90 results about "Pyromellitic acid" patented technology

The invention relates to the technical field of three-dimensional porous framework crystal materials, in particular to a Zn-MOF microporous crystal material, a preparation method thereof and application of the Zn-MOF microporous crystal material in gas separation. The molecular formula of the Zn-MOF microporous crystal material is [Zn2 (PMA) (TPB)]. XH2O, PMA is deprotonated 1, 2, 4, 5-pyromellitic acid, TPB is 1, 2, 4, 5-(4-pyridyl) benzene, the Zn-MOF microporous crystal material is formed by coordination of Zn, an oxygen atom of the 1, 2, 4, 5-pyromellitic acid and an N atom of the 1, 2, 4, 5-(4-pyridyl) benzene, and the Zn-MOF microporous crystal material has a three-dimensional frame structure. The Zn-MOF microporous crystal material can be applied to the field of ethylene separation and purification.

The invention discloses a preparation method of a pyromellitic acid-terminated polyethylene glycol monomethyl ether concrete viscosity reducer, and belongs to the technical field of concrete materials and concrete admixtures. The preparation method of the pyromellitic acid-terminated polyethylene glycol monomethyl ether concrete viscosity reducer comprises the following steps: mixing pyromellitic anhydride and polyethylene glycol monomethyl ether, and carrying out esterification reaction to obtain the pyromellitic acid-terminated polyethylene glycol monomethyl ether material. According to the invention, the esterification reaction is a reaction between pyromellitic dianhydride with two anhydrides with strong electron withdrawing effects and methoxypolyethylene glycol with nucleophilic hydroxyl groups; the acid anhydride activity of the first reaction of the pyromellitic dianhydride is higher than that of the second reaction of the pyromellitic dianhydride, so that the pyromellitic dianhydride can generate the monoester product with high selectivity, the reaction efficiency is higher, the chemical stability of the monoester product is good, and fewer byproducts are generated.

The invention discloses Pseudomonas putida, a bacterial agent thereof and an application of the Pseudomonas putida in chemical wastewater treatment, the Pseudomonas putida is named as PH-20 and preserved in the China General Microbiological Culture Collection Center on March 17, 2025, and the preservation number of the strain is CGMCC No. 33831. The invention further discloses a preparation method of the Pseudomonas putida. The pseudomonas putida disclosed by the invention can be used for rapidly degrading polybenzoic acid such as terephthalic acid, phthalic acid, isophthalic acid, trimellitic acid, trimellitic acid and pyromellitic acid in wastewater under the conditions of high salt and low temperature, and the degradation effect is still excellent under the condition that various pollutants coexist.

The invention relates to the technical field of OLED (Organic Light Emitting Diode) manufacturing process etching processes, in particular to a silver etching solution for an OLED manufacturing process as well as a preparation method and application of the silver etching solution. The silver etching liquid comprises nitric acid, phosphoric acid, a buffer agent, a metal ion chelating agent and an ionic liquid inhibitor, the ionic liquid inhibitor comprises 1-butyl-3-methylimidazole phosphate, the metal ion chelating agent is selected from at least one of pyromellitic acid, diethylenetriamine pentaacetic acid and ethylenediamine tetramethylene phosphoric acid, and the buffer agent is selected from at least one of sodium chloride, sodium chloride and sodium chloride. The buffering agent comprises acetic acid, and all the components are prepared according to a specific mass ratio. The etching solution can balance the etching rate of silver and indium tin oxide, avoid silver residues and black spot defects, prolong the service life of the solution, reduce the use of a volatile buffer agent, adapt to the OLED fine manufacturing process, improve the product yield and reduce the production cost, and is suitable for etching of a metal substrate in the OLED manufacturing process.

The invention aims to provide a preparation method and application of a catalyst containing vacancy cluster ultrathin CeO2 nanosheets, and belongs to the technical field of catalyst preparation.The preparation method comprises the steps that cerium nitrate hexahydrate is used as a cerium source, pyromellitic acid is used as a ligand, deionized water is used as a solvent, polyvinylpyrrolidone is used as a surface active agent, and the vacancy cluster ultrathin CeO2 nanosheets are prepared; preparing a two-dimensional Ce-MOFs precursor at 70 DEG C by adopting a simple hydrothermal method; secondly, the two-dimensional Ce-MOFs precursor is roasted for 5 h in the air atmosphere, and the vacancy cluster ultrathin CeO2 nanosheet containing catalyst is obtained. The catalyst containing the vacancy cluster ultrathin CeO2 nanosheets has a remarkable influence on the activity of catalyzing CO2 / CH3OH to prepare dimethyl carbonate, and a new research idea is provided for preparation of an efficient cerium-based catalyst and synthesis of dimethyl carbonate.

The invention belongs to the field of polyvinyl alcohol composite films, and particularly relates to a preparation method of a high-performance hydrophobic polyvinyl alcohol composite film. By adopting the ternary composite plasticizer, the hydrogen-bond interaction in PVA molecules can be destroyed, the crystallinity and the melting point of PVA are reduced, and the plasticizing effect on PVA is remarkable. Compared with a single plasticizer and a binary plasticizer, the PVA film modified by the ternary composite plasticizer is good in hydrophobicity and excellent in mechanical property. The PVA film is modified by adopting a chemical cross-linking mode, the hydroxyl in PVA molecules is masked through esterification reaction of pyromellitic acid and hydroxyl of PVA, cross-linking can be realized, the hydrophobic property of PVA can be improved, and the mechanical property of the PVA film can also be improved.

The invention relates to a fluoro-ligand regulated metal organic framework material and a preparation method and application thereof, the fluoro-ligand regulated metal organic framework material is prepared and synthesized by using zirconium oxychloride as a metal node and trimesic acid / 5-fluoroisophthalic acid as an organic ligand through a reflux method; the unit structural formula of the fluorinated ligand metal organic framework material is [Zr6O4 (OH) 4 (BTC) 2-x (F-BTC) x (AA) y (H2O) z], according to the preparation method, trimesic acid and part of 5-fluoroisophthalic acid are co-coordinated, a C-F bond is introduced to regulate and control the electronic environment around a Zr node through deletion of a connecting site, uniform nucleation of crystals is promoted, the grain size of the obtained material is remarkably reduced, and the dispersity is higher.

The invention discloses a preparation method and application of a dual-channel multifunctional multicolor fluorescent probe, and relates to the technical field of fluorescent sensing detection.The dual-channel multifunctional multicolor fluorescent probe is prepared through the following steps that pyromellitic acid and ZrCl4 solids are dispersed in deionized water, Zr-MOF is prepared through a hydrothermal method, pamoic acid and melamine are dispersed in deionized water, and the Zr-MOF is prepared through a hydrothermal method; the preparation method comprises the following steps: preparing green fluorescent carbon dots (CDs) by using a hydrothermal method, dispersing the CDs and Zr-MOF in deionized water according to a certain proportion, reacting, collecting a brown solid, washing, drying, dispersing the solid in ethanol, adjusting the pH to be alkaline, adding Eu (NO3) 3.6 H2O, reacting, filtering, and drying in vacuum to obtain a target probe. The probe can accurately distinguish Cu < 2 + > ions of tetracycline antibiotics (TCs) through two independent fluorescent channels, not only displays completely independent spectral response, but also has the advantages of self-calibration, high sensitivity, interference resistance, field visual detection and the like. The multifunctional fluorescent probe has important significance for improving detection efficiency, reducing cost and energy consumption, optimizing resource utilization and promoting green low-carbon economy.

The invention relates to the technical field of sodium ion batteries, and discloses a preparation method of a sodium battery additive and application of the sodium battery additive in a sodium battery, and the preparation method comprises the following steps: a) a reaction step: in an isopropanol solvent, enabling pyromellitic acid and sodium hydroxide to react under heating and stirring; after the reaction is finished, filtering a reaction product to obtain a benzene tetracarboxylic acid sodium crude product; b) a purification step: dissolving the benzene tetracarboxylic acid sodium crude product in water, and heating for rotary evaporation until the solution reaches a saturated state; adding methanol into the solution in the saturated state to separate out a solid, and filtering a mixture containing the solid while the mixture is hot; and carrying out vacuum drying on the solid obtained by filtering to obtain the sodium electric additive. According to the invention, the high-purity product is used as the sodium-ion battery additive, and the comprehensive performances of high-temperature circulation, high magnification, low temperature and the like of the battery can be comprehensively and obviously improved through a unique mechanism of synchronously forming a stable protective film on a positive electrode and a negative electrode.

The invention discloses tetraisononyl pyromellitate as well as a preparation method and application thereof. The tetraisononyl pyromellitate is obtained by carrying out esterification reaction on pyromellitic acid or pyromellitic anhydride and isononyl alcohol under the action of a catalyst. The raw materials used in the synthesis process of the tetraisononyl pyromellitic acid are safe, the cost is low, the synthesis procedures and steps are simple, and the synthesis method is suitable for industrial processing and production. The trioctyl trimellitate plasticizer can be used as one of substitutes of the trioctyl trimellitate TOTM plasticizer, and even is a better improved product.

The present application relates to a method for liquid phase oxidation of durene, which comprises: a first stage, in the presence of a catalyst, with acetic acid as a solvent, a liquid phase oxidation reaction of an oxidant source and durene to produce an intermediate mixture, the catalyst containing Co salt, Mn salt, Zr salt and bromide compound; a second stage, adding a mixture of bromide and pure water to the intermediate mixture, and continuing the oxidation reaction with the oxidant source to produce pyromellitic acid; wherein the concentration of oxidant in the oxidant source of the first stage is lower than the concentration of oxidant in the oxidant source of the second stage. By controlling the concentration of oxidant in the oxidant source of the first stage to be lower than the concentration of oxidant in the oxidant source of the second stage in the liquid phase oxidation process of durene, the yield of pyromellitic acid and the purity of crude pyromellitic acid are significantly improved.

The application provides a preparation method of high-purity pyromellitic dianhydride, which is prepared from 2,3-dichloromaleic anhydride as raw material, and sequentially subjected to Diels-Alder cycloaddition reaction, elimination reaction and oxidation reaction to obtain high-purity pyromellitic acid, and then subjected to dehydration treatment to obtain high-purity pyromellitic dianhydride. In the preparation method, pyromellitic acid is used as a dehydration raw material to prepare anhydride, so that intermediate acid by-products are not easy to be generated, and the product purity is improved; the dehydration reaction is promoted by adopting azeotropic distillation and separation coupling, so that the reaction yield is improved; the preparation steps are few, the reaction process is simple, the reaction condition is mild, the raw materials are economically inexpensive and easy to obtain; the catalyst or the aid used in each step does not generate harmful substances, and is green and environment-friendly.

The utility model relates to the technical field of related equipment for preparing pyromellitic acid, in particular to a rapid vaporization device for preparing pyromellitic acid, which comprises a base main body, a processing box is fixedly mounted at the top end of the base main body, and a driving structure is fixedly mounted at the top end of the processing box. A control panel is fixedly mounted on the side, close to the driving structure, of the top end of the processing box, a first mounting ring is fixedly connected to one end of the driving structure, a second mounting ring is fixedly connected to the other end of the driving structure, a material conveying opening is formed in the outer side of the processing box, and a connecting rod is fixedly connected to the top end of the inner wall of the processing box; according to the processing box, the driving structure, the control panel, the first cleaning block, the second cleaning block, the partition plate and the sealing ring are arranged, so that the processing box is convenient to clean, and the practicability is enhanced.

The invention belongs to the technical field of energy materials, and discloses a preparation method of a zinc-based porous organic polymer coating and application of the zinc-based porous organic polymer coating to protection of a zinc negative electrode. Reaction raw materials of the zinc-based porous organic polymer provided by the invention are cheap soluble zinc salt and pyromellitic acid, and the zinc-based porous organic polymer is obtained through a one-step solvothermal reaction. Polyvinylidene fluoride (PVDF) is adopted as a binder, and Zn-POPs is loaded on the surface of the zinc negative electrode in the modes of spin coating, blade coating, spray coating and the like. According to the Zn-POPs protective coating provided by the invention, the concentration distribution of zinc ions on an interface can be dynamically regulated and controlled by an unsaturated coordinate bond, and a dendrite-free zinc negative electrode is realized. Meanwhile, the coating can isolate direct contact between the electrolyte and the negative electrode, so that corrosion of the zinc negative electrode and generation of byproducts are reduced; when the coating is applied to a symmetric battery and a total battery, the battery can show low polarization voltage and stable cycle performance, the advantages of the coating are further highlighted, and subsequent large-scale industrial production can be expected.

The invention discloses an isooctyl / isononyl / isodecyl pyromellitic acid plasticizer composition as well as a preparation method and application thereof, and the isooctyl / isononyl / isodecyl pyromellitic acid plasticizer composition is prepared from pyromellitic acid or pyromellitic anhydride, isooctyl alcohol (A), isononyl alcohol (B) and isodecyl alcohol (C) through esterification reaction, the molar ratio of the pyromellitic acid or the pyromellitic anhydride to the total alcohol is 1: (4-5); the molar ratio of the isooctyl alcohol (A) to the isononyl alcohol (B) to the isodecyl alcohol (C) is (0-5): (0-5): (0-5). The raw materials used in the synthesis process of the isooctyl / isononyl / isodecyl pyromellitic acid plasticizer composition are safe, the cost is low, the synthesis process is simple, and the isooctyl / isononyl / isodecyl pyromellitic acid plasticizer composition is suitable for industrial processing and production and has excellent heat resistance and low precipitation performance.

The present invention discloses a Ru-M@Al-MCM-41 catalyst and its preparation method and application. The present invention uses microspherical Al-MCM-41 as a carrier, confines the active component Ru and the auxiliary component M in the molecular sieve pores by strong electrostatic adsorption, and then reduces to obtain the Ru-M@Al-MCM-41 catalyst; the catalyst morphology is porous spherical. The Ru-M@Al-MCM-41 catalyst of the present invention has high activity and high stability and has good industrial application prospects. The catalyst of the present invention is used to catalyze the hydrogenation of pyromellitic acid esters to prepare hydrogenated pyromellitic acid esters, and the conversion rate of the substrate pyromellitic acid ester is high, and the selectivity of the target product hydrogenated pyromellitic acid ester is high.

This invention provides a carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst, its preparation method, and its application, belonging to the field of photocatalytic materials technology. First, a carbon nitride precursor and a carboxylating agent are mixed in a solvent to undergo a carboxylation reaction, yielding carboxylated graphitic carbon nitride. Then, the carboxylated graphitic carbon nitride is mixed with a copper salt solution for a preliminary reaction, yielding copper-supported C3N4-C powder. Finally, the copper-supported C3N4-C powder and 1,3,5-pyromellitic acid are dispersed in a solvent for a hydrothermal reaction to obtain the carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst. This invention, through directional assembly and growth, ultimately obtains a composite photocatalyst with tight interfacial bonding, stable structure, and high photogenerated charge separation efficiency.

The invention relates to the technical field of adsorption materials, in particular to a preparation method and application of a zirconium-based metal organic framework composite sodium alginate material, zirconium ions serve as a metal core, two ligands including pyromellitic acid and 2, 5-dihydroxy terephthalic acid are added, double-ligand MOFsUiO-66-(OH) 2 / (COOH) 2 is synthesized, then the double-ligand MOFsUiO-66-(OH) 2 / (COOH) 2 is compounded with sodium alginate (SA), and the zirconium-based metal organic framework composite sodium alginate material is obtained. The porous composite material SA (at) UiO-66-(OH) 2 / (COOH) 2 is obtained. The UiO-66-(OH) 2 / (COOH) 2 and SA are rich in-OH and-COOH, so that the chelating ability of the UiO-66-(OH) 2 / (COOH) 2 and SA on heavy metals is further enhanced, and the adsorption effect of the composite material on Pb < 2 + > is enhanced. The low-price composite material provides reference and thought for adsorption of metal ions in an actual water sample on site.

The purpose of this invention is to synthesize a carbon dot-based nanozyme and its cascade detection application. Using ascorbic acid and 1,3,5-pyromellitic acid as raw materials, ethylenediamine as a nitrogen dopant, and ferric chloride as a metal source, a one-step microwave synthesis method is employed in a microwave reactor (glass material). This method solves the problem of high energy consumption caused by the need for high temperature, high pressure, or long reaction time in existing technologies. Characterization and analysis of its morphology, structure, and properties revealed that the prepared iron-nitrogen co-doped carbon dot-based nanozyme consists of two-dimensional spherical carbon nanoparticles with excellent Fe-N... x The active site exhibits POD-like enzyme activity, with catalytic activity exceeding that of most reported nanozymes. Furthermore, this invention synergistically utilizes its peroxidase-like catalytic activity and photodynamic effect to significantly enhance reactive oxygen species (ROS) generation, achieving highly sensitive detection of organophosphorus pesticides and significantly reducing their detection limits. This synergistic strategy provides a new approach for expanding the application of nanomaterials in chemical analysis and sensing.

The invention provides a preparation method of pyromellitic acid based on a modified catalyst, and belongs to the technical field of pyromellitic acid materials, and the preparation method comprises the following steps: adding a pore-forming agent, an aluminum salt and a template in the process of preparing titanium dioxide by a sol-gel method, carrying out hydrolysis to obtain gel, standing, aging, drying and calcining to form particles; and dipping in a vanadium-tungsten mixed solution to form a precursor solution, loading the precursor solution on an inert carrier, and roasting to obtain the modified catalyst. Filling a gas phase oxidation reaction fixed bed with the modified catalyst, introducing a durene and air mixture, and carrying out catalytic oxidation, hydrolysis, filtration, crystallization, separation and drying to obtain the pyromellitic acid. The prepared catalyst is high in catalytic activity and good in thermal stability and is used for preparing pyromellitic acid, and the obtained product is high in yield and good in purity.

The present application discloses an ammonia sensor based on a copper ion organic framework and a preparation method thereof, the method comprising: plasma cleaning a glass substrate with an indium tin oxide interdigital electrode for 6 minutes; adding a copper nitrate solution to the glass substrate with the indium tin oxide interdigital electrode to obtain a first solution; spraying a pyromellitic acid solution containing methanol onto the first solution, and a transparent film appears on the surface of the solution; then taking out the excess solution with a syringe, and then drying it under vacuum conditions at 80°C for 2 hours to completely remove the residual solvent, thereby obtaining an NH3 sensor based on an ion-conducting metal copper ion-organic framework. The sensor of the present application exhibits an excellent linear response to NH3, and has high sensitivity, good selectivity and fast response / recovery time, and solves the problems of low sensitivity, poor stability, expensive equipment, and cumbersome preparation process that most gas sensors have.

The invention relates to the technical field of polypropylene, and discloses a high-toughness pressure-resistant composite plastic and a preparation process thereof.The high-toughness pressure-resistant composite plastic is prepared by taking pyromellitic anhydride as a central core to react with diallylamine to obtain pyromellitic tetraallylamine, and then modifying with mercaptopropyltriethoxysilane modified nano titanium dioxide to obtain the high-toughness pressure-resistant composite plastic. The preparation method comprises the following steps: synthesizing a multi-nano titanium dioxide dendritic compound, and carrying out melt blending by taking the multi-nano titanium dioxide dendritic compound as a dispersion phase and polypropylene as a matrix to prepare the high-toughness pressure-resistant composite plastic. According to the invention, the multi-nano titanium dioxide dendritic compound is used as a dispersion phase and is dispersed in polypropylene, the toughness and pressure resistance of the polypropylene plastic are enhanced by utilizing nano titanium dioxide and a large number of branched chain structures contained in the multi-nano titanium dioxide dendritic compound, and the composite plastic prepared by the invention has relatively high toughness and pressure resistance.

The present application relates to the technical fields of organic chemical synthesis, and discloses a method for synthesizing pyromellitic acid. The method comprises the following steps: (1) under gas-liquid reaction conditions, contacting liquid-phase materials containing durene, a solvent and a catalyst with an oxygen-containing gas in a micro-channel reactor to perform first oxidation, so as to obtain first oxidation materials, wherein the conditions of the first oxidation are such that the conversion rate of the durene reaches more than 99%, and the total molar amount of a monocarboxyl product, a dicarboxyl product and an intermediate product of the oxidation of the monocarboxyl product to the dicarboxyl product in the first oxidation materials is more than 85% of the molar amount of the first oxidation materials; and (2) sending the first oxidation materials into a reaction kettle to perform second oxidation. The method for synthesizing pyromellitic acid provided by the present application has the advantages of high yield, good selectivity, low possibility of blockage of the micro-channel reactor, high oxidation efficiency, safe reaction, economy and environmental protection.

This invention discloses a method for preparing a Zr-MOF-NH2 defluorinating agent and its application in the treatment of fluoride-containing wastewater, specifically relating to the field of deep defluorination technology. The method involves preparing a precursor solution by adding 1,3,5-pyromellitic acid, 5-aminoisophthalic acid, and concentrated hydrochloric acid to a mixed solution of acetic acid and water. ZrOCl2·8H2O is then added and the mixture is heated under reflux. After centrifugation, washing with organic solvents, and vacuum drying, a zirconium-based metal-organic framework defluorinating agent with –NH2 functional groups is obtained. This defluorinating agent exhibits strong affinity and high adsorption capacity for fluoride ions, demonstrates good defluorination performance over a wide pH range, and can reduce the fluoride ion concentration in actual fluoride-containing wastewater to a low level. It also boasts advantages such as simple process, mild conditions, good continuous operation performance, and suitability for engineering applications.

The invention relates to a carbon nanotube loaded tantalum monatomic doped bismuth sulfide catalyst as well as a preparation method and application thereof, and aims to solve the problems that the yield of H2O2 prepared through electro-catalysis of an existing bismuth-based catalyst is relatively low, and the selectivity of H2O2 is relatively low. The preparation method comprises the following steps: 1, dispersing trimesic acid, tantalum pentachloride and bismuth nitrate pentahydrate in methanol, and carrying out solvothermal reaction at 110-140 DEG C to obtain a tantalum-doped bismuth metal organic framework material; 2, grinding and mixing the tantalum-doped bismuth metal organic framework material and dibenzyl disulfide to obtain a mixture; and 3, in an argon atmosphere, heating to 750-950 DEG C, and carrying out heat preservation carbonization treatment. The bismuth sulfide catalyst prepared by the method shows H2O2 selectivity of more than 90% in a wide voltage range of 0-0.65 V, and the H2O2 yield can reach 8.76 mol.g <-1 >. H <-1 > under the industrial-grade current density of 75 mA / cm < 2 >.

The present application relates to the technical field of high polymer materials, and particularly relates to a preparation method of wear-resistant / low-dielectric PTFE composite material based on interface functionalization. Ammonia / hydrogen mixed gas is used to perform low-temperature plasma treatment on PTFE powder; then the activated PTFE powder is dispersed in an aqueous solution containing ammonium perfluorooctanoate and 4-dimethylamino pyridine; then an organic phase of pyromellitic acid dichloride and an aqueous phase of 4,4'-diamino diphenyl ether are synchronously added dropwise to implement in-situ interface polymerization on the surface of PTFE particles to generate a polyamide acid ammonium salt coating layer; finally, through programmed temperature rising, the coating layer is converted into polyimide, and under the action of hot pressing, a composite material with PTFE as a matrix and a three-dimensional network of polyimide nanofibers penetrating through the inside is formed. The interface bonding force between the reinforcing phase and the PTFE matrix is significantly enhanced, so that the composite material simultaneously has excellent wear resistance, low dielectric constant, high mechanical strength and thermal stability.

The application discloses a europium functionalized metal-organic framework double-emission fluorescent probe and a preparation method and application thereof, relates to the field of organic metal frameworks and fluorescent detection, and the preparation method comprises the following steps: mixing ZrCl4, pyromellitic acid, 6-hydroxy-2-naphthoic acid and water, adding acetic acid to obtain a mixture; the mixture is heated to reflux, centrifuged to obtain a residue, washed and dried to obtain UCHNA; the UCHNA is dispersed in an aqueous solution of Eu(NO3)3.6H2O, heated to react, the white precipitate is collected, washed and dried, and the Eu-MOF is obtained. 3+ The application has the beneficial effect that a luminescent ligand 6-hydroxy-2-naphthoic acid is used to modify a UiO-66 type MOF, and Eu 3+ -MOF is synthesized through post-modification and reasonable design, and the Eu-MOF can selectively and rapidly respond to crystal violet (CV) and quinine (QN) through different response modes, and has a low detection limit, which is superior to most reported sensors.

The invention belongs to the technical field of metal surface treatment, and discloses a formation agent and a preparation method and application thereof. The formation agent comprises phosphoric acid, nitric acid, zinc dihydrogen phosphate, nickel salt, manganese salt, zinc salt, composite organic acid and a solvent, the composite organic acid comprises citric acid, tartaric acid and pyromellitic acid; the zinc salt does not comprise zinc dihydrogen phosphate. The formation agent is a low-temperature formation agent, a compact protective film layer can be formed on the metal surface under the low-temperature condition such as 15-35 DEG C, and the protective film layer has good corrosion resistance. When the paint film coating is subjected to electrophoresis on the surface of the protective film layer, the protective film layer and the paint film coating have good bonding strength.

The present invention relates to a preparation method of an acrylic copolymer composite ZrMOF aerogel fertilizer slow-release material, which comprises the following steps: (1) dissolving a zirconium salt and pyromellitic acid in a mixed solvent at room temperature, subsequently adding concentrated HCl, and reacting after ultrasonic dissolution; after the reaction product is cooled to room temperature, centrifugation, washing, and drying overnight to obtain a mesoporous ZrMOF powder; (2) uniformly mixing the mesoporous ZrMOF powder with nitrogen fertilizer and distilled water to obtain a ZrMOF / nitrogen fertilizer mixed solution; (3) adding the ZrMOF / nitrogen fertilizer mixed solution and a polysaccharide natural polymer to a container in sequence and stirring at room temperature; simultaneously adding a water-soluble initiator, an acrylic acid monomer mixed solution, and a cross-linking agent aqueous solution from different bottle openings; after stirring the reaction, the product is washed and freeze-dried to obtain an acrylic copolymer composite ZrMOF aerogel fertilizer slow-release material. The present invention has a simple process, readily available raw materials, low cost, mild preparation conditions, and the obtained material is eco-friendly, safe, and reliable, and can be applied to the agricultural field, especially in arid and semi-arid areas.

A viologen coordination compound crystal and a preparation method thereof, wherein the structural formula of the crystal is shown in formula (I): wherein BTC is pyromellitic acid. The present invention uses viologen molecules (Bcnbpy·2Cl) as a guest and the oxygen atom of the carboxyl group of pyromellitic acid as an electron donor to provide a multifunctional color-changing material that can respond to ultraviolet light and blue light and also has an organic amine-induced color-changing function. The preparation method of the present invention has non-toxic raw materials, a simple method, no pollutant emissions, and is suitable for large-scale production.