61 results about "Mercaptobenzimidazol" patented technology

The invention relates to a process for recycling and regenerating a waste lithium iron phosphate positive electrode material by using a specific chelating agent. The method comprises the following steps: carrying out heat treatment on a waste lithium iron phosphate positive electrode material, putting separated waste lithium iron phosphate powder into a ball milling tank, adding organic acid and a chelating agent, and carrying out ball milling; after the ball milling is finished, adding hydrogen peroxide, uniformly stirring and mixing, adjusting the pH value to 2-3 by using nitric acid, and filtering to obtain a filter cake which is iron phosphate; adding saturated sodium carbonate into the filtrate, precipitating, and recovering lithium carbonate; putting the iron phosphate, the lithium carbonate, the iron source, the lithium source and the phosphorus source in the step S3 into a ball mill for ball milling, and performing high-temperature solid-phase sintering after ball milling to obtain a regenerated lithium iron phosphate material; the chelating agent disclosed by the invention is prepared from (9ci)-2-(2-propenyl)-1-cyclopentene-1-carboxylic acid, 2-mercaptobenzimidazole carboxylic acid, an ethylene boric anhydride pyridine complex and potassium persulfate. The regenerated lithium iron phosphate material prepared by the method has excellent electrochemical performance.

The invention relates to the technical field of high polymer material and polymer modification, in particular to modified asphalt based on nano material reinforcement and a preparation method, the modified asphalt comprises matrix asphalt subjected to molecular cutting and compounding, a nano titanium dioxide-graphene-carbon nano tube ternary composite material, zwitter-ion and silane synergistically modified nano montmorillonite, the rubber powder subjected to special treatment, the bio-based and traditional compound plasticizer and the 2-mercaptobenzimidazole and sulfur compound stabilizer are synergistically modified. The modified asphalt has the advantages of excellent performance, high-temperature stability, low-temperature crack resistance, strong aging resistance, efficient and environment-friendly preparation process, low energy consumption, short period and good nanometer material dispersion, and adopts the bio-based plasticizer to promote the green development of the asphalt industry.

The invention provides a high-molecular adsorption material with high selectivity on platinum group metals as well as a preparation method and application of the high-molecular adsorption material, and belongs to the technical field of material science. Comprising the following steps: (1) preparing a methanol solution containing platinum group metal ions, and adding a functional monomer mixture and modified graphene oxide to form a pre-assembled compound; (2) adding a cross-linking agent and an initiator, removing oxygen, and polymerizing to obtain a polymer; and (3) grinding the polymer, eluting metal ions, washing to be neutral, and drying. The high-molecular adsorption material provided by the invention takes modified graphene oxide as a support body, template molecules and specific functional monomers (4-vinylpyridine and 2-mercaptobenzimidazole) are combined to form a pre-assembled compound, then a cross-linking agent and an initiator are added, recognition sites are fixed through cross-linking polymerization, and finally, the high-molecular adsorption material is obtained after the template molecules are eluted. The adsorbent is high in adsorption rate, capable of specifically adsorbing platinum group metal, good in stability and reproducibility and capable of being repeatedly used.

The invention discloses a self-cleaning rubber connecting pipe for a drainage system, and belongs to the technical field of drainage pipes, the rubber connecting pipe comprises the following raw materials: 30-35 parts of ethylene propylene diene monomer, 2.5-2.8 parts of carbon black, 1-1.2 parts of an accelerant, 15-20 parts of calcium carbonate, 3.0 parts of paraffin oil, 2.0-2.5 parts of polytetrafluoroethylene, 1.5 parts of zinc oxide and 1.2-2.2 parts of copper-mercaptobenzimidazole / boron nitride, through a hydrothermal synthesis method, boron nitride with a two-dimensional layered structure is taken as a carrier, copper-mercapto benzimidazole is loaded on the carrier to form a copper-mercapto benzimidazole / boron nitride material, the copper-mercapto benzimidazole / boron nitride material is added into a rubber connecting raw material, the adding amount is controlled, and the lubricating property and the antibacterial property of the rubber connecting pipe are improved through the synergistic effect of the three components, so that the surface of the rubber connecting pipe is kept clean.

The invention discloses a preparation method of a proton pump inhibitor intermediate, which comprises the following steps: (1) carrying out condensation reaction on 2-mercapto-5-aminobenzimidazole and 2, 5-dimethoxytetrahydrofuran in an acetic acid medium; (2) after the reaction is finished, adding a solvent 1 into the obtained reaction liquid, and separating out a wet product solid; (3) dissolving the wet product solid obtained in the step (2) in a solvent 2, and then adjusting the pH value of the reaction solution to 10.5-12.5 by using an alkaline solution; then adding a solvent 3 to perform extraction operation on the reaction liquid, and collecting an organic phase; and (4) concentrating and drying: concentrating and drying the organic phase obtained in the step (3) to obtain the proton pump inhibitor intermediate 5-(1H-pyrrole-1-yl)-2-mercaptobenzimidazole, and the proton pump inhibitor intermediate obtained by the invention has high yield, high content and good appearance.

The invention discloses a heat-resistant and insulating EPDM rubber compound, comprising the following raw materials in parts by weight: 100-125 parts of EPDM rubber, 8-10 parts of maleic anhydride, 0.5-0.6 parts of initiator, 4-5 parts of zinc oxide, 1-2 parts of stearic acid, 5-6 parts of modified POSS, 4-5 parts of reinforcing agent, 0.5-1 parts of sulfur, 4-4.5 parts of vulcanizing agent, 0.5-0.7 parts of vulcanization accelerator, 6-8 parts of tackifier, 50-60 parts of filler and 40-50 parts of plasticizer. EPDM rubber is resistant to low temperature and has excellent insulation. Modified POSS introduces DOPO structure, maleimide structure and urea structure to enhance the high temperature resistance, flame retardancy and mechanical properties of the rubber compound. The reinforcing agent contains mercaptobenzimidazole structure, aniline structure and carbon nanotubes to improve the metal corrosion resistance, thermal oxidation aging resistance, mechanical properties and wear resistance of the rubber compound.

The invention discloses a synthesis method of 5-(1H-pyrrole-1-yl)-2-mercaptobenzimidazole, which comprises the following steps: carrying out cyclization condensation reaction on o-phenylenediamine and thiourea in an acidic environment provided by hydrochloric acid to obtain 2-mercaptobenzimidazole; the preparation method comprises the following steps: carrying out nitration reaction on 2-mercaptobenzimidazole, sulfuric acid and nitric acid to obtain 2-mercapto-5-nitrobenzimidazole; the preparation method comprises the following steps: carrying out nitro reduction reaction on 2-sulfydryl-5-nitrobenzimidazole and hydrogen under the catalysis of nickel to obtain 5-amino-2-sulfydryl benzimidazole; the preparation method comprises the following steps: carrying out an N-alkylation reaction on 5-amino-2-mercapto benzimidazole and tetrahydro-2, 5-dimethoxyfuran under the catalysis of copper chloride to generate 5-(1H-pyrrole-1-yl)-2-mercapto benzimidazole, and carrying out a reaction on the 5-amino-2-mercapto benzimidazole and tetrahydro-2, 5-dimethoxyfuran to generate the 5-(1H-pyrrole-1-yl)-2-mercapto benzimidazole. The method disclosed by the invention has the outstanding advantages of mild and easily-controlled conditions, simple and convenient post-treatment, high yield, economy, environmental protection, suitability for large-scale production and the like, conforms to the green chemical development concept, and has important application value.

The application belongs to the technical field of corrosion protection of oil and gas wells and gathering pipelines, and specifically discloses a kind of corrosion and scale inhibition composition, corrosion and scale inhibitor and its preparation method and application. The corrosion and scale inhibition composition comprises: 40-50 parts by weight of mercapto benzimidazole derivative, 10-20 parts by weight of synergist, 8-15 parts by weight of compound auxiliary agent, 3-8 parts by weight of surfactant, appropriate amount of alkaline pH regulator and appropriate amount of solvent. The composition of the application has excellent corrosion and scale inhibition performance, and the components are compatible, without precipitation, flocculation and other phenomena, and the problem of decomposition of active ingredients during use, showing excellent stability and corrosion and scale inhibition synergistic effect.

The invention relates to the technical field of NBR composite materials, in particular to a low-temperature-resistant wear-resistant NBR composite material and a preparation method and application thereof. The invention provides a low-temperature-resistant wear-resistant NBR (nitrile-butadiene rubber) composite material, which is prepared from the following components in parts by mass: 100 parts of NBR raw rubber, 2 to 6 parts of zinc oxide, 0.5 to 2 parts of stearic acid, 30 to 80 parts of carbon black, 1 to 3 parts of 2-mercaptobenzimidazole, 2 to 12 parts of oleylamine grafted halloysite nanotubes, 0.5 to 2 parts of sulfur and 0.5 to 4 parts of N-cyclohexyl-2-benzothiazole sulfenamide. According to the low-temperature-resistant wear-resistant NBR composite material, the compatibility of the additive and the NBR raw rubber is good, and the blooming phenomenon is avoided.

The invention belongs to the technical field of silver etching liquid, and particularly discloses phosphorus-free environment-friendly silver etching liquid as well as a preparation method and application thereof. The phosphorus-free environment-friendly silver etching solution is prepared from the following components in percentage by mass: 25 to 40 percent of inorganic acid, 10 to 20 percent of organic acid, 1 to 5 percent of silver chelating agent, 5 to 12 percent of alkalescent salt, 3 to 5 percent of 2-mercapto benzimidazole derivative, 1 to 3 percent of methoxypolyethylene glycol and the balance of water. The 2-sulfydryl benzimidazole derivative is at least one of 2-sulfydryl-5-methoxy benzimidazole, 2-sulfydryl-5-methyl benzimidazole and 5-amino-2-sulfydryl benzimidazole, and the 2-sulfydryl benzimidazole derivative is at least one of 2-sulfydryl-5-methoxy benzimidazole, 2-sulfydryl-5-methyl benzimidazole and 5-amino-2-sulfydryl benzimidazole. According to the formula, phosphoric acid is not added, all the components cooperate to achieve rapid etching, high-precision patterns and no crevice corrosion and silver after-tack phenomena, waste water is easy to treat, and the cost is lower.

The application relates to the technical field of ABS particle preparation, and discloses an antibacterial ABS particle and a preparation method thereof, the antibacterial ABS particle comprising the following raw materials: ABS resin, anti-aging natural rubber, a flame retardant, a lubricant, an ultraviolet absorber, antibacterial halloysite nanotubes and an initiator; wherein the anti-aging natural rubber is prepared by reacting epoxidized natural rubber with 2-mercaptobenzimidazole; the antibacterial halloysite nanotubes are prepared by reacting halloysite nanotubes with isonicotinic acid, and then reacting with 8-bromo-1-octene. The antibacterial ABS particle prepared by the application has excellent impact resistance, toughness, anti-aging performance and antibacterial performance, can exert long-term antibacterial and anti-aging effects, can meet the application requirements in various environments, greatly expands the use field of the ABS particle, significantly prolongs the service life of the ABS particle, and can generate great economic benefits.

The invention provides a copper electroplating solution, a preparation method and application thereof, a solar cell and a photovoltaic module, and relates to the technical field of solar cells. The copper electroplating liquid comprises a copper ion source, a main complexing agent, an auxiliary complexing agent, conductive salt, a functional additive and water, wherein the functional additive is prepared from a 2-mercapto benzimidazole-zinc complex, L-ascorbic acid, 3-mercapto-1-sodium propanesulfonate, sodium polyaspartate and water. The copper electroplating solution is free of corrosion to a silicon substrate and a passivation layer, the structural integrity of a battery is guaranteed, efficient deposition of a compact and low-resistance copper layer is achieved through the synergistic effect of a double-complexing system and a functional additive, and the conductivity and the interface bonding force are improved; meanwhile, the formed chemical bonding interface enhances the copper-silver adhesion, the electrical property and long-term reliability of the cell are remarkably improved, and the method is suitable for large-scale manufacturing of the high-performance back contact solar cell.

This invention relates to the field of printed circuit board manufacturing technology and discloses a fine etching process for PCB circuit patterns. The process includes injecting a fine etching composition comprising deionized water, hydrochloric acid, copper chloride dihydrate, anhydrous magnesium chloride, p-toluenesulfonic acid monohydrate, polyethylene glycol, and 2-mercaptobenzimidazole into a circulating working tank of an etching machine; setting the temperature of the working solution in the circulating working tank; sending the substrate to be etched, after dry film development, into a spray section; activating the spray array and setting the spray pressure to etch the substrate; and rapidly rinsing the etched substrate in a deionized water washing section, followed by strong air drying to obtain the circuit pattern. This invention reduces surface tension through specific components to promote solution penetration into the microstructure, utilizes an organic corrosion inhibitor to form a stable protective layer on the trench sidewalls, and combines the vertical impact of the nozzle jet on the bottom, leveraging the difference between mechanical force and chemical adsorption force to achieve anisotropic etching, thus suppressing lateral corrosion of fine circuits.

This invention provides modified zinc oxide and its applications, UV- and ozone-resistant self-lubricating materials and their preparation methods and applications, relating to the field of composite material technology. The modified zinc oxide provided by this invention is obtained by grafting zinc oxide onto a silane coupling agent using 2-mercaptobenzimidazole. The modified zinc oxide provided by this invention combines the excellent aging resistance of 2-mercaptobenzimidazole with the excellent UV absorption properties of zinc oxide, while also improving the dispersibility of nano-zinc oxide and overcoming the volatilization and migration problems of 2-mercaptobenzimidazole. This significantly improves the UV and ozone resistance of resin composites and effectively enhances their wear resistance. Resin composites filled with modified zinc oxide exhibit good reliability and service life in near-space environments, and show promising application prospects as self-lubricating pad materials for steering, load-bearing, rotating, and bushing components of aircraft.

The application discloses an anti-aging luggage cloth and a preparation method thereof. Polyethylene imine is mixed into PVC in a blending mode to obtain a PVC blending film. Water in the polyethylene imine aqueous solution plays a role of a pore forming agent in the film forming process. The volume originally occupied by water molecules forms a pore structure, which is beneficial to the subsequent loading of titanium dioxide and 2-mercaptobenzimidazole, improves the loading capacity, and further improves the anti-aging performance of the luggage cloth. Titanium acid tetraisopropyl ester and 2-mercaptobenzimidazole are added into an ethanol solution to avoid the direct addition of titanium dioxide powder and 2-mercaptobenzimidazole, and the problem of easy agglomeration. The titanium dioxide and 2-mercaptobenzimidazole jointly improve the anti-aging performance of the cloth. Then, under the action of a crosslinking agent, epoxy chloropropane, the titanium dioxide and 2-mercaptobenzimidazole are firmly attached to the PVC film and are not easy to fall off. After multiple water washing, the luggage cloth still has good anti-aging performance.

The invention provides an oxidized ore gold collecting agent which comprises the following components in parts by weight: 40 to 200 parts of aliphatic amine, 20 to 40 parts of aliphatic sulfate, 8 to 12 parts of methyl isobutyl carbinol, 3 to 6 parts of 2-mercaptobenzimidazole, 2 to 7 parts of ammonium citrate and 1 to 3 parts of 2-hydroxy-3-naphthalene mehydroxamic acid. The collecting agent can obtain a more stable adsorption layer and higher adsorption layer density, the adsorption capacity of the collecting agent on a bubble / flotation liquid phase interface is increased, and the yield reaches 80% or above.

The invention relates to the field of flame-retardant materials, in particular to a corrosion-resistant flame-retardant composite pipe and a preparation method thereof.The composite pipe is prepared from, by weight, 60-80 parts of nylon resin, 15-25 parts of glass fiber, 5-18 parts of halogen-free flame retardant, 3-7 parts of compatilizer, 2.1-3.5 parts of lubricant, 0.6-1.2 parts of antioxidant and 1-3 parts of antistatic agent; the halogen-free flame retardant is prepared by carrying out a click chemical reaction of sulfydryl-double bonds on propadiene phosphoramidated hectorite and sulfydryl benzimidazole. The flame retardant prepared by the invention not only has excellent environmental protection property and flame retardance, but also greatly improves the cold resistance, impact resistance and acid resistance of the nylon material.

The invention discloses a copper-titanium etching solution, and relates to the technical field of microelectronic device manufacturing, and the copper-titanium etching solution comprises the following components by mass: 4.5-8.5% of ammonium persulfate; 1.5%-3.5% of urea peroxide; 1.0% to 2.0% of 1-hydroxybenzotriazole-5-carboxylic acid; 0.3% to 0.9% of 2-mercapto benzimidazole; 0.5% to 1.5% of sulfobutyl ether-beta-cyclodextrin; 0.8%-2.2% of L-aspartic acid-N, N-diacetic acid; 0.1% to 0.7% of iso-tridecanol polyoxyethylene ether; 0.05%-0.15% of ceric ammonium nitrate; 0.02% to 0.08% of sodium polyacrylate; and the balance of deionized water. According to the method, the matching problem of the etching rate is solved, the stability is improved, and substrate corrosion is avoided.

The invention relates to the technical field of power cable insulating materials, and discloses a compression-resistant insulating power cable material, a preparation method and a power cable, the insulating material comprises the following raw materials: low density polyethylene, ethylene propylene diene monomer, N, N '-m-phenylenedimaleimide, 2-mercaptobenzimidazole, zinc stearate, zinc methacrylate and dicumyl peroxide. In the preparation process, N, N '-m-phenylenedimaleimide and 2-sulfydryl benzimidazole are subjected to an in-situ addition reaction to generate a macromolecular crosslinking precursor, and free sulfydryl masking is realized. The precursor and zinc methacrylate are subjected to coordination to form polar nodes, and a homogeneous cross-linked network containing electron deep traps and dynamic sacrificial bonds is constructed after cross-linking and curing. Under the condition that no inorganic filler is added, irreversible slippage and space charge accumulation of macromolecular chain segments in an insulator are effectively inhibited, so that the cable material has high compression resistance, low creep deformation, high electrical strength and long-acting thermo-oxidative aging resistance.

The invention relates to the technical field of rubber, in particular to a high-temperature-resistant rubber-based elbow and a preparation method thereof. The preparation method comprises the following steps: blending a flexible flame-retardant acrylic copolymer and fluororubber, stirring, dissolving, demulsifying, washing with water, and drying in vacuum to obtain the modified fluororubber. Mixing butyl rubber, vinyl modified white carbon black, sulfur, activating agent zinc oxide and accelerating agent 2-mercaptobenzimidazole, and performing mixing and calendering to obtain an inner rubber layer; mixing modified fluororubber, vinyl modified white carbon black, bisphenol AF, an activator calcium hydroxide and an accelerant benzyl triphenyl phosphorus chloride, and carrying out mixing and calendering to obtain an outer rubber layer; an inner rubber layer, a nylon fabric layer and an outer rubber layer are sequentially laid, steel wires are wound after vulcanization, and the rubber-based elbow is obtained; and then the connecting piece and the rubber-based elbow are assembled and formed, and a finished product is obtained. The finished product prepared by the invention has good high-temperature resistance, flame retardance and mechanical properties, so that the finished product has a wide application prospect in the technical field of rubber.

The invention discloses a green deplating solution for a photovoltaic welding strip and a valuable metal separation and recovery method. The deplating solution is an aqueous solution, and solutes comprise a main oxidizing agent, a green acidic auxiliary agent, a complexing cosolvent and a copper special corrosion inhibitor; the main oxidant is selected from sodium persulfate, ammonium persulfate and ferric nitrate; the green acidic auxiliary agent is selected from sulfamic acid, methanesulfonic acid, tartaric acid and citric acid; the complexing cosolvent is selected from sodium chloride, ammonium chloride and thiourea; and the corrosion inhibitor is selected from benzotriazole, methyl benzotriazole and 2-mercapto benzimidazole. The waste welding strip is subjected to an immersion reaction at the temperature of 20-60 DEG C, tin, lead and / or silver enter the solution in the form of complex ions, and a copper substrate is kept bright and clean; and after solid-liquid separation, gradient recovery of silver extraction by replacement, lead separation by temperature difference crystallization and tin precipitation by hydrolysis can be adopted, or total replacement recovery by adding excessive zinc-based displacer can be adopted. The separation and recovery method is rapid in deplating, free of white films, low in copper loss and suitable for silver-containing and silver-free solder strips.

The present application relates to the paint technical field, especially relates to a kind of nano composite material EP@DA@GO@M and preparation method thereof, water-based epoxy heavy-duty anticorrosive coating with slow-release function and preparation method thereof.The preparation method of the nano composite material EP@DA@GO@M includes the following steps: water-based graphene slurry a is diluted to obtain graphene slurry b;Dopamine, catalyst, water and 1,6-hexanediol diglycidyl ether are mixed to form mixed solution C;Graphene slurry b is added in mixed solution C, and mixed at (25~35) ℃ for (20~24) h to obtain composite material EP@DA@GO;2-mercapto benzimidazole anhydrous ethanol solution is added to silane coupling agent to obtain mixture KM;After EP@DA@GO, water and KM are mixed, heated to react to obtain nano composite material EP@DA@GO@M.The nano composite material EP@DA@GO@M prepared by the present application is applied in water-based epoxy coating, can effectively improve the anticorrosion of water-based epoxy coating, realizes long-acting anticorrosive function of water-based epoxy coating, in addition, its preparation raw material is biological material, and coating is green and environment-friendly.

The present invention provides an enterotoxin C Raman sensing analysis method based on Au-Ag Janus@Au NPs, belonging to the technical field of Raman spectroscopy analysis. The present invention first synthesizes Au-Ag Janus NPs by guiding the directional growth of Ag islands on Au cores through 2-mercaptobenzimidazole-5-carboxylic acid (MBIA), and the ligand MBIA also acts as a Raman beacon molecule. By regulating the pH, an Au layer is grown on the surface of Au-Ag Janus NPs to obtain Au-Ag Janus@Au NPs, which have a stronger and more stable SERS signal. With MBIA 1278cm ‑1 Using the SERS signal at the site as the detection signal, a Raman sensor for detecting enterotoxin C was designed. The Raman sensor has the advantages of good sensitivity, high accuracy, strong stability and strong anti-interference ability.

The invention relates to a preparation method and application of 5-(1H-pyrrole-1-yl)-2-mercaptobenzimidazole, according to the preparation method, key parameters such as an ester extraction solvent, a pH adjusting range, a pulping solvent, a ratio of a concentrated solution to the pulping solvent and the like are determined to cooperate with each other, and efficient separation and purification of a product are realized. And the synergistic improvement of economy, environmental protection, high yield and high content is realized. The solvents and reagents selected in the whole process are conventional chemical raw materials, are low in price and easy to obtain, and the solvents and mother liquor can be recycled and reused, so that the production cost is further reduced; the operation process is simplified, the production cost and the environmental protection pressure are reduced, and the environmental protection requirement of industrial production is met; the yield of the target product can be stably kept at 74% or above, the purity can reach 99% or above, and the content is higher than 97%. The prepared product can be applied to preparation of ilaprazole, meets the quality requirement for preparation of qualified ilaprazole bulk drugs, and has important industrial application value.

The invention discloses a preparation method of a flame-retardant high-elasticity fabric, and relates to the technical field of textile materials. When the flame-retardant high-elasticity fabric is prepared, soybean oil and 2-mercaptobenzimidazole initiate grafting and then react with 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride to prepare modified soybean oil, then the modified soybean oil reacts with diethanol amine to synthesize modified soybean oil diethanolamide, the modified soybean oil diethanolamide is used as a chain extender, and the flame-retardant high-elasticity fabric is prepared. The preparation method comprises the following steps: polymerizing the modified polyurethane with polytetramethylene ether glycol 2000, isophorone diisocyanate and a glycol ultraviolet absorbent to prepare modified polyurethane, and carrying out wet spinning to prepare functional polyurethane fibers; the preparation method comprises the following steps: carrying out condensation on m-phenylenediamine and phenylphosphonic dichloride to synthesize a flame-retardant intermediate, participating in meta-aramid polymerization to prepare modified aramid, and carrying out wet spinning to prepare flame-retardant aramid fibers; the two kinds of fibers are blended in proportion and subjected to post-treatment, and the flame-retardant high-elasticity fabric is obtained. The fabric prepared by the method has excellent flame retardance, ultraviolet resistance, oxidation resistance, high elasticity and mechanical strength.

The invention provides a method for synthesizing a benzimidazobenzothiazole compound, and belongs to the technical field of fine chemical synthesis. The preparation method comprises the following steps: mixing a 2-mercapto benzimidazole compound, fluoride, alkali, an additive, a molecular sieve and dichloromethane, then adding a benzyne precursor into the mixture, and synthesizing the benzimidazobenzothiazole compound at 110 DEG C; the method has the advantages of simplicity, convenience, rapidness, no need of transition metal catalysis, wide substrate range, cheap and easily available fluorine source, no environmental pollution and the like; the method has the advantages of being simple in process, good in universality and the like, the yield of the synthesized benzimidazobenzothiazole compound is as high as 90%, and the method has extremely high industrial popularization value.

The invention provides a preparation method and application of a reaction type antioxidant based on a sulfydryl-containing benzimidazole micromolecular antioxidant, and the preparation method comprises the following steps: in the presence of a catalyst, carrying out Michael addition reaction on the sulfydryl-containing benzimidazole antioxidant and a bio-based monomer containing double bonds and carboxyl to obtain an intermediate compound; and in the presence of a condensing agent and an activating agent, carrying out esterification reaction on the intermediate compound and cellulose to obtain the reaction type antioxidant based on the sulfydryl-containing benzimidazole micromolecular antioxidant. According to the method, a bio-based monomer containing double bonds and carboxyl and a cellulose chemical grafting micromolecular mercapto-containing benzimidazole antioxidant are adopted to construct a molecular structure with high molecular weight characteristics and multiple antioxidant functions, the bio-based monomer containing double bonds and carboxyl is used as a bridging agent, the micromolecular antioxidant is bonded into a rubber molecular chain, and the molecular structure is formed by compounding the bio-based monomer containing double bonds and carboxyl and the cellulose chemical grafting micromolecular mercapto-containing benzimidazole antioxidant. The problems of migration, volatilization and environmental compatibility of micromolecular antioxidants are fundamentally solved, meanwhile, the anti-oxidation efficiency and the material durability are improved, and the service life of latex gloves is prolonged.

The invention relates to the field of anticorrosive coatings, and particularly discloses a self-repairing anticorrosive coating and a preparation method thereof. The self-repairing anticorrosive coating comprises the following raw materials: 100 parts of bisphenol A epoxy resin, 35-40 parts of butyl acetate, 1-5 parts of a filler, 45-55 parts of a polyamide curing agent, 1-2 parts of a wetting dispersant and 2-5 parts of an auxiliary agent, wherein the filler comprises 2-mercaptobenzimidazole intercalated magnesium aluminum hydrotalcite and 8-hydroxyquinoline intercalated montmorillonite in a weight ratio of (0.5-2.0): 1. The 2-mercaptobenzimidazole intercalated magnesium-aluminum hydrotalcite and the 8-hydroxyquinoline intercalated montmorillonite are added into the anticorrosive coating, the anticorrosive coating with better corrosion resistance is prepared by utilizing the synergistic effect of the 2-mercaptobenzimidazole intercalated magnesium-aluminum hydrotalcite and the 8-hydroxyquinoline intercalated montmorillonite, and the anticorrosive coating also has ion stimulation response self-repairing performance, so that release of a corrosion inhibitor in the coating is effectively controlled, and the service life of the coating is prolonged. The anti-corrosion period and the protection performance of the coating are improved, and the service life of the anti-corrosion coating is prolonged.

According to the external preparation composition containing the S-flurbiprofen and the preparation method of the external preparation composition, 2-mercapto benzimidazole and isopropyl myristate are compounded to serve as a stabilizer, the dosage and the proportion of the 2-mercapto benzimidazole and the isopropyl myristate are controlled, and the external preparation composition containing the S-flurbiprofen is obtained and has the advantages that the content of the S-flurbiprofen is stable; the external preparation composition of the S-flurbiprofen has the advantages of simple preparation process, low probability of crystallization, uniform release and stable quality, and is suitable for industrial large-scale production, and the whole preparation method is simple.

The invention discloses an ammonolysis reagent and application thereof in synthesis of diaminopurine oligonucleotide, and belongs to the technical field of oligonucleotide synthesis, and the synthesis of the oligonucleotide containing diaminopurine comprises the steps of deprotection, coupling, oxidation or vulcanization, capping and the like. The ammonolysis reagent comprises methylamine and ammonia water, and further comprises 2-mercaptobenzimidazole and a modified imidazole compound, and the modified imidazole compound has a phenylimidazole group and a pyrimidine group. The ammonolysis reagent can realize ammonolysis of oligonucleotide containing diaminopurine, shorten the ammonolysis time, improve the purity of full-length chain nucleic acid of a target product and facilitate removal of an iBu protecting group on diaminopurine N2-.