88 results about "Nitroxide radical" patented technology

The invention discloses a polycarbonate / styrene composite material as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The composite material is prepared from the following raw materials: polycarbonate, silicon copolymerized polycarbonate, styrene resin, a halogen-free flame retardant, a polynitroxide free radical compound, an anti-dripping agent, an antioxidant and a lubricant. The molecular structure of the multi-nitroxide free radical compound contains at least two nitroxide free radicals, and the molecular chain of the multi-nitroxide free radical compound has a flexible carbon chain structure. The polycarbonate / styrene composite material provided by the invention can realize 0.5-1.0 mm ultrathin halogen-free flame retardance under the combined action of the halogen-free flame retardant and the multi-nitroxide free radical compound, and can meet the molding of ultrathin parts, and the prepared product has excellent damp-heat aging resistance and weather resistance, and is suitable for industrial production. The shell can be widely applied to new energy battery shells, power bank shells and the like.

The invention discloses an electrochemical water treatment method based on a TEMPO modified ceramic membrane, and belongs to the technical field of environmental organic pollution remediation. The electrochemical water treatment method comprises the following steps: arranging two TEMPO modified ceramic membranes as filtering membranes in electrochemical water treatment equipment at intervals, wherein the two filtering membranes are respectively connected with a positive electrode and a negative electrode of an alternating current system; the method comprises the following steps: adding a to-be-treated pollution solution into electrochemical water treatment equipment, and enabling the pollution solution to sequentially flow through two filtering membranes; and positive bias voltage and negative bias voltage parameters on the filter membrane are adjusted, so that the applied voltage is periodically and regularly switched between the positive bias voltage and the negative bias voltage, and organic pollutants in the polluted solution are removed. The TEMPO modified ceramic membrane comprises a conductive ceramic membrane TEMPO polymer coating layer, and a TEMPO polymer is a high-molecular polymer which is polymerized by taking 2, 2, 6, 6-tetramethylpiperidine oxide with nitroxide free radicals as a monomer. According to the water treatment method provided by the invention, organic pollutants in the polluted solution can be efficiently removed, and meanwhile, humus interference is resisted.

The invention discloses a method for preparing 2,2,6,6-tetramethylpiperidine nitroxide free radical compound and a reaction system and the obtained product, the method comprising: adding 2,2,6,6-tetramethylpiperidine to a reactor, adding or not adding an organic solvent and stirring and dissolving; adding a catalyst containing a modified titanium silicon molecular sieve, adding a hydrogen peroxide solution, 2,2,6,6-tetramethylpiperidine and hydrogen peroxide are subjected to an oxidation reaction; the catalyst is removed from the product obtained, and the liquid-phase product is desolvated to obtain 2,2,6,6-tetramethylpiperidine nitroxide free radical compound. The method provided by the present invention prepares 2,2,6,6-tetramethylpiperidine nitroxide free radical compound in a one-step reaction, has a high yield, is easy to purify the product, and has a high purity of the piperidine nitroxide free radical compound product, and the catalyst can be reused.

Inhibitor compositions for abating undesirable emulsion polymerization during processing of hydrocarbon stream laden with reactive vinylic monomers are provided. The polymerization inhibitor compositions include at least a first inhibitor compound having a stable nitroxide radical and a second inhibitor including phenylenediamine. Methods of inhibiting the polymerization of monomers using the compositions of the disclosure are also provided. The methods of inhibiting polymerization of monomers include a step of adding a composition of the disclosure to a process stream. The process stream includes an ethylenically unsaturated monomer that is suspended in the bulk-phase and highly polar solvents as distractive distillation solvents.

The invention discloses alkoxy amine and application of the alkoxy amine in induction of NMP (N-Methyl Pyrrolidone) polymerization of methacrylate monomers and styrene monomers. The alkoxy amine is a novel compound which is synthesized by taking benzaldehyde and isopropylamine as raw materials through three-step reaction of Schiff base reduction, oxidizing agent oxidation and free radical coupling. The obtained alkoxyamine can be used as a monomolecular initiator to effectively regulate and control controllable polymerization of methacrylate and styrene monomers under anaerobic or aerobic conditions, and the peak pattern of a gel chromatography outflow curve is symmetrical and has no obvious tailing phenomenon, so that the alkoxyamine can expand the range of nitroxide free radical polymerization regulation and control monomers, and the preparation method is simple and easy to implement. The method has a good application prospect in the aspect of synthesis of functional polymer materials.

The invention provides a composite polymerization inhibitor for a vinyl acetate production process, especially a rectification process, the polymerization inhibitor comprises a component A and a component B, the component A is a nitroxide free radical compound, and the component B is styrene. The composite polymerization inhibitor provided by the invention fully utilizes the synergistic effect of the two polymerization inhibitors, overcomes the defect of short high-temperature polymerization inhibition validity period of a nitroxide free radical type polymerization inhibitor, remarkably improves the polymerization inhibition effect of the polymerization inhibitor, can effectively prevent self-polymerization of vinyl acetate in the production process of vinyl acetate, and improves the production efficiency of vinyl acetate. And the continuity of the production process is ensured.

A method of forming a high internal phase emulsion (HIPE) foam is provided. A nitroxide-containing monomer can be used in combination with other monomers that can then be used to make a high internal phase emulsion foam upon curing. The nitroxide group can subsequently be used to control the radical polymerization of many monomers, which can be grafted from the surface of the high internal phase emulsion foam. The resulting foam can be useful in performing separations of radioactive species, metals, metal ions, multi-element ions, metal complexes, halides, and organic chemical species in chemical process streams, clean-up operations, etc.

Inhibitor compositions for abating undesirable polymerization during processing of hydrocarbon stream laden with reactive vinylic monomers are provided. The polymerization inhibitor compositions include at least a first inhibitor compound having a stable nitroxide radical and a second inhibitor including phenylenediamine. Methods of inhibiting the polymerization of monomers using the compositions of the disclosure are also provided. The methods of inhibiting polymerization of monomers include a step of adding a composition of the disclosure to the monomer. In some instances, the monomer is an ethylenically unsaturated monomer. Such ethylenically unsaturated monomers include, but are not limited to, vinyl acetate, acrylonitrile, acrylates, methacrylates, 1,3-butadiene, styrene, isoprene, (meth)acrylic acid, and combinations thereof. Methods of preparing the polymerization inhibitors and compositions of the disclosure are also provided.

The invention discloses a preparation method and electrochemical energy storage application of nitroxide free radical molecules with double redox active centers and analogues of the nitroxide free radical molecules, and belongs to the technical field of nitroxide free radical molecules. Through structural design of molecular bridging substituent groups, groups with multiple bridging points, such as quaternary ammonium groups and acylamino groups, are introduced to the fourth site of a piperidine ring, and the connection mode of the groups is modulated, such as linear or branched, so that controllable coupling of two redox active center units is realized. Researches show that the types, the number and the connection mode of the bridging groups have important influences on the oxidation-reduction potential, the electrochemical kinetics and the cycling stability of target molecules. The invention further discloses a charge-discharge mechanism and a degradation path of double-electron nitroxide free radical electrolyte molecules, and provides a theoretical basis and a practical basis for stable implementation of a double-electron transfer process. The research provides a brand new design thought and technical support for constructing organic flow battery electrolyte molecules with high energy density and long service life, and has a wide application prospect.

The invention relates to a resin composition and a product thereof, the resin composition at least comprises benzocyclobutene-modified hydrocarbon resin, modified hydrocarbon resin and a nitroxide-containing free radical compound, the benzocyclobutene-modified hydrocarbon resin contains carbon-carbon unsaturated bonds, the modified hydrocarbon resin does not contain unsaturated bonds, the tensile strength is more than 10 MPa, and the nitroxide-containing free radical compound contains nitrogen and oxygen radicals. The nitroxide free radical-containing compound has a # imgabs0 # structure, and X1 in the structure is an oxygen free radical or a hydroxyl group. In the resin composition, the nitroxide free radical-containing compound can promote benzocyclobutene modified hydrocarbon resin and high-tension-strength modified hydrocarbon resin to form a good interpenetrating network structure, the curing reaction speed and the fluidity are optimized, the curing reaction degree and the adhesive filling property are improved, the crosslinking degree is increased, the thermal expansion coefficient is reduced, and then the thermal expansion performance of the resin composition is improved. The Df of the circuit substrate prepared from the resin composition is less than 0.001 under 10GHz, and the circuit substrate has excellent interconnection structure reliability, thermal expansion coefficient and adhesive filling property.

A method for continuously producing oxetane methyl methacrylate by transesterification, which utilizes dibutyl tin oxide, methyl methacrylate and 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl radical to prepare a catalyst; methyl methacrylate is subjected to transesterification with 3-ethyl-3-oxetanemethanol, a polymerization inhibitor tetramethylpiperidine nitroxide phosphite triester and the catalyst to obtain a transesterification reaction liquid; the transesterification reaction liquid is subjected to vacuum rectification in a transesterification reactor, after recovering methyl methacrylate and 3-ethyl-3-oxetanemethanol, vacuum rectification is continued to obtain oxetane methyl methacrylate. The advantage is that the process is simple and reasonable, not only high in conversion rate and selectivity, but also high in purity, low in color and acid value of the obtained product, friendly to the environment and fully capable of meeting the application requirements in high-end fields.

Provided is a polarizing plate in which the decrease in transmittance in a high-temperature environment is suppressed. A polarizing plate has a polarizing element in which a dichroic dye is adsorbed and oriented in a polyvinyl alcohol-based resin layer, a first transparent protective film laminated on one face of the polarizing element, and a second transparent protective film laminated on the other face of the polarizing element, the polarizing element and the transparent protective films being bonded with a first adhesive layer formed from a first adhesive containing a first compound, the polarizing element and the second transparent protective film being bonded with a second adhesive layer formed from a second adhesive containing a second compound, the first compound being at least one selected from the group consisting of urea, a urea derivative, thiourea, and a thiourea derivative, and the second compound being a compound having a nitroxyl radical or a nitroxide radical.

The invention belongs to the technical field of synthesis of medicines and spices, and particularly relates to a synthesis method of trans-2-octenal. The synthesis method comprises the following steps: carrying out isomerization reaction on 1-octylene-3-alcohol under the catalytic action of 3, 4-dinitrobenzoic acid to obtain a trans-2-octylene-1-alcohol intermediate; the preparation method comprises the following steps: preparing trans-2-octenal from trans-2-octylene-1-alcohol under the oxidation action of m-chloroiodobenzene, 4-hydroxy-TEMPO (4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radical) and peracetic acid, and further preparing the trans-2-octenal from the trans-2-octylene-1-alcohol. The preparation method is mild in reaction condition, simple to operate and free of expensive reagents or catalysts.

The invention discloses a cyclic nitroxide free radical positive electrode electrolyte and a neutral aqueous organic flow battery, and belongs to the technical field of organic flow batteries. According to the positive electrode electrolyte, halide ions (such as chloride ions) in an existing supporting electrolyte are replaced by inorganic salt composed of anions such as sulfate ions and bis (trifluoromethanesulfonyl) imine ions, and the precipitation side reaction caused by the chloride ions in the charging and discharging process is avoided. Sulfate and bis (trifluoromethanesulfonyl) imine salt have wider electrochemical stability windows, and anions of the sulfate and bis (trifluoromethanesulfonyl) imine salt have a regulation effect on a free water structure, so that a more stable solvated water environment is favorably formed, strong solvating behaviors of H < + > and OH <-> are reduced, a decomposition reaction of water in the electrolyte is inhibited, and the tolerance of a system to pH fluctuation is improved; the working potential window of the electrolyte is widened, and the operation stability and the electrochemical performance of the flow battery under the neutral or near-neutral condition are improved. According to the scheme, a new material design thought and an application basis are provided for constructing a high-stability and high-safety aqueous organic flow battery.

The use of a cell-permeant molecular probe to assay the presence, and monitor the production, of the reactive oxygen species, superoxide, in red blood cells (RBCs) is described. The assay is performed using electron paramagnetic resonance (EPR) spectroscopy and a cell-permeant hydroxylamine spin trap. The cell-permeant molecular probe is not detected or quantifiable by EPR in its reduced form. However, upon entering the RBCs, the probe is oxidized by reacting with superoxide to yield a stable nitroxide radical that is detected and quantified using EPR. Our studies indicate that superoxide production is consistent with RBC metabolism that predicts lipid oxidation, membrane injury and poor post-transfusion performance. Therefore, measurement of reactive oxygen species can be used as an indicator of RBC quality at the time of donation and after storage.

The invention discloses a polymerization inhibitor for rectification of carboxylic acid vinyl ester. The polymerization inhibitor is a composite polymerization inhibitor composed of a polyphenol polymerization inhibitor, a nitroxide free radical compound and an arylamine polymerization inhibitor. The composite polymerization inhibitor prepared by the invention has good solubility in a carboxylic acid vinyl ester system; the polymerization inhibition efficiency in the induction period is high, and meanwhile, the induction period is prolonged, that is, the polymerization inhibition lasting validity period of the polymerization inhibitor in a carboxylic acid vinyl ester rectification process is long.

The present invention belongs to the technical field of organic chemical synthesis, and specifically relates to a rhein nitroxide derivative, a synthesis method, and an application thereof. The present invention uses rhein, an antioxidant pharmacological substance from the traditional Chinese medicine rhubarb, as a research object, selects its carboxyl group at position 3 as a modification site, and introduces four active intermediate nitroxides into the rhein structure based on the amide condensation and esterification reaction mechanisms and the pharmacophore splicing principle. Thirty rhein nitroxide derivatives were designed and synthesized, thereby establishing a method for synthesizing novel rhein nitroxide derivatives with mild reaction conditions, environmental friendliness, and high yield. The provided novel rhein nitroxide derivatives have the ability to scavenge DPPH and ABTS free radicals, have a protective effect on oxidatively damaged cells, and have the ability to delay the lifespan of Caenorhabditis elegans. Their effects are superior to those of rhein, providing a new approach for the development of antioxidant and anti-aging drugs.

The invention discloses a method for preparing 2, 5-furandicarboxylic acid under mild conditions, which comprises the following steps: in a water phase system, by taking bifunctional furan aldol as a raw material, a nitroxide free radical compound and nitrate as catalysts and bromine-containing inorganic salt as a promoter, oxidizing the bifunctional furan aldol under the action of an oxidizing agent to obtain the 2, 5-furandicarboxylic acid. And 2, 5-furandicarboxylic acid is obtained. The method is mild in reaction condition, can realize high conversion rate and high yield at room temperature, and has the advantages of low energy consumption and safe process; the used solvent is a water phase, no organic solvent is needed, and the method has the advantages of being green, environmentally friendly, low in price, high in safety, non-toxic and the like. The method avoids the adverse factors of organic solvent and high temperature in the conventional oxidation preparation process of the FDCA, and is a new process for preparing the FDCA.

This invention relates to a high-efficiency outdoor flame retardant additive, its preparation method, and its application, belonging to the field of polymer material additives technology. This high-efficiency flame retardant additive has N,N'-di(3-aminopropyl)-1,2-ethylenediamine as its main chain, linked with dialkoxy-monochlorotriazine, containing six N-cyclohexyloxy hindered amine groups, with a purity ≥99.5% and a total yield ≥80%. It is prepared from 2,2,6,6-tetramethylpiperidone nitroxide radical, cyclohexane, etc., via N-cyclohexyloxylation, reductive amination, N-acylation, and nucleophilic substitution reactions. Adding 0.5~3.0 wt% of this stabilizer to polypropylene materials can impart UL-94 VTM-0 flame retardancy and excellent photothermal stability. Furthermore, the preparation process is low-cost and environmentally friendly, solving the technical problems of easy deactivation of hindered amines, functional separation of additives, and low yield in traditional synthesis processes. It is suitable for polypropylene fibers, films, nonwoven fabrics, and other polyolefin products.

The invention belongs to the technical field of binders, and particularly relates to a composite binder, the composite binder comprises a block copolymer and polyvinylidene fluoride, the block copolymer comprises a first block and a second block, the first block is a prepolymer of 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radicals and polyethylene oxide, the second block is a prepolymer of 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radicals and polyethylene oxide, and the third block is a prepolymer of 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radicals and polyethylene oxide. And the second block is polystyrene. According to the composite binder, the solubility of the block copolymer in an electrolyte is controlled by regulating and controlling the molecular weight of the block copolymer and the polystyrene, the binding power of an active substance and a pole piece is improved in a working temperature interval, the block copolymer only swells to a certain degree in the temperature interval and cannot be dissolved, and the liquid retention performance of a battery cell can be improved. And when the internal heat accumulation temperature of the battery cell abnormally rises and exceeds the dissolvable temperature of the block copolymer, the block copolymer can be gradually dissolved in the electrolyte, so that the viscosity of the electrolyte is increased and gelatinized, the reaction degree of the electrolyte is reduced, and the risk of thermal runaway is prevented.

The invention discloses a preparation method of 2, 2, 6, 6-tetramethyl-4-methoxypiperidine nitroxide free radicals, which comprises the following steps: in a reaction container equipped with a nitrogen protection system, dissolving tetramethyl-4-hydroxypiperidine nitroxide free radicals in 2-methyltetrahydrofuran, and maintaining the reaction system in an inert environment by the nitrogen protection system; adding a supported sodium hydride catalyst into the reaction system, wherein the molar ratio of the supported sodium hydride catalyst to the tetramethyl-4-hydroxypiperidine nitroxide free radical is (1.0-1.5): 1; the preparation method comprises the following steps: adding 2, 2, 6, 6-tetramethyl-4-methoxypiperidine into a reaction kettle, dropwise adding methyl iodide, stirring for 4-6 hours, separating an organic phase, and crystallizing to obtain the 2, 2, 6, 6-tetramethyl-4-methoxypiperidine nitroxide free radical. According to the preparation method provided by the invention, the supported sodium hydride catalyst is introduced, and the 2-methyltetrahydrofuran solvent system is combined, so that the reaction efficiency and safety are remarkably improved. According to the preparation method provided by the invention, through nitrogen protection and staged purging, low-temperature crystallization and explosion-proof equipment control, the generation amount of hydrogen is reduced, and the concentration of solvent vapor is reduced.

The invention discloses a preparation method of sulfoalkyl (methyl) acrylate, which is characterized in that (methyl) acrylic acid and hydroxyalkyl sulfonic acid are used as raw materials, an acidic resin catalyst is adopted, and the sulfoalkyl (methyl) acrylate is prepared by reaction in the presence of a solvent and a compound polymerization inhibitor, the compound polymerization inhibitor is a combination of a phenolic compound and at least one of the following compounds (A)-(D): (A) a quinone compound; (B) a nitroxide radical compound; (C) an inorganic salt compound; and (D) copper N, N-di-n-butyl dithiocarbamate. By using the method, the polymerization side reaction in the reaction process can be effectively inhibited, and the method has the advantages of short reaction time, simple post-treatment and low content of the hydroxyalkyl sulfonic acid dimer in the product.

The present invention relates to the technical field of epoxy resin synthesis, and specifically relates to a halogen-free flame-retardant epoxy resin and a preparation method thereof. In the present invention, a flame retardant is prepared by adding 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, N-tert-butylacrylamide, tetramethylpiperidine nitroxide phosphite, triethylamine, tetrahydrofuran and phenethyltrichlorosilane. Then, using anhydrous magnesium sulfate, aluminum sulfate octadecahydrate, sodium hydroxide, anhydrous sodium carbonate, the flame retardant and deionized water as raw materials, a composite flame retardant is prepared. The epoxy resin and the composite flame retardant are subjected to high-temperature mechanical blending, and then 4,4'-diaminodiphenylmethane is added, and after vacuum degassing and stepwise curing, the finished product is prepared. The finished product prepared by the present invention has good flame retardancy and environmental protection effects, and thus has broad application prospects in the technical field of epoxy resin synthesis.

This invention discloses a fluoropiperidine nitroxide radical derivative, a positive electrode electrolyte containing the same, and its applications. The fluoropiperidine nitroxide radical derivative is a compound represented by Formula I. The piperidine nitroxide radical derivative of this invention exhibits high stability and high solubility as a positive electrode active material in organic flow batteries, showing promising application prospects.

Provided are: a method for producing a resin, the method having (i) a step for polymerizing raw material monomers including specific monomers described in the description, in the presence of a nitroxide radical or a dithioester-based compound, wherein in step (i), a reaction solution containing a solvent, an initiator at a quantity of 80 mass% or more of the total initiator amount and a nitroxide radical or a dithioester-based compound at a quantity of 90 mass% or more of the total nitroxide radical or dithioester-based compound amount is charged in a reaction vessel, and at least some of the raw material monomers are added dropwise to the reaction solution at a temperature that is not lower than the decomposition temperature of the initiator; a method for producing an active light ray-sensitive or radiation-sensitive resin composition, which includes the method for producing a resin; an active light ray-sensitive or radiation-sensitive resin composition; an active light ray-sensitive or radiation-sensitive resin film obtained using the active light ray-sensitive or radiation-sensitive resin composition; a pattern formation method; and a method for manufacturing an electronic device.

This application provides a semiconductive shielding material, its preparation method and application, and cables, belonging to the field of cable material technology. The semiconductive shielding material comprises the following components in parts by weight: 50-65 parts matrix resin, 25-35 parts conductive carbon black, 5-10 parts acrylate-terminated polyalphaolefin, 1-3 parts antioxidant, 1-2 parts dispersant, 0.1-1 parts thermally triggered free radical stabilizer, and 0.5-2 parts crosslinking agent; wherein the thermally triggered free radical stabilizer includes nitroxide free radical compounds. The combined use of these components significantly improves the scorching resistance, crosslinking density, and mechanical properties of the semiconductive shielding material, exhibits excellent processability, and significantly enhances the safety and service life of cables. The introduction of acrylate-terminated polyalphaolefin and the thermally triggered free radical stabilizer is beneficial for improving melt flowability and inhibiting early crosslinking during processing, and for forming a highly dense three-dimensional network structure during the crosslinking stage.

The invention discloses a dimerization nitroxide free radical type flow battery positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out Favorskii rearrangement reaction and extraction on 4-oxo TEMPO, an iodine solution and potassium hydroxide dissolved in ammonia water to obtain pyrrole amide, preparing pyrrole carboxylic acid by utilizing the pyrrole amide, preparing pyrrole dimethyl amide by utilizing the pyrrole carboxylic acid, and then preparing the pyrrole dimethyl amide by utilizing the pyrrole dimethyl amide. Dissolving pyrrole dimethyl amide, adding a lithium aluminum hydride solution, carrying out a reduction reaction to prepare pyrrole methylene dimethyl tertiary amine, and finally carrying out a substitution reaction on the pyrrole methylene dimethyl tertiary amine and the dimer bridging intermediate to prepare the positive electrode material disclosed by the invention. The preparation method is simple in synthesis process and relatively high in reaction yield, and the problem of capacity fading caused by transmembrane permeation of the positive electrode material of the flow battery can be effectively inhibited.

The invention discloses a UV (ultraviolet) curing hot-melt pressure-sensitive adhesive with high cohesive strength. The UV curing hot-melt pressure-sensitive adhesive comprises butyl acrylate, 2-ethylhexyl acrylate, acrylic acid, a benzophenone derivative containing carbon-carbon double bonds, a solvent, an initiator BPO (benzoyl peroxide) and a nitroxide free radical TEMPO. Butyl acrylate and 2-ethylhexyl acrylate are used as main monomers, acrylic acid is used as a functional monomer, the inherent viscosity characteristic of an acrylic pressure-sensitive adhesive is reserved, the initial binding force with a base material is ensured, and a benzophenone derivative containing carbon-carbon double bonds has the dual functions of photo-initiation activity and cross-linking reaction point positions and can be copolymerized with the monomers to realize UV cross-linking; the nitroxide free radical TEMPO captures free radicals at low temperature and releases free radicals at high temperature, so that the molecular weight distribution is uniform, the initiator BPO and the solvent synergistically guarantee stable polymerization, the product is low in melt viscosity at 130-150 DEG C, small molecular chain segments are few, the molecular weight is large under the combined action of the three, and the hot-melt coating is realized while the cohesion strength is high.