1816 results about "Nano sio2" patented technology

The invention relates to an auxiliary material for casting and moulding, in particular to a formula of alcohol group dry powder mold paint for sand mold casting. The dry powder mold paint comprises surface modifier, suspending agent, binder and refractory powder, wherein the surface modifier is 0.6-4.2wt% of refractory powder, the suspending agent is 4.0-8.0wt% of refractory powder and the binderis 4.0-6.2wt% of refractory powder. The alcohol group nanometer composite and surface modified dry powder mold paint of the invention adopts nanometer layered clay and nano-SiO2 to form composite suspending agent so that the controllability of operation technological parameters of the alcohol group dry powder mold paint is good and the process performance and operating performance of the obtainedpulp-type paint can both meet the demand of the casting factory.

A fluidized-bed catalyst for the ammoxidation reaction of olefin is composed of the carrier consisting of nano-SiO2 and silica sol, and the active component Mo(12-g)BiaFebNicXdZfOgOx, where X is chosen from Mg, Co, Ca, Be, Cu, Zn, Pb, Sb, Mn and Cr, Y is chosen from La, Ce and Sm, Z is chosen from Li, K, Rb, Na and Cs, Q is chosen from B, W, P and V, a=0.1-6, b=0.01-10, c=0.01-10, d=0.01-10, e=0.01-10, g=0-2 and f is more than (0-0.5).

The invention belongs to the fabric water-repellent finishing and processing field, in particular relates a super hydrophobic cotton fabric and a preparation method thereof. The preparation method of the super hydrophobic cotton fabric is characterized in that the epoxy-functionalized modification is performed to the cotton fiber of fabric, then aminated nano-SiO2 and epoxy-functionalized nano-SiO2 are used to impregnate the cotton fabric in turn so as to increase the surface roughness of the fabric, finally a low-surface-energy material is adopted to perform hydrophobization treatment to the fabric; the contact angle between the prepared cotton fabric and water drops is more than 150 degrees; the method utilizes the covalent reaction of epoxy groups of cotton fabric, amino groups of nano-SiO2 and epoxy groups of nano-SiO2 to ensure the built rough surface to have good fastness; and the built surface has a large number of Si-OHs and epoxy groups so as to facilitate the chemical combination of the low-surface-energy material and the surface, thus the superhydrophobic property of the prepared fabric has excellent stability.

A water nan-composite thermal-insulating coating for external wall and its production are disclosed. The coating consists of water, polymer emulsion, high-refractive index pigment, filler, nano-tin-antimony oxide slurry, nano-SiO2, wet dispersant, filming accessory, pH adjuster, thickener, de-foaming agent, anti-freezing agent and mildew-proof bactericide. It's cheap and simple, has excellent wash and weather resistances, better thermal-insulating performance, safe storage and no environmental pollution. It can be used for apparatus surface and architecture external wall.

The invention discloses a method for preparing amphiphilic nano silica powder and is used for preparing nano silica powder with about 90 degrees of a tri-phase contact angle. The method uses ultrasonic preparation, thus having short preparation process; the invention adopts liquid phase modification, thus avoiding processing means such as grinding, calcining and the like which are easy to cause the powder to generate hard particle agglomeration; the invention can prepare better amphiphilic surface (about 90 degrees of tri-phase contact angle) nano silica powder. The invention also discloses a method for preparing Pickering emulsion by using the amphiphilic nano silica powder under the action of ultrasound or cutting, the nano silica powder stably exists in oil-water interface, thus preventing diffused oil (water) droplets to re-agglomerate into big droplets to split phase and stabilizing emulsion. The prepared emulsion can be stored at room temperature without occurrence of demulsification in three months.

The invention relates to a honeycomb flue gas denitrification catalyst and a preparation method thereof, belonging to the technical field of inorganic new materials. The honeycomb flue gas denitrification catalyst is mainly prepared by carrying out extrusion molding and sintering on the following raw materials in parts by weight: 68-92.8 parts of nano TiO2, 3-10 parts of nano SiO2, 2-10 parts of glass fiber, 0.1-0.5 part of extrusion aid, 0.1-0.2 part of carboxymethyl cellulose, 0.1-0.3 part of polyoxyethylene and 0.1-0.2 part of sesbania powder. The preparation method comprises the following steps: (1) weighing the nano TiO2 and nano SiO2 powder, adding the extrusion aid, adding water while stirring to obtain paste, and adding ammonia water to regulate the pH value to 7-11; (2) adding the rest of raw materials, evenly mixing, and extruding with an extruding machine to obtain a honeycomb blank; (3) drying the blank at 30-70 DEG C under the relative humidity of 20-100% for 7-15 days; and (4) calcining the dried blank at 250-300 DEG C for 8-15 hours, calcining at 380-420 DEG C for 5-10 hours, and calcining at 580-620 DEG C for 8-12 hours to obtain the finished product.

The invention provides a high-rate charge-discharge lithium-ion battery and a preparation method thereof. The anode active material of the lithium-ion battery is lithium manganate; the cathode active material is selected from one or more of mesocarbon microbeads, artificial graphite or natural graphite coated by mesophase pitch; a conductive agent is selected from one or more of conductive graphite, conductive carbon black, nano Ag, nano SiO2 or nano Al2O3. The preparation method of the lithium-ion battery comprises the preparation of the anode plate, the parathion of the cathode plate and the assembly of the battery. The lithium-ion battery has the advantages of high-rate charge-discharge performance, long cycle life, high capacity, safe use, environmental protection, low cost and the like. The preparation method has the advantage of simple and easy process operation, and is applicable to the mass production.

The present invention belongs to the field of polymer material technology. Inorganic nano Sio2 partticle, organic olefin monomer and coupler as raw materials are subjected to emulsion polymerization or suspension polymerization in water as medium in the presence of various emulsifiers and initiator, so that the olefine polymer is grafted to the surface of inorganic nano SiO2 particle to form inorganic nano SiO2 particle core-organic olefin polymer shell structure. The composite particle is spherical, has homogeneous particle size smaller than 100 nm, and has high grafting rate and high grafting efficiency. The prepared compoisite olefin polymer/SiO2 particle material has wide application in the development of nano technology.

The invention discloses a nanometer silicon and carbon composite negative electrode material, a preparation method thereof and a lithium ion battery. The nanometer silicon and carbon composite negative electrode material is of a core-shell structure. A gap is formed between the outer wall of a core body and the inner wall of a shell layer, wherein the core body is made of nanometer silicon, and the shell layer is a nanometer porous carbon layer. The preparation method of the nanometer silicon and carbon composite negative electrode material comprises the steps of preparing nanometer silicon particles wrapped by SiO2; preparing nanometer silicon particles, wherein nanometer SiO2 is embedded into the nanometer silicon particles which are wrapped by organic carbon sources, and the surfaces of the nanometer silicon particles are oxidized; performing organic carbon source splitting decomposition on the nanometer silicon particles provided with the embedded nanometer SiO2 and oxidized surfaces and wrapped by the organic carbon sources, performing etching processing on the SiO2 on the nanometer silicon particles provided with the embedded nanometer SiO2 and oxidized surfaces and wrapped by amorphous carbon by adopting HF, and the like. The negative electrode material of the lithium ion battery is the nanometer silicon and carbon composite negative electrode material. The nanometer silicon and carbon composite negative electrode material and the lithium ion battery are excellent in cycling stability, specific capacity, rate capability and safety performance.

A pressure sensitive material used in a flexible touch sensor and a preparation method thereof are characterized in that: the material adopts carbon black, a silicon rubber composite system and added nano SiO2 or nano Al2O3 as raw materials; according to the preparation method, all raw materials are mixed in turn under normal temperature and normal pressure to obtain mixed solution which is injected into a touch sensor structural model, thereby curing forming is completed at room temperature. The pressure sensitive material, which has excellent touch sensing function and flexility, is suitable to be used in a touch sensor array structure designed at will; moreover, the preparation method has a simple process.

The present invention relates to one kind of nanometer inorganic matter/polymer composite insulating paint for electric power apparatus and protecting equipment and its preparation process, and belongs to the field of chemical paint technology and electric insulating technology. The paint consists of one to three kinds of nanometer inorganic materials, including SiO2, TiO2, Al2O3, ZnO, CuO and Fe2O3; one polymer of epoxy resin, polyimide and organopolysiloxane; and coupling agent, in the weight ratio of (1-8) to 100 to (0.02-0.08). Its preparation process includes mixing the nanometer particle with coupling agent, adding the polymer, adding organic solvent, ultrasonic dispersing at 50-100 deg.c to obtain stable suspension, and vacuum treatment at 80-120 deg.c to eliminate solvent and gas to obtain the composite insulating paint. The composite insulating paint may be cured at 120-300 deg.c for 5-18 hr to obtain insulating coating.

The invention relates to a preparation method of an acrylic resin finishing agent modified by nano silicon dioxide (SiO2)-coated multi-walled carbon nanotubes (MWCNTs). The acrylic resin emulsion has excellent film-forming property, mechanical stability and adhesion, but the characteristic of a linear structure of polyacrylate cause the problems of ''stickiness when heated and brittleness when cooled'' of the coating, poor solvent resistance, unstable adhesion of the coating and the like. The method provided by the invention comprises the steps of preparing MWCNTs/SiO2 nano composite particles through a sol-gel process of tetraethoxysilane, modifying the MWCNTs/SiO2 nano composite particles with a silicane coupling agent, and bonding the MWCNTs/SiO2 nano composite particles modified by the silicane coupling agent into the polyacrylate chains through an in-situ emulsion polymerization. The method provided by the invention uses water as a reaction medium, which is environment-friendly and can achieve continuous operation easily; and excellent characteristics of MWCNTs and SiO2 are introduced into acrylic resin, which can overcome the drawback of ''stickiness when heated and brittleness when cooled'' of the acrylic resin and can further increase the intensity, water resistance, heat resistance, gas permeability, yellowing resistance and flame resistance of the coating.

A composite organosilicon modified acrylatel inorganic nano emulsion features that the nano-class inorganic phase (SiO2, TiO2, ZnO and CaCo3) is contained in the particles of organosilicon modified acrylate emulsion, and is prepared through reverse emulsion polymerizing and in-situ emulsion polymerizing. Its advnatages are high mechanical, self-cleaning and antistatic performance and high stability. It can be used for paint, adhesive, polishing agent and cement modifier.

The invention relates to the field of high molecule synthesis. In order to solve the problems that the content of nano SiO2 in an acrylate polymer emulsion system is lower and the modifying process on the surface of SiO2 is tedious and the like, the invention provides a polysilsesquioxane-polyacrylate-nano SiO2 composite emulsion which consists of 20-60 parts of a polysilsesquioxane emulsion, 15-35 parts of alkyl methacrylate, 15-35 parts of alkyl acrylate, 1-5 parts of hydroxyl alkyl acrylate, 0.1-1 part of an initiator, 40-80 parts of water, 30-60 parts of a silica sol and 5-15 parts of a cosolvent. The emulsion has good appearance and storage stability. The film is high in transparency, the hardness reaches 6H, the adhesive force is level 1, and the content of silicon based on SiO2 reaches over 25%. The high silicon content polysilsesquioxane-polyacrylate-nano SiO2 composite emulsion integrates advantages of organic and inorganic materials, and the film has excellent performances such as ageing resistance, heat resistance, scratch resistance, wear resistance and high hardness. The emulsion has a wide application prospect in the fields of coatings and adhesives.

The invention aims at the shortcomings that inorganic nanometer particles are easy to conglomerate and poor in compatibility with a polymer, a polymer emulsion is unstable, and directional conglomerating of emulsion bundles is easy to appear and residues are easy to generate during the polymerization process in a traditional inorganic or organic composite emulsion, and provides a preparing method of a composite styrene-acrylic emulsion containing silicon dioxide. The preparing method includes: using an in situ sol-gel method to produce nanometer silicon dioxide particles which are uniformly dispersed in monomer, and controllable in particle morphology and particle diameters; then preparing a seed emulsion containing the silicon dioxide particles after obtaining a styrene-acrylic pre-emulsion by using mixed type emulsifiers; and finally preparing the composite styrene-acrylic emulsion by adopting a seed emulsion polymerization method. By adopting the preparing method, the styrene-acrylic emulsion of which silicon dioxide is high in filling volume, and uniformly and stable dispersed in the emulsion is obtained.

The invention discloses water-based nano synthetic leather slurry and a method for manufacturing nano synthetic leather. The method is characterized by comprising the following steps of: uniformly mixing 100 weight parts of water-based polyurethane/nano SiO2 or TiO2 emulsion with solid content of 25 to 40 weight percent, 15 to 22 weight parts of filler, 0.1 to 0.5 weight part of leveling agent, 0.1 to 0.5 weight part of antifoaming agent and 0.1 to 0.3 weight part of thickening agent to prepare nano composite slurry; uniformly scraping the water-based polyurethane/nano SiO2 or TiO2 emulsion on release paper by using a transfer method, drying the release paper in a blowing dry box at the temperature of between 100 and 130 DEG C, and cooling the release paper by using a cooling roller at a linear speed of between 15 and 20m/min; scraping a second layer of the water-based polyurethane/nano SiO2 or TiO2 emulsion on the release paper, drying and cooling the second layer under the same conditions; scraping a third layer of the water-based polyurethane/nano SiO2 or TiO2 emulsion, and drying the third layer in the blowing dry box at the temperature of between 100 and 110 DEG C; laminating base cloth on the coating layer of the release paper in a semi-dry state at the linear speed of between 15 and 20 m/min; drying the coating in the blowing dry box at the temperature of between 100 and 130 DEG C at the linear speed of between 15 and 20m/min; and separating the paper from the leather and rolling up the paper and the leather respectively to prepare the nano synthetic leather.