125results about How to "Reduce migration rate" patented technology

The invention discloses special N-phthalate reinforced soft polyethylene plastics for a circulation loop, which comprises the following ingredients by weight parts: 100 weight parts of PVC resin powder, 20 to 50 weight parts of N-phthalate plasticizers, 5 to 35 weight parts of auxiliary stabilizing agents, 0.5 to 5.0 weight parts of stabilizing agents, 0.1 to 2.0 weight parts of lubricating agents and 0.1 to 1.0 weight part of antioxidants. The invention also discloses a preparation method of the special N-phthalate reinforced soft polyethylene plastics for the circulation loop. The method comprises the following steps: carrying out high-speed mixing on ingredients; using a double-screw extruding machine for plastification; and using a single screw for cooling and forming to obtain rubber grains. The recipe of the invention is suitable for the manufacture of the circulation loop, particularly the varieties with high processing precision and long operation time and the varieties needing ray sterilization.

The invention relates to a lithium ion battery made of a hollow porous nickel oxide composite material, and the negative electrode material of the lithium ion battery is wrapped by an N-doped carbon layer. The lithium ion battery comprises a negative electrode plate, a positive electrode plate, a bath solution and a membrane, and is characterized in that the active material of the negative electrode plate is the hollow porous nickel oxide composite material coated by an N-doped carbon layer and formed by taking an ionic liquid as a coating agent, the grain diameter of the hollow porous nickel oxide composite material is 200 to 300 nm, and the surface of the hollow porous nickel oxide composite material is coated with the N-doped carbon layer thin film distributed evenly. According to the lithium ion battery provided by the invention, the negative electrode material has a hollow porous structure coated by the unique N-doped carbon layer, the grain diameter is small, the dispersity is good, the conductivity performance of the material is good, lithium-ion and electron have a fast diffusion rate and transmission rate in the material, the lithium ion battery constructed on the basis of the material has the characteristics of good discharging performance, high cyclic stability and high capability. The invention further provides a preparation method of the lithium ion battery.

The invention relates to lead-free electrocondution slurry used for a crystalline silicon solar cell back electrode. The lead-free electrocondution slurry used for the crystalline silicon solar cell back electrode consists of the following components in percentage by weight: 40-70wt% of silver plating copper powder, 2-10wt% of inorganic lead-free glass powder and 25-50wt% of organic carrier, wherein the organic carrier is the mixture of solvent, thickening agent and additive, and the prepared electrocondution slurry printing back electrode has the advantages of big thickness, small bulk resistance, excellent soldering resistance, strong welding adhesive force and silver ion migration resistance. Meanwhile, after cell pieces are subjected to series welding, an assembly has the advantages of higher stability and stronger anti-aging capability.

The invention discloses a growing method for a light-emitting diode epitaxial wafer, and belongs to the technical field of semiconductors. The growing method comprises the following steps: growing a low-temperature buffer layer, a high-temperature buffer layer, an N-type GaN layer, an N-type inserting layer, an active layer, an electron barrier layer and a P-type GaN layer in sequence on a substrate, wherein the growth temperature of the N-type GaN layer is greater than that of the N-type inserting layer which is greater than that of the active layer; the N-type inserting layer comprises a first sublayer, a second sublayer and a third sublayer which are laminated in sequence; the first sublayer is a superlattice structure formed by alternately laminating two GaN layers in which the doping concentrations of the N-type doping agents are different, and the doping concentration of the N-type doping agent in the first sublayer is smaller than that of the N-type doping agent in the N-type GaN layer; the second sublayer is an AlGaN layer or a superlattice structure formed by alternately laminating at least three AlGaN layers and at least three GaN layers; and the third sublayer is an InGaN layer. The N-type inserting layer in the invention plays a buffer role, and is beneficial for the growth of the active layer.

The invention discloses a particle source which comprises a base and a tip, wherein the base is provided with a gradual top, and the tip is provided wih a slight bulge on the base. The particle source disclosed by the invention can provide large beam flow density and small beam flow angle.

The invention relates to a nano iron phosphate hollow sphere/graphene composite material with graphene as a carrier, and the nano iron phosphate of a hollow spherical structure with the particle size 50-100nm grows on the graphene. The preparation method of the composite material provided by the invention comprises the following steps: carrying out a hydro-thermal reaction on a mixed liquid containing oxidized graphene, hexahydrate ammonium ferrous sulfate and phosphoric acid at 60-120 DEG C by using urea as a precipitator and adding a surfactant (lauryl sodium sulfate); washing the products;and carrying out vacuum drying, obtaining the nano iron phosphate hollow sphere/graphene composite material. The nano iron phosphate hollow sphere/graphene composite material provided by the invention has the advantages of unique nano hollow structure, excellent electrical conductivity and discharge stability, small particle size, good dispersity and suitability for the anode material of a lithium ion secondary electrode; and the preparation method based on a low-temperature hydro-thermal method is simple and economic, thereby being suitable for realization of industrial large-scale production.

The invention provides micro-nano compound silver-copper alloy welding paste used for low-temperature sintering and interconnection and a production method. The production method comprises the following steps: evenly mixing an organic solvent, a thickener, a dispersant, a coupling agent and a defoamer according to a certain ratio to produce an organic carrier of the micro-nano compound silver-copper alloy welding paste; and then evenly mixing silver-copper nano-alloy particles and silver microparticles which are produced through a chemical reduction method, and a certain amount of the organic carrier to obtain the micro-nano compound silver-copper alloy welding paste used for low-temperature sintering and interconnection. According to the micro-nano compound silver-copper alloy welding paste used for low-temperature sintering and interconnection and the production method, by adopting a solid solution alloy principle to dope a silver phase with copper atoms, the single-phase silver-copper alloy particles are obtained; the problem of oxidation of copper is solved, meanwhile, due to doping of the copper atoms, the atom diffusion rate is reduced, the problem of massive volume shrinkage of pure nanometer welding paste in sintering processes is solved, and meanwhile, cost reduction and yield raising are facilitated, so that the micro-nano compound silver-copper alloy welding paste used for low-temperature sintering and interconnection and the production method are suitable for mass production; and the micro-nano compound silver-copper alloy welding paste can be substituted for traditional Sn-based solder and pure nano-Ag paste in low-temperature connection of third-generation semiconductors, and has higher reliability.

The invention discloses a high selective separability nanofiltration membrane preparation method which comprises the following steps: (1) preparing a separation layer with high flux and a low inorganic salt removing rate; (2) preparing a separation layer with high negative charge density. The high selective separability nanofiltration membrane preparation method disclosed by the invention has theadvantages that the defined amount of dendritic polyfunctional group membrane material is added into a water phase solution to form a polypiperazine-amide separation layer with smaller osmotic resistance; then interface polymerization reaction is utilized to finish residual acyl chloride groups on the surface of an initial polypiperazine-amide membrane, reacting with strong-electronegativity compound containing hydroxyl or amino and utilizing a chemical bond mode to durably enhance membrane surface electronegativity to obtain a high selective separability nanofiltration membrane. In addition,as the introduced strong-electronegativity compound contains sulfonic acid groups or phosphate groups, an isoelectric point is lower than that of a general polypiperazine-amide nanofiltration membrane, and the electronegativity of the membrane surface can be kept under a lower pH value; thus, a wider pH value application range is obtained.

The invention discloses an N-doped carbon layer wrapped hollow-porous nickel oxide composite material, which adopts an ionic liquid as a coating agent to form an N-doped carbon layer after carbonization coated upon a nano nickel oxide surface of a hollow-porous structure with a particle size of 200-300 nm. The preparation method for the composite material comprises the steps as follows: dispersing carbamide, nickel chloride hexahydrate and sodium acetate into ethylene-glycol, conducting a solvothermal reaction and obtaining a precursor body of a spherical carbonic acid hydrogen nickel; dispersing the precursor body into a 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid, treating through adopting a solvothermal method, conducting a thermal treatment with argon gas to the product and obtaining the composite material. The N-doped carbon layer wrapped hollow-porous nickel oxide composite material provided by the invention adopts the unique nano hollow and porous structure, and is small in particle size and good in dispersity, excellent in electric conductivity and electric discharge stability, is applicable to anode materials of lithium ion secondary electrodes; the adopted solvothermal preparation method is simple, economical, and suitable for industrialized mass production.

The invention discloses a method for preparing nano copper powder in a micromolecular viscous medium. The method comprises the steps of: by taking a surface active agent, salt, a complexing agent, an antifoaming agent, an antioxidant, cupric salt, a reducing agent and deionized water as raw materials and according to the proportion of (0.001-95 percent) : (0.001-95 percent) : (0.001-80 percent): (0.001-75 percent): (0.001-70 percent): (0.001-75 percent): (0.001-70 percent): (0.001-98 percent), preparing the micromolecular viscous medium by using the surface active agent, the salt, the complexing agent, the antifoaming agent, the antioxidant and the deionized water; adding the cupric salt and uniformly mixing; adding the reducing agent and mixing; adding the deionized water to dilute so asto reduce the degree of viscosity according to a mass ratio of 1:0.5-10 of the total quantity of all materials abovementioned to the deionized water after the reaction completes; and obtaining nano copper powder through filter-pressing, deionized water washing, acetone washing and vacuum drying. According to the method disclosed by the invention, the raw materials selected in the invention are easily available, the manufacturing technique is simple and short, the production efficiency is high, the production cost and the energy compunction are low, and powder has low possibility of agglomeration and has good dispersibility, therefore the method is suitable for large-scale production and solves the problems of easy oxidation and easy agglomeration of the nano copper powder existing in the traditional chemical preparation method.

A degradable nontoxic seed coating agent comprises basic materials of water-soluble chitosan of 1.0-1.5wt%, gelatine of 0.05-0.1wt%, glycerol of 0.05-0.1wt%, PVA of 1.0-1.5wt% and plant extract of remainder, with the tensile strength of 18.7MPa, elongation of 10.1%, vapor transmission rate of 12.69g.mm/mm2.hr.mmHg, air permeability of (CO2)0.358*10-10ml.cm/cm2s.cmHg, air permeability of (O2)0.215*10-10ml.cm/cm2s.cmHg, hygroscopic rate of 47% and apparent viscosity of 290cp; uses water-soluble chitosan, PVA and plant extract to form seed coating film to not only meet performance requirement of conventional seed coating agents, but remarkably improve performance of film.

The invention discloses a long-acting anti-icing coating as well as a preparation method and application thereof, and belongs to the technical field of coating preparation. The preparation method comprises the steps of firstly, carrying out hydrophobic and oleophylic modification on porous powder, then carrying out oil storage treatment to enable silicone oil to fully enter pores of the porous powder, then mixing a diluent, resin, a curing agent and the modified porous powder according to a certain proportion to obtain an anti-icing coating, and carrying out drop coating, blade coating or spincoating on the anti-icing coating, and curing the coating to obtain the long-acting anti-icing coating. The anti-icing coating prepared by the invention has anti-icing property and durable wear resistance, is strong in paint film adhesion, easy in method operation, low in cost, simple and effective, is suitable for various substrate materials, and can be applied to the surface of an aircraft, theinner wall of refrigeration equipment and outdoor facilities in cold regions.

The invention provides an aluminum oxide ceramic. The aluminum oxide ceramic is prepared from aluminum oxide, calcined kaolin, bentonite, heavy magnesium carbonate, calcium carbonate, barium carbonate, glycerol, emulsified wax, titanium dioxide, zirconium dioxide and lanthanum oxide. The invention also provides a preparation method for the aluminum oxide ceramic. The preparation method comprises the following steps: mixing all the raw materials, adding water, carrying out ball milling, adding an aqueous polyvinyl alcohol solution with a mass fraction of 10%, continuing ball milling to obtain slurry, carrying out spray granulation to obtain a ceramic material, carrying out dry pressing molding, and performing roasting to obtain the aluminum oxide ceramic. According to the invention, Al2O3-SiO2-MgO-CaO composed of aluminum oxide, kaolin, bentonite, heavy magnesium carbonate and calcium carbonate is used as a basic system; barium carbonate, zirconium dioxide and lanthanum oxide are addedto serve as grain inhibitors; titanium dioxide serves as a solid solvent; glycerol and emulsified wax serve as dispersing agents; so the aluminum oxide ceramic with high bending strength is prepared.

The invention belongs to the technical field of semiconductors, and particularly relates to a semiconductor light emitting element. The semiconductor light emitting element comprises a substrate, and a nitride buffer layer, an n-type layer, a shallow quantum well layer, a multiple quantum well layer and a p-type layer formed on the substrate sequentially. The semiconductor light emitting element is characterized in that a composite structure layer is also inserted between the shallow quantum well layer and the multiple quantum well layer; the composite structure layer at least comprises a p-type doped GaN layer, an n-type doped GaN layer, and an isolation layer located between the p-type doped GaN layer and the n-type doped GaN layer. The feature that p-type impurities in the composite structure layer are migrated to the shallow quantum well layer and the multiple quantum well layer is used, light emitting of the shallow quantum well layer and the composite structure layer is promoted while the light-emitting strength of the multiple quantum well layer is enhanced, the light outgoing area of the semiconductor element is increased, and the light-emitting strength is further enhanced.

The invention relates to a low-expansion alloy and a preparation method thereof, and relates to the technical field of low-expansion alloys. According to the mainly adopted technical scheme, the volume fraction of annealing twin crystals in the low-expansion alloy is larger than or equal to 20%, and the linear expansion coefficient of the low-expansion alloy within the temperature range of -160 DEG C to 25 DEG C is 0.8*10<-6>/DEG C to 1.5*10<-6>/DEG C. The preparation method of the low-expansion alloy comprises the step of sequentially carrying out solution treatment, cold rolling deformationtreatment and annealing treatment on a low-expansion alloy body so as to obtain the low-expansion alloy, wherein in the cold rolling deformation treatment step, the total deformation of the alloy is 65-99%, and in the annealing step, the annealing temperature ranges from 800 DEG C to 900 DEG C, and the annealing time ranges from 5 min to 30 min. According to the low-expansion alloy, annealing twincrystals can be effectively introduced into the low-expansion alloy, so that the low-expansion alloy is strengthened on the premise that the linear expansion coefficient of the alloy is hardly influenced. The contradictory relation between the expansion performance and the strength of the alloy is fundamentally solved, and application of the low-expansion alloy in precise structural parts is facilitated.

The invention relates to an axial vibrating flat sheet membrane device capable of improving membrane flux and effectively controlling membrane pollution. When the membrane technology is used for microalgae recycle or water treatment, membrane pollution is an inevitable problem all the time. Membrane pollution will reduce membrane flux and reduce the filtering efficiency, besides, cleaning of a membrane will consume more manpower and materials, the membrane is damaged, and the service life of the membrane is shortened. The axial vibrating flat membrane device quickly vibrates up and down to generate shear force on the surface of the membrane, deposition of pollutants on the surface of the membrane can be effective prevented, accordingly membrane pollution can be slowed down, and the membrane flux can be improved. According to the device, the vibration amplitude can be adjusted by punching in a rotary plate in turn, the rotary plate and a motor rotary shaft are connected, the rotary plate rotates along with the motor rotary shaft, and the vibration amplitude can be increased from 1 mm to 40 mm. A motor is connected with a frequency regulator, and the vibration frequency of a vibrating film can be adjusted by the frequency regulator. When the vibration amplitude is set to be 1-40 mm, the frequency of a vibrating device can be adjusted to be 0-60 Hz. According to the device, only a membrane assembly is driven to vibrate up and down, an aqueous solution in a reactor does not need to be driven, and accordingly energy consumption for vibration can be reduced.

The invention discloses a light-emitting diode epitaxial wafer and a preparation method thereof, and belongs to the technical field of semiconductors. The light-emitting diode epitaxial wafer comprises a substrate, an N-type semiconductor layer, a carrier adjusting layer, an active layer and a P-type semiconductor layer, wherein the N-type semiconductor layer, the carrier adjusting layer, the active layer and the P-type semiconductor layer are laminated on the substrate in sequence; and the carrier adjusting layer is made from magnesium-doped aluminum-indium-gallium-nitrogen. The magnesium-doped aluminum-indium-gallium-nitrogen layer is inserted between the N-type semiconductor layer and the active layer, and an electronic barrier layer with wide forbidden band is formed, so that electronsare avoided from overflowing; simultaneously, hole consumption electrons are provided, so that the time that the electrons are injected into the active layer is prolonged; and moreover, built-in electric fields formed inside the active layer are reduced, so that the injection efficiency of holes is improved. Above all, the magnesium-doped aluminum-indium-gallium-nitrogen layer is inserted betweenthe N-type semiconductor layer and the active layer, and the distribution of carriers can be changed, so that the quantity of electrons injected into the active layer is matched with hole quantity, and finally the light-emitting efficiency of an LED is improved.

The invention discloses an antibacterial antifogging agent, and an antibacterial long-acting antifogging wet tissue prepared from the same. The antibacterial long-acting antifogging wet tissue is prepared from, by mass, 0.1-0.5% of a special film forming agent, 0.05-0.1% of an antibacterial agent, 0.01-0.05% of a chelating agent, 0.1-0.5% of alkyl glycoside, 0.01-0.1% of an emulsifier, 0.01-0.1% of a fluorocarbon surfactant, 0.01-0.1% of sodium chloride, 0.05-0.1% of citric acid, 10-40% of absolute ethyl alcohol, and the balance of water. The product prolongs the antifogging time to a great extent, and is suitable for various types of lenses.

The invention relates to a brightness improved LED luminescent layer epitaxial structure and a preparation method thereof, and belongs to the technical field of semiconductor device preparation. The brightness improved LED luminescent layer epitaxial structure comprises a substrate layer, a Buffer layer, a U type GaN layer, an N type GaN layer, a quantum well stress releasing layer, an improved brightness increasing LED luminescent layer, a P type AlGaN layer and a P type GaN layer. The improved brightness increasing LED luminescent layer comprises multiple normal quantum well layers, and multiple AlyGa(1-y)N/GaN/AlxGa(1-x)N type quantum barrier layers whose component and thickness are changed gradually in a reciprocal way. The thickness of the GaN layer in the AlyGa(1-y)N/GaN/AlxGa(1-x)Ntype quantum barrier layers is increased and then decreased with increase of the period number of quantum wells, the quantum barrier which is thicker in the middle can reduce the electron migration rate effectively, the number of electrons which cross the barrier is reduced, direct non-irradiation combination with cavities is avoided, and the light emitting efficiency is improved.

The invention relates to an anti-seepage concrete material in a plateau region and a preparation method of the concrete material. The anti-seepage concrete material in the plateau region is prepared from the following components, in percentages by mass: 18.6%-20.2% of cement, 6.1%-6.5% of water, 65.3%-71.9% of aggregate, 1.0%-2.0% of an alkaline activator, 0.1%-0.3% of a polycarboxylic acid high-efficiency water reducing agent and 2.0%-6.0% of an anti-seepage emulsion in the plateau region, wherein the anti-seepage emulsion in the plateau region includes paraffin. According to the concrete material and method provided by the invention, the seepage resistance of concrete in the plateau region can be effectively improved by a synergistic effect on concrete internal phase-change temperature control, anti-cracking operation and improvement of concrete compactness.

The invention discloses a preparation method of stimuli-responsive waterborne polyurethane emulsion with high water resistance, and relates to the technical field of preparation of polymer polyurethane emulsion. The preparation method includes the following steps that 1, a stimuli-responsive emulsifier is prepared, wherein a small-molecular initiator with disulfide bonds in the middle is synthesized, the synthesized disulfide-bond-containing initiator triggers preparation of a macromolecular initiator from hydrophobic monomers, the macromolecular initiator triggers preparation of the stimuli-responsive emulsifier from hydrophilic monomers; 2, the waterborne polyurethane emulsion with high water resistance is prepared, wherein the prepared stimuli-responsive emulsifier serves as an externalemulsifier for the preparation of the waterborne polyurethane emulsion, and then the stimuli-responsive waterborne polyurethane emulsion with high water resistance is obtained. According to the method, the reduction responsive emulsifier with the middle containing the disulfide bonds, and the stimuli-responsive emulsifier serves as the external emulsifier which can be used for the preparation ofthe stimuli-responsive waterborne polyurethane emulsion with high water resistance.