37results about How to "The film making process is simple" patented technology

The invention provides a polyether sulfone porous membrane for a membrane distillation process and a preparation method of the polyether sulfone porous membrane, wherein before the polyether sulfone porous membrane for the membrane distillation process is prepared, no hydrophobic modification treatment on polyether sulfone body material is carried out, and no hydrophobic modification treatment on the membrane is carried out after membrane is prepared. The preparation method comprises the following steps: firstly preparing a wet polyether sulfone porous membrane by a lyotropic phase transformation method, and then drying the wet membrane so as to prepare the polyether sulfone porous membrane for the membrane distillation process. The polyether sulfone porous membrane provided by the invention has the advantages that membrane distillation flux is stable and high, the preparation method is mature and simple, the cost is low, the amplification is easy, and the application prospects in the fields such as desalination of seawater and bitter saline water, concentration of biological macromolecular solution and concentration of sugar-containing liquid are broad.

A process for preparing the electroactive ion-exchanging nickel ferricyanide membrane used to treat the industrial sewage containing alkali metal ions includes generating a capillary gap between electrically conductive substrate and film, filling the solution prepared from potassium ferriccyanide, 2-valence Ni salt, Na salt and water into said gap, laying aside for chemical depositing and removing film.

The present invention provides a preparing method of accelerating transmitting film containing poly allyl amine for separating acidic gas. The invention includes following steps: pretreatment using polysulphone or polyether sulfone plate film as base film; preparing casting film solution by mixing poly allyl amine solution with polyvinyl alcohol solution, plasmosan solution and polyacrylamide solution respectively, casting film solution coating on the base film; accelerating transmitting film containing poly allyl amine for separating acidic gas being obtained by dyring. The method has a simple process, the accelerating transmitting film has a better filming performance and pressure resistance, the mainly parameter is CO2/CH4, CO2/N2 separating factor 40-150, CO2 permeation rate (10-150) *10-6cm3(STP)cm-2s-1cmHg-1; H2S/CH4 separating factor 60-500, H2S permeation rate (50-900) *10-6cm3(STP)cm-2s-1cmHg-1.

The invention discloses a preparation method of a nanofiltration composite membrane capable of being used for softening water. A trimesic acid crosslinking agent and polyethyleneimine are crosslinkedon the surface of an ultrafiltration membrane to obtain a composite layer, and the charge effect of the membrane surface is enhanced by quaternization, thereby enhancing the selectivity. The advantages of good hydrophilicity, strong charge property, stable film-forming property and the like of polyethyleneimine are fully exerted, and the desalination rate and the water flux are greatly improved. The membrane preparation process is simple, process parameters are easy to optimize, raw materials are cheap and easy to obtain, and expanded production of the nanofiltration composite membrane is facilitated; after amino quaternization, the charge effect is enhanced, and the membrane selectivity is further improved.

The invention discloses an anion exchange membrane and a preparation method thereof, and belongs to the technical field of membranes, and the anion exchange membrane is prepared by the following steps: naturally dissolving a polymer reinforcing agent chloromethylated polyethersulfone, an initiator azodiethylbutyronitrile and a functional agent imidazole in a mixed solution containing two monomers of chloromethyl styrene and divinyl benzene; and coating a reinforced fabric with a formed uniform membrane casting solution, and carrying out heating polymerization to obtain the anion exchange membrane. According to the invention, a classical polymerization system of vinylbenzyl chloride and divinyl benzene is improved, a green preparation route of the anion exchange membrane without using an organic solvent is developed, and the prepared anion exchange membrane shows excellent performance when being applied to diffusion dialysis acid recovery; the requirements of industrial waste acid recovery and application are completely met.

The invention discloses an electrochemical energy device and a manufacturing method thereof. The electrochemical energy device uses an alkaline anion exchange composite film as a solid electrolyte anda support layer, and the alkaline anion exchange composite film is a quaternized chitosan-polyvinyl alcohol film. The quaternized chitosan-polyvinyl alcohol film is a good all-solid-state electrolyte. A low-cost non-toxic material with high ionic conductivity at an ambient temperature is achieved and good mechanical strength and excellent electrochemical performance are possessed. The quaternizedchitosan-polyvinyl alcohol film is applied to the electrochemical energy device, a problem that a traditional electrolyte is easy to leak is solved, packaging difficulty is reduced, cost is saved toa certain extent, and the device and the method are suitable for industrial production.

The invention discloses a method using ester solvent to perform dissolving to prepare a food-grade polylactic acid film. The method is characterized in that a food-grade ethyl formate, methyl acetateor ethyl acetate solvent is used to dissolve polylactic acid particles to obtain a solution, and the solution is poured onto a glass plate or a stainless steel plate to form the film. The method has the advantages that the method is simple in film preparation process, the prepared food-grade polylactic acid film is good in toughness and degradability, good in gas permeability and capable of beingused as a fresh-keeping packaging material used for prolonging the storage life of food such as chilled meat and fruits and vegetables, and the toughness of the food-grade polylactic acid film is better than existing plastic wrap.

The invention relates to a method for preparing a reverse osmosis composite membrane with high salt rejection rate and high flux by reforming a polyamide separation layer. The method is characterized in that after interfacial polymerization membrane preparation, the membrane is soaked in a modified solution containing a nucleophilic catalyst to prepare the reverse osmosis composite membrane with high salt rejection rate and high flux. The mass percentage concentration of the nucleophilic catalyst in the modified solution is 0.01%-5%. The modified nucleophilic catalyst is prepared from 4-dimethylaminopyridine, 4-pyrrolidinyl pyridine and N-methylimidazole. The solvent comprises water, normal hexane and normal heptane. After modification, a sodium chloride solution with the concentration of 2000 mg/L is adopted for testing the salt rejection rate and the water flux of the membrane, and under the operation pressure of 15.5 bar, the water flux of the membrane is 38.46-84.90 L.m<-2>. h<-1>, and the salt rejection rate is 98.00-99.54%. The whole membrane preparation process is simple and easy to amplify.

The invention relates to a method for decolorizing a sugar solution. The method comprises the following steps: dissolving a large amount of celluloses into an aqueous solution of urea and sodium hydroxide in a slow cooling manner, precipitating the celluloses in order to prepare a cellulose membrane, and using the membrane as a filtering medium to separate pigments in the sugar solution in order to obtain a decolorized sugar solution. Raw materials used in the method are all cheap and nontoxic; and the method significantly reduces the use amounts of sodium hydroxide, urea and water required for dissolving celluloses, allows the concentration of the cellulose solution to be far higher than that in the prior art, allows the decolorizing rate of raw sugar to reach 90% or above, and has the advantages of simplicity, fastness, low carbon emission and no "three wastes" in the whole decolorizing process.

The invention discloses a preparation method of a homogeneous cation exchange membrane containing alkylbenzene sulfonate, and the preparation method comprises the following steps: preparing a membrane casting solution, evaporating a solvent to prepare a membrane, and post-treating, the invention also provides the homogeneous cation exchange membrane prepared by the preparation method, and the invention also provides an application of the homogeneous cation exchange membrane prepared by the preparation method. The invention relates to the field of electrodialysis concentration, belongs to the field of exchange membranes, and particularly provides a preparation method and application of a homogeneous cation exchange membrane containing alkylbenzene sulfonate, the homogeneous cation exchange membrane which is low in cost and environmentally friendly is prepared, and the problem that the ED process applied to brackish water desalination is high in cost is solved. The prepared membrane is low in resistance, good in desalting performance and capable of being stably used for a long time.