Composite microporous membrane with asymmetric pore structure and preparation method thereof

A microporous membrane, asymmetric technology, applied in the field of microporous membranes, can solve the problems of bulky membrane elements, complex preparation process, high maintenance cost, etc., and achieve the effect of simple preparation process, thin thickness, and reduced maintenance cost

Active Publication Date: 2022-05-17
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reverse osmosis and nanofiltration membranes used for water treatment basically use three-layer composite membranes of non-woven fabrics, polysulfone membranes and polyamide desalination layers. The thickness of this membrane is basically about 110nm, and the preparation process is complicated. Imported, the prepared membrane elements are bulky, low in efficiency and high in maintenance costs in practical applications

Method used

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  • Composite microporous membrane with asymmetric pore structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The preparation method of polyethylene wet-process diaphragm / polyethylene wet-process diaphragm composite microporous membrane is as follows:

[0058] S1. Preparation of mechanical support layer: Preparation of polyethylene wet-process separator

[0059] A. Blending and extrusion: mixing polyethylene resin and processing aids and introducing them into a twin-screw extruder to melt and extrude to obtain a melt;

[0060] B. Cast sheet cooling: cooling and crystallizing the extruded melt to obtain a gel sheet;

[0061] C. Stretching: Stretch the gel sheet 4 times longitudinally and then 4 times transversely at a temperature of 70°C to obtain a stretched film;

[0062] D. Extraction: immerse the stretched film in a dichloromethane solution for extraction, so that the processing aid therein is separated from the film body to obtain a mechanical support layer;

[0063] S2. Preparation of filter layer: preparation of polyethylene wet-process membrane

[0064] A. Blending an...

Embodiment 2

[0072] The preparation method of polyethylene wet-process diaphragm / polyethylene wet-process diaphragm composite microporous membrane is as follows:

[0073] S1. Preparation of mechanical support layer: Preparation of polyethylene wet-process separator

[0074] A. Blending and extrusion: mixing polyethylene resin and processing aids and introducing them into a twin-screw extruder to melt and extrude to obtain a melt;

[0075] B. Cast sheet cooling: cooling and crystallizing the extruded melt to obtain a gel sheet;

[0076] C. Stretching: Stretch the gel sheet 4 times longitudinally and then 4 times transversely at a temperature of 85°C to obtain a stretched film;

[0077] D. Extraction: immerse the stretched film in a dichloromethane solution for extraction, so that the processing aid therein is separated from the film body to obtain a mechanical support layer;

[0078] S2. Preparation of filter layer: preparation of polyethylene wet-process membrane

[0079] A. Blending an...

Embodiment 3

[0088] The preparation method of polyethylene wet-process diaphragm / polyethylene wet-process diaphragm composite microporous membrane is as follows:

[0089] S1. Preparation of mechanical support layer: Preparation of polyethylene wet-process separator

[0090] A. Blending and extrusion: mixing polyethylene resin and processing aids and introducing them into a twin-screw extruder to melt and extrude to obtain a melt;

[0091] B. Cast sheet cooling: cooling and crystallizing the extruded melt to obtain a gel sheet;

[0092] C. Stretching: Stretch the gel sheet 4 times longitudinally and then 4 times transversely at a temperature of 110°C to obtain a stretched film;

[0093] D. Extraction: immerse the stretched film in a dichloromethane solution for extraction, so that the processing aid therein is separated from the film body to obtain a mechanical support layer;

[0094] S2. Preparation of filter layer: preparation of polyethylene wet-process membrane

[0095] A. Blending a...

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Abstract

The invention discloses an asymmetric pore structure composite microporous membrane and a preparation method thereof. The preparation method is to prepare a mechanical support layer and a filter layer with a microporous structure by uniaxial stretching or biaxial stretching, and control the average pore size of the mechanical support layer and the filter layer by controlling the stretching ratio and hot pressing temperature and film thickness; the mechanical support layer in the present invention, the pore size of filter layer, the porosity difference is bigger, the mechanical support layer and one or more filter layers are compounded by high temperature hot pressing, the composite microporous that prepares The membrane has an asymmetric pore structure, and the composite microporous membrane has a smaller pore size, which can perform reverse osmosis / nanofiltration operations on water samples with higher packing densities, greatly improving the water treatment effect.

Description

technical field [0001] The invention relates to the technical field of microporous membranes, in particular to a composite microporous membrane with an asymmetric pore structure and a preparation method thereof. Background technique [0002] Membrane separation technology is an emerging high-end treatment technology, which can not only separate and purify various components, but also does not produce any environmental pollution and other negative effects in the whole process; in today's increasingly scarce water resources, people The demand for fresh water is increasing, but the earth's fresh water resources are very limited, while the amount of other water, such as seawater, domestic wastewater, industrial wastewater, etc. is very large, so extracting usable fresh water from these waters has become a global consensus. At present, the reverse osmosis and nanofiltration membranes used for water treatment basically use three-layer composite membranes of non-woven fabrics, pol...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D67/00B01D69/10B01D71/36
CPCB01D71/36B01D69/10B01D67/0002B01D2325/022Y02A20/131
Inventor刘涛涛翁星星贾培梁沈亚定
OwnerJIANGSU HORIZON NEW ENERGY TECH CO LTD