A nanofiltration membrane preparation device and production process

Abstract

The invention provides a nanofiltration membrane preparation device and production process. The preparation device includes a horizontal workbench, a base, a casting liquid delivery pump, a hydraulic control valve, a casting liquid container, a casting liquid delivery pipe, and a casting liquid spraying pump. cavity, base plate, casting solution booster chamber, casting solution booster pipe, booster regulating valve and booster pump, casting solution spraying chambers are arranged symmetrically on both sides of the base, casting solution booster chamber is set on the base, and is located on both sides of the casting film In the middle of the liquid spraying chamber, the casting liquid spraying chambers and the casting liquid booster chambers on both sides are arranged in parallel, and the substrates are stacked between the casting liquid spraying chambers and the casting liquid booster chambers. A gap with a certain thickness is formed between them by a thickness adjusting device. The present invention uses the stacking with standard thickness gaps as the reaction chamber of the casting solution to ensure that the produced nanofiltration membrane has extremely high flatness, avoids problems such as pockmarks and pits, and accurately measures the nanofiltration membrane through the thickness adjustment device. The thickness of the filter membrane, and ensure that the thickness of the nanofiltration membrane is uniform.

Description

technical field [0001] This patent relates to the technical field of nanofiltration membrane preparation, in particular to a nanofiltration membrane preparation device and production process with adjustable thickness. Background technique [0002] With the rapid development of science and technology, consumers' requirements for quality of life are constantly improving, especially in the field of daily life. The quality and safety of drinking water are more and more concerned by consumers. There are various water purification equipment on the market. Into thousands of households, and nanofiltration membrane filter element plays a vital role in filtering water quality, the production quality of nanofiltration membrane directly affects the removal of organic matter, pigments and some dissolved salts in water, and nanofiltration membrane The flatness and thickness of the nanofiltration membrane directly affect the water treatment effect of the nanofiltration membrane. Therefore,...

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Problems solved by technology

[0003] In the prior art, the patent with the publication number CN201930900U discloses a coating device for manufacturing a uniform nano-film in a large area. The device sprays the coating through the coating outlet on the coating container, and the coating is sprayed on the surface of the glass on the conveyor belt. , a coating layer is formed on the upper surface of the glass, and the uniformity of the coating layer is related to the flow rate of the jet fluid and the speed of the conveyor belt, and the thickness of the coating layer cannot be measured in real time, the fluid flow rate is too large or the speed of the conveyor belt is too small , it is easy to cause the thickness of the coating layer to be too large, on the contrary, it is easy to cause the thickness of the coating layer to be too small, and it is impossible to produce a film with a specific thickness as required. Pimples and pits affect the flatness of the film

[0004] In the prior art, the patent with publication number CN206746918U discloses a thin film preparation device, which can be used for the preparation of reverse osmosis membrane or nanofiltration membrane. The adjustment mechanism controls the thickness of the film, and the film thickness is adjusted through two sets of air knife components. The thickness adjustment mechanism is a film thickness adjustment roller, which is a cylindrical structure. When the film thickness adjustment roller contacts the film, the cylindrical film thickness adjustment After the film is extruded by the roller, the upper surface of the extruded film will produce a continuous arc along the direction of travel, which is not a regular plane shape, that is, the film after the film thickness adjustment mechanism is not a uniform plane. In addition, the air knife When the component is correcting the thickness of the film, the air knife is at a certain angle with the film, which is easy to scrape the film away from the substrate and cause certain damage to the film

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