2781 results about "Ethyl acetate" patented technology

The invention relates to the technical field of batteries, in particular to a lithium ion secondary battery. The lithium ion secondary battery comprises a negative plate and electrolyte, the negative plate comprises a negative current collector and a negative active layer located on at least one side surface of the negative current collector, the negative active layer comprises a first coating and a second coating which are arranged in the thickness direction of the negative plate, and the first coating is located between the negative current collector and the second coating; the second coating comprises first silicon carbon, and the sphericity degree of the first silicon carbon is 0.8-1; the silicon content of the first silicon carbon is 30%-60%; the average particle size of the first silicon carbon is R1, and R1 is more than 6 microns and less than or equal to 15 microns; the electrolyte comprises a fluorine-containing solvent and a nitrile compound, the fluorine-containing solvent comprises fluoroethylene carbonate and / or ethyl difluoroacetate, based on the total weight of the electrolyte, the content of the fluorine-containing solvent is w1, and w1 is larger than or equal to 30% and smaller than or equal to 70%; the content of the nitrile compound is w2, and 0.4% < = w2 < = 7%. The lithium ion secondary battery provided by the invention has good cycling stability and dynamic performance at high voltage and high temperature.

The invention relates to the technical field of batteries, in particular to a battery. Comprising a positive plate and electrolyte, the positive plate comprises a positive current collector and a coating positioned on the surface edge of at least one side of the positive current collector along the length direction; the coating comprises filling particles, and the filling particles comprise at least one of inorganic particles and nitrogen-containing particles; the electrolyte comprises non-fluorinated cyclic carbonate and fluorinated ethyl acetate; the non-fluorinated cyclic carbonate comprises propylene carbonate and optional ethylene carbonate; on the basis of the total mass of the electrolyte, the content ratio C1 of the non-fluorinated cyclic carbonate is smaller than or equal to 25%, the content ratio C11 of the propylene carbonate is 3.1%-24.9%, the content ratio C12 of the ethylene carbonate is 0%-5%, and the content ratio C2 of the fluorinated ethyl acetate is 20.2%-70%. The battery provided by the invention can improve the problem of lithium precipitation under low-temperature discharge, and has relatively good short-circuit safety performance and relatively low high-temperature gas production rate.

The invention relates to the technical field of intelligent monitoring, in particular to a Baijiu brewing microbial fermentation intelligent monitoring system and method.The Baijiu brewing microbial fermentation intelligent monitoring system comprises a multi-source sensing module, an edge computing unit, a cloud decision-making model, a dynamic execution unit, an AR visual terminal and a safety early warning module, the multi-source sensing module is used for acquiring temperature gradient, material components and microorganism density data in the fermentation tank; the edge calculation unit is used for implementing space-time fusion processing on the original data; the cloud decision model adopts a hybrid neural network, fuses real-time monitoring data and a historical fermentation atlas database, and outputs an ethyl acetate generation efficiency predicted value and a regulation and control instruction; the dynamic execution unit is used for receiving the regulation and control instruction; the AR visual terminal is used for dynamically displaying the fermentation process three-dimensional thermodynamic diagram and labeling the concentration extreme point of the target metabolite; the safety early warning module is used for starting an emergency program. Therefore, the problems of non-real-time monitoring, non-intelligent data processing, insufficient control precision, low safety and the like in related technologies are solved.

The invention discloses a shielding protection adhesive tape for semiconductor integrated circuit packaging and a preparation method thereof, and relates to the technical field of semiconductor integrated circuit packaging. The shielding protective adhesive tape for packaging the semiconductor integrated circuit is prepared by taking polyimide as a base material and coating a coating, and the coating comprises the following raw materials in parts by weight: 3-5 parts of modified nano silicon dioxide, 30-40 parts of N, N-dimethylformamide, 1-3 parts of a curing agent and 1-3 parts of a curing agent. The invention discloses a high-temperature-resistant epoxy resin coating which is prepared from the following components in parts by weight: 25-30 parts of N, N-dimethylformamide, 25-30 parts of a modified acrylate copolymer, 17-26 parts of ethyl acetate, 12-15 parts of epoxy resin, 1-2 parts of a silane coupling agent KH-550, 0.5-1 part of an antioxidant 1010, 0.3-0.8 part of an ultraviolet absorbent UV-327, 1-2 parts of carboxyl-terminated nitrile rubber, 2-4 parts of decabromodiphenyl ether, 0.1-0.3 part of an organic siloxane defoaming agent, 0.2-0.5 part of an acrylate flatting agent and 10-11 parts of diaminodiphenyl sulfone. The adhesive tape contains the modified nano silicon dioxide, the modified acrylate copolymer and other components, so that the performance of the adhesive tape is guaranteed; pretreatment is meticulous, preparation steps are standard, and mass production is easy; a finished product can be effectively shielded, and the packaging yield and the product stability can be improved.

The invention provides a perovskite thin film and a preparation method thereof, and belongs to the technical field of perovskite thin films, and the preparation method comprises the following steps: S1, preparing modified octa (aminophenyl trioxosilane); s2, preparing a precursor solution; and S3, spin-coating the pretreated substrate with the precursor solution, dropwise adding ethyl acetate at the same time, performing illumination treatment under ultraviolet light, and then immediately performing micro-vibration and curing annealing on the substrate to obtain the perovskite thin film. According to the perovskite thin film obtained by the invention, the purposes of synchronously increasing the open-circuit voltage and the filling factor of a solar cell, improving the photoelectric conversion efficiency and enhancing the long-term stability can be achieved.

The invention relates to the technical field of films, in particular to a flexible film special for a handwriting board and a preparation method of the flexible film. The flexible film is obtained by coating a release film with coating slurry and carrying out thermocuring, wherein the coating slurry contains modified polyurethane, a flatting agent, a defoaming agent and ethyl acetate. According to the modified polyurethane, polycarbonate diol, isophorone diisocyanate and other raw materials are subjected to a reaction, and a nano particle chain extender containing disulfide bonds is added. The nano particle chain extender containing disulfide bonds is prepared by modifying nano silicon dioxide and grafting cystamine dihydrochloride and diamino polyethylene glycol. Through nanoparticle surface modification and dynamic disulfide bond network construction, molecular-level coupling of a rigid reinforced phase and a flexible substrate, inhibition of nanoparticle aggregation and balance of strength and toughness are realized, the dynamic disulfide bond network can self-repair microcracks, and a high-quality special flexible film solution is provided for a high-performance handwriting board.

The invention provides a wear-resistant, transparent, flexible and fluoride-free super-hydrophobic composite coating and a preparation method thereof. The preparation method comprises the following steps: mixing hydroxyl-terminated polydimethylsiloxane, gamma-aminopropyltriethoxysilane and dibutyltin dilaurate for reaction to obtain a modified precursor solution, adding swelled epoxy resin into the modified precursor solution, and heating for reaction to obtain siloxane modified epoxy resin; the preparation method comprises the following steps: dispersing nano silicon dioxide in an ethyl acetate solution to form a SiO2 suspension; and uniformly mixing the modified epoxy resin with a SiO2 suspension, adding polyether amine as a curing agent, stirring and mixing, and constructing the epoxy resin / hydroxyl-terminated polydimethylsiloxane / nano-silica super-hydrophobic coating on a substrate by adopting an air spraying mode. According to the preparation method disclosed by the invention, the super-hydrophobic coating with excellent transparency and flexibility and good adhesive force and wear resistance can be prepared, and the super-hydrophobic coating has a wide application prospect in the fields of wearable electronic equipment, photoelectric devices and the like.

The invention is applicable to the technical field of daily cleaning chemicals, and provides a double-shell probiotic microcapsule which comprises probiotics, a fat-soluble plant extract, cellulose nanocrystals, a polyacrylic acid-chitosan compound, a surfactant, diisocyanate, polyethylene glycol and ethyl acetate. A wall material of the microcapsule is formed by compounding a polyacrylic acid-chitosan compound and a fat-soluble plant extract, the particle size D50 is smaller than or equal to 5 microns, the microcapsule is stable in an environment with the pH being 8-10, and the microcapsule is broken to release probiotics when the pH is smaller than or equal to 6. The outer layer is polyacrylic acid / chitosan compound / polyurethane crosslinking (pH response), the inner layer is coconut oil and soybean oil (fat-soluble core), meanwhile, the material preparation process is simple, the controllable degree is high, and the material is suitable for batch preparation.

The invention discloses a fluoride-free waterproof sound-transmitting film and a preparation method thereof, and the fluoride-free waterproof sound-transmitting film comprises the following components in percentage by mass: 30-40% of a fluoride-free polymer; 4.5%-11.5% of a fluoride-free waterproof agent; 0.5%-3.5% of a cross-linking agent and 45%-65% of a solvent; the solvent is a mixed solvent of N 'N-dimethylformamide, N' N-dimethylacetamide, acetone and ethyl acetate, and the mass ratio of the amide solvent in the mixed solvent is 60%-85%; the preparation method of the fluoride-free waterproof sound-transmitting film comprises the following steps: preparing a spinning solution; carrying out electrostatic spinning by utilizing electrostatic spinning equipment to obtain a continuous and uniform nano spinning membrane; the method comprises the following steps: uniformly depositing nanofibers on a nano spinning film base material, and carrying out post-treatment to obtain a finished product of the fluoride-free waterproof sound-transmitting film, the fluorine-free safe and healthy product with good water resistance and air permeability, high rebound resilience and excellent acoustic performance is successfully prepared through selection of raw materials, preparation of a spinning solution, spinning process parameters and fine regulation and control of post-treatment conditions.

The invention discloses a method for synthesizing electronic-grade ethyl acetate through catalytic esterification of acidic ion exchange resin, and belongs to the technical field of ethyl acetate preparation. The method comprises the following steps: mixing crosslinked polystyrene white balls and a swelling agent, and dropwise adding concentrated sulfuric acid for reaction to obtain S-PS resin; mixing an EDTA disodium salt saturated solution and a polyacrylic acid solution, adding a cross-linking agent and an emulsifier, and carrying out a cross-linking curing reaction to obtain EDTA microcapsules; the preparation method comprises the following steps: dispersing S-PS resin in a solvent, adding EDTA microcapsules, a dehydration condensation agent and a catalyst, reacting under the protection of inert gas, and filtering and recovering after the reaction is finished to obtain S-PS-EDTA resin; mixing glacial acetic acid, absolute ethyl alcohol and S-PS (at) EDTA resin for reaction, and filtering and collecting liquid after the reaction is finished; and rectifying the collected liquid to obtain the product. According to the method provided by the invention, metal impurities can be chelated in the synthesis process, and the electronic-grade ethyl acetate with high purity and low impurity content is produced.

The invention relates to the technical field of lithium batteries, in particular to a low-temperature electrolyte and a lithium battery containing the low-temperature electrolyte, the low-temperature electrolyte comprises the following components in percentage by mass: 75-85% of solvent, 11-18% of electrolyte salt and 0.5-2% of additive, the electrolyte salt comprises one or more of lithium hexafluorophosphate, lithium difluoro (oxalato) borate, lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethanesulfonyl) imide, and the additive comprises a film-forming agent, a low-temperature reinforcing agent and a dendritic crystal inhibitor. By optimizing the synergistic effect of the solvent system and the electrolyte salt, the freezing point and viscosity of the electrolyte are effectively reduced, the migration rate of lithium ions at low temperature is enhanced, and it is ensured that the battery can still be efficiently charged and discharged under the low-temperature condition.

The present invention relates to the technical field of seawater desalination membranes, and discloses a durable seawater desalination membrane and a preparation method thereof. The present invention uses pentaerythritol as an initiator, uses propylene oxide and ethylene oxide as raw materials to synthesize a hyperbranched polyether, and then undergoes an ester exchange reaction with 2-aminoethyl acetate to synthesize a modified hyperbranched polyether. The ZIF-8 material is then synthesized by a hydrothermal method, and MoS2 nanosheets are coated on its surface to obtain a MoS2 / ZIF-8 composite material, which is then surface-modified by a silane coupling agent to obtain a modified MoS2 / ZIF-8 composite material. Finally, a casting solution is formed using polysulfone and a modified MoS2 / ZIF-8 composite material to obtain a base membrane, and the base membrane is then sequentially immersed in an aqueous phase solution and an oil phase solution to form a polyamide film layer, thereby obtaining a durable seawater desalination membrane. The seawater desalination membrane prepared by the present invention has excellent water flux, desalination rate and durability.

The invention discloses an explosive granulation system based on nitrogen circulation, the explosive granulation system comprises an enclosed hood, a granulation main machine, a material receiving device and a conveying device, the output end of the granulation main machine, the material receiving device and the conveying device are all located in the enclosed hood, and an oxygen sensor is arranged in the enclosed hood; an air inlet and an air outlet are formed in the closed cover, the air outlet is sequentially communicated with the first wind power supply device, the condenser, the first heater, the second wind power supply device and the air inlet, an outlet of the nitrogen cylinder is further communicated between the condenser and the first heater, and the air inlet and the air outlet are provided with a first temperature sensor and a second temperature sensor respectively. According to the invention, the nitrogen in the nitrogen cylinder can be heated by the first heater and then supplied into the enclosed hood by the second wind power supply device, so that ethyl acetate in the enclosed hood is absorbed and supplied to the condenser by the first wind power supply device, and the ethyl acetate carried by the nitrogen is condensed and recovered; further, ethyl acetate is removed in the press-fitting explosive granulation process.

The invention belongs to the technical field of antibacterial active microorganisms, and particularly relates to a strain of diffusion carbon pad bacteria LUCF 4343-3, a bacterial agent and application of the bacterial agent in preparation of an antibacterial preparation. According to the invention, an endophytic fungus strain with remarkable antibacterial potential is successfully separated from Parmotrema, and the endophytic fungus strain is identified as diffusion carbon pad fungus LUCF 4343-3. Experiments show that an ethyl acetate extract of the strain shows a good inhibition effect on various clinical common pathogenic bacteria, including gram-positive bacteria (staphylococcus aureus and enterococcus faecalis), gram-negative bacteria (pseudomonas aeruginosa), fungi (candida albicans and candida glabrata) and the like; the discovery provides an important basis for the application of the strain in the development of novel broad-spectrum antibacterial drugs.

The invention provides an analysis method for high-throughput evaluation of tobacco nicotine synthesis capability, and belongs to the technical field of nicotine synthesis capability analys.The analysis method comprises the steps that tobacco seeds are disinfected, germinated and cultured for 14 days to obtain seedlings, the seedlings are transferred to a control medium and an induction medium added with 3 [mu] M of methyl jasmonate to be cultured for 15 days, and the seedlings are obtained; the method comprises the following steps: removing water from an overground part for 15 minutes at 105 DEG C, drying at 65 DEG C until the weight is constant, grinding the overground part into powder, adding a NaOH solution and ethyl acetate containing an internal standard, carrying out vortex mixing uniformly, carrying out ultrasonication for 15 minutes, taking supernate, filtering to obtain sample extract liquor, inputting peak area data into an intelligent prediction model based on a hierarchical weight mechanism, and processing to obtain prediction correction data, the nicotine concentration of a sample is calculated by combining gas chromatography detection with a standard curve, the concentration is corrected by utilizing predicted correction data, finally, nicotine content data is calculated according to the corrected concentration and the dry weight of the sample, and high-precision evaluation of the tobacco nicotine synthesis capability is realized.

The invention discloses an OCA (Optical Clear Adhesive) solution for a folding screen protective film, the OCA solution comprises an optical raw adhesive, a curing agent and a first solvent, the raw adhesive is prepared from the following raw materials in parts by mass: 270-283 parts of 2-ethylhexyl acrylate, 50-62 parts of butyl acrylate, 318-330 parts of methyl acrylate, 40-55 parts of acrylic acid, 1-2 parts of gamma-acryloyloxypropyltrimethoxysilane, 2.1-2.3 parts of an initiator and 1250-1350 parts of a second solvent; the second solvent comprises methylbenzene and ethyl acetate. According to the OCA optical glue solution for the folding screen protection film, raw glue is prepared from the isooctyl acrylate, the butyl acrylate, the methyl acrylate, the acrylic acid, the gamma-acryloyloxy propyl trimethoxy silane and the initiator in a toluene and ethyl acetate compounded solvent system, and an OCA glue layer with excellent stripping force, light transmittance, holding power and bending resistance is obtained after curing; and the cost of the raw materials is optimized, and the method is more economical.

The invention discloses a superfine high-strength meta-position aramid fiber and a preparation method thereof, and the superfine high-strength meta-position aramid fiber is obtained by adjusting the type of a wet spinning coagulating bath and reducing the temperature of the coagulating bath to realize super-stretching. Ethyl acetate and dimethylacetamide are used as a coagulating bath, and meanwhile, the temperature of the coagulating bath is reduced, so that the coagulating speed of the fiber in the coagulating bath is slowed down, the intermolecular force of the fiber is stronger, a more stable network gel state is formed, and very excellent stretchability is achieved. The meta-position aramid fiber prepared by the method has the advantages that the diameter is as small as 1.43 mu m, the tensile rate can reach 8000 times, the breaking strength reaches 1332 MPa, and the elongation at break is more than 20%.

The invention provides a hole transport layer precursor solution, a hole transport layer, a preparation method and application of the hole transport layer, and a perovskite cell, and belongs to the technical field of hole transport layers. The hole transport layer precursor solution comprises a self-assembled single molecule and an organic solvent; the organic solvent comprises a solvent A, a solvent B and a solvent C; the solvent A comprises more than one of a phosphate ester solvent and an alcohol ether solvent; the solvent A contains four hydrogen bond receptors; the boiling point of the solvent A is 215-290 DEG C; the solvent B comprises more than one of ethanol, isopropanol, normal propyl alcohol, butanol, ethylene glycol and N, N-dimethylformamide; the solvent C comprises more than one of ethyl acetate and normal hexane. A ternary hydrogen bond network is formed through the solvent A, the solvent B and the solvent C, the agglomeration degree of SAM molecules is remarkably reduced, and the device performance is improved.

The invention belongs to the technical field of 4-BMA mother liquor recycling, and relates to a method for recycling 4-BMA in mother liquor by adopting a membrane treatment technology, which comprises the following steps: dropwise adding isopropylamine into 4-BMA refining wastewater, adjusting the pH value to 8-9, selecting a proper filter membrane, and filtering by using membrane filtering equipment at a certain temperature to obtain concentrated liquor and permeate liquid; the maximum separation effect is achieved by controlling the volume ratio of the permeate to the concentrated solution, and the 4-BMA isopropylamine salt concentrated solution is obtained; ethyl acetate is added into the 4-BMA isopropylamine salt concentrated solution for extraction, then 13.5 wt% hydrochloric acid is dropwise added for crystallization, and a 4-BMA product is obtained. According to different solubility of 4-BMA, isomer and isopropylamine after salification in water, the isomer salt is dissolved in water to be removed, 4-BMA salt with high purity is obtained, qualified 4-BMA with the purity larger than or equal to 98.00% is obtained through acid adjustment, and the purity of 4-BMA is larger than or equal to 98.00%. The method is low in energy consumption, simple in process, simpler to operate and easier to convert.

The invention relates to the technical field of repair materials, and particularly discloses an extracellular matrix fiber material as well as a preparation method and application thereof. The invention discloses a preparation method of an extracellular matrix fiber material. The preparation method comprises the following steps: taking animal tissues, and carrying out virus inactivation, decellularization and antigen removal, degreasing, drying, grinding and sterilization; the decellularization and antigen removal method comprises the following specific steps: sequentially soaking a sample with a surfactant solution for h; then, soaking treatment is carried out by adopting a salt-alkali solution which contains 0.05-3 mol / L of salt and has the pH value of 8-11; then carrying out soaking treatment by adopting a 0.1-1wt% enzyme solution; and in degreasing, one or more of normal hexane, trichloromethane, dichloromethane, methanol, ethanol, acetone, diethyl ether and ethyl acetate are used for soaking the sample. According to the technical scheme, the ECM powder particle material with high growth factor content is prepared.

The invention discloses an optical stealth color radiation refrigeration coating as well as a preparation method and application thereof, and relates to the technical field of optical stealth materials. The coating is prepared from the following raw materials in percentage by mass: 30 to 50 percent of nano-particles wrapped by fluorescent silicon dioxide shells, 30 to 35 percent of polydimethylsiloxane, 5 to 10 percent of auxiliaries and 30 to 40 percent of ethyl acetate, wherein the sum of the mass percent of all the components is 100 percent; according to the invention, the organic fluorescent dye is doped in the mesoporous silica and is coated with the silica shell, so that not only is the fluorescence aggregation quenching effect of the organic dye avoided and the maximum fluorescence intensity of the dye improved, but also the silica shell layer at the outer layer also plays a role of a protective layer; oxidation of ultraviolet rays, solvents and oxygen to the dye is shielded, and the light stability of the dye is improved.

The invention discloses a synthesis process of vitamin C ethyl ether, and belongs to the technical field of vitamin C derivative synthesis. The process comprises the following steps: taking L-ascorbic acid as a raw material, adding acetone, anhydrous cupric sulfate and acetyl chloride, and reacting for 1-2 hours at 38-40 DEG C under the protection of nitrogen to obtain a vitamin C protector; adding alkali, water, an alkylating reagent and absolute ethyl alcohol into the reaction product, reacting for 3 hours at 75-78 DEG C under the protection of nitrogen, and performing reduced pressure distillation to obtain a vitamin C protector etherate; and finally, hydrolyzing by using cationic resin, removing a protecting group, and recrystallizing by using ethyl acetate to obtain the vitamin C ethyl ether. Through the synergistic catalysis of anhydrous cupric sulfate and acetyl chloride, the reaction time is remarkably shortened, and the product purity and yield are improved. Through detection, the product purity is more than 99.5%, the total yield can reach more than 80%, and an efficient and economical method is provided for industrial production of vitamin C ethyl ether.

The invention relates to the technical field of ferula asafetida endophytic fungus strain separation and purification, in particular to an alkaloid component in pleurotus nebrodensis as well as a preparation method and application thereof, and the alkaloid component in pleurotus nebrodensis, namely an alkaloid compound in pleurotus nebrodensis, is prepared by the following steps: crushing pleurotus nebrodensis sporocarp, adding methanol, heating, refluxing and extracting; dispersing the pleurotus nebrodensis total extract into a suspension with water, and extracting to obtain a petroleum ether part and ethyl acetate part extract; and carrying out gradient elution on the ethyl acetate part extract by silica gel column chromatography, and separating and purifying the third fraction by high performance liquid chromatography to obtain the alkaloid compounds in pleurotus nebrodensis. The invention discloses the alkaloid component in the pleurotus nebrodensis, namely the pleurotus nebrodensis alkali C for the first time, and the pleurotus nebrodensis alkali C has a certain inhibition effect on HGC-27 cells, so that the alkaloid component in the pleurotus nebrodensis, namely the pleurotus nebrodensis alkali C, can be applied to the preparation of tumor prevention drugs and antitumor drugs.

The invention belongs to the technical field of daily chemical products, and particularly relates to a gardenia extract as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing cape jasmine powder (cape jasmine pollen or cape jasmine fruit powder) with an extraction solvent (water or an alcohol solution), extracting to obtain a water extract or an alcohol extract, and sequentially extracting the alcohol extract by petroleum ether, dichloromethane, ethyl acetate and n-butyl alcohol to obtain the cape jasmine extract. A petroleum ether extract, a dichloromethane extract, an ethyl acetate extract, an n-butyl alcohol extract and a water extract are obtained respectively. The gardenia extract prepared by the invention has obvious anti-oxidation, moisturizing and anti-allergy effects, and a scientific basis is provided for subsequent development of daily chemical products with anti-oxidation, moisturizing and anti-allergy effects by utilizing gardenia.

The invention relates to the technical field of biological medicine, and discloses an aromatic polyketone compound as well as a preparation method and application thereof. According to the aromatic polyketone compound, a compound I and a compound II are separated from an ethyl acetate extract of rice fermentation liquor of Crystalomyces hyricus, and the compound I and the compound II are respectively named as Crystaloketide A and Crystalomycin D. In-vitro anti-cancer activity tests are carried out on the Crystaloketide A and the Crystalomycin D. According to the aromatic polyketone compound disclosed by the invention, the anti-cancer activity of the Crystaloketide A and the Crystalomycin D. Results show that the compound I and the compound II have the effects of inhibiting human cervical cancer cells, human liver cancer cells, human nerve cancer cells and human pancreatic cancer cells respectively, so that the compound I and the compound II can be further prompted to be used for preparing anti-cancer drugs.

The invention relates to the field of phosphorus-nitrogen flame retardants, and discloses a preparation method and application of a novel phosphorus-containing nitrogen oxide flame retardant, the preparation method comprises the following steps: S1, under the protection of nitrogen, dissolving diphenylphosphinyl hydroxylamine and triethylamine in a tetrahydrofuran solvent to prepare a reaction substrate solution; s2, slowly dropwise adding a diphenylphosphinyl chloride solution into the solution, and then sufficiently carrying out the reaction in a staged heating and heating reflux mode; s3, cooling and filtering to remove solid byproducts generated by reaction, and concentrating filtrate to obtain a crude product solid; and S4, recrystallizing and purifying the crude product by using ethyl acetate, and finally heating and drying the obtained crystal under a vacuum condition to obtain the product. An N-O group is innovatively introduced into the molecular structure of the flame retardant, so that the effect of efficiently capturing gas-phase free radicals in cooperation with a phosphorus-containing group is achieved, and the substantive technical progress that the material can be endowed with excellent flame retardant property with extremely low addition amount is realized.

The invention relates to the technical field of protective coatings, and discloses a metal roof rust removal self-cleaning waterproof coating which comprises the following components in percentage by weight: 50%-60% of modified acrylic resin, 10%-15% of zinc-doped titanium dioxide nanoparticles, 6%-12% of hydrophobic silicon dioxide, 10%-16% of magnesium-aluminum layered double hydroxide and 2%-4% of zinc phosphate. The invention also discloses a preparation method of the metal roof derusting self-cleaning waterproof coating, which comprises the following steps: S1, the weighed modified acrylic resin is placed in a reaction kettle, and the solvent accounts for 30-50 wt% of the mass of the resin and is ethyl acetate or acetone. Through combination of zinc-doped titanium dioxide, magnesium-aluminum layered double hydroxides, zinc phosphate and hydrophobic silicon dioxide, multiple anti-corrosion, self-cleaning and super-hydrophobic waterproof functions are realized, and meanwhile, a silane coupling agent and a polyurethane prepolymer improve adhesive force and flexibility, so that the coating is durable in a severe environment.

The invention relates to the technical field of indole alkaloid compounds, in particular to indole pleurotus nebrodensis alkali A, a preparation method thereof and application of the indole pleurotus nebrodensis alkali A to preparation of drugs for preventing and resisting tumors. Pleurotus nebrodensis sporocarp is smashed, ethyl alcohol is added, heating reflux preparation and concentration are conducted, obtained pleurotus nebrodensis total extract is dispersed into suspension with water, and then the suspension is placed in a drying oven to be dried to obtain the indole pleurotus nebrodensis alkali A. The indole pleurotus nebrodensis alkali A is obtained. The method comprises the following steps: sequentially extracting with petroleum ether, dichloromethane and ethyl acetate, concentrating an extracting solution to obtain ethyl acetate part extract, carrying out gradient elution separation on the ethyl acetate part extract by silica gel column chromatography, carrying out gradient elution on the obtained third fraction by high performance liquid chromatography, purifying and separating, and collecting eluate to obtain the indole pleurotus nebrodensis alkali A at 16.3 minutes. The indole pleurotus nebrodensis alkali A is disclosed for the first time, and it is found through in-vitro antitumor pharmacodynamic experiments that the indole pleurotus nebrodensis alkali A has a certain inhibition effect on human HGC-27 gastric cancer cells, so that the indole pleurotus nebrodensis alkali A can be used for preparing drugs for preventing and resisting gastric cancer.