484 results about "Aminobenzoic acid" patented technology

The invention relates to a polyorganosilicone cyclophosphazene modified epoxy resin and a preparation method thereof, and belongs to the field of flame retardant materials, and the preparation method of the polyorganosilicone cyclophosphazene flame retardant comprises the following steps: taking hexachlorotripolyphosphazene, p-hydroxybenzaldehyde, p-aminobenzoic acid, DOPO and diphenyl silanediol as raw materials, and carrying out four-step reaction to prepare the polyorganosilicone cyclophosphazene modified epoxy resin. The preparation method comprises the following steps: by taking m-phenylenediamine as a curing agent, adding the series gradient polyorganosilicone cyclophosphazene flame retardant into the epoxy resin, and curing twice to obtain the modified epoxy resin. The preparation method is mainly used for preparing the polyorganosilicone cyclophosphazene flame retardant and the polyorganosilicone cyclophosphazene modified epoxy resin.

The invention belongs to the field of health-care tea preparation, and particularly relates to begonia flower and leaf tea and a preparation method thereof. Triticale bran pulp is mixed with smashed begonia leaves, the mixture is fermented through a flavor improving fermentation inoculant and then mixed with an anti-oxidation and excitation-inhibiting solution, and the prepared low-caffeine tea base material does not cause insomnia, has the characteristics of inhibiting inflammation and resisting oxidation, protects nerve cells from being damaged, and is suitable for being used as a health-care tea base material. The honeysuckle, the endive and the soybeans are ground into thick liquid, then mixed with the repair juice, centrifuged to remove precipitates, and then frozen nano spray drying is carried out, so that the obtained nano particles for protecting the liver and the kidney and promoting circulation are higher in stability and can accelerate absorption of small intestines; a taste regulator obtained by mixing grain mucus with tartaric acid, ethyl maltol, methyl anthranilate and sorbic acid is sprayed on the surface of a begonia flower and leaf tea mixture, and the prepared begonia flower and leaf tea does not affect sleep after being drunk, does not damage livers and kidneys in organisms, is good in taste and is easy to drink for a long time.

The invention discloses a fermentation medium for regulating and controlling a clostridium aerovorans target product and a fermentation method of the clostridium aerovorans target product. The medium comprises a basic component and a regulating component, the basic components comprise ammonium chloride, potassium chloride, magnesium sulfate heptahydrate, sodium chloride, monopotassium phosphate, yeast powder, calcium chloride dihydrate, sodium selenite, nickel chloride hexahydrate, biotin, folic acid, pyridoxine hydrochloride, thiamine, riboflavin, nicotinic acid, D-calcium pantothenate, cobalamin, para aminobenzoic acid and lipoic acid; the adjusting component comprises sodium tungstate, ferrous sulfate and sodium molybdate, sodium tungstate and ferrous sulfate have a forward adjusting effect on increasing the yield of acetic acid, ethanol and butanol in the target product, and sodium molybdate has a reverse adjusting effect on the target product. By optimizing the proportion of trace elements in the culture medium, the clostridium metabolism efficiency is improved, synthesis of a target product is regulated and controlled, and the method is particularly suitable for industrial production of acetic acid, ethanol, butanol and the like.

The invention discloses an all-solid-state composite dry conductive agent and a preparation method thereof, and belongs to the technical field of batteries. The all-solid-state composite dry conductive agent is prepared by the following steps: uniformly mixing carbon nanotubes, high-dispersion carbon black and graphene to obtain a primary mixture; then preparing a uniformly dispersed glue solution from the composite dispersant and water; and then adding the primary mixture into the glue solution, uniformly mixing, sanding, homogenizing, drying and crushing to obtain the product, the high-dispersion carbon black is obtained by oxidizing carbon black to form active groups such as carboxyl and hydroxyl on the surface of the carbon black, halogenating acyl and then reacting with lithium 2, 5-diaminobenzene sulfonate. The preparation method comprises the following steps: grafting histidine ester into carboxymethyl cellulose by using propylene glycol diglycidyl ester as a cross-linking agent, then introducing allyl-1, 3-sultone, then copolymerizing with lithium 2-acrylamido-2-methylpropanesulfonate and 3-aminobenzoic acid allyl ester protected by fluorenylmethoxycarbonyl, and then deprotecting to obtain the composite dispersant.

The invention discloses a method for producing docosahexaenoic acid by strengthening schizochytrium limacinum, which comprises the following steps: carrying out fermentation culture on a schizochytrium limacinum strain until the growth period is ended (a nitrogen source is used up); when the growth period of the schizochytrium limacinum is ended, exogenously adding hydrogen peroxide, culturing, exogenously adding para aminobenzoic acid, and culturing; and repeating for several times, and ending the fermentation to obtain the DHA-containing fermentation liquor. Compared with execution of a blank group without addition of exogenous additives, an independent hydrogen peroxide intermittent feeding control strategy and an independent aminobenzoic acid intermittent feeding control strategy, the DHA yield is increased by 25.21% or above when the hydrogen peroxide-p-aminobenzoic acid periodic control method is adopted, and the highest level of 1.49 g / L is achieved.

The invention discloses a heat dissipation type anti-corrosion coating and a preparation method thereof, and belongs to the technical field of anti-corrosion coatings. The heat dissipation type anticorrosive paint comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 100 parts of heat-conducting water-borne epoxy resin, 4-6 parts of graphene, 0.3-0.5 part of an antioxidant, 0.2-0.4 part of a defoaming agent, 0.2-0.4 part of a flatting agent and 10 parts of first deionized water; the component B comprises the following components in parts by mass: 10-20 parts of a curing agent, 40-60 parts of a toughening agent, 4-6 parts of functionalized boron nitride microspheres and 30-50 parts of second deionized water; the heat-conducting water-borne epoxy resin is 1, 5-naphthalene diphenol modified water-borne epoxy resin; the curing agent is an aromatic amine curing agent; the toughening agent is obtained by carrying out copolymerization on acrylamide, N-(4-aminophenyl) acrylamide, 1, 3, 5-triacryloyl-s-triazine and 3-dimethylamino allyl phosphoric acid; the functionalized boron nitride microspheres are boron nitride microspheres modified by 4-aminobenzoic acid.

The invention discloses an impact-resistant industrial coating and a manufacturing method thereof, and relates to the technical field of industrial coatings. The impact-resistant industrial coating comprises the following raw materials in parts by weight: 80-100 parts of epoxy resin, 2-5 parts of graphene oxide, 3-5 parts of an antistatic agent, 5-8 parts of a modified thickener, 1-3 parts of a dispersant, 0.5-1.5 parts of a leveling agent, 2-3 parts of an antioxidant, 8-12 parts of a curing agent and 100-140 parts of deionized water. The preparation method comprises the following steps: reacting polyethylene glycol diethylene oxide methyl ether with 2-(methacrylic acid) ethyl ester 3, 5-diaminobenzoic acid to generate a polymer; reacting the polymer with 3-(dimethylamino)-1-propanethiol to generate a tertiary amine-terminated polymer; and carrying out quaternization reaction on the tertiary amine-terminated polymer and bromododecane to obtain the antistatic agent. The impact-resistant industrial coating prepared by the invention has excellent antistatic property and rheological property.

The invention discloses a terpolymer scale inhibitor and a preparation method thereof, and belongs to the technical field of polymer macromolecules and water treatment. The terpolymer scale inhibitor has the following structural general formula: # imgabs0 #, and in the formula, x, y and n are respectively any integer from 1 to 10. In addition, the invention also provides a preparation method of the terpolymer scale inhibitor, which comprises the following steps: mixing aconitic acid and water, stirring and dissolving at 50-55 DEG C, adding N, N-dimethylacrylamide and para aminobenzoic acid, heating to 65-85 DEG C, dropwise adding an initiator, and reacting at 65-90 DEG C to obtain the terpolymer scale inhibitor. The scale inhibitor provided by the invention is green and environment-friendly, and has excellent scale inhibition performance.

The invention discloses a catalyst and method for preparing 3-methyl-2-aminobenzoic acid through continuous catalytic hydrogenation, and the method comprises the following steps: pretreating an activated carbon carrier by using pretreatment reagents such as nitric acid and hydrogen peroxide to remove impurities in the carrier; modifying the carrier by using an auxiliary component 1 such as sodium carbonate, stannic chloride, potassium carbonate and lanthanum nitrate, and then roasting and reaming; and finally, active components such as platinum chloride and palladium chloride are mixed and impregnated with an auxiliary component 2 such as oxalic acid, polyethylene glycol-400, sodium metavanadate and polyvinylpyrrolidone, the auxiliary component 2 promotes dispersion of the active metal, and the auxiliary component 2 and the auxiliary component 1 have a synergistic effect, so that the active metal is loaded more uniformly and firmly, and the obtained catalyst has higher activity and selectivity and longer service life. The catalyst is applied to preparation of 3-methyl-2-aminobenzoic acid through catalytic hydrogenation in a fixed bed reactor, the reaction can be continuously and automatically controlled, the three wastes in the reaction process are few, the yield of a target product is high, the service life of the catalyst is long, and the catalyst is suitable for industrial production.

The invention discloses an insulating ceramic material, a preparation method thereof and application of the insulating ceramic material in a semiconductor heater. The insulating ceramic material comprises the following raw materials in parts by weight: 70-80 parts of aluminum oxide, 20-30 parts of boron nitride, 1-2 parts of magnesium oxide, 2-3 parts of quartz fiber powder and 4-6 parts of a modifier, the preparation method of the modifier comprises the following steps: reacting sodium alginate with 3, 3 '-dithiobis (4-aminobenzoic acid) to generate a first intermediate, reacting the first intermediate with polyacrylic acid to generate a second intermediate, and generating the modifier from the second intermediate under the action of aluminum chloride. The insulating ceramic material disclosed by the invention has excellent mechanical property, heat-conducting property and insulating property, and can remarkably improve the working performance of the semiconductor heater and prolong the service life of the semiconductor heater when being applied to the semiconductor heater.

The invention discloses organosilicone cyclophosphazene modified epoxy resin and a preparation method thereof, belongs to the field of flame-retardant materials, and particularly relates to a preparation method of an organosilicone cyclophosphazene flame retardant and a preparation method of the organosilicone cyclophosphazene modified epoxy resin. The invention aims to research and develop a synergistic composite flame retardant of three elements of N, P and Si by optimizing the structure of the flame retardant and solve the problem of low flame retardant efficiency of the flame retardant. The preparation method comprises the following steps: taking hexachlorotripolyphosphazene, p-hydroxybenzaldehyde, p-aminobenzoic acid, DOPO and triphenylsilanol as raw materials, and carrying out substitution, dehydration condensation, addition and esterification to obtain the organic silicon cyclophosphazene flame retardant. The modified epoxy resin is obtained by taking m-phenylenediamine as a curing agent and adding organosilicone cyclophosphazene flame retardants in different proportions. The organosilicone cyclophosphazene modified epoxy resin provided by the invention reaches the standard of a flame-retardant material, and the limit oxygen index is up to 31.6%, which passes a UL-94 test.

The invention belongs to the technical field of membrane separation, and particularly relates to a low-pressure high-flux polyamide / polysulfone hollow fiber composite nanofiltration membrane and a preparation method thereof. The preparation method of the composite nanofiltration membrane comprises the following steps: dissolving sulfonated polysulfone, poly (1-vinyl-3-butylimidazole) bromide and polyvinylpyrrolidone to prepare a spinning solution, and spinning to obtain a base membrane; carrying out hydrophilic modification on the base membrane by using 1, 3-propane sultone; then, an aqueous phase solution containing poly (gamma-glutamic acid) and triethylene tetramine and an organic phase solution containing trimesoyl chloride and 3, 5-diaminobenzoic acid are subjected to interfacial polymerization in the inner cavity of the modified base membrane to form a polyamide separation layer; and finally, carrying out heat treatment to obtain the composite nanofiltration membrane. Through the synergistic effect of zwitterionic ionization of the base membrane and biomacromolecule construction of the separation layer, the mass transfer resistance of water is remarkably reduced, unification of high flux and high selectivity is achieved, and good structural stability is achieved.

The invention relates to the technical field of electrochemical analysis and detection, in particular to a preparation method of a nano composite material containing manganese-zirconium-based MOFs confinement zero-valent iron and a construction method for constructing an electrochemical sensor by using the nano composite material. A preparation method of a nano composite material containing manganese-zirconium-based MOFs confinement zero-valent iron comprises the following steps: dissolving a PCN-222 (Mn) precursor in DMF for ultrasonic treatment, stirring and heating a suspension I after ultrasonic treatment, adding Fe (NO3) 2 and p-aminobenzoic acid, continuously stirring, filtering and drying, then transferring into ethylene glycol, dropwise adding NaBH4 for reaction, filtering, washing, and drying to obtain the nano composite material containing manganese-zirconium-based MOFs confinement zero-valent iron. A third suspension is obtained. And centrifuging the suspension III to obtain a solid II, washing the solid II with an acetone solution, and drying. The prepared manganese-zirconium-based MOFs confinement zero-valent iron nano material can be used for modifying an electrode and constructing an electrochemical sensor, and the constructed electrochemical sensor can effectively detect trace Hg < 2 + > in a water environment, and has high sensitivity and good stability on Hg < 2 + > electrochemical detection.

The invention relates to the technical field of epoxy resin, and discloses a polyarylamide modified boron nitride-epoxy resin composite material, hydroxylated nano boron nitride reacts with a diazo group of 4-diazo diphenylamine sulfate to obtain aminated nano boron nitride, the aminated nano boron nitride and a 3, 5-diaminobenzoic acid monomer are subjected to a polymerization reaction to obtain polyarylamide modified boron nitride, and the polyarylamide modified boron nitride-epoxy resin composite material is prepared through the following steps: reacting hydroxylated nano boron nitride with a diazo group of 4-diazo diphenylamine sulfate; the polyarylamide modified boron nitride has good compatibility with epoxy resin, amino-terminated groups can be subjected to ring-opening reaction with epoxy groups of the epoxy resin, nano boron nitride is organically combined with the epoxy resin under the bridging action of polyarylamide, covalent bonds formed between a large number of amino groups on the surface and the epoxy resin in the curing process, and the epoxy resin can be cured to form the epoxy resin. The interface thermal resistance of the filler and the epoxy resin is reduced, the superhigh resistivity of the nano boron nitride, the reduction of agglomeration and the modification of the filler enable the polyarylamide modified boron nitride-epoxy resin composite material to show excellent thermal conductivity.

The preparation method comprises the following steps: taking para aminobenzoic acid, 3, 3-diaminobiphenyl and phosphorus pentoxide as raw materials, and carrying out high-temperature dehydration cyclization reaction in a polyphosphoric acid solvent to obtain a diamine monomer containing biimidazole; the preparation method comprises the following steps: adding a bis-imidazole-containing diamine monomer, 2-(4-aminophenyl)-5-aminobenzoxazole and an organic solvent into a reactor, stirring and dissolving, after the solution is clarified, adding pyromellitic dianhydride, stirring and reacting, and after the reaction is completed, obtaining a polyamide acid membrane casting solution; and carrying out film casting on the polyamide acid film casting solution, drying at low temperature, and transferring to a muffle furnace to carry out imidization reaction after solvent volatilization is finished, so as to obtain the bis-imidazole polyimide film. The biimidazole polyimide film constructed by the invention is applied to a flexible OLED substrate, and has relatively good thermal performance and mechanical performance.

The invention relates to the technical field of high polymer materials, and discloses a high-strength anti-aging PE film, and a preparation method and application thereof. The preparation method of the high-strength anti-aging PE film comprises the following steps: modifying POSS-SH to obtain modified POSS; and combining the product obtained by the reaction of the 3, 5-di-tert-butyl-2-hydroxybenzaldehyde and the p-phenylenediamine with the modified POSS to obtain the high-performance antioxidant. 3, 5-diaminobenzoic acid is grafted on the surface modified calcium sulfate whiskers, and then nano calcium fluoride is deposited to obtain an inorganic composite material; treating the inorganic composite material to obtain an amphiphilic modified inorganic composite material; and mixing the amphiphilic modified inorganic composite material, a high-performance antioxidant and modified polyethylene, carrying out melt blending, and carrying out film blowing to obtain the high-strength anti-aging PE film. The high-strength aging-resistant PE film has good mechanical properties, thermal aging resistance, transparency and skid resistance, and can be used as an inner film material of an ultraviolet-cured hose material.

The invention belongs to the technical field of cosmetics, and particularly relates to fog-feeling smoothie-texture sunscreen cream and a preparation method thereof. The fog-feeling smoothie texture sunscreen cream is prepared from the following components in percentage by weight: 12 to 30 percent of a sunscreen agent, 10 to 30 percent of an emollient, 5 to 20 percent of a humectant, 3 to 6 percent of an emulsifier, 0.3 to 2 percent of a skin conditioner, 1 to 3 percent of a thickening agent, 0.3 to 0.8 percent of an antioxidant, 0.03 to 0.06 percent of a chelating agent, 0.01 to 0.05 percent of essence and the balance of water, the sunscreen agent is a combination of polysiloxane 15, diethylamino hydroxybenzoyl hexyl benzoate, bis (2-ethylhexyloxy) phenol methoxyphenyl triazine and ethylhexyl triazinone. Through the synergistic effect of specific sun-screening agent components, better sun-screening performance and sun-screening stability are achieved. And through a specific emulsifying and thickening system, the product is endowed with foggy smoothie texture, is fresh and non-sticky, and is hidden and glossy. Meanwhile, the composition is very mild to various skin types.

The invention relates to the technical field of conductive heating materials, and discloses a carrier for improving the conductive heating performance of carbon nanotubes and a preparation method thereof.The carrier comprises a base material layer, a modified nanometer aluminum oxide / water-soluble polymer resin carrier layer and a carbon nanotube layer; the modified nano aluminum oxide / water-soluble polymer resin carrier layer comprises modified aluminum oxide; one or more modified groups of gamma-aminopropyltriethoxysilane, gamma-glycidyl ether oxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, ammonium polyacrylate, sodium vinyl sulfonate, aminobenzoic acid and diallyldimethylammonium chloride are grafted on the surface of the modified aluminum oxide, and one or more modified groups of the gamma-aminopropyltriethoxysilane, the gamma-glycidyl ether oxypropyltrimethoxysilane, the gamma-methacryloxypropyltrimethoxysilane, the ammonium polyacrylate, the sodium vinyl sulfonate, the aminobenzoic acid and the diallyldimethylammonium chloride are grafted on the surface of the modified aluminum oxide. The modified nano aluminum oxide / water-soluble polymer resin carrier layer further comprises a dispersing agent; the dispersing agent is adsorbed into the modified aluminum oxide. The material obtained in the invention has good conductive heating capability.

The invention relates to a developing embolism microsphere as well as a preparation method and application thereof, and belongs to the technical field of embolism microspheres. The developing embolism microsphere comprises a polymer network structure formed by cross-linking polymerization of an iodine-substituted aminobenzoic acid monomer and a glycidyl ether cross-linking agent with an epoxypropane end group. The developing embolism microsphere provided by the invention has good X-ray developing capability, relatively low density, excellent suspension performance and moderate hardness and elasticity, and can be effectively applied to preparation of tumor radiotherapy, chemotherapy and embolism combined treatment medicines and developing diagnostic reagents.

The application relates to the technical field of building materials, and discloses a permeable crystalline self-healing waterproof material for concrete self-waterproofing, which is prepared from the following raw materials in parts by weight: 20-30 parts of sodium-based bentonite, 20-50 parts of sodium methyl silicate, 4-6 parts of a penetrating agent, 8-12 parts of a sulphoaluminate cement, 15-18 parts of a silicone zirconium, and 2-5 parts of a complexing agent; the complexing agent is composed of 2-[3-(4-pentylphenyl)prop-2-enylamino]benzoic acid and sodium ethylenediaminetetraacetate. The above technical scheme solves the problem of low mechanical performance and waterproofness of concrete in the prior art.

The invention provides an essence with a jasmine tea flavor. Comprising leaf alcohol, linalool, phenethyl alcohol, alpha-amyl cinnamic aldehyde, hexanal, benzyl acetate, jasmine absolute oil, neroli oil, leaf alcohol acetate, indole, geraniol, geranyl acetate, linalyl acetate, methyl dihydrojasmonate, farnerol, alpha terpilenol, damascenone B, ionone B, benzyl acetate, benzyl alcohol, leaf alcohol benzoate and ethyl maltol. The compound is one or more of methyl anthranilate, methyl benzoate and methyl salicylate. The jasmine tea beverage food added with the jasmine tea flavor essence disclosed by the invention can effectively modify and improve the flavor of the jasmine tea beverage, increase the tea fragrance and flower fragrance of the jasmine tea beverage, and enable the fragrance and taste to be richer and fuller.

The present invention relates to the technical field of nylon 6 flame retardancy, and specifically to a carbon-based composite flame retardant and flame-retardant nylon 6 prepared by in-situ polymerization. The preparation raw materials thereof at least include: amino-functionalized metal oxide modified carbon nanotubes, compounds containing triazine-based flame retardant groups, p-hydroxybenzaldehyde, and p-aminobenzoic acid. The preparation raw materials of the amino-functionalized metal oxide modified carbon nanotubes at least include an acidified and opened carbon nanotube solution, an alcohol solution of a metal salt, and an amino silane solution. Using carbon nanotubes as the main flame retardant, a composite flame retardant is constructed with other flame retardant components by chemical methods, and an in-situ polymerization method is used to develop a nylon 6 material with comprehensive flame retardancy and difficult spreadability, reducing the risk of fire generation and spread, and having extremely high market application and promotion value.

The invention relates to an interface passivation layer, a perovskite solar cell, a preparation method of the perovskite solar cell and an electrical device. The perovskite solar cell comprises a transparent conductive layer, a hole transport layer, a perovskite absorption layer, an interface passivation layer, an electron transport layer and an electrode which are stacked. And the interface passivation layer comprises 3-fluoro-4-aminobenzoic acid. According to the invention, polyfunctional 3-fluoro-4-aminobenzoic acid is adopted as the interface passivation layer, so that the effect of fine passivation on the surface of the perovskite solar cell is realized, the 3-fluoro-4-aminobenzoic acid interface passivation layer can chemically react with atoms or molecules at the interface defects, the defects are filled, and the surface of the perovskite solar cell is protected. According to the invention, the energy loss caused by charge recombination and interface defects can be reduced, the morphology of the interface can be optimized, the roughness of the interface can be reduced, a smoother path is provided for electron transmission, the charge transfer resistance at the interface is reduced, and the overall photoelectric conversion efficiency of the cell is improved.

The invention belongs to the field of organic synthesis, and particularly relates to preparation of 2-fluoro-3-aminobenzoic acid and ester compounds thereof. The reaction formula is shown in the specification, and specifically, a compound II is obtained by carrying out nitration reaction on a compound I serving as a raw material; carrying out halogenation reaction on the obtained compound II to obtain a compound III; fluorinating the compound III under proper reaction conditions to obtain a compound IV; preparing a compound V from the obtained compound IV in a hydrolysis or alcoholysis manner; performing catalytic hydrogenation dehalogenation on the compound V to obtain 2-fluoro-3-aminobenzoic acid and ester compounds shown as a compound X; the starting materials of the process route are cheap and easily available, the process flow is common unit operation in fine chemical engineering, the operation is convenient, the reaction conversion rate is high, and the selectivity is good. The completion of the invention provides an effective preparation method for industrial development of the compounds. # imgabs0 #

The present invention relates to a process for preparing aniline or an aniline conversion product, comprising the steps of (A) providing aminobenzoic acid; (B) decarboxylating the aminobenzoic acid in a reactor at a reaction temperature in the range from 170° C. to 350° C. to give aniline and carbon dioxide, wherein the decarboxylation is conducted at a reaction pressure at which the boiling point of aniline is reached or—preferably—exceeded, such that a first, liquid, phase possibly containing solid particles and a second, gaseous, phase form in the reactor, with a gaseous stream containing aniline and carbon dioxide being discharged from the reactor; and (C) condensing and optionally purifying the aniline present in the gaseous stream; and (D) optionally, converting the aniline obtained in (C) to an aniline conversion product.

The invention discloses conductive silver paste doped with graphene powder and a preparation method of the conductive silver paste, and relates to the technical field of conductive silver paste. The method comprises the following steps: performing nitrogen doping on graphene by using plasma, introducing nitrogen atoms into graphene crystal lattices to form nitrogen-doped graphene, and introducing oxygen-containing functional groups on the surface of the graphene through a plasma surface modification technology to further improve the conductivity. The preparation method comprises the following steps: mixing an aniline monomer and an aminobenzoic acid monomer, carrying out in-situ polymerization on the surface of nitrogen-doped graphene to generate a polyaniline-aminobenzoic acid copolymer, and compounding a graphene-polyaniline material obtained by in-situ polymerization with carbon nanotubes to construct a three-dimensional conductive network. Secondly, the prepared three-dimensional filler is added into conductive silver paste, carboxyl in aminobenzoic acid is adsorbed and combined with silver particles through Van der Waals force, a stable interface structure is formed, the interface resistance is reduced, and the connectivity of a conductive network is enhanced. The prepared conductive silver paste has the effect of high conductivity.

The invention discloses a flame-retardant corrosion-resistant coating and a preparation method thereof, and relates to the technical field of fluorocarbon resin powder coatings. The flame-retardant corrosion-resistant coating comprises the following raw materials in parts by weight: 15-25 parts of fluorocarbon resin, 40-50 parts of epoxy resin, 3-5 parts of a curing agent, 5-7 parts of a reinforcing agent, 4-6 parts of a corrosion inhibitor, 6-8 parts of filler, 1-2 parts of a flatting agent and 0.5-1 part of benzoin. The preparation method comprises the following steps: reacting phosphonitrilic chloride trimer with p-hydroxybenzaldehyde to generate an intermediate 1, reacting the intermediate 1 with p-aminobenzoic acid to generate an intermediate 2, and reacting the intermediate 2 with 2-heptyl ethylene oxide to generate the reinforcing agent. The flame-retardant corrosion-resistant coating prepared by the invention has excellent mechanical properties, corrosion resistance, aging resistance and flame retardance.

The invention belongs to the technical field of polymer insulating materials, and particularly provides a low-temperature-resistant electrical insulating material and a preparation method thereof. The low-temperature-resistant electrical insulating material is prepared from the following raw materials: epoxy resin, a boric acid functional compound, polydimethylsiloxane and carbon fiber cloth, the boric acid functional compound is prepared by reacting modified hyperbranched polyamide-amine, modified nano aluminum oxide and 3-aminophenylboronic acid, and the modified nano aluminum oxide is prepared by modifying nano aluminum oxide with a silane coupling agent. The low-temperature-resistant electrical insulating material prepared by the invention has the advantages of low temperature resistance, self-repairing and excellent mechanical properties.

The invention discloses a method for preparing a liquid polyurethane curing agent from chain extender residues, which comprises the following steps of: carrying out transesterification on excessive micromolecular diol or a mixture of diol and triol and p-aminobenzoic acid lower alkyl ester substances in the chain extender residues in low-viscosity low-molecular-weight polyether polyol; a monofunctional substance is converted into a product with the functionality of 2-3, and the environment-friendly liquid curing agent composition obtained after the reaction can be used for a bi-component solvent-free elastic polyurethane system independently or together with other chain extenders. According to the method, the chain extender residues are developed and recycled on the basis of analyzing the components of the chain extender residues, waste is turned into wealth, pollution to the environment caused by solid waste formed by the chain extender residues is avoided, the production cost of enterprises is reduced, and the requirements of green and clean production are met.

The invention belongs to the technical field of chemical synthesis, and provides a method for preparing 3-methyl-4-aminobenzoic acid through catalytic hydrogenation, which comprises the following steps: mixing 3-methyl-4-nitrobenzoic acid and a solvent, and adjusting the pH value to be alkaline while stirring to obtain a 3-methyl-4-nitrobenzoic acid solution; the method comprises the following steps: pouring a 3-methyl-4-nitrobenzoic acid solution into a reaction kettle, adding a modified palladium catalyst and an auxiliary agent, sequentially replacing with nitrogen and hydrogen for 2-3 times, introducing hydrogen, controlling pressure and temperature, and carrying out hydrogenation reaction to obtain a reactant; and after the reaction kettle is cooled, filtering reactants, adjusting the pH value of filtrate to be weakly acidic, crystallizing and drying to obtain the 3-methyl-4-aminobenzoic acid. The preparation method disclosed by the invention is simple in steps, a required product can be generated by a one-step method, meanwhile, the used modified palladium catalyst can be recycled, the generation amount of three wastes is small, coordinated development of economic benefits and environmental benefits is realized, and the 3-methyl-4-aminobenzoic acid is high in yield and purity and has a relatively good application value.