15results about How to "Improve surface hydrophobicity" patented technology

This invention discloses a method for preparing a novel ultra-high voltage high-performance composite insulating material, belonging to the field of composite insulating material preparation technology. The technical solution includes the following steps: S1, preparing a modified epoxy-silicone rubber composite resin matrix: 40-50 parts by weight of bisphenol A type epoxy resin (E-51) are placed in a reaction vessel, heated to 60-70℃, and continuously stirred at a stirring rate of 300-500 r / min. 10-15 parts by weight of terminal hydroxyl polysiloxane (molecular weight 5000-10000) are added, and the temperature is kept constant for 1.5-2 hours; subsequently, the system temperature is lowered to 40-50℃. The beneficial effects of this invention are: by setting up a resin matrix system of "terminated hydroxyl polysiloxane modified epoxy resin + nano-alumina / boron nitride composite reinforcement," the problem of imbalance between high voltage resistance and aging resistance in existing materials is solved. It exhibits significantly improved dielectric strength, greatly reduced dielectric loss, and excellent high and low temperature cycling performance, meeting the long-life operation requirements of ultra-high voltage equipment.

The utility model discloses an aluminum honeycomb core composite board which comprises a composite board body, the composite board body is formed by combining an outer layer, a fireproof coating, a structure reinforcing layer, a first core layer, a first fireproof layer, a second fireproof layer, an inner layer, a waterproof layer, a second core layer and a bottom layer, the fireproof coating is fixedly connected to the lower surface of the outer layer, and the structure reinforcing layer is fixedly connected to the lower surface of the inner layer. Through the components, the composite board body is provided with multiple layers of fireproof and waterproof layers, ceramic treatment can be carried out at high temperature, a hard fireproof barrier is formed, double high temperature resistance can be achieved, flames and heat are prevented from permeating inwards, heat radiation can be reflected, and fire spreading can be delayed; the surface hydrophobicity of the composite board body can be high, the composite board body is resistant to rainwater corrosion, and the composite board body can still keep stable when exposed outdoors or in a humid environment for a long time.

The application provides an animal Bifidobacterium lactis HNU329 with the ability of reducing uric acid and an application thereof, the animal Bifidobacterium lactis HNU329 has been preserved in the Guangdong Microbial Culture Collection Center (GDMCC), the preservation address is the 5th floor of the 59th building of the courtyard, No. 100, Jiefang Road, Guangzhou, the preservation date is April 22, 2024, the preservation number is GDMCC No: 64546, and the classification and naming are Bifidobacterium animalis subsp. Lactis. The strain has good degradation abilities of nucleosides and purines in vitro, also shows good uric acid reducing ability and anti-inflammatory ability in animal model evaluation, and can regulate the intestinal flora of hyperuricemia mice and improve the symptoms of hyperuricemia. The strain is non-toxic and has no side effects, is safe, and has a wide application prospect.

The application provides an edible active coating for preventing dry consumption under an ultralow temperature condition and a preparation method, and belongs to the technical field of active packaging. The application combines double-layer coatings, inhibits free radical oxidation generated by freezing through an inner antioxidant, and effectively locks water and blocks external oxygen permeation through the synergistic effect of an outer high-barrier structure, thereby significantly improving the freezing preservation effect of food, and the raw materials are natural and safe, the preparation method is reasonable, and the application has good practical application value. The application solves the problems of poor effects of edible freezing protection coatings suitable for extremely cold environments in the prior art.

The utility model discloses a kind of color coating decorative aluminium profile, it is related to aluminium profile technical field, including aluminium profile assembly, aluminium profile assembly includes middle part support cylinder and reinforcing frame, the outside of middle part support cylinder is fixedly connected with first reinforcing rib, in the utility model, external load is first acted on reinforcing frame, pass through compression strip and is transferred to compression frame, and concentrated stress is dispersed as annular stress, support strip and connecting frame and support frame cooperate and resist the shear deformation of frame, radial load is obliquely conducted to middle part support cylinder through second reinforcing rib, utilize the torsional advantage of its cylindrical structure and disperse radial force, first reinforcing rib auxiliary converts radial force into annular tension, avoid middle part support cylinder partial compression instability, reinforcing pipe is installed in filling cavity, filling cavity is filled with anti-vibration material, improve axial compression resistance, form three-dimensional stress system, realize the layered transmission and dispersion of force.

This application provides a method for flotation separation of chalcopyrite and pyrite, relating to the field of mineral flotation. The method involves mixing and flotation of the minerals to be processed, including chalcopyrite and pyrite, with a chalcopyrite collector to obtain chalcopyrite concentrate and pyrite tailings. The general structural formula of the chalcopyrite collector is: [Formula omitted]. This chalcopyrite collector utilizes the high selective affinity of its propyne ester group for copper-active sites on the chalcopyrite surface and its inertness to iron sites on the pyrite surface, achieving precise identification and collection of chalcopyrite from the molecular structure of the reagent, significantly improving the grade and recovery rate of the copper concentrate. The R group is a hydrophobic group facing the pulp, significantly enhancing the surface hydrophobicity of the chalcopyrite particles, thereby enabling them to adhere to flotation bubbles and float.

This invention provides a chitosan-based edible film with a nano-network structure, its preparation method, and its application. The preparation method includes the following steps: 1) Adding zein to water, adjusting the pH, and then adding a phosphorylation reagent to obtain a mixed solution. After dialysis, centrifugation is performed, and the supernatant is freeze-dried to obtain phosphorylated zein nanoparticles; 2) Adding microcrystalline cellulose to FeCl3·6H2O solution, heating in a water bath, vacuum filtering, washing the precipitate until white, and freeze-drying the obtained precipitate to obtain cellulose nanocrystals; 3) Preparing a coating solution: Adding the phosphorylated zein nanoparticles and cellulose nanocrystals to a chitosan hydrochloride solution to obtain a coating solution; 4) Adding a plasticizer to the coating solution, ultrasonically degassing, and then pouring the mixture onto an acrylic plate to naturally form a film, thus obtaining an edible film. The chitosan-based edible film prepared by this invention can be used to reduce cherry cracking when exposed to rain. It is safe and non-toxic and has high market value.

The invention relates to the field of coating compositions, and particularly discloses an anti-icing self-cleaning coating material for a tower drum of a wind driven generator as well as a preparation method and application of the anti-icing self-cleaning coating material. The anti-icing self-cleaning coating material comprises a bottom coating material and a surface coating material, the bottom coating material contains fluorosilane, amino silane, ethyl acetate, butanone, filler, fluorocarbon resin and an isocyanate curing agent, the filler comprises alpha-Fe2O3 modified mesoporous SiO2 particles and hydroxylated boron nitride, and the surface coating material comprises fluorine modified SiO2 particles and acetone. The anti-icing self-cleaning coating material can achieve a good protection effect on the tower drum of the wind driven generator, the water contact angle of the surface of the coating is larger than 155 degrees, the water rolling angle is smaller than 5 degrees, the ice adhesion strength is smaller than 30 kPa, the water contact angle is still larger than 150 degrees after 20 times of freezing and thawing cycles, at the moment, the tower drum can better adapt to the low-temperature and high-humidity environment, the coating stripping possibility is low, and the anti-icing self-cleaning coating material can be applied to the wind driven generator tower drum. And the corrosion speed of the steel is reduced, so that the normal use time limit is longer.

This invention relates to ultra-high purity polyethylene, its preparation method, and its applications. Ultra-high purity polyethylene is prepared by the following method: homopolymerization of ethylene in the presence of a crackable polyolefin catalyst, or copolymerization of ethylene with an α-olefin comonomer, to obtain a polyethylene product; hydrolysis of the polyethylene product to remove the metal active centers of the catalyst; and washing of the hydrolyzed polyethylene product to remove impurities, thus obtaining ultra-high purity polyethylene. Compared with existing technologies, this invention utilizes a crackable polyolefin catalyst to efficiently remove metal active centers from the polymer through hydrolysis after ethylene polymerization, significantly reducing metal residues in the polyethylene product and obtaining ultra-high purity polyethylene. This is suitable for fields with extremely stringent requirements for metal impurity content, such as semiconductors, clean packaging, and medical implants.

This invention provides an in-situ passivation method for perovskite thin films, a perovskite solar cell, and a method for preparing the same. The in-situ passivation method includes: preparing a perovskite precursor solution comprising formamidinium cations, divalent metal cations, halide anions, and fluorobenzylamine, wherein the content of fluorobenzylamine is 0.01% to 1% of the molar amount of formamidinium cations; coating the perovskite precursor solution and annealing it to crystallize the solution and allow the fluorobenzylamine and formamidinium cations to react in situ, forming an in-situ passivated perovskite thin film. In this application, fluorobenzylamine is used to in-situ passivate the formamidinium-containing perovskite system, achieving mutual promotion between the passivation and crystallization adjustment processes. Furthermore, in-situ passivation suppresses ion migration, allowing the high-quality thin film structure composed of large grains to be maintained during long-term operation, ultimately achieving high device stability.

This invention discloses a magnesium-silica eco-friendly fireproof board and its preparation method. The board comprises a first active silica powder, lightly calcined magnesium oxide, modified phosphogypsum, a modified composite material, fly ash powder, citric acid, polyvinyl alcohol, quartz sand, diatomaceous earth, water, sodium tripolyphosphate, silane-modified polyimide powder, metakaolin, magnesium sulfate, and modified straw powder. The modified phosphogypsum is obtained by modifying phosphogypsum with lime; the modified composite material is obtained by combining sepiolite powder and zeolite powder, followed by sequential modification with a silane coupling agent and a second active silica powder; the modified diatomaceous earth is obtained by high-temperature activation of diatomaceous earth; and the modified polyimide is obtained by modifying polyimide with a silane coupling agent. This invention, through the synergistic effect of its components, effectively solves the problems of insufficient fire resistance and high-temperature resistance, poor moisture and water resistance, uneven structural strength, and poor splicing and sealing effects of traditional fireproof boards in underground integrated pipe gallery cable compartment scenarios. It combines excellent fire resistance, heat insulation, moisture and water resistance, structural strength, and splicing and sealing performance.

The application discloses a kind of high-strength waterproof board and preparation method thereof, it is related to plate technical field.The preparation method of the application includes the following steps: sequentially stack 1 steel plate, 2 base plates, 1 fingerprint-resistant polymer film on 1 fingerprint-resistant polymer film, then heat pressing solidification, after cooling, plate is taken out, and high-strength waterproof board is obtained;Wherein, base plate is prepared from modified kraft paper and modified color paper.The water resistance, fire resistance and bonding strength of the plate are effectively improved by modifying kraft paper with modified phenolic resin, hydrophilic silicon dioxide and other components;The bonding strength, water resistance and fire resistance of the plate are further improved by modifying color paper with melamine, vanillin, flame retardant DOPO, 3,4-dihydroxybenzaldehyde and other components.Therefore, the application has a more extensive application prospect.

The application discloses a kind of polylactic acid-based polyurethane and its preparation method and application, the polyurethane is with polyester polyol and L-lactide ring-opening polymerization to obtain diblock prepolymer, again with dicyclohexyl methane diisocyanate reaction and be prepared multi-block polyurethane;Wherein, the polyester polyol is PriplastTM 3238.The polyurethane body of the application has superior mechanical properties and excellent hydrophobic capacity, has excellent bonding performance after being used as adhesive and can be maintained bonding ability underwater.Solve the contradiction that existing polyurethane adhesive pollutes environment, the mechanical properties and adhesion of body cannot be taken into account, effectively prolong the service period of adhesive, make it show great application potential in many fields.

The application discloses a peanut skin extract / chitosan blended solution with antibacterial function and high mechanical property and application in fibers and films, and belongs to the technical field of functional textile materials. The peanut skin extract is prepared by using a solvent extraction method, and then the amino groups on the chitosan and the phenolic hydroxyl groups on the peanut skin extract are combined together through ionic crosslinking, so as to prepare the peanut skin extract / chitosan blended solution. Finally, the peanut skin extract / chitosan blended solution is spun into fibers or cast into films, so as to improve the mechanical property, hydrophobic property, antibacterial property and the like of the fibers and the films.

This invention relates to the field of cable technology and discloses a 220KV submarine cable resistant to deep-water pressure and its manufacturing method. The submarine cable is composed of a conductor, an insulation layer, a water-blocking tape, a sheath layer, a waterproof polypropylene tape inner lining layer, an armor layer, and a waterproof polypropylene tape outer sheath layer. This invention involves mixing polypropylene, polypropylene-modified silicone oil, and a lubricant, followed by extrusion, casting, stretching and orientation, and slitting. The resulting waterproof polypropylene tape exhibits good tensile strength, while significantly improving elongation at break and flexibility. The polypropylene-modified silicone oil contains strongly hydrophobic perfluoroalkyl chains and polysiloxane structures, which improves the water contact angle and surface hydrophobicity of the polypropylene tape, enhancing its waterproof performance. As the inner lining and outer sheath layer of the cable, it is beneficial for improving the cable's waterproof and water-resistant performance, and has good practical applications in submarine cables and other fields.