Preparation method and application of anti-pollution hydrophilic separating membrane

A separation membrane and anti-pollution technology, applied in the field of separation membranes, can solve the problems of shedding, easy washing of the hydrophilic phase, etc., and achieve the effects of cost saving, easy industrialization, and mild conditions

Active Publication Date: 2014-01-01
YANTAI LVSHUIFU MEMBRANE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention mainly solves the problem that the blended and modified hydrophilic phase is easy to wash out and fall off during the preparation and application of the anti-pollution sep...

Method used

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  • Preparation method and application of anti-pollution hydrophilic separating membrane
  • Preparation method and application of anti-pollution hydrophilic separating membrane
  • Preparation method and application of anti-pollution hydrophilic separating membrane

Examples

Experimental program
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Effect test

Embodiment 1-4

[0033] The preparation method of the hydrophilic separation membrane of the present embodiment is carried out according to the following steps:

[0034] (1) Add 15 parts of polysulfone by weight, 0.1 part of polyethylene glycol (molecular weight 10,000g / mol), 0.05 parts of dopamine and 85 parts of N,N-dimethylformamide into the dissolution tank , at different temperatures (25°C, 45°C, 65°C, 85°C), stirring and dissolving for 2 hours, standing for defoaming for 4 hours, and making a casting solution;

[0035] (2) Adjust the pH of the water coagulation bath to 8.5 by adding phosphate buffer;

[0036] (3) cast the casting solution on a flat plate to form a liquid film, and then soak it in a coagulation bath for 10 minutes to obtain a hydrophilic polymer flat film;

[0037] (4) Soak the separation membrane prepared in step (3) in 15% Tween-20 aqueous solution for 50 minutes, and then dry it to assemble the membrane module.

Embodiment 5-9

[0039] The preparation method of the hydrophilic separation membrane of the present embodiment is carried out according to the following steps:

[0040] (1) 20 parts, 30 parts, 40 parts, 50 parts and 60 parts of polyvinylidene fluoride material, 3 parts of polyvinylidene fluoride-polyvinyl alcohol copolymer, 1 part of 3,4-di Hydroxybenzaldehyde and 80 parts by weight of DMF were added into a dissolving tank, stirred and dissolved for 12 hours at 100° C., left to stand for defoaming for 8 hours, and made into a casting solution;

[0041] (2) Add 5 parts of potassium persulfate to the water coagulation bath containing 3% N,N-dimethylformamide and N-methylpyrrolidone;

[0042] (3) The casting solution is spun on a hollow fiber membrane spinning machine, and then soaked in a coagulation bath for 12 hours to obtain a hollow fiber membrane;

[0043] (4) The separation membrane prepared in step (3) was soaked in 40% glycerol aqueous solution for 3 hours, and then dried to assemble t...

Embodiment 10-13

[0045] The preparation method of the hydrophilic polymer membrane of the present embodiment is carried out in the following steps:

[0046] (1) Divide the weight into 20 parts of polyacrylonitrile, 1 part of different hydrophilic materials (polyethylene glycol, polymethylmethacrylate, polyvinylpyrrolidone, polyvinyl alcohol), 1 part of 3,4-dihydroxy Phenylacetic acid and 80 parts of DMAC were added into the dissolution tank, stirred and dissolved for 48 hours at 30°C, and left to stand for defoaming for 24 hours to make a casting solution;

[0047] (2) Add 2 parts of phenol to the pure water coagulation bath;

[0048] (3) The casting liquid is spun on a hollow fiber membrane spinning machine, and then soaked in a coagulation bath for 48 hours to obtain a hollow fiber membrane;

[0049] (4) Soak the separation membrane prepared in step (3) in 15% Tween-80 aqueous solution for 24 hours, and then dry it to assemble the membrane module.

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Abstract

The invention discloses a preparation method and an application of an anti-pollution hydrophilic separating membrane. The preparation method is characterized in that a pyrocatechol derivative is used as an accelerant and a curing agent between a separating membrane material and a hydrophilic material, when blending casting film liquid of the separating membrane is prepared, the pyrocatechol derivative is added to blending liquid of the separating membrane material and the hydrophilic material, and the pyrocatechol derivative is subjected to polymerization cross-linking in a phase conversion process of the membrane preparation, so that the effect of fixing the hydrophilic material is achieved. The preparation method of the anti-pollution hydrophilic separating membrane has strong universality and is suitable for the blending of multiple hydrophilic materials and multiple membrane materials. The preparation method is simple, easy to operate, mild in conditions, economic, high-efficiency, environmentally-friendly, easy for industrialization and suitable for the preparation of multi-functional hydrophilic micro-filtration membranes, ultra-filtration membranes, nano-filtration membranes, reverse-osmosis membranes, positive-osmosis membranes, pressure-delay osmosis membranes, pervaporation membranes and the like which are used for liquid and gas separation and membrane reactors.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a preparation method of an antifouling polymer separation membrane. The separation membrane prepared by the method increases the water flux of the membrane, improves the pollution resistance of the membrane, and improves the biocompatibility of the membrane. It can be used for separation and purification of liquid or gas, dialysis or filtration of blood purification, purification and separation of various macromolecules such as drugs and proteins, catalysis of liquid and gas reactions, and water purification for removal of various inorganic salts, wastewater treatment and seawater Fade etc. Background technique [0002] With the wide application and development of separation membrane technology, polymers are the main membrane materials, and the research on their properties has become a focus of attention. Organic separation membrane is a polymer organic chemical ma...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D71/68B01D71/34B01D71/42B01D71/38
Inventor 胡云霞徐卫星
Owner YANTAI LVSHUIFU MEMBRANE MATERIAL
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