76 results about "Hydroquinone Compound" patented technology

The invention relates to the technical field of composite materials, in particular to a polyaryletherketone-based shape memory composite material and a preparation method thereof. Comprising a terpolymer, shape memory polyurethane, a first heat-conducting filler and a second heat-conducting filler, 4, 4 '-difluorobenzophenone and hydroquinone are firstly pre-polymerized to obtain a PEEK prepolymer, the PEEK prepolymer is terminated by a hydroxyl olefine acid ester monomer to obtain a terminated copolymer, and then an acrylate monomer and the terminated copolymer are subjected to double-bond addition to obtain the terpolymer; the first heat-conducting filler is a one-dimensional nano heat-conducting filler; the second heat-conducting filler is a zero-dimensional and / or two-dimensional heat-conducting substance; the prepared composite material has the shape fixing rate of 85% or above and the shape recovery rate of 87% or above, the recovery time is shorter than 25 seconds, and the good shape memory performance is achieved.

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyolefin composite material as well as a preparation method and application thereof. The polyolefin composite material is prepared from the following raw materials: polyethylene, a polyolefin toughening agent, a compound flame retardant and a filler, the melt index of the polyethylene at 190 DEG C / 2.16 kg is greater than or equal to 18 g / 10 min, and the bending modulus is less than or equal to 160 MPa; the polyolefin toughening agent is selected from at least one of an ethylene-propylene copolymer, an ethylene-butylene copolymer and an ethylene-vinyl acetate copolymer, and the melt index at 230 DEG C / 2.16 kg is greater than or equal to 9 g / 10 min; the compound flame retardant comprises tetrabromobisphenol S bis (2, 3-dibromopropyl) ether, antimony trioxide and hydroquinone bis (diphenyl phosphate), and the filler is at least one of talcum powder, barium sulfate and wollastonite. Through specific types of polyethylene, the polyolefin flexibilizer, the compound flame retardant and the filler, excellent flame retardance and toughness can be obtained.

The invention discloses a preparation process of polyether-ether-ketone, and relates to the technical field of preparation of inorganic compounds. The preparation process comprises the following steps: reacting 4, 4 '-difluorobenzophenone, sodium carbonate and hydroquinone to generate polyether-ether-ketone, taking a polyaryletherketone block oligomer as an end-capping reagent, reacting 4, 4'-difluorobenzophenone with 4, 4 '-dimercaptodiphenyl sulfone, and then reacting with pentaerythritol phosphate to obtain the polyaryletherketone block oligomer. The thioester bond reversibly breaks at the polymerization temperature, exposed active sulfenyl reacts with hydroxyl at the tail end of the polyether-ether-ketone to form a more stable covalent bond, volatilization of the end-capping reagent is avoided, meanwhile, the initial decomposition temperature of the end-capped polyether-ether-ketone is increased, and the stability of the end-capping reagent is improved. The polyether-ether-ketone generated in the polyether-ether-ketone resin product is subjected to treatment procedures of crushing, organic solvent extraction, water washing, filtering, drying and the like, so that the product polyether-ether-ketone is obtained, less three wastes are generated, the solvent can be recycled, the atom economy is relatively high, and the preparation process of comprehensive utilization of resources is realized.

The application discloses a buried bottom interface reinforced large-area perovskite battery module and a preparation method thereof, and relates to the field of solar cells. The buried bottom interface of the large-area perovskite battery module is composed of a hole transport layer, an interface reinforcing layer and a self-assembled monolayer, wherein the interface reinforcing layer is an interface regulating layer of a potassium hydroquinone sulfate coordination structure, the interface regulating layer is coordinated with metal ions on the surface of a metal oxide through phenolic hydroxyl groups and is passivated, and sulfate groups anchor under-coordinated lead ions, so as to form a dual-functional buried bottom interface coupling structure. The high oxidation state defects on the surface of the magnetron sputtering NiOx film are passivated through the potassium hydroquinone sulfate interface reinforcing layer, the combination between the NiOx and the SAM is enhanced, and the stability of the large-area perovskite battery is improved.

The preparation method comprises the following steps: immobilizing a specific capture antibody Ab1 of a carcino-embryonic antigen on the surface of a gold electrode, closing a non-specific site by bovine serum albumin to obtain a BSA / Ab1 / GE working electrode, capturing the carcino-embryonic antigen, fusing the carcino-embryonic antigen with an enzyme-coated HHOF-Ab2 nano probe, and detecting the enzyme-coated HHOF-Ab2 nano probe to obtain the sandwich type electrochemical immunosensor based on the enzyme-coated hydrogen bond organic framework hybrid catalyst. The enzyme coated HOF-based sandwich type electrochemical immunosensor is obtained; the sensor specifically recognizes CEA through 'Ab1-CEA-Ab2' double antibody sandwich, the cyclic reaction of H2O2 and HQ is catalyzed by virtue of the enzyme-coated HOF nanoprobe to amplify a signal, and finally chemical change caused by oxidizing hydroquinone into benzoquinone is converted into quantifiable current by virtue of an electrochemical workstation, so that ultra-sensitive detection of CEA is realized, and the sensor has the advantages of high sensitivity, high response speed, strong specificity and the like.

The application discloses a kind of sodium ion battery electrolyte and preparation method thereof, it is related to sodium ion battery technical field, the electrolyte includes: sodium salt, composite solvent, additive and auxiliary agent, the sodium salt is sodium difluorosulfurylimide, sodium bis-trifluoromethanesulfonimide and modified sodium borate dihydroxide dioxalate compound composition, composite solvent is sulfolane-1,3-propanediol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, additive is modified 1,3-propane sulfone lactone, trimethyl phosphate and hydroquinone dimethyl ether, auxiliary agent is nano ZIF-8.This electrolyte sodium borate dihydroxide dioxalate is modified after hydrogen peroxide treatment, with high-efficiency anti-hydrofluoric acid capacity, while using the auxiliary agent of nano ZIF-8, sodium salt and auxiliary agent form synergistic effect can be targeted to remove hydrogen fluoride sodium salt and moisture reaction generated in electrolyte hydrofluoric acid, avoid the damage of hydrofluoric acid to negative electrode SEI film, and then improve the cycle life of sodium ion battery.

The invention belongs to the technical field of electrolytic preparation, and discloses a method for preparing hydroquinone by taking quinone hydroquinone as a raw material through electrolytic reduction. The method comprises the following steps: adding an acidic aqueous solution into the anode chamber of the H-type electrolytic cell; adding an acidic aqueous solution, quinone-hydroquinone and a cosolvent into a cathode chamber of the H-type electrolytic cell; carrying out electrolytic reduction to obtain an electrolyte containing hydroquinone in the cathode chamber; performing extraction treatment on the electrolyte containing hydroquinone to obtain an organic phase and a water phase containing hydroquinone; and carrying out cooling crystallization treatment on the hydroquinone-containing water phase to obtain a hydroquinone product. The hydroquinone product obtained by the method is high in yield and high in purity.

The invention relates to certain chromanol, quinone or hydroquinone compounds and derivatives thereof for treatment of Alzheimer's disease and / or for improving memory function and / or reducing plaque load. Specifically, the present invention relates to chromanol compounds chosen from (6-hydroxy-2,5,7,8-tetramethylchroman-2yl)(piperazin-1-5 yl)methanone, ((S)-6-hydroxy-2,5,7,8-tetramethyl-N-((R)-piperidin-3-yl)chroman-2- carboxamide hydrochloride and S-(6-hydroxy-2,5,7,8-tetramethylchroman-2-yl)(4-(2- hydroxyethyl)piperazin-1-yl)methanone, and pharmaceutically acceptable salts thereof.

The application provides a spherical lignin-phenolic resin and a preparation method and application thereof in adsorbing N-containing organic dyes, and belongs to the technical field of adsorbing materials. The lignin-phenolic resin with regular spherical morphology is prepared by one-step condensation polymerization reaction through the reverse suspension polymerization method under acid catalysis, wherein lignin, hydroquinone and trioxane are used as raw materials. The lignin belongs to renewable resources, has the characteristics of low cost and environmental friendliness, can replace phenol as the main phenol source, and the replacement rate can reach 75%. The yield of the synthesized phenolic resin is as high as 60-80%. In addition, the monomer type can be selected to introduce rich phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups in the resin, the monomer ratio is controlled to change the crosslinking structure of the resin, the adsorption capacity of the resin for N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be realized.

The present application relates to the technical field of electrochemical analysis detection, and particularly relates to a modified glassy carbon electrode for sensitive detection of tert-butyl hydroquinone, a preparation method and application, which has a high specific surface area and catalytic activity, and has good conductivity, and can realize sensitive detection of tert-butyl hydroquinone, the modified glassy carbon electrode comprises a glassy carbon electrode and a composite coating, the composite coating is wrapped on the surface of the glassy carbon electrode, and the composite coating is composed of graphene oxide and a Ti-based MOF derivative; the preparation method comprises the following steps: (1) preparation of MIL-125 (Ti); (2) preparation of TiO2 / NC; (3) preparation of 15% GO@TiO2 / NC; (4) preparation of a 15% GO@TiO2 / NC composite material dispersion liquid; (5) preparation of a modified electrode; and the application comprises the following steps: S1, establishing a concentration-electrochemical response signal relationship; S2, determining the concentration of a to-be-detected substance.

This application relates to the field of materials technology, providing a chitosan-polyacrylonitrile composite material, its preparation method, and its application. The general structural formula of the chitosan-polyacrylonitrile composite material is as follows: This application uses inexpensive chitosan and polyacrylonitrile fiber as raw materials to develop a novel chitosan-polyacrylonitrile composite material, overcoming the solubility limitation of chitosan under acidic conditions and simultaneously enhancing its adsorption capacity for phenolic compounds and heavy metals. It exhibits higher selectivity for target pollutants, especially among eight different phenolic compounds (phenol, 4-methylphenol, 4-chlorophenol, 4-nitrophenol, hydroquinone, catechol, resorcinol, and phloroglucinol), showing excellent adsorption performance for hydroquinone, with an adsorption capacity as high as 316.84 mg·g⁻¹. ‑1 Furthermore, this application addresses the soft metal ion Hg. 2+ Its adsorption capacity is outstanding, with a maximum adsorption capacity of 237.18 mg·g⁻¹. ‑1 .

This invention discloses a compound additive and its application in removing corrosive sulfur from mineral insulating oil, relating to the field of insulating oil additives. It includes a first inhibitor, a second inhibitor, a first antioxidant, and a second antioxidant. The first inhibitor is a benzotriazole derivative, and the second inhibitor is a thiadiazole derivative and / or methylbenzotriazole. The first antioxidant is pyrogallol, and the second antioxidant is butylated hydroxytoluene and / or tert-butylhydroquinone. This additive uses a compound inhibitor and a compound antioxidant. When applied to mineral insulating oil, the synergistic effect of the compound inhibitor improves the insulating oil's resistance to corrosive sulfur. Simultaneously, the compound antioxidant and compound inhibitor are balanced to maximize the insulating oil's oxidation resistance, providing continuous and efficient protection for mineral insulating oil in actual operation, resulting in excellent physical and electrical properties.

The invention relates to the field of synthesis and preparation of hydroquinone, in particular to a synthesis method of high-purity hydroquinone. In order to solve the problem that in the existing process of preparing hydroquinone through a phenol hydrogen peroxide oxidation method, the selectivity of hydroquinone (HQ) is improved, and by-products with similar microstructures are generated synergistically and are difficult to remove, a composite catalysis synergistic inhibition system of phosphotungstic acid, tetrabutylammonium bromide and imidazole is adopted; through the synergistic effect of the main catalyst, the selectivity regulator and the byproduct inhibitor, HQ selectivity improvement and synchronous inhibition of trace byproducts are achieved under the optimized reaction condition, the total content of the trace byproducts is smaller than or equal to 45 ppm, the purity of the final hydroquinone product is larger than or equal to 99.995%, and the high-end application requirements of electronic-grade and photoresist raw materials are met. The technology is compatible with existing industrial equipment, operation is easy, and industrial production is met.

The application discloses a synthesis method of benzodifuran dione and derivatives thereof, and belongs to the field of synthesis of conductive polymers. The method takes hydroquinone and derivatives thereof as basic raw materials, and is characterized in that: the hydroquinone and derivatives thereof are first reacted with 3-chloropropylene under alkaline conditions, and then subjected to a Claisen rearrangement to generate an intermediate, and then subjected to a Criegee rearrangement under the action of ozone to generate benzodifuran dione or derivatives thereof. The method establishes a stable, simple and efficient synthesis process of benzodifuran dione through rearrangement and oxidation reactions, provides guarantee for stable supply of polybenzodifuran dione materials and high conductivity and other performances, and lays an important foundation for a next-generation high-performance and sustainable organic electronic material system.

The invention belongs to the technical field of chemical catalysts, aims to solve the technical problems of high energy consumption, more byproducts, poor economical efficiency and the like of a process for preparing phenol by catalyzing benzene oxidation through a catalyst in the prior art, and particularly discloses a metal catalyst for co-producing phenol and hydroquinone through benzene oxidation and a preparation process. Two metal components of gallium and zinc are used for modification, the molecular formula is Ga-Zn / FeOx, and the catalyst is used for catalyzing hydrogen peroxide to oxidize benzene and co-produce phenol and hydroquinone. The catalyst Ga-Zn / FeOx is prepared by taking ferric oxide (FeOx) as a main body and modifying two metal components, namely gallium and zinc, and is used for catalyzing hydrogen peroxide to oxidize benzene and optimizing a reaction process, so that hydroquinone with high additional value is co-produced when phenol is prepared through a benzene oxidation reaction while the reaction conversion rate of benzene is increased, and the technical economy is remarkable.

The invention discloses a synthesis method of benzodifuran diketone and derivatives thereof, and belongs to the field of conductive polymer synthesis. The method comprises the following steps: by taking hydroquinone and derivatives thereof as basic raw materials, firstly reacting with 3-chloropropene under an alkaline condition, generating an intermediate through claisen rearrangement, and then generating benzodifuran diketone or derivatives thereof through claisen rearrangement under the action of ozone. According to the present invention, through the rearrangement reaction and the oxidation reaction, the stable, simple and efficient benzodifuran diketone synthesis process is established, the guarantee is provided for the stable supply, the high conductivity and other properties of the polybenzodifuran diketone material, and the important foundation is laid for the next generation of the high-performance and sustainable organic electronic material system.

The application provides a catalyst composition, application thereof and a synthesis method of cyhalofop-butyl, which comprises the following steps: reacting a compound shown in formula (1) with hydroquinone and an alkaline substance under the action of a catalyst composition at 0-90 DEG C to obtain a compound shown in formula (2); and reacting the compound shown in formula (2) with 4-chloro-3-fluorobenzonitrile under the action of the catalyst composition at 80-100 DEG C to obtain a compound shown in formula (3). The catalyst composition provided by the application has the advantages of high catalytic efficiency and small product pollution when catalyzing aryl etherification. The synthesis method of the compound cyhalofop-butyl shown in formula (3) has the advantages of easy raw material, high yield, low cost, mild reaction condition, environmental friendliness and meeting the requirements of green chemistry; the compounds shown in formula (1)-(3) are shown in the following formula.

The invention relates to the technical field of electrochemical analysis and detection, in particular to a preparation method and application of a graphene oxide and Co LDHs compound electrode. The compound electrode comprises a glassy carbon electrode and a compound coating, the compound coating wraps the surface of the glassy carbon electrode, the compound coating is a two-dimensional multilayer heterojunction formed by in-situ synthesis of graphene oxide of a two-dimensional structure and Co LDHs, agglomeration is avoided, it is guaranteed that active sites are fully exposed, and the graphene oxide and the Co LDHs synergistically enhance the structural stability and the electrochemical activity. The preparation method comprises the following steps: mixing 2-methylimidazole, graphene oxide and cobalt nitrate, performing solvothermal reaction to obtain a GO / Co LDHs composite material, and then dispensing the GO / Co LDHs composite material on the surface of a pretreated glassy carbon electrode to obtain the compound electrode. The composite electrode has high specific surface area and catalytic activity, has good conductivity, and can realize sensitive detection of tert-butylhydroquinone.

The invention relates to the technical field of synthesis of hydroquinone dihydroxyethyl ether, in particular to a synthesis method of high-purity hydroquinone dihydroxyethyl ether. Comprising the following steps: enabling hydroquinone and ethylene carbonate to react in the presence of a compound catalyst in the absence of a solvent and under the protection of inert gas; after the reaction is finished, cooling a reaction mixture, and adding a reducing agent for reduction treatment to obtain a reaction crude product; sequentially carrying out reduced pressure rectification and melt crystallization treatment on the reaction crude product to obtain refined hydroquinone dihydroxyethyl ether; by adopting a compound catalyst system consisting of a basic catalyst and an organic catalyst, the reaction selectivity and efficiency are remarkably improved, and the generation of monosubstituted byproducts is effectively inhibited; and by combining the reduction treatment at the later stage of the reaction and the purification process of vacuum distillation and melt crystallization, impurity introduction and oxidation side reaction are avoided, so that the hydroquinone dihydroxyethyl ether with high purity and low product chroma is efficiently obtained.

The invention discloses a chain extender composition as well as a preparation method and application thereof, the chain extender composition comprises hydroquinone dihydroxy ethyl ether and an addition component, the addition component is a reactant of hydroquinone dihydroxy ethyl ether and a lactone substance, and the lactone substance comprises one or more of a four-membered ring, a seven-membered ring and an eight-membered ring; the mass ratios of the hydroquinone dihydroxy ethyl ether and the addition component in the chain extender composition are 70 to 90 percent and 10 to 30 percent respectively; the melting point of the chain extender composition is 80-95 DEG C. The melting point of the chain extender composition is lower than that of pure hydroquinone dihydroxy ethyl ether, and the chain extender composition has a supercooling phenomenon and is slowly crystallized compared with the pure hydroquinone dihydroxy ethyl ether, so that the chain extender composition is relatively long in operation period in actual use and can effectively avoid defects in production of polyurethane elastomers. Compared with HQEE, when the chain extender composition disclosed by the invention is used for preparing a polyurethane elastomer, the physical properties of the elastomer are not obviously reduced, and even the stretching and tearing properties are improved.

This invention provides a cerium oxide-based polishing slurry for STI structures. The slurry comprises, by total mass, 0.05 wt%–5 wt% nano-cerium dioxide abrasive, 0.02 wt%–0.2 wt% hydroquinone, 0.05 wt%–0.25 wt% pyridinecarboxylic acid, 0.01 wt%–0.5 wt% D-sorbitol, and 0.001 wt%–0.01 wt% 1,2-benzisothiazolin-3-one, with a pH of 3–5. The cerium oxide-based polishing slurry provided by this invention, by adding a reducing agent to gently fine-tune the CeO2 surface activity to increase the Ce3+ content, promotes the removal rate of TEOS. Through the synergistic effect of other inhibitors and passivators, a high TEOS:Si3N4 selectivity ratio is obtained. Inhibiting the removal rate of Si3N4 indirectly avoids excessive grinding of oxides in the trenches, resulting in better wafer surface planarization efficiency.

The application discloses a product separation method of phenylenediamine prepared by a phenol hydroxylation method, which comprises the following steps: (1) sending the phenol hydroxylation reaction liquid into a vacuum dehydration tower for dehydration; (2) sending the mixture in the tower kettle of the vacuum dehydration tower into a thin film scraped blade evaporator for coke removal; (3) sending the gas phase mixture collected from the top of the thin film scraped blade evaporator into a phenol removal tower, and separating phenol; (4) sending the mixture in the tower kettle of the phenol removal tower into an o-phenylenediamine rectification tower for product refining, and separating o-phenylenediamine; (5) washing, filtering and removing coke from the p-phenylenediamine crude product solution in the tower kettle of the o-phenylenediamine rectification tower; and (6) decolorizing and crystallizing the p-phenylenediamine solution after the coke removal, and obtaining p-phenylenediamine. By means of the above-mentioned synergistic effect, the phenol hydroxylation reaction liquid is efficiently and high-quality separated.

The present application relates to the technical fields of phenolic compound preparation extraction, and discloses a high-efficiency extraction device for phenolic compound production by phenol hydroxylation method, which comprises an extraction reaction kettle for high-efficiency extraction of phenolic compound preparation, an opening and closing mechanism located above the extraction reaction kettle, a high-efficiency extraction mechanism located inside the extraction reaction kettle, and a solid-liquid separation mechanism located above the high-efficiency extraction mechanism. The high-efficiency extraction device for phenolic compound production by phenol hydroxylation method is convenient for mixing reaction of phenol solid powder to be reacted with one of sulfuric acid, nitric acid, sodium chloride, hydrogen peroxide and other liquids by rotating the clasp to cooperate with the stirring branch rod, and is convenient for phenol hydroxylation method production of phenolic compound. The reacted liquid is separated by the solid-liquid separation mechanism, the clasp is rotated to drive the crushing sharp bolt to crush the filter cake, the crushing leaves are convenient for further crushing of the filter cake, the reaction solvent is put in for further reaction and extraction, and the above steps are repeated for multiple times, so that the high-efficiency extraction of phenolic compound is realized.

The application relates to the technical field of benzenediols, and discloses a method for preparing benzenediols, which comprises the following steps: carrying out an oxidation reaction of benzene and an oxidant in the presence of a titanium silicalite and an optional organic solvent; wherein the titanium silicalite comprises a doped metal element which enters the skeleton structure of the titanium silicalite, the bond length between the doped metal element and O atoms in the skeleton of the titanium silicalite is 0.02-0.55 nm, and the doped metal element comprises a group VIII and / or group IB metal element. By adopting the titanium silicalite containing the doped element as a catalyst, the conversion rate of benzene in the process of preparing phenol by benzene hydroxylation, the total yield of benzenediols and the selectivity of hydroquinone can be effectively improved.

The invention discloses a novel binuclear chiral catalyst for preparing S-epichlorohydrin with high optical purity as well as a synthesis method and an application method of the novel binuclear chiral catalyst. The molecular formula of the catalyst is [Co2L (Y) 2]. NH2O, L is a Salen tetradentate ligand formed by condensation of (R, R)-1, 2-cyclohexanediamine, 3-tert-butyl-2, 5-dihydroxybenzaldehyde and 4-oxa-1, 7-pimelic acid, and Y is a sulfonate radical or an acetate radical. The preparation method comprises the following steps: carrying out acidic hydrolysis on 2-cyanoethyl ether to obtain 4-oxa-1, 7-pimelic acid; 2-tert-butylhydroquinone is subjected to protection, formylation and deprotection, and benzaldehyde is prepared; carrying out condensation on the Salen ligand and (R, R)-1, 2-cyclohexanediamine to generate dialdehyde, and cyclizing the dialdehyde with (R, R)-1, 2-cyclohexanediamine to obtain a Salen ligand; and finally, complexing with cobalt acetate and acid under nitrogen to separate out a catalyst crystal. When the catalyst is used for epoxy chloropropane water-phase resolution and gas-phase detection, the reaction is terminated when ee is greater than or equal to 99.5%, the catalyst is directly filtered and recovered, the S-epoxy chloropropane is obtained through reduced pressure distillation, the ee is still greater than or equal to 99.0% after the catalyst is circulated for five times, and the recovery rate is greater than or equal to 92%.

The invention belongs to the technical field of food, and discloses a compound biological preservative antioxidant softener capable of prolonging the shelf life of cakes and application of the compound biological preservative antioxidant softener. The compound biological preservative antioxidant softener comprises the following components in percentage by mass: a part A: 14.58% of sodium propionate, 5.83% of potassium sorbate, 34,99% of mono-and diglycerides of fatty acids, 1.75% of nisin and 0.87% of epsilon-polylysine, and a part B: 14.58% of sodium propionate, 5.83% of potassium sorbate, 34,99% of mono-and diglycerides of fatty acids, 1.75% of nisin and 0.87% of epsilon-polylysine; a part B: propylene glycol (34.99%); and a part C: tea polyphenol (4.66%) and tert-butylhydroquinone (2.33%). When the prepared compound biological preservative antioxidant softener is added into a cake product, the shelf life can be remarkably prolonged, and meanwhile the quality of the cake is remarkably improved.

The invention discloses an arbutin analogue, a preparation method thereof and application of the arbutin analogue in preparation of a medicine for treating chronic colitis, and belongs to the technical field of medicines. The arbutin analogue is structurally characterized in that a galactosyl group is connected with a polysubstituted benzene ring through a flexible connecting chain-(CH) n-O-to form a novel structure which is remarkably different from a known compound arbutin. The arbutin analogue is prepared through chemical synthesis, and a pharmaceutical composition containing the arbutin analogue is provided. Pharmacological experiments prove that the representative compounds hydroquinone monogalactoside and 3, 4-dihydroxyphenol galactoside show disease treatment activity obviously superior to that of arbutin in a DSS-induced mouse chronic colitis model, the disease activity index can be effectively improved, and colon tissue damage can be relieved. Therefore, the compound provided by the invention can be used for preparing medicines for preventing and / or treating chronic colitis. Formula (1)

A composition includes: an ultraviolet absorber; a curable compound; and an anti-fading agent, in which the ultraviolet absorber includes at least one selected from a compound represented by Formula (1) or a polymer including a structure derived from the compound represented by Formula (1), and the anti-fading agent includes at least one selected from an amine compound, a phenol compound, a hydroquinone compound, a catechol compound, an ascorbic acid compound, a carotenoid compound, a metal complex compound, or a benzolactone compound. A cured substance and an optical member, which are formed of the above-described composition.

The invention belongs to the technical field of benzenediol synthesis, and provides a preparation method of catechol and hydroquinone. According to the preparation method, phenol and hydrogen peroxide are subjected to a hydroxylation reaction under the condition of a catalyst, the hydroxylation reaction is carried out in a mixed solvent containing small-molecule binary acid, and the catalyst is a porous carbon loaded nano metal oxide composite catalyst. According to the preparation method, catechol and hydroquinone are prepared through phenol hydroxylation reaction, small-molecular dibasic acid is added into a reaction system, the hydroxylation reaction process is accelerated, and deep oxidation of catechol is inhibited; the porous carbon loaded nano metal oxide composite catalyst is prepared by in-situ synthesis, in-situ compounding of a porous carbon skeleton and nano metal oxide and interaction of the nano metal oxide and porous carbon are realized, an activation path of hydrogen peroxide is optimized, and deep oxidation of diphenol is inhibited; copper and zinc are used as metal elements, the ratio of copper to zinc is controlled, and the selectivity of the product is improved; the reaction temperature is reduced.

The invention belongs to the technical field of adhesives, and relates to a water-resistant instant adhesive and a preparation method thereof. The invention provides water-resistant instant glue, which is prepared from the following raw materials in parts by mass: 90 to 95 parts of alpha-cyanoacrylate; 3 to 8 parts of a polyacrylate toughening agent; 0.02 to 0.08 part of hydroquinone; 1 to 3 parts of methacryloyloxypropyl double-terminated polydimethylsiloxane; and 0.1 to 0.3 part of triethanolamine phosphate. The invention aims to solve the technical problems that polydimethylsiloxane is favorable for improving the water resistance of the instant glue, but the adhesion speed of the prepared instant glue is slow, and the adhesion strength is severely reduced.