15 results about "Interfacial polycondensation" patented technology

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 application discloses a kind of self-reinforced nylon materials and preparation method thereof, and the self-reinforced nylon material contains the benzocyclobutane structure sensitive to force.By interface polycondensation method, the benzocyclobutane structure is introduced into nylon main chain.When the matrix material is subjected to destructive force, the benzocyclobutane structure unit undergoes ring-opening isomerization, and simultaneously reacts with the bifunctional group crosslinking agent in the matrix material, plays the crosslinking self-reinforcing role.The technical route of the application is simple, the required cost is low, and the prepared nylon material can be used in some engineering plastic application fields with harsh service conditions, and can reduce the risk of component failure.

A method for producing α-amino acid poly(ester amides), poly(ester ureas), and copolymers thereof by interfacial polycondensation comprises the following steps: (a) preparing a first solution by mixing bis(α-amino acid)-, ω-alkylene diester di-p- toluenesulfonate salt, and anhydrous sodium carbonate in water; (b) preparing a second solution by dissolving an aliphatic dicarboxylic acid chloride, or triphosgene, or a mixture of triphosgene with aliphatic dicarboxylic acid chlorides and / or a mixture of triphosgene with aliphatic diisocyanates in methylene chloride; (c) cooling both the first and the second solutions; (d) adding the second solution to the first at a rate of 2350–2400 mL / min under stirring at 680–700 rpm; (e) adding 4.0–4.5 L of distilled water to the resulting reaction mixture in the reactor; (f) adding 10–12 L of distilled water to the polymer solution in the distillation / washing unit while simultaneously performing azeotropic distillation of methylene chloride and washing the polymer; and (g) drying the obtained polymer.

The application discloses a kind of high organic matter removal anti-pollution polyamide reverse osmosis membrane and its preparation method and application, the polyamide reverse osmosis membrane, polyester non-woven fabric layer, polysulfone ultrafiltration support layer, polyamide separation bottom membrane layer and hydrophilic polymer anti-pollution layer are included in sequence;The polyamide separation bottom membrane layer is the crosslinked polymer formed by the interfacial polycondensation reaction of polyamine and polyacyl chloride;The hydrophilic polymer anti-pollution layer is the polymer formed by the crosslinking reaction of diblock hydrophilic polymer comprising pyrrolidone segment and amino segment and small molecular compound comprising epoxy group and / or allyl group.The polyamide reverse osmosis membrane of the application has good application prospect in the field such as organic matter removal in electronic industry pure water, trace organic matter removal in domestic drinking water and the like.

The application discloses a conjugated two-dimensional polymer film and a preparation method and application thereof. The preparation method comprises the following steps: placing a copper substrate in a mixed solution containing an organic monomer and a polar solvent, then adding a ligand and performing an interfacial polycondensation reaction, so as to in-situ grow the conjugated two-dimensional polymer film on the surface of the copper substrate. The preparation method provided by the application can in-situ obtain various conjugated two-dimensional polymer films with different bonding connections on the surface of copper. The prepared conjugated two-dimensional polymer film has adjustable pores, a smooth morphology, a controllable thickness and a strong interlayer pi-pi interaction force, and can be widely applied in selective adsorption and separation, photo / electric catalysis, chemical sensing, organic electronics and other fields. Meanwhile, the conjugated two-dimensional polymer film / metal copper composite material prepared in the application can be directly used as an active electrode and applied in electrolytic water, carbon dioxide reduction electrocatalytic reaction and electrochemical seawater uranium extraction.

The application discloses a kind of crystal porous polymer composite membranes for lithium-magnesium separation and preparation method thereof, and the composite membrane includes a porous substrate film playing a supporting role and a covalent organic framework porous polymer crystal film covered thereon, and the surface defects of the crystal film are covered and plugged by the ultra-thin polymer film generated by interface condensation.The application covers and plugs the gap defects by the interface condensation film means of two reaction monomers at the film defect position of grain gap and growth discontinuity, and the processing mode only needs to immerse the crystal film with defects in aqueous solution and oil phase solution containing reaction monomers in sequence to quickly complete the repair of surface defects, and the method is simple in operation, low in cost and strong in universality.

This invention discloses a method for preparing recycled polyarylate from waste polyester and polycarbonate. The recycling and reprocessing method includes the following steps: (1) Under a protective gas atmosphere, polyester and polycarbonate, along with a catalyst, are mixed uniformly in an alcohol solution, heated, and then catalytically alcoholyzed to obtain diester terephthalate and bisphenol A, respectively. (2) The diester terephthalate obtained from the alcoholysis of diester terephthalate is subjected to acyl chloride treatment to obtain the corresponding terephthaloyl chloride. (3) Finally, without separating the end-capping agent from the recycled monomers, terephthaloyl chloride and bisphenol A are co-polymerized and upgraded to polyarylate under mild conditions using interfacial polycondensation technology. This invention eliminates the need for additional purification techniques to remove the end-capping agent from the recycled monomers, simplifies the waste polymer recycling process, and achieves "upgraded recycling" of polyester and polycarbonate plastics, resulting in better economic benefits.

The present application relates to a kind of determination methods of total chlorine and inorganic chlorine content in polycarbonate resin.In total chlorine content determination, the present application uses a certain concentration of metal hydroxide and carbonate mixed solution to carry out sufficient hydrolysis to the polycarbonate resin to be measured under certain temperature and pressure, and convert various forms of chlorine into sodium chloride for total chlorine detection.In the determination of inorganic chlorine content, the present application fully dissolves inorganic chlorine in polycarbonate by the method of water phase reverse phase extraction and organic phase liquid-liquid extraction.The above detection method converts the measured substance into the detection of chloride ion content in aqueous solution, which can be easily realized by spectroscopy or ion chromatography method, with the advantages of simple operation, good repeatability, high accuracy, etc., and can be used for the determination of chlorine content in polycarbonate product produced by interfacial polycondensation method and production process control.

The invention provides an anti-corrosion wear-resistant self-lubricating composite coating and a preparation method thereof, and is suitable for the technical field of corrosion resistance and wear resistance of the surface of marine equipment. The anti-corrosion wear-resistant self-lubricating composite coating is prepared from the following raw materials in parts by mass: 50 parts of water-borne epoxy resin, 0.5 to 3.0 parts of MXene nanosheets, 5 to 30 parts of SiO2 (at) IL capsules, 50 to 100 parts of a curing agent and 100 to 200 parts of a solvent, the SiO2 (at) IL capsule is a SiO2 shell capsule which is prepared by an emulsion template interfacial polycondensation method and takes ionic liquid as a core material. The anti-corrosion wear-resistant self-lubricating composite coating has excellent heat conduction, tribological and anti-corrosion properties.

The invention discloses a preparation method of a composite fiber blanket, belongs to the technical field of blanket preparation, and is used for solving the technical problem that the heat preservation and moisture permeability and the mechanical property of a fiber blanket in the prior art need to be further improved. Polyphenol-polyamide copolymer fibers and PBS grafted composite fibers are used as a framework and matched with a hybrid functional sizing agent to prepare the composite fiber blanket, the polyphenol-polyamide copolymer fibers are subjected to Schiff base-interfacial polycondensation-drafting shaping to form a stable and fluffy structure, and the PBS grafted composite fibers are subjected to melt grafting and ring opening to endow polarity and resilience. The hybrid functional sizing agent forms a film at the junction with silane sol-gel through epoxy ring opening, so that heat flow path extension, rapid moisture diffusion and effective load transfer are integrally realized, the thermal resistance is improved, the moisture resistance is reduced, the breaking strength and the elongation are synchronously improved, and the hybrid functional sizing agent is suitable for being applied to the warm-keeping blanket.

The application provides a copolymer carbonate resin and a preparation method and application thereof. The copolymer carbonate resin is prepared by an interfacial polycondensation method of phosgene from a copolymer monomer with structures of formula (I) and formula (II). The application controls the concentration of a monomer with the structure of formula (I) in a feeding liquid, so that the relative dielectric constant of the copolymer carbonate resin is reduced, and the resin production efficiency, tensile modulus and bending modulus are improved.

The present invention aims to provide a composite hollow fiber membrane and a method for producing the same that achieve a high level of both organic solvent permeability and solute inhibition performance in an organic solvent-based treated liquid. [Solution] The composite hollow fiber membrane of the present invention comprises an aliphatic polyamide hollow fiber membrane having a dense layer and a support layer, and a separation functional layer containing a crosslinked resin obtained by interfacial polycondensation, wherein the separation functional layer is provided on the surface of the dense layer, and the burst pressure measured under the following conditions is 2.25 MPa or higher. <Burst Pressure> A module fabricated using a composite hollow fiber membrane is subjected to a 0.25 MPa pressure increase at 10-minute intervals while N-methyl-2-pyrrolidone is passed through it, and the pressure (MPa) at which the composite hollow fiber membrane ruptures is measured.

This application relates to the field of reverse osmosis membranes, specifically disclosing a highly stable, easily stored, low-pressure reverse osmosis membrane and its preparation method. The highly stable, easily stored, low-pressure reverse osmosis membrane comprises a polysulfone-based membrane and a polyamide functional layer. The polyamide functional layer is formed by an interfacial polycondensation reaction between an aqueous phase containing organic amines and an oil phase containing acyl chlorides. The aqueous phase also includes silane-modified aminopolyethylene glycol dopamine and an antioxidant. The reverse osmosis membrane of this application utilizes chemical crosslinking modification and the addition of antioxidants to avoid poor stability of the low-pressure reverse osmosis membrane during storage and performance degradation after the membrane is placed.

The invention relates to a kettle type polycarbonate preparation method. According to the preparation method, by mixing cooled circular reaction liquid into raw materials and performing large-flow circulation on the reaction liquid, the temperature stability of a reaction kettle is ensured, the pH value of the reaction liquid is constant, the reaction time is prolonged, and the molecular weight increase stability is ensured, so that the product dispersity is relatively stable; reaction liquid can be fully emulsified by using a high-speed mixer, so that the reaction rate of polycondensation reaction is more balanced, short flow of materials is prevented by connecting multiple stages of polycondensation reaction kettles in series, and the temperature and the total retention time of each reaction kettle are controlled, so that stable product quality is ensured; by supplementing the bisphenol A sodium salt solution into the high-emulsification reaction solution, the interfacial polycondensation reaction is promoted, the content of acyl chloride in the polycarbonate product is reduced, and the end capping rate of the product is improved, so that the product quality is improved.