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Method for preparing hydrophilic electrical charge separation film by using one-step method as well as product and application thereof

A separation membrane and hydrophilic technology, applied in the field of microfiltration membrane, can solve the problem of lack of inorganic salt interception performance, and achieve the effect of enhancing anti-pollution performance, improving hydrophilicity, and saving complicated steps

Active Publication Date: 2013-04-24
BEIJING ORIGINWATER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the in-situ polymerized monomers used in this method are hydroxyalkyl methacrylate compounds, and such compounds are basically electrically neutral, so the polymer modified membrane formed only increases its hydrophilicity, but the membrane The surface is not charged, so the selective separation characteristics of the membrane, especially the interception performance of inorganic salts are lacking

Method used

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  • Method for preparing hydrophilic electrical charge separation film by using one-step method as well as product and application thereof
  • Method for preparing hydrophilic electrical charge separation film by using one-step method as well as product and application thereof
  • Method for preparing hydrophilic electrical charge separation film by using one-step method as well as product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Preparation of hydrophilic charged separation membrane

[0047] In parts by weight, 15 parts of polyvinylidene fluoride, 70 parts of N,N-dimethylpyrrolidone, 0.05 parts of benzoyl peroxide, 7.5 parts of dimethylaminoethyl methacrylate and 5 parts of porogen The polyethylene glycol was mixed, and the in-situ polymerization was carried out at a temperature of 60°C for 16 hours. Then let it stand at room temperature 25°C for 20 hours to defoam, then pour it into a gel bath, and let it stand at 20°C for 1 hour to obtain a phase-separated membrane; finally immerse it in a water bath and let it stand at 80°C for 1 hour. A hydrophilic positively charged separation membrane is obtained.

[0048] The thickness of the hydrophilic charged separation membrane is 0.5mm and the water flux is 2500L / m 2 .h, the average pore diameter is 0.01 microns, and the tensile strength is 1.2MPa.

Embodiment 2

[0049] Example 2: Preparation of hydrophilic charged separation membrane

[0050] In parts by weight, take 18 parts of polytetrafluoroethylene, 60 parts of N-methylpyrrolidone, 0.07 parts of azobisisoheptonitrile, 7 parts of acryloxyethyl trimethylammonium chloride and 4 parts of porogen Mix with Tween 80 and perform in-situ polymerization at a temperature of 99°C for 2 hours. Then let it stand at 20°C for 36 hours to defoam, then pour it into a gel bath, and let it stand at 80°C for 0.5 hours to obtain a phase-separated membrane; finally, pour it into a water bath and let it stand at 80°C for 1 hour to get Hydrophilic positively charged separation membrane.

[0051] The thickness of the hydrophilic charged separation membrane is 0.5mm and the water flux is 2800L / m 2 .h, the average pore diameter is 0.01 microns, and the tensile strength is 1.6MPa.

Embodiment 3

[0052] Example 3: Preparation of hydrophilic charged separation membrane

[0053] Carry out the same method as Example 2, except that the film-making resin is 7 parts polyethylene, 90 parts N-methylpyrrolidone, 0.09 peroxycarbonate, 1 part dimethyldiallylammonium chloride and 1 part Tween 80 , Get a hydrophilic positively charged separation membrane.

[0054] The thickness of the hydrophilic charged separation membrane is 0.5 mm and the water flux is 2600L / m 2 .h, the average pore diameter is 0.01 microns, and the tensile strength is 1.5MPa.

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Abstract

The invention relates to a preparation method a hydrophilic electrical charge separation film. The preparation method comprises the following steps of: carrying out in-situ polymerization reaction to obtain a film-making solution by taking film-making resin, a solvent, a free radical polymerization initiator, an in-situ polymerization monomer and a pore-foaming agent as raw materials; and carrying out the conventional processes of de-foaming, molding and the like so as to obtain the hydrophilic electrical charge separation film. A porous separation film prepared by using the method disclosed by the invention has the ultrahigh pure water flux and the hydrophilism is greatly improved; the attenuation speed of the film in sewage is greatly reduced; and meanwhile, electrical charges are uniformly arranged on the surface of the film and the film is subjected to the electrical charge modification in the film forming process, so that the retention rate of the film to charged substances in the sewage is obviously improved. The hydrophilic electrical charge separation film prepared by using the method disclosed by the invention can be used for treatment on municipal sewage, domestic sewage and industrial wastewater.

Description

【Technical Field】 [0001] The invention relates to the technical field of microfiltration membranes. More specifically, the present invention relates to a production method of a hydrophilic charged separation membrane, and the products obtained by the method and uses. 【Background technique】 [0002] The membrane separation process is generally valued because of its high efficiency, simplicity and energy saving. In particular, the known microfiltration membranes have been widely used in the fields of chemical industry, medicine, food, electronics and other industrial technologies. They are used for water purification, separation and recycling. Most polymer membranes are non-polar membranes, and the surface has no hydrogen bond with water, so it has strong hydrophobicity. In the water phase separation, it is easy to adsorb hydrophobic substances such as proteins and colloidal particles in the water, which can cause the membrane pores to be blocked and cause membrane fouling. Memb...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/34B01D71/36B01D71/26B01D71/68B01D71/42B01D67/00C02F1/44
Inventor 陈亦力文剑平李天玉李锁定彭鹏
Owner BEIJING ORIGINWATER TECH CO LTD
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