554results about How to "Superhydrophobic" patented technology

The invention relates to a preparation method of a silicon-carbide-fibrofelt-enhanced silica aerogel composite material, and relates to an aerogel composite material. According to the invention, a carbon-rich silicon carbide micro-nano ceramic fibrofelt with small fiber diameter, high porosity, communicating pores, fast impregnation speed, and good compatibility with a substrate is prepared with a static electro-spinning technology combined with a precursor conversion method; a silica sol is prepared with an acid-alkali two-step method; with an infiltration technology, the electro-spun silicon carbide ceramic fibrofelt or precast is soaked into the sol; and through processes such as gel process, aging, curing, solvent exchange, supercritical drying, and the like, the silicon-carbide-fibrofelt-enhanced silica aerogel composite material is obtained. The prepared composite material has the characteristics of low density, large specific surface area, super-hydrophobicity, low thermal conductivity, and the like. The strength and toughness of the material are also greatly improved. The carbon-rich silicon carbide fiber has an infrared shielding effect, such that composite material thermal insulation effect and ultra-high-temperature stability can be improved.

The invention discloses a method for performing anticorrosive hydrophobic modification on the surface of an aluminum alloy, which belongs to the technical field of corrosion prevention. The method specifically comprises the following steps of: (1) performing surface degreasing and oil removing on an aluminum alloy material by using conventional alkaline degreasing solution first, performing surface activation treatment by using reductive acidic cleaning solution, and then performing inactivation and sealing treatments on the activated surface; (2) preparing a composition with a hydrophobic effect, wherein the composition consists of a first component and a second component in a weight ratio of 9-16:1, the first component is prepared from the following materials in percentage by weight: 35 to 60 percent of fluorocarbon resin, 10 to 40 percent of anticorrosive pigment, 1 to 8 percent of organosilicon compound, 0.5 to 5 percent of dispersing agent, 0.5 to 3 percent of anti-settle agent and 10 to 40 percent of organic solvent, and the second component is a fatty series / aromatic series curing agent; and (3) performing anticorrosive hydrophobic modification on the surface of the aluminum alloy, namely coating the composition with the hydrophobic effect in the step (2) on the surface of the aluminum alloy after treatment in a brush coating, spray coating or dip coating mode, and curing the surface for about 12 hours. The anticorrosive hydrophobic coating layer obtained on the surface of the aluminum alloy by using the technique of the invention has the advantages of thin coating layer thickness, high adhesive force, sea water corrosion resistance, surface super-hydrophobic property and the like.

The invention relates to a synthesis method for a visible photocatalyst by modifying titanium dioxide (TiO2) by using ammonium fluoride (NH4F). The synthesis method comprises three steps of: preparing a mesocellular foam silica (MCF) molecular sieve, preparing an MCF carrying TiO2 catalyst and modifying MCF / TiO2 by using the NH4F. Compared with the prior art, the carrying catalyst MCF / TiO2 is subjected to NH4F hydrophobic modification through a hydrothermal process and a low-temperature vacuum activation method; as a mesoporous material has extremely high absorption capability, the visible photocatalyst has outstanding absorption performance and catalyzing and degrading performance on ultraviolet and visible light of high-concentration organic pollutants during degrading of organic compounds, such as rhodamine B and the like; furthermore, during hydrophobic modification, if isopropyl alcohol is found to be a solvent, the NH4F hydrophobic modification effect of the prepared catalyst isthe optimal and the hydrophobic stability is quite good; moreover, the synthesis method is simple in operation and low in cost, and the raw materials are easily obtainable.

The invention discloses an anti-corrosion super-hydrophobic heat reflecting paint and a preparation method thereof. The anti-corrosion super-hydrophobic heat reflecting paint is prepared from the following raw materials: modified nano TiO2, modified nano SiO2, micron TiO2 and / or SiO2, fluorocarbon resin, a solvent, a curing agent, a defoaming agent, a wetting dispersant and a flatting agent. After experiments, the heat reflecting rate of the obtained product reaches 90 percent or more, the water contact angle reaches 145 degrees or more, and the product can meet the requirements on a coating under outdoor severe environments.

The invention provides a superhydrophobic silicon-aluminum-zirconium composite material and a preparation method thereof. The superhydrophobic silicon-aluminum-zirconium composite material comprises a silicon-aluminum-zirconium aerogel and a fiber material. The silicon-aluminum-zirconium aerogel is composed of the following components in percentage by mass: 30-95% of SiO2, 5-70% of Al2O3 and 0-10% of ZrO2. The method comprises the following steps: impregnating the fiber material into the silicon-aluminum-zirconium aerogel, and carrying out gel and supercritical drying treatment to obtain the superhydrophobic silicon-aluminum-zirconium composite material. According to the technical scheme, the obtained silicon-aluminum-zirconium composite material has the advantages of low vibration mass loss rate and stable structure at high temperature. The method has the advantages of simple technique, high controllability and low cost.

The invention provides a self-cleaning solar photovoltaic heat collection system based on the hydrophobicity of lotus leaves. The self-cleaning solar photovoltaic heat collection system based on the hydrophobicity of lotus leaves comprises a solar photovoltaic heat collection system body and an automatic cleaning system. The self-cleaning solar photovoltaic heat collection system based on the hydrophobicity of lotus leaves has the effects that the functions of power generation, heat collection, automatic cleaning and the like are achieved, automatic cleaning can be achieved through devices such as a pulley assembly and a spraying pipe according to the hydrophobicity principle of lotus leaves, and the utilization rate of solar energy is increased. Power stored in a solar photovoltaic panelis supplied to electric equipment such as a driving motor, a water pump and a controller, and thus no extra power supply is needed. A control hub is mounted in the system, and thus manual control canbe achieved in certain emergencies. Hot water and electricity used in the cleaning process are all supplied by the system, and thus the self-cleaning solar photovoltaic heat collection system based onthe hydrophobicity of lotus leaves accords with the concept of environmental friendliness, energy saving and sustainability.

The invention discloses a preparation method of a super-hydrophobic coating with a phase change function applied to the fields of a building exterior wall and a thermal insulation pipeline, and relates to the technical fields of coatings and general heat insulation. The super-hydrophobic phase-change coating with a micro-nano secondary structure is built by a composite water-based fluorine silicone acrylic emulsion, an organic phase-change microcapsule and nano particles. The fluorine silicone acrylic emulsion, the organic phase-change microcapsule, the nano particles, a defoamer and water are evenly mixed, and then dispersed by adopting a high-speed disperser or an ultrasonic crusher for 0.3-2 hours, so as to obtain the super-hydrophobic coating. The preparation method disclosed by the invention is simple, the prepared super-hydrophobic coating has heat-insulating and self-cleaning properties, and large-area construction is facilitated.

The invention discloses a preparation method of a gecko structure simulating adhesive and relates to a preparation method of a gecko foot simulating microarray. The preparation method of the gecko structure simulating adhesive, disclosed by the invention comprises the following steps of: (1) preparing a porous metal film by using a hydrogen bubble template method; (2) mixing a high polymer with a cross-linking agent, vacuumizing, pouring the mixed liquor on a template of the porous metal plate for curing; and (3) removing a base and the porous metal template by using chemical and electrochemical methods. The preparation method disclosed by the invention is easy to operate and needs no complex instruments; experiment parameters are controllable; and a prepared gecko foot simulating microarray structure has very high adsorption capacity, also can be easily separated from the absorptive surface and simultaneously has super-hydrophobicity and self-cleaning capability. For the gecko foot simulating microarray prepared by using the hydrogen bubble template method and taking porous metal as a template, the area is 0.1-5 square centimeters, the diameter is 0.5-100 micrometers, the height is 0.5-20 micrometers, the elasticity modulus of a material is 1-15GPa, and the shear strength is 1-150kPa.