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10013 results about "Nano silicon dioxide" patented technology

Silicon dioxide nano particles are known as Nano Silica, it is also called Silica nano-particles. It is used particularly in the Biomedical researches.

Preparation method for super-hydrophobic silica particle and super-hydrophobic coating

The invention provides a preparation method for super-hydrophobic silica particles and super-hydrophobic coatings. The method includes the following steps that in step S1, nanometer silica particles and silane modifiers are dispersed in a solvent to form a mixed solution, wherein weight ratio for nanometer silica particles and silane modifiers and the solvent is 1:0.05-0.5:3-20; the PH value of the mixed solution is adjusted to 2.0-5.0 by hydrochloric acid, and then the mixed solution is stirred for 2 to 24 hours at the temperature from 0 DEG C to 50 DEG C; the PH value of the mixed solution is adjusted to 6.0-7.5 by ammonia water, and then the mixed solution is stirred for 0.5 to 3 hours; a dispersion solution of modified nanometer silica particles is achieved; in step S2 the dispersion solution is dispersed into droplets by an ultrasonic nebulization technology and is dried at the temperature from 80 DEG C to 120 DEG C; the super-hydrophobic silica particles are achieved. With the preparation method for super-hydrophobic silica particles and super-hydrophobic coatings, the super-hydrophobic silica particles and the super-hydrophobic coatings are achieved, and have the advantages of being good in super-hydrophobic effect and simple in manufacturing process.
Owner:THE HONG KONG POLYTECHNIC UNIV

Preparation method capable of realizing chemical blending of modified nano silicon dioxide particles in acrylate monomer

A preparation method capable of realizing chemical blending of modified nano silicon dioxide particles in an acrylate monomer relates to the field of the application of uniform dispersity of acryloyl oxygen radical contained silane couplint agent modified nano silicon dioxide particles in the acrylate monomer and the application of photocuring products in coating material. According to the method, the modified silicon dioxide is formed in a way that alkoxy on silane couplint agent and hydroxy on the surfaces of the nano silicon dioxide particles are reacted to form firm silicon-oxygen-silicon bonds; the double-bond silane couplint agent modified nano silicon dioxide is mixed in the monomer; during the photopolymerization process of the product, the acryloyl oxygen radical contained silane couplint agent modified nano silicon dioxide and the monomer are polymerized through the chemical bonds, so as to allow the nano silicon dioxide to be more uniformly distributed in the polymer; and the acryloyl oxygen radical contained silane couplint agent modified nano silicon dioxide particles are subjected to laser size analysis and transmission electron microscopy. The purpose of improving the application of the nano silicon dioxide composite acrylate monomer in the coating material field is achieved.
Owner:BEIJING UNIV OF CHEM TECH

Graphene-based nitrogen-doped hierachical-pore carbon nanosheet/sulfur composite material for cathode of lithium sulfur battery, as well as preparation method and application of graphene-based nitrogen-doped hierachical-pore carbon nanosheet/sulfur composite material

The invention discloses a graphene-based nitrogen-doped hierachical-pore carbon nanosheet / sulfur composite material for a cathode of a lithium sulfur battery, as well as a preparation method and application of the graphene-based nitrogen-doped hierachical-pore carbon nanosheet / sulfur composite material. The carbon nanosheet is a graphene-based nitrogen-doped hierachical-pore carbon nanosheet, and is prepared by the steps of growing poly-pyrrole on graphene oxide in situ, performing carbonization at high temperature, activating by using potassium hydroxide and forming pores, wherein the graphene oxide and nano-silicon dioxide serve as double templates; the thickness of the carbon nanosheet is 10 to 25 nm; the specific surface area is 800 to 1,600 m<2> / g; the pore diameter of the carbon nanosheet is distributed into the range of 0.8 to 6 nm in a concentrated way; the structure of the carbon nanosheet is a sandwich-like type which adopts graphene as the interlayer of the carbon nanosheet. The carbon nanosheet with abundant micro-pores, meso-pores and large specific surface area can load more sulfur active substances and can effectively inhibit dissolution of polysulfide. The ultrathin nanosheet, and the micro-pores and meso-pores guarantee diffusion of electrolyte and transmission of ions. According to the structure, the capacity, the cycling stability, the coulombic efficiency and the rate performance of the carbon nanosheet / sulfur composition material applied to the lithium sulfur battery are improved synergistically.
Owner:WENZHOU UNIVERSITY

Anti-soiling aging-resisting stainless steel paint and preparation method thereof

The invention relates to anti-pollution anti-aging rustless steel coating material and a process for preparation, and coating material comprises acroleic acid resin, film forming matter, filling material, dissolvent and auxiliary agent which are mixed, the film forming matter comprises fluoro containing resin, water-based polyurethane and epoxide resin, the filling material comprises nanometer silicon oxide. The process comprises dissolving acroleic acid resin in dissolvent, further adding film forming matter, filling material, and auxiliary agent, balling to evenly mix. The rustless steel coating material of the invention adopts nanometer silicon oxide and fluoro containing resin to modify acroleic acid coating material, utilizes the ultraviolet screening performance of nanometer silicon oxide, the particle diameter of nanometer-grade particle and low surface tension of fluoro containing resin to lead the anti-aging capability and anti-ultraviolet performance of acroleic acid resin which is prepared to be greatly enhanced, the invention has longer life span than the existing normal acroleic acid resin coating material, which has better fingerprint resisting effect, and the quality and the level are greatly improved, the scope of application is further enlarged.
Owner:HAIMEN SENDA DECORATION MATERIAL CO LTD +1

Nanosilicon dioxide modified polyurethane elastomer and preparation method thereof

The invention discloses a nanosilicon dioxide modified polyurethane elastomer and a preparation method thereof. The preparation method comprises the steps of enabling polyether glycol, isocyanate and micromolecular dihydroxy alcohol to be subjected to addition polymerization reaction to prepare a polyurethane prepolymer as a component A; uniformly mixing a chain extender, ethyl silicate and a silane coupling agent, carrying out in-situ hydrolysis on ethyl silicate to form nanosilicon dioxide particles, performing surface hydrophobicity modification on the nanosilicon dioxide particles by using the silane coupling agent, and removing a solvent in the mixture to obtain a component B; uniformly mixing the component A and the component B according to a certain ratio, degassing, pouring and carrying out vulcanization molding to obtain the nano-modified polyurethane elastomer. By using the preparation method, the uniform dispersion of silicon dioxide particles in polyurethane is realized, the enhancement effect of nanoparticles is sufficiently taken, the prepared polyurethane elastomer is obtained by crosslinking the nanosilicon dioxide particles, and the heat resistance and chemical stability of the polyurethane elastomer can be remarkably improved; in addition, the nanosilicon dioxide modified polyurethane elastomer can meet the requirements of a sealing element for mechanical strength, wear resistance, high elasticity and oil resistance and has a wide market prospect.
Owner:安徽嘉明新材料科技有限公司

Magnetic nanometer ion liquid composite particles as well as preparation method and application thereof

The invention discloses magnetic nanometer ion liquid composite particles as well as a preparation method and application of the magnetic nanometer ion liquid composite particles in removing pollutants in water bodies. The preparation method of the magnetic nanometer ion liquid composite particle comprises the following steps of: firstly synthesizing ferric oleate into magnetic Fe3O4 nanometer particles by taking ferric oleate as an iron source and adopting a chemical precipitation method; preparing nanometer nuclear shell type magnetic silicon dioxide with surface amino-functionalization by utilizing the nanometer magnetic particles as a kern, taking ethyl orthosilicate and a silane coupling agent as silicon sources, and utilizing a colloidal sol-gel method; and synthesizing a functionalized ion liquid by utilizing reaction between N, N-carbonyldimidazole (CDI) and an ion liquid containing carboxyl, and thus preparing the magnetic nanometer ion liquid composite particle by utilizing reaction between the functionalized ion liquid and amino on the surface of the magnetic nanometer silicon dioxide; and the method is used for removing pollutants in the water bodies. The method provided by the invention has the advantages that the operation is simple and convenient, the cost is low, the treatment process is simple, and the removal efficiency is high.
Owner:SOUTH CHINA UNIV OF TECH

Transparent super-hydrophobicity wood coating and preparation method thereof

The invention discloses a transparent super-hydrophobicity wood coating which comprises the following components in parts by weight: 20-50 parts of water dispersive polyurethane resin or water dispersive alkyd resin, 4.5-25 parts of nano silica sol, 3-16 parts of nano cellulose gel, 0.1-1 part of octadecyl trichlorosilane or tetrahydroperfluorodecyltrichlorosilane or stearic acid and 0-45 parts of nano talc powder or nano calcium carbonate. A preparation method of the transparent super-hydrophobicity wood coating comprises the following steps: adding matrix resin and filler into a stirring kettle, and stirring uniformly to obtain slurry; grinding the slurry with a sand mill; adding a low-surface energy substance and supported nano silica sol; performing ultrasonic sufficient mixing for 30 minutes to obtain the transparent super-hydrophobicity coating. The transparent super-hydrophobicity wood coating disclosed by the invention has the advantages of low cost, controllable process, adjustable size and good applicability and is suitable for a preparation method of large-area preparation of transparent super-hydrophobicity surface; the prepared super-hydrophobicity film has good self-cleaning property, antifouling property, hydrophobic property, oleophobic property and the like.
Owner:GUANGDONG YIHUA TIMBER IND +1
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