349results about How to "Good toughness strength" patented technology

The invention relates to a high thermal conductivity resin composition and a high thermal conductivity coated metal foil board manufactured by using the same. The high thermal conductivity resin composition comprises the following components of: epoxy resin, at least one phenoxy resin or carboxy terminal butadiene acrylonitrile, biphenyl phenolic resin and a high thermal conductivity packing material, wherein the biphenyl phenolic resin has the structure shown in the specification. The high thermal conductivity coated metal foil board manufactured by using the high thermal conductivity resin composition comprises a high thermal conductivity adhesive film and metal foils coated on both sides of the high thermal conductivity adhesive film, wherein the high thermal conductivity adhesive film comprises a carrier film and the high thermal conductivity resin composition coated on the carrier film, and the carrier film is a polyester film or a polyimide film. The high thermal conductivity coated metal foil board comprises a resin composite metal foil and a metal foil or another resin composite metal foil coated on the previous resin composite metal foil, and the resin composite metal foil comprises a metal foil and the high thermal conductivity resin composition coated on the metal foil.

The invention relates to high-temperature resistant flame-retardant epoxy glue and a preparation method of the high-temperature resistant flame-retardant epoxy glue. The epoxy glue is a double-component epoxy glue; when the epoxy glue is used, a first component and a second component are mixed in a weight ratio of 4:(2-3); the first component is prepared from the following raw materials in parts by weight: 30-50 parts of polyfunctional epoxy resin, 5-15 parts of low-viscosity epoxy resin, 3-10 parts of an active toughening agent, 10-30 parts of temperature-resistant reinforcing fillers, 10-15 parts of flame retardant and 0.3-3 parts of antioxidant; the second component is prepared from the following raw materials in parts by weight: 70-95 parts of a temperature-resistant curing agent, 10-30 parts of temperature-resistant reinforcing fillers and 0.3-1 part of a coupling agent. Compared with the prior art, the high-temperature resistant flame-retardant epoxy glue has the advantages of high high-temperature toughness, high adhesion strength, high flame retardant performance and the like.

The invention belongs to the technical field of high polymer composite materials and relates to a carbon fiber reinforced toughened epoxy resin composite material and its preparation method. The high polymer material is prepared from the following components, by weight, 100 parts of epoxy resin, 8-120 parts of a curing agent, 0.5-1.5 parts of a promoter, 160-500 parts of carbon fiber and 5-55 parts of thermoplastic. According to the invention, engineering thermoplastic is selected as a flexibilizer, and an appropriate solvent is selected; the engineering thermoplastic is made into a solution, and the solution is uniformly mixed with epoxy resin, the curing agent and the promoter; the solvent is removed; the resin system with the solvent removed is made into a resin film; by a routine resin film melt impregnation method, the resin film and carbon fiber undergo hot melting to be combined so as to prepare a carbon fiber reinforced epoxy resin prepreg; and furthermore, the highly-toughened carbon fiber reinforced toughened epoxy resin composite material is prepared.

The invention relates to a thermal preparation method of a solution of a self-supported porous graphene-based membrane, relates to a preparation method of a self-supported porous graphene-based membrane, and aims to solve the technical problems that the size and the thickness of a conventional self-supported porous graphene-based membrane are limited and the electrochemical performance of the conventional self-supported porous graphene-based membrane is poor caused by severe interlay lamination of graphene sheets in the chemical reduction process. The thermal preparation method comprises the following steps: dispersing graphene oxide into water, adding or not adding a doped carbon material, concentrating, and spreading into a membrane, thereby obtaining a graphene oxide membrane; preparing a thermal treatment solution by using acid or alkali solute, putting the graphene oxide membrane into a reaction kettle with a polytetrafluoroethylene lining, adding the thermal treatment solution according to the standard that the membrane is submerged, sealing the reaction kettle, and subsequently performing thermal treatment, thereby obtaining the self-supported porous graphene-based membrane. The self-supported porous graphene-based membrane is prepared by orderly arranging graphene sheets in parallel, and due to the gaps among the graphene sheet layers, the self-supported porous graphene-based membrane can be used in electrochemical energy storage devices such as supercapacitors.

The invention discloses a graphene/carbon nano tube/graphite film composite material and a preparation method thereof. The composite material is formed by performing composite molding on a graphene layer, a carbon nano tube layer and a graphite film through a rewinding machine and has high heat-conducting property; the novel composite material has extremely high heat-conducting coefficient in the three-dimensional direction, and heat centralized to one point can be rapidly conducted to a composite heat-conducting plate, so that the temperature of a heat source in an electronic device is reduced, and the composite material has high flexibility, machinability, electro-magnetic interference (EMI) shielding property and absorption characteristics. Moreover, the preparation process is simple, the cost is low and the composite material is suitable for industrial production.

The invention discloses a sliver-oxide ternary alloy electrical contact material and a production method thereof. The sliver-oxide ternary alloy electrical contact material comprises, by weight percent, 6%-24% of total ternary alloy oxides, 0.72%-5% of total added element oxides, and the balance of silver. The production method includes smelting the raw materials to obtain ingots by stepwise smelting process or atomizing to produce alloy powder; performing rolling and temperature differential oxidation, or high energy ball milling and temperature differential oxidation; and performing isostatic pressing to obtain primary ingots, subjecting the primary ingots to sintering, hot re-pressing and hot extrusion to obtain wires or strips, and thereby obtaining highly dispersible organizational structure with even and small crystal grains. The obtained material is high in conductivity, low in temperature rise, high in welding resistance, high in arc suppressing and high in electric corrosion resistance, electrical life is prolonged greatly, advantages of comprehensive property are highlighted, and the demands of high-end low-voltage electric appliances are fully met.

The invention discloses a preparation method for a flexible inorganic/organic composite proton exchange membrane. The method comprises the following steps: 1, dissolving a proton conducting polymer in an organic solvent or water so as to obtain a proton conducting polymer solution; 2, mixing an inorganic proton conducting material or an inorganic proton conducting material containing organic components with the proton conducting polymer solution for mechanical ball milling so as to obtain a mixture in which the inorganic proton conducting material or the inorganic proton conducting material containing organic components disperses in the proton conducting polymer solution; 3, pouring the mixture on a substrate, and allowing the solvent to volatilize and the mixture to solidify so as to prepare the flexible inorganic/organic composite proton exchange membrane. The flexible inorganic/organic composite proton exchange membrane prepared in the invention has the characteristics of proton conducting capacity, flexibility, stable dimension, heat resistance and mechanical strength at a certain degree, and can be used in the field of fuel cells and related fields in need of proton exchange membranes like all-vanadium redox flow batteries, industrial electrolysis of chlor-alkali, super capacitors and sensors.

The invention discloses a touch LCD screen, which comprises an upper substrate, a lower substrate, and a liquid crystal layer, wherein the upper substrate comprises a touch screen; the lower substrate and the upper substrate are oppositely arranged; the lower substrate comprises a thin film transistor panel; the liquid crystal layer is arranged between the upper substrate and the lower substrate; and a conducting layer of the touch screen comprises a carbon nanotube layer.

The invention relates to a zirconia composite alumina ceramic sintered body. The zirconia composite alumina ceramic sintered body comprises the following components in percentage by mass: 0.01-19.0 wt% of a zirconium-containing compound (calculated in the form of zirconium oxide), 0.01-1 wt% of a yttrium-containing compound (calculated in the form of yttrium oxide), 0.16-4.6 wt% of a silicon-containing compound (calculated in the form of silicon oxide), 0.035-1.0 wt% of a calcium-containing compound (calculated in the form of calcium oxide), 0.07-2.0 wt% of a magnesium-containing compound (calculated in the form of magnesium oxide) and the balance of aluminum oxide. According to the zirconia composite alumina ceramic sintered body, 3Y-ZrO2 is taken as an additive, and the synergistic effect of multiple toughening modes such as phase change toughening, microcrack toughening, internal crystal structure strengthening toughening and surface strengthening toughening is achieved; CaCO3, SiO2and MgO are used as sintering aids, the sintering temperature of the aluminum oxide ceramic is reduced through liquid-phase sintering, the sintering rate is increased, sintering densification is promoted, and an aluminum oxide substrate prepared from the zirconia composite alumina ceramic sintered body has good fracture toughness and bending strength.

The invention provides a method for synthesizing unsaturated polyester resin by utilizing PET. The method comprises the following steps that 1, glycerol, dihydric alcohol with the boiling point exceeding 210 DEG C, waste PET and a catalyst are added and stirred at the speed of 250-300 r/min, under nitrogen protection, the temperature is raised to 210 DEG C to carry out a heat preserving reaction, after alcoholysis is carried out on PET completely, the temperature continues to be kept for 1-2 h, and cooling is carried out; 2, the temperature is lowered to below 150 DEG C, unsaturated dicarboxylic anhydrides, monohydric alcohol and residual dihydric alcohol with the boiling point lower than 210 DEG C are added, the temperature is raised to 150 DEG C-155 DEG C for carrying out the heat preserving reaction for 0.5 h, then the temperature is raised to 195 DEG C-200 DEG C step by step to carry out the constant temperature reaction, when the water yield reaches 85-90% of the theoretical amount, vacuumizing is carried out to force water to be drained, and the reaction is carried out until an acid value is smaller than 25 mgKOH/g; 3, the temperature is lowered to 155 DEG C-160 DEG C, a proper quantity of polymerization inhibitor is added, styrene is used for diluting, and cooling and filtering are carried out to obtain a finished unsaturated polyester resin product. According to the method, after being cured, the prepared resin has good toughness and physical strength, overcomes the defect of poor solubility of polyester and styrene, and is economical and environmentally friendly.

The invention belongs to the technical field of high-molecular materials, and relates to a tough epoxy resin curing system and a preparation method thereof. The high-molecular material is prepared from the following compositions in parts by weight: 100 parts of epoxy resin, 8-120 parts of a curing agent, 0-1.5 parts of a promoter and 5-55 parts of thermoplastic. High-toughness high-heat-resistance thermoplastic engineering plastic toughened epoxy resin is selected in the epoxy resin cure system, and curing and toughening of epoxy resin can be realized under the premise of not reducing or slightly reducing mechanical properties and thermal properties.

The invention relates to a preparation method of a lithium battery diaphragm. The method comprises the following steps: 1, dissolving an organic polymer in an organic solvent to obtain an organic polymer solution; 2, adding an inorganic material to the organic polymer solution obtained in step 1, uniformly mixing, heating, and carrying out ball milling to obtain a mixture; and 3, casting the mixture obtained in step 2 on a substrate, and drying to obtain the final product inorganic/organic composite diaphragm. The method has the advantages of simple steps and low cost, and the prepared diaphragm has the advantages of porousness, flexibility, mechanical strength, good stability, good uniformity, and good heat resistance, has a good popularization prospect, and can be applied to the lithium ion battery field.

The invention relates to a method for preparing a polycaprolactone-keratin composite nanometer fiber pipe. The method includes the steps of firstly, dissolving polycaprolactone in a solvent, stirring the solvent to dissolve the polycaprolactone, and obtaining a polycaprolactone solution; secondly, dissolving keratin in a solvent, stirring the solvent to dissolve the keratin, and obtaining a keratin solution; thirdly, mixing the polycaprolactone solution with the keratin solution according to the mass ratio of 95:5 to 5:95, stirring the mixture to mix the mixture evenly, and obtaining a spinning solution; fourthly, conducting electrostatic spinning, and obtaining the polycaprolactone-keratin composite nanometer fiber pipe with a cylindrical collection roller serving as a receiver. The tubular material obtained through the method not only keeps good biological activity of the keratin, but also has good tenacity and mechanical strength of the polycaprolactone; meanwhile, the tubular material has the advantages of being adjustable in inner diameter, simple in preparation method and the like and is expected to be used for the field of artificial blood vessels and the like.

The invention discloses a novel high-efficiency PPR (pentatricopeptide repeat) pipe cold-resistant toughening color master batch. The color master batch comprises the following components in parts by weight: 5-25 parts of polypropylene, 5-10 parts of pigment, 35-65 parts of cold-resistant modifying agent and 1-15 parts of reinforced modifying agent, wherein the cold-resistant modifying agent is one substance or a mixture of more of styrene-butadiene-styrene ternary segmented copolymer, ethylene-vinyl acetate copolymer and ethylene-octylene copolymer, and the reinforced modifying agent is one substance or a mixture of more of nano calcium carbonate, nano silicon and the nano barium sulfate. According to the color master batch, the formula components of the color master batch can be optimized and improved, so that the novel high-efficiency PPR pipe cold-resistant toughening color master batch can be prepared. The color master batch provided by the invention not only can play a role in coloring, but also can obviously improve the flexibility and the shock strength of the PPR pipe under the condition of low temperature, so that the cold resistance of the pipe can be improved, and the service life of the pipe can be prolonged.

The invention relates to a preparation method of a tubular polyurethane/keratin composite nanofiber material. The preparation method comprises the steps of dissolving polyurethane in solvent and stirring until dissolving completely to obtain a polyurethane solution; dissolving keratin into a solvent and stirring until dissolving completely to obtain a keratin solution; mixing the polyurethane solution and the keratin solution with mass ratio of 95:5-5:95, stirring uniformly to obtain a polyurethane/keratin spinning solution, performing electrostatic spinning and using a cylindrical collecting roller as a receiver. The method can compound natural biomacromolecular keratin and polyurethane into the tubular nanofiber material through electrostatic spinning, so that the material has high porosity and good mechanical and biological functions.

The invention relates to a composite material with a high dielectric constant and a preparation method for the composite material. The composite material with the high dielectric constant is formed by hot-pressing and molding polyvinylidene fluoride powder which serves as a base material and nano Fe3O4 particles which serve as a filling material, wherein the volume of the nano Fe3O4 particles accounts for 3-22% of the composite material. The method comprises the following steps of: preparing the nano Fe3O4 particles by adopting a hydrothermal method; converting the volume percentage of 3 to 22 percent of nano Fe3O4 particles into a mass ratio; mixing and uniformly stirring the nano Fe3O4 particles and the polyvinylidene fluoride powder; and obtaining the composite material with the high dielectric constant by hot-pressing and molding at a temperature of 180 to 220 DEG C under a pressure of 6 to 15 Mpa to obtain composite material with high dielectric constant. The preparation process is simple, low in power consumption, low in cost and molded conveniently; and the obtained raw materials are not required to be subjected to further chemical treatment.

The invention relates to the technical field of urban traffic, in particular to a honeycomb tendon drawing type anti-crack road surface. The road surface consists of a surface layer and a honeycomb tendon. The material of the surface layer is compact type bituminous concrete. The honeycomb tendon is a netty structure which is formed by a plurality of regular hexagon frames with the circumcircle diameter of 40-60mm. The cross sectional area of each frame edge formed into the regular hexagon frames is 6-10 mm<2>, the material of the frame edge is low-pressure polyethylene engineering plastics. The honeycomb tendon is arranged in the surface layer, and the distance from the upper surface of the honeycomb tendon to the covered road surface is 10-15mm. The honeycomb tendon drawing type anti-crack road surface can greatly reduce the frequency for the maintainance and the constructure of the road surface and the corresponding investment, and can greatly prolong the service life of the road surface.

The invention discloses a touch LCD screen, which comprises an upper substrate, a lower substrate, and a liquid crystal layer, wherein the upper substrate comprises a touch screen; the lower substrate and the upper substrate are oppositely arranged; the lower substrate comprises a thin film transistor panel; the liquid crystal layer is arranged between the upper substrate and the lower substrate; a conducting layer of the touch screen comprises a first carbon nanotube layer; and a semiconductor layer of a thin film transistor on the thin film transistor panel comprises a second carbon nanotube layer.

The invention discloses a super-light ultrathin flexible nano metal/nanofiber composite membrane with an X-ray shielding property and a preparation method of the super-light ultrathin flexible nano metal/nanofiber composite membrane, and belongs to the technical field of X-ray shielding materials. The preparation method comprises the following steps: by using a method that an electrospinning technique and a metal chemical sedimentation technique are combined, forming nano metal particles which are of specific morphology and are continuously and tightly accumulated on surfaces of organic nanofibers, forming a nanofiber membrane with nano metal sedimentation, overlapping nanofiber membranes layer by layer through hot pressing or with a resin reinforcing agent, thereby obtaining the super-light ultrathin flexible nano metal/nanofiber composite membrane. The density of the membrane is only 5-20% of that of a pure metal, the conductivity of the membrane has anisotropism, the transverse conductivity has properties of metal conductivity, and the longitudinal conductivity accounts for 1/10 million of the transverse conductivity. Due to adsorption loss of the nano metal particles, multiple times of reflection of fiber membranes, nano structure scattering and macroscopic structure scattering, incident X-rays are hard to overflow, then effective absorption can be achieved, and X-ray equivalent wide frequency band electromagnetic protection materials of novel full-nano structures with good properties can be prepared.

The invention provides a manufacturing method of a metal housing for packaging an electronic assembly. The metal housing comprises a metal housing main body and a diamond copper heat sink plate embedded into a bottom plate of the metal housing main body, wherein the electronic assembly is arranged on the diamond copper heat sink plate; and the metal housing main body is connected with the diamondcopper heat sink plate by adopting brazing. The adopted diamond copper heat sink plate is low in thermal expansion coefficient, low in density and high in heat conductivity; efficient heat dissipationcapacity is ensured while matching with the thermal expansion coefficient of the electronic assembly is ensured; failures of the metal housing and the electronic assembly due to an over-high workingenvironment temperature are avoided; the heat dissipation requirements of high-power components on the metal housing are met; and the metal housing main body and the diamond copper heat sink plate aresubjected to nickel-plated treatment and are connected by adopting a brazing method, wherein nickel and silver-copper eutectic solder are relatively low in price, so that the manufacturing cost of the metal housing is reduced.