Water treatment porous membrane and preparation method thereof

A porous membrane and water treatment technology, which is applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, membranes, etc., can solve the problems of complex preparation process, poor durability, and poor hydrophilicity, so as to reduce manufacturing costs and improve Hydrophilic properties, performance-enhancing effects

Pending Publication Date: 2018-10-09
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a water treatment porous membrane and a preparation method thereof, which are used to solve the problem of the poor durability of the water treatment porous membrane in the prior art, the complicated preparation process, the membrane The thickness is thicker, the pore size is larger, and the hydrophilicity is poor

Method used

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  • Water treatment porous membrane and preparation method thereof

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preparation example Construction

[0048] like figure 1 As shown, the present invention also provides a method for preparing a water treatment porous membrane. Using the preparation method, the above water treatment porous membrane can be prepared, and the preparation method at least includes:

[0049] S1, mixing high molecular weight polyethylene, water-soluble polymer, pore forming agent and antioxidant, and stirring uniformly to form a mixture, wherein the average molecular weight of the high molecular weight polyethylene is between 1.0×10 5 ~10.0×10 6 Between, the density is between 0.940g / cm 3 ~0.976g / cm 3 between;

[0050] S2, using a twin-screw extrusion process to dissolve the high molecular weight polyethylene, antioxidant and water-soluble polymer in the pore-forming agent at a certain temperature to form a mixture, and then extrude the mixture;

[0051] S3, casting the mixture into ribbons;

[0052] S4, extracting and removing the pore-forming agent in the strip, stretching the strip to form a f...

Embodiment 1

[0076] The density of 100 grams is 0.957g / cm 3 The average molecular weight is 5.0×105 High molecular weight polyethylene, 0.5 g antioxidant,

[0077] Add 5 grams of polyethylene oxide and 250 grams of mineral oil into the continuous batching feeder, stir at a speed of 50 rpm, and mix the raw materials evenly.

[0078] The mixture is continuously fed into the twin-screw extruder, and at 180°C, the high molecular weight polyethylene, antioxidant and polyethylene oxide are continuously dissolved in mineral oil in the twin-screw extruder, and then Continuously extrude at a speed of 200 rpm, the mixture continuously enters the slot die, the mixture is extruded through the slot die to casting cooling rolls, and cast into strips at 80°C.

[0079] Put the obtained ribbon into an extraction tank containing dichloromethane for extraction to remove the mineral oil in the ribbon. Afterwards, the extracted strips are continuously fed into a biaxial stretching machine at 120° C. to be st...

Embodiment 2

[0083] The density of 100 grams is 0.957g / cm 3 The average molecular weight is 5.0×10 5 High molecular weight polyethylene, 0.5 gram of antioxidant, 10 gram of polyoxyethylene, 250 gram of mineral oils are added in the continuous batching feed kettle, stir at a speed of 50 rpm, and the raw materials are mixed evenly.

[0084] The mixture is continuously fed into the twin-screw extruder, and at 180°C, the high molecular weight polyethylene, antioxidant and polyethylene oxide are continuously dissolved in mineral oil in the twin-screw extruder, and then Continuously extrude at a speed of 200 rpm, the mixture continuously enters the slot die, the mixture is extruded through the slot die to casting cooling rolls, and cast into strips at 80°C.

[0085] Put the obtained ribbon into an extraction tank containing dichloromethane for extraction to remove the mineral oil in the ribbon. Afterwards, the extracted strips are continuously fed into a biaxial stretching machine at 120° C. t...

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Abstract

The invention provides a water treatment porous membrane which comprises high molecular weight polyethylene, a water-soluble polymer, a pore-forming agent and an antioxidant, wherein the high molecular weight polyethylene has average molecular weight ranging between 1.0*10<5> and 10.0*10<6> and density of 0.940-0.976 g / cm<3>; on the basis of 100 weight parts of the high molecular weight polyethylene, the weight of the water-soluble polymer is 5-50 parts; the weight of the pore-forming agent is 100-500 parts; the weight of the antioxidant is 0.1-10 parts. The water treatment porous membrane prepared by the invention has the thickness of 5-30 microns, the micropore size of 10-100nm, the porosity of 20-60% and the surface contact angle of 30-95 degrees. The porous membrane disclosed by the invention is excellent in durability, simple in preparation process, small in thickness, uniform and small in particle size distribution, and has an excellent hydrophilic property and filtration and adsorption effects.

Description

technical field [0001] The invention relates to polymer porous membrane technology, in particular to a porous membrane for water treatment and a preparation method thereof. Background technique [0002] Porous membrane is a kind of special film with fine micropore distribution, which is usually used in air filtration and purification, water treatment and purification, or as a special separator for batteries and so on. The preparation of porous membranes usually adopts methods such as uniaxial stretching, biaxial stretching, or phase inversion, and the membrane body usually has pores that penetrate the membrane body, thereby forming a porous membrane. The mechanism of porous membrane filtration and adsorption process can be explained by sieving theory. Aggregate particles or molecules with a particle size smaller than the membrane pores can pass through the membrane pores. Aggregate particles or molecules with a particle size equal to the membrane pores can block the membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D67/00C02F1/44H01M2/16H01M50/411
CPCB01D67/0002B01D71/26C02F1/44B01D2325/36H01M50/411Y02E60/10B01D69/02B01D2323/18B01D67/0025B01D67/0027B01D67/003B01D2325/04B01D2325/028B01D71/08B01D71/44B01D71/38H01M10/0525H01M50/417H01M50/423H01M50/4295H01M50/42H01M50/403B01D2325/02832B01D2325/02833B01D71/261B01D67/0013B01D2325/021B01D2323/02H01M50/406B01D67/00113B01D67/00111B01D67/0083B01D71/74B01D71/12B01D71/441B01D71/381B01D71/401B01D71/403B01D71/5211H01M50/414B01D2325/34B01D2323/12B01D2325/02B01D2323/081B01D2323/2181B01D2323/2182
Inventor 程跃熊磊
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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