48results about How to "Stay superhydrophobic" patented technology

The invention relates to a superhydrophobic coating hybridized with superhydrophilic particles and a preparation method thereof. The substrate was ultrasonically cleaned with acetone, absolute ethanol, and deionized water for 15 minutes in order to remove oil and dust on the surface; then, it was rinsed with absolute ethanol, dried with cold air, and set aside. on nano-SiO 2 The sol was modified with fluorosilane to obtain a superhydrophobic coating spray solution, and the superhydrophilic monodisperse spherical nano-SiO 2 The solution, silicon micropowder, and glass microspheres are respectively added to the above-mentioned superhydrophobic coating spray solution, stirred evenly, sprayed on the substrate, and cured to obtain a superhydrophobic coating hybridized with superhydrophilic particles. This coating not only has low adhesion superhydrophobicity, but also has significantly higher condensation efficiency and dew drop desorption than superhydrophobic coatings. The preparation process of the invention is simple, pollution-free, easy to operate, good in appearance quality and low in cost, and has broad application prospects and huge market benefits in heat exchangers, water collection, seawater desalination and the like.

The invention relates to a preparation method of an aluminum sheet, in particular to a preparation method of a super-hydrophobic aluminum sheet. The preparation method of the super-hydrophobic aluminum sheet concretely comprises the steps of removing a surface oxidation layer of the aluminum sheet, then cleaning, baking, allowing the aluminum sheet to serve as a positive pole and inert metal as a negative pole, electrolyzing the positive pole and the negative pole, cleaning again, drying, placing the aluminum sheet in a surface modifier to be soaked, cleaning, then drying, and obtaining the super-hydrophobic aluminum sheet. According to the preparation method, materials are easy to obtain, low in cost, safe and nontoxic; sodium chloride serves as an electrolyte; a direct current power supply can be replaced by a dry battery; a container containing an electrolytic solution for electrolysis can be replaced by a glass cup; stearine and tetradecanoic acid are safe and nontoxic, does not pollute the environment, and can be purchased in the market easily; the steps are simple; the preparation is convenient; an aluminum or aluminium alloy super-hydrophobic surface prepared by the method has very good surface hydrophobicity; a contact angle of the super-hydrophobic surface is about 160 degrees; a rolling angle of the super-hydrophobic surface is about 9 degrees; longer super-hydrophobicity can be kept at room temperature; and articles for daily use, such as sodium chloride, the direct current power supply, a lead wire and absolute ethyl alcohol can be used for preparing the super-hydrophobic aluminum surface.

The invention discloses a method for preparing a novel super-hydrophobic polyurethane oil-water separation material with no solvent. The method comprises the following steps that stearic acid is dissolved in polyether330 through ultrasound, water, silicone oil, stannous octoate and diethylenetriamine are added on the conditions that the temperature is 30-40 DEG C and the rotating speed is 1000-1500 r / min, and stirring is carried out for 1-5 min; at the temperature of 30-40 DEG C, toluene diisocynate is added, and a reaction solution is foamed after 5-10 s; after foaming is carried out for 10-15 min, the product is taken out to be placed in a drying oven with the temperature of 50-70 DEG C and treated for 4-6 h to obtain the super-hydrophobic polyurethane foam. The defect that a large amount of solvent is used in a traditional preparation method is overcome, the raw material sources are wide, and super-hydrophobicity, super-lipophilicity and mechanical property stability are achieved through the polymerization reaction of gel materials, foaming materials and modified materials.

The invention belongs to the field of electrostatic spinning functional materials, and relates to a preparation method of a material capable of being applied to the waterproof and moisture permeable field, in particular to a fluorinated graphene-containing waterproof and moisture-permeable composite fabric and a preparation method thereof. The composite fabric has the advantages of super-hydrophobicity, high efficiency, better air and moisture permeability, energy conservation and the like. The average diameter of the fiber is 130 to 150 nm, the nanofiber waterproof and moisture permeable composite film is of a three-dimensional network structure, the hole diameter is small, a curved communication hole structure is formed, breathability is good, external severe weather infringement can beeffectively avoided, rain and snow penetration is prevented, sweat and moisture generated by movement of a human body can be discharged in time, so that the microenvironment of the human body is regulated and controlled, good comfort is provided for the human body, the protection function and the heat and moisture comfort of the garment fabric are unified, and the composite fabric is innovativelyapplied to the fields of medical treatment and public health, building outer walls, aerospace, aquatic product industry and the like.

The invention relates to a preparation method of a high-flux pH-responsive oil-water separation membrane. The preparation method comprises: synthesizing polyamide acid (PAA); electro-spinning a PAA nanometer fiber membrane, and imidizing the PAA nanometer fiber membrane to a polyimide (PI) membrane; preparing pH-responsive silica nanoparticles (SNPs) / DA-TiO2 sol; modifying the PI nanometer fiber membrane with SNPs / DA-TiO2; characterizing pH responsiveness of the SNPs / DA-TiO2 / PI nanometer fiber membrane through a contact angle experiment; and testing the separation flux and efficiency via an oil-water separation experiment. The preparation method has advantages that through surface modification of a high-strength PI fiber membrane, a PI nanometer fiber membrane with biodegradability, low cost, nontoxicity, high flux and pH responsiveness is obtained. The high performance membrane material has bright application prospects in oil-water separation, sewage treatment and deep sea petroleum leakage.

The invention belongs to the technical field of superhydrophobic material preparation, and particularly relates to a method for converting hydrophilic sand into super-hydrophobic sand. The method mainly comprises the following steps: carrying out the structured processing and the low surface energy substance modification of sand surfaces. The water contact angle of the prepared super-hydrophobic sand is greater than 150 degrees, and water can freely roll on the surface of the sand without permeating. In addition, the super-hydrophobic sand exhibits extremely good thermostability, and still has good hydrophobicity at a temperature of 400DEG C. Meanwhile, the super-hydrophobic sand can be used for realizing the storage and the transportation of water, and has a good drag reduction effect. The preparation method disclosed by the invention has the advantages of simple technology, abundant raw materials, no toxin, environment protection, low cost and high thermostability, is suitable for large-area preparation and application, can be applied to the surface of a building to realize a super-hydrophobic wall, and also can be applied to the storage and the transportation of desert water so as to realize the irrigation and transportation engineering of the water in a desert.

The invention belongs to the field of new materials, and relates to the technical field of surface modification, and particular to a super hydrophobic aluminium alloy surface with wear resistance andheat resistance and a preparation method thereof. Aiming at the problem of poor mechanical durability of a super hydrophobic surface in the prior art, the technical scheme of the invention is that thepreparation method comprises the following steps: (1) performing pre-treatment on an aluminium alloy surface, namely, performing the pre-treatment on the aluminium alloy surface through a sand blasting process, and cleaning and drying the pre-treated aluminium alloy sample; and (2) soaking, namely, soaking the aluminium alloy sample which is treated by the step (1) in a perfluorooctanoic acid solution for performing surface modification, and drying to obtain the super hydrophobic aluminium alloy surface finally after the surface modification is completed. The preparation method is applicableto preparing super hydrophobic aluminium alloy materials in various fields, such as aerospace, navigation, bridges and buildings.

The invention discloses a preparation method of modified silicon dioxide obtained via super-hydrophobic modification. The preparation method comprises following steps: 1) a raw material A (a silicon dioxide base material, dry powder) is delivered into a mixer, a mixed state is maintained, a raw material C (a super-hydrophobic modification accessory ingredient prepared via mixing of 1.5% acetic acid aqueous solution and isopropanol at a mass ratio of 1-3:4-10) is atomized, and is sprayed into the mixed uniformly, and stirring is kept; 2) a raw material B (a hydrophobic modification agent organic silane coupling agent) is atomized, and is sprayed into the mixer uniformly, and stirring is kept; 3) aging is carried out; and 4) ultrafine grinding is carried out so as to obtain a finished product. Fewer processing steps are needed; energy consumption is low; requirements of industrialized large-scale production can be satisfied; particle size distribution of the modified silicon dioxide obtained via super-hydrophobic modification is uniform; pore structures are stable; and hydrophobic performance is stable. The prepared super-hydrophobic silicon dioxide prepared via the preparation method is taken as a flatting agent, and can be used for providing paint with super hydrophobic performance; film forming coating particle arrangement is uniform; and luster is soft.

The invention belongs to the technical field of superhydrophobic materials, and particularly relates to a preparation method of a highly transparent wear-resistant superhydrophobic composite coating. Surface-modified nano-silica powder prepared by a sol-gel method is dispersed in anhydrous ethanol to obtain a superhydrophobic coating solution. The surface of a substrate of stone, metal, glass and the like is coated with reactive-diluent-modified E-51 epoxy resin glue, standing is carried out for 1 to 2 hours at room temperature, the superhydrophobic coating solution is used for brushing to obtain the highly transparent wear-resistant superhydrophobic coating. The contact angle between the coating and water is 165 to 175 DEG, a rolling angle is 2 to 5 DEG, the light transmittance of coating glass in the 500 to 650nm is greater than 84%, and at pressure intensity of 2500 Pa, the contact angle between the coating and water is greater than 90 DEG after the coating is rubbed with 320-mesh sandpaper along a line. The preparation method of the coating is simple, environmentally friendly and low in cost, is suitable for the surface of glass, stone, ceramics, wood, metal and the like, and has a wide application prospect.

The invention relates to the field of super-hydrophobic surfaces. In order to solve the problems of poor binding force between the existing super-hydrophobic SiO2 micro-nano double rough structural layer and a glass substrate and insufficient hydrophobicity, the invention provides a preparation method of the super-hydrophobic surface of glass. The method comprises the following steps of: firstly, preparing fluorosilicone modified acrylic ester emulsion; secondly, preparing modified SiO2 sol; and finally preparing the super-hydrophobic surface of glass. The preparation method is simple and low in cost; a hydrophobic coating has excellent hydrophobicity and has excellent binding force with the glass; and the coating can maintain super-hydrophobicity for a long time.

The invention discloses a fully-organic multiply-fluorinated epoxy super-hydrophobic composite coating and a preparation method and a utilization method thereof. The coating comprises a coating system and a curing agent; the coating system comprises epoxy resin, polytetrafluoroethylene particles, polyperfluoromethyl isopropyl ether and an organic solvent; the curing agent is prepared by reaction of diethylenetriamine and perfluorobutyric acid. The preparation method includes preparation of the coating system and preparation of the curing agent. The utilization method includes: dissolving the curing agent into a diluent, adding an obtained curing agent solution into the coating system, well mixing, coating to a required surface and curing. The fully-organic multiply-fluorinated epoxy super-hydrophobic composite coating has advantages of excellent super-hydrophobic property, favorable abrasion resistance, water impact resistance, corrosion resistance, high adhesive power, wide application range and the like. The preparation method is simple and easy to implement and suitable for large-scale application.

The invention relates to a transparent super-hydrophobic film and a preparation method and application thereof. The transparent super-hydrophobic film comprises a zinc oxide film and a cetyl trimethoxysilane film loaded on the surface of the zinc oxide film, wherein the transparent super-hydrophobic film is 500 nm to 1000 nm thick, the visible light transmittance is 50% to 90%, the contact angle with water is 165 degrees or above, and the rolling angle with water is 2 degree or blow. The preparation method comprises the following steps: 1, preparing a zinc film by using the RF magnetron sputtering system, and then annealing the zinc film to obtain the zinc oxide film; and 2, modifying the zinc oxide film obtained in the step 1 to obtain the transparent super-hydrophobic film. The transparent super-hydrophobic film is used in building facades, window glass, optoelectronic devices or optical elements. The surface of the transparent super-hydrophobic film is of a nano-rod structure, and the film has excellent super-hydrophobic property, light transmission property, self-cleaning property and anti-fogging property, and can improve light transmittance of glass surface on rainy, snowy and foggy days and reduce glass surface stains.

The invention discloses a super-hydrophobic / super-oleophilic multilevel structure polyether sulfone oil-water separation membrane and a preparation method thereof and belongs to the technical field ofoil-water separation materials. The super-hydrophobic / super-oleophilic multilevel structure polyether sulfone oil-water separation membrane is prepared with two steps of a non-solvent induced phase method and a sol-gel method by taking polyether sulfone, silicon dioxide micro powder, tetraethyl silicate and hexadecyltrimethoxysilane as basic raw materials. The prepared super-hydrophobic / super-oleophilic multilevel structure polyether sulfone oil-water separation membrane has excellent super-hydrophobic property with a contact angle greater than 150 degrees, a rolling angle less than 10 degrees and an oil contact angle less than 10 degrees, has the characteristics of high porosity and high flux with the porosity reaching up to 79.59 percent and the flux reaching up to 2388.53L / h.m2, can effectively separate different kinds of water-in-oil emulsions as well as has the separation efficiency greater than 99 percent as for an emulsifier-free emulsion and greater than 98 percent as for an emulsifier-contained emulsion.

The invention discloses a super-oleophilic and super-hydrophobic coating and its preparation method and application. The super-oleophilic and super-hydrophobic coating is mainly made of raw materials in the following proportions by weight: 50-100 parts of volatile organic solvent, slightly hydrophobic 0.1-2 parts of nanoparticles, 0.5-2 parts of water-resistant resin, and 0.05-0.2 parts of curing agent. The contact angle of the textiles prepared by using the coating of the present invention with water is greater than 150°, and the contact angle with oil droplets is close to 0°, and the treated textiles have good mechanical properties, UV resistance, acid and alkali resistance, and have certain self-repairing functions. After repeated oil-water separation experiments, the separation efficiency still remains above 95%. At the same time, the preparation process is simple and easy, the process is easy to control, non-toxic and harmless, and can be used for large-scale production.

The invention discloses a super-hydrophobic coating. The super-hydrophobic coating comprises an inorganic layer and an organic layer which are alternatively coated on a substrate, wherein the inorganic layer is an inorganic nanoparticle layer, the organic layer is an organic silicone-modified polyurethane layer, and the bottommost layer and the topmost layer are organic layers. The invention further discloses a preparation method for the super-hydrophobic coating, and is not required for expensive materials and instruments, low in cost and convenient to apply, and capable of carrying out large-area application work; the prepared super-hydrophobic coating has the advantages of being super-high in hydrophobicity, high in transparency and durability, and free from the damage of corrosive liquid, and has no special requirement on the material of the substrate, and the used solvent is non-toxic, low in boiling points, and easy to volatilize, and no residuals exist after the coating is formed.