18 results about "Thiourea" patented technology

The invention discloses a synthetic method for a chiral quaternary carbon oxazolidinone compound. The synthetic method comprises the following steps: taking o-hydroxy chalcone and azlactone as reactants and synthesizing in a solvent under the catalysis of chiral multifunctional chiral quinine thiourea to obtain a product. The synthetic method disclosed by the invention has the advantages that raw materials are easy to obtain, the reaction conditions are mild, the post-treatment is simple and convenient, the applicable substrate scope is wide, the yield is high, and the enantioselectivity is high; the product obtained by the synthesis method can be used for synthesizing an intermediate of a drug and a pesticide.

The invention provides a composite passivator for reducing the heavy metal content of a pig manure organic fertilizer and application of the composite passivator, and belongs to the field of organic fertilizers. The composite passivator for reducing the heavy metal content of the pig manure organic fertilizer comprises the following components by weight: 50-70 parts of thiourea modified peanut shell charcoal, 30-50 parts of a heavy metal passivating fungicide, 20-30 parts of crab shell powder, 10-20 parts of fulvic acid, and 3-5 parts of nanometer carbon black; every 100 mg of an auxiliary material of the heavy metal passivating fungicide contains 2.25*10<7> to 2.5*10<8> CFU of rhodotorula mucilaginosa strain OP11; and the preservation number of the rhodotorula mucilaginosa strain OP11 isCGMCC No.13540. The invention also discloses the application of the composite passivator to reducing the heavy metal content of the pig manure organic fertilizer.

The invention discloses a fresh flower preservative and a preparation method thereof. The fresh flower preservative is prepared from the following components in parts by weight: 70-80 parts of ethanol, 40-50 parts of ethyl pyruvate, 10-20 parts of citric acid, 8-15 parts of sodium citrate, 3-8 parts of sodium thiosulfate, 1-5 parts of stearic acid, 1-5 parts of salicylic acid, 0.5-2 parts of potassium sulphate, 1-5 parts of monopotassium phosphate, 5-10 parts of thiourea and 30-40 parts of water. The preparation method comprises the following steps: mixing ethanol and water, heating to 30-35 DEG C, adding with ethyl pyruvate, stirring for 10-20 min, then adding the other components, stirring for mixing uniformly, cooling to room temperature, and sealing for storage. With the fresh flower preservative, the flowering phase can be prolonged by 15-20 days on average, and meanwhile, fresh flowers with damaged branches, buds and leaves can bloom into bright flowers, so that the utilization ratio of the fresh flowers is greatly improved.

The invention discloses an inorganic sensitive layer based surface enhanced Raman spectrum detection technology and material preparation thereof. According to the detection technology, a surface enhanced Raman spectrum material based on an inorganic sensitive layer is used as an active substrate of a surface enhanced Raman scattering, and is exposed in the small molecule atmosphere; a new solid substance formed by specific reaction of the inorganic sensitive layer and small molecules to be detected by a Raman spectrometer is detected, and the type of the small molecules is obtained according to the Raman spectrum of the new solid substance; according to the preparation method, a colloid electrostatic self-assembly method, a thiourea-induced isotropic shell growth method, a metal halogenation method and a physical deposition method are used for a precious metal nanoparticle colloidal solution, a metal salt solution and a thiourea solution to prepare the material in which precious metalnanoparticles are coated with a metal oxide layer, or the precious metal nanoparticles are coated with a metal sulfide layer, or the precious metal nanoparticles are coated with a metal halide layer.The technology can be used for real-time online detection of hydrogen sulfide, carbon disulfide, hydrogen chloride, mustard gas, nitrogen dioxide and the like.

The invention discloses a preparation method of a thiourea dioxide low-temperature reduction clearing catalyst for disperse dyes and a reduction clearing method. The thiourea dioxide low-temperature reduction clearing catalyst is obtained by complexing rare-earth chlorides and colorless nitroaromatic compounds of a relatively simple structure according to a certain molar ratio. Dacron fabrics dyedby the disperse dyes are subjected to reduction clearing through a solution prepared from thiourea dioxides, a catalyst and an alkaline agent, and the reduction clearing of the dacron fabrics dyed bythe disperse dyes is achieved under a low-temperature condition. The low-temperature reduction clearing of the dacron fabrics dyed by the disperse dyes is achieved, the reduction clearing temperatureis lowered, energy consumption is saved, the production efficiency is improved, and the dyefastness of the dacron fabrics after reduction clearing is very excellent.

The invention discloses a preparation method of a SnS2 nanosheet loaded graphene-based nano composite material, which comprises the following steps: step 1, dispersing graphene oxide nanosheets in deionized water to prepare a graphene oxide solution; 2, dissolving tin tetrachloride in deionized water, and adding thiourea as a sulfur source and a reducing agent; 3, adding the graphene oxide solution in the step 1 into the solution obtained in the step 2, and carrying out mixing treatment through ultrasonic waves and transferring a mixture of the two solutions subjected to ultrasonic treatment into a hydrothermal reaction kettle for reaction to obtain a precipitate; and 4, centrifuging, washing, drying and grinding the precipitate obtained by the reaction in the step 3 to obtain the graphene nanosheet/tin disulfide composite nanomaterial. The graphene nanosheet/tin disulfide composite nanomaterial prepared by the method has higher capacity and stability when being used as a sodium storage electrode material.

The invention discloses a polypyrrole coated Ni-Co-S nanoneedle array composite material. Nickel acetate, cobalt acetate, urea and thiourea are used as raw materials for preparing an NF/NiCo2S4 nanoneedle array material; polypyrrole is used as a conductive polymer for preparing the polypyrrole coated Ni-Co-S nanoneedle array composite material through an adhesive and a curing agent, wherein the nanoneedle structure has a shell-core structure, the core structure is NiCo2S4, and the shell structure is polypyrrole. A preparation method of the NF/NiCo2O4 nanoneedle array material comprises the following steps: 1) preparing the NF/NiCo2O4 nanoneedle array material; (2) preparing the NF/NiCo2S4 nanoneedle array material; (3) preparing the polypyrrole coated Ni-Co-S nanoneedle array composite material. When the material is applied as a supercapacitor electrode material, the window voltage is 0-0.5 V, and the specific capacitance is 1,800-1,900 F/g when the discharge current density is 1A/g. The nanoneedle array grown on the surface of the foamed nickel carrier is regular and ordered in structure and large in specific surface area, so the electron transmission is facilitated; the coating of the conductive polymer is realized by adopting a direct dripping method, so the electrochemical performance is effectively improved.

The invention discloses a (S)-1-(3-hydroxy-1-phenylpropyl)thiourea unilateral-modified Fe-Anderson-type heteropoly acid catalyst, a preparation method and an application thereof. According to the invention, ammonium molybdate and ferric sulfate are reacted under acidic condition to generate Fe-Anderson-type heteropoly acid parent; then heteropoly acid parent and tris(hydroxymethyl)aminomethane are reacted under backflow condition to obtain amino unilateral-modified Fe-Anderson-type polyoxometallate; (S)-1-(3-hydroxy-1-phenylpropyl)isorhodanate is synthesized; and finally, polyoxometallate and (S)-1-(3-hydroxy-1-phenylpropyl)isorhodanate are subjected to the reaction to obtain the target product. The preparation method has the advantages of simple process, high yield, mild reaction condition, and environment friendlessness; the catalyst can be used for a self-oxidation coupling reaction of a aryl methylamine compound, and has the advantages of environment pollution and high efficiency, high corresponding selectivity, and easy recovery and utilization.

The invention discloses preparing fluorescent carbon quantum dots from alternanthera philoxeroides and the use thereof for detecting a food additive lemon yellow. The method comprises the following steps: a, weighing alternanthera philoxeroides powder and thiourea in a mass ratio of 1: 1, adding water, carrying out stirring, and carrying out transferring to a reaction kettle; b, putting the materials into a drying oven, and performing reacting at a set temperature; c, after the reaction is finished, naturally cooling to room temperature, carrying out suction filtration to obtain a carbon quantum dot solution, carrying out dialyzing, carrying out rotary evaporation, and carrying out drying to obtain carbon quantum dot powder. The prepared fluorescent carbon quantum dot for detecting lemon yellow belongs to a turn off type, and has the advantages of high sensitivity, strong stability, good selectivity, low cost and the like. The optimal concentration range of linear detection is 7.8-125 [mu]mol/L, the detection limit is 0.45 [mu]mol/L which is far lower than the detection limit 187.14 [mu]mol/L provided by the national standard GB/T 5009.35-2003, and the method can be used as a convenient and accurate lemon yellow rapid detection method.

The invention provides a reduced graphene/alpha-Fe2O3 supercapacitor material and a preparation method and application thereof. The preparation method of the reduced graphene/alpha-Fe2O3 supercapacitor material comprises the following steps: (1) dissolving Fe (NO3) 3.9H2O, CTAB, urea and graphene oxide dispersion in a methanol solution and performing hydrothermal reaction at 160-200 DEG C for 8-24h; (2) pumping and filtering the reaction product obtained in the step (1), adding the obtained solid and thiourea into water, uniformly mixing and transferring to a reaction kettle and performing hydrothermal reaction at 160-200 DEG C for 8-24 hours; and (3) pumping and filtering the product obtained in the step (2), freezing and drying and then performing heat treatment. The supercapacitor material is simple in preparation of the working electrode, and the electrochemical working window in the alkaline electrolyte is from -1.05 V to -0.3 V and the maximum specific capacity can be 1296 F/g so as to be an ideal negative electrode material. The shortcoming of low specific capacity of the negative electrode material of the supercapacitor can be overcome, the problem of mismatch between thepositive electrode and negative electrode specific capacity of the supercapacitor can be solved and thus the material has high research value.

The invention discloses a hydrophobic butadiene rubber material. The material is prepared from, by weight, 0.2-0.3 part of azodicarbonamide, 2-4 parts of calcium stearate, 30-40 parts of carbon nano tubes, 50-60 parts of hydroxyl-terminated polybutadiene, 200-300 parts of N-methylpyrrolidone, 5-7 parts of boric oxide, 160-200 parts of butadiene rubber, 2-3 parts of anti-aging agent 4010, 1.3-2 parts of sulphur, 10-13 parts of trifluoroethyl methacrylate, 1-3 parts of nickel aminosulfonate, 3-5 parts of tetraethoxysilane and 0.5-1 part of ethylene thiourea. Trifluoroethyl methacrylate is added, and the hydrophobic performance of the finished material surface is effectively improved.

The invention discloses a preparation method of a Ni-doped stannic oxide formaldehyde sensitive ternary composite material based on a ZIF-8 metal organic framework template as well as a product and application of the Ni-doped stannic oxide formaldehyde sensitive ternary composite material. According to the method, the ZIF-8 MOF material is used as a crystallization template, thiourea is decomposedunder an ethylene glycol solvothermal condition to provide S2-, and SnS2 and NiS precursors are generated; the Ni-doped SnO2 formaldehyde sensitive ternary composite material based on the ZIF-8 metalorganic framework template is prepared by regulating and controlling conditions such as precursor roasting temperature and roasting time, ZIF-8 is used as a template, so that the specific surface area of the prepared composite material can be greatly increased, and meanwhile, Zn and Ni are doped, so that the response value and selectivity of SnO2 to formaldehyde gas are further improved; the solvothermal preparation method is simple, the reaction temperature is low, follow-up treatment is not needed, and the SnO2/NiO@ZIF-8 ternary composite material prepared by the method can be used for formaldehyde gas sensors and the like.

The invention discloses a preparation method for an N, O-disubstituted ketimine derivative. The preparation method comprises the following steps: under the action of a chiral thiourea catalyst, enabling N-substituted ketimine and alcohol to generate an asymmetric addition reaction; and after the reaction is completed, carrying out post-treating to obtain the N, O-disubstituted ketimine derivative. According to the preparation method, the special chiral thiourea catalyst is adopted as a catalyst for the asymmetric addition reaction, so that the efficiency and the ee value of the reaction are improved, and the scope of application of a substrate is wide.

The invention discloses an amino phosphate water-soluble corrosion inhibitor and a preparation method thereof. The corrosion inhibitor contains, by weight, 30-45 parts of amino phosphate mixed solutions, 4-6 parts of N-methyl thiourea, 5-10 parts of ethylene glycol monomethyl ether, 5-8 parts of formamide, 5-9 parts of p-hydroxybenzoic acid, 1-5 parts of nonylphenol polyoxyethylene ether, 1-2 parts of octyl phenol polyoxyethylene ether, 6-23.5 parts of water, 8-15 parts of vinyl ethylene glycol ether, 0.5-2.5 parts of3-methyl-2-pentene-4-alkynol and 2-6.5 parts of acetaldehyde methyl hexyl acetal. The amino phosphate corrosion inhibitor has good anti-corrosion effects on an oil and gas field collecting and conveying system with high CO2 (partial pressure of 0-5 MPa) and H2S coexistence (the partial pressure of 0-1 MPa).

The invention belongs to the technical field of etching antennas, and particularly relates to a corrosion inhibitor for reducing lateral etching of etching antennas. The corrosion inhibitor is prepared from the following raw materials in parts by weight: 3-7 parts of urotropine (hexamethylenetetramine), 2-5 parts of thiourea, 16-28 parts of chlorinated poly (N-carboxymethyl-4-vinyl pyridine) salt,7-10 parts of EDTA (ethylene diamine tetraacetic acid), 6.5-10.5 parts of maleic anhydride, 4-8 parts of citric acid, 6-8 parts of ascorbic acid, 8-12 parts of sodium percarbonate, 2-5 parts of polyethylene glycol and 28-48 parts of deionized water. The corrosion inhibitor is non-toxic and harmless, the overall etching speed can be increased, meanwhile, the local etching speed is decreased, lateral etching can be reduced as much as possible while it is guaranteed that etching is thorough in the process of overall etching, and the etching process can be operated stably and evenly.