2186 results about "Acyl chloride" patented technology

The invention provides a PVDF (Polyvinylidene Fluoride) nanofiltration membrane constructed on the basis of microwave-enhanced bridging interfacial polymerization as well as a preparation method and application of the PVDF nanofiltration membrane. The method comprises the following steps: reacting PVDF powder with an organic alkali to prepare a modified film-forming solution, blade-coating the modified film-forming solution on a non-woven fabric supporting layer, placing the non-woven fabric supporting layer in an ethanol-water or methanol-water coagulating bath, and preparing a PVDF supporting film by virtue of assistance of an ice template; weighing the functionalized nano material and an amino silane coupling agent, performing ultrasonic dispersion, and adding a catalyst for reaction to obtain dispersion liquid; immersing a PVDF support membrane into the dispersion liquid to obtain a modified membrane; immersing the modified membrane into an aqueous solution containing an amine monomer and an organic solution containing an acyl chloride monomer, and carrying out microwave radiation. The interface reaction rate and selectivity are enhanced through the microwave excitation effect, and meanwhile, the hydrophilicity and reaction activity of the PVDF base membrane are cooperatively regulated and controlled, so that the separation efficiency and the anti-pollution capacity of the membrane are remarkably improved. The obtained PVDF nanofiltration membrane has high flux, high selectivity and excellent structural stability, and is suitable for efficient purification and resource recovery application in a complex water system.

The invention discloses a desalting membrane as well as a preparation method and application thereof, and relates to the technical field of membrane separation. The desalting membrane comprises a porous ultrafiltration base membrane and a functional layer formed on the surface of the porous ultrafiltration base membrane; the functional layer is formed by copolymerizing and cross-linking a polyamine monomer, a zwitterionic multi-element hydroxyl monomer and an acyl chloride monomer through an interfacial polymerization reaction. The preparation method comprises the following steps: providing the porous ultrafiltration base membrane; coating the surface of the porous ultrafiltration base membrane with an alkaline water-phase solution containing a polyamine monomer and a zwitterionic multi-hydroxyl monomer to form a water-phase solution layer; coating an oil-phase solution containing an acyl chloride monomer on the surface of the water-phase solution layer to form a functional layer; and performing heat treatment. The invention also provides application of the desalination membrane in any one of seawater desalination, brackish water desalination, wastewater treatment and material separation and concentration. According to the invention, zwitter-ion-based multi-hydroxyl monomers are introduced into water-phase monomers to participate in interfacial polymerization, and a super-hydrophilic nano-channel is constructed in a separation layer, so that the water flux and the desalination rate of the membrane are remarkably improved.

The invention relates to the technical field of polyester fibers, and discloses a preparation method of antibacterial modified polyester hollow fibers, which comprises the following steps: by taking nitrilotriacetic acid, thionyl chloride, epoxy chloropropane, eugenol and the like as raw materials, carrying out acylating chlorination reaction, quaternization reaction and esterification reaction to obtain eugenol epoxy quaternary ammonium salt. The preparation method comprises the following steps: carrying out ring-opening reaction on carboxyl groups in graphene oxide and epoxy groups in eugenol epoxy quaternary ammonium salt to obtain modified graphene, uniformly mixing the modified graphene with polyethylene glycol terephthalate, and carrying out a series of steps to finally obtain the antibacterial modified polyester hollow fiber. Eugenol and quaternary ammonium salt are utilized to improve the antibacterial property of the polyester hollow fiber, and graphene is utilized to improve the mechanical property of the polyester hollow fiber. The polyester hollow fiber prepared by the invention has excellent mechanical properties and antibacterial properties.

The invention provides a polyimide multilayer composite membrane material as well as a preparation method and application thereof, and belongs to the technical field of gas separation. According to the method, through collaborative design of a functional support layer, a gradient MOF layer and an ultrathin selection layer structure, the problems of support layer pore seepage, MOF agglomeration, weak interface bonding and the like in an existing composite membrane material are solved. The preparation method comprises the following steps: firstly, carrying out electrostatic spinning on a polyamide acid glue solution, and synchronously introducing dopamine by adopting a chemical imidization method to prepare a functionalized polyimide fiber membrane containing hydroxyl and amino on the surface, so that the mechanical property of a supporting layer and the MOF anchoring capability are remarkably improved; growing MOF layers with different particle sizes on the surface of the fiber membrane by regulating and controlling the concentration gradient of ligand / metal salt and the reaction time, and passivating through a silane coupling agent after each step of growth so as to avoid heterogeneous nucleation and construct a gradient structure; after the MOF gradient layer is subjected to Ar plasma pretreatment to introduce hydroxyl, the ultrathin polyamide selection layer is formed by utilizing interfacial polymerization of fluorine-containing acyl chloride and a macrocyclic amine monomer, and the ultrathin polyamide selection layer is suitable for gas separation work.

The invention discloses an electrolytic adhesive, an electrolytic cotton adhesive tape and a preparation method of the electrolytic adhesive. The electrolytic cotton adhesive tape comprises the following components in parts by weight: 5-10 parts of 1, 1 '-ferrocene diformyl chloride, 10-15 parts of acrylic acid beta-cyclodextrin ester, 3-8 parts of polyethylene glycol diglycidyl ether, 10-20 parts of ionic liquid, 1.5-3 parts of a cross-linking agent, 10-15 parts of tackifying resin and 0.5-1.5 parts of an initiator, and a polymer matrix comprises an acrylic acid-hydroxypropyl acrylate copolymer and acrylic acid-2-ethylhexyl ester. Comprising an adhesive layer and an adhesive tape base layer, the adhesive layer is prepared from the electrolytic adhesive, and the adhesive tape base layer is prepared from acrylic foam; the obtained electrolytic cotton adhesive tape has high initial adhesion and viscosity strength after power-on and power-off re-adhesion.

The invention relates to the field of packaging materials, and discloses low-temperature heat-sealing water-based coated paper and a preparation method and application thereof.The water-based coated paper comprises a base paper layer and a water-based coating, and the water-based coating comprises water-based ethylene-acrylic acid copolymer emulsion, modified nano-silica, a coalescing agent and water; a cardanol derivative is introduced into the water-based ethylene-acrylic acid copolymer emulsion as a functional component; the cardanol derivative is prepared by reacting epoxidized cardanol with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and then grafting with acryloyl chloride. The preparation method comprises the following steps: reacting epoxidized cardanol with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; the modified nano silicon dioxide is prepared by mixing aminated nano silicon dioxide and chitosan and adding a cross-linking agent prepared by grafting phytic acid and ethylene glycol diglycidyl ether. The water-based coating paper prepared by the invention overcomes the defects that the existing BOPP film is not environment-friendly, and the conventional coating paper is high in heat sealing temperature and easy to stick; meanwhile, good mechanical properties, water resistance and flame retardance are achieved.

The invention relates to the technical field of polymer photoelectric materials, in particular to a preparation method of a supramolecular gel electrolyte. The method comprises the following steps: esterifying tetraphenylethylene alcohol and methacryloyl chloride to form tetraphenylethylene methacrylate, and performing staged linear heating polymerization on the tetraphenylethylene methacrylate, 3-(methacrylamido) propyl dimethyl 3-thiopropyl ammonium oxide inner salt, acrylic acid, tetraphenylethylene methacrylate and 4-vinylpyridine under the action of ammonium persulfate to obtain a tetraphenylethylene copolymer. And finally, soaking in a lithium chloride aqueous solution to obtain the supramolecular hydrogel electrolyte. The hydrogel obtained by the invention has high mechanical strength and high ionic conductivity, and is suitable for energy storage devices such as flexible supercapacitors and the like.

The invention relates to an electromagnetic shielding resistant PPS alloy material containing modified carbon nanotubes, and belongs to the technical field of polymer composite materials. The PPS alloy material comprises 70-85 parts of polyphenylene sulfide, 5-15 parts of polyether-ether-ketone or a liquid crystal polymer, 3-8 parts of carbon nanotubes subjected to acyl chloride-amido double-step modification and 5-12 parts of carbon fibers subjected to oxidation treatment, and the carbon fibers subjected to oxidation treatment are covalently connected with the carbon nanotubes subjected to double-step modification. 0.5 to 1.5 parts of a coupling agent, 0.3 to 0.8 part of an antioxidant and 0.2 to 0.6 part of a lubricant. According to the invention, the carbon nanotubes are subjected to surface grafting group modification, and the carbon fibers are subjected to surface oxidation treatment, so that the technical problems that the carbon nanotubes are easy to agglomerate, the interface between the carbon fibers and the matrix is weak, and the shielding efficiency and the mechanical property are difficult to consider are solved, and the carbon nanotubes and the PPS matrix form a composite reinforced structure; the comprehensive improvement of the material in the aspects of electromagnetic shielding, mechanical property, thermal stability and the like is realized.

The invention discloses a polyetherketoneketone high-temperature-resistant wear-resistant non-stick coating and a preparation method thereof. The coating is prepared from the following components in parts by mass: 13 to 30 parts of a resin matrix group (containing 12 to 25 parts of titanium modified polyether ketone ketone resin, 1 to 5 parts of fluorine-free viscous resin and 0.65 to 6 parts of aluminum oxide), 0.5 to 3 parts of a nano reinforced group (containing 0.5 to 3 parts of KH-550 modified nano titanium dioxide, 0.025 to 0.6 part of cerium dioxide and 0.5 to 3 parts of boron nitride) and 62 to 71 parts of an auxiliary agent group. The preparation method comprises the following steps: 1) taking diphenyl ether, paraphthaloyl chloride and isophthaloyl chloride as monomers, and synthesizing titanium modified polyether ketone ketone resins with different viscosities through segmented polymerization (1.5-2.0 hours or 3.0-4.0 hours); 2) respectively preparing a smooth bottom layer water dispersion slurry and a wrinkled surface layer water dispersion slurry; and (3) forming a compact bottom layer and a micro-wrinkle surface layer on the base material by adopting a layered spraying and stepped sintering process (280-320 DEG C, 10-20 minutes). The whole system of the coating is fluorine-free and has temperature resistance gt; the coating has the characteristics of high temperature resistance (350DEG C), wear resistance (Taber wear rate of 3-5mg / 1000r), non-sticking (contact angle gt, 100 DEG C) and heavy corrosion resistance, and is suitable for cooking utensils and chemical equipment.

The invention discloses a preparation method of lithium trifluoromethanesulfinate, and belongs to the field of lithium ion battery materials. The preparation method of the lithium trifluoromethanesulfinate comprises the following steps: 1, mixing trifluoromethanesulfonyl chloride, lithium sulfite, lithium bicarbonate and a first solvent, and heating to react; 2, dissolving the concentrated crude product in a second solvent, and filtering and separating a lithium sulfate solid; and 3, concentrating the filtrate, adding a third solvent, uniformly stirring, filtering and separating the lithium chloride solid, and concentrating to obtain the lithium trifluoromethanesulfinate. According to the method for preparing the lithium trifluoromethanesulfinate, the yield can reach 94%, the operation is simple, byproducts are easy to separate, and the method is suitable for industrial production. In addition, the obtained by-product lithium sulfate can be used for preparing lithium sulfide, the by-product lithium chloride can be used for preparing solid electrolyte, and resource utilization is achieved.

The invention belongs to the technical field of oil well paraffin removal and prevention, and relates to a paraffin removal and prevention agent for a shale oil shaft and a preparation method thereof. The paraffin remover and inhibitor for the shale oil wellbore comprises the following raw materials in percentage by mass: 40-55% of an oily solvent, 1-3% of a cosolvent, 1-2% of imidazole bis (trifluoromethanesulfonyl) imide salt, 10-20% of a wax crystal modifier, 3-5% of an emulsifier, 1-2% of an alkaline regulator and 25-35% of water, wherein the sum of the mass percentages of the raw materials is 100%. The wax crystal modifier is prepared by copolymerizing (methyl) acrylic acid C12-C16 ester, (methyl) acrylic acid C1-C3 ester and (methyl) acryloyl chloride and then reacting with C20-C30 alkyl alcohol. The wax crystal modifier provided by the invention has long-medium-short branched chains, and interacts with the imidazole bis (trifluoromethanesulfonimide) salt capable of improving the paraffin removal effect and low-temperature fluidity, so that the efficient paraffin removal and inhibition effect is realized, and the better paraffin removal and inhibition effect can still be kept at low temperature.

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 a bionic strong acid-resistant nanofiltration membrane and a preparation method thereof, and the bionic strong acid-resistant nanofiltration membrane comprises a porous support layer and an active separation layer formed on the surface of the porous support layer, the active separation layer is a polymer network layer formed by carrying out interfacial polymerization reaction on a water-phase solution containing polyamine and an oil-phase solution containing polyacyl chloride on the surface of the porous support layer. The water-phase solution and / or the oil-phase solution also contains a bionic amphiphilic phosphate compound, the bionic amphiphilic phosphate compound participates in interfacial polymerization reaction through an active functional group in a molecular structure of the bionic amphiphilic phosphate compound, and the phosphate structure of the bionic amphiphilic phosphate compound is covalently connected into a skeleton of the polymer network layer. The preparation method has the beneficial effects that the bionic amphiphilic phosphate compound with a hydrophilic phosphate head, a hydrophobic alkyl tail and a reaction site is synthesized, so that the bionic amphiphilic phosphate compound is spontaneously and orderly arranged on a water / oil interface and participates in interfacial polymerization, the film forming uniformity is improved, the pore size distribution is narrowed, and the intelligent response characteristic is given to the film.

The invention discloses a nanofiber functional dressing for wound healing of burns and scalds, and belongs to the technical field of wound repairing dressings. The dressing is prepared through double-layer electrostatic spinning and comprises a hydrophilic nanofiber layer and a hydrophobic nanofiber layer. The hydrophobic nanofiber layer is prepared by electrostatic spinning of an antibacterial composite modified material and isocyanate-terminated oligomeric lactic acid, and the antibacterial composite modified material is prepared by acylating chlorination of (9I)-2, 4, 8, 10-tetraoxaspiro [5.5] undecane-3, 9-dipropionic acid, reaction of the acylating chlorination product and N, N-bis (2-benzimidazole methyl) amine, and quaternization of benzyl chloride. The tetrooxaspiro rigid structure improves the thermal stability and inhibits the molecular chain from absorbing water and expanding; the quaternized benzimidazole group destroys cell membranes through positive charges, and can efficiently resist bacteria. An amido bond in the hydrophilic layer and a urea bond formed by the antibacterial material and an isocyanate group remarkably improve the liquid absorption capacity; the hydrophobic layer provides mechanical support and ductility; two layers of interfaces are fused through heat treatment, the overall tearing strength is improved, and the joint movement requirement is met.

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 discloses a preparation method of salt-resistant sodium carboxymethyl cellulose, and relates to the technical field of petroleum fracturing materials. The preparation method comprises the following steps: reacting stearic acid with ethylenediamine to obtain a monosubstituted intermediate, reacting the monosubstituted intermediate with cocoyl chloride to obtain an intermediate 1, reacting the intermediate 1 with epoxypropane to obtain an intermediate 2, and reacting the intermediate 2 with paratoluensulfonyl chloride to obtain a hydrophobic intermediate; reacting a sodium carboxymethyl cellulose solution with the hydrophobic intermediate to obtain modified sodium carboxymethyl cellulose, and sulfonating the modified sodium carboxymethyl cellulose with sulfamic acid to obtain crude salt-tolerant sodium carboxymethyl cellulose; and reacting the crude product salt-resistant sodium carboxymethyl cellulose with borax to obtain the salt-resistant sodium carboxymethyl cellulose. The salt-resistant sodium carboxymethyl cellulose prepared by adopting a step-by-step synthesis strategy has excellent salt resistance, temperature resistance, shearing resistance and dissolution rate, and is suitable for thickening and sand carrying of high-temperature and high-salt oil and gas field fracturing fluid.

The invention discloses a method for improving water flux and anti-pollution capacity of a polyamide reverse osmosis membrane and application of the method, and belongs to the technical field of water treatment membranes.The method comprises the steps that a water-phase solution containing polyamine monomers and an oil-phase solution containing polyacyl chloride monomers are respectively subjected to droplet formation into a water-phase solution containing polyamine monomers and an oil-phase solution containing polyacyl chloride monomers through a droplet generator, and the water-phase solution containing polyamine monomers and the oil-phase solution containing polyacyl chloride monomers have the particle size of 10-200 microns; water phase solution droplets and oil phase solution droplets with the specific surface area of 3 * 10 < 4 >-6 * 10 < 5 > m < 2 > / m < 3 > are sequentially sprayed on the ultrafiltration substrate membrane through a moving spray head system, so that the water phase solution droplets and the oil phase solution droplets are fully contacted to generate an interfacial polymerization reaction, and after the spraying process is finished, heat treatment is performed to obtain the polyamide reverse osmosis membrane. According to the method disclosed by the invention, the traditional interfacial polymerization method is improved, a new additive is not introduced, and the water flux and the anti-pollution capacity of the polyamide reverse osmosis membrane are further improved on the basis of reducing the solvent dosage.

The invention belongs to the technical field of membrane separation, and particularly relates to a method for preparing a high-flux hollow fiber nanofiltration membrane based on interfacial polymerization, the obtained membrane and application. The method comprises the following steps: firstly, carrying out pre-adsorption treatment on a polyethersulfone hollow fiber ultrafiltration base membrane through a polyethyleneimine aqueous solution to form a reactive anchoring layer; then sequentially dipping in an aqueous phase solution containing piperazine, sodium phytate and nanoscale cellulose whiskers and an organic phase solution containing trimesoyl chloride and 5-isocyanate isopeptide acyl chloride for interfacial polymerization; and finally, carrying out heat treatment on the obtained primary composite membrane, and completing a gas-phase cross-linking reaction in a glutaraldehyde steam atmosphere. According to the method, the hollow fiber nanofiltration membrane with high flux, high selectivity, excellent chlorine resistance and pollution resistance is successfully prepared through a multi-stage strengthening process, and the hollow fiber nanofiltration membrane is suitable for the fields of drinking water purification, industrial wastewater reuse, material separation and the like.

The invention discloses a crown ether modified nanofiltration membrane for selective separation of lithium and magnesium and a preparation method of the crown ether modified nanofiltration membrane, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: by taking a porous ultrafiltration membrane as a substrate and 2-aminomethyl-18-crown-6 ether and polyamine as water-phase monomers, carrying out interfacial polymerization reaction on the water-phase monomers and trimesoyl chloride on the surface of the porous ultrafiltration membrane to form a polyamide layer; wherein 2-aminomethyl-18-crown-6 ether is introduced into the polyamide separation layer in the form of a covalent bond through a reaction with trimesoyl chloride. The prepared nanofiltration membrane can effectively intercept Mg < 2 + > and provide an exclusive transport channel for Li < + >, so that the Li < + > smoothly crosses the membrane, and the lithium-magnesium separation effect is achieved. The method is simple in preparation process operation, low in energy consumption and easy to amplify, can be used for salt lake lithium extraction, and has a wide industrial application prospect.

The invention belongs to the technical field of semipermeable membrane preparation, and particularly relates to a preparation method of a nanofiltration membrane. The preparation method comprises the following steps: (1) cleaning the supporting layer for later use; the preparation method comprises the following steps: blending diamine, an amino beta-cyclodextrin derivative, an inorganic hybridizing agent, a zwitterionic compound and water to obtain a water phase for later use; blending aromatic acyl chloride, a cosolvent and an organic solvent to obtain an oil phase for later use; and (2) sequentially carrying out primary impregnation in a water phase, membrane scraping, secondary impregnation in an oil phase and heating curing on the supporting layer, and finally carrying out post-treatment to obtain the nanofiltration membrane. The nanofiltration membrane is prepared by introducing the amino beta-cyclodextrin derivative, the inorganic hybridization agent and other components into polyamide, so that the water flux of the polyamide nanofiltration membrane and the capability of effectively separating ions with different valence states are further improved.

The invention discloses a bio-based fiber reinforced composite material and a preparation method thereof, and belongs to the technical field of bio-based fiber composite materials. The bio-based fiber reinforced composite material is prepared from the following raw materials in parts by weight: 60 to 80 parts of nylon 6, 10 to 20 parts of bio-based aramid fiber, 5 to 10 parts of modified carbon fiber, 2 to 6 parts of hyperbranched polyester modified zinc oxide and 1 to 3 parts of antioxidant, the bio-based aramid fiber is prepared by reacting 2, 5-furandicarbonyl chloride with two diamine monomers, and the two diamine monomers respectively contain trifluoromethyl and sulfuryl; the modified carbon fiber is obtained by grafting polyamidoamine on the surface of carbon fiber; the hyperbranched polyester terminal group of the hyperbranched polyester modified zinc oxide contains an epoxy group. The modified carbon fiber, the bio-based aramid fiber and the hyperbranched polyester modified zinc oxide are added into the nylon matrix, so that the composite material is endowed with good ultraviolet resistance, comprehensive mechanical properties and durability.

The invention belongs to the technical field of membrane separation, and particularly relates to a low-pressure high-flux polyamide / polysulfone hollow fiber composite nanofiltration membrane and a preparation method thereof. The preparation method of the composite nanofiltration membrane comprises the following steps: dissolving sulfonated polysulfone, poly (1-vinyl-3-butylimidazole) bromide and polyvinylpyrrolidone to prepare a spinning solution, and spinning to obtain a base membrane; carrying out hydrophilic modification on the base membrane by using 1, 3-propane sultone; then, an aqueous phase solution containing poly (gamma-glutamic acid) and triethylene tetramine and an organic phase solution containing trimesoyl chloride and 3, 5-diaminobenzoic acid are subjected to interfacial polymerization in the inner cavity of the modified base membrane to form a polyamide separation layer; and finally, carrying out heat treatment to obtain the composite nanofiltration membrane. Through the synergistic effect of zwitterionic ionization of the base membrane and biomacromolecule construction of the separation layer, the mass transfer resistance of water is remarkably reduced, unification of high flux and high selectivity is achieved, and good structural stability is achieved.

The invention belongs to the technical field of semipermeable membrane preparation, and particularly relates to a preparation method of a reverse osmosis membrane. The preparation method comprises the following steps: (1) cleaning the supporting layer for later use; blending diamine, a performance additive and water to obtain a water phase for later use; the preparation method comprises the following steps: blending aromatic acyl chloride, a cosolvent and an organic solvent to obtain an oil phase A for later use, and blending a dynamic crosslinking monomer and the organic solvent to obtain an oil phase B for later use; (2) placing a supporting layer at the bottom of a container, uniformly mixing a water phase and a catalyst, and adding the mixture into the container; and adding the oil phase A into a container to carry out primary condensation reaction, adding the oil phase B to carry out secondary condensation reaction after the reaction is finished, and carrying out post-treatment to obtain the reverse osmosis membrane. According to the invention, a Schiff base-benzene ring bridging structure and a dynamic crosslinking imine bond are introduced through a dynamic crosslinking monomer; and dodecyl ethyoxyl sulphobetaine is matched, so that the chlorine resistance and pollution resistance of the reverse osmosis membrane are improved, and meanwhile, the reverse osmosis membrane has good salt rejection rate and water flux.

The invention relates to a preparation method and a preparation device of isocyanate, and the preparation method comprises the following steps: carrying out cold reaction on a phosgene solution and an amine solution in a cold reactor to obtain an intermediate mixed solution; separating the intermediate mixed solution by adopting a cyclone, obtaining a carbamoyl chloride mixed solution from an underflow port of the cyclone, and obtaining an amine hydrochloride mixed solution from an overflow port of the cyclone; the carbamyl chloride mixed solution enters a first thermal reactor for thermal reaction to obtain a first reaction product, and the amine hydrochloride mixed solution enters a second thermal reactor for thermal reaction to obtain a second reaction product; mixing the first reaction product and the second reaction product in a staying reactor to obtain an isocyanate reaction solution; and carrying out post-treatment on the isocyanate reaction liquid to obtain the isocyanate. The method can reduce the generation amount of urea by-products, further inhibits the generation of other subsequent by-products, reduces the chromaticity of the product, and improves the quality of isocyanate.

The invention discloses a polyamide acid-resistant nanofiltration membrane and arsenic removal application thereof in hair dye preparation. According to the amide acid-resistant nanofiltration membrane, a polyamine monomer and trimesoyl chloride are subjected to an interface reaction on an ultrafiltration supporting bottom membrane, and the polyamide acid-resistant nanofiltration membrane containing the Telogen structure is obtained. According to the method for removing the arsenic in the hydroxyethyl diphosphoric acid, a polyamide acid-resistant nanofiltration membrane containing a Troger structure is adopted for at least one time of filtration treatment, the concentration of arsenate in the hydroxyethyl diphosphoric acid after secondary filtration treatment is reduced to 4.60 mg / kg from 480.02 mg / kg, and the arsenic content of the hair dye prepared from the hydroxyethyl diphosphoric acid is smaller than 0.07 mg / kg. According to the polyamide acid-resistant nanofiltration membrane containing the Troger structure, which is obtained by adopting a limited preparation method, the acid resistance is greatly improved, the separation selectivity is higher, arsenic in hydroxyethyl diphosphate can be effectively removed, and the arsenic content in a hair dye is greatly reduced.

The invention relates to the field of cables, and discloses a flame-retardant impact-resistant cable and a preparation process thereof.The cable sheath layer is prepared from low-density polyethylene, nitrile rubber, ethylene-vinyl acetate copolymer, modified halloysite nanotubes and a flame-retardant additive, the preparation method comprises the following steps: carrying out acylating chlorination on 2, 4-dihydroxyphenyl)-2H-benzotriazole, reacting with 3, 5-di-tert-butyl-4-hydroxybenzylamine to prepare a modified acylating chlorination ultraviolet absorbent, and grafting the modified acylating chlorination ultraviolet absorbent with aminated halloysite nanotubes to prepare the ultraviolet absorbent. The aminated halloysite nanotube is prepared by using gamma-aminopropyl triethoxy silane to modify the aminated halloysite nanotube; the flame-retardant additive is prepared from a flame-retardant intermediate obtained by reaction of diphenyl silanediol and phosphorus oxychloride and phosphonitrilic chloride trimer through a precipitation polymerization method. The added modified halloysite nanotube and flame-retardant additive can endow the cable with excellent mechanical properties, aging resistance, flame retardance and heat resistance.

The invention provides a method for preparing polyarylester by interfacial polycondensation, which comprises the following steps: dissolving a diphenol monomer in an alkali solution to prepare a bisphenol salt solution, and dissolving an interfacial catalyst in a bisphenol salt water phase to obtain a water phase; dissolving aromatic dicarboxylic acid acyl chloride in a halogenated hydrocarbon solvent to obtain an organic phase; s2, slowly adding the organic phase obtained in the step S1 into the water phase in a stirring state within 10-60 minutes, and continuously reacting for 10-120 minutes in the stirring state; the product is separated out in the form of precipitate, the precipitated precipitate absorbs the halogenated hydrocarbon solvent, so that a liquid phase main body is water, a solid phase is a muddy product containing the halogenated hydrocarbon solvent, and the obtained muddy product is filtered, washed and dried to obtain a powdery product. According to the method disclosed by the invention, the polymer is directly precipitated by controlling the solute concentration and the mixing ratio, so that the efficient in-situ removal of the solvent is realized, the solvent is directly separated from water through simple filtration, and'zero separation, zero crushing and zero distillation 'is realized.

The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method and application of a high-permeability polyamide reverse osmosis membrane. According to the invention, the problems of high energy consumption and poor water production quality caused by non-ideal flux and rejection rate of the current reverse osmosis membrane product are solved, tetrabutylammonium bromide and acyl chloride form ion pairs to reduce hydrophobicity, a hydrogen bond network of urea destroys a hydrophobic barrier of an organic phase, and migration of acyl chloride to a water phase interface is promoted; the eutectic solvent is adsorbed on a water phase interface to form a'catalytic microenvironment ', amido of an amine monomer is attracted to be close to the interface, and the concentration of a reaction area is increased. During reaction, tetrabutylammonium bromide enables an amine monomer to stably attack a transition state of acyl chloride through electrostatic interaction, and reaction activation energy is reduced; urea and sodium hydroxide in a water phase can be jointly used as an acid-binding agent to neutralize generated hydrochloric acid so as to prevent amido protonation inactivation. The method is simple to operate and suitable for large-scale production.

The invention relates to the field of electric wires and cables, and discloses a high-temperature-oxidation-resistant flame-retardant electric wire and cable and a preparation method thereof.The sheath layer of the electric wire and cable comprises low-density polyethylene, nitrile rubber, natural rubber, ethylene-tetrafluoroethylene copolymer, modified multi-walled carbon nanotubes, modified nano titanium dioxide and auxiliaries; the modified multi-walled carbon nanotube is prepared by reacting an acylating chlorination multi-walled carbon nanotube with a polycyclotriphosphazene derivative; the polycyclotriphosphazene derivative is prepared by reacting hexachlorocyclotriphosphazene with p-aminodiphenylamine and then taking diphenyl dihydroxysilane as a linker; the modified nano titanium dioxide is prepared by the following steps: substituting phenylphosphoryl dichloride with phloroglucinol, then sequentially substituting with 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride and 3-aminopropyltriethoxysilane, and grafting an obtained antioxidant phosphorus-containing coupling agent with nano titanium dioxide. The sheath layer material prepared by the invention has excellent high-temperature oxidation resistance, flame retardance, wear resistance and heat resistance.

The invention provides a preparation method of a polyamide thin-layer composite membrane, which is characterized by comprising the following steps: pretreating a base membrane, and adsorbing amino active groups on the surface of the pretreated base membrane; taking the base membrane out of the solution and then placing the base membrane below a base membrane reaction chamber; carrying out microwave vaporization on an organic phase solution containing polyacyl chloride, introducing the vaporized organic phase solution into a base membrane reaction chamber, and carrying out vapor / liquid interfacial polymerization reaction on the vaporized organic phase solution and the base membrane; and carrying out heat treatment on the reacted membrane material to finally obtain the polyamide thin-layer composite membrane product. According to the preparation method of the polyamide thin-layer composite membrane, provided by the invention, the polymerization process can be more finely controlled, and the structural performance of the membrane can be adjusted. The utilization rate of the solvent is improved, the environmental pollution is reduced, and meanwhile, the high efficiency of the process and the high reproducibility of the result are ensured. The invention also provides a polyamide thin-layer composite membrane and application thereof.