101 results about "Hydroquinol" patented technology

The invention discloses a method for detecting antioxidants and polyphenols in food by constructing a colorimetric sensing array based on monatomic iron nano-enzyme, and belongs to the field of nanotechnology and colorimetric sensing. The traditional monatomic nano enzyme shows limited enzyme-like activity and substrate specificity, and is difficult to meet the comprehensive requirements of detecting various antioxidants and polyphenols in food. In the research, a novel nano-enzyme system (sdsFeN (at) G) of monatomic iron nano-enzyme is developed. The SdsFeN (at) G shows excellent enzymatic activity, and a three-channel colorimetric sensing array is constructed by utilizing inhibition of different antioxidants and polyphenols on oxidation of three chromogenic substrates, so that simple, convenient and reliable identification and detection of five substances (tert-butylhydroquinone, butylated hydroxyanisole, propyl gallate, catechol and hydroquinone) in food are realized.

The invention relates to the technical field of silicone rubber, in particular to high-temperature-resistant flame-retardant silicone rubber, a preparation method thereof and a cable, the high-temperature-resistant flame-retardant silicone rubber comprises a gradient layer material composed of a surface layer material, a transition layer material and a core layer material, and the surface layer material comprises methyl vinyl silicone rubber, superfine furnace black, calcium stannate, polyacrylonitrile aerogel and a flame-retardant premix; the transition layer material comprises methyl vinyl silicone rubber, superfine furnace carbon black, spandex fibers, polyarylester, calcium stannate and a flame-retardant premix; the core layer material is prepared from methyl vinyl silicone rubber, superfine furnace black, aramid fiber, polyarylester, phthalonitrile resin and 2-mercaptobenzothiazole zinc salt; wherein the flame-retardant premix is prepared from hydroquinone bis (diphenyl) phosphate, phenyl ethyl aluminum phosphinate and zinc hypophosphite according to the weight ratio of (6 to 10): (2 to 4): (1 to 3); the problems that an existing material is prone to aging in an extreme environment, the flame retardant effect is poor, and the mechanical property is degraded are effectively solved.

The invention relates to a phenol hydroxylation reaction liquid separation and purification method, which comprises: dehydrating a phenol hydroxylation reaction liquid, and carrying out decoking to reduce the operation temperature of subsequent separation so as to obtain a first material; carrying out vacuum rectification on the first material through a dephenolization tower to obtain a second material; wherein the dephenolization tower comprises a first dephenolization tower and a second dephenolization tower, the second dephenolization tower and the first dephenolization tower are thermally integrated, tower top steam of the second dephenolization tower is used as a reboiler heat source of the first dephenolization tower, and meanwhile, tower top steam of the second dephenolization tower is condensed; the tower top operation pressure of the second dephenolization tower is higher than that of the first dephenolization tower; and separating the second material to obtain catechol and hydroquinone. The technical problem that the benzenediol product yield and the separation energy consumption are difficult to balance in an existing phenol hydroxylation reaction liquid separation system is solved.

The invention discloses a self-expanding water shutoff material for tunnels and a preparation method of the self-expanding water shutoff material, and belongs to the field of polymer composite materials. Modified polyurethane in the self-expanding water shutoff material is prepared through vacuum dehydration of polyether glycol, chain extension of diisocyanate, reaction of a carboxyl-containing chain extender and acetone, dropwise addition and grafting of nano silicon dioxide dispersion liquid, neutralization of triethylamine and reduced pressure distillation. The modified epoxy acrylate is prepared by mixing epoxy resin and methyl methacrylate, stirring a silane coupling agent and an absolute ethyl alcohol solution, initiating polymerization by benzoyl peroxide, dropwise adding nano-montmorillonite dispersion liquid for reaction, stirring acrylic acid and a polymerization inhibitor hydroquinone, and performing reduced pressure treatment. The material formula comprises the two modified macromolecules, super absorbent resin, a filler, a plasticizer, an initiator, a cross-linking agent, a defoaming agent and deionized water. The prepared material has the advantages of high expansion rate, excellent water resistance, strong adhesive property and controllable curing time, and is suitable for the scenes of tunnel water inrush plugging, lining crack repairing, water-rich fault zone advanced grouting and the like.

The invention provides a block copolymer toughening-based polyether-ether-ketone material and a preparation method thereof, and relates to the technical field of high polymer materials, the method is characterized in that a block copolymer PAEK-B with a specific sequence structure is synthesized by accurately controlling a ternary block copolymerization reaction of hydroquinone, 4, 4 '-difluorobenzophenone and biphenol, and the block copolymer PAEK-B with a specific sequence structure is obtained. And then the mixture is subjected to melt blending with PEEK, so that the toughness of the PEEK is effectively improved, the mechanical property is improved, and meanwhile, the original processing temperature is kept unchanged.

The invention relates to the technical field of non-woven materials, in particular to a polyether-ether-ketone resin special material for melt-blown non-woven fabric, a preparation method of the polyether-ether-ketone resin special material, the melt-blown non-woven fabric and a manufacturing method of the melt-blown non-woven fabric. The preparation method of the special material for the polyether-ether-ketone resin comprises the following steps: in an inert gas atmosphere, heating a first mixture obtained by mixing 4, 4 '-difluorobenzophenone and dimethylacetamide to a first temperature to obtain a first mixture at the first temperature; sequentially adding alkali carbonate and hydroquinone into the first mixture at the first temperature, then performing sectional heating treatment, and performing washing treatment to obtain polyether-ether-ketone resin; the polyether-ether-ketone resin is placed in a screw extruder to be subjected to melt extrusion granulation, and the polyether-ether-ketone resin is obtained after filtering treatment. The polyether-ether-ketone resin special material with ultrahigh melt flowability and low apparent viscosity can be prepared by the method provided by the invention, and can meet the requirements of manufacturing melt-blown non-woven fabrics.

The invention provides a preparation method of polyaryletherketone resin for a 3D printing material, and relates to the technical field of high polymer materials, the polyaryletherketone resin is prepared by taking 4, 4-difluorobenzophenone, hydroquinone, biphenol and bisphenol fluorene as reaction raw materials, taking diphenyl sulfone as a solvent and taking carbonate of alkali metal as a catalyst through nucleophilic polycondensation reaction; the material has the advantages of high melting point, high glass transition temperature, high thermal decomposition temperature and low crystallization speed. According to the preparation method provided by the invention, a certain amount of bisphenol fluorene is added at the later stage of a polymerization reaction, so that on one hand, the introduction of a fluorenyl structure can further destroy the regularity of a molecular chain and reduce the crystallinity and the crystallization speed; on the other hand, the fluorenyl structure can be used for hindering chain segment movement, and the resin melting point can be increased.

The utility model provides an energy-saving device for separating and purifying materials after hydroxylation reaction of phenol and hydrogen peroxide, and relates to the technical field of chemical synthesis. Materials obtained after phenol hydrogen peroxide hydroxylation reaction are separated and purified through the extraction tower, the extraction agent recovery tower, the first phenol removal tower, the tar removal tower, the second phenol removal tower, the catechol removal tower, the light component removal tower and the hydroquinone tower, the whole technological process is simple, the yield is high, and the high-purity hydroquinone product and the high-purity catechol product can be obtained; according to the utility model, the extraction tower is adopted to replace a dehydration rectifying tower in the traditional process to remove phenol-containing wastewater, so that the phenol recovery rate is improved, and the subsequent wastewater treatment burden is reduced; and the tar removal tower is arranged behind the phenol removal tower I, so that the retention time of tar impurities in the whole process system is shortened, and the process safety is improved. According to the utility model, the high-temperature waste heat at the top of the dephenolization tower I is recovered by combining waste heat recovery with a mechanical steam recompression energy-saving technology, so that the process energy consumption of the operation of the whole device is effectively reduced.

The invention discloses an antibacterial and mildew-proof coating putty material and a preparation method, and belongs to the field of putty materials. The antibacterial and mildew-proof coating putty material is prepared from the following raw materials in parts by weight: 80 to 100 parts of putty powder, 7 to 20 parts of copper-based antibacterial and mildew-proof powder, 6 to 9 parts of reinforcing agent, 15 to 25 parts of binder, 0.3 to 1.2 parts of dispersing agent, 3 to 4 parts of thickening agent, 35 to 60 parts of water and 18 to 23 parts of antioxidant compound. The copper-based antibacterial and mildew-proof powder cooperates with the nano-zinc oxide to broaden the antibacterial spectrum of the antibacterial and mildew-proof coating putty material, hydrogen atoms are provided and oxidation reaction is blocked on the basis of addition of the antioxidant compound and setting of the tert-butylhydroquinone, and the effect of the tert-butylhydroquinone is enhanced through the synergistic effect of the rosemary extract, so that the antibacterial and mildew-proof coating putty material has a good antibacterial and mildew-proof effect. Due to the addition of phytic acid, the oxidation of copper ions is reduced, so that the oxidation of copper ions in the antibacterial and mildew-proof coating putty material is inhibited.

The present invention discloses a high-efficiency demulsifier for oily sludge and a preparation method thereof, belonging to the technical field of sludge treatment. Octylphenol polyoxyethylene ether is dissolved in water, stirred and then transferred to a flask. The temperature is raised to 60 °C, and an aqueous solution of peroxide is added. Under nitrogen protection, the temperature is raised to 80 °C, and methyl methacrylate, butyl acrylate and an auxiliary agent are added. After maintaining the temperature for 30-60 minutes, the temperature is lowered to 60 °C, and an aqueous solution of hydroquinone is added. After maintaining the temperature for 30 minutes, a primary demulsifier is obtained; the primary demulsifier, sodium silicate and water are stirred to prepare a high-efficiency demulsifier for oily sludge; there is a chemical interaction between the auxiliary agent containing a quaternary ammonium salt structure and methyl methacrylate and butyl acrylate, and graft crosslinking occurs, and then they act synergistically to jointly improve the demulsification effect of the demulsifier. In addition, due to the combined action of raw materials such as the non-ionic demulsifier - octylphenol polyoxyethylene ether, the inorganic demulsifier - sodium silicate and hydroquinone, the demulsifier for sludge in the present invention has an efficient and stable demulsification effect.

The invention discloses an impact-resistant toughened polystyrene sheet, and belongs to the technical field of high polymer material preparation, the impact-resistant toughened polystyrene sheet comprises polystyrene resin and surface modified fibers, the surface modified fibers are prepared by taking polyphenol hydroxyl benzophenanthrene as a cross-linking agent and a modifying agent, difluorobenzophenone and hydroquinone as monomers, and a cross-linking agent, a cross-linking agent, a cross-linking agent, a cross-linking agent, a cross-linking agent, a cross-linking agent, a cross-linking agent, a cross-linking agent and a cross-linking agent; a cross-linking polymerization product with polyphenyl ether ketone as a main body polymerization chain is generated on the surface of the reinforced fiber in situ; by adding the surface modified fiber, the interfacial effect between the fiber and polystyrene resin is reduced, and the mechanical strength and impact toughness of the polystyrene material are effectively improved.

The present invention provides a method for preparing a highly transparent and highly flexible modified polylactic acid, and relates to the technical field of organic polymer compounds. A method for preparing a highly transparent and highly flexible modified polylactic acid includes the steps of preparing a PLA-co-PVL copolymer solution, purifying the PLA-co-PVL copolymer, synthesizing an ATEC-HEA complex, and obtaining a modified polylactic acid composite material; the preparation of the PLA-co-PVL copolymer solution comprises the steps of uniformly mixing L-lactide and δ-valerolactone to obtain a mixed solution, adding a catalyst and an initiator to the mixed solution, and reacting to obtain a PLA-co-PVL copolymer solution; the catalyst is Sn(Oct)2, and the initiator is 1,4-butanediol; the synthesis of the ATEC-HEA complex comprises raw materials including acetyl citrate triethyl, hydroxyethyl acrylate, p-toluenesulfonic acid, and hydroquinone; the preparation of the modified polylactic acid composite material comprises raw materials including a PLA-co-PVL solid copolymer, an ATEC-HEA complex, and an antioxidant. The modified polylactic acid of the present invention has high light transmittance and excellent flexibility.

The invention discloses a surface strengthening treatment method for an inner hole of a main connecting rod of a piston type aero-engine. The surface strengthening treatment method comprises the following steps that S100, the main connecting rod is subjected to oil removal treatment; s200, performing waxing treatment on the non-plated surface on the main connecting rod to form an insulating protection layer; s300, weak corrosion activation treatment is conducted on an inner hole of the main connecting rod; s400, a tool clamp is used for installing and hanging the main connecting rod, then a lead and tin plating solution is poured into an inner hole of the main connecting rod for out-groove electroplating treatment, and the lead and tin plating solution comprises 110 g / L to 275 g / L of lead fluoroborate, 30 g / L to 65 g / L of stannous fluoroborate, 1 g / L to 2 g / L of hydroquinone and 1.5 g / L to 2.0 g / L of oxhide gelatin; and S500, the main connecting rod is detached from the tool clamp and then subjected to wax removal and cleaning treatment, and then whether the lead-tin layer is qualified or not is checked. According to the surface strengthening treatment method for the inner hole of the main connecting rod of the piston type aero-engine, the uniformity of a plating layer can be improved, the tin content in a lead-tin layer is increased, and the wear-resisting and lubricating capacity is enhanced.

This invention discloses an anionic hydroxyl silicone oil emulsion and its preparation method, relating to the field of polysiloxane emulsion technology, and belonging to patent classification number C08G77 / 04. The preparation method is as follows: Triethanolamine dodecylbenzenesulfonate salt, tridecyl alcohol polyether, and deionized water are mixed and dissolved, heated, and polydimethylsiloxane alcohol is added under high-speed shearing for homogenization. Water is added and the reaction is maintained at a constant temperature to obtain a basic emulsion. γ-(methacryloyloxy)propyltrimethoxysilane is added dropwise to react and obtain an interface-reinforced emulsion. Acrylamide, N-hydroxymethylacrylamide, etc., are pre-emulsified and then added to the interface-reinforced emulsion with ammonium persulfate under nitrogen protection. Polymerization forms a cross-linked polymer shell. After cooling, tert-butylhydroquinone and disodium ethylenediaminetetraacetate are added to obtain an antioxidant emulsion. Phenoxyethanol and octyl glycol are added to obtain the final emulsion. This method significantly improves the thermal stability of the emulsion through the synergistic effects of composite emulsification, interface reinforcement, shell protection, and antioxidant properties, making it suitable for high-temperature environments.

The present application discloses a method for preparing biodiesel using lipase catalysis, which relates to the field of biodiesel. The biodiesel enzymatic reaction process comprises: raw oil pretreatment, enzymatic transesterification reaction, acid reduction treatment, and fatty acid salt modification. The acid reduction treatment step comprises: passing the obtained crude biodiesel through an oil-water separator to further remove water, passing the dehydrated crude biodiesel into a reactor containing a low concentration of potassium hydroxide methanol solution for multiple acid reduction reactions, and obtaining acid-reduced biodiesel after the reaction. Methylacrylic anhydride and tertiary butylhydroquinone are subjected to an esterification reaction, and the synthesized product is subjected to a halogenation reaction with copper chloride. The resulting product is used to modify the fatty acid salts in the acid-reduced biodiesel to obtain the biodiesel of the present application. The present application has the effects of reducing the acidity of biodiesel, avoiding saponification reaction, improving anti-emulsification ability, and lowering the freezing point.

The invention provides a synthetic method of a novel flame retardant with a phosphaphenanthrene-chloropropyl synergistic structure. The preparation method comprises the following steps: synthesizing bis (1-chloro-2-propyl) phosphoryl chloride from phosphorus oxychloride and epoxypropane in a molar ratio of 1: 2 in a low-temperature condition through a micro-channel reactor, reacting with DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol), adding a specific solvent and a catalyst, reacting to generate a crude product, filtering, washing, carrying out reduced pressure distillation, and recrystallizing to obtain the 2-(1-chloro-2-propyl) phosphoryl chloride, namely the 2-(1-chloro-2-propyl) phosphoryl chloride-DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol). The novel flame retardant with the phosphaphenanthrene-chloropropyl synergistic structure is obtained. A phosphaphenanthrene-chloropropyl synergistic structure is designed, so that the molecular weight and the phosphorus content are improved, and the gas-phase flame-retardant and condensed carbon-forming synergistic flame-retardant effect is improved; the thermal stability and the molecular weight are improved through a molecular bridge chain (hydroquinone), and migration is inhibited. The flame retardant has excellent flame retardant property.

The application discloses an efficient treatment method of industrial waste salt, comprising the following steps: mixing the industrial waste salt with a certain proportion of functional particles, and performing microwave treatment; wherein the functional particles are composed of first functional particles and second functional particles; the first functional particles are selected from one or more of silicon carbide, diiron trioxide, titanium dioxide and zinc oxide; and the second functional particles are selected from one or more of 2,6-di-tert-butyl-p-cresol, hydroquinone, tert-butyl catechol and copper naphthenate. The functional particles used in the application have multiple functions such as microwave absorption, reaction catalysis, polymerization inhibition and antioxidation, etc. When the functional particles are mixed with the industrial waste salt and subjected to microwave irradiation, the organic and inorganic small molecules can be catalyzed to crack and generate gaseous small molecules, and meanwhile, the organic matters in the industrial waste salt can be prevented from polymerization, so that the increase of the content of organic polymers in the waste salt is avoided.

The invention discloses a virus-free culture method of lily bulbs, and relates to the technical field of lily bulb breeding, stem tips are adopted to culture lily bulbs, the stem tips have no vascular bundles, so that the lily bulbs contain few viruses, and an antioxidant is added to inhibit browning during stem tip culture; the preparation method comprises the following steps: preparing an antioxidant microcapsule by taking polyvinylpyrrolidone as a capsule wall and vitamin C, tert-butylhydroquinone and butylated hydroxyanisole as a capsule core, loading the antioxidant microcapsule on the surface of activated carbon, and adding a culture medium, so that the browning phenomenon is effectively inhibited; according to the method, detoxification propagation is carried out by utilizing a heat treatment method, the detoxification rate is effectively improved, detoxification is carried out by utilizing chemical treatment, and virus infection can be effectively inhibited by adding virazole, actinomycin D and 5-dihydrouracil into a culture medium, so that detoxified lily bulbs are cultured.

The invention discloses an antibacterial moisture-permeable polyester material and a preparation method thereof, and belongs to the technical field of polyester materials. The antibacterial moisture-permeable polyester material is prepared from the following raw material components in parts by mass: 100 parts of antibacterial polyester, 4 to 8 parts of super absorbent resin, 0.4 to 0.6 part of antioxidant and 3 to 5 parts of porous filler, the antibacterial polyester is obtained by at least taking unsaturated dibasic acid monomers and polyol monomers as raw materials, butyl titanate as a catalyst and hydroquinone as a polymerization inhibitor, carrying out esterification and polycondensation, then carrying out bromine addition, and finally reacting with N, N-dimethyl-3-nitrobenzamide. The superabsorbent resin is synthesized by taking a starch-based raw material, acrylamide and N-(4-nitrophenyl) acrylamide as reaction monomers, N, N '-methylene bisacrylamide as a cross-linking agent and ceric ammonium nitrate as an initiator, and the porous filler is prepared by firstly synthesizing an imidazolyl ionic liquid from trimethylimidazole and chloromethylnaphthalene and then adopting an external cross-linking method.

The invention provides a method for detecting hydroquinone and resorcinol in catechol, which adopts a high performance liquid chromatography detection method and comprises the following steps: (1) preparing a test solution, a catechol reference solution and a system applicability solution by adopting a diluent; the diluent adopts 0.2% acetic acid solution-methanol in a volume ratio of 75: 25; (2) taking octadecyl silane bonded silica gel as a filling agent; a mobile phase A is a 0.2% acetic acid solution, a mobile phase B is methanol, and gradient elution is carried out; and (3) respectively injecting the catechol reference substance solution, the system applicability solution and the test solution into a liquid chromatograph, and calculating the content of each component. The method can realize quantitative and accurate detection of hydroquinone and resorcinol in catechol, is convenient to operate and high in separation degree, and has important practical significance and application value for improving the quality control level of catechol, guaranteeing the safety of raw material medicines prepared by taking catechol as a starting material and the like.

The present application relates to a kind of short process technology for manufacturing high-performance phosphor copper ball by waste copper, belong to non-ferrous metal processing technical field.Waste copper is sorted, broken, soaked, paint removal, impurity removal and then added to medium-frequency induction melting furnace, and refining agent is added for refining;Phosphor copper alloy is slowly added to the copper liquid after refining;After adding phosphor copper alloy, the copper liquid is introduced into the upper continuous casting equipment, and the copper liquid is cooled and solidified in crystallizer, and phosphor copper ball blank is directly drawn;Phosphor copper ball blank is placed in annealing furnace, and annealing is carried out;Then it is cooled by polyetheramine-bisphenol A epoxy cooling liquid;Mechanical polishing, ultrasonic cleaning obtain high-performance phosphor copper ball;Polyetheramine-bisphenol A epoxy cooling liquid is prepared by polyetheramine, bisphenol A epoxy resin, ethylene glycol butyl ether, 2,5-dimercapto hydroquinone, dibutyl tin dilaurate, deionized water, triethylamine, graphene microsheet;Phosphor copper ball has high hardness and electrical conductivity, and is a kind of high-performance phosphor copper ball.

The invention provides an additive for an anti-elargol diffusion agent, the prepared anti-elargol diffusion agent and a preparation method, and relates to the field of metal surface treatment. The additive is prepared from 2-aminobenzothiazole, dibenzothiazyl disulfide, polyvinylpyrrolidone, tert-butylhydroquinone (TBHQ) and vinyl sorbate according to the weight ratio of (3.5-5): 3.8: (4.3-5): 4.3: (2.6-4). The additive, a film-forming agent, a buffering agent, a wetting agent, a cosolvent, a dispersing agent, a complexing agent, deionized water and the like are jointly prepared into the elargol diffusion preventing agent. The preparation method is simple, the use is convenient, a layer of protective film can be formed on the surface of the silver-plated lead frame after the silver colloid diffusion preventing agent is added, the diffusion of the conductive silver colloid can be effectively prevented, and the anti-discoloration capability of the silver-plated lead frame can be improved.

The invention relates to a novel pesticide suspending agent which comprises 40-70 wt% of illegal cooking oil methyl ester, 30-60 wt% of cashew nut oil, 0-2 wt% of an antioxidant and 0-3 wt% of a thixotropic agent, the ratio of the illegal cooking oil methyl ester to the cashew nut oil is larger than or equal to 1: 1, the antioxidant is tert-butylhydroquinone, the thixotropic agent is one of organic bentonite, hydrogenated castor oil and fumed silica, and the thixotropic agent is one of organic bentonite, hydrogenated castor oil and fumed silica. In conclusion, the condensation point of the pesticide suspending agent can be ensured to be less than or equal to-5 DEG C through synergistic pour point depressing of a hydroxy fatty acid structure; the method has the advantages of being wide in application range, capable of recycling resources, effectively reducing cost, high in product performance stability, small in environmental pollution and suitable for large-scale popularization.

The present invention relates to the field of chemical engineering, and discloses a methyl methacrylate refining method, which comprises: mixing crude methyl methacrylate with a composite extraction agent composition, the composite extraction agent comprises a component A, a component B and a component C, the component A captures methacrylic acid through acid-base neutralization, and the component C captures methacrylic acid through acid-base neutralization; the component B captures hydroquinone monomethyl ether through Lewis acid-base coordination, after chemical capture is completed, carbon dioxide is introduced into the composite extraction agent, the polarity of a compound of crude methyl methacrylate impurities and the extraction agent is increased, a system is driven to be subjected to phase separation, a purified methyl methacrylate phase and an impurity-loaded extraction agent phase are formed, and the hydroquinone monomethyl ether is obtained. And finally carrying out physical separation. The whole process is carried out under a water-free condition, so that the production of process wastewater is avoided, the process flow is simplified, an additional dewatering and drying unit is not needed, the impurity-loaded extracting agent can be regenerated and circulated in a heating and pressure-reducing manner, and the material consumption is reduced.

The invention relates to the technical field of organic synthesis, in particular to a synthetic method of 2, 5-dibromobenzoquinone, which takes hydroquinone as an initial raw material and comprises the following two steps: step 1, adding 0.5-2% (based on the mass of hydroquinone) of a phase transfer catalyst (such as tetrabutylammonium bromide) into a glacial acetic acid solvent, reacting with bromine at 10-15 DEG C to generate 2, 5-dibromohydroquinone, and reacting for 2-4 hours at the temperature of 10-15 DEG C to obtain 2, 5-dibromohydroquinone; after the reaction, stably storing an intermediate under the protection of inert gas; 2, oxidizing the 2, 5-dibromohydroquinone into 2, 5-dibromobenzoquinone at the temperature of 45-50 DEG C by taking acetonitrile as a solvent and adopting a tert-butyl hydroperoxide (TBHP)-sodium nitrite composite oxidant (the molar ratio is (10: 1)-(15: 1)); meanwhile, glacial acetic acid and acetonitrile mother liquor generated in the reaction process are subjected to vacuum rectification recovery (the acetonitrile recovery rate is greater than or equal to 90%, and the glacial acetic acid recovery rate is greater than or equal to 88%) for recycling. The invention solves the problems of more brominated byproducts, low oxidation efficiency, solvent waste and unstable intermediate in the prior art.

The invention relates to the technical field of polyester fiber synthesis, in particular to a high-elastic polyester fiber and a preparation method and application thereof. The problem that in the prior art, the mechanical property and the elastic property of polyester fibers cannot be considered at the same time is solved. According to the fiber obtained by the invention, a sheath layer is obtained by combining isophthalic acid, polycaprolactone glycol, modified nano silicon dioxide and ultra-high molecular weight polysiloxane; the core layer is prepared from modified nano silicon dioxide, trimethylolpropane triacrylate and hydroquinone; the structural uniformity of a polymer is controlled through step-by-step esterification and polycondensation, a stable fiber structure is formed through eccentric core-sheath spinning, trimethylolpropane triacrylate is initiated to be crosslinked by combining electron beam irradiation, and heat treatment is performed to prepare the composite material. The obtained polyester fiber has high tensile strength and high elongation at break, shows excellent elastic recovery rate, and is suitable for fillers of home textile products, clothes and furniture.

The present invention belongs to the field of catalysts, and specifically relates to a recyclable peroxidase mimetic enzyme, its preparation method, and application. The peroxidase mimetic enzyme comprises PVA aerogel and CuO nanoparticles, wherein the CuO nanoparticles are loaded on the surface of the PVA aerogel. The preparation method comprises sequentially immersing the PVA aerogel in a copper salt solution and an alkaline solution, washing, and drying the aerogel to obtain the peroxidase mimetic enzyme. The peroxidase mimetic enzyme prepared by the present invention not only has excellent catalytic performance, but is also easy to recycle and separate after the catalytic reaction, can be reused, and still maintains good catalytic performance after repeated recycling ten times. Moreover, when the peroxidase mimetic enzyme is removed during the catalytic reaction, the reaction rate is significantly reduced, achieving the effect that the reaction can be controlled at any time. In addition, the peroxidase mimetic enzyme can achieve highly sensitive and instant detection of hydroquinone / catechol, has a simple operation process, does not require specialized instruments and professionals, greatly improves detection speed, and reduces labor costs.

This invention relates to the field of reinforcement materials technology, specifically to reactive low-temperature reinforcement materials for mining, their preparation methods, and applications. The reactive low-temperature reinforcement material for mining comprises component A and component B. Component A consists of polyester polyol, polyether polyol, silane coupling agent, and catalyst; component B consists of prepolymer and additives. The prepolymer is obtained by reacting polyether polyol b with polymethylene polyphenyl polyisocyanate. Polyether polyol b has a functionality of 3.1 and a hydroxyl value of 207 mg KOH / g, and is a polyether polyol polymerized with propylene oxide using maltitol, trimethylolpropane, hydroquinone, and triethylene glycol as initiators. The material prepared by this invention is primarily reactive in structure and flame-retardant, avoiding the impact of adding large amounts of additive flame retardants on material strength. The resulting material exhibits high compressive strength, low internal heat of reaction, and good flame-retardant properties.

This invention discloses a high-temperature and low-temperature resistant plastic film and its preparation method, relating to the field of polymer materials. In preparing the high-temperature and low-temperature resistant plastic film, bis(4-fluorophenyl)phosphine oxide is reacted sequentially with acrylonitrile, hydroquinone with 4,4'-difluorobenzophenone, 2,4-dihydroxybenzonitrile, N-(2-aminopropyl)maleimide, and furfuryl isocyanate to obtain functionalized polyetheretherketone (PEEK). Glass fibers are then reacted sequentially with N-(3-trimethoxysilylpropyl)pyrrole, 1-allyl-1H-pyrrole with 1-methylpyrrole, N-(furan-2-ylmethyl)ethylamine, and 1,3-propanesulfonic acid lactone to obtain functionalized glass fibers. The functionalized glass fibers and functionalized PEEK are mixed, coated onto a polytetrafluoroethylene (PTFE) plate, and scraped off to obtain the high-temperature and low-temperature resistant plastic film. The high-temperature and low-temperature resistant plastic film prepared by this invention possesses durability, antibacterial properties, self-healing properties, antistatic properties, and flame retardant properties.

The invention relates to the technical field of oilfield development engineering, and discloses delayed gel, a profile control agent and a preparation method of the profile control agent, and the delayed gel comprises the following components in percentage by mass: 10-40% of sulfonated tannin extract, 1.0-4.0% of urotropine, 1.0-4.0% of hydroquinone, 10-20% of silicate particles and the balance of water; the profile control agent is prepared from the following raw materials: drilling wastes, a consolidation agent and delayed gel, the drilling waste is composed of oil-based drilling cuttings and oilfield wastewater. The oilfield hazardous waste oil-based drilling cuttings are used as the main raw material of the profile control agent, so that the oilfield exploitation cost can be reduced, and harmless and resource utilization of the oil-based drilling cuttings can be realized; the filling layer is formed by utilizing the characteristics that the content of solid-phase particles in the oil-based drilling cuttings is high and the solid-phase particles with different size fractions exist, and the mixed liquid of the oil-based drilling cuttings and the oilfield wastewater stops flowing in a stratum dominant channel after the delayed gel is formed, so that plugging is realized.