91 results about "Hydantoin" patented technology

The invention discloses a medical washable high-temperature-resistant modified polyester fiber fabric and a preparation method thereof, and relates to the technical field of fabrics. The medical washable high-temperature-resistant modified polyester fiber fabric prepared by the invention is obtained by blending, spinning and weaving modified polyester and modified mica and activating with sodium hypochlorite; the modified polyester is obtained by grafting organic silicon modified polyester with n-dodecanethiol and then reacting with bromooctylhydantoin; the modified mica is prepared by polymerizing diethyl phosphite and bisphenol S on the surface of the pretreated mica, grafting a vinyl monomer and then reducing; the vinyl monomer is obtained by carrying out a reaction on 1-allyl-3-cyano-6-hydroxy-4-methyl-2-pyridone and an azo salt, and the vinyl monomer is obtained by carrying out a reaction on 1-allyl-3-cyano-6-hydroxy-4-methyl-2-pyridone and an azo salt; the medical washable high-temperature-resistant modified polyester fiber fabric prepared by the invention has good antibacterial, anti-aging and flame-retardant properties.

The present invention belongs to the technical field of mechanochromic materials, and specifically relates to a mechanochromic material containing rhodamine with a hydantoin structure, and its preparation method and application. The rhodamine mechanochromic material containing a hydantoin structure is shown in structure (I), with rhodamine B as the matrix, reduced to rhodamine alcohol, oxidized to generate rhodamine aldehyde, and reacted with hydantoin to prepare a six-membered spirocyclic rhodamine containing a hydantoin structure. The rhodamine compound containing a hydantoin structure involved in the present invention has good ion interference resistance, exhibits photochromic properties in a dichloromethane solvent, and has the properties of mechanical stress discoloration and solvent mixing stress discoloration with high contrast and good repeatability. The solid powder of the rhodamine mechanochromic material containing a hydantoin structure has the characteristic of changing color upon grinding. After the action of mechanical force, the color of the powder changes from yellow to pink, and a reversible color change is achieved during the grinding-heating process.

The invention relates to the technical field of plastic waste recovery, in particular to automatic recovery equipment for hydantoin epoxy resin waste. Comprising a shell, the shell is fixedly connected with a first guide plate and a second guide plate, the shell is fixedly connected with a baffle, the shell is provided with a first electromagnetic sliding rail, a first electromagnetic sliding block is slidably connected into the first electromagnetic sliding rail of the shell, the first electromagnetic sliding block is fixedly connected with an extrusion plate, and the shell is provided with a second electromagnetic sliding rail. The second electromagnetic sliding rail of the shell is in sliding connection with a second electromagnetic sliding block, and the second electromagnetic sliding block is fixedly connected with an extrusion frame. The extrusion plate and the extrusion frame drive one side of waste to reciprocate, so that the waste is continuously bent, epoxy resin on the waste is continuously crushed and falls off, the epoxy resin recycling efficiency is improved, the waste is not directly crushed, the content of waste impurities in the recycled epoxy resin is reduced, and the epoxy resin recycling quality is improved.

A method for controlling a chemical process, by preparing methanol, hydrogen sulfide, methyl mercaptan, hydrocyanic acid, acrolein, 3-methylthiopropionaldehyde, 5-(2-methylmercaptoethyl)-hydantoin, methionine, a salt of methionine, and a derivative of methionine. The method includes providing a training set TS1, wherein TS1 is process values PV1 and process values PV2 being correlated to one another, and / or laboratory values LV1 and process values PV2 being correlated to one another. The method includes training a processing unit on the training set TS1 to identify a pattern of correlation between one or more measured process variables and at least one process variable. The method includes developing a calibration function CF1 for a calibrated soft sensor from the identified pattern of correlation and predicting at least one operating parameter for the chemical process as an approximation to LV1 and / or PV1. A system for controlling a chemical process.

The invention discloses a preparation method of 1-(3-chloropyrazolo [1, 5a]-4, 5, 6, 7-tetrahydropyridine-2-yl)-5-amino-1H-pyrazole-4-formonitrile, which comprises the following steps: taking 1-(3-pyrazolo [1, 5a]-4, 5, 6, 7-tetrahydropyridine-2-yl)-5-amino-1H-pyrazole-4-formonitrile as an initial raw material, and reacting with dichlorohydantoin in an organic solvent to prepare the 1-(3-chloropyrazolo [1, 5a]-4, 5, 6, 7-tetrahydropyridine-2-yl)-5-amino-1H-pyrazole-4-formonitrile. The preparation method comprises the following steps: adding 2-(4-(4-(4-(4-(4-(4-(4-(4-(4-(4-(4-(4- According to the preparation method disclosed by the invention, the raw materials are green and environment-friendly, and the prepared 1-(3-chloropyrazolo [1, 5a]-4, 5, 6, 7-tetrahydropyridine-2-yl)-5-amino-1H-pyrazole-4-formonitrile is environment-friendly in process, high in yield, high in purity and low in cost.

The subject matter described herein is directed to myelin-promoting compounds of Formula I and pharmaceutical salts thereof, methods of preparing the compounds, pharmaceutical compositions comprising the compounds, and methods of administering the compounds for the treatment of disorders, such as myelin-related disorders.

The invention relates to the technical field of cyanide-free silver plating solutions and preparation, and discloses a cyanide-free silver plating solution based on composite coordination and double-pulse fine regulation and a preparation method thereof.The cyanide-free silver plating solution comprises silver salt, a composite coordination agent, supporting electrolyte, a pH regulator and a composite functional additive, the silver salt provides silver ions with the concentration being 15-50 g / L, and the composite coordination agent provides silver ions with the concentration being 15-50 g / L; the composite coordination agent is composed of 80-140 g / L of a hydantoin main coordination agent and 15-30 g / L of a nitrogen heterocyclic amide auxiliary coordination agent, the concentration of the supporting electrolyte is 75-130 g / L, the supporting electrolyte is used for enhancing the conductivity of the plating solution, and the pH regulator is used for maintaining the pH value of the plating solution within the alkaline range of 9.0-11.5; the composite functional additive comprises 0.5-4 g / L of a main brightener, 0.1-1.5 g / L of an auxiliary brightener and 5-25 g / L of a grain refiner, and is used for improving the glossiness and compactness of a plating layer; through the preparation method, the difficulty and cost of wastewater treatment during solution plating can be reduced, the environmental protection effect is improved, and the stability of the plating solution during long-term use is improved.

This invention discloses a method for preparing sodium ketovaline, belonging to the field of chemical synthesis technology, including the following steps: using hydantoin and acetone as raw materials, and using a solid base catalyst K / MgAlO x Using sodium hydroxide as the main catalyst and a solvent as the co-catalyst, a condensation reaction is carried out in the presence of a solvent. After the condensation reaction is completed, a certain amount of sodium hydroxide is added, and the hydrolysis reaction is continued under the catalysis of a solid base catalyst to prepare sodium ketovaline. This invention can effectively improve the yield of sodium ketovaline, and the catalyst can be recycled.

The application discloses a crosslinking agent for degradable hydrogel and a preparation method of degradable polyacrylamide hydrogel based on the crosslinking agent; the crosslinking agent for degradable hydrogel is composed of hydantoin epoxy resin, N, N-dimethyl benzylamine and acrylamide; the degradable polyacrylamide hydrogel prepared by using the crosslinking agent comprises acrylamide, 1.8-4.6 parts of water, potassium persulfate and the crosslinking agent; the crosslinking agent for degradable hydrogel can realize the preparation of the degradable hydrogel by chemical crosslinking method, and by adjusting the crosslinking agent, the degradable hydrogel prepared based on the crosslinking agent is applicable in the temperature environment range of normal temperature to 150 DEG C, the degradable hydrogel has selectivity to gel breaking liquid, and can realize gel breaking only by adding alkaline gel breaking liquid, and the gel breaking time is adjustable in the range of 90 min to 72 h; in addition, the crosslinking agent and the preparation method of the hydrogel are simple, the conditions are easy to control, and have good market application and promotion prospect.

The present invention relates to the field of chemical technology, and more particularly to a method for synthesizing a hydantoin epoxy resin. Specifically: (1) 5,5-dimethylhydantoin, sodium hydroxide and water are mixed as a standby solution; (2) 1,2,3,4-diepoxybutane, isopropyl alcohol and benzene are sequentially added to a reaction tank and heated to 50-150°C, and kept under reflux for 4h; (3) the standby solution is added dropwise to the reaction tank, and the reaction is continued after the addition is completed, the viscosity of the solution is tested, and the reaction is stopped when it reaches 5-30cp; (4) isopropyl alcohol and benzene are distilled off under reduced pressure to obtain a crude hydantoin epoxy resin; (5) the crude product is refined, and a fine product is obtained after removing sodium hydroxide. The hydantoin epoxy resin obtained by the method has two hydroxyls, is more water-soluble, and has no ether bond and benzene ring, so it has excellent UV resistance and heat resistance, and can be used to produce a water-based epoxy resin coating with good weather resistance, low toxicity and high thermal stability.

The invention discloses a whitening facial cleanser and a preparation method thereof, and relates to the field of skin care products. The whitening facial cleanser is prepared from 35 to 42 weight percent of a cleaning agent, 1 to 2 weight percent of a whitening and freckle-removing agent, 0.8 to 1.2 weight percent of a skin conditioner, 4 to 8 weight percent of an emollient, 4 to 6 weight percent of a humectant, 0.3 to 0.5 weight percent of a preservative, 0.05 to 0.1 weight percent of a chelating agent, 4 to 4.5 weight percent of a thickening agent, 0.2 to 0.5 weight percent of an aromatic, 0.8 to 1.0 weight percent of a pH regulator and the balance of a solvent. The cleaning agent is prepared from sodium lauroyl isethionate, sodium cocoyl aminopropionate, cocamidopropyl betaine and sodium lauroyl sarcosinate according to the weight ratio of (3.5 to 4.5) to 1 to 1 to 1; the preservative comprises DMDM hydantoin and methylparaben in a weight ratio of (3-4): 1. The whitening facial cleanser provided by the invention has both cleaning power and mildness, and also has a whitening effect.

Embodiments of the present application provide an electroplating solution for a gold-silver alloy and a use thereof. The electroplating solution comprises a gold ion source, a silver ion source, a first complexing agent, and a second complexing agent, wherein the first complexing agent comprises a hydantoin-based substance, and the second complexing agent comprises an organic sulfonic acid or a salt thereof. By means of a synergistic effect of the two types of complexing agents, the electroplating solution exhibits relatively high stability and can specifically inhibit electrodeposition of silver without affecting deposition of gold, thereby reducing the influence of current density fluctuations on the gold content in an alloy coating. Thus, an alloy coating having a gold content stably maintained within a range of 30-50 wt% can be produced over a relatively wide current density range having an interval width of at least 0.3 ASD.

Compounds that contain an ethylenically unsaturated group, an active-hydrogen group, and an aspartate group and / or hydantoin group are described. Also disclosed are methods for producing and using such compounds, such as their use in coating compositions, such as coating compositions suitable for application to optical glass fiber substrates.

The invention relates to a guanidino hydantoin methanesulfonate nonlinear optical crystal as well as a preparation method and application thereof. The molecular formula of the crystal is C3N3OH < 6 > (CH3SO3), the molecular weight is 195.2, the crystal belongs to an orthorhombic system, the space group is P212121, and the cell parameters are as follows: a = 5.5142 (5), b = 8.6892 (7), c = 17.4413 (16), alpha = 90.00 degrees, beta = 90.00 degrees, gamma = 90.00 degrees, Z = 4 and V = 820.5 (3) 3. Under the irradiation of 1064nm laser, the powder frequency-doubled effect of the crystal is about 3-5 times that of KH2PO4 (KDP), the ultraviolet absorption edge of the crystal is about 217nm, and the experimental birefringence is about 0.08-546nm. And growing crystals with the size of more than centimeter by adopting an evaporation method, an aqueous solution cooling method or a solvothermal method. The crystal is simple in preparation method and low in cost, has a relatively large nonlinear optical effect, a relatively large birefringence and a wide transmission range, is easy to grow and process, and can be used as an ultraviolet nonlinear optical crystal and a birefringence crystal.

A polyoxymethylene polymer composition containing a formaldehyde stabilizer package is disclosed. In one embodiment, the formaldehyde stabilizer comprises a substituted hydantoin, it has been found that the substituted hydantoin alone or a combination of a substituted hydantoin with another emission control agent significantly reduces formaldehyde emissions. When the polymer composition does not contain calcium stearate, the formaldehyde emission is low.

The invention discloses a continuous preparation process of bromochlorohydantoin, and belongs to the technical field of bromochlorohydantoin production, 5, 5-dimethylhydantoin, water and liquid caustic soda are mixed and then enter a two-section microchannel reactor and a one-section tubular reactor respectively to react with bromine, chlorine and a phase transfer catalyst, and a finished product bromochlorohydantoin is prepared; by utilizing the method, high-purity bromochlorohydantoin can be obtained, the production yield is high, and due to the adoption of continuous production, the production process is easy to control, the energy consumption is reduced, the production efficiency is improved, and meanwhile, the safety and controllability of the production process are also realized.

The application discloses a kind of electroplating gold tin alloy plating solution stabilizer.The components of the stabilizer include: 3,4-dihydroxyphenethyl alcohol, 1-amino hydantoin, cysteine and D-2,3,5,6-tetrahydroxy-2-hexenoic acid-gamma-lactone.The plating solution stabilizer described in the application has the characteristics of simplicity, non-toxic, low dosage concentration and low cost, and is suitable for large-scale industrial production.In the electroplating solution added with the electroplating gold tin alloy plating solution stabilizer of the application, the stability of the alloy ratio in the plating layer can be greatly improved without changing the original surface state of the plating layer and the electroplating rate, so that the gold tin alloy plating layer with the best performance can be stably obtained in industrial production, the production efficiency and product quality are improved, the stability of the plating solution is greatly improved, the plating solution can be stored and used for a long time without precipitation, discoloration and other phenomena in a short time, the production cost is reduced, and the environment is protected.

A purpose of the present invention is to provide a method for producing a glycoside compound having a high purity. The present invention provides a method for producing a glycoside compound represented by formula (3) (wherein Ba, i-Pr and n are the same as those defined below), which comprises reacting a glycoside compound of formula (1) (wherein Ba represents an adenine group which may be optionally substituted with an acyl group, and i-Pr represents an isopropyl group) with an ether compound of formula (2) (wherein R1 represents a C1-C6 alkyl group or a phenyl group, and n is 0 or 1) in one or more solvents selected from tetrahydropyran and 4-methyltetrahydropyran in the presence of one or more halogenated agents selected from halogen, N-halogenated succinimide, and N-halogenated hydantoin.

The invention belongs to the technical field of sludge treatment, and provides a method and a system for strengthening sludge cracking and producing medium-chain fatty acid. The method comprises the following steps: concentrating sludge, mixing the concentrated sludge with halogenated hydantoin, and cracking to obtain cracked sludge; and carrying out two-stage fermentation treatment on the cracked sludge to obtain the medium-chain fatty acid. According to the method, halogenated hydantoin is adopted as a pretreatment agent for cracking the sludge, and through spontaneous combination of halogenated hydantoin molecules and the sludge extracellular polymeric substances, tight combination type extracellular polymeric substances and cell walls are remarkably oxidized and damaged; meanwhile, hypochlorous acid is slowly released to maintain a proper oxidative stress effect to stimulate the biological metabolism effect of anaerobic microorganisms, hydrolysis and acidification of organic matters are promoted, and a large number of electron acceptors are provided for microorganisms participating in carbon chain extension to produce MCFA subsequently. The method is simple, low in cost, small in medicament demand and beneficial to promoting efficient resource utilization of the sludge.

A metal oxide varistor (MOV) device including a MOV chip, electrically conductive first and second electrodes disposed on opposite sides of the MOV chip, electrically conductive first and second leads connected to the first and second electrodes, respectively, and an arc mitigating, flame retarding coating covering the MOV chip, the first and second electrodes, and portions of the first and second leads, the arc mitigating, flame retarding coating comprising a silicone composition formed of a filler material suspended in a silicone resin, wherein the filler material includes one or more of melamine, guanidine, guanine, hydantoin, allantoin, urea, melamine-formaldehyde, melamine-cyanurate polymer, and boric acid.

The application relates to the technical field of plastic waste recycling, in particular to automatic recycling equipment for hydantoin epoxy resin waste. The equipment comprises a shell, the shell is fixedly connected with first and second guide plates, the shell is fixedly connected with a baffle, the shell is provided with a first electromagnetic slide rail, a first electromagnetic slide block is slidably connected in the first electromagnetic slide rail of the shell, the first electromagnetic slide block is fixedly connected with an extrusion plate, the shell is provided with a second electromagnetic slide rail, a second electromagnetic slide block is slidably connected with the second electromagnetic slide rail of the shell, and the second electromagnetic slide block is fixedly connected with an extrusion frame. The extrusion plate and the extrusion frame drive one side of the waste to reciprocate, the waste is continuously bent, the epoxy resin on the waste is continuously broken and falls off, the efficiency of epoxy resin recycling is improved, the waste is not directly broken, the content of waste impurities in the recycled epoxy resin is reduced, and therefore the quality of the recycled epoxy resin is improved.

The application discloses a kind of integrated circuit chip package lead frame's electroless gold plating solution and its gold plating method, it is related to integrated circuit chip packaging field.Therein, electroless gold plating solution is following concentration component aqueous solution: water-soluble gold compound, with Au, concentration is 1-1.5g / L;Sodium hypophosphite 10~20g / L;Malic acid 15~20g / L;Citric acid 15~20g / L;N,N'-bis (2-hydroxyethyl) ethylenediamine 10~15g / L;Triammonium citrate 15~20g / L;EDTA-2Na 5~10g / L;5,5'-dimethyl hydantoin 5~10g / L;Metal ion catalyst, with metal ion, concentration is 2~3ppm;Mercaptoimidazole 0.01~0.015g / L;Hexamethylenetetramine 5~10g / L.The electroless gold plating solution in the application can consider stability, high deposition rate and plating layer deposition uniformity.

To provide: diarylhydantoin compounds, including diarylthiohydantoins; methods for synthesizing them; and methods for using them in the treatment of hormone refractory prostate cancer.SOLUTION: A method for treating a hyperproliferative disorder comprises administering a pharmaceutical composition of the present invention to a subject in need of such treatment, thereby treating the hyperproliferative disorder. The invention provides a series of compounds having strong antagonistic activities with minimal agonistic activities against AR.SELECTED DRAWING: None

The invention discloses a preparation method of ketovaline sodium, which belongs to the technical field of chemical synthesis, and comprises the following steps: by taking hydantoin and acetone as raw materials, a solid base catalyst K / MgAlOx as a main catalyst and sodium hydroxide as a cocatalyst, carrying out condensation reaction in the presence of a solvent, after the condensation reaction is completed, adding a certain amount of sodium hydroxide, and carrying out a reaction for 2-4 hours to obtain ketovaline sodium. Continuously carrying out hydrolysis reaction under the catalysis of the solid base catalyst to prepare ketovaline sodium; according to the method, the yield of the ketovaline sodium can be effectively improved, and meanwhile, the catalyst can be recycled.

An enzymatic method for the production of an L-glufosinate P-alkyl ester can be performed. This method is characterized by reacting an L-glufosinate P-alkyl ester carbamoylate to give the corresponding L-glufosinate P-alkyl ester. This is catalyzed by a carbamoylase. The L-glufosinate P-alkyl ester carbamoylate employed may be obtained by a reaction from the corresponding L-glufosinate hydantoin P-alkyl ester. This is catalyzed by a hydantoinase, preferably an L-enantioselective hydantoinase. In a second aspect, an enzymatic method for enantioselective production of an L-glufosinate P-alkyl ester from a mixture MIIIA of L- and D-glufosinate P-alkyl ester hydantoins can be performed. The L-glufosinate P-alkyl ester obtained in the methods according to the first or second aspect of the invention may be saponified to give L-glufosinate.

Engineered hydantoinase variants and uses of the engineered hydantoinase variants in biocatalytic production of L-glufosinate are provided. L-glufosinate is produced by hydrolyzing a 5-substituted hydantoin with a hydantoinase engineered to exhibit enhanced L-enantioselectivity to form a carbamoyl-containing compound and then cleaving the carbamoyl group with an L-stereospecific carbamoylase. The L-glufosinate thus produced may be utilized as an herbicide for agriculture.

The invention discloses a synthetic method of halogenated polystyrene hydantoin. The synthetic method is a one-step synthetic method. The preparation method comprises the following steps: firstly, preparing a raw material for synthesizing halogenated polystyrene hydantoin, and synthesizing 1-halogen-5, 5-dimethyl hydantoin from 5, 5-dimethyl hydantoin and halogen under an alkaline condition; halogenated polystyrene hydantoin, namely 1-halogen-3-(4-polystyrene-benzyl)-5, 5-dimethyl hydantoin, is synthesized from chloromethyl polystyrene and monohalogenated dimethyl hydantoin in one step, so that the synthesis efficiency is high, the cost is low, and large-scale production is facilitated. Meanwhile, halogenated polystyrene hydantoin is synthesized in the solvent, so that swelling of polystyrene is facilitated, the yield is increased, the reaction time is short, the synthesis efficiency is high, and the cost is greatly reduced. The mother liquor is recycled, and the mother liquor contains a large amount of materials during preparation, so that waste liquid discharge is avoided, and the wastewater treatment cost is reduced; and waste is turned into wealth, so that the cost is reduced, the waste can be recycled for multiple times, the wastewater output is reduced, and the wastewater treatment cost and the production cost are further reduced.

The invention relates to the technical field of layered composite fabrics, and discloses a composite fabric based on a functional coating and a preparation method of the composite fabric. Epoxidized hydantoin and chitosan are grafted with epoxidized nano-silver to prepare hydantoin chitosan modified nano-silver with good antibacterial performance, then vanillin is used for blocking polyurethane containing disulfide bonds to obtain vanillin modified polyurethane, the hydantoin chitosan modified nano-silver and the vanillin modified polyurethane are cross-linked, and the nano-silver modified vanillin polyurethane is prepared. The composite fabric prepared by compounding the formed functional coating and the base cloth has excellent antibacterial performance.

The invention relates to a hydantoin-containing deoxyuridine triphosphatase inhibitor and a preparation method thereof. Provided herein are dUTPase inhibitors, compositions comprising these compounds, and methods of using these compounds or compositions.

The invention provides a preparation method of 2, 4, 6, 8-tetrahydroxypyrimido [5, 4-d] pyrimidine, and belongs to the technical field of medicinal chemistry. The method provided by the invention comprises the following steps: mixing hydantoin and oxalyl urea, and carrying out Knoevenagel reaction to obtain a double five-membered ring intermediate; mixing the double five-membered ring intermediate with an alkaline solution, then carrying out a rearrangement reaction, then mixing a solution obtained by the rearrangement reaction with a hydrochloric acid solution, and then carrying out solid-liquid separation to obtain a crude product; and sequentially pulping and drying the crude product to obtain the 2, 4, 6, 8-tetrahydroxypyrimido [5, 4-d] pyrimidine. The method provided by the invention has the advantages of easily available raw materials, simple operation, safe process and less three wastes, and is suitable for industrial production.