163 results about "Cyanate" patented technology

The invention relates to the field of copper-clad plates, and discloses a low-dielectric-constant high-performance copper-clad plate and a preparation method thereof.The preparation method comprises the specific steps that epoxy resin, phenolic resin, polyphenyl ether modified resin, modified nano silicon dioxide and the like are taken and mixed to obtain a resin glue solution; impregnating glass fabric in the resin glue solution to obtain a prepreg; laminating prepregs, and covering copper foil for hot pressing; the polyphenyl ether modified resin comprises epoxy resin, diallyl cyanate and fluorine-containing polyphenyl ether resin prepared by reaction of polyphenyl ether, bisphenol AF and benzoyl peroxide; the modified nano silicon dioxide is prepared by reacting allyl glycidyl ether, vinyltriethoxysilane and phenyltris (dimethylsiloxane) silane, then grafting with a phosphorus-containing intermediate to prepare a modified additive, and grafting with nano silicon dioxide, and the phosphorus-containing intermediate is prepared by reacting phenylphosphoryl dichloride and eugenol. The copper-clad plate with high flame retardance, high peel strength, heat resistance and low dielectric constant is prepared.

The invention relates to a resin composition and a preparation method thereof, a prepreg, a laminated board and a printed circuit board. The resin composition is prepared from the following components in parts by mass: 30 to 80 parts of modified bismaleimide prepolymer and 20 to 60 parts of cyanate ester resin, the modified bismaleimide prepolymer is prepared from the following raw materials: bismaleimide resin and a diamine compound, wherein the diamine compound contains a benzocyclobutene structure. In the resin composition, the modified bismaleimide prepolymer prepared from specific preparation raw materials and the cyanate ester resin are matched according to a specific proportion, so that the resin composition has a relatively low thermal expansion coefficient; meanwhile, the glass transition temperature and the thermal decomposition temperature are higher, the peel strength and the elastic modulus are higher, and the dielectric constant and the dielectric loss are lower, so that the high thermal stability, the size stability, the mechanical property and the dielectric property are better.

Disclosed are a build-up adhesive film for a flame-retardant FC-BGA packaging substrate, a preparation method therefor, and a use thereof, said film comprising, in parts by weight: 30-40 parts of an epoxy resin; 20-25 parts of a curing agent; 1-3 parts of a phenoxy resin; 0.05-0.1 parts of a curing accelerator; 80-100 parts of an inorganic filler, the inorganic filler being selected from one or two of modified boron nitride nanotubes and modified silica; the curing agent comprises a phosphorus-containing cyanate. The present invention uses the curing agent and the inorganic filler to form a composite flame retardant system on the basis of the epoxy resin, the phenoxy resin, the curing accelerator and other components to ensure the application of the build-up adhesive film in FC-BGA packaging substrates; the curing agent uses a phosphorus-containing cyanate, and when it burns, the phosphorus-containing group generates a phosphaphenanthrene group in the gas phase, which can form a stable structure and provide a free radical quenching function; in addition, the nitrogen-containing structure can also obtain a hindered amine structure having a quenching effect, forming a non-flammable gas, providing a gas phase dilution function, and effectively improving the flame retardant effectiveness of the build-up adhesive film.

The present invention relates to bio-based bisphenol monomer of formula I and process of preparation thereof. Specifically, the present invention relates to bio-based bisphenol monomers of formula I containing multiple alkoxyl groups, and polyphenols. The bisphenol monomers of formula I contain built-in methoxyl groups, which represent latent phenolic hydroxyl groups and could conveniently be de-blocked to phenolic hydroxyl groups leading to formation of polyphenols containing catechol / phloroglucinol units with anti-oxidant properties and are potentially useful in various applications like cosmetics, polymer additives and so on. Further, the present invention relates to process of preparation of polymers using bisphenol monomer of formula I as valuable building blocks wherein the high performance thermoplastics are poly(ether sulfone)s, poly(ether ether ketone)s, polyesters, polycarbonates, polyphosphonates, etc. and thermosetting resins are epoxies, cyanate esters, phthalonitriles, propargyl ethers, etc.

The invention discloses a distillation separation mechanism and method of a cyanate ester synthesis reaction device, and belongs to the field of cyanate ester synthesizing.The mechanism comprises a distillation assembly, a first collection assembly for collecting cyanogen chloride and hydrogen chloride, a second collection assembly for collecting bisphenol compounds and a third collection assembly for collecting cyanate ester, in the second collection assembly, a second condensation pipe is connected between a second collection cylinder and the distillation cylinder, a second condensation cylinder is sleeved on the pipe, a sliding plate in the second collection cylinder is connected with a piston rod and an insertion rod, and a tension spring is arranged between the piston rod and a piston cylinder. Pressure passes through the branch pipe to enable the piston rod to move downwards, the sliding plate to descend, the volume of the communication space to descend, boiling is slowed down, the insertion rod moves downwards to enable the second collection barrel to ascend, the condensation pipe to incline and liquid drops to flow back, and the cyanate collection amount is ensured.

The present disclosure provides a polymetallic-ore beneficiation and separation reagent, a preparation method therefor and use thereof. The preparation method for a polymetallic-ore beneficiation and separation reagent, includes following steps: (1) mixing a substance A, caustic soda, soda ash and sodium polysulfide, and then heating the same and performing a catalytic reaction, to render an intermediate product B, wherein the substance A includes one or more of urea, glycine, urea peroxide, ammonium cyanate and isocyanic acid; and (2) mixing the intermediate product B with trichloroisocyanuric acid, dichloroisocyanuric acid and 2-amino-3-(4-imidazolyl)propanoic acid, to render the polymetallic-ore beneficiation and separation reagent.

Described herein are liquid, organosilicon compounds that including a substituent that is a cyano (—CN), cyanate (—OCN), isocyanate (—NCO), thiocyanate (—SCN) or isothiocyanate (—NCS). The organosilicon compounds are useful in electrolyte compositions and can be used in any electrochemical device where electrolytes are conventionally used.

The invention discloses a light-emitting diode packaging material and a preparation method thereof, and relates to the technical field of light-emitting diodes. The method comprises the following steps: adding 4, 4 '-diaminodiphenyl ether into pyromellitic dianhydride for condensation polymerization to obtain a polyamic acid solution, and adding zinc borate nanowires and aluminum nitride powder to prepare an inorganic skeleton enhanced polyamic acid suspension; the preparation method comprises the following steps: reacting zirconium hydroxide sol with an aluminum sec-butoxide solution, and carrying out hydrothermal reaction and high-temperature calcination to obtain ZrO2at-alpha-Al2O3 core-shell particles; the preparation method comprises the following steps: pre-polymerizing 4, 4 '-diphenylmethane bismaleimide and bisphenol A cyanate ester to obtain a prepolymer; the preparation method comprises the following steps: mixing bisphenol A type epoxy resin, inorganic skeleton reinforced polyamide acid suspension, ZrO2at-alpha-Al2O3 core-shell particles and a prepolymer under vacuum, defoaming, injecting into a mold, heating, curing, cooling and demolding to obtain the product. Through the synergistic effect of triple modification, the high temperature resistance and lasting thermal stability of the packaging material are improved, and the packaging material is suitable for the field of light emitting diode packaging with high temperature resistance requirements.

To provide a thermosetting maleimide resin composition which has low melt viscosity during heating, has excellent flexibility of the cured film in its cured product, has low dielectric constant and dielectric loss tangent, has high glass transition temperature, has a low coefficient of thermal expansion, and has excellent long-term heat resistance and moisture resistance.SOLUTION: A thermosetting maleimide resin composition contains (A) a bismaleimide compound represented by the following formula (1) (in the formula (1), A represents a tetravalent organic group including a cyclic structure, B represents a divalent hydrocarbon group derived from a dimer acid skeleton, Q represents a divalent group having a fluorene skeleton or an indene skeleton, W is B or Q, n is 1 to 100, and m is 1 to 100, (B) a thermosetting resin having one or more maleimide group reactive functional groups selected from an alkenyl group, a maleimide group, an epoxy group, a cyanate group, a hydroxyl group, an acid anhydride group, a (meth)acrylic group and a thiol group, and (C) a reaction accelerator.SELECTED DRAWING: None

The invention discloses a cyanide-free cadmium plating method for an aerospace alloy steel forging machining part. The cyanide-free cadmium plating method comprises the following steps: sequentially carrying out polythiocyanate copper-zinc alloy plating, potassium chloride cyanide-free cadmium plating, hydrogen removal and hexavalent chromium passivation on an alloy steel matrix. The potassium chloride cyanide-free cadmium plating combined coating prepared by the preparation method disclosed by the invention is free from corrosion after being subjected to a neutral salt spray test for 1000h according to GB / T 10125-2012 Artificial Atmosphere Corrosion Test Salt Spray Test; according to GB / T 5270-2005 < GB / T 5270-2005 < GB / T > 5270-2005 < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / The potassium chloride cyanide-free cadmium plating combined plating layer prepared by the invention overcomes the defect that black spots are easy to appear when the potassium chloride cyanide-free cadmium plating of the existing aerospace alloy steel forging machine workpiece is carried out.

The invention relates to a method for regulating and deacidifying in a bioleaching process of low-grade copper sulphide ore, aiming at the problem of excessive acid caused by excessive oxidation of pyrite in a dump leaching system, a thiocyanate bactericide is added into the bioleaching system of the low-grade copper sulphide ore, and the thiocyanate bactericide is dissolved in a spray liquid of the bioleaching system, and is added into the spray liquid of the bioleaching system; under the catalytic action of mineral leaching microorganisms, oxidation of ferrous ions is enhanced, so that the oxidation-reduction potential of a solution is increased, oxidation of pyrite is intensified, acid accumulation is excessive, the thiocyanate bactericide can remarkably inhibit the activity of part of sulfur-oxidizing bacteria and even kill part of sulfur-oxidizing bacteria, and therefore the activity of ferrous oxide is reduced; compared with the prior art, the method has the advantages that the sulfur oxidation activity of microorganisms is greatly influenced, but the oxidation influence on iron is relatively small, so that the acid leaching is reduced under the condition that the copper leaching of the copper sulfide ore is not influenced, the copper leaching is not influenced, the acid leaching is reduced, the production cost is reduced, the environmental influence is reduced, and the like.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing dicyandiamide by urea pyrolysis with anti-scaling properties. The method includes a reaction process using urea, alkaline earth metal oxides, and a scale inhibitor dopant as raw materials. The scale inhibitor dopant includes at least one of silicon dioxide and titanium dioxide, and its weight accounts for 0.1% to 5% of the weight of the alkaline earth metal oxides. Experiments show that introducing a scale inhibitor dopant into the reaction system can alter the surface tension of the isocyanate melt, helping to improve the surface properties and rheological state of the intermediate melt. This reduces material adhesion and aggregation on the reactor wall, lowers the risk of scaling and clogging, and may even eliminate scale buildup on the reactor wall, thereby improving the stability of continuous production.

The application relates to the technical field of organic synthesis, and discloses a synthesis method of benzthiazuron, which comprises the following steps: step 1, addition reaction of alpha-methyl styrene and hydrogen chloride gas, and degassing to obtain a first reaction liquid; step 2, substitution reaction of the first reaction liquid and cyanate in the presence of a zinc chloride catalyst, and filtration to obtain a second reaction liquid containing isocyanate; and step 3, construction of an inorganic salt aqueous solution system with a density of 1.05-1.10 g / ml and a pH of 9-10, dropwise addition of the second reaction liquid into the system for condensation reaction with o-chlorobenzylamine, and post-treatment and refinement to obtain a target product. The non-phosgene route of chloro-isocyanate substitution is adopted, and the use of the toxic phosgene is completely avoided; the salting-out effect and interface control generated by the specific high-density salt solution effectively inhibit the isocyanate hydrolysis side reaction, and the reaction yield and product purity are obviously improved.

Disclosed in the present invention are a method for synthesizing deucravacitinib and intermediates thereof. An intermediate 2-methoxy-3-(1-methyl-1H-1,2,4-triazol-3-yl)aniline is prepared by subjecting 2,3-dichloronitrobenzene to an etherification reaction and a cyanation reaction to prepare 2-methoxy-3-nitrobenzonitrile; then reacting 2-methoxy-3-nitrobenzonitrile with ammonium chloride under the action of an alkali to generate 3-(2-methoxy-3-nitrophenyl)-1-methyl-1H-1,2,4-triazole; and finally, carrying out a catalytic reduction reaction to obtain the target product. Another intermediate N-(5-bromo-6-cyanopyrazin-3-yl)cyclopropanecarboxamide is prepared by subjecting 3-amino-6-chloropyridazine to a bromination reaction to prepare 3-amino-4-bromo-6-chloropyridazine, then reacting 3-amino-4-bromo-6-chloropyridazine with sodium nitrite under low-temperature condition and in the presence of an acid to generate a diazonium salt, and then adding a cyanate reagent to generate 4-bromo-6-chloro-3-cyanopyridazine; and finally carrying out a substitution reaction to obtain a target product (I). Deucravacitinib is obtained by subjecting these intermediates to a Buchwald-Hartwig coupling reaction, carrying out nitrile hydrolysis, and carrying out condensation.

The invention belongs to the field of sodium-ion batteries, and particularly relates to a manganese-based Prussian blue sodium-ion battery positive electrode material as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: a) respectively carrying out ball milling and crushing on a manganese source, metal cyanate and an antioxidant to obtain nanoscale particles; b) transferring nanoscale manganese source particles, metal cyanate particles and antioxidant particles into a ball-milling tank, then carrying out vacuum deoxygenation and sealing treatment, and then carrying out ball-milling induced chemical reaction to carry out solid-phase synthesis; and c) carrying out aging treatment on the product obtained in the step b), and washing and drying the product after the aging treatment is finished to obtain the manganese-based Prussian blue sodium ion battery positive electrode material. According to the invention, a ball-milling solid-phase synthesis method is combined with an effective post-treatment means, so that the micron-sized manganese-based Prussian blue sodium-ion battery positive electrode material with low defect and low crystal water content is synthesized, and the positive electrode material has relatively high specific discharge capacity and relatively good cycle stability.

The invention relates to a reaction kettle for preparing bisphenol A cyanate resin, and belongs to the technical field of resin preparation, the reaction kettle comprises a resin preparation box, two groups of crushing boxes are arranged on the upper surface of the resin preparation box, and cover plates are arranged on the upper surfaces of the two groups of crushing boxes. A threaded rod and an extension rod are driven to rotate through a motor, a rotating shaft and a scraping plate C are driven to rotate under the meshing connection action of a bevel gear A and a bevel gear B, a rotating rod is driven to rotate integrally under the clamping connection action of a clamping block and a clamping groove, and solid bisphenol A cyanate monomers and solid polyphenyl ether are cut and crushed; raw materials meeting particle conditions penetrate through the filter screen frame and fall to the lower part of the crushing box, a bisphenol A cyanate monomer and polyphenyl ether are rotationally dispersed more uniformly in cooperation with the dispersion frame, and the polyphenyl ether and bisphenol A cyanate monomer melt are mixed more uniformly under the rotation action of the stirring blades and the scraper A, so that the overall mixing efficiency is effectively accelerated.

The invention belongs to the technical field of resin materials, and particularly relates to a preparation method and application of low-dielectric dual-curing resin. According to the present invention, the naphthalene ring system in the 1, 5-naphthalene diisocyanate (NDI) structure has high molecular symmetry and low polarity, and provides a low dielectric constant; hydroxypropyl acrylate (HPA) is an organic compound containing a hydroxyl group and an acrylic acid group. The preparation method comprises the following steps: reacting 1, 5-naphthalene diisocyanate with hydroxypropyl acrylate according to a molar ratio of 1: 2 to obtain photocurable naphthyl acrylate (DP) with excellent low dielectric property, mixing a monomer of the naphthyl acrylate (DP) with bisphenol E cyanate (BP) to obtain resin, and mixing the monomer of the naphthyl acrylate (DP) with the bisphenol E cyanate to obtain the low-dielectric dual-curing resin. And the dielectric material is suitable for high-speed communication, new energy electronic packaging and other application scenes with high dielectric property requirements.

The invention relates to the technical field of organic synthetic chemistry, in particular to a preparation method and medical application of selenophosphate promoted by tris (pentafluorophenyl) borane. The preparation method of the selenophosphate ester comprises the following steps: under the action of tris (pentafluorophenyl) borane, taking seleno cyanate ester and phosphate ester as reaction raw materials, and carrying out stirring reaction under a certain temperature condition to obtain the selenophosphate ester compound. The synthesis method is mild in condition, does not need a metal catalyst and an oxidizing agent, and accords with the idea of green chemistry. The method also has the advantages of simplicity in operation, few byproducts, high purity and the like. In-vitro anti-inflammatory experiments prove that the selenophosphate compound disclosed by the invention has remarkable anti-inflammatory activity, can effectively inhibit the generation of inflammatory factors and cell inflammatory response, can be used as an active ingredient of anti-inflammatory drugs, and has a wide clinical application prospect.

The invention discloses a method for synthesizing α-thiocyanate-β-dicarbonyl compounds using a photocatalytic oxidation strategy, and the specific process is: β-dicarbonyl compounds, thiocyanate and photosensitizer are mixed and dispersed in a solvent, stirred under light source irradiation and air conditions, and the target product α-thiocyanate-β-dicarbonyl compounds is obtained by column chromatography separation or recrystallization after the reaction ends. The effectiveness of the present invention is embodied in that by using cheap and readily available thiocyanate as a thiocyanation reagent, using a green and environmentally friendly photocatalytic oxidation strategy, using molecular oxygen as an oxidant, it is achieved that metal-free, acid-free, alkali-free, and chemical oxidant-free β-dicarbonyl compounds are efficiently α-thiocyanated, and a novel and efficient approach is provided for preparing α-thiocyanated β-dicarbonyl compounds with wide application value. In addition, the reaction post-processing is simple, and the reaction effect can still be maintained when it is amplified to the gram level, with broad production and application prospects.

The invention discloses a method for evaluating seawater resistance of a cyanate ester-based composite material for a structural material, and belongs to the field of material performance testing, and the method comprises the following steps: S1, preparing a sample plate of the cyanate ester-based composite material for seawater resistance testing, and cutting the sample plate into a sample sheet I, a sample sheet II and a sample sheet III; s2, soaking the sample piece I, the sample piece II and the sample piece III, and sampling and testing at different time nodes; s3, obtaining a fitting equation about the water absorption rate, the interlayer shear strength and the glass transition temperature; s4, converting into a long-time fitting equation; s5, calculating an evaluation score; s6, comparing the evaluation score S with the required score of the allowable value of the cyanate ester matrix composite to obtain an evaluation conclusion; the evaluation score is calculated through fitting equations corresponding to the water absorption rate, the interlaminar shear strength and the glass transition temperature, and the method is used for predicting the seawater resistance of the cyanate ester matrix composite for the structural material.

The invention discloses a high-temperature-resistant epoxy molding compound for electronic packaging and a preparation method thereof, and relates to the field of electronic packaging materials. The invention aims to solve the problem that the epoxy molding compound prepared in the prior art is poor in high temperature resistance and cannot meet the higher working temperature requirement of a new generation of semiconductors. The invention discloses a high-temperature-resistant epoxy molding compound for electronic packaging. The high-temperature-resistant epoxy molding compound is prepared from the following components in percentage by mass: 10%-15% of o-cresol formaldehyde epoxy resin, 12%-18% of dicyclopentadiene cyanate ester, 0.1%-0.5% of copper acetylacetonate, 70%-80% of inorganic filler, 1%-2% of a coupling agent, 0.5%-1% of a release agent and 0.1%-0.5% of carbon black. A triazine ring structure with a high cross-linking characteristic is introduced into a resin matrix, so that the heat resistance is excellent; the prepared high-temperature-resistant epoxy molding compound for electronic packaging has the characteristics of high heat resistance, low dielectric constant, high breakdown field strength, high mechanical strength and the like, and is applied to the field of electronic packaging.

The invention relates to the technical field of cable preparation, in particular to a breakage-resistant photoelectric composite cable for wiring in a narrow space. Comprising a composite crosslinked polyethylene cable protection layer and an optical cable, and the composite crosslinked polyethylene cable protection layer comprises the following components in percentage by mass: 16-18% of precursor powder, 5-6% of a charring agent, 74.6-78% of PE, 0.6-0.8% of triallyl cyanate and 0.4-0.6% of dicumyl peroxide. The cerium nitrate, the yttrium nitrate and the sodium stannate are compounded to prepare the spherical rare earth nano material, and yttrium ions of the yttrium nitrate and the sodium stannate can finally form a crystal material with an approximately spherical polyhedral structure, so that the mechanical property of the composite crosslinked polyethylene cable protection layer is improved; according to the present invention, the composite material is not easily layered and cracked under the long-time pressure bearing condition, the microstructure of the composite material is changed so as to achieve the more compact structure, and the pressure resistance is improved to a certain extent.

The invention discloses a method for recovering precious metals from an extracted organic phase. According to the method for recycling the precious metal from the extracted organic phase, thiourea-thiocyanate (TU-SCN-) is adopted to cooperate with a complexing back-extraction agent A to conduct multi-stage back-extraction on the extracted organic phase O, and metal recycling in the extracted organic phase is achieved. According to the method for recovering the precious metal from the extracted organic phase, a thiourea-thiocyanate (TU-SCN-) synergistic complexing back extraction system is adopted for recovering the metal from the extracted organic phase, the back extraction efficiency is high, and the metal recovery rate is high (gt; and precious metals such as gold and silver can be recovered from an organic phase at a relatively low cost.

The present invention relates to a two-component thermally conductive composition comprising:-a composition (A) comprising 0 a silane-based polymer, and-a composition (B) comprising 0 at least 1% by weight of a filler (C), relative to the total weight of composition (B), said filler (C) providing at least 0.0025% by weight of moisture, relative to the total weight of composition (B), composition (A) and / or composition (B) further comprises at least one thermally conductive filler, and composition (A) and / or composition (B) further comprises: 0 of a rheological agent (r1) selected from amide waxes and / or 0 of a rheological agent (r2) comprising: from 1% to 40% by weight of a diurea (a) relative to the total weight of the rheological agent (r2), the invention relates to a composition comprising a rheological agent (r2) in the form of a diurea (a) obtained by the reaction of an aliphatic primary amine with a diisocyanate having a molar mass of less than 500 g / mol, and from 60% to 99% by weight of a specific plasticizer (b), relative to the total weight of the rheological agent (r2), in the form of a suspension of solid particles of the diurea (a) in the continuous phase of the plasticizer (b). The invention also relates to the use of a filler (C) having a specific moisture content for the cross-linking of a two-component composition comprising a composition (A) comprising a silane-based polymer and a composition (B) comprising the filler (C), without the addition of free water.

The application belongs to the technical field of fluorocarbon surfactant application, and particularly discloses a synthesis method of sodium perfluorohexylethyl sulfonate, which comprises the following steps: (1) under the protection of nitrogen, perfluorohexylethyl iodine, potassium thiocyanate and a phase transfer catalyst are added into water and stirred to react, an organic layer is separated, and rotary evaporation is performed to obtain perfluorohexylethyl thiocyanate; (2) the perfluorohexylethyl thiocyanate is added into water and heated, and then chlorine is continuously introduced to stir to react, and filtration separation is performed to obtain perfluorohexylethyl sulfuryl chloride; and (3) the perfluorohexylethyl sulfuryl chloride is added into sodium hydroxide water solution drop by drop, and stirred to react, and after filtration, water washing, recrystallization and drying, the sodium perfluorohexylethyl sulfonate is obtained. The sodium perfluorohexylethyl sulfonate has high yield and high purity, has excellent surface activity, has excellent compounding performance with a hydrocarbon surfactant, has very good thermal stability, salt resistance and chemical stability, and meets the environmental protection requirements.

An oil-ice semi-solid phase coprecipitation process for synthesizing Prussian blue positive electrode materials belongs to the field of battery technology. The process is: completely dissolving an organic metal salt in an oil-based organic solvent with a density greater than that of water; completely dissolving a metal cyanate in water, and then freezing it into a plurality of ice cubes; wherein the amount of substance of the organic metal salt is the same as the amount of substance of the metal cyanate; adding a plurality of ice cubes to the oil-based solution at a certain time interval for a plurality of times until the two react completely; after the product is stored for a period of time, washing with a certain mass fraction of an organic solution soluble in water, centrifuging, and vacuum drying to obtain a Prussian blue positive electrode material. The Prussian blue positive electrode material provided by the present invention is prepared by an oil-ice coprecipitation synthesis method in a low-water environment, which is beneficial to reducing the crystal water content of the material. Compared with other synthesis processes, the positive electrode material provided by the present invention has very few defects, uniform particles, and excellent dispersion.

The present invention relates to a method for curing a polythiourethane transparent casting substrate, comprising the steps of: providing a first component A comprising a polythiourethane prepolymer having iso(thio)cyanate end groups, wherein the prepolymer is prepared from at least one polythiol monomer and at least one polyiso(thio)cyanate monomer, used in an amount adapted such that the molar ratio R2 of NCX groups to SH groups is in the range of 2 to 35; providing a second component B comprising at least one polythiol monomer; mixing the first and second components A and B together and filling the resulting polymerizable mixture into a molding cavity; and the weight The present invention relates to a method comprising the steps of curing a composite mixture to obtain a polythiourethane transparent substrate, wherein the prepolymer is prepared by mixing at least one polyiso(thio)cyanate monomer and at least one polythiol monomer in initial amounts such that the initial molar ratio R1 of the NCX groups / SH groups of the monomers is in the range of 0.3R2 to 0.95R2; polymerizing the mixture; and adding an additional amount of at least one polyiso(thio)cyanate monomer to the mixture such that the molar ratio of the NCX groups / SH groups of all monomers used in the preparation of the prepolymer is equal to R2, where X is O or S.

The invention relates to an alkalescent total-iron flow battery electrolyte and a preparation method thereof. The lithium ion battery comprises a positive electrode electrolyte and a negative electrode electrolyte, the positive electrode electrolyte is a weakly alkaline aqueous solution of ferrocyanate, the negative electrode electrolyte is a weakly alkaline aqueous solution of ferric salt and an ethylenediamine di-o-hydroxyphenyl acetate complex, and the pH value of the positive electrode electrolyte and the pH value of the negative electrode electrolyte are kept consistent and are 8.0-11.0. In the negative electrode electrolyte, ethylenediamine di-o-hydroxyphenyl acetate is adopted as a complexing agent and forms a stable hexa-coordination structure with iron ions, so that the stability of the negative electrode electrolyte is enhanced; under the weak alkaline condition, generation of ferric hydroxide precipitates in positive and negative electrolyte can be effectively inhibited, and the stability of iron ions is improved; besides, the ligand molecules are large in size, the steric effect of the formed chelate is large, the transmembrane migration degree of iron ions / ferrous ions is reduced, the cycle life of the total-iron flow battery is greatly prolonged, and the total-iron flow battery can be widely applied to various aqueous flow batteries.

The invention discloses an epoxy insulation paste used in an ultralow temperature environment and a preparation method thereof, and belongs to the technical field of epoxy insulation paste. The epoxy insulating glue comprises a component A and a component B, the component A is prepared from the following components in parts by mass: 56 to 58 parts of epoxy resin, 17 to 19 parts of modified inorganic filler, 13 to 15 parts of organic silicon toughening agent, 3 to 4 parts of reactive diluent, 0.4 to 0.6 part of thixotropic agent and 0.3 to 0.5 part of wetting leveling agent; the component B is prepared from the following components in parts by mass: 6 to 10 parts of cyanate ester monomer, 2 to 4 parts of 4-methyl tetrahydrophthalic anhydride and 0.3 to 0.5 part of accelerant; the modified inorganic filler is hollow porous zirconium tungstate modified by a silane coupling agent; the organic silicon toughening agent is obtained by reacting triazine containing unsaturated bonds with tetramethyldisiloxane and then reacting with 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane and a silane ring body, and the organic silicon toughening agent is obtained by reacting triazine containing unsaturated bonds with the tetramethyldisiloxane and then reacting with the 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane and the silane ring body.

The utility model discloses a nickel-free gold-substituted plating layer structure with polythiocyanate pre-plated copper, which comprises a steel substrate, and a polythiocyanate pre-plated copper layer, an acid copper plating layer, a cupronickel tin plating layer, a gold-substituted plating layer and a nano polymer protective film which are sequentially prepared on the steel substrate from inside to outside. According to the nickel-free gold-substituted plating layer structure for pre-plating copper with polythiocyanate, the binding force of the plating layer is tested by a thermal shock method according to GB / T 5270-2005 Electrodeposition and Chemical Deposition Layer Adhesive Strength Test Method for Metal Cover Layer on Metal Matrix, the plating layer does not blister or fall off, the binding force meets the standard requirement, and the plating layer can be used as a plating layer for plating copper with polythiocyanate, so that the nickel-free gold-substituted plating layer structure for pre-plating copper with polythiocyanate can be used as a plating layer for plating copper. According to an acetate fog test carried out for 72 hours according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, no corrosives are generated on the surface of a plated part, and a plated layer has good corrosion resistance.