A kind of hydrophilic modified network cross-linked porous film and its preparation method

A technology of network cross-linking and hydrophilic modification, applied in the field of water treatment, can solve the problems of decreased flux, difficult process control, low efficiency, etc., and achieves the effects of good hydrophilicity and simple and easy preparation method.

Active Publication Date: 2018-11-30
TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN 200910076285 and CN 201110415045 all proposed the problem of applying network cross-linking structure, but they belong to the surface modification of porous membrane. It is easy to cause problems such as pore size reduction and flux decline. Not only that, although the hydrophilicity is improved during the long-term operation, the operation effect is not significantly improved, and the operation effect is even deteriorated.

Method used

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  • A kind of hydrophilic modified network cross-linked porous film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1: Preparation of hydrophilic modified network cross-linked porous membrane

[0074] The implementation steps of this embodiment are as follows:

[0075] A. Preparation of casting solution

[0076] Mix 5 parts by weight of polyvinylidene fluoride resin, 22 parts by weight of PVPk15 additive and 68 parts by weight of dimethylacetamide solvent to obtain the casting solution;

[0077] B. Add network crosslinking

[0078] According to 1.6% of the weight of the casting solution, add the cross-linked sulfonated polysulfone network cross-linked product to the casting solution obtained in step A, stir and mix, and carry out vacuum under the conditions of temperature 100°C and pressure 0.01MPa defoaming, followed by conventional non-solvent gel membrane forming method to obtain the porous membrane of the hydrophilic modified network cross-linked product.

Embodiment 2

[0079] Example 2: Preparation of hydrophilic modified network cross-linked porous membrane

[0080] The implementation steps of this embodiment are as follows:

[0081] A. Preparation of casting solution

[0082] 24 parts by weight of polyethylene resin, 28 parts by weight of PVPk17 additive and 50 parts by weight of dimethylformamide solvent are uniformly mixed to obtain the casting solution;

[0083] B. Add network crosslinking

[0084] According to 7.8% of the weight of the casting solution, add the cross-linked sulfonated polyethersulfone network cross-linked product to the casting solution obtained in step A, stir and mix, and carry out under the conditions of temperature 30°C and pressure 0.08MPa Vacuum defoaming, followed by conventional non-solvent gel film-forming method to form a film to obtain the porous film of the hydrophilic modified network cross-linked product.

Embodiment 3

[0085] Example 3: Preparation of hydrophilic modified network cross-linked porous membrane

[0086] The implementation steps of this embodiment are as follows:

[0087] A. Preparation of casting solution

[0088] 0.1 parts by weight of polypropylene resin, 10 parts by weight of PVPk30 additive and 56 parts by weight of methylpyrrolidone solvent were uniformly mixed to obtain the casting solution;

[0089] B. Add network crosslinking

[0090] Add the cross-linked sulfonated polyether ether sulfone network cross-linked product to the casting solution obtained in step A according to 0.1% of the weight of the casting solution, stir and mix well, under the conditions of temperature 130°C and pressure 0.10MPa Vacuum defoaming is carried out, and then a conventional non-solvent gel film-forming method is used to form a film to obtain the porous film of the hydrophilic modified network cross-linked product.

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Abstract

The invention relates to a hydrophilically modified porous membrane containing a network crosslinked polymer and a preparation method of the porous membrane. The preparation method comprises steps as follows: preparing a film casting liquid, adding the network crosslinked polymer, preparing the membrane and the like. The hydrophilically modified porous membrane containing the network crosslinked polymer solves the technical problems that the efficiency is low, the process is difficult to control, a waste liquid is difficult to treat, the pore size is reduced, the flux is decreased, the hydrophilia is not obvious in operation effect though the efficiency is high, the process is easy to operate and is improved and the like. Therefore, the preparation method is conducive to industrial application and promotion and has a very good application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of water treatment. More specifically, the present invention relates to a porous membrane of a hydrophilic modified cross-linked network, and a method for preparing the porous membrane of a hydrophilic modified cross-linked network. 【Background technique】 [0002] The porous membrane has a screening effect and is pressure-driven. Its separation efficiency is controlled by the pore size and pore size distribution of the membrane. It is widely used in water purification, separation of special small molecules in food, pharmaceutical, biological and other industries. The membrane materials of porous membranes are mainly cellulose and its derivatives, polycarbonate, polyvinyl chloride, polyvinylidene fluoride, polysulfone, polyacrylonitrile, polyamide, polysulfone amide, sulfonated polysulfone, cross-linked polysulfone Vinyl alcohol, modified acrylic polymer, etc. [0003] The existing porous membrane require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/68B01D71/66C02F1/44
CPCB01D67/0011B01D67/0013B01D71/66B01D71/68B01D2323/30B01D2325/36C02F1/44
Inventor 陈亦力张向涛代攀彭兴峥李新涛
Owner TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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