163 results about "Pyrocatechols" patented technology

The invention provides a high-performance hybrid separation membrane and a preparation method thereof. The interior of a matrix material of the separation membrane, the surface of the separation membrane and the surfaces of membrane pores all contain a poly-o-phenylenediquinone compound produced after oxidation of a pyrocatechol compound and cross-linked, cured and uniformly dispersed nano-materials. The preparation method comprises the following steps: adding a pyrocatechol derivative into a membrane-casting blended solution of the nano-materials and a polymer to promote bonding of the nano-materials and the polymer; and oxidizing the pyrocatechol compound into the poly-o-phenylenediquinone compound in the processes of phase inversion and film formation so as to realize cross-linking and curing of the nano-materials and dispersion of the nano-materials in the polymer matrix. The method comprises the concrete steps of preparation of the membrane-casting solution, blending of a coagulation bath, film formation and curing and/or modification.

The invention discloses a preparation method and an application of an anti-pollution hydrophilic separating membrane. The preparation method is characterized in that a pyrocatechol derivative is used as an accelerant and a curing agent between a separating membrane material and a hydrophilic material, when blending casting film liquid of the separating membrane is prepared, the pyrocatechol derivative is added to blending liquid of the separating membrane material and the hydrophilic material, and the pyrocatechol derivative is subjected to polymerization cross-linking in a phase conversion process of the membrane preparation, so that the effect of fixing the hydrophilic material is achieved. The preparation method of the anti-pollution hydrophilic separating membrane has strong universality and is suitable for the blending of multiple hydrophilic materials and multiple membrane materials. The preparation method is simple, easy to operate, mild in conditions, economic, high-efficiency, environmentally-friendly, easy for industrialization and suitable for the preparation of multi-functional hydrophilic micro-filtration membranes, ultra-filtration membranes, nano-filtration membranes, reverse-osmosis membranes, positive-osmosis membranes, pressure-delay osmosis membranes, pervaporation membranes and the like which are used for liquid and gas separation and membrane reactors.

The invention discloses a method for surface modification of a hydrophobic polymer microporous membrane. The method comprises the steps of dissolving a pyrocatechol compound and a polyamine molecule in a solvent, and adjusting the mixture to be alkaline so as to obtain a modification solution; soaking the hydrophobic polymer microporous membrane in the modification solution to realize the surface modification of the hydrophobic polymer microporous membrane through reaction, wherein the structural formula of the pyrocatechol compound is shown by a formula I, and in the formula I, R is H, -CH3, -(CH2)nCOOH, -CHO or OH and n is an integer between 0 and 2. The microporous membrane modified by the method disclosed by the invention can be applied in the fields of diaphragms of positive and negative materials of lithium secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, polymer batteries and the like, as well as separation membranes including reverse osmose membranes, micro-filtration membranes, nano-filtration membranes, ultrafiltration membranes, electrodialysis membranes, gas separation membranes and the like to improve the performances of materials and devices.

The invention discloses hyperbranched polyurethane having self-repairing function in seawater. The hyperbranched polyurethane is prepared from the following raw materials in parts by weight: 213-311 parts of isocyanate-terminated polyurethane prepolymer, 1-16.7 parts of polyhydroxy-terminated hyperbranched polyester, 0.7-18.6 parts of 2,2-dihydromethyl propionic acid, 1-23.7 parts of dopamine hydrochloride and 0.3-6.7 parts of FeCl3. The invention also provides a preparation method and application of hyperbranched polyurethane. A coordination interaction occurs between hyperbranched polyurethane and a pyrocatechol structure in dopamine by virtue of Fe<3+> so as to improve the mechanical properties of the polymer and endow the polymer with the self-repairing function in seawater; the repairing efficiency reaches up to 87% and the polymer has repeated adhesive property in seawater.

The invention discloses a layer-by-layer electrostatic self-assembling method based on dopamine-modified polyelectrolyte and application. Dopamine and polyelectrolyte with carboxyl are subjected to dark reaction through carbodiimide/N-hydroxysuccinimide (EDS/NHS) so as to generate the polyelectrolyte of which a carboxyl part of a main chain is substituted by a pyrocatechol functional group; two hydroxyl groups on a benzene ring of pyrocatechol form tight combination with the material surface; and the obtained polyelectrolyte is alternatively deposited together with the polyelectrolyte with opposite charges so as to be assembled into a multi-layer film. Compared with other layer-by-layer assembling techniques, the layer-by-layer electrostatic self-assembling method disclosed by the invention has the advantages that being simple in operation, not affected by material and shape of a substrate, free of surface pretreatment, high in binding strength with the substrate and better in popularization and application value.

The invention belongs to the technical field of organisms, and particularly relates to a preparation method of L-tyrosine or L-tyrosine derivative (L-3-hydroxy tyrosine) employing enzyme conversion. The preparation method comprises the steps of: adopting feed liquid containing pyruvic acid as a substrate; adding bacterial cells with tyrosine phenol lyase activity, or crude enzyme, ammonia water, phenol or pyrocatechol; carrying out enzymatic reaction under the conditions that the temperature is 25-55 DEG C and the pH is 7-11; and separately preparing a converted product L-tyrosine or L-dioxyphenylalanine by using an isoelectric point crystallization method. By adopting the method, the L-tyrosine or L-dioxyphenylalanine with high additional value is synthetized by using cheap pyruvic acid liquid as the substrate by an enzymic method; the preparation method has the advantages of being wide in material source, high in enzymatic conversion efficiency, simple and convenient to operate, low in production cost and the like.

The invention discloses a novel method for simultaneous detection of hydroquinone and pyrocatechol by using a nitrogen-doped graphene-modified electrode. The method comprises the following steps: 1) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains hydroquinone and pyrocatechol with a total concentration of 1* 10<-4> mol/L and carrying out cyclic voltammetric scanning of different scanning speeds with a platinum wire electrode used as a counter electrode and a saturated calomel electrode used as a reference electrode; 2) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains pyrocatechol with a concentration of 1* 10<-5> mol/L and hydroquinone with different concentrations and carrying out differential pulse voltammetric scanning with the platinum wire electrode used as the counter electrode and the saturated calomel electrode used as the reference electrode; and 3) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains hydroquinone with a concentration of 1* 10<-5> mol/L and pyrocatechol with different concentrations and carrying out differential pulse voltammetric scanning with the platinum wire electrode used as the counter electrode and the saturated calomel electrode used as the reference electrode.

The invention discloses a Pseudomonas aeruginosa strain TBPY, which is screened from tribromophenol(TBP)-polluted sludge and purified. The purified strain is domesticated by a pressure type domesticating method with gradually increased TBP concentration in an organic salt culture medium, and the domesticated strain can be used for the biological control of waste water containing persistent organic pollutants such as phenol, pyrocatechol, resorcinol, benzoic acid, p-hydroxybenzoic acid, vanillin, 4-chlorophenol, 2,4-dichlorophenol, trichlorophenol and tribromophenol and has high research and application values.

The invention relates to paper and paper filter sticks containing secondary acetate functionalized by amine compounds, and a preparation method thereof, belonging to the preparation technical field of cigarette filter sticks. The weight content of the secondary acetate functionalized by amine compounds in the paper filter stick is 10 to 60 percent, and the rest is one or a plurality of wood pulp fiber or jute pulp fiber. The invention has the advantages that: the cigarette-used paper filter stick containing the secondary acetate functionalized by amine compounds overcomes the defects that the adoption of pure plant fiber paper filter sticks causes the dry feeling of the smoke and the estimation reduction of aesthetic quality, and under the condition of keeping the estimation of the cigarette aesthetic quality to be basically unchanged, the amount of tar can be reduced to 3 to 5mg per unit, and the removing rate of phenol, pyrocatechol, hydroxyphenol, hydroquinone and paracresol reaches the best, which respectively reaches 36.04 percent, 18.03 percent, 36.81 percent, 22.04 percent and 29.83 percent.

The invention relates to a polyaniline (PAn) modified ordered mesoporous carbon (EOMC) immobilized laccase biosensor and a preparation method. The biosensor is characterized in that enzyme, EOMC+Lac and an EOMC+Lac/PAn modified gold electrode can be better immobilized by covering the periphery of mesoporous carbon with a layer of PAn film. The biosensor and the preparation method have the following beneficial effects: the gold electrode modified by the PAn modified EOMC immobilized laccase can show good direct electrochemical behavior; under the experimental conditions that the room temperature is 25+/-2 DEG C, the pH value of phosphate buffered solution is 5.0 and the working voltage is +0.45V vs SCE, compared with the EOMC+Lac/Au electrode which is not modified by PAn, the EOMC/PAn+Lac/Au electrode shows better sensing property; the linear detection range of p-pyrocatechol of the EOMC/PAn+Lac/Au electrode is 0.55-10.45mu M, the selective sensitivity of the EOMC/PAn+Lac/Au electrode is 0.08314A/M (n=19), the apparent Michaelis constant of the EOMC/PAn+Lac/Au electrode is 11.5327mu M and the detection limit of the EOMC/PAn+Lac/Au electrode is 0.173mu M (S/N=3); and besides, the laccase biosensor also shows good repeatability and stability; therefore, the PAn modified mesoporous carbon is expected to become a composite for immobilizing laccase and a new thinking is provided for modifying the immobilized enzyme by the mesoporous carbon.

The invention discloses a synthetic process of berberine. The synthetic process comprises the following synthetic route: pyrocatechol and dichloromethane are taken as raw materials and dimethyl sulphoxide is taken as a solvent to synthesize 1,3-benzodioxole; 1,3-benzodioxole is subjected to ViLsmeiar formylation to synthesize heliotropin; heliotropin undergoes nitration through a Henry reaction to generate beta-nitro-3,4-dioxomethenyl styrene; beta-nitro-3,4-dioxomethenyl styrene is subjected to Clemmensen reduction to generate 3,4-(methylenedioxyphenyl)ethylamine; and 3,4-(methylenedioxyphenyl)ethylamine and 2,3-dimethoxy benzaldehyde condense, and the obtained product is reduced to generate N-2,3-dimethoxybenzyl [3,4-(methylenedioxy)phenyl]ethylamine hydrochloride. N-2,3-dimethoxybenzyl [3,4-(methylenedioxy)phenyl]ethylamine hydrochloride is cyclized in a condition of glyoxal, formic acid and copper sulphate to generate berberine hydrochloride. According to the synthetic route, cyanation is avoided and toxicity is reduced. Zinc amalgam is adopted to replace H2Ni and LiAlH4, so that the cost is greatly reduced, the process difficulty is reduced, and the product yield is increased.

The invention discloses a laccase biosensor based on magnetic carbon nano tube and chitosan/silicon dioxide gel, comprising a magnetic carbon paste electrode, the electrode surface of the magnetic carbon past electrode is modified with a magnetic carbon nano tube layer, the surface of the magnetic carbon nano tube layer is absorbed with laccase, the laccase is wrapped by a chitosan-carbon dioxide composite film; the preparation method of the laccase biosensor includes the steps of material preparation, magnetic carbon nano tube modification, laccase absorption and laccase wrapping. The method for detecting pyrocatechol by applying the laccase biosensor includes the following steps: the laccase biosensor is taken as a working electrode, a three electrode system is established, the three electrode system is connected with an electrochemical work station, and reduction current amount is detected to quantitatively indicate the concentration of pyrocatechol in solution to be detected. The sensor of the invention has the advantages of low cost, simple manufacturing, long service life, high laccase activity, high detection accuracy and strong anti-interference.

The invention relates to a technique for preparing a polymerization inhibitor product. The polymerization inhibitor product is a mixed solution consisting of para-tertiary butyl pyrocatechol and aliphatic hydrocarbon solvent. The synthesis technique for the para-tertiary butyl pyrocatechol comprises the following steps: using pyrocatechol and isobutene as raw materials, using LCS-7 or LANK-98 or FS-1 solid acid as a catalyst for alkylation reaction, and carrying out catalytic alkylation reaction in a closed reaction kettle; and after the reaction is finished, filtering and rectifying the catalyst in the alkylation solution to separate out pyrocatechol as the raw material and by-product to obtain the para-tertiary butyl pyrocatechol. The para-tertiary butyl pyrocatechol is dissolved in the aliphatic hydrocarbon solvent, to prepare even mixed solution, so as to obtain the polymerization inhibitor product. The technique has the characteristics of simple production process, high product yield, low production cost, good quality and basically no environmental pollution, and is convenient for industrialized production.

The invention discloses a method for synthesizing watermelon ketone. Under the protection of nitrogen, inorganic or organic base, PEG-400, potassium iodide, methanol, and 4-methyl pyrocatechol are added into a reactor and are heated to be between 65 and 70 DEG C, then 1,3-dichloroacetone is dripped into the mixture, and the mixture is subjected to reflux reaction under thermal insulation for 5 to 6 hours after the dripping is finished; a crude product is obtained through cooling and suction filtration, and the methanol is recovered; ethyl acetate is added into the crude product, a saturated saline solution is used to scrub to be neutral, and the ethyl acetate is recovered; and the reduced pressure distillation is performed, and a distillate is recrystallized by a mixed solvent of the methanol and n-hexane to obtain a white crystalline solid, namely the watermelon ketone, wherein the mass ratio of the 4-methyl pyrocatechol to the 1,3-dichloroacetone is 1 to 1, the mass ratio of the inorganic or organic base to the 4-methyl pyrocatechol is between 1 to 0.7 and 0.75, the mass ratio of the potassium iodide to the 4-methyl pyrocatechol is between 1 to 7.0 and 7.5, the mass ratio of the PEG-400 to the 4-methyl pyrocatechol is between 1 to 20 and 30, and the mass ratio of the methanol to the n-hexane in the mixed solvent is 1 to 2. The method adopts a one-pot method to synthesize a target product, and has the advantages of mild reaction conditions, convenient operation, and high product yield.

The invention provides a multifunctional bionic polymer of the following general structural formula, wherein m represents a positive integer in the range of 5-1000, n represents a positive integer in the range of 0-800, x represents a positive integer in the range of 1-500, and y represents a positive integer in the range of 2-400; R1, R2, R3 and R4 represents H, CH3 or CH3CH2; R5 represents H, an alkanyl group of 1-18 carbon atoms or polyethylene glycol having a degree of polymerization being 1-20000; W represents a hydrophilic group linked by a chain containing 2-20 carbon atoms; M represents folic acid, etc. with a linking arm linked by amide bond; and N represents pyrocatechol, dopamine or dopa group with a linking arm linked by amide bond. The invention further provides a preparation method and application of the multifunctional bionic polymer, and the multifunctional bionic polymer can significantly prolong the in vivo circulation time of a nano drug loading system and improve the targeting appointed conveying function of the nano drug loading system.

The invention discloses a modified electrode for detecting pyrocatechol and hydroquinone. The modified electrode comprises a substrate electrode and phthalic acid ethylene glycol diacrylate-carboxylate multiwalled carbon nanotube-graphene which is attached to the substrate electrode. The invention also discloses a method for preparing the modified electrode. The modified electrode can be used for detecting the pyrocatechol and hydroquinone. The linear range of pyrocatechol detection is 5.0*10<-7>-4.0*10 mol/L, and the detection limit is 1.8*10<-8>mol L-1; the linear range of hydroquinone detection is 5.0*10<-7>-4.0*10<-4> mol/L, and the detection limit is 2.0*10<-8> mol L-1. The modified electrode is simple in preparation method, the preparation conditions are easily controlled and realized, the linear detection range is wide, the detection limit is low, and the detection method is high in stability and high in sensitivity.

The invention discloses a synthesizing method for 1,2-dimethoxy benzene, which utilizes pyrocatechol, strong base and chloromethane as raw materials and water as solvent to react in a high pressure autoclave; wherein the mol ratio of strong base to pyrocatechol is 2-3:1, the mole ratio of chloromethane to pyrocatechol is 2-3:1, the reaction temperature is 50-100 DEG C, the reaction pressure is 0.3-0.5 Mpa, the reaction time is 4-10h, and the 1,2-dimethoxy benzene is obtained through carrying out liquid separating and rectification on reaction liquid. The method of the invention is adopted to synthesize 1,2-dimethoxy benzene, thus having the characteristics of environment friendless, simple process and high yield.

A two-component reaction resin includes a resin component (A), which contains, as curable constituent (a), at least one free radical-curable, ethylenically unsaturated compound, an agent (b) for adjusting the reactivity and the gel time and at least one comonomer (c) and a curing component (B), which is disposed separate therefrom to inhibit any reaction and is a curing agent for the resin of the resin component (A) and which, as agent (b) for adjusting the reactivity and the gel time, contains a pyrocatechol derivative of the general Formula (I):

The invention provides a method for preparing active phenolic compounds through rosin-induced bioconversion. The method comprises the following steps: performing the routine culture of the microbial strain A5<+> in potato dextrose agar (PDA) culture medium to obtain the activated strain, inoculating the activated strain in the PDA culture medium to ferment for 48-72 hours; adding the inducer in the fermented strain to perform bioconversion; filtering and concentrating the conversion fluid to obtain conversion product crude extract; performing gradient alcohol precipitation on the conversion product crude extract, extracting with petroleum ether and ethyl acetate, finally separating and purifying the product through thin layer chromatography, silica gel column chromatography LH-20 gel chromatography and high performance liquid chromatography to obtain O,O-1,1'-di(2-hydroxyl-3,4,5-trimethyl)phenyl oxo bridge and 4,5,6-trimethyl-1,2-pyrocatechol. The bioconversion method has the advantages of high efficiency and selectivity and mild reaction conditions, and can hardly cause environmental pollution; the cost of the method is lower than the extraction method, thus the cost can be saved; and the obtained phenolic compounds have the functions of antioxidant property, antibacterial property, antiviral property, anticancer property, radiation resistance and antiallergic property.

The invention relates to a preparation method of a nanocellulose-based high-efficiency electromagnetic shielding porous material. The preparation method comprises the following steps: performing triple crosslinking on a cellulose nanowire suspension as a raw material with an organosilane coupling agent and dopamine; chelating silver ions by virtue of rich pyrocatechol and amino groups ondopamine and reducing the silver ions into silver seeds; and under the contact of an electroless plating solution and the action of a glucose reducing agent, growing silver particles on the silver seeds, so asto finally form a uniform and strong metallic silver coating on the surface of the porous material. According to the invention, the uniform metallic silver coating is formed on the surface of the polydopamine modified cellulose-based porous material under the action of glucose without destroying the open pore structure thereof, and experiments prove that the porous material is an excellent electromagnetic wave absorbing material which is able to reduce secondary electromagnetic pollution and meet the needs of electromagnetic protection, and thus has great application prospects in special fields.

The invention relates to nitrogen and boron co-doped carbon nano microspheres and a preparation method thereof. The preparation method comprises the following steps of: firstly, performing reactions on a polyamino compound with 3,4-dihydroxyl benzaldehyde and 4-formylphenylboronic acid to synthesize a monomer with a pyrocatechol group and a phenylboronic acid group; then performing a condensation reaction on pyrocatechol and boric acid to prepare borate polymer microspheres containing nitrogen and boron; carbonizing the microspheres by way of high-temperature calcining; and finally, forming the nitrogen and boron co-doped carbon nano microspheres. The method can synergically dope nitrogen and boron in the carbon nano microspheres and has a potential advantage in enhancing the capacitance and electro-catalytic property and the like of the carbon nano material.

The invention discloses a water-borne rust-based anticorrosion coating which comprises the following raw materials by weight portion: 60-70 portions of styrene-acrylic emulsion, 30-40 portions of water-borne acrylic emulsion, 2-4 portions of alcohol ester-12 forming additive, 2-3 portions of vanadium oxytrichloride, 0.5-0.8 portions of benzotriazole, 3-4 portions of glycerine, 2-4 portions of 2- methyl-1,3- propylene glycol, 2-3 portions of hydroquinone, 1-2 portions of pyrocatechol, 2-3 portions of Ethylene Diamine Tetra Methylene Phosphonic Acid Sodium, 3-4 porptions of citric acid, 1-2 portions of modified adhesive, 0.1-0.2 portions of carboxymethyl cellulose and an appropriate amount of deionized water. The coating has good comprehensive performances including base body adhesive power, rot resistance, adhesive power, can completely avoid coating preprocessing processes, including sand blasting and shot-blasting, and can provide lasting and efficient protection for iron steels, the surfaces of which are rusty and not subjected to pre-processing; and accordingly, not only is the service life of an anti-corrosion finishing coat prolonged, but also the anti-corrosion coating process is simpler, and more efficient, economical and environment-friendly.

The present invention relates to a body-type high-strength bionic adhesive preparation method, which comprises: adding polyvinyl alcohol and a solvent to a reaction kettle, adding a catalyst and a pyrocatechol-containing compound under protection of argon or nitrogen, carrying out a stirring reaction for a certain time at a temperature of 50-100 DEG C, cooling the system to a room temperature, precipitating in water, repeatedly washing the precipitate by using water, and carrying out vacuum drying to obtain the bionic adhesive. According to the present invention, the adhesive is synthesized by using the one-step method, such that the operation scale-up and the industrial production are easily achieved; the adhesive is the body-type adhesive, the curing is rapid, and the strength achieves more than or equal to 6 MPa; the adhesive has the wide substrate universality, and is suitable for adhesion of metals, plastics, glasses, ceramics, bones and the like, and is further suitable for preparation of formaldehyde-free wood-based plates; and the perfect combination of the synthetic polymer and the natural mussel adhesion protein is achieved, the technical bottleneck of the current bionic mussel adhesive is expected to be broken through, and the new approach is provided for the development of the bionic polymer materials based on shellfish.

The invention discloses a supported flower-shaped hierarchical-structure nanoscale precious metal material and a preparation method thereof. The method comprises the following steps that firstly, heteropolyacid and dopamine are co-assembled by adopting a chemical self-assembling method so as to obtain the flower-shaped hierarchical structure material assembled by the heteropolyacid and the dopamine; and then the flower-shaped hierarchical structure material is dispersed into a soluble salt aqueous solution of precious metal, pyrocatechol groups of the flower-shaped hierarchical nano-structureis used for reducing precious metal ions in situ so as to prepare the supported flower-shaped hierarchical-structure nanoscale precious metal material. The preparation method has the advantages of being simple and convenient to operate and controllable in height. The prepared supported flower-shaped hierarchical-structure nanoscale precious metal material is a crystal material with a face-centeredcubic structure, is controllable in size and morphology and has a wide application prospect.

The invention discloses a preparing method of deccox, which uses cheap pyrocatechol as material to obtain deccox products with good quality and low cost by diethoxylation, nitration, alkali hydrolysis, decyloxylation, reduction, condensation, ring closing and hydrolyzation. Compared with the prior art, materials such as 3,4-dihydroxynitrobenzene or catechol ethylether, which are expensive and not easy to buy, are replaced by chemical materials, such as plate caustic soda, pyrocatechol, diethyl sulfate, glacial acetic-acid, nitric acid, glycol monoethyl ether, potassium hydroxide, bromodecane, phosphorus oxychloride, ethoxymethylene, sodium hydroxide, etc., which are cheap and easy to obtain, the reaction condition is gental, the integration cost is 50% lower than that of the prior art.