134 results about "Methyl benzoate" patented technology

The invention discloses incombustible water-based aerosol spray paint and a preparation method thereof, and relates to the technical field of spray paint. When the non-combustible water-based aerosol spray paint is prepared, firstly, p-(triethoxysilyl) acetophenone reacts with trimethylchlorosilane, and then the reaction product and tetramethyl tetravinyl cyclotetrasiloxane are subjected to ring opening polymerization to obtain modified polysiloxane; grafting epoxy resin with 4-vinyl-methyl benzoate, reacting with modified polysiloxane to obtain modified epoxy resin, and emulsifying to obtain a modified epoxy resin emulsion; secondly, reacting the silicon dioxide subjected to acylating chlorination with 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radicals, reacting with 3-(3-thienyl) propionaldehyde, and reacting with thiophene and 3-vinyl thiophene to obtain modified silicon dioxide; and finally, mixing the modified epoxy resin emulsion, pure water, the modified silicon dioxide, a curing agent and a photoinitiator to prepare the incombustible water-based aerosol spray paint.

The invention relates to an aroma durability improving agent and a preparation method thereof, an essence and a shampoo product, and the aroma durability improving agent comprises the following components in percentage by weight: 40%-60% of a component A, 1%-0.5% of a component B, 10%-20% of a component C, 10%-20% of a component D, 5%-10% of isooctyl salicylate, 10%-20% of a perfume component and the balance of a solvent, wherein the component A is prepared from 2-[[3-[2-methyl-4-(2-methylpropyl) phenyl] propylidene] amino] methyl benzoate; the long-lasting fragrance can be effectively improved, the preparation process is simple, the production cost is low, the compatibility is good, and the long-lasting fragrance is suitable for various essences or hair washing products.

The invention relates to the technical field of paint, and discloses high-gloss spray paint for motorcycles and a spraying process of the high-gloss spray paint. The high-gloss spray paint is prepared from the following raw materials in parts by mass: 8 to 12 parts of polyethylene glycol-polycaprolactone-acrylate, 15 to 20 parts of sulfydryl acrylate, 20 to 30 parts of acrylic resin, 6 to 10 parts of additive, 8 to 15 parts of metallic pigment, 20 to 30 parts of amino resin, 1 to 2 parts of flatting agent, 15 to 30 parts of solvent, 1 to 2 parts of solvent oil and 0.02 to 0.05 part of photoinitiator. The additive is prepared from silane modified tert-butyl methyl benzoate, double-bond modified tert-butyl methyl benzoate and an assistant cross-linking agent according to the mass ratio of (1 to 2) to (5 to 6) to 1; the preparation method of the assistant crosslinker comprises the following steps: adding 5-amino-2, 4-di-tert-butyl methyl benzoate and triphenylmethane triisocyanate into tetrahydrofuran, uniformly mixing, stirring to react for 6-8 hours at 70-90 DEG C, and removing the solvent to obtain the assistant crosslinker.

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 invention belongs to the technical field of synthesis of ester compounds, and particularly relates to a preparation method of 2, 6-dichloro-4-cyanobenzoic acid methyl ester, which comprises the following steps: by taking dimethyl 2-aminoterephthalate as a raw material, sequentially carrying out substitution reaction, deamination reaction, hydrolysis reaction, amidation reaction and dehydration reaction to obtain the 2, 6-dichloro-4-cyanobenzoic acid methyl ester. The 2, 6-dichloro-4-cyanobenzoic acid methyl ester is prepared by the method, and the yield reaches 59.28%. The N-chlorosuccinimide is used as a chlorine source to carry out substitution reaction on the 2-amino dimethyl terephthalate, so that the potential safety hazard caused by the traditional chlorination reagent is avoided, and the tert-butyl nitrite used in the deamination reaction avoids the potential safety hazard caused by the use of strong corrosive sulfuric acid; the amidation reaction is completed in one step by adopting a condensing agent, so that the complicated operation caused by firstly preparing acyl chloride and then carrying out condensation reaction is avoided, and therefore, the preparation method has the characteristics of safe preparation process, environment friendliness, simplicity in operation and the like under the condition of ensuring the product yield and purity.

The invention discloses a synthesis method of a Vinetoram key intermediate and Vinetoram, and relates to the technical field of organic synthesis.The synthesis method comprises the steps that 1-((4 '-chloro-5, 5-dimethyl-3, 4, 5, 6-tetrahydro-[1, 1'-biphenyl]-2-yl) methyl) piperazine hydrochloride and 2-((1H-pyrrolo [2, 3-b] pyridine-5-yl) oxy)-4-bromobenzoic acid methyl ester are used as reaction raw materials, a reaction is carried out, and the Vinetoram key intermediate and the synthesis method of the Vinetoram key intermediate are synthesized; the method comprises the following steps: carrying out a substitution reaction and a hydrolysis reaction to obtain a key intermediate of the Venotocork, and carrying out a condensation reaction on the intermediate and 3-nitro-4-((tetrahydro-2H-pyran-4-yl) methylamino) benzenesulfonamide to obtain the Venotocork. The synthesis method has the advantages of short process route, easily available raw materials, mild reaction conditions, high yield and purity of the intermediate and the Vinetoram, facilitation of the improvement of the yield and quality of the Vinetoram, and reduction of the production cost of the Vinetoram.

The present application belongs to the technical field of fermented fruit juice, and particularly relates to a method for preparing high-quality probiotic fermented strawberry juice based on magnetic field assistance. The present application first uses Lactobacillus plantarum CTCF-LP-1 to perform static fermentation on the strawberry juice to be fermented in a fermentation device for more than 24 hours, and then places the fermentation device in a static magnetic field. The static magnetic field reduces the generation of organic acid components by Lactobacillus plantarum during the fermentation process of the strawberry juice, reduces the acidity, and improves the fermentation quality of the strawberry juice. The magnetic field strength of the static magnetic field is 1.0-2.5 mT, and the fermentation time in the static magnetic field is 0.5-1.5 h. After the static fermentation and the magnetic field treatment, the content of malic acid, isocitric acid, glutaconic acid and other organic acid components in the fermented strawberry juice is significantly reduced, while the content of alcohol and ester components such as n-octanol, 2-phenylethanol, methyl benzoate, 3-hexyl hexanoate and butyl valerate is increased, the types of aroma components are more abundant, and the taste and quality of the strawberry juice are significantly improved.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of a 3-phenoxy substituted benzofuran compound. In an inert gas environment, a 2-fluorobenzyl phenyl ether compound as shown in a formula 1 and a methyl benzoate compound as shown in a formula 2 are mixed with an organic solvent tetrahydrofuran to react in the presence of bis (trimethylsilyl) caesium amino, and the 3-phenoxy substituted benzofuran compound as shown in a formula 3 is synthesized under a heating condition. According to the method, the raw materials which are easy to obtain are used, benzofuran is synthesized through a transition-metal-free method, and the method has potential application value in synthesis of active pharmaceutical ingredients.

The invention relates to the field of medicinal chemistry, and provides a preparation method of metoclopramide intermediate methyl 2-methoxy-4-acetamidobenzoate, which comprises the following steps: mixing methyl 2-methoxy-4-acetamidobenzoate and acetic anhydride in a molar ratio of 1: (1.2-2.0) in the absence of a solvent, and reacting at the temperature of 50-80 DEG C; and after the reaction, adding methyl tert-butyl ether for crystallization, cooling and filtering to obtain a product. The method has the advantages that acetic anhydride is used as an acylation reagent; on one hand, compared with acetyl chloride, the reaction is more stable, the reaction controllability is better, and the product purity is high; on the other hand, acetic anhydride is liquid and can serve as a solvent, no extra solvent needs to be added, and cost is saved; meanwhile, no solvent is added, so that the post-treatment process is simplified, the operation is simple, and the yield is higher. The 2-methoxy-4-acetamidobenzoic acid methyl ester prepared on the basis of the method has the purity of 99.8% or above and the yield of 90% or above, and is suitable for industrial production.

The invention relates to a benzohydroxamic acid oximation production wastewater treatment process which is applied to the related technical field of wastewater treatment, wastewater is treated in a manner of combining extraction and air floatation, and low emission and high recovery rate of methyl benzoate are effectively realized, so that the use amount of methyl benzoate in the reaction process is reduced, and the production cost is reduced. The wastewater treatment difficulty and the cost investment are reduced; in addition, in the air floatation process, through the arrangement of the floating type bubble releaser, when blockage affects throwing of the bubble amount, the bubble releasing outer ring on the floating type bubble releaser can be automatically controlled to be in a non-directional floating state, water pressure increased due to blockage can deviate to a fixed point for centralized blockage removal, compared with comprehensive undifferentiated synchronous blockage removal, the needed water pressure is relatively small, and the blockage removal efficiency is improved. Therefore, long-time waiting for water pressure accumulation is not needed after blockage, the recovery of the floating type bubble releaser is greatly accelerated, and the removal effect and efficiency of air floatation treatment on organic matters in wastewater are effectively guaranteed.

The application relates to a preparation method of a benzylamine compound and belongs to the field of organic synthesis. The preparation method of the benzylamine compound is as follows: a reaction formula is shown in the description. The application also provides a preparation method of the compound of the above formula (VI). Compared with methyl o-bromomethylbenzoate used in the prior art, methyl o-chloromethylbenzoate used in the application is cheaper, has lower preparation cost, less pollution and is more environment-friendly. Compared with the prior art, the benzylization reaction of the application has higher reaction conversion rate, less dibenzyl impurities, is convenient for product post-treatment and purification, has higher yield, and has better product quality.

The invention relates to the technical field of ceramic substrates, and provides a high-heat-conductivity multilayer ceramic substrate and a preparation method thereof. The high-thermal-conductivity multilayer ceramic substrate comprises the following raw materials in parts by weight: 80-90 parts of aluminum oxide, 10-15 parts of modified silicon carbide, 5-10 parts of a sintering aid, 3-7 parts of a binder, 5-10 parts of a toughening aid and 60-70 parts of water, wherein the modified silicon carbide is obtained by modifying silicon carbide with 2-amino-5-methyl benzoate. According to the technical scheme, the problem of low heat conductivity of the ceramic substrate in the prior art is solved.

The invention discloses a bentazone intermediate sulfonation-chlorination two-step continuous preparation process which comprises the following steps: continuously metering and adding a solvent, chlorosulfonic acid, triethylamine, isopropylamine and a catalyst into a first-section tubular reactor, and carrying out sulfonation reaction to obtain a reaction material isopropylaminosulfonic acid; continuously introducing the reaction material isopropylamine sulfonic acid into a second section of tubular reactor, and simultaneously continuously metering and adding methyl anthranilate and phosphorus oxychloride for chlorination reaction; after the reaction is finished, quenching the reaction liquid with water, and carrying out layering and distillation treatment to obtain an intermediate o-isopropylamine sulfonamide methyl benzoate solid; and carrying out ring-closure reaction on the intermediate o-isopropylamino sulfonamido methyl benzoate solid and sodium methoxide in a methanol solution to prepare the bentazone active compound. According to the method, the defects of low bentazone product content and poor yield caused by high temperature of intermittent sulfonation and chlorination are effectively overcome, the operation time is shortened, and the productivity is improved.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of a benzofuran compound. In an inert gas environment, a 2-fluorotoluene compound as shown in a formula 1 and a methyl benzoate compound as shown in a formula 2 are mixed and reacted with an organic solvent methyl tert-butyl ether in the presence of bis (trimethylsilyl) amino cesium and cesium sulfate, and the benzofuran compound as shown in a formula 3 is synthesized under a heating condition. Wherein the methyl benzoate compound as shown in the formula 2 can also be replaced by 2-naphthoic acid methyl ester or 1-naphthoic acid methyl ester. The research develops a benzofuran synthesis strategy without transition metal catalysis. According to the method, on the basis of commercially available raw materials, the construction of a benzofuran skeleton is realized through a simple and efficient path. Due to the mild and green reaction characteristic, a route with practical value is provided for synthesis of active medicine molecules and key intermediates of the active medicine molecules.

The objective is to provide a fragrance composition that has high reproducibility of the fragrance of forsythia flowers and excellent palatability. [Solution] The forsythia flower fragrance composition comprises (A) methyl salicylate and / or ethyl salicylate, (B) methyl benzoate and / or ethyl benzoate, and (C) linalool and / or limonene, wherein the total content of component (A) and component (B) is 50 to 90% by mass, and the mass ratio (A / B) is 1 to 10.

The invention belongs to the technical field of microorganisms, and relates to saccharomyces cerevisiae with high yield of flower and fruit fragrance and application thereof. The strain is preserved in the China Center for Type Culture Collection, the preservation number is CCTCC M 20242771, the preservation time is December 10, 2024, the strain is separated from the natural fermentation process of blueberries in Danzhai region of Guizhou province, and the strain has excellent brewing characteristics including high ethanol (13.6% vol) and glycerol (7.48 g / L) yield, low hydrogen sulfide yield, positive killing and the like. When the strain is used for blueberry wine fermentation, the flower fragrance of an obtained blueberry wine sample is richer, the anthocyanin content exceeds that of a wine sample fermented by commercial yeast CECA, flavor analysis shows that the strain has obvious advantages in the aspect of producing key aroma compounds such as methyl benzoate, ethyl propionate, phenethyl acetate and beta-damascenone, and the strain has good application prospects. The OAV value of methyl benzoate in a wine sample fermented by the strain is 306.16, the wine can be endowed with more flower fragrance and fruit fragrance such as cherries, and richer fragrance levels are brought to a wine body.

The application provides a synthesis method and application of an N-phenyl carbazole fluorescent compound for alcohol compound labeling, and belongs to the technical field of fluorescent labeling of organic small-molecule alcohol compounds. The application takes N-phenyl carbazole as a fluorescent parent ring, and imidazole as a reactive group, and the chemical name is 4-(9-carbazole)-benzoylimidazole. The specific preparation method is as follows: (1) reacting carbazole with p-iodobenzoate to obtain 4-(9-carbazolyl)-benzoic acid methyl ester a; (2) reacting a with a potassium hydroxide aqueous solution to obtain 4-(9-carbazolyl)-benzoic acid b; and (3) reacting b with N,N'-carbonyldiimidazole to obtain a target product. The fluorescent labeling reagent can accurately and sensitively label twelve kinds of fatty alcohols, so that the separation and detection of trace fatty alcohols in a complex system can be realized, and the fluorescent labeling and analysis of various fatty alcohols in the research fields of life and food can be carried out, and the application prospect is wide.

The invention discloses a synthetic method of 2-hydroxy-6-methyl benzoate. The synthetic method comprises the following steps: step 1, preparing an intermediate: carrying out Michael addition reaction on crotonaldehyde and 2-halogenated acetoacetate to obtain an intermediate 2-acetyl-2-halo-3-methyl-5-oxovalerate; step 2, preparation of a product: an intermediate 2-acetyl-2-halo-3-methyl-5-oxovalerate is subjected to intramolecular Adol condensation elimination aromatization reaction, 2-hydroxy-6-methyl benzoate is prepared with higher yield from economical and easily available raw materials and reagents under milder conditions, and the method is suitable for industrial production. The initial raw materials, the solvent and the catalyst are industrially cheap and easily available raw materials, so that the cost is low, and the method is more suitable for industrial production; the adopted reaction conditions are mild, byproducts are few, the yield is high, and a target product can be prepared more efficiently; the adopted synthesis route is high in atom economy, adopted solvents and reagents are easy to recycle, generated industrial three wastes are few, and the method is more environmentally friendly.

The application discloses a compound flower and fruit fragrance type latent fragrance compound, a preparation method and application and an application method, and has the following general formula: wherein R represents or. In the technical scheme, 2-amino methyl benzoate is used as raw material, and two acylated derivatives are prepared through acylation reaction. The two compounds are stable in chemical properties, and can release 2-amino methyl benzoate and phenylacetic acid (cinnamic acid) when pyrolyzed at high temperature, and can be applied to cigarettes as stable fragrance precursors to improve smoke and highlight product characteristics.

The application discloses a preparation method of 1,2-propylenediamine, which comprises the following steps: (1) 2-phenyl-5-methyl-2-oxazoline, ZIF-8 catalyst and liquid ammonia are added into a high-pressure reaction kettle, and after temperature rising, stirring and filtration, benzoyl 1,2-propylenediamine is obtained; (2) the benzoyl 1,2-propylenediamine obtained in the step (1), methanol and an alkali metal catalyst are added into an atmospheric pressure reaction kettle with a reflux device, after temperature rising and stirring, sulfuric acid is added to neutralize the alkali metal catalyst, after neutralization, the mixture is filtered, and the filtrate is subjected to distillation to obtain a mixture of methyl benzoate and 1,2-propylenediamine; (3) the mixture obtained in the step (2) is separated by rectification to obtain 1,2-propylenediamine products. The preparation method can reduce the production cost, the process condition is relatively mild, hydrogen is not needed to participate in the amination reaction, the process safety is higher, the raw material conversion rate is high, close to 100% conversion, the synthesis yield is higher than 90%, the preparation process is efficient and safe.

The invention relates to a separation and detection method of oxopyrrolidine compounds and isomers thereof, and belongs to the technical field of pharmaceutical analysis. The separation and detection method comprises the following steps: adopting a high performance liquid chromatography; cellulose-tri-(4-methyl benzoate), cellulose-tri-(halogenated methyl phenyl carbamate), cellulose-tri-(4-chloro-3-methyl phenyl carbamate), amylose-tri-((s)-alpha-methyl benzyl carbamate) and amylose-tri-(3-(4, 5-dichlorophenyl carbamate) are bonded through covalent bonds, and cellulose-tri-(4-methyl benzoate), cellulose-tri-(halogenated methyl phenyl carbamate), cellulose-tri-(4-chloro-3-methyl phenyl carbamate), cellulose-tri-((S)-alpha-methyl benzyl carbamate) and cellulose-tri-(4-chloro-3-methyl phenyl carbamate) are bonded through covalent bonds. A chromatographic column which takes amylose-tri (3-chloro-4-methylphenylcarbamate) covalently bonded on the surface of silica gel as a filler is a separation chromatographic column; a chromatographic column which takes amylose-tri (3-chloro-4-methylphenylcarbamate) or silica gel covalently bonded on the surface of the silica gel as a filler is a separation chromatographic column; and eluting by taking a mixed solution of normal hexane and ethanol as a mobile phase. The method is high in separation degree, high in sensitivity and good in peak pattern.

The invention relates to the technical field of traditional Chinese medicine extracts, and discloses application of methyl 3, 4-dihydroxybenzoate in whitening. The 3, 4-dihydroxy methyl benzoate is extracted from balanophora involucrata, it is found that the 3, 4-dihydroxy methyl benzoate can achieve whitening by inhibiting the activity of tyrosinase, the inhibition rate of the 3, 4-dihydroxy methyl benzoate to the tyrosinase is 59.10% when the concentration is 0.125 mg / ml, the IC50 value is 0.2107 mg / ml, the inhibition rate is about one half of that of positive drug beta-arbutin (the IC50 value is 0.3763 mg / ml), and the inhibition activity is higher. The method has a wide application prospect when being applied to whitening products.

The present application relates to the technical field of polyurethane coating, in particular to a waterproof polyurethane composite coating and a preparation process thereof. The preparation process of the waterproof polyurethane composite coating comprises the following steps: preparing quercetin grafted composite filler, preparing modified isophorone diisocyanate solution and preparing polyurethane composite coating. In the present application, polybutylene adipate, dimethylol butyric acid and dibutyltin dilaurate are mixed with the modified isophorone diisocyanate solution to carry out pre-polymerization, then 2-hydroxy-5-substituted long-chain fatty acyloxy methyl benzoate is added to carry out reaction, long-chain fatty acyloxy and methyl benzoate structure are introduced into the polyurethane molecular chain, trimethylolpropane is added to carry out crosslinking reaction, finally, 1,4-butanediol is added as a chain extender to react with the remaining -NCO to prepare the polyurethane composite coating, which can effectively improve the water resistance and adhesion of the polyurethane composite coating.

The invention discloses a synthesis method of 4-(3-hydrazide oxopropyl) benzoyl hydrazine, and belongs to the field of organic synthesis. According to the invention, 4-(3-ester oxopropyl) methyl benzoate is used as a raw material, and is subjected to a hydrazide reaction with hydrazine hydrate in a reaction solvent to obtain the product 4-(3-hydrazide oxopropyl) benzoyl hydrazine. And under optimal reaction conditions, after the reaction liquid is recycled for multiple times, the comprehensive yield can reach 87%, and the product purity is relatively high.

The invention discloses a strongly-bundled high-insulation glass fiber cloth and a preparation method thereof, and relates to the technical field of glass fiber cloth preparation, the glass fiber cloth is obtained by dipping a fiber cloth obtained by crushing, melting, drawing, yarn preparation, sizing and weaving of a glass raw material in a surface treating agent, after the yarn is subjected to sizing treatment, the strong bundling property meets the requirement, and the surface treating agent is obtained by mixing waterborne polyurethane emulsion prepared from functional diisocyanate and the like with a reinforcing agent and the like. The functional diisocyanate is obtained by carrying out a reaction on 1, 3-dihydroxyethyl adamantane, 3-amino-5-nitrobenzoic acid methyl ester, 4-amino-3-methyl benzonitrile, oleanolic acid and the like; the reinforcing agent is obtained by loading a product e containing aza-adamantane, phosphamide, cyano, hydroxyl and castor oil-based alkane long chains on halloysite nanotubes. The glass fiber cloth disclosed by the invention has relatively high insulativity, mechanical strength, high temperature resistance and flame retardance.

The invention discloses a method for synthesizing loxapine succinate, which comprises the following steps of: carrying out substitution reaction by using 2-nitrofluorobenzene and 2-hydroxy-4-chloromethyl benzoate as raw materials to generate 5-chloro-2-(2-nitrophenoxy) benzoate; nitryl is reduced, and 5-chloro-2-(2-aminophenoxy) benzoate is generated; the method comprises the following steps: carrying out an intramolecular ring closing reaction to generate 2-chlorodibenzo [b, f] [1, 4] oxazepine-11 (10H)-ketone; 2, 11-dichlorodibenzo [b, f] [1, 4] oxazepine is obtained through a reaction and chlorination; the method comprises the following steps: carrying out a C-N coupling reaction of methyl piperazine to generate 2-chloro-11-(4-methylpiperidine-1-yl) dibenzo [b, f] [1, 4] oxazepine; and salifying with succinic acid to generate the loxapine succinate. The method is easily available in raw materials, simple in process and suitable for large-scale production.

The present application relates to the technical field of corrosion inhibitor, and proposes a thiourea modified imidazoline corrosion inhibitor and a preparation method thereof, which comprises the following components by weight: 40-50 parts of thiourea modified imidazoline, 6-8 parts of isopropyl alcohol, 0.1-0.2 parts of potassium iodide, 10-15 parts of an additive, and 35-40 parts of a solvent; the additive is composed of 2-amino-5-iodobenzoic acid methyl ester and a surfactant. Through the above technical solution, the problem of low corrosion inhibition rate and fast corrosion speed of the thiourea modified imidazoline corrosion inhibitor in the prior art is solved.

This invention relates to the field of seawater desalination technology, specifically to a high-permeability and selective reverse osmosis membrane and its preparation method. The high-permeability and selective reverse osmosis membrane is obtained by sequentially immersing a porous support layer in an aqueous solution and an oil solution for interfacial polymerization, thereby forming a desalination layer on the surface of the porous support layer. This invention increases the compatibility of the water / oil phases by adding N-methylpyrrolidone to the aqueous phase and methyl benzoate to the oil phase, thereby reducing the surface tension of the two phase solutions, promoting the diffusion of amine monomers into the organic phase, and altering the surface morphology and polymer chain aggregation state of the separation layer. This results in a higher roughness and cross-linking degree of the desalination layer, and improved permeability and selectivity.

The invention belongs to the technical field of battery electrolyte, and particularly relates to nicotinamide-containing aqueous zinc ion battery electrolyte, a battery and a preparation method. The aqueous zinc ion battery electrolyte provided by the invention comprises the following components: a solvent, zinc salt, nicotinamide and 3-(1, 2, 4-triazole-1-yl) methyl benzoate. Nicotinamide is enriched on an anode / electrolyte interface through chemical adsorption, so that by-product deposition is blocked, dendritic crystals are inhibited, zinc nucleation overpotential is remarkably reduced, uniform nucleation sites are increased, three-dimensional diffusion growth is induced, (002) crystal face dominated compact zinc deposition is realized, and polarization voltage is remarkably reduced. And the 3-(1, 2, 4-triazole-1-yl) methyl benzoate preferentially reacts with water to passivate the reaction activity of the water and further inhibit the side reaction in the aqueous electrolyte. By virtue of the synergistic mechanism, the electrolyte endows the aqueous zinc ion battery with high specific capacity and excellent cycling stability.

The present application relates to a kind of preparation methods of 3,4-dihydroxy-5-methoxybenzoic acid methyl ester, with gallic acid as raw material, it is reacted with trimethyl orthoformate or trimethyl orthoacetate, trimethyl orthoformate or trimethyl orthoacetate can realize the protection of adjacent diphenol hydroxyl on one hand, on the other hand, carboxyl esterification and 5-hydroxyl are methylated, form the methyl ester of 5-phenolic hydroxyl methylation and 3,4-orthoester protection benzoic acid shown in formula 1a or formula 1b, further by acidic solution treatment, deprotection is carried out, and the target product 3,4-dihydroxy-5-methoxybenzoic acid methyl ester is prepared.The preparation method is mild in reaction condition, process is simple, easy to operate, product yield and purity are high, solve the wastewater problem in borax protection method, and avoid using toxic dimethyl sulfate for methylation, process condition is simple, easy to operate, convenient for industrialization, with very high application value.