2314 results about "Dichloromethane" patented technology

The invention discloses a method and a device for synthesizing a metal precursor organic carbonyl cobalt compound, which are particularly suitable for synthesizing and preparing dicarbonyl cyclopentadienyl cobalt and (3, 3-dimethyl-1-butyne) hexacarbonyl cobalt. The method comprises the following steps: S01-S07, weighing the following raw materials: 120 parts of activated carbon, 250 parts of water, 3-9.1 parts of gold chloride, 118.9-129.8 parts of cobalt salt, a 40%-80% hydrazine hydrate aqueous solution, a 30% sodium hydroxide aqueous solution, 500 parts of dichloromethane and 69.4 parts of a cyclopentadiene monomer; the preparation method comprises the following steps: adding activated carbon, gold chloride, cobalt salt and water into a reaction kettle, starting stirring, controlling the temperature at 10-15 DEG C, dropwise adding a 40% hydrazine hydrate aqueous solution, and slowly heating to 50-55 DEG C after dropwise adding; and filtering the reaction liquid, drying the filtered solid, and putting into a reaction kettle. According to the invention, cobalt salt with wide source and low price is used as a raw material to synthesize the carbonyl cobalt compound, and the carbonyl cobalt compound does not need to be synthesized by taking cobalt octacarbonyl with high price and the like as a carbonyl cobalt source to react with corresponding organic matters.

The invention discloses a strong mineral interference and unconventional oily reservoir quantitative fluorescence experiment method which comprises the following steps: selecting a cleaned sample reservoir particle quantitative fluorescence analysis test, and taking a result as an original blank sample QGF index value; repeatedly grinding and thoroughly crushing the cleaned sample until the particle size is less than 30 microns; the standing time of spectroscopically pure dichloromethane is optimized to ensure that hydrocarbons released by the inclusion are fully extracted; a standard slice is manufactured, inclusion retention is observed under a fluorescence microscope, if the inclusion is observed under the microscope, further grinding and soaking are needed, if no inclusion exists, reservoir particle quantitative fluorescence analysis testing is conducted, and the testing result is the mineral QGF index value; and calculating the QGF index value of the inclusion, wherein the QGF index value is the difference value between the QGF index value of the original blank sample and the QGF index value of the mineral. According to the method, interference caused by the fact that mineral fluorescence and calculation errors are not considered in a traditional reservoir particle quantitative fluorescence experiment method is corrected.

The invention relates to the technical field of dispersing agents for ceramics, and discloses a preparation method of a dispersing agent for ceramics, and the novel dispersing agent for ceramics is prepared by taking methoxypolyethylene glycol, bromoacetyl bromide, 4-hydroxyphthalic anhydride, 2, 4, 6-diethanolamine amino-1, 3, 5-s-triazine and the like as raw materials. The polyether polyol contains a plurality of carboxyl groups, has strong interaction with the surface of ceramic powder such as aluminum oxide, has a star-shaped multi-arm polyether molecular chain, can well coat the aluminum oxide powder, can effectively inhibit the growth of crystal nucleus particle size of the aluminum oxide powder, reduces the particle size of the aluminum oxide, and avoids agglomeration and sedimentation of the aluminum oxide; the modified aluminum oxide ceramic powder has good activation degree in solvents such as water, ethanol, dichloromethane or N, N-dimethylformamide and the like, is lower in settling volume and shows excellent dispersing performance.

The invention discloses a synthesis method of a covalent organic framework crystal material at normal temperature, and belongs to the technical field of covalent organic framework synthesis. The synthesis method of the covalent organic framework crystal material at normal temperature comprises the following steps: S1, dissolving an ammonia monomer in a first solvent to obtain an ammonia monomer solution; dissolving an aldehyde monomer in a second solvent to obtain an aldehyde monomer solution; the first solvent or the second solvent is one or two of N, N-dimethylacetamide and dichloromethane; s2, mixing and reacting the ammonia monomer solution, the aldehyde monomer solution, a catalyst and a third solvent to obtain the covalent organic framework crystal material. According to the synthesis method provided by the invention, the covalent organic framework crystal material can be synthesized at a relatively low temperature within a short time.

The invention relates to the technical field of molecular sieves, in particular to a molecular sieve and a preparation method and application thereof in nitrogen separation.The preparation method comprises the steps that a carbonized material and 3-chloropropyltrimethoxysilane are added into methylbenzene, heating is conducted under nitrogen protection till a reflux reaction is conducted for 12-48 h, after the reaction is finished, the room temperature is recovered, filtering is conducted, a product is collected, washing and drying are conducted, and a modified carbonized material is obtained; and adding the modified carbonized material and an ionic liquid into absolute ethyl alcohol, heating to reflux reaction for 12-48 hours, after the reaction is finished, recovering to room temperature, filtering, collecting a product, performing Soxhlet extraction with dichloromethane for 12-48 hours, drying to obtain an immobilized ionic liquid carbonized material, and performing CO2 activation and vapor deposition on the immobilized ionic liquid carbonized material to obtain the molecular sieve. The molecular sieve prepared by the invention has a relatively high specific surface area, and shows excellent performance of selectively adsorbing nitrogen in a methane and nitrogen mixed system.

The invention provides a film stripping liquid and a preparation method thereof. The film stripping liquid is composed of a solubilizer, a metal corrosion inhibitor, a surface leveling agent and an organic solvent. Wherein the solubilizer can be a combination containing benzene series, so that the solubility of the photoresist in an organic solvent can be improved, and the service life of the stripping liquid is prolonged. The surface leveling agent is one or more of 1, 3-propylene glycol, 2-phenyl-1, 3-propylene glycol and 2-amino-1, 3-propylene glycol, and is used for improving the uniformity of the film stripping liquid in the film stripping process and avoiding the uneven concave-convex phenomenon on the surface of the photoresist. The metal corrosion inhibitor can be selected from azole or polyphenol compounds and can inhibit corrosion of metals such as Cu and Ag in the film stripping process; and the organic solvent is a combination of xylene and dichloromethane and is mainly used for dissolving and removing the expanded and fallen photoresist. According to the film stripping liquid provided by the invention, the glue stripping speed can be increased, the glue stripping uniformity can be remarkably improved, in addition, metals can be effectively protected from being corroded, and the corrosion speed of the metals such as Cu and Ag is controlled to be limited below 1 A / min.

The invention belongs to the technical field of new materials, and discloses a polyolefin dissolving agent as well as a preparation method and application thereof. The cleaning agent is composed of modified long-carbon-chain imidazole dinitrile amine salt, modified long-carbon-chain imidazole long-carbon-chain anion salt, betaine salt, imidazole acetate, imidazole long-carbon-chain anion salt, quaternary ammonium long-carbon-chain anion salt, imidazole bis (fluorosulfonyl) imide salt, imidazole hexafluorophosphate and long-carbon-chain anion and cation liquid. Under the condition of 180-210 DEG C, polyolefin (PP or PE) with the molecular weight of 50-8 million can be dissolved by adopting the polyolefin dissolving agent disclosed by the invention, and effective extrusion can be realized by adopting a twin-screw extruder after dissolution. After PP / PE powder is dissolved by adopting the polyolefin dissolving agent disclosed by the invention, sheet casting or spinning is carried out, casting sheets or PP / PE fibers are washed by using ethanol / dichloromethane / hydrocarbon / tetrachloroethylene to remove ionic liquid, and a polyolefin diaphragm or polyolefin fibers can be prepared.

The invention relates to a lithium battery positive electrode slurry, a positive electrode plate, a preparation method and an application, and belongs to the technical field of battery plate processing, the positive electrode slurry comprises a positive electrode active material, a conductive agent, a binder and a solvent; the solvent comprises an amide solvent and dichloromethane, and the mass ratio of the positive active material to the conductive agent to the binder is (70-80): (10-15): (10-15); the mass ratio of the dichloromethane in the solvent is 0.01%-0.5%. The positive electrode plate comprises a positive electrode current collector and a positive electrode coating layer, and the positive electrode coating layer is obtained by coating the surface of the positive electrode current collector with positive electrode slurry. The positive pole piece is applied to the lithium ion battery. The prepared positive electrode slurry is good in uniformity, the coating uniformity of a positive electrode piece is good, the peeling strength of an electrode is remarkably enhanced, and the performance is more excellent in an electrochemical performance test.

The invention relates to the technical field of waste gas purification and separation, in particular to a dichloromethane waste gas purification and recovery system which is mainly characterized in that a first auxiliary mechanism and a second auxiliary mechanism are arranged in a pretreatment device main body and are matched for use, so that good pretreatment work is carried out on purification treatment work of waste gas; the positive effect on improving the working efficiency of the purification treatment system is achieved; a rotating control motor in the first auxiliary mechanism drives a storage connecting cylinder to rotate, the storage connecting cylinder drives a fan-shaped plate body arranged on the side wall of the storage connecting cylinder and an impurity removal cotton swab in the second auxiliary mechanism to rotate, and impurity particles in waste gas are adsorbed and filtered in the process; the influence of solid pollutants such as impurity particles on subsequent treatment work is avoided as much as possible; the solid pollutants such as impurity particles can be separated from the waste gas, meanwhile, the stable operation of the subsequent purification treatment work can be ensured, and the device has a positive effect on improving the purification and recovery work benefits.

The invention provides a pregabalin slow-release type dissolving microneedle patch based on PLGA microspheres as well as a preparation method and application thereof. The method comprises the following steps: dissolving pregabalin and hyaluronic acid in deionized water to form an inner water phase (W1); dissolving PLGA in dichloromethane to form an organic phase (O); performing ultrasonic emulsification on the internal water phase and the organic phase to form W / O primary emulsion; rapidly adding the primary emulsion into an external water phase (W2) containing PVA and NaCl to form a W1 / O / W2 type multiple emulsion, and then carrying out solvent evaporation curing, centrifugal washing and freeze drying to obtain PLGA (at) PG microspheres; and uniformly dispersing the PLGA (at) PG microspheres in a hyaluronic acid solution, adding into a microneedle mold, vacuumizing, centrifuging, drying, and demolding the microneedle to obtain the dissolution type microneedle patch. By optimizing microsphere preparation, drug sustained release and microneedle patch preparation technologies are realized, and an efficient, safe and continuous local delivery platform is provided.

The invention relates to the technical field of ferula asafoetida endophytic fungi separation and purification, in particular to alkaloid compounds in ferula asafoetida endophytic fungi as well as a preparation method and application of the alkaloid compounds in the ferula asafoetida endophytic fungi. And extracting with dichloromethane to obtain dichloromethane part extract, and purifying and separating the dichloromethane part extract by adopting silica gel column chromatography and high performance liquid chromatography to obtain the alkaloid compounds in the endophytic fungi of ferula sinkiangensis. The alkaloid compound in the ferula sinkiangensis endophytic fungi is disclosed for the first time, the compound is subjected to an in-vitro anti-tumor pharmacodynamic experiment, and according to the experiment result, the alkaloid compound has a certain inhibition effect on MCF-7 cells; therefore, the alkaloid compound can be used for preparing the medicine for preventing and treating the breast cancer, and a new medicine is provided for preventing and treating the breast cancer.

The invention discloses a crown ether grafted polyarylether sulfone ion separation membrane as well as a preparation method and application thereof, and belongs to the technical field of ion separation membranes, collaborative optimization is realized through crown ether accurate grafting and ultrathin ordered membrane formation: a main chain of polyarylether sulfone is grafted with 4 '-aminobenzo-12-crown-4 to form an inherent channel adapted to Li, and the specific surface area of the main chain is increased; the ultrathin film is prepared by a water surface spreading method, and the ion transmission path is shortened. Finally, in a LiCl / MgCl system, Liion flux has high selectivity, high permeation-high selectivity cooperation is preliminarily realized, the chemical synthesis step can be amplified to a kilogram level, and after a DPAES-g-CE / dichloromethane solution is dropwise added to the water surface, the DPAES-g-CE / dichloromethane solution is rapidly spread to form a film without precise equipment; the raw materials are industrial-grade monomers and have no toxic residues, the membrane can be recycled and reused through dichloromethane, the equipment cost is reduced by about 90%, and industrialization is easy; the main chain of the polyaryl ether sulfone is high in rigidity and resistant to high temperature and chemical corrosion; crown ether grafting avoids molecular chain agglomeration, and the swelling rate is far lower than that of a traditional sulfonated membrane.

The invention relates to the technical field of functional composite materials, and discloses a preparation method of polylactic acid porous microspheres and application of the polylactic acid porous microspheres in stem cell inoculation, and the preparation method comprises the following steps: (1) dissolving chitosan in an acetic acid aqueous solution, adding bioactive glass nanoparticles, and performing ultrasonic treatment to obtain an aqueous phase solution; (2) dissolving PLGA or PLA in dichloromethane, and adding an emulsifier to obtain an oil phase solution; (3) dropwise adding the water-phase solution into the oil-phase solution to obtain a water-in-oil primary emulsion; (4) dropwise adding the water-in-oil primary emulsion into a PVA aqueous solution to obtain a double emulsion; and (5) stirring the double emulsions, carrying out centrifugal separation, drying, and immersing in a glutaraldehyde solution for cross-linking treatment to obtain the porous microspheres. The porous microspheres are prepared by a double-emulsion solvent evaporation method, and have more uniform pore size distribution and higher biological activity, so that the porous microspheres can be used as an excellent stem cell inoculation carrier to meet the attachment and proliferation of high-proportion cells.

The invention provides a dry powder drag reducer for fracturing fluid and a preparation method of the dry powder drag reducer, and belongs to the technical field of fracturing materials for well drilling, and the preparation method comprises the following steps: dissolving 4-bromobutyryl chloride and N-dodecyl methylamine in acetonitrile, heating and stirring for reaction, adding polyethylene glycol monomethyl ether acrylate and dichloromethane, stirring and purifying in a nitrogen atmosphere to obtain a dry powder drag reducer; a double-tailed hydrophobic monomer is obtained; uniformly mixing the core-shell SiO2 / Fe3O4 composite nanoparticles, an ethanol water solution, KH570 and an ammonia solution, stirring, and purifying to obtain modified SiO2 / Fe3O4; the preparation method comprises the following steps: adding acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate, a double-tailed hydrophobic monomer and modified SiO2 / Fe3O4 into water, uniformly mixing, adjusting the pH value, introducing nitrogen, mixing and stirring, adding an azo initiator, stirring, cooling, purifying, carrying out vacuum drying, and crushing into powder, thereby obtaining the dry powder drag reducer for the fracturing fluid. The drag reducer has certain heat resistance while achieving good drag reduction performance, and can be better applied to fracturing operation in the well drilling process.

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 relates to the technical field of immunochromatography, in particular to a silicon-coated color fluorescent microsphere and a mild preparation method and application thereof.The preparation method comprises the steps that firstly, time-resolved fluorescent dye is synthesized in an ethanol system, then oil-soluble dye, an ethanol water solution and a swelling agent dichloromethane are added, stirring is conducted at the room temperature to enable the dye to be dissolved, and then the silicon-coated color fluorescent microsphere is obtained; and adding ammonia water and a silane coupling agent tetraethyl orthosilicate, reacting overnight, supplementing the ammonia water, gradually adding a coupling agent 3-aminopropyltriethoxysilane, and washing with pure water for several times after the reaction is finished. The particle size range of the prepared color time-resolved fluorescent microspheres is 200-450 nm, the color time-resolved fluorescent microspheres are prepared in a green and mild mode through a one-step method, a surface active agent, a dispersing agent and a surface amino modified silicon dioxide matrix are not used, the high-luminous-intensity binuclear rare earth europium complex and the oil-soluble dye are embedded into the microspheres in the polymerization process, the dye is not prone to leakage, and the color time-resolved fluorescent microspheres are environmentally friendly and environmentally friendly. The method can be used for qualitative and quantitative dual immunodetection in the field of immunochromatography.

The invention relates to the technical field of biomedical materials, in particular to an artificial bone composite material and a preparation method thereof. The preparation method of the artificial bone composite material comprises the following steps: sequentially adding a CaCl2 solution and a NaH2PO4 solution into a collagen solution in proportion. And adjusting the pH value to 7.4, and collecting white jelly. Dispersing the white jelly in distilled water to obtain a colloid I; respectively adding the colloid I and the modified polyether-ether-ketone powder into a dichloromethane solution containing poly-L-lactic acid in proportion to obtain a mixed solution II, and then adding an ethanol solution for precipitation; and removing the precipitate in the mixed solution II to obtain the slurry. Injecting the slurry into a mold to obtain an intermediate I, and soaking the intermediate I in an EDC / NHS ethanol solution for crosslinking; according to the preparation method, the artificial bone composite material with high mechanical strength and good biocompatibility can be prepared, the defect that the biocompatibility and mechanical strength resistance of the artificial bone composite material cannot be obtained at the same time in the prior art can be overcome, and the practicability of the artificial bone composite material is improved.

The invention belongs to the technical field of pharmaceutical analysis, and particularly relates to a method for determining a residual solvent in LXH-2103 by headspace gas chromatography. The determination method comprises the following steps: preparing a blank solution, a reference substance solution and a sample solution, respectively injecting the blank solution, the reference substance solution and the sample solution into a headspace for balancing, injecting the solutions into a gas chromatograph in a headspace sample injection manner, recording a chromatogram, and calculating the content according to a peak area by an external standard method; the residual solvent is absolute methanol, absolute ethyl alcohol, isopropanol, dichloromethane and methylbenzene. The method for determining the residual solvents in the LXH-2103 by using the headspace gas chromatography, provided by the invention, is high in sensitivity, good in repeatability and high in accuracy, and can be used for simultaneously detecting various residual solvents in the LXH-2103, so that the quality of the LXH-2103 is ensured, and the safety of clinical medication is improved.

The invention belongs to the technical field of polycarbonate materials, and particularly discloses a high-strength flame-retardant polycarbonate plastic and a preparation method thereof. The high-strength flame-retardant polycarbonate plastic comprises the following components in parts by weight: 60-80 parts of polycarbonate, 5-10 parts of a flame retardant, 0.1-2 parts of a dispersing agent, 0.1-2 parts of an antioxidant, 3-8 parts of a reinforcing agent and 2-6 parts of a toughening agent, a preparation process of the flame retardant comprises the following steps: adding 1, 10-phenanthroline-4, 7-diamine and triethylamine into dichloromethane, cooling to-5 to 5 DEG C, adding a dichloromethane solution of a compound A in an inert gas atmosphere, stirring to react, and purifying a reaction solution to obtain the flame retardant. The polycarbonate plastic prepared by the invention has excellent mechanical property and flame retardant property.

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 discloses a catalytic combustion catalyst for treating CVOCs (Chemical Volatile Organic Compounds) as well as a preparation method and application of the catalytic combustion catalyst. The preparation method comprises the following steps: (1) impregnating and loading cerous nitrate and trimethyl phosphate on a carrier, drying, and roasting at 600-800 DEG C to form a modified carrier containing a cerous phosphate crystal phase; and (2) impregnating and loading active metal ruthenium on the modified carrier, drying and roasting to obtain the catalyst for treating catalytic combustion of the CVOCs. The catalyst provided by the invention can be used for catalytic combustion degradation of CVOCs such as dichloromethane, chlorobenzene, chloroethylene, dichloroethane, dichloroethylene, oxychloropropane and the like. For catalytic combustion degradation of CVOCs, the catalyst disclosed by the invention can show high activity, high chlorine-resistant stability, low polychlorinated by-product selectivity and thermal stability, and has certain industrial application prospects.

The invention relates to the technical field of fine chemical engineering and flame retardant preparation, and discloses a preparation method of bromo-triazine capable of improving thermal stability, and the preparation method comprises the following steps: mixing phenol, water and dichloromethane, controlling the temperature, and carrying out oxidative bromination reaction to prepare an organic phase containing tribromophenol; then, under the action of an organic amine catalyst, carrying out condensation reaction on the organic phase, liquid caustic soda and cyanuric chloride; after the reaction, washing with water to remove impurities; and in the presence of process water, firstly controlling the temperature at 38-42 DEG C for azeotropic desolvation, then raising the temperature to 85-95 DEG C for high-temperature crystallization and crystal growing, and finally cooling, filtering and drying to obtain the bromo-triazine product. By utilizing the high selectivity of the organic amine catalyst and a two-stage azeotropic crystallization process, the side reaction is effectively reduced, the solvent wrapped in the crystal is eliminated, the prepared product is high in main content and extremely low in volatile component, the temperature can reach 370 DEG C or above when the thermal weight loss is 2%, and the thermal stability is remarkably improved.

The present invention provides a method for preparing a fluorescent sensor array for detecting heavy metal ions, the method comprising: mixing a cetylpyridinium chloride solution with a sodium hydroxide solution, then performing water bath ultrasound, purifying with dichloromethane, and then dialyzing with a dialysis bag to obtain a CPC-CDs solution; adding heavy metal ion solutions of different concentrations to CPC-CDs / XO sensing solutions under two groups of pH environments to obtain a fluorescent sensor array. Also provided is an application for detecting heavy metal ions Cr 6+ , Fe 2+ , Fe 3+ , and Hg 2+ The present invention simplifies the array construction steps by adjusting the pH environment of the system, and effectively improves the lack of affinity between carbon dots and heavy metal ions by adding xylenol, and can simultaneously detect multiple metal ions (Cr 6+ , Fe 2+ , Fe 3+ , and Hg 2+ ), with high sensitivity and good selectivity, is used for the detection of heavy metals in the environment.

The invention provides a cholesteric liquid crystal elastomer-based circular polarization room-temperature phosphorescence dynamic regulation and control method, which belongs to the technical field of optical materials, and comprises the following steps: 1, dissolving a liquid crystal monomer, a chiral agent, a cross-linking agent, a chain extender, a photoinitiator, a catalyst and a room-temperature phosphorescence polymer in a solvent dichloromethane to obtain a liquid crystal polymer solution; evaporating the solvent to obtain a red cholesteric liquid crystal elastomer room-temperature phosphorescent oligomer; 2, carrying out ultraviolet light polymerization on the cholesteric liquid crystal elastomer room temperature phosphorescent oligomer at room temperature to obtain a CLCE-RTP film; and step 3, regulating and controlling the circular polarization phosphorescence asymmetry factor by controlling the tensile deformation degree of the CLCE-RTP thin film. According to the invention, P1, P2 or P3 is doped with the cholesteric liquid crystal elastomer, so that the dynamic reversible regulation of the circular polarization room temperature phosphorescence asymmetry factor between 0.8 and 0.15 is realized.

The invention belongs to the technical field of membrane separation, and relates to a self-repairing type polydimethylsiloxane pervaporation membrane based on disulfide dynamic covalent bonds, which is prepared by adding 4, 4 '-diaminodiphenylmethane into epoxy-terminated polydimethylsiloxane in a nitrogen atmosphere. Self-repairing type polydimethylsiloxane pervaporation membrane material prepared by curing interpenetrating network formed by physically blending disulfide dynamic covalent bond-based self-repairing type polydimethylsiloxane obtained by reflux reaction of dichloromethane solution of 4, 4 '-dithiodiphenylamine and methacrylate-based polydimethylsiloxane and coating polyvinylidene fluoride with self-repairing type polydimethylsiloxane pervaporation membrane material and an ethylene supporting layer. When the pervaporation membrane is subjected to external damage, especially when the pervaporation membrane is scratched by solid substances in the separation process, the pervaporation membrane does not need to be replaced, the repairing function can be achieved only through external heating, no additional solvent is needed in the repairing process, and the method can be used for separating butanol.

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.

The present invention relates to a method for determining the resin content and fiber surface density content of a prepreg, wherein a mixed solvent of dichloromethane and N-methylpyrrolidone is added to the prepreg sample to be tested after shearing treatment, and after 4 ultrasonic treatments, the resin matrix can be effectively dissolved and the fiber can be separated and obtained; the weights before and after the experiment are weighed respectively, and the resin content and fiber surface density content of the prepreg can be determined. The method of the present invention can achieve effective decomposition of resin and fiber, reduce bonding phenomenon in the fiber after cleaning, no white precipitate is seen, fiber loss is reduced, and the stability and accuracy of determining the resin content and fiber surface density content are higher. Compared with the existing method, the number of cleaning times and the amount of solvent used are significantly reduced, the work efficiency is significantly improved, and the processing cost is significantly reduced.

The present invention belongs to the technical field of mechanochromic materials, and specifically relates to a mechanochromic material containing rhodamine with a hydantoin structure, and its preparation method and application. The rhodamine mechanochromic material containing a hydantoin structure is shown in structure (I), with rhodamine B as the matrix, reduced to rhodamine alcohol, oxidized to generate rhodamine aldehyde, and reacted with hydantoin to prepare a six-membered spirocyclic rhodamine containing a hydantoin structure. The rhodamine compound containing a hydantoin structure involved in the present invention has good ion interference resistance, exhibits photochromic properties in a dichloromethane solvent, and has the properties of mechanical stress discoloration and solvent mixing stress discoloration with high contrast and good repeatability. The solid powder of the rhodamine mechanochromic material containing a hydantoin structure has the characteristic of changing color upon grinding. After the action of mechanical force, the color of the powder changes from yellow to pink, and a reversible color change is achieved during the grinding-heating process.

The invention discloses a fluopyram preparation method, which comprises: S1, carrying out a heating reaction on 2-vinyl-3-chloro-5-trifluoromethylpyridine, ammonia water, a catalyst and a solvent, carrying out reduced pressure distillation after the heating reaction to recover the solvent so as to obtain a residue, and adding dichloromethane and triethylamine to the residue so as to obtain a reaction liquid; and S2, dropwise adding o-trifluoromethyl benzoyl chloride into the reaction liquid in an ice bath, then removing the ice bath, stirring at the room temperature, adding water into the reaction liquid obtained in the step S1, extracting an organic layer, drying with anhydrous magnesium sulfate, recovering the solvent under reduced pressure, and performing vacuum drying to obtain the fluopyram. The method has the advantages of high reaction yield, high product purity, recyclable and reusable solvent, simple and mild production process, and suitableness for mass production.

The invention belongs to the technical field of flame retardants, and particularly relates to a preparation method of bromotriazine, which comprises the following steps: adding phenol and deionized water into a reaction container, dropwise adding hydrogen peroxide and liquid bromine into a reaction system in a staggered manner, and adding a catalyst; after the reaction is finished, separating the catalyst, firstly carrying out quenching treatment on the filtrate, then carrying out extraction treatment, and carrying out reduced pressure distillation on the extracted organic phase to obtain tribromophenol; dissolving the prepared tribromophenol in dichloromethane, adding triethylamine and tetrabutylammonium bromide, stirring to form a homogeneous system, adding cyanuric chloride into the homogeneous system, and regulating and controlling the pH in stages; concentrating the organic phase which is washed to be neutral, adding n-hexane to initiate primary nucleation, dropwise adding ethyl acetate to adjust the polarity of the solvent, and promoting crystal growth; and filtering and drying in vacuum to obtain the bromo-triazine. Through staged pH / temperature regulation and control, the composite catalyst system realizes efficient synthesis of bromotriazine.