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

The invention relates to a method for producing a quaternary ammonium chitosan / polyving akohol membrane, comprising the following steps: (1) synthesizing the quaternary ammonium chitosan; (2) washing and drying the quaternary ammonium chitosan; (3) synthesizing the quaternary ammonium chitosan / polyving akohol membrane; and (4) scraping the quaternary ammonium chitosan / polyving akohol membrane on a flat plate and forming the quaternary ammonium chitosan / polyving akohol membrane. Compared with the prior art, the method for producing the quaternary ammonium chitosan / polyving akohol membrane adopts the raw materials of rich source and low cost, is easy and is convenient to operate.

The invention provides a preparation method of a chitosan-protocatechuic acid graft copolymer film. The preparation method comprises the following steps: using chitosan and protocatechuic acid molecules as reaction substrates, using EDC / NHS as a crosslinking agent, synthesizing a chitosan-protocatechuic acid graft copolymer, and performing freeze drying to prepare a film forming solution with the proper concentration; removing bubbles, drying, soaking till the film forming solution is neutral, and performing film uncovering to finally obtain the chitosan-protocatechuic acid graft copolymer film. The preparation method is low in investment, and is suitable for use in large-scale production. The chitosan-protocatechuic acid graft copolymer film prepared by the preparation method is significantly improved in mechanical properties and physical and chemical properties, is low in water content, good in water resistance, low in transparency and high in tensile strength, has relatively high antioxidant activity, provides a very good way for artificially synthesizing a novel food fresh-keeping film, widens the application range of a chitosan film in food storage and food fresh keeping, improves the value of chitosan, and improves economic benefits of a food processing enterprise.

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 high-permeability selective acid-resistant nanofiltration membrane material as well as a preparation method and application thereof. The nanofiltration membrane material comprises a dense separation layer which is formed by assembling an amine and a quaternary ammonium salt polycation electrolyte and a polyanion electrolyte material with sulfonic acid groups or sulfuric acid groups layer by layer; the concentration of the polycation is 0.1-20 g / L, and the polycation is dissolved in a salt solution of 0.05-5 mol / L; the used polyanion electrolyte polymer material is a polymer material with sulfonic acid groups or sulfuric acid groups, the concentration of polyanion is 0.1-20g / L, and the polyanion is dissolved in a 0.05-5mol / L salt solution; the dense separation layer of the nanofiltration membrane is formed by layer-by-layer assembly, and has better permeation selectivity and excellent acid-resistant stability than a commercial nanofiltration membrane. The retention rate of the membrane to multivalent cations is greater than 90%, the permeability of the membrane to phosphoric acid is greater than 80%, and the permeability of phosphoric acid is one order of magnitude layer than that of that of a commercial membrane. The high-permeability selective acid-resistant nanofiltration membrane material is used in phosphoric acid refining and recycling processes, inorganic compounds in phosphoric acid-containing feed liquid are removed through pretreatment, then substances such as large particles and colloids are removed through ultrafiltration, stable operation of a nanofiltration membrane process is achieved, high-purity phosphoric acid of different grades is obtained, and the high-permeability selective acid-resistant nanofiltration membrane material has wide application in the aspects of phosphoric acid refining and phosphoric acid recycling.

The invention discloses a polysaccharide / protein composite film with high barrier property and a preparation method thereof. The preparation method comprises the following steps: preparing one or moreof polycarbonate, polycaprolactone or polylactic acid into a solution, and casting to form a film to obtain a composite film bottom layer; carrying out tape casting on the composite film bottom layerby mixing konjac glucomannan with other polysaccharides or proteins to form a composite film interlayer; and finally, preparing one or more of polylactic acid, polycarbonate or polycaprolactone intoa solution, and casting the solution on the composite film interlayer to form a composite film top layer so as to obtain the biodegradable polysaccharide / protein composite film with high barrier property. The polysaccharide / protein composite film with high barrier property is prepared by using a multilayer tape casting method, the film preparation process is simple, the efficiency is high and thebarrier effect of the composite film is remarkably improved.

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 relates to a polydimethylsiloxane permeable vaporized gasoline desulphurization membrane and a preparation method thereof. The invention relates to a polydimethylsiloxane composite membrane used in membrane-separation desulphurization, and a preparation method thereof. According to the invention, with the membrane, a separation performance can be improved. Relatively high flux and selectivity of the membrane are maintained. Also, the cost of the polydimethylsiloxane permeable vaporized gasoline desulphurization membrane is low. The polydimethylsiloxane permeable vaporized gasoline desulphurization membrane is a composite membrane composed of an active layer and a basement membrane. The preparation method comprises steps that: a metal oxide is dried, and is preserved for later use; the basement membrane is sufficiently washed by using an organic solvent, and is preserved for later use; PDMS is added to a solvent A and a cross-linking agent, such that a solution A is prepared; the processed metal oxide is added to the solution A, and the solution is subject to an ultrasonic treatment, such that a solution B is obtained; a catalyst is added to the solution B, such that a solution C is obtained; the solution C is coated on the basement membrane, and is dried, such that the polydimethylsiloxane permeable vaporized gasoline desulphurization membrane is obtained.

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 discloses a conductive polyethylene terephthalate (PET) touch screen film and a preparation method thereof. The conductive PET touch screen film comprises a protective layer, a silver conductive layer, an adhesive layer and a PET base layer from outside to inside, wherein the silver conductive layer consists of 0.2-1.5% of silver nanowires, 0.005-0.05% of a fluorocarbon surfactant, 0.1-2% of a dispersant, 1-3% of ethylene glycol dibutyl ether, 2-5% of ethylene glycol, 1-2% of 2-hexyl ethanol and the balance of an organic alcohol solvent. The film has superior performance, easilyavailable materials and good electrical conductivity.

The invention provides a low-temperature water-soluble sealing film, and belongs to the technical field of decontamination of radioactive polluted metal surfaces. The sealing film comprises the following components in parts by mass: 91.0-102.5 parts of a base material, 1.5-2.0 parts of a plasticizer and 0.5-1.0 part of a surfactant, wherein the base material is a mixture of polyvinyl alcohol (PVA), acrylamide and sodium hydroxide; the plasticizer is glycerol; the surfactant is sodium dodecyl sulfate. The invention also provides a preparation method and application of the low-temperature water-soluble sealing film. The water-soluble sealing film provided by the invention can be quickly dissolved even in cold water at the temperature of between 5 and 10 DEG C, the film making process is simple, the operation is simple and convenient, the waste generation amount is small, the water-soluble sealing film is an extremely simple and easy sealing film capable of preventing radioactive pollution on the metal surface, the random diffusion of radioactive aerosols attached to the metal surface can be effectively avoided, and a new technical means is provided for the decontamination treatment of the radioactive pollution on the metal surface in the nuclear facility decommissioning engineering.

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.