161 results about "Cooling bath" patented technology

The invention discloses a method for preparing a long fiber reinforced hollow fibrous membrane. The method can be implemented in two ways: (1) adopting a spinning nozzle having a long fiber channel; introducing a long fiber into the long fiber channel; guiding the long fiber into a membrane casting solution and fiber compounding area via a fiber positioning plate; co-extruding the compounded long fiber and membrane casting solution; and forming a membrane under the action of core solution and external coagulating bath or cooling bath, and (2) adopting a spinning nozzle for co-extruding the long fiber and the membrane casting solution; guiding the long fiber out of a liquid material jar; guiding the long fiber to pass by a membrane casting solution pipeline and introducing the long fiber into the spinning nozzle from a membrane casting solution inlet of the spinning nozzle; co-extruding the long fiber and membrane casting solution after positioning the long fiber through the fiber positioning plate; forming the membrane under the action of core solution and external coagulating bath; and finally winding the membrane through a guide wheel and a winding machine. The long fiber reinforced compound membrane prepared by using the method has the advantages that the mechanical strength of the hollow fibrous membrane is increased by 3-5 times according to the quantity and variety of the long fiber in the hollow fibrous membrane, and the water flux, the rejection coefficient and the hydrophilicity are all obviously improved.

A cooling system has a cooling bath. The open space of the cooling bath contains a second coolant having a boiling point, and having an electronic device that has a processor that is a heat generating component mounted on a board, and is immersed in the second coolant. A boiling cooling device is thermally connected to the processor, and encloses a first coolant having a boiling point. A first heat exchanger has a high-temperature side passage formed of a group of narrow gaps or a group of micro passages, through which the second coolant is passed, and a low-temperature side passage formed of a group of narrow gaps or a group of micro passages, through which a third cooling medium having a boiling point is passed. A pump is configured to pressurize and deliver the second coolant warmed in the cooling bath toward the inlet of the high-temperature side passage.

Problems: To provide a polyvinylidene fluoride microporous membrane which has high water permeability and separation performance and is excellent in mechanical and chemical strength; and a process for producing the film.

Means for Solving Problems: An anisotropic polyvinylidene fluoride hollow fiber microporous membrane characterized in that the porosity of the cross-sectional bulk layer is higher than the membrane surface porosity of the outer layer and that in the cross section of the membrane, the dense microstructure of the outer surface changes substantially discontinuously into the coarse structure of the bulk layer. The microporous membrane can be produced by introducing by a dry-wet method a dope prepared by dissolving a polyvinylidene fluoride resin together with a water-soluble latent solvent at high temperature into a cooling bath consisting of water or a mixture thereof with a water-soluble latent solvent and subjecting the dope to membrane formation wherein the cross-sectional bulk layer is formed mainly by thermally-induced phase separation and the outer layer is formed mainly by nonsolvent-induced phase separation.

The present invention describes a process and respective installation for continuous production of foamed polymeric sheets by extrusion, another object of the invention being the development and use of polypropylene-based formulations comprising linear polypropylenes and branched polypropylenes. The installation includes four stages: a first stage of extrusion foaming, in which a foaming agent, either of a chemical or physical nature, in the latter case introduced in supercritical conditions, is mixed with the polymeric mass melted previously in the first stages of the extruder, the material expanding exactly at the outlet of the lips of the planar extrusion head; a second stage of calibration and cooling of the foamed sheet, in which the expanded plastic material is cooled by contact in a system of vacuum calibrators and by contact with water in a cooling bath; a stage of collection of the foamed panel; and a final stage of cutting of the foamed sheet, defining the final dimensions thereof.

A method of producing a hollow fiber membrane includes discharging a polyvinylidene fluoride solution comprising a polyvinylidene fluoride resin and a poor solvent at a temperature above a phase separation temperature into a cooling bath at a temperature below the phase separation temperature to coagulate the polyvinylidene fluoride resin. The hollow fiber membrane comprises a polyvinylidene fluoride resin having spherical structures that have an average diameter in the range of 0.3 to 30 μm.

The invention discloses a method for preparing a reinforced hollow fiber membrane of a braided tube by using a low-temperature thermal-induced phase separation method. The method comprises the following steps of: 1) mixing polymer with a diluting agent, heating and dissolving, and configuring polymer solution; 2) coating the polymer solution onto the surface of the braided tube; and 3) generating thermal-induced phase separation in cooling bath and successively removing the diluting agent in an extracting agent to prepare the reinforced hollow fiber membrane of the braided tube. The invention has the beneficial effects that as the diluting agent capable of dissolving the polymer at a lower temperature is adopted in the method, the destructive effect caused by high temperature required by the conventional thermal-induced phase separation method on a braided tube structure can be prevented; the invention provides a new process for preparing the reinforced hollow fiber membrane of the braided tube by using the thermal-induced phase separation method with good universality for braided tube materials; and the prepared reinforced hollow fiber membrane of the braided tube has high strength and is low in cost.

The invention discloses a method for preparing a hollow fiber nanofiltration membrane by using a thermally induced phase separation/interface cross linking synchronization method; the preparation method comprises the following steps: 1) mixing polymer, a diluting agent and a cross linking agent to form a homogeneous phase membrane casting solution; 2) extruding the membrane casting solution and core solution, or the membrane casting solution and nitrogen by a ring-shaped spinning head, then conducting the thermally induced phase separation in a cooling bath so as to obtain a hollow primary membrane; 3) soaking the hollow primary membrane in extracting solution containing cross linking pre-polymer, conducting the interface cross linking at the same time with removing diluting agent, thereby obtaining a hollow fiber nanofiltration membrane. According to the method provided by the invention, the preparations of holing and separation layer is finished, and the difficulty point of high require of bonding property between a separation layer and a supporting layer of a combining method in the prior art can be avoided, and meanwhile the thickness and the evenness of the separation layer are easy to control; the simple new method for preparing the hollow fiber nanofiltration membrane with excellent property by using the thermally induced phase separation/interface cross linking synchronization method is provided; and the prepared nanofiltration membrane is little in defect, high in stability and high in controllability.

A multi-bath apparatus and method for cooling a superconductor includes both a cooling bath comprising a first cryogen and a shield bath comprising a second cryogen. The cooling bath surrounds the superconductor, and the shield bath surrounds the cooling bath. The cooling bath is maintained at a first pressure and subcooled, while the shield bath is maintained at a second pressure and saturated. The cooling bath and the shield bath are in a thermal relationship with one another, and the first pressure is greater the second pressure. Preferably, the cryogens are liquid nitrogen, and the superconductor is a high temperature superconductor, such as a current limiter. Following a thermal disruption to the superconductor, the first pressure is restored to the cooling bath and the second pressure is restored to the shield bath in order to restore the superconductor to a superconductive state.

A forming method of a chalcogenide glass aspherical lens is disclosed. The method includes: a) subjecting a chalcogenide glass prefabricated part to three times of heating in a preheating device to raise the temperature of the prefabricated part from room temperature to a temperature T1, with the temperature T1 being near the yield temperature At of the material; b) maintaining the temperature of a cavity and a core at T2 under the actions of heating elements, with the temperature T2 being 5-10 DEG C lower than the conversion temperature Tg of the material, transferring the prefabricated part having the temperature T1 into a mould pressing cavity formed by the cavity and the core; maintaining the temperature of the prefabricated part to be around the yield temperature At of the material, and applying a pressing force P1 on to the cavity and the core simultaneously for a time period of t1 to allow the prefabricated part to be turned into the chalcogenide glass aspherical lens by mould pressing; c) maintaining the pressing force P1 for a time period of t2, and cooling the temperature of the forming mould and the chalcogenide glass aspherical lens to a temperature T3; d) transferring the chalcogenide glass aspherical lens to a cooling bath, performing three times of cooling to cool the chalcogenide glass aspherical lens from the temperature T3 to room temperature, and taking the chalcogenide glass aspherical lens out; and e) putting the chalcogenide glass aspherical lens into a tempering device and tempering for 12-36 h.

A manufacturing method of biodegradable net-shaped articles includes: (a) preparing a biodegradable mixture; (b) granulating the mixture into plastic grains; (c) baking the plastic grains in an oven at 60° C. to 70° C. for 3 to 4 hours; (d) melting and extruding the plastic grains by a screw-type extruder so as to obtain a net-shaped preform; and (e) cooling and thereby finalizing the net-shaped preform in a cooling bath at 15° C. to 30° C. so as to obtain the net-shaped article.

The invention discloses a test system for monitoring the process of land fill gas and leachate transmission, comprising a pulsation-free pump, an air compressor, a pressure earth column, a rainfall earth column, a temperature control earth column, a natural earth column and a computer, wherein, a pressure transducer, a liquid volume metering vessel, a temperature pickup and a pair of scales are respectively connected with the computer; a valve is respectively connected with the air compressor and a filter; a gas mass flowmeter is respectively connected with the pair of scales and the computer; the pressure earth column is respectively connected with a piston and the valve; the rainfall earth column is respectively connected with the piston and the valve; the temperature control earth column is respectively connected with a piston heating bath and a piston cooling bath; the natural earth column is connected with the valve; a piston vessel is connected with the valve. The invention is simple in structure, convenient in operation and accurate in test data with shortened test period, high precision of test data and quick automatic data acquisition.