7 results about "Pyrogallol" patented technology

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.

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.

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.

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.

This invention discloses a biphenyl pyrogallol compound having the structure shown in formula (I). The biphenyl pyrogallol compound provided by this invention is an important intermediate for the synthesis of tripentate phosphite ligands of the biphenyl skeleton, playing a crucial role in hydroformylation reactions and their industrial applications. This invention also provides various methods for preparing biphenyl pyrogallol compounds, including an oxidative coupling method. The oxidative coupling method provided by this invention allows for the one-step synthesis of biphenyl pyrogallol compounds, offering advantages such as readily available and inexpensive catalysts, simple operation, good yield, low cost, and the ability to produce on a large scale.

This invention discloses a method for preparing a low-allergenic and highly stable peanut protein gel, belonging to the field of food processing technology. This invention utilizes a synergistic strategy of combining physical-chemical coupling pretreatment and laccase-catalyzed cross-linking of pyrogallol structural polyphenols. This makes peanut protein more readily acted upon by laccase, facilitates the entry of pyrogallol polyphenols into the protein network, and results in more uniform and complete enzymatic cross-linking, ultimately yielding a peanut protein gel with excellent gel strength and stability and lower allergenicity. Specifically, the synergistic effect of the physical / chemical coupling pretreatment ensures more thorough depolymerization of peanut protein and more complete molecular chain extension, exposing numerous reaction sites and laying the foundation for subsequent laccase-induced cross-linking of peanut protein with pyrogallol structural polyphenols to prepare the gel. Under laccase catalysis, the pyrogallol structural polyphenols are oxidized to polyquinone intermediates with more cross-linking sites, which bind to the active sites of the pretreated and modified peanut protein, ultimately forming a dense three-dimensional network structure peanut protein gel.