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Water filtering diaphragm with asymmetric pore structure and preparation process thereof

A preparation process and pore structure technology, applied in the field of water treatment, can solve the problems of poor filtration efficiency, complex process and high cost, and achieve the effects of improving filtration quality, high filtration performance and low cost

Active Publication Date: 2021-02-02
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional water filtration membranes need to be combined with membranes of different pore sizes. Conventional membranes are generally composed of three layers, which are non-woven fabric layer, polysulfone layer, and polyimide layer. Although this filter membrane has a good filtering effect, However, this kind of water filtration membrane not only has complex process, large thickness, high cost, but also poor filtration efficiency.

Method used

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  • Water filtering diaphragm with asymmetric pore structure and preparation process thereof
  • Water filtering diaphragm with asymmetric pore structure and preparation process thereof
  • Water filtering diaphragm with asymmetric pore structure and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Get 15 mass parts of polyethylene and add 85 mass parts of white oil to prepare a mixed solution;

[0040]2) Melt and knead the mixed solution at a temperature of 160°C, extrude it into a sheet, cast it on a cooled metal roll, and solidify to obtain a gel-like molding;

[0041] 3) Put the gel-like molding in an oven for baking. The oven is provided with an upper temperature field and a lower temperature field. The temperature of the upper temperature field is 100°C, and the temperature of the lower temperature field is 110°C. Stretch along the length direction with a stretching ratio of 5.5 times, and then stretch again along the width direction at a stretching ratio of 14 times;

[0042] Immediately after stretching, place it in an oven with an upper temperature field temperature of 125°C and a lower temperature field temperature of 135°C for heat treatment;

[0043] After the heat treatment, place it in tetrachloromethane for dipping. The tetrachloromethane is div...

Embodiment 2

[0046] 1) Get 15 mass parts of polyethylene and add 85 mass parts of white oil to prepare a mixed solution;

[0047] 2) Melt and knead the mixed solution at a temperature of 160°C, extrude it into a sheet, cast it on a cooled metal roll, and solidify to obtain a gel-like molding;

[0048] 3) Put the gel-like molding in an oven for baking. The oven is provided with an upper temperature field and a lower temperature field. The temperature of the upper temperature field is 95°C, and the temperature of the lower temperature field is 105°C. Stretch along the length direction with a stretching ratio of 5.5 times, and then stretch again along the width direction at a stretching ratio of 14 times;

[0049] Immediately after stretching, put it in an oven with an upper temperature field temperature of 120°C and a lower temperature field temperature of 130°C for heat treatment;

[0050] After the heat treatment, place it in tetrachloromethane for dipping. The tetrachloromethane is divid...

Embodiment 3

[0053] 1) Get 15 mass parts of polyethylene and add 85 mass parts of white oil to prepare a mixed solution;

[0054] 2) Melt and knead the mixed solution at a temperature of 160°C, extrude it into a sheet, cast it on a cooled metal roll, and solidify to obtain a gel-like molding;

[0055] 3) Put the gel-like molding in an oven for baking. The oven is provided with an upper temperature field and a lower temperature field. The temperature of the upper temperature field is 97°C, and the temperature of the lower temperature field is 107°C. Stretch along the length direction with a stretching ratio of 5.5 times, and then stretch again along the width direction at a stretching ratio of 14 times;

[0056] Immediately after stretching, put it in an oven with an upper temperature field temperature of 130°C and a lower temperature field temperature of 140°C for heat treatment;

[0057] After the heat treatment, place it in tetrachloromethane for dipping. The tetrachloromethane is divid...

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Abstract

The invention discloses a water filtering diaphragm with an asymmetric pore structure and a preparation process thereof. The diaphragm sequentially comprises a small-pore-diameter layer, a medium-pore-diameter layer and a large-pore-diameter layer from bottom to top, wherein the average pore diameters of the small-pore-diameter layer, the medium-pore-diameter layer and the large-pore-diameter layer are in gradient distribution. Through the preparation process of the diaphragm, gradient crystals can be formed in the thickness direction of a polyolefin film before the polyolefin film is stretched, and after the polyolefin film is stretched, due to different crystallinity distribution in the thickness direction, pore diameters of different sizes can be formed in the thickness direction of thepolyolefin film; the prepared porous diaphragm sequentially comprises the small-pore-diameter layer, the medium-pore-diameter layer and the large-pore-diameter layer from top to bottom, and the porediameters are distributed in a gradient manner, so the porous diaphragm has low thickness and high filtering effect; and required raw materials and equipment are simple, cost performance is high, andthe porous diaphragm is suitable for wide popularization and application.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a water filtration diaphragm with an asymmetric pore structure and a preparation process thereof. Background technique [0002] We call the operation of improving water quality and reaching a certain water quality standard water treatment, and water treatment methods include physical treatment and chemical treatment. Among them, physical methods generally use various filter materials to exclude impurities in water by means of adsorption or barrier, and activated carbon adsorption or filter membrane barrier is often used. Traditional water filtration membranes need to be combined with membranes of different pore sizes. Conventional membranes are generally composed of three layers, which are non-woven fabric layer, polysulfone layer, and polyimide layer. Although this filter membrane has a good filtering effect, However, this kind of water filtration membrane not only has ...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D69/02B01D67/00B01D71/02
CPCB01D71/26B01D69/02B01D67/0079B01D71/024B01D2325/46B01D2325/02Y02A20/131
Inventor 王成豪李正林翁星星沈亚定盛夏
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD