37results about How to "The principle of preparation is clear" patented technology

The invention discloses a preparation method of a nano carbon based loaded two-dimensional noble metal cluster composite material. According to the invention, nano carbon refers to nano carbon black. The method comprises the following steps: immersing the carbon black into a mixed solution of sulfuric acid and ammonium persulfate, and oxidizing the surface of the carbon black to carry an oxygen-containing radical; carrying out ultrasonic dispersion on a carbon black water solution subjected to oxidization treatment to form a carbon black suspension solution; dripping the carbon black suspension solution to the surface of a glass electrode and slowly drying; immersing the glass electrode into a Pb<2+> solution for a period of time and carrying out exchange reaction on Pb<2+> and the oxygen-containing radical on the surface of the carbon black; adsorbing the Pb<2+> to the surface of the carbon black through the oxygen-containing radical on the surface of the carbon black; carrying out electrochemical reduction on the glass electrode and reducing the Pb<2+> into PbO; immersing the glass electrode into a solution of noble metal ions so as to carry out replacement reaction on the noble metal ions and the PbO; and finally, depositing a two-dimensional noble metal cluster on the surface of the carbon black. The nano carbon based loaded two-dimensional PtRu cluster composite material prepared by the invention has ultrahigh catalytic activity on methanol oxidation reaction; and according to the invention, preparation methods of the nano carbon based composite material are hopeful to enrich, the structure of the material is optimized and the performance of the material is improved.

The invention relates to a method for preparing an AlCrTiN / WC-12Co composite coating on the surface of hot-work die steel, and belongs to a material surface modified composite treatment technology. The method is scientific and clear in preparation principle. The WC-12Co coating is prepared by spray-coating the surface of H13 hot-work die steel with hypersonic flame, so that the surface hardness ofthe matrix is increased, the wear resistance of particles is enhanced, the hardness gradient between the coating and the matrix is reduced and guarantee is provided for the use of an AlCrTiN coating.The AlCrTiN coating is prepared by plating the surface of the WC-12Co coating with cathode ions, the AlCrTiN / WC-12Co composite coating prepared by the method is obtained and has a nitride phase witha cubic structure, and the surface hardness, the oxidation resistance and the heat stability are further improved.

The invention discloses a steel pipe anti-corrosion coating and a preparation method thereof, and belongs to the technical field of chemical materials. The steel pipe anti-corrosion coating is prepared from, by weight, 5-12% of pigment, 3-8% of filler, 8-12% of dispersing agent, 6-12% of coalescing agent, 5-8% of defoaming agent, 2-6% of polyphenyl ether resin powder, 5-8% of butadiene styrene rubber, 3-6% of methylbenzene, 1-3% of plasticizer, 1-3% of coupling agent, 2-4% of auxiliaries, 1-3% of fire retardant, 2-4% of white carbon black, and the balance organosilicone modified epoxide resin.The preparation principle is clear, the method is scientific, the organosilicone modified epoxide resin has the advantages of being high in adhesive property, good in chemical reagent resistance andthe like, modified epoxy can enhance the water and ion permeation resistance of the coating, and the binding force between a metallic matrix and the coating is improved, so that the coating protectivecapability is improved, the high temperature resistance and the wear resistance of a steel pipe are enhanced, and the using safety of the steel pipe is greatly improved.

The invention discloses a cement grinding aid with high agglomeration performance, and belongs to the technical field of building materials. The cement grinding aid is prepared from the following rawmaterials in percentage by weight: 5-10% of diesel oil, 1-3% of methyl alcohol, 1-3% of nekal, 3-5% of polymeric alkylol amine, 3-8% of glycol, 5-12% of triethanolamine, 3-5% of molasses, 1-6% of sodium phosphate, 1-3% of sodium lignin sulfonate, 5-20% of sorbitol, 5-20% of sodium thiocyanate, and the balance of water. Through stirring, dissolving and still standing, the cement grinding aid is obtained. The preparation principle is clear, a method is scientific, compared with the prior art, the production cost is lower, a production process is simple, the admixture amount is low, the enhancement effect is good, the agglomeration performance of cement can be improved, the output of the cement can be increased, and the cement grinding aid is suitable for large-scale production.

The invention discloses a preparation method of a graphene-two-dimensional precious metal atomic layer composite material. The method consists of the following steps: ultrasonically disperse graphite oxide in an aqueous solution to form a graphene oxide solution, drop it on the surface of a glass electrode, and wait for it to dry slowly; immerse the glass electrode in a Pb2+ solution for a period of time, Pb2+ and graphite oxide ene exchange reaction, Pb2+ is adsorbed on the surface of graphene oxide; the glass electrode is electrochemically reduced, Pb2+ is reduced to Pb0, and graphene oxide is reduced to graphene at the same time; then the glass electrode is immersed in the solution of noble metal ions to make the noble metal ions A displacement reaction occurs with Pb0 to obtain a graphene-two-dimensional noble metal atomic layer composite material. The graphene-two-dimensional PtRu composite material prepared by the present invention has ultra-high catalytic activity for methanol oxidation, which is rooted in the strong coupling between graphene and two-dimensional noble metal atoms. The invention is expected to enrich the preparation method of the graphene composite material, optimize its structure, improve its performance and expand its application range.

A method for preparing biomedical magnesium alloy wire belongs to the technical field of metal materials. After melting magnesium and zinc, stirring and refining, casting them into alloy ingots, and then performing homogenization heat treatment on the alloy ingots, or without The heat treatment is directly carried out by equal-channel extrusion, and finally the magnesium-zinc alloy by equal-channel extrusion is processed into wire by multi-pass drawing. When the wire drawing is completed, the single-phase supersaturated solid solution structure is obtained, and its strength and elongation are higher than those obtained by direct drawing without equal channel extrusion, which not only meets the requirements of strength and plasticity, but also makes the material The corrosion resistance performance has been greatly improved.

The invention belongs to the technical field of LED production and manufacture, and relates to a flip-chip structure AlGaInP red light Micro-LED and a preparation method thereof. The flip-chip structure AlGaInP red light Micro-LED includes an n-GaAs ohmic contact layer 101, an n-AlGaInP expansion layer 102, a DBR layer 103, an n-AlInP confinement layer 104, a light emitting layer 105, a p- AlInP confinement layer 106, a p- AlGaInP extended layer 107, a p-GaP current spread layer 108, a p-GaP ohmic contact lay 109, a p-GaP coarse bonding lay 110, an ITO layer 200, a cured layer 300, a substrate400, an electrode layer 501, a first metal layer 502, a protective layer 600, an ODR layer 601 and a second metal layer 700 ; the structure is novel, the working principle is clear, and the light emitting efficiency is improved; As that bonding layer between indium tin oxide (ITO) and the ultraviolet cure optical adhesive is used as a bonding layer connecting the sapphire, the bonding yield can be improved, and the technical route of the invention is reliable, the technical foundation is mature, the raw materials are easy to obtain, and the invention is favorable for batch production.

The invention relates to a shock-proof and break-proof packaging box, and belongs to the technical field of packaging. The shock-proof and break-proof packaging box is composed of upper layer foam, aplastic frame and lower layer foam. The plastic frame has a flat H-shaped cross section, the upper layer foam is connected and fixed to the upper part of the plastic frame, and the lower layer foam isconnected and fixed to the lower part of the plastic frame. A storage groove is formed in the middle part of the upper layer foam. The shock-proof and break-proof packaging box has a novel structure,a clear preparation principle and a simple method, and an integrated structure is constituted by the plastic frame, the upper layer foam and the lower layer foam. Compared with a conventional foam packaging box, the shock-proof and break-proof packaging box solves the problems of low plasticity and low strength of the conventional foam box, the strength of the foam is increased, the anti-pressurecapability of the shock-proof and break-proof packaging box is improved, and the transportation demands of the shock-proof and break-proof packaging box are further met.

The invention relates to an ultraviolet light coating and a preparation method thereof and belongs to the technical field of preparation of engineering materials. The coating is prepared from the following raw materials in percentages by weight: 40-50% of polyurethane acrylate, 15-20% of unsaturated esters, 3-6% of a photoinitiator, 1-3% of a flatting agent, 2-8% of an organic pigment and the balance of water. The preparation principle is clear and the processing method is simple. The ultraviolet light coating provided by the invention is high in curing speed and great in degree of crosslinking, and the flexibility and rigidity of polyurethane are balanced. By adding the polyurethane acrylate into the ultraviolet light coating, the viscosity of a system can be reduced and the curing rate of the system can be improved, so that the ultraviolet light coating has good constructability and excellent mechanical properties, the dosage of a diluting monomer and an organic solvent can be reduced, the ultraviolet light coating reaches certain surface hardness, the wear resistance of the coating can be improved, and the service performance is further improved.