18 results about "Crotonic acid" patented technology

A composite current collector, a preparation method therefor, an electrode, and a secondary battery. The composite current collector comprises: a polymer base film and composite layers provided on two sides of the polymer base film. Each composite layer comprises: a modified layer arranged on the polymer base film, and a metal layer arranged on the surface of the modified layer, wherein the material of the modified layer is a polymer formed by in-situ graft polymerization of a polymerized monomer and / or oligomer on the surface of the polymer base film; and the polymerized monomer comprises an acrylamide monomer, a crotonic acid monomer, or a combination thereof.

The application belongs to the technical field of biochemical synthesis, and particularly relates to a high stereoselectivity amino-cleaving enzyme and a synthesis method of (S)-3-aminobutyronitrile and a salt thereof. The high stereoselectivity amino-cleaving enzyme is selected from the amino acid sequences shown in SEQ ID NO. 6-8. The synthesis method comprises: performing an enzyme catalytic reaction on crotonic acid in the presence of the high stereoselectivity amino-cleaving enzyme to obtain (S)-3-aminobutyric acid with a chiral purity e.e. of 99.5% or more; reacting (S)-3-aminobutyric acid with di-tert-butyl dicarbonate, and then reacting with ammonium bicarbonate, and further performing dehydration and deprotection to obtain (S)-3-aminobutyronitrile hydrochloride. The application combines chemical method and enzyme method, avoids the use of highly toxic substances, is safe and efficient, improves the economic benefits in the industrialization process, and the overall route reflects the value of green chemical synthesis.

The application discloses a preparation method of butyl acrylate. The butyl acrylate is prepared through esterification reaction of raw materials of acrylic acid and n-butanol. The acrylic acid includes acryloyloxypropionic acid, maleic acid and crotonic acid. The mass ratio of the acryloyloxypropionic acid to the maleic acid is 1:0.01-1, and the mass ratio of the crotonic acid to the acryloyloxypropionic acid is 1:5-500. The content of key impurities in the acrylic acid is ensured to be in a specific ratio, and the crude acrylic acid is directly used as a raw material for butyl acrylate production after removal of light components, so that the production cost of the butyl acrylate is greatly reduced, and raw material consumption and energy consumption are reduced. The application is a green and efficient production process.

This application provides a perovskite solar cell, a method for manufacturing the same, and a solar module, wherein the perovskite solar cell includes a perovskite light-absorbing layer comprising a perovskite material and a complexing agent, the complexing agent comprising one or more of hydroxycarboxylic acid-based complexing agents, organic phosphonic acid-based complexing agents, polyacrylic acid-based complexing agents, and polycrotonic acid-based complexing agents. The perovskite solar cell, a method for manufacturing the same, and a solar module of this application passivate defects, reduce ion movement of the perovskite, decrease the decomposition of the perovskite light-absorbing layer and the deactivation of each functional layer, and improve the efficiency and stability of the device.

This invention provides an enzymatic method for the preparation of R-3-aminobutyric acid (GABA), belonging to the field of biochemistry. Using crotonic acid as a substrate and a recombinant aspartate enzyme mutant as a biocatalyst, an enzymatic reaction is carried out under suitable temperature and pH control to efficiently and stereoselectively prepare the product R-3-aminobutyric acid. This method utilizes *E. coli* as a host for heterologous expression of recombinant aspartate enzyme. The whole cells of the expression host are used as crude enzyme for the enzymatic reaction. After extraction and purification, high-purity R-3-aminobutyric acid is obtained, with a conversion rate exceeding 99% and a product purity >99% and >99.9% ee. This method features high conversion and high yield, and is easily industrialized.

The invention discloses a synthesis method of an enamine compound and a recycling method of raw materials, and belongs to the technical field of pesticide chemical industry. According to the method, ethyl trifluoroacetoacetate is used as a raw material, substituted phenylacetic acid ammonium is used as an amination reagent, 3-amino-4, 4, 4-ethyl trifluorocrotonate is prepared through a reflux water diversion reaction in a specific organic solvent, and efficient recovery of the amination reagent is achieved through ammonia water mediation. Water generated by reaction is removed in time through reflux water diversion, raw material ester hydrolysis is effectively inhibited, and the yield of enamine is larger than or equal to 98%; and in the recovery process, sublimation is avoided by utilizing the high-boiling-point characteristic of substituted phenylammonium acetate, the problem of condenser blockage is solved, the recovery yield is greater than or equal to 99%, direct application can be realized, the cost is remarkably reduced, and green chemical requirements are met.

The purpose of the present invention is to provide a decomposable cross-linking agent which has high solubility in a solvent and is not susceptible to poor curing. The present invention relates to a degradable cross-linking agent which is represented by formula (1) (in formula (1), n > = 0, k > = 0, and m > = 0. R1, R2 and R3 independently comprise a hydroxyl group, an amino group, a hydrazide group, a thiol group, an isopentenyl group, a crotonamide group, a crotonate group, a carboxylic acid, an anhydride group, a vinyl group, an allyl group, an acrylate group, a methacrylate group, an acrylamide group, a methacrylamide group, a hydroxysilyl group, an epoxy group, an oxetanyl group, an oxazolinyl group and an isocyanate group at a terminal; and one or more reactive functional groups selected from the group consisting of a carbodiimide group, a hydroxymethyl group, a silanol group, and an alkoxysilyl group, and contains a single bond, a group containing a siloxane structure, or a hydrocarbon group optionally having a substituent or a heteroatom. (In the formula, A1 to A8 are each independently a carbonyl group or a single bond, at least one of A1 and A2 is a carbonyl group, at least one of A3 and A4 is a carbonyl group, at least one of A5 and A6 is a carbonyl group, and at least one of A7 and A8 is a carbonyl group. Each Z independently represents a group containing a siloxane structure, or a hydrocarbon group optionally having a heteroatom. ) (In the formula, (a) when n = 0, R1 and R2 are different from each other; (b) when n > = 1 and k = 0, (b-1) R1 is different from R2, and / or (b-2) Z comprising at least one asymmetric structure; (c) when n > = 1 and k > = 1, (c-1) at least one of R1, R2, and R3 is different, and / or (c-2) comprises at least one Z having an asymmetric structure.

The application discloses an aldehyde oxidase mutant and application thereof in tiglic acid synthesis, and belongs to the technical field of biosynthesis. The mutant is obtained by double-mutation of alanine at the 80th position and lysine at the 143th position of the amino acid sequence shown in SEQ ID NO. 2. The aldehyde oxidase mutant has significantly improved enzyme activity (80.5 U / L) compared with wild-type aldehyde oxidase (20 U / L). The aldehyde oxidase mutant catalyzes tiglic aldehyde hydrolysis to produce tiglic acid, and the conversion rate of raw materials can reach 96%, so the aldehyde oxidase mutant has a good industrial application prospect.

The invention discloses a method for determining organic acids in main stream smoke of cigarettes, which is used for determining 16 organic acids in the main stream smoke of the cigarettes. The 16 organic acids are respectively crotonic acid, tiglic acid, trans-2-methyl-crotonic acid, levulinic acid, benzoic acid, furoic acid, lauric acid, tetradecanoic acid, cinnamic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, nonadecanoic acid, linolenic acid and arachidic acid; the method comprises the following steps: capturing flue gas, oscillating and extracting, preparing a standard solution, preparing a solution to be detected, qualitatively analyzing and quantitatively analyzing. By adopting the method, the 16 organic acids in the mainstream smoke of the cigarette can be accurately determined.

The invention relates to a method for fixing a care and / or cosmetic product for a keratin material, such as the skin, comprising at least the following steps: 1) applying a first layer of a care and / or cosmetic composition (B) to the surface of the keratin material; 2) applying a second immobilizing layer to the thus-formed first layer by spraying with an aerosol device containing a composition (A) comprising, in particular in a physiologically acceptable medium: (a) at least one anionic immobilizing polymer of crotonic acid copolymer type; (b) at least one amphoteric fixed polymer selected from polymers comprising units derived from i) at least one monomer selected from acrylamide or methacrylamide substituted with an alkyl group on the nitrogen atom, ii) at least one acidic comonomer containing one or more reactive carboxyl groups, and iii) at least one basic comonomer; (c) at least one C2-C4 monohydric alcohol; (d) at least one plasticizer; and (e) at least one propellant.

The utility model provides a water diversion device for ethyl trifluorocrotonate production, and relates to the technical field of ethyl trifluorocrotonate production, the water diversion device comprises a water segregator main pipe, the outer side of the water segregator main pipe is provided with a supporting assembly, the supporting assembly comprises a limiting ring, a rotating cylinder, a mounting groove piece, a threaded cylinder, a threaded butt joint and a threaded rod, the limiting rings are symmetrically installed on the outer side of the water segregator main pipe, the rotating cylinder is movably installed on the outer side of the water segregator main pipe and located between the limiting rings, the installation groove piece is installed on one side of the rotating cylinder, and the threaded butt joint is installed at one end of the threaded cylinder. The threaded cylinder is connected with the mounting groove piece through a threaded butt joint and is mounted on one side of the rotating cylinder, and a threaded rod is mounted in the threaded cylinder in a threaded mode. According to the utility model, the threaded cylinder is connected with the rotating cylinder, so that the supporting component can support the water segregator, and the situation that the water segregator is unstable in connection with a reaction kettle and a condenser, so that the water segregator falls off during use and the use is influenced is prevented.

The application belongs to the technical field of organic synthesis and particularly relates to a synthesis method of tert-butyl 4-triethoxysilyl butyrate. The synthesis method is that tiglic acid is reacted with sulfoxide chloride, then reacted with tert-butyl alcohol to obtain tert-butyl but-3-enoate, and finally, tert-butyl but-3-enoate is reacted with triethoxysilane with platinum dioxide as a catalyst to obtain tert-butyl 4-triethoxysilyl butyrate. The synthesis method is simple in operation, low in raw material price, low in catalyst consumption, high in yield and high in purity, and is suitable for industrial production.

The invention relates to the technical field of injection molding demolding master batches, in particular to a polyester transparent injection molding demolding master batch as well as a preparation method and application thereof. The catalyst comprises the following components in percentage by mass: 85-97% of a carrier and 3-15% of a lubricant, the lubricant is prepared from zinc crotonate, zinc cinnamate and octadecanol stearate according to the mass ratio of (2 to 6): (2 to 6): (1 to 4). And through the lubricant with a specific component ratio, the fluidity and demolding property of the polyester product are improved, and the haze is reduced.

This invention relates to a selenium-iron-copper composite catalyst material, its preparation method, and its applications in the field of materials chemistry. The catalyst uses ferric oxide as a matrix, with selenium powder, iron powder, and copper powder added as active components, and polyol and carboxylic acid as auxiliary agents. The process involves premixing, calcination, and pulverization. The selenium powder content is 1-7 wt% of ferric oxide, the iron powder content is 2-10 wt%, and the copper powder content is 0.5-1.5 wt%. The preferred polyol is glycerol, and the preferred carboxylic acid is crotonic acid. The calcination temperature is 400-800℃. In catalytic testing, under room temperature and air bubbling conditions, this catalyst can achieve a degradation rate of over 90% for tetracycline hydrochloride within one hour. This invention features a simple preparation method, low cost, high catalytic activity, mild operating conditions, and efficient degradation of tetracycline in water, making it suitable for antibiotic wastewater treatment.

A method for preparing pharmaceutical-grade sodium 3-hydroxybutyrate, the method comprising the following steps: A, hydrolyzing methyl(ethyl) 3-hydroxybutyrate at 55°C to 60°C by using sodium hydroxide, so as to obtain a sodium 3-hydroxybutyrate crude product; B, dissolving the crude product obtained in step A with methanol and water, adding an addition catalyst thereto, and maintaining the temperature at 20°C-30°C for reaction, so as to obtain an addition reaction product; and C, filtering the reaction liquid from step B, subjecting the mother liquid to reduced pressure distillation, and removing methanol by means of evaporation until the mother liquid is thick; and adding acetone thereto for crystallization, and cooling, filtering and drying the mixture, so as to obtain a finished product. The content of crotonic acid in the sodium 3-hydroxybutyrate prepared by means of the method is not higher than 16 ppm, and the content of sodium 3-hydroxybutyrate reaches 99.5% or above.

A method for preparing an intermediate of a uracil compound containing isooxazoline includes the steps of: making 3-amino-4,4,4-trifluorocrotonic acid methyl ester react with substituted aryl carbamate; in a reaction process, continuously evaporating water and byproduct alcohol in the system; and conducting processing to obtain the intermediate of the uracil compound containing isooxazoline. Using this method the selectivity of the reaction and the utilization rate of raw materials are improved; the hydrolysis products, impurities and tar are reduced; the reaction time is greatly shortened; and the productivity is improved. After one recrystallization of crude products, an intermediate product with purity of more than 97% can be obtained, and quantitative yield can be more than 85%.

The preparation method of the skin-care makeup-fixing spray comprises the following steps: S1, preparing alkali liquor; s2, first-step neutralization and dissolution; s3, neutralizing and dissolving in the second step; and S4, cooling and mixing. A VA / crotonic acid (ester) / neodecanoic acid vinyl ester copolymer and an octyl acrylamide / acrylic acid (ester) / butylaminoethyl methacrylate copolymer are selected as composite film-forming agents, and a specific alkaline agent neutralization and step-by-step dissolution process is matched, so that the make-up fixing spray which is light in texture, free of white chips, durable in make-up and comfortable to use is prepared; the composite film-forming agent solves the problems of high cost, sticky and greasy skin feeling, slow drying speed and easy acne suffocation caused by high additive amount of a film-forming agent of an existing make-up product, and the problems of blocking, darkness, poor portability and the like of make-up powder, can realize long-acting make-up under the condition of low additive amount, reduces the formula cost, has the characteristics of water resistance, sweat resistance, air permeability and comfort, and is suitable for popularization and application. The composition is suitable for various skin types, and has remarkable economic benefits and practical values.

The application belongs to the technical field of molecular biology, and particularly relates to an antigen-antibody complex dissociation agent and a fluorescent antibody elution method. The antigen-antibody complex dissociation agent comprises N,N-dimethylformamide, crotonic acid, phenylhydrazine and inorganic salt, and the working pH of the dissociation agent is 1-5. In the above components, the low pH value and the certain inorganic salt concentration are helpful to destroy the binding force between the antigen and the antibody, and DMF and crotonic acid both have certain antibody elution efficiency, and phenylhydrazine as a chelating agent is also helpful to the antibody elution. Through the combination of the above components, the effective dissociation of the antigen-antibody complex is realized.