13 results about "Biomimetic coating" patented technology

The invention discloses a preparation method of a high-temperature-resistant high-strength polyimide composite material, and relates to the technical field of polyimide composites.The preparation method comprises the following preparation steps that S1, a customized silane coupling agent is prepared; s2, preparing a bionic dynamic interface modified reinforcing filler, wherein the modified reinforcing filler is synergistically modified through a bionic coating and a customized silane coupling agent; and S3, preparing a polyimide precursor solution containing the dynamic network. According to the preparation method of the high-temperature-resistant high-strength polyimide composite material, through the integrated design of'customized silane coupling agent + bionic dynamic interface modification + dynamic network-containing polyimide precursor + gradient hot-pressing curing ', the glass-transition temperature of the prepared composite material is greater than or equal to 335 DEG C, the tensile strength is greater than or equal to 208 MPa, and meanwhile, the thermal repair efficiency at 180-250 DEG C is greater than or equal to 87%; the technical bottleneck that high temperature resistance, mechanical strength and repairing performance of the material are difficult to consider at the same time in the prior art is solved.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

This invention discloses a method for surface-modified biomaterials and a modified pericardial material, relating to the field of biomedical materials technology. The method includes the following steps: S1, providing animal pericardial material cross-linked with glutaraldehyde; providing a bridging molecule containing a first bridging group and a second bridging group, and a phosphorylcholine polymer with a third bridging group at its end; binding the first bridging group to an aldehyde group on the surface of the pericardial material via a first covalent reaction; binding the second bridging group to the third bridging group via a second covalent reaction, thereby achieving grafting of the phosphorylcholine polymer onto the material surface; the first covalent reaction and / or the second covalent reaction include Schiff base formation and reductive amination processes. The modified pericardial material prepared in this application introduces a phosphorylcholine biomimetic coating, which can improve blood compatibility on the material surface, reduce activation of the coagulation system and platelet adhesion, and inhibit the initiation of calcium ion deposition on the material surface, while exhibiting high safety.

The invention relates to the technical field of surface bionic micro-nano structures, in particular to a bionic rigid-elastic coupling microstructure anti-drag coating and a preparation method thereof. According to the preparation method of the bionic rigid-elastic coupling microstructure anti-drag coating, the hydrophobic property of polydimethylsiloxane (PDMS) and the inherent magnetic property of Fe3O4 or CIP are utilized, the bionic coating with the rigid-elastic coupling microstructure is prepared on a stainless steel substrate through a magnetic field induction method, and the bionic coating has good underwater self-adaptive anti-drag performance. When the surface of the coating is in a water flow environment, the surface is subjected to a certain water pressure, and the rigid-elastic coupling microstructure is subjected to self-adaptive deformation. Wherein elastic deformation can absorb a part of energy, the turbine effect of the microstructure can decompose a large turbine into small turbines, and the small turbines and the dynamic rigid-elastic coupling microstructure jointly act to cope with water flow changes and reduce resistance. And after the surface water pressure is reduced, the microstructure recovers to the original height, and meanwhile, a relatively low solid-liquid contact area is kept.

The invention discloses an ultraviolet crosslinking halogen-free flame-retardant cable material and a preparation method thereof. The cable material is prepared from an ethylene-vinyl acetate copolymer, a polyolefin elastomer, a reactive modified composite flame-retardant filler, a lubricant, an anti-dripping agent, a photo-crosslinking agent and a photoinitiator through microwave pretreatment, melt blending, ultraviolet irradiation and heat-assisted post-curing. Wherein the flame-retardant filler is constructed by biomimetic coating of aluminum hydroxide with polydopamine, modification with vinyl silane and chemical anchoring of melamine cyanurate and aluminum hypophosphite, and a'core-shell 'structure with a firm interface and crosslinking activity is formed. Through cooperation of filler interface engineering, flame-retardant system optimization and process innovation, the oxygen index of the material reaches 31.8-34.5%, the flame-retardant grade reaches UL94 V-0 grade, the tensile strength is kept at 17.5-19.8 MPa, the gel content exceeds 73%, the smoke density is remarkably reduced to 115-130 Ds, the comprehensive performance is excellent, and the material is suitable for a high-end cable insulating layer or sheath layer.

The application relates to a preparation method of a high-entropy alloy powder and a surface biomimetic ploughshare self-sharpening coating, which comprises the following steps: pretreating the surface of a base material 65Mn steel; preparing Al2FeCoNiCrW 0.5 The size of the high-entropy alloy powder is 200-300 meshes; a surface biomimetic coating is prepared by adopting a laser cladding method, high-energy-density laser beams are used to melt the high-entropy alloy powder and the surface material of the contacted base material together, a metallurgical reaction is caused, and finally, the cladding layer with excellent performance is formed by rapid cooling and solidification; wherein the back of the ploughshare is cladded to obtain a ribbed biomimetic anti-friction wear-resistant structure, and the front of the ploughshare is cladded to obtain a convex biomimetic anti-friction wear-resistant structure. The high-entropy alloy coating is prepared on both sides of the ploughshare blade by using the laser cladding technology, so that two biomimetic surfaces with different wear resistances are formed, the blade becomes sharper with wear, the self-sharpening effect is achieved, and the wear resistance and the anti-friction performance of the surface of the ploughshare are improved.

The invention provides a bionic miniature explosive ordnance disposal device for precise approaching type energy-gathered cutting of detonating electronic elements, and relates to the technical field of bionic unmanned aerial vehicles. According to the device, low-feature hidden approaching is achieved through wave absorption and bionic coating on the surface of a bionic fuselage; determining coordinates of a target element through infrared, satellite and visual multi-mode detection analysis; and the flight control module solves the attitude deviation of the fuselage and issues an alignment and operation instruction, and the attitude adjustment module corrects the attitude through differential deflection of the wings, so that the tail load is accurately aligned with the target. During operation, the telescopic mounting base is controlled to stretch out to build the optimal burst height, and the micro energy-gathered cutting module excites the transient energy generating medium to drive the metal shaped charge cover to turn over to form high-speed metal jet flow. According to the invention, integration of the miniature flight platform and the energy-gathered load is realized, deep cutting and local physical isolation of the core structure of the detonating element can be completed within microsecond-level time, and the explosive-handling safety efficiency and the operation precision are improved.

The invention discloses a method for surface modification of a biological material and a modified pericardium material, and relates to the technical field of biomedical materials. The method comprises the following steps: S1, providing an animal pericardium material subjected to glutaraldehyde crosslinking treatment; providing a bridging molecule comprising a first bridging group and a second bridging group, and a phosphorylcholine polymer terminal-modified with a third bridging group; combining the first bridging group with the aldehyde group on the surface of the pericardium material through a first covalent reaction; combining the second bridging group with the third bridging group through a second covalent reaction to realize grafting of the phosphorylcholine polymer on the surface of the material; the first covalent reaction and / or the second covalent reaction comprise Schiff base formation and reductive amination processes. According to the prepared modified pericardium material, the phosphorylcholine bionic coating is introduced, the surface blood compatibility of the material can be improved, blood coagulation system activation and platelet adhesion can be reduced, deposition starting of calcium ions on the surface of the material can be inhibited, and safety is high.

The utility model relates to nozzle cleaning technical field, and disclose a kind of self-cleaning function's jet aeration device nozzle, including aerator nozzle shell, the top of the aerator nozzle shell is provided with water inlet, the bottom of the aerator nozzle shell is provided with nozzle mouth;Cleaning assembly, the cleaning assembly is set to the inside and outside of aerator nozzle shell and water inlet. By being provided with rotating guide vane, water flow state can be optimized, aeration uniformity is improved, cooperate with helical guide plate to enhance water flow kinetic energy, improve aeration efficiency, then, water drive turbine drives micro rotary blade to scrape nozzle mouth inner wall impurity in real time, effectively prevent nozzle mouth blockage, cooperate with superhydrophobic biomimetic coating, reduce the adhesion of impurity and wall in water flow, so that impurity is difficult to adhere, reduce the risk of blockage, make subsequent cleaning more easily, achieve the effect of reducing blockage.

This invention relates to the field of biomimetic materials, and particularly to a blood contact material, a biomimetic coating, its construction method, and its applications. The active ingredient in the blood contact material is formed by polymerizing vinyl lysine, oligoethylene glycol methyl ether methacrylate, and vinyl dopamine. The blood contact material is dissolved in a first buffer solution with a pH value of 7.5-9 to obtain a coating solution. The substrate is immersed in the coating solution for a first time and then removed, allowing the substrate surface to be covered with an intermediate coating. The polymerized poly(oligoethylene glycol methyl ether methacrylate) segments can form a dense hydration layer providing antifouling functionality. The polylysine segments can specifically bind plasminogen and tissue-type plasminogen activator, dissolving primary thrombi. The polydopamine segments have adhesive properties, improving the substrate's versatility and facilitating coating formation. The blood contact material can mimic the antifouling and fibrinolytic functions of the vascular endothelium, contributing to a comprehensive antithrombotic effect.

The utility model relates to textile fabric technical field discloses an anti -ultraviolet curtain, including connecting post, the outer wall left and right sides of connecting post all are fixedly connected with baffle, the outer wall sliding connection of connecting post has two protective curtains, the inner wall back of two protective curtains all is provided with lotus leaf bionic coating, the front side of two lotus leaf bionic coating all is provided with nano silver ion antibacterial layer, the front side of two nano silver ion antibacterial layer all is provided with waterproof antibacterial layer, the front side of two waterproof antibacterial layer all is provided with wormwood fibre layer, the front side of two wormwood fibre layer all is provided with nanometer titanium dioxide coating layer. In the utility model, through connecting post and baffle cooperation, guarantee the stable sliding of protective curtain, make the curtain open and close smoothly, lotus leaf bionic coating effectively waterproof, reduce the influence of water vapor to curtain and indoor environment, nano silver ion antibacterial layer and waterproof antibacterial layer cooperation, restrain the bacteria breeding, have promoted the sanitary degree of curtain.

The utility model relates to the technical field of textile fabrics, in particular to a waterproof textile fabric, which comprises a fabric main body consisting of a water-repellent outer layer, a dredging interlayer and a moisture-absorbing inner layer, the water repellent outer layer and the moisture absorption inner layer are respectively adhered to the upper side and the lower side of the dredging interlayer through materials, air holes which are uniformly distributed are formed in the moisture absorption inner layer, and the bionic coating is coated between the textile bottom layer and the bionic coating. Gas exchange between the upper breathable layer and the lower breathable layer is achieved through natural gaps of fiber pieces of the upper breathable layer and the lower breathable layer, the heat preservation layer is filled between the upper breathable layer and the lower breathable layer, the heat preservation effect can be achieved while micro-breathability is guaranteed, expensive materials are avoided through combination of conventional materials and basic processes, and the production cost is effectively reduced. And more people can use the textile fabric with better functionality.

The invention relates to the technical field of sensor bionic coatings, in particular to an anti-biological-pollution nano bionic coating and a preparation method and application thereof.The preparation method comprises the steps that a stainless steel substrate is sequentially polished, cleaned and subjected to plasma treatment, and the activated substrate is obtained; preparing a substrate with a bionic micro-nano composite structure; preparing a substrate with nanoparticles; preparing a substrate with an amino silane transition layer; preparing a substrate with a dynamic Schiff base structure; and soaking the substrate in a sodium cyanoborohydride solution for 1-2 hours, taking out the substrate, performing heat treatment, cleaning the substrate again, and blow-drying the substrate with nitrogen to obtain the substrate with the nano bionic coating. By adopting the steps, the spirulina polysaccharide, the polyethylene glycol and the rare earth doped nanoparticles in the bionic coating have good biocompatibility, no toxic and harmful substances are released, the detection object of the biosensor cannot be interfered, and secondary pollution cannot be generated.