44 results about "Silicon alkoxide" patented technology

The invention discloses a method for preparing synthetic quartz sand by a sol-gel method, which comprises the following steps: mixing silicon alkoxide and an alcohol solvent, and stirring to form a homogeneous solution marked as L1; mixing an acidic catalyst, an alcohol solvent and ultrapure water to form a mixed solution, and recording the mixed solution as L2; dropwise adding the L1 solution into the L2 solution, and continuously stirring and hydrolyzing to obtain sol; dropwise adding ammonia water into the sol until the pH value is 5-10, and standing in a vacuum drying oven to obtain wet gel; and drying and sintering the wet gel to obtain the high-purity synthetic quartz sand. The gelation time is accurately controlled through acid-base two-step catalysis, the production period is shortened, and the production efficiency is improved; meanwhile, the size and uniformity of silicon dioxide particles are controlled by controlling the dripping speed of a silicon source, so that the sintering temperature of the synthesized quartz sand is greatly reduced, and the solvent is recycled through distillation when wet gel is dried, so that the production cost is reduced, and the pollution to the environment is reduced.

The invention discloses high-viscosity dimethyl silicone oil and a preparation method thereof.The preparation method comprises the following steps that a siloxane polymer is heated, a basic catalyst is added in the inert gas atmosphere, and a first mixture is obtained; continuously heating and adding an end-capping reagent into the first mixture in a vacuum environment for reaction to prepare a second polymer; adding a neutralizer into the second polymer for reaction to obtain a third polymer; and heating and devolatilizing light components in the third polymer in a vacuum environment to obtain the finished product silicone oil. A high-viscosity dimethyl silicone oil product prepared by carrying out a catalytic reaction in a potassium hydroxide silanolate-silicon-based phosphate catalytic neutralization system and then using a linear siloxane oligomer as a main polymer has the advantages of low polymerization intermediate volatile matter, high product viscosity and low molecular weight distribution coefficient, and has a wide application prospect.

A gas barrier laminate includes a substrate layer containing a resin, an inorganic oxide layer, and a gas barrier coat layer in this order. The gas barrier coat layer is a cured article of a composition, and the composition contains a water-soluble polymer, a first silicon compound composed of a silicon alkoxide in formula (1) below, and a second silicon compound composed of a silicon alkoxide in formula (2) below. The ratio of the water-soluble polymer to the water-soluble polymer and the second silicon compound is 55 to 95% by mass, and the ratio of the first silicon compound to the first silicon compound and the second silicon compound is more than 0% by mass and 89% by mass or less. Si(OR1)4 ... (1) (R2Si(OR3)3)n ... (2) (in formulas (1) and (2) above, R1 and R3 each denote an alkyl group, and R2 denotes an organic functional group; n represents an integer equal to or greater than 1).

The invention belongs to the technical field of electro-catalytic materials, and particularly discloses an N / O co-doped carbon bowl electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing ammonia water, silicon alkoxide, alcohol and water to obtain a mixed solution; mixing the mixed solution, resorcinol and a formaldehyde solution, centrifuging to obtain a precipitation sample, and annealing the precipitation sample to obtain solid carbon nanospheres; the solid carbon nanospheres and an alkaline solution are subjected to an etching reaction, and an N / O co-doped carbon bowl electrode material is obtained; the time of the etching reaction is 90 to 100 hours. The prepared N / O co-doped carbon bowl electrode material is a metal-free carbon catalyst, and a prepared N / O co-doped carbon bowl electrode has high ORR activity, excellent 2e-selectivity and long-term stability, and has important significance for promoting acidic electrosynthesis of H2O2.

The invention belongs to the technical field of organic silicon synthesis, and particularly relates to low-ring-content silicone oil and a preparation method thereof, and the silicone oil comprises the following components in percentage by mass: 92-97% of DMC, 0.2-0.8% of crown ether, 0.5-2% of a phosphazene alkali silicon alkoxide catalyst, 0.4-2% of a phosphosilyl ester neutralizer and 0.35-3.5% of divinyl tetramethyl disiloxane. The novel phosphazene alkali silicon alkoxide catalyst and the phosphoric acid silicon ester neutralizer are adopted, so that the'back-biting 'cyclization phenomenon is greatly restrained in the polymerization process, and the reaction conversion rate and efficiency are improved; the Fe3O4-beta-cyclodextrin composite material is selected as an adsorbent of a ring body, so that the content of cyclosiloxane is reduced, the magnetic recovery rate is high, the thermal stability is high, and the biological safety is better; the volatile component content of the prepared low-ring-content silicone oil is less than 0.2% (150 DEG C / 3h), the ring content (D3-D10) is less than 200ppm, and the ring content meets the requirements of electronics, food and medical levels.

Provided is a durable, pigmented, transparent inorganic-organic hybrid sol-gel coating material that mitigates galvanic corrosion of metal substrates. The coating material is generally an acid-catalyzed condensation reaction product of an organic polymeric silane (e.g., a polyol functionalized with a silane such as isocyanatopropyltrimethoxysilane or isocyanatopropyltriethoxysilane via a urethane bond or a polyamine functionalized with a silane via a urea bond), an inorganic metal alkoxide (e.g., a silicon alkoxide such as tetraethoxysilane or tetramethoxysilane), and a metal oxide nanoparticle such as silica (SiCte), which may contain other additives such as colorants and / or corrosion inhibitors.

The invention also provides a briquette comprising:(i) a particulate material; and(ii) a binder, the binder comprising (a) at least partially saponified polyvinyl alcohol and (b) an alkali metal alkyl siliconate or polyalkylsilicic acid; wherein the particulate material is selected from a carbonaceous material, metal, metal ore, mineral waste or a mixture thereof.

A production method including: a step of forming, on a substrate layer containing a polypropylene resin or a polyester resin, a metal oxide layer by a vacuum film forming process; a step of applying a gas barrier coating layer-forming composition on the metal oxide layer to form a coating film; a step of preheating the coating film by infrared radiation; and a step of heating and thereby curing the coating film preheated by infrared radiation in an atmosphere at 50 to 120° C. to form a gas barrier coating layer, in which the gas barrier coating layer-forming composition contains at least one selected from the group consisting of an alkyl silicon alkoxide and its hydrolysate, and a water-soluble polymer.

A gas barrier laminate includes a substrate layer containing a resin, an inorganic oxide layer, and a gas barrier coat layer in this order. The gas barrier coat layer is a cured article containing a water-soluble polymer, a first silicon compound of a silicon alkoxide in formula (1) below, and a second silicon compound of a silicon alkoxide in formula (2) below. The ratio of the water-soluble polymer to the water-soluble polymer and the second silicon compound is 55 to 95% by mass, and the ratio of the first silicon compound to the first silicon compound and the second silicon compound is more than 0% by mass and 89% by mass or less. Si(OR1)4 . . . (1) (R2Si(OR3)3)n . . . (2) (in formulas (1) and (2) above, R1 and R3 each denote an alkyl group, and R2 denotes an organic functional group; n represents an integer equal to or greater than 1).

The present invention addresses the main problem of providing a coating agent composition for forming a coating layer that has high transparency, is extremely hydrophilic, and has an antifouling function and an antifogging function even in a low-temperature atmosphere. The present invention also addresses the problem of providing a method for producing the coating agent composition. Further, the present invention addresses the main problem of providing a product having a coating layer in which the coating agent is used.　Provided as means for solving said problems are: a production method for a coating agent composition, the method comprising (A) a step for causing a polymer obtained through polymerization of a silicon alkoxide to coexist with cerium hydroxide and / or cerium oxide to obtain an intermediate composition, and (B) a step for causing the intermediate composition obtained in said step (A) to coexist with an acidic colloidal silica to obtain a coating agent composition; and a coating agent composition comprising a polymer obtained through polymerization of a silicon alkoxide, cerium hydroxide and / or cerium oxide, and an acidic colloidal silica.

A gas barrier laminate for liquid packaging according to the present disclosure comprises a substrate layer, an inorganic layer, and an overcoat layer, in this order. The substrate layer contains a polyethylene, and the overcoat layer is obtained using an overcoat layer forming composition that contains a silicon compound and a water-soluble polymer. The silicon compound includes at least one of a silicon alkoxide, a hydrolysate thereof, and a polycondensate thereof, and the mass ratio of the silicon compound (in terms of SiO2) to the water-soluble polymer is 1.5-3.0.

Polymer derived ceramic (PDC) materials, compositions and methods of making high capacity, long cycle, long life battery anodes to improve the performance of batteries of all types, including but not limited to coin cell batteries, electric vehicle (EV) batteries, hybrid electric vehicle (HEV) batteries, plug-in hybrid electric vehicle (PHEV) batteries, battery electric vehicle (BEV) batteries, lithium cobalt (LCO) batteries, lithium iron (LFP) batteries; and lithium-ion (Li) batteries, and lead acid batteries. Silicon is incorporated in the PDC material at a molecular level when reacting a polymer derived ceramic precursor and a silicon hydride constituent or a silicon alkoxide constituent to form a PDC composition useful as a powdered battery anode material. A predetermined amount of divinylbenzene is added as a crosslinker and a modifier to increase free carbon content. The resulting battery anode materials increase the specific capacity of a battery measured in milliampere-hours per gram (mAh / g) and increase the life cycle of a battery while minimizing distortion and stress of the anode structure.

An exterior insulation and finish system (EIFS) having a finish layer with high PVC of inorganic fillers and / or pigments is provided, the stain resistance and / or color retention of the exterior insulation and finish system may be improved by adding an alkali metal silanolate to the finish layer in an amount effective to improve stain resistance and / or color retention.

This invention provides a method for producing silica nanocapsules without using reagents that are difficult to handle. [Solution] The present invention provides a method for producing silica nanocapsules containing a water-soluble compound, comprising hydrolyzing and dehydrating a silicon alkoxide in an aqueous solution containing a water-soluble compound to produce silica, wherein the water-soluble compound has a pyranone ring and a hydroxyl group. Furthermore, the present invention provides a method for producing porous silica nanocapsules, further comprising dispersing the water-soluble compound-encapsulated silica nanocapsules obtained by the above method in water or an aqueous solution to elute the water-soluble compound from the water-soluble compound-encapsulated silica nanocapsules.

To provide a catalyst for ethylene oxide polymerization composed of particles containing a primary amino group, a method for producing the catalyst for ethylene oxide polymerization, and a method for producing various monomers using the catalyst for ethylene oxide polymerization.SOLUTION: The present invention provides a catalyst (α) for ethylene oxide polymerization composed of particles containing a primary amino group, and / or, a catalyst (α) for ethylene oxide polymerization composed of particles containing a primary amino group, which is a reaction product of components including a polymer (α1) having at least one protected isocyanate group and at least one silicon alkoxide group as side chains of the polyethylene main chain.SELECTED DRAWING: None

Disclosed herein is a process for making a coated cathode active material, where the process includes the following steps:(a) providing an electrode active material according to general formula Li1+xTM1−xO2, where TM is a combination of metals according to general formula (I), and x is in the range of from zero to 0.2, with a moisture content in the range of from 500 to 1,500 ppm,(b) reacting the electrode active material with a silicon alkoxide and an alkyl aluminum compound in one or more sub-steps, and(c) heat-treating the material so obtained in an oxygen-containing atmosphere at a temperature in the range of from 100 to 400° C. for 10 minutes to 4 hours.

The present disclosure relates to a water-based inkjet ink formulation, which comprises a solvent containing water, at least one colorant and at least one alkali metal organosiliconate having formula (I): #imgabs0# wherein: R is a C1-C5 alkyl group; M1, M2 and M3 are each independently selected from hydrogen or a cation of an alkali metal, wherein at least one of M1, M2 and M3 is a cation of an alkali metal. The water-based inkjet ink formulation is used in a method for preventing or minimizing print head degradation. The present disclosure also relates to a printing method using the water-based inkjet ink formulation and a printing system including the formulation.

The present invention relates to a method for treating gypsum comprising a silicon alkoxide, the treatment comprising the steps of: (i) stirring an aqueous gypsum suspension with a solution of an alkali metal and / or alkaline earth metal hydroxide having a pH of 10 or higher and separating solid components from the aqueous gypsum suspension. By treatment with alkali metal and / or alkaline earth metal hydroxides, the detrimental effects of silicon alkoxides on subsequent foams prepared with the gypsum thus treated are significantly reduced. The invention also relates to a process for preparing a foamed gypsum composition and a gypsum board comprising such a process, correspondingly prepared gypsum and gypsum boards, and the use of an alkali metal and / or alkaline earth metal hydroxide solution for inactivating silanolates in a gypsum recycle.

The invention relates to a method for protecting a substrate against fire and / or heat, using a fire-resistant material. The material comprises an assembly of man-made vitreous silicate mineral fibers impregnated with an aluminosilicate composition prepared by a sol-gel process comprising mixing a silicon alkoxide and an aluminum alkoxide in an aqueous solvent. This material is particularly effective for protecting heat-sensitive substrates against heat and / or fires with a temperature higher than 1800° C.

[Problem] To provide a silicon oxide-coated soft magnetic powder having a silicon oxide coating with few defects so as to have an excellent insulation property, and having good dispersibility in an aqueous solution, and capable of obtaining a high filling factor when molding a green compact.[Means for Solution] A highly insulating silicon oxide-coated soft magnetic powder, in which the ratio of a volume-based cumulative 50% particle diameter D50 (HE) according to a dry laser diffraction particle size distribution analysis to the same particle diameter D50 (MT) according to a wet laser diffraction particle size distribution analysis is 0.7 or more, and a coverage ratio R defined by R=Si×100 / (Si+M) (wherein Si and M are molar fractions of Si and elements constituting the soft magnetic powder) is 70% or more is obtained by subjecting a slurry containing a soft magnetic powder containing 20 mass % or more of iron and a hydrolysate of a silicon alkoxide to a dispersion treatment when the surface of the soft magnetic powder is coated with the hydrolysate in a mixed solvent of water and an organic substance.

The invention belongs to the technical field of glass product processing, and particularly relates to a high-temperature-resistant scratch-resistant easy-to-clean glass product and a preparation method thereof. The glass product comprises a glass substrate and an easy-to-clean film layer attached to the glass substrate, the easy-to-clean film layer is formed by curing the following coating composition in percentage by mass: 30-40% of polysiloxane containing a coupling group; 20%-40% of D3F; 10%-20% of nano silicon dioxide filler; 0.01%-0.1% of a silicon alkoxide catalyst; and 10%-30% of an anhydrous diluting solvent. The easy-to-clean film layer of the glass product adopts a specific fluorosilicone material to replace a fluorocarbon material, so that the high-temperature-resistant durability of the easy-to-clean film layer can be remarkably improved. By utilizing the coupling and cross-linking curing effects of the specific polysiloxane containing the coupling group, the glass substrate, the nano silicon dioxide filler and the fluorine-containing polysiloxane precursor, the high temperature resistance, scratch resistance, easiness in cleaning and durability of the glass product are remarkably improved.

To provide a method for efficiently producing insulating coated magnetic powder having an insulating coating with high coverage and thinness. [Solution] A method for producing insulating coated magnetic powder, comprising: a raw material preparation step of preparing a raw material solution containing magnetic powder, a nonionic dispersant, water, and alcohol; an ammonia addition step of adding ammonia to the raw material solution; and a film formation step of adding silicon alkoxide to the ammonia-containing raw material solution and then performing a stirring treatment to form an insulating film on the surface of the magnetic powder particles, wherein the nonionic dispersant is an ether compound having an ether bond and a number average molecular weight of 250,000 to 3,000,000, an ester compound having an ester bond and a number average molecular weight of 1,000 to 150,000, or a cyclic amide compound having a cyclic amide structure and a number average molecular weight of 8,000 to 1,000,000.

The invention relates to a fire-resistant material comprising an assembly of vitreous siliceous artificial mineral fibers impregnated with an aluminosilicate-based composition prepared by a sol-gel process comprising a mixture of silicon alkoxide and aluminum alkoxide in an aqueous solvent. This material is particularly effective for protecting heat-sensitive substrates against heat and / or fires with temperatures exceeding 1800 °C.

A polysilsesquioxane liquid precursor includes a copolymer of a trifunctional silicon alkoxide and a difunctional silicon alkoxide, and residual silanol group fraction fSiOH in the copolymer is 0.02 to 0.3. A method for producing a polysilsesquioxane liquid precursor includes subjecting a trifunctional silicon alkoxide and a difunctional silicon alkoxide to a hydrolysis reaction and a polycondensation reaction in an aqueous solution without using an organic solvent in the presence of an acid catalyst, with aging during the hydrolysis reaction and the polycondensation reaction.

Embodiments of the invention include topical compositions comprising silica fiber powder or dust and a topical carrier, for treatment of skin tissue. The silica fiber powder or dust may be generated from silica fiber mats that may be formed via electrospinning of a sol gel produced with a silicon alkoxide reagent, such as tetraethyl ortho silicate, alcohol solvent, and an acid catalyst.

Embodiments of the invention include articles incorporating fibrous fragments of mats of silica fibers and methods for producing such articles. The fiber mats may be formed via electrospinning of a sol gel produced with a silicon alkoxide reagent, such as tetraethyl ortho silicate, alcohol solvent, and an acid catalyst.

The invention provides a preparation method of tetraethoxysilane, which comprises the following steps: 1) carrying out a silanization reaction on a raw material system containing silicon powder, absolute ethyl alcohol and a catalyst to obtain a first material containing crude tetraethoxysilane, hydrogen and residual silicon powder; 2) carrying out ball milling treatment on a mixed system containing the residual silicon powder and a dehydrating agent to obtain a second material; (3) carrying out reduction treatment on the second material to obtain recycled silicon powder; and returning the recovered silicon powder to participate in the silanol salinization reaction. According to the preparation method of tetraethyl orthosilicate provided by the invention, the mixed system of the residual silicon powder and the dehydrating agent is subjected to ball-milling treatment, and the second material is subjected to reduction treatment, so that the recovered silicon powder can be returned to participate in the silanol salinization reaction, and the agglomeration phenomenon of the silicon powder in the reaction process is effectively prevented; the silicon powder conversion rate and the ethyl orthosilicate selectivity are improved.

A gas barrier laminate includes a gas barrier film having a gas barrier layer on at least one side of a substrate including a first polypropylene film, and at least one second polypropylene film laminated on the gas barrier film. The gas barrier layer is obtained using a composition for forming the gas barrier layer that contains a resin and a first silicon compound. The first silicon compound is at least one of a silicon alkoxide represented by a following general formula (1) and a hydrolysate thereof, and a chlorine content as measured by combustion ion chromatography is more than 0.0008% by mass and 0.0080% by mass or less relative to a total mass of the gas barrier laminate. Si(OR1)4 . . . (1) (In the above general formula (1), OR1 represents a hydrolyzable group.)

The present invention provides: a method for producing a thick polysilsesquioxane cured object that has high hardness and excellent transparency; a polysilsesquioxane liquid precursor for producing such a cured object; and a cured object. This polysilsesquioxane liquid precursor includes a copolymer of a trifunctional silicon alkoxide and a difunctional silicon alkoxide, the residual silanol fraction fSiOH of the copolymer being 0.02–0.3.