64results about How to "Achieve superhydrophobic effect" patented technology

The invention discloses a method for modifying microporous membrane wettability by utilizing a low pressure-forced Cassie state effect. The method comprises the step of: inducing a liquid drop on a microporous membrane with the aperture of 10-100 mu m to be changed from a Wenzel state to a Cassie state at the room temperature by utilizing relative pressure of 100-300 Pa, so as to modify interfacial wettability property of the microporous membrane. Before the implementation of the above-mentioned step, preferably, surface finish is performed on the microporous membrane by adopting a surface modification technology. Under a same micropore structure, the larger the contact angle of the liquid drop on the surface of the modified microporous membrane is, the smaller the critical pressure of the forced Cassie state of the microporous membrane is. The invention provides a novel approach for designing a superhydrophobic surface. Compared with the common superhydrophobic surface, the microporous membrane has the advantages of reducing the degree of dependence on a low surface energy substance and a surface micro-nano fine structure, and decreasing the probability of failure of the surface superhydrophobic function when external pressure and the surface fine structure are damaged, therefore wide application prospect is obtained.

The invention belongs to the field of preparation of hydrophobic materials, and particularly relates to a preparation method of hydrophobic nanocellulose. According to the preparation method of the hydrophobic nanocellulose, tannic acid or dopamine with good biocompatibility is used as a cross-linking agent, alkylamine is grafted to the surface of the nanocellulose through covalent bonds, an alkylamine-nanocellulose hydrophobic material is used as a hydrophobic coating, and after the hydrophobic coating is sprayed on the surface of a base material, on one hand, the chemical hydrophobic capacity of alkylamine is reserved, on the other hand, a coarse micro-nano structure is formed on the surface of the material in cooperation with nanocellulose, the good hydrophobic effect is achieved, the hydrophobic performance and durability are obviously improved, and the super-hydrophobic effect of the material can be achieved.

The invention discloses a method for preparing a super hydrophobic polymer composite coating containing nano particles. The method comprises the following steps: firstly, mixing a coupling agent with a hydrolysis promoter and deionized water to carry out hydrolysis at normal temperature; adding the nano particles, reacting at 50-100 DEG C for 0.25-5 hours under magnetic agitation, so as to obtain modified nano particle powder by post-treatment; sieving the modified nano particle powder, and mixing with a fluorine-containing polymer emulsion; and evenly agitating after diluting by a diluent, coating on a metal substrate, and cooling to room temperature after high-temperature solidification and annealing treatment. The invention proposes a simple method for preparing the super hydrophobic polymer composite coating containing the nano particles. The nano particles are modified by the coupling agent, meanwhile, the adjusting process of pH in the hydrophobic treating process of the nano particles is removed, the modified nano particles are added to the polymer composite coating, and the stable target is achieved by interaction of bonding of a nano particle-coupling agent and a fluorine-containing polymer molecular chain.

The invention provides an electrolyte for realizing blackening of a magnesium alloy surface and a blackening process method. A coloring solution of a silicic acid system is adopted, and the coloring solution comprises additives such as ferric ammonium citrate and the like. In the coloring process, a magnesium alloy is subjected to down-current two-step constant-current micro-arc oxidation treatment in a prepared micro-arc oxidation solution to prepare a black ceramic membrane. In order to further improve the corrosion resistance and the stability of a membrane layer, hole sealing treatment iscarried out in hole sealing liquid. The coloring micro-arc oxidation solution is safe, environmentally friendly and high in stability, by optimizing a micro-arc oxidation manner, positive and negativecurrent density parameters are adjusted, self-repairing hole sealing is carried out on the interior of the membrane layer, the problems that the surface is loose and porous, and the thickness of a compact inner layer is small are solved, membrane layer compactness control is achieved, the membrane layer is thicker and more compact, finally the hole sealing liquid is good in stability, the influence on the color of the membrane layer does not exist, and the corrosion resistance is improved. By means of the technology, blackening treatment of the magnesium alloy is achieved, and the applicationfield of the magnesium alloy is broadened.

The invention provides organosilicone-acrylate nanometer emulsion. The organosilicone-acrylate nanometer emulsion is prepared through the following steps that 1, nanometer zinc hydroxide is prepared; 2, organizing treatment is performed on the nanometer zinc hydroxide; 3, a mixed monomer is prepared and mixed with the organized zinc hydroxide to form a monomer mixture, and an initiator solution and an emulsifier solution are prepared; 4, the monomer mixture and an organosilicone monomer are processed through emulsion polymerization through the initiator and the emulsifier. The organosilicone-acrylate nanometer emulsion has the super hydrophobicity and the very good acid and alkali resistance.

The invention relates to a preparation method of a mushroom-shaped metal column array surface with a stratum structure. According to the preparation method, with a double-layer polycarbonate film withnano-holes and micron holes as a mold plate, a mushroom-shaped metal column array with the micro-nano stratum structure is prepared on the metal surface through an electroplating process. The mushroom-shaped metal column array has superhydrophobic performance after surface fluorination. According to the method, no expensive instrument equipment or complicated process procedures are needed, the method is simple and economical, the prepared surface micro structure is high in mechanical strength and high in durability, and the application field of super moistened surfaces can be extremely widened.

The invention discloses a production technology of hydrophobic bamboo wood with the surface being loaded with oxidized graphene and silicon dioxide, and relates to the technical field of composite materials. The production technology includes the following steps that S1, absolute ethyl alcohol, deionized water and ammonia water are collected to be poured into a beaker for stirring, so that a soak solution is prepared, and TEOS is added into the soak solution to obtain colloid; S2, the bamboo wood loaded with the oxidized graphene and the colloid in the step S1 are transferred into a reaction still to carry out a hydrothermal reaction; S3, after the hydrothermal reaction is completed, a bamboo block is taken out and cleaned with the deionized water, and then the bamboo block is put into a vacuum drying oven to be dried; S4, heptadecafluorodecyl trimethoxy-silane and methyl alcohol are mixed to be evenly stirred, so that mixed liquor is formed; S5, the bamboo block dried in the step S3 is put into the mixed liquor of the step S4 to be stirred; and S6, after stirring is completed, the bamboo block is taken out and is washed with the methyl alcohol, and then the bamboo block is put into the vacuum drying oven to be dried so that a product can be prepared. By the adoption of the production technology, the technical problem that bamboo wood prepared in the prior art cannot meet the hydrophobic requirement is solved.

The present invention relates to a method for preparing ultrahydrophobic high-molecular coating layer coated on the surface of solid by utilizing phase separation film-forming technique in the volatilizing process of noncrystalline high molecular in solvent under the normal temperature and normal pressure. Said method includes: dissolving noncrystalline high molecule in poor solvent at normal temperature, said solution concentration is 0.001-5 g / ml, then coating said poor solvent in which the noncrystalline high molecule is dissolved on the surface of solid to form film, making the solvent be volatilized and making noncrystalline high molecular soltue and poor solvent implement slow phase separation, finally forming rough ultrahydrophobic high-molecular coating layer on the surface of solid. Said invented ultrahydrophobic surface has good anticoagulant property.

The invention discloses a preparing method of a multifunctional oil-water separating material. The preparing method includes the following steps of S1, preprocessing a copper net to remove impuritieson the surface; S2, soaking the preprocessed copper net in a chloroauric acid solution for 1-2 hours to obtain a copper net loaded with Au / CuCl particles; S3, soaking the copper net obtained in the step S2 in a silver salt solution for 1-2 hours to obtain a copper net loaded with Au / AgCl particles on the surface; S4, modifying the surface of the copper net obtained in the step S3 through the PFDTto obtain the multifunctional oil-water separating material. The invention further discloses the multifunctional oil-water separating material prepared through the method and application of the material. The prepared multifunctional oil-water separating material can separate an oil-water mixture, can also detect low-concentration pollutants in oil-water mixed liquid and can effectively conduct photolysis on the pollutants.

The invention belongs to the field of new materials, and provides a preparation method of a super-hydrophobic and dust-proof stainless steel filter screen. The method comprises the steps: forming a gully-like structure on the surface of a stainless steel filter screen by etching, further attaching a super-hydrophobic and photocatalytic substance coating to obtain the super-hydrophobic filter screen. The filter screen has low surface energy and catalytic properties of nano materials, and can reduce the adhesion of dust, oils and dirt, catalyze the degradation of harmful gases, and has antibacterial activity, and can be used in air purification systems such as air purifiers and fresh air systems, and household filtering systems such as kitchen ventilator, refrigerators and air conditioners.The preparation method of the filter screen is simple, mild in reaction conditions and suitable for large-scale production.