641 results about "Silica particle" patented technology

Cerium oxide (CeO2) coated silica (SiO2) particles, optionally comprising the inorganic group-SO2X, and methods of making such particles. The addition of the cerium oxide (CeO2) coated silica (SiO2) particles to fluorinated polymers containing sulfonic acid functional groups increases their stability to free radical degradation when used in fuel cell applications or electrolytic applications.

To provide an organosilica sol in which hollow silica particles containing aluminum atoms are dispersed in a polymer, especially an organosilica sol formed by dispersing the hollow silica particles in a polymer having a rotaxane structure.SOLUTION: There are provided a hollow silica organosol containing components (A), (B), and (C), wherein the organosol contains component (C) in an amount of 0.001 mass% or more and 90 mass% or less based on the total amount of the organosol (100 mass%), and a method for producing the same. (A) Component: a hollow silica particle containing aluminum atoms, wherein the amount of aluminum atoms present throughout the hollow silica particle is 120 to 50,000 ppm / SiO2 per gram of the hollow silica particle, calculated as Al2O3. (B) Component: a polymer with a molecular weight of 1000 or more, containing ester, ether, or hydroxy group, and additionally possessing an acrylic structure. (C) Component: Organic solvent.SELECTED DRAWING: None

The present application provides a heat exchanger and a manufacturing method of a heat exchanger. The heat exchanger includes a metal substrate, the metal substrate has a fluid channel for circulating a heat exchange medium; and the heat exchanger further includes a coating, the coating includes resin, silica and titanium dioxide, and the coating is arranged to cover at least part of a surface of the metal substrate. Silica particles and titanium dioxide particles are conducive to the formation of a complex micro-nano structure, and leveling and stability of hydrophilic resin contribute to long-term maintenance of the micro-nano structure. The coating of the heat exchanger according to the present application has excellent hydrophilic durability.

The invention discloses an environment-friendly anti-icing and deicing coating as well as a preparation method and application thereof, and aims to solve the problems of low efficiency, high corrosivity, serious environmental pollution and the like in the traditional anti-icing and deicing technology. The coating material is prepared from the following components: deionized water, polyvinylpyrrolidone, propylene glycol, glycerol, fumed silica, granular silica, ethanol, potassium acetate and a waterborne polyurethane coating. The invention further provides a preparation method of the coating material, and the coating material is applied to anti-icing of metal and plastic substrates and has dual functions of preventing icing and rapidly removing ice. The coating has the advantages of being good in durability, environmentally friendly, free of corrosion to base materials and the like, is particularly suitable for anti-icing protection of equipment such as rails, wind power blades and cables, remarkably improves the operation and maintenance efficiency of key facilities and equipment, reduces the maintenance cost and has important economic and social benefits.

The invention relates to the technical field of reinforced concrete, in particular to a preparation technology of a reinforced concrete telegraph pole, the performance of the concrete telegraph pole is improved through a multi-scale fiber synergistic toughening method, when the telegraph pole bears a bending load, steel fibers firstly play a role to restrain large cracks, and when micro cracks appear, the steel fibers play a role to restrain the large cracks. The denser composite fiber network bears stress to realize multi-stage crack resistance, which is combined with the high early strength characteristic of the sulphoaluminate cement, so that the telegraph pole has excellent impact resistance and fatigue resistance while obtaining extremely high early strength; the surface of the aggregate modified by the silicon dioxide aerogel is covered with a high-activity and high-specific-surface-area nano silicon dioxide layer, and in an alkali-rich and calcium-rich environment provided by sulfo-aluminate water cement hydration, the nano silicon dioxide and a cement hydration product are subjected to a violent pozzolanic reaction, so that the surface of the aggregate is modified by the sulfo-aluminate water cement; therefore, the compressive strength and the flexural tensile strength of the concrete are remarkably improved.

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)

The invention relates to an aperture-adjustable porous carbon material and a preparation method and application thereof. The preparation method comprises the following steps: adding an alkali solution into a phenol source, stirring, heating to 60-90 DEG C, adding an aldehyde source solution, stirring, cooling to room temperature, and adding an acid solution to adjust the mixed solution to be neutral, so as to obtain a phenolic resin oligomer solution; evaporating water, and adding low-carbon alcohol to prepare a phenolic aldehyde low-carbon alcohol solution; preparing silicon dioxide sol, wherein the particle size of silicon dioxide particles is controlled by adjusting the pH value; the preparation method comprises the following steps: mixing and stirring a phenolic low-carbon alcohol solution and silicon dioxide sol at 35-45 DEG C, washing, filtering and drying to obtain a silicon dioxide-phenolic resin composite carbon source; carrying out carbonization treatment on the silicon dioxide-phenolic resin composite carbon source to obtain a carbonized product with a carbon skeleton and an S O < 2 > template; and carrying out wet etching treatment on the carbonized product, selectively etching the S < O2 > template so as to form holes in positions occupied by S < O2 > particles, and then washing, filtering and drying to obtain the porous carbon material with the adjustable aperture.

The invention belongs to the technical field of super-hydrophobic materials, and particularly relates to a heat-conducting super-hydrophobic anti-icing material as well as a preparation method and application thereof. The heat-conducting super-hydrophobic anti-icing material comprises a heat-conducting polymer substrate which is composed of resin and a heat-conducting filler modified by a silane coupling agent; the mass ratio of the resin to the heat-conducting filler is (1.5-4.0): 1; the super-hydrophobic particle layer is formed on the surface of the heat-conducting polymer substrate and comprises silicon dioxide particles modified by a low-surface-energy modifier; the mass ratio of the silicon dioxide particles to the low surface energy modifier is (7-8): 1; wherein the particle size of the heat conducting filler is 10 [mu] m-50 [mu] m, and the particle size of the silicon dioxide particles is 10 nm-20 nm; the heat-conducting polymer substrate and the super-hydrophobic particle layer jointly form a micron-nano double coarse structure.

The invention discloses a preparation method of an environment-friendly photo-thermal super-hydrophobic coating and application of the environment-friendly photo-thermal super-hydrophobic coating on a road, and aims to solve the problems that the deicing and anti-icing effects of an existing photo-thermal super-hydrophobic coating are limited, and fluorine-containing low-surface-energy components are mostly adopted and are difficult to degrade. The preparation method comprises the following steps: 1, dispersing epoxy resin, polydimethylsiloxane and a PDMS curing agent into absolute ethyl alcohol to obtain dispersion liquid; 2, adding nano silicon dioxide particles and a silane coupling agent into the dispersion liquid; 3, continuously adding hydroxylated multi-walled carbon nanotubes to obtain a dispersion liquid; 4, adding an epoxy resin curing agent; and 5, coating the pavement with the photo-thermal super-hydrophobic material dispersion liquid, and curing to obtain the photo-thermal super-hydrophobic coating. According to the invention, an epoxy resin and polydimethylsiloxane composite system is adopted as a matrix, excellent adhesive force and flexibility are taken into account, a stable bonding layer can be formed on a road base material, and long-term durability of the coating under the conditions of freeze-thaw cycle, vehicle friction and wind and rain erosion is ensured.

The present invention provides an active energy ray curable resin composition, cured product, laminate, and article that exhibits excellent adhesion to the substrate and excellent scratch resistance and coating hardness in the cured product. [Solution] An active energy ray curable resin composition comprising (meth)acryloyl group-containing silica particles (A), at least one compound (B) selected from the group consisting of polyfunctional (meth)acrylate, urethane (meth)acrylate, and acrylic (meth)acrylate, and a photopolymerization initiator (C), wherein the particle size of the (meth)acryloyl group-containing silica particles (A) at D10 is 7 to 43 nm, the hydroxyl value of the polyfunctional (meth)acrylate is 300 mg KOH / g or less, and the mass ratio of the (meth)acryloyl group-containing silica particles (A) to the compound (B) is 80 / 20 to 60 / 40.

There is provided a composition for a semiconductor process, the composition comprising silica particles, and the composition having a value of 6.30% to 9.60% according to Formula 1. Further, a composition for a semiconductor process is provided, the composition comprising silica particles, and having a value of greater than 5.80% and less than 8.80% according to Formula 2. Further, provided is a method for preparing a composition for a semiconductor process, the method comprising: a step (a) of stirring an aqueous dispersion solution of silica having a hydrogen ion concentration (pH) in the range of 4.0 to 5.5; a step (b) of introducing a silica surface modifier containing an aminosilane component when the temperature of the aqueous silica dispersion solution is 25 DEG C or more and less than 40 DEG C; (c) introducing a hydrogen ion concentration (pH) regulator into the aqueous silica dispersion solution into which the silica surface modifier has been introduced; and (d) stirring the aqueous silica dispersion solution into which the hydrogen ion concentration (pH) regulator has been introduced so that the final reaction temperature is within the range of 50 DEG C to 65 DEG C. Further, a method of manufacturing a semiconductor device using the composition for a semiconductor process is provided.

An electrophotographic belt is provided, which includes a base layer and a surface layer in direct contact with the base layer, wherein the surface layer includes heteroaggregates of a first particle and a second particle, the first particle is at least one selected from the group consisting of a hollow silica particle and a solid silica particle, and has a number-average particle diameter of primary particles, which is greater than 30 nm and less than 100 nm, the second particle contains a conductive metal oxide, and has a number-average particle diameter of primary particles, which is 5 nm to 40 nm, the surface layer has protruded portions derived from the heteroaggregates on an outer surface opposite to the surface facing the base layer, an arithmetic mean height (Sa) of the outer surface is 0.1 μm to 0.7 μm, and the base layer includes specific cation and anion.

A toner comprising a toner particle comprising a binder resin, a crystalline material, and a silica particle, wherein a number average particle diameter D1 of the silica particle comprised in the toner particle is 400 to 3000 nm; the silica particle has a pointed portion; and the crystalline material comprises a compound having an ester group.

The present disclosure pertains to composite particles with polymer-based cores, which eliminate the high pH failure mechanism of silica-based core-shell silica particles. In various embodiments, a non-porous polymer core is surface modified. In various embodiments, a non-porous hybrid organic-inorganic material is in contact with the modified surface of the core, and a porous inorganic material is in contact with the non-porous hybrid organic-inorganic material. The present disclosure pertains to chromatographic separation devices that comprise such composite particles.

The invention relates to the technical field of cigarette materials, in particular to a silica microsphere with a core-shell structure and hierarchical pores as well as a preparation method and application of the silica microsphere. The preparation method of the silicon dioxide microspheres with the core-shell structure and the hierarchical pores comprises the following steps: 1) mixing a polyvinyl alcohol aqueous solution with nano silicon dioxide particles, and stirring to form floccules; (2) preparing the floccule obtained in the step (1) into a sphere, namely a core structure of the silicon dioxide microsphere; (3) wrapping the surface of the core structure prepared in the step (2) with a pre-mixed mixture of mesoporous silica particles and a pore-foaming agent to serve as a shell structure of the silica microsphere, so as to obtain the silica microsphere with the core-shell structure; and 4) performing heat treatment to form hierarchical pores in the core-shell structure of the silicon dioxide microsphere, thereby obtaining the silicon dioxide microsphere with the core-shell structure and the hierarchical pores. The silicon dioxide microsphere with the core-shell structure and the hierarchical pores has the hierarchical pores with different sizes, so that the fragrance carrying amount can be increased, and the slow release performance can be improved.

The invention discloses a preparation method, and particularly relates to colored crystal mud and a preparation method thereof, and the colored crystal mud comprises the following basic components: 5-15 parts of cellulose ether; 1 to 3 parts of bentonite; 2-6 parts of a dispersant; 2-6 parts of a mildew inhibitor; 50 to 150 parts of calcium hydroxide; 20 to 70 parts of heavy calcium carbonate; 20 to 40 parts of redispersible latex powder; and 600 to 1000 parts of silicon dioxide particles. The product disclosed by the invention has the characteristics of high coating strength, high hardness and extremely durability, and meanwhile, the compactness and the wear resistance of the coating are further improved by virtue of the filling effect of the nano material. In addition, the added water repellent effectively endows the coating with excellent water resistance and impermeability, and overcomes the defect that similar materials are easy to damp.

The invention discloses a system and method for preparing high-purity silicon dioxide, and the system comprises a Venturi injection pump which is used for mixing silicon tetrafluoride gas with water to form jet flow; the swirler is connected with the venturi injection pump, and the swirler is connected with the venturi injection pump; the jet flow enters the swirler and then is subjected to separation treatment, and underflow and upper-layer overflow are formed; and the separation device is connected with the cyclone and is used for separating the silicon dioxide from the underflow and the upper overflow to obtain silicon dioxide particles. The method for preparing the high-purity silicon dioxide has the advantages of being simple in process, high in product purity, environmentally friendly, low in production cost, convenient for industrial production and the like, and has high economic benefits and social benefits.

The invention belongs to the technical field of circuit board materials, and discloses a glass fabric / resin composite dielectric substrate and a preparation method and application thereof, the glass fabric / resin composite dielectric substrate comprises a glass fabric base layer and a resin layer covering the surface of the glass fabric base layer; the resin layer is formed by a resin matrix and nanofiller dispersed in the resin matrix, and the nanofiller comprises modified silicon dioxide aggregates, modified silicon dioxide particles and hollow silicon dioxide microspheres which are sequentially distributed from inside to outside in the thickness direction of the resin layer. According to the glass fabric / resin composite dielectric substrate, the three-dimensional gradient distribution of the modified silicon dioxide aggregate, the particles and the hollow microspheres is constructed in the resin layer, so that the dielectric constant difference between the glass fabric and the resin is effectively offset, the dielectric uniformity is remarkably improved, and signal interference caused by dielectric mutation is avoided; and meanwhile, differential Skew and transmission line impedance fluctuation are greatly reduced, the integrity of high-speed signal transmission is guaranteed, and the scene requirements of ultra-high-speed communication and the like are met.

Disclosed are hardenable glass ionomer compositions including a first paste and a second paste, as well as methods of using the disclosed compositions. The first paste includes water, a polyacid, and a non-acid-reactive filler. The second paste includes water, an acid-reactive filler, and non-agglomerated, water-miscible nano-sized silica particles having at least 25% surface coverage of the particles with silane. The compositions are essentially resin-free. In some embodiments, the water content of the first paste and the second paste of the paste / paste GI compositions disclosed herein is less than 20% by weight, based on the total weight of the composition.

This invention provides a jacketed heat exchange device and a spheroidizing furnace for preparing silica powder. The jacketed heat exchange device includes a jacket body with a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange medium outlet is located at the upper part of the jacket body. An exhaust device is also provided at the upper part of the jacket body. The exhaust device includes an exhaust bend, one end of which is inserted into the jacket body and extends upward to the top surface of the internal cavity of the jacket body. The exhaust bend can fully exhaust the gas between the heat exchange medium outlet and the top surface of the jacket body, thereby improving the overall heat exchange effect of the jacketed heat exchange device and reducing safety hazards. The spheroidizing furnace equipped with this jacketed heat exchange device can precisely control the furnace temperature during silica powder preparation, reducing the problem of uneven silica particle formation caused by temperature fluctuations, significantly improving product quality consistency and production efficiency, reducing the defect rate, and increasing economic benefits.

This invention relates to the field of superhydrophobic functional coating materials. The invention discloses a carbon-coated nano-silica photothermal superhydrophobic coating and its preparation method. The preparation method includes: preparing carbon-coated nano-silica particles via a hydrothermal method; mixing the particles with an adhesive and PDMS and spraying the mixture onto a substrate surface, followed by a first curing to form a base coating; then immersing the mixture in a solution containing perfluoroalkyl silanes, followed by a second curing to obtain the final coating. The coating of this invention exhibits a water contact angle exceeding 150° and a roll-off angle less than 10°. Under 1 solar intensity, the surface temperature can rise to over 60°C within 6 minutes. It possesses advantages such as high-efficiency photothermal conversion, superhydrophobicity and oleophobicity, synergistic passive anti-icing and active de-icing, and good mechanical stability. Furthermore, the process is simple and scalable, making it suitable for anti-icing and de-icing protection in fields such as power facilities, wind power generation, and aerospace.

Provided are an active energy ray-curable resin composition, a cured product, a laminate, and an article which have excellent base material adhesion and excellent scratch resistance and coating film hardness in the cured product. An active energy ray-curable resin composition containing: (meth) acryloyl group-containing silica particles (A); at least one compound (B) selected from the group consisting of polyfunctional (meth) acrylates, urethane (meth) acrylates, and acrylic (meth) acrylates; and a photopolymerization initiator (C), the D10 particle size of the (meth) acryloyl group-containing silica particles (A) being 7-43 nm, the hydroxyl value of the polyfunctional (meth) acrylate being 300 mgKOH / g or less, and the mass ratio of the (meth) acryloyl group-containing silica particles (A) to the compound (B) being 80 / 20-60 / 40.

[Problem] To provide an insulating composition that contains hollow silica particles and can form a coating film with excellent mechanical characteristics, electrical characteristics (low relative permittivity, low dissipation factor, etc.), insulating properties, and the like, and to provide a base material comprising the coating film. [Solution] An insulating composition containing a resin and 5-70 vol% of hollow silica particles, wherein the hollow silica particles have a secondary particle median diameter (D50) of 0.2-10 μm and a specific gravity of at least 0.3 g / cm3 and less than 1.00 g / cm3, and the specific gravity of the hollow silica particles is less than the specific gravity of the resin.

The application discloses a method for preparing non-spherical nano-silica particles by self-assembly induction, which comprises synthesis of silica particle seeds and further growth of the seeds: by preparing monodispersed seed particles, trace amounts of amphoteric electrolytes are added into the seed growth solution to induce anisotropic growth of the seeds, the types and proportions of the electrolytes are adjusted to make the monodispersed seeds generate silica sol of non-spherical silica particles with different morphologies, and then a series of post-treatments such as water replacement solvent, filtration and concentration are conducted to obtain non-spherical ultra-high-purity silica sol with a mass fraction of more than 18%, a primary particle size of 40-80 nm and a morphology of peanut-shaped, short-chain-shaped and long-chain-shaped, etc. The application also relates to the non-spherical ultra-high-purity silica sol and application thereof in CMP. The preparation method of the application adopts a self-assembly mode of monodispersed seeds to prepare non-spherical particles, and the particle morphology can be further adjusted by adjusting the dosage or types of the self-assembly induction agent.

The invention provides a solvent-free organic-inorganic hybrid resin composition. The solvent-free organic-inorganic hybrid resin composition can provide a member having a high elastic modulus. The solvent-free organic-inorganic hybrid resin composition comprises the following components (A)-(C), and a resin film having self-supporting properties can be obtained after firing at 230 DEG C or lower. (A) silica particles having an average primary particle diameter of 15-100 nm and a sulfate ion content of 30 ppm or less, as calculated by formula 1 below, adhering to the silica particles; particle-attached sulfate ions (ppm) = combustion ion chromatography (ppm)-free ion chromatography (ppm) (formula 1); (B) an epoxy resin having two or more epoxy groups and having a number average molecular weight of 150-3000 (inclusive); and (C) a curing agent.

In one embodiment, a polishing liquid for magnetic disk substrates is provided that can reduce waviness on the surface of a magnetic disk substrate. [Solution] In one aspect, the present disclosure relates to a polishing liquid for magnetic disk substrates, which contains silica particles (component A) and an acid (component B), and in which the ammonia desorption maximum temperature of the silica particles measured by an ammonia temperature-programmed desorption method is 150°C or higher and 250°C or lower.

The application discloses a preparation method of silica with controllable particle size and morphology, and comprises the following steps: 1) mother liquor preparation: uniformly mixing an organic solvent, an alkali catalyst, an acid catalyst and water; 2) B liquid preparation: mixing alkoxy silane and the organic solvent, and stirring for a period of time; 3) particle nucleation: using a peristaltic pump to immerse a feed redistributor into the mother liquor, adding the B liquid into the mother liquor, and performing a silica particle nucleation reaction to obtain a seed solution; 4) particle regrowth: adding water and the alkali catalyst into the seed solution obtained in the step 3) and uniformly stirring; continuously adding the mixed solution of the alkoxy silane and the organic solvent into the seed solution by using the feed redistributor, and performing particle regrowth under stirring; 5) concentration and filtration: performing heating concentration on the sample, removing the organic solvent in the sample, and removing large particles in the sample by filtration. The application can finally control the particle size and morphology of the silica sol by effectively regulating the discharging mode and feeding position of the feed redistributor, and regulating the redistribution state of the feeding liquid in the mother liquor.

An artificial stone and a method of making the artificial are disclosed. The artificial stone comprises: 6 to 16 wt.% acrylic thermoset resin; and 84 to 94% fused silica particles, wherein at least 40 wt.% of the fused silica particles are characterized by a particle size larger than 100 pm.

This invention provides hollow silica particles with a hollow structure and a shell, a sphericity of not less than 99%, a particle hollowness of 20%-90%, and an arithmetic mean deviation of the shell surface profile (…). R a ) not greater than 25 nm, root mean square deviation ( R q The particle size is no greater than 30 nm. The hollow silica particles provided in this application have a smooth surface, high shell density, and good flowability, processing performance, dielectric loss, withstand voltage strength, and service life. This invention also provides composite powders and resin compositions comprising the above-mentioned hollow silica particles, as well as their applications and packaging methods.

The present disclosure is directed to stationary phase materials for performing size exclusion chromatography. Embodiments of the present disclosure feature hydroxy-terminated polyethylene glycol surface modified silica particle stationary phase materials, which are optionally also methoxy-terminated polyethylene glycol surface modified.