325 results about "Molybdic acid" patented technology

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The invention provides a visual detection method for interface water droplet induced electron generation in a high-temperature and high-pressure hydrocarbon-water system, and belongs to the technical field of in-situ analysis of electrons in mixed fluid. The detection method comprises the following steps: preparing a fused quartz capillary reaction cavity; loading a sample in a fused quartz capillary reaction cavity: sequentially inserting a thin capillary syringe filled with a silicomolybdic acid aqueous solution and a thin capillary syringe filled with a hydrocarbon liquid into the fused quartz capillary reaction cavity, and injecting the silicomolybdic acid aqueous solution and the hydrocarbon liquid; and carrying out visual detection on the water droplets. Through the visual fused quartz capillary thermal simulation experiment device, the color change of the water droplets at the interface of the silicomolybdic acid aqueous solution and the hydrocarbon fluid under the conditions of high temperature and high pressure is visually displayed, and the color characteristics of the water droplets are observed in real time by using a microscope, so that whether the water droplets induce electron generation or not is judged; the problem that electrons generated by water droplets cannot be directly observed and detected under high-temperature and high-pressure conditions is solved.

The invention relates to the technical field of electro-catalysis oxygen evolution, and particularly discloses a nickel-molybdenum foam composite oxygen evolution electro-catalysis material with high-valence nickel induced by molybdate radicals and a preparation method of the nickel-molybdenum foam composite oxygen evolution electro-catalysis material aiming at the problem that an existing oxygen evolution electro-catalysis material is insufficient in comprehensive performance or poor in performance stability. Soaking in a NaCl aqueous solution, and taking out; s2, mixing the nickel-molybdenum alloy foam with a K3 [Fe (CN) 6] aqueous solution, heating, and carrying out a hydrothermal reaction; and S3, finally, the nickel-molybdenum alloy foam is placed in the air or oxygen atmosphere and heated to 350-450 DEG C, heat preservation treatment is conducted for 2 h, and the nickel-molybdenum foam composite oxygen evolution electro-catalysis material is obtained. Molybdate anions are adopted as a sustainable induction source to be coupled with a NixOy / Fe3O4 heterogeneous interface, integrated construction is achieved on a nickel-molybdenum foam framework, and the nickel-molybdenum foam composite material has the advantages of being low in overpotential, high in stability, high in activity, high in binding force and long-term in durability and meanwhile being simple in process, easy to amplify on a large scale and the like.

The invention discloses a tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst, a preparation method thereof and an application of the tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst in degrading azo dyes by activating peroxymonosulfate. According to the method, a carbonate intercalated ternary LDH precursor is synthesized through a hydrothermal reaction, interlayer anions are replaced with nitrate and tetrathiomolybdate through ion exchange, and the target catalyst is obtained. In the catalyst, a unique Fe-Mg-Zn ternary metal laminate and a MoS < 2-> intercalation structure cooperatively construct a multi-active center, and MoS < 2-> is used as an electron donor to promote cyclic regeneration of Fe < 3 + > / Fe < 2 + >. The catalyst keeps ultrahigh activity in a wide range of pH (potential of hydrogen) of 3-9, can completely degrade 10 mg / L of acid orange 7 within 5 minutes, and is stable in structure and low in metal dissolution risk. The problems of low activity, slow Fe < 3 + > reduction, metal ion dissolution and the like under neutral and alkaline conditions in an advanced oxidation technology based on peroxymonosulfate are solved, and the method has important application value in the field of printing and dyeing wastewater treatment.

The invention discloses a post-treatment liquid and application thereof in an anode foil formation post-treatment process, and the post-treatment liquid comprises the following components in percentage by mass: 0.1-5% of a main film-forming agent, 0.05-3% of a synergistic stabilizer and the balance of a solvent, the main film-forming agent is selected from at least one of a waterborne polyurethane emulsion and a silane coupling agent; the synergistic stabilizer is selected from at least one of organophosphate, molybdate and tungstate. The main film-forming agent and the synergistic stabilizer are compounded to obtain the post-treatment liquid, on one hand, the synergistic stabilizer is firmly combined with an aluminum oxide substrate to carry out deep passivation treatment on an oxidation film on the surface of the anode foil, and on the other hand, the synergistic stabilizer is subjected to network crosslinking with a hydrophobic protection layer formed by the main film-forming agent; the three-dimensional composite protective film can effectively isolate water molecules, repair microdefects on the surface of an oxidation film, prevent the phenomena of specific volume attenuation, leakage current increase and the like of the anode foil, and improve the long-term working reliability of the capacitor.

The invention belongs to the technical field of photocatalysis and environmental governance, and particularly relates to a composite photocatalyst, in particular to a graphite-phase carbon nitride / molybdenum trioxide composite photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: S1, dispersing ammonium heptamolybdate in deionized water, adjusting the pH value of the solution to 0.5 + / -0.3 by using sulfuric acid, stirring and centrifuging the formed system, and carrying out vacuum drying to obtain a molybdic acid precursor; s2, mixing melamine and the molybdic acid precursor, calcining the formed mixture, and naturally cooling to room temperature after calcining is finished, so as to obtain the composite photocatalyst. Tests prove that the prepared catalyst has excellent cycling stability, still keeps high catalytic activity after being recycled for multiple times, and has a good industrial application prospect.

The invention relates to an application of a high-magnification nanocrystallization iron molybdate sodium ion battery positive electrode material, and the nanocrystallization iron molybdate sodium ion battery positive electrode material is an iron molybdate positive electrode material subjected to nanocrystallization optimization and is used for preparing a sodium ion battery. The reversible specific capacity of the nanocrystallized iron molybdate sodium ion battery positive electrode material in a sodium ion battery reaches up to 91 mAh / g, most of the capacity is kept under high current, and the capacity retention rate still can exceed 80% after 100 times of circulation. The nano-fibers are sintered into nano-particles, and the loading capacity can be controlled, so that the nano-fibers are used in the sodium-ion battery positive electrode material. Besides, by virtue of the greatly improved ion diffusion rate and structural stability of the nano-sized iron molybdate, high specific capacity, excellent rate capability and long cycle life can be realized at the same time, and the nano-sized iron molybdate is a high-performance sodium battery positive electrode material with great potential.

The invention belongs to the technical field of battery materials, and particularly relates to a method for determining iron phosphide in a phosphate positive electrode material, the positive electrode material and application. Comprising the following steps: preparing standard solutions of a series of phosphate positive electrode materials with different iron phosphide contents; respectively collecting and purifying magnetic substances in the standard solutions, and adding a quimocilidone reagent to determine the corresponding quinoline phosphomolybdate precipitate; drawing a standard curve according to the mass of the iron phosphide and the mass of the quinoline phosphomolybdate precipitate in the standard solutions with different iron phosphide contents; preparing a to-be-detected solution, collecting and purifying magnetic substances in the to-be-detected solution, adding a quinmolybdenum citronone reagent to determine the mass of the quinoline phosphomolybdate precipitate, and calculating the content of iron phosphide in the to-be-detected phosphate positive electrode material. By means of the method, the content of trace iron phosphide in the phosphate positive electrode material can be efficiently, accurately and quantitatively analyzed, the content of iron phosphide in the phosphate positive electrode material can be quantitatively regulated and reduced, and the electrochemical performance of the phosphate positive electrode material is improved.

The present application relates to the technical field of copper clad laminates, and discloses a copper clad laminate, a resin composition for the copper clad laminate, and spherical silicon and a preparation method therefor. The spherical silicon of the present application is composed of spherical silicon dioxide and zinc molybdate particles dispersedly grown on the surface of the spherical silicon dioxide in situ and has a diameter of less than 10 microns and a D50 of 0.6-6 microns. The content of zinc molybdate per unit area on the surface of the spherical silicon dioxide is 0.03-1 g / m2, and the size of the zinc molybdate particles is less than or equal to 400 nm. The preparation method comprises: enabling spherical silicon dioxide to come into contact with / be mixed with a soluble molybdate and a zinc salt in an aqueous reaction system; and reacting the soluble molybdate with the zinc salt in situ on the surface of the spherical silicon dioxide, so as to form spherical silicon chemically coated with zinc molybdate particles. In the present application, by directly synthesizing the zinc molybdate in situ on the surface of the spherical silicon dioxide by means of a hydrothermal method, the structural morphology of the obtained spherical silicon and the size of the zinc molybdate particles can be effectively controlled, thereby ensuring that the wear of a drill bit during the drilling of the copper clad laminate is effectively mitigated.

The application discloses a homopolymolybdate hybrid resistive random access memory material based on a tetraphenylstyrene molecule and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a mixture of 0.05 mmol of homopolymolybdate and 0.1 mmol of the tetraphenylstyrene molecule in 10 mL of water, stirring for 2 hours, adjusting the pH to 5.0 by using HCl to obtain a mixed solution; moving the mixed solution into a 25 mL stainless steel reaction kettle lined with polytetrafluoroethylene, reacting at 160 DEG C for 3 days, and obtaining a colorless block crystal after cooling; and after filtration, washing and drying, the homopolymolybdate hybrid resistive random access memory material based on the tetraphenylstyrene molecule is obtained. The method is simple and easy to operate, raw materials are easy to obtain, and the method is easy to realize. No harmful product is generated in the preparation process, and the method is an environment-friendly green synthesis. A multi-level controllable memory storage material is prepared, and the material can be applied to a multi-level memristor.

The invention discloses a preparation method of a metal organic framework catalyst and application of the metal organic framework catalyst in biomass furfural hydrogenation, and belongs to the technical field of catalytic hydrogenation. The preparation method of the metal organic framework catalyst comprises the following steps: S1, dissolving cobaltous acetate, L-glutamic acid and phosphomolybdic acid in distilled water to obtain a solution marked as a solution A; dissolving 1, 3, 5-benzenetricarboxylic acid (BTC) in ethanol to obtain a solution B, pouring the solution B into the solution A, stirring, and centrifuging to collect a precipitate; and S2, calcining the precipitate in an inert atmosphere to obtain the metal organic framework catalyst. The specific steps of applying the catalyst to the furfural hydrogenation reaction are as follows: adding the prepared catalyst and furfural into deionized water, performing heating and pressurizing reaction through a hydrogenation reaction kettle to obtain a solution, extracting the solution with ethyl acetate, and performing GC quantitative detection on the product after the extraction reaction. The method is mild in reaction condition, has an efficient furfural hydrogenation effect, and can completely convert FFA within 2 hours under the condition that 50 mg of catalyst is added.

The application relates to a catalyst for catalytically synthesizing propylene acid from propane and application thereof, and the catalyst is represented by the following general formula: Mo a V b Te c Nb d Ni e O x Wherein, a, b, c, d and e respectively represent the atom numbers of Mo, V, Te, Nb and Ni, and the molar ratio of a:b:c:d:e is 7.0-9.0:1.7-2.5:1.0-1.5:1.7-2.3:0.1-1.0, and the value of x is determined by the oxidation state of each element; Ni is introduced by nickel molybdate, Mo is introduced by a molybdate and the nickel molybdate, and the nickel molybdate is prepared by co-precipitation of a molybdate and a nickel salt in the presence of an organic acid. According to the application, the content of different valence metals on the surface of the catalyst can be adjusted by introducing nickel into the catalyst through nickel molybdate, so that the content of high-valence elements Mo 6+ , V 5+ and Ni 2+ in the catalyst and the oxygen vacancy are increased, and the redox capacity of the catalyst is enhanced.

This invention provides a self-supporting one-dimensional nanorod array composite material, its preparation method, and its application, belonging to the field of clean energy harvesting technology. The preparation method provided by this invention includes the following steps: mixing soluble nickel salt, soluble molybdate, and water, and carrying out a hydrothermal reaction to obtain a NiMo precursor; heat-treating the NiMo precursor and a modifier under a protective atmosphere to obtain the self-supporting one-dimensional nanorod array composite material. Experimental results show that the composite material prepared by the method provided by this invention has excellent electrocatalytic water splitting activity and operational stability, and photo-assisted synthesis further enhances the electrocatalytic water splitting activity of the composite material, making it applicable to solar-driven electrocatalytic water splitting.

The invention provides a corrosion inhibitor and a preparation method thereof, the corrosion inhibitor comprises an organic corrosion inhibitor and a metal salt corrosion inhibitor, the organic corrosion inhibitor comprises at least one of an organic amine compound and an organic acid salt compound, and the metal salt corrosion inhibitor comprises at least one of molybdate, titanate and zinc salt. The corrosion inhibitor provided by the invention is preferentially adsorbed on active sites on the metal surface through the chemical bonding effect of organic corrosion inhibitor molecules, so that corrosion is effectively blocked; meanwhile, the metal salt corrosion inhibitor acts with a metal matrix to form a compact protective film layer, and permeation of a corrosion medium is physically blocked. Due to the chemical and physical dual protection mechanism, the corrosion inhibitor has efficient, environment-friendly and long-acting corrosion inhibition performance on aluminum alloy, steel and the like in acid and salt mist environments.

The utility model discloses a flaky sodium hydroxide feeding device for molybdic acid production, which comprises an evaporation reaction kettle, a stirring mechanism and a pH sensor probe are arranged in the evaporation reaction kettle, the pH sensor probe is electrically connected with a pH tester, a feeding port is arranged at the top of the evaporation reaction kettle, a feeding pipe is mounted at the position of the feeding port, and the pH tester is electrically connected with the feeding pipe. The utility model relates to the technical field of molybdic acid preparation, which utilizes the impact crushing assembly in the storage hopper to crush flaky sodium hydroxide into small particles, and further feeds the small particles of sodium hydroxide into the feeding pipe through the spiral feeding assembly. The extrusion type material pushing assembly is started to feed granular sodium hydroxide in the feeding pipe into the evaporation reaction kettle through the turnover type plugging assembly on the lower portion, the structure is simple, the automation degree is high, operation is stable, and when feeding operation is not carried out, the turnover type plugging assembly at the lower end of the feeding pipe can plug the feeding pipe, so that the feeding efficiency is improved. And water vapor is prevented from entering the feeding pipe in the evaporation reaction operation process.

The invention discloses an electrode material which is simple in preparation method, high in performance and capable of stably producing hydrogen by electrolyzing water, and also discloses a preparation method of a photocatalyst for purifying wastewater by using a derivative of the electrode material. The preparation method of the electrocatalyst mainly comprises the following steps: etching a nickel metal substrate by using diluted hydrochloric acid; the preparation method comprises the following steps: preparing a first-stage product, dissolving the first-stage product with a bismuth source and molybdate in a reaction kettle, carrying out hydrothermal synthesis to obtain a hydrothermal product, carrying out high-temperature calcination on the obtained material to obtain a sample precursor and a part of byproducts, finally repeating the reaction once to obtain a high-activity electrode and related byproduct derivatives, mixing the two byproducts, carrying out high-temperature calcination, and grinding to obtain a second-stage product. According to the prepared catalyst, a bismuth source is introduced to serve as an additive, a NiMoO4 / Fe2 (MoO4) 3 composite film layer active phase is constructed on an NF substrate through a one-step hydrothermal-corrosion-growth method, the active phase and an NF framework are induced through a confinement effect to form strong interface bonding, the electron transfer rate is increased, and the electrode performance is remarkably improved by reducing the valence band position of the active phase. The preparation process is simple to operate, the morphology of the catalyst is controllable, and derived by-products generate higher economic benefits.

The present invention provides a water treatment agent composition comprising water, a fluorescent substance which is a tracer substance, and a specific corrosion inhibitor, and having good stability, as well as a water treatment method using the water treatment agent composition. [Solution] A water treatment agent composition comprising water, a fluorescent substance, and at least one of molybdate compounds, phosphate compounds, and zinc compounds as a corrosion inhibitor, wherein the pH is 8 or higher.

The application belongs to the field of antibacterial two-dimensional nanomaterial Mxene catalysts, and particularly relates to a monolayer W@MoS2 nanosheet as well as a preparation method and application thereof. The method comprises the following steps: 1) dissolving water-soluble molybdate and water-soluble tungstate in water to obtain a mixed solution; 2) adding a sulfur source and an organic solvent to the mixed solution, and then performing reaction after mixing, and drying to obtain a powder. The monolayer W@MoS2 nanosheet has a unique two-dimensional planar structure, a large specific surface area, and good optical and electronic properties, and has high light-heat absorption in the near-infrared two region, i.e., the light-heat conversion efficiency is improved. Meanwhile, the peroxidase-like activity of the monolayer W@MoS2 nanosheet material realizes efficient light-heat amplification, can treat methicillin-resistant Staphylococcus aureus infection, and avoids heat therapy damage to normal tissues.

The invention discloses a preparation method of bio-based trans, trans-muconic acid. Comprising the following steps: mixing a raw material containing galactose diacid with a catalyst, and reacting to obtain a product containing trans, trans-muconic acid; the catalyst is selected from at least one of ammonium paramolybdate, ammonium orthomolybdate, potassium heptamolybdate, sodium molybdate, sodium molybdate and molybdic acid. Compared with a traditional method for synthesizing trans, trans-muconic acid, the method provided by the invention has the advantages of simple steps, low cost and high conversion rate selectivity. Compared with traditional fossil energy-based raw materials, the reaction raw materials are derived from biomass, and the sustainable development view and the dual-carbon concept are met.

A layered double hydroxide (LDH) in a heterogeneous electrocatalytic sp 2 Application of C–H activation and CO2 carboxylation. The preparation method of a cobalt-iron molybdate intercalated hydrotalcite (CoFe-Mo LDH) catalyst is as follows: the CoFe-Mo LDH is prepared by a simple coprecipitation method. The CoFe-Mo LDH is used for a heterogeneous electrocatalytic sp 2 C–H activation and CO2 carboxylation. By changing the CoFe-Mo LDH intercalation of the CoFe-Mo LDH solvent environment, a series of mono-carboxylation and di-carboxylation products can be obtained, such as: in the case of benzene as a substrate and DMF as a solvent, a mono-carboxylation product benzoic acid is obtained; in the case of benzene as a substrate and MeCN as a solvent, a di-carboxylation product isophthalic acid is obtained. For the first time, the on-demand switching of the mono-carboxylation and di-carboxylation of phenyl substrates is realized, and this research not only provides a new heterogeneous electrocatalytic strategy to achieve the carbon neutralization target, but also successfully converts cheap and easily available chemicals into high-value and carbon chain growth carboxylic acids under mild conditions.

The invention belongs to the technical field of water electrolysis hydrogen production catalysts, and relates to a metal monatomic hydrogen evolution catalyst and a preparation method thereof.The catalyst comprises a large number of metal monatomic and a small number of metal clusters, metal is in an oxidation state in the catalyst, and crystalline PMA exists in the catalyst; c60 and PMA structures coexist in the catalyst; the preparation method comprises the following steps: respectively dissolving an acetylacetone metal complex, phosphomolybdic acid and fullerene in a toluene solution of a 4A type molecular sieve, respectively and sequentially mixing, magnetically stirring, washing and centrifuging to obtain the metal monatomic hydrogen evolution catalyst; the metal monatomic hydrogen evolution catalyst disclosed by the invention has excellent HER performance, a PMA-M-C60 catalyst with high loading capacity and high dispersion of metal monatomic bridging C60 and PMA is realized through a room-temperature synthesis strategy, and the catalysis cost is lower.

The invention discloses a preparation method of a voltage-breakdown-resistant anticorrosive functional filler, and belongs to the field of preparation of coating fillers. The boron nitride nanosheet is subjected to surface amination modification, then zinc molybdate grows in situ, finally, ester compound hydrolytic condensation is utilized for surface treatment, and the composite filler with multiple functions of physical shielding, efficient insulation and active corrosion inhibition is successfully constructed. According to the method, not only can the dispersity and interface bonding force of the filler in the resin be effectively improved and the defects of the coating be reduced, but also the insulation barrier characteristic of boron nitride and the electrochemical anti-corrosion effect of zinc molybdate can be synergistically exerted, so that the long-term corrosion resistance and high-voltage electric breakdown resistance of the coating in a severe environment can be remarkably enhanced.

The invention relates to the technical field of metal catalyst preparation, in particular to a nitrogen-doped carbon-loaded molybdenum-based monatomic catalyst and a preparation method and application thereof. The preparation method of the nitrogen-doped carbon-loaded molybdenum-based monatomic catalyst comprises the following steps: dissolving a carbon precursor and a template agent in deionized water, stirring to obtain a nitrogen-carbon precursor, then adding soluble molybdate, violently stirring, and then drying to obtain a molybdenum and nitrogen-carbon precursor solid mixture; then, a flash Joule heat technology is adopted, and the nitrogen-doped carbon-loaded molybdenum-based monatomic catalyst with a large number of wrinkled nanosheets and an excellent pore channel structure is synthesized under the coupling action of temperature and an electric field. The molybdenum-based monatomic prepared by the method has good activity in catalysis of hydrogen-free aqueous phase reforming of a lignin model compound and self-reforming hydrogenolysis of lignin.

This invention discloses a halogen-free flame-retardant polypropylene material and its preparation method, comprising 60-80 parts of polypropylene (PP), 4-8 parts of toughening agent, 15-25 parts of halogen-free flame retardant, 1-1.5 parts of antioxidant, 2-3 parts of light stabilizer, and 5-10 parts of modified graphene oxide flame retardant synergist. The modified graphene oxide flame retardant synergist is prepared by "nucleophilic substitution acyl chloride-nucleophilic substitution amidation-electrostatic interaction" using graphene oxide (GO), anhydrous sulfoxide, an amine compound H2N-R-NH2 containing at least two terminal primary amino groups, and molybdate. The -R- group is a divalent organic group used to connect the amide bond to the terminal primary amino group. The modified graphene oxide flame retardant synergist includes at least one amide bond -CONH-R-N- connected to the terminal primary amino group. The halogen-free flame-retardant polypropylene material provided by this invention exhibits excellent flame retardant properties while also improving its impact resistance and anti-dripping effect, and is safe and environmentally friendly.

The invention belongs to the technical field of concrete materials, and particularly relates to corrosion-resistant concrete for shield tunnel segments and a preparation method of the corrosion-resistant concrete. The concrete comprises sulphoaluminate cement, fly ash, slag powder, machine-made sand, gravel, a polycarboxylate superplasticizer, a defoaming agent, water and two key modified components, wherein the two key modified components comprise a layered double hydroxide-aluminum silicate nanosheet compound and a phosphate radical intercalation modified strontium molybdate slow-release corrosion inhibitor. During preparation, firstly, all the dry materials are put into a stirrer for dry mixing, then water and the additive are added for stirring to obtain mixed slurry, and a finished product is obtained after pouring, vibrating and steam curing. Wherein the two modified compounds are synthesized through a specific process, the former can adsorb corrosive ions and refine pores, and the latter can slowly release corrosion-inhibiting ions to protect reinforcing steel bars. The prepared concrete has excellent chloride ion penetration resistance, sulfate erosion resistance and carbonization resistance, the durability is remarkably improved, and the concrete is particularly suitable for shield tunnel segments in the severe corrosion environment.

The invention relates to a chromate-free passivator for a copper bar for a new energy automobile battery and a preparation method of the chromate-free passivator, and belongs to the technical field of metal surface treatment.The chromate-free passivator comprises, by weight, 6-16 parts of organic azole compounds; 10 to 30 parts by weight of molybdate; 2-10 parts by weight of a silane coupling agent; 4 to 12 parts by weight of a water-soluble polymer; 1-6 parts by weight of an accelerant; 0.2 to 2 parts by weight of a surfactant; and the balance of deionized water. According to the chromium-free passivating agent for the copper bar for the new energy automobile battery and the preparation method of the chromium-free passivating agent, the prepared chromium-free passivating agent for the copper bar for the new energy automobile battery eliminates the harm of hexavalent chromium to the environment and operators from the source, completely meets the strict requirements of global green manufacturing and environmental protection laws and regulations, and has a wide application prospect. And support is provided for the concept of full-life-cycle environmental protection of new energy automobiles, the copper bar surface treatment industry is promoted to develop towards the environment-friendly and sustainable direction, and the advantage of remarkable environmental protection performance is achieved.

This invention relates to a laser-engravable high-gloss black coating for automotive taillights and its preparation method, belonging to the field of coating preparation technology. The formulation of the laser-engravable high-gloss black coating is as follows (by weight): 40-60 parts polyurethane acrylate, 3-5 parts modified nano-bismuth oxide, 3-5 parts trimethylolpropane triacrylate, 1-3 parts 4-methylbenzophenone, 1-2 parts carbon black, and 0.5-1.5 parts leveling agent. The modified nano-bismuth oxide is prepared by treatment with ammonium molybdate solution and grafting with a silane coupling agent. Its layered structure synergistically enhances UV absorption efficiency and weather resistance with the molybdate layer. 4-methylbenzophenone and modified nano-bismuth oxide form a light absorption composite system, which, combined with the high cross-linking density network constructed by trimethylolpropane triacrylate, achieves narrow linewidth laser engraving precision. This invention solves the technical problems of low laser engraving precision, poor adhesion, and insufficient solvent resistance in traditional high-gloss black coatings, and is particularly suitable for precision marking applications such as automotive taillights.

The invention relates to the technical field of preparation of electronic components, and particularly discloses lead-free composite glass powder for side insulation of a resistor disc and a preparation method of the lead-free composite glass powder. The lead-free composite glass powder for side insulation of the resistor disc comprises the following raw materials in parts by weight: 90-110 parts of matrix glass powder and 10-30 parts of functional filler, and the matrix glass powder is vanadate-molybdate series lead-free glass. The lead-free composite glass powder is provided for the side face of the resistor disc, a compact insulating layer is formed after sintering, and the resistor disc has the advantages of being good in dielectric strength and good in durability.

The invention discloses a copper molybdate catalyst, a preparation method, application and a method for producing 4-propyl phenol. A preparation method of a copper molybdate catalyst for catalyzing demethoxylation of 4-propyl guaiacol comprises the following steps: mixing water-soluble molybdate, water-soluble copper salt and water to obtain a metal aqueous solution; and concentrating, drying and calcining the metal aqueous solution to obtain the copper molybdate catalyst. The preparation method is simpler to operate and more environmentally friendly, the prepared copper molybdate catalyst can be used for catalyzing 4-propyl guaiacol to remove methoxy so as to produce 4-propyl phenol, and the catalytic performance and stability are excellent.

The application discloses a preparation method of a photocatalytic material Bi / Bi2MoO6 / BiOBr for indoor formaldehyde degradation, which comprises the following steps: dissolving bismuth nitrate and sodium molybdate in ethylene glycol respectively to prepare bismuth nitrate solution and sodium molybdate solution; adding the sodium molybdate solution into the bismuth nitrate solution drop by drop to prepare a mixed solution, adding ethanol and BiOBr, stirring and ultrasonicating, transferring into a high-pressure reaction kettle, heating to 160 DEG C and keeping for 12 hours, drying the product to obtain Bi2MoO6 / BiOBr; dissolving the Bi2MoO6 / BiOBr in water and ultrasonicating, adding a sodium borohydride solution and stirring, washing with water and centrifuging, and drying the product to obtain Bi / Bi2MoO6 / BiOBr. The application provides a preparation method of the photocatalytic material Bi / Bi2MoO6 / BiOBr, which adopts a simple hydrothermal method and a sodium borohydride reduction method, and the ternary photocatalyst formed has excellent degradation effect on gaseous formaldehyde.