133 results about "Metal ion sequestering" patented technology

The invention relates to the technical field of cleaning agents, and discloses a biodegradable environment-friendly cleaning agent, which comprises: a composite surfactant system comprising at least one nonionic surfactant, an ampholytic surfactant and a chelating functional surfactant; the plant extract oil system comprises limonene and a eucalyptus oil mixture; the functional particle system comprises nanoscale enzyme microcapsules and slow-release type oxidized particles; the natural polysaccharide stable network system comprises at least two polysaccharide thickeners and a bio-based cross-linking agent, and the assistant system comprises a metal ion chelating agent, a buffer acid system and water. By introducing sodium polyaspartate as a green chelating surfactant, efficient chelating of calcium and magnesium ions under a hard water condition is realized, the cleaning power is remarkably improved, water stain residues are reduced, and the cleaning performance with wider adaptability is obtained.

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 present invention relates to a bimetallic layered hydroxide / phytic acid synergistic flame-retardant nylon 6 composite material and its preparation method and application, belonging to the technical field of flame retardant material synthesis. The composite material is prepared from nylon 6, bimetallic layered hydroxide and phytic acid. Wherein, the phosphate functional group in the phytic acid can chelate with the metal ion in the bimetallic layered hydroxide, thereby forming a novel flame retardant. When combustion occurs, the layered structure and thermal decomposition products such as metal oxides, metal phosphates, and carbon-containing aromatic network structure substances in the flame retardant help to suppress the release of smoke and toxic gases, and the release of metal ions and phosphorus-containing free radicals helps to suppress the spread of fire. Compared with pure nylon 6, the peak heat release rate and total heat release rate of the composite material are greatly reduced, the limiting oxygen index is greatly increased, and the vertical combustion test reaches V-0 level. At the same time, the raw material sources in the preparation method of the composite material are abundant, the operation is simple, and it is suitable for scaled-up production.

The technology of the present disclosure generally relates to the field of power storage devices, and more specifically to a solid electrolyte, an electrode, a solid-state battery, and a method for producing the same. An aspect of the present disclosure relates to a process for producing a solid electrolyte, comprising the steps of: - contacting, in the presence of a catalyst: - a polymer precursor compound comprising polyethylene glycol (PEG) and / or polytetrahydrofuran (PTHF), wherein the polymer precursor compound comprises on average per polymer precursor molecule, -at least 2.0 alkoxysilyl functional groups, with a functionality of at least 2.0, preferably at least 2.5, preferably at least 3.0; and / or -at least 1.0 alkoxysilyl functional groups, with a functionality of at least 3.0; - optionally, an organo-tri-alkoxy silane, an organo-tetra-alkoxy silane, and / or a mixture thereof comprising a metal ion (M+) chelating moiety being a cyanurate, a crown ether, an aza-crown ether, a thia-crown ether, a cryptand, a carbamate, a cyano group, a thiocyanate group, or a metallacrown,, - a metal (M+) salt, preferably does the metal salt comprises Li+, Na+, Mg+, Ca+, Al+, and / or a combination thereof, preferably lithium (Li+); - a solvent, preferably an organic solvent; and, - optionally, an ionically conductive compound; thereby obtaining a solid electrolyte; - optionally, drying the obtained solid electrolyte.

The invention relates to the technical field of daily chemicals, and particularly discloses a dishwashing liquid for a low-temperature dishwasher and a preparation method of the dishwashing liquid. The dishwashing liquid for the low-temperature dishwashing machine comprises a colored stain removal synergistic composition, in the dishwashing liquid for the low-temperature dishwashing machine, the mass percentage of the colored stain removal synergistic composition is 30-40%; the colored stain removal synergistic composition is prepared by mixing sodium glucoheptonate and trisodium methylglycine diacetate according to a mass ratio of (1-3): 1. The synergistic composition for removing the colored stains has excellent low-temperature stability and high-efficiency metal ion chelation capacity, the dishwashing liquid containing the above content can efficiently remove the colored stains such as tea stains, coffee stains and fruit stains in a low-temperature environment, the decontamination effect of the dishwashing liquid in the low-temperature environment is improved, and the dishwashing liquid has the advantages of being environmentally friendly and free of toxic and side effects. And the defect that a liquid detergent cannot clean the stains is overcome.

The invention relates to a cerebroprotein peptide and casein hydrolysate composition and application thereof in improving sleep and memory, and belongs to the technical field of biological protein peptides. According to the preparation method disclosed by the invention, Maillard modification of the casein enzymolysis primary product is realized by screening the enzymolysis protease of the bovine milk casein and screening the carbonyl compound which is subjected to Maillard reaction with the casein enzymolysis primary product, so that the reducing power, the metal ion chelating capacity and the antioxidant capacity of the casein hydrolysate are effectively improved; furthermore, free radicals in the body are removed, oxidative stress reaction is relieved, and a good foundation is laid for improving sleep quality. The brain protein peptide and the casein hydrolysate are compounded, so that the sleep latency can be effectively shortened, the sleep rate can be increased, the sleep can be effectively improved, the content of dopamine and noradrenaline in hypothalamus can be reduced, the content of 5-hydroxytryptamine and the content of aminobutanoin can be increased, and the brain protein peptide composition has good effects of relieving and treating sleep disorders and improving memory.

This invention discloses a method, system, equipment, and medium for activating and promoting the release of humic acid from silkworm excrement. The method includes: mechanochemical synergistic crystal-breaking pretreatment, i.e., dry ball milling to destroy the physical encapsulation structure and induce a local alkaline microenvironment under chemical solvent-free conditions; stepwise enzymatic hydrolysis bridging activation, utilizing the acid buffering properties of silkworm excrement, sequentially adding uricase, cellulase / hemicellulase, and laccase or manganese peroxidase to form a natural pH fluctuation curve; directed microbial induction and release promotion, inoculating with Bacillus amyloliquefaciens and Bacillus lentigines for liquid fermentation to achieve metal ion chelation and surface charge regulation; and finally, low-temperature drying and molding to obtain the product. This invention also discloses the system, computer equipment, and storage medium for implementing this method. This invention does not require the addition of external acids, alkalis, or chemical chelating agents, shortens the total cycle to 2-4 days, and the obtained product has a high water-soluble humic acid content, which enhances the resistance to refixation after application to the soil.

Provided is a sheet material configured so that a metal-organic framework is not likely to become separated. This sheet material comprises: a metal-organic framework including metal ions and an organic ligand; and a paper substrate including a fiber material. The fiber material includes a chelate fiber that has a chelate functional group capable of chelate bonding with the metal ions.

This invention discloses a method for preparing vicinal diamine derivatives, belonging to the field of pharmaceutical intermediates and organic synthesis technology. Specifically, under an inert atmosphere, an aldehyde imine, an N-aryl tertiary amine, a base, a cadmium selenide quantum dot catalyst, and a solvent are mixed and reacted under blue light irradiation for 8-24 hours. After extraction with ethyl acetate and saturated brine, the organic phase is collected, dried, the solvent is removed by vacuum distillation, and purified by column chromatography to obtain the vicinal diamine derivatives. The vicinal diamine derivatives synthesized by this invention can be used as synthetic intermediates and metal ion chelating agents in drug synthesis and fine chemical industries.

This invention provides a battery separator with ion adsorption capabilities and its preparation method, belonging to the field of new energy battery technology. It solves the problem of battery capacity decay and deterioration of cycle performance caused by ion leaching damaging the SEI film and consuming active lithium. The battery separator of this invention includes a base film and a ceramic coating on at least one surface of the base film. The raw materials for preparing the ceramic coating include porous organic framework materials, metal ion chelating agents, ceramic particulate materials, wetting agents, and binders. This invention significantly improves the dispersion ability of the slurry and shortens the dispersion time by using metal ion chelating agents instead of traditional dispersants. Simultaneously, the use of binders containing specific functional groups crosslinks with the porous organic framework materials and forms a synergistic effect with the chelating agents, thereby jointly enhancing the battery separator's ability to adsorb metal ions. This effectively solves the problem of poor stability in high-energy-density battery systems, thus significantly improving the battery's energy density and cycle life.

The invention discloses a bio-responsive high polymer material and application thereof, and belongs to the technical field of biomedical materials. The bio-responsive high-molecular material provided by the invention contains polymers shown as formulas i to viii. Wherein the polymers of the formulas i to viii have excellent fluorescence performance, aggregation-induced fluorescence enhancement performance, multicolor luminescence performance and biological response capability based on a redox reversible switch, and can be applied to sensing, counterfeiting prevention, metal ion detection, multicolor imaging of in-vivo and in-vitro cells and / or tissues and quantitative detection of in-vivo and in-vitro oxidized and / or reducing substances; active oxygen in in-vivo and in-vitro tissues and cells can be removed to achieve long-acting anti-inflammatory and anti-oxidation effects, and the compound can be used for treatment of oxidative stress related diseases and visual monitoring of the treatment process; the biological activity of enhancing tissue retention, stimulating collagen generation, repairing tissue and resisting oxidation and aging of the tissue is achieved, and the effect of filling and repairing in-vivo cells and tissue can be effectively improved; the compound also has the capability of being chelated with metal ions to form a high-molecular metal complex, and can be used for resisting tumors, resisting bacteria, filling and repairing tissues, promoting collagen generation and the like.

The present invention relates to ammonium salt solution, high iron diamine alician blue staining solution and its application, belong to the field of medical detection technology. A metal ion chelating agent is added to the ammonium salt solution of the present invention, because the metal ion chelating agent can chelate the metal ions in the solution, reduce the release of oxygen free radicals, suppress and slow down the color change reaction of N, N-dimethyl-p-phenylenediamine dihydrochloride, so as to better protect N, N-dimethyl-m-phenylenediamine dihydrochloride, improve the storage stability of ammonium salt solution, significantly improve the problem of color deepening or blackening when ammonium salt solution is stored for a long time. In addition, when the ammonium salt solution is used for high iron diamine alician blue staining solution, the staining effect of the staining solution in pathological tissue is not affected, and the background is clean and the staining specificity is good.

The application discloses a storage-stable methylglycine-N,N-diacetic acid trialkali salt composition and a preparation method and application thereof, which comprises methylglycine-N,N-diacetic acid trialkali salt, N,N-dimethylglycine metal salt, sulfite and water. The composition can be used for storing and / or stabilizing transportation of methylglycine-N,N-diacetic acid trialkali salt, improving the stability of the metal ion chelating ability of the composition product, especially the stability of the chelating ability of calcium ions and magnesium ions, and the composition product can be stably applied to the fields of daily washing, water softening and sewage treatment.

The invention relates to the technical field of nucleic acid detection, in particular to a lysis buffer solution, a kit and an extraction method for extracting free DNA of peripheral blood. The lysis buffer solution for extracting the free DNA of the peripheral blood comprises a first lysis solution and a second lysis solution, the first lysis solution takes guanidine hydrochloride as a main chaotropic agent and at least one of ammonium thiocyanate and guanidine isothiocyanate as an auxiliary chaotropic agent, and is compounded with a metal ion chelating agent, trehalose, dithiothreitol, digestive enzyme, sodium dodecyl sarcosinate, borate and ascorbic acid; the second lysis solution takes guanidine hydrochloride as a main chaotropic agent and urea as an auxiliary chaotropic agent, and is compounded with a metal ion chelating agent, trehalose, dithiothreitol, digestive enzyme, sodium dodecyl sarcosinate, borate, ascorbic acid and polyethylene glycol. The buffer solution of the lysate does not contain SDS (sodium dodecyl sulfate), so that the residue of SDS in an extracted product can be avoided, and the amount of extracted free DNA (deoxyribonucleic acid) is more.

The invention relates to the technical field of liquid-based cytology, and particularly discloses serosa effusion cell preserving fluid. Comprising a preservation solution, an anticoagulant, a red blood cell treatment solution, a cell membrane stabilizer, an antioxidant and a metal ion chelating agent, the preservation solution contains a buffer system, an energy supply component, an antibiotic and a surfactant, and the red blood cell treatment solution contains a hemolysis active component and a cell immobilization component; the preparation method comprises the following steps: firstly, preparing the preserving fluid, adjusting the pH value, adding the active substances, mixing the antibiotics, and then completing constant volume and sterile filtration; the anticoagulant solution and the red blood cell treating fluid are independently prepared, and sterilization is achieved through filtration; and finally, packaging all the components in a sterilized storage bottle in a matched manner. The composition provided by the invention can be used for preserving cells in a clinical serosal effusion sample, and can provide a high-quality sample for subsequent cell morphology observation or detection; in addition, according to the preparation method, the controllability is high when all the components are independently prepared, and the preserving fluid with the consistent performance can be stably prepared.

The application discloses a comprehensive treatment agent for recycling fracturing flowback fluid, which comprises the following components: boron shielding agent, metal ion chelating dispersant, bactericide, pH regulator, clay stabilizer, filtrate reducer and water. The application can form a spatial net structure by using a composite multi-hydroxyl molecule to shield residual boron crosslinking agent, use a multi-metal chelating dispersant to treat high-valence metal ions such as iron, calcium and magnesium, use a high-efficiency bactericide to reduce the influence of bacteria on the prepared liquid, use a slow-release acid to properly adjust the pH value of the prepared liquid system, and add a clay stabilizer and a filtrate reducer to cope with the adverse influence of the formation on the fracturing fluid. The above additives jointly form the comprehensive treatment agent for recycling fracturing flowback fluid. The treatment agent can treat the influence of residual boron, iron, calcium, magnesium and other elements in the fracturing flowback fluid by a small amount of addition, kill bacteria, adjust the pH value and ensure the successful recycling of the fracturing flowback fluid after treatment.

This invention discloses a stable nalmefene hydrochloride injection and its preparation method, relating to the field of biomedical technology. The injection consists of nalmefene hydrochloride, sodium chloride, hydrochloric acid, and water for injection, and contains no metal ion chelating agents, with a pH value controlled between 3.5 and 3.6. The method includes: preparing the solution and adjusting the pH under high-purity nitrogen protection in a solution preparation system with low metal ion introduction risk; filtering the solution through a polyethersulfone membrane with low metal leaching, and then filling it into ampoules with a vulcanized inner surface. This invention, through the systematic integration of multiple measures such as source control of the solution preparation system, inert atmosphere protection, precise pH control, surface passivation of packaging materials, and the use of high-purity materials, synergistically inhibits the metal ion catalytic oxidation of the active ingredient, ensuring that the content of the key degradation impurity II (2,2'-bisnalmefene) remains stably below the quality standard during long-term storage, solving the problem of chemical stability control of products in chelator-free formulations, and combining safety and process robustness.

The invention provides an ultrahigh pressure-irradiation synergistically sterilized duck meat product and a preparation method of the ultrahigh pressure-irradiation synergistically sterilized duck meat product. Comprising the following steps: S1, pretreating duck meat; s2, dynamic ultrahigh pressure treatment: 1) a gradient boosting stage; (2) instantaneous pressure relief; s3, pulse irradiation sterilization: 1) primary irradiation; 2) secondary irradiation; s4, flavor-texture shaping: 1) microwave vacuum drying; 2) infrared-hot air combined drying; and vacuum packaging. Through sequential coupling design of CO2 permeation, high-pressure micropore formation and irradiation free radical removal, in a dynamic ultrahigh pressure treatment stage, nano astaxanthin is triggered to be released from a chitosan / lecithin carrier in a targeted manner and is combined with hydroxyl free radicals generated by irradiation; cO2 is promoted to permeate muscle fibers; the astaxanthin released under ultrahigh pressure is combined with hydroxyl radicals generated by irradiation, and irradiation is performed twice to promote free radical removal, so that oxidative damage is reduced; exopolysaccharide in the lactic acid bacteria fermentation liquor is chelated with metal ions, and fat oxidation is inhibited.

The invention provides a flax roving scouring and bleaching process which comprises the following steps: 1, loading flax roving into a creel with a Teflon coating in a loose uniform winding manner, and controlling the total yarn loading amount to be 75 + / -5% of the effective volume of a main scouring and bleaching pot; 2, soft water is injected into a saucepan according to the liquid ratio of 1: 10-1: 15, the temperature is increased to 65-75 DEG C, a nonionic penetrant is added, the creel in the step 1 is hung into the saucepan after operation is conducted for 5 minutes, heat preservation operation is conducted for 25-35 minutes in a positive and negative circulation alternating mode, and after waste liquid is discharged, normal-temperature soft water is used for washing twice in an overflow mode, and washing is conducted for 10 minutes each time; 3, formic acid and a metal ion chelating agent are added into a main pot, water is added till the liquid ratio is 1: 12, a circulating pump is started, the temperature is increased to 50-55 DEG C, the washed creel is put into the main pot, the temperature is kept, the stirring reaction is conducted for 20-30 minutes, the pH value is monitored and maintained to be 3.0-3.5 in the process, and after pickling is completed, waste liquid is pumped into a neutralization pool to be treated after being filtered through a stainless steel filter screen.

The invention relates to the technical field of active peptide chelate preparation, and discloses a high-chelation-rate colla corii asini peptide-metal ion chelate preparation method, which comprises: preparing a colla corii asini protein solution; adding a metal ion solution into the colla corii asini protein solution to carry out pre-reaction so as to construct a metal ion template; then adding a core function protease with a self-speed-limiting characteristic on a product, and carrying out synchronous enzymolysis-chelation reaction under the guidance of a template; and finally terminating the reaction to obtain a product. According to the method, oriented cutting of protease hydrolysis sites is realized by pre-constructing a metal ion template, and excessive hydrolysis of the product is avoided by utilizing the self-speed-limiting characteristic of the core function protease. Enzymolysis and chelation reaction are carried out synchronously, so that the process flow is obviously simplified, and the loss of intermediate products is avoided. The colla corii asini peptide-metal ion chelate prepared by the method has the technical effects of high chelation rate, concentrated molecular weight distribution and high utilization rate of raw material protein.

According to a natural detergent composition, a detergent composition according to one aspect does not use synthetic chemical components such as metal ion chelating agents, unlike conventional synthetic detergents, so it does not cause environmental pollution, is harmless to the human body, is non-irritating to the skin, has low mineral salt precipitation, and has excellent cleaning power.

To provide a sheet material in which a metal organic structure is less liable to fall down.SOLUTION: A sheet material disclosed here includes a metal organic structure including a metal ion and an organic ligand, and a paper substrate including a fiber material. The fiber material includes a chelate fiber having a chelate functional group that can form a chelate bond with the metal ion.SELECTED DRAWING: Figure 5B

Particles loaded with lanthanide (III) rare earth metal ions chelates for use as labels in binding assays. Particles and uses for detecting analytes in samples is described.

The application relates to the technical field of biological detection, and particularly discloses a rapid detection kit for Helicobacter pylori and an application method thereof; the kit comprises a sample processing liquid, an antigen pre-enrichment particle suspension and an immunochromatography test paper card; the sample processing liquid comprises an antigen-induced release system, a composite lysis system, a matrix interference blocking system and a chromatography promoter; the antigen pre-enrichment particle is a magnetic nanoparticle with an anti-Helicobacter pylori antibody coupled on the surface; and the immunochromatography test paper card is provided with a first detection line, a second detection line and a quality control line on a nitrocellulose membrane in sequence. The antigen is mildly and efficiently released through the antigen-induced release system, the bacterial cell wall is synergistically lysed through non-ionic and anionic surfactants, the interference substance is blocked through a double mechanism of a protein blocking agent and a metal ion chelating agent, the low-abundance antigen is enriched through the magnetic nanoparticle, and the sample effectiveness is monitored through the second detection line.

The application relates to a preparation method and application of a self-assembled rare earth doped high-nickel cobalt-free positive electrode material, and belongs to the field of lithium ion batteries. The preparation method of the self-assembled rare earth doped high-nickel cobalt-free positive electrode material comprises the following steps: (1) mixing a lithium salt, a nickel salt, a manganese salt, an aqueous solution of a single-layer MXene, a surfactant and water to obtain a dispersion liquid; (2) adding the dispersion liquid into a solution containing a metal ion chelating agent, adjusting the pH value and heating to form a gel; and (3) calcining and annealing under a pure oxygen atmosphere to obtain a rare earth doped LiNi x Mn 1‑x O2 powder. The method improves the problems of cobalt-free positive electrode cation disordering and poor cycle stability in the prior art.

The application belongs to the technical field of biosensing, and particularly relates to a giant magnetoresistance biosensor for detecting protease, a preparation method and application thereof, which comprises a giant magnetoresistance sensor, a glass sheet plated with a gold film, a functional polypeptide and metal ion chelated magnetic beads; wherein the glass sheet plated with the gold film is fixed on the giant magnetoresistance sensor, one end of a peptide chain of the functional polypeptide is connected with the glass sheet plated with the gold film, and the other end is connected with the metal ion chelated magnetic beads; the giant magnetoresistance biosensor provided by the application can realize monitoring of protease activity, has high sensitivity, strong anti-interference ability, stable performance, and is easy to integrate, so that the giant magnetoresistance biosensor can develop into a portable detection device for large-scale promotion, and has wide application prospects in the fields of diagnosis, treatment and related drug development of major diseases.

The invention relates to the technical field of deodorization, and particularly discloses an N-containing compound peculiar smell removing liquid. The N-containing compound peculiar smell removing liquid is prepared from the following raw materials in parts by weight: 0.5 to 5 parts of polyene polyamine, 1 to 10 parts of cyclodextrin, 0.1 to 3 parts of weak acid, 0.1 to 2 parts of a nonionic surfactant, 0.01 to 0.5 part of a metal ion chelating agent, 0.01 to 0.5 part of plant essential oil and 80 to 95 parts of deionized water, the preparation method comprises the following steps: reducing a cyano group into a primary amino group by using ethylenediamine and acrylonitrile, decolorizing by using activated carbon, distilling and purifying to obtain polyene polyamine, dissolving a polyene polyamine intermediate, cyclodextrin, weak acid, a nonionic surfactant and a chelating agent in water at controlled temperature to form a base solution, finally adding a plant essential oil mixture and a preservative, and cooling to obtain a finished product. The composition / product provided by the invention can be used for treating the environment polluted by the peculiar smell of the nitrogen-containing compound, and has the advantages of high-efficiency broad-spectrum deodorization and good environmental compatibility.

The present application relates to a kind of perovskite solar cell and preparation method thereof, the perovskite solar cell between the hole transport layer and the perovskite film layer, and / or, the electron transport layer and the perovskite film layer are provided with passivation layer, the passivation layer includes organic covalent framework material.The organic covalent framework material used in the present application combines porphyrin unit with pyridine unit, ordered one-dimensional pore structure not only provides efficient adsorption site for noble metal ions, while the structure in pyridine group and formed imine bond can also absorb metal ions, and polybasic heterocyclic structure can also be chelated with metal ions, inhibit migration.In addition, the organic covalent framework material contains abundant passivation group, which can also significantly reduce the defects on the surface of perovskite, improve the performance of perovskite solar cell.

The present invention relates to a process for fractionation and complete recovery of flavonoids, terpenes and polysaccharides from the peel of plant material, such as citrus peels, without generating waste liquids. The present invention also relates to the flavonoids, terpenes and polysaccharides obtained by the process, as well as their use in various applications in the food, cosmetic, pharmaceutical or chemical fields. The process developed by the inventors allows the complete recovery of the flavonoids, terpenes and polysaccharide components, without using extreme pH and temperature conditions, and without generating waste liquids, providing a clean and sustainable process, since citrus peels are used as the starting point material, and the process comprises a step of acid synthesis by metal ion chelation mechanism.

The invention discloses a metal ion chelate for inhibiting urease and / or nitration, the general molecular formula of the structure is MDPA, M is a metal ion, and DPA is pyridine-2, 6-dicarboxylic acid; the invention also discloses a preparation method of the metal ion chelate for inhibiting urease and / or nitration. According to the invention, pyridine-2, 6-dicarboxylic acid is adopted as a ligand, and a polydentate coordination method is adopted for preparation, so that the compound is excellent in structural stability, simple in preparation process, outstanding in repeatability and operability, remarkable and efficient in urease inhibition performance, and capable of slowing down the degradation speed of urea and reducing the loss amount of nitrogen in soil; the compound fertilizer has the advantages that the nitrogen utilization rate is increased, favorable conditions are created for crop growth, the compound fertilizer shows an inhibition effect on nitrobacteria, the conversion process from ammonium nitrogen to nitrate nitrogen in soil can be effectively reduced, the nitrogen emission in the fertilizer release process is reduced, the compound fertilizer is environment-friendly, and the absorption efficiency of fertilizer nutrients can be improved.