548 results about "White powder" patented technology

The invention discloses a method for preparing nano barium titanate based on sol-gel synergistic hydrothermal reaction, which comprises the following steps: (1) dissolving barium acetate in an acetic acid aqueous solution to obtain a barium source solution; weighing tetrabutyl titanate according to the molar ratio of barium to titanium being greater than 1.25, and dissolving the tetrabutyl titanate in alcohol to obtain a titanium source solution; (2) uniformly mixing the barium source solution and the titanium source solution, preserving heat at 20-80 DEG C to obtain gel, drying and grinding to obtain white powder of the barium titanate precursor: (3) preparing a 2-4mol / L inorganic strong alkali aqueous solution, adding the white powder and a dispersing agent into the inorganic strong alkali aqueous solution, and fully stirring to obtain a barium titanate precursor suspension; and (4) transferring the barium titanate precursor suspension into a reaction kettle for hydrothermal reaction, and after the reaction is completed, washing, drying and grinding to obtain the nano barium titanate powder. The preparation method is low in cost, and the prepared nano barium titanate powder is uniform in distribution, spherical or sphere-like in morphology, small in particle size, 80-150nm in average particle size and good in particle crystallinity.

The invention discloses a titanium alloy uniform mixing identification method and device, and the method comprises the steps: obtaining an image in a mixer, marking the national standard sponge titanium particles pasted with titanium dioxide in the image in the mixer, and obtaining a marked image; training the Deeplabv3 + neural network model through the image in the mixer and the marked image to obtain a segmentation model; segmenting an image acquired in real time in the mixing process through the segmentation model to obtain a segmented image; preprocessing the segmented image, and calculating the ratio of the total pixel to the white powder pixel on the sponge titanium particles on the preprocessed image by using a threshold segmentation method; and when the proportion of the total pixels on the sponge titanium particles and the white powder pixels meets the preset uniform mixing condition, stirring is completed, and a titanium alloy mixture is obtained. According to the invention, the material mixing uniformity degree is accurately measured in real time, and the material mixing quality is improved.

The invention provides a modified doped lithium phosphorus sulfur chlorine solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolytes. The Al and Cl double-doping mode can improve the mixing proportion of ions in lattices of Li6PS5Cl and expand ion channels, so that the ionic conductivity of the Li6PS5Cl system electrolyte and the stability to lithium are improved, and the ionic conductivity of the prepared modified doped lithium phosphorus sulfur chlorine solid electrolyte is larger than 3 mS / cm. The modified lithium-phosphorus-sulfur-chlorine-doped solid electrolyte provided by the invention is grey white powder in appearance, is uniform and free of foreign matters, and shows an argyrodite type, and the space group of a crystal structure is F43m. The preparation method of the modified doped lithium-phosphorus-sulfur-chlorine solid electrolyte is simple, the precursor can be obtained only by performing ball milling for 8 hours, rare and scattered noble metals are not used, and the production cost is reduced.

The invention provides an antifouling self-cleaning fluorocarbon finish paint as well as a preparation method and application thereof, and particularly relates to the technical field of special coatings. The antifouling self-cleaning fluorocarbon finish paint is composed of a component A and a component B in a ratio of (80-87): 16, the component A is prepared from the following components in parts by weight: 560 to 580 parts of fluorocarbon resin, 30 to 35 parts of a first solvent, 20 to 40 parts of a second solvent, 180 to 220 parts of titanium dioxide, 90 to 110 parts of filler, 11 to 20 parts of a light stabilizer, 3 to 5 parts of a thickening agent and 13 to 28 parts of an auxiliary agent; the component B comprises the following components in parts by weight: 20-22 parts of fluorocarbon resin, 4-5 parts of a chain extender, 15-20 parts of a diamine curing agent, 15-20 parts of a polyamine curing agent and 25-35 parts of a second solvent. According to the finishing paint, on the basis of enhancing the self-cleaning capability, the weather resistance of a coating is improved, and the aging and damage of the coating are delayed, so that the service life of the coating is prolonged.

The invention provides titanium-containing anhydrous stemming for a blast furnace and a preparation method of the titanium-containing anhydrous stemming, and belongs to the technical field of refractory materials for the blast furnace. The titanium-containing anhydrous stemming for the blast furnace comprises the following raw materials: 40-60 parts of titanium corundum, 5-15 parts of silicon carbide, 10-20 parts of ferro-silicon nitride fine powder, 5-15 parts of titanium dioxide fine powder, 5-15 parts of vanadium-titanium slag fine powder, 5-10 parts of coke fine powder, 1-5 parts of monatomic silicon fine powder, 1-5 parts of ball clay micro powder, 1-5 parts of aluminum nitrate micro powder and 1-2 parts of magnesium alon micro powder. Gas-phase substances of Si (g), Al (g) and Mg (g) can be formed in the stemming at high temperature by the monatomic silicon fine powder and the MgAlON micro powder in the raw materials and react with CO and N2 in the environment to generate ceramic whiskers such as SiC, Si3N4, AlN and MgAl2O4, and the generated ceramic whiskers are distributed in a staggered manner and are filled in pores of the stemming, so that the high-temperature strength and the volume stability of the stemming are remarkably improved.

The invention provides a dolomite roasting method, a carbonization method, a calcium-magnesium separation method and a comprehensive utilization method. The comprehensive utilization method of dolomite comprises the following steps: performing dolomite roasting on dolomite powder to obtain calcined powder; sequentially carrying out digestion treatment and aging treatment on the calcined white powder to obtain an aging solution; carrying out carbonization treatment on the aging solution to obtain a carbonization reaction solution; carrying out solid-liquid separation on the carbonization reaction liquid to obtain heavy magnesium water and a first solid isolate; carrying out pyrolysis treatment on the heavy magnesium water to obtain pyrolysis reaction liquid; carrying out solid-liquid separation on the pyrolytic reaction liquid to obtain decomposition liquid and a second solid isolate; carrying out magnesium carbonate roasting on the second solid isolate to obtain magnesium oxide; and carrying out reduction treatment on the magnesium oxide to obtain magnesium metal and magnesium aluminate spinel. According to the invention, comprehensive utilization of dolomite resources is realized, no waste residue or waste gas is discharged, a main product is magnesium metal, and byproducts are light calcium carbonate, magnesium aluminate spinel and solid carbon dioxide.

The invention discloses a nitrogen-doped oxygen-vacancy-rich three-dimensional flower-shaped bismuth oxide electrocatalyst as well as a preparation method and application thereof, relates to the technical field of electrocatalysts, and solves the problems that a traditional bismuth oxide catalyst is insufficient in electron transfer capability and low in active site utilization rate. The preparation method comprises the following steps: dissolving bismuth nitrate, polyvinylpyrrolidone and sodium oleate in a mixed solvent of methanol and N, N-dimethylformamide, and stirring and dissolving to obtain a solution A; the preparation method comprises the following steps: dissolving 1, 3, 5-tri (4-carboxyl phenyl) benzene in a mixed solvent of methanol and N, N-dimethylformamide, and stirring and dissolving to obtain a solution B; and adding the B into the A, uniformly stirring, heating in an oil bath, reacting under magnetic stirring, cooling to room temperature, filtering, washing and drying the product to obtain white powder, calcining in a tubular furnace to obtain three-dimensional flower-shaped Bi2O3, putting in the tubular furnace, introducing argon, introducing ammonia gas, heating, and carrying out heat preservation reaction to obtain the electrocatalyst. The catalyst can be used for catalyzing nitrogen reduction synthesis ammonia reaction.

The invention belongs to the technical field of preparation and application of nano materials, and relates to a preparation method and application of amino-functionalized cerium oxide nano enzyme, and the preparation method comprises the following steps: adding 3-aminophenylboronic acid into a cerous nitrate hexahydrate aqueous solution to obtain a mixed solution; dropwise adding a sodium hydroxide aqueous solution into the mixed solution, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain milk white powder, namely the amino-functionalized cerium oxide nano-enzyme. The boron element is introduced in the preparation of the cerium oxide nano-enzyme, and the amino-functionalized cerium oxide nano-enzyme is prepared by adopting a simple one-step hydrothermal synthesis method, so that the nano-enzyme has good phosphatase-like activity, has high selectivity and sensitivity to LPS, and is short in detection time, high in sensitivity, low in detection limit, simple in preparation process and high in preparation efficiency; the product is good in quality, high in stability, environment-friendly and extremely wide in market prospect.

A preparation method of plant compound essential oil comprises the following steps: preparing mixed powder from dried lemon slices, mint and litsea coreana, carrying out carbon dioxide supercritical extraction, and collecting an extract; the preparation method comprises the following steps: dropwise adding a carboxymethyl-beta-cyclodextrin solution into a mixture of eugenol and thymol, carrying out ultrasonic treatment to obtain an ultrasonic mixed solution, standing, centrifuging, collecting supernate, and drying to obtain a white powdery inclusion compound; and adding lecithin, Tween 80, disodium pyrophosphate and deionized water into the extract, heating and stirring, continuing to add the inclusion compound, homogenizing to obtain a nano-emulsion, adding gelatin and propylene glycol, heating and preserving heat, and cooling to obtain the plant composite essential oil. The compound essential oil disclosed by the invention has antibacterial and antioxidant effects, and has relatively strong antibacterial ability on botrytis cinerea and penicillium germs, and the DPPH free radical scavenging rate is greater than or equal to 90%. According to the invention, the active ingredients of the essential oil are wrapped by carboxymethyl-beta-cyclodextrin and synergistically embedded by lipidosome through a nano-embedding technology to realize slow release, so that the antioxidant and antibacterial properties are effectively prolonged.

The invention provides powder spraying equipment and method for a vacuum magnesium smelting furnace. The method comprises the steps that inert gas in an inert gas storage device is conveyed into a silicon powder bin and a calcined white powder bin through an inert gas conveying pipeline assembly; when the air pressure in the silicon powder bin and the air pressure in the calcined white powder bin reach the preset air pressure, silicon powder in the silicon powder bin and calcined white powder in the calcined white powder bin are conveyed into a spray gun through a powder spraying pipeline assembly; the inert gas is used as a carrier, and the silicon powder and the calcined white powder are sprayed into a molten pool in the vacuum magnesium smelting furnace through the spray gun. By utilizing the method, the problems of low mechanization degree, low per unit yield, high energy consumption and serious pollution in the existing magnesium smelting method can be solved.

The invention relates to an ultrahigh-whiteness and yellowing-resistant glass fiber reinforced halogen-free flame-retardant polyamide material, which is characterized by being prepared from the following raw materials in percentage by weight: 48 to 73.6 percent of PA6 slices, 0 to 6 percent of chopped glass fibers, 8 to 15 percent of nitrogen flame retardants, 14 to 20 percent of glass fiber powder, 0.1 to 2.2 percent of yellowing-resistant additives, 0.3 to 0.8 percent of wetting agents and 5 to 8 percent of titanium dioxide. The glass fiber reinforced halogen-free flame-retardant polyamide material provided by the invention has the characteristics of ultrahigh whiteness and yellowing resistance.

The invention belongs to the technical field of digital ink-jet printing, and particularly relates to water-based high-covering quick-drying white ink and a preparation method thereof, expensive nano-scale titanium dioxide is replaced by a mode of compounding organic and inorganic light diffusion powder, so that the production cost is reduced; wherein the composite high-coverage white powder comprises modified nano calcium carbonate, organic silicon light diffusion microspheres and polymethyl methacrylate (PMMA) light diffusion microspheres, the modified nano calcium carbonate and the light diffusion powder can play a good extinction effect, the haze of the ink is well improved, meanwhile, the light transmittance of the ink is greatly reduced, the appearance of a product is more uniform, and the product quality is improved. And the overall performance is improved. Nano calcium carbonate is modified, and the crystal form is controlled after modification, so that the affinity of the nano calcium carbonate and organic microspheres is increased, the dispersity and interface contact strength of the nano calcium carbonate in an aqueous medium are improved, a uniform dispersion system is formed, the uniformity and stability of the white ink are improved, and the product performance of the white ink is further improved.

The invention provides a macromolecular phosphorus-nitrogen flame-retardant composite material as well as a preparation method and application thereof, and belongs to the technical field of flame retardants. The novel weather-resistant intumescent flame retardant is synthesized by introducing a metal catalyst, a polyfunctional group cross-linking agent and a synergist into a piperazine pyrophosphate and melamine phosphate system. A new method and a new formula are provided for an intumescent flame retardant system, the flame retardant effect of the phosphorus-nitrogen intumescent flame retardant in a polypropylene material is improved, the dispersity and the water resistance of the flame retardant in a base material are improved, the addition amount of the flame retardant is reduced, and the flame retardant efficiency is improved. And the migration resistance of the white powdery phosphorus-nitrogen intumescent flame retardant in a dark polypropylene material is also improved. The invention has important application prospects in the field of flame-retardant materials, and can promote the development and innovation of the industry.

The invention provides insulating coating ink, an insulating coating, a preparation method of the insulating coating and a battery, and belongs to the technical field of insulating coatings, and the insulating coating ink comprises a prepolymer, a monomer, toner and a photoinitiator. In the toner, the mass ratio of phthalocyanine blue is 60%-90%, the mass ratio of phthalocyanine green is 0%-30%, and the mass ratio of titanium dioxide is 10%-40%. In the photoinitiators, the mass ratio of the cracking type free radical photoinitiator is 50%-90%, and the mass ratio of the hydrogen abstracting type free radical photoinitiator is 10%-50%; in the cracking type free radical photoinitiator, the mass ratio of the short-medium wave absorption initiator is 40-70%, and the mass ratio of the long-wave absorption initiator is 30-60%. In the insulating coating ink, the mass ratio of the photoinitiator is 1%-5%, and the mass ratio of the toner is 0.2%-1.5%. The insulating coating ink provided by the invention can improve the heat resistance, weather resistance, wear resistance and aging and yellowing resistance of an insulating coating.

The invention discloses low-endotoxin macromolecule PDRN, a preparation method and application. A freeze-dried white powder sample is obtained through fish testis pretreatment, fish sperm cell enzymolysis, deproteinization, ultrasonic pretreatment, nuclease enzymolysis, primary alcohol precipitation, redissolution and filtration, endotoxin control, secondary alcohol precipitation, alcohol washing and freeze-drying. Fragmentation is carried out by combining ultrasonic waves with nuclease enzymolysis, the use amount of enzyme can be effectively reduced, the molecular weight of the product can be accurately controlled, operation is easy, and the industrialization cost is low. The method comprises the following steps: carrying out enzymolysis on protamine cells through protease K, releasing protamine DNA, carrying out fragmentation on a PDRN sample by using ultrasonic waves and nuclease, and carrying out deep filtration and triton 114 washing to obtain the protamine with the molecular weight controllable interval of 500bp-4000bp; the content of endotoxin is less than or equal to 0.5 EU / mg, and the content of protein is less than or equal to 1.0%. The finished product is obtained by freeze-drying the PDRN wet solid, and the quality and the additional value of the product are improved.

The invention discloses a synthesis method of 5-nitrotetrazole sodium salt, and solves the problem of relatively large potential safety hazard in the synthesis process of 5-nitrotetrazole sodium in the prior art. The method for safely preparing the high-energy compound 5-nitrotetrazole sodium salt based on DAT comprises the following steps: adding 1, 5-diamino tetrazole into a certain amount of ice water and acid to dissolve 1, 5-diamino tetrazole; slowly dropwise adding a sodium nitrite solution into the ice-water mixture solution, and uniformly stirring at a certain temperature; slowly heating the mixture to a certain temperature, and reacting for a period of time to obtain filtrate; removing filtrate to obtain white powder; and dissolving the obtained white powder in acetone, filtering to obtain a solution, and removing the solvent to obtain the 5-nitrotetrazole sodium salt. The preparation method provided by the invention is simple, safe and mild in reaction condition; water is used as a solvent, so that environmental pollution is avoided, and environmental protection requirements are completely met; and dangerous intermediates such as tetrazole-5 diazonium salt and 5nitrotetrazole acid copper salt are not generated.

The invention relates to a method for controllably preparing a magnetic nanofiber film by current regulation and control magnetic field assisted electrospinning, which comprises the following steps: weighing PAN white powder, dissolving in a DMF organic solvent, continuously stirring by magnetic field force, and carrying out ultrasonic dispersion treatment on the solution by using an ultrasonic cleaner to prepare a uniformly dispersed PAN / DMF solution; adding Fe3O4 nanoparticles and a dispersing agent Triton X-100 with the same amount as the Fe3O4 nanoparticles into the prepared solution, and performing ultrasonic dispersion treatment to form a uniformly dispersed magnetic electrostatic spinning solution; according to the prepared magnetic electrostatic spinning solution, a thin and uniform high-performance magnetic nanofiber sample is prepared through a controllable magnetic field generated by a current control electromagnetic lens to assist an electrostatic spinning device, the thin and uniform high-performance magnetic nanofiber sample is placed in a drying box to be dried, and the thin and uniform high-performance magnetic nanofiber sample with the reduced deposition circle area, the increased thickness, the increased mechanical property, the improved magnetic property and the high-performance magnetic performance is obtained. The average diameter of the nanofibers is reduced and the nanofibers are uniform.

The invention discloses an ultraviolet-visible light-near infrared compatible broadband hyperspectral snowfield camouflage fabric, which is characterized in that the fabric comprises a high ultraviolet reflection coating and a 3D spacer fabric layer infiltrated with a moisture absorption coating, the raw materials of the high ultraviolet reflection coating comprise polyvinyl alcohol and an inorganic white powdery pigment, and the raw materials of the high ultraviolet reflection coating comprise polyvinyl alcohol and an inorganic white powdery pigment. The moisture absorption coating comprises a polymer coating and a water-absorbable metal salt layer. The invention further discloses a preparation method of the broadband hyperspectral snowfield camouflage fabric compatible with ultraviolet light, visible light and near infrared light and specific application of the fabric. The 3D spacer fabric serves as a base material, the moisture absorption coating is manufactured on the surface of the 3D spacer fabric firstly, then the high-ultraviolet-reflection coating is manufactured on one side or two sides of the fabric, the prepared spectrum simulation fabric has high ultraviolet reflectivity, obvious'moisture absorption valley (water peak) 'is also simulated at 1450 nm and 1930 nm, and snowfield camouflage in a broadband range can be better met.

The invention discloses a preparation method and application of an S-type heterostructure material with a plasma resonance effect, and the preparation method comprises the following steps: grinding a precursor material, calcining, collecting solid powder, carrying out reflux purification in deionized water, and collecting white powder; dispersing the white powder in a hydrazine hydrate solution, carrying out solvothermal reaction to obtain a faint yellow solution, repeatedly dissolving and precipitating by respectively using acidic and alkaline reagents, washing and drying to obtain a faint yellow solid product; uniformly grinding the faint yellow solid product, calcining the faint yellow solid product in an atmosphere furnace, and cooling to obtain orange solid powder; and adding the orange solid powder into an organic solvent of a precursor containing a tungsten source, and centrifuging, washing and drying after the solvothermal reaction is finished to obtain the S-type heterostructure material with the plasma resonance effect. The S-type heterostructure material with the plasma resonance effect has relatively high efficiency for simulating separation and removal of uranium species in post-treatment wastewater and shows relatively good anti-radiation stability.

The invention provides a protective coating for a fuel storage and transportation cabin and a preparation method thereof, the protective coating comprises a primer layer, and the primer layer comprises a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 20 to 40 parts of phosphorylated-sulfur heterocyclic modified epoxy resin, 0.1 to 1 part of dispersing agent, 0.1 to 1 part of flatting agent, 0.1 to 1 part of defoaming agent, 0 to 10 parts of n-butyl alcohol, 0 to 10 parts of xylene, 10 to 15 parts of zinc phosphate, 0.5 to 1.0 part of thixotropic agent, 10 to 15 parts of flaky filler, 20 to 35 parts of talcum powder, 5 to 10 parts of barite powder and 3 to 10 parts of titanium dioxide; the component B is prepared from the following raw materials in parts by weight: 99 to 100 parts of amino resin and 0.3 to 0.8 part of a catalyst. Phosphorylation-sulfur heterocycle is utilized to modify epoxy resin, a phosphating group (P-O-C) is generated, the lipophobicity is increased, an intrinsic anti-swelling network is constructed based on a sulfur / phosphorus atom covalent bonding epoxy skeleton, and by utilizing the three-dimensional shielding effect of phosphorus atoms and the high-density cross-linking characteristic of thioether bonds, the anti-swelling performance of the epoxy resin is improved. Fuel oil permeation channels are blocked from the molecular level, pollutant dissolution is inhibited, and it is ensured that the coating has good soaking resistance to fuel oil.

The invention provides a diketone polymer lithium adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: sequentially adding an ester group / hydroxyl polymer, acetoacetic acid ethylene glycol methacrylate and a cross-linking agent ethylene glycol dimethacrylate into a round-bottom flask, uniformly dissolving with a solvent 1, adding an initiator azodiisobutyronitrile, removing oxygen in an ice bath, and carrying out thermal initiation polymerization to obtain white powder; and washing with ethanol, and drying in vacuum to obtain the diketone polymer lithium adsorbent. The synthesized diketone-containing polymer adsorption material has high adsorption activity under the neutral condition, the adsorption capacity of the diketone-containing polymer adsorption material to lithium ions can reach 27 mg / g at most, the diketone-containing polymer adsorption material can selectively separate and recover the lithium ions from a mixed solution of lithium ions, sodium ions, potassium ions and the like, the adsorption material is prepared by adopting a precipitation polymerization method, and the adsorption efficiency of the adsorption material is greatly improved. The method has the advantages of high product conversion rate, simple operation, stable adsorbent performance and easy industrial application.

The invention belongs to the technical field of brominated flame retardant synthesis, and particularly provides a decabromodiphenyl ethane bromine distillation process chlorination bromine removal process, which comprises the following steps: S1, adding bromine into a reaction kettle, adding a catalyst, and mixing; cooling and dropwise adding molten diphenylethane; then heating, carrying out a heat preservation reaction, and cooling to obtain a brominated crude product; s2, S201, adding the brominated crude product obtained in S1 into a bromine steaming kettle, and heating; s202, chlorine is introduced, and the total amount of bromine and chlorine is detected; carrying out segmented control on the introduced chlorine according to the total amount of bromine and chlorine; s203, when the total amount of bromine and chlorine is reduced to a threshold value, stopping introducing chlorine, standing, cooling, and introducing nitrogen; s3, filtering the feed liquid in the bromine steaming kettle, washing and purifying for three times, and finally, centrifugally dewatering to obtain a faint yellow solid; and S4, adding the faint yellow solid into a high-temperature jet mill, performing high-temperature aging to obtain white powder, and then performing jet milling on the white powder to obtain a finished product. Physical distillation is replaced by chemical replacement, so that bromine is highly separated.

The invention relates to a preparation method and application of a hardness removal agent, and the method comprises the following steps: 1) alkali fusion reaction: mixing and fusing bauxite and NaOH to generate soluble sodium aluminate NaAlO2; 2) compounding silicon and aluminum: dissolving aluminum silicate in hot water, adding silica sol, stirring and mixing, and regulating the pH value to 11-12 by using NaOH; an aluminosilicate precursor gel is formed; 3) hydrothermal crystallization: transferring the aluminosilicate precursor gel into a high-pressure reaction kettle, and carrying out hydrothermal reaction to promote polymerization of a silicon-aluminum network; and 4) post-treatment: cooling aluminosilicate, centrifugally washing the aluminosilicate until the aluminosilicate is neutral, drying the aluminosilicate at 110 DEG C, and grinding the aluminosilicate to obtain a white powder product. A silicon-aluminum network structure of the hardness removal agent prepared by the method has regular pore channels, the highest calcium and magnesium removal rate can reach 90% or above, the hardness removal agent is high in anti-interference performance, is kept stable in a pH range of 6-12, is not influenced by common Cl <-> and SO4 < 2-> in water, and is high in stability.

The invention relates to a preparation method of a qtz-[Zn (mIm) 2] crystal, which comprises the following steps: mixing a zinc salt and 2-methylimidazole in deionized water, stirring to react, centrifugally washing, drying in vacuum to obtain a white powdery ZIF-8 crystal, and sintering the white powdery ZIF-8 crystal by spark plasma to obtain the qtz-[Zn (mIm) 2] crystal. Compared with the prior art, the method has the advantages that the qtz-[Zn (mIm) 2] crystal can be directly prepared from the ZIF-8 crystal, the qtz-[Zn (mIm) 2] crystal does not need to be prepared from a derivative of the ZIF-8, the preparation steps can be effectively simplified, and the production cost is reduced.

The invention relates to a preparation method of electrical-grade magnesium oxide for slowing down current leakage, belongs to the technical field of electrical-grade magnesium oxide, and solves the problems of poor insulativity, relatively high electrical leakage and the like in the actual use process of electrical-grade magnesium oxide. Comprising the following steps: step 1, weighing nano calcium oxide and lanthanide series metal oxide, putting the nano calcium oxide and the lanthanide series metal oxide into a quartz crucible, and uniformly mixing to obtain a primary mixed oxide auxiliary agent; 2, heating the mixed oxide auxiliary agent obtained in the step 1 in a muffle furnace, cooling to room temperature under a drying condition to obtain white powder, and grinding to obtain an oxide auxiliary agent; 3, absorbing ethyl acetate (EA), hydrogen-containing silicone oil and polycyclic aromatic hydrocarbon (D30), putting into a centrifugal tube, and uniformly mixing to obtain a liquid film coating auxiliary agent; the method has the advantages that the current leakage of the electrical-grade magnesium oxide with poor insulativity can be slowed down by adding the metal oxide aid under the condition that the original properties of the electrical-grade magnesium oxide are not changed. The method is simple, convenient and obvious in effect.

The invention is applicable to the technical field of fluorescent materials, and provides a near-infrared sulfide fluorescent material with ultra-long emission wavelength and a preparation method thereof, the general chemical formula of the fluorescent material is ZnGa2-2xCr2xS4, and x is more than or equal to 0.02 and less than or equal to 0.20; the preparation method comprises the following steps: weighing raw materials according to the molar ratio of Zn to Ga to Cr of 1: (2-2x): 2x, wherein x is more than or equal to 0.02 and less than or equal to 0.20; the preparation method comprises the following steps: weighing raw materials, adding a dispersing agent into the weighed raw materials, fully grinding until uniform white powder is obtained, presintering the ground white powder at 650-750 DEG C for 2-3 hours, introducing vulcanizing gas, firing in a vulcanizing environment at 850-950 DEG C for 2-4 hours, and slowly cooling to room temperature until cooling. The preparation method has the advantages of abundant raw material resource reserves, simple method, easy operation, low cost, good physical and chemical stability, ideal fluorescence lifetime, greenness, no pollution, strong applicability, wide emission bandwidth, large wavelength, and wide application in the technical field of near infrared spectroscopy.

The invention relates to an ultra-pure calcium fluoride crystal raw material and a preparation method thereof. The preparation method of the hyperpure calcium fluoride CaF2 crystal raw material comprises the following steps: (1) respectively weighing a calcium source and a fluorine source according to the stoichiometric ratio of elements in CaF2, and carrying out vacuum drying to remove adsorbed water and bound water so as to obtain a dehydrated calcium source and a dehydrated fluorine source; (2) mixing the dehydrated calcium source, the dehydrated fluorine source and absolute ethyl alcohol, and carrying out ball milling to obtain a white pasty mixed raw material; and (3) carrying out vacuum high-temperature heat treatment on the white pasty mixed raw material, carrying out solid-phase reaction on calcium ions and fluorine ions to generate calcium fluoride, cooling after the reaction is finished to obtain white powder, and grinding and crushing to obtain the ultra-pure calcium fluoride crystal raw material.

The invention belongs to the technical field of spinning auxiliaries for synthetic fiber processing, and particularly relates to polyethylene fiber FDY spinning oil as well as a preparation method and application thereof. The polyethylene fiber FDY spinning oil comprises a smoothing agent, a wetting agent, an emulsifier, an antistatic agent, a functional additive, deionized water and a wear-resistant agent, wherein the wear-resistant agent is one or more of phenyl dicarbazole phosphate, sulfurized isobutylene and triphenyl phosphate, and the mass percentage content of the wear-resistant agent in the spinning oil agent is not greater than 5%. By adding the wear-resistant agent with appropriate variety and appropriate dosage, not only can the wear resistance of the spinning oil be improved, but also the wettability and stability of the spinning oil can be improved through the synergistic effect of the components. When the spinning oil is used for polyethylene fiber FDY spinning production, the problems of broken ends, white powder and the like in the spinning production process can be obviously improved, and meanwhile it is guaranteed that a polyethylene fiber filament product obtained through FDY processing has excellent quality.

The invention is applicable to the technical field of luminescent materials, and provides a long-wavelength ultra-wideband sulfide near-infrared luminescent material and a preparation method and application thereof, the general chemical formula of the luminescent material is Ca < 1-x > CrxS, and x is more than or equal to 0 and less than or equal to 0.125%; the preparation method comprises the following steps that raw materials are weighed according to the chemical general formula Ca < 1-x > CrxS and the molar ratio of Ca to Cr in the raw materials being 1-x: x, x is larger than or equal to 0 and smaller than or equal to 0.125%, and the raw materials are compounds containing Ca and Cr elements; the preparation method comprises the following steps: weighing raw materials, adding a dispersing agent into the weighed raw materials, fully grinding to obtain uniform white powder, pre-sintering the ground white powder at 700-800 DEG C for 2-3 hours, introducing vulcanizing gas, and sintering in a vulcanizing environment at 800-900 DEG C for 2-3 hours to obtain the long-wavelength ultra-wideband sulfide near-infrared luminescent material. The luminescent material provided by the invention is excellent in performance, can effectively meet the requirements of near-infrared LED devices, and is widely applied to the fields of modern food quality analysis, biological imaging, biomedicine and the like.

The invention discloses a method for preparing titanium-doped iron phosphate from a titanium dioxide by-product ferrous sulfate, which comprises the following steps: (1) heating and dissolving the titanium dioxide by-product ferrous sulfate in a solvent to form a ferrous sulfate supersaturated solution; (2) adding a precipitant into the ferrous sulfate supersaturated solution for reaction, and cooling to separate out a mixed solid of ferrous sulfate crystals and titanium-containing precipitates after the reaction is finished; (3) taking the saturated ferrous sulfate mother liquor as a solvent, repeating the step (1) and the step (2), and combining the mixed solid obtained by repeating each time and the mixed solid in the step (2) to obtain a total mixed solid; and (4) dissolving the total mixed solid with sulfuric acid to form an iron-titanium solution, sequentially adding phosphoric acid, hydrogen peroxide and phosphorus salt into the iron-titanium solution, mixing, filtering to obtain a titanium-doped iron phosphate precursor, and heating, aging, filtering, washing, drying and calcining the titanium-doped iron phosphate precursor to obtain the titanium-doped iron phosphate product.