295 results about "Benzenediol" patented technology

A polyol pre-mix composition includes a blowing agent having a halogenated hydroolefin, a polyol, a catalyst composition, and an antioxidant. The antioxidant may be, for example, a benzene diol or a benzene triol or other polyhydroxy-substituted aromatic compound, which is optionally substituted with one or more substituents such as alkyl groups. A two-part system for producing a thermosetting foam blend includes (a) a polyisocyanate and, optionally, one or more isocyanate compatible raw materials; and (b) the polyol pre-mix composition. A method for producing a thermosetting foam blend includes combining: (a) a polyisocyanate; and (b) the polyol pre-mix composition.

The invention belongs to the technical field of preparation of bulk silicon carbide mesoporous materials, and relates to a bulk silicon carbide aerogel material and a preparation method thereof. The silicon carbide aerogel is a celadon bulk material, the pore size distribution is 10-100 nm, the BET (Brunauer, Emmett and Teller) specific surface area is 130-330 m2/g, and the apparent density is 0.200-0.300 g/cm3. The preparation method comprises the following steps of: preparing RF-SiO2 composite aerogel from benzenediol, formaldehyde, a silicon source, water and alcohol by using the one-pot method through sol-gel, aging and ambient pressure drying, carrying out a carbothermic reduction reaction on the RF-SiO2 composite aerogel under the protection of argon, and calcining the reaction product in the air to obtain the bulk silicon carbide aerogel material. The bulk silicon carbide mesoporous material has the advantages of simple and cheap raw materials, and the method has simple and direct process, is easy to control and is easy to realize mass production and the like.

The invention discloses a method for preparing a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite modified electrode. The method comprises the following steps of: uniformly mixing PEDOT:PSS aqueous dispersion liquid and Nafion, which are taken as raw materials, and then directly dispensing a mixture on the surface of a composite modified electrode; and in the conventional three-electrode system, performing secondary electrochemical doping by using hydrophobic ionic liquid, and thus obtaining the PEDOT:PSS composite modified electrode which is high in water resistance and high in conductivity. The PEDOT:PSS composite modified electrode which is prepared by the method fully combines the film-forming property of the PEDOT:PSS aqueous dispersion liquid, the adhesion characteristic, biological compatibility and anti-interference characteristic of the Nafion, high conductivity and hydrophobicity of the ionic liquid and the electrochemical catalysis characteristic of a nanometer material, can be applied to electrochemical biosensors or electrochemical sensors, is directly applicable to electrochemical detection of auxin, roxithromycin, vitamin C, benzenediol isomer, organophosphorus, glucose, hydrogen peroxide and the like, and has the characteristics of good detection effect, short response time, high water resistance, wide linear range, high sensitivity, high anti-interference, high stability and the like.

Cannabidiol (CBD) is a cannabinoid designated chemically as 2-[(1R,6R)-3-Methyl-6-(1-methylethenyl)-2-cyclohexen-1-yl]-5-pentyl-1,3-benzenediol. Its empirical formula is C₂₁H₃₀O₂ and its molecular weight is 314.46. CBD is a cannabinoid that naturally occurs in the Cannabis sativa L. plant. CBD is a white to pale yellow crystalline solid which is insoluble in water and soluble in organic solvents. The present invention encompasses the surprising recognition that certain CBD preparations which are prepared from a botanical origin are more effective in treating diseases or disorders than preparations of CBD which are synthetic or purified to the extent no other impurities in the form of other cannabinoids are present. Prior CBD compositions have been prepared such that no psychoactive components, e.g., tetrahydrocannabinol (THC), remain in the final CBD preparation. Surprisingly, the absence of such minor impurities reduces the efficacy of CBD treatment. Such CBD preparations are characterized by chemical components and/or funtional properties that distinguish them from prior CBD compositions. One or more components of the preparations described herein provide an unexpectedly synergistic effect when utilized in combination.

The invention discloses a polishing solution as well as a preparation method and application of the polishing solution, wherein the polishing solution comprises a corrosive agent, a viscosity regulator, a corrosion inhibitor, a brightening agent and deionized water. The corrosive agent comprises sulfuric acid and phosphoric acid; the viscosity regulator is one or more selected from the following substances: polyethylene glycol, gelatin, polyhydric alcohol, glycerol and dextrin; the corrosion inhibitor is one or more selected from the following substances: rodine, thiourea, diamylamine, methylphenylthiourea and ethylenediamine tetraacetic acid; the brightening agent is one or more selected from the following substances: salicylic acid, sulfonic acid, sodium benzoate, benzenediol and fluorine-contained quaternary ammonium. The polishing solution disclosed by the invention is free of heavy metal components, easy to realize subsequent treatment, relatively good in polishing stability and capable of obtaining a relatively good polishing effect within a relatively wide concentration change range. In addition, the preparation method of the polishing solution disclosed by the invention is low in process condition requirement and capable of obtaining the relatively good polishing effect within a wide current density range.

The invention relates to a catalyst of preparing benzenediol in a phenol hydroxylation and a preparation technology thereof. The catalyst contains Fe2O3, ferro compound and zero valent ferri. The catalyst can transform phenol into the pyrocatechol and the hydroquinone in water containing oxyful in 0.5h (comprising about 25min of induction period) under the condition that the proportion of H2O2 to phenol is 1:1 and the temperature is 60 DEG C with the result that the transformation ratio of the phenol can reach 28 percent, the yield of the benzenediol reaches 25.5 percent, and the proportion of the pyrocatechol to the hydroquinone is about 1.3. When the proportion of H2O2 to phenol is 1.5:1, the transformation ratio of the phenol can reach 44 percent, and the yield of the benzenediol reaches 38.8 percent. The catalyst has low cost, simple preparation and stable performance. The catalyst is remarkably characterized by achieving the transformation ratio of the phenol from 0 to 28 percent within less than 2min of reaction, having higher activity and effectively reducing the side reaction.

The invention discloses a process for synthesizing benzoquinone substances by direct oxidation of phenol substances. The synthesis process comprises the following steps of: dissolving the phenol substances serving as raw materials in a liquid solvent, and directly oxidizing the phenol substances into the corresponding benzoquinone substances by using oxygen-containing gas under the catalysis of a solid catalyst and/or a catalyst capable of being dissolved in a liquid medium. The process is characterized in that: because a reaction tower provided with an atomizing nozzle and/or a bulk copper wire filler is adopted, the liquid and the gas are fully contacted and uniformly mixed in the reaction tower, the gas and the liquid have as large inter-phase boundary as possible, the comprehensive rate of reaction is improved, side reaction is reduced, and the selectivity of the benzoquinone substances serving as target products is improved; and the whole process can be continuously operated, and can also be intermittently operated. The generated benzoquinone substances can be further reduced into benzenediols (catechol and/or hydroquinone) by using traditional reduction methods.

The invention relates to a novel general formula compound that is 2-tert-butyl para-methane meta-benzenediol polysulfide (B-450 vulcanized rubber regeneration activator). The invention also relates to the preparation of the compound and the application of the compound of the invention in waste rubber generation activation.

A modified titanium silicate molecular sieve material is obtained by means of modification of a titanium silicate con molecular sieve from magnesium and aluminum. The mass ratio of the magnesium, by MgO, to the titanium silicate molecular sieve is x, and x ranges from 0.001 to 0.99, the mass ratio of the aluminum, by Al203, to the titanium silicate molecular sieve is y, and y ranges from 0.001 to0.99. An acid-base effect of the material and an oxidation effect of the titanium silicate molecular sieve are realized cooperatively, better catalytic selectivity is realized, for example, the selectivity on benzenediol in reaction production of phenol hydroxylation is higher than that relative to catechol, and accordingly added values of the product can be greatly increased.

A filtration membrane is coated with a polymer made from a compound comprising a benzenediol or a substituted phenol, such as catechol. The polymer deposition process comprises exposing the membrane to the compound in an aqueous alkaline solution. A membrane module may be immersed in the solution. Optionally, the solution is aerated. The polymer coating is reasonably durable in aqueous environments but may be removable. In an example, a module of PVDF based outside-in hollow fiber membranes was coated with poly(catechol). The membranes had a reduced fouling rate and could be maintenance cleaned with water or a dilute oxidant solution. The polycatechol coating could be oxidized by cleaning the membrane with a hypochlorite solution and re-coated. The modified membranes may be used, for example, in water or wastewater treatment. A filtration process includes steps of oxidizing and re-applying the coating after the membrane has been in use.

The invention discloses novel environmentally friendly phosphorus based flame retardant 2-(diphenylphosphine acyl)-1,4-benzenediol and a preparation method thereof. The flame retardant is reasonable in raw material price, less in additive amount and environmentally friendly and simple in preparation technology, and facilitates industrial production. A halogen-free flame retardant monocomponent epoxy resin composite containing the novel environmentally friendly phosphorus based flame retardant can be stored under room temperature, and is superior in flame retardant property after solidification; when the phosphorus content achieves 1.8%, the solidification flame retardant rating can achieve UL94 V-0; however, the DOPO flame retardant can achieve the same effect only when the phosphorus content thereof achieves 2.1%. The additive amount of the flame retardant is low, the cost is low, and the good mechanical property of the halogen-free flame retardant epoxy resin cured substance can be retained better.

The invention relates to a catalyst for oxidizing phenol by hydrogen peroxide at room temperature to prepare benzenediol, and the preparation method of the benzenediol. The structural formula of the catalyst is AmBnFexSiOy, wherein A is one of the elements of the III main group in the periodic table, and B is one of the transition metal elements. A certain amount of inorganic metallic ferric salt and a precursor containing A and/or B are dissolved in a water solution, the solution is added to a water solution containing a surface active agent and a silicon source; after the solution is stirred, water solution of tetramethyl ammonium hydroxide is added, and then, sol is obtained by regulating the pH value; and the sol is centrifugated, washed and dried after being aged at room temperature or under the hydrothermal condition, and then, the surface active agent is removed to obtain the catalyst. The invention also relates to the preparation method of the benzenediol, which is characterized in that the catalyst is adopted, and the phenol is directly oxidized by the hydrogen peroxide at room temperature to prepare the benzenediol. The invention overcomes the disadvantages of high energy consumption, heavy machine utilization and the like under the conditions of high temperature and high pressure in the prior art of synthesizing benzenediol.

The invention relates to a preparation method of porous carbon microspheres and belongs to the field of nano material synthesis. The preparation method of the porous carbon microspheres mainly comprises the steps of uniformly mixing m-benzenediol and formaldehyde, then adding deionized water and stirring to form a uniform carbon source precursor solution; adding polymeric microspheres which are of a hollow structure into the carbon source precursor solution obtained in the step one, thus obtaining a phenolic resin-polymer core-shell structure; adding acetic acid to the phenolic resin-polymer core-shell structure product and heating for curing at the temperature of 40-80 DEG C, thus obtaining cured phenolic resin-polymer core-shell structure microspheres; removing polymers out of the cured phenolic resin-polymer core-shell structure microspheres by using an organic solvent like tetrahydrofuran, thus obtaining resin microspheres; drying the core-shell structure microspheres at the temperature of 60-80 DEG C and carbonizing in a high temperature furnace, thus obtaining the porous carbon microspheres are obtained. The preparation method of the porous carbon microspheres has the advantages that the adopted raw materials are common chemical raw materials, and cost is low; a technology is simple; large-scale industrial production is facilitated.

The invention discloses a CuO-loaded SiO2 catalyst applied to preparation of benzenediol and benzoquinone and a preparation method of the catalyst and relates to the technical field of production of chemical raw materials and intermediates. The preparation method of the catalyst comprises the following steps: adding copper acetylacetonate into a sublimator of a chemical vapor deposition device by a chemical vapor deposition method, adding SiO2 into a fluidized bed reactor, introducing carrier gas N2, fluidizing SiO2 under the vacuum pumping condition, reacting and ending, drying SiO2, introducing air into the sublimator, heating the sublimator and sublimating the copper acetylacetonate, regulating the temperature of the fluidized bed reactor, depositing the copper acetylacetonate on SiO2 and simultaneously decomposing and oxidizing copper acetylacetonate into CuO. The catalyst prepared by the method has the characteristics of large specific surface, small nano CuO particles and uniform load of CuO on a carrier SiO2; the high dispersion of CuO on SiO2 has an important influence for preparing benzenediol and benzoquinone by virtue of oxidization of phenol.

The invention provides a low-cost high-performance rubber composite material and a preparation method thereof. The process is simple, low in production cost and suitable for industrial production. The composite material is prepared from the following raw materials in parts by weight: 60 to 70 parts of fluorine rubber, 30 to 40 parts of styrene-butadiene rubber, 10 to 15 parts of acrylonitrile-butadiene rubber, 3 to 5 parts of magnesium hydroxide, 1 to 2 parts of microcrystalline wax, 3 to 5 parts of polyester oligomer, 2 to 3 parts of benzenediol, 1 to 2 parts of titanium pigment, 1 to 2 parts of accelerant N-cyclohexyl-2-benzothiazole sulfenamide C13H16N2S2, and 1 to 2 parts of age inhibitor N-phenyl-N'-based p-phenylenediamine. The abrasive rubber composite material provided by the invention has excellent wear-resisting property and is lighter than metal in weight. Therefore, the high-performance abrasive rubber provided by the invention can be widely used in workplaces with requirements on the wear-resisting property and high and low temperature resistance to greatly prolong the service life of a workpiece or equipment and the like.

The invention discloses a method for simultaneously detecting three isomers of benzenediol on basis of a sensor of a thionine functionalized carbon nanotube. The method comprises the following steps of: carrying out chemical reaction on a carboxylated multiwalled carbon nanotube and thionine with amino to form an amidated carbon nanotube, and modifying the amidated carbon nanotube on a glassy carbon electrode to form a modification layer so as to simultaneously detecting the three isomers of the benzenediol. Researches show that by modifying the electrode through the multiwalled carbon nanotube/thionine, the electrochemical response of the isomers of the benzenediol is greatly increased, and a feasible method is provided for simultaneously detecting the three isomers of the benzenediol.

The invention relates to a synthetic method of etamsylate. The synthetic method comprises the following steps of (1) preparation of 2,5-dihydroxybenzenesulfonic acid; (2) preparation of a etamsylate crude product; and (3) purification. Compared with a conventional synthetic process of the etamsylate adopting concentrated sulfuric acid as a sulfonating agent, the synthetic method has the following advantages that the synthetic method employs chlorosulfonic acid as the sulfonating agent, and performs azeotropic dehydration on benzenediol and an organic solvent until anhydrous before sulfonation to ensure that no water is in the reaction system, thereby increasing product yield; hydrogen chloride gas produced during the sulfonation process can be absorbed by water to make hydrochloric acid, thereby decreasing discharge of three wastes (waste gas, waste water and waste residues); and usage amount of the sulfonating agent is decreased during the sulfonation process, so that production cost is reduced.

The invention relates to a method for preparing benzenediol by catalyzing phenol to hydroxylation with a liquid phase transition metal coordination compound salt. The method comprises the steps of mixing phenol, solvent and catalyst uniformly, and at the pressure of 1-5 atm, increasing the temperature to 50-90 DEG C; and sectionally dropping hydrogen peroxide in the reaction solution in stages, and stirring the solution for reaction for 0.3-5 h, thus obtaining the benzenediol. The preparation method is low in cost, applicable to medium-low concentration hydrogen peroxide solution and good in selectivity, and the phenol hydroxylation and catalyzing method has high selectivity to benzenediol.

The invention provides a high weather-resistant spray-free metal-imitating ABS composite material. The ABS composite material comprises, by weight, 80 to 95 parts of ABS, 5 to 20 parts of modified ABS, 1 to 10 parts of spray-free metal-imitating master batches, 0 5 to 2 parts of a silicane coupling agent, 1 to 5 parts of a crosslinking aid, 0.5 to 2 parts of a dispersant and 1 to 5 parts of a toughening agent. The modified ABS is a copolymer of ABS, 4-[2-(3, 5-dihydroxyphenyl)vinyl]-1, 2-benzenediol and diacrolein pentaerythritol. The spray-free metal-imitating master batches are modified ABS-coated pearlescent metallic pigments.

The invention discloses a preparation method of conductive adhesive hydrogel. The preparation method comprises the following steps of: grafting dopamine to carboxyl-containing oxidized polysaccharidethrough amidation reaction; and adding catechol group-containing oxidized polysaccharide and iron ions into collagen (or gelatin) and a polyacrylamide system, so as to make benzenediol groups and ironions form a redox pair, so as to initiate free radical polymerization of acrylamide and crosslinking of collagen (or gelatin) to form the double-network hydrogel with electric conduction and adhesionfunctions. The hydrogel has the advantages of good porosity, swelling rate, electrical conductivity, adhesion performance and good biocompatibility. The method can be used for preparing the conductive hydrogel in the fields of biomedicine, electronic skin, human-computer interface, human body activity monitoring, wearable electronic equipment and the like.

The invention relates to a cream and a preparation method thereof. The cream is prepared from the following raw materials in parts by mass: 4 to 32.5 parts of emollient, 2 to 5 parts of butyl methoxyl dibenzoylmethane, 0.5 to 1 part of 4-[3-(2,4-dimethoxy-3-methylphenyl)propyl]-1,3-benzenediol, 0.005 to 0.01 part of glabridin, 0.3 to 0.7 part of hydroxydecyl ubiquinone, 0.05 to 0.25 part of sodium hyaluronate, 1 to 5 parts of bio-saccharide gum-1, 1 to 5 parts of beta-glucan, 0.5 to 1 part of nicotinamide, 0.5 to 1.5 parts of 3-O-ethyl ascorbic acid ester, 0.1 to 0.3 part of dipotassium glycyrrhizinate, 2 to 5 parts of peony root extract, 0.2 to 0.5 part of thickener, 1.5 to 6.5 parts of emulsifier, and 3 to 6 parts of butanediol. The cream has the advantages that the irritation to skin is smaller, and the better whitening, speckle removal and moisturizing effects are realized.

The invention provides a synthesis method of pesticide intermediate 2-[4-(hydroxyphenoxy)] propionic acid. Benzenediol and ethyl lactate are used as raw materials, the diether is prevented from generating through monohydroxy protection, and 2-[4-(hydroxyphenoxy)] propionic acid is prepared through hydroxyl deprotection and hydrolysis. The synthesis method has the advantages of mild condition, short reaction time, simple post treatment, high yield and low production cost and has better industrial application prospects.