1190 results about "Aldehyde formation" patented technology

The invention belongs to the technical field of pervaporation membrane preparation and application, and relates to a covalent organic framework pervaporation hybrid membrane with a combination sequence regulation interlayer structure, in particular to preparation of the pervaporation membrane and application of the pervaporation membrane in water / butanol separation. Adding the aldehyde monomer solution into the amino monomer solution, and standing for reaction; taking a water phase, and carrying out dialysis treatment; diluting the covalent organic framework nanosheet dispersion liquid to obtain dispersion liquid A; adjusting the pH of a polyelectrolyte aqueous solution to obtain a solution B; adjusting the pH value of the metal ion dispersion liquid to obtain a solution C; uniformly mixing the dispersion liquid A and the solution C at normal temperature, adding the solution B, and heating for reaction to obtain a membrane casting liquid; and carrying out suction filtration on the membrane casting solution to a base membrane, and carrying out vacuum drying to obtain the pervaporation membrane. At 70 DEG C, the separation flux of a 10wt% / 90wt% water / butanol mixture is 7.52 g / (m < 2 > h), and the separation factor reaches 13709.

The invention provides a gas for plasma etching, a gas combination, an etching method and semiconductor equipment, which belong to the field of plasma etching, and are mainly characterized in that one or more of carbonyl halide, aldehyde halide and carboxyl halide are provided as process gases in the etching process to excite and form plasma, and the plasma is used as a plasma source. According to the method, the to-be-etched layer is etched, so that the problem of upper and lower inconsistency caused by large difference between the bottom etching rate and the middle etching rate when a high-aspect-ratio hole or groove is formed by etching to a certain degree is solved, the morphology of high-aspect-ratio etching is remarkably improved, the collimation is ensured, and the effectiveness of the semiconductor structure is improved.

The invention relates to the technical field of wastewater treatment, and discloses a preparation method of an activated carbon-containing adsorption material and application of the activated carbon-containing adsorption material in wastewater treatment.The preparation method comprises the steps that modified phenolic resin, activated carbon and sulfo chitosan are added into a double-screw extruder, and melt extrusion is performed to obtain the activated carbon-containing adsorption material; the phenolic resin is high in phenolic hydroxyl content and strong in hydrophilicity, has a good adsorption effect on chromium ions, lead ions and other heavy metal ions in wastewater, and has good adsorption energy on the heavy metal ions due to the coordination and hydrogen-bond interaction of amido in the phenolic resin, and flocculation is achieved through synergism; a sulfonic acid group and chromium ions, lead ions and other heavy metal ions in the wastewater are subjected to a complexation reaction to form tiny flocs, the tiny flocs and quaternary ammonium salt groups are electrically neutralized to form precipitates, the heavy metal ions are effectively removed, and the flocculation effect is achieved; meanwhile, chitosan is a natural antibacterial agent, and forms an antibacterial system with a quaternary ammonium salt group and a sulfonic acid group to achieve a synergistic antibacterial effect.

The invention provides a preparation method of a Cu-based catalyst for acetalation reaction, which comprises the following steps: depositing Pt on the surface of a pretreated carbon carrier through an atomic layer deposition method, depositing a metal oxide CuOx on the surface of the metal Pt, and performing high-temperature reduction and medium-temperature oxidation treatment to obtain the Cu-based catalyst. According to the method, the size of Pt particles and the thickness of CuOx can be accurately controlled on the atomic scale. The catalyst is applied to the acetalation reaction of aldol, the size of Pt particles and the thickness of CuOx can be accurately controlled on the atomic scale in the hydrogen atmosphere, the Pt-coated CuOx core-shell structure catalyst with cuprous as the main component is obtained on the surface of the carbon carrier, and the catalyst has the catalytic performance of high acetal yield due to the stable cuprous structure. The preparation of the catalyst is simple and controllable, and the greenization of the aldol acetalation reaction process and the high efficiency of the product are realized through the catalyst.

The invention relates to the technical field of polyurethane, and discloses a high-conductivity carbon nanotube modified polyurethane fiber membrane, which is characterized in that carbon nanotubes react with 1, 4-butanediamine to obtain aminated carbon nanotubes, 2, 4-toluene diisocynate reacts with polytetrahydrofuran ether glycol to form a polyurethane precursor, and the polyurethane precursor further reacts with 2, 2-dimethylolpropionic acid, 2, 2-dimethylolpropionic acid, 2, 2, 2-trimethyl-1, 3-pentanediol, 2, 2, 4-trimethyl-1, 3-pentanediol, 2, 2, 4-trimethyl-1, 3-pentanediol, 2, 2, 4-trimethyl-1, 3-pentanediol, 2 4-dihydroxyanisole reacts with N-methyldiethanolamine to obtain aldehyde polyurethane, the aldehyde polyurethane reacts with the aminated carbon nanotubes to finally obtain the composite fiber membrane, the interface bonding force of the carbon nanotubes and the polyurethane is enhanced through connection of chemical bonds, and when the composite fiber membrane is subjected to external force, stress passes through chemical cross-linking points, so that the composite fiber membrane is formed. The stress is transferred to the carbon nano tube from the polyurethane matrix, the carbon nano tube can absorb and transfer the stress, and the carbon nano tube can form a conductive network, so that the conductivity of the polyurethane is improved.

The invention provides an L-threonine aldolase mutant and application of the L-threonine aldolase mutant in catalytic synthesis of p-methylsulfonylphenylserine, the L-threonine aldolase mutant is derived from pseudomonas, threonine and p-methylsulfonylbenzaldehyde can be used as substrates, and the L-threonine aldolase mutant can be synthesized by using a one-step method. According to the present invention, L-threonine aldolase is adopted as a raw material, pyridoxal phosphate and reduced nicotinamide adenine dinucleotide are adopted as coenzymes, the synthesis of florfenicol intermediate product p-methylsulfonyl phenyl serine is obtained through catalysis, and compared with the wild type L-threonine aldolase, the mutant enzyme has high activity, can effectively improve the conversion efficiency, and can shorten the conversion time; the enzyme and the technical method provided by the invention have the advantages of mild reaction conditions and less pollution, and have good industrial prospects in the production of florfenicol synthesis intermediates.

The invention belongs to the field of petrochemical industry, and relates to a production method of isononyl alcohol and a production device of isononyl alcohol. The production method of the isononyl alcohol comprises the following steps: C8 olefin, synthesis gas and a catalyst enter a raw material reactor to react to obtain a hydroformylation reaction product, the hydroformylation reaction product enters a product separation unit to separate and remove by-products, and then the hydroformylation reaction product enters an aldehyde hydrogenation unit to react to obtain the isononyl alcohol. The invention has the following beneficial effects: the product separation unit removes most of non-condensable steam, light components and water through a low-vacuum flash evaporation-high-vacuum evaporation two-stage process, reduces the load of a high-vacuum system, and saves energy consumption; the circulation path of the catalyst is shortened through the efficient and rapid separation process of the catalyst, and decomposition of the catalyst is reduced; by applying the vacuum evaporator, low-pressure and low-temperature rapid separation of materials is achieved, the catalyst circulation process is short, the separation temperature is low, and meanwhile energy consumption is saved.

The invention belongs to the field of novel environment-friendly materials, and particularly relates to a modified covalent organic framework material for simultaneously adsorbing multiple heavy metal ions as well as a preparation method and application of the modified covalent organic framework material. The preparation method of the material comprises the following steps: dissolving 1, 3, 5-tri (4-aminophenyl) benzene and 2, 5-dihydroxy terephthalaldehyde in a mixed solvent, and standing and reacting at room temperature to obtain a mixed solution; adding scandium trifluoromethanesulfonate into the obtained mixed solution, carrying out standing reaction at room temperature, after the reaction is finished, separating insoluble substances from the reaction solution, and washing and drying the insoluble substances to obtain a covalent organic framework base material; a covalent organic framework base material prepared by adopting a neutral solution is subjected to ultrasonic modification treatment, and then the modified base material is washed and dried to obtain the modified covalent organic framework material. The material modified by the neutral solution shows a good adsorption effect on multiple heavy metal mixed ions in water, and has a good application prospect in the aspect of adsorbing and removing heavy metal ions in a water environment.

The invention discloses a cobalt-rhodium-doped nitrided activated carbon supported composite catalyst and a preparation method thereof, and application of the catalyst in preparation of aldehyde by catalyzing olefin, especially application of diisobutylene in preparation of isononanal. In the composite catalyst, the content of Rh is 0.2-1.5 wt% in terms of Rh atoms, the content of Co is 0.1-0.8 wt% in terms of Co atoms, the mass ratio of Co to Rh is 10: 1-1: 1, preferably 2: 1, and Co and Rh exist in the form of nanoclusters or monatomic atoms and are connected to a carbon nitride skeleton structure in the form of covalent bonds. According to the composite catalyst, the structure mainly comprises micropores and is provided with a small number of mesopores and macropores, the adsorption capacity of the material is enhanced, meanwhile, the material belongs to a heterogeneous catalytic material, the technical problem that the material is difficult to recycle is solved, cyclic utilization is facilitated, and the use cost is reduced. The catalyst can realize high-efficiency hydroformylation of diisobutylene to prepare isononanal, can be recycled and has an industrial application prospect in the aspect of olefin hydroformylation.

The invention relates to the field of copper-clad plates, and discloses a high-performance flame-retardant low-dielectric-loss copper-clad plate and a preparation method thereof.The copper-clad plate comprises epoxy resin, benzoxazine resin, composite filler, carboxyl-terminated nitrile rubber, an active diluent, a curing agent and the like; the composite filler is prepared by compounding flame-retardant modifier grafted graphene oxide and epoxy silane modified silicon dioxide hollow spheres; according to the flame-retardant modifier, boric acid and pentaerythritol are used for preparing a double-terminal hydroxyl boron-containing intermediate, then dichlorodiphenyl silane and phenylphosphonic dichloride react with hydroxyl groups at the two ends of the intermediate to prepare a flame-retardant intermediate, and amino silane and vanillic aldehyde react with chlorine atoms at the two ends of the intermediate to prepare an aldehyde modified flame-retardant intermediate; the copper-clad plate prepared by the preparation method disclosed by the invention is low in dielectric constant and dielectric loss, high in heat conductivity coefficient and good in flexibility, and also has excellent heat resistance and flame retardance.

A process for the production of methyl methacrylate is disclosed, the method comprising: a) producing methacrolein from propionaldehyde and formaldehyde; and b) reacting the methacrolein in an oxidative esterification reaction to obtain methyl methacrylate. Reacting the methacrolein in an oxidative esterification reaction comprises introducing a reaction mixture comprising the methacrolein, methanol, and an oxygen-containing gas to a reactor system comprising a heterogeneous noble metal-containing catalyst. A liquid phase stream exiting the reactor system contains at least 30 wt % methanol based on the total weight of the liquid phase stream. The liquid phase stream exiting the reactor system contains less than 30 wt % methacrolein based on the total weight of the liquid phase stream. The liquid phase stream exiting the reactor system comprises greater than 0.1 ppm and less than 5000 ppm methyl isobutyrate. A gas phase stream exiting the reactor system comprises between 1 mol % and 7.5 mol % oxygen based on the total amount of the gas phase stream.

The invention discloses a nitrogen-containing carbon hollow sphere supported cobalt-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. According to the preparation method, ammonia water, tetraethyl orthosilicate, polyoxyethylene polyoxypropylene ether triblock copolymer, resorcinol and a formaldehyde solution are fully reacted in a mixed solvent of deionized water and ethanol by virtue of a template method, and the nitrogen-containing carbon hollow spheres are obtained after calcination and etching; then carrying out surface modification on the nitrogen-containing carbon hollow spheres, and uniformly loading cobalt metal by virtue of the structure guiding effect of hexamethyleneimine and sodium citrate dehydrate; the prepared nitrogen-containing carbon hollow sphere supported cobalt-based catalyst has abundant highly-exposed Co-N-C active sites, has wide substrate universality, has good catalytic activity and selectivity for amination reactions with various long-chain fatty aldehydes, fatty ketones, cyclic fatty ketones, aromatic aldehydes and ketones as raw materials, and can realize efficient catalytic amination reactions of carbonyl compounds.

The invention relates to modified polyamide particles as well as a preparation method and application thereof, and belongs to the technical field of polyamide particles. The modified polyamide particle comprises the following components: polyamide resin, a modified composite filler, a compatibilizer, an antioxidant and a lubricant. The preparation method comprises the following steps: banburying and mixing the polyamide resin, the compatibilizer, the antioxidant and the lubricant, adding the mixture into a double-screw extruder from a main feeding port, adding the modified composite filler from a side feeding port, and carrying out melt extrusion, cooling and pelletizing to obtain the modified polyamide particles. Zirconium oxide is generated on glass fibers, more silane coupling agents are grafted in combination with a tetramethylammonium hydroxide and ethidene diamine compound catalyst, the interface bonding force between the composite filler and polyamide is increased, the surface of the composite filler is modified through syringaldehyde, the compatibility with a polyamide system is increased, and meanwhile, the composite filler can be used for preparing the composite filler. The modified polyamide particles can react with acid anhydride in a styrene-maleic anhydride copolymer, and the mechanical strength of the modified polyamide particles can be improved.

Provided herein are processes for preparing Compound A or a salt thereof, comprising admixing Compound B or a salt thereof and crotonaldehyde in the presence of an acid catalyst and a solvent to form Compound A

Various processes for the pyrolysis of carbohydrates to prepare products such as glycolaldehyde are described. Also, various catalysts and processes for preparing catalysts useful for carbohydrate pyrolysis are described.

The invention provides a triazine covalent organic framework film as well as a preparation method and application thereof. A preparation method of a triazine covalent organic framework membrane comprises the following steps: (1) soaking and washing a polyacrylonitrile ultrafiltration membrane in a strong alkali solution to obtain a pretreated ultrafiltration membrane; (2) soaking the pretreated ultrafiltration membrane in a 2-morpholine ethanesulfonic acid buffer solution containing N-hydroxysuccinimide and 1-ethyl-(3-dimethylaminopropyl) carbodiimide, and washing with water to obtain an activated ultrafiltration membrane; (3) soaking the activated ultrafiltration membrane in a first organic phase solution of a polyamine monomer and 1, 4-dioxane, and washing with water; soaking in a second organic phase solution of a polyaldehyde monomer and 1, 4-dioxane to obtain a modified ultrafiltration membrane; and (4) immersing the modified ultrafiltration membrane into a mixed solution composed of a polyamine monomer, a polyaldehyde monomer, acetic acid and 1, 4-dioxane, and cleaning to obtain the triazine covalent organic framework membrane. The triazine covalent organic framework membrane provided by the invention has good separation performance and catalytic oxidation performance.

The invention provides a method for in-situ preparation of a covalent organic framework mixed matrix membrane. The method mainly comprises the following steps: dissolving a film-forming polymer, a pore-forming agent and an aldehyde monomer in a solvent, stirring and heating to prepare a film casting solution; dissolving an amino monomer in water to prepare a coagulating bath; a glass plate is coated with the membrane casting solution to form a liquid membrane, the liquid membrane is immersed in a coagulating bath, in the process, macromolecules are separated out to form a membrane, and an amino monomer in the coagulating bath reacts with an aldehyde group monomer in the membrane casting solution to form an amorphous macromolecular network; and putting the membrane into a solvent added with a catalyst, and heating to obtain the covalent organic framework mixed matrix membrane. The method mainly has the advantages that the amido monomer and the aldehyde group monomer are respectively added into the coagulating bath and the membrane casting solution, so that the reaction process of the two monomers is matched with the precipitation process of the polymer matrix, and the synergistic reinforcement of the periodic nanopores of the covalent organic framework filler and the excellent membrane forming property of the polymer matrix is realized.

The invention discloses a preparation method and application of active cationic chitosan nanoparticles, which comprises the following steps: reacting a low-molecular chitosan triethylamine hydrogen sulfate ionic liquid ([(C2H5) 3NH] HSO4) solution with an aldehyde compound ethanol solution to form Schiff base protection on chitosan C2-site amino, and then reacting with 2, 3, 5, 6-tetramethyl-4-piperidine-2-one to obtain the active cationic chitosan nanoparticles. The preparation method comprises the following steps: carrying out nucleophilic substitution reaction on chitosan C6 in the presence of a basic catalyst by using 2, 3-epoxypropyl trimethyl ammonium chloride, then adding a chemical initiator, carrying out grafting reaction on chitosan C3 and acrylic acid, and then removing Schiff base protection on chitosan C2. Carboxylate anions of acrylic acid and cations of chitosan are subjected to cross-linking self-assembly through a hydrothermal reaction, and the chitosan nanoparticles which are high in stability, small in particle size, uniform in distribution and efficient and lasting in function are obtained. The prepared nanoparticles are high in reaction activity, contain a large amount of quaternary ammonium salt, amino dication groups and carboxyl groups, and have wide application prospects in the fields of dye adsorption, heavy metal adsorption, textile function finishing and the like.

The invention relates to a preparation method of oxygen vacancy-containing bismuth vanadate BiVO4-OVs or metal bismuth-loaded bismuth vanadate xBi0 / BiVO4. The preparation method comprises the following steps: weighing bismuth nitrate pentahydrate and ammonium metavanadate according to a molar ratio of bismuth nitrate pentahydrate to ammonium metavanadate of 1: 1 + x; the preparation method comprises the following steps: respectively dissolving bismuth nitrate pentahydrate and ammonium metavanadate in a solvent, fully mixing the bismuth nitrate pentahydrate and the ammonium metavanadate, adjusting the pH value of the solution, placing a reaction system in an environment of 140-180 DEG C for reaction, washing and drying a product, and roasting under the protection of argon to obtain the product. In addition, the invention also discloses an application of the bismuth vanadate BiVO4-OVs containing oxygen vacancies or the bismuth vanadate xBi0 / BiVO4 loaded with metal bismuth as a catalyst in preparation of benzaldehyde by photocatalytic oxygen oxidation of cinnamyl aldehyde. According to the method, the utilization rate of cinnamyl aldehyde can be increased, efficient oxidation can be achieved in the initial stage of reaction, good benzaldehyde selectivity can be achieved, and the adopted catalyst is efficient and non-toxic and has no influence on the naturalness of benzaldehyde.

The invention belongs to the technical field of artificial board manufacturing, and particularly relates to a formaldehyde-free adhesive as well as a preparation method and application thereof, raw materials for preparing the formaldehyde-free adhesive comprise a flowable agent and a filling agent, and the formaldehyde-free adhesive is obtained by combining the raw materials through molecular acting force among the raw materials. The formaldehyde-free adhesive has the advantages of being high in bonding strength, stable in physical and chemical properties and not prone to deterioration, epoxy groups and carboxyl or anhydride groups in the formaldehyde-free adhesive can be directly reacted and coupled with groups on the surfaces of biomass fibers, the surface polarity of the formaldehyde-free adhesive after curing is large, the acting force between the formaldehyde-free adhesive and the biomass fibers is strong, and the formaldehyde-free adhesive is not prone to deterioration. The formaldehyde-free adhesive is high in strength after being cured; in addition, the formaldehyde-free adhesive subjected to complete curing reaction still has reversibility, the formaldehyde-free adhesive can be re-melted after being heated again, leftover materials generated by cutting in the later period of plate making can be subjected to hot pressing plate making without adding glue, secondary utilization of artificial plate waste is facilitated, resources are saved, and the environment is protected.

The invention relates to the technical field of automobile air purification, and particularly discloses a filtering material, a preparation method of the filtering material and a novel automobile air conditioner multi-effect catalytic formaldehyde removal filter. The filtering material comprises a PET (Polyethylene Terephthalate) supporting layer, a gas filtering layer and a PP (Polypropylene) electrostatic filtering layer which are arranged in sequence, the gas filtering layer is prepared from the following raw materials in parts by weight: 30 to 90 parts of activated carbon and 10 to 70 parts of manganese catalyst. The gas filtering layer composed of the activated carbon and the manganese catalyst is matched with the filtering material composed of the PET supporting layer and the PP electrostatic filtering layer, four gases of n-butane, methylbenzene, sulfur dioxide and nitrogen dioxide can be adsorbed, the manganese catalyst degrades formaldehyde at normal temperature, meanwhile, the reaction on the formaldehyde is a catalytic reaction, and the environment-friendly effect is achieved. Therefore, the filter material disclosed by the invention also has longer service life, so that a filter made of the filter material has a better formaldehyde removal effect and longer service life.

The invention provides a deuterium-labeled 3-indoleacrylic acid isotope compound and a preparation method thereof, and relates to the technical field of plant hormone detection, deuterated toluene is creatively nitrated and subjected to a ring closing reaction, then an aldehyde group is introduced, and finally hydrolysis is performed to obtain the target product deuterium-labeled 3-indoleacrylic acid isotope compound. The preparation method provided by the invention is strong in operability, relatively good in atom economy and excellent in reproducibility and stability, the isotope abundance of the prepared deuterium-labeled 3-indoleacrylic acid isotope compound can reach 98% or above, the chemical purity is 98% or above, and the deuterium-labeled 3-indoleacrylic acid isotope compound can be used as an internal standard substance for detecting plant hormones and has good application prospects. The method has important practical application value.

The invention provides an alpha, beta unsubstituted 1, 4-ketoaldehyde compound and a metal-free photocatalytic aqueous solution acetaldehyde alpha-position selective single alkylation reaction preparation method and application thereof, a photosensitizer and alpha bromine / chloro aryl ethyl ketone are mixed in an organic solvent, then TEEDA, nBu4NI and an acetaldehyde aqueous solution are sequentially added, white light irradiation stirring reaction, separation and purification are performed, and the alpha, beta unsubstituted 1, 4-ketoaldehyde compound is obtained. Compared with the prior art, the method has the advantages that by improving the light source, the reaction can be amplified to the gram scale level, the yield of the corresponding alpha and beta unsubstituted 1, 4-ketoaldehyde product is not obviously reduced, and a basis is provided for the industrialization process of the reaction. The reaction disclosed by the invention has the characteristics of wide substrate range, high functional group tolerance, simplicity in operation, mild reaction conditions and the like. Moreover, the product disclosed by the invention can be subjected to reductive amination with cyclic secondary amine to obtain a series of gamma-aminoketones with biological activity, which shows that the reaction has potential synthesis application value in the field of pharmaceuticals.

The invention provides a preparation method of a formaldehyde-free veneer artificial board, which comprises the following steps: (1) an adhesive is applied to the surface of a veneer, the adhesive is composed of a part A and a part B. The part A is one or more of isocyanate or modified isocyanate, or a mixture of the isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate; the part B is a hydroxyl-terminated compound or a mixture of the hydroxyl-terminated compound, a catalyst and one or more of sulfolane, preferably, the glue applying amount of the part B in different layers of veneers is different, and the applying amount is gradually increased from the surface layer veneer to the core layer veneer; (2) forming a plate blank by the veneers according to a certain rule; and (3) feeding the plate blank into a hot press to prepare the formaldehyde-free added veneer type artificial board. The method for producing the formaldehyde-free veneer type artificial board is simple and easy in process, high in hot-pressing production efficiency, excellent in mechanical property, good in flatness and low in warping degree, and can resist boiling in boiling water for 72 hours.

The invention discloses a strong-stain-resistant radiation refrigeration coating and a preparation method thereof, and relates to the field of radiation refrigeration, in particular to the strong-stain-resistant radiation refrigeration coating and the preparation method thereof. The invention aims to solve the technical problem of poor radiation refrigeration effect caused by poor weather resistance, water resistance, stain resistance and color retention of the existing radiation refrigeration coating. The radiation refrigeration coating with strong stain resistance is mainly composed of a filler and modified water-based aldehyde ketone resin. The coating prepared by the invention has strong stain resistance, stable and lasting high sunlight reflectance and atmospheric window emissivity, more importantly, the coating prepared by the invention has low surface energy after forming a film, has high water resistance and self-stain resistance, really realizes that pollutants cannot be attached, and has no pollution to the environment. The radiation refrigeration device can be applied to a relatively severe environment to realize long-term stable radiation refrigeration, and has an ideal application prospect in the fields of energy sources, aerospace and buildings with harsh requirements.

The invention relates to a low-ice-adhesion super-hydrophobic anti-icing coating as well as a preparation method and application thereof. Single-end amino fluorosilicone oil is grafted to the surface of an aldehyde group functionalized metal organic framework material through an amino-aldehyde group condensation reaction to obtain a hydrophobically modified metal organic framework material, the hydrophobically modified metal organic framework material is compounded with a synthesized fluorinated acrylate copolymer, and the coating is prepared through ultrasonic dispersion and spraying curing processes. According to the prepared low-ice-adhesion super-hydrophobic anti-icing coating, through the synergistic effect of fluorosilane grafting modification and a micro-nano structure, the excellent performance that the static water contact angle is larger than or equal to 160 degrees, the rolling angle is smaller than or equal to 2 degrees, and the ice adhesion strength is smaller than or equal to 20 kPa is achieved. Compared with a traditional anti-icing coating, a metal organic framework material functional modification strategy is adopted, the ice adhesion force is remarkably reduced while the mechanical stability of the coating is kept, and uniform film forming on the surfaces of base materials such as aluminum wires can be achieved through the spraying technology. The coating is suitable for anti-icing protection of the aluminum conductor of the power transmission line, and has the characteristics of long-acting icing resistance and low ice adhesion.

The invention belongs to the technical field of covalent organic framework membrane materials, and provides a covalent organic framework / polyether sulfone mixed matrix membrane as well as a preparation method and application thereof. The method comprises the following steps: mixing polyether sulfone, a solvent and trialdehyde phloroglucinol to obtain a trialdehyde phloroglucinol solution; the glass fiber filter membrane is coated with the trialdehyde phloroglucinol solution, and a trialdehyde phloroglucinol / polyether sulfone membrane is obtained; the method comprises the following steps: mixing p-phenylenediamine, a catalyst and water to obtain a p-phenylenediamine solution; the trialdehyde phloroglucinol / polyether sulfone membrane is soaked in a p-phenylenediamine solution for a reaction, and the covalent organic framework / polyether sulfone mixed matrix membrane is obtained. The preparation method disclosed by the invention is mild in condition, the obtained membrane is uniform and stable, the advantages of high flux of a polymer and strong adsorption and separation of a covalent organic framework on CO2 are fully combined, and the H2 flux and H2 / CO2 selectivity of the covalent organic framework / polyether sulfone mixed matrix membrane are greatly improved.

The present invention discloses a titanium dioxide / manganese dioxide / carbon composite catalyst supported on a macroscopic carrier, a preparation method thereof and an application. The preparation process is as follows: titanium dioxide is added to deionized water, stirred, potassium permanganate is added, and stirring is continued; a carbon source is added, after stirring evenly, a macroscopic carrier is added, ultrasonic mixing is carried out, and reaction is carried out under water bath conditions. After the reaction is completed, it is cooled and dried to obtain the product. Compared with the existing formaldehyde removal materials, through the mutual synergistic effect among the components of the composite catalyst in the present invention, that is, the photo-thermal synergistic catalytic oxidation under light conditions and the adsorption / catalytic oxidation under dark conditions act together to mineralize formaldehyde into environmentally harmless water and carbon dioxide. In addition, the preparation method of the present invention has a simple operation process and low raw material prices. Combining the support on a macroscopic carrier and the synergistic effect among the composite catalysts, it has the characteristics of a wide range of applicable scenarios, convenient subsequent recovery, and all-weather formaldehyde removal, and has broad application prospects.

The invention provides a preparation method of modified zinc oxide nanoparticles as well as a product and application thereof, the preparation method comprises two steps of solvothermal reaction and surface modification, combines the advantages of chemical reaction formaldehyde removal of organic amine substances and photocatalytic degradation formaldehyde removal of inorganic nanoparticles, and has the characteristic of efficient formaldehyde removal. Siloxane groups on the surfaces of the modified zinc oxide nanoparticles effectively improve the hydrophobicity of the surfaces of the zinc oxide nanoparticles, and prevent dust in air from being attached to damage the formaldehyde removal performance, so that the formaldehyde removal function is played for a long time.

The invention discloses a synthesis method of methyl 4-formylbutyrate, and belongs to the technical field of chemical synthesis, methyl acrylate and nitromethane are subjected to a Michael addition reaction under the action of a catalyst to prepare methyl 4-nitrobutyrate, and the excessive undissolved catalyst can be recycled after being filtered; the method comprises the following steps: under the action of sodium tert-butoxide and potassium permanganate, carrying out hydrolytic oxidation reaction on methyl 4-nitrobutyrate, adding a sodium hydrogen sulfite aqueous solution and a sulfuric acid solution after the reaction is completed, consuming excessive potassium permanganate oxidant, reducing by-products, and carrying out purification treatment to obtain high-purity methyl 4-formyl butyrate. The synthesis method provided by the invention has the advantages of cheap and easily available raw materials, simple operation, easily controllable conditions, high total yield and easy realization of industrial production.