414 results about "FORMALDEHYDE SOLUTION" patented technology

The invention discloses boron-phosphorus co-doped phenolic resin-based hard carbon as well as a preparation method and application thereof. The preparation method of the hard carbon comprises the following steps: co-dissolving a phenol monomer and a boron source in a mixed solvent to obtain a phenol monomer mixed solution; a formaldehyde solution is added into the phenol monomer mixed solution for a polymerization reaction, and boron-doped phenolic resin is obtained; and washing and drying the boron-doped phenolic resin, adding a phosphorus source, fully mixing, and carbonizing in a protective atmosphere according to a temperature programming method to obtain the boron-doped phenolic resin. According to the material, based on the synergistic effect between boron and phosphorus elements and a resin-based hard carbon skeleton, the excellent conductivity of the material is guaranteed, meanwhile, defect sites in the material are greatly increased, and through tests, the reversible specific capacity of a sodium ion half-battery adopting the hard carbon negative electrode material is 290 mAh / g or above when the sodium ion half-battery is subjected to a constant-current charge-discharge test under the current density of 1A / g, and the reversible specific capacity of the sodium ion half-battery is higher than 290 mAh / g. And the capacity retention ratio can reach 94.8% after 1000 cycles, and the capacity retention ratio is still more than 60% under the current density of 5A / g.

The invention provides a preparation method and application of nitrogen-doped activated carbon for a ruthenium catalyst carrier, and the preparation method comprises the following steps: carrying out in-situ polymerization on aniline on the surface of nanocellulose by adopting an oxidative polymerization method to generate polyaniline, so as to obtain polyaniline-coated nanocellulose; the preparation method comprises the following steps: reacting phenol, an aminophenol derivative and a formaldehyde solution serving as raw materials under the action of a base catalyst to obtain modified A-stage phenolic resin; and uniformly mixing the polyaniline-coated nano cellulose with the modified resol, curing, crushing, carbonizing, activating, graphitizing, grinding and sieving to obtain the nitrogen-doped carrier activated carbon. The nanocellulose contains carbon, hydrogen and oxygen elements, gas can be generated in the preparation process of the activated carbon, and the pore structure of the activated carbon is expanded along with gas escape; a nitrogen-doped activated carbon pore wall is generated in situ by polyaniline around the occupation space of the nanocellulose, and the nitrogen element is beneficial to adjusting the size of active metal ruthenium particles and improving the activity and stability of the ammonia synthesis supported ruthenium catalyst prepared from the nitrogen-doped activated carbon pore wall.

The invention discloses a combined phenol-primary polyamidoamine phenol-amine resin nonionic demulsifier and a preparation method thereof.The preparation method comprises the steps that phenol M and primary polyamidoamine are mixed, a formaldehyde solution is dropwise added, a reaction product is diluted with methyl alcohol, and phenol M-primary polyamidoamine resin slurry is obtained; the preparation method comprises the following steps: mixing organic phenol N and formaldehyde, reacting under the catalysis of sodium hydroxide, and diluting a product with methanol to obtain phenol N phenolic resin slurry; dropwise adding the phenol N phenolic resin slurry into the phenol M-primary polyamidoamine resin slurry, reacting, refluxing to remove methanol and water to obtain combined phenol-primary polyamidoamine resin, and polymerizing the combined phenol (M-N)-primary polyamidoamine resin with epoxypropane and ethylene oxide in sequence under the catalysis of alkali metal hydroxide to generate R-PO-EO diblock demulsifier polyether. And cross-linking with a cross-linking agent to obtain the finished demulsifier. The demulsifier prepared by the invention has the characteristics of high dehydration speed and high final dehydration rate for thick oil emulsion in the Bohai Sea region, and especially can effectively reduce an emulsion layer of output crude oil for thick oil output liquid in a high-water-content exploitation period.

The invention discloses a nitrogen-containing carbon hollow sphere supported cobalt-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. According to the preparation method, ammonia water, tetraethyl orthosilicate, polyoxyethylene polyoxypropylene ether triblock copolymer, resorcinol and a formaldehyde solution are fully reacted in a mixed solvent of deionized water and ethanol by virtue of a template method, and the nitrogen-containing carbon hollow spheres are obtained after calcination and etching; then carrying out surface modification on the nitrogen-containing carbon hollow spheres, and uniformly loading cobalt metal by virtue of the structure guiding effect of hexamethyleneimine and sodium citrate dehydrate; the prepared nitrogen-containing carbon hollow sphere supported cobalt-based catalyst has abundant highly-exposed Co-N-C active sites, has wide substrate universality, has good catalytic activity and selectivity for amination reactions with various long-chain fatty aldehydes, fatty ketones, cyclic fatty ketones, aromatic aldehydes and ketones as raw materials, and can realize efficient catalytic amination reactions of carbonyl compounds.

The invention relates to the technical field of petrochemical proppants, and discloses a high-performance phenolic resin material which comprises the following components in percentage by weight: 60%-75% of modified phenolic resin, 5%-15% of a curing accelerator, 10%-20% of a flexibilizer, 5%-20% of a filler and 3%-10% of a multifunctional additive, the modified phenolic resin is prepared by the following steps: mixing a phenolic compound and a formaldehyde solution in a reaction kettle, adding a basic catalyst, and reacting to obtain a phenolic prepolymer; gradually adding a modifier containing a hydroxyl group, an epoxy group and a carboxyl group into the phenolic prepolymer, and simultaneously stirring to obtain a mixture; heating the obtained mixture for reaction to complete crosslinking modification reaction to obtain modified phenolic resin; and cooling the modified phenolic resin to room temperature for later use. By adopting the design of the multifunctional flexibilizer and the composite filler, the toughness and thermal conductivity of the material are improved, meanwhile, the curing efficiency is accelerated through the curing accelerator, and the industrial cost is reduced.

The present invention belongs to the technical field of composite materials, and specifically relates to a high-strength, durably flame retardant, seawater corrosion-resistant plastic-wood composite material, and a preparation method. The plastic-wood composite material of the present invention is primarily made of modified wood powder, a melamine formaldehyde resin, polyvinyl chloride and a binary hydroxyl-modified vinyl resin. The modified wood powder used in the present invention first undergoes a modification reaction using a melamine and formaldehyde solution on the surface of the wood powder under the catalytic action of citric acid, and is then dried. The modified wood powder enhances compatibility with the melamine formaldehyde resin. When preparing the plastic-wood composite material of the present invention, during a molding process, polyvinyl chloride partially self-crosslinks to form crosslinked polyvinyl chloride, causing the final product to have excellent static bending strength and tensile strength, and have durable flame retardancy. The flame retardancy performance does not significantly decrease after boiling in simulated seawater for 172 hours, and there is no obvious change on the surface. It is suitable for boardwalks in seaside scenic spots, etc.

The invention provides a preparation method of high-viscosity water-soluble melamine formaldehyde resin, which comprises the following steps: adding a first part of formaldehyde solution and water into a reaction kettle, fully and uniformly stirring, adjusting the pH value of the system in the reaction kettle, and controlling the reaction temperature in the reaction kettle at 25-30 DEG C; adding polyvinyl alcohol into the reaction kettle, raising the temperature in the reaction kettle to 48-52 DEG C, and keeping the temperature for 10-30 minutes; slowly raising the temperature in the reaction kettle to 90 DEG C, adding melamine and an environment-friendly accelerant into the reaction kettle, stirring and preserving heat for 8-12 minutes, and adding a melamine prepolymer modifier into the reaction kettle; adding a first part of formaldehyde solution into the reaction kettle, controlling the reaction temperature in the reaction kettle to be 92-95 DEG C, adding a second part of formaldehyde solution into the reaction kettle after reacting for 10 minutes, continuously stirring, and controlling the reaction temperature in the reaction kettle to be quickly reduced to 58-62 DEG C; and adding urea into the reaction kettle, naturally cooling to room temperature, and discharging glue. The melamino-formaldehyde resin prepared by the invention has the advantages of high viscosity, good water solubility, low free formaldehyde and longer storage life.

The utility model discloses a stirring and mixing device for formaldehyde production, and relates to the technical field of stirring equipment, the stirring and mixing device for formaldehyde production comprises a tank body, a rotating shaft is rotatably arranged in the tank body, the outer side of the rotating shaft is fixedly connected with a spiral blade, and the spiral blade is fixedly connected with the tank body. A second rotating cylinder matched with the spiral blade is arranged on the outer side of the spiral blade, a fixing disc is fixedly connected to the bottom end of the rotating shaft, a first rotating cylinder is fixedly connected to the top of the fixing disc, a plurality of openings are formed in the bottom of the first rotating cylinder, and drainage plates are fixedly connected to one sides of the openings. According to the stirring and mixing device for formaldehyde production, a solution at the bottom of the tank body is conveyed to the position above the solution under the action of the spiral blades, so that the formaldehyde solution and a polymerization inhibitor are mixed more rapidly and uniformly, the mixing efficiency is improved, the polymerization inhibitor is rapidly dispersed after flowing into the formaldehyde solution through a flow guide ring and a flow guide groove, and the situation that the concentration of the local polymerization inhibitor of the formaldehyde solution is too high is prevented; the uniformity and the stability of the solution are influenced.

The invention discloses a modified phenolic resin and a preparation method thereof, and belongs to the technical field of phenolic resins, the modified phenolic resin comprises the following raw materials by mass: 100 parts of phenol, 140-145 parts of a formaldehyde aqueous solution, 25-30 parts of gradient topology phosphonate, 15-17 parts of hyperbranched siloxane, 12-14 parts of a dynamic borate cross-linking agent, and 3-4 parts of hexamethylenetetramine. Through the synergistic effect of the gradient topology phosphonate, the hyperbranched siloxane and the dynamic boric acid ester cross-linking agent, the flame retardance, the thermal stability, the mechanical property and the dynamic function of the phenolic resin are comprehensively improved, and the environmental protection property of the phenolic resin is remarkably superior to that of a traditional technology. The experimental data fully verifies the inseparability and synergistic interaction among innovation points, and the technical combination and effect are non-obvious and accord with the creativity requirement of the patent. In addition, the application potential of the resin in the fields of aerospace, electronic packaging and the like further highlights the industrial value of the resin.

The invention belongs to the technical field of carbon materials, and provides tin-copper co-doped porous carbon and a preparation method and application thereof.The preparation method comprises the steps that A, raw materials are mixed, a hydrochloric acid solution is added to adjust the pH of a system to 5-6, stirring and cooling are conducted to the room temperature, then standing is conducted to form wet gel, freeze drying is conducted, and gel is obtained; wherein the raw materials comprise 0.8 g to 1.2 g of copper acetylacetonate, 4 g to 6 g of 2-aminobenzaldehyde, 4 g to 6 g of melamine phosphate, 4 g to 6 g of resorcinol and 8 ml to 12 ml of a formaldehyde solution with the concentration being 30 wt%; b, carbonizing the gel in inert protective gas to obtain copper-doped porous carbon; c, tin powder and the copper-doped porous carbon obtained in the step B are subjected to ball milling and mixing according to the mass ratio of 2: (7-12), then the mixture is placed in inert protective gas to be carbonized, and the tin-copper co-doped porous carbon is obtained. The prepared porous carbon material is high in CO2 electrocatalytic activity and has a wide application prospect.

The invention relates to the field of adhesives, and discloses an environmentally friendly urea-formaldehyde resin adhesive and a preparation method thereof. The environmentally friendly urea-formaldehyde resin adhesive comprises the following components in parts by weight: 45-60 parts of urea, 50-80 parts of formaldehyde solution, 10-25 parts of a modified additive, and 5-15 parts of modified polyvinyl alcohol; the modified additive is a modified additive prepared by grafting isophorone diisocyanate onto multi-walled carbon nanotubes loaded with nano-titanium dioxide and further sealing isocyanate with sodium bisulfite; the modified polyvinyl alcohol is modified polyvinyl alcohol grafted with sodium methyl silicate. The invention reduces the free formaldehyde content in the prepared urea-formaldehyde resin adhesive by adding the modified additive and the modified polyvinyl alcohol, and the prepared plywood has low formaldehyde release, is safe and environmentally friendly, and has excellent bonding strength and water resistance.

The utility model relates to the technical field of formaldehyde production, and discloses an emission treatment device based on formaldehyde tank area volatile gas, which comprises a formaldehyde tank body, a centrifugal fan is arranged on one side of the formaldehyde tank body, the output end of the centrifugal fan is fixedly connected with an adsorption box, one end of the adsorption box is provided with a purification assembly, and the other end of the adsorption box is provided with an air outlet. And the purification assembly comprises a purification box, a spiral pipe, an air outlet, a liquid outlet pipe, an atomization nozzle, a collection box, a flow guide pipe, a discharge pipe and a liquid discharge pipe. According to the emission treatment device based on the volatile gas in the formaldehyde tank area, by arranging the purification assembly, the volatile gas generated by a formaldehyde solution can be secondarily purified, it is ensured that the emitted gas meets the environmental protection standard, the formaldehyde solution in the formaldehyde tank generates the volatile gas, a centrifugal fan is started to suck the generated volatile gas into an adsorption box, and the adsorption box is used for adsorbing the generated volatile gas; the gas is adsorbed and filtered through the activated carbon plate in the adsorption box, and then is conveyed into the purification assembly for purification treatment.

The method comprises the following steps: adding a carbon source and a formaldehyde solution into a container, then adding a proper amount of urotropine and sodium hydroxide, heating and continuously stirring to fully dissolve the urotropine and sodium hydroxide, raising the temperature after dissolving, carrying out heat preservation and prepolymerization for a period of time, adding a proper amount of solvent and polyacrylic acid after prepolymerization, and uniformly stirring, thereby obtaining the carbon aerogel microspheres. A precursor solution is obtained; performing spray drying on the precursor solution to complete granulation to obtain organic microspheres; carrying out heat preservation and aging on the organic microspheres for a period of time to further carry out cross-linking reaction; and carrying out high-temperature carbonization on the aged organic microspheres in an inert gas atmosphere and high-temperature activation in a carbon dioxide gas atmosphere by using a fluidized bed to obtain the monodispersed carbon aerogel microspheres. The method is low in production cost and short in preparation period, the particle size of the carbon aerogel microspheres can be effectively regulated and controlled, and the performance of the carbon aerogel microspheres applied to the fields of catalysis, electrochemistry and the like can be effectively improved.

The present invention provides a DAM preparation method beneficial to reducing the content of diphenylmethane diamine. During the preparation of DAM by using the method of the present invention, the condensation reaction characteristic index R is controlled to meet specific requirements, which makes it beneficial to obtaining a DAM product with an appropriate content of diphenylmethane diamine in DAM. The method comprises the following steps: (S1) bringing aniline into contact with at least a part of hydrochloric acid for a reaction to obtain aniline hydrochloride; (S2) subjecting the aniline hydrochloride to a condensation reaction with an aqueous formaldehyde solution to obtain a condensation reaction solution, wherein the aqueous formaldehyde solution is introduced by a single addition or by multiple additions, and in step (S2), a part of hydrochloric acid is optionally added; and (S3) subjecting the condensation reaction solution to a transposition reaction to obtain a transposition reaction solution, wherein in step (S3), a part of hydrochloric acid is optionally added; and during steps (S1) to (S3), the condensation reaction characteristic index R is controlled to satisfy 1<R<1.05, more preferably 1.01<R<1.04.

The invention discloses a resin-based hard carbon composite material and application thereof in button type half-cell preparation. The method comprises the following steps: melting phenol, and adding a formaldehyde solution to prepare a mixed solution A; dispersing the carbon nano tube powder and hexadecyl trimethyl ammonium bromide in pure water, and grinding to obtain carbon nano tube dispersed slurry B; and adding the carbon nanotube dispersion slurry B into the mixed solution A to obtain a mixed solution C, adjusting the pH value to prepare a phenolic resin precursor solution, carrying out cross-linking curing to prepare a phenolic resin cured precursor, carrying out mechanical grinding, and putting the phenolic resin cured precursor into a tubular furnace to finally prepare the resin-based hard carbon composite material. Conductive carbon is introduced to the condensation polymerization end of phenol and formaldehyde, a communicated conductive network is formed in the composite material by regulating and controlling the material composition, the electron transmission distance between particles is shortened, the intrinsic conductivity of original resin carbon is improved, and the composite material has the advantages of high capacity, high first efficiency, high magnification and low ash content; wide application prospects are realized in the field of lithium ion battery negative electrode materials.

The invention belongs to the technical field of electro-catalytic materials, and particularly discloses an N / O co-doped carbon bowl electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing ammonia water, silicon alkoxide, alcohol and water to obtain a mixed solution; mixing the mixed solution, resorcinol and a formaldehyde solution, centrifuging to obtain a precipitation sample, and annealing the precipitation sample to obtain solid carbon nanospheres; the solid carbon nanospheres and an alkaline solution are subjected to an etching reaction, and an N / O co-doped carbon bowl electrode material is obtained; the time of the etching reaction is 90 to 100 hours. The prepared N / O co-doped carbon bowl electrode material is a metal-free carbon catalyst, and a prepared N / O co-doped carbon bowl electrode has high ORR activity, excellent 2e-selectivity and long-term stability, and has important significance for promoting acidic electrosynthesis of H2O2.

The invention relates to a preparation method and application of a melamine polymer hydrophilic modified PVDF (Polyvinylidene Fluoride) composite material. The preparation method comprises the following steps: dispersing hydrophobic PVDF nanoparticles in water, and adding an organic solvent to form a white uniform PVDF emulsion S1; dissolving melamine in a formaldehyde aqueous solution, or additionally adding a metal salt to form a clear solution S2; s1 is added into S2, and the mixed solution is kept in a uniform emulsion state; the melamine polymer hydrophilic modified PVDF composite material is prepared through a hydrothermal reaction and has hydrophilicity. Different from conventional hydrophilic modification, the method has the advantages that in-situ hydrophilic modification is carried out on the PVDF surface through a simple and easily-controlled hydrothermal treatment process, and the hydrophilic performance is improved. The melamine polymer surface functional groups and the spatial network structure are beneficial to loading of metal nanoparticles and providing of catalytic active components. The melamine polymer hydrophilic modified PVDF composite material can be applied to the fields of catalysis, oil-water separation, filtering membranes, coatings and the like, and the product performance is improved.

The invention relates to the technical field of composite current collector materials, and provides a preparation method of a PET-based composite copper foil. The method comprises the following steps: (1) dropwise adding concentrated sulfuric acid into a xylene dispersion liquid of a poly (gamma-benzyl-L-glutamate) nanorod, spraying onto the surface of a PET film, standing for reaction, and performing vacuum drying; (2) spraying an acetic acid solution of hydrobromic acid to the surface of the PET film, standing for reaction, washing and vacuum drying; (3) soaking the PET film in ammonia water, soaking the PET film in a silver nitrate solution, and soaking the PET film in a formaldehyde solution; and (4) chemical copper plating. The method not only can improve the interface bonding between the PET base film and the copper plating layer, but also has good environmental protection property and economical efficiency.

The invention relates to the technical field of oilfield chemistry, and discloses nano-silicon-loaded phenolic resin reinforced jelly as well as a preparation method and application thereof. The method comprises the following steps: (1) mixing phenol and ethylenediamine according to a molar ratio of 1: (0.07-0.1), then adjusting the pH value to 8-10, then carrying out a first reaction on the obtained mixture, silane coupling agent modified silicon dioxide and a dispersion stabilizer at a first temperature, then cooling to a second temperature, and carrying out a second reaction to obtain a reaction solution I; (2) carrying out third reaction on the reaction solution I and a first formaldehyde solution to obtain a reaction solution II; and (3) carrying out fourth reaction on the reaction solution II and a second formaldehyde solution to obtain the nano-silicon loaded phenolic resin cross-linking agent. The nano-silicon-loaded phenolic resin reinforced jelly prepared by the method disclosed by the invention has obviously higher gelling strength and high-temperature-resistant stability.

The invention provides a polyglutamic acid granular fertilizer and a preparation method thereof, and the preparation method comprises the following steps: S1, dissolving lignin in an alkaline solution, and heating until the lignin is dissolved; adding epsilon-polylysine fermentation liquor, mixing, heating, adding a formaldehyde solution, and carrying out grafting reaction to obtain epsilon-polylysine grafted lignin; s2, mixing the epsilon-polylysine grafted lignin solution and the gamma-polyglutamic acid solution, adding N-hydroxysuccinimide, standing at a low temperature, adding 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and mixing; carrying out gradient temperature reaction to obtain lignin grafted epsilon-polylysine / gamma-polyglutamic acid hydrogel; and S3, homogenizing the lignin-grafted epsilon-polylysine / gamma-polyglutamic acid hydrogel, carrying out normal-temperature high-pressure airflow crushing, and spraying the crushed hydrogel to the surfaces of particles obtained by granulating a basic material through high-pressure electrostatic spraying, so as to obtain the polyglutamic acid granular fertilizer. The obtained polyglutamic acid granular fertilizer has relatively strong water-retaining and slow-release (releasing water, urea and the like) effects.

The invention provides a preparation method and device of prothioconazole. The preparation method comprises the following steps: carrying out Grignard reaction on o-chlorobenzyl chloride and magnesium powder in a mixed solvent of toluene and 2-methyltetrahydrofuran; the method comprises the following steps: carrying out Grignard addition reaction on a Grignard reagent and 2-chloro-1-(1-chlorocyclopropyl) ethanone; the preparation method comprises the following steps: carrying out substitution reaction on 1-chloro-2-(1-chlorocyclopropyl)-3-(2-chlorphenyl) propanol and hydrazine hydrate in an alcohol solvent; the preparation method comprises the following steps: carrying out ring closing reaction on 2-(1-chlorocyclopropyl)-1-(2-chlorphenyl)-3-hydrazino-2-alcohol, a formaldehyde solution, a sodium thiocyanate solution and a sodium hydrogen sulfate solution; the preparation method comprises the following steps: carrying out oxidation reaction on 2-(2-chlorocyclopropyl)-3-(2-chlorphenyl)-2-hydroxypropyl)-1, 2, 4-triazolidine-3-thioketone, air and inorganic alkali, so as to obtain prothioconazole. The method can improve the efficiency of the oxidation reaction and the yield and purity of prothioconazole, and is more suitable for industrial production of prothioconazole.

The invention discloses an akabane virus inactivated vaccine preparation method, which comprises: carrying out Vero cell passage in a cell bottle, taking well growing cells until the cells grow to 80-90%, adding into a DMEM culture medium containing 10% of fetal calf serum, taking out the cells growing to 80-90% and having a good state, adding akabane virus CH-JL-01-2022 according to a volume ratio of 0.1%, and carrying out culture at a temperature of 80-90 DEG C so as to obtain the akabane virus inactivated vaccine. Culturing for 2-3 days in an incubator with the temperature of 37 DEG C and 5% CO2; the method comprises the following steps: preparing 0.25 M BEI, 0.1 M BPL and a 40% formaldehyde solution as inactivators, setting five concentration gradients according to the volume ratios of 0.01%, 0.05%, 0.1% and 0.5%, and collecting after 6 hours, 12 hours, 24 hours, 36 hours and 48 hours after adding; the screening of the akabane virus inactivation conditions according to the types, concentrations and inactivation time of inactivators finds that 0.5% formaldehyde shows a complete inactivation effect after inactivation for 36 hours. The inactivated virus liquid is mixed with MONTANIDETM ISA 201, an ImjectI aluminum adjuvant and a manganese adjuvant according to the volume ratio of 1: 1, and then immunization is carried out, and the protection effect of the ImjectI aluminum adjuvant is found to be optimal.

The invention provides a graded porous hard carbon-silicon composite negative electrode material and a preparation method thereof, and belongs to the technical field of new energy battery electrode materials. The preparation method comprises the following steps: mixing pitch-based soft carbon and potassium hydroxide, performing ball milling, performing heating activation in a nitrogen atmosphere, performing cooling, performing washing with hydrochloric acid until the mixture is neutral, and performing vacuum drying to obtain a product A; dispersing the product A in absolute ethyl alcohol, adding polyether diamine and a silane coupling agent (KH560), dropwise adding a triethylamine solution, heating, stirring, performing reflux reaction, and centrifuging and collecting a product B after the reaction is completed; heating and curing the product B in vacuum to obtain a product C; dispersing the product C in water, adding phenol, carrying out ultrasonic dispersion, adjusting the pH value to 8.5-9, then dropwise adding a formaldehyde solution, carrying out a stirring reaction, and after the reaction is finished, carrying out centrifugation and drying to obtain a product D; and carbonizing the product D under the protection of argon to obtain the graded porous hard carbon-silicon composite negative electrode material. According to the graded porous hard carbon-silicon composite negative electrode material, soft carbon and hard carbon are utilized to construct a graded porous structure.

The invention provides a microcapsule type self-early-warning and self-repairing epoxy coating as well as a preparation method and application thereof, and belongs to the technical field of anticorrosive coatings. The method comprises the following steps: mixing urea, resorcinol, ammonium chloride and a polyethylene grafted maleic anhydride aqueous solution, and adjusting the pH value of the mixed solution to obtain a water phase; mixing the PU prepolymer, DCF, TO and ethyl phenylacetate to obtain an oil phase; the water phase and the oil phase are mixed, a formaldehyde solution is added into the mixed solution for a reaction, and microcapsules are obtained; and adding the microcapsule into the epoxy coating to obtain the microcapsule type self-early-warning and self-repairing epoxy coating. According to the microcapsule, PU / UF serves as a shell of DCF and TO, DCF serves as an early warning agent, and TO serves as a repairing agent; the DT coated PU / UF microcapsule has good dispersibility in the coating, when the coating is damaged, the microcapsule is broken to release DCF and TO, the self-early warning and self-repairing performance of the coating is achieved, and metal corrosion is delayed.

The invention belongs to the technical field of drug synthesis, and relates to a dotenorad synthesis method, which comprises: weighing 100 g of a compound 1 as a raw material, and carrying out a substitution reaction with dimethyl sulfate to obtain a compound 2; taking the compound 2 as a raw material, and carrying out esterification reaction with methanol under an acidic condition; taking the compound 3 as a raw material, and obtaining a compound 4 after chlorination; hydrolyzing the compound 4 serving as a raw material to obtain a compound A; reacting the compound 5 serving as a raw material with a formaldehyde aqueous solution to obtain a compound 6; taking the compound 6 as a raw material, and performing thioether oxidation to obtain a compound B; taking a compound A as a raw material, and carrying out amide condensation reaction with a compound B to obtain a compound C; and 6, demethylating the compound C serving as a raw material under the action of lithium chloride to obtain a compound D, namely the final product dotenorad. According to the synthesis method of dotenorad, oxidation after condensation is not needed, generation of by-products is avoided, raw materials are low in cost and easy to obtain, and the synthesis method is suitable for industrial production.

The invention discloses weather-resistant white latex applied to wooden box bonding and a preparation method thereof, and the weather-resistant white latex is prepared from the following raw materials: 1 to 5 parts of polyvinyl alcohol, 20 to 45 parts of deionized water, 0.1 to 0.4 part of magnesium strengthening powder, 0.6 to 1 part of formaldehyde solution, 6 to 9.6 parts of styrene-acrylic emulsion, 0.6 to 0.96 part of hydroxypropyl methyl cellulose, 2 to 5 parts of nano silicon dioxide, 30 to 45 parts of vinyl acetate, 2 to 6 parts of acrylic acid, 2 to 6 parts of butyl acrylate and 2 to 6 parts of methyl methacrylate. The biomass fiber material comprises the following components in parts by weight: 3-6 parts of dibutyl phthalate, 0.5-2.5 parts of an emulsifier, 0.1-0.5 part of an initiator and 2-5 parts of a biomass fiber material. The white latex prepared according to the scheme provided by the invention has relatively strong weather resistance, and the white latex at the bonding part does not crack when a wooden box bonded by the white latex is placed for a period of time under the conditions of 60 DEG C, 96% humidity, 60 DEG C, 10% humidity and-20 DEG C.

The invention discloses a preparation method and fertilizer of a liquid fertilizer containing polyphosphate stability and synergistic effect, wherein liquid phosphoric acid and urea are subjected to polymerization reaction to generate polyphosphate urea liquid, the polyphosphate urea liquid is then subjected to secondary polymerization with ammonia water to prepare a first mixed solution of ammonium polyphosphate, ammonium phosphate and polyphosphate urea, the pH value is adjusted to 6.5-7.5, and the mixture is fully stirred, mixed and packaged to obtain a finished product. After the first mixed solution is generated and before the pH value is adjusted, sulfonated straw powder after fermentation is added to the first mixed solution, SO3 is introduced and formaldehyde solution is added dropwise to generate phosphorylated lignin, a chelate reaction is carried out at room temperature to form a second mixed solution containing chelated lignin and amino acids, and a suspending agent is added. The purpose of the invention is to reduce production costs, improve the water solubility of phosphorus, enrich the nutrient content of liquid fertilizer, make it unnecessary to add other fertilizers during the application process of liquid fertilizer, and further achieve weight loss and synergistic effect.

The invention discloses a preparation method and application of a resin-based hard carbon composite material, the preparation method comprises the following steps: melting phenol, adding a formaldehyde solution, adding carbon nanotube powder, and adjusting the pH value to 8-10 by using triethylamine to prepare a phenolic resin precursor solution; carrying out cross-linking curing reaction on the phenolic resin precursor solution to obtain a phenolic resin cured precursor; and mechanically grinding the phenolic resin curing precursor, and putting the phenolic resin curing precursor into a tubular furnace to finally prepare the resin-based hard carbon composite material with the conductivity of more than 30S / cm. Conductive carbon is introduced to the condensation polymerization end of phenol and formaldehyde, a communicated conductive network is formed in the composite material by regulating and controlling the material composition, the electron transmission distance between particles is shortened, the intrinsic conductivity of original resin carbon is improved, and the composite material has the advantages of high capacity, high first efficiency, high magnification and low ash content; wide application prospects are realized in the field of lithium ion battery negative electrode materials.

The invention belongs to the technical field of biomedicine, and particularly relates to a preparation method of a cell paraffin embedding sample. The method comprises the following steps: S1, immobilizing a cell sample with a formaldehyde solution, centrifuging, discarding a supernatant, and resuspending cells to obtain a cell suspension; s2, preparing an agarose solution, cooling to 50-65 DEG C, mixing the agarose solution with the cell suspension, and cooling and solidifying to form agarose blocks; and S3, dehydrating, transparentizing and soaking the agarose blocks, and then carrying out paraffin embedding, low-temperature solidification and slicing to obtain the paraffin-embedded cell sample. According to the method, parameters in the processes of fixing, transparentizing, embedding treatment and the like are specifically designed and optimized, all the parameters are matched with one another, the cell morphology, the structural integrity and the subsequent dyeing effect can be effectively ensured, and the uniformity of the cell slices can reach 95% or above; the problem that in a traditional method, the difference of negative and positive results of single slices at different positions of a wax block is large is solved.

The invention relates to the technical field of virus antigens, and particularly discloses an inactivation method for improving the recovery rate of enterovirus antigens. The method disclosed by the invention specifically comprises the following steps: adding a protective agent with the final concentration of 50-250 [mu] g / ml into purified enterovirus liquid; after fully and uniformly mixing, stirring and incubating the mixed solution; the protective agent is prepared by mixing TritionX-100, arginine and lysine; the incubation temperature is 25-40 DEG C, and the incubation time is 4-12 hours; then adding a formaldehyde solution until the final concentration is 180-220 mu g / ml, and inactivating for 68-76 hours under the condition that the temperature is 35-39 DEG C, so as to obtain an inactivated vaccine; and finally, washing and filtering the inactivated solution to remove TritionX-100 and formaldehyde in the sample. According to the technical scheme, the recovery rate of the antigen in the inactivation solution is greatly improved, and the residual quantity of TritionX-100 and formaldehyde is small.