40 results about "Pyrogallol" patented technology

The invention relates to a continuous production method of ultra-pure 2, 3, 4, 4 '-tetrahydroxybenzophenone, which comprises the following steps: completely dissolving p-hydroxybenzoic acid in high-boiling range petroleum ether, and completely dissolving pyrogallic acid in the high-boiling range petroleum ether; the preparation method comprises the following steps: adding a p-hydroxybenzoic acid solution and a pyrogallic acid solution into an ultra-pure continuous reactor group, adding boron trifluoride diethyl etherate into the ultra-pure continuous reactor group at a flowing speed, reacting at 110-140 DEG C, adding the obtained reaction solution into the next ultra-pure continuous reactor group, stirring in ice water, filtering, washing and recrystallizing to obtain the 2, 3, 4, 5-tetramethyl-3, 5-dihydroxybenzoic acid. According to the present invention, the reaction time is substantially shortened, the conversion rate is 70-80%, the purity of the obtained electronic product is more than or equal to 99.2%, the content of the metal ions such as sodium, aluminum, copper, iron, calcium, zinc and boron is less than or equal to 60 ppb, the reaction materials, the reaction temperature and the reaction rate are controllable, the reaction is sufficient, the yield of the obtained target product is stable, and the method can be used for continuous production.

The invention relates to the technical field of medical dressings, in particular to a polyurethane foam dressing and a preparation method thereof. Polyethylene glycol, polyhydroxy chitosan, polyhydroxy pyrogallol, antibacterial silicon dioxide, a foaming agent, 2, 6-toluene diisocyanate and other raw materials are added, and the polyurethane foam dressing is obtained through heat preservation and curing. The polyurethane foam dressing prepared by the invention has good antibacterial and anti-inflammatory effects, so that the polyurethane foam dressing has a wide application prospect in the technical field of medical dressings.

The application belongs to the field of fungicides, and discloses a 1,3,4-oxa / thia-diazole pyrogallol derivative, a preparation method and application, and the structure of the compound is as shown in the formula I: in the formula I, X is an oxygen atom or a sulfur atom; R is a hydrogen atom, a halogen atom or a methoxy group; the halogen is one of F, Cl and Br. The compound has the effect of inhibiting plant pathogenic fungi and preventing and treating plant fungal diseases, and can be applied to plant protection as a fungicide.

This invention discloses a PVDF-modified ultrafiltration membrane based on a tannic acid crosslinking network, its preparation method, and its applications. The membrane is prepared by a phase inversion membrane fabrication method using polyethyleneimine, tannic acid, polyvinylidene fluoride (PVDF), and N,N-dimethylacetamide (NDM). The pyrogallol structure abundant in the tannic acid molecule can coordinate with metal ions and also form a robust covalent crosslinking network with the amine-rich polyethyleneimine through Michael addition and Schiff base reactions. This network firmly anchors TA to the membrane surface and pores, solving the problem of TA loss in traditional modifications. The introduction of TA imparts lasting hydrophilicity to the membrane, significantly improving pure water flux and separation efficiency. Simultaneously, the hydrophilic and positively charged surface synergistically constructed by TA and PEI effectively inhibits the adsorption and deposition of pollutants, endowing the membrane with excellent antifouling performance and operational stability. This PVDF membrane, prepared through a green and simple co-crosslinking strategy, shows broad application prospects in complex water treatment and bioseparation.

The present invention relates to lignin comprising beta-O-4'units bound in position to one or more compounds of formula (I), such as phenol, catechol, resorcinol, hydroquinone, pyrogallol and / or guaiacol, a process for its preparation and its use. And lignin fragment 1.

The invention provides a high-flame-retardant PVC sheath material and a preparation method and application thereof.The high-flame-retardant PVC sheath material is prepared from PVC resin, a composite flame retardant, a composite plasticizer, a stabilizer, internal and external lubricants and pyrogallol in specific parts by weight through reasonable matching of all the components, especially by adding pyrogallol as a compatilizer, the high-flame-retardant PVC sheath material is prepared from the PVC resin, the composite flame retardant, the composite plasticizer, the stabilizer, the internal and external lubricants and pyrogallol; the compatibility among the PVC resin, the composite flame retardant and the composite plasticizer is effectively improved, so that the obtained high-flame-retardancy PVC sheath material has excellent flame retardancy and insulating property, also has excellent mechanical properties, and particularly has relatively high elongation at break and tensile strength.

The invention relates to a carbon-coated silicon-based negative electrode material and a preparation method thereof, a negative electrode plate and a lithium ion battery, and relates to the technical field of battery negative electrode materials, and the preparation method comprises the following steps: dispersing silicon powder in a modification liquid to obtain a hydroxyl modified silicon dispersion system, filtering the hydroxyl modified silicon dispersion system to obtain an intermediate product, dispersing the intermediate product and amino silane in a solvent for reaction, and drying to obtain the carbon-coated silicon-based negative electrode material. The reaction product is filtered, washed and dried, amino modified silicon powder is obtained, and modified liquid contains sulfuric acid and hydrogen peroxide; the preparation method comprises the following steps: dispersing amino modified silicon powder in an aqueous solution of pyrogallol and / or catechol, adjusting the pH value of the dispersed system to 8.0-9.5, adding an aqueous solution containing an amino polymer for reaction, carrying out solid-liquid separation on the reacted system, and calcining the obtained solid product to obtain the carbon-coated silicon-based negative electrode material. The capacity and the cycle life of a battery prepared by compounding the carbon-coated silicon-based negative electrode material and graphite reach an optimal balance state.

This desalination performance recovery agent for a polyamide film contains a solvent and any one of polyvinylpyrrolidone, pyrogallol, or polyvinyl alcohol mixed in a solvent. A desalination performance recovery agent in which polyvinylpyrrolidone is mixed in the solvent has a pH of 10 or less. A desalination performance recovery agent in which pyrogallol is mixed in the solvent has a pH of 6 or less. A desalination performance recovery agent in which polyvinyl alcohol is mixed in the solvent has a pH of 9 or less.

The application belongs to the technical field of natural fruit active substance detection, and discloses a method for simultaneously detecting the contents of multiple active components in green fruits based on HPLC, wherein the active components include seven main active components in green fruits, i.e., pyrogallol, gallic acid, epicatechin, ethyl gallate, p-coumaric acid, epigallocatechin and ellagic acid. The detection method established by the application is good and the instrument is precise, and the method has the technical advantages of good selectivity, high sensitivity and accuracy and reliability for detecting the contents of the main active components in green fruits, thereby providing a new analysis method and reliable basis for quality analysis and quality control of green fruits.

The invention provides a lithium ion battery liquid injection method and a lithium ion battery, the liquid injection method comprises the following steps: primary liquid injection, injection of a first electrolyte into a to-be-injected lithium ion battery, and preparation of a pre-lithiated lithium ion battery, the first electrolyte comprises a first phenolic compound, the molecular structure of the first phenolic compound comprises pyrogallol, and the molecular structure of the first phenolic compound comprises pyrogallol; the mass ratio of the first phenolic compound in the first electrolyte is 2%-3%; and secondary liquid injection is conducted, specifically, a second electrolyte is injected into the pre-lithiated battery, the second electrolyte comprises a second phenolic compound, the molecular structure of the second phenolic compound comprises pyrogallol groups, and the mass ratio of the second phenolic compound in the second electrolyte is 0.5%-1.5%. The liquid injection method can effectively reduce decomposition gas production of the electrolyte, reduce deposition of transition metal on a negative electrode interface, and improve the cycle performance of the lithium ion battery.

This invention relates to a polyisoprene-based phloroglucinol compound, its preparation method, and its applications, belonging to the field of pharmaceutical technology. The structural formula of the compound is shown below. The preparation method involves extracting the fruit of *Garcinia macrocarpa* in an aqueous organic solvent solution, followed by extraction with petroleum ether and dichloromethane, and then purifying the compound using silica gel column chromatography, ODS column chromatography, Sephadex LH-20 gel column chromatography, and semi-preparative high-performance liquid chromatography. The above method is simple and easy to implement, and the resulting compound has a novel structure with a [2,4,1]nonane core structure. It can promote the secretion of insulin in palmitic acid-induced pancreatic β-cells, showing promise for the preparation of drugs for the prevention and treatment of hyperglycemia.

This invention relates to the field of waterborne adhesives, specifically to a waterborne anti-corrosion and environmentally friendly adhesive and its preparation method. The adhesive comprises soft acrylic monomers, hard acrylic monomers, functional monomers, silane-imidazolium-pyrogallol acrylate monomers, emulsifiers, initiators, pH buffers, deionized water, etc. The silane-imidazolium-pyrogallol acrylate monomers are composed of trimethylolpropane, pentaerythritol glycidyl ether, gallic acid, imidazolium-4,5-dicarboxylic acid, 3-aminopropyltriethoxysilane, etc. Gallic acid provides the pyrogallol anti-corrosion group, imidazolium provides the stabilizing corrosion-inhibiting group, silane provides the synergistic effect of adhesion enhancement and corrosion prevention, and the acrylate double bonds achieve copolymerization. The adhesive prepared by this invention exhibits excellent adhesion, tensile shear strength, salt water resistance, salt spray resistance, and emulsion stability. It is also environmentally friendly and free of heavy metals, making it suitable for bonding and protecting metal substrates.

To provide an anti-aging composition capable of removing senescent cells without causing side effects.SOLUTION: The present invention relates to an anti-aging composition containing a fermented barley extract and an organic acid, an anti-aging composition containing a culture or a processed product thereof of lactic acid bacteria cultured in a medium containing a fermented barley extract, and an anti-aging composition containing pyrogallol or gallic acid, wherein theses anti-aging compositions enable a reduction in the number of senescent cells (senolysis) by a senescent-cell-eliminating action that induces apoptosis in senescent cells.SELECTED DRAWING: None

The present invention relates to a reusable Ti<supgt;4+< / supgt>-modified tannic acid-chitosan composite membrane and its preparation and application. Specifically, a "one-pot" strategy is adopted, using chitosan and tannic acid as functional monomers and polyethylene glycol diglycidyl ether as a cross-linking agent. The three reaction monomers are dissolved in acetic acid solution and freeze-dried to form a solid membrane, and then it is heated for epoxy amine ring-opening reaction to obtain a tannic acid-chitosan composite membrane. Since the structure of tannic acid contains pyrogallol groups, which can chelate with titanium ions (Ti<supgt;4+< / supgt;) as ligands, a Ti<supgt;4+< / supgt>-modified tannic acid-chitosan composite membrane is further obtained. This composite membrane can be used as an adsorbent for immobilized metal ion affinity chromatography for the efficient enrichment of phosphopeptides in biological samples. The Ti<supgt;4+< / supgt>-modified tannic acid-chitosan composite membrane has a three-dimensional pore structure. Because Ti<supgt;4+< / supgt> and the pyrogallol ligand can form stable chelation bonds, after the phosphopeptides are eluted from the composite membrane, Ti<supgt;4+< / supgt> will not dissociate from the composite membrane, so it can be reused.

The invention belongs to the technical field of blood fluorine chemical analysis, and discloses a reagent and a method for detecting fluorine ions in blood. The invention discloses a fluorine ion detection reagent of an organic complex containing ferric ions, and the organic complex is selected from one of polyaniline, polydopamine, indocyanine green, Prussian blue, gallic acid, catechin and 1, 2, 3-pyrogallol. The method comprises the following steps: respectively reacting a series of standard solutions with a fluorine ion detection reagent, measuring the temperature change under the irradiation of near-infrared light to obtain a linear equation of the fluorine ion concentration and the temperature change, reacting a sample to be detected with the fluorine ion detection reagent under the same condition, measuring the temperature change, and substituting the measured temperature change into the linear equation to obtain the blood fluorine concentration in the sample to be detected. The method is small in repeated detection variability, high in accuracy and stability, low in detection cost and easy to popularize, and all methodological indexes can meet the requirement for detecting the concentration of the fluorine ions in the blood.

This invention provides a method for preparing pyrogallol A, relating to the field of photoresist materials technology. The method uses 2-phenyl-2-propanol as a starting material and obtains pyrogallol A in a one-pot process. Specifically, aluminum trichloride is added to dichloroethane and stirred to disperse, and acetyl chloride is added dropwise to obtain a complex solution. A dichloroethane solution of 2-phenyl-2-propanol is then added dropwise for reaction. Hydrochloric acid is added for quenching. Phenol, dodecyl mercaptan, and sodium dodecyl sulfate are then added, and the reaction is heated. After the reaction is complete, the mixture is kept at a constant temperature, filtered, washed, and dried to obtain pyrogallol A. The Friedel-Crafts reaction has a high conversion rate, and no post-processing or purification is required after quenching; condensation can be directly performed. Condensation is a heterogeneous reaction, and the reaction time is significantly shortened by adding a catalytic amount of phase transfer catalyst. The preparation method of this invention uses readily available raw materials, produces a product with high purity and high yield, has a short reaction time, is simple to operate, and is low in cost, while also reducing waste, making it suitable for industrial production.

The present invention discloses a modified phenolic resin-based hard carbon material and its preparation method and application, belonging to the technical field of phenolic resin-based hard carbon materials. The present invention creatively uses aldehyde-containing, oxygen-rich glucuronolactone to replace formaldehyde in traditional methods, and uses 1,2,4-pyrogallol containing three phenolic hydroxyl groups, two of which are in the ortho position, to replace phenol in traditional methods. The provided method is easy to prepare thermosetting phenolic resin, and has the advantages of low cost, non-toxicity and pollution-free. The prepared modified phenolic resin-based hard carbon material has a suitable specific surface area, abundant micropores and a larger graphitized interlayer spacing. The specific surface area of the modified phenolic resin-based hard carbon material is 451.51m 2 / g, and the micropore volume is 0.217cm 3 / g; the prepared modified phenolic resin-based hard carbon material is used as the negative electrode material of sodium ion battery, with an initial coulombic efficiency of 86.44%, a platform capacity of 232.8mAh / g at a current density of 0.05A / g, and a capacity retention rate of 83.71% after stable circulation for 1000 cycles with a coulombic efficiency of 99.97% at a current density of 1A / g.

The present disclosure relates to a catechol group- or pyrogallol group-functionalized biocompatible polymer hydrogel patch having excellent biocompatibility and tissue adhesion, and uses for drug delivery, cell transplantation and tissue regeneration using the same. The biocompatible polymer hydrogel patch functionalized with the catechol group or pyrogallol group of the present disclosure has remarkably excellent mechanical properties and tissue adhesion compared with a solution-based bulk hydrogel. Therefore, it can load cells and a drug in vivo for a long time and also safely and efficiently deliver the cells and the drug to a target site.

The invention relates to the technical field of natural medicines, and discloses a polycyclic polyisopentenyl phloroglucinol compound as well as a preparation method and application thereof. The polycyclic polyisopentenyl phloroglucinol compound is a compound as shown in a formula I which is described in the specification. The polycyclic polyisopentenyl phloroglucinol compound disclosed by the invention has remarkable activity of reversing tumor drug resistance, has great potential application value, and also provides a new thought and approach for development of novel preparation of drugs for preventing or treating tumors.

An aqueous coating composition comprising: (A) an emulsion polymer, the present invention relates to a composition comprising (i) from 0.48% to 1.5% by weight of structural units of an ethylenically unsaturated phosphorus-containing monomer, (ii) from 0.7% to 3% by weight of structural units of diacetone (meth) acrylamide, (iii) from 10% to 80% by weight of structural units of a vinyl aromatic monomer, (iv) from structural units of an alkyl (meth) acrylate, and (v) from 0 to 5% by weight of an alpha, beta-unsaturated phosphorus-containing monomer, a structural unit of a [beta]-ethylenically unsaturated carboxylic acid, a salt thereof, or a mixture thereof; (B) a specific dicarboxylic acid at a specific concentration, a salt thereof, or a mixture thereof; (C) from 30% to 60% by weight of a thio, amido or imidogen derivative of triphosphonic acid, a salt thereof or a mixture thereof; (D) a water-soluble alkali metal silicate present in an amount to provide a dry weight ratio of (D) to (C) of 1.2 to 3.7; and (E) from 40% to 52% by weight of tannic acid, gallic acid, pyrogallol or citric acid; salts thereof; or a combination thereof; wherein the weight percentages are relative to the weight of the emulsion polymer. A method of making a coating comprising a base coat made from the aqueous coating composition.

This invention discloses a method for preparing a nitrogen-containing heterocyclic D-A type COF photocatalyst and its application. The specific steps are as follows: Step S1, an aldehyde ligand and an amino ligand are added to a Pyrex reaction tube at a molar ratio of 2:3. The aldehyde ligand is a trialdehyde pyrogallol, and the amino ligand is an aromatic amine compound containing a nitrogen-containing heterocyclic ring. Step S2, a mixed organic solvent composed of mesitylene and 1,4-dioxane is added to the Pyrex reaction tube from Step S1, and an aqueous acetic acid solution is added as a catalyst to obtain mixture a. Step S3, the Pyrex reaction tube containing mixture a from Step S2 is ultrasonically treated to form a uniform suspension. This invention relates to the field of functional materials and photocatalysis technology. The structure is precisely designed, and the nitrogen-containing heterocyclic ring significantly modulates the D-A effect. In this invention, the 1,3,5-trihydroxypyrogallol and the nitrogen-containing heterocyclic amine ligand are covalently linked to form a donor-acceptor (D-A) structure with a significant electron push-pull effect within a covalent organic framework.

The present invention provides polymerizable compounds that, even without a catechol skeleton or pyrogallol skeleton, can impart or further enhance adhesiveness and tackiness, and can be used to prepare adhesive and tackiness-forming compositions and adhesive and tackiness polymers that can form adhesive layers with excellent adhesive and tackiness on various substrates. [Solution] The polymerizable compound is represented by the following general formula (1) and is useful as a material for preparing, for example, a composition for forming adhesive or tacky layers or an adhesive or tacky polymer. TIFF2026122770000020.tif41170 (In general formula (1), R represents a hydrogen atom or a methyl group)

To provide a desalination performance recovery agent for a polyamide membrane for recovering desalination performance of the polyamide membrane, a desalination performance recovery method of the polyamide membrane, and a desalination performance improvement method of the polyamide membrane.SOLUTION: The desalination performance-recovering agent for a polyamide membrane contains a solvent and any one of polyvinylpyrrolidone, pyrogallol, and polyvinyl alcohol mixed in the solvent, wherein the desalination performance-recovering agent in which polyvinylpyrrolidone is mixed in the solvent has a pH of 10 or less, the desalination performance-recovering agent in which pyrogallol is mixed in the solvent has a pH of 6 or less, and the desalination performance-recovering agent in which polyvinyl alcohol is mixed in the solvent has a pH of 9 or less.SELECTED DRAWING: Figure 4

The invention relates to a composite membrane for efficiently and selectively capturing trivalent chromic ions and a preparation method of the composite membrane. The composite membrane is composed of a polyethersulfone (PES) base membrane, a zinc ion and biomolecule self-assembly layer and a ZIF-8 metal organic framework layer. The preparation method comprises the following steps: synergistically modifying the surface of the PES base membrane through pyrogallol and amino acid to form a stable negative charge layer; zinc ions and biomolecules are self-assembled on the surface of the modified membrane by utilizing electrostatic interaction, and a ZIF-8 layer is grown in situ by taking the modified membrane as a substrate. According to the composite membrane, efficient capture of Cr < 3 + > is achieved through the pore confinement effect and the surface functional group coordination effect of ZIF-8, the adsorption capacity is improved, the rejection rate exceeds 99%, and the composite membrane shows excellent selective adsorption performance in a complex coexisting ion system.

The invention belongs to the technical field of concrete, and particularly relates to a mud-resistant polycarboxylate superplasticizer and a preparation method thereof. The mud-resistant polycarboxylate superplasticizer is prepared from a zwitterionic monomer, an unsaturated functional monomer containing a primary amine group, an unsaturated polyether macromonomer, an unsaturated acid monomer, formaldehyde, pyrogallic phenol, a chain transfer agent, an initiator, a reducing agent and deionized water. Wherein the zwitterionic monomer is carboxyl betaine methacrylate, and the unsaturated functional monomer containing the primary amine group is 2-aminoethyl methacrylate hydrochloride. The product has the characteristics that the silt content is gt; and in a severe aggregate environment with the content of 5%, extremely high effective adsorption capacity can be maintained only by low mixing amount, and the sensitivity of the concrete to the silt content of sand and gravel is remarkably reduced.

The present invention provides a method for preparing a spray-on double-crosslinked hydrogel antifouling coating, the antifouling coating, and its application, belonging to the field of surface processing coatings. The method comprises: pretreating a spray-on substrate to obtain an oil- and water-free working surface; uniformly mixing a polyvinyl pyrrolidone solution and a polyethyleneimine solution to obtain a prepolymer, and adding a dispersant to obtain a mixture; mixing the mixture with vanadium pentoxide and placing it in a spray bottle to obtain a prepolymer spray; and sequentially spraying the prepolymer spray and pyrogallol spray onto the substrate surface to obtain a flocculent coating, which is the double-crosslinked hydrogel antifouling coating. The spray-on double-crosslinked hydrogel coating provided by the present invention has strong wet adhesion strength, and the critical pressure required to completely peel the coating applied to stainless steel reaches 30N. The spray-on double-crosslinked hydrogel coating can achieve an inhibition rate of over 99% against bacteria and algae under static conditions.

The invention relates to an application of a polycyclic polyisopentenyl phloroglucinol compound Atenuamione D, which is extracted and separated from Hypericum sampsonii Hance, in preparation of a medicine for treating hepatocellular carcinoma, in particular to an application of the polycyclic polyisopentenyl phloroglucinol compound Atenuamione D in preparation of a medicine for treating hepatocellular carcinoma. The in-vivo pharmacological research shows that the polycyclic polyisopentenyl phloroglucinol compound can obviously reduce the tumor weight of nude mice with hepatocellular carcinoma under the dosage of 25 mg / kg and 50 mg / kg, can reverse the purine metabolism abnormality of nude mice with hepatocellular carcinoma, and can be used for preparing the medicine for treating hepatocellular carcinoma.

The invention discloses a preparation method and application of a tannic acid metal polyphenol network modified PVDF ultrafiltration membrane. The modified PVDF ultrafiltration membrane comprises transition metal chloride, tannic acid, polyvinylidene fluoride and N, N-dimethylacetamide, and is prepared by adopting a phase inversion membrane preparation method. Tannic acid contains a large amount of catechol and pyrogallol groups and can be complexed with metal ions to form a stable octahedral complex, so that the toxicity of metal elements is reduced, and the biocompatibility of metal is improved; tannic acid has good hydrophilicity and can be introduced into the PVDF ultrafiltration membrane to greatly improve the flux of the membrane, so that the separation efficiency of the membrane is improved; a metal polyphenol network is formed through coordination of tannic acid and metal ions, the surface property of the membrane is improved, adsorption of pollutants is reduced, the problem of membrane pollution is effectively solved, the service life of the membrane is prolonged, and the modified ultrafiltration membrane has a wider application prospect in the fields of biological separation and the like.

The invention discloses a nitrogen-phosphorus / nitrogen-sulfur-doped hierarchical pore carbon material for a supercapacitor and a preparation method, and belongs to the technical field of preparation of carbon materials of supercapacitors. The technical problems that in the prior art, a hierarchical pore carbon material is poor in pore structure and impurity element doping coordination, and hierarchical pore regulation and control precision is insufficient are solved. The method comprises the following steps: firstly, preparing a soft template; the preparation method comprises the following steps: adding a prepolymer formed by m-aminophenol, formaldehyde and resorcinol or phloroglucinol into a soft template; wherein the pore-enlarging agent and the segmented copolymer form a supramolecular aggregate, and the supramolecular aggregate and the prepolymer are assembled through hydrogen bonds to obtain the phenolic resin gel. Adding an activating agent KOH into the phenolic resin gel for grinding; carrying out one-step carbonization activation reaction on the ground material to obtain an in-situ nitrogen-doped hierarchical porous carbon material; and finally, adding a doping agent into the in-situ nitrogen-doped hierarchical pore carbon material for grinding, and then putting into a ball milling tank for mechanical doping. No solvent is used in the operation process, so that the method is green and environment-friendly.

To provide a photosensitive resin composition that exhibits good developability and provides a resin cured film with favorable adhesion and favorable solvent resistance.SOLUTION: A modified polyol compound in which a part of hydroxyl groups possessed by a polyol compound is modified into a structure having an ethylenically unsaturated group, the polyol compound having two or more aromatic rings, and at least one of the aromatic rings taking one or more structures selected from the group consisting of a catechol structure and a pyrogallol structure.SELECTED DRAWING: None