258 results about "Superhydrophilicity" patented technology

Superhydrophilic and superhydrophobic fabrics are taught having a superhydrophilic or superhydrophobic powder disposed on the fabric. The superhydrophilic powder has at least one material of sodium borosilicate glass and porous diatomaceous earth. The powder material has a contiguous interpenetrating structure with a plurality of spaced apart nanostructured surface features. The superhydrophilic powder is switched to superhydrophobic by adding at least one superhydrophobic material of perfluorinated organics, fluorinated organics, and self-assembled monolayers.

An ultrahydrophilic and/or ultralipophilic material with nano-pores used in self-cleaning, bactericiding, antifog, adsorptive, catalytic and wave-absorptive fields is prepared from the material with nano-pores and the functional nano-particles through compounding.

The invention relates to a method for preparing hydrophilic/oleophobic oil-water separation stainless steel net films. Stainless steel nets are used as bases. The method includes constructing a poly-dopamine medium layer on the surface of each stainless steel net in dip-coating or spraying modes; dipping the stainless steel nets with the poly-dopamine medium layers in zwitter-ionic polymers with active ester groups; or spraying the zwitter-ionic polymers with the active ester groups on the surfaces and meshes of the stainless steel nets with the poly-dopamine medium layers; carrying out amidation coupling reaction on the zwitter-ionic polymers and each poly-dopamine medium layer to form a stable hydrophilic polymer film on the surface and the meshes of the corresponding stainless steel net. The method has the advantages that the hydrophilic/oleophobic oil-water separation stainless steel net films prepared by the aid of the method are super-hydrophilic and are high in water flux, stable in structural performance and high in anti-pollution capacity; the method has a broad application prospect in the aspects of recycling marine oil slick, removing water from crude oil, treating oily sewage and the like.

The invention discloses a super-hydrophilic and underwater super-oleophobic oil-water separation mesh film and a preparation method thereof. The method comprises the following steps: ultrasonically cleaning a fabric silk screen and airing at normal temperature; preparing polymer emulsion particle microspheres of which the particle size distribution is 100-500nm and the surface is rich in carboxyl salt by adopting an emulsion polymerization, and preparing nano-silica sol by adopting a sol-gel method; preparing hydrophilic emulsion particles and the nano sol into a mixed solution and performing uniformly ultrasonic dispersion; immersing the silk screen into the mixed solution, vertically lifting up, or directly spraying by adopting a high-pressure spray gun, and drying to obtain the super-hydrophilic and underwater super-oleophobic oil-water separation mesh film. The surface of the oil-water separation mesh film has a spherical rough micro-nano binary structure, contact angles with water and oil in air are 0 degree, and the oil-water separation mesh film has the super hydrophilicity. A contact angle with oil drops under water is larger than 150 degrees, and the oil-water separation mesh film has low adhesion properties on the oil drops. The mesh film can be applied to separating oil water mixtures and treating oily sewage.

A preparation method for super-hydrophobic and super-hydrophilic electrostatic spinning nanofiber composite membranes belongs to the field of the nanofiber composite membranes. For the method, the raw materials are easy to obtain, the process is simple, and the operation is convenient and quick. In the method, the electrostatic spinning technology is mainly adopted to prepare the polymer nanofiber composite membranes, different solvents and different treatment methods are adopted, the nanofiber composite membranes are super-hydrophobic or super-hydrophilic, and the mechanical property is improved. The preparation method is simple, the spinning process is stable, the fiber is small in diameter and light in weight, no pollution is caused, and the preparation method is widely applied to the fields of filter materials, construction paint, mineral floatation and the like.

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 preparation method of super-hydrophilic mesoporous silicon oxide films. The method employs a sol-gel technique, utilizes ethyl orthosilicate as a silicon source and utilizespolyoxyethylene (4) laurinol as a template agent so as to prepare the mesoporous silicon oxide films on the surface of a glass substrate by a rotary coating method. The wrapping angle between the filmand water is 0 DEG, and the film is super-hydrophilic. The film formed on the glass has the advantages of high luminousness, no color, transparency, stability, evenness and wear resistance; and the surface of the film is easy to wash after being polluted by dust. The method has the advantages of simple operation, short period and low cost and can be widely used on the substrates of glass curtainwalls, bathroom mirrors, automobile windshields, rearview mirrors and the like which need self-cleaning antifog treatment.

The invention discloses a method for preparing a super-hydrophilic polyvinylidene fluoride membrane. The method comprises the following steps: 1) mixing polyvinylidene fluoride, a copolymer containing maleic anhydride, a solvent and an aperture regulator, and then performing vacuum de-foaming to obtain a membrane preparing solution; 2) performing phase inversion on the acquired membrane in the presence of alcohol used as a coagulating bath to obtain a polyvinylidene fluoride membrane; and 3) soaking the obtained polyvinylidene fluoride membrane in an amino silane solution for a period of timeto obtain the super-hydrophilic polyvinylidene fluoride membrane. The super-hydrophilic polyvinylidene fluoride membrane prepared by using the method has the advantages that the preparation cost is low, the process is simple, the super-hydrophilic property of the membrane is more stable because of an organic inorganic hybridized membrane surface, and the membrane has better mechanical property and thermal property because of the use of the hybridized materials.

The invention which provides a preparation method of a superhydrophilic TiO2/SiO2 porous bilaminar membrane which has a high transmittance and can perform the superhydrophilicity under visible light belongs to the technical field of nanomaterials. The method comprises the following steps: 1, carrying out spin coating on a glass substrate with an SiO2 sol, drying, carrying out spin coating with a mixed solution of polyethylene glycol 2000 and TiO2, and drying the glass substrate in a drying box for 20-40min at 80-120DEG C; 2, heating the dried glass substrate in a muffle furnace to 450-550DEG C according to a heating rate of 2-3DEG C/min, and annealing for 2-3h; and 3, naturally cooling to room temperature after completing the anneal to obtain the superhydrophilic TiO2/SiO2 porous bilaminar membrane. The prepared superhydrophilic TiO2/SiO2 porous bilaminar membrane of the invention, which has a highly ordered porous structure and a high transmittance, can perform the superhydrophilicity under visible light and has a good antifog effect, can be applied to various antifog occasions of building glass, automobile rearview windows, windscreens, bathroom glass and the like.

The invention relates to a method for improving the surface hydrophilicity of medical titanium or a titanium alloy, which is characterized by comprising the following steps of: placing the titanium or the titanium alloy in 1.0-5.0 M of NaOH solution and then treating 12-24 hours at 60-80 DEG C to form a nano porous sodium titanate gel layer on the surface; and then soaking the alkali liquor-treated sample in 0.1 M of diluted hydrochloric acid for 12 hours at the room temperature to transform the nano porous sodium titanate gel layer into a nano porous titanium oxide gel layer. The titanium oxide gel layer can be crystallized by thermally treating 0.5-2.0 hours at 500-600 DEG C. After a nano porous titanium oxide film is irradiated for 3-4 hours by ultraviolet rays (the wavelength is 253 nm) or is treated for 2-4 minutes by atmosphere plasmas, the superhydrophilicity can be obtained, and the high hydrophilicity of the superhydrophilic sample can be maintained after the superhydrophilic sample is preserved in deionized water. When used for improving the surface hydrophilicity of the medical titanium or the titanium alloy, the method has the characteristics of simple and easy feasibility, stable process, reliable performance, firm combination of a titanium dioxide layer, suitability for various titanium alloys and the like.

The invention discloses a superhydrophilic nano titanium dioxide photocatalysis composite membrane as well as a preparation method and application thereof. The superhydrophilic nano titanium dioxide photocatalysis composite membrane comprises nanosize titanium dioxide sol and a submicron particle; and the particle is selected from one or more of the following compounds: silicon dioxide, bismuth oxide, active carbon, zinc oxide and iron oxide. The composite membrane can also maintain superhydrophilic performance for a long time without illumination and improves the efficiency of air purification processing by changing a common hydrophilic titanium dioxide membrane into the superhydrophilic membrane. The photocatalysis membrane can be widely applied to the technical field of air purification processing.

The invention discloses a method for preparing self-cleaning antifogging coating film and belongs to the technical field of films. The method includes: subjecting a disperse system of tetrabutyl titanate to hydrothermal treatment to obtain TiO2 nano particle suspension; and dispersing SiO2 sol into the TiO2 suspension to obtain a TiO2/SiO2 composite film by means of the dip-coating technique. The TiO2 particles are adhered and attached to the surface of a glass substrate by amorphous SiO2. Proper roughness factors are jointly provided by the TiO2 particles and continuous nano pore passages distributed in the film, and the apparent contact angle of water on the surface can be effectively decreased. The wettability of water on the surface of the film is further improved by a great quantity of OH groups carried by the amorphous SiO2, so that the super-hydrophilcity of the film can still be maintained after long-time outdoor placement.

The present invention relates to a photocatalyst coating liquid capable of forming on an organic substrate a photocatalyst film that is excellent in photocatalytic functions such as super-hydrophilic nature and the performance of maintaining super-hydrophilic nature in a dark place and that has excellent durability, the photocatalyst coating liquid being excellent in stability, and a photocatalyst film formed therefrom, and there are provided a photocatalyst coating liquid comprising (A) titanium oxide fine particles formed of anatase type crystal, (B) colloidal silica and (C) a binder formed of a hydrolysis-condensate of a titanium alkoxide, and having, based on the total solid content, a component (A) content of 5 to 50 mass %, a component (B) content, as a solid content, of 25 to 75 mass % and a component (C) content, as a TiO₂ slid content, of 10 to 55 mass %, and a photocatalyst film formed from the above coating liquid.

The invention discloses a preparation method of an anticorrosive coating capable of self-repairing rapidly at room temperature, relating to a preparation method of an anticorrosive coating. According to the method, urea resin is taken as a wall material. A microcapsule repairing agent is high in coating rate and high in possibility of contact with a catalyst. A polythiol curing agent is taken as an outer layer core material, so that the effect of rapidly repairing cracks at room temperature can be achieved. By applying nano titanium dioxide with special photocatalytic performance, super hydrophobicity and ultraviolet ray shielding performance to the coating and keeping the nano titanium dioxide in a nanoscale state in the coating, the defects of poor weather resistance, easiness in staining and the like of an existing coating can be overcome, and the siphon action on micro cracks is improved since the nano titanium dioxide is porous. By adding self-repairing microcapsules into a mesoporous molecular sieve and a double-wall sandwich structure, the self-repairing performance of the coating is remarkably improved, the self-repairing time is shortened, and excellent corrosion resistance is realized.

The invention discloses a method for preparing a super-hydrophilic structure on a red copper surface and a red copper micro-heat tube manufactured by using the method. The method for preparing the red copper super-hydrophilic structure comprises the following four steps: preparing electrolyte, performing red copper surface pretreatment, constructing a micro-nano rough structure in an electrochemical deposition mode, and sintering. The contact angle of the super-hydrophilic structure prepared by using the method and water is 5-0 degree, and moreover the super-hydrophilic structure has good stability and high boundary binding strength, and can be used as a super-hydrophilic layer to be applied to the red copper micro-heat tube. Due to the good super-hydrophilic property, the heat conduction coefficient of the red copper micro-heat tube and the capillary force of the super-hydrophilic layer are greatly improved. By adopting the method, the conventional difficult problem in machining the red copper micro-heat tube is solved, and the method is simple and easy to control in process, low in cost and applicable to popularization.

The invention provides a preparation method of a compound material with super-hydrophilic polyvinylidene fluoride@dopamine@silicon dioxide. The preparation method comprises the following steps of: (1) preparing a polyvinylidene fluoride membrane; (2) preparing a polyvinylidene fluoride@dopamine membrane; (3) preparing the compound material with the super-hydrophilic polyvinylidene fluoride, the dopamine and the silicon dioxide. The compound material prepared by the invention is good in mechanical property and stable in structure, simultaneously has super-hydrophilic property and can be used for emulsion separation.

The invention provides a preparation method of a titanium implant surface with a micro-nano composite structure. The preparation method comprises the following steps: (1) performing blast sanding and ultrasonic processing on a smooth implant surface, then washing with water, and drying; (2) processing the implant surface in an oxalic acid solution for 30-240 min, then washing with water, and drying, wherein the concentration of the oxalic acid solution is 30% to saturation; and (3) taking a mixed acid solution of H2SO4 with the concentration of 98% and H2O2 with the concentration of 30% for processing, and then washing with water to obtain the titanium implant surface with the micro-nano composite structure. According to the preparation method of the titanium implant surface with the micro-nano composite structure, disclosed by the invention, the implant surface with the micro-nano composite structure is obtained by performing a secondary etching on a micron-structure surface processed by sand blast and oxalic acid, and compared to the micron-structure surface, titanium implant surface is provided with a microstructure with more levels, which is capable of providing more comprehensive environment signals for cell growth and tissue regeneration; and the titanium implant surface with the micro-nano composite structure has super-hydrophilicity and the protein adsorption capability is remarkably enhanced, which are of a great significance to further improving the surface biological activity of implants.

The invention provides a method for preparing a powder-TiO2 photoinduced super-hydrophilic composite film at a low temperature. Under the condition of ice-water bath, hydrochloric acid, H2O and tetrabutyl titanate are mixed in the volume ratio of (0.6-1.3):100:10 and react under stirring for 2h, aging is performed at the room temperature, and TiO2 sol is obtained; a powder photocatalytic material is added into solvent and subjected to ultrasonic dispersion to be uniform, and micro-sol made from the powder material is obtained; the TiO2 sol is mixed with the micro-sol made from powder photocatalytic material, and powder-TiO2 mixed sol is obtained after uniform dispersion; the powder-TiO2 mixed sol is sprayed for coating a carrier substrate at 80 DEG C, film coating is performed with a spraying method, and then drying at the room temperature is performed. The powder-TiO2 composite film prepared with the method is prevented from powder separation after being dried, and has good adhesive force; the film shows a good photoinduced super-hydrophilic property, and the light transmittance is relatively high; the film coating method has the advantages of simple operation, mild technological conditions, and relatively low cost, thereby facilitating industrial production and application.

The invention discloses a nanocrystalline metal oxide array with an under-oil super-hydrophobicity and super-hydrophilicity reversible transition function and a preparation method thereof. The static contact angle under the oil phase is larger than 150 degrees after the nanocrystalline metal oxide array is subjected to thermal treatment at the temperature ranging from 120 DEG C to 350 DEG C for 1 h to 4 h, and the nanocrystalline metal oxide array has super-hydrophobicity performance; the static contact angle of water under the oil phase is smaller than 10 degrees after the nanocrystalline metal oxide array is irradiated under ultraviolet light for 1 h to 2 h, the nanocrystalline metal oxide array has super-hydrophilicity performance, and the conversion from super-hydrophobicity to super-hydrophilicity is achieved; and after heating recovery is conducted for 1.5 h to 3 h at the temperature ranging from 100 DEG C to 150 DEG C, the static contact angle of water under the oil phase recovers to 150 degrees or above, the nanocrystalline metal oxide array has super-hydrophobicity performance, and the reversible conversion from super-hydrophilicity to super-hydrophobicity is achieved. According to the method, the nanocrystalline metal oxide array is prepared through an existing mature and simple method and is subjected to the processes of thermal treatment, ultraviolet irradiation and heating recovery, the function of reversible conversion from super-hydrophobicity to super-hydrophilicity under different oil phase complex environments is achieved, and therefore the application range of nanotube array intelligent conversion is widened, and important application prospects are achieved.

The invention discloses a zinc negative electrode material of a zinc air cell and a preparation method for the zinc negative electrode material. The negative electrode material comprises metal zinc powder, zinc oxide powder, a binder, and a dual-functional additive with a one-dimensional tubular structure and formed by dual-layer metal oxide; the preparation method comprises the steps of adding the metal zinc powder, the zinc oxide powder, a conductive agent and the dual-functional additive into a binder-containing solution, performing ultrasonic dispersion processing, and heating and evaporating a solvent while stirring to obtain the zinc negative electrode material. The zinc negative electrode material is added with the dual-functional additive which can lower electrode internal resistance as well as supply a diffusion channel for an electrolyte, so that the discharging capacity and the rate capability of the cell can be improved; and meanwhile, a titanium dioxide inner layer has super-hydrophilic property and insulativity, so that the water delivery property of the electrolyte diffusion channel is forcefully enlarged, channel blocking is prevented, and the cycling life and the capacity stability of the cell are effectively prolonged and improved.

The invention discloses a nanometer calcium silicate hydrate super-hydrophilicity thin film as well as a preparation method and applications of the thin film and belongs to the field of functional composite materials. The preparation method comprises the steps of: soaking a pretreated base film with negative electric charges on surface in a 1.0-8.0g/L cationic polyelectrolyte solution containing 0.01mol/mL-0.1mol/mL soluble calcium salt for 10-30 minutes, then taking out the base film and flushing the base film with deionized water; soaking the base film in a 1.0-8.0g/L anionic polyelectrolyte solution containing 0.01mol/mL-0.1mol/mL soluble silicate for 10-30 minutes, then taking out the base film and completely flushing the base film with deionized water; repeating above operations for 1-3 times to obtain the polyelectrolyte nanometer calcium silicate hydrate super-hydrophilicity thin film. The super-hydrophilicity thin film has a super-hydrophilicity property and an excellent anti-fog property.