682 results about "Orthosilicate" patented technology

The invention relates to a preparation method of a super-hydrophobic cellulose material with a micro-nano structure. The method comprises the following steps: (1) adding ethyl orthosilicate and functionalized siloxane into an ethanol system containing deionized water to obtain a dispersion liquid of functionalized silica particles A in the presence of ammonium hydroxide serving as a catalyst; with the dispersion liquid of functionalized silica particles A as seeds, sequentially adding the ethyl orthosilicate, the functionalized siloxane, the deionized water, the ammonium hydroxide and the ethanol so as to obtain a dispersion liquid of functionalized silica particles B; (2) performing ultrasonic dispersion on the two types of functionalized silica particles in dimethylformamide, then adding a hydrophobic polymer and a low surface energy additive into the system and evenly stirring so as to form white dispersion liquid; and (3) coating the white dispersion liquid obtained in the step (2) on a natural cellulose material in a direct spraying manner or a spin coating manner so as to obtain the super-hydrophobic cellulose material with the micro-nano structure. The coating material has strong scouring resistance and acid-alkali resistance besides the excellent hydrophobic property.

The invention discloses an organic-inorganic hybrid super-hydrophilic coating as well as a preparation method and an application thereof. The preparation method comprises: firstly carrying out hydrolysis condensation polymerization by a sol-gel method with ethyl orthosilicate used as a precursor, hydrochloric acid used as a catalyst, ethanol used as a solvent, a silane coupling agent used as a modifier and a proper amount of water to obtain a modified silica sol, then carrying out free radical polymerization on the modified silica sol and reactive hydrophilic monomers to obtain an organic-inorganic hybrid material, and carrying out solvent replacement to obtain an aqueous organic-inorganic hybrid super-hydrophilic coating. The coating is coated on plastics, glass or metal substrates through dipping or brushing to form a coating layer, the coating layer has a contact angle with water less than 5 degrees, the adhesion force with the substrates of level-0 and the hardness greater than 6H, and water drops can spread out quickly on the coating layer.

The invention relates to organic-inorganic hybrid ultraviolet cured paint for metal surface protection. The paint comprises the following components in percentage by weight: 10 to 25 percent of epoxy modified silicon dioxide gel-resin, 15 to 30 percent of bisphenol-A epoxy acrylic ester, 5 to 15 percent of urethane acrylate, 35 to 45 percent of reactive diluent, 2 to 5 percent of toughener, 4 to 6 percent of photoinitiator, 0.5 to 0 percent of addition agent, wherein the epoxy modified silicon dioxide gel-resin is prepared by hydrolyzing a mixture of ethyl orthosilicate and gamma-glycidoxy propyl trimethoxy silane by a sol-gel method first and then adding diethylenetriamine. The paint film formed after the curing of paint has good strength, hardness, flexibility and strong acid and base resistance. The invention solves the problems that the organic-inorganic hybrid paint has high requirement on curing and common ultraviolet cured paint has poor adhesive force and flexibility when cured on metal base materials.

The invention provides a preparation method of a silicon dioxide super-hydrophobic thin film. The preparation method comprises the following steps of: step one. preparing alkaline colloidal sol, namely mixing orthosilicate ester, a basic catalyst, a solvent and water to prepare the SiO2 alkaline colloidal sol; step two. adding hexamethyl disilazane to the SiO2 alkaline colloidal sol for reaction to obtain modified SiO colloidal sol; and step three. coating the modified SiO colloidal sol on the surface of a substrate, and drying to obtain the silicon dioxide super-hydrophobic thin film. The invention also provides a super-hydrophobic material. The silicon dioxide super-hydrophobic thin film prepared by the method has strong adhesion force with a substrate and a good dewatering effect; complicated equipment is not needed; the process is simple; the preparation cycle is shortened; the cost is saved; and the application range is wide.

The invention relates to magnetic silicon dioxide microspheres with a nuclear shell and surface anisotropic double functional groups and a preparation method thereof. The preparation method comprises the following steps of: preparing superparamagetic microspheres by a solvothermal process; preparing magnetic microspheres which are coated by silicon dioxide by a sol-gel process; preparing the magnetic silicon dioxide microspheres of which the surface has amino group by taking the magnetic silicon dioxide microspheres as seeds and by the copolycondensation of alkyl ester orthosilicate and a silane coupling agent, and drying the magnetic silicon dioxide microspheres to obtain samples; and by a PICKERING emulsion technology, stabilizing a paraffin/aqueous emulsion system with a micrometer scale by using the aminated magnetic microspheres to form single-layer close packing of the magnetic microspheres on the surface of paraffin spheres, then reacting the amino group on the surface of the magnetic microspheres which is exposed in a liquid phase with succinic anhydride to introduce carboxyl into the partial surface of the microspheres, so that the surfaces of the magnetic microspheres have the anisotropic double functional groups. The obtained magnetic microspheres with the double functional groups have the advantages that: magnetic responsiveness is high; grain size can be controlled between 200 and 800 namometers; and the density of the surface functional groups can be adjusted.

The invention belongs to the technical field of nano materials and biomedicine, in particular to multifunctional core-shell structure fluorescent coding magnetic microspheres and a preparation method thereof. On the basis of ferroferric oxide nanoparticles synthesized by a hydrothermal process, pre-prepared coupled product of fluoresceins and amino propyl trimethoxysilane and ethyl orthosilicate are subjected to cohydrolysis in ammonia water to form a multifunctional fluorescent magnetic nano composite material with fluorescent and magnetic properties and high biological stability and biological adaptability. By regulating the mixing ratio of fluoresceins, namely fluorescein isothiocyanate (FITC) and rhodamine B isothiocyanate (RBITC), various fluorescent coding magnetic microspheres can be prepared, and the particle size of obtained material can be regulated according to the different ratios of the added ethyl orthosilicate to the ferroferric oxide. In addition, the obtained multifunctional composite nano material is subjected to amino silanization modification, so the biological application range of the novel fluorescent coding magnetic microspheres is further expanded and the novel fluorescent coding magnetic microspheres have bright application prospect in fields of biomedicine technology, medicine development, suspension chip and the like.

Disclosed is a method for preparation of molecular sieve modified by SBA- 15 surface sulfuric acid group, which contains the step: with polymer of the polyethylene glycol- polyglycerol- polyethylene glycol as the template agent, 3-mercaptopropyl-trimethoxysilane condensing ethyl orthosilicate in a acid condition, and by the oxidization of hydroperoxide, the molecular sieve modified by propanesulfonic acid being synthesized. The method for preparation is simple, the operation is easy, and the reaction condition is mild; the acid containing and the structure of the molecular can be regulated and controlled by regulating the matching of materials and processing parameter, the acid quantity being among 0.48- 1.15mmolH+/ g, specific surface being among 445- 680m2/ g, and the pore diameter being among 5.47- 7.58nm.

The invention discloses a method for preparing a hollow silica nanosphere by one step. The method comprises the following steps: mixing a poly-N-isopropyl acrylamide aqueous solution and an ethyl orthosilicate prehydrolysis solution at a temperature of 40 to 60 DEG C to react at a constant temperature for 160 to 180 hours; and carrying out ethanol washing, ultrasonic concussion, centrifugal separation and drying on a reaction liquid, and then obtaining the hollow silica nanosphere. The hollow silica nanosphere has a hollow core and mesoporous shell structure, the particle diameter is between 200 and 600 nm, and the shell thickness is between 30 and 100 nm. The invention also discloses the hollow silica nanosphere and the application. The method does not need to use an organic solvent to catalyze or further remove a template agent by high-temperature calcination or chemical corrosion, and can control the hollow nanosphere size and the shell thickness by simply changing the reaction temperature, the reaction time and the feed ratio.

The invention belongs to the field of fine chemicals, and relates to a method for preparing a water-based ultraviolet barrier coating with ZnO quantum dots (QDs). The method comprises the steps that ethanol solutions of zinc salt and lithium hydroxide are subjected to a sol-gel reaction; the ZnO QDs are prepared; ethyl orthosilicate serves as a raw material; the surfaces of the ZnO QDs are coated with a layer of silicon dioxide in situ; ZnO QDs@SiO2 kernel-shell nano particles with the photocatalytic activity inhibited effectively are formed, transferred into water, and composited with water-based film forming resin and a wetting agent; and the water-based ultraviolet barrier coating is formed. The content of ZnO QDs@SiO2 in a dry film is 1-50%, and overall barrier of ultraviolet rays with wavelengths less than 340nm is achieved by adjusting the thickness of the film and the content of ZnO QDs@SiO2. According to the method, the ultraviolet barrier coating is water-based, environment-friendly and non-toxic, is applicable to outdoor bamboo, wood, plastic and the like, and can be used for preparing transparent ultraviolet barrier glass.

The invention provides a preparation method of ultra-hydrophilic transparent SiO2/TiO2 antifog film. The preparation method employs a sol-gel method, and comprises the following steps: preparing a nanometer SiO2 sol by using ethyl orthosilicate as raw material; preparing a nanometer TiO2 sol using tetrabutyl titanate as raw material; preparing a SiO2/TiO2 sol by mixing SiO2 sol and TiO2 sol according to a ratio; preparing films of different layers by coating a pretreated glass base material with the SiO2/TiO2 sol by using a spin coating mode; and then placing the material in a muffle furnace for annealing. The invention has the advantages of simple equipment and low cost, and the SiO2/TiO2 film has super hydrophilicity and high light transmittance under visible light, and can be used for building glass, wind screen glass, bathroom glass and various antifog occasions.

The invention discloses a method for increasing dyeing and fixation rate of a reactive dye to wood. The method for increasing the dyeing and fixation rate of the reactive dye to the wood comprises the following steps: respectively extracting to-be-dyed wood in hot water, NaOH solution and H2O2; after reactive dye liquor and anhydrous sodium sulphate are mixed, dyeing the extracted wood to obtain dyed wood; then carrying out fixation to the dyed wood by adopting an alkali silica sol fixing agent, wherein the alkali silica sol fixing agent is prepared by carrying out sol-gel reaction on ethyl orthosilicate, a silane coupling agent, ethanol, water and ammonia which are taken as raw materials; soaping with the fixed wood by adopting soap lotion, then washing with cold water, and drying, thus the dyed and fixed wood is obtained. The method for increasing the dyeing and fixation rate of the reactive dye to the wood has the advantages that a technology is simple, the dyeing and fixation rate of the reactive dye to the wood is high, and an alcohol organic solvent can be recycled, so that increase of difficulty for treating printing and dyeing wastewater caused by using a large number of salts is avoided, and the method for increasing the dyeing and fixation rate of the reactive dye to the wood is safe, energy-saving, economical and environment-friendly.

The invention relates to a preparation method of an organic silicon resin, particularly a preparation method of a vinylphenyl silicon resin for LED (light-emitting diode) packaging. The preparation method comprises the following steps: 1) adding water into a kettle, and adding a solvent; 2) adding a blocking agent, stirring, and adding an acidic catalyst; 3) stirring the mixed solution at normal temperature, dropwisely adding an ethanol solution of one or more of phenyl alkoxy silane, vinyl alkoxy silane and ethyl orthosilicate at 0-60 DEG C; 4) after finishing the dropwise addition, hydrolyzing for 30-600 minutes; 5) standing for 5-30 hours to stratify; and 6) treating with a condensation additive for an oil solution, and removing low boilers, thereby obtaining the product vinylphenyl silicon resin. The invention has the advantages of cheap and accessible raw materials, mild conditions and simple technique, and is simple to operate and convenient for industrialization.

The invention relates to a preparation method and silicon modification method of a visible light catalysis material for a graphene/bismuth tungstate flake nanostructure. According to the preparation method and the silicon modification method, with bismuth nitrate, tungstate, ethyl orthosilicate and graphene as raw materials, the solar catalysis material for the graphene/bismuth tungstate flake nanostructure is prepared by the steps including an organic electrolyte assisted hydrothermal method, low temperature freezing, ageing, washing, drying and the like, and the catalysis performance of the material is further enhanced by silicon modification. The preparation method and the silicon modification method disclosed by the invention have the greatest characteristics that the strong-adsorption and high-activity visible light catalysis material for a graphene/bismuth nitrate flake is obtained by using the low-temperature freezing organic electrolyte assisted hydrothermal method, and the performance of the graphene/bismuth tungstate flake structure is further improved by silicon modification. The catalysis material can be applied to the fields of sewage treatment, light degradation of water, air purification, solar batteries and the like.

The invention discloses a preparation method of a porous 5A molecular sieve for straight-chain alkane adsorption and belongs to the technical field of molecular sieve adsorbents. The preparation method comprises the following steps of adding ethyl orthosilicate into a sodium hydroxide aqueous solution, carrying out stirring for some time, fully dissolving sodium metaaluminate in water, fast mixing the two solutions, carrying out violent stirring to obtain milky colloid, carrying out crystallization on the colloid at a temperature of 80-95 DEG C for 4-6h, carrying out cooling, carrying out filtration, carrying out washing until a pH value is less than 9, carrying out drying by an oven to obtain 4A molecular sieve raw powder, carrying out ion exchange on the 4A molecular sieve raw powder and a calcium chloride solution to obtain the 5A molecular sieve. The 5A molecular sieve has n-decane static saturated adsorption capacity of 0.538g/g and n-pentdecne static saturated adsorption capacity of 0.647g/g. The 5A molecular sieve is prepared from an organic silicon source ethyl orthosilicate replacing an inorganic silicon source sodium silicate so that the channels of the 5A molecular sieve have diversity. The 5A molecular sieve has a good saturation adsorption amount of straight-chain alkanes.

The invention provides a preparation method of electromagnetic composite hollow microspheres, relates to a preparation method of a composite hollow material and aims to solve the problems of poor conductivity, high density and high falling possibility of magnetic particles of the existing composite hollow material. The preparation method comprises the following steps: 1, preparing polystyrene microspheres; 2, dispersing the polystyrene microspheres in concentrated sulfuric acid, and sulfonating; 3, preparing a magnetic Fe3O4 nano particle suspension; 4, adding the sulfonic-group-containing SPS microspheres and the Fe3O4 nano particle suspension into a water solution; 5, adding ethanol and ammonia water, and dropwisely adding ethyl orthosilicate; 6, adding into a PVP-containing ethanol solution, and stirring; and 7, mixing an aniline solution with the PVP modified magnetic microspheres, dropwisely adding ammonium persulfate, drying, adding N,N-dimethylformamide, and soaking. For the prepared hollow microspheres, the conductivity is 0.01-1.0 S/cm, the density is low, and the magnetic particles are less prone to fall; and the hollow microspheres are mainly used in the fields of light-weight electromagnetic materials, photonic crystals, wave-absorbing materials and the like.

The invention discloses a preparation method of silica aerogel. Ethyl orthosilicate serves as a silicon source, methyl triethoxysilane serves as a co-precursor, ultrasonic water serves as a reactant,absolute ethyl alcohol serves as a solvent, hydrochloric acid and ammonia water serve as catalysts, SiO2 wet gel is prepared by acid-base two-step catalysis, secondary modification and ambient pressure drying and soaked in absolute ethyl alcohol solution, a wet gel sample is subjected to surface modification in trimethylchlorosilane, absolute ethyl alcohol and n-hexane mixed solution with a certain volume ratio after standing and aging for a period of time, and finally, the SiO2 aerogel is prepared by ambient pressure drying in air atmosphere. The method for preparing the silica aerogel is simple in process and strong in controllability and has good heat conductivity coefficient, specific surface area, average pore diameters, density, porosity, contact angles and reproducibility.

The invention belongs to the field of synthesis of inorganic nano materials, and in particular relates to a method for preparing hierarchical porous carbon. The three-dimensional hierarchical porous carbon is prepared by using resorcinol, formaldehyde, ethyl orthosilicate, ethanol, deionized water, hydrochloric acid and hollow polystyrene microspheres as raw materials. The preparation method is characterized in that a carbon material with a reverse opal structure is efficiently obtained by using the polystyrene microspheres with hollow structures, carbon nano particles with mesopores are formed in ordered macropores, micropores are obtained by activation of carbon dioxide, and the three-dimensional hierarchical porous material is finally obtained. The porous carbon is provided with regularly arranged macropores with the diameters of 100 nanometers, mesopores with the diameters of about 8 nanometers and micropores with the diameters of less than 2 nanometers. The structure of the pores can be controlled by controlling the particle size of template microspheres and the concentration of a carbon source precursor solution. Equipment for the method is simple; the raw materials are common chemical raw materials, so the cost is low; and the preparation method is simple and beneficial to large-scale industrial production.

The invention relates to a preparation method of a lithium silicate porous material used for absorption of high temperature CO2; according to the preparation method, lithium nitrate is used as a lithium source and an oxidizing agent, ethyl orthosilicate is used as a silica source, citric acid is used as a complexing agent and a fuel, a mixture of ethanol and water is used as a solvent, and a sol-gel combustion synthesis method is used. The preparation method is as follows: first, the citric acid and the lithium nitrate are dissolved in the solvent, then the ethyl orthosilicate is added to obtain a precursor by hydrolysis, sol-gelatinization, ageing and drying, after compression moulding, the precursor is ignited in air, and after combustion, the lithium silicate porous material used for absorption of high temperature CO2 can be obtained. The lithium silicate porous material used for absorption of high temperature CO2 is uniform in pore distribution and high in activity of carbon dioxide absorption. Compared with the prior art, the lithium silicate porous material is directly prepared by the sol-gel combustion synthesis method, the technological process is simplified without the need for complex and expensive equipment, and the lithium silicate porous material is easy to realize the industrialized production.

The present invention discloses a self-cleaning hydrophilic coating liquid, which is prepared from the following components by weight: 1 to 5% of orthosilicate, 0.1 to 5% of titanate, 0.1 to 5% of polyether siloxane, 0.01 to 0.5% of a catalyst and balance of an organic solvent, the orthosilicate is tetramethyl orthosilicate ortetraethyl orthosilicate, the titanate is tetrabutyl titanate or tetraethyl titanate, the polyether siloxane is polyether trimethoxy silane, when the substrate surface is scoured by water, the water can slide down automatically, the substrate also has superior hydrophilicity without ultraviolet radiation, the substrate surface can be cleaned by nature rain effect or a small amount of water for washing, the self-cleaning hydrophilic coating liquid can be can be cured naturally at room temperature without high temperature and other film forming conditions, energy is saved, and scratch resistance, peel resistance and other mechanical strength the coated film layer are greatly increased. The self-cleaning hydrophilic coating liquid is applicable to engineering glass, photovoltaic glass, stone materials, metal surfaces, automotive exterior mirrors and glasses.

The invention provides a preparation method of an SiO2 (Silicon Dioxide) aerogel modified polypropylene melt-blown nonwoven material. The preparation method comprises the following steps of (1) usingtetraethyl orthosilicate as a silicon source, preparing SiO2 aerogel by a sol-gel method, and performing crushing after the SiO2 aerogel is subjected to hydrophobic modification to obtain hydrophobicSiO2 aerogel powder; (2) mixing the hydrophobic SiO2 aerogel powder with polypropylene slices, and performing melting granulation to obtain an SiO2 aerogel/ polypropylene composite masterbatch; and (3) performing melt-blowing after the SiO2 aerogel/ polypropylene composite masterbatch and pure polypropylene are mixed to prepare the SiO2 aerogel modified polypropylene melt-blown nonwoven material.Compared with a polypropylene melt-blown nonwoven material before modification, the modified material has higher oil absorption performance and a higher oil holding rate. The SiO2 aerogel modified polypropylene melt-blown nonwoven material provided by the invention has good mechanical properties, low production cost and a simple process, is hopeful to realize scaled production, and can be used foremergency treatment of oil stain and oil spilling leakage.

The invention discloses a method for coloring a magnesium alloy composite film by micro-arc oxidation. The method comprises the following steps: (1) grinding an AZ91 magnesium alloy, washing with water, washing with alkali, washing with water, cleaning with ultrasonic waves and washing with deionized water for 2-3 times; (2) placing the AZ91 magnesium alloy serving as an anode in a micro-arc oxidation electrolyte and carrying out micro-arc oxidation treatment, wherein the cathode is stainless steel; (3) dissolving 1-10ml of ethyl Orthosilicate in 40-50ml of absolute ethyl alcohol; adding 1-2g of zirconium oxychloride; magnetically stirring for 0.5-1.5 hours at constant temperature in a 50 DEG C water bath; adding 0.1-0.5g of copper sulfate pentahydrate and 5-20mg of glucose and continuously stirring for 0.5-1 hour at 50 DEG C; after the liquor is cooled, obtaining a green SiO2-ZrO3 colloid; and (4) immersing a micro-arc oxidation film sample in the SiO2-ZrO3 colloid; soaking; slowly pulling the sample out at a uniform velocity; repeatedly pulling the sample twice; drying; soaking again; slowly pulling the sample out at the uniform velocity; drying; then heating to 150-200 DEG C; and curing for 0.5-1 hour. According to the method disclosed by the invention for surface treatment of the magnesium alloy, a uniform green film with high corrosion resistance can be obtained.

The invention discloses a modifier for cement concrete and a method for improving performance of the cement concrete. The modifier is silicon dioxide sol obtained by partial hydrolysis of orthosilicate. The modifier can be coated on the surface of a cement concrete material after molding, thereby modifying and curing the cement concrete. According to the modifier disclosed by the invention, a weak acid is used as a catalyst, thereby realizing partial hydrolysis of orthosilicate to form the network-like transparent sol with a very small size, being very easy to infiltrate into cement, mortar and concrete, simultaneously preventing a strong acid from damaging the cement and the concrete and finally forming a protective layer capable of inhibiting an external corrosive medium from entering and eroding. The sol is simple in preparation process, few in raw materials for composition, convenient to operate, low in cost and significant in effects, can be widely applied to modification of cement, mortar and concrete materials, and has important significance for early prevention and later maintenance of the cement, mortar and concrete.