3 or less, and to a method for its preparation. The present invention relates to colloidal silicon dioxide comprising silicon dioxide particles, wherein the silicon dioxide particles have an average secondary particle size of 20 nm or less, as measured by dynamic light scattering, and a zeta potential of -20 mV or less, as measured at a pH of 3, and are surface-modified with a sulfonic acid group.

The present invention provides colloidal silica containing silica particles excellent in compactness and excellent in maintenance of the bumpy surface under basic conditions, and provides a method for producing the colloidal silica. The present invention provides colloidal silica containing silica particles having a bumpy surface, wherein (1) the silica particles have a content of alkoxy groups of 1000 ppm or more, and (2) the silica particles have a reduction in specific surface area of 15.0% or less when the silica particles are heated under basic conditions.

The invention claimed herein relates to a dielectric polishing composition and a method thereof. The invention claimed herein particularly relates to a composition comprising: (A) surface-modified colloidal silica particles comprising negatively charged groups on the surface of the particles, wherein the surface-modified colloidal silica particles have a negative charge, a particle size of 60 nm to 200 nm, and a zeta potential of < -35 mV at a pH in the range of > 2.0 to < 6.0; (B) at least one corrosion inhibitor selected from at least one guanidine derivative; (C) at least one iron (III) oxidizing agent; (D) at least one buffering agent selected from at least one basic amino acid having an isoelectric point (pi) of > 6.5; (E) at least one stabilizer; and (F) an aqueous medium, wherein the pH of the composition is in the range of > 2.0 to < 4.3, and wherein the composition has a polyacrylamide content of < 1 ppm.

The invention discloses an efficient potassium titanyl phosphate crystal polishing solution as well as a preparation method and a polishing method thereof. The cleaning agent is prepared from raw materials in percentage by weight as follows: 5%-15% of colloidal silicon dioxide, 0.1%-1% of a chelating agent, 0.5%-3.0% of an oxidizing agent, 0.01%-0.1% of a surfactant and the balance of deionized water. The pH regulator is added after the raw materials are mixed, and the mixed solution is regulated to be weakly acidic. The efficient potassium titanyl phosphate crystal polishing solution is scientific in composition proportion, and the problems that in the prior art, potassium titanyl phosphate crystals are low in polishing efficiency, poor in surface quality and the like can be solved.

Provided are a colloidal silica having few microparticles, and a method for producing the colloidal silica.

This disclosure relates to compositions comprising water and functionalized colloidal silica, wherein the functionalized colloidal silica comprises silica particles (each silica particle comprising a surface) and structural units according to formulas I, II, III and / or IV (I)(II)(III)(IV). This disclosure also discloses methods for manufacturing the compositions of this technology.

The application discloses a preparation method of sodium zirconium cyclosilicate powder, and comprises the following operation steps: S1, zirconium acetate, colloidal silicon dioxide, sodium hydroxide and deionized water are mixed according to a preset molar ratio, and mechanical stirring is carried out under ultrasonic conditions to form a uniform slurry; S2, the slurry is subjected to microwave heating, reacts at a preset temperature for a preset time, and then is subjected to gradient cooling to obtain a reaction product; S3, the reaction product is sequentially subjected to filtration, washing, protonation treatment and drying to obtain sodium zirconium cyclosilicate powder; S4, the sodium zirconium cyclosilicate powder is crushed and sieved to control the particle size distribution; and S5, the sodium zirconium cyclosilicate powder with the particle size controlled is mixed with medicinal excipients to prepare a powder. The application can ensure that the product has high purity and high potassium ion exchange capacity, controls the particle content at a very low level, shortens the reaction time and improves the reaction efficiency.