Polyperfluorinated ethylene propylene hollow fiber membrane preparation formula and preparation method

A polyperfluoroethylene propylene, fiber membrane technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve problems hindering the coordinated development of economy, policy and environment, poor acid and alkali resistance and corrosion resistance of membrane, water resources Shortage and other problems, to achieve the effect of improving melt flow properties, not easy to agglomerate, and avoiding shrinkage

Inactive Publication Date: 2019-02-19
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] From the end of the 20th century to the beginning of the 21st century, many resource-intensive industries developed rapidly, bringing about population growth and an overall improvement in the quality of life. However, environmental problems have become increasingly prominent in recent years, such as smog locking the city, water shortages, marine pollution, and oil spills. and other issues have become prominent, seriously hindering the all-round integrated and coordinated development of economy, policy and environment
[0005] The document with the application number 201010191837.0 discloses a polypropylene hollow fiber microporous membrane and its preparation method. The prepared microporous membrane has high strength and uniform pore size distribution, but 50-80% of the diluent is used, which is harmful to the environment. More serious, and the production cost is higher
The document with application number 201310507300.4 discloses a method for preparing polyacrylonitrile hollow fiber membranes. Melt spinning is used to prepare PAN-based hollow fiber membranes, which effectively avoids the use of a large number of toxic chemical reagents and effectively improves the membrane strength. However, the obtained membranes are resistant to acid Alkaline and corrosion resistance is poor

Method used

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  • Polyperfluorinated ethylene propylene hollow fiber membrane preparation formula and preparation method
  • Polyperfluorinated ethylene propylene hollow fiber membrane preparation formula and preparation method
  • Polyperfluorinated ethylene propylene hollow fiber membrane preparation formula and preparation method

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preparation example Construction

[0026] The present invention also provides a method for preparing polyperfluoroethylene propylene hollow fiber membrane (method for short), which is characterized in that the method includes the following steps:

[0027] Step 1. After the formula is uniformly mixed by a high-speed mixer, it is extruded and pelletized by a twin-screw extruder to obtain uniformly mixed particles, and the particles are automatically fed into the twin-screw extruder through a feeding hopper at 260 ~ It is extruded quantitatively through the hollow spinneret module at 380°C. Inert gas (nitrogen in this example) is introduced into the module. After the spinning melt is solidified in an air bath, it is then drawn through a hot roller at 100-150°C and then drawn online. Stretching and winding, the on-line stretching ratio is 1 to 2 times to obtain the nascent hollow fiber membrane;

[0028] Specifically: the spinning melt enters the first winding after passing through the 20-250mm air layer, after curing i...

Embodiment 1

[0033] Combine 55wt% of polyperfluoroethylene propylene (FEP) powder, 12wt% of dioctyl phthalate (DOP), 33wt% of calcium carbonate (CaCO 3 ) Use a high-speed mixer to mix evenly, feed the above blend into a twin-screw extruder, extrude and granulate to obtain uniformly mixed particles, and automatically feed into the twin-screw extruder through a feeding hopper at 305℃ It is extruded quantitatively through the hollow spinneret module, and the inside of the module is filled with nitrogen. After the spinning melt is solidified in the air bath, it is then stretched and wound on-line after passing through a 140°C hot roller. The on-line stretching ratio is 1 times. Newborn hollow fiber membrane;

[0034] The nascent hollow fiber membrane was post-stretched and heat-set in a 140℃ hot oven stretcher at a stretching rate of 1mm / min, a stretching ratio of 0.4, and a fixed length heat-setting for 30 minutes, and then the filament was immersed in 10wt% hydrochloric acid Treated in an aqueo...

Embodiment 2

[0036] Combine 55wt% of polyperfluoroethylene propylene (FEP) powder, 12wt% of dioctyl phthalate (DOP), 33wt% of calcium carbonate (CaCO 3 ) Use a high-speed mixer to mix evenly, feed the above blend into a twin-screw extruder, extrude and granulate to obtain uniformly mixed particles, and automatically feed into the twin-screw extruder through a feeding hopper at 310°C It is extruded quantitatively through the hollow spinneret module, and the inside of the module is filled with nitrogen. After the spinning melt is solidified in the air bath, it is then stretched and wound on-line after passing through a 140°C hot roller. The on-line stretching ratio is 1 times. Newborn hollow fiber membrane;

[0037] The nascent hollow fiber membrane is post-stretched, and the post-stretching heat setting is carried out in a 140℃ hot oven stretcher, the drawing rate is 2mm / min, the drawing ratio is 0.2, the fixed length heat setting is 30min, and then the film filament is immersed In 10wt% hydro...

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Abstract

The invention discloses a polyperfluorinated ethylene propylene hollow fiber membrane preparation formula and preparation method. The formula comprises 50-75wt% of polyperfluorinated ethylene propylene, 20-40wt% of a pore-forming agent, 5-15wt% of a plasticizer and 0-10wt% of auxiliary additives, wherein the sum of the components is 100wt%, and the pore-forming agent refers to calcium carbonate. The method includes: well mixing the components in the formula, granulating, quantitatively extruding particles, and after curing of spinning melt in an air bath, performing online stretching and winding to obtain a primary hollow fiber membrane; subjecting the primary hollow fiber membrane to after stretching and heat setting, and soaking membrane fibers into acid solution to leach out calcium carbonate; sequentially performing extraction washing and water washing to obtain a polyperfluorinated ethylene propylene hollow fiber membrane in a multi-hole structure with a stretching hole, a dissolution hole and an interface hole. By adoption of calcium carbonate as the pore-forming agent in the formula, decomposition in a high-temperature spinning process is avoided, and the calcium carbonate can be completely leached out by the acid solution after spinning forming is finished.

Description

Technical field [0001] The invention relates to the technical field of membranes, in particular to a membrane preparation formula and preparation method of polyperfluoroethylene propylene hollow fiber membranes. Background technique [0002] From the end of the 20th century to the beginning of the 21st century, many resource-intensive industries developed rapidly, which brought about population growth and overall improvement of the quality of life. However, environmental problems have become increasingly prominent in recent years, such as smog blocking cities, water shortages, marine pollution, and oil spills. Issues such as these have become prominent and have seriously hindered the coordinated development of all-round integration of economy, policy and environment. In recent years, as a new high and new technology, membrane technology has become one of the common technologies to solve major issues such as water resources, energy, and the environment. It plays an important role ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D69/08B01D67/00
CPCB01D67/0002B01D69/08B01D71/32B01D2325/24B01D2325/30
Inventor 肖长发黄岩刘海亮王纯黄庆林
Owner TIANJIN POLYTECHNIC UNIV
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