322 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 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 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 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 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 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 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 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 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.

The invention relates to a water-soluble ultraviolet absorbent 4-disubstituted aminobenzyl subunit camphorsulfonic acid and a synthesis method and application thereof, and the synthesis method comprises the following steps: in a toluene-methanol mixed solvent, carrying out heating reflux reaction on camphorsulfonic acid and 2 equivalent weight of sodium methoxide, and after enolation conversion is completed, carrying out reduced pressure distillation to obtain the 4-disubstituted aminobenzyl subunit camphorsulfonic acid. Slowly dropwise adding a corresponding 4-disubstituted aminobenzaldehyde solution with the molar weight equal to that of camphorsulfonic acid, continuously heating and stirring to react for 6-12 hours, adding water to terminate the reaction, acidifying the reaction solution by using hydrochloric acid or sulfonic acid type cation exchange resin, separating to remove methylbenzene, adjusting the pH value of a water phase to about 6.5, performing rotary evaporation dehydration under reduced pressure, and extracting a crude product by using a conventional method; a target product can be obtained through column chromatography purification, and the target product not only has water solubility, but also has the characteristic of absorbing UVA and UVB ultraviolet light at the same time; the composition can be applied to sun-screening agent products, cosmetics or home care products, and also can be applied to various industrial products such as paint, varnish, plastics, textiles and rubber to improve the light resistance of the industrial products.

The present invention relates to a preparation method of beta-methylenepyridine-2-ethanol. The preparation method of beta-methylenepyridine-2-ethanol uses 2-picoline as a first raw material, formaldehyde solution or paraformaldehyde as a second raw material, and urotropine as a catalyst, and reacts according to the following steps: (1) the first raw material, the second raw material, the catalyst and water are mixed and placed in an autoclave, the temperature is raised to 140-160° C., and after reacting for 18-20 hours, a solution containing beta-methylenepyridine-2-ethanol is obtained; (2) the solution containing beta-methylenepyridine-2-ethanol is distilled to obtain a product. The present application uses urotropine as a catalyst, utilizes its unique spatial structure and charge distribution, improves the selectivity of the reaction, and the reaction process is solvent-friendly, the steps are simple, and beta-methylenepyridine-2-ethanol can be obtained by a one-pot method, which is suitable for industrialization.

A preparation method for a urea-formaldehyde microcapsule, comprising: uniformly mixing an emulsifier, urea, ammonium chloride, resorcinol and deionized water, adjusting the pH value, defoaming, adding dicyclopentadiene to form an emulsion, after stabilization, adding a formaldehyde solution and paraffin oil, covering and heating the emulsion for polymerization, and cooling and washing to obtain a urea-formaldehyde microcapsule.

The invention relates to the technical field of preparation of phase change materials, and discloses a preparation method of a high-stability double-framework composite phase change material. The preparation method comprises the following steps: firstly, dissolving resorcinol in deionized water, adding hexadecyl trimethyl ammonium bromide, stirring and dissolving, then adding a formaldehyde solution, fully mixing, and reacting in a drying oven to prepare phenolic resin; then, carrying out high-temperature carbonization on phenolic resin in a tubular furnace to obtain phenolic resin carbide with a porous structure; then, enabling the carbonized phenolic resin to adsorb phase-change materials such as paraffin in a molten state through a vacuum impregnation method, and after adsorption is completed, crushing the carbonized phenolic resin into fine powder; and finally, mixing the powder with high-molecular polymers such as epoxy resin, and performing curing reaction to form a double-framework composite structure. According to the invention, a double-support system is constructed through the synergistic effect of a phenolic resin carbide skeleton and a high-molecular polymer skeleton, so that the thermal stability and the shape retention capability of the phase-change material are remarkably improved, and the problems that a traditional phase-change material is easy to leak and poor in cycle performance are effectively solved. The obtained composite phase change material has important application value in the heat energy storage fields of building energy saving, waste heat recovery and the like.

The invention belongs to the technical field of synthesis of extraction agents, and particularly relates to a preparation method and application of amido diphosphinic acid. The preparation method comprises the following steps: (1) mixing a solvent, primary amine, cyclohexylphosphinic acid and inorganic acid, and heating until the solution is clear and transparent; (2) adding a formaldehyde solution or paraformaldehyde into the clear and transparent solution for reaction; and (3) removing a water phase from the mixture obtained after the reaction in the step (2) is finished, dissolving jelly obtained after the water phase is removed by using dichloromethane, and carrying out washing, rotary evaporation and drying to obtain the amido diphosphinic acid.

The invention discloses a lignin-based composite condensation water pipeline corrosion inhibition agent as well as a preparation method and application thereof. The lignin-based composite condensation water pipeline corrosion inhibition agent is prepared from the following raw materials: alkali lignin, a formaldehyde solution, an amine monomer, sodium molybdate and ethanolamine ascorbic acid. The preparation method comprises the following steps: dissolving alkali lignin in a solvent, adding a formaldehyde solution, sufficiently and uniformly mixing, slowly dropwise adding an amine monomer, carrying out Mannich reaction on the alkali lignin and the amine monomer at a certain temperature to obtain aminated lignin, and then cooling; after cooling is completed, sodium molybdate, ethanolamine and ascorbic acid are added into a system, continuous stirring is conducted, an obtained reaction solution is dried, and the lignin-based composite condensation water pipeline corrosion inhibition agent is prepared. The lignin-based composite corrosion inhibition agent for the condensed water pipeline is applied to be added into the condensed water pipeline to regulate and control the quality of condensed water, and a passive film is generated on the inner wall of the condensed water pipeline, so that the corrosion prevention of the condensed water pipeline is realized.

The invention belongs to the field of polymer adhesive materials, and particularly relates to a naringenin modified lignin phenolic resin adhesive and a preparation method thereof. The naringenin modified lignin phenolic resin adhesive is prepared from the following raw materials in parts by mass: 60 to 70 parts of formaldehyde solution, 65 to 85 parts of phenol, 6 to 14 parts of naringenin, 10 to 20 parts of lignin, 12 to 18 parts of alkali metal hydroxide and 25 to 30 parts of water. The mass concentration of the formaldehyde solution is 35%-40%. The phenolic resin adhesive is prepared by taking the biological phenol naringenin and the lignin as raw materials to replace part of phenol, so that the aim of environmental protection is fulfilled by replacing non-renewable resources with renewable resources, the bonding strength and the thermal performance of phenolic resin are improved, and the application field of the biological phenolic resin adhesive is widened.

Free radical scavengers may be useful as stabilizers for aqueous formaldehyde solutions. For example, an aqueous formaldehyde solution may include 40 wt % or greater of water, 30 wt % or greater of formaldehyde, and 250 ppm or less of a free radical scavenger, each concentration based on a total weight of the aqueous formaldehyde solution.

The invention discloses a production method of methylene disalicylic acid, which belongs to the technical field of chemical synthesis, and comprises the following steps: S1, adding a certain amount of water into a reaction container, adding salicylic acid solid, uniformly stirring and pulping for half an hour; s2, slowly adding strong acid into the reaction container at a constant speed, and uniformly stirring for half an hour; s3, slowly adding a formaldehyde solution into the reaction container at a constant speed, and uniformly stirring; and S4, slowly heating the mixture in the reaction container to 93-96 DEG C, keeping the temperature, standing, extracting supernate, washing with water, and centrifuging to obtain the target product methylene disalicylic acid. The invention solves the problems that the cost of the existing glacial acetic acid is high, the glacial acetic acid is easy to crystallize and volatilize in winter, the environmental pollution is easy to cause, and the occupational health of operators is harmed. The methylene disalicylic acid is produced by using the concentrated sulfuric acid and the formaldehyde solution instead of the conventional acetic acid process, so that the cost is obviously reduced, the safety is high, and the method is suitable for industrial mass production.

The invention belongs to the technical field of magnesium ion batteries, and particularly relates to an in-situ synthesized aqueous magnesium ion battery organic composite negative electrode material, a preparation method and a negative electrode. The negative electrode material provided by the invention is a negative electrode material PDBM (at) KB obtained by introducing a formaldehyde solution into a suspension liquid of 2, 5-dihydroxy-1, 4-benzoquinone and conductive carbon which are uniformly mixed, carrying out quinone-aldehyde condensation polymerization under the catalysis of glacial acetic acid and carrying out in-situ synthesis; meanwhile, the distribution of KB in the negative electrode material PDBM (at) KB is further improved through the technological means of ultrasonic dispersion, vacuum infiltration and the like, a rapid ion transmission channel is constructed, the utilization rate of PDBM active substances is remarkably increased, and the aqueous magnesium ion battery with the PDBM / KB as the negative electrode shows high capacity, long circulation, high rate performance and high power performance; therefore, the technical problem that an existing magnesium ion battery electrode material is low in performance is solved.

The invention relates to the field of cooling devices, in particular to a cooling device for formaldehyde solution production, which comprises a cooling component and a closed cooling tower main body, a plurality of coil pipes are fixedly connected in the closed cooling tower main body through a support plate, and the right ends of the plurality of coil pipes are connected with a water storage box; the cleaning component comprises a first arc-shaped ring arranged outside the coil pipe, a second arc-shaped ring is arranged on the first arc-shaped ring through a storage part, cleaning parts used for cleaning the coil pipe are arranged on the first arc-shaped ring and the second arc-shaped ring correspondingly, and a power part used for providing power for movement of the first arc-shaped ring is arranged on the inner wall of the closed cooling tower body. A shielding part is arranged on the outer side of the power part to prevent water from entering the power part; and the transposition component comprises a cylinder which is arranged on the first arc-shaped ring and is provided with two open ends. According to the device, the coil pipe can be automatically and rapidly washed, manual operation is not needed, manpower is saved, the washing efficiency is improved, and the cooling effect of the closed cooling tower is guaranteed.