29 results about "P-Aminophenol" patented technology

The invention relates to the technical field of adhesives, and discloses a preparation method of an epoxy resin adhesive, which comprises the following steps: reacting p-aminophenol with diphenyl dichlorosilane under the catalysis of triethanolamine to obtain di (p-aminophenoxy) diphenyl silane; the preparation method comprises the following steps: carrying out Mannich reaction on amino in di (p-aminophenoxy) diphenyl silane, amino in polyether amine, formaldehyde and phenol to obtain the silane-containing polyether amine type benzoxazine intermediate. And finally, uniformly mixing the silane-containing polyether amine type benzoxazine intermediate and epoxy resin, and curing to obtain the epoxy resin adhesive. The prepared silane-containing polyether amine benzoxazine intermediate contains a silane structure and a benzoxazine structure, both the silane structure and the benzoxazine structure have excellent heat resistance, and the epoxy resin adhesive prepared by adding the silane-containing polyether amine benzoxazine intermediate into epoxy resin has excellent heat resistance.

The invention discloses nearly-spherical silver powder formed by self-assembly of silver nanosheets and a preparation method and application of the nearly-spherical silver powder, and belongs to the technical field of micro-nano material preparation. The preparation method comprises the following steps: firstly, adding a dispersing agent solution into a silver precursor compound solution, stirring, then adding a morphology control agent solution, stirring, and finally adding a reducing agent solution for reaction; and after the reaction is completed, the prepared silver powder is washed and dried, and the nearly-spherical silver powder formed by self-assembly of the silver nanosheets is obtained. The nearly-spherical silver powder is formed through self-assembly of the silver nanosheets, the particle size range of the nearly-spherical silver powder is 0.5-2.0 m, the thickness range of the self-assembled silver nanosheets is 10-50 nm, the overall size is uniform, a large number of stacking faults exist on the surfaces of the silver nanosheets, and the silver nanosheets show an excellent catalytic effect in conversion of p-nitrophenol into p-aminophenol.

The invention discloses a low-damping PVC-U electrical conduit and a processing technology thereof, and belongs to the technical field of conduit preparation. The low-damping PVC-U electrical conduit is prepared from the following components in parts by weight: 70 to 80 parts of PVC resin, 30 to 42 parts of light calcium carbonate, 8 to 15 parts of ethylene-vinyl acetate copolymer, 0.5 to 1 part of ethylene bis stearamide, 3 to 6 parts of epoxy compound and 4 to 7 parts of compound stabilizer, the preparation method comprises the following steps: preparing an epoxy compound from ethyl benzoylacetate, 2-(trimethylsilyl) phenyl trifluoromethane sulfonate, p-toluenesulfonyl azide, p-aminophenol, p-toluenesulfonyl chloride, iodobenzene diacetic acid and rhodium diacetate as raw materials, and preparing the compound stabilizer from 2-(2-aminoethoxy) ethanol, 4-fluorophenol and xylene alkane diisocyanate as raw materials. The PVC-U electrical conduit prepared from the substances has the advantages of low damping, excellent stability, excellent mechanical property and excellent aging resistance.

The invention discloses a synthesis method of p-aminophenol derivatives, which comprises the following steps: dissolving a compound A in a mixed solvent of acetonitrile and water, cooling to 0-5 DEG C, then adding an organic and inorganic acid catalyst, reacting at room temperature, distilling to remove the solvent, and then adding citric acid to continuously react to obtain a compound B; the initial raw materials are simple and easy to obtain and easy to purchase and store on a large scale, and the synthesized p-aminophenol compound is high in purity and can meet the requirements of most industrial applications on product purity.

The application discloses an acid-resistant non-noble metal catalyst and a preparation method and application thereof, and particularly relates to the field of acid-resistant metal catalysts, and the preparation method of the acid-resistant non-noble metal catalyst comprises the following steps: step 1, preparation of a carrier; step 2, modification of the carrier; step 3, preparation of an impregnation solution; step 4, preparation of an unactivated catalyst; step 5, activation of the catalyst; and step 6, functionalization of the catalyst. The acid-resistant non-noble metal catalyst prepared by the application can be applied to the synthesis of p-aminophenol from nitrobenzene. The catalyst has good acid resistance and stability, and when applied to the process of preparing p-aminophenol by rearrangement of nitrobenzene hydrogenation, the catalyst has high activity and high selectivity of p-aminophenol under relatively mild reaction conditions, the production conditions are improved, the production cost is reduced, and the product quality is improved.

The invention belongs to the technical field of electrolytic synthesis, and particularly relates to a method for synthesizing p-aminophenol and persulfate. According to the application, a cathode electrocatalytic reduction synthesis process of p-aminophenol and an anode electrocatalytic oxidation synthesis process of persulfate are innovatively coupled, and the cathode current efficiency in the preparation process of p-aminophenol is effectively improved by regulating and controlling anode electrocatalytic temperature parameters. Performance test results show that the cathode current efficiency can reach 81.3%-89.82%, and compared with the cathode current efficiency of 80% or below in a conventional p-aminophenol preparation process, the technical breakthrough exceeding the expectation is achieved, and the unexpected technical effect is shown.

The invention discloses a synthesis method of 4, 4 '-bis (4-aminophenoxy) biphenyl, which comprises the following steps: (1) carrying out salt forming reaction on p-aminophenol and inorganic strong alkali to obtain a suspension containing p-aminophenol salt; the salt forming reaction is carried out in the presence of sodium hydrosulfite; and (2) reacting the p-aminophenol suspension obtained in the step (1) with 4, 4 '-dihalogenated biphenyl to obtain 4, 4'-bis (4-aminophenoxy) biphenyl. The method provided by the invention not only avoids the problem of high production cost caused by the need of a noble metal catalyst for catalytic hydrogenation in the prior art, but also avoids the problems of more three wastes and environmental unfriendliness in the prior art, and has the advantages of low production cost, high safety, environmental friendliness and suitability for industrial mass production.

The application relates to application of a solid acid catalytic catalyst in preparation of p-aminophenol through nitrobenzene hydrogenation. The application comprises the following steps: adding a solid acid catalyst, cetyltrimethylammonium bromide, deionized water and nitrobenzene into a high-pressure reactor, and reacting under magnetic stirring for 0-24 hours at 25-150 DEG C to obtain the product p-aminophenol. The activated carbon for preparing the solid acid catalyst is coconut shell activated carbon, the series of activated carbon has the advantages of large specific surface area, rich micropores and strong adsorption capacity, and the coconut shell activated carbon solid acid with different acidities is prepared to catalyze the nitrobenzene hydrogenation reaction. The application avoids using traditional liquid acid sulfuric acid to provide the acidic active sites required by the reaction, greatly alleviates the problems of equipment corrosion, environmental unfriendliness, catalyst and product separation difficulty and the like. The catalyst used has good performance, the conversion rate of nitrobenzene is up to 100%, and the yield of p-aminophenol is up to 81.17%.

The present invention provides a preparation method of a phosphorus-containing compound modified imido epoxy resin, comprising the following steps: step 1: reacting phenolphthalein and p-aminophenol to obtain an imido-containing polyphenol compound; step 2: reacting the imido-containing polyphenol compound and epichlorohydrin to obtain an imido-containing multifunctional epoxy resin; step 3: reacting the imido-containing multifunctional epoxy resin with a phosphorus-containing compound to obtain a phosphorus-containing compound modified imido epoxy resin. Imide groups and epoxy groups are gradually introduced into the phosphorus-containing compound, and the generated phosphorus-containing compound modified imido epoxy resin contains more benzene rings and imide structures, thereby improving the heat resistance of the epoxy resin. The N element in the imide group and the P element in the phosphorus-containing compound utilize the N-P synergistic effect to enhance flame retardancy while reducing phosphorus content, thereby reducing the water absorption rate of the resin.

A prepreg having excellent processability and handleability and that can be processed into a cured product with high heat resistance is described along with a method to produce such a prepreg without being restricted by the types and contents of the matrix resin components used, where the prepreg includes at least components [A] to [D] as defined below and a preliminary reaction product that is a reaction product of the component [B] and the component [C]: [A] carbon fiber, [B] epoxy resin comprising a m- or p-aminophenol epoxy resin [b1] and either a glycidyl ether epoxy resin or a glycidyl amine epoxy resin [b2] that has two or more glycidyl groups in a molecule, [C] curing agent, and [D] thermoplastic resin.

The invention belongs to the technical field of acetaminophen medicine synthesis, and particularly relates to a preparation method of acetaminophen, which is characterized in that acetaminophen and glacial acetic acid are subjected to one-step amidation reaction in a negative-pressure low-temperature reaction system to synthesize acetaminophen. The method solves the problems of high acetaminophen preparation temperature, easy raw material oxidation, low crude product quality, high cost and environmental protection potential safety hazard.

The invention provides a biosensor, a nucleic acid detection and typing system based on a CRISPR system, a detection method and application, and belongs to the technical field of biological detection, alkaline phosphatase is adopted for catalyzing hydrolysis of p-aminophenyl phosphate to obtain p-aminophenol, the p-aminophenol is used for reducing silver ions, metal silver is deposited on the surfaces of gold nanoparticles, and the gold nanoparticles can be used for detecting the nucleic acid. Compared with a traditional Cas12a detection method combining ALP mediated p-nitrophenyl phosphate hydrolysis, the CRISPR / Cas12a biosensing strategy combining ALP has the advantages that the sensitivity is improved by 10,000 times, target DNA can be detected through naked eyes, the detection limit is as low as 300 aM, and the potential of no instrument application is shown.

A chemical detoxification method of p-nitrophenol comprises the following steps: S1, adding p-nitrophenol solution, reducing agent and carbon-doped boron nitride non-metal photocatalyst into a quartz reaction tube, stirring uniformly, discharging oxygen and maintaining atmosphere by nitrogen; S2, placing the mixed reaction system into a light reaction instrument, opening a xenon lamp as a light source, opening circulating water, and reacting for 8-60 min at normal temperature; S3, filtering the reaction liquid, and obtaining low-toxicity p-aminophenol compound. The present application uses carbon-doped boron nitride as a non-metal photocatalyst, ethanol or glucose as a reducing agent, and a xenon lamp to simulate sunlight, and reduces p-nitrophenol to p-aminophenol in a nitrogen atmosphere, without using sodium borohydride and metal or noble metal-containing catalysts, and realizing green and efficient detoxification of p-nitrophenol.

This invention provides a halogen-free resin composition and its applications. The halogen-free resin composition comprises the following components in parts by weight: 100 parts by weight of epoxy resin, including at least epoxidized polybutadiene resin; 50-100 parts by weight of p-aminophenol-modified maleimide resin, wherein the weight-average molecular weight of the p-aminophenol-modified maleimide resin is 500-800; and 70-90 parts by weight of benzoxazine resin. The halogen-free resin composition of this invention has a high heat resistance (Tg), excellent heat resistance, effectively reduces the warpage height of resin composition products, has a low coefficient of thermal expansion, and improves the reliability of laminated sheets with polyphenylene ether resin systems or hydrocarbon resin systems. It also provides excellent processability for prepregs and printed circuit board laminates.

The invention provides a preparation method of bio-based high-performance epoxy resin. The preparation method comprises the following steps: firstly, taking bio-based aldehydes and p-aminophenol as raw materials, and reacting at 50 DEG C for 3 hours to obtain a bio-based aldehyde Schiff base-containing compound; secondly, reacting the bio-based aldehyde compound containing the Schiff base with epoxy chloropropane at 80 DEG C for 6 hours to obtain a bio-based aldehyde epoxy monomer containing the Schiff base; methyl tetrahydrophthalic anhydride is used as a curing agent, and the bio-based aldehyde Schiff base-containing epoxy monomer and bisphenol A epoxy resin are mixed according to a certain proportion to obtain the bio-based high-performance epoxy resin. The bio-based aldehyde epoxy resin researched and developed by the invention not only has innovativeness in technology, but also has wide application potential in practical application. In the field of traditional electrical insulation, the method is expected to become a powerful competitor in the market, and provides beneficial reference for sustainable development and green chemistry.

The invention discloses application of a B-CDs (at) EuBTC composite material. The B-CDs (at) EuBTC composite material is used for qualitative and / or quantitative detection of p-aminophenol. The B-CDs (at) EuBTC composite material comprises a metal organic framework EuBTC and carbon dots loaded on the metal organic framework EuBTC, B-CDs represent blue light carbon dots, and BTC represents a ligand trimesic acid. The B-CDs (at) EuBTC composite material provided by the invention has excellent solvent stability, realizes ratio type fluorescence sensing on a biomarker p-aminophenol (PAP), has a detection limit of 0.65 mu M, and has the characteristics of good stability, high sensitivity, strong anti-interference performance, short response time and good cycle performance.

The invention relates to the technical field of power device packaging, in particular to a low-thermal-expansion high-temperature-resistant epoxy resin composition and a preparation method thereof.The low-thermal-expansion high-temperature-resistant epoxy resin composition is prepared from, by weight, 12-25% of epoxy resin, 5-10% of curing agent, 0.5-5% of diluent, 0.1-0.5% of coupling agent and 75-90% of modified silicon dioxide, the organic solvent is any one of 2, 2-bis (4-hydroxyphenyl) propane, 4, 4 '-dihydroxydiphenylmethane, 4, 4'-dihydroxydiphenyl sulfone, 2, 2-bis (3, 5-dibromo-4-hydroxyphenyl) propane, 2, 2-bis (4-hydroxycyclohexyl) propane, 4, 4 '-dihydroxybiphenyl, 4, 4'-dihydroxydiphenyl ether, p-aminophenol, m-aminophenol, 4-hydroxyaniline and 3, 4-epoxy cyclohexylmethanol. The low-thermal-expansion and high-temperature-resistant epoxy resin composition disclosed by the invention has relatively low thermal expansion coefficient, relatively high glass-transition temperature and relatively high mechanical properties, meets the high-temperature service requirements of power devices, and is particularly suitable for scenes with requirements on high strength, high toughness and high stability.

The application belongs to the technical field of electrochemical sensors, and discloses a kind of ion liquid gel microsphere composite electrode loaded with MXene and its preparation method and application in electrochemical detection of p-aminophenol.The preparation method is as follows: prepare a few-layer MXene aqueous solution, prepare PMMA / BMIMPF6 gel microsphere powder aqueous dispersion, add PMMA / BMIMPF6 gel microsphere dispersion to MXene aqueous solution, stir, ultrasonic oscillation, filter, wash, collect filter cake, freeze-drying to prepare PMMA / BMIMPF6 / MXene powder, take the above-mentioned powder and disperse it in anhydrous ethanol, ultrasonic oscillation, drop to carbon cloth, air dry, place at room temperature, make the electrode material and carbon cloth fully combined, and prepare PMMA / BMIMPF6 / MXene / CC composite electrode.The application not only provides a new electrochemical sensing scheme for efficient, rapid and economical detection of phenolic pollutants such as p-aminophenol in water environment, but also provides a new idea for the design and development of functional composite electrochemical electrode materials.

This invention relates to a method for synthesizing p-aminophenol type epoxy resin, belonging to the field of epoxy resin preparation technology. By adding n-butanol and / or cyclopentyl methyl ether to the reaction system, this invention can effectively reduce the total chlorine content of the p-aminophenol type epoxy resin product and improve its purity. The total chlorine content of the p-aminophenol type epoxy resin synthesized by this invention is less than 500 ppm. In this invention, n-butanol and cyclopentyl methyl ether are slightly soluble in water. During the cyclization reaction stage, when sodium hydroxide solution is used as a catalyst, n-butanol and cyclopentyl methyl ether can form a transition phase, promoting the uniform migration of sodium hydroxide from the aqueous phase to the interface between the two phases to participate in the reaction. This promotes the stable progress of the cyclization reaction, reduces the occurrence of side reactions, thereby reducing the total chlorine content of the p-aminophenol type epoxy resin and improving the synthesis yield of the p-aminophenol type epoxy resin.

The invention discloses a rectification system for treating p-aminophenol mother liquor and a rectification method thereof, and relates to the technical field of chemical separation. Comprising a rectifying tower, an evaporator, a reflux tank, a compressor, a feed preheater and a reboiler, p-aminophenol mother liquor is continuously fed into the rectifying tower at a middle feed port of the rectifying tower, a tower top outlet of the rectifying tower is connected with a shell pass inlet of the evaporator, and a shell pass outlet of the evaporator is connected with the reflux tank; a tower kettle of the rectifying tower is communicated with a tube pass of the reboiler, the evaporator, the compressor, the feeding preheater and the reboiler are sequentially connected through a closed-loop pipeline to form a closed heat pump circulation unit, a tube pass outlet of the evaporator is connected with a shell pass inlet of the reboiler through the compressor and the feeding preheater, and a tube pass outlet of the reboiler is connected with a tube pass outlet of the feeding preheater. A shell pass outlet of the reboiler is communicated with a tube pass inlet of the evaporator, and the temperature of a tower kettle of the rectifying tower is maintained at 75-80 DEG C. According to the invention, stable, efficient and energy-saving rectification at ultralow temperature is realized, and the product yield and quality are greatly improved.

The invention relates to a synthetic method of p-aminophenol epoxy resin, and belongs to the technical field of epoxy resin preparation. According to the method, n-butyl alcohol and / or cyclopentyl methyl ether are / is added into a reaction system, the total chlorine content of the p-aminophenol epoxy resin product can be effectively reduced, the purity of the product is improved, and the total chlorine content of the synthesized p-aminophenol epoxy resin is smaller than 500 ppm. According to the method, n-butyl alcohol and cyclopentyl methyl ether are slightly dissolved in water, in the cyclization reaction stage, when a sodium hydroxide solution serves as a catalyst, n-butyl alcohol and cyclopentyl methyl ether can form a transition phase, sodium hydroxide in a water phase is promoted to evenly migrate to a two-phase interface to participate in the reaction, the cyclization reaction is promoted to be stably carried out, side reactions are reduced, and the yield is increased. Therefore, the total chlorine content of the p-aminophenol type epoxy resin is reduced, and the synthesis yield of the p-aminophenol type epoxy resin is improved.

The present invention relates to a process for the preparation of a compound of formula (I), wherein X represents CR 23 or N; Y represents CR 24 or N; R 1 represents H or COR 3 group; R 21 , R 22 , R 23 and R 24 independently represent hydrogen, a halogen, a nitro group, a cyano group, a CF3group, a (C1-C6)-alkyl group, a COOH group, a COR 4 , COOR 5 or CONR 6 R 7 ; R 3 , R 4 and R 5 independently represent (C1-C6)-alkyl, and R 6 and R 7 independently represent hydrogen or a (C1-C6)-alkyl group.

The present invention relates to the technical field of polymer compounds and discloses a calcium sulfate whisker reinforced plastic sheet and its preparation process. Preparation process: S1: Take p-aminophenol, octadecanal, and anhydrous ethanol, stir at 60-70°C for 3-6 hours, remove the solvent, wash, and dry to obtain a Schiff base; take the Schiff base, DOPO, and anhydrous ethanol, stir at 60-70°C for 4-6 hours, cool, filter, wash, and dry to obtain modified DOPO; take the modified DOPO, tetraethylene glycol diglycidyl ether, bisphenol F diglycidyl ether, and dimethylformamide, heat and stir uniformly, raise the temperature to 110-130°C, stir for 4-6 hours, remove the solvent, and obtain a flame retardant; S2: Mix and stir epoxy resin, calcium sulfate whisker filler, and flame retardant, add a curing agent, stir and mix uniformly, vacuum degas, and place in a mold for curing to obtain a plastic sheet.

The present disclosure relates to a process for the preparation of p-aminophenol. The process of the present disclosure is simple, efficient, cost effective and commercially scalable. The process of the present disclosure provides p-aminophenol having a comparatively high selectivity and high yield.

The application belongs to the field of two-dimensional few-layer nanomaterial preparation and photocatalysis technology, and particularly relates to a preparation method of Bi2Ti2O7 / MXene two-dimensional composite few-layer material and application of the material in photocatalytic reduction of p-nitrophenol to p-aminophenol. The preparation method uses bismuth salt and titanium salt as raw materials, and polyhydric alcohol as a structure regulator. Bi2Ti2O7 two-dimensional few-layer material is prepared through hydrothermal reaction in an alkaline environment. Then, the surface of Bi2Ti2O7 is positively charged through surface protonation treatment, and the Bi2Ti2O7 is combined with MXene suspension through electrostatic interaction to construct two-dimensional composite few-layer material. The composite material has close interface contact and excellent photogenerated carrier separation efficiency, and exhibits significantly better catalytic activity than traditional morphology materials and simple mixed materials in the reaction of photocatalytic reduction of p-nitrophenol to p-aminophenol.

The application discloses a method for recycling p-aminophenol in wastewater, and belongs to the technical field of wastewater treatment. First, p-nitrophenol wastewater is adsorbed by carbon fibers, and then is treated by a microbial fuel cell. Protons and electrons are generated in an anode liquid of an anode modified graphite felt, the electrons are transmitted to a cathode through a wire, the protons are simultaneously transferred to the cathode chamber through a membrane, and the organic matters adhered to the carbon fibers are degraded after being combined in the cathode chamber. Finally, the carbon fibers and the organic matters are separated, and then are subjected to vacuum distillation in deionized water, concentrated evaporation, and p-aminophenol is obtained. The microbial fuel cell has good electricity generation performance, stable performance, high anode COD removal rate, and efficient use of electric charges in the cathode, so that the removal rate of p-nitrophenol is high, and the generation of p-aminophenol is promoted.

The application relates to the technical field of adhesives, and discloses a preparation method of an epoxy resin adhesive. Para-aminophenol is reacted with diphenyl dichlorosilane under the catalysis of triethanolamine to obtain di(para-aminophenoxy)diphenyl silane; the amino groups in the di(para-aminophenoxy)diphenyl silane and the amino groups in polyether amine are subjected to Mannich reaction with formaldehyde and phenol to obtain a silane-containing polyether amine type benzoxazine intermediate. Finally, the silane-containing polyether amine type benzoxazine intermediate and epoxy resin are uniformly mixed, and curing is carried out to obtain the epoxy resin adhesive. The silane-containing polyether amine type benzoxazine intermediate prepared by the method contains a silane structure and a benzoxazine structure, both of which have excellent heat resistance; when the silane-containing polyether amine type benzoxazine intermediate is added to the epoxy resin, the prepared epoxy resin adhesive has excellent heat resistance.

The present disclosure relates to a process for the preparation of p-aminophenol. The process of the present disclosure is simple, efficient, cost effective and commercially scalable. The present disclosure provides p-aminophenol having a comparatively high selectivity and high yield.

The application discloses a kind of adsorption processes to p-aminophenol in wastewater, belong to wastewater treatment technical field, including the following steps: adjusting wastewater pH value is 7-9, filtration removes suspended solids and mechanical impurities, obtains pretreated wastewater;Selective magnetic adsorbent is added to pretreated wastewater, after stirring 30min, magnet separation, obtain p-aminophenol extract and primary wastewater;Primary wastewater is subjected to chemical oxidation treatment, oxidation effluent is subjected to subsequent treatment again;P-aminophenol extract is placed in eluent, after ultrasonic elution 20-30min, magnet separation, obtain p-aminophenol mixed solution and regenerated selective magnetic adsorbent, p-aminophenol mixed solution is recycled p-aminophenol product, the adsorption process of p-aminophenol in wastewater provided by the application is not only simple, and the p-aminophenol recovery rate obtained is high, and the purity is high.