72results about How to "Avoid degradation of mechanical properties" patented technology

The invention relates to a preparation method of a large-diameter aluminum alloy tube, relating to a preparation method of an aluminum alloy tube and aiming to solve the problems in the prior art that the large-diameter aluminum alloy tube with the tube wall thickness less than 2mm and with an excellent performance cannot be prepared with low cost and high production efficiency. In the method, an aluminum alloy rolled plate is obtained at first through blanking with a plate shearing machine, a cylindrical tube blank is prepared with a plate rolling machine, a tube blank to be welded is obtained through clamping with a clamp, mixing friction welding is carried out for welding, a cylindrical welded tube is obtained through rounding, and the large-diameter aluminum alloy tube is obtained finally sequentially through spinning and thermal treatment. The invention has the advantages that: 1, a high-quality spinning blank can be obtained; 2, a large-diameter tube can be prepared; 3, the mechanical properties are good; 4, the number of spinning procedures is reduced, no annealing treatment is needed in the procedures, the production cycle is shortened, and the cost is decreased; and 5, the dimensional accuracy is high. The method is mainly applied in production of the large-diameter aluminum alloy tube.

A process for making a fluid processing module is provided wherein a plurality of filtration elements is alternated with a fluid porous layer to form a stack. The filtration elements comprise a membrane sheet having a thermoplastic element bonded to a portion of an edge of the membrane. An opening is provided either through the membrane or through the thermoplastic element. A portion of the thermoplastic element extends into the opening and can be sealed to an adjacent positioned thermoplastic element to seal the porous sheet positioned between adjacently positioned membranes from fluid communication with the opening. Sealing can be effected by extending a heating element through the opening of the stack to effect simultaneous sealing of a plurality of thermoplastic elements.

The invention relates to a polyimide film sintering powder and mica tape winding copper flat wire and a preparation method thereof. Two layers of insulation materials are wound outside a metal wire, the inner layer is a sintered polyimide film, and the outer layer is a mica tape. The electromagnetic wire has good voltage and heat resistance, high mechanical strength and strong corona resistance. The preparation method comprises the following technical routes: conductor straightening, conductor polishing, film winding, high-frequency heating, melting, adhesive sealing, mica tape winding and rolling. The invention integrates the production technical routes by improving a high-frequency device, a mica winding device and other devices, the quality of the copper flat wire is ensured, meanwhile, the mechanical property of the copper flat wire is increased, the production flow is shortened, and the production efficiency is increased. The invention is suitable for composite insulation winding coils of large-sized motors and electric appliances, such as wind driven generators, and the like.

The invention provides a polymer melt shear vibration extrusion molding device which comprises an extruding machine 13, an extrusion head 1 connected with the extruding machine through a flange plate, a mouth mould 12, a stock mould 14, a cooling water tank 15, a traction device 16 and a cutting device 17, and is characterized by further comprising a crank connecting rod shear vibration system 18 and a melt runner vibration chamber 2, wherein the crank connecting rod shear vibration system 18 is arranged above the extrusion head 1; the melt runner vibration chamber 2 is arranged inside the extrusion head 1; the crank connecting rod shear vibration system is composed of a crank connecting rod mechanism and a reciprocating vibration rod 3; the reciprocating vibration rod 3 is positioned in a through hole 9 formed in the extrusion head 1; the through hole 9 is communicated with the melt runner vibration chamber 2. The device provided by the invention not only can simultaneously promote polymer molecule chain orientation, shish-kebab structure generation and polymer crystalline grain refinement, and improve mechanical property of products, but also can reduce extrusion resistance and improve production efficiency.

The present invention relates to a high thermal conductivity acrylic fiber and a preparation method thereof. The high thermal conductivity acrylic fiber is prepared by adding graphene concentrate during the dissolving of polyacrylonitrile to uniformly disperse the graphene in the polyacrylonitrile spinning stock solution, and conducting wet spinning on the stock solution. The method is as below: first mixing, heating and stirring polyacrylonitrile, graphene concentrate and solvent according to weight ratio until complete dissolution of polyacrylonitrile, and then filtering and removing bubbles to obtain polyacrylonitrile spinning stock solution; and finally conducting wet spinning on the stock solution to obtain the high thermal conductivity acrylic fiber. The high thermal conductivity acrylic fiber contains uniformly dispersed specially treated ultrafine graphene, and the treated graphene have uniform particles, few layers and high activity, does not generate agglomeration phenomenon during addition, and can be well combined with the polyacrylonitrile, thereby significantly improving the thermal performance of acrylic fiber.

Provided is a self-repairing energy generating element using a shape memory polymer, including a first electrode; a shape memory friction layer made of the shape memory polymer on the first electrode and having a microbump pattern formed on a surface thereof; a second electrode disposed apart from the shape memory friction layer; and an opposing layer formed on the second electrode and configured to face the shape memory friction layer.

The invention provides a method for improving Seebeck coefficient of a carbon fiber cement-based composite material. According to the method, Fe2O3 and/or Bi2O3 powders are added during preparing the carbon fiber cement-based composite material; a linear relation is generated between the thermoelectromotive force and the temperature difference of the carbon fiber cement-based composite material, and the Seebeck coefficient of the carbon fiber cement-based composite material is increased along with the increasing of the quantity of added Fe2O3 and/or Bi2O3 powders, so that the obtained carbon fiber cement-based composite material is high in Seebeck coefficient, stable in thermoelectric property, high in mechanical property, and simple in preparation technology, and avoids the problem that the Seebeck coefficient of the composite material is unstable due to the application of lightweight aggregate, steel slag or crystalline flake graphite; the carbon fiber is free from the technical processing of bromine intercalation, so that the problem due to environmental pollution caused by bromine vapor can be avoided, and the problem that the mechanical property of the cement-based composite material is reduced due to adoption of the lightweight aggregate, the steel slag or the intercalation crystalline flake graphite also can be avoided; and the cement-based composite material can be uniformly dispersed in a cement matrix.

The invention discloses a method for preparing a silk fibroin sodium alginate composite fiber and belongs to the technical field of natural macromolecule composite materials. The method comprises thefollowing steps: firstly, mixing, stirring and dissolving silk fibroin with water, performing dialysis, and performing centrifugal separation so as to obtain a pretreated silk fibroin solution; mixingelastinase and the pretreated silk fibroin solution, adjusting the pH value, and performing constant-temperature stirring enzymolysis so as to obtain enzymatic hydrolysate; mixing phospholipid with the enzymatic hydrolysate, performing ultrasonic dispersion, further adding sodium alginate, plant essential oil and monosaccharide, performing a constant-temperature stirring reaction so as to obtaina reaction liquid, mixing the reaction liquid with Carbomer, performing a constant-temperature stirring reaction so as to obtain a spinning solution, performing vacuum defoaming, spinning, washing with water, and performing traction, coiling and drying, thereby obtaining the silk fibroin sodium alginate composite fiber. The silk fibroin sodium alginate composite fiber prepared by using the methodhas good mechanical properties.

Aiming to solve the problems that the mechanical property of the implant is reduced and that the mineralization bone is not easily formed in the implant existing in the technology for preparing the biomedical porous implant, the invention provides a biomedical porous implant and a method for preparing the same. The method comprises the following steps of: interweaving threads of the implant material to form a netty structure; pressing the netty structure into an implant coarse blank with a special shape; sintering the implant coarse blank so as to allow the material threads at cross points in the netty structure to form melting connection to prepare the implant. The plantation body prepared by the method can be used for preparing biomedical porous nickel-titanium alloy implants such as denda, artificial joints and the like and realizing the deep freezing treatment of hemangioma, ecphymata and keloid by carrying liquid nitrogen.

The invention discloses a three-dimensional carbon nanophase composite reinforced aluminum-based material and a preparation method thereof. The preparation method comprises the steps of firstly, immersing aluminum powder into ethanol solutions containing bisphenol A diglycidyl ether and nickel nitrate hexahydrate, magnetically stirring, and dropwise adding ethylenediamine to obtain the aluminum powder with the surface treated; then, mixing the aluminum powder with the surface treated after reduction and graphene oxide, and ball-milling the mixtures at low speed, and obtaining the aluminum powder coated with three-dimensional carbon nanophases after reduction; and finally performing SPS sintering and cold-rolling for the aluminum powder to obtain the three-dimensional carbon nanophase composite reinforced aluminum-based material. The preparation method is simple process, easy in operation and low in cost; according to the obtained composite reinforced aluminum-based material, through construction of the three-dimensional carbon nanophases, the load transfer efficiency is improved, so that the mechanical property of the aluminum-based composite material is improved obviously; the aluminum-based material not only is high in tensile strength, but also remains higher elongation and toughness, and is high in generalizability.

The invention discloses a heat-resistant and crack-resistant polyethylene material for a water horse. The heat-resistant and crack-resistant polyethylene material comprises the following raw materialsin parts by weight: 150-200 parts of a mixed main material, 70-90 parts of a composite filler, 20-25 parts of maleic anhydride grafted polyolefin, 20-30 parts of microcapsulated red phosphorus, 15-20parts of melamine, 6-8 parts of silicone powder, 7-9 parts of epoxidized soybean oil, 5-7 parts of Si69, 1-1.5 parts of vinyltriethoxysilane, 8-1.2 parts of double 25, 0.6-0.8 part of stannous octoate, 0.5-1 part of an anti-aging agent 264 and 1-1.5 parts of UV-531. The heat-resistant and crack-resistant polyethylene material provided by the invention is good in heat resistance, high in toughnessand good in crack resistance.

The invention provides an intrinsic conductive elastomer, a preparation method thereof and a flexible device. The structural formula of the intrinsic conductive elastomer is shown in the specification, R1 comprises hydrogen or methyl, R2 comprises an ester group or phenylene, R3 is-(CH2) m-or-(CH2CH2O) n-, and m and n are respectively and independently positive integers from 1 to 8; and X< + > is an imidazole cation, a pyridine cation, a pyrrole cation, a piperidine cation, a quaternary ammonium cation or a quaternary phosphonium cation, and Y <-> is any one of a chloride ion, a bromide ion, a tetrafluoroboric acid ion, a hexafluorophosphate ion or a bis (trifluoromethylsulfonyl) imide anion. The preparation method of the intrinsic conductive elastomer comprises the following steps: mixing the raw materials including the functional ionic liquid monomer, the comonomer, the cross-linking agent and the initiator, and reacting to obtain the intrinsic conductive elastomer. The raw material of the flexible device comprises the intrinsic conductive elastomer. The intrinsic conductive elastomer has the characteristics of high tensile property, high transparency and excellent stability.

The invention relates to the field of electrochemical electrode preparation, and especially relates to an electrode. The electrode comprises a matrix and an active layer, and the matrix is any one ofa titanium matrix, a copper matrix, a nickel matrix and graphite or carbon nanofibers; and the active layer is any one of a ruthenium-iridium active layer and a graphene active layer. The electrode prepared by taking any one of the titanium matrix, the copper matrix, the nickel matrix and graphite or carbon nanofibers as the matrix and taking the ruthenium-iridium active layer or the graphene active layer as tje active layer has high activity and high stability. Compared with a common electrode, the electrode has better electrocatalytic activity, and the electrocatalytic activity is shown as rising of oxygen evolution potential and lowering of chlorine evolution potential.