Drying method for microporous film

A drying method and microporous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of sealing a large number of air bubbles, inability to completely dry microporous membranes, failure, etc.

Inactive Publication Date: 2014-02-12
WUHAN AQUCELL MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The root cause is that the microporous membrane cannot be completely dried. Once polyurethane is used as a sealing material, polyurethane will react with residual moisture and generate a large number of air bubbles, resulting in sealing failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take the ultrafiltration membrane filament made of polyvinyl chloride PVC material, and test the initial water flux of 300L / ·H, 0.1Mpa, 25°C, 3kg without any bubble point. Dry the medium with carbon dioxide as the supercritical fluid, cut 100 pieces with a length of 1.0m, and the test weight is 60.0g; wet the dried membrane silk with an aqueous solution of isopropanol and test it, the water flux is 300L / ·H, 0.1MPa, 25℃, 3kg without any bubble point.

Embodiment 2

[0025] Take the ultrafiltration membrane filament made of polyethersulfone resin PES, dry it with carbon dioxide as the supercritical fluid medium, and cast it into a component with a diameter of 90mm with A50 hardness two-component polyurethane. After 100,000 impact tests, no membrane filaments were broken.

Embodiment 3

[0031] The microfiltration membrane filament made of polyvinylidene fluoride PVDF is taken, dried with ethanol as the medium of supercritical fluid, and cast into a component with a diameter of 90 mm with A50 hardness two-component polyurethane. The color of the end face is clean, and the 3kg gas test is pressure-proof and air-tight.

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PUM

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Abstract

The invention relates to a drying method for a microporous film. The drying method mainly comprises two steps, namely a preliminary dehydrating step and a drying step. The drying method is characterized in that the microporous film is dried according to a supercritical fluid drying method in the drying step. The supercritical fluid in the supercritical fluid drying method is carbon dioxide, methyl alcohol, ethanol, propyl alcohol, isopropyl alcohol, butanol, isobutyl alcohol or tertiary butanol. According to the invention, the microporous film is preliminarily dehydrated first, and is then dried with the fluid in the supercritical state. The film dried through the method is a dry film hardly containing moisture, the microstructure of the microporous film is integrally kept, and the initial property of the microporous film can be completely recovered when used.

Description

technical field [0001] The invention relates to a drying method of a microporous membrane. Background technique [0002] Since the 1950s, membrane separation technology has gradually been commercialized, and microporous membranes of various micropore sizes, various forms, and various uses have emerged continuously. As an advanced technology, membrane separation has an increasing impact on separation, purification, and environmental protection. Countries have invested a lot of manpower and funds in the research and development of membranes. At the same time, other links in the industrialization chain, such as long-term stable storage of membrane modules, anti-damage of membrane modules, sealing and bonding of membrane modules and other technologies, have not changed much in the past half a century and are weak links. The shortcomings of these corresponding technologies prevent the investment in research and development of the membrane itself from being fully reflected. For ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00
Inventor 陈泉学郝艳杰庞兵
Owner WUHAN AQUCELL MEMBRANE TECH
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