359 results about "Carboxylation" patented technology

The invention relates to the field of membrane materials, and discloses an epoxy modified starch-based degradable membrane and a preparation method thereof, the epoxy modified starch-based degradable membrane comprises epoxidized starch, modified nanocellulose and a plasticizer; the modified nano cellulose is prepared by mixing a modified composite filler, a nano cellulose dispersion liquid and a zinc acetate dihydrate aqueous solution; the nano-cellulose dispersion liquid is prepared by adhering polytannic acid formed by oxidation and self-polymerization of tannic acid to the surface of nano-cellulose; the modified composite filler is prepared by performing carboxylation modification on nano titanium dioxide coated fumed silica nanoparticles by using succinic anhydride and gamma-aminopropyltriethoxysilane, then reacting with polyethyleneimine to obtain an aminated composite filler, and finally grafting glycidyl dodecyl dimethyl ammonium chloride to the surface of the aminated composite filler. The prepared film material is high in tensile strength, has certain hydrophobicity, and has good heat resistance, antibacterial property and flame retardant property.

The present invention belongs to the technical field of biomedical materials. Disclosed are a methacrylate, a succinate-diesterified starch, a preparation method therefor and the use thereof in an in-situ filler for corneal defects. The methacrylate, succinate-diesterified starch is prepared by means of performing graft carboxylation on starch and then grafting a double bond. The in-situ filler for corneal defects consists of the methacrylate succinate-diesterified starch (StacMA), gelatin methacryloyl (GelMA), a photoinitiator and a solvent. The corneal filler has a good biocompatibility, an excellent photoresponsive adhesion property and excellent mechanical properties, and can be used for promoting the regeneration of the natural structure of a damaged cornea and the reconstruction of visual function.

The invention discloses a carbon fiber surface treatment process, which belongs to the technical field of organic synthesis, and comprises the following steps: S1, taking melamine, adding into tetrahydrofuran, adding carboxylated carbon fiber and a condensing agent, heating to 50-60 DEG C, stirring for 3-4 hours, washing, and drying to obtain melamine modified carbon fiber; s2, adding nano silicon dioxide into DMF (Dimethyl Formamide), performing ultrasonic treatment, adding a silane coupling agent KH550 and succinic anhydride, stirring for 3-5 hours, washing and drying to obtain modified silicon dioxide; and S3, adding the modified silicon dioxide into DMF, adding the melamine modified carbon fiber and a condensing agent, heating to 90-100 DEG C, stirring for 4-5 hours, washing, and drying to obtain the surface-treated carbon fiber. The silane coupling agent KH550 and butanedioic anhydride are used for carboxylation modification of nano silicon dioxide, melamine is used as a coupling agent, nano silicon dioxide is grafted on carbon fibers, surface defects on the surfaces of the carbon fibers can be filled, and therefore the mechanical performance of the carbon fibers is improved.

The invention relates to the technical field of papermaking, and particularly provides high-strength tipping base paper for cigarettes and a preparation process of the high-strength tipping base paper. The tipping paper base paper for the cigarettes comprises a fiber raw material; functionalizing the nano cellulose; a cellulase; a dry strength agent; a wet strength agent; and a sizing agent. Nano cellulose is functionalized and a synergistic stepped enhancement mechanism is constructed, so that the synergistic breakthrough of the high-strength raw tipping paper for cigarettes in the aspects of strength, wet strength and air permeability is realized; after the functionalized nanocellulose is subjected to carboxylation treatment, the hydrogen bond and electrostatic adsorption between the functionalized nanocellulose and the fiber are enhanced, and the bonding strength in a dry state and a wet state is remarkably improved; meanwhile, the wet strength agent is added in stages, and the adsorption sequence of the dry strength agent is optimized, so that the reinforcing agent constructs a stable three-dimensional network framework in the paper sheet, and the end breaking risk under high-speed winding is effectively reduced.

The invention relates to the technical field of electronic materials, in particular to a preparation method of low-halogen alkali-soluble photosensitive resin and solder resist ink. Comprising the following steps: adding amino resin, alcohol olefin and a catalyst A into a solvent, mixing, and carrying out an ether exchange reaction to obtain an initial etherified product; adding peroxide into the initial etherification product, and carrying out epoxidation reaction to obtain an epoxy resin intermediate; adding an olefine acid compound, a catalyst B and a polymerization inhibitor into the epoxy resin intermediate, and carrying out ring-opening esterification reaction to obtain an epoxy acrylate intermediate; and adding acid anhydride into the epoxy acrylate intermediate, and carrying out carboxylation reaction to obtain the low-halogen alkali-soluble photosensitive resin. The problem of high halogen content of the existing alkali-soluble photosensitive resin is solved, and the solder resist ink prepared from the alkali-soluble photosensitive resin has high sensitivity, high resolution, high heat resistance, high acid and alkali resistance and high electrical insulation property.

The invention relates to a preparation method of a water-based environment-friendly coating, in particular to a preparation method of a multi-layer alternating type super-hydrophobic self-cleaning water-based environment-friendly coating, which is characterized in that TiO2 / ZIF-8 micro-nano structure particles with photocatalytic performance are prepared by growing ZIF-8 on the surface of carboxylated modified TiO2 in situ. Perfluorodecyl trimethoxy silane (PFDTES) is used as a main substance with a hydrophobic function, and water-borne epoxy resin (EP) is introduced to hybridize water-borne fluorocarbon resin (FEVE) to serve as a bonding layer. The preparation method comprises the following steps: chemically bonding TiO2 / ZIF-8 / PFDTES and hybrid resin by gamma-aminopropyltriethoxysilane (KH550) carrying activation sites through a site regulation and control technology, so as to form the synergistically functionalized super-hydrophobic self-cleaning water-based environment-friendly emulsion. And the coating isolates the adhesion effect of most bacteria and the harm of domestic sewage. The photocatalytic function can degrade an oil film formed by pollutants such as organic substances and oil stains on the surface of the material. The multi-layer alternate functional coating greatly enhances the corrosion resistance of the substrate material, and prolongs the service life of the material.

The invention relates to the field of oral cavities, and particularly discloses a lasting antibacterial type composite tooth socket for medicine carrying and a preparation method thereof.The lasting antibacterial type composite tooth socket comprises an adsorption layer and an antibacterial membrane layer, the adsorption layer is used for adsorbing oral cavity treatment liquid medicine, and the antibacterial membrane layer comprises a nano-silver antibacterial layer and a chitosan antibacterial layer; the preparation method comprises the following steps: mixing a tea polyphenol-polylactic acid composite solution, a nano-silver-carboxylation modified cellulose compound and a polyvinyl alcohol solution, and carrying out electrostatic spinning to prepare a nano-silver antibacterial fiber membrane, so as to form the nano-silver antibacterial layer; mixing chitosan with hot water, adding cinnamyl aldehyde, glycerol and boric acid, stirring to obtain a mixed solution, coating one side of the nano-silver antibacterial layer with the mixed solution, and curing to form a chitosan antibacterial layer; the adsorption layer is attached to the side, away from the chitosan antibacterial layer, of the nano-silver antibacterial layer, and then the lasting antibacterial type composite tooth socket for carrying the medicine is prepared through hot-pressing compounding. The drug-loaded composite tooth socket has the characteristic of further improving the antibacterial property and the antibacterial durability of the drug-loaded composite tooth socket.

The invention discloses immobilized lipase based on carboxymethyl chitosan / lignin cross-linked composite microspheres as well as preparation and application of the immobilized lipase. The preparation method comprises the following steps: mixing a lignin solution with formaldehyde and an amination modifier for reaction to obtain aminated lignin, and reacting the aminated lignin with EDC / NHS and a carboxylation modifier to obtain aminated-carboxylated modified lignin; mixing lipase, carboxymethyl chitosan, modified lignin and water as a water phase, mixing the water phase with an oil phase containing a surfactant, and emulsifying to form a W / O emulsion; and dropwise adding an EDC / NHS solution into the W / O emulsion to complete a cross-linking reaction, removing an oil phase, and washing to obtain the immobilized lipase based on the carboxymethyl chitosan / lignin cross-linked composite microspheres. The method is good in balling effect and controllable in particle size; the immobilized lipase based on the carboxymethyl chitosan / lignin cross-linked composite microspheres has good biocompatibility, is biodegradable, has good mechanical properties and catalytic performance, and has huge application potential.

The invention discloses a green construction of a porous separation membrane and an efficient uranium separation / enrichment method thereof.The method comprises the steps that firstly, mixed-dimension attapulgite clay acid etching powder is modified through phytic acid and then added into a saponin plant extracting solution, and then the mixture is mixed with a sodium alginate-chitosan double-network matrix; a film-forming solution with a high-mechanical-stability gas-liquid interface is obtained through a Pickering foam template method, and then the porous separation film is controllably constructed through cooperative strategies such as film casting, calcium cross-linking and carboxylation. Based on the advantages of a rod / sheet mixed dimension structure of minerals, synergistic interaction of plant derivatives and a spatial orientation regulation and control synergistic mechanism of functional groups, a porous separation membrane with a specific porous structure, excellent mechanical properties and uranium separation efficiency is constructed in a green manner, and the uranium separation efficiency is improved by combining optimization of membrane layer stacking and elution strategies. A high-efficiency uranium separation / enrichment method is developed, and a new normal form is provided for solving uranium pollution prevention and control and resource recovery and enrichment by a membrane separation technology.

The invention relates to the technical field of gene engineering and recombinase catalysis engineering, in particular to a recombinant strain for expressing phenolic acid decarboxylase as well as a construction method and application of the recombinant strain. According to the invention, a recombinant strain for expressing the phenolic acid decarboxylase PADCs is constructed by heterologous expression of a coding gene PADCs of the phenolic acid decarboxylase. The enzyme liquid of the recombinant strain for expressing the phenolic acid decarboxylase has remarkable catalytic performance, p-coumaric acid can be used as a substrate, the recombinant strain is used for inducing expression, the purified enzyme liquid is used for catalyzing decarboxylation reaction of p-coumaric acid, and p-hydroxystyrene is synthesized; meanwhile, the phenolic acid decarboxylase PADCs has a wide substrate spectrum, the 4-vinylphenol compound can be used as a substrate, bicarbonate is used as a carboxyl source, the freeze-dried whole cell of the recombinant strain is utilized to catalyze the 4-vinylphenol compound to carry out regioselective beta-carboxylation reaction, a series of phenolic acids with biological activity are synthesized by an enzymic method, and meanwhile CO2 is immobilized; and a huge application potential is provided for the utilization of CO2.

The invention discloses a construction method and application of a mixed-dimension attapulgite clay-based porous separation membrane, firstly, mixed-dimension attapulgite clay acid etching powder is added into a saponin plant extracting solution to obtain a suspension, then the suspension is mixed with a sodium alginate / glycerol aqueous solution, a Pickering foam template method is adopted to obtain a membrane forming solution, and the membrane forming solution is dried to obtain the mixed-dimension attapulgite clay-based porous separation membrane. And carrying out film casting, calcium crosslinking and carboxylation treatment to obtain the porous separation membrane. On the basis of the rod / sheet mixed dimension structure advantage of clay minerals and the synergistic stabilization effect of plant derivatives, the interfacial film strength, functional group spatial arrangement and network structure are efficiently regulated and controlled, the separation film with a multi-stage communicating pore structure and excellent mechanical performance and separation efficiency is constructed in a green mode, and the separation efficiency is improved by combining film layer stacking and acid pickling enrichment. A high-efficiency uranium separation / enrichment method is developed, and an innovative solution is provided for uranium pollution prevention and control and resource enrichment by a membrane separation technology.

The invention provides a method for estimating the photosynthetic nitrogen content of rice leaves based on sunlight-induced chlorophyll fluorescence. The method comprises the following steps: acquiring an observed value SIF of canopy sunlight-induced chlorophyll fluorescence based on induction equipment, and converting the observed value SIF into a total fluorescence excitation value SIFPSII of a light system II; on the basis of the rice photosynthetic physiological process, the incident photosynthetically active radiation I and the total fluorescence excitation value SIFPSII of a light system II, the electron transmission rate J is obtained through calculation, and the maximum electron transmission rate Jmax is obtained through calculation; then, the maximum carboxylation rate Vcmax is calculated based on the electron transmission rate J, so that the photosynthetic nitrogen content Ncb distributed to a carboxylation system and the photosynthetic nitrogen content Net distributed to an electron transmission system are calculated respectively, and the photosynthetic nitrogen content Ncb and the photosynthetic nitrogen content Net are superposed to obtain an estimated value PN of the photosynthetic nitrogen content of the leaves. According to the method, accurate estimation of the photosynthetic nitrogen content of the rice leaves is realized based on the mechanism relation between sunlight-induced chlorophyll fluorescence and the photosynthesis process of the rice, and accurate estimation of the photosynthetic nitrogen content of the rice in the field and regional scale can be realized.

The invention relates to the field of gene engineering, in particular to a phenolic acid decarboxylase mutant and application thereof. According to the invention, tryptophan at the 30th site of phenolic acid decarboxylase PADCs from Clostridium sp.DSM 8431 is mutated into leucine, and tyrosine at the 136th site of the phenolic acid decarboxylase PADCs is mutated into tryptophan, so that the phenolic acid decarboxylase mutant is obtained. The phenolic acid decarboxylase mutant can catalyze decarboxylation reaction of p-coumaric acid to synthesize p-hydroxystyrene; and hydrocarbonate can also be used as a carboxyl source to catalyze carboxylation reaction of p-hydroxystyrene to synthesize p-coumaric acid. The phenolic acid decarboxylase PADCs has the enzyme activity characteristics of excellent temperature stability and acetonitrile stability, still retains more than 80% of decarboxylase activity after being incubated for 2 hours at 55 DEG C, still retains about 36% of decarboxylase activity after being incubated for 2 hours in acetonitrile with the volume fraction of 50%, can remarkably improve the yield of p-coumaric acid, can reach 13.05 mM when the substrate concentration is 80 mM, and is improved by 74% compared with original phenolic acid decarboxylase PADCs; the method has a wide industrial application prospect and CO2 fixation potential.

The invention discloses a coagulant for industrial wastewater treatment and a preparation method thereof, and belongs to the technical field of water treatment.The coagulant comprises a main flocculant and an auxiliary flocculant, the main flocculant is polyferric sulfate and / or polyaluminum chloride, and the auxiliary flocculant is organic modified diatomite; the organic modified diatomite is prepared by condensing aminated diatomite and a carboxylation modifier; the aminated diatomite is diatomite treated by an aminated silane coupling agent. The auxiliary flocculant not only has a porous characteristic, active functional groups on the surface can adsorb metal cations, and the auxiliary flocculant can be integrally used as a crystal nucleus to promote growth and aggregation of other precipitates (such as ferric hydroxide, aluminum hydroxide and the like) on the surface, so that the precipitation process is accelerated, the removal efficiency of pollutants in wastewater is improved, and the wastewater treatment effect is improved. The effect of enhancing coagulation is achieved.

The application relates to the technical field of fluorine-containing wastewater treatment, and discloses a MOF modified zeolite fluorine removal agent as well as a preparation method and application thereof, which comprises the following steps: subjecting natural zeolite to carboxylation or calcination pretreatment; preparing a MOF precursor; the MOF precursor is prepared from at least two kinds of rare earth metal ions in La 3+ , Ce 3+ or Zr 4+ and an organic ligand; adding the MOF precursor into a DMF solvent, then adding the pretreated natural zeolite, and ultrasonic treatment for 5-10 min; adding the obtained mixed solution into a high-pressure reaction kettle, and reacting at 160 DEG C for 24 h; after the high-pressure reaction kettle is naturally cooled, the mixed solution in the high-pressure reaction kettle is centrifuged, the precipitate is washed with DMF for 3-5 times, and then dried at 65-90 DEG C for 18-24 h, so that the MOF modified zeolite fluorine removal agent is finally obtained. The disclosed fluorine removal agent has larger pore volume and specific surface area, and has good fluorine removal effect.

The invention relates to the technical field of dust removal filter materials, in particular to a fiber composite needled filter material and a preparation method thereof. In order to enhance the high-temperature performance of the needle-punched filter material, a modified carbon fiber material is added into polyethylene glycol terephthalate; according to the preparation method disclosed by the invention, the surface of the nano carbon fiber is subjected to carboxylation treatment after being subjected to oxidation treatment, a fluorine element is introduced into the surface of the carbon fiber on the basis, and a structure similar to ethylene glycol terephthalate is further prepared on the surface of the carbon fiber; therefore, the compatibility and the bonding strength between the carbon nanofibers and the polyethylene terephthalate are greatly improved; meanwhile, the fluorine element introduced in the process can greatly improve the stability of the polyester fiber at high temperature and enhance the resistance of the polyester fiber to chemical erosion such as acid and alkali, so that the service life of the filter material in high-temperature flue gas is prolonged.

The invention discloses silver-copper alloy nanoparticles with a core-shell structure as well as a preparation method and application of the silver-copper alloy nanoparticles. The core of the core-shell structure silver-copper alloy nanoparticle is a silver-copper alloy nanoparticle, and the shell of the core-shell structure silver-copper alloy nanoparticle is a ZIF-8 coating layer. The preparation method of the silver-copper alloy nanoparticles with the core-shell structure comprises the following steps: 1) preparing the silver-copper alloy nanoparticles; (2) preparing surface modified silver-copper alloy nanoparticles; and 3) dispersing the surface-modified silver-copper alloy nanoparticles, zinc salt and 2-methylimidazole in methanol for reaction. The silver-copper alloy nano-particles with the core-shell structure have the advantages of rich active sites, good catalytic effect, high cycling stability, mild reaction conditions, simple preparation method and the like, can be used for carboxylation of terminal alkyne and CO2 to generate propiolic acid compounds and carboxylation of propargyl amine and CO2 to generate 2-oxazolidinone compounds; and the method has a very wide application prospect.

The invention discloses an oxidized carbon black composite material and application of the oxidized carbon black composite material in a coating, and belongs to the technical field of carbon black material production.The oxidized carbon black composite material is subjected to a three-layer gradient design of a carboxylation inner core, a double-functional middle layer (hyperbranched and epoxy group) and a polyaniline / DBSA shell; three major breakthroughs of the prepared coating are realized: dispersibility and conductivity are compatible: the settling rate is less than or equal to 1.9% (solving agglomeration), and the resistance is less than or equal to 3.5 * 10 < 4 > omega / sq (constructing a high-efficiency conductive network); hygrothermal environment stability: the resistance change rate is less than or equal to + 9.1% (epoxy group and DBSA synergistically resist hygrothermal degradation); environment protection and waste reduction are achieved, a dispersing agent is replaced with a bio-based material (APG06), and the performance is not affected.

The invention discloses a hydrophilic oleophobic filter material as well as a preparation method and application thereof. The hydrophilic and oleophobic filter material is surface aminated hard particles grafted with polybasic acid, and the hydrophilicity of the hard particles is remarkably improved through amino-carboxylation; on the basis of a silanization reaction, a stable Si-O-Si covalent bond network is formed, an amino functional group is anchored, and further through an amidation reaction, a carboxylic acid group of polycarboxylic acid is directionally introduced into the surface to form a dense strong-polarity modification layer, so that the hydrophilic oleophobic filter material has high stability, long-acting property and excellent underwater oil stain resistance; the hydrophilic and oleophobic filter material and the hydrophobic and oleophylic filter material can form a non-uniform wettability filter material, the hydrophilic particles construct a low-resistance water phase channel to reduce head loss, the hydrophobic particles are utilized to realize interface demulsification and oil drop coalescence, non-demulsified micro-drops are screened and adsorbed layer by layer through a multi-stage filter bed, deep oil-water separation is achieved, and oil-water separation is realized. And the method has strong adaptability to complex oily wastewater containing surfactants and high acid, alkali and salt properties.

The invention discloses a preparation method of high-stability self-crosslinking colloid photon ink for inkjet printing of textiles, and provides a strategy of combining surface carboxylation hard core-soft shell type nano microspheres and fabric surface polymer induction. A reversible addition-fragmentation chain transfer polymerization (RAFT) emulsion polymerization method with high monomer conversion rate and good controllability is adopted, and the surface carboxylated hard core-soft shell type nano microspheres are prepared through a one-pot method. On the basis, a colloidal photon ink system is constructed by compounding a specific functional aid, so that the colloidal photon ink not only can maintain a stable state for 12 months under conventional storage conditions, but also can effectively resist a microsphere agglomeration phenomenon caused by high shear force and temperature shock in an ink-jet printing process, and the problem of nozzle blockage is avoided. According to the technical scheme, on the premise that the low solid content of the system is ensured, the color development saturation and the structural color stability are remarkably improved.

The invention discloses a high-wear-resistance supercritical foaming TPU material and a preparation method thereof, and relates to the technical field of high polymer materials, the material is prepared from the following components by weight: 100 parts of TPU particles, 5-20 parts of a wear-resistant filler, 3-10 parts of a compatilizer, 3-5 parts of a supercritical fluid foaming agent, 1-5 parts of a foaming promoter, 0.5-2 parts of an antioxidant and 0.5-2 parts of a lubricant; the wear-resistant filler is a compound of surface amination modified nano silicon dioxide and surface carboxylation modified polytetrafluoroethylene micro powder, the wear-resistant filler, TPU and other auxiliaries are subjected to melt blending granulation to obtain composite master batches, after the master batches are formed into sample strips, the sample strips are subjected to supercritical fluid impregnation and rapid pressure relief foaming, and the final product is obtained. Through a unique compound wear-resistant system and interface design, excellent wear resistance can still be maintained after supercritical foaming, the industrial problem that the wear resistance of a foaming material is poor is solved, the process is environment-friendly, and industrial production is easy.

The invention mainly relates to the technical field of composite material preparation, in particular to a preparation method and application of a PVDF / MOFs / GO composite membrane, and the preparation method comprises the following steps: cleaning and drying a PVDF membrane for carboxylation treatment; then immersing the PVDF membrane into a sodium hydroxide solution to obtain a carboxylated PVDF membrane; adding GO into deionized water to obtain a solution A; co (NO3) 2.6 H2O is dissolved, and a solution B is obtained; adding the solution A into the solution B, and stirring to obtain a Co < 2 + > / GO mixed solution; and filtering to the surface of the carboxylated PVDF membrane in vacuum, and immersing into a 2-methylimidazole solution to obtain the PVDF / MOFs / GO composite membrane. The compact and uniform MOFs composite material layer rapidly grows on the surface of the polyvinylidene fluoride membrane to prepare the MOFs composite membrane, and the MOFs composite membrane is used as an adsorption membrane to adsorb and separate organic matters or natural products in water, so that wastewater purification and organic matter extraction are realized.

The invention discloses a preparation method of high molecular weight waste rubber powder carboxylation modification and dynamic cross-linked rubber, and belongs to the technical field of high molecular weight waste rubber powder carboxylation modification and dynamic cross-linked rubber preparation. The preparation method comprises the following steps: S1, dispersing high-molecular-weight waste rubber powder in a solvent, adding acrylic acid and an initiator, and heating and stirring to obtain carboxylated waste rubber powder; s2, plastifying the matrix rubber on an open mill for roll coating, adding the carboxylated waste rubber powder in batches, and adding a cross-linking agent and an anti-aging agent at the same time to obtain masterbatch; s3, putting the master batch into an internal mixer, raising the temperature of the master batch to a preset dynamic crosslinking temperature, adding sulfur, an accelerant and other vulcanizing aids, and vulcanizing. Compared with the prior art, reversible chemical bonds can be formed at the interface of rubber powder particles and matrix rubber, and the chemical bonds can be temporarily broken during high-temperature processing and can be re-formed after cooling, so that the strength and the elasticity of the material are recovered.

The invention relates to the field of road asphalt, and discloses high-modulus modified asphalt for improving road performance and a preparation method thereof, the modified asphalt comprises matrix asphalt, coal liquefied asphalt, modified rubber seed oil, ethylene-vinyl acetate copolymer and modified carbon nanotubes; the modified rubber seed oil is prepared from epoxy rubber seed oil and a carboxylated flame-retardant component prepared by reaction of amino trimethylphosphonic acid, trimethylolpropane and malonic acid; the modified carbon nano tube is prepared from a toluene-2, 4-diisocyanate isocyanated carbon nano tube and an aminated modifier through a reaction; the amination modifier is prepared by performing acylating chlorination grafting on 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid by using thionyl chloride and then grafting with p-phenylenediamine. According to the invention, the coal liquefaction asphalt, the modified rubber seed oil, the ethylene-vinyl acetate copolymer and the modified carbon nanotube are added into the matrix asphalt; the high and low temperature performance, the flame retardant performance and the anti-aging performance of the asphalt material can be improved.

The invention relates to a method for synthesizing cyclic carbonate by catalyzing olefin oxidative carboxylation with a difunctional ionic liquid, which comprises the following steps: in a synthesis system, adding an oxidant and an additive into olefin serving as a raw material and the difunctional ionic liquid serving as a catalyst, and then carrying out epoxidation reaction; after the reaction is finished, potassium iodide and a carboxylation reagent are added into a reaction system, then cycloaddition reaction is performed, and finally cyclic carbonate can be prepared. The bifunctional ionic liquid is used as a catalyst, so that the olefin epoxidation reaction can be catalyzed, the cycloaddition reaction of an epoxide intermediate and CO2 can also be catalyzed, and the problem that a two-step reaction catalytic system is incompatible is solved. The adopted raw materials are cheap and easy to obtain, a metal-free catalyst is used, the method has the advantages of being economical and environmentally friendly, and an alternative scheme is provided for synthesis of cyclic carbonate.

The invention discloses a supramolecular hydrogel coating film reversibly adhering to frozen food and a production method and application thereof, belongs to the technical field of food packaging materials, and provides a production method of the supramolecular hydrogel coating film reversibly adhering to frozen food. The preparation method comprises the following steps: mixing 2, 3-dimethylaminopropyl-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide, and carrying out an ice bath reaction to obtain a carboxylation modified araboxylan solution; adding dopamine hydrochloride into the arabinoxylan, stirring, dialyzing and freeze-drying to obtain an arabinoxylan-dopamine graft; adding acrylic acid and metal ions into an ethanol water solution, mixing with the araboxylan-dopamine graft, stirring, mixing with N, N '-methylene bisacrylamide and ammonium persulfate, and polymerizing to obtain the supramolecular hydrogel covering film. The supramolecular hydrogel coating film has the characteristics of light-operated reversible adhesion, high mechanical strength and degradability, and is suitable for various frozen foods.

The invention relates to the field of polyester synthesis, and discloses a composite catalyst and application thereof in the synthesis of antimony-free polyester fiber. The invention firstly utilizes 5-carboxypentyl-triphenylphosphonium bromide to perform carboxyl modification on sodium montmorillonite, and simultaneously utilizes 1,5-naphthalenediamine, γ-ureapropyltriethoxysilane, terephthalaldehyde and DOPO as raw materials to synthesize component one, and reacts component one, 2-methylimidazole and zinc nitrate hexahydrate to prepare a flame retardant co-catalyst, and then reacts the flame retardant co-catalyst with carboxyl-modified montmorillonite to prepare functional modified montmorillonite, and finally uses the functional modified montmorillonite as a carrier and adopts a hydrothermal method to in-situ load titanium dioxide on the surface of the functional modified montmorillonite to synthesize the composite catalyst. The composite catalyst prepared by the invention shortens the polycondensation reaction time, improves the reaction efficiency, can improve the thermal stability, crystallization performance and flame retardancy of the synthesized polyester, and simultaneously improves the hue of the polyester.

The invention belongs to the technical field of tumor treatment, and particularly relates to a metal polyphenol network coated drug-loaded mesoporous organic silicon nanoparticle and a preparation method and application thereof.The mesoporous organic silicon nanoparticle (MON) is prepared through a micelle / precursor co-template assembly method, then amination modification, carboxylation modification and drug co-loading are further conducted on the mesoporous organic silicon nanoparticle (MON), and the metal polyphenol network coated drug-loaded mesoporous organic silicon nanoparticle is obtained. The DQMCTH nano-particles are prepared through the steps that DQMCTH nano-particles are taken as a raw material, a copper salt solution and a tannic acid (TA) solution are added and mixed, then a coordination complexation reaction is conducted, hyaluronic acid (HA) is added for modification, and the DQMCTH nano-particles obtained through the method are in a sphere-like shape, regular in shape, uniform in distribution and free of obvious dendritic branches and central radial pore channels. The polypeptide is effectively protected by MPN and is subjected to HA targeted modification; more importantly, the DQMCTH nanoparticles prepared by the method disclosed by the invention show pH / GSH / HAase triple sensitive drug release, and cell and animal experiment results show that the DQMCTH nanoparticles prepared by the method disclosed by the invention have relatively high anti-tumor activity on a drug-resistant breast cancer model.

The invention discloses an improved herbicide dicamba preparation method, and relates to the technical field of compound synthesis, the method comprises the following steps: using 2, 5-dichlorophenol as an initial raw material, heating 2, 5-dichlorophenol and a potassium hydroxide solution in an organic solvent to form salt, dehydrating and purifying, then carrying out carboxylation reaction with CO2 under the action of a catalyst, acidifying, distilling, and drying to obtain 3, 5-dichlorophenol; 2, 6-dichlorosalicylic acid is added; according to the method, 2, 3, 6-dichlorosalicylic acid and dimethyl sulfate are subjected to an etherification reaction, a hydrolysis reaction and an acidification reaction, and pure dicamba is obtained. The catalyst comprises K2CO3 and KCl, the purity of the obtained 3, 6-dichlorosalicylic acid is greatly improved, and the consumption of hydrochloric acid is remarkably reduced; according to the method, secondary reaction is adopted in the etherification process, so that 3, 6-dichlorosalicylic acid is completely converted into dicamba, and the product prepared by the method is high in yield, high in purity and relatively strong in controllability.

The application discloses a method for synthesizing nitrogen-containing heteroarene carboxylic acid compounds based on nitrogen-containing heteroarene carbon-hydrogen bond carboxylation reaction and belongs to the technical field of organic synthesis, and specifically comprises the following steps: adding a reaction substrate, an organic catalyst, a base and an additive into a reaction container, then adding a solvent under a CO2 atmosphere, and stirring and reacting at room temperature or under heating in a light irradiation condition; and performing post-treatment on a reaction product, separating and purifying the reaction product, and obtaining nitrogen-containing heteroarene carboxylic acid compounds and derivatives thereof. The scheme has the characteristics of mild reaction condition, wide reaction substrate range, good yield and good regioselectivity, and cheap and easily-obtained raw materials, can efficiently realize nitrogen-containing heteroarene carbon-hydrogen bond carboxylation reaction, synthesize important nitrogen-containing heteroarene carboxylic acid compounds, and has a good application prospect.