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Preparation method for microporous membrane having multi-scale gradient micro-structure surface

A microporous membrane and multi-scale technology, applied in the field of membrane separation, can solve problems such as surface roughness, singleness, and mechanical property defects, and achieve the effects of high mechanical properties of the membrane, simple process, and controllable membrane area

Active Publication Date: 2014-03-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent with application number 201210305280.8 discloses a method for preparing a superhydrophobic and superoleophilic polymer film. In fact, it has a certain etching effect on PVDF, resulting in rough surface, and because the substrate and inner support are not used, the mechanical properties of the film are still defective, and the film only has a single characteristic of super hydrophobic and super lipophilic

Method used

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  • Preparation method for microporous membrane having multi-scale gradient micro-structure surface
  • Preparation method for microporous membrane having multi-scale gradient micro-structure surface
  • Preparation method for microporous membrane having multi-scale gradient micro-structure surface

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Step (1). Dissolve 15g of polyvinylidene fluoride in 85g of triethyl phosphate, stir at 80°C for 24 hours at a stirring speed of 500 rpm to obtain 100g of a homogeneous solution;

[0033] Step (2). Such as Figure 4As shown, the 90g / m 2 Polyethylene terephthalate non-woven fabric is fixed as the first layer, 10-mesh polyester is fixed on the upper surface of the first layer, and 10-mesh polyester is used as the second layer, and then the prepared uniform solution is taken off by standing. After soaking for 12 hours, evenly coat the upper surface of the second layer. During the coating process, the thickness of the solution is constant at 200 μm, and the coating speed is fixed at 50 mm / s;

[0034] Step (3). The polyethylene terephthalate non-woven fabric coated with the polymer solution is transferred to a 25°C coagulation bath and immersed for 5s, then transferred to a 25°C deionized water bath, and immersed for 24 hours to polymerize The solidification solution is so...

Embodiment 2

[0039] Step (1). Dissolve 20g of polysulfone and 4g of polyethylene glycol 600 in 76g of N,N-dimethylacetamide, stir at 60°C for 12 hours at a stirring speed of 700 rpm to obtain 100g of a homogeneous solution ;

[0040] Step (2). Add 120g / m 2 The polypropylene non-woven fabric is fixed as the first layer, 2000 mesh polypropylene fiber is fixed on the upper surface of the first layer, and the 2000 mesh polypropylene fiber is used as the second layer. On the upper surface of the second layer, the thickness of the solution is kept constant at 300 μm during the coating process, and the coating speed is fixed at 20 mm / s;

[0041] Step (3). The polypropylene non-woven fabric coated with the polymer solution is directly transferred to a 25° C. deionized water bath, and submerged for 12 hours to solidify the polymer solution into a film;

[0042] Step (4). Separate the polypropylene non-woven fabric and the polymer microporous membrane in a wet state at a mechanical peeling speed o...

Embodiment 3

[0045] Step (1). Dissolve 10 g of cellulose acetate and 6 g of polyethylene glycol 200 in 84 g of N, N-dimethylformamide, stir at 60° C. for 24 hours at a stirring speed of 500 rpm to obtain 100 g of a homogeneous solution ;

[0046] Step (2). Add 60g / m 2 The high-density polyethylene woven fabric is fixed as the first layer, 100-mesh nylon is fixed on the upper surface of the first layer, and 100-mesh nylon is used as the second layer. Coating on the upper surface of the second layer, the thickness of the solution is constant at 100 μm during the coating process, and the coating speed is fixed at 100 mm / s;

[0047] Step (3). The high-density polyethylene woven fabric coated with the polymer solution is directly transferred to a 35° C. deionized water bath, and immersed for 18 hours to solidify the polymer solution into a film;

[0048] Step (4). After the polymer microporous membrane with high-density polyethylene woven fabric is naturally dried in the air, remove the high-...

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Abstract

The present invention relates to a preparation method for a microporous membrane having a multi-scale gradient micro-structure surface. The method comprises: fixing a screen mesh on the upper surface of a rough flexible substrate, coating a polymer solution layer with a thickness of 50-500 mum on the upper surface of the screen mesh at a constant speed, curing, washing, and carrying out simple mechanical peeling to remove the rough flexible substrate to obtain the microporous membrane having the multi-scale gradient micro-structure surface. According to the present invention, the process of the method is simple, the membrane area can be controlled, continuous production can be achieved, mechanical properties of the membrane are high, and the membrane has super-hydrophobic or super-hydrophilic property, wherein the super-hydrophobic membrane has super-lipophilic property, and the super-hydrophilic membrane has super-oleophobic property under water and has super-hydrophobic property under oil; and the obtained membrane can be adopted to effectively separate various oil and water mixtures including nano-scale oil water emulsions, and can further be used in fields of self-cleaning ultrafiltration / microfiltration membrane sewage treatments, medical sterilization, food turbidity removal, sterilization, material separation, membrane distillation, and the like.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a preparation method of a microporous membrane with a multi-scale gradient microstructure surface. Background technique [0002] Due to the increasingly serious environmental pollution, oil-water separation has become a difficult problem facing the world and has received extensive attention. Traditional separation methods such as centrifugation, flocculation, flotation, etc. (A. Lobo, á. Cambiella, J. M. Benito, C. Pazos and J. Coca, Journal of Membrane Science, 2006, 278, 328-334) are only suitable for layering The oil-water mixture cannot completely treat the oil-water emulsion, and there are disadvantages such as complicated process and high energy consumption. As an efficient membrane separation technology, ultrafiltration and microfiltration can effectively intercept emulsified oil droplets or emulsified water droplets through the pore size screening mechanism to ...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/34B01D71/42B01D71/30B01D71/16B01D71/40B01D71/26B01D71/56B01D67/00B01D69/02
Inventor 刘富薛立新陶咪咪
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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