1115 results about "Formic Aldehyde" patented technology

The invention relates to a crown ether covalent organic framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a crown ether monomer and an amino monomer in an o-dichlorobenzene solvent, adding a catalyst acetic acid aqueous solution, and uniformly dispersing to form a reaction solution; the method comprises the following steps: freezing a reaction solution through a liquid nitrogen bath, vacuumizing, filling nitrogen, carrying out a heating reaction, and carrying out post-treatment operations such as washing and drying on a reaction product, so as to obtain the crown ether covalent organic framework material BADT-DB18C6-COF. The crown ether covalent organic framework material is formed by condensation of a crown ether aldehyde monomer and an amino monomer, the crown ether monomer is 4, 4 ', 4' ', 4 '''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde, and the crown ether monomer is 4, 4 ', 4' ', 4'''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde. The amino monomer is 4 ', 5'-bis (4-aminophenyl)-[1, 1 ': 2', 1 ''-terphenyl]-4, 4''-diamine. The crown ether covalent organic framework material BADT-DB18C6-COF prepared by the invention is mainly used as an adsorbent, is used for adsorbing and recovering uranium, thorium and americium ions from a solution, shows good adsorption capacity on radionuclides U-238, Th-232 and Am-243, and is particularly suitable for the field of spent fuel post-treatment in the nuclear industry.

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

The invention relates to the technical field of materials and advanced oxidation, and discloses a covalent organic framework catalyst with a benzothiadiazole structure, a preparation method of the covalent organic framework catalyst and application of the covalent organic framework catalyst in peroxymonosulfate (PMS) activation and organic pollutant degradation. The preparation method of the covalent organic framework catalyst comprises the following steps: adding precursors 1, 3, 6, 8-tetra-(p-aminophenyl)-pyrene and 2, 7-dibenzaldehyde-benzothiadiazole into a mixed solvent composed of o-dichlorobenzene and n-butyl alcohol, carrying out a reaction by using acetic acid as a catalyst through a solvothermal method, and after the reaction, carrying out multiple times of centrifugal washing and drying to obtain the covalent organic framework catalyst. The catalyst shows excellent performance in the aspect of activating PMS to degrade organic pollutants, the degradation rate constant of bisphenol A reaches 1.68 min <-1 >, and 100% removal can be achieved within 5 minutes. Meanwhile, the catalyst has the advantages of no secondary pollution, strong anti-interference performance, reusability and the like. Compared with a traditional method, the catalyst has high PMS activation efficiency, the catalysis process is energy-saving and environment-friendly, the operation is simple and convenient, the preparation process is simple and feasible, and a new solution is provided for efficient degradation of organic pollutants in water.

The invention discloses a phenanthridine-6-formaldehyde derivative and a preparation method and application thereof.The preparation method comprises the steps that 2, 4, 5, 6-tetra (9-carbazolyl)-isophthalonitrile serves as a photocatalyst, 1-azabicyclo [2.2. 2] octane serves as a hydrogen atom transfer catalyst, a biphenyl isocyanide compound, the photocatalyst, the hydrogen atom transfer catalyst and an alkali additive are jointly dissolved in 1, 3-dioxolane, the mixture is stirred to be uniform, and the phenanthridine-6-formaldehyde derivative is obtained. And carrying out free radical tandem cyclization and acid-catalyzed hydrolysis reaction to obtain the phenanthridine-6-formaldehyde derivative. The invention also provides a specific reaction equation. According to the developed synthesis method of the phenanthridine-6-formaldehyde derivative, the compound can be efficiently and conveniently prepared, the technical bottlenecks of harsh reaction conditions and tedious steps in a traditional process are successfully overcome, raw materials which are low in price and easy to obtain are adopted, operation is carried out under mild conditions, the synthesis method has the outstanding advantages of being high in yield, safe and simple to operate, environmentally friendly and the like, and the method is suitable for industrial production. Good industrial application potential is shown.

The invention discloses a covalent organic framework with oxidation-reduction activity and a bionic nano-channel structure as well as a preparation method and application of the covalent organic framework, and belongs to the technical field of environmental protection. According to the preparation method, 2, 4-dihydroxybenzene-1, 3, 5-tricarboxaldehyde and 2, 5-bis (allyloxy) terephthaloyl hydrazine are taken as raw materials, a two-dimensional covalent organic framework with oxidation-reduction activity is synthesized, and then a sulfonic acid group with negative charges is covalently grafted, so that a functional material with a bionic nano-channel structure is formed. The material has regular porous channels and rich functional sites, the porous channels provide efficient mass transfer paths and adsorption spaces for uranyl ions, and the functional sites realize specific recognition of the uranyl ions through oxidation-reduction reaction and electrostatic interaction, so that the material shows synergistic advantages of strong selectivity, high adsorption capacity and rapid adsorption kinetics on uranium. The method is simple and low in cost, and the prepared material is clear in structure, good in hydrophilicity, capable of efficiently adsorbing uranyl ions and good in application prospect.

The invention relates to preparation of a crystalline allyl covalent organic framework material and application research of the crystalline allyl covalent organic framework material in benzamide cyclization green photocatalytic conversion. The SF-COF material is prepared by adopting a step-by-step synthesis method. The preparation method comprises the following steps: synthesizing a COF precursor by taking 1, 3-benzenetricarboxaldehyde and p-aminophenylacetonitrile as raw materials, and preparing the allylation covalent organic framework material with the electronic push-pull effect from the COF precursor and 5, 5 ', 5'-(benzene-1, 3, 5-triyl) tri (thiophene-2-formaldehyde) through a solvothermal method. The material is applied to the field of photocatalytic organic conversion, and benzamide cyclization and conversion of derivatives of benzamide are achieved under irradiation of a blue light LED. The prepared SF-COF has the advantages of efficient charge separation and electron conduction performance, good structural stability and chemical stability and the like. And a catalyzed organic reaction substrate has the advantages of wide universality range, good cycle stability and the like, and shows excellent photocatalytic conversion capability.

The invention relates to a non-noble metal-based paired electro-catalysis method for producing formic acid by coupling cathode dehalogenation with anode formaldehyde oxidation, which realizes efficient dehalogenation removal of pollutants and generation of high-value products. The Co-CuxO nanowire electrode with excellent catalytic performance is synthesized through a simple method and serves as a cathode and an anode at the same time, and the purpose that the cathode removes halogenated pollutants and the anode oxidizes formaldehyde to produce formic acid at the same time is achieved. Co-CuxO promotes generation of H *, the performance of electroreduction dehalogenation is improved, and the removal rate of trichloroacetic acid can reach 92.1% or above. And moreover, the reaction energy barrier is reduced, the selectivity of formic acid generated by oxidizing anode formaldehyde is improved, and the formic acid selectivity and Faraday efficiency can reach 100%. A paired electro-catalysis system shows extremely stable and outstanding electro-catalysis performance in the aspect of converting wastes into value-added products, and the problems of poor anode utilization rate and high energy consumption in the current electro-catalysis dehalogenation reaction are solved.

The invention discloses a covalent organic framework material based on a boric acid structure, a preparation method of the covalent organic framework material and application of the covalent organic framework material in dopamine detection, and relates to a covalent organic framework material and a preparation method and application of the covalent organic framework material. The technical problems that an existing dopamine recognition method is high in detection limit and harsh in recognition environment are solved. The periodic structure fragment of the covalent organic framework material based on the boric acid structure is shown in the specification. The 2-(4-boric acid phenyl)-5, 10-dinitro-1H-phenanthro [9, 10-d] imidazole diamine and 4, 4 ', 4', 4 ''-(pyrene-1, 3, 6, 8-tetrayl) tetrabenzaldehyde are subjected to a reaction to obtain the 2-(4-boric acid phenyl)-5, 10-dinitro-1H-phenanthro [9, 10-d] imidazole diamine derivative. The covalent organic framework material based on the boric acid structure is used for detecting dopamine, has relatively high selectivity and anti-interference capability, and is not interfered by amino acid in the environment. And the covalent organic framework material based on the boric acid structure can be embedded in the hydrogel, so that the hydrogel is convenient to carry. The method can be applied to detection of dopamine in environment and biological systems.

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.

A method of carbon dioxide fixation includes contacting a covalent organic framework material with a co-catalyst and an epoxide in the presence of carbon dioxide to form a cyclic carbonate. The covalent organic framework material includes reacted units of a 2,4,6-trimethyl-1,3,5-triazine, reacted units of a 4,4′-biphenyldicarbaldehyde, and palladium nanoparticles. The reacted units of the 2,4,6-trimethyl-1,3,5-triazine and the reacted units of the 4,4′-biphenyldicarbaldehyde form a COF-701, where the palladium nanoparticles are on an outer surface of the COF-701. The co-catalyst is n-tetrabutylammonium bromide.

A method for preparing compound 1 and compound 2 having a structure as shown below, the method includes the following steps:1) subjecting 2,3-dihydrobenzofuran-7-amine as a raw material to a selective-dibromination with a brominating reagent to obtain 4,6-dibromo-2,3-dihydrobenzofuran-7-amine;2) subjecting 4,6-dibromo-2,3-dihydrobenzofuran-7-amine obtained in the step 1) to Sandmeyer reaction for chlorination to obtain 4,6-dibromo-7-chloro-2,3-dihydrobenzofuran;3-1) selectively debrominating from 4,6-dibromo-7-chloro-2,3-dihydrobenzofuran obtained in the step 2) using a strong base, and then adding a formylation reagent to obtain compound 1;3-2) selectively debrominating from 4,6-dibromo-7-chloro-2,3-dihydrobenzofuran obtained in the step 2) using a strong base, and then reacting with 4-cyclopropyl benzaldehyde to obtain compound 2.

The invention belongs to the technical field of epoxy resin, and particularly relates to double-dynamic-bond synergistic exchange epoxy resin as well as a preparation method and application thereof. The preparation method of the double dynamic bond synergistic exchange epoxy resin comprises the following steps: adding aromatic dialdehyde and amino-containing disulfide into a solvent for condensation reaction, and filtering and drying to obtain a double dynamic bond curing agent; the preparation method comprises the following steps: adding the double-dynamic-bond curing agent into epoxy resin, carrying out ring-opening addition reaction, carrying out gradient heating curing, and cooling to room temperature, the aromatic dialdehyde is terephthalaldehyde, isophthalaldehyde or o-phthalaldehyde, and the amino-containing disulfide is 2, 2 '-diaminodiphenyl disulfide or 4, 4'-diaminodiphenyl disulfide. The invention designs and synthesizes a double-dynamic covalent bond curing agent containing an imine bond and a disulfide bond, and is used for constructing a novel degradable and self-healing epoxy resin. The material maintains good thermal stability and insulation performance, and realizes degradation and self-healing functions at the same time.

The invention relates to the technical field of organic high-molecular compounds, and discloses a carbon black-containing polyurethane-based foaming composite material and a preparation method thereof. The preparation method of the carbon black-containing polyurethane-based foaming composite material comprises the following steps: reacting p-aminobenzaldehyde with phosphoric acid to generate a phosphorus-containing compound, and introducing barium ions to obtain a modified phosphorus-containing compound; reacting the modified phosphorus-containing compound with the polyhydroxy esterification product to obtain flame-retardant polyol; modifying polyethylene glycol by a nitrogen-containing compound to obtain modified polyethylene glycol; the preparation method comprises the following steps: adding modified polyethylene glycol, flame-retardant polyol and modified carbon black into a polyurethane system to prepare a polyurethane foam material; introducing a silicon dioxide aerogel layer on the surface of the polyurethane foaming material to obtain a polyurethane-based foaming composite material containing carbon black; the carbon black-containing polyurethane-based foaming composite material disclosed by the invention has excellent flame retardant property, antistatic property and mechanical property.

The invention relates to the field of benzoxazine, in particular to modified benzoxazine resin and a preparation method and application thereof.The preparation method of the modified benzoxazine resin comprises the following steps that S1, first-stage reaction is conducted, specifically, an alkane amine compound, formaldehyde and an organic solvent are stirred to be uniform and heated to react; the alkane amine type compound is one or more of short aliphatic chain amine, alicyclic polyamine and a monoamine type compound; s2, second-stage reaction: adding a phenolic compound containing unsaturated alkyl, and heating for reaction; s3, heating, and removing small molecular impurities and by-products under negative pressure to obtain the modified benzoxazine resin, the modified benzoxazine resin and the preparation method and application thereof solve the problem that the existing benzoxazine resin is insufficient in storage stability and processing performance while improving the dielectric property.

The invention discloses a carbamoyl-substituted diarylethene derivative as well as a preparation method and application thereof, and the preparation method comprises the following steps: reacting R-substituted 3-bromo-2-hydroxybenzaldehyde with an arylmethyl triphenylphosphonium bromide compound or an aryl acetic acid compound to obtain an intermediate A; then the intermediate A and cuprous cyanide are subjected to a heating reaction in N, N-dimethylformamide and nitrogen atmosphere, and an intermediate B is obtained; and finally, heating the intermediate B, acetaldoxime and indium trichloride in toluene for reaction to obtain the carbamoyl-substituted diarylethene derivative. The carbamoyl-substituted diarylethene derivative disclosed by the invention has a remarkable effect in an in-vitro anti-tumor activity test, particularly has excellent anti-proliferation ability to human BRCA mutant tumor cells, and can be used for preparing medicines for treating PARP-1 activity abnormity related diseases. The synthesis route is simple, the cost is low, and large-scale implementation is facilitated.

The invention belongs to the technical field of high-molecular polymers, and particularly relates to glyoxal modified polyacrylamide and a synthesis method thereof. Comprising the following steps: adding sulphaguanidine and 4-vinyl benzaldehyde into a solvent for reflux to obtain a compound 1; the preparation method comprises the following steps: adding acrylamide and methacryloyloxyethyl trimethyl ammonium chloride into water, adding into the hydrolysate of 1, 3-dimethoxy-1, 3-dimethyl-1, 3-divinyl disiloxane, and adding an ammonium persulfate solution for reaction to obtain a mixed solution; adding an acetone solution of a compound 1 into the mixed solution, and adding an ammonium persulfate solution to react to obtain cationic polyacrylamide; the cationic polyacrylamide and glyoxal are stored separately, and are mixed and reacted during use to obtain glyoxal modified polyacrylamide. According to the invention, early crosslinking of glyoxal and a polymer is avoided, the paper strength can be obviously improved, and the product can show excellent stability in the storage process.

The invention belongs to the technical field of microbial fermentation and insect pest prevention and control, and particularly relates to endogenous bacillus velezensis and application of fermentation liquor of the endogenous bacillus velezensis in prevention and control of bemisia tabaci. The invention discloses bacillus velezensis NM153 which is preserved in the China Center for Type Culture Collection on March 27, 2025, and the preservation number of the bacillus velezensis NM153 is CCTCC (China Center for Type Culture Collection) M 2025605. A stock solution of the bacillus velezensis NM153 supernate and the bacterial suspension is diluted by 300 times and 500 times to treat the bemisia tabaci, and the result shows that the death rate of the bemisia tabaci treated by the bacillus velezensis NM153 supernate is obviously higher than that of a bacterial suspension treatment group, and the death rate of the bemisia tabaci treated by the bacterial suspension treatment group is obviously higher than that of the bemisia tabaci treated by the bacillus velezensis NM153. In addition, the bacillus velezensis NM153 metabolite is further verified and explained to have a remarkable technical effect on preventing and treating bemisia tabaci in o-carboxybenzaldehyde, tenuitoxin and micronomicin in the bacillus velezensis NM153 metabolite.

The invention relates to the technical field of preparation of catalytic materials, in particular to a preparation method of a manganese dioxide room-temperature catalyst, which comprises the following steps: dissolving a manganese-containing soluble salt in deionized water to form a solution A; adding an oxidizing agent F into the solution A to form a mixed solution B; s3, carrying out hydrothermal reaction on the mixed solution B to obtain a reaction product; washing the reaction product for multiple times, centrifuging, precipitating and drying to obtain a sample; and calcining the sample to obtain the manganese dioxide catalyst. According to the preparation method of the manganese dioxide room-temperature catalyst, the manganese dioxide phase structure is accurately regulated and controlled, and the manganese dioxide synthesized by the method for regulating and controlling the phase structure has high specific surface area and rich oxygen vacancies; meanwhile, accumulation of intermediate products such as formic acid and CO is effectively inhibited through high-density distribution of defect sites, and the formaldehyde removal rate at the room temperature (25 DEG C) can reach 90% or above.

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.

A cosmetic preparation containing 4-Hydroxy-3-methoxybenzaldehyde (INCI: vanillin), 4-(tert-butyl)-4'-methoxydibenzoylmethane (INCI: butyl methoxydibenzoylmethane) and di(propylene glycol) dibenzoate (INCI: dipropylene glycol dibenzoate).

The invention relates to the technical field of organic catalysis, in particular to a method for preparing glycolaldehyde by catalyzing formaldehyde hydroformylation. The method comprises the following steps: introducing CO and H2 into a mixed solution of paraformaldehyde, a rhodium compound, a ligand and a solvent, and reacting to prepare glycolaldehyde, the ligands comprise a ligand 1 and a ligand 2; the ligand 1 is selected from one or more of compounds as shown in the following L1-L8: # imgabs0 #; the structural formula of the ligand 1 is as shown in the specification, the structural formula of the ligand 2 is as shown in the specification, namely # imgabs1 # or # imgabs2 #, R1 is H, (CH2) ACH3, O-(CH2) ACH3, X or CX3, the value range of A is 0-3, and X is a halogen atom. According to the method disclosed by the invention, different ligands are subjected to dominant combination and cooperate with the rhodium-based catalyst, so that glycolaldehyde is obtained with high conversion rate and high selectivity under relatively mild conditions.

The invention discloses a preparation method and application of a fluorinated amino covalent organic framework adsorption material, and relates to the technical field of covalent organic framework materials. According to the preparation method, 2, 4, 6,-tri (4-aminophenyl)-1, 3, 5-triazine is adopted as a point monomer, 2, 3, 5, 6-tetrafluorop-dibenzaldehyde and 2, 5-divinyl-1, 4-phthalaldehyde are adopted as side monomers, and the fluorinated covalent organic framework adsorption material is obtained through reaction; and carrying out post-modification reaction on the fluorinated amino covalent organic framework by adopting cysteamine hydrochloride to obtain the fluorinated amino covalent organic framework adsorption material. The prepared fluorinated amino covalent organic framework adsorption material has high selective adsorption and high adsorption capacity on PFAS, and due to the characteristics, the material has excellent adsorption performance on PFAS in water.

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 discloses an acid and alkali resistant fiber and a preparation method thereof, and relates to the field of fiber fabrics. When the acid and alkali resistant fiber is prepared, dimethyl terephthalate, polyethylene glycol-2000, ethylene glycol, 1, 3-bis (3-hydroxypropyl)-1, 1, 3, 3-tetramethyldisiloxane and diethyl phosphite are polymerized and then react with 4-vinyl benzoyl chloride and 2-mercaptobenzothiazole in sequence, and modified polyester is prepared; the preparation method comprises the following steps: sequentially reacting microcrystalline cellulose with 3-(chloromethyl)-2-hydroxybenzaldehyde, 4-allylthiosemicarbazide and copper chloride to prepare modified cellulose; the modified cellulose and the modified polyester are mixed and subjected to melt spinning, then perfluoroethylene is used for after-finishing, and the acid and alkali resistant fiber is prepared. The acid and alkali resistant fiber prepared by the invention has durable, flame-retardant and antibacterial capabilities.

The invention discloses a flame-retardant corrosion-resistant coating and a preparation method thereof, and relates to the technical field of fluorocarbon resin powder coatings. The flame-retardant corrosion-resistant coating comprises the following raw materials in parts by weight: 15-25 parts of fluorocarbon resin, 40-50 parts of epoxy resin, 3-5 parts of a curing agent, 5-7 parts of a reinforcing agent, 4-6 parts of a corrosion inhibitor, 6-8 parts of filler, 1-2 parts of a flatting agent and 0.5-1 part of benzoin. The preparation method comprises the following steps: reacting phosphonitrilic chloride trimer with p-hydroxybenzaldehyde to generate an intermediate 1, reacting the intermediate 1 with p-aminobenzoic acid to generate an intermediate 2, and reacting the intermediate 2 with 2-heptyl ethylene oxide to generate the reinforcing agent. The flame-retardant corrosion-resistant coating prepared by the invention has excellent mechanical properties, corrosion resistance, aging resistance and flame retardance.

The invention belongs to the technical field of sensor materials and malathion detection, and relates to a nano-silver modified covalent organic framework composite material, a preparation method and application thereof, and an electrochemical aptamer sensor. The preparation method comprises the following steps: S1, dissolving 1, 3, 5-tri (4-aminophenyl) benzene and 2, 5-divinyl-1, 4-phthalaldehyde in acetonitrile, adding a catalyst to carry out condensation reaction, standing, separating, washing and drying to obtain a covalent organic framework material; s2, dispersing the covalent organic framework material and silver nitrate in water, adding sodium citrate after ultrasonic dispersion, and washing and drying to obtain the nano-silver modified covalent organic framework composite material. The nano-silver modified covalent organic framework composite material prepared by the invention shows excellent crystallinity, extremely high porosity and good conductivity, and realizes high-sensitivity, rapid and accurate quantitative analysis of malathion in traditional Chinese medicinal materials.

The invention provides a chemical or enzymic method regenerated PET and PTA screening method, which comprises the following steps: pretreating a PET or PTA sample 1, and measuring the content of p-toluic acid, the content of p-carboxybenzaldehyde and the content of m-terephthalic acid by using high performance liquid chromatography; the method comprises the following steps: pretreating a PET or PTA sample 2, pretreating by using a high-temperature pyrolysis method, and measuring an isotope ratio of oxygen-18 to oxygen-16 by using an isotope ratio mass spectrometer; the method comprises the following steps: calculating a cleanliness index, an oxy-18 index and a bottle flake index by using a formula based on a test result, and classifying PET and PTA samples through a decision tree according to the indexes; combining and mixing the PET and PTA products based on the classification result and the requirements of downstream customers on the regeneration method and the regenerated material content; the method is convenient, accurate and reliable, the classification result is objective, the screening efficiency of PET and PTA regenerated by a chemical or enzyme method can be improved, and the economic cost is saved.

The invention provides a bio-based crude terephthalic acid hydrofining method, and belongs to the technical field of terephthalic acid hydrofining. The method comprises the following steps: carrying out recrystallization pretreatment on bio-based crude terephthalic acid, mixing the pretreated bio-based crude terephthalic acid with a solvent, adding a catalyst, carrying out a hydrofining reaction, replacing the solvent after the reaction is finished, carrying out recrystallization treatment on a hydrofined product, washing with water, and drying to obtain refined terephthalic acid, the method disclosed by the invention has the advantages of high impurity removal rate, mild reaction conditions and small process pollution, the refining of the bio-based crude terephthalic acid is realized, the obtained terephthalic acid can meet the requirements of an existing industrial method, and the concentration of impurities p-carboxybenzaldehyde is less than or equal to 25ppm and the concentration of methyl benzoic acid is less than or equal to 180ppm.

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 preparation method of a post-metallocene catalyst. The method comprises the following steps: by taking quinoline 2-formaldehyde and ortho-aminophenol as raw materials, carrying out reflux reaction on the raw materials and a first solvent to prepare a ligand; dispersing a metal chloride in a second solvent, adding a Grignard reagent, and carrying out a reaction at a low temperature to prepare a methylated metal reagent; and adding a ligand into the methylated metal reagent, reacting at room temperature for 10-12 hours, removing liquid in vacuum, adding part of the second solvent again, stirring, filtering after the product is dissolved, and recrystallizing the filtrate to obtain the product, the metallocene catalyst is obtained by firstly preparing the ligand, then preparing the methylated metal reagent, adding the ligand into the methylated metal reagent for reaction, then stirring by using the second solvent, filtering after the product is dissolved, and recrystallizing the filtrate, so that the operation steps are simple, and the preparation of the ligand does not need water-oxygen treatment operation, and is simple and easy to implement; the preparation cost of the post-metallocene catalyst is reduced, and the method is suitable for industrial large-scale production.