TIANJIN POLYTECHNIC UNIVERSITY Patent applications |
Patent application number | Title | Published |
20160075845 | Membrane formulation of fluorinated copolymer porous membrance and preparing method thereof - A membrane formulation of fluorinated copolymer porous membrane includes: 15-50 wt % ethylene-chlorotrifluoroethylene copolymer, 30-85 wt % diluent and 0-20 wt % composite pore-forming agent, totally 100 wt %; wherein the diluent is selected from a group consisting of di-isooctyladinpate, di-isooctyladinpate with dibutyl phthalate, diethyl phthalate and dioctyl phthalate with any proportion. Methods for preparing a fluorinated copolymer porous flat membrane and a fluorinated copolymer hollow fiber porous membrane with the above formulation are also provided. With the formulation, a membrane-forming temperature is reduced to below 200° C., and processes thereof are convenient. Furthermore, membrane mechanical property is excellent, porosity is high, permeability is sufficient, and the method is suitable for membrane separation under severe conditions such as acid-base mediums and organic solvents. | 03-17-2016 |
20160001234 | Method for preparing aromatic polyamide porous hollow fiber membrane - A method for preparing an aromatic polyamide porous hollow fiber membrane firstly premixes PPTA resin, solvent, composite pore-forming agents and inorganic particles in a stirring vessel to form casting solution, secondly injects the casting solution into a double-screw extruder to be fully dissolved under the effect of shear force and enters a spinneret via a metering pump. The PPTA hollow fiber membranes are prepared by the dry-wet spinning method, which solves the problems that hard pore-forming and low porosity in the preparation process of PPTA porous membrane. Utilization of the double-screw extruder is capable of greatly shortening the dissolved time and the deaeration time. Meanwhile the increase of PPTA in casting solution also improves mechanical properties of the PPTA membrane. The addition of the inorganic particles improves mechanical toughness and enhance pure water flux, hydrophilia and rejection rate. | 01-07-2016 |
20160001233 | Method for preparing homogeneous braid-reinforced PPTA hollow fiber membrane - A method for preparing a homogeneous braid-reinforced (HMR) PPTA hollow fiber membrane combines PPTA hollow tubular braids with PPTA surface separation layer. The method includes following steps of: (1) preparing the PPTA hollow tubular braids, wherein the PPTA hollow tubular braids which are made from PPTA filament yarns are woven by a two-dimensional braided method, the outer diameter of the PPTA tubular braids is 1-2 mm; (2) preparing the PPTA casting solution as the surface separation layer, wherein the 1-3 wt % PPTA resin, 0-2 wt % inorganic particles and 10-20 wt % pore-forming agents are mixed into 75-89% inorganic acid solvent, stirred for 1-3 hours at 70° C.-90° C. to form homogeneous and transparent casting solution; and (3) preparing reinforced PPTA hollow fiber membrane, wherein the casting solution as the surface separation layer is evenly coated on the surfaces of the PPTA hollow tubular braids through spinneret, and they are immersed in a coagulation bath for solidified formation. | 01-07-2016 |
20150127303 | robust design method for a textile-manufacturing-dedicated, high-efficient, energy-saving, multiphase asynchronous motor - A robust design method for a textile-manufacturing-dedicated, high-efficient, energy-saving, multiphase asynchronous motor, includes the following steps: designating a motor; designating design method; designating design variables of the high-efficient, energy-saving, multiphase asynchronous motor; building mathematical models of each index respectively to constitute a robust design model with multiple indexes; building the controllable factor level table; selecting appropriate orthogonal table according to the number of the optimizing variables and the level number of each variable; building an inner orthogonal table for inner design; building an outer orthogonal table for outer design; computing the values of the output characteristics and signal to noise ratio of the experimental schemes determined by the inner and outer orthogonal tables; determining the optimal combination of parameters; going through tolerance design; drawing the parts of the textile-manufacturing-dedicated, high-efficient, energy-saving, multiphase asynchronous motor according to the optimal design scheme, wire-cutting the mold, dieing, laminating, coiling, inserting windings, dipping paint and assembling. Combining the actual operating characteristics of textile-manufacturing-dedicated motor, a high-efficient, energy-saving, multiphase asynchronous motor with stable performance, reliable operation and low cost is achieved. The motor achieves the optimal balance between the quality and cost, and enhances the market competitiveness. | 05-07-2015 |
20140311968 | Preparation method of perfluorinated polymer hollow fiber membrane - A preparation method of a perfluorinated polymer hollow fiber membrane comprises: evenly mixing a first mixture that is mixed by a perfluorinated polymer, PS, a polymer additive, and a composite pore-forming agent; evenly mixing a second mixture that is mixed by the first mixture and an organic liquid; under 300° C.-350° C., processing the second mixture with a melt to spin by a twin-screw extruder; extruding a hollow fiber by a hollow fiber spinneret; dipping the hollow fiber membrane into deionized water for 48 hours; putting the hollow fiber membrane aired into a concentrated sulfuric acid to process with a sulfonation; washing the hollow fiber membrane by deionized water; and drying the hollow fiber membrane; in such a manner that the hydrophilic perfluorinated polymer hollow fiber membrane is obtained. | 10-23-2014 |
20130244861 | COMPOSITE CATALYTIC MEMBRANE APPLIED TO CATALYTIC ESTERIFICATION AND PREPARATION METHOD THEREOF - A composite catalytic membrane applied to catalytic esterification and preparation method thereof are provided. The composite catalytic membrane is porous, and includes nonwoven fabric as base membrane and catalytic coating which is formed on the surface of nonwoven fabric and in the pores and gaps between the nonwoven fabric fibers. The catalytic coating uses solid acid as catalyst and polymer or modified sulfonated polymer as membrane-forming material. The membrane is formed by coating or immersion method, and the composite catalytic membrane is obtained by cross-linking after forming. The greenization and high efficiency of catalytic esterification and preparation of biodiesel can be achieved owing to the microporous structure and huge specific surface area of the composite catalytic membrane. The composite catalytic membrane has high mechanical strength, good reproducibility and stability and easily enables continuous repetitive production of catalytic esterification. The process is simple and easy to control and scale-up. | 09-19-2013 |
20110147300 | COMPOSITION FOR PREPARATION OF HOLLOW FIBER POROUS MEMBRANE AND PREPARATION METHOD USING THE SAME - A composition for preparation of a hollow fiber porous membrane including 40-60 wt. % a polymer matrix, 20-30 wt. % an organic mixed solution, and 20-40 wt. % a water-soluble substance. The polymer matrix is a polymer capable of dissolving in an organic solvent and melt processing. The organic mixed solution is a mixture comprising 60-90 wt. % a first liquid soluble to the polymer matrix and 10-40 wt. % a second liquid insoluble to the polymer matrix. The water-soluble substance is a water-soluble polymer, a low molecular weight water-soluble particle, or a mixture thereof. A method for producing the hollow fiber porous membrane using the composition including a) preparing the organic mixed solution, b) mixing the components of the composition, c) applying melt spinning, d) drawing, and e) washing. The hollow fiber membrane has high strength, large flux, and low cost. | 06-23-2011 |
20090306259 | METHOD OF PREPARING OIL ABSORBING FIBERS - A method of preparing oil-absorbing fibers by: a) fully dissolving a dispersant and a deionized water in a reaction vessel, adding a methacrylate monomer and an initiator to a reactor and stirring to form a homogenous solution, transferring the homogenous solution into the reaction vessel, charging nitrogen gas, stirring, raising temperature to 70-80° C., allowing to react for 2-6 hours, raising temperature to 90-100° C., allowing to react for 2-4 hours, collecting a resultant product, washing, drying, and obtaining a white resin; b) drying the white resin, mixing with a swelling agent, and sealing the mixture at room temperature for 48-96 hours to yield a homogenous gel; c) grinding the gel completely, spinning by a plunger spinner, and coagulating with a coagulation bath to yield an as-spun oil-absorbing fiber; and d) drawing the as-spun oil-absorbing fiber with a draw ratio of 2-6 to yield oil-absorbing fibers. | 12-10-2009 |