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Mother stock of polyvinyl carbon nanotube anti-static composite material and anti-static composite material based on mother stock
InactiveCN1670070AGood antistatic propertiesComprehensive mechanical propertiesAntistatic MaterialsMaleic anhydride
The invention relates to an anti-static modified material with carbon nanotubes (CNTs) predominantly and a process which is a thermal oxidation treatment with acid together with a ball grinding surface treatment to CNTs and comprises: adding maleic anhydride grafted polyethylene, coupling agents and EPT rubber to prepare the high concentration masterbatch of CNTs / PE anti-static composite material by solution blending and melt blending methods, mixturing the said masterbatch with common PE in a finite proportion to melt blend and prill, then getting the final CNTs / PE anti-static composite material. The electrical surface resistivity and volume resistivity can reach the operating requirements of the anti-static material when the content of CNTs is only 0.3 wt % in the CNTs / PE anti-static composite material in the invention.
Owner:EAST CHINA UNIV OF SCI & TECH
Arc-shaped guide rail lateral-deviation side-tipping high-speed tire tester
ActiveCN102323069ASimple structureEasy to manufactureVehicle tyre testingForce sensorLateral deviation
The invention relates to an arc-shaped guide rail lateral-deviation side-tipping high-speed tire tester, which comprises an arc-shaped guide rail lateral-deviation positioning mechanism, an arc-shaped guide rail side-tipping positioning mechanism, a dual-guide-rail vertical loading positioning mechanism, a six-component sensor and driving brake assembly and a test rotary drum. The tester has the advantages of simple and reasonable structure, low cost, capability of realizing various running conditions of a tire, invariable center of a tire track under complex working conditions, and capabilities of accurately controlling six-degree-freedom movement parameter of the tire and realizing accurate measurement of the six-component characteristic of the tire.
Owner:JILIN UNIV
Compound four-connecting rod testing machine for mechanical properties of tire
ActiveCN102435449ASimple structureEasy to manufactureVehicle tyre testingHydraulic cylinderMotion parameter
The invention relates to a compound four-connecting rod testing machine for the mechanical properties of a tire. The testing machine comprises an arc-shaped guide rail device, a compound four-connecting rod mechanism assembly, a vertical loading sliding plate part assembly, a six-component sensor and driving brake device assembly and a simulated road device, wherein the arc-shaped guide rail device consists of a substrate hydraulic cylinder and arc-shaped guide rails; the compound four-connecting rod mechanism assembly consists of a substrate, four connecting rods, a big swing rod mechanism and a small swing rod mechanism; the vertical loading sliding plate part assembly consists of a box body, guide rails, a sliding plate, a hydraulic cylinder, a hydraulic cylinder junction board and an upper transition board; and the six-component sensor and driving brake device assembly consists of a six-component sensor and a driving brake device. The compound four-connecting rod testing machine for the mechanical properties of the tire has a simple and reasonable structure and low price, is capable of realizing various operation conditions of the tire and is capable of accurately controlling the six degrees of freedom motion parameters of the tire and the relation between the six degrees of freedom motion parameters and the six components of the ground, and moreover, the trace center of tire is not changed under the compound operation conditions.
Owner:JILIN UNIV
Evaluation method of self-repairing effect of self-repairing cement-based material
InactiveCN105300801AControl diversificationComprehensive performance response evaluationPreparing sample for investigationMaterial strength using tensile/compressive forcesStress intensity factorPhysical property
The invention relates to the field of methods for testing or analyzing concrete by virtue of the chemical or physical properties of a measuring material, particular to an evaluation method of the self-repairing effect of a self-repairing cement-based material. The evaluation method of the self-repairing effect of the self-repairing cement-based material is characterized in that the evaluation indexes comprise relative dynamic elasticity modulus, fracture behaviors (stress intensity factor recover rate and fracture toughness recover rate), constitutive behavior comparison, flexural rigidity recover rate and strength recover rate. The evaluation method comprises the following steps: step 1, preparing a test piece; step 2, prefabricating local cracks and dispersed cracks; step 3, testing all the parameters; step 4, completing self repairing; step 5, testing all the parameters; step 6, calculating, processing, and evaluating the repairing effect. The method is comprehensive in evaluation.
Owner:TONGJI UNIV
Purple-light cross-linked low-smoke halogen-free high flame-retardant EVA cable and production method thereof
InactiveCN104200906AImprove performanceImprove shielding effectInsulated cablesCable/conductor manufactureLow smoke zero halogenGlass fiber
The invention provides a purple-light cross-linked low-smoke halogen-free high flame-retardant EVA cable which comprises conductors. Each conductor is covered with a shield layer, the shield layer is covered with a purple-light cross-linked insulating layer, the purple-light cross-linked insulating layer is covered with a ceramic silicone rubber layer, and the ceramic silicon rubber layer is covered with an anticorrosive layer. Flame-retardant glass fiber filling ropes are filled among the conductors, the conductors and the flame-retardant glass fiber filling ropes are together covered with a flame-retardant tape, the flame-retardant tape is covered with an internal purple-light cross-linked protective layer, the internal purple-light cross-linked protective layer is provided with an armor layer, the armor layer is covered with an external purple-light cross-linked protective layer, the external purple-light cross-linked protective layer is covered with a waterproof layer, the waterproof layer is covered with an SBS rubber layer, and the SBS rubber layer is coated with an ultraviolet-proof layer. The invention further provides a production method of the cable. The purple-light cross-linked low-smoke halogen-free high flame-retardant EVA cable is provided with multiple flame-retardant layers and the waterproof layer.
Owner:ZHANGQIU POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO
Irradiation cross-linking high-performance high flame-resistant electric wire and cable and preparation method thereof
InactiveCN104200905AFlame retardantImprove performanceClimate change adaptationInsulated cablesInsulation layerElectrical conductor
The invention provides an irradiation cross-linking high-performance high flame-resistant electric wire and cable which comprises conductors. A shielding layer is arranged outside each conductor, an irradiation cross-linking polyethylene insulation layer is arranged outside each shielding layer, a fire-resistant mica layer is arranged outside each irradiation cross-linking polyethylene insulation layer, the conductors are filled with rock wool ropes, a flame-resistant belt is arranged outside the conductors and the rock wool ropes, a flame-resistant polyethylene inner protection layer is arranged outside the flame-resistant belt, an armor layer is arranged outside the flame-resistant polyethylene inner protection layer, a flame-resistant polyethylene outer protection layer is arranged outside the armor layer, an abrasion-resistant layer is arranged outside the flame-resistant polyethylene outer protection layer, and an ultraviolet-proof layer coats the abrasion-resistant layer. The invention further provides a preparation method of the electric wire and cable. The irradiation cross-linking polyethylene insulation layers, the fire-resistant mica layers, the rock wool ropes, the flame-resistant polyethylene inner protection layer, the flame-resistant polyethylene outer protection layer and the abrasion-resistant layer have flame resistance, multiple layers are set, and the flame resistance of the electric wire and cable is far higher than that of similar products.
Owner:苏州天盛电线电缆有限公司
Assessment method of copper clad laminate mechanical properties
ActiveCN102539318ASimple, quick and resilientMeet the test requirementsMaterial strength using steady bending forcesUsing mechanical meansCopper foilTest requirements
The invention provides an assessment method of copper clad laminate mechanical properties, which comprises the following steps: step 1, providing a copper clad laminate to be tested; step 2, manufacturing a sample to be tested, that is, etching the copper foil of the copper clad laminate to be tested, cutting the copper clad laminate with etched copper foil into a sample to be tested with a predetermined dimension; step 3, bending to obtain a predetermined angle by allowing the sample to be tested to surround a cylinder with a predetermined diameter; step 4, observing the laminating condition of the sample to be tested after bending, wherein if no lamination occurs, the sample to be tested accords with testing requirements, if lamination occurs, the sample to be tested does not accord with the testing requirements. The assessment method of copper clad laminate mechanical properties of the invention can simply and rapidly assess whether the mechanical properties to be tested of the copper clad laminate accord with the testing requirements, can rapidly and intuitively characterize the mechanical properties to be tested of the copper clad laminate, such as bonding force and toughness, and improve the assessment method of copper clad laminate mechanical properties.
Owner:GUANGDONG SHENGYI SCI TECH
Isolating switch transmission device for track traffic
ActiveCN102568880APerfect mechanical propertiesFunction increaseSwitch power arrangementsDrive shaftEngineering
The invention discloses an isolating switch transmission device for track traffic. A direct current motor is connected with a worm speed reducer; an output shaft of the worm speed reducer is connected with a dynamic contact knife of an isolating switch through an insulating transmission shaft; a drive bevel gear on a manually operated transmission shaft which can be telescopically arranged is engaged with or disengaged from a driven bevel gear on another input shaft of the worm speed reducer; a switch-on / off locking structure comprises a switch-on / off position locking plate and a switch-on / off position locking rod which are fixed on an output shaft, etc.; an electric mode and manual operation mode selecting module is composed of a mode selecting locking rod, a clutch, a push plate, etc.; an electric mode and manual operation mode electrical interlocking mechanism is composed of a push plate, an electric position switch, a manual position switch, a mode knob, etc.; and a locking mode electric interlocking mechanism is composed of a mode knob and a locking position switch. The isolating switch transmission device for track traffic disclosed by the invention integrates locking, manual and electric operation modes into one, and each mode can be executed independently without interference to other modes, therefore, the isolating switch transmission device for track traffic is ingenious and practical in structural design, and has impeccable mechanical and electric interlocking performances.
Owner:CHENGDU ZHONGGONG ELECTRIC ENG
Helical gear time-varying mesh stiffness calculating method based on finite element analysis
ActiveCN107763173APerfect mechanical propertiesRich applicationGeometric CADPortable liftingElement modelElement analysis
The invention discloses a helical gear time-varying mesh stiffness calculating method based on finite element analysis, and belongs to the field of gear transmission system dynamics optimization design. How to calculate the helical gear time-varying mesh stiffness in a high precision and high efficiency mode in the prior art is the problem needing to be solved. According to the helical gear time-varying mesh stiffness calculating method, elastic deformation is analyzed by building a finite element model, gear single-tooth mesh stiffness is calculated through an ISO method, and accordingly, helical gear mesh stiffness is obtained; the helical angle value range and the gear width value range are not limited, the high-precision helical gear time-varying mesh stiffness can be calculated, and the reference is provided for gear dynamics theory and application perfecting, gear vibration reduced, noise reduction, gear modification and other aspects.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
High-strength high-toughness metal prefabricated material and preparation method thereof
InactiveCN105441777AHigh strengthReduce thicknessMetallic material coating processesHigh power lasersToughening
The invention discloses a high-strength high-toughness metal prefabricated material and a preparation method thereof. Metal or alloy serves as a substrate of the material. Heterogeneous isomerous reinforced phases obtained through selected area strengthening and toughening treatment are distributed on the substrate. Under the circumstance that the weight of the substrate of the material is essentially unchanged, the malleability and weldability of a metal equilibrium-state structure are achieved, and the strength and abrasion resistance of a metal metastable-state structure are also achieved. According to the preparation method, energy beams / fields which comprise high-power laser beams or electron beams, ion beams and an induction heat source are adopted, and the energy beams / fields conduct the selected area strengthening and toughening treatment on the metal or the alloy to obtain the heterogeneous isomerous reinforced phases on the substrate. On the premise that properties of components are not degraded, the thickness or the dead weight of the components is greatly reduced, and thus the high-strength high-toughness metal prefabricated material can be widely applied to industrial fields such as automobiles, aircrafts, ships and trains hopefully.
Owner:武汉飞能达激光技术有限公司
Direct current isolation switch for rail transit
ActiveCN102543550AIncrease contact areaHigh pressure at the contact pointAir-break switch detailsManual transmissionMode selection
The invention discloses a direct current isolation switch for a rail transit. The direct current isolation switch consists of a direct current isolation switch body and an operating mechanism thereof, wherein the switch body consists of a moving contact component and a fixed contact component; the moving contact component mainly comprise a moving contact cutter and two flexible connections which are formed by stacking and bending a plurality of layers of copper sheets and fixed between a conductive plate and a wire connection plate; the fixed contact component mainly comprises a plurality of unit pincerlike structures suspended on two locking rods; each unit pincerlike element consists of two left contact fingers, two right contact fingers, a cylindrical pin and a tension spring; the operating mechanism consists of a direct current motor, a worm wheel speed reducer, a switch-on and switch-off locking structure, a mode selection mechanism, a mode electric interlock mechanism and the like; and a gear on a manual transmission shaft is meshed with or separated from a gear on the other input shaft of the worm wheel speed reducer. The direct current isolation switch is integrated with three operating modes, namely a locking mode, a manual mode and an electric mode, has complete mechanical and electric interlock performance, and is suitable for occasions, on which the rated voltage is direct current (DC) 1,800V and the rated current is 4,000A.
Owner:CHENGDU ZHONGGONG ELECTRIC ENG
Anti-static layered board and preparation method thereof
InactiveCN1792632AImprove antistatic effectExcellent overall performanceOther chemical processesSynthetic resin layered productsImidazoline derivativesCarbon black
An antistatic composite plate used in electronic and computer areas is composed of a basic layer made of water-hardening cementing material, a transition layer made of polymer and concrete, and a surface layer made of high-molecular material and the antistatic agent prepared from amphophilic compound, electric conductive carbon black or graphite or metal powder, diluent or coupling agent, block copolymer and super-disperser. It has high antistatic, fire-proof, mechanical and anticorrosion performance.
Owner:SUZHOU UNIV
Irradiation-resistant halogen-free high-flame-retardant EVA electric wire and manufacturing method thereof
ActiveCN104183317AImprove performanceImprove shielding effectInsulated cablesInsulated conductorsElectrical conductorMaterials science
The invention provides an irradiation-resistant halogen-free high-flame-retardant EVA electric wire which comprises a conductor. A shielding layer is arranged outside the conductor. An irradiation-resistant flame-retardant EVA insulating layer is arranged outside the shielding layer. A fireproof layer is arranged outside the irradiation-resistant flame-retardant EVA insulating layer. A high-temperature-resistant layer is arranged outside the fireproof layer. The conductor is filled with a flame-retardant fiberglass filling rope. A flame-retardant belt is arranged outside the whole conductor and the flame-retardant fiberglass filling rope. An inner irradiation-resistant flame-retardant EVA layer is arranged outside the flame-retardant belt. An armor layer is arranged outside the inner irradiation-resistant flame-retardant EVA layer. An outer irradiation-resistant flame-retardant EVA layer is arranged outside the armor layer. A waterproof and corrosion-proof layer is arranged outside the outer irradiation-resistant flame-retardant EVA layer. A wearing layer is arranged outside the waterproof and corrosion-proof layer. The exterior of the wearing layer is coated with an irradiation-resistant layer. The invention further provides a preparation method of the electric wire. The irradiation-resistant halogen-free high-flame-retardant EVA electric wire is obtained due to the arrangement of the multiple irradiation-resistant layers and the multiple flame-retardant layers.
Owner:珠海思科信电线电缆有限公司
Sport biomechanical coupling analysis system
InactiveCN107092749ARealize kinematics testingPerfect mechanical propertiesInput/output for user-computer interactionMeasurement devicesBatch processingMeasurement device
The invention discloses a sport biomechanical coupling analysis system. The system is mainly composed of a test device, a wireless synchronous trigger device and a human-computer interaction software system, wherein the test device comprises a speed-variable dynamometric platform, insole-type sole measurement devices, optical motion capture devices, high-speed video cameras and wireless myoelectric measurement devices; the wireless synchronous trigger device controls the test device by emitting synchronous pulses to realize signal synchronous collection and storage of biokinetic and kinetic parameters; and the human-computer interaction software system comprises a biomechanical model test module, a parameter setting module, a data batch processing module, an optical capture test data preprocessing module, a data analysis module and a database storage and manual playback analysis module. The system has the advantages of comprehensive test parameters, good universality, simplicity, reliability, etc., and in-vivo, real-time and precise coupling quantitative analysis of multiple mechanical parameters, the motion mechanism and the motion law of biological motion is realized in a true sense.
Owner:JILIN UNIV
Compound four-connecting rod testing machine for mechanical properties of tire
ActiveCN102435449BSimple structureEasy to manufactureVehicle tyre testingHydraulic cylinderMotion parameter
Owner:JILIN UNIV
Metal prefabricated material and preparing method thereof
The invention discloses a metal prefabricated material and a preparing method thereof. The base body of the material is metal or alloy. A polymorphism reinforcement phase obtained through selection area strengthening and toughening treatment is distributed on the base body. The material has the characteristics of high ductility and weldability of a metal equilibrium state structure and also has the high strength and high abrasion resistance of a metal metastable state structure under the situation that the weight of the base body is kept basically not changed. According to the method, an energy beam / field including a high-power laser beam or electronic beam, an ion beam and an induction heat source is adopted, the material selection area strengthening and toughening treatment is carried out on the base body of the metal or the alloy through the energy beam / field, and the polymorphism reinforcement phase is obtained in the base body. The base body has the phase change hardening characteristic or the polymorphism reinforcement phase is obtained in the manner that solid dissolving is carried out firstly and then ageing strengthening is conducted. The prefabricated material is particularly suitable for manufacturing carrying tools.
Owner:武汉飞能达激光技术有限公司
Aluminum niobium boron intermediate alloy preparation method for crystalline grain refinement, aluminum niobium boron intermediate alloy, aluminum niobium boron cast ingot and aluminum niobium boron alloy rope
The invention discloses an aluminum niobium boron intermediate alloy preparation method for crystalline grain refinement. The aluminum niobium boron intermediate alloy preparation method comprises thefollowing steps that an industrial pure aluminum ingot, an aluminum niobium alloy and an aluminum boron alloy are prepared; the industrial pure aluminum ingot is melted, and the aluminum niobium alloy is added in with the temperature being 1150-1250 DEG C; the temperature of an obtained solution is controlled to be 920-1250 DEG C, and the aluminum boron alloy is added in; foam removing and slag cleaning are performed on the obtained solution; and then the solution is transferred to a casting furnace, and refining degassing is performed to prepare an aluminum niobium boron intermediate alloy.The aluminum niobium boron intermediate alloy preparation method is simple and feasible, the product impurity element content is extremely low, use of corrosive KBF4 salt in the casting process is avoided, meanwhile, the aluminum niobium alloy is used to replace pure niobium to improve the operability, and the cost is reduced; and the aluminum niobium boron intermediate alloy prepared by the aluminum niobium boron intermediate alloy preparation method is uniform in structure, small in fineness, extremely low in impurity content and convenient and efficient to apply when serving as a crystalline grain refinement agent, metal burning damage can be effectively avoided, so that the alloy internal cleanliness is guaranteed, and the improvement effect on casting crystalline grain is obvious.
Owner:中信金属股份有限公司
Nano-pore single-molecule fluorescence imaging device and method under alternating current mode
ActiveCN107860752AImprove stabilityExpand the range of applicationNanostructure characterisationFluorescence/phosphorescenceTotal internal reflectionHigh spatial resolution
Owner:TSINGHUA UNIV
Halogen-free flame-retardant regenerative polystyrene material for household electronic devices and preparation method of halogen-free flame-retardant regenerative polystyrene material for household electronic devices
The invention belongs to the technical field of macromolecular plastic recycling and discloses a halogen-free flame-retardant regenerative polystyrene material for household electronic devices.The halogen-free flame-retardant regenerative polystyrene material comprises, by weight, 50-80 parts of PS (polystyrene) recycled materials, 10-40 parts of compound flame retardant packet, 10-20 parts of impact modifiers, 0.2-0.5 part of ultraviolet absorbents, 0.1-0.6 part of antioxidant packet and 0.2-1 part of lubricant, wherein a compound flame retardant is prepared from ammonium polyphosphate, pentaerythritol and modified siliceous earth by compounding.The halogen-free flame-retardant regenerative polystyrene material for the for household electronic devices has the advantages that the fire retardant is well compatible with matrix resin, so that thermal stability of the material is enhanced while material strength is improved; silicon in the siliceous earth plays a synergistic role in a system, so that flame-retardant efficiency is improved greatly; regenerative PS toughness is improved by taking K resin and elastomers as the impact modifiers, and accordingly the prepared regenerative polystyrene material has comprehensive mechanical properties and is less prone to being ignited, little in smoke and fewer in molten drop.
Owner:深圳市铂盈天其科技有限公司
Vehicle-road coupling dynamic environment tester
ActiveCN109084945APerfect mechanical propertiesComprehensive evaluation of mechanical propertiesMaterial strength using tensile/compressive forcesMaterial strength using repeated/pulsating forcesRoad surfaceEngineering
The invention provides a vehicle-road coupling dynamic environment tester, and belongs to the technical field of vehicle-road coupling testing equipment. The vehicle-road coupling dynamic environmenttester comprises a vibration table, a temperature and humidity control box, a test stand, a test piece, a test wheel and a transmission mechanism; the temperature and humidity control box is arrangedon the vibration table; the test stand is arranged on the vibration table and positioned in the temperature and humidity control box; the test stand comprises a lifting table; the test piece is arranged on the lifting table; the test wheel is in contact with the test piece and is used for moving back and forth to roll the loaded test piece; and the transmission mechanism is arranged on the test stand and is connected with the test wheel. According to the vehicle-road coupling dynamic environment tester provided by the invention, the test piece can be simultaneously applied with a vertical pressure and a vibrating force, and the vibration table can simulate a movement state of a pavement under the vehicle load excitation in the practical engineering application, so that each mechanical parameter of the pavement can be subjected to a simulated test closer to practical application, and mechanical properties of the pavement can be really and comprehensively evaluated.
Owner:SHIJIAZHUANG TIEDAO UNIV
Mother stock of polyvinyl carbon nanotube anti-static composite material and anti-static composite material based on mother stock
InactiveCN1303147CImprove antistatic performanceImprove mechanical propertiesHigh concentrationMasterbatch
The invention relates to an anti-static modified material with carbon nanotubes (CNTs) predominantly and a process which is a thermal oxidation treatment with acid together with a ball grinding surface treatment to CNTs and comprises: adding maleic anhydride grafted polyethylene, coupling agents and EPT rubber to prepare the high concentration masterbatch of CNTs / PE anti-static composite material by solution blending and melt blending methods, mixturing the said masterbatch with common PE in a finite proportion to melt blend and prill, then getting the final CNTs / PE anti-static composite material. The electrical surface resistivity and volume resistivity can reach the operating requirements of the anti-static material when the content of CNTs is only 0.3 wt % in the CNTs / PE anti-static composite material in the invention.
Owner:EAST CHINA UNIV OF SCI & TECH
High-thermal-conductivity silicone rubber cable material as well as preparation method and application thereof
PendingCN114213850AGood high and low temperature resistanceGood electrical insulation propertiesRubber insulatorsSilane couplingThermal conductivity
The invention provides a high-thermal-conductivity silicone rubber cable material and a preparation method and application thereof, and the high-thermal-conductivity silicone rubber cable material comprises specific parts of silicone rubber, a flame retardant, polydopamine modified graphene, boron nitride, silicone master batch and a silane coupling agent. According to the high-thermal-conductivity silicone rubber cable material, a combination of specific parts of boron nitride and polydopamine modified graphene is selected as a thermal conductive filler, and the boron nitride and the polydopamine modified graphene are matched in a silicone rubber matrix to form a complete thermal conductive network, so that the obtained cable material has excellent thermal conductivity; meanwhile, specific parts of the flame retardant and the silane coupling agent are also added, so that the flame retardant property and the mechanical property of the cable material are effectively improved, and the high-thermal-conductivity silicone rubber cable material meeting the dual standards of IEC62930 and UL4703 is finally obtained.
Owner:JIANGSU DASHENG POLYMER
C70-TiC reinforced high-quality stainless steel and preparation method thereof
The invention discloses C70-TiC reinforced high-quality stainless steel and a preparation method thereof, and belongs to the technical field of alloy material manufacturing. The problems of poor wearresistance and insufficient corrosion resistance of existing austenitic stainless steel are solved. The stainless steel is composed of, by mass, 18%-22% of Cr, 8%-12% of Ni, 1%-1.5% of N, 3%-5% TiC, 0.3%-1.2% C70, and the balance being Fe and unavoidable impurities. After ball milling of Cr powder, Ni powder, ferrochrome nitride powder, TiC, C70 and iron powder, cold pressing for blocks, hot pressing sintering, repeated heating and temperature reduction, and deformation treatment are carried out to obtain the stainless steel. The stainless steel of an ultra-fine structure has high hardness, high ductility and toughness, high wear resistance and excellent corrosion resistance, and can be used in special environments such as a plastic injection molding industry and a food industry.
Owner:ZHONGBEI UNIV
Bio-based air purification nanofiber membrane for mask and preparation method
ActiveCN112962219AImprove air purification effectImprove the protective effectConjugated cellulose/protein artificial filamentsFilament/thread formingMeth-Spinning
The invention belongs to the technical field of medical sanitary materials, and particularly relates to a bio-based air purification nanofiber membrane for a mask and a preparation method. The preparation method comprises the steps of preparing a core layer solution or a shell layer solution from rice hull powder, graphene-nano cerium dioxide composite powder, polyvinyl alcohol and a polygonum cuspidatum root extract as raw materials, and then preparing the nanofiber membrane through coaxial electrostatic spinning, wherein when the shell layer solution is prepared, the polyvinyl alcohol is dissolved in water to prepare an aqueous solution, then the esterified rice hull powder, the graphene-nano cerium dioxide composite powder and the polygonum cuspidatum root extract are dispersed in methanol to prepare a methanol solution, and finally the aqueous solution and the methanol solution are stirred and mixed uniformly; and when the core layer solution is prepared, hexadecyl trimethyl ammonium bromide is dissolved in the methanol firstly, then the rice hull powder is added, and ultrasonic dispersion is conducted to be uniform. The obtained nanofiber membrane has a relatively good air purification effect and can be used for mask manufacturing, and the manufactured mask is good in protection effect, good in use comfort and good in mechanical property.
Owner:新石器科技有限公司
Self-healing effect evaluation method of self-healing cement-based materials
InactiveCN105300801BControl diversificationComprehensive performance response evaluationPreparing sample for investigationMaterial strength using tensile/compressive forcesSelf-healingStress intensity factor
The invention relates to the field of methods for testing or analyzing concrete by means of measuring chemical or physical properties of materials, in particular to a method for evaluating self-repairing effects of self-repairing cement-based materials. A self-healing effect evaluation method for self-healing cement-based materials, characterized in that: evaluation indicators include relative dynamic elastic modulus, fracture behavior (stress intensity factor recovery rate, fracture toughness recovery rate), constitutive behavior comparison, bending resistance Stiffness recovery rate and strength recovery rate. Follow the steps below: Step 1: Prepare specimen; Step 2: Prefabricate local cracks and scattered cracks; Step 3: Test various parameters; Step 4: Complete self-repair; Step 5: Test various parameters; Step 6: Calculate Treatment and evaluation of restoration effects. The present invention is comprehensively evaluated.
Owner:TONGJI UNIV
A calculation method for time-varying meshing stiffness of helical gears based on finite element analysis
The invention discloses a method for calculating the time-varying meshing stiffness of helical gears based on finite element analysis, which is applied to the field of dynamic optimization design of gear transmission systems. Aiming at the current problem of how to obtain the time-varying meshing stiffness of helical gears with high precision and high efficiency, The invention analyzes the elastic deformation by establishing a finite element model, and calculates the meshing stiffness of a single tooth of the gear by combining the ISO method, and then obtains the meshing stiffness of the helical gear. The meshing stiffness provides a reference for improving the theory and application of gear dynamics, gear vibration reduction, noise reduction and gear modification.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Halogen-free flame-retardant polystyrene regenerated material for household electronic devices and preparation method thereof
The invention belongs to the technical field of macromolecular plastic recycling and discloses a halogen-free flame-retardant regenerative polystyrene material for household electronic devices.The halogen-free flame-retardant regenerative polystyrene material comprises, by weight, 50-80 parts of PS (polystyrene) recycled materials, 10-40 parts of compound flame retardant packet, 10-20 parts of impact modifiers, 0.2-0.5 part of ultraviolet absorbents, 0.1-0.6 part of antioxidant packet and 0.2-1 part of lubricant, wherein a compound flame retardant is prepared from ammonium polyphosphate, pentaerythritol and modified siliceous earth by compounding.The halogen-free flame-retardant regenerative polystyrene material for the for household electronic devices has the advantages that the fire retardant is well compatible with matrix resin, so that thermal stability of the material is enhanced while material strength is improved; silicon in the siliceous earth plays a synergistic role in a system, so that flame-retardant efficiency is improved greatly; regenerative PS toughness is improved by taking K resin and elastomers as the impact modifiers, and accordingly the prepared regenerative polystyrene material has comprehensive mechanical properties and is less prone to being ignited, little in smoke and fewer in molten drop.
Owner:深圳市铂盈天其科技有限公司
A kind of duplex stainless steel material and its preparation method and its application in submersible oil pump vanes and guide wheels
ActiveCN104532141BImprove corrosion resistanceImprove wear resistancePump componentsPumpsImpellerMedium frequency
The invention relates to a biphase stainless steel material and a preparation method thereof, and application of the biphase stainless steel material in submersible electric pump impellers and guide wheels. The biphase stainless steel material comprises the following components in percentage by weight: at most 0.04% of C, at most 1.0% of Mn, at most 1.0% of Si, at most 0.04% of P, at most 0.04% of S, at most 24.5%-26.5% of Cr, at most 4.7%-6.0% of Ni, at most 1.7%-2.3% of Mo, at most 2.7%-3.3% of Cu, at most 0.10%-0.25% of N and the balance of Fe. The preparation method comprises the following steps: proportionally putting all the components for forming the biphase stainless steel material into a low-capacity (at most 250kg) alkaline medium-frequency electric furnace, and carrying out high-power quick smelting in the hot furnace at 1680-1700 DEG C for 40-45 minutes, wherein the molten steel is covered with perlite in the whole process and is deoxidized with a pure aluminum wire before and after discharging, and the pure aluminum wire accounts for 0.6% and is added at twice. The biphase stainless steel material can be widely used in submersible electric pump impellers and guide wheels, including K002 guide wheel, K018 impeller, N041 guide wheel and the like.
Owner:ZHEJIANG ZHENXING PETROCHEM MACHINERY
Method for evaluating tearing toughness of ductile metal materials
InactiveCN102374951BExtended stabilityPerfect mechanical propertiesMaterial strength using tensile/compressive forcesCrazingMetallic materials
The invention relates to the field of mechanical property evaluation and characterization of materials, and in particular relates to a method for evaluating the tearing toughness of ductile metal materials. The method is characterized in that through carrying out a tearing test on ductile metal materials by using three-leg trouser-shaped samples, a characteristic that applied loadings in the process of tearing are unchanged is obtained, thereby providing a powerful test basis for the proposition of a tearing toughness concept, thereby obtaining a defined tearing toughness which is shown in a formula as follows: Gamma = FS / 2 t, and used for evaluating the toughness or crack propagation resistance of ductile materials. The tearing test method and the tearing toughness concept provide an effective thought for knowing an inversion relation between the strength and plasticity (toughness) of a material, therefore, a new reference criterion is provided for selecting materials (the strength and plasticity are fitted better) for actual engineering. As for ductile sheet metals, a crack propagation process and a fracture process can be described more accurately by using the tearing toughness, which has a vital significance to the evaluation and characterization of engineering applications and mechanical properties of materials.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Assessment method of copper clad laminate mechanical properties
ActiveCN102539318BSimple, quick and resilientMeet the test requirementsMaterial strength using steady bending forcesUsing mechanical meansCopper foilEarth surface
The invention provides an assessment method of copper clad laminate mechanical properties, which comprises the following steps: step 1, providing a copper clad laminate to be tested; step 2, manufacturing a sample to be tested, that is, etching the copper foil of the copper clad laminate to be tested, cutting the copper clad laminate with etched copper foil into a sample to be tested with a predetermined dimension; step 3, bending to obtain a predetermined angle by allowing the sample to be tested to surround a cylinder with a predetermined diameter; step 4, observing the laminating condition of the sample to be tested after bending, wherein if no lamination occurs, the sample to be tested accords with testing requirements, if lamination occurs, the sample to be tested does not accord with the testing requirements. The assessment method of copper clad laminate mechanical properties of the invention can simply and rapidly assess whether the mechanical properties to be tested of the copper clad laminate accord with the testing requirements, can rapidly and intuitively characterize the mechanical properties to be tested of the copper clad laminate, such as bonding force and toughness, and improve the assessment method of copper clad laminate mechanical properties.
Owner:GUANGDONG SHENGYI SCI TECH
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