16results about How to "Solve easy oxidation" patented technology

The invention relates to the technical field of hot melt adhesive preparation, and discloses a modified rosin castor oil-based polyurethane degradable hot melt adhesive and a preparation method thereof. The modified rosin castor oil based polyurethane degradable hot melt adhesive is prepared from the following raw materials in parts by weight: 200 to 250 parts of castor oil modified polyurethane, 80 to 120 parts of modified rosin resin, 15 to 30 parts of functional modified nanoparticles, 10 to 15 parts of ammonium polyphosphate, 5 to 10 parts of aluminum hydroxide, 0.5 to 5 parts of plasticizer and 0.1 to 0.5 part of antioxidant. The rosin resin is modified by acrylic acid and then compounded with castor oil-based polyurethane resin, so that the adhesion, heat resistance, glossiness and hardness of the material are improved, the material has good antibacterial property by adding functional modified particles, and meanwhile, the flame retardant property of the material is further improved.

The invention relates to a moderator element for a nuclear reactor, the moderator element comprises a shell and a core block, the core block is a metal hydride moderator and is packaged in the shell, and the shell is a ceramic shell or a metal shell and is composed of a shell body and a cover body which are connected in a sealed mode. The invention also relates to a preparation method of the moderator element for the nuclear reactor. According to the moderator element for the nuclear reactor, the shell is prepared through the additive manufacturing forming technology, then the heat treatment technology is combined, densified packaging of the moderator is achieved, the problems that the moderator is prone to oxidation and corrosion in the using process are solved, and the requirement of the advanced nuclear reactor type for the moderator is met.

The application discloses a packaging method of a double-face bump packaging chip, which solves the defects of easy oxidation and electric leakage of the double-face bump chip, and ensures the quality and working stability of the double-face bump packaging chip. The method is characterized in that: after the wafer front surface operation is completed, the wafer front surface is reversely arranged after being bonded with glass, then the Si surface of the wafer back surface is ground and stress is released, then a SiO2 layer is formed on the surface of the Si layer, then a Ti / Cu layer is sputtered on the surface of the SiO2 layer, then the Cu is electroplated on the surface of the Ti / Cu layer to form an electroplated Cu layer, then the RDL corresponding to the pattern is formed on the wafer back surface through photoetching, then the Ti / Cu layer etching and the adhesive removing operation are carried out through photoetching, the back surface Cu manufacturing is completed, after the back surface Cu operation is completed, the wafer back surface is treated by plasma, then the RDL surface is protected by electroplating, after being reversely arranged again, the glass and the wafer are separated by UV light, and the complete single chip is formed by mechanical cutting.

This invention provides a dressing containing Ligusticum striatum microspheres and its preparation method, to solve the problem of safe and precise application of Ligusticum striatum extract or Ligustrazine in difficult-to-heal wounds; the dressing containing Ligusticum striatum microspheres and its preparation method, wherein the dressing is composed of Ligusticum striatum microspheres loaded with pHEMA hydrogel as the main body, wherein the Ligusticum striatum microspheres are formed by coating Ligusticum striatum extract or Ligustrazine with PLGA, and the pHEMA hydrogel partially encapsulates the Ligusticum striatum microspheres.

The invention discloses a preparation method of a carbon cage-in-cage / carbon coated nickel composite material with infrared stealth performance, an obtained product and application. The preparation method comprises the following steps: preparing nickel microspheres; roasting the nickel microspheres and urea in an inert atmosphere to obtain an NC / Ni composite material; and the NC / Ni composite material is placed in diluted hydrochloric acid for acid etching, and the cage-in-cage / carbon-coated nickel composite material is obtained. The obtained composite material is of a carbon-coated nickel modified carbon micron cage-coated nano cage structure, the process is simple, the cage-in-cage structure of the carbon cage can be accurately controlled, the defect that nickel elementary substances are easy to agglomerate is effectively overcome, and the composite material has good conductivity, electromagnetic wave absorption performance and low infrared emissivity and can be applied to the field of electrochemistry. Wide application values are realized in the fields of infrared stealth, electromagnetic wave absorption and the like.

The invention relates to the technical field of copper powder preparation, and provides a preparation method of liquid-phase in-situ self-assembly nano-shell-coated micron-core composite copper powder, a specific inducer is introduced into a liquid-phase reduction system, copper sulfate is adopted as a copper salt, and sodium hypophosphite or VC is adopted as a reducing agent, so that one-time forming of a micron-core-nano-shell composite structure is realized; the problems of non-uniform particle size distribution, high energy consumption, low yield and the like in a traditional copper powder preparation method are effectively solved; according to the prepared composite copper powder, the low-temperature sintering driving force brought by the nanometer shell layer is obtained while the process-friendly characteristics of being easy to filter, easy to wash, easy to dry and the like of micron powder are reserved, the initial sintering temperature can be reduced to about 150 DEG C, and the machining performance of the copper powder under the low-temperature condition is remarkably improved.

The invention discloses a continuous treatment system and method for low-temperature small cresol in coal gasification, and relates to the technical field of treatment systems, and the continuous treatment system comprises an alkali washing unit, an oxidation deodorization unit, a decoloration deodorization unit, an anti-oxidation unit, a rectification unit and an improvement unit. According to the continuous treatment system and method for the medium-low-temperature small cresol in coal gasification, through cooperative arrangement of the alkali washing unit, the oxidation deodorization unit, the decoloration and deodorization unit, the anti-oxidation unit, the rectification unit and the improvement unit, the effects of desulfurization, denitrification, decoloration, deodorization, organic matter removal and anti-oxidation on the medium-low-temperature small cresol in coal gasification can be achieved; the quality of phenol, o-cresol, m-cresol, p-cresol and xylenol products separated from medium and low temperature small cresol is greatly improved, the product quality is ensured, meanwhile, the stability of the products in the coal gasification medium and low temperature small cresol refining process is changed, and the oxidation resistance is improved.

The invention relates to a moderator-containing fuel element which comprises a shell and a core block, the core block is packaged in the shell and comprises fuel particles distributed in a moderator in a dispersed mode, and the shell is a ceramic shell or a metal shell and is composed of a shell body and a cover body which are connected in a sealed mode. The invention further relates to a preparation method of the fuel element containing the moderator. According to the fuel element containing the moderator, the shell is prepared through the hot pressing sintering or additive manufacturing forming technology, then the heat treatment technology is combined, densified packaging of the moderator and the fuel is achieved, and the problems that the moderator and the fuel are prone to oxidation and corrosion in the using process are solved; and the design requirements of advanced nuclear reactor types on moderator-containing fuel elements are met.

The present invention proposes a magnesium and magnesium alloy wire extrusion Y-type drawing composite forming method, which performs solid solution treatment on the magnesium alloy ingot, and prevents the precipitation of the second phase after water quenching. It is heated to above the recrystallization temperature, kept warm for a certain period of time, and then hot extruded in a horizontal extruder to extrude into a wire with a diameter of 3 mm; then the extruded wire is further heated, kept warm for a certain period of time, and transferred to a Y-type drawing die for drawing. The magnesium alloy wire extrusion Y-type drawing composite forming method provided by the present invention causes the magnesium alloy rod to first undergo severe plastic deformation at high temperature to obtain a 3mm fine-grained magnesium alloy wire, and then the 3mm wire is cooled and subjected to multiple Y-drawing passes, which solves the technical difficulties in the forming of magnesium alloy wires and realizes the precision forming of magnesium alloy wires with different compositions.

The anti-oxidation laser processing method for the solar cell comprises the steps that a semi-finished solar cell product is moved to a processing station, and a to-be-processed surface faces upwards; at least providing a protective gas flow field on the to-be-processed surface so as to isolate the to-be-processed surface from being in contact with air; and laser penetrates through the protective gas flow field to scan the to-be-machined surface according to a preset pattern, and machining is completed. Through the method, the protective gas flow field is formed on the to-be-processed surface of the solar cell semi-finished product, a protective gas atmosphere is provided for laser processing, and the technical problem of oxidation of a processing layer or a film layer adjacent to the processing layer caused by laser processing in the prior art is solved.

The invention discloses a praseodymium target and a preparation method and application thereof, and belongs to the technical field of nuclear target preparation. The praseodymium target comprises a titanium foil substrate, a praseodymium film deposited on the titanium foil substrate and a carbon film covering the praseodymium film. The preparation method comprises the following steps: preparing a substrate: cutting a titanium foil and fixing the titanium foil on a target frame; plating a praseodymium film by vacuum evaporation: placing the target frame fixed with the titanium foil in vacuum evaporation equipment, putting a metal praseodymium evaporation material, vacuumizing, adding evaporation current for evaporation, and depositing on the titanium foil substrate to obtain the praseodymium film; the titanium foil plated with the praseodymium film is transferred into vacuum magnetron sputtering equipment, the carbon target serves as a sputtering target, vacuumizing is conducted, magnetron sputtering is conducted in the argon atmosphere, the carbon film is deposited on the surface of the praseodymium film, and then the praseodymium target is obtained. The problem that the praseodymium material is prone to oxidation is solved, the praseodymium target meeting the nuclear physics experiment requirement is obtained, and the scheme is high in operability and practicability.

The present invention provides a composite anode plate for copper electrowinning, comprising a conductive beam, a fence-type anode plate bracket, a lead or lead alloy fixing frame, and an insulating sheath; a first lead alloy layer is provided on the surface of the conductive beam; the fence-type anode plate bracket is vertically connected to the conductive beam; the fence-type anode plate bracket is composed of a plurality of parallel anode composite rods; the lead or lead alloy fixing frame is vertically connected to the fence-type anode plate bracket; the insulating sheath is arranged in parallel on both sides of the fence-type anode plate bracket. The present application also provides a method for preparing the composite anode plate for copper electrowinning. The composite anode plate provided by the present invention is applied to copper electrowinning. Compared with the traditional Pb-0.06wt%Ca-1.2wt%Sn anode, the cell voltage can be reduced by 300mV, the service life can be extended by 2 times, the current conduction efficiency can be increased by more than 4%, and the current density can be increased to more than 3 times the original.

The invention discloses a packaging method of a double-sided bump packaging chip, which overcomes the defects that the double-sided bump packaging chip is easy to oxidize and leak electricity, and ensures the quality and the working stability of the double-sided bump packaging chip. The method is characterized by comprising the following steps of: after the operation on the front surface of a wafer is finished, bonding the front surface of the wafer with glass and then reversely arranging, grinding a Si surface on the back surface of the wafer, releasing stress, operating a SiO2 layer on the surface of the Si layer, sputtering a Ti / Cu layer on the surface of the SiO2 layer, electroplating Cu on the surface of the Ti / Cu layer to form an electroplated Cu layer, and forming an RDL (Reduced DL) of a corresponding pattern on the back surface of the wafer through photoetching, the manufacturing method comprises the following steps of: preparing a back surface of a wafer through photoetching, Ti / Cu layer etching and photoresist removing operation, performing plasma treatment on the back surface of the wafer after the back surface Cu operation is completed, performing protection on an RDL surface in a chemical plating manner, performing inversion again, performing de-bonding by irradiating UV light, separating glass from the wafer, and performing mechanical cutting to form a complete single chip.

The present application relates to a kind of nuclear reactor moderator elements, it includes shell and core block, wherein, core block is metal hydride moderator and is encapsulated in shell, shell is ceramic shell or metal shell and is made of sealingly connected shell and cover body.The present application also relates to the preparation method of the above-mentioned nuclear reactor moderator elements.According to the nuclear reactor moderator elements of the present application, the shell is prepared by additive manufacturing technology, and the densification of the moderator is realized by combining with heat treatment process, which solves the problems of easy oxidation and easy corrosion in the use of moderator, and meets the requirements of advanced nuclear reactor type for moderator.

The invention belongs to the technical field of biochar materials, and particularly relates to an iron-based modified biochar composite material and a preparation method and application thereof.The preparation method comprises the following steps that 1, biochar is prepared, specifically, rubber seed shells are smashed after impurities are removed, the smashed rubber seed shells are put into a ceramic crucible, the ceramic crucible is covered with a cover, pyrolysis and carbonization are conducted in a muffle furnace, and the biochar is obtained; (2) preparing nano zero-valent iron modified biochar: adding FeSO4. 6H2O and biochar into an ethanol water solution to obtain a mixture, adding a surfactant, carrying out ultrasonic treatment for 30-50 minutes, introducing nitrogen to blow off dissolved oxygen, and reacting in a constant-temperature oscillator for 24-26 hours; after the reaction is finished, adding a NaBH4 aqueous solution, and stirring for 30-40 minutes; performing centrifugal separation to obtain a solid, and performing cleaning and vacuum drying on the solid to obtain the iron-based modified biochar composite material. The iron-based modified biochar composite material prepared by the method can be used for adsorbing alternaria toxin.

The invention discloses an integrated batching system for neodymium iron boron production, and belongs to the technical field of neodymium iron boron production. The system comprises a plurality of material storage cylinders which are annularly distributed, a material mixing cylinder positioned below the material storage cylinders and a gas storage tank positioned in the center. And the gas storage tank, the material storage barrel and the material mixing barrel are connected through a pipeline to form an inert gas circulation loop. The storage barrel is of a conical barrel structure, a telescopic exhaust pipe is arranged in the center of the storage barrel, and the bottom of the storage barrel is connected with a discharging mechanism. Inert gas enters the material storage barrel from the gas storage pump to form cyclone airflow, so that the materials are effectively prevented from adhering to the wall and bridging; air flow is guided into a hollow auger shaft rod of the discharging mechanism through an exhaust pipe, finally enters the mixing barrel and returns to the air storage tank, and whole-process inert protection is achieved. The system is high in integration level, the problems of oxidation, bonding and bridging of rare earth raw materials in the storage and conveying process are solved, and the batching precision and the product purity are remarkably improved.