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Advanced oxidative coupling device and process for treating organic wastewater difficult to degrade
ActiveCN104787941AImprove removal efficiencyLow running costWater contaminantsWater/sewage treatment by electrochemical methodsElectrolysisMulti dimensional
The invention discloses an advanced oxidative coupling device and process for treating organic wastewater difficult to degrade. A main device body comprises an ozone oxidation-multi-dimensional electro-catalysis / microelectrolysis area, an ozone oxidation-microelectrolysis / Fenton area, a coagulation area and an inclined plate sedimentation area, wherein the ozone oxidation-multi-dimensional electro-catalysis / microelectrolysis area comprises a multi-dimensional electrolysis / microelectrolysis area at the upper part and an ozone oxidation area at the lower part; the ozone oxidation-microelectrolysis / Fenton area comprises a microelectrolysis / Fenton area at the upper part and an ozone oxidation area at the lower part. The device combines four levels of advanced oxidation systems, and electrocatalytic oxidation, ozone oxidation, Fenton oxidation and a microelectrolysis reaction are mutually coupled in function, so that an organic matter difficult to degrade is subjected to multi-level oxidation to realize complete oxidative cracking; when the device is used for treating the organic wastewater difficult to degrade, the yield and the production rate of *OH are increased, the liquid phase transfer process is accelerated, the overall current efficiency of the device is increased, operation expenses are saved, flexible regulation and control of a process unit are realized, and the device can be used for treating various kinds of organic wastewater difficult to degrade.
Owner:AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD +1
Portable terahertz spectrum detection device and detection method
ActiveCN105738314AAdjustable angleRealize measurementMaterial analysis by optical meansLight beamTime domain waveforms
The invention relates to a portable terahertz spectrum detection device and a detection method, and aims at providing a portable terahertz spectrum detection device and a method which can conduct measuring on terahertz spectra of samples with different thicknesses and different absorption characteristics. According to the technical scheme, the portable portable terahertz spectrum detection device comprises a case body, a light splitting module, a phase angle compensation module, a detection light path module, a terahertz generating module, a terahertz detecting module and a terahertz light path module. The terahertz spectrum detection method comprises the following steps that 1, a time domain waveform Er(t) is collected; 2, the center of a sample is located on the waist of a terahertz beam; 3, a time domain waveform Es(t) of the sample is measured; 4, Fourier transforming is conducted respectively to obtain frequency domain distribution of two signals; 5, a data processing model based on a Fresnel formula is adopted; 6, operation from the third step to the fifth step is repeated, and terahertz spectrum signals of the samples in different polarization directions are obtained.
Owner:ZHEJIANG UNIV
Method for manufacturing micro channel by combining laser polarization selective ablation with acid etching
InactiveCN104625438AImprove etching efficiencySignificant orientation dependenceLaser beam welding apparatusAcid etchingSelective ablation
The invention relates to a method for efficiently manufacturing a micro channel by combining femtosecond laser polarization selective ablation with chemical acid etching, and belongs to the technical field of femtosecond laser application. For the characteristics of crystalline state materials, the partial instant electronic dynamic state in the mutual action process of laser and the materials is adjusted by adjusting the laser polarization parameter and the included angle of the material crystal axis, materials in the laser machining area are triggered to be modified, and the machining efficiency and accuracy of the micro channel are improved with the assistance of chemical acid etching. The method is simple and efficient and has important study significance in the field of micro fluid machining.
Owner:EPHOTON
Medical auxiliary turning-over and back patting equipment
ActiveCN111904836AReduce labor intensityAvoid complicationsVibration massageNursing bedsBiomedical engineeringExcretion
The invention discloses medical auxiliary turning-over and back patting equipment. The equipment comprises a hollow bed board and a flat trolley. The medical auxiliary turning-over and back patting equipment can effectively assist medical staff in turning over a patient, complications caused by the fact that the patient does not turn over after lying in bed for a long time are effectively avoided,meanwhile, patting of the back of the patient by the medical staff can be simulated so as to promote sputum excretion of the patient, and direct contact between the medical staff and the patient canbe reduced; labor intensity of medical staff can be reduced; a rectangular stink cover plate is arranged, so that stink emission can be effectively avoided; the back patting device can simulate patting of the back of the patient by the medical staff; excrement of the patient can be collected through an excrement collecting tank; sputum spitted by the patient can be collected through a sputum collecting tank; the inner side face of the excrement collecting tank can be cleaned through a first liquid pump; waste is conveniently cleaned through the arrangement of the flat plate trolley; and the patient can conveniently get in and out of the bed through the arrangement of foldable handrails.
Owner:THE FIRST AFFILIATED HOSPITAL OF HENAN UNIV OF SCI & TECH
Polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and preparation method thereof
ActiveCN111346522AImprove controllabilityImprove uniformitySemi-permeable membranesMembranesPolyvinyl alcoholPorous membrane
The invention provides a polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and a preparation method thereof. The preparation method comprises the following steps: firstly, a polyvinyl alcohol-ethylene copolymer is dissolved in a mixed solvent of isopropanol and water in a mass ratio of (1: 2)-(2: 1) to prepare a polyvinyl alcohol-ethylene copolymer solution with the mass fraction of 7%-12%; then, after a polyvinyl alcohol-ethylene copolymer film is prepared through spin coating, heat treatment is conducted at the temperature 1 to 10 DEG C lower than the boiling point of an azeotrope of isopropanol and water, a solvent phase is removed, and a honeycomb-shaped porous film is formed; and finally, annealing treatment is carried out to obtain the polyvinyl alcohol-ethylene copolymer honeycomb porous membrane. The molecular chain of the selected polyvinyl alcohol-ethylene copolymer comprises a hydrophilic polyvinyl alcohol chain segment and a hydrophobic polyethylene chain segment, and the honeycomb porous membrane with uniform distribution, small pore diameter and uniform pore diameter is prepared through multi-stage solvent volatilization by utilizing the difference of solubility and boiling points of isopropanol and water on the polyvinyl alcohol-ethylene copolymer.
Owner:武汉维晨科技有限公司
Surface-enhanced Raman substrate with three-dimensional multilayered structure and preparation method thereof
ActiveCN109612976AWell structuredStrong controllabilityRaman scatteringMolecular recognitionDielectric layer
The invention belongs to the technical field of molecular recognition, and particularly relates to a surface-enhanced Raman substrate with a three-dimensional multilayered structure and a preparationmethod thereof. The surface-enhanced Raman substrate with the three-dimensional multilayered structure comprises a substrate, a ZnO seed layer growing on the surface of the substrate, a ZnO nanorod array growing on the ZnO seed layer, an Ag nano-particle layer coating on the ZnO nanorod array, an Al2O3 dielectric layer growing on the structural surface of the ZnO nanorod array coated with the Ag nano-particle layer and an Ag nano-particle layer deposited on the Al2O3 dielectric layer. According to the surface-enhanced Raman substrate with the three-dimensional multilayered structure and the preparation method thereof, a method combining a chemical method and a magnetron sputtering and atomic layer deposition technology is adopted to prepare a novel composite structural SERS substrate, thestructure of the novel composite structural SERS substrate comprises a three-dimensional structure, a core-shell structure, a sandwich structure and the like, and the flexible and varied SERS substrate with abundant structures is of great significance for studying multiple SERS mechanisms and expanding the application field of SERS.
Owner:BEIHUA UNIV
Stack type ball dropping device and ball serving mechanism capable of carrying multiple badmintons
Owner:四川新尚人工智能科技有限公司
Hand-held sampling clamping device capable of prompting pressure range
PendingCN111297405ARegulatory strengthQuality assuranceSurgical needlesVaccination/ovulation diagnosticsPhysical medicine and rehabilitationMedicine
The invention discloses a hand-held sampling clamping device capable of prompting a pressure range. The device comprises a collecting part and a handle which are connected in sequence, wherein the collecting part is used for collecting a sample; a pressure sensing mechanism and an indicating mechanism are arranged in the handle; the pressure sensing mechanism is connected with the collecting partand used for sensing pressure information when the collecting part collects the sample, and transmitting the pressure information to the indicating mechanism; and the indicating mechanism is used forindicating the pressure range. According to the technical scheme, the pressure sensing mechanism is arranged to sense the pressure range of the collected sample, and the indicating mechanism prompts the pressure range, so that an operator can quickly judge whether pressure of the collected sample is appropriate, strength of the operator during sample collection is standardized, discomfort of patients during examination is reduced, and quality of the sample and comfort and safety of the patients are ensured.
Owner:THE FIRST AFFILIATED HOSPITAL OF GUANGZHOU MEDICAL UNIV (GUANGZHOU RESPIRATORY CENT) +2
Preparation method of starch water-retaining agent with high gel strength
The invention discloses a preparation method of a starch water-retaining agent with high gel strength. The preparation method is characterized by comprising the following steps of pasting wheat starch, preparing a sodium acrylate solution under an ice bath condition, simultaneously adding cis-butenedioic acid, N, N'-methylenebisacrylamide, ammonium persulfate and the sodium acrylate solution into the pasted wheat starch to obtain a mixed solution, stirring the mixed solution, and carrying out graft copolymerization on the mixed solution to form a copolymerized product, wherein cis-butenedioic acid can also be replaced with kaolin or diatomite; and pouring the copolymerized product into a tetrafluoroethylene plate to carry out drying treatment to obtain the starch water-retaining agent with high gel strength. According to the preparation method, the starch water-retaining agent is prepared from cis-butenedioic acid or kaolin or diatomite serving as a raw material, so that the prepared starch water-retaining agent is high in gel strength, strong in biodegradability, high in water absorption rate and strong in salt tolerance, and the preparation method is simple and free of pollution and can be used for industrial production.
Owner:HEFEI UNIV OF TECH
Split Hopkinson pressure bar electromagnetic buffering and energy absorbing device
The invention provides a split Hopkinson pressure bar electromagnetic buffering and energy absorbing device comprising a first-layer impact bearing energy absorbing system, a second-layer impact bearing energy absorbing system and a third-layer impact bearing energy absorbing system, wherein the first-layer impact bearing energy absorbing system is composed of a first metal base, two ropes, two fixed pulleys, a first iron block, a metal connecting rod and an annular electromagnet; the second-layer impact bearing energy absorbing system is composed of an annular brake, a second spring and two groups of levers. The third-layer impact bearing energy absorbing system is composed of a second metal base, an annular electromagnet, a first spring and a second iron block. According to the split Hopkinson pressure bar electromagnetic buffering and energy absorbing device, the mechanical energy generated when an iron block connecting piece is impacted is utilized, through the force and energy conduction effects of the fixed pulleys, based on the lever principle, the pressure exerted by the annular brake on the connecting rod is enhanced, so that the friction force exerted by the annular brake on the connecting rod is increased, and therefore the buffering purpose is achieved.
Owner:HARBIN ENG UNIV
Slag-based alkali-activated cementing material as well as preparation method and application thereof
ActiveCN112408819ARegulatory strengthRegulation of Freezing Hardening BehaviorCement productionCalcium silicateSlag
The invention relates to a slag-based alkali-activated cementing material and a preparation method and application thereof, and the slag-based alkali-activated cementing material comprises the following components: 70-99 parts by mass of slag; 1-30 parts by mass of calcium silicate slag; an alkali activator accounting for 1%-5% of the total mass of the slag and the calcium silicate slag in the content of Na2O in the alkali activator. Compared with an existing alkali-activated slag cementing material and a preparation technology thereof, the slag-based alkali-activated cementing material provided by the invention has the advantages that the strength performance is excellent, the setting time is easy to adjust, the alkali doping amount is low, the modulus of an excitant does not need to be adjusted in advance, and the like, so that the cost is relatively low, the preparation process is simple, and the market application prospect is wide.
Owner:CHINA BUILDING MATERIALS ACAD
Biomedical calcium sulfate/collagen composite particle and preparation method thereof
ActiveCN106139248AReduced strengthRegulatory strengthTissue regenerationProsthesisFilling materialsSulfate
The biomedical calcium sulfate / collagen composite particle disclosed by the invention is composed of calcium sulfate and collagen. The particle contains 98-99.99% and 0.01-2% of collagen by weight. The preparation method includes the following steps: mixing calcium sulfate hemihydrate powder and medical collagen solution and casting to solidify into granules, wherein each granule is composed of calcium sulfate and collagen with controllable content. The ingredients in the calcium sulfate / collagen composite particle prepared by the method are controllable, and the calcium sulfate / collagen composite particle has good strength, biodegradable property and bone regeneration inducing ability and can be widely used in the field of biomedical materials such as bone filling materials.
Owner:ZHEJIANG UNIV
Non-paraxial self-accelerated frequency-doubled light beam control device and method
PendingCN109239948AIncrease flexibilityRegulatory statusNon-linear opticsLight beamFundamental frequency
The invention discloses a non-paraxial self-accelerated frequency-doubled light beam control device and method, which is applied to the technical field of optics. The device comprises an electric field unit, a quasi-phase matching unit and a filtering unit, wherein the electric field unit is electrically connected with the quasi-phase matching unit and used for loading an electric field to the quasi-phase matching unit for generating a linear electro-optical effect in the quasi-phase matching unit; the quasi-phase matching unit is further arranged at the front end of the filtering unit and used for converting a fundamental frequency light beam from a light source into a non-paraxial self-accelerated frequency-doubled light beam according to a quasi-phase matching condition, adjusting the quasi-phase matching condition by utilizing the linear electro-optical effect to control a polarization state and the intensity of the non-paraxial self-accelerated frequency-doubled light beam, and transmitting the controlled non-paraxial self-accelerated frequency-doubled light beam to the filtering unit; and the filtering unit is used for filtering the fundamental frequency light beam passing through the quasi-phase matching unit from the received light beam to obtain the controlled non-paraxial self-accelerated frequency-doubled light beam. The device can improve the flexibility of light beam control.
Owner:SHENZHEN UNIV
Angular spectrum adjustable random laser for high-contrast imaging
PendingCN114744474AGuaranteed low threshold operationStrong local electromagnetic enhancement effectMaterial nanotechnologyOptical resonator shape and constructionRandom laserGain
The invention provides a random laser with an adjustable angular spectrum for high-contrast imaging. The laser has the advantages of low threshold value, irrelevance between the threshold value and the pumping direction, long storage period, adjustable angular spectrum and the like. The random laser comprises a pump light source, a gain microcavity with random scattering and an optical fiber waveguide. Two or more gain microcavities with random scattering are coupled to different positions on the side face of the optical fiber, the different gain microcavities with random scattering are selectively pumped through the pump light source, the intensity of low-frequency angular spectrum components in a plane is effectively regulated and controlled, and random laser with different angular spectrum distributions is obtained at the fiber end of the optical fiber. When random laser of an annular angular spectrum is used as a light source of a microscope, the imaging contrast ratio of a biological sample is improved, and meanwhile speckle noise is effectively restrained.
Owner:BEIJING NORMAL UNIVERSITY
Anti-vibration device and tower device of wind turbine generator system
ActiveCN109026527ARegulatory strengthIncrease or decrease quantityWind motor controlWind motor supports/mountsWind forcePendulum
The invention provides an anti-vibration device and a tower device of a wind turbine generator system. The anti-vibration device comprises a frame body and a pendulum mass mechanism. The frame body isfixedly arranged on a structure to be suppressed to vibrate. The pendulum mass mechanism is hung on the frame body, and the pendulum mass comprises multistage swing arms and a mass block. The ends ofthe multistage swing arms are connected with each other in a pendular mode. The mass block is arranged on the last stage swing arm. According to the anti-vibration device and the tower device of thewind turbine generator system, when the wind turbine generator system vibrating with own low frequency, length of the swing arms are reduced and the problem that long swing arms causing installation space in the tower in the vertical direction limited is overcome. Meanwhile, adjustment of vibration frequency of the pendulum mass mechanism is convenient.
Owner:BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP
Self-cured metal anti-corrosion hybrid silica sol, and preparation method and application thereof
InactiveCN109957111AIncreasing the thicknessHigh densityFireproof paintsAnti-corrosive paintsMetalAlkyl
The invention provides a self-cured metal anti-corrosion hybrid silica sol, and a preparation method and application thereof. The hybrid silica sol contains a compound represented as in a formula I, wherein x, y, n and m are all integers, and R<1>, R<2>, R<4> and R<5> are alkyl groups and can be same or different.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
Double-aging heat treatment process for S520B material for low-temperature compressor
ActiveCN105219939AImprove stabilityImprove the comprehensive mechanical performance valueAir coolingHeat treating
The invention discloses a double-aging heat treatment process for an S520B material for a low-temperature compressor and belongs to the technical field of heat treatment processes. The process comprises the following steps: (1) solid solution treatment: preserving heat at 1050 DEG C for 2.0-3.0 hours and then carrying out oil cooling; (2) primary aging treatment: preserving heat at a temperature within the range of 590-610 DEG C for 4-5 hours and then carrying out air cooling; (3) additionally performing secondary aging treatment on the S520B material after being treated by aging in the step (2), namely preserving heat at a temperature within the range of 590-610 DEG C for 4-5 hours and then carrying out air cooling. The first pass filed of the low-temperature mechanical properties of low-temperature compressor parts treated through the double-aging heat treatment process is greatly increased.
Owner:SHENYANG TURBO MASCH CORP
Ball feeder for tennis training
The invention discloses a ball feeder for tennis training. The ball feeder comprises a support frame, a ball storage box, a ball conveying pipeline, a power mechanism and a ball hitting structure. A mounting base is arranged in the middle of the support frame and is connected with the power mechanism. The ball hitting structure is connected with the lower portion of the ball conveying pipeline and the power mechanism. A support block on the upper portion of the support frame is connected with the lower portion of the ball conveying pipeline. The hopper-shaped ball storage box is connected with the upper portion of the ball conveying pipeline. Tennis balls are placed in the ball storage box. A temporary storage box used for storing to-be-hit tennis balls temporally is arranged on the lower portion of the ball conveying pipeline. The upper portion of the temporary storage box is connected with the lower end of the ball conveying pipeline through a tapered cavity. A bottom opening is formed in the lower end of the temporary storage box and is matched with the ball hitting structure. The ball feeder has the advantages of simple structure, reliability in use, convenience in disassembling, assembling and carrying, wide speed regulation range, high regulation accuracy and applicability to training requirements of diffident levels of users.
Owner:UNIV OF JINAN
Reflective screen capable of improving strawberry illumination intensity
InactiveCN105475041ARealize automatic collapsingRegulatory strengthClimate change adaptationGreenhouse cultivationGreenhouseUltimate tensile strength
The invention provides a reflective screen capable of improving the strawberry illumination intensity. The reflective screen comprises a support arranged in a greenhouse, a frame-shaped support perpendicularly connected with the support, a motor arranged at the upper end of the support, a speed reducer connected with the motor and a rotation shaft connected with the output end of the speed reducer; the two ends of the rotation shaft are rotatably arranged on the two side faces of the support respectively; the side surface of the rotation shaft is connected with a sunshade net which is arranged at the upper end of the frame-shaped support. The reflective screen further comprises a reflective screen body and a fixing rod and an adjusting rod which are installed on the side wall of the greenhouse, and the two ends of the reflective screen body are arranged on the fixing rod and the adjusting rod respectively. According to the reflective screen capable of improving the strawberry illumination intensity, through the arrangement of the motor, the speed reducer, the sunshade net and the rotation shaft, automatic folding and unfolding of the sunshade net are achieved, and not only is the illumination intensity adjusted and controlled, but also the problem that the efficiency is low due to the fact that manual net drawing is adopted is solved; through the arrangement of the reflective screen body, light on the wall can be reflected to the ground to be used for strawberry growth, and the strawberry yield is greatly increased.
Owner:成都贝瑞生态农业开发有限公司
An advanced oxidation coupling device and process for the treatment of refractory organic wastewater
ActiveCN104787941BImprove removal efficiencyLow running costWater contaminantsWater/sewage treatment by electrochemical methodsElectrolysisMulti dimensional
The invention discloses an advanced oxidative coupling device and process for treating organic wastewater difficult to degrade. A main device body comprises an ozone oxidation-multi-dimensional electro-catalysis / microelectrolysis area, an ozone oxidation-microelectrolysis / Fenton area, a coagulation area and an inclined plate sedimentation area, wherein the ozone oxidation-multi-dimensional electro-catalysis / microelectrolysis area comprises a multi-dimensional electrolysis / microelectrolysis area at the upper part and an ozone oxidation area at the lower part; the ozone oxidation-microelectrolysis / Fenton area comprises a microelectrolysis / Fenton area at the upper part and an ozone oxidation area at the lower part. The device combines four levels of advanced oxidation systems, and electrocatalytic oxidation, ozone oxidation, Fenton oxidation and a microelectrolysis reaction are mutually coupled in function, so that an organic matter difficult to degrade is subjected to multi-level oxidation to realize complete oxidative cracking; when the device is used for treating the organic wastewater difficult to degrade, the yield and the production rate of *OH are increased, the liquid phase transfer process is accelerated, the overall current efficiency of the device is increased, operation expenses are saved, flexible regulation and control of a process unit are realized, and the device can be used for treating various kinds of organic wastewater difficult to degrade.
Owner:AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD +1
Flower-like beta-NaYF4:Yb<3+>/Er<3+> hexagonal prism micron crystal luminescent material with adjustable red light and green light intensity
The invention discloses a flower-like beta-NaYF4:Yb<3+> / Er<3+> hexagonal prism micron crystal luminescent material with adjustable red light and green light intensity, wherein the luminescent material is prepared in one step by using sodium fluoride as a fluorine source through a simple and rapid method, the morphology structure of the flower-like hexagonal prism micron crystal is similar to that of just blooming lily, the crystallinity is good, the dispersity is good, the size is uniform and controllable, and by changing the excitation power, the red light intensity and the green light intensity of the single flower-like beta-NaYF4:Yb<3+> / Er<3+> hexagonal prism micron crystal can be flexibly regulated and controlled. The flower-like beta-NaYF4:Yb<3+> / Er<3+> hexagonal prism micron crystal luminescent material is easily soluble in water, does not need to be modified, and has important application prospects in the fields of anti-counterfeiting, biological imaging, sensing and the like.
Owner:XIAN UNIV OF POSTS & TELECOMM
Hand instruction sensing device of surgical robot
InactiveCN114176782AEasy to operateRegulatory strengthSurgical manipulatorsSurgical robotsSurgical ManipulationHand parts
The invention discloses a surgical robot hand instruction sensing device, and relates to the technical field of surgical robot instruction sensing. The mechanical arm comprises a sensing mechanism, the sensing mechanism comprises a sensing rotating shaft, an instruction sensing grip is installed at one end of the sensing rotating shaft, a synchronous operation assembly capable of controlling the two mechanical arms at the same time is installed in the instruction sensing grip, and a pressure adjusting assembly used for adjusting finger pressing stress is further installed in the instruction sensing grip. Through the structural design, the device can simultaneously control opening and closing of two surgical instruments by a single hand when operating a robot, control of the surgical instruments does not need to be continuously switched, surgical operation is more convenient and faster, and by pushing a pressure adjusting plate to move in an instruction sensing grip and extruding a reset spring to contract, the surgical instrument can be controlled to be opened and closed by a single hand. Further, the force required for pushing the first holding block and the second holding block can be adjusted, and adjustment can be performed according to the habits of each doctor.
Owner:HENAN CANCER HOSPITAL
Solid waste-based binding agent for sintered water-permeable brick and preparation method of solid waste-based binding agent
PendingCN113816723AEffective control of porosityReduce porosityCeramic materials productionClaywaresBreaking strengthBrick
The invention provides a solid waste-based binding agent for a sintered water-permeable brick and a preparation method of the solid waste-based binding agent. The solid waste-based binding agent is prepared from the following components in percentage by weight: 7 to 20 percent of CaO, 10 to 18 percent of Al2O3, 50 to 62 percent of SiO2, 2 to 6 percent of MgO, 1 to 5.5 percent of K2O, 1 to 4 percent of Na2O, 0.5 to 4.0 percent of Fe2O3, 0 to 4 percent of B2O3 and 0 to 0.5 percent of ReO. The obtained solid waste-based binding agent is further prepared into a water-permeable brick, the obtained water-permeable brick is good in performance, the water permeation coefficient is larger than or equal to 0.01 cm / s, the compressive strength is larger than or equal to 30 MPa, the breaking strength is larger than or equal to 4 MPa, the mass loss rate after 25 times of freezing and thawing cycles is smaller than or equal to 5%, and the compressive strength loss rate is smaller than or equal to 20%. The porosity, the aperture and the strength of the sintered water-permeable brick are effectively regulated and controlled, the production cost is reduced, effective utilization of wastes is realized, the production cost is greatly saved, and the economic and environmental benefits are improved.
Owner:INNER MONGOLIA UNIV OF SCI & TECH
Polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and preparation method thereof
ActiveCN111346522BImprove controllabilityImprove uniformityMembranesSemi-permeable membranesPolymer sciencePolyvinyl alcohol
The invention provides a polyvinyl alcohol-ethylene copolymer honeycomb porous membrane and a preparation method thereof. First, dissolve the polyvinyl alcohol-ethylene copolymer in a mixed solvent of isopropanol and water with a mass ratio of 1:2 to 2:1, and prepare a polyvinyl alcohol-ethylene copolymer solution with a mass fraction of 7% to 12%. ; Then, after the polyvinyl alcohol-ethylene copolymer film is prepared by spin coating, heat treatment is carried out at a temperature 1-10°C lower than the boiling point of the azeotrope of isopropanol and water, and the solvent phase is removed to form a honeycomb porous film Carry out annealing treatment at last, obtain polyvinyl alcohol-ethylene copolymer honeycomb porous film. The polyvinyl alcohol-ethylene copolymer molecular chain that the present invention chooses comprises hydrophilic polyvinyl alcohol segment and hydrophobic polyethylene segment, utilizes isopropanol and water to polyvinyl alcohol-ethylene copolymer solubility and boiling point Difference, through multi-stage solvent volatilization, a honeycomb porous membrane with uniform distribution, small pore size and uniform pore size is prepared.
Owner:武汉维晨科技有限公司
A kind of preparation method of phenolic resin/modified or unmodified polyvinyl alcohol composite fiber adhesive
ActiveCN113564749BHigh carbon residue rateImprove adhesionCell electrodesAldehyde/ketone condensation polymer adhesivesCarbon compositesFiber
The invention relates to a method for preparing a phenolic resin / modified or unmodified polyvinyl alcohol composite fiber adhesive. The phenolic resin and modified or unmodified polyvinyl alcohol are added to a solvent to configure a viscosity of 100Pa·s~ 2000Pa·s spinning stock solution, using dry spinning process to prepare composite fiber adhesive; modified polyvinyl alcohol is more than one of polyvinyl formal and polyvinyl butyral; composite fiber adhesive In the agent, the phenolic resin is uniformly dispersed in the form of islands in the modified or unmodified polyvinyl alcohol, and the size of the dispersed phase is <2 μm; a kind of phenolic resin / modified or unmodified polyvinyl alcohol composite of the present invention The preparation method of the fiber binder has a simple process and can be applied to prefabricated bodies for carbon / carbon composite materials and carbon paper for fuel cells. The composition, fineness, chopped length and dosage are used to control the conductivity and strength of the prefabricated body and carbon paper.
Owner:DONGHUA UNIV
Bag cage for pleated filter bag and processing technology of bag cage
PendingCN114871707AIncrease productivityEasy to weld and fixHuman health protectionDispersed particle filtrationStructural engineeringMachining process
The invention discloses a bag cage for a wrinkled filter bag and a processing technology of the bag cage, and relates to the technical field of bag cage processing, the bag cage comprises an external unit, the external unit comprises a top cover with a ventilation channel, the outer edge of the top cover is provided with a plurality of outer ribs, and the plurality of outer ribs are distributed in an annular array; the internal unit comprises a bottom support, a plurality of supporting arms are arranged on the peripheral side of the bottom support, a plurality of inner ribs are arranged on the inner edge of the bottom support, and the inner ribs are distributed in an annular array mode; the middle lining unit comprises a supporting ring, and a plurality of supporting rods are arranged on the peripheral wall of the supporting ring; the ends, away from the top cover, of the outer ribs are fixedly welded to the corresponding supporting arms, the ends, away from the bottom support, of the inner ribs are fixedly welded to the top cover, and the supporting rings are clamped between the outer ribs and the inner ribs. The bag cage is supported by the inner ribs and the outer ribs, the structural strength of the bag cage is high, the bag cage is produced in a split manufacturing-matched assembling-welding fixing mode, welding points are located at the two ends of the bag cage, welding operation is more convenient at the end positions, and the production efficiency of the bag cage is improved.
Owner:江苏森隆环保科技有限公司
Layered magnesium-magnesium-based composite material plate as well as preparation method and application thereof
ActiveCN114134302AImprove performanceSolve the strength problemMetal rolling arrangementsMg compositeMagnesium matrix composite
The preparation method comprises the following steps: synthesizing an Al-TiB2 intermediate alloy containing nanoscale TiB2 ceramic particles through an in-situ reaction, adding the Al-TiB2 intermediate alloy into a magnesium alloy melt to obtain a TiB2 / Mg composite material, carrying out hot rolling to obtain a thin plate, alternately stacking the thin plate and a pure magnesium plate, and carrying out vacuum hot pressing sintering to obtain the layered magnesium-magnesium-based composite material plate. And the layered magnesium / magnesium-based composite material plate with excellent performance can be prepared through multi-pass hot rolling. In the macroscale, the ceramic particles are non-uniformly distributed in a layered manner, and in the microscale, the ceramic particles are uniformly distributed in the magnesium-based composite material layer. The strength, plasticity and toughness of the laminated composite material plate can be flexibly and accurately regulated and controlled by regulating and controlling the content of TiB2 particles in the laminated composite material and the interlayer spacing, the problem that the toughness of the composite material is mismatched is hopefully solved, and the method has a wide application prospect.
Owner:XI AN JIAOTONG UNIV
Preparation method of starch water-retaining agent with high gel strength
InactiveCN103333291BFast water absorptionStrong water absorption rateCis-Butenedioic AcidWheat starch
The invention discloses a preparation method of a starch water-retaining agent with high gel strength. The preparation method is characterized by comprising the following steps of gelatinizing wheat starch, preparing a sodium acrylate solution under an ice bath condition, adding maleic acid, N,N-methylene bisacrylamide, ammonium persulfate and a sodium acrylate solution into the gelatinized wheat starch to obtain a mixed solution, stirring the mixed solution for graft copolymerization to form a copolymerization product, pouring the copolymerization product into a tetrafluoroethylene board for drying treatment, and obtaining the starch water-retaining agent with the high gel strength, wherein maleic acid can be changed to kaoline or kieselguhr. According to the method, maleic acid, kaoline or kieselguhr serves as a raw material to prepare the starch water-retaining agent, so that the prepared starch water-retaining agent is high in gel strength, biodegradability, water absorption velocity and salt tolerance, and the preparation method is simple and non-pollution and can be used for industrial production.
Owner:HEFEI UNIV OF TECH
Metal foam composite material and preparation method thereof
The invention provides a metal foam composite material and a preparation method thereof. The metal foam composite material comprises an inner core layer and a metal layer arranged on at least part of the surface of the inner core layer, wherein the density of the metal layer is not lower than 90%, the inner core layer comprises metal and a hollow inorganic material, and the hollow inorganic material is selected from at least one of fly ash, Al2O3 hollow ceramic balls or hollow silicon carbide. According to the invention, the inner core layer of the metal foam composite material comprises the metal and the hollow inorganic material, the pores exist in the inner cavity of the hollow inorganic material, and the density of the metal layer of the metal foam composite material is not lower than 90%, so that the metal foam composite material is small in density, high in strength and excellent in energy absorption and buffering performance; and the preparation method of the metal foam composite material is simple and easy to implement, and the metal foam composite material can be efficiently prepared.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
A three-dimensional multilayer structure surface enhanced Raman substrate and its preparation method
ActiveCN109612976BSimple structureImprove good performanceRaman scatteringNanoparticleAtomic layer deposition
The invention belongs to the technical field of molecular recognition, and in particular relates to a surface-enhanced Raman substrate with a three-dimensional multilayer structure and a preparation method thereof. The surface-enhanced Raman substrate of the three-dimensional multilayer structure of the present invention comprises: a substrate; a ZnO seed layer grown on the surface of the substrate; a ZnO nanorod array grown on the ZnO seed layer; coated on the ZnO nanorod array Ag nanoparticle layer on the surface; Al grown on the surface of the ZnO nanorod array structure covered by the Ag nanoparticle layer 2 o 3 dielectric layer; deposited on the Al 2 o 3 Ag nanoparticles layer on dielectric layer. The present invention adopts the combination method of chemical method, magnetron sputtering and atomic layer deposition technology to prepare a new type of composite structure SERS substrate, the substrate structure includes a three-dimensional structure of the substrate, a core-shell structure, a sandwich structure, etc. SERS substrates with variable and rich structures are of great significance for the study of multiple SERS mechanisms and the expansion of SERS applications.
Owner:BEIHUA UNIV
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