59 results about "Phenolphtaleine" patented technology

The invention relates to the technical field of environmental analytical chemistry, and discloses a thymol phenolphthalein-TBPE double indicator-based cyanide titration detection method and system, and the method comprises the following steps: adjusting a water sample to be detected to an alkaline pH interval to construct a detection matrix; the method comprises the following steps: introducing a double-indicator system composed of thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester according to a specific ratio into a detection matrix, and constructing a spectrum background for masking yellow interference of sulfide by utilizing the blue color development characteristic of thymol phenolphthalein; dropwise adding a silver nitrate standard solution into the mixed system to execute a complex reaction; according to the method, a spectrum background shielding field is constructed, chromaticity response of a system in a specific wave band is monitored in real time, and when a chromaticity mutation signal from green to bluish violet is captured, a titration end point is judged, and the cyanide concentration is calculated. High-precision anti-interference detection on cyanide in a complex high-turbidity matrix is realized, and the sensitivity and accuracy of end point recognition are improved.

This invention discloses a high-modulus, high-toughness bismaleimide resin composition, a carbon fiber prepreg, and a preparation method thereof, belonging to the field of composite material technology. The bismaleimide resin composition of this invention comprises the following raw materials in parts by weight: 40-80 parts bismaleimide resin, 10-20 parts o-diallyl bisphenol A, and 5-10 parts a powder toughening agent containing phenolphthalein side chains. The carbon fiber prepreg of this invention is made from the above resin composition and carbon fibers, with thermoplastic polyimide felt interlayered to form an integrated structure. This allows the composite material prepared from the carbon fiber prepreg to maintain high modulus and high temperature resistance while significantly improving its toughness, impact damage tolerance, and interlayer delamination resistance. Furthermore, the prepreg of this invention has good processability and is suitable for manufacturing high-performance complex components.

The invention discloses a rapid detection and on-site treatment method for ammonia and black oil in fly ash, which comprises the following steps: 1) weighing 200g of fly ash from the batch of fly ash, putting the fly ash into a conical flask, adding 80g-90g of water for stirring, and stirring; (2) after stirring is completed, covering a conical bottle opening with test paper soaked with a 1% phenolphthalein alcohol solution; 3) if the test paper turns red, determining that ammonia with relatively high content exists; 4) standing for 8-10 minutes, and observing whether black oil exists on the surface of the neat paste; 5) after the detection is completed, treating excessive ammonia and black oil in the fly ash; according to the present invention, the ammonia content is rapidly detected by using the test paper impregnated with the 1% phenolphthalein alcohol solution, the black oil is observed by standing, and the concrete stirring and vibrating process is combined so as to achieve the real-time determination and the emergency treatment of the fly ash pollutants, such that the concrete structure quality is improved, and the fly ash field detection method is supplemented.

The invention relates to the technical field of concrete detection, in particular to an instrument for detecting concrete carbonization depth by using an imaging technology. According to the technical scheme, the device comprises a box body, a first cavity and a second cavity are formed in one side of the box body, holes of the specified size are punched in the wall face through a punching assembly, then residual concrete chippings in the holes are blown away through a cleaning assembly, the interiors of the holes are kept clean and tidy, then a phenolphthalein alcohol solution is added into a storage frame, and the phenolphthalein alcohol solution is stored in the storage frame; the phenolphthalein alcohol solution is sprayed into the hole through the spraying assembly, the color of the concrete contaminated with the phenolphthalein alcohol solution can be changed due to different pH values, so that the color of the uncarbonized concrete is changed, then the detection assembly extends into the hole, and the color-changing part in the hole is detected by utilizing an imaging technology; and digital images and depth data are obtained and are convenient to analyze and store, so that the problem of detection result deviation easily caused by sight obstruction during detection is solved.

The invention relates to the field of chemical analysis and detection, in particular to a method for rapidly detecting the concentration of industrial concentrated acid based on neutralization reaction, which comprises the following steps: 1, theoretical calculation; converting molar concentration according to acid density and mass fraction; 2, accurately measuring the volume of target acid by using a pipette; 2, injecting 100-150ml of pure water into the triangular flask, and adding 3-5 drops of phenolphthalein; 3, slowly injecting an acid sample into the triangular flask, and slightly shaking and uniformly mixing; 4, adding 10.00 ml of NaOH solution by using the pipette, and oscillating for 10-20 seconds; 3, result interpretation: transparency and colorless: acid is excessive when the acid concentration reaches the standard, pH is less than or equal to 8.2 after neutralization, pink lasts for 20-30 seconds, and reinspection is needed when the acid concentration is insufficient and the pH is greater than or equal to 8.3. The method has the beneficial effects that 1, a reverse judgment method is adopted, namely the conventional end-point titration is replaced by fixed alkali amount, so that the detection time is shortened to 2 minutes; 2, safety design: pre-dilution reduces the risk of acid mist, and only a trace amount of raw acid is needed to avoid acid corrosion; 3, multi-acid adaptation: compatibility with detection of different types of concentrated acids is realized through pipetting volume adjustment;

The present invention aims to provide a cell inoculum and a cell transplantation substrate which can be subcultured without causing cell transformation and can effectively implant cells. An inoculum and a transplantation substrate containing a phenolphthalein derivative for facilitating implantation of cultured corneal endothelial cells or corneal endothelial replacement cells. The inoculum and the transplantation substrate can facilitate adhesion of cells during subculture and implantation of cells during transplantation.

The application relates to the technical field of processing and preparation of wood-based functional materials, and particularly discloses a wood-based friction material with a service life self-monitoring function and a preparation method thereof, which comprises the following steps: dispersing poplar powder in a co-solvent formed by mixing choline chloride and dihydroxide oxalic acid to obtain a mixed liquid, diluting and washing with water to obtain filter residue A; dispersing the filter residue A in distilled water I, adding sodium chlorite and acetic acid, stirring, and washing with water to obtain filter residue B; dispersing the filter residue B in distilled water II, adding phenolphthalein, and crushing to obtain a dispersion liquid; adding sodium chloride, solid Tris and tannic acid into the dispersion liquid, stirring, and washing with water to obtain filter residue C; dispersing the filter residue C in distilled water III, adding polyvinyl alcohol, stirring, pouring into a mold, and drying; dispersing the filter residue A in distilled water, adding sodium hydroxide and polyvinyl alcohol, stirring to obtain a mixed base liquid, continuously pouring into the mold, and drying to obtain the wood-based friction material. The friction material has the service life self-monitoring function, and the method is simple and low in cost.

The application provides a crosslinked thermal rearrangement polybenzoxazole hollow fiber gas separation membrane and a preparation method and application thereof, and belongs to the technical field of polymer membrane separation. In the synthesis of the polymer, a phenolphthalein-based diamine monomer with a lactone ring is introduced, so that the phenolphthalein-based diamine monomer is polycondensed with a dianhydride to form a polyimide, and then the polyimide is prepared into a hollow fiber membrane precursor, and then crosslinking is performed at a lower temperature, and then the temperature is further increased to prepare a thermal rearrangement hollow fiber membrane. At this time, the polymer chains are crosslinked, the flowability is hindered, the thickening degree of the skin layer is greatly reduced, and the plasticization resistance is also improved.

The purpose of the present invention is to maintain the activity of an enzyme while reducing proliferation of microorganisms that cause food deterioration in a state where the enzyme is dissolved in water. The present invention provides a food composition that satisfies all of the following requirements (a)-(d). (a) The moisture content in terms of wet mass is 20 mass% or more. (b) The pH at 20°C and 1 atm is more than 4.0. (c) The titratable acidity of the food composition when measured by a measurement method A is 0.1 mass% or more. Measurement method A 10 g of the food composition is accurately collected and diluted 10-fold with ion-exchanged water, 0.08 ml of a 3.1% phenolphthalein solution serving as an indicator is added to the diluted solution (100 g), the resulting solution is neutralized by titration with a 0.1 mol / L sodium hydroxide liquid having a known titer, and the titratable acidity is determined by the following formula.　Titratable acidity (mass%) of food composition={(60.05×0.1×F×V)×100} / {collection quantity (10 g)×1000} 60.05: Molecular weight of acetic acid 0.1: Molar concentration (mol / L) of sodium hydroxide solution F: Titer of 0.1 mol / L sodium hydroxide solution V: Titration amount (mL) of 0.1 mol / L sodium hydroxide (d) The following requirements (i) and / or (ii) are satisfied. Requirement (i) The following formula is satisfied: 4Y+X≥10 (provided that X≥3 and Y>0.03 are satisfied), where X g represents the amount of sodium chloride equivalent per 100 g of water of the food composition, and Y g represents the content of non-dissociated acetic acid per 100 g of water of the food composition. Requirement (ii) The amount of sodium chloride equivalent per 100 g of water of the food composition is 3.0 g or more, and the ethanol content per 100 g of water of the food composition is 8.0 g or more.

The invention discloses a dosage calculation method for reducing sewage hardness through a dual-alkali method. The method comprises the specific calculation steps that 1, the total hardness and calcium hardness of sewage are measured; 2, calculating the magnesium hardness; step 3, determining phenolphthalein alkalinity and methyl orange alkalinity of the sewage; 4, calculating the concentrations of hydroxide, carbonate and bicarbonate; step 5, setting a double-alkali excess amount; step 6, calculating the dosage of NaOH; and step 7, calculating the dosage of Na2CO3. Compared with the prior art, the method has the advantages that the calculation precision is high: based on the actual ion concentration (calcium and magnesium hardness and alkalinity) of the sewage and a clear chemical reaction metering relationship, the blindness of a trial and error method is avoided, the dosage can be accurately controlled, and the risk of agent waste (cost reduction) or substandard hardness reduction (membrane scaling prevention) is reduced; the response speed is high; the operation is simple; the economical efficiency is good; the applicability is wide.

The application discloses a reaction type thermoplastic resin with a large free volume, a preparation method and a bismaleimide resin composition, and belongs to the technical field of polymer material toughening. N 2 a nucleophilic polycondensation reaction to obtain a polyaryletherketone / sulfone copolymer containing a reaction type group, wherein the bisphenol compound is selected from one or more of phenolphthalein, thymolphthalein, bisphenol fluorene and isoindolinone-based bisphenol. The application introduces a bisphenol compound with a large side group into the molecular chain of the thermoplastic resin to construct a large free volume structure, and simultaneously utilizes TGSH to provide an active propenyl group, so that the resin can participate in the curing and cross-linking reaction of bismaleimide. The bismaleimide resin composition using the resin as a toughening agent has a significantly improved toughness after curing.

The invention relates to the field of pipes, and discloses a high-temperature-resistant MPP pipe and a preparation method thereof.The high-temperature-resistant MPP pipe comprises polypropylene resin, modified inorganic filler, a functional additive, ammonium polyphosphate and auxiliaries; the modified inorganic filler is prepared by grafting phenolphthalein POSS-based benzoxazine on the surface of the inorganic filler; the phenolphthalein POSS-based benzoxazine is prepared from a phenolphthalein silane coupling agent, paraformaldehyde and monoamino polyhedral oligomeric silsesquioxane through Mannich condensation reaction, wherein the phenolphthalein silane coupling agent is prepared by reacting phenolphthalein with 3-isocyanate propyl trimethoxy silane; the paraformaldehyde and the monoamino polyhedral oligomeric silsesquioxane are subjected to Mannich condensation reaction; according to the functional additive, phosphorus oxychloride is sequentially subjected to substitution with pentaerythritol phosphate and anhydrous piperazine to prepare a piperazinyl phosphorus-containing intermediate, then the piperazinyl phosphorus-containing intermediate and chloroacetyl chloride are subjected to substitution, and then the piperazinyl phosphorus-containing intermediate and dodecyl dimethyl tertiary amine continue to react to prepare the functional additive. The pipe is endowed with good mechanical property, high temperature resistance, flame retardance, water resistance and antibacterial property.

The application provides a resin composition, a prepreg, a laminated board and a preparation method thereof. The resin composition comprises the following components in parts by mass: 40-100 parts of phthalonitrile-terminated polyphenyl ether, 10-40 parts of phenolphthalein-based polyaryletheramine and 10-60 parts of inorganic filler; the structure of the phthalonitrile-terminated polyphenyl ether is shown in formula (I), and the structure of the phenolphthalein-based polyaryletheramine is shown in formula (II); wherein a, m and n are all positive integers, and Y is C1-C3 alkylene or a single bond. The laminated board prepared from the resin composition has high peeling strength, high decomposition temperature, high elastic modulus, good flame retardation, low dielectric coefficient, low water absorption and other excellent comprehensive properties.

The invention discloses a phenolphthalein polyaryletherketone nano composite material and a preparation method thereof, the composite material comprises the following components by mass: 50-70 wt% of a phenolphthalein polyaryletherketone (PEK-C) matrix, 10-30 wt% of a nano filler, 5-15 wt% of a flexibilizer, 1-5 wt% of an antioxidant, and 1-3 wt% of a processing aid, wherein all the components are physically mixed to form a uniformly dispersed integral structure, and the preparation method comprises the following steps: S1, pre-mixing the phenolphthalein polyaryletherketone matrix and the nano filler in a high-speed mixer; s2, adding the premixed materials into a double-screw extruder, and carrying out melt blending; s3, adding a toughening agent, an antioxidant and a processing aid in the extrusion process, and continuously mixing; and S4, cooling and pelletizing the extruded material to obtain the nano composite material particles. The invention belongs to the field of high polymer materials, and particularly relates to a phenolphthalein polyaryletherketone nanocomposite and a preparation method thereof.

The application discloses a preparation method and application of a phenolphthalein intercalated ammonium vanadate material. The phenolphthalein intercalated ammonium vanadate material is synthesized by a one-step solvothermal method, ammonium metavanadate is used as a vanadium source, a mixed solution of ethylene glycol and water is used as a reaction medium, and oxalic acid is used as a reducing agent, so that the phenolphthalein intercalated ammonium vanadate material is obtained under a solvothermal condition. The phenolphthalein molecules between layers of the material play a role of a support, and the hydrophobic phenolphthalein molecules can reduce direct contact between the material and water molecules, inhibit structural collapse and dissolution of the material in a cycle process and the like, and the material is applied to a water-based zinc ion battery as a positive electrode material, so that more excellent electrochemical performance and cycle stability are obtained.

The invention relates to the technical field of concrete detection, and discloses a concrete carbonization tester which comprises a tester body and a cover plate located at the rear end of the tester body, a nozzle is installed at the upper end of one side of the tester body, and a camera, a light supplementing lamp and a distance measuring probe are installed on the side, away from the nozzle, of the upper end of the tester body. A solvent in the solvent conveying mechanism and a solute in the solute conveying mechanism are mixed in the mixed liquid spraying mechanism to form a detection solution; spraying a phenolphthalein solution into the hole from the nozzle; the color of the carbonized part and the uncarbonized part is changed; the distance between the color-changing junction and the surface of the concrete is detected through the distance measuring probe, so that the specific carbonization depth can be measured; when the distance measuring probe measures the distance, the camera can shoot an image in the hole, and the image is displayed on the display screen, so that a color-changing junction can be accurately positioned; the tester can realize automatic batching and automatic detection.

The invention discloses a water conservancy gate detection device, which comprises an outer frame, and further comprises an execution device comprising a drilling assembly and a sealing disc; the liquid guide cylinder is fixedly connected to the inner wall of the sealing disc and is used for filling a phenolphthalein solution; the carbonization depth measuring scale is mounted at one end, positioned on the wall body to be measured, of the sealing disc and is used for measuring the carbonization depth of the drilled wall body; the driving motor is mounted at one end, opposite to the sealing disc, of the outer frame and is used for driving the drilling assembly, the liquid guide cylinder and the carbonization depth measuring scale to perform position switching; and a negative pressure adsorption device. The negative pressure adsorption device and the execution device are arranged, the whole process functions of punching, color development and measurement are integrated, a drilling assembly is arranged in the execution device, a measurement hole site meeting the requirement can be punched in a to-be-measured wall surface, a special phenolphthalein solution can be sprayed out of the hole site through a liquid guide cylinder, the hole site after color development can be detected through a carbonization depth measuring ruler, and the measurement accuracy is improved. Divers do not need to frequently replace tools.

The application discloses a method for detecting the acidity of a circulating solution of electro-deposited cobalt, which comprises the following steps: removing oxidizing substances in the circulating solution of electro-deposited cobalt by potassium iodide in an acidic medium; reacting the potassium iodide with potassium iodate and acid to generate iodine molecules; titrating with a sodium thiosulfate standard solution until the solution changes from blue or blue-black to the original color of the solution, which is the end point; and calculating the acidity content according to the mass balance. The method can effectively remove the oxidizing substances in the solution to be measured, avoid the interference with the determination of the acidity content, and make the detection result more accurate. The sodium thiosulfate is innovatively applied to the detection of the acidity of the circulating solution of electro-deposited cobalt, and the sodium thiosulfate titration is used to replace the commonly used sodium hydroxide titration method, so that the interference of the original color of the light red solution with the color judgment of the end point of the sodium hydroxide (phenolphthalein as an indicator) is avoided.

The invention relates to the technical field of lithium ion battery positive electrode material detection, in particular to a method for measuring the content of soluble lithium in a lithium manganate finished product, which comprises the following steps of: taking 5g of lithium manganate finished product sample, putting into a 250mL beaker, adding 50mL of purified water and a magnetic stirrer, covering, stirring for 20 minutes at the rotating speed of 550r / min, standing for 2 minutes, and filtering supernate by two layers of filter paper; transferring 10 mL of filtrate to a 250 mL conical flask, adding 40 mL of purified water, firstly adding 2 drops of phenolphthalein, titrating with 0.0104 mol / L hydrochloric acid until the solution is colorless (denoted as v1), then adding 3 drops of methyl red, continuously titrating until the solution is orange, boiling for 1 min, cooling, titrating until the solution is wine red (denoted as v2), and calculating according to the formula that the content of lithium carbonate is equal to (v2-v1) * 0.0104 * 73.886 / m; the method for determining the content of soluble lithium in the lithium manganate finished product is simple and accurate to operate, rapid and efficient, can optimize the process, saves time and labor, can determine the quality of soluble lithium so as to judge the performance of a material body in advance, and ensures the production of high-quality lithium manganate.

The invention discloses a preparation method of a recyclable phenolphthalein polyaryletherketone composite material, which comprises the following steps: selecting 65% of phenolphthalein polyaryletherketone resin (PEK-C) as a base material; 15% of carbon fibers, 10% of glass fibers, 8% of ceramic particles and 2% of metal powder are selected as reinforcing materials; a matrix material and a reinforcing material are uniformly mixed, it is ensured that the matrix material can completely permeate into the reinforcing material to form a stable composite material, and when the matrix material and the reinforcing material are uniformly mixed, a recycling agent is selected and added into the mixed composite material, so that the viscosity of resin can be effectively reduced in the recycling process of the composite material; the resin is promoted to be degraded into small molecular units so as to promote the degradation of the resin. The invention relates to the technical field of polymer composite material processing, and the composite material can be conveniently recycled while ensuring excellent physical and chemical properties, so that environmental pollution is reduced, and a new way is provided for realizing sustainable utilization of resources.

The invention creatively discloses a phenolphthalein polyarylether sulfone immobilized enzyme and a preparation method thereof, relates to the technical field of high polymer material science and bioengineering, and solves the technical problems of low structural strength, insufficient loading capacity and poor extreme condition resistance in the existing conventional immobilized carrier technical scheme. Comprising the following steps: preparation of phenolphthalein polyarylether sulfone potassium salt and preparation of immobilized enzyme; the main chain of the carrier contains an ether bond and a sulfone bond, so that the carrier is stable in structure under high temperature, wide pH range and strong polar solvent environment, and the problem that a traditional carrier is easy to swell or corrode is avoided; the porous structure endows the carrier with a high specific surface area and a large aperture, can provide higher enzyme loading capacity, and can be adapted according to different enzyme requirements, so that the immobilization efficiency is improved; the side-chain carboxyl group efficiently fixes enzyme molecules through double effects of physical adsorption and ionic bonds, does not need a toxic cross-linking agent, protects the conformation of the enzyme molecules, prevents the enzyme molecules from leaking, and improves the mechanical stability of the immobilized enzyme.

The invention relates to the technical field of constructional engineering, and discloses a concrete carbonization depth detection method and system, and the detection method comprises the following steps: drilling a hole in the surface of a to-be-detected concrete structure; spraying phenolphthalein alcohol to the concrete powder when the drill bit carries out the concrete powder in the hole; obtaining the color of the concrete powder sprayed with phenolphthalein alcohol; if the concrete powder sprayed with the phenolphthalein alcohol is red, drilling is stopped, and the drilling depth at the moment is measured; and if the concrete powder sprayed with the phenolphthalein alcohol is not red, continuously drilling until the concrete powder is red. In the drilling process of the concrete structure, powder generated during drilling can be continuously brought out of the hole, phenolphthalein alcohol is directly sprayed to the external powder, whether concrete is carbonized or not can be quickly responded in real time according to whether a phenolphthalein alcohol reagent becomes red or not, the operation of detecting the powder outside the hole is simple and convenient, and the detection accuracy is high. And the surface of the concrete structure cannot be greatly damaged.

The invention relates to the technical field of polymeric membrane separation, in particular to a phenolphthalein-based polybenzoxazole membrane as well as a preparation method and application thereof. The invention provides a phenolphthalein-based polybenzoxazole membrane which has a structural formula as shown in a formula I. A polymer is synthesized by adopting a one-step method, esterification crosslinking and thermal rearrangement methods, phenolphthalein-based diamine is selected as one of diamine monomers, phenolphthalein-based diamine contains a large number of benzene rings, and the thermal stability of the polymer can be improved; the monomer contains a-COOH group and can be crosslinked through an ester group, so that the polyimide film keeps good mechanical properties under the condition that the plasticizing resistance is improved; meanwhile, the monomer also contains phenolic hydroxyl groups, so that a thermal rearrangement reaction can be further carried out after esterification crosslinking of a polyimide film, and a polybenzoxazole film with a more distorted and more rigid structure is formed.

The invention discloses a low-dielectric-loss hydrocarbon resin glue solution for a copper-clad plate and a preparation method of the low-dielectric-loss hydrocarbon resin glue solution, and relates to the technical field of copper-clad plates. 1, 2-polybutadiene and a hydrogenated styrene-butadiene block copolymer are compounded to guarantee low dielectric loss; hydrocarbon resin is introduced into a cyanate ester-bismaleimide-benzoxazine resin system to prepare a composite resin system, bisphenol A cyanate ester is pre-polymerized under catalysis of zinc acetylacetonate, a triazine ring structure is formed through trimerization, the glass transition temperature is increased, the dielectric constant is reduced, phenolphthalein polyarylether sulfone improves toughness and impact strength, and the dielectric constant is reduced. Bismaleimide is added to improve the adhesive force and thermal stability, and benzoxazine is subjected to ring-opening polymerization to provide phenolic hydroxyl groups and secondary amine which participate in crosslinking to form a low-dielectric thermosetting network. The modified ammonium polyphosphate and the silica powder form a heat insulation layer, phosphorus-silicon synergistic flame retardance is formed, and UL-94V-0-level flame retardance is achieved. The copper-clad plate provided by the invention is especially suitable for the high-end fields of 5G high-frequency copper-clad plates, aerospace thermal protection coatings and the like.

The invention discloses cross-linking type polyaryletherketone resin and a preparation method and application thereof, and the cross-linking type polyaryletherketone resin comprises polyaryletherketone resin and a dihydroxyl cross-linking agent as shown in a structural formula (I). In the structural formula (I), R1-R8 are respectively and independently hydrogen or alkyl with less than 10 carbons. The polymerization degree of the polyaryletherketone resin is 30 to 700. The polyaryletherketone resin is at least one of polyether ketone, polyether ether ketone, polyether ketone ketone, polyether ether ketone ketone, polyether ketone ether ketone ketone and phenolphthalein polyaryletherketone. The cross-linked polyaryletherketone resin provided by the invention is easy to melt and process and high in thermal deformation temperature, and a sealing element made of the cross-linked polyaryletherketone resin has excellent thermal stability and high creep resistance, and can maintain mechanical properties for a long time when used in a high-temperature and high-pressure environment.

The application relates to the field of visual detection of metals, and particularly relates to a preparation method, product and application of nitrogen-sulfur co-doped carbon quantum dots. The preparation method of the nitrogen-sulfur co-doped carbon quantum dots comprises the following steps: phenolphthalein, m-phenylenediamine and glutathione are dissolved in an alkali solution to perform a hydrothermal reaction; after the hydrothermal reaction is completed, filtration, dialysis and freeze-drying are sequentially performed to obtain the nitrogen-sulfur co-doped carbon quantum dots. Phenolphthalein is used as a precursor, m-phenylenediamine and glutathione are respectively used as a nitrogen source and a sulfur source to synthesize nitrogen-sulfur co-doped carbon quantum dots (NS-CDs). The preparation method is simple, the quantum yield of the NS-CDs prepared by using the method reaches 71.16%, and the result is higher than that of most reported blue fluorescent carbon dots. The NS-CDs prepared by using the method can be successfully applied in the visual detection of Cr 6+ and Mn 7+ .

The invention discloses a co-extrusion composite film based on medicinal packaging and a preparation method of the co-extrusion composite film, and relates to the technical field of medicinal packaging materials. Comprising a supporting layer, a buffering layer and a blocking layer which are sequentially arranged from outside to inside, the supporting layer is made of polyethylene terephthalate, the buffering layer is made of maleic anhydride grafted polyethylene, and the blocking layer is made of 82-88 wt% of phenolphthalein type polyethersulfone and 5-10 wt% of ethylene-vinyl alcohol copolymer. According to the invention, the ethylene-vinyl alcohol copolymer in the barrier layer is a high-barrier material and has extremely low permeability to gases such as oxygen and carbon dioxide, the phenolphthalein polyethersulfone molecular structure contains rigid sulfuryl and ether bonds and has strong chemical resistance and compact molecular chain piling, so that the moisture resistance can be further improved, and meanwhile, the moisture resistance is further improved. The photosensitization modified carbon quantum dot-nano titanium dioxide compound is subjected to amination and porphyrin grafting, so that the dispersity is better, molecular gaps can be filled, gas and moisture permeation channels are reduced, and the barrier property of the composite membrane is improved.

The application discloses a kind of side group containing halogen diphenol compound and its preparation method and application.The preparation method includes the following steps: step 1, phenothiazine and aromatic primary amine derivative hydrochloride are dissolved in aromatic primary amine derivative, ammonolysis reaction, quenching separation, obtain halogen-containing 2-aryl-3,3-bis (hydroxyaryl) benzopyrrolone derivative crude product;Step 2, the halogen-containing 2-aryl-3,3-bis (hydroxyaryl) benzopyrrolone derivative crude product is purified to obtain the halogen-containing 2-aryl-3,3-bis (hydroxyaryl) benzopyrrolone derivative.The halogen-containing 2-aryl-3,3-bis (hydroxyaryl) benzopyrrolone derivative obtained by the above preparation method is higher than 60%, the purity after purification is higher than 98%, raw material is easy to obtain, process is simple, and it is suitable for industrial production.

The application discloses a low-energy- consumption phenolphthalein polyaryletherketone polymerization process, comprising the following steps: mixing phenolphthalein monomer, 4,4'-difluorobenzophenone monomer and a catalyst in a certain proportion; performing a prepolymerization reaction under low temperature and normal pressure to generate a low-molecular-weight prepolymer; transferring the low-molecular-weight prepolymer into a high-temperature reaction kettle, performing a main polymerization reaction under high temperature and medium pressure, and adding a viscosity-reducing additive in the reaction process; and cooling, crushing, washing and drying the product to obtain a phenolphthalein polyaryletherketone product. The application belongs to the technical field of high polymer material synthesis, and specifically provides a process for solving the problems of high melt viscosity, high energy consumption and low reaction efficiency in the prior art; the process has the advantages of low melt viscosity, low energy consumption, high reaction efficiency and the like, and can significantly improve the production efficiency and quality of the phenolphthalein polyaryletherketone.

The invention belongs to the field of high polymer materials, and discloses a method for preparing a phenolphthalein-based polyaryletherketone nanofiber membrane based on electrostatic spinning of a bio-based cyclic lactone green solvent system. The bio-based cyclic lactone green solvent is adopted as the electrostatic spinning solvent of phenolphthalein polyaryletherketone, a matched process window is matched, green and environment-friendly production is achieved, and the obtained nanofiber membrane is uniform in fiber morphology and excellent in performance and has application prospects in the fields of separation and filtration, energy environmental protection and the like.