121 results about "Amorphous silicon dioxide" patented technology

Chemical test methods for evaluating the alkali-silica reactivity (ASR) of an aggregate or an aggregate within a particular concrete job mix design by exposing the aggregate to a simplified system with the same or simulated long-term pore solution conditions is provided. ASR is a chemical reaction occurring between alkaline hydroxides within cement paste and certain types of amorphous silica found in mineral aggregates. Causing an accumulation of internal pressure within concrete structures due to the formation of a hygroscopic gel through the absorption of water, ASR leads to expansion and cracking of concrete. The present test method determines the reactivity index (RI) of a given aggregate, or an aggregate as it is to be used in a proposed concrete job mix design by determining the average concentrations of calcium, aluminum, and silicon across multiple tested samples, wherein the RI is the ratio of the concentrations of silicon to that of aluminum and calcium combined.

A fire-resistant, cellulose-based composition of matter is provided that can be used in a variety of applications that benefit from added fire resistance. In at least one aspect, the composition of matter includes, by mass: 10 to 70% cellulose; 1 to 15% insulating compound; and 5 to 30% insulative particles. The composition of matter may further include one or more of, by mass: 1 to 15% phosphate additive, 5 to 30% phosphate filler, 3 to 30% water-based binder, or 1 to 20% silica. The insulating compound of the composition of matter may include, by mass: 2 to 60% insulative particles, 5 to 40% silica, and 15 to 50% amorphous silica. Other aspects are described herein.

The invention relates to a novel phosphorus-fluorine curing agent for phosphogypsum and a preparation method thereof, and belongs to the technical field of industrial solid waste treatment and resource utilization. The curing agent comprises superfine slag powder, anhydrous sodium sulfate, water glass, water, sodium hydroxide and a Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer. The Fe3O4 (at) SiO2 (at) Zr-Al bimetallic oxide stabilizer is of a core-shell structure, magnetic ferroferric oxide particles serve as a core, and the surfaces of the magnetic ferroferric oxide particles are sequentially coated with an amorphous silicon dioxide protection layer and an active layer. And the active layer is an amorphous and porous zirconium-aluminum bimetallic oxide with a network structure. The preparation method of the curing agent is simple, mild in condition and easy for industrial production, the main raw material is the industrial solid waste slag, the effect of treating waste with waste is achieved, the agent addition amount is small, and the comprehensive treatment cost is low.

The invention relates to an anti-aging MPP (modified polypropylene) single-wall corrugated pipe and a preparation method thereof, and belongs to the technical field of high polymer materials, and the anti-aging MPP single-wall corrugated pipe is prepared from the following raw materials: polypropylene resin, modified nano titanium dioxide, a toughening agent, a defoaming agent, talcum powder and a microencapsulation antioxidant. Wherein the modified nano titanium dioxide is prepared by coating the surface of the nano titanium dioxide with an amorphous silicon dioxide layer and synchronously doping zinc oxide quantum dots, and after the modified nano titanium dioxide is added, the resistance effect of the corrugated pipe on ultraviolet radiation can be remarkably enhanced, aging is delayed, and the physical property stability is improved. The microencapsulated antioxidant is formed by wrapping an antioxidant 1010 with a polyurea formaldehyde shell layer, and the shell layer contains amino groups, so that the antioxidant can be slowly released to inhibit oxidation and aging, the compatibility and stability of the material can be enhanced, the comprehensive performance of the corrugated pipe is finally effectively improved, and the service life of the corrugated pipe is prolonged.

The application discloses an amorphous silicon dioxide coating prepared based on micro-arc oxidation, a preparation method and application thereof, and belongs to the technical field of metal surface protection and silicon dioxide coating. In the application, a magnesium alloy, an aluminum alloy, a titanium alloy, a titanium-aluminum base and a nickel-aluminum base are used as anodes and are placed in a micro-arc oxidation tank, a hydrolytic solution of organic silicon is used as an electrolyte, and an amorphous silicon dioxide coating with a thickness of more than 100 mu m can be prepared within 20 minutes through a step-by-step step-incremental constant potential control means. The application utilizes the advantages of the micro-arc oxidation process and the sol-gel process, avoids their shortcomings, and realizes the superimposed synergistic effect of "1+1>2". The process steps of the application are simple, and the application is very suitable for full-automatic operation and processing in industry. The amorphous silicon dioxide coating with the required thickness, wear resistance, corrosion resistance, erosion resistance, oxidation resistance and other characteristics can be prepared by changing the electrolyte concentration, the micro-arc oxidation time and the electric control parameters, or through the conventional micro-arc oxidation constant voltage and constant current control means.

The invention relates to the technical field of preparation of novel bio-based materials, in particular to a preparation method for producing a rice hull-based high-purity high-modulus sodium silicate solution by taking rice hulls as raw materials. Rural solid waste rice hulls / grass are used as raw materials, combustion is carried out at the fixed low temperature of 700-750 DEG C, generated steam is used for supplying heat to the production or the park, and the combusted rice hull ash contains amorphous silicon dioxide gt; 90%; the method comprises the following steps: activating rice hull ash just out of a chamber and diluted hydrochloric acid (5-10%) to generate polyhydroxy surface modified silicon dioxide active seeds; the method comprises the following steps: dynamically mixing rice hull ash and a 25% NaOH solution according to a molar ratio of (3.25-4): 2, adding 3-7% of active seeds in batches at 105 + / -5 DEG C, and reacting for more than or equal to 3 hours; the high-purity sodium silicate solution with the modulus of 3.25-4.0 is finally obtained through pH segmented regulation (Mg < 2 + > is removed at the pH of gt and 12, and Ca < 2 + > is removed at the pH of 9.5-10) in combination with high-pressure refined filtration; the product is mainly used for preparing nano silicon dioxide, especially for preparing 5nm silicon dioxide dispersion liquid and high-purity electronic grade silicon dioxide as raw materials.

A method of catalytic hydrocracking. The method includes flowing a hydrocarbon feed comprising a heavy oil into a hydrocracking unit; and hydrocracking the hydrocarbon feed in the hydrocracking unit using a composite catalyst. The composite catalyst includes an ordered amorphous silica-alumina (OASA) having mesopores, a zeolite component having micropores, a first metal component, a second metal component, and a support material, where at least a fraction of the heavy oil is converted within the mesopores into an intermediate, and at least a fraction of the intermediate is further converted within the micropores to form a product stream including a middle distillate fraction.

The invention discloses alkali-activated gypsum glass particle concrete and a preparation method thereof, and belongs to the technical field of building materials. The invention aims to solve the technical problems of poor interface cohesiveness and stockpiling pollution of industrial byproduct gypsum caused by the use of inert aggregate in traditional alkali-activated gypsum concrete. The concrete is prepared from the following raw materials in parts by weight: 10-15 parts of an alkali activator, 30-40 parts of dehydrated gypsum and 50-60 parts of tempered glass particles. In addition, the concrete further comprises a polycarboxylate superplasticizer and a protein gypsum retarder, and the addition amounts of the polycarboxylate superplasticizer and the protein gypsum retarder are respectively determined based on the total mass of the main body material and the mass of the dehydrated gypsum. The core of the invention is that the active aggregate formed by crushing the waste toughened glass is utilized, and amorphous silicon dioxide rich in the active aggregate can react in an alkali excitation environment to generate CSH gel, so that an interface transition region between the aggregate and a rubber material is remarkably reinforced, and the mechanical property of the concrete is improved. Meanwhile, industrial by-product gypsum such as ardealite and the like can be used, and high-added-value resource utilization of the solid waste is achieved.

A thermochromic material comprising vanadium dioxide (VO2) nanoparticles dispersed on surfaces of larger scaffolding particles such as amorphous silicon dioxide (SiO2). The SiO2 particles prevent the vanadium dioxide nanoparticles, which are typically less than approximately 40 nm in size, from sintering into larger particles, thus giving the material advantageous properties. A base added to the vanadium precursor solution functionalizes the scaffolding particles. The size of the vanadium dioxide nanoparticles can be changed by changing the size of the scaffolding particles. The material can be dispersed in a coating, film, ink, plastic, or polymer.

The invention relates to the technical field of rock mechanics tests, and discloses a multiphase transparent rock-soil body sample preparation method and a visual combined test system.The sample preparation method comprises the following steps that S1, fused quartz sand and transparent glass sand are mixed, cooled after being cleaned and subjected to heat preservation till solidification, and a transparent skeleton structure module is formed; s2, removing impurities from amorphous silicon dioxide formed by melting natural silica, washing with water, and mixing with an epoxy resin solution to form a transparent rock matrix module; s3, filling the transparent rock matrix module and the transparent skeleton structure module into a sample shaping mold, and uniformly mixing the transparent rock matrix module and the transparent skeleton structure module; s4, demoulding and naturally cooling; s5, absolute ethyl alcohol is used for cleaning, then drying is conducted, and the multiphase transparent rock-soil body sample is obtained. According to the invention, real-time visual monitoring of the target sample is realized, and acoustic-optical-thermal-electric combined monitoring of the target sample is realized through the four-dimensional combined test system.

To provide an amorphous silica-alumina capable of controlling a hydrocracking reaction of a long-chain paraffin to primary cracking with high efficiency and exhibiting high catalytic activity when containing an active metal element, and to provide a method for producing the same.SOLUTION: The amorphous silica-alumina has a ratio of the pore volume of pores having a diameter of 0-2 nm to the pore volume of pores having a diameter of 0-10 nm of ≥60% and a specific surface area of ≥280m2 / g.SELECTED DRAWING: None

The invention relates to the technical field of friction materials, and discloses a stable-size and anti-adhesion friction material for an electromagnetic brake and a preparation method of the friction material. The friction material comprises the following raw materials: benzoxazine, bismaleimide, cyanate resin, butyronitrile rubber powder, zinc fibers, modified bamboo fibers, ceramic fibers, silicon carbide whiskers, calcium sulfate whiskers, modified poly (p-phenylene benzobisoxazole) pulp, calcined kaolin, precipitated barium sulfate, magnesium oxide and cashew nut shell oil modified phenolic resin coated amorphous silicon dioxide. The invention also discloses a preparation method of the modified layered magnesium phosphate. The friction material disclosed by the invention has excellent dimensional stability under damp and hot conditions and can avoid rusting of mating plates, so that adhesion and corrosion are avoided.

The invention discloses a high-capacity sodium-ion battery layered oxide positive electrode material, and relates to the technical field of sodium-ion battery preparation, the high-capacity sodium-ion battery layered oxide positive electrode material is prepared by ball-milling a precursor and sodium carbonate and then roasting, amorphous silicon dioxide is formed by a polysiloxane main chain in a molecule during roasting, and the high-capacity sodium-ion battery layered oxide positive electrode material is obtained. Silicon dioxide can inhibit transition metal ions from being dissolved in electrolyte in the circulation process, so that capacity fading and negative electrode SEI film damage caused by dissolution of the transition metal ions are avoided, meanwhile, the silicon dioxide serves as a buffer matrix to absorb mechanical stress and prevent particles from being broken, the circulation stability of the material is remarkably improved, and the service life of the material is prolonged. The boron element and part of the silicon element on the main chain form a boron-silicon oxide which can expand the sodium layer and the transition metal layer and broaden the diffusion channel of sodium ions, so that the ion migration energy barrier is reduced, the rate capability is improved, the transition metal ions can be prevented from being migrated to the sodium layer, and the mixed arrangement of cations is reduced.

The present invention relates to process for producing a hot blended material of amorphous silicon dioxide - crystalline silicon dioxide (Hot Blending silica - PheniSilic™) from materials containing silicon dioxide such as sand, cristobalite, crushed glass, waste rock powder / burrs from process of producing artificial stone, waste products and by-products from the exploitation and processing of natural quartz stone. The present invention also relates to artificial stone product produced by using base resins such as unsaturated polyester, epoxy, acrylic or combination thereof and reinforcement is the hot blended material of amorphous silicon dioxide - crystalline silicon dioxide wherein the artificial stone has a flexural strength > 40N / mm2, a water absorption ≤ 0.05%, an impact resistance ≥ 3J, as well as process for producing this artificial stone.

The application discloses microcrystalline quartz ceramic and a preparation method and application thereof, relates to the technical field of quartz ceramic, and comprises the following steps: (1) adding nanoscale amorphous silicon dioxide and a nucleating agent into water to prepare a slurry; (2) spray drying the slurry to obtain nanoscale silicon dioxide agglomerates; (3) mechanically and statically pressing the nanoscale silicon dioxide agglomerates to obtain a silicon dioxide green body; and (4) performing microcrystallization treatment on the silicon dioxide green body to obtain the microcrystalline quartz ceramic. The microcrystalline quartz ceramic prepared by the application has good high-temperature resistance, high bending strength and a transparent appearance, and can greatly expand the application range of quartz ceramic.

A fire-resistant, cellulose-based composition of matter is provided that can be used in a variety of applications that benefit from added fire resistance. In at least one aspect, the composition of matter includes, by mass: 10 to 70% cellulose; 1 to 15% insulating compound; and 5 to 30% insulative particles. The composition of matter may further include one or more of, by mass: 1 to 15% phosphate additive, 5 to 30% phosphate filler, 3 to 30% water-based binder, or 1 to 20% silica. The insulating compound of the composition of matter may include, by mass: 2 to 60% insulative particles, 5 to 40% silica, and 15 to 50% amorphous silica. Other aspects are described herein.

The invention relates to a process for preparing an aged building material from a process for additively manufacturing a three-dimensional object, wherein the preparation process comprises: mixing i) an aged building material from a process for additively manufacturing a three-dimensional object, wherein: the process for additively manufacturing a three-dimensional object comprises providing a building material layer by layer and selectively solidifying the building material layer by layer by the action of electromagnetic radiation, emitted by a radiation source, at positions in each layer that correspond to the cross section of the object in this layer; and the non-solidified building material is detached and forms the aged building material, and ii) a fresh building material for additively manufacturing a three-dimensional object, wherein: a prepared building material for additively manufacturing a three-dimensional object is formed; the aged building material and the fresh building material each contain a polymer and at least the fresh building material contains an amorphous silicon dioxide; and the ratio based on percent by weight of aged building material to fresh building material is greater than 60:40.

The invention relates to the technical field of papermaking, in particular to a preparation method of ultrathin high-strength paper-based adhesive tape base paper. The preparation method comprises the following steps: mixing softwood pulp and hardwood pulp, forming base paper by adopting a double-net dehydration process, and forming a covalent cross-linked network in a paper sheet by adopting a cellulose reactive coupling agent with an o-benzoquinone structure and a multi-sulfydryl compound based on a sulfydryl-benzoquinone click chemistry and interface supramolecular assembly multi-bonding enhancement system; meanwhile, a dual intelligent enhancement system based on a biomacromolecule self-assembly body and a dynamic metal coordination network is established, and dynamic reversible crosslinking is constructed through a polyelectrolyte compound and a Fe < 3 + >-tannic acid coordination network; a multifunctional surface treatment technology combining a zwitterionic polymer brush and bionic in-situ mineralization is developed, a sulphobetaine methacrylate polymer brush grows through a surface-initiated atom transfer radical polymerization method, amorphous silicon dioxide is induced to be mineralized, and the adhesive tape body paper prepared through the method is high in strength.

A method for separating a fluorocarbon gas including feeding a mixed gas that includes two or more kinds of fluorocarbon gases having different molecular diameters from each other to a porous membrane and separating a gas composition in which a mixing ratio of one kind of a fluorocarbon gas selected from the two or more kinds of fluorocarbon gases is increased or a single gas, where the porous membrane includes amorphous silica formed by a sol-gel method.

The invention discloses a preparation method of amorphous silicon dioxide with a controllable structure and morphology and a carbonization method. The method comprises the following steps: reacting carbon dioxide and a NaHCO3 solution with low-concentration water glass at normal pressure to generate a silicon dioxide core, controlling a cationic chemical environment in a growth environment, performing secondary induced growth, controlling a gas-liquid flow field in a kettle through a self-suction gas redistributor under high pressure, controlling the temperature to be 80-150 DEG C, continuing carbonization until the pH value of a reaction system is reduced to 9.0 or below, and performing vacuum drying, thereby obtaining the carbon dioxide / NaHCO3 composite material. Amorphous silicon dioxide with a specific structure is formed through nucleus-induced growth under the condition, and the amorphous silicon dioxide functional powder with adjustable specific surface area and pore volume is obtained after solid-liquid separation, washing and drying. The morphology and the pore structure of the amorphous silicon dioxide can be adjusted under the condition of no additive, the problem of sodium sulfate wastewater discharge caused by introduction of a structure regulation additive in the traditional sulfuric acid method amorphous silicon dioxide production process is avoided, and meanwhile, the particle size distribution and the powder structure morphology of the silicon dioxide powder are improved.

The invention provides a low-permeability complex porous medium molecular modeling method which comprises the following steps: performing three-dimensional space expansion on a silicon dioxide crystal based on a selected CLAYFF force field to obtain a superunit cell with a preset size; carrying out simulated annealing on the super-unit cell according to a preset heating parameter and a preset cooling parameter to obtain amorphous silicon dioxide; carrying out three-dimensional space stretching expansion on the amorphous silicon dioxide system according to the total porosity to obtain a porous medium model; obtaining the number of hydroxyl groups needing to be added according to the pore surface area of the porous medium model, and adding the hydroxyl groups to silicon atoms of the porous medium model for surface end capping to obtain a first porous medium model; the second porous medium model is used for carrying out quantity adjustment and / or replacement of hydrophilic hydroxyl groups / hydrophobic methyl groups on the first porous medium model and is adjustable in hydrophilicity and hydrophobicity; and carrying out water molecule input or gas molecule injection on the second porous medium model to obtain a target porous medium molecular model.

A formulation, the formulation comprising a first population of sweetener particles, each individual sweetener particle comprising a sweetener particle comprising a caloric sweetener; and a plurality of amorphous silica particles disposed in each individual sweetener particle; wherein the average ratio of the number of the amorphous silica particles to the number of the sweetener particles is at least 2.5: 1, and wherein the first population of sweetener particles is lower in sweetness relative to a control sweetener that is identical to the first population of sweetener particles but is free of the plurality of amorphous silica particles, and wherein the second population of sweetener particles is lower in sweetness relative to a control sweetener that is identical to the first population of sweetener particles but is free of the plurality of amorphous silica particles. When the first population is diluted with sucrose to produce a standard formulation containing 0.1% amorphous silica, the standard formulation exhibits improved sweetness relative to a corresponding control sucrose formulation that is identical to the standard formulation but does not contain the plurality of amorphous silica particles.

The invention relates to the technical field of molding sand binders for casting, in particular to preparation and application of a water-resistant and moisture-resistant silicate inorganic binder, the binder is composed of a liquid component and a solid powdery reinforced modifier, based on the mass of sand, the adding amount of the liquid component is 2%, and the adding amount of the solid powdery reinforced modifier is 1%; the liquid component comprises liquid sodium silicate, a silane coupling agent and an organic silicon waterproof agent; the solid powdery reinforced modifier comprises amorphous silicon dioxide, metakaolin and fly ash; the hardening condition of the binder is that the binder is heated and hardened at 150-200 DEG C. According to the invention, geopolymers such as metakaolin and the like are introduced into a solid powdery reinforced modifier, and a three-dimensional network structure is formed by a silica tetrahedron and an alumina tetrahedron, so that water resistance and moisture resistance are realized through an alkali excitation reaction; and meanwhile, silane and an organic silicon waterproof agent are combined to form a synergistic waterproof effect, so that the prepared sand core does not bleed in water and does not fall apart after being soaked in water for several days.

The invention discloses black spherical silicon as well as a preparation method and application thereof, and relates to the technical field of copper-clad plates. The black spherical silicon provided by the embodiment of the invention has a core-shell structure, a shell layer is a silicon dioxide layer, a core layer is an amorphous silicon dioxide composite material, and the black spherical silicon can give consideration to dielectric loss and peel strength by regulating and controlling the content of surface active groups under unit mass to meet a specific range; and the thickness of the silicon dioxide of the shell layer accounts for 0.4-12% of the overall size, so that the absorption capacity of the powder to ultraviolet light is controlled, the reflective rate R is less than or equal to 10%, and the withstand voltage is greater than or equal to 5KV. The black spherical silicon provided by the invention has the characteristics of low dielectric loss and low reflective rate, and can reduce dielectric loss, reduce signal attenuation and improve stability after being used for a copper-clad plate.

The present application relates to a kind of tetrahydrofurfuryl alcohol preparation method, which includes the following steps: in the presence of catalyst, furfural and hydrogen are contacted and reacted;The catalyst includes the composite of nickel and silicon dioxide, wherein, nickel is crystal structure, and silicon dioxide is amorphous structure.The present application uses the composite of crystalline nickel and amorphous silicon dioxide as catalyst to catalyze furfural hydrogenation, so that the whole reaction process has less side reaction, and conversion and yield are relatively high, can realize tetrahydrofurfuryl alcohol stable, continuous and efficient production, and has important significance to bio-chemical industry, medicine and health and other fields.

Provided herein are methods, systems, and compositions for degrading minerals. The methods, systems, and compositions provided herein involve the use of enzymes having silicase activity and an increased ability to degrade minerals such as silicate materials. The methods, systems, and compositions provided herein may be used to release metal from the amorphous silica. The methods, systems, and compositions provided herein may further involve collecting, extracting, and / or purifying the metal released from the minerals.

The invention discloses a nano-diamond polishing solution which is prepared from the following raw materials in parts by weight: 5-10 parts of modified diamond micro powder, 80-100 parts of water, 0.5-2 parts of a photocatalyst, 0.5-1 part of an oxidizing agent and 0.5-1 part of a dispersing agent, and the pH of the polishing solution is adjusted to be 8 by using a pH regulator, wherein the modified diamond micro-powder is diamond micro-powder treated by a silane coupling agent, and the silane coupling agent is tetraethoxysilane. The modified diamond micro-powder adopted by the invention is the diamond micro-powder treated by a silane coupling agent, and the silane coupling agent is tetraethoxysilane, so that the nano-diamond micro-powder is subjected to modification treatment by adopting tetraethoxysilane; the surface of the nano-diamond micro powder is covered with a layer of continuous and compact nano amorphous silicon dioxide film containing active oxygen groups, so that aggregation of nano-diamond particles is prevented, the dispersity and suspension stability of the nano-diamond particles are improved, the overall performance of the polishing solution is improved, and the surface quality of a workpiece is guaranteed.

In order to achieve a production method for producing amorphous silica particles having a silica purity equal to or higher than that of the prior art in such a manner that the particle diameter is adjustable, a method for producing amorphous silica particles according to an aspect of the present disclosure comprises: a hot water treatment step for subjecting a plant-derived substrate to a hot water treatment; and a firing step for firing residues of the substrate obtained in the hot water treatment step.

What is described is a process for producing an article for use in the foundry industry selected from molds, cores, feeder elements and molding material mixtures, and includes the following steps: (S1) producing or providing a binder system with the following components in three spatially separate vessels: a component (A) particulate amorphous silicon dioxide, a first liquid component (B) waterglass, and a second liquid component (C) aluminate ions dissolved in an aqueous phase, (S2) contacting a mold base material (D) and constituents of all the components (A), (B) and (C) of the binder system in predetermined ratios in one or more steps, so as to result in a molding material mixture in which the aluminate ions and the particulate amorphous silicon dioxide are mixed wholly or partly into the waterglass, wherein steps (S1) and (S2) are conducted in a facility for producing molding material mixtures. Also described are a corresponding molding material mixture and apparatuses and uses.

An adhesive includes a styrenic block copolymer having a styrenic block and a conjugated diene block that is hydrogenated or not hydrogenated, a tackifying resin, and at least one of precipitated amorphous silica or a precipitated amorphous silicate. The adhesive can further include at least one of a plasticizer or a second tackifying resin having a glass transition temperature lower than the first tackifying resin. The precipitated amorphous silica or precipitated amorphous silicate may be surface modified with hydrophobic groups. The adhesive can further include natural rubber. The adhesive may have not more than 4.5 weight percent polyisobutylene or a polyisobutylene copolymer, based on the total weight of the adhesive, or may be free of polyisobutylene and a polyisobutylene copolymer. A tape includes the adhesive disposed on a backing. Processes for making and using the tape are also provided.