87 results about "P-Hydroquinone" patented technology

The invention discloses a mechanically interlocked isohydrocarbon-like structure hydrogel and a preparation method thereof, and belongs to the technical field of hydrogel sensing. The preparation method of the mechanically-interlocked isohydrocarbon-like structure hydrogel comprises the following steps: firstly, preparing a carbon nano network solution by using hydroquinone; and then mixing the carbon nano network solution, acrylamide, water, a cross-linking agent and a photoinitiator, and treating under ultraviolet irradiation to obtain the hydrogel. The preparation method comprises the following steps: introducing a three-dimensional carbon nano network, blending the three-dimensional carbon nano network with an acrylamide monomer, and carrying out in-situ free radical polymerization to construct the mechanical interlocking isohydrocarbon-like structure hydrogel. The carbon nano network provides a continuous porous framework, a polyacrylamide chain segment is embedded into pores of the carbon nano network in the polymerization process, and a stable isohydrocarbon-like structure is formed through physical winding, space nesting and mechanical interlocking. The prepared hydrogel has excellent mechanical property, adhesion property and strain response capability, and provides a reliable and economical material basis for a flexible strain sensing function.

The invention discloses a tubular continuous flow preparation process and a tubular continuous flow preparation device for (R)-(+)-2-(4-hydroxyphenoxy) propionic acid. A hydroquinone aqueous solution and a sodium hydroxide solution are respectively preheated and mixed, and then enter a tubular reactor I for reaction to obtain a hydroquinone sodium alkaline solution. And pumping (S)-(-)-2-methyl chloropropionate into a reaction system, respectively preheating the (S)-(-)-2-methyl chloropropionate and the hydroquinone sodium alkaline solution obtained in the previous step, mixing the (S)-(-)-2-methyl chloropropionate and the hydroquinone sodium alkaline solution, carrying out nucleophilic substitution reaction in a tubular reactor II, and carrying out post-treatment on the reaction completion solution to obtain the high-purity (R)-(+)-2-(4-hydroxyphenoxy) propionic acid. According to the method, an optimization method combining a tubular reaction technology and kinetic research is adopted, and MATLAB simulation and experimental verification are combined, so that the reaction yield reaches 95% or above, and the purity reaches 99% or above; the method is high in reaction controllability, fully continuous in reaction process, convenient to operate, low in cost and suitable for industrial production, and the use amount of hydroquinone is greatly reduced.

The invention provides a silver substrate and a preparation method and application thereof.The preparation method comprises the steps that firstly, dispersed silver seeds are introduced to the surface of an aluminum-foil paper substrate through the reaction of silver nitrate and excessive alkali, and in-situ nucleation sites are provided for follow-up silver growth; and then, through in-situ reduction reaction of hydroquinone and silver nitrate, silver controllably grows on the basis of the silver seeds to form a structure rich in hot spots. Conventional raw materials such as aluminum foil, silver nitrate, alkali and hydroquinone are adopted in the whole process, complex equipment is not needed, and therefore the process is simple and low in cost; meanwhile, a step-by-step regulation and control mechanism ensures that a large number of'hot spots' formed by nano-structure gaps and tips are formed on the surface of the silver substrate, and the key structure can obviously enhance Raman signals, so that the high-sensitivity detection requirement is met. In conclusion, the method has the advantages of preparation convenience, cost and high performance of the product, a practical substrate which is easy to popularize and high in adaptability is provided for the field of surface enhanced Raman spectrum detection, and the method has remarkable application value.

The invention discloses a method for synthesizing alpha-arbutin through biotransformation, and belongs to the technical field of biochemistry. A gene cloning technology is utilized, sucrose phosphorylase Spase in leuconostoc mesenteroides and sucrose phosphorylase gtfa in bifidobacterium adolescentis are screened and found through a Deep Molecules and DLKcat algorithm on a Uniprot database, novopro is utilized for codon optimization, then the sucrose phosphorylase Spase and the sucrose phosphorylase gtfa are expressed on a plasmid vector PET-28a and are converted into an escherichia coli BL21 (DE3) strain, and the sucrose phosphorylase Spase and the sucrose phosphorylase gtfa in the bifidobacterium adolescentis are obtained. An engineering strain for heterologous expression of the gene is constructed by taking the gene as a chassis cell. According to the process, sucrose and hydroquinone are taken as co-substrates, and bioconversion is carried out under the action of sucrose phosphorylase from different sources to obtain alpha-arbutin.

A method for electrochemiluminescence detection of hydroquinone based on aggregation-induced emission Cd-MOF is provided, including: step 1, preparation of Cd-MOF material; step 2, mixing Cd-MOF material with co-reactant; and step 3, establishment and application of hydroquinone sensor. The organic ligand TPPE with aggregation-induced emission effect and CdCl2 are used to prepare self-luminous Cd-based metal-organic framework Cd-MOF with rigid and directional structure through coordination.

The application discloses a brazing flux capable of enhancing the radiation resistance of aluminum alloy brazing joints, and a preparation method and application thereof. The brazing flux is composed of 5-18% of an organic mixture and the balance of an inorganic mixture. The organic mixture is composed of 7-15% of EP-12 epoxy resin, 8-16% of EP-16 epoxy resin, 5-8% of F-51A high-temperature-resistant flame-retardant thermosetting phenolic resin, 5-8% of F-52A high-temperature-resistant flame-retardant thermosetting phenolic resin, 5-8% of resorcinol, 5-8% of hydroquinone and the balance of phthalic anhydride. The inorganic mixture is composed of 40-55% of CsF, 20-30% of AlF3, 0.005-0.01% of GaF3 and the balance of Al(OH)3. The brazing flux matches Zn-Al filler metal, can make the aluminum alloy brazing joint have good radiation resistance, and can significantly improve the shearing strength of the brazing joint.

The invention discloses an amylosucrase mutant and application thereof in synthesis of alpha-arbutin, the mutant is obtained by mutation of an amino acid sequence of amylosucrase derived from coprophilobacterium mediterranei, and the amino acid sequence of the mutant is shown as SEQ ID NO.4. The invention further discloses a preparation method of the amylosucrase mutant. Compared with a wild strain, the catalytic activity, the temperature stability and the substrate tolerance of the amylosucrase mutant disclosed by the invention are remarkably improved; the recombinant bacteria constructed by using the recombinant bacteria can be used as a whole-cell catalyst to efficiently catalyze a substrate to synthesize alpha-arbutin in a reaction system containing hydroquinone. Therefore, the amylosucrase mutant disclosed by the invention has a good application prospect.

The invention provides an oocyte in-vitro maturation culture solution additive and application thereof. The additive is tert-butylhydroquinone. By adding 100 [mu] g / mL of TBHQ into a basic culture solution, the first polar body discharge rate of oocytes is remarkably increased to 77.29%, the ROS level is reduced, and the blastocyst rate of in-vitro fertilized embryos is increased. The technology is suitable for breed conservation of livestock genetic resources such as sheep and can replace live livestock transportation to reduce the cost.

The application discloses application of a composition in preparation of sleep-improving preparations, and the composition comprises tert-butyl hydroquinone and linoleic acid. It is found by the application that neither the tert-butyl hydroquinone nor the linoleic acid can improve sleep alone, but the combination of the tert-butyl hydroquinone and the linoleic acid can improve sleep, increase total sleep time and single sleep time, and reduce the number of night awakenings and the number of night spontaneous activities. The composition of the application is safe and easy to obtain, has a good sleep-improving effect, and has a wide application prospect.

The invention relates to the technical field of medical suturing agents, and discloses a medical suturing agent for trauma and surgery and a preparation method thereof.The preparation method comprises the steps that 80 g of alpha-cyanoacrylate isobutyl ester, 0.4 g of acrylonitrile-butadiene rubber, 0.2 g of p-toluene sulfonic acid, 2 mg of hydroquinone and 20 mg of tert-butyl hydroxy anisd are weighed and evenly mixed in a 500 ml three-necked bottle; and adding the alpha-ethyl cyanoacrylate to 100g, stirring until the solution is clear and transparent, setting the filling amount of the medical suture agent to be 0.5 ml / bottle, aseptically filling the medical suture agent into a 1ml ampoule bottle, and carrying out lamp inspection, lettering and packaging to obtain a finished product. The medical suture agent disclosed by the invention is used for anastomosis of wounds in trauma and surgical operations, has the advantages of good stability, high bonding strength, high anastomosis speed, no whitening, good toughness, high yield, no toxicity, in-vivo degradation and no three causes, and has certain functions of stopping bleeding, relieving pain and inhibiting bacteria.

This invention relates to the field of polymer material processing technology, specifically to an impact-resistant, high-transparency acrylic sheet and its extrusion and calendering equipment and process, comprising the following components in parts by weight: 80-85 parts methyl methacrylate; 0.07-0.09 parts azobisisobutyronitrile; 0.001 parts hydroquinone; and 15-20 parts toughening masterbatch. The particle size of the toughening masterbatch is 2.0 mm to 2.5 mm, and the particle size difference between the polymethyl methacrylate particles and the toughening masterbatch is 0.2 mm to 0.5 mm. By combining a specific composite toughening masterbatch formula with precisely controlled particle size distribution, it can effectively resist the impact of door closing and object bumps, ensuring the structural integrity and durability of the components. The haze is ≤0.45%, which meets the stringent requirements for the "high-end" and transparent appearance of decorative parts such as A-pillars and trim strips, avoiding visual blurring caused by toughening.

The present disclosure relates to a body-derived odor removal composition. The composition for removing body-derived odors according to the present disclosure contains dimethylhydroquinone as an active ingredient, and thus has significantly excellent effects of removing body-derived odors, preferably body odors caused by nonenal, isovaleric acid, diacetyl, and the like.

The application belongs to the technical field of lubricants, and provides a polyurethane lubricant, a preparation method and application thereof.The polyurethane lubricant provided by the application comprises the following components in percentage by weight: 8-20% of a polyurethane thickening agent, 80-90% of base oil, 1.5-3.5% of an antioxidant, 0.5-2.0% of extreme pressure anti-wear agent, and 0.1-1.5% of lubricant; the polyurethane thickening agent is formed by polycondensation reaction of 4,4'-dicyclohexyl methane diisocyanate (HMDI), polybutylene adipate (PBA) and hydroquinone di(2-hydroxyethyl) ether (HQEE). The polyurethane lubricant provided by the application has excellent high-temperature stability, wide temperature range performance, and extremely high load-carrying and wear resistance.

The invention belongs to the technical field of degradation modification of epoxy resin materials, and particularly relates to epoxy resin capable of being degraded in an acidic environment and a preparation method and application of the epoxy resin capable of being degraded in the acidic environment, and the epoxy resin capable of being degraded in the acidic environment is prepared from 2, 6-dialkoxy p-phenylenedioxy, 2-hydroxy-1, 3-propylidene and cross-linked 4, 6-dialkoxy p-phenylenedioxy, 2-hydroxy-1, 3-propylidene. The preparation method comprises the following steps: reacting 2, 6-dialkoxy hydroquinone monomers with epoxy chloropropane monomers to synthesize an epoxy resin prepolymer, and then cross-linking and curing the prepolymer by using a diphenylamine curing agent, thereby obtaining the pH-responsive dynamic covalent network containing C-O polar weak bonds, which is composed of 2, 6-dialkoxy hydroquinone units and 4, 4 '-subunit diphenyl nitrogen units. According to the 2, 6-dialkoxy hydroquinone epoxy resin prepared by the preparation method disclosed by the invention, mechanical, thermal and electrical properties of hydroquinone epoxy resin are retained, and meanwhile, the hydroquinone epoxy resin is internally degradable, so that sustainable development of the relationship between an epoxy resin material and the environment is effectively promoted.

The application provides a kind of toughening polyether ether ketone material based on block copolymer and a preparation method thereof, relates to the technical field of polymer materials, and the method is by accurately controlling the ternary block copolymerization of hydroquinone, 4,4'-difluorobenzophenone and diphenylol, to synthesize the block copolymer PAEK-B with specific sequence structure, then melt blend it with PEEK, effectively improve the toughness of PEEK, improve the mechanical properties, while keeping the original processing temperature unchanged.

The invention discloses an amylosucrase mutant and application thereof in synthesis of alpha-arbutin, and belongs to the technical field of genetic engineering. An amylosucrase mutant is obtained through an error-prone PCR technology, the mutant is obtained by mutation on an amylosucrase amino acid sequence derived from coprophilobacterium mediterranei, and the amino acid sequence of the amylosucrase mutant is shown as SEQ ID NO.4. The invention further discloses a preparation method of the amylosucrase mutant. Compared with a wild strain, the amylosucrase mutant disclosed by the invention has higher catalytic activity, temperature stability and substrate tolerance; when the catalyst is added into a hydroquinone-containing reaction system, alpha-arbutin can be efficiently catalyzed and synthesized. Therefore, the amylosucrase mutant disclosed by the invention is suitable for industrial production and has a good application prospect.

The application provides a non-inducible engineering strain for producing alpha-matrix and a construction method and application thereof. The engineering strain of the application is a recombinant Escherichia coli, which contains an expression regulatory element and a sucrose phosphorylase gene, and the expression regulatory element includes a PgapA-infC tandem promoter, a Plpp-infC tandem promoter or a PalsR-infC tandem promoter. The engineering strain can greatly shorten the protein expression period without adding an inducer, and the bacterial body after fermentation culture is ended is used as a whole cell catalyst to synthesize alpha-matrix by glycosylation reaction of a substrate hydroquinone and a sugar donor (such as sucrose), and the molar conversion rate of the substrate hydroquinone is high, and the engineering strain has an industrial application prospect.

The invention provides an adhesive and a film bearing system for multi-omics testing. The adhesive is prepared from 50 to 70 parts by mass of methyl methacrylate, 5 to 20 parts by mass of methacrylic acid, 0.01 to 0.1 part by mass of hydroquinone, 0.5 to 1 part by mass of ethylene glycol, 15 to 30 parts by mass of a toughening agent and 1 to 3 parts by mass of an initiator. Methyl methacrylate and methacrylic acid are used as main components of the adhesive, so that excellent adhesion performance and chemical stability are provided, and meanwhile, the adhesive has a good high-temperature-resistant characteristic. The hydroquinone is used as an antioxidant and can prevent oxygenolysis under a high-temperature condition. The addition of ethylene glycol enhances the fluidity of the adhesive, the use of the flexibilizer improves the flexibility and impact resistance of the adhesive layer, and the addition of the initiator initiates monomer polymerization. The adhesive can effectively cope with organic reagents and high-temperature conditions, and stable adhesion between a supporting film and a film bearing frame is guaranteed.

The invention relates to the technical field of reinforcing materials, in particular to a reactive mining low-temperature reinforcing material and a preparation method and application thereof. The reactive mining low-temperature reinforcing material is composed of a component A and a component B. The component A comprises polyester polyol, polyether polyol, a silane coupling agent and a catalyst. The component B comprises a prepolymer and an auxiliary agent; the prepolymer is obtained by carrying out a reaction on polyether polyol b and polymethylene polyphenyl polyisocyanate; the functionality of the polyether polyol b is 3.1, the hydroxyl value of the polyether polyol b is 207 mgKOH / g, and the polyether polyol b is formed by taking maltitol, trimethylolpropane, hydroquinone and triethylene glycol as initiators and polymerizing the initiators with epoxypropane. The material prepared by the invention mainly adopts a reactive structure flame retardant, so that the influence of addition of a large amount of additive flame retardants on the strength of the material is avoided, and the prepared material is high in compressive strength, low in internal reaction heat and good in flame retardant property.

The invention relates to the technical field of paper ink, and discloses polyester-based decorative paper ink and a preparation method thereof.The preparation method comprises the following steps that S1, ramie fibers are pretreated; s3, in a nitrogen atmosphere, adding itaconic acid, phthalic anhydride and 1, 6-hexanediol into a reactor, stirring and mixing, continuously adding p-toluenesulfonic acid and hydroquinone, ending the reaction until no water is generated, then adding dibutyltin dilaurate, and carrying out reduced pressure reaction to obtain unsaturated polyester; s4, adding unsaturated polyester, the modified ramie fiber and hydrogen-containing silicone oil into a reactor, stirring and mixing, adding a platinum catalyst, and reacting to obtain a polyester-based intermediate; and S5, adding water-based acrylic resin, the polyester-based intermediate, a flatting agent and a dispersing agent into the reactor, and stirring to obtain the polyester-based decorative paper ink. The polyester-based decorative paper ink provided by the invention has good adhesive force, water resistance and wear resistance.

The invention discloses a preparation process of industrial-grade o-methylhydroquinone, and relates to the technical field of production of o-methylhydroquinone, o-cresol, a supported palladium-copper bimetallic catalyst, potassium carbonate and a solvent are added into a reaction kettle, oxygen is introduced for a reaction, a reaction liquid is cooled, hydrogenation reduction is performed, crystallization is performed, and an o-methylhydroquinone product is obtained. The method is high in yield and environment-friendly, and the production cost is reduced.

The invention relates to a high-adhesion anti-stripping primer special for a metal substrate and a preparation method thereof, and belongs to the technical field of paints.The primer comprises silane modified phosphoramidate chelating resin, graphite oxide-Schiff base zirconium-siloxane hybrid filler, a hyperbranched polyamide-siloxane bonding accelerant, an isocyanate curing agent, functional auxiliaries and the like. The silane modified phosphoramidate chelating resin is prepared by carrying out a reaction on bisphenol F epoxy resin and diethylenetriamine, and carrying out a reaction on p-toluenesulfonic acid, diethyl phosphite, KH540 and hydroquinone. The graphite oxide-Schiff base zirconium-siloxane hybrid filler is prepared from the following components: GO-SB, ZrO2-siloxane core-shell particles, zirconium n-propoxide and the like. The hyperbranched polyamide-siloxane bonding accelerator is prepared by the following steps: reacting ethylenediamine with methyl acrylate, then reacting with ethylenediamine, and then modifying with KH540 and perfluoroalkyl phosphate. The problems that a traditional primer is weak in interface bonding force, easy to peel off and insufficient in corrosion resistance are solved.

The invention discloses end-capped polyether-ether-ketone and a preparation method thereof.The preparation method comprises the following steps that hydroquinone, a salt-forming agent and a solvent are mixed to be subjected to a salt-forming reaction, and hydroquinone salt is obtained; 4, 4-difluorobenzophenone is added into the hydroquinone salt for a polymerization reaction, and after the polymerization reaction is carried out for a period of time, a fluorine-containing end-capping reagent is added for continuous reaction for a period of time; and after the reaction is finished, cooling and crushing a reaction product, washing with an organic solvent and water respectively, and drying to obtain the terminated polyether-ether-ketone. According to the preparation method disclosed by the invention, the molecular weight range of the prepared polyether-ether-ketone can be effectively controlled by adopting a polymerization method of salification, polymerization and end capping, and meanwhile, the prepared end-capped polyether-ether-ketone is low in branching degree and has excellent thermal stability.

The present application relates to a medical adhesive and a preparation method therefor. Starting materials for preparing the medical adhesive comprise the following in parts by mass: 60-90 parts of cyanoacrylate, 5-30 parts of a plasticizer, 0-7 parts of acrylate rubber, 0.05-0.08 parts of polyoxyethylene hydrogenated castor oil, and 0.02-0.04 parts of hydroquinone.

The invention belongs to the technical field of textile assistants, and particularly relates to a scouring and dyeing one-bath assistant for a polyester rapid heating process as well as a preparation method and application of the scouring and dyeing one-bath assistant. The scouring and dyeing one-bath auxiliary agent for the polyester rapid heating process comprises the following raw materials: phenol, styrene, benzyl chloride, ethylene oxide, p-toluenesulfonic acid, hydroquinone, potassium hydroxide, fatty alcohol-polyoxyethylene ether, sodium dodecyl benzene sulfonate, ethylene glycol butyl ether and water. The auxiliary agent provided by the invention has excellent migration and retarding functions and high-temperature dispersibility, and can effectively prevent the problems of color marks and color difference, especially sensitive yarn-dyed fabrics.

The application belongs to the technical field of polytetrafluoroethylene pipe preparation, and particularly relates to a polytetrafluoroethylene hose and a preparation process thereof, which comprises the following steps: mixing modified polytetrafluoroethylene particles, perfluoroalkoxy resin and a first conductive agent, and then feeding the mixture into an extruder to extrude a pipe embryo; adding methanol and octenyl trimethylsilane into a sodium hydroxide solution, stirring, adding glacial acetic acid, stirring, obtaining a modified solution, immersing the pipe embryo in the modified solution, reacting, taking out, washing, drying, cooling, and obtaining a modified pipe embryo; coating the modified pipe embryo with conductive glue, and performing heating and curing treatment on the conductive glue to obtain a polytetrafluoroethylene hose; mixing and stirring methyl methacrylate, 2-hydroxyethyl acrylate, dipropylene glycol butyl ether and hydroquinone, adding a second conductive agent and an initiator, and stirring uniformly to obtain conductive glue. The application can shorten the charge migration path, accelerate the charge leading-out speed, avoid the accumulation of charges on the pipeline, and maintain production safety.

The application relates to the technical field of genetic engineering, in particular to a sucrose phosphorylase mutant and application thereof in synthesis of alpha-maronia. Streptococcus parasanguinis The application is characterized in that the histidine at the 152th position of the wild-type sucrose phosphorylase from Streptococcus sanguis is mutated into threonine, and the isoleucine at the 336th position is mutated into proline, so that the sucrose phosphorylase mutant is obtained, the catalytic activity and stability of the sucrose phosphorylase are significantly improved. When sucrose and hydroquinone are used as substrates, the yield of alpha-maronia is increased by more than 40% compared with the wild type, and the catalytic reaction time can be greatly shortened.

The invention provides high-performance polyether-ether-ketone and a preparation method thereof.The method comprises the steps that hydroquinone, potassium carbonate and 1, 3-dimethyl-2-imidazolinone are added, nitrogen is introduced, the temperature is raised, and stirring reaction is conducted after temperature raising; adding 4, 4 '-difluorobenzophenone, keeping the temperature, and continuously stirring for reaction; 2-isopropenyl-2-oxazoline is added under the nitrogen atmosphere, the stirring rotating speed is adjusted, and a reaction is conducted; controlling the temperature gradient field of the amido bond chain-extended PEEK tackifying melt through a temperature control program to treat the amido bond chain-extended PEEK tackifying melt; transferring into an ice-water mixture, and slowly stirring; and transferring into absolute ethyl alcohol, heating, carrying out reflux washing, transferring into distilled water, cleaning, and drying to obtain the high-performance polyether-ether-ketone. Accurate end group functionalization is directly carried out in a molten state after polymerization is completed, the reaction activity of the tail end of a polymer chain is efficiently activated, a solid foundation is laid for subsequent molecular chain extension, and the problems that in a traditional method, the end group utilization rate is low, and effective chain extension is difficult to achieve are fundamentally solved.

The invention relates to the technical field of gene engineering, in particular to a sucrose phosphorylase mutant and application thereof in alpha-arbutin synthesis. Specifically, a sucrose phosphorylase mutant is obtained by simultaneously mutating multiple sites of amino acids at the 13th site, the 206th site and the 243rd site of wild sucrose phosphorylase derived from streptococcus parahaemolyticus, recombinant escherichia coli is constructed, and the recombinant sucrose phosphorylase is produced by fermentation of the recombinant escherichia coli. According to the present invention, the efficiency of the alpha-arbutin production using sucrose and hydroquinone as the raw materials is significantly improved, and the test results show that the conversion rate of the alpha-arbutin production using sucrose and hydroquinone as the raw materials can achieve 90%, and the product concentration achieves 123 g / L, such that the strong industrial application potential is provided.

The present invention discloses a carbon dot synthesized at room temperature and its application in H₂O₂ detection. The carbon dot uses o-phenylenediamine and hydroquinone as precursor raw materials, and iron salt acts as a catalytic reagent and doping element, and is prepared at room temperature by means of oxidation / polymerization and Schiff base reaction. The carbon dot not only has excellent fluorescence properties, but also its preparation process does not require high-energy consumption steps such as high-temperature carbonization, nor does it require the intervention of strong acids, strong bases or oxidants, and has the advantages of energy saving, safe operation and cheap and readily available raw materials. There is no need to introduce complex enzyme-catalyzed reactions or additional co-reactants, and the fluorescence of the carbon dot can be significantly quenched by H₂O₂, thereby achieving direct fluorescence detection of H₂O₂, which has the characteristics of high sensitivity, good selectivity and rapid response. The present invention is of great significance to alleviating environmental pollution, reducing production costs, promoting large-scale production, and promoting the application of carbon dots in multiple fields.