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Hydrophobic/hydrophilic composite membrane with nuclear track etching membrane as base membrane as well as preparation method and application of same

A nuclear track etching, composite membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of limiting the application of hydrophobic/hydrophilic composite membranes, cumbersome preparation, etc., and achieve excellent physical and mechanical properties. The effect of low rate and random dispersion of pore distribution

Inactive Publication Date: 2020-11-03
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the preparation of hydrophobic / hydrophilic composite membranes in the prior art is relatively cumbersome. Composite membranes need to treat the hydrophobic layer or hydrophilic layer separately, or select special temperature-sensitive polymer materials that have the characteristics of hydrophilic / hydrophobic transition with temperature changes
This greatly limits the application of hydrophobic / hydrophilic composite membranes in the field of membrane distillation.

Method used

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  • Hydrophobic/hydrophilic composite membrane with nuclear track etching membrane as base membrane as well as preparation method and application of same
  • Hydrophobic/hydrophilic composite membrane with nuclear track etching membrane as base membrane as well as preparation method and application of same
  • Hydrophobic/hydrophilic composite membrane with nuclear track etching membrane as base membrane as well as preparation method and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 prepared a hydrophobic / hydrophilic composite membrane sample 1, the specific preparation process is as follows:

[0050] (1) The mass fraction of polyvinylidene fluoride is 15%, the solvent DMAc79%, and the additives are: Licl3% and acetone 3%;

[0051] (2) Add the mixed raw materials weighed in step (1) into the reactor, and stir electrically for about 12 hours in a constant temperature water bath at 60°C to form a uniform and stable casting solution, which is left to stand at room temperature for defoaming for 12 hours to obtain a homogeneous casting solution. Membrane fluid;

[0052] (3) Scrape the liquid film of 100 μm on the glass plate that (2) gained film-casting liquid is glued with PET nuclear track film with scraper, immerse earlier 5 minutes in 20% ethanol solution, treat that its phase separation completes taking out and use Rinse with deionized water;

[0053] (4) Transfer the film prepared in step (3) into deionized water and soak for 24 hours,...

Embodiment 2

[0058] Embodiment 2 has prepared hydrophobic / hydrophilic composite membrane sample 2, and concrete preparation process is basically consistent with embodiment 1, and difference only is that the mass fraction of polyvinylidene fluoride, additive Licl, acetone is different in the raw material, mass fraction refers to step ( 1) The mass fraction of each substance in the raw material. The specific preparation conditions are shown in Table 1 below.

[0059] Table 1 Preparation conditions of hydrophobic / hydrophilic composite membrane samples 1 and 2

[0060]

[0061] Wherein the performance test method of hydrophobic / hydrophilic composite membrane sample 2 is also completely consistent with embodiment 1, and the results are as follows:

[0062] The membrane section of the hydrophobic / hydrophilic composite membrane sample 2 has a sponge-like pore structure ( Figure 6 ), the porosity is 37.63%, the average pore diameter is 0.1242μm, and the gas permeability is 0.956L cm -2 cm ...

Embodiment 3-4

[0066] In Example 3-4, the hydrophobic / hydrophilic composite membrane sample 3-4 was prepared, and the specific preparation process was basically the same as that in Example 1, except that the content of additives in the raw materials was slightly different. The specific preparation conditions are shown in Table 2 below.

[0067] Table 2 Preparation conditions of hydrophobic / hydrophilic composite membrane samples 3 and 4

[0068]

[0069]

[0070] Wherein the performance test method of hydrophobic / hydrophilic composite membrane sample 3-4 is also completely consistent with embodiment 1, and the results are as follows:

[0071] The membrane section of the hydrophobic / hydrophilic composite membrane sample 3 has a finger-like pore structure with a large number, and the lower part is a sponge pore structure ( Figure 8 ), the porosity is 37.63%, the average pore diameter is 0.112μm, and the gas permeability is 0.812L·cm -2 cm -1 , The water contact angle is 90.2°, the water...

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Abstract

The invention discloses a hydrophobic / hydrophilic composite membrane taking a nuclear track etching membrane as a base membrane as well as a preparation method and application of the same. The nucleartrack etching membrane is a polyethylene glycol terephthalate nuclear pore membrane, wherein one surface of the hydrophobic / hydrophilic composite membrane is a hydrophobic polyvinylidene fluoride membrane, and the water contact angle is 90-100 degrees; a hydrophilic polyethylene glycol terephthalate nuclear pore membrane is arranged on the other surface of the membrane, and the water contact angle is 55-65 degrees. The hydrophobic / hydrophilic double-layer membrane prepared by the method is narrow and uniform in pore size distribution, good in air permeability and good in mechanical strength.A novel composite membrane structure with excellent performance is provided for membrane distillation, wherein waste heat of low-temperature feed liquid is fully utilized for direct contact type membrane distillation, concentration and separation, and the permeation flux and the heat efficiency of the process are improved. The prepared hydrophobic / hydrophilic composite membrane is good in application effect in direct contact membrane distillation and stable in operation; compared with a PVDF hydrophobic membrane supported by polyester non-woven fabric, the permeation flux of the hydrophobic / hydrophilic composite membrane is increased by 23.70%.

Description

technical field [0001] The invention belongs to the technical field of polymer material science and membrane separation, relates to a preparation method of a polymer separation membrane, and more particularly relates to a hydrophobic / hydrophilic composite membrane with a nuclear track etching membrane as a base membrane and its Preparation methods and applications. Background technique [0002] Membrane distillation (MD, membrane distillation) is a new membrane separation technology that has emerged in recent years. It relies on hydrophobic microporous membranes to use the saturated vapor pressure difference on both sides of the membrane as the driving force for mass transfer. It can be applied to seawater desalination, wastewater treatment, azeotropic Mixture separation and other technical fields. Compared with other membrane separations, the advantage is that the equipment is simple, easy to operate, and can effectively use cheap energy such as solar energy, geothermal he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/34B01D71/50B01D61/36
CPCB01D69/12B01D71/50B01D71/34B01D61/364B01D67/0016B01D67/0013B01D67/0011B01D2325/36B01D2325/38
Inventor 项军唐娜陈乃麟程鹏高张蕾杜威王松博张建平
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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