587 results about "Benzaldehyde" patented technology

The invention discloses an immunoregulation hydrogel as well as a preparation method and application thereof, and relates to the technical field of medical materials, amino-derived cationic polysaccharide, carboxyl-derived anionic polysaccharide and dopa-modified protein biopolymer materials are used as biological matrix materials, spermidine is used as a bioactive functional component, and the immunoregulation hydrogel is prepared by a one-step method. The preparation method comprises the following steps: by taking a benzaldehyde-terminated high polymer material as a cross-linking agent, forming a first layer of dynamic reversible cross-linked network structure through Schiff base reaction; then calcium ions are introduced, and the calcium ions and carboxylate radicals are complexed and cross-linked to form a second layer of static irreversible cross-linked network structure which can be used for an ESD (Electro-Static Discharge) operation. By adopting a step-by-step cross-linking mode, the first-step cross-linked single-network hydrogel has injectability, self-repairability, tissue adhesiveness and an immune regulation function, and the second-step cross-linking further ensures stable and lasting performance, so that the problems that a submucosal injection material is easy to disperse, short in lasting time and poor in stability are solved. The immunoregulation function effect of the wound repair material is poor.

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 unsaturated polyester resin for an unmanned aerial vehicle fuselage and a preparation method of the unsaturated polyester resin, and relates to the field of high polymer materials. When the unsaturated polyester resin for the unmanned aerial vehicle fuselage is prepared, a flame-retardant monomer reacts with 2-hydroxy-5-(hydroxymethyl) benzaldehyde to prepare a modified flame-retardant monomer; reacting cellulose with acrylic acid to obtain pre-modified cellulose; the pre-modified cellulose, 1-allyl-1, 1, 3, 3-tetramethyldisiloxane and chloroplatinic acid are subjected to a reaction, and modified cellulose is prepared; maleic anhydride, 5-(1H-imidazole-1-yl)-1, 3-phthalic acid, propylene glycol and the modified flame-retardant monomer are subjected to a reaction, and pre-polyester is prepared; and stirring the pre-polyester, zinc chloride, modified cellulose, benzophenone peroxide and styrene to obtain the anti-aging coating. The prepared unsaturated polyester resin for the unmanned aerial vehicle fuselage has good anti-aging, self-repairing, flame-retardant and self-cleaning performance.

The invention provides a triphenylamine derivative as well as a preparation method and application thereof in killing gram-positive bacteria. The preparation method comprises the following steps: firstly, synthesizing an intermediate molecule 4-di-p-methoxyanilino benzaldehyde (s); the s respectively reacts with 3-pyridylacetonitrile and 4-pyridylacetonitrile to generate intermediate molecules a and b; the intermediate molecules a and b respectively react with methyl iodide to generate triphenylamine derivatives 1 and 2, and the intermediate molecules a and b respectively react with 9-bromomethyl anthracene to generate triphenylamine derivatives 3 and 4. The prepared triphenylamine derivative has a donor-acceptor structure and is a D-pi-A structure, the modified triphenylamine is used as a donor, a carbon-carbon double bond is used as a covalent bridge, and cyano and N positive ions have electron withdrawing property. As all the components contain positive ions, the components can be anchored on a bacterial membrane to kill bacteria; and the compound has a short alkyl chain and can be combined with gram-positive bacteria, so that the bacteria are killed.

The invention relates to the technical field of organic synthesis, in particular to a synthesis method and application of functional caprolactam and functional nylon-6. The synthesis method comprises the following steps: in the presence of a catalyst and a solvent, enabling amino caprolactam and / or a derivative thereof to contact and react with benzaldehyde, so as to obtain functional caprolactam which is bis (benzyl) amino caprolactam, wherein the reaction conditions are as follows: the temperature is 150-350 DEG C; the hydrogen pressure is 0.1 to 10 MPa; the time is 5-15 hours. The synthesis method not only has the advantages of high reaction efficiency, high catalytic efficiency, adjustable target product selectivity and the like, but also simplifies process conditions, and realizes green large-scale production.

The invention discloses a preparation method and application of a photo-thermal dual-response membrane material, and relates to the field of membrane materials. When the photo-thermal double-response membrane material is prepared, a photo-thermal material firstly reacts with 4-(triethoxysilyl) aniline and then reacts with 2, 4, 6-trihydroxy-1, 3, 5-benzenetricarboxaldehyde and p-phenylenediamine, and a modified photo-thermal material is prepared; the preparation method comprises the following steps: sequentially reacting benzaldehyde with 2-hydroxyacetophenone and 3-N, N-dimethylamino methacryloyl chloride to prepare a photo-initiation monomer; the preparation method comprises the following steps: mixing N-isopropylacrylamide, a photo-initiation monomer, N, N '-methylene bisacrylamide and a modified photo-thermal material, combining with a hydrophobic substrate membrane, preparing a membrane, and finishing the surface by using 2-bromo-1-[3, 5-di (tert-butyl)-4-hydroxyphenyl] ethanone, thereby obtaining the photo-thermal dual-response membrane material. The photo-thermal dual-response membrane material prepared by the invention has the characteristics of pollution resistance, easiness in cleaning, durability, antibacterial property, metal ion recovery and low energy consumption.

The invention discloses a mechanical force-induced fluorescence discoloration sensor material as well as a preparation method and application thereof, and relates to the technical field of organic synthesis and fine chemical engineering. The preparation method comprises the following steps: step 1, carrying out heating reaction on 4-(1, 2, 2-triphenyl vinyl) benzaldehyde, 3-(2, 2-dicyano-1-(3, 4-diaminophenyl) vinyl) benzene-1-yl and a catalyst to prepare a compound 1-1; and 2, carrying out heating reaction on the obtained compound 1-1 and methyl iodide under the action of alkali and a solvent, and analyzing and purifying to obtain a compound 1-2. The compound disclosed by the invention is low in preparation cost, simple and convenient to operate and simple in method, the compound shows the material characteristic of mechanical force-induced fluorescence discoloration and can be applied to the fields of sensors, dyes, anti-counterfeiting and the like, and meanwhile, the synthesis method can be used for synthesis in the fields of fine organic chemical engineering such as luminescent materials, printing and dyeing technologies and the like.

The invention discloses a benzaldehyde lyase derived from Pseudomonas fluorescens, a mutant of the benzaldehyde lyase, and an application of the benzaldehyde lyase and the mutant of the benzaldehyde lyase as a catalyst in catalysis of chiral amino alcohol. The invention further discloses a preparation method of the benzaldehyde lyase and the mutant of the benzaldehyde lyase. The benzaldehyde lyase disclosed by the invention has the advantages of high reactivity, high stereoselectivity, wide substrate range and the like, the yield is as high as 99%, the ee value is as high as 99%, low-cost production is favorably realized, and the benzaldehyde lyase has an industrial application prospect.

The invention discloses an anti-radiation fabric and a preparation method thereof, and relates to the technical field of fabric preparation. When the anti-radiation fabric is prepared, bismuth powder is pre-modified with (3-chloropropyl) trimethoxysilane and then reacts with an anti-aging agent to prepare modified bismuth powder; the preparation method comprises the following steps: enabling 4-aminophenylethanol and 4-(2-ethoxyl) benzaldehyde to react to prepare a flame-retardant monomer, and then enabling the flame-retardant monomer to react with isophorone diisocyanate and 1, 4-butylene glycol to prepare polyurethane; the preparation method comprises the following steps: reacting dimethylallylamine with 1, 3-bis (chloromethyl)-1, 1, 3, 3-tetramethyldisiloxane to obtain an antibacterial cross-linking agent; the modified bismuth powder, N, N-dimethylformamide, polyurethane, an antibacterial cross-linking agent and benzoyl peroxide are mixed to prepare a polyurethane coating, the outer side surface of polyester base cloth is coated with the polyurethane coating, drying is conducted, and the anti-radiation coating fabric is prepared. The anti-radiation fabric prepared by the invention has good anti-radiation, anti-light aging, flame-retardant and antibacterial properties.

The invention discloses a high-flame-retardant bio-based aerogel material and a preparation method thereof, and belongs to the technical field of flame-retardant bio-based aerogel. The high-flame-retardant bio-based aerogel material prepared by the preparation method disclosed by the invention is prepared from the following raw material components in parts by mass: 10 parts of a bio-based flame-retardant filler with a porous structure, 40 to 50 parts of a hydrophobic siloxane monomer, 12.4 to 12.6 parts of an ammonium phytate solution, 6.2 to 6.3 parts of guanosine, 31.1 to 31.4 parts of cellulose nanofibers and 0.01 to 0.02 part of benzaldehyde-polyethylene glycol-silane, the preparation method comprises the following steps: firstly, carrying out hydrolytic polycondensation on a bio-based flame-retardant filler with a porous structure and a hydrophobic siloxane monomer to form a siloxane polymer network with the bio-based flame-retardant filler as a branching center; then adding cellulose nanofibers, guanosine and an ammonium phytate solution, and performing freeze casting-freeze drying-heating post-treatment to obtain the composite material. Wherein the bio-based flame-retardant filler is obtained by compounding a porous cuttlefish ink carbon quantum dot composite material with phytic acid siloxane and trimethoxy (3-(4-nitrophenoxy) propyl) silane.

The invention discloses a preparation method of a low-chlorine composite environment-friendly coal transportation anti-freezing agent, and belongs to the technical field of anti-freezing solutions. The anti-freezing solution is used for solving the technical problems of complex components and poor anti-freezing and metal corrosion resistance of the anti-freezing solution for coal transportation in the prior art. The preparation method of the low-chlorine composite environment-friendly coal transportation anti-freezing agent comprises the following step: uniformly mixing the compound pour point depressant, the modified corrosion inhibitor, the thickening stabilizer and the industrial water to prepare the low-chlorine composite environment-friendly coal transportation anti-freezing agent. The compound pour point depressant comprises an organic pour point depressant and an inorganic pour point depressant; the organic pour point depressant is obtained by reacting unsaturated azole, sodium methallyl sulfonate and fumaric acid; the unsaturated nitrogen is obtained by reaction of an intermediate B and benzaldehyde, and the intermediate B is obtained by reaction of triazole and ethyl chloroacetate; the modified corrosion inhibitor is obtained by carrying out a reaction on potassium thiocyanate, benzoyl chloride and chitosan vanillin Schiff base. The anti-freezing solution prepared by the invention has the advantages of moderate fluidity, good metal corrosion resistance and good anti-freezing performance.

The invention discloses an organic phosphorescent material intermediate for an OLED (Organic Light Emitting Diode) as well as a preparation method and application of the organic phosphorescent material intermediate, and relates to the field of organic phosphorescent materials. The intermediate is prepared through a Diels-Alder cycloaddition reaction between trans-cyclooctene and 3, 6-diphenyltetrazine, the reaction is carried out under the conditions that the temperature is 20-30 DEG C and the time is 10-30 minutes, and the mass ratio of the trans-cyclooctene to the 3, 6-diphenyltetrazine is 1: (1.0-2.5). Trans-cyclooctene is prepared by isomerizing cis-cyclooctene under the irradiation of 254nm ultraviolet light in the presence of a photosensitizer; the 2, 3, 6-diphenyl tetrazine is prepared by condensation, cyclization and purification of benzaldehyde and benzoyl hydrazine. The purity of the prepared intermediate reaches up to 99.2%, the yield reaches 82.4%, the intermediate serving as an OLED luminescent material has excellent thermal stability, and the quantum efficiency is still kept at 90.1% after HTHH treatment is conducted for 1000 h. The invention provides a new intermediate choice for developing a high-performance OLED (Organic Light Emitting Diode) material.

The invention relates to the technical field of polyethylene mixed materials, in particular to a polyethylene mixed material for a large-caliber thick-wall pressure-resistant polyethylene pipe and a preparation method of the polyethylene mixed material, and the polyethylene mixed material comprises the following components in percentage by mass: 93-96% of high-density polyethylene copolymer, 3.5-7% of master batch and 0.5-1% of compound antioxidant system, the high-density polyethylene copolymer is obtained by copolymerization of ethylene and a vinyl benzaldehyde compound, and the molar ratio of an ethylene monomer unit to a vinyl benzaldehyde compound unit in the high-density polyethylene copolymer is (89-96): (4-11); the master batch comprises high-density polyethylene resin prepared by catalyzing modified carbon black and a Ziegler-Natta catalyst. Compared with the prior art, the melt sag resistance of the polyethylene mixture in the extrusion of large-diameter thick-wall pipes is greatly improved, and the prepared mixture can be successfully used for processing 36in DR9 pipes.

The invention discloses an extracellular vesicle derived from rhodomonas mucilaginosa and a hydrogel composition of the extracellular vesicle. The extracellular vesicle is obtained by carrying out ultrafiltration concentration and gradient ultracentrifugation on a culture bacterium solution. Compared with an original culture solution or a viable bacterium preparation thereof, the treatment efficiency and the safety of the extracellular vesicles are remarkably improved. Based on the extracellular vesicle, the invention also provides a hydrogel composition loaded with the extracellular vesicle, and the hydrogel composition is constructed from the extracellular vesicle, type I collagen, carboxymethyl chitosan and four-arm polyethylene glycol benzaldehyde in a chemical crosslinking manner, and has good adhesiveness, self-repairing ability and injectability. The extracellular vesicle, the hydrogel composition and the hydrogel preparation of the extracellular vesicle can serve as a medicine or a medicine carrier to be applied to atopic dermatitis, can specifically target 2-type inflammatory factors, and relieve pathological changes such as skin lesion phenotype, epidermis thickening, mast cell infiltration and inflammatory factor expression increase of an MC903-induced atopic dermatitis mouse model.

The invention provides a preparation method of an omariglitazone intermediate, which comprises the following steps: by taking p-halogenated benzaldehyde as a raw material, carrying out aldol condensation reaction, hydrolysis, decarboxylation, reduction, ring closing and the like to obtain an intermediate as shown in a formula 9, carrying out catalytic reaction, reduction reaction, ring closing and the like to obtain an intermediate as shown in a formula 13, and finally hydrolyzing to obtain a target product omariglitazone intermediate A. According to the invention, links of precious metal use and chiral resolution (key steps influencing cost and yield) in the prior art are avoided, and a method for synthesizing a single configuration through a chemical method is adopted, so that the yield is greatly improved, and the production cost is greatly reduced; meanwhile, a synthesis route is broken through, a target product is synthesized through cheap initial materials, and post-treatment is simpler and more controllable.

The invention relates to the technical field of organic synthesis, in particular to 4-chloro-1-methyl-6H-heterochromene [3, 4-c] pyridine as well as a synthesis method and application of the 4-chloro-1-methyl-6H-heterochromene [3, 4-c] pyridine. The synthesis method comprises the following steps: (1) synthesizing 2-chloro-3-fluoro-4-iodine-5-methylpyridine from 2-chloro-3-fluoro-5-methylpyridine and an iodine elementary substance to obtain 2-chloro-3-fluoro-4-iodine-5-methylpyridine; (2) synthesizing 2-(2-chloro-3-fluoro-5-methylpyridine-4-yl) benzaldehyde from the 2-chloro-3-fluoro-4-iodo-5-methylpyridine, the 1, 1-bis (diphenylphosphine) ferrocene palladium dichloride, the tripotassium phosphate and the (2-formyl phenyl) boric acid, and further synthesizing the 2-(2-chloro-3-fluoro-5-methylpyridine-4-yl) benzaldehyde from the 2-chloro-3-fluoro-4-iodo-5-methylpyridine and the 1, 1-bis (diphenylphosphine) ferrocene palladium dichloride. And (3) synthesizing the 4-chloro-1-methyl-6H-heterochromene [3, 4-c] pyridine by using the 2-(2-chloro-3-fluoro-5-methylpyridine-4-yl) benzaldehyde and sodium tert-butoxide. The 4-chloro-1-methyl-6H-heterochromene [3, 4-c] pyridine compound constructed by the invention can be used for detecting the content of pesticide residue glyphosate.

The invention relates to the technical field of roadbed materials, and provides a Bayer process red mud roadbed material and a preparation method thereof.The Bayer process red mud roadbed material is prepared from, by weight, 100 parts of Bayer process filter pressing red mud, 1-30 parts of modified fly ash, 50-150 parts of a soil material, 2-10 parts of an accelerant and 0.01-0.8 part of a dispersing agent; wherein the modified fly ash is prepared from the following raw materials: fly ash, a silane coupling agent and 4-(2-hydroxyethoxy) benzaldehyde, and through the technical scheme, the problem that the Bayer process red mud roadbed material in the prior art is low in impermeability and mechanical property is solved.

The invention discloses a non-woven fabric made of Juncao fibers, and belongs to the technical field of textiles. The non-woven fabric made of the Juncao fibers is obtained by opening and mixing modified Juncao regenerated cellulose fibers, carding to form a net and needling and reinforcing; the modified pennisetum sinese regenerated cellulose fiber is prepared by the following steps: dipping dried pennisetum sinese pulp, squeezing, carrying out graft copolymerization on the squeezed dried pennisetum sinese pulp, 2-acrylamide-2-methylpropanesulfonic acid and benzaldehyde PEG acrylamide under the catalysis of ceric ammonium nitrate, dissolving, then adding chamomile essential oil microcapsules, reacting, and spinning. The chamomile essential oil microcapsule is prepared by the following steps: dispersing chamomile essential oil into a continuous phase containing an allyl monomer by an SPG membrane emulsification method to form a microemulsion, and preparing the chamomile essential oil microcapsule by combining an interfacial polymerization method; wherein the allyl monomer is prepared from methacrylic acid, methyl methacrylate, pentaerythritol tetraacrylate and N-(4-acetylphenyl) prop-2-acrylamide.

The invention discloses alkoxy amine and application of the alkoxy amine in induction of NMP (N-Methyl Pyrrolidone) polymerization of methacrylate monomers and styrene monomers. The alkoxy amine is a novel compound which is synthesized by taking benzaldehyde and isopropylamine as raw materials through three-step reaction of Schiff base reduction, oxidizing agent oxidation and free radical coupling. The obtained alkoxyamine can be used as a monomolecular initiator to effectively regulate and control controllable polymerization of methacrylate and styrene monomers under anaerobic or aerobic conditions, and the peak pattern of a gel chromatography outflow curve is symmetrical and has no obvious tailing phenomenon, so that the alkoxyamine can expand the range of nitroxide free radical polymerization regulation and control monomers, and the preparation method is simple and easy to implement. The method has a good application prospect in the aspect of synthesis of functional polymer materials.

The invention relates to a method for reducing the content of 2, 6-diaminotoluene and / or 2, 4-diaminotoluene in a polyol, in particular in a recovered polyol, in which a polyol containing 2, 6-diaminotoluene and / or 2, 4-diaminotoluene is reacted with at least one compound selected from the group consisting of a), b) and c), in which the polyol containing 2, 6-diaminotoluene and / or 2, 4-diaminotoluene is reacted with at least one compound selected from the group consisting of a), b) and c), wherein: a) one or more epoxy-functional compounds, preferably dodecyl / tetradecyl glycidyl ethers, b) one or more anhydrides, in particular phthalic anhydrides, and c) one or more aldehydes, preferably benzaldehyde.

The invention belongs to the technical field of medicines, and particularly relates to bletilla striata polysaccharide hydrogel as well as a preparation method and application thereof. The BSP-MA / HA-NB hydrogel is prepared by screening the variety, dosage and preparation process of each component in the hydrogel, and the hydrogel is prepared from the following raw materials: methacrylated bletilla striata polysaccharide, o-nitrobenzaldehyde modified hyaluronic acid and the like. The adhesive property and the mechanical property of the hydrogel are obviously improved; the long-acting slow-release effect of the medicine components is achieved, the proliferation activity and migration ability of the bone marrow mesenchymal stem cells are promoted, and the bone marrow mesenchymal stem cells have good application prospects in the aspect of bone defect repair treatment.

The invention discloses a triarylmethane type I photosensitive dye as well as a synthesis method and application thereof. The structure of the dye is shown as a general formula I; intramolecular charge separation is optimized by regulating substituent groups, and the generation efficiency of superoxide anions and hydroxyl radicals is remarkably improved. According to the synthesis method, 4-diphenylaminobenzaldehyde or 4-vinyl benzaldehyde is used as a raw material, efficient preparation is achieved through the steps of condensation, oxidation and the like, the raw material is easy to obtain, and operation is easy and convenient. The dye has strong absorption at the wavelength of 600-630 nm, is suitable for red light triggered photodynamic therapy (PDT), especially keeps high reactive oxygen yield under the hypoxic condition, and breaks through the oxygen dependence limitation of traditional PDT. Experiments show that the dye can induce ferroptosis of tumor cells, has the functions of fluorescence imaging and treatment, and has wide application prospects in the fields of antitumor drugs, in-vivo fluorescence labeling, photoresponsive functional preparations and the like.

The invention provides ester group functionalized cyclotriveratrum hydrocarbon as well as a preparation method and application thereof, and relates to the technical field of gas chromatographic analys.According to the ester group functionalized cyclotriveratrum hydrocarbon and the preparation method and application thereof, a long alkyl chain and an ester group are introduced to the lower edge of cyclotriveratrum hydrocarbon, so that the property of the cyclotriveratrum hydrocarbon serving as a gas chromatographic stationary phase is improved; by introducing a non-polar alkyl chain and a polar ester group, the melting point of the cyclotriveratrum hydrocarbon can be reduced, the film-forming property and the thermal stability of the cyclotriveratrum hydrocarbon are improved, and the separation performance of the cyclotriveratrum hydrocarbon serving as a stationary phase of a capillary gas chromatographic column on an analyte is improved; the method can effectively separate methyl benzaldehyde isomers, bromobenzaldehyde isomers, nitrobenzaldehyde isomers, diethylbenzene isomers, benzene series, homologues, cis-trans isomers and multi-component complex mixtures.

The invention discloses thermochromic dye as well as preparation and application thereof, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: firstly, taking a fluorane dye as a raw material, and introducing an amino group into a fluorane dye structure by utilizing a reaction between lactone and alkyl diamine; and then preparing the thermochromic dye by utilizing the aldehyde amine reaction between the amino fluorane dye and the benzyloxy hydroxy benzaldehyde. The parent structure of the prepared thermochromic dye fluorane is connected with an alkyl chain and a benzylbenzaldehyde structure through a stable covalent bond, and latent heat of phase change comes from Van der Waals force between methylene on the alkyl chain and conformation overturning energy of the alkyl chain in the structure. And two benzene rings in the benzyloxy hydroxy benzaldehyde structure are used for hindering temperature crystallization below the melting point, so that the material melting and crystallization processes are regulated and controlled.

To provide a fine granulated agent replenishing liquid for a plating liquid, with the replenishing liquid being excellent in the initial stability and safety, and the replenished plating liquid being excellent in the aging stability, without damaging the appearance of a plating film when replenished for a long period of time nor dissolving an organic resist film present on a material to be plated.SOLUTION: A fine granulated agent replenishing liquid for a plating liquid, replenishing a fine granulated agent to a tin-based plating solution including one or two or more kinds of compounds selected from the group consisting of benzaldehyde, 1-naphthaldehyde, 1-naphthoic acid, 1-acetonaphthone, DL-1-(1-naphthyl)ethylamine, and benzylidene acetone, includes a phenyl glycol-based surfactant, the fine granulated agent and water, with a content of the fine granulated agent therein being in a range of 0.1 g / L or more and 10.0 g / L or less, a content of the phenyl glycol-based surfactant therein being in a range of 5 g / L more and 50 g / L or less, and a content of alcohol being less than 1 mass%.SELECTED DRAWING: None

The invention discloses long-acting high-dynamic hydrazone bond hydrogel as well as a preparation method and application thereof, and particularly relates to the technical field of biomedical materials. The preparation method comprises the following steps: taking 1-adamantane acetic acid and adipic dihydrazide modified sodium hyaluronate and benzaldehyde-terminated eight-arm polyethylene glycol as carrier raw materials; the hydrazone bond hydrogel with relatively high stability is prepared through a coupling reaction of an aldehyde group of benzaldehyde-terminated eight-arm polyethylene glycol and a hydrazide group of 1-adamantane acetic acid and adipic dihydrazide modified sodium hyaluronate. The beta-cyclodextrin modified m-phenylenediamine catalyst is dynamically combined into the carrier through reversible host-guest complexation between beta-cyclodextrin and 1-adamantane acetic acid, so that the long-acting high-dynamic hydrazone bond hydrogel is obtained, and the requirement of three-dimensional culture of stem cells on mechanical properties can be met; and network dynamics can be maintained for a long time, so that stem cell spreading is supported, mechanical signal transduction is activated, osteogenesis-related gene expression is promoted, and stem cell osteogenesis differentiation capability is enhanced.

The present invention discloses a metal porphyrin containing a hexafluoropropylene trimer group, a preparation method thereof and an application; a benzaldehyde derivative containing a hexafluoropropylene trimer group, freshly distilled pyrrole, and a metal acetate are dissolved in a mixed solvent of methanol and chloroform, and under a nitrogen atmosphere, the reaction is stirred at 0 to 80 °C for 6.0 to 168.0 h. After the reaction is completed, through post-treatment, a metal porphyrin containing a hexafluoropropylene trimer group is obtained; the metal porphyrin containing a hexafluoropropylene trimer group described in the present invention can be used in the reaction of catalytic oxidation of cycloalkanes by O2. The cycloalkane oxidation method provided by the present invention has high selectivity for partial oxidation products (cycloalkyl alcohols and cycloalkyl ketones), low contents of explosive peroxides and deeply oxidized product aliphatic diacids, and is a safe, effective cycloalkane oxidation method with low separation energy consumption.

This invention belongs to the field of crop cultivation technology, specifically relating to a rice nano-flavor enhancer and its application in rice cultivation. The rice nano-flavor enhancer of this invention is prepared from raw materials such as sodium octenyl succinate starch, sodium ascorbate, and sodium selenite. The prepared octenyl succinate starch-nano-selenium has advantages such as small nanoparticle size and system stability. This flavor enhancer can not only significantly improve the overall aroma of fragrant rice, but also enhance the aroma of non-fragrant rice. Specifically, it can significantly increase the content of volatile aroma compounds such as 2-acetyl-1-pyrroline (2-AP) in fragrant rice grains, and significantly increase the content of volatile aroma compounds such as vanillin, benzaldehyde, and geranylacetone in non-fragrant rice grains. Unlike traditional rice flavor enhancers, the rice nano-flavor enhancer of this invention has better applicability and a wider range of applications, helping to meet the growing market demand for high-quality rice.

This invention relates to iron single-atom composite catalysts with a double-layered carbon dot core-carbon-nitrogen shell structure and their applications. The catalyst preparation method is as follows: carbon source, nitrogen source, and iron metal salt are dispersed in a mixed solution of solvent and coordinating agent and stirred evenly, followed by hydrothermal reaction; after the reaction, the supernatant is filtered and dialyzed, and the dialysate is freeze-dried to obtain Fe. SA / CDs material; add zinc nitrate hexahydrate and iron metal salt to deionized water, add Fe SA / CDs aqueous solution, then add the solution of 2-methylimidazole completely dissolved in deionized water, ultrasonically stir, and after the reaction, obtain Fe. SA / CDs / Fe@ZIF-8 precursor; the precursor was subjected to Joule heat treatment and cooled to room temperature to obtain an iron single-atom composite catalyst with a bilayer carbon dot core-carbon-nitrogen shell structure. This invention effectively improves the catalytic activity and stability of the catalyst in the benzaldehyde oxidative nitrification reaction.

The invention discloses a high performance liquid chromatography analysis method for trace impurity content in an organic amine catalyst, and relates to the field of organic catalyst content analysis. Comprising the following steps: pretreating an organic amine catalyst sample, preparing a urea standard solution, performing HPLC (High Performance Liquid Chromatography) analysis and performing quantitative analysis by an external standard method, namely performing derivatization reaction on urea and benzaldehyde under an acidic condition, and successfully converting urea without ultraviolet absorption into dibenzylidene urea (DBU) with strong ultraviolet absorption, the technical blank of direct detection of urea is effectively filled, and the method is adaptive to a conventional ultraviolet / visible light detector to realize accurate detection. And the method has relatively high practical popularization and application values. The method has the advantages of being good in separation effect, high in sensitivity, easy and convenient to operate, high in reproducibility and the like, and can be widely applied to qualitative and quantitative analysis of various trace impurities in the organic amine catalyst.