17 results about "Self-cleaning surfaces" patented technology

The invention relates to a preparation method of a hydrophobic and oleophobic PTFE membrane, and belongs to the technical field of PTFE membrane preparation. Aiming at the problems that an existing PTFE membrane is difficult to construct a micro-nano multi-stage coarse structure and has a synergistic effect with low chemical surface energy, the hydrophobic and oleophobic properties are insufficient and the structural stability is poor, the key points of the technical scheme provided by the invention are as follows: firstly, carrying out ethanol ultrasonic cleaning on a PTFE base membrane of 20-30 microns, and carrying out vacuum plasma treatment to form a nano coarse structure and oxygen-containing polar group active sites; then, under the protection of nitrogen, immersing into an ethanol solution containing perfluorodecyltriethoxysilane, dibutyltin dilaurate and nano cellulose whiskers, carrying out hot-pressing compounding with PET non-woven fabric, carrying out heat treatment, and finally, coating with a fluorine-containing polymer nano fiber layer through an electrostatic spinning process; the composite hydrophobic layer with the synergistic effect of a micro-nano multistage coarse structure and chemical low surface energy is formed, the water contact angle is larger than or equal to 155 degrees, and the oil contact angle is larger than or equal to 130 degrees. The PTFE film prepared by the preparation method can be used in the fields of waterproof breathable materials, self-cleaning surfaces, oil-resistant packaging and the like.

The application belongs to the technical field of functional coating materials, and particularly relates to a kind of super-hydrophobic solution based on fumed silica and its preparation method and application, comprising: step one, 20-200nm fumed silica nanoparticles are dispersed in ethanol / water mixed system, and sodium dodecyl benzene sulfonate is added to prevent agglomeration;Step two, under the catalysis of ammonia, tetraethyl orthosilicate and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane are added dropwise in sequence for fluorination modification;Step three, fluorinated silica nanoparticle suspension is prepared by ultrasonic-assisted reaction;Step four, the solution is sprayed onto the surface of ceramic substrate with micro-nano structure to form a coating;Step five, strong adhesion without adhesive is realized by mechanical anchoring effect.The application realizes super-hydrophobic performance of 153±0.5° high water contact angle and physical adhesion stability under 100-200g load by the synergistic effect of nanoparticle size effect and substrate surface topological structure, low surface energy of fluorinated alkyl chain and Cassie-Baxter air cushion layer effect, and is especially suitable for self-cleaning surface, anti-icing coating and marine corrosion prevention field.

The invention belongs to the technical field of composite materials and radomes, and particularly relates to a layer structure of a radome body and a manufacturing method. The skin comprises a first skin layer, an interlayer, a second skin layer and a polyvinyl fluoride film layer which are sequentially arranged from top to bottom. Through collaborative design of a micro-nano composite structure and a low-surface-energy material, a self-cleaning surface skin layer with super-hydrophobicity, high wave transmission and weather resistance is constructed. Compared with a traditional fluorocarbon coating, the wave transmission rate is 60-70% and is improved by more than 25%, the signal transmission loss is remarkably reduced, and the harsh requirement for the wave transmission performance of the antenna housing is met. The cleaning cost of a traditional antenna housing can be saved by more than 80%, especially for high-altitude and complex-structure antenna housings, high-altitude operation or special equipment is not needed, and the maintenance safety risk is reduced. The replacement frequency of the radome caused by aging and abrasion of the coating can be reduced, and the overall life cycle cost of equipment is reduced.

The application discloses a kind of composite super-hydrophobic paper based on alkyl ketene dimer and metal polyphenol network and preparation method thereof, belong to functional paper-based material field.The method is first immersed in 0.25%~5% alkyl ketene dimer emulsion in cellulose paper, is dried at 90~110 DEG C and is cured 48-96h to prepare modified paper;Then, the pH is 8.0-9.0 of tris-hydroxymethyl aminomethane hydrochloride buffer solution, hydrochloric acid dopamine is dissolved in the buffer solution to form dopamine solution, and the concentration is 0.25~20mg / mL of metal ion solution;Finally, the modified paper is immersed in dopamine solution and metal ion solution in turn, and is dried to obtain composite super-hydrophobic paper.The obtained composite super-hydrophobic paper uses cellulose paper-based material as substrate, and hydrophobic layer and metal polyphenol network layer are formed on the surface in turn, the composite paper has super-hydrophobic performance, water barrier performance and photo-thermal response performance, the preparation process is simple, and is suitable for waterproof packaging, self-cleaning surface, anti-icing and deicing and photo-thermal antibacterial and other fields.

The invention belongs to the technical field of photocatalysis and new energy materials, and particularly relates to a universal base material photocatalysis electron-proton migration channel material and a preparation and application method thereof. The material comprises a conductive functional base material, a proton migration channel layer and a photocatalytic heterojunction layer which are stacked in sequence, an electron transmission path and a proton channel capable of being continuously conducted are introduced to the surface of the conductive functional base material, so that directional migration of photo-induced electrons to the base material and migration of protons along a water film or the proton migration channel layer are achieved, and the photocatalytic performance of the material is improved. And a reduction reaction is carried out on a cathode interface. The material system can use broad-spectrum base materials such as aluminum, titanium, stainless steel, PI, FTO glass and a carbon fiber composite material, and different photocatalytic applications can be realized through different construction parameters. The system disclosed by the invention has the advantages of high photon-generated carrier separation efficiency, adjustable interface energy band, extensibility to large-area coating and the like, and is a general bottom layer technology which can be used for photocatalytic hydrogen production, VOC (Volatile Organic Compound) degradation, gas purification and surface self-cleaning.

The invention discloses a super-hydrophobic surface self-cleaning design method based on molecular dynamics simulation, relates to the technical field of super-hydrophobic surface self-cleaning and nanofluid, and discloses a process of impinging deposited liquid drops on a molecular level based on molecular dynamics (MD) simulation. By exploring the influence of various parameter groups, Weber number (We), droplet size ratio (0.5 < = delta < = 2) and wettability (theta0), the results of deposition, regular rebound, closed pore rebound, rupture rebound and the like are systematically mapped to a series of phase diagrams, so that the process of impacting deposited droplets by droplets wrapped with nano-particles is simulated; and parameters such as the droplet size ratio, the Weber number and the surface wettability are optimized by analyzing the dynamic behavior and the energy conversion mechanism of droplet collision, so that the deposited droplets are efficiently and quickly removed. The method is suitable for the fields of micro-nano systems, anti-icing coatings, self-cleaning surfaces and the like, and has the advantages of being flexible in design, low in energy consumption and high in cleaning efficiency.

The application discloses a novel flexible electric response liquid crystal polymer material and a preparation method thereof, and the novel material has the capability of reversible response to an electric field at room temperature. Existing electric response liquid crystal polymer materials often have a high glass transition temperature and need to be in a high-temperature environment to produce response to an electric field. In the application, the novel flexible electric response liquid crystal polymer material is generated by the reaction of a mono-acrylate monomer, a di-acrylate monomer and a chain transfer agent, has a glass transition temperature lower than room temperature, can produce reversible response to an electric field at room temperature, and has wide application prospects. The novel material can be used in many fields such as self-cleaning surfaces and touch displays in the future.

The invention discloses a high-threshold high-anti-reflection laser window and a manufacturing method thereof, and belongs to the field of micro-nano optical processing. According to the method, traditional precious metal and high-temperature annealing processes are abandoned, and low-melting-point soft metal is adopted as an evaporation film material. The method comprises the following steps: heating an optical substrate to 80-200 DEG C in a vacuum environment, maintaining the temperature, and carrying out at least two times of cyclic deposition by utilizing an electron beam evaporation technology; in each deposition, metal is self-assembled on the surface of the heating substrate through a dehumidification effect to form spherical nano-particles, the particles continue to grow on an original array through subsequent deposition, and finally the spherical nano-metal mask with high uniformity and high filling degree is obtained. And etching by taking the mask as a protective layer, transferring the appearance of the mask to the surface of the substrate to form a micro-nano structure, and cleaning to obtain the laser window. The method is simple in process, low in cost and suitable for large-area manufacturing, and the obtained window has the high laser damage threshold value, the high transmittance and the self-cleaning surface characteristic.

The application discloses a kind of super-hydrophobic fabric with self-cleaning and oil-water separation function and its preparation method and application, belong to functional textile technical field, including the following steps: after fabric base material is soaked in eutectic solvent and is carried out surface roughening etching pretreatment, in long-chain organosilane colloidal coating solution Impregnation reaction, after reaction, washing, drying, the super-hydrophobic fabric is obtained.The preparation process provided by the application is easy to obtain raw materials, simple equipment, easy to mass production.In addition, the super-hydrophobic fabric prepared by the application can maintain stable self-cleaning and oil-water separation performance, and has inherent advantages such as flexibility, air permeability and controllable porosity, and can be widely used in self-cleaning surface, oil-water separation filter material, outdoor antifouling material and other fields, with wide application prospect.

The invention relates to an optoelectronic module comprising a cover plate having self-cleaning surface properties. By implementing specific surface structures (e.g., periodic dot patterns and quasi-periodic wave structures) with precise structural depth / height and pitch (non-patterned regions), the present invention achieves a substantial reduction in dust adhesion. The present invention also introduces a direct laser interference pattern manufacturing method which allows the manufacture of an optoelectronic module comprising a cover plate having self-cleaning surface characteristics, which can ensure a high dust removal rate, thereby maintaining the performance and efficiency of the module for a long period of time.

The invention discloses a water-based long-acting super-hydrophobic coating and a preparation method thereof, and belongs to the technical field of surface functional materials and coatings. The hydrophobic coating comprises modified hydrophobic particles, an amphiphilic water-based binder, an auxiliary agent and a water-based dispersion medium, wherein the modified hydrophobic particles are inorganic or organic-inorganic composite micro-nano particles with hydrophobic low-surface-energy groups and hydrophilic or reactive functional groups on the surfaces at the same time, and the amphiphilic aqueous binder is an aqueous polymer material containing hydrophilic chain segments and hydrophobic chain segments at the same time. Stable dispersion of hydrophobic particles in a water phase is achieved, a low-surface-energy chemical structure and a graded micro-nano rough interface are synchronously constructed after film forming, the static water contact angle of the coating is not smaller than 150 degrees, the rolling angle is not larger than 10 degrees, and the coating has high adhesive force, excellent weather resistance and long-acting super-hydrophobic performance, is environmentally friendly and wide in applicable base material range and is suitable for large-scale production. The paint can be used for waterproof, antifouling, anti-icing, anti-corrosion and other self-cleaning surfaces.

The invention belongs to but not limited to the technical field of preparation of polymer functional fiber materials, and discloses a method for preparing a PMMA-PS (Polymethyl Methacrylate-Polystyrene) fiber film through ultrasonic and magnetic field composite assisted coaxial electrostatic spinning. The viscosity of PMMA and PS spinning solutions is reduced through ultrasonic vibration treatment, and the fluidity and spinnability of the PMMA and PS spinning solutions are improved; then applying a magnetic field in the electrostatic spinning process, and regulating and controlling the directional arrangement of molecular chains and the motion trail of jet flow by utilizing Lorentz force; and finally, through the synergistic effect of the two physical fields, the PMMA-PS fiber film with a spindle structure and high surface roughness is prepared. The ultrasonic-magnetic field composite assisted coaxial electrostatic spinning technology developed by the invention provides a new thought for preparing a high-performance super-hydrophobic functional material. The method has the advantages of being easy and convenient to operate, low in cost and easy to industrialize, and the prepared super-hydrophobic PMMA-PS fiber film has wide application prospects in the fields of self-cleaning surfaces, oil-water separation, anti-corrosion coatings and the like.

The present invention provides a preparation method for enhancing the hydrophobic properties of polyvinylidene fluoride (PVDF) materials. PVDF powder is directly dispersed in a mixed solution formed by water, and then subjected to hydrothermal treatment at a certain temperature to obtain a modified PVDF material with enhanced hydrophobic properties. Unlike conventional hydrophobic modification preparation methods, the advantage of the method of the present invention is that through a simple and easy-to-control hydrothermal treatment process, the surface structure of PVDF is regulated, the surface roughness is increased, and the surface contact angle of the material is changed, thereby achieving an improvement in the hydrophobicity of the PVDF material, thereby effectively increasing the material's anti-wetting properties. This method is simple, easy to operate, and easy to mass produce. The modified PVDF material can be applied to many fields such as self-cleaning surfaces, antifouling coatings, medical dressings, waterproof electronic products, and filter membranes to improve product performance.

A self-cleaning surface system comprising: one or more rotatable bodies (19); a support structure (3) supporting the one or more rotatable bodies, wherein the one or more rotatable bodies are configured to rotate about a corresponding rotation axis with respect to the support structure, the one or more rotatable bodies having a corresponding cleanable surface (1) parallel to the corresponding rotation axis configured to rotate from facing a first direction to facing a second direction with the corresponding rotatable body, and vice versa; a rotation mechanism; a cleaning mechanism comprising a cleaning fluid ejection mechanism; and an activation mechanism, wherein the cleaning fluid ejection mechanism, when activated, is arranged to eject cleaning fluid towards the one or more cleanable surfaces when the one or more cleanable surfaces face the second direction.

An optical element is provided that has an outer surface, the optical element including: a coating on the outer surface for causing any fluid thereon to form into fluid droplets; a plurality of independently activated electrodes each having a plurality of interdigitated fingers positioned proximate the outer surface and extending across an area of the outer surface; and a drive circuit for selectively applying signals to the plurality of electrodes. The AC signals applied to electrodes having adjacent fingers each have a phase shift such that fluid droplets are continuously swept in a predetermined direction across the outer surface. The electrode fingers may be arranged with a uniform pitch, where the pitch is the distance between the centers of the electrodes, the pitch being less than or equal to 750 μm??. The electrode fingers may be arranged in a single plane with gaps therebetween.

The utility model belongs to belong to the technical field of composite material and radome, specifically relate to a layer structure of radome body can carry out self -cleaning, the utility model discloses from top to bottom is sequentially arranged first skin layer, honeycomb interlayer, second skin layer and polyvinyl fluoride film layer. The utility model is through the synergic design of micro - nano composite structure and low surface energy material, constructs the self -cleaning surface skin layer with super - hydrophobic, high wave -transmitting, weather resistance. The utility model is more traditional fluorocarbon coating for wave -transmitting rate 60~70%, promotes 25% or above, signal transmission loss reduces significantly, satisfies the strict requirement of radome wave -transmitting performance. The utility model can save traditional radome 80% or above cleaning cost, especially to high altitude, complex structure radome, need not rely on high altitude operation or special equipment, reduces maintenance safety risk. The utility model can reduce the replacement frequency of radome due to coating aging, abrasion, and the overall life cycle cost of equipment is reduced.

The invention discloses a PVC (polyvinyl chloride) coated fabric structure, aiming at solving the problems of poor environmental protection property, insufficient mechanical property and weather resistance and single function of the existing PVC coated fabric. According to the structure, the prestress reinforced base cloth layer which is formed by blending basalt fibers and high-strength polyester and exerting prestress serves as a core framework; the two sides of the composite material are respectively in super-strong bonding with a functional bottom layer and a functional top layer which are made of non-phthalate environment-friendly plasticizers through high-bonding-force permeable layers containing organic coupling agents. The outer surface of the functional top layer is further coated with a super-weather-resistant self-cleaning surface treatment layer composed of a fluorine-containing polymer and nanometer titanium dioxide. The rare earth long afterglow material or the hollow glass beads are selectively compounded in the functional coating, so that the product is endowed with the characteristics of self-illumination at night, heat insulation, energy conservation and the like. The product is environment-friendly, non-toxic, high in mechanical strength, stable in size and long in weather-proof service life, and has the comprehensive advantages of self-cleaning, maintenance-free, firm interlayer bonding and the like.