91 results about "Interfacial polycondensation" patented technology

The invention discloses a polyamide nano filter membrane containing zwitterions and a preparation method thereof. The polyamide nano filter membrane containing the zwitterions comprises a porous polysulfone supporting player and a polyamide functional layer containing the zwitterions, and is prepared by carrying out interfacial polycondensation to the mixed water solution of polyamine and a zwitterionic monomer and the organic solution of multielement acyl chloride. Under the operation pressure of 0.6MPa, the nano filter membrane prepared by the method has high water flux (35-50L.m<-2>.h<-1>), and simultaneously, has very high trapping rate of 90-98% to divalent salt ions, and has lower trapping rate of less than 40% to univalent salt ions, in addition, the nano filter membrane has good stain resistance under the long-term operation. Thus, the prepared polyamide nano filter membrane containing the zwitterions has high permeability and stain resistance, the preparation method is simpleand easy to implement, the cost is low, and the industrial application prospect is good.

In manufacturing a composite semipermeable membrane useful for separating a liquid mixture selectively, it is rendered possible to provide a composite semipermeable membrane that exhibits reduced deterioration of water permeability and solute removing property as a result of drying and that demonstrates reduced economic burden and load for waste liquid treatment without impairing the water permeability or solute removal ratio of the composite semipermeable membrane through change of the membrane manufacturing method, by making a saccharide exist in an aqueous polyfunctional amine solution in performing interfacial polycondensation by bringing the aqueous solution of the polyfunctional amine into contact with an organic solvent solution containing a polyfunctional acid halide on a microporous support membrane.

The invention relates to a polymeric composite membrane structure, in particular to a polymeric composite reverse osmosis membrane with an antibacterial function. The antibacterial composite reverse osmosis membrane is characterized in that: a polyamide polymeric desalination layer is compounded on a porous supporting membrane through interfacial polycondensation of polyamine and polyacyl chloride; and a polymeric material with the antibacterial function is compounded on the polymeric desalination layer by a surface coating technology. Sericin with the antibacterial function is coated on the surface of the conventional composite reverse osmosis membrane, so that hydrophilcity and antibacterial activity of the composite reverse osmosis membrane can be greatly improved and high biological pollution resistance is achieved. The antibacterial composite reverse osmosis membrane has the characteristics of simplicity in preparation, high desalination rate and high water flux. The reverse osmosis membrane has wide application.

The invention relates to a polymer separation membrane, in particular to a polyamide composite nanofiltration membrane and a preparation method thereof. A polyamide ultra-thin functional layer is compounded on a porous support membrane through interfacial polycondensation between aliphatic macromolecular polyamine and poly(acyl chloride). The preparation method comprises the following steps: directly immersing the porous support membrane into aliphatic macromolecular polyamine water solution, using a rubber roller to roll the surface of the support membrane, taking out, draining the water solution, blow-drying with nitrogen, performing single-side interfacial polymerization reaction with poly(acyl chloride) solution only on the surface of the porous support membrane, shade-drying the composite membrane in the air, and further performing heat treatment and rinsing for getting the composite nanofiltration membrane. The invention provides the novel polyamide composite nanofiltration membrane which is easy to get raw materials, low in price and excellent in selective separation performance and the preparation method thereof. The novel polyamide composite nanofiltration membrane has a wide range of applications, and the manufacturing method is simple.

The invention discloses a method for preparing a pollution-resistant low-pressure reverse osmosis membrane and belongs to the technical field of the separation of reverse osmosis membranes for water treatment. The method comprises the following steps of: preparing a polyamide membrane on a polysulfone porous membrane by using an aqueous solution of polyamine and an organic solution of polyacyl chloride through interfacial polycondensation, and coating and cross-linking a layer of polyvinyl alcohol-grafted zwitterionic copolymer membrane on the surface of the polyamide membrane. The method for preparing the pollution-resistant low-pressure reverse osmosis membrane is reasonably designed; a polyvinyl alcohol-grafted zwitterionic copolymer is coated and cross-linked on the polyamide membrane which is prepared on the polysulfone porous membrane by using the aqueous solution of polyamine and the organic solution of polyacyl chloride through interfacial polycondensation, so that the hydrophilcity of the surface of the membrane is improved, and the adhesiveness of organic matter is reduced; and the reverse osmosis membrane has good pollution resistance during long-time running. The membrane has high backwashing resistance and stability; and the salt rejection rate of the membrane on a NaCl aqueous solution at the concentration of 3.5g.L<-1> can reach over 97.0 percent at the temperature of 25 DEG C and under the pressure of 1.5MPa.

The present invention relates to a new-type aromatic polyamide reverse osmosis composite membrane containing diphenyl structure. It is prepared by utilizing aromatic polybasic acyl chloride containing diphenyl structure and aromatic polyamide to make them implement interfacial polycondencation reaction on the polysulfone supporting layer. It can be extensively used in the fields of sea-water desalination and preparation of ultrapure water.

The present invention provides a composite reverse osmosis membrane as a polyamide membrane including a side chain amino group such as a residue of a polyvinyl alcohol-based amine compound represented by Formula 1. Such a membrane can remove organic impurities under a low pressure, providing an economical method for removal of impurities. An aqueous solution including a polyvinyl alcohol-based amine compound having a side chain amino group represented by Formula 1 is applied on a polysulfone-based ultrafiltration membrane as a microporous support. Next, trimesic acid chloride solution is applied causing interfacial polycondensation, which generates a reverse osmosis membrane. When this composite reverse osmosis membrane is evaluated by using a pH 6.5 aqueous solution including 500 mg/l of sodium chloride at an operation pressure of 5 kg/cm² and at a temperature of 25° C., the permeable flux is at least 1.5 m³/m²·d, and the salt rejection is 80% or less.

wherein 0<a, 0≦b, 2<c, 1≦x≦5, 0≦y≦4; R¹ is at least one group selected from the group consisting of an ether group, an alkylene group and an ester group; and R² is at least one group selected from the group consisting of an alkyl group and a halogen group.

The invention relates to a structure of a high molecular composite membrane, in particular to a self-cleaning high molecular reverse osmosis membrane. The self-cleaning reverse osmosis membrane is characterized in that a porous support membrane is compounded with a polyamide ultrathin desalting layer through interfacial polycondensation of aromatic polyamine and polyatomic acyl chloride, and the compounded desalting layer is compounded with a temperature-sensitive functional high molecular material with low critical transition temperature through solution coating technology. The self-cleaning reverse osmosis membrane has the advantage that the desalting rate and water flux of the reverse osmosis membrane are not lower than those of the prior anti-pollution reverse osmosis membrane technology, and also has the advantages of universality, simplicity, high efficiency and the like; and a preparation method thereof is comparatively simple. The reverse osmosis membrane of the invention has wide application.

The invention relates to a macromolecular composite membrane for water treatment and in particular relates to a composite reverse osmosis membrane with an antibacterial function. The composite reverse osmosis membrane is characterized by compositing a polyamide macromolecular desalination layer on a porous support membrane through interfacial polycondensation between polyamine and poly-acyl chloride and coating an inorganic material layer with an antibacterial function on the macromolecular desalination layer through the technology of compositing by alternate impregnation in solutions. The composite reverse osmosis membrane has the advantages that the hydrophilicity and antibacterial property of the composite reverse osmosis membrane are greatly improved and the composite reverse osmosis membrane has good biological pollution resistance by depositing the inorganic material with the antibacterial function on the surface of the existing polyamide composite reverse osmosis membrane; and the composite reverse osmosis membrane with the antibacterial function also has the characteristics that the composite reverse osmosis membrane is easy to prepare, and the desalination rate and the water flux are not lower than the desalination rates and the water fluxes of the existing composite reverse osmosis membranes. The composite reverse osmosis membrane has a wide range of application.

The invention relates to a polymer separation membrane, in particular to a high-performance polyamide composite membrane. In the invention, an ultra-thin active separating layer is compounded on a porous supporting membrane through interfacial polycondensation between an aqueous solution containing aliphatic macromolecular polyamine and an organic solution containing a dyadic aromatic reaction monomer; the aliphatic macromolecular polyamine is polyvinylamine; the dyadic aromatic reaction monomer is phthaloyl chloride or paraphthaloyl chloride or 2,4-toluene diisocyanate; and the thickness of the active separating layer is 0.02-0.5 mum. The invention has the advantage that a novel high-performance composite nanofiltration membrane which is made of raw materials easy to obtain and has low cost and excellent preferential segregation performance is provided. The high-performance composite nanofiltration membrane provided by the invention has multiple purposes and a simple manufacturing method.

The invention relates to a macromolecular separation membrane, and in particular relates to a high-flux composite nanofiltration membrane. An ultrathin active separation layer is compounded on a porous support membrane through interfacial polycondensation between the aqueous solution containing aliphatic macromolecular polyamine and an organic solution containing aromatic polyacyl chloride; the aliphatic macromolecular polyamine is sericin with concentration of 0.2-6.0wt%; and the aromatic polyacyl chloride is trimesoyl chloride or 5-isocyanate-isophthalyl chloride or 5-oxyformyl chloride-isophthalyl chloride or phthaloyl chloride or paraphthaloyl chloride or 2,4-toluene diisocyanate, with concentration of 0.5-4.0wt%. The invention provides a novel high-flux composite nanofiltration membrane which has the advantages that: the raw materials are easily available, the cost is low, the selective separation performance is good, and the penetration flux is high. The high-flux composite nanofiltration membrane provided by the invention is widely applicable, and the manufacturing method is simple.

The invention discloses a method for modifying the surface of high molecular weight polyethylene powder through interfacial polycondensation. The method comprises the following steps of: soaking ultra-high molecular weight polyethylene (UHMWPE) powder in a reaction monomer solution containing two or more than two acyl chloride groups or isocyanate groups; and adding into a reaction monomer solution containing two or more than two amino groups and hydroxyl groups, stirring and dispersing, and obtaining a layer of polyurea and/or polyurethane and/or polyamide film on the surface of the ultra-high molecular weight polyethylene powder through the interfacial polycondensation, so that the compatibility and adhesion of the surface of the UHMWPE powder are effectively improved and the performance of the UHMWPE powder is not changed. In addition, the method for modifying the surface of the UHMWPE powder is easy to implement, high in treatment speed and good in treatment effect, has low requirement on equipment, and is suitable for industrial production.

The invention relates to a novel poly piperazine amide nanofiltration membrane and a preparation method thereof. The poly piperazine amide nanofiltration membrane provided by the invention consists of a polysulfone supporting layer and a poly piperazine amide functional layer which is prepared by interfacial polycondensation of the aromatic multi acyl chloride with biphenyl structure or compounds thereof and piperazine. The novel poly piperazine amide nanofiltration membrane is prepared by utilizing the interfacial polycondensation of the organic solution of the novel butyryl chloride with biphenyl structure or compounds thereof and the aqueous solution of piperazine on the polysulfone porous supporting layer. The nanofiltration membrane prepared by the method has high water flux (more than 60l/m<2>.h) and high desalinization ratio (above 98%) of dianion and comparatively high desalinization ratio of single valence anion (60%-70%) under the operation pressure of 0.5Mpa.

The invention provides a polyamide nanofiltration membrane with a pattern surface. The polyamide nanofiltration membrane is formed by compounding a supporting base membrane and a polyamide separationlayer with a pattern surface; wherein the polyamide separation layer is subjected to interfacial polycondensation on the surface of the supporting base membrane, and the surface of the polyamide separation layer has patterns; through fine regulation and control of an interfacial polymerization reaction system and process parameters, the microstructure of a primary polymer film and the growth process of a separation layer are regulated to induce a polyamide surface with pattern morphology on the surface of a porous base film, and the nanofiltration membrane is endowed with good separation performance by the patterned surface; the membrane preparation method is simple, is convenient to realize in continuous industrial production, and is expected to have a wide application prospect in the aspects of wastewater salt separation recycling, seawater desalination and drinking water purification.

The invention relates to the field of an organic optical functional material and in particular relates to a second-order nonlinear optical polyarylester material, and a synthetic method and application thereof. According to the invention, a bisacyl chloride compound and a bisphenol compound with a carboxyl functional group are taken as monomers for interfacial polycondensation, so that polyarylester with carboxyl on the side chain thereof can be obtained; furthermore, a chromophore molecule with electro-optical activity is introduced to the side chain of the polymer so that a side-chain type second-order nonlinear optical polyarylester material can be obtained; or, a bisphenol compound, a bishydroxyl chromophore and a bisacyl chloride compound are utilized as monomers for copolymerization, so that a main-chain type second-order nonlinear optical polyarylester material containing a chromophore module on the main chain can be obtained. The two methods both successfully solves the problem that polyarylester is difficult to dissolve and not easy to fabricate into a thin-film device. The two polyarylester materials are prepared into thin films and then polarized by heating in an electric field so that polyarylester thin films with high electro-optical activity can be obtained; and the polyarylester thin films can be used as materials for preparing an electro-optical device.

Amino acid-based poly(ester urea)s (PEU) are emerging as a class of polymers that have shown promise in regenerative medicine applications. Embodiments of the invention relate to the synthesis of PEUs carrying pendent “clickable” groups on modified tyrosine amino acids. The pendent species include alkyne, azide, alkene, tyrosine-phenol, and ketone groups. PEUs with M_w exceeding 100k Da were obtained via interfacial polycondensation methods and the concentration of pendent groups was varied by copolymerization. The incorporation of derivatizable functionalities is demonstrated using ¹H NMR and UV-Vis spectroscopy methods. Electrospinning was used to fabricate PEU nanofibers with a diameters ranging from 350 nm to 500 nm. The nanofiber matricies possess mechanical strengths suitable for tissue engineering (Young's modulus: 300±45 MPa; tensile stress: 8.5±1.2 MPa). A series of bioactive peptides and fluorescent molecules were conjugated to the surface of the nanofibers following electrospinning using bio-orthogonal reactions in aqueous media.

The invention discloses a preparation method of an asymmetric antioxidant polyamide permeable membrane. The method comprises the steps of: adopting p-phenylenediamine (MPD) and trimesoyl chloride (TMC) monomers, combining a polyamide surface layer on the surface of a polysulfone (PES) support membrane through an interfacial polycondensation way, and implementing posttreatment on the surface layer through oxalic acid cooperating with a dehydrating agent, thus preparing an antioxidant polyamide composite permeable membrane. The treatment method, which adopts the oxalic acid cooperating with the dehydrating agent, can effectively improve the oxidative resistance and the hydrophilicity of the polyamide surface layer, and the method, cooperating with an asymmetric membrane structure, can greatly reduce the influence of concentration polarization on membrane separating property, so as to further enhance the water flux of the membrane as well as the reject rate to salt ions. The initiative preparation method, which operates at normal temperature and under normal pressure, is simple in experimental condition and short in preparation cycle, and the method is specifically applicable to mass preparation of high-performance permeable separating membranes.

The invention relates to a macromolecular composite membrane and in particular relates to a surface mineralized composite reverse osmosis membrane with high hydrophilicity. The composite reverse osmosis membrane is used for performing water treatment and is characterized by compositing a polyamide macromolecular desalination layer on a porous support membrane through interfacial polycondensation between polyamine and poly-acyl chloride and compositing a barium sulfate coating on the macromolecular desalination layer through the technology of mineralization by alternate impregnation in solutions. The hydrophilicity of the composite reverse osmosis membrane is greatly improved by depositing high-hydrophilicity inorganic materials on the surface of the existing polyamide composite reverse osmosis membrane. The composite reverse osmosis membrane has the advantages that on the premise that the desalination rate is unchanged or is slightly increased, the water flux of the composite reverse osmosis membrane is higher than that of the traditional composite reverse osmosis membrane formed by a porous support layer and a macromolecular desalination layer; and a preparation method is simpler. The composite reverse osmosis membrane has a wide range of application.

The invention provides aromatic polycarbonate. The main chain of the aromatic polycarbonate comprises non-aromatic structure micromolecule coupling group -O-[R1-O]k- or -N-[R1-N]k-, wherein R1 is ethylidene, propylidene or butylidene, k is 1-8, preferably 2-6. The aromatic polycarbonate can be prepared from bisphenol, coupling agent, end-capping reagent and phosgene through traditional interfacial polycondensation reaction.

A method for producing carbonate is disclosed. The process represents a modification of the known interfacial polycondensation process and involves the introduction of (i) polycarbonate and phosgene An organic phase of a solvent and (ii) an aqueous phase containing an aqueous base, a dihydroxy compound and optionally a monophenol to form an emulsion. Maintaining the specified temperature and process conditions results in polycarbonate with excellent performance and waste water characterized by purity.

The invention discloses a handling method of chrome industrial wastewater belonging to tertiry treatment and multi-purpose use domain, which comprises the following steps: óƒ preparing polyamide microcapsule include soda solution through interfacial polycondensation reaction; setting ploy single succinyl imines as disperser; ó proceeding functionalization pretreating of polyamide microcapsule; using skellysolve C -carbon tetrachloride solution of tributyl phosphate (TBP) to soak microcapsule with finite time; ó� enriching hexavalent chromium of industrial waste water through functionalization microcapsule; making microcapsule possess function of enriching hexavalent chromium. This invention avoids hexavalent chromium ion transfer to trivalent chromium and retrieving use hexavalent chromium.