199results about How to "Improve chlorine resistance" patented technology

The invention discloses a grafted modified aromatic polyamide composite reverse osmosis membrane and a preparation method thereof, belonging to preparation technology of composite reverse osmosis membranes. The structural formula of the membrane is shown as follow. The preparation process comprises the following steps: taking a polysulphone membrane as a support membrane, preparing an aromatic polyamide composite reverse osmosis membrane to be grafted by an interfacial polymerization; enabling a graft modified solution containing 3-hydroxymethyl-5,5-dimethylhydantoin to contact the surface of the membrane to be grafted quickly for reacting, and conducting heat treatment to obtain the modified aromatic polyamide composite reverse osmosis membrane grafted with hydantoin derivatives. The invention has simple process, and the prepared membrane has the characteristics of good chlorine resistance and good microbial contamination resistance.

The invention discloses an aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization and a preparation method thereof, belonging to a preparation technology of composite reverse osmosis membranes. The surface of the aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization is provided with a 3-allyl-5,5-dimethylhydantion polymer. The preparation method comprises the steps of: reacting 5,5-dimethylhydantion with allyl bromide to prepare the 3-allyl-5,5-dimethylhydantion polymer as a monomer; and introducing the 3-allyl-5,5-dimethylhydantion polymer into the surface of the aromaticpolyamide composite reverse osmosis membrane by adopting zaodiisobutyronitrile amidine hydrochloride as an initiating agent through using a graft polymerization method to prepare the aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization. The invention has simple process; and the prepared aromaticpolyamide composite reverse osmosis membrane modified by graft polymerization has properties of resisting chlorine and preventing microbial contamination.

The invention discloses a high-temperature resistance polyamide composite membrane and a preparation method thereof. The high-temperature resistance polyamide composite membrane is composed of a non-woven fabric layer, a porous supporting layer and a polyamide layer, wherein a porous supporting membrane material is prepared by adding one or more of a solubility high-temperature resistance polymer P1 and a commodity polymer P2 for preparation of a porous membrane material to a certain solvent and a pore-foaming agent and at least contains the P1. The polyamide composite membrane prepared by the method has very good high-temperature resistance performance and can be widely applied to water treatment composite membrane treatment devices needing to run at a high temperature in industries such as industrial wastewater treatment, petrochemical wastewater treatment, food, medicines and the like.

The present invention relates to a complete process for preparation of high flux and salt rejection thin film composite (TFC) reverse osmosis (RO) membrane including process for preparation of support membrane for thin film, process for thin film coating of support membrane by in-situ interfacial polymerization between diamines and trimesoyl chloride, machine design, chemistry and details of process (engineering+chemistry+ambient) parameter at 1×100 sqm scale upgradable to a scale even 10-20 times higher. The produced membrane is characterized by 96% salt rejection and 48 LM-2H 1 flux with 2000 ppm sodium chloride solution at 250 psi pressure and 95% salt rejection and 46 LM2H 1 flux with 35000 ppm sodium chloride solution at 900 psi pressure. The present invention also relates to complete machine design for PSF ultrafiltration membrane casting and coating for TFC membrane production at commercial level.

The invention belongs to the technical field of membrane separation, and provides a chlorine-resistant composite nanofiltration membrane and a preparation method thereof. The chlorine-resistant composite nanofiltration membrane has charge performance, and comprises a separation function layer and a support layer, wherein the support player is positioned under the separation function layer. The chlorine-resistant composite nanofiltration membrane prepared by the preparation method provided by the invention can be a flat membrane and can also be a hollow fiber membrane. The chlorine-resistant composite nanofiltration membrane monomer has melamine of a triazine ring structure and is subjected to crosslinking treatment, so that the composite membrane has significantly higher chlorine resistance than a commercial polyamide composite membrane, the limitation that the current commercial nanofiltration membrane cannot be used in the environment including residual chlorine is broken, and thus complexity of pretreatment can be greatly reduced, and the application environment is wide.

The invention provides a method for preparing a structure and performance controllable super nanofiltration membrane. The method comprises the following steps: a pre-treatment step of a base membrane, a preparation step of an aqueous phase solution, a preparation step of an oil phase solution and a treatment step of the base membrane. According to the preparation method provided by the invention, a loose polyamide desalinated layer with adjustable height, electric neutrality on the surface and a high hydrophilic structure is formed by controlling the proportion and concentration of a reaction monomer, the active environment and temperature of the reaction monomer and the molecular weight and alcoholysis degree of a polymer and the like, so that the flux of the membrane is obviously improved. Meanwhile, the charge property of the membrane surface is remarkably reduced, and the high flux anti-pollution super nanofiltration membrane is prepared. The desalinization ratio of the prepared super nanofiltration membrane on NaCl is 10-90% and the effective reject rate for organic molecules with the molar weight ranging from 400 to 5000 is over 90% while high flux is guaranteed.

The invention discloses a preparation method of a modified metal-organic framework and a composite nano-filtration membrane. The preparation method of the modified metal-organic framework includes thesteps: modifying the surface of the metal-organic framework by the aid of plant polyphenol; forming a hollow structure in the metal-organic framework to obtain the modified metal-organic framework. The preparation method of the composite nano-filtration membrane containing the modified metal-organic framework includes the steps: loading the metal-organic framework into an aromatic polymer function surface layer of a porous supporting membrane by an interfacial polymerization method in situ to obtain the composite nano-filtration membrane. The modified metal-organic framework in the compositenano-filtration membrane is effectively loaded on the membrane and interacted with a surface layer polymer through a chemical bond, water flux, hydrophilcity and pollution resistance of the compositemembrane are improved, and structure stability and chlorine resistance of the composite nano-filtration membrane can be improved. The preparation method is simple and low in production cost and has good industrial production bases and wide application prospects, and the comprehensive performance of the membrane is remarkably improved.

The invention discloses a pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane and a preparation method thereof. The preparation method comprises the following steps of 1, immersing a polyamide layer of a pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane raw material in an isopropanol aqueous solution, taking out it, and washing it by pure water, and 2, immersing the treated polyamide layer in a mixed solution, taking out it, putting it into an oven for a certain time, and washing the dried polyamide layer by pure water to obtain the pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane, wherein the mixed solution is a water solution containing a compound shown in the formula (I) and glutaraldehyde; and in the formula (I) , R1 represents H or -CH3, R2 represents H or -CH3, R3 represents Cl, Br or I, R4 represents -CH3 or -C6H5, X is in a range of 1-100000, Y is in a range of 1-100000 and Z is in a range of 1-100000. The pollution-resistant chlorine polyamide-resistant reverse osmosis composite membrane has high pollution resistance and chlorine resistance. The preparation method has the simple processes.

The invention discloses a double-perovskite composite metal oxide catalyst and a preparation method and application thereof and belongs to the technical field of atmospheric pollution treatment. The condensed structural formula of the double-perovskite composite metal oxide catalyst is A2B2O6, wherein A is La, Sr or Ce, and B is Mn, Fe, Co, Cu or Ni. The double-perovskite composite metal oxide catalyst has the advantages that the catalyst is excellent in high temperature resistance, water resistance and chlorine resistance and applicable to effective degradation of CVOCs under an industrial high-temperature environment; the catalyst can achieve complete oxidization of industrial typical CVOCs (1,2-dichloroethane) under reaction temperature of 500-550 DEG C, reaction air speed of 20000-30000h<-1> and oxygen concentration of 10-20%; meanwhile, by regulating the loading capacity of transition metal oxide, the oxidizing efficiency of the catalyst can be increased effectively, and the selectivity of the reaction product CO2 can be increased greatly. The preparation method of the catalyst is simple, cheap in raw material and promising in industrial application prospect.

The invention relates to a method for manufacturing an anti-chloride polyamide reverse osmosis composite membrane with high flux, comprising the following steps of: adding one or two of a compound containing epoxy group and a compound containing isocyanide acid group in a basement membrane casting liquid; manufacturing a support basement membrane with a universal phase inversion method; and then compounding a layer of polyamide reverse osmosis composite membrane on the surface of the obtained support basement membrane with an interface polymerization method. The anti-chloride performance and water flux of the obtained composite membrane are increased. In order to further increase the water flux of the polyamide reverse osmosis composite membrane, nano-particles are further added in the basement membrane casting liquid, and the nano-particles are dispersed in the basement membrane casting liquid. The nano-particles can greatly enhance the roughness of the basement membrane surface and increase the valid surface area of the membrane, thereby being capable of increasing the water flux of the composite membrane.

A filtration membrane coating comprising a hydrophilic polymer, a surfactant, and one or more charged compounds, each containing one or more sulfonate functionalities and one or more linkable functionalities selected from the group consisting of amine, monochlorotriazine, and dichlorotriazine. The hydrophilic polymer and surfactant form a thin primer layer which is also superhydrophilic. The primer layer improves flux, and enables improved adhesion of the one or more charged compounds, which form a charged dye layer on top of the primer layer when enhances rejection of charged divalent ions. The coating can be applied while the membrane is packaged in its final form, such as in a spiral wound or other configuration.

The invention discloses a surface grafting modified aromatic polyamide composite reverse osmosis membrane and a preparation method thereof. The surface grafting modified aromatic polyamide composite reverse osmosis membrane is formed by the connection of carboxyl groups on the surface of the aromatic polyamide composite reverse osmosis membrane and one primary amine of ethidene diamine and the connection of another primary amine of the ethidene diamine and hydroxymethyl groups of imidazolidinyl urea. The preparation method of the surface grafting modified aromatic polyamide composite reverse osmosis membrane comprises the following steps of: activating the carboxyl groups on the surface of the membrane by 1-(3-dimethylamino propyl group)-3-ethyl carbodiimide hydrochloride and N-hydroxyl succinimide, so that the carboxyl groups react with the primary amine of the ethidene diamine, and the ethidene diamine is grafted to the surface of the membrane; and activating imidazolidinyl urea molecules according to the same process, so that the imidazolidinyl urea molecules react with the another primary amine of the ethidene diamine molecule grafted to the surface of the membrane, thus obtaining the surface grafting modified aromatic polyamide composite reverse osmosis membrane. The preparation method has the advantages of mild reaction conditions and simple process; and the prepared surface grafting modified aromatic polyamide composite reverse osmosis membrane has high properties of biological pollution resistance and chlorine-resistance.

The invention provides a graphene oxide coating modified aromatic polyamide reverse osmosis membrane and a preparation method thereof and belongs to the technical field of water treatment membrane preparation .The reverse osmosis membrane comprises a substrate supporting layer, a middle porous bearing layer, an ultra-thin compact separation layer and a graphene oxide coating .The thickness of the graphene oxide coating is 50-150 nm .The surface of the compact separation layer is coated with the graphene oxide, so that the salt removing rate, antifouling property and chlorine resistance of the composite reverse osmosis membrane can be effectively improved, and meanwhile needed working pressure is lowered.

The invention discloses a chlorine-resistant reverse osmosis composite membrane and a preparation method thereof. The method is characterized in that an aromatic polyamide separation layer is formed on the surface of a polysulfone microporous membrane by reacting m-phenylenediamine and trimesoyl chloride, an aldehyde compound is used to activate the aromatic polyamide separation layer, the activechlorine attack site is reduced, and a reactive group hydroxyl group is introduced, which provides a basis for fixing the chlorine-resistant protective layer in the form of chemical bonds in a later stage; a hydroxyl group-containing chlorine-resistant polymer material is fixed to the surface of the aromatic polyamide separation layer by a cross-linking agent by means of solvent evaporation and chemical crosslinking to form the chlorine-resistant protective layer, and finally the chlorine-resistant reverse osmosis composite membrane is obtained. The process is simple, and the operationality isstrong.

The invention relates to a method for regenerating dry-spinning waste polyurethane filament into polyurethane spinning stock solution with chlorine resistance, comprising the following technical process: at the temperature of 30 DEG C below zero to 40 DEG C below zero, smashing waste polyurethane filament into short fibre; washing by water and detergent and drying; adding organic solvent accounting for 50-200 wt% of waste polyurethane filament; then adding waste polyurethane filament; finally, adding organic solvent accounting for 46.4-284 wt% of waste polyurethane filament; under the protection of N2, stirring and reacting for 2-4 hours at the reaction temperature of 50-100 DEG C; spraying reaction control agent blended by organic solvent; adding reaction auxiliary agent blended by the organic solvent; stirring for 20-120 minutes; and after curing, obtaining spinning stock solution with proper viscosity. The polyurethane spinning stock solution produced by the method of the invention has good stability, evenness and spinnability and has obvious effect of good chlorine resistance of the product.

The invention discloses a chlorine-resistant polyamide composite reverse osmosis membrane and a preparation method thereof. The chlorine-resistant polyamide composite reverse osmosis membrane is prepared by immersing a polyamide reverse osmosis membrane in an active acyl chloride reactant solution with the concentration of 1 wt%-4 wt%, oscillating for reaction, carrying out secondary interfacial polymerization and forming a polyamide separation layer structure completely terminated by carboxyl groups. The chlorine-resistant polyamide composite reverse osmosis membrane overcomes the shortcomingof poor chlorine resistance of a conventional commercial reverse osmosis membrane, and the obtained composite reverse osmosis membrane has good salt rejection and chlorine resistance, can still maintain the rejection rate of more than 90% of NaCl under the chlorination condition of 30,000 ppm.h, can work for a long time under the condition of residual chlorine, and has wide application prospects.

The invention relates to an antibacterial and non-ironing processing method of jean shirts. The antibacterial and non-ironing processing method comprises the steps: performing biological enzyme desizing, performing enzyme washing, cleaning, spraying or soaking a finishing liquid, dehydrating, pre-drying, pressing and molding, roasting, cooling and dampening as well as cleaning and drying to treat the jean shirt fabric. Compared with the prior art, the antibacterial and non-ironing processing method has the advantages of antibacterial and non-ironing effects, easy sorting, comfortable wearing and the like.

The invention discloses a positively charged composite nano filtration membrane. The nano filtration membrane is characterized in that a modified meta-aramid hollow fiber membrane is taken as a base membrane, an ultra-thin polyamide layer is formed by positively charged polyelectrolyte, polyamine and polyacyl chloride through interfacial polymerization, and a method for preparing the composite nano filtration membrane is prepared. According to the composite nano filtration membrane, pure water throughput under 0.3 MPa is greater than or equal to 24 L (m2 h), the desalting rate of 2g/L divalentcation salt solution is greater than or equal to 90%, the needed cost is lower, and industrialization is easy. The preparation method is simple, operation is easy, reaction conditions are mild, the performance is stable, and the market application prospects are wider.

Fluorescent colorant compositions contain a pigment and a resin. The pigment is a crystalline, azo-based, fluorescent pigment obtained from a coupling reaction of a specific diazo compound, which was obtained from a particular aromatic amine, with a particular acetoacetylamino-containing aromatic coupler. As crystalline characteristics of the crystalline, azo-based, fluorescent pigment, the ratio (h/w) of a height (h) of a maximum peak to its half-value width (w) in a diffraction angle (20) range of from 5 to 35° in an x-ray diffraction spectrum of the pigment may preferably be 20 or greater. Also disclosed are coloring processes and colored articles, which make use of the fluorescent colorant compositions.

The invention discloses a composite nano-filtration membrane, wherein a modified meta-aramid hollow fiber membrane is used as a base membrane, and polyamine, a diaminobenzene fluoride and polyacyl chloride are subjected to an interface polymerization reaction on the base membrane to form an ultra-thin polyamide layer. The invention further provides a preparation method of the composite nano-filtration membrane. With the technical scheme of the present invention, the pure water flux of the prepared composite nano-filtration membrane is more than or equal to 50 L/(m<2>.h) at 0.5 MPa, the desalination rate of the prepared composite nano-filtration membrane to the 2 g/L divalent cation salt solution is more than or equal to 80%, the required cost is low, and the method is suitable for industrial production; and the preparation method has characteristics of simpleness, mild reaction condition, stable product performance and wide market application prospect.