122 results about "Meta-aminophenol" patented technology

Compositions for the oxidative dyeing of keratin fibers, in particular human keratin fibers, comprising (A) a 1-hexyl/heptyl-4,5-diaminopyrazole compound of the general formula (I), its physiologically compatible water-soluble salt, or mixtures thereof and; (B) a m-aminophenol compound of the general formula (II), its physiologically compatible water-soluble salt, or mixtures thereof; and (C) an oxidizing agent.

wherein R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈ and R₉ are as defined herein and a=1 or 2.

The invention provides a preparation method of meta-aminophenol-formaldehyde resin spheres and a preparation method of carbon spheres. Meta-aminophenol and formaldehyde are subjected to polymerization reaction in the presence of ammonia water and/or ethylene diamine. In the polymerization reaction process, the formaldehyde, the meta-aminophenol and the ammonia water and/or ethylene diamine as the catalyst form a micelle in the solvent; in the micelle, the meta-aminophenol and the formaldehyde are subjected to polymerization reaction under the catalytic action of the ammonia water and/or ethylene diamine to obtain the meta-aminophenolformaldehyde resin spheres; and meanwhile, part of the ammonia water and/or ethylene diamine are/is distributed on the surface of the micelle to form positive charges, and the electrostatic repulsion action inhibits the bonding of the micelle. Thus, the obtained meta-aminophenol-formaldehyde resin spheres have high monodispersity, and the dimensions of the resin spheres can be adjusted within a wide range. The meta-aminophenol-formaldehyde resin spheres are calcined to obtain the corresponding carbon spheres, and the carbon spheres also have high monodispersity, thereby being beneficial to the application of the carbon spheres.

The invention relates to a modified cured rubber compound which comprises (i) the rubber components of natural rubber or synthetic rubber, (ii) methano donator, (iii) aralkyl resorcin-aldehyde resin as the methano acceptor, which is modified by m-aminophenol. The inventive methano acceptor has lower smoke degree than R-80 and higher vulcanizing speed than Penacolite B-20-S. The tension and tearing tests prove that the rubber added with the aralkyl resorcin-aldehyde resin modified by m-aminophenol has better performance than R-80 and B-20-S.

The invention discloses a method for preparing a flexible substrate-based sensitive membrane material of a sensor for detecting gases. The method comprises the following steps of: cleaning a flexible substrate, coating a photoresist on the flexible substrate and then performing photoetching development so as to etch off partial photoresist, thereby forming an electrode pattern; orderly forming a Cr layer and a Au layer on the flexible substrate with the electrode pattern formed thereon, and peeling off the two layers to form a Cr/Au electrode; and then depositing a layer of carbon nano-tube doped poly-m-aminophenol film on the substrate on which the Cr/Au electrode is formed already by methods such as dip-coating, screen printing and the like. According to the flexible substrate-based sensitive membrane material provided by the invention, the doping of the carbon nano-tubes completely takes the place of a concentrated strong acid traditionally doped in poly-m-aminophenol; in addition, the doping of the carbon nano-tubes also improves the sensitivity of the poly-m-aminophenol material to the detection of alcohols and ammonia at the normal temperature, and also realizes operability on the flexible substrate.

This invention relates to very specific oxyalkylene-substituted aminophenol compounds as intermediates for the production of poly(oxyalkylene)-substituted xanthene (or other type) colorants. Such an inventive intermediate compound is produced in a single step by reacting an oxyalkylene oxide having from 3 to 12 carbon atoms (branched or unbranched), glycidol, or a glycidyl directly with aminophenol without the use of a catalyst and at a relatively low temperature. Propylene oxide and m-aminophenol are the preferred reactants. The propylene oxide selectively reacts with the amine group on the m-aminophenol without propoxylating the phenolic hydroxyl group. Such a specific method thus does not require extra time- and cost-consuming steps of protecting the phenolic hydroxyl group from attack. After production, this intermediate may be reacted with suitable compounds to ultimately form any number of different colorants, including xanthenes, oxazines, coumarins, and the like. The resultant oxypropylene groups may subsequently be reacted with electrophile compounds to produce any number of different colorants. Resultant colorants produced through the reaction of the inventive intermediate are also contemplated within this invention.

The present invention is aniline-m-aminophenol copolymer as one kind of conductive polymer and its synthesis. Inside an electrolytic bath with Pt electrode or C electrode, aniline, m-aminophenol and sulfuric acid or hydrochloric acid are electrolyzed to obtain the conductive polymer, aniline-m-aminophenol copolymer, which is washed with dilute hydrochloric acid solution and dried. The conductive polymer has excellent characteristic similar to that of polyaniline, and capacity of maintaining high chemical activity in strong acid solution and pH 1.0-11.0 sodium sulfate solution. When the pH value of the copolymer raises from 5.0 to 11.0, it has chemical activity lowered to 58.3 %. The copolymer has wide application potential range,(-0.2 to 0.80 Vú¼vs.SCE), conductivity of 0.8-1.4S/cm, and lower dependence on pH value.

The invention relates to a plugging agent for oil field production, particularly a low-temperature deep gel profile-modification plugging agent and a preparation method thereof. The profile-modification plugging agent is prepared from the following components in percentage by weight: 0.08-0.2% of high polymer coagulant, 0.18-0.25% of dicyandiamide modified urea formaldehyde resin delayed crosslinker, 0.05-0.20% of industrial soda ash, 0.01-0.02% of meta-aminophenol and the balance of water. The invention performs the certain functions of mechanical plugging, endurable movable plugging, dynamic water diversion, pressure wave oscillation and oil washing and carrying, and satisfies the demands for low-temperature oil reservoir high-dose deep profile-modification water plugging and displacement in the oil field.

The invention belongs to the field of chemical engineering, and particularly relates to a preparation method of resorcinol, which comprises: (1) carrying out a diazotization reaction on m-aminophenoland a sodium nitrite solution in a dilute solution of concentrated sulfuric acid to generate m-aminophenol diazonium salt, with the diazotization reaction temperature being 0 DEG C or below; (2) carrying out a hydrolysis reaction on the m-aminophenol diazonium salt in the presence of an organic solvent and water to obtain a resorcinol crude product, with the volume ratio of the water to the organic solvent being (0.5-1.5):(4-6); (3) carrying out post-treatment on the resorcinol crude product to obtain a product resorcinol, wherein the post-treatment step sequentially comprises: (i) an extraction stage; (ii) a vacuum distillation stage; (iii) a pickling stage; and (iv) refining, washing and drying stages. By using the method disclosed by the invention, the resorcinol yield can be greatly improved.

The invention provides an autocatalysis preparation method of a copolymer benzoxazine-resin polymer sphere and belongs to the technical field of polymers. According to the method, on the condition that no catalyst is added, m-aminophenol and formaldehyde are dissolved in a solvent, and after a polymerization reaction, the copolymer benzoxazine-resin polymer sphere is obtained; the solvent is a mixed solution of water and alcohol compounds. The invention further provides a preparation method of a copolymer benzoxazine-resin-based carbon sphere; the method comprises the step that the obtained copolymer benzoxazine-resin polymer sphere is sintered to obtain the corresponding carbon sphere. The obtained copolymer benzoxazine-resin polymer sphere and carbon sphere have the high monodispersity, the size of the resin sphere can be adjusted in a wide range, and the application of the resin sphere is facilitated. The copolymer benzoxazine-resin polymer sphere prepared through the method has the high concentration in a unit reaction system.

The invention provides a method for preparing m-aminophenol by the catalytic hydrolysis of m-phenylenediamine, which comprises the following steps: under the condition of the existence of inorganic acid catalysts, m-phenylenediamine is hydrolyzed at the temperature of 180 DEG C to 230 DEG C and the pressure of 0.9 to 3.0 MPa for 2 to 10 hours; a solvent is adopted to extract hydrolysis products to respectively obtain m-dihydroxybenzene extraction liquid, m-phenylenediamine extraction liquid and m-aminophenol extraction liquid according to different pH values, and then the m-phenylenediamine extraction liquid is processed to be used as raw material for hydrolysis next time; the m-aminophenol extraction liquid is processed by vacuum distillation after being processed by exsolution, and then active carbon is decolourized and recrystallized to obtain m-aminophenol whose purity is more than 99 percent; and the m-dihydroxybenzene extraction liquid is processed by vacuum distillation after being processed by exsolution to obtain the m-dihydroxybenzene whose purity is 99 percent. The method for preparing m-aminophenol by catalytic hydrolysis of m-phenylenediamine is adopted, and proper technological conditions are controlled in the reaction process. The method has the advantages of low cost of raw material and high product yield.

The object of the present patent application are agents for the oxidative coloring of keratin fibers, particularly hair, based on a developer substance-coupler substance combination, characterized in that they contain at least one meta-aminophenol derivative of general formula (I)

wherein

• R1 denotes hydrogen, a C1-C6 alkyl group, a C2-C4 hydroxyalkyl group, a C2-C4 dihydroxyalkyl group, a C1-C4 alkoxy group or a halogen atom; and R2 denotes hydrogen, a hydroxy group, a carboxylic group, an aminocarbonyl group or a hydroxymethyl group.

The invention relates to the technical field of production of m-phenylenediamine and in particular relates to a preparation method of a supported solid acid catalyst for hydrolysis of m-phenylenediamine. The preparation method of the supported solid acid catalyst for hydrolysis of m-phenylenediamine is characterized by comprising the following steps: heating, refluxing and washing activated carbon powder by adopting an acid solution, and washing with deionized water until the pH value is invariable; adding a pretreatment agent for heating and refluxing, washing the treated activated carbon powder with deionized water until the pH value is invariable, and performing vacuum drying for later use; adding heteropolyacid impregnation liquid into the activated carbon powder, filtering the carbon powder subjected to complete impregnation, performing reduced pressure drying, and curing at a high temperature, thereby obtaining the product. The method disclosed by the invention is simple in steps, the prepared catalyst is easily controllable in active ingredient capacity, high in catalytic activity, high in stability and long in service life; and the product is applied to a reaction for preparing resorcinol and m-aminophenol through hydrolysis of m-phenylenediamine, high conversion ratio and yield can be obtained, and polymerized coke and other side reactions can be effectively controlled.

The invention relates to a method for a preparing porous titanium dioxide ball. The method comprises the following steps that 1), a titanium dioxide precursor is added into dispersion liquid of an m-aminophenol formaldehyde resin ball, after the mixture is stirred for several hours, centrifugal separation is conducted, and a compound of the m-aminophenol formaldehyde resin ball and the titanium dioxide precursor is obtained; 2), the obtained compound of the m-aminophenol formaldehyde resin ball and the titanium dioxide precursor in the step one is placed in an oven for standing for some time,and thermal treatment is conducted; 3) after thermal treatment, the compound of the m-aminophenol formaldehyde resin ball and the titanium dioxide precursor is placed in a nitrogen atmosphere for hightemperature carbonization and further roasted to remove carbon, and the porous titanium dioxide ball is obtained; compared with the prior art, the preparation method is simple and mild, the size of titanium dioxide holes can be adjusted by adjusting the concentration of the titanium dioxide precursor, the cost is low, the period is shorter, and the yield is higher.

The invention relates to a preparation method of N-alkyl m-aminophenol, which comprises the following steps: placing m-aminophenol and halogenated hydrocarbon in a reaction vessel containing a solvent, adding stannic chloride as a selective catalyst, then stirring while heating, starting reflux when the temperature reaches 30-90 DEG C, then adding an alkaliferous aqueous solution step by step, continuing to react for 1-10 hours to obtain a reaction liquid after the alkaliferous aqueous solution is added, then adding toluene into the reaction liquid, carrying out still standing, sedimentation and then extraction delamination to separate out an upper organic substance and a lower organic substance, filtering or rectifying the upper organic substance separated out through extraction delamination to obtain the high purity N-alkyl m-aminophenol. The reaction using water or corresponding alcohol as the solvent and stannic chloride as the catalyst has high selectivity, the product purity canreach more than 98 percent without refined purification, and the yield is high, the purification process in a traditional production method is saved, and the production cost is lowered.

The invention provides a process for preparing 3-benzyloxy-4-butylaniline hydrochlorides, which comprises using m-aminophenol as raw material, carrying out butanoylation reaction and Fries rearrangement, obtaining 2-butyryl-5-butyramidophenol, under the action of alkali, reacting 2-butyryl-5-butyramidophenol with benzyl halides, obtaining 2-butyryl-5-butyramidophenyl benzyl ether, hydrolyzing to obtain 3-benzyloxy-4-butyryl benzeneamine, finally carrying out Huangminglong reduction reaction to obtain 3-benzyloxy-4-butylaniline hydrochlorides.

The invention discloses an asymmetric near-infrared squaraine dye, a preparation method thereof and an application thereof. According to the invention, an m-aminophenol derivative and the squaric acid are mixed to dissolve in an appropriate solvent, and then are subjected to the backflow water-diversion treatment in the nitrogen protection environment. After that, the resultant obtained reaction mixture is cooled to be at the room temperature and subjected to the decompression treatment to remove the solvent. The resultant crude product is purified through the silica gel column chromatography process to prepare the asymmetric near-infrared squaraine dye. According to the technical scheme of the invention, through introducing an oxygen-ether chain, the dissolvability of the squaraine dye in an aqueous solution can be effectively improved. The obtained asymmetric near-infrared squaraine dye is good in stability and excellent in optical performance, which can be used as a protein biomarker for dual responses of fluorescence reaction and colorimetric reaction. The asymmetric near-infrared squaraine dye can be applied in multiple fields of biological molecule marking, analyzing, separating, and the like.

A first agent for oxidative hair dye of the present disclosure includes: an (A) component, which is at least one selected from the group consisting of resorcin, derivatives thereof, and salts thereof, in a content not exceeding 0.15% by mass; a (B) component, which is a coupler such as m-aminophenol, a (C) component, which is a dye intermediate such as p-phenylenediamine in a content between 0.01% by mass and 0.45% by mass; and a (D) component, which is an alkanolamine.

The invention discloses a synthesizing method of a disperse yellow dye. The synthesizing method includes the following steps that 1, metha amino phenon and sodium nitrite are subjected to a diazo-reaction under the acidic condition, and metha amino phenon diazonium salt is obtained; 2, the metha amino phenon diazonium salt obtained in step 1 and a methyl ketone pyridine solution are subjected to a coupling reaction, and a coupling product is obtained; 3, the coupling product obtained in step 2 and benzene sulfonyl chloride are subjected to an esterification reaction, and after the reaction is completed, the disperse yellow dye is obtained through posttreatment. The synthesizing method is easy and convenient to operate, short in process and less in sewage quantity, and the performance is consistent with that of filter cake synthesized through a traditional synthesis method.

The invention discloses a synthesis method of 3-(3-hydroxyphenyl)-1, 1-dimethylurea, an intermediate and application. The synthesis method comprises the steps of: generating 3-trimethylsiloxy phenylamine from m-aminophenol as a raw material under the catalysis of HDMS and phosphotungstic acid, then reacting with dimethylamino formyl chloride to obtain 1, 1,-dimethyl-3-(3-trimethylsiloxy phenyl) urea, and then removing TMS to obtain 3-(3-hydroxyphenyl)-1, 1-dimethylurea. The method has the advantages of simple synthesis route, simplicity in operation, high yield and no pollution.

A method for continuously producing m-aminophenol is implemented to produce the m-aminophenol through alkali fusion continuous reaction and specifically includes the production steps of preparing materials, wherein a sodium m-sulfamate solution and a strong base are sequentially added into a material preparing tank according to a certain ratio, and stirring and heating are conducted; conducting heating reaction, wherein the materials in the material preparing tank are continuously discharged into a heating spiral pipeline reactor, and heating reaction is conducted for a certain period of time; conducting heat preserving, wherein the materials are pushed into the heating spiral pipeline reactor through the heating spiral pipeline reactor, and heat preserving is conducted at 280-310 DEG C for a certain period of time; conducting diluting, wherein qualifiedly-diluted materials at the bottom of an impregnation and dilution tank are transferred to the subsequent process section for subsequent processing to obtain a crude m-aminophenol product. Continuous feeding, heating, heat preserving and continuous discharging are realized, the continuity of alkali fusion and the precision of temperature control in the production process of the m-aminophenol are realized, the operation intensity of alkali fusion is relieved, the requirement for the operation level of workers is lowered, and production efficiency is improved.