28 results about "Semicarbazide" patented technology

The present invention relates to the field of the preparation of polyurethane elastic fibers, and relates to a preparation method for a bio-based polyurethane elastic fiber, comprising: preparing polyether polyol from sucrose, glycerol, dimethylamine and propylene oxide; adding a solvent, i.e., N,N-dimethylacetamide, and polyether polyol and polyisocyanate into a reaction tank, and adding p-Toluenesulfonyl semicarbazide and aluminum methylenebis(2,4-di-tert-butylphenoxy) phosphate to prepare a spinning solution; and subjecting the spinning solution to spinning and oil application by means of dry spinning technology to obtain the bio-based polyurethane elastic fiber. The present invention ensures that the properties of polyurethane elastic fibers do not deteriorate or are partially enhanced, while the cost and performance advantages are achieved.

The present application belongs to the technical field of water treatment, and relates to a heat-sensitive color developing agent F-103 production wastewater treatment method. The present application performs multistage treatment on the wastewater. First, an alkaline chemical separation reaction is performed on the wastewater to remove part of the acidic polar organic matter 3-p-tolylsulfonylureido phenol, p-toluenesulfonic acid and the like in the water. Then, an acid chemical separation reaction is performed to further remove the alkaline polar organic matter intermediate MAPOTs and the like in the water. Subsequently, an adsorption reaction is performed using activated carbon to further remove the organic matter and inorganic impurities in the water. Finally, evaporation and concentration are performed to recover the salt sodium chloride. The wastewater treatment of the present application recovers the salt sodium chloride in the wastewater as a resource under the premise of solving the toxicity problem of the organic matter in the wastewater, and realizes the harmless treatment and the reduction of hazardous waste of the wastewater.

The invention relates to a trifluoro-uracil compound containing a semicarbazide structure and a preparation method and application thereof, and provides the trifluoro-uracil compound containing the semicarbazide structure, and the structure is shown as a formula I; the compound has excellent herbicidal toxicological properties, can be used as a pesticide, and particularly can be used as an active ingredient of a herbicide; when being applied to pesticides, the compound has a wider weed control spectrum, can generate a better killing or preventing and treating effect on various weeds, and shows excellent herbicidal activity; the compound is simple in structure, raw materials are easy to obtain and low in cost, and the compound has higher industrial value.

The invention relates to a thermally expandable composition comprising: a) At least one thermoplastic polymer TP and / or at least one solid rubber R and b) At least one polymeric blowing agent BA selected from the group consisting of sulfonyl hydrazide-functionalized polymers, sulfonyl semicarbazide-functionalized polymers, carbamate-functionalized polymers, and ureido carbamate-functionalized polymers, wherein the polymeric blowing agent BA has a number average molecular weight (Mn) determined by gel permeation-chromatography (GPC) using polystyrene 0 as standard of at least 500 g / mol, preferably at least 750 g / mol.

The invention discloses a method for determining the content of semicarbazide in a plastic product, and belongs to the technical field of analytical testing, the method is a spectrophotometric method, and the method specifically comprises the following steps: firstly, carrying out derivatization treatment by adopting benzoyl chloride, and then carrying out absorbance detection at 280nm; compared with a liquid chromatography-mass spectrometry method, the method is faster and more efficient in detection and suitable for rapid detection occasions and checkout rooms with low investment cost requirements, the lowest detection capacity of the method is 0.1 mg / L, most quantitative requirements are met, the pretreatment process is simple, the derivation time is short, the operation process is easy to master, and the method is suitable for industrial production. And the result can be obtained only in about 10 minutes in the conventional detection, so that the timeliness and the safety are very high.

The currently claimed invention relates to a method for improving the color fastness of a cellulose-based substrate to nitrogen oxides and ozone. The method comprises contacting the cellulose-based substrate with a composition comprising: at least one aminourea compound selected from bis[4-[3-(dimethylamino)ureo]phenyl]methane (I) and 4,4'-hexamethylenebis(1,1-dimethylaminourea) (II); at least one solvent selected from alcohols of formula A, glycol ethers of formula B, glycol ethers of formula C, polyethylene glycol, and water; R 1 -OH-A,R 2 -(OCH2CH2-) n OH-B,R 3 -(OCH2(CH3)CH-) m OH-C, where R 1 Selected from C2-C 10 Straight-chain or branched alkyl groups; R 2 Selected from C1-C6 straight-chain or branched alkyl groups; n is 1, 2 or 3; R 3 Selected from C1-C6 straight-chain or branched alkylene groups; and m is 1 or 2; wherein the cellulose-based substrate is selected from at least one of the following: dyed cellulose-based substrate, printed cellulose-based substrate, and dyed and printed cellulose-based substrate; and (ii) drying.

The invention relates to a process for producing polyurethanes using a component A comprising a polyhydrazide, a polysemicarbazide, a polysulfonyl hydrazide and / or carbodihydrazide, in particular a polyhydrazide, wherein the component A is employed in the form of a mixture C which further comprises a component B comprising a dispersion medium.

The invention discloses 1-(4-aminophenyl)-3-[(4-aminophenyl) carbamoylamino] urea as well as a preparation method and application thereof. The 1-(4-aminophenyl)-3-[(4-aminophenyl) carbamoylamino] urea product is obtained by reacting p-phenylenediamine and diethyl azodicarboxylate under the action of a catalyst. The method is simple in process, milder in reaction condition, easier to control, high in environmental protection property, low in danger coefficient, high in yield and more suitable for industrial application. The product can interact with carbon black to improve the dispersion of carbon black with high specific surface area, can react with carbon-carbon double bonds in natural rubber to form a stable cross-linked network, improves the anti-reversion performance of a rubber material, and has more important social significance and higher economic value.

The application discloses application of a combined inhibitor of copper-molybdenum mixed concentrate in copper-molybdenum flotation separation. The application firstly carries out fine grinding and medicine removing on the copper-molybdenum mixed concentrate; adds the combined inhibitor to inhibit chalcopyrite during the fine grinding process; then adds a collector and a foaming agent to obtain a molybdenum rough concentrate and a copper rough concentrate through roughing; the molybdenum rough concentrate is obtained after being refined, and the copper rough concentrate is obtained after being scanned. The combined inhibitor comprises thiosemicarbazide and thiolactic acid. The dosages of the water-soluble thiosemicarbazide and the thiolactic acid are 0.2-0.5 kg and 0.1-0.2 kg respectively per ton of the copper-molybdenum mixed concentrate. The application can replace the use of toxic inhibitors to reduce environmental pollution, and significantly improve the flotation separation efficiency of copper and molybdenum, and realize efficient separation of copper and molybdenum concentrates.

The utility model belongs to the technical field of toluenesulfonyl semicarbazide production, and particularly relates to a double-decomposition reaction kettle which comprises an outer kettle body and an inner kettle body, the inner kettle body is fixed inside the outer kettle body, and a first rotating shaft and four second rotating shafts are rotatably connected to the inner kettle body through bearings. One end of each of the first rotating shaft and the four second rotating shafts slidably penetrates through the outer kettle body and extends out of the outer kettle body, and first blades are fixed to the surface of the first rotating shaft at equal intervals. According to the reaction kettle disclosed by the utility model, the vertical stirring shaft I and the four transverse stirring shafts II which are obliquely arranged are arranged in the inner kettle body, so that raw materials in the inner kettle body can be more disordered when being stirred, and the uniformity and sufficiency of material mixing are further improved; the damping structure can reduce the vibration of the reaction kettle during operation, so that the risk of material leakage caused by equipment shaking is reduced, and the noise of the reaction kettle during operation can be reduced.

The invention relates to the field of tuning part electroplating processing, and discloses an electroplating process of a high-voltage tuning resonance rod, which comprises the following steps: S1, pretreatment of the resonance rod; s2, performing soaking treatment on the pretreated resonance rod by using a first treatment agent to obtain a primarily treated resonance rod; s3, pre-copper-plating treatment of the primary treatment resonance rod; s4, the resonance rod subjected to copper pre-plating is soaked with a second treating agent, and a pretreated resonance rod is obtained; s5, silver plating treatment, water washing and drying are conducted on the pretreated resonance rod, and the high-voltage-modulation resonance rod is obtained; the first treatment agent is prepared from sodium lignin sulfonate, hydroxypropyl trimethyl ammonium chloride chitosan and water, and the second treatment agent is prepared from sodium 2-acrylamido-2-methylpropanesulfonate, 4-ethyl-3-thiosemicarbazide, acetylchitosamine, polyethylene glycol and water. The plating layer of the high-voltage resonance adjusting rod has the advantages of being fine and firm, is not prone to being influenced by high-voltage corona under the condition of bearing radio frequency high voltage for a long time, and is good in reliability.

Thioesters, thiocarbamates, thiocarbazates, semithiocarbazates, peptides, aza-amino acid conjugates, and azapeptides; and a chemoselective and site-specific functionalization protocol of protected thiocarbazates and semithiocarbazates are described. The protocol features the use of Mitsunobu reaction to alkylate specifically the nitrogen atom close to the acylthiol moiety with alcohols to produce protected mono-substituted thiocarbazates that can be stored for months, activated under mild conditions at low temperature using halonium reagents and integrated orthogonally to make substituted semicarbazides that can be used, e.g., as synthons in synthesis of aza-amino acid conjugates, azapeptides and other peptidomimetics. Methods for preparing and using ureases, carbazides, semicarbazides, beta-peptides, azapeptides, and other peptidomimetics and azapeptide conjugates, and uses of ureases, carbazides, semicarbazides, beta-peptides, azapeptides in drug discovery, diagnosis, inhibition, prevention and treatment of diseases are also described.

This invention relates to the field of photocurable adhesives, specifically to a UV-curable, positionable temporary masking adhesive and its processing technology. It addresses the problems of slow curing speed, low mechanical properties, and poor peel strength in existing temporary masking adhesives. Modified photosensitive polyurethane is used as the core film-forming resin. Its rigid oligocellulose skeleton imparts excellent modulus and thermal stability to the adhesive layer. The chain extender introduces amide groups that form a dense, strong hydrogen bond network between molecular chains, enhancing cohesive strength and tear resistance. Simultaneously, the pyrimidine ring provided by 2,4-dihydroxypyrimidine-5-carboxylic acid forms dynamic coordination bonds with zinc ions dissociated from zinc acetate, enhancing the mechanical properties after curing. A rapid decrease in viscosity can be achieved under secondary triggering. The highly efficient hydrogen abstraction initiation capability of the nano-photoinitiator enables rapid photocuring. Its cage-like rigid skeleton nano-sizes the photoinitiator and utilizes steric hindrance to reduce migration rate. These two elements work synergistically to achieve rapid positioning curing, high strength, and full-sheet peeling.

The present invention provides preparation of a semicarbazide-sensitive amine oxidase inhibitor and use thereof. In particular, disclosed in the present invention are a compound as represented by formula I, or a stereoisomer or a racemate or a pharmaceutically acceptable salt of the compound. Also disclosed in the present invention is that the compound can inhibit semicarbazide-sensitive amine oxidase.

Thioesters, thiocarbamates, thiocarbazates, semithiocarbazates, peptides, aza-amino acid conjugates, and azapeptides; and a chemoselective and site-specific functionalization protocol of protected thiocarbazates and semithiocarbazates are described. The protocol features the use of Mitsunobu reaction to alkylate specifically the nitrogen atom close to the acylthiol moiety with alcohols to produce protected mono-substituted thiocarbazates that can be stored for months, activated under mild conditions at low temperature using halonium reagents and integrated orthogonally to make substituted semicarbazides that can be used, e.g., as synthons in synthesis of aza-amino acid conjugates, azapeptides and other peptidomimetics. Methods for preparing and using ureases, carbazides, semicarbazides, beta-peptides, azapeptides, and other peptidomimetics and azapeptide conjugates, and uses of ureases, carbazides, semicarbazides, beta-peptides, azapeptides in drug discovery, diagnosis, inhibition, prevention and treatment of diseases are also described.

The present invention relates to a manufacturing process for bio-based polyurethane elastic fibers and belongs to the field of polyurethane elastic fiber production. The manufacturing process comprises: producing polyether polyol using sucrose, glycerol, dimethylamine, and epoxypropane; adding the solvent N,N-dimethylacetamide, polyether polyol, and polyisocyanate to a reaction vessel; and adding p-toluenesulfonyl semicarbazide and methylenebis(2,4-di-tert-butylphenyl)phosphate aluminum to produce a spinning solution; producing the bio-based polyurethane elastic fibers by applying the dry spinning process to the spinning solution, wherein spinning and subsequent oiling are carried out. The invention ensures that the properties of the polyurethane elastic fibers are not impaired or that certain functional properties are improved, while simultaneously achieving an advantage in terms of cost and performance.

Compounds of formula (I):or a pharmaceutically acceptable salt, solvate or polymorph thereof, including all tautomers and stereoisomers thereof, wherein:A is monocyclic and bicyclic heteroaryl;B is alkyl, heteroalkyl, alkyl-amino, aryl, heteroaryl, cycloalkyl, heterocyclyl, or alkylene;D is aryl-amino, heteroaryl-amino, cycloalkyl-amino, heterocyclyl, heterocyclyl-amino, urea, thioamide, thiourea, sulfonamide, sulfoximine, or sulfamoyl; andE is aryl, heteroaryl, cycloalkyl, or heterocyclyl.These compounds of formula (I) are inhibitors of glutaminyl cyclase (QC, EC 2.3.2.5).

The application discloses a kind of sulfuryl amino methyl carbonate base modified substituted benzamide urea new compounds and preparation method thereof, belong to heterocyclic compound technical field. With the key intermediate 4-[2-(2-amino-4(3H)-oxo-7H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic acid of synthesizing pemetrexed disodium as mother nucleus, using NHS / EDC system activation mother nucleus carboxyl, make it react with the modifier containing free amino, so as to introduce glutamic acid recognition site and hydrophobic sulfuryl amino methyl carbonate tert-butyl ester fragment in structure;Modifier is lysine as connecting chain, glutamic acid and lysine are connected by amide bond, chlorosulfonyl amino methyl carbonate tert-butyl ester is grafted to lysine side chain by nucleophilic substitution reaction, while retaining pemetrexed recognition site, improve the hydrophobicity of molecular structure.

This radioactive antitumor agent comprises a radioactive dithiosemicarbazone-copper complex as an active ingredient, and is characterized by being used in such a way that the radioactive dithiosemicarbazone-copper complex is administered multiple times to an organism requiring tumor treatment, at a radioactive dose that avoids dose-limiting toxicity, as determined on the basis of hematological parameters. The multiple administration preferably consists of intermittent administration at time intervals allowing the hematological parameters to return to a normal range.

The application provides a titanium alloy etching liquid and a preparation method thereof, and belongs to the technical field of etching compositions, and comprises the following steps: S1, dissolving aminothiourea in anhydrous ethanol under continuous stirring, then adding 3-acetyl coumarin solution dropwise, mixing and stirring, adding concentrated acetic acid dropwise, refluxing under continuous stirring, cooling, filtering, taking out the solid, washing, and obtaining a coumarin-thiosemicarbazide hybrid; S2, adding the coumarin-thiosemicarbazide hybrid into anhydrous ethanol, heating, and ultrasonic treating to obtain a coumarin-thiosemicarbazide solution; and S3, uniformly mixing deionized water, citric acid, ammonium citrate, a hydroxyethylidene diphosphonic acid aqueous solution, hydrogen peroxide and the coumarin-thiosemicarbazide hybrid solution to obtain the titanium alloy etching liquid. The application can make etching be carried out efficiently and stably while avoiding the occurrence of side etching.

The invention provides a titanium alloy etching solution and a preparation method thereof, and belongs to the technical field of compositions for etching, and the preparation method comprises the following steps: S1, dissolving thiosemicarbazide in absolute ethyl alcohol under continuous stirring, then dropwise adding a 3-acetocoumarin solution, mixing and stirring, dropwise adding concentrated acetic acid, refluxing under continuous stirring, cooling, filtering, taking out a solid, and washing to obtain a titanium alloy solution; a coumarin-thiosemicarbazide hybrid is obtained; s2, adding the coumarin-thiosemicarbazide hybrid into absolute ethyl alcohol, heating, and carrying out ultrasonic treatment to obtain a coumarin-thiosemicarbazide solution; and S3, deionized water, citric acid, ammonium citrate, the hydroxyethylidene diphosphonic acid aqueous solution, hydrogen peroxide and the coumarin thiosemicarbazide hybrid solution are mixed to be uniform, and the titanium alloy etching solution is obtained. According to the invention, the etching can be carried out efficiently and stably, and the lateral erosion phenomenon can be avoided at the same time.

The invention relates to the technical field of brightener processing, in particular to an acid copper plating brightener, an acid copper plating electroplating solution and an electroplating technology of the acid copper plating brightener. The cleaning agent is prepared from the following raw materials by concentration: 50-100 g / L of octadecylamine polyoxyethylene ether, 10-20 g / L of thiamine hydrochloride, 5-30 g / L of polydiaminourea, 20-40 g / L of aspirin sodium and 80-120 g / L of a surfactant. According to the brightening agent, through the synergistic effect of all the components, the problems that a traditional brightening agent is prone to scorching, fogging and coarse crystallization under the high current density are effectively solved, the contradiction between deep hole filling and plate surface brightness is balanced, the dog-bone-shaped distribution and cavity defects in high-thickness-diameter-ratio through hole electroplating are overcome, and overplating and stripes in a low-current area are avoided. The obtained copper plating layer is fine in crystallization, bright and flat, the interlayer interconnection reliability and the microscopic uniform plating capacity are remarkably improved, the method is matched with the VCP vertical continuous electroplating technology, and the light, thin and high-frequency manufacturing requirements of high-density and fine circuit PCBs are met.

The present application relates to the technical field of radioactivity detection, and particularly relates to a methanol quenching inhibition type scintillation liquid and application thereof, the methanol quenching inhibition type scintillation liquid comprising: a solvent, an anti-quenching scavenger, a pH buffer, a first scintillator and a second scintillator, wherein the solvent comprises a non-polar main solvent and a polar composite cosolvent; and the anti-quenching scavenger comprises a semicarbazide hydrochloride and a molecular sieve powder.The methanol quenching inhibition type scintillation liquid provided by the present application has good compatibility with a methanol sample, can be directly mixed with the methanol sample for scintillation counting, can effectively inhibit the quenching effect caused by the methanol and sample impurities, and can improve the detection accuracy, while simplifying the detection process and reducing the detection cost.

The application provides a recyclable bio-based waterborne polyurethane emulsion, an elastomer and a preparation method thereof. By introducing a bio-based polyphenol crosslinking agent, a dynamic phenol-urethane bond crosslinking network is constructed, and the dynamic bond can be reversibly broken and recombined under specific conditions. At the same time, the waterborne polyurethane itself has a rich amino / urea urethane bond, which can form a multiple hydrogen bond network without introducing an exogenous functional group. Under the synergistic action of the dynamic reversible chemical bond and the multiple hydrogen bond, the obtained waterborne polyurethane has excellent mechanical properties, recyclability and repeatable processing performance. The tensile strength of the waterborne polyurethane can reach 36.6 MPa, the elongation at break can reach 762%, and the toughness can reach 153.7 MJ m ‑3 , and the original tensile strength can still be maintained after ethanol recovery or hot-press recovery treatment.

The application discloses a green synthesis method of 2-amino-5-aryl-1,3,4-thiadiazole and belongs to the technical field of chemical synthesis. The specific steps comprise the following steps: mixing aryl aldehyde, thiosemicarbazide and ethanol, then performing solid separation after temperature rising, performing suction filtration to obtain an intermediate compound, and then performing cyclization reaction on the intermediate compound and ionic liquid to obtain 2-amino-5-aryl-1,3,4-thiadiazole, and the yield can reach more than 96%. The application has the characteristics of high reaction efficiency, short reaction time, mild reaction condition, recyclable catalyst, strong catalytic capacity and green energy saving. The application solves the technical problems that the catalyst cannot be recycled and has weak catalytic capacity in the traditional synthesis method, the substrate has poor adaptability in the synthesis process, and the chemical stability of the used compound is not high, so that the yield and purity of the product are not high.

This invention provides a system and method for the continuous preparation of 1,3-dimethyl-4-aminoureazine, relating to the field of organic compound synthesis and preparation technology. The system includes multiple reactor groups arranged sequentially. Each reactor group comprises a reaction tube, a heat exchange jacket, an internal component group, and a solid-liquid separator. The internal component group is disposed within the reaction tube, which is disposed within the heat exchange jacket. An expansion tube is formed at the top of the reaction tube. A first outlet on the bottom side of the expansion tube is connected to the separator inlet of the solid-liquid separator. The solid phase outlet of the solid-liquid separator is connected to the first inlet on the bottom side of the reaction tube. A second outlet at the top of the expansion tube of one of the adjacent reactor groups is connected to the second inlet on the bottom side of the reaction tube of the other reactor group. This application employs a new reaction medium and reaction conditions, improving reaction efficiency and yield, and features low gas-liquid backmixing, high production capacity per unit volume, and high safety.

The on-demand formation of Lewis base molecules for fabricating efficient and stable formamidinium lead iodide (FAPbI3)-based perovskite solar cells (PSCs). Semicarbazide hydrochloride (SECl) is incorporated as an additive in the perovskite precursor, which deprotonates to form semicarbazide (SE) molecules when needed to stabilize the intermediate 𝛿 phase. SE molecules protonate again to form SECl salt when they must be removed rapidly to accelerate the transition from the intermediate 𝛿 phase to the photovoltaic 𝛼 phase, leading to high film quality and homogeneous vertical distributions of A-site cations.

The hydrazine-containing composition is a liquid mixture that includes from 5 mol % to 95 mol % of unprotonated hydrazine selected from hydrazine, monomethylhydrazine, dimethylhydrazine, ethylhydrazine, and combinations thereof, and from 5 mol % to 90 mol % of at least one oxygen-containing solute or solvent selected from acetals, acetyls, alcoxyamines having two or more carbon atoms, aldehydes, amides, amides and particularly carboxamides, aminoalcohols, carbazides, semicarbazides, carbon-containing nitrate salts comprising cations with logarithmic dissociation constants less than 9.2, hydroxyalkyl nitro compounds, hydroxyalkylhydrazines, carbonates, carboxylic acids and anhydrides of carboxylic acids, esters, ethers, ketals, ketones, mono- and poly-alcohols in 31% or greater mass fraction, nitrate esters, nitrosamines, sugars, and combinations thereof. The unprotonated hydrazine has a first vapor pressure and the oxygen-containing solvent has a second vapor pressure that is less than the first vapor pressure.