10298 results about "Alcohol" patented technology

The invention discloses a method for constructing a true and adulterated wine discrimination model, and particularly relates to the technical field of wine detection. The method comprises the following steps: extracting component data, a spectrum curve, smell fingerprints and texture information of wine liquid through nondestructive testing, carrying out standardization processing and feature fusion on multi-modal data, extracting distribution similarity features and domain offset robustness features, constructing a comprehensive feature vector, and evaluating a generalization ability value of a true and adulterated wine discrimination model by utilizing a machine learning model; aiming at a low generalization ability model, adopting a transfer learning method to carry out multi-stage training and optimization, and evaluating the detection accuracy of the model on unseen brands and batches in combination with cross validation; and finally, inputting the multi-modal characteristics of the to-be-detected wine on the optimized model, and outputting a true and false wine judgment result and a confidence score. According to the invention, the stability and adaptability of the true and adulterated wine discrimination model can be significantly improved, and it is ensured that the method has high accuracy, high generalization ability and wide market applicability in detection of wine of different brands and batches.

The invention discloses a nylon elastomer preparation method, which comprises: S1, weighing preparation raw materials of a nylon elastomer according to a feeding ratio, and weighing the preparation raw materials by using a weighing device, the nylon elastomer is prepared from the following raw materials: tridecane diamine, tridecane dibasic acid, dodecanediamine, dodecanedioic acid, undecanediamine, undecanedioic acid, decamethylene diamine, sebacic acid, pentamethylene diamine, glutaric acid, hexamethylenediamine, adipic acid, caprolactam, and one or more of polyether amine and polyether alcohol; and S2, feeding the preparation raw materials weighed in the step S1. In the preparation process of the nylon elastomer, the nylon elastomer with different melting points, different crystallization temperatures, different strengths and different elongation at break is produced by adopting a multi-component copolymerization mode and adjusting the types and the molecular weights of polyether amine and polyether alcohol by adjusting the types and the proportions of binary acid and diamine, so that the nylon elastomer is suitable for different use environments; the utilization rate is improved.

The invention discloses an easy-to-apply single-component polyurethane waterproof coating and a preparation method thereof, and belongs to the technical field of waterproof coatings. The easy-to-apply single-component polyurethane waterproof coating disclosed by the invention is prepared from the following raw materials: polyol, a plasticizer, a solid filler, isocyanate, a catalyst and a solvent, the polyol comprises polyether glycol and polyether triol; the plasticizer comprises acetyl tributyl citrate; the catalyst comprises a bismuth neodecanoate catalyst and a dimorpholine diethyl ether catalyst. According to the easy-to-apply single-component polyurethane waterproof coating disclosed by the invention, acetyl tributyl citrate is used for replacing traditional plasticizer chlorinated paraffin, and a bismuth neodecanoate catalyst and a dimorpholine diethyl ether (DMDEE) catalyst are compounded, so that the viscosity of the waterproof coating is effectively reduced, and construction is facilitated; meanwhile, the drying speed of the waterproof coating is increased.

The invention discloses a deep eutectic solvent / bimetal organic framework co-catalyzed straw polyol as well as a preparation method and application thereof, the straw polyol is prepared by the following method: uniformly mixing straw powder, small molecular alcohol, an acid catalyst and a deep eutectic solvent in a nitrogen atmosphere, and reacting to obtain a reaction product; and adding a bimetal organic framework catalyst into the reaction product, and reacting to obtain the straw polyol. A green, natural and pollution-free eutectic solvent catalytic liquefaction technology is adopted, lignin and hemicellulose can be dissolved, the cross-linking effect between lignin and hemicellulose and cellulose is reduced, the crystalline structure of cellulose can be destroyed, the available surface area is increased, the contact with a liquefying agent is enhanced, the conversion efficiency is improved, and the residue rate is reduced; the bimetallic organic framework catalyst is added in the middle and later periods of the reaction, aldehydes, ketones and acid and ester substances can be reduced and upgraded into alcohols, the hydroxyl value of the liquefied polyol is greatly increased, and the film-forming crosslinking degree is improved.

The invention relates to the technical field of oil-displacing agents, and particularly discloses a targeted nano oil-displacing agent and a preparation method thereof. A preparation method of a targeted nano oil displacement agent comprises the following steps: S1, dispersing 10-30 parts by mass of silanized inorganic nanoparticles in an alcoholic solution, adding 5-12 parts by mass of a functional monomer, 8-20 parts by mass of a hydrophilic monomer and 5-15 parts by mass of a hydrophobic monomer in an inert atmosphere, uniformly mixing, heating to 75-85 DEG C, adding an initiator, carrying out a constant temperature reaction for 4-6 h, and cooling to obtain a pre-grafted nanoparticle dispersion liquid; s2, mixing the pre-grafted nanoparticle dispersion liquid with a composite surfactant, adjusting the pH value to 6.5-7.5, and mixing at 30-40 DEG C for 22-26 hours to obtain the targeted nano oil displacement agent, the targeting type nano oil displacement agent prepared by the invention can still keep excellent dispersion stability and ultralow interfacial tension under the condition of a high-salt oil reservoir, so that the oil displacement efficiency is remarkably improved.

A method for efficiently and safely cleaning an apparatus for tin compound and a highly purified tin compound apparatus are provided. A cleaning method for an apparatus that has been in contact with a tin compound having formula (1) below includes at least steps (A) to (C), in which step (B) is performed after step (A), and step (C) is performed after step (B):(A) a step of cleaning the apparatus with a non-protic solvent,(B) a step of cleaning the apparatus with alcohol, and(C) a step of cleaning the apparatus with ultrapure water having a resistivity value of 17 MΩ·cm at 25° C.RpSnXm  (1)In formula (1), R is a hydrocarbon group, p is an integer from 1 to 3, X is a hydrolyzable substituent, and m=4−p.

The invention relates to a preparation method and application of an artificially synthesized exosome with an anti-aging effect, and belongs to the technical field of cosmetics and biology. The artificially synthesized exosome is prepared from hydrogenated lecithin, phytosphingosine, cholesterol, ceramide, squalane, sodium stearoyl glutamate, a surface modification structure, polyol, an active component and water. The preparation method comprises the steps of preparation of an alcohol phase, preparation of a water phase, preparation of a mixed solution and high-pressure homogenization treatment. The artificially synthesized exosome prepared by the preparation method provided by the invention is good in stability and high in anti-aging activity.

The invention provides an anti-aging flame-retardant epoxy resin coating and a preparation process thereof, and belongs to the technical field of coating preparation. The preparation process comprises the following steps: preparing the flame-retardant additive; preparing a coated modified black phosphorus nanosheet; preparing modified hollow glass beads; preparing the epoxy resin coating. The preparation method comprises the following steps: dissolving 3, 4-dihydroxy benzaldehyde and 2-amino-4-methylphenol in absolute ethyl alcohol, carrying out a heating reflux reaction, carrying out dehydration condensation on an aldehyde group in the 3, 4-dihydroxy benzaldehyde and an amino group in the 2-amino-4-methylphenol to generate an imine bond-containing intermediate, respectively dissolving the intermediate and phosphonitrilic chloride trimer, and carrying out a reaction to obtain the phosphonitrilic chloride trimer. The preparation method comprises the following steps: firstly, adding phosphonitrilic chloride into an intermediate, then mixing for reaction, enabling phenolic hydroxyl groups in the intermediate and phosphonitrilic chloride trimer to be subjected to nucleophilic substitution reaction to generate the flame-retardant additive containing phosphorus and a Schiff base structure, and the flame-retardant additive has relatively good compatibility with an epoxy resin matrix, is not easy to separate out and can effectively improve the flame-retardant property of the epoxy resin coating.

The invention discloses a high-performance carbonyl reductase mutant and application thereof in synthesis of a series of chiral alcohols. The high-performance carbonyl reductase mutant is obtained by performing the following mutations on an amino acid sequence as shown in SEQ ID NO.2: the 69th alanine mutates into any one of lysine, leucine, aspartic acid or asparagine, and the 69th alanine mutates into any one of lysine, leucine, aspartic acid or asparagine; and / or the 100th glycine is mutated into any one of glutamic acid, serine, lysine or asparagine. Compared with a wild type enzyme, the thermal stability and the catalytic activity of the obtained mutant are remarkably improved, particularly, single point mutants Mut-A69N, Mut-G100E and Mut-G100N and a combined mutant Mut-A69N-G100N show excellent relative enzyme activity, thermal stability and substrate tolerance. The mutant has high catalytic activity and stability to various chiral alcohols, and the contradiction that the traditional carbonyl reductase is easy to inactivate at high temperature and the catalytic efficiency is difficult to achieve at the same time is solved. The invention provides an efficient and stable enzyme catalysis tool for green biological preparation of chiral drug intermediates.

The invention provides a preparation method of a waterproof flame-retardant multifunctional fabric, and belongs to the technical field of functional textiles. The preparation method comprises the following steps: heating dihydric alcohol until the dihydric alcohol is completely melted, adding diisocyanate, a flame retardant and a catalyst, reacting to obtain a polyurethane prepolymer, adding a chain extender for chain extension, then adding an end-capping reagent for end capping, cooling, adding an emulsifier to obtain a waterproof flame retardant emulsion, adding water to form a finishing agent, soaking a polyacrylonitrile pre-oxidized fiber fabric in the finishing agent for treatment, and drying to obtain the waterproof flame retardant fabric. And pre-drying and baking to obtain the multifunctional fabric. Polyhydric alcohol with a long alkane chain is adopted to carry out chain extension on a polyurethane prepolymer, the obtained waterproof agent has good film-forming property, can be firmly fixed on the surface of a fiber without the help of a cross-linking agent or an adhesive during application, and endows a modified textile with excellent washing fastness.

The invention relates to the technical field of polyurethane coatings, in particular to a hydrophobic flame-retardant polyurethane coating and a preparation method thereof. The preparation method comprises the following steps: firstly, taking 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and methallyl alcohol as raw materials, and reacting to obtain hydroxyl grafted phosphaphenanthrene; taking 1, 1, 3, 3-tetramethyldisiloxane and methallyl alcohol as raw materials, and reacting according to a molar ratio of 1: 2 to obtain dihydroxy siloxane; then cyanuric chloride, hydroxyl grafted phosphaphenanthrene and dihydroxyl siloxane react according to the molar ratio of 1: 1: (1.5-1.8), and the dihydroxyl-terminated silicon-containing flame retardant is obtained. The preparation method comprises the following steps: mixing a dihydroxyl-terminated silicon-containing flame retardant with polytetrahydrofuran ether glycol to serve as a soft segment, and reacting with isocyanate to obtain a hydrophobic flame-retardant polyurethane emulsion; mixing the hydrophobic flame-retardant polyurethane emulsion, an anti-aging agent, an ultraviolet light absorber, a defoaming agent, kaolin, nano silicon dioxide and talcum powder to obtain the hydrophobic flame-retardant polyurethane coating.

The invention discloses a high-temperature-resistant power tube and a production process thereof, and belongs to the technical field of power tube preparation. The high-temperature-resistant electric power tube is prepared from, by weight, 60-80 parts of a high-temperature-resistant base material, 10-30 parts of carbon fibers and 1-5 parts of a modified anti-aging agent, the high-temperature-resistant base material is prepared from 2, 3, 4-trifluorobenzaldehyde, malonic acid, oxynaphthalene propionic acid, trifluoroacetic anhydride and 2, 2-bis [4-(4-aminophenoxy) phenyl] propane, and the modified anti-aging agent is prepared from 2, 3, 4-trifluorobenzaldehyde, malonic acid, oxynaphthalene propionic acid, trifluoroacetic anhydride and 2, 2-bis [4-(4-aminophenoxy) phenyl] propane. The modified anti-aging agent is prepared from absolute ethyl alcohol, paeonol, sodium hydroxide and 2-methoxybenzaldehyde. The power tube prepared by the method has excellent high temperature resistance, mechanical property and aging resistance.

The invention discloses production of terpenoids and a strain, and belongs to the technical field of bioengineering. The serratia marcescens engineering bacteria for producing the semi-terpenoids or monoterpenoids are constructed, and can be used for producing linalool, isoprene, isopentenol, 1, 3, 4-triterpenes and 1, 3, 4-triterpenes. The composition is prepared from 1, 8-cineole, alpha-pinene, pinene, gamma-terpinene, geraniol, (+)-limonene, (-)-limonene, myrcene, beta-ocimene, sabinene, (-)-alpha-bisabolol, (-)-alpha-bisabolol, longifolene, wallenenes, beta-elemene, farnesene, patchouli alcohol, acyclic terpene and alpha-santalene. In a 30L fermentation tank, the yield of linalool produced by the serratia engineering bacteria is 40.72 g.L <-1 >.

The invention provides a synthesis method of nanoscale lithium sulfide, and relates to the technical field of lithium sulfide synthesis. The synthesis method provided by the invention comprises the following steps: stirring and dissolving a lithium sulfide raw material in an alcohol solvent, and separating to obtain a lithium sulfide alcohol solution; evaporating, crystallizing and drying the lithium sulfide alcohol solution to obtain lithium sulfide crystals; and mixing the lithium sulfide crystals with a sulfur source, and firing at 550-850 DEG C to obtain the nanoscale lithium sulfide. The nanoscale lithium sulfide is directly synthesized in one step through a solid-phase sintering method, the operation method is simple, the cost is low, and large-scale industrial production can be achieved.

The invention relates to a manufacturing method of high-density aviation fuel, in particular to an aviation fuel mixture based on monoterpenoids and a preparation method of the aviation fuel mixture. Comprising monoterpenoids, polyhydric alcohols and a catalyst which serve as raw materials, and the mass ratio of the raw materials to the polyhydric alcohols is 1: 1. The conversion rate is high, the treatment steps are reduced, the thermal stability and combustion gravimetric heat of the product are improved, and the method is suitable for preparing aviation fuel with high density, low viscosity and low-temperature performance; cyclization and hydrogenation are carried out through a one-pot method, a reaction container does not need to be transferred, and the operation is simple; according to the polyol solvent system, cyclization of the monoterpenoids becomes easier due to participation of polyol, and the conversion rate is increased; according to the dual-catalyst system, a combination of an acidic catalyst and a heterogeneous hydrogenation catalyst is used in a reaction container, so that efficient dehydration and hydrogenation reactions are ensured; the aromatic compound content in the fuel can be controlled by adjusting hydrogenation conditions.

The invention discloses a large-aperture aluminum oxide loaded copper-based catalyst as well as preparation and application thereof. The large-aperture alumina-loaded copper-based catalyst comprises a large-aperture alumina carrier, and copper oxide and lanthanum oxide loaded on the surface of the large-aperture alumina carrier, the large-aperture alumina-loaded copper-based catalyst is granular, the specific surface area is 250-500 m < 2 > / g, the pore volume is 1.0-2.0 cm < 3 > / g, the average aperture is 16-30 nm, and the pore diameter of the large-aperture alumina-loaded copper-based catalyst is 20-30 nm. The large-aperture alumina supported copper-based catalyst comprises the following components in percentage by mass: 79%-98.9% of a large-aperture alumina carrier, 0.1%-6% of copper oxide and 1%-15% of lanthanum oxide. The large-aperture aluminum oxide loaded copper-based catalyst disclosed by the invention shows relatively high catalytic activity and higher alcohol selectivity in a reaction for preparing higher alcohol from ethanol, and particularly has relatively high C6-C10 fatty alcohol selectivity.

The invention relates to a solvent-resistant medical connecting line sheath material and a preparation method thereof, and belongs to the technical field of high polymer materials. The sheath material is prepared from the following components: 38 to 44 weight percent of passivated toughening agent, 1.5 to 1.8 weight percent of heat stabilizer, 0.7 to 0.9 weight percent of lubricant, 0.12 to 0.15 weight percent of antioxidant and the balance of PVC (Polyvinyl Chloride) resin, the passivated toughening agent is prepared by the following steps: carrying out amine ester exchange reaction on 4-hydroxybutylamine and dimethyl difluoromalonate, introducing an alcohol-terminated hydroxyl group, carrying out substitution with dichloromethylvinylsilane to form a fluorine-containing chain compound, and finally carrying out double bond addition on methyl thioglycolate and a side chain; the passivation toughening agent is compatibilized through branched chain methyl ester and dynamically coordinated with a PVC molecular chain through a side chain thioether group, weakens the acting force between PVC chains, plays a good toughening role, inhibits dissolution through physical crosslinking, shields and passivates the PVC molecular chain, and relieves swelling of PVC in a solvent.

The invention discloses a nano material modified alcohol amine grinding aid as well as a preparation method and application thereof, and the preparation method comprises the following steps: firstly, carrying out esterification reaction on alcohol amine and an acid small monomer containing double bonds to generate an esterification product; then, carrying out bulk polymerization on the esterification product and a silane coupling agent KH-570; and finally, combining the bulk polymerization product with the nano-material through a dehydration reaction of a silane coupling agent and hydroxyl on the surface of the nano-material to form the nano-material modified alcohol amine grinding aid. According to the invention, the nano material is directly grafted into the alcohol amine, so that the dispersity of the nano material in the cement grinding process can be effectively optimized, the friction force and energy consumption among cement particles can be reduced, the efficiency and stability of the cement production process can be improved, and the strength and durability of the cement product are improved.

The invention belongs to the technical field of chemical production, and particularly relates to an efficient energy-saving refining system for producing cyclohexanone through dehydrogenation, which comprises an alcohol tower, a dehydrogenation heat exchanger, a dehydrogenation reactor, an alcohol tower feeding heat exchanger, a dehydrating tower, a light tower I, a light tower II, a ketone tower and an alcohol recovery tower which are connected in sequence, a middle feeding port of the alcohol tower is communicated with a tube pass discharging port of the alcohol tower feeding heat exchanger, a top discharging port of the alcohol tower is communicated with a tube pass feeding port of the dehydrogenation heat exchanger, a bottom discharging port of the alcohol tower is communicated with a middle feeding port of the alcohol recovery tower, and an alcohol ketone drying tower is additionally arranged between the alcohol tower feeding heat exchanger and the dehydration tower. A feed port of the alcohol ketone drying tower is communicated with a shell pass discharge port of the alcohol tower feed heat exchanger, and a liquid phase discharge port of the alcohol ketone drying tower is communicated with an upper feed port of the dehydrating tower. The alcohol tower adopts a process that raw materials directly enter the tower top, tower top reflux is cancelled, steam consumption is reduced, and the purpose of saving energy is achieved.

The invention discloses a chlorine-resistant and acid-resistant composite nanofiltration membrane and a preparation method thereof, and belongs to the technical field of membrane separation. A polyhydric alcohol or / phenol compound monomer containing no less than two hydroxyl groups is subjected to interfacial polymerization with cyanuric chloride, so that a relatively loose network structure can be formed, and selective separation of dye and salt is realized. As a hydrochloric acid (HCl) byproduct can be generated in the reaction process, an alkaline compound is added as an acid-binding agent to neutralize HCl and promote the interfacial polymerization reaction, the formed composite nanofiltration membrane structure does not contain amino groups and polyamide bonds sensitive to active chlorine, the reaction sites of the active chlorine are reduced, and the chlorine-resistant stability of the membrane is good. Meanwhile, the polymer film contains a triazine ring structure, and a formed ether bond has good chemical stability, so that the acid-resistant stability of the film is good. The prepared composite nanofiltration membrane has good nanofiltration separation performance, shows good chlorine-resistant and acid-resistant stability, and can be used for separation of dyes / salts.

The invention provides a preparation method for improving the performance and carbon sequestration rate of a steel slag carbonized product, and the preparation method specifically comprises the following steps: (1) weighing the following raw materials in percentage by mass: 50-100 parts of steel slag powder, 13-17 parts of deionized water and 1 part of alcohol amine; (2) mixing the weighed deionized water with alcohol amine to obtain an alcohol amine solution, stirring the alcohol amine solution in a magnetic stirrer, continuously introducing CO2 gas with the concentration of 99.9% to carbonate the alcohol amine solution, and controlling the gas introduction time to be 2 hours; (3) doping an alkylol amine solution subjected to carbonation treatment into the weighed steel slag powder, and uniformly stirring by using a neat paste stirrer; (4) pressing the steel slag mixture into steel slag product briquettes in a compression molding manner; and (5) putting the briquette into a carbonization kettle, and introducing CO2 gas with the purity of 99.9% to prepare a steel slag carbonized product. The problem that the interior of the steel slag carbonized product cannot be fully carbonated and maintained is solved, so that the comprehensive performance and the carbon sequestration rate of the steel slag carbonized product are remarkably improved.

The invention discloses a method for regulating the length-diameter ratio of calcium sulfate hemihydrate whiskers prepared from ardealite, and belongs to the field of ardealite resource utilization. According to the invention, carbohydrates, alcohols and other substances containing hydroxyl groups are used as the crystal modifier, and the calcium sulfate hemihydrate whisker is prepared by regulating and controlling phosphogypsum through a normal-pressure hydrothermal method, so that the length-diameter ratio of the whisker is regulated and controlled within a certain range. The method solves the problems that the length-diameter ratio of the whisker in the calcium sulfate hemihydrate whisker product prepared from ardealite is not uniform and cannot be regulated and controlled, the preparation process is tedious, the corrosivity is strong due to excessive salt solution in the reaction system, and the waste liquid has great harm to the environment, and has a good application prospect.

The invention provides a chiral resolution method and application of a 3-aryl substituted glutaric acid monoester compound, and the method comprises the following steps: taking a substance as shown in a formula I as a starting raw material, and carrying out alcoholysis to obtain a racemic intermediate as shown in a formula IV; and splitting the intermediate shown in the formula IV, and then dissociating to obtain the compound shown in the formula III, which has a single spatial configuration and an ee value of more than 99%. A cyclic anhydride substrate with a symmetrical structure is used and reacts with alcohol to obtain racemic 3-aryl substituted glutaric acid monoester, a target configuration with high chiral purity is obtained by screening some resolution reagents and solvents and performing salifying resolution on the 3-aryl substituted glutaric acid monoester, the operation is simple, the resolution reagents are easily available in the market and can be recycled, and the method is suitable for industrial production. The method has the advantages that an expensive chiral catalyst or a harsh enzyme catalysis condition is avoided, the reaction cost is reduced, amplified production is facilitated, the ee value of a target configuration can be increased to 99% or above, and the method is an economic and environment-friendly technical route which is simple in post-treatment and convenient for amplified production.

The invention discloses a method for synthesizing deuterated olefin under catalysis of a palladium membrane by taking D2O as a deuterium source, and belongs to the technical field of synthesis of deuterated olefin building blocks. According to the method, a three-chamber electrolytic tank separated by a palladium membrane and an ion exchange membrane is used as a reactor, the palladium membrane is used as a working electrode, an electrolyte deuterium aqueous solution is used as an electrolyte, deuterium water is electrolyzed through a constant-potential electrolysis method, and formed active deuterium is transmitted to one side of an organic reaction taking absolute ethyl alcohol or cyclohexane as an organic solvent; and catalyzing an alkyne compound by using a palladium membrane modified by sodium thiophenol to perform reduction deuterization so as to synthesize a deuterated olefin compound with high selectivity, and further synthesizing a corresponding deuterated drug. The invention provides a green, efficient, high-universality and low-cost amplification synthesis method for synthesizing a deuterated olefin building block containing a functional group easy to reduce and hydrolyze, and the method has a wide application prospect.

The invention discloses purified gastrodia elata polysaccharide as well as a preparation method and application thereof, and belongs to the technical field of extraction of active ingredients of gastrodia elata. The method comprises the following steps: (1) adding an alcoholic solution into gastrodia elata powder for reflux extraction, and collecting filter residues; (2) dissolving the filter residues in pure water, and performing ultrasonic extraction to obtain filtrate; (3) adding absolute ethyl alcohol into the filtrate for low-temperature alcohol precipitation to obtain crude gastrodia elata polysaccharide; (4) performing deproteinization treatment on the gastrodia elata crude polysaccharide; (5) purifying by using macroporous resin; (6) dialyzing the crude polysaccharide purified liquid in pure water; (7) purifying by using a first chromatographic column, wherein a filler is cellulose-based anion exchange resin; (8) purifying by using a second chromatographic column to obtain purified gastrodia elata polysaccharide; and the filler is sephadex. According to the present invention, the gastrodia elata crude polysaccharide is purified by using the five purification means, such that the high-purity gastrodia elata purified polysaccharide can be rapidly, stably and efficiently obtained.

The invention discloses an ethylene-vinyl alcohol copolymer and a preparation method thereof, and relates to the technical field of resin. According to the technical scheme, the preparation method comprises the following steps: adding ethylene, low-carbon alkane, alkyl acid ethyl ester, alkyl acid vinyl ester and a carbon-carbon skeleton initiator into a reaction kettle, and carrying out a free radical polymerization reaction; adding a polymerization inhibitor to terminate the reaction, removing low-carbon alkane, unreacted ethylene and alkyl acid vinyl ester, and preparing the reaction liquid into an alcoholic solution; adding a catalyst into the alcohol solution for saponification reaction, and then performing acid pickling, water washing and drying to obtain the ethylene-vinyl alcohol copolymer. The low-carbon alkane which is low in boiling point, easy to vaporize and high in latent heat of vaporization and the saturated alkyl acid ethyl ester with good solubility are adopted as the mixed solvent to replace a traditional alcohol solvent, so that removal and control of reaction heat are facilitated, generation of insoluble gel is reduced, a copolymer with narrow molecular weight distribution is easy to obtain, and the method is suitable for industrial production. The cost that azeotrope formed by the alcohol solvent and the monomer is difficult to separate and recover is greatly reduced, and the production efficiency is improved.

The invention discloses a preparation method of second-generation denitrified flavin TND1128, which comprises the following steps: S1, by taking 1-methylbarbituric acid and o-aminobenzaldehyde as raw materials and a mixture of water and alcohol as a solvent, heating and reacting to generate an intermediate I; s2, taking the intermediate I as a raw material, and performing ethylation under the combined action of inorganic alkali and an ethylation reagent to generate a TND1128 crude product; s3, the TND1128 crude product is purified, and a TND1128 pure product is obtained; according to the invention, 1-methylbarbituric acid and 2-nitrobenzaldehyde are taken as raw materials for cyclization synthesis of an intermediate I, then ethylation and pulping purification are carried out under the combined action of inorganic base and an ethylation reagent, and high-purity TND1128 is synthesized in a high-yield, high-specificity and high-selectivity manner; the method has the advantages of simple process route, good reaction selectivity, high yield, cheap and easily available raw materials, low equipment requirement, easy realization of industrial production and the like.

The invention discloses a hydrogel patch for gastric perforation repair and a preparation method thereof, and belongs to the technical field of biomedical materials. The preparation method comprises the following steps: dissolving acryloyl valine, acrylic acid, methylene bisacrylamide, a compound A and a photoinitiator in an alcohol solvent, and defoaming to obtain a precursor solution; and placing the precursor solution in a mold, carrying out ultraviolet-induced curing, soaking the obtained hydrogel in a hydrochloric acid solution, and replacing the alcohol solvent to obtain the hydrogel patch for gastric perforation repair. The hydrogel patch provided by the invention has the advantages of strong acid corrosion resistance, good biocompatibility, low swelling ratio, stable adhesion performance in a fluctuating pH environment and the like. The tough and stable adhesion performance ensures that the hydrogel can be permanently and reliably adhered to a gastric perforation part in a dynamic gastric acid environment, and a stable platform is provided for drug delivery, so that the surgical operation time is expected to be shortened, and wound healing is promoted.

The invention provides a preparation method of prismatic titanium diboride powder, and belongs to the technical field of titanium diboride powder. The preparation method comprises the steps of titanium source preparation, boron source preparation, material mixing, cold isostatic pressing and carbon thermal reduction reaction. The step of preparing the titanium source comprises the following steps: heating TiO2 powder body liquid, raising the temperature to 52-55 DEG C, adding a tetrabutyl titanate solution, uniformly stirring, adding an ammonia water solution to adjust the pH value to 7.0, and carrying out heat preservation stirring for 2.7-3.2 hours to obtain the titanium source; the step of preparing the boron source comprises the following steps: adding B4C powder into absolute ethyl alcohol, carrying out ultrasonic dispersion, then adding a mixed solution, controlling the adding rate of the mixed solution to be 0.8-1.2 g / min, heating to 34-37 DEG C, and carrying out heat preservation and stirring for 3.8-4.2 hours to obtain the boron source; the titanium diboride powder obtained through the method is in a prism shape and is uniform in particle, high in density and purity and poor in high-temperature oxidation resistance.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.