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Hollow fiber porous membrane in perfluoro polymer and preparation method thereof

A perfluoropolymer and porous membrane technology, which is applied in chemical instruments and methods, membrane technology, and semipermeable membrane separation, can solve the problems of high cost and limited large-scale industrial production of perfluoropolymer hollow fiber membranes, etc. Achieve the effects of energy saving, viscosity reduction, and controllable membrane pore size

Inactive Publication Date: 2010-11-17
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost price of the above method is too high, which limits the large-scale industrial production of perfluoropolymer hollow fiber membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Polyperfluoroethylene propylene with a hexafluoropropylene content of 18% is used as the polymer matrix phase; PVDF is used as the polymer additive; the composite porogen is 0.01 μm SiO 2 A mixture of powder and PEO, the former is an insoluble porogen, accounting for 30% of the total composite porogen, and the latter is a soluble porogen, accounting for 70% of the total composite porogen; organic low molecular liquid Choose DBP. The distribution ratio of each component in the multi-phase film-forming system is as follows:

[0032] Perfluoropolymer 40

[0033] Polymer Additives (PVDF) 10

[0034] Composite porogen 40

[0035] Organic low molecular liquid (DBP) 10,

[0036] The PVDF, composite porogen, and organic low-molecular liquid are forced to mix uniformly through a mixing tank to obtain a viscous mixture, and then mixed with granular perfluoropolymer resin, then fed into a twin-screw extruder, and passed through a self-made hollow The fiber spinneret assembly ...

Embodiment 2

[0038] In Example 1, the insoluble porogen SiO 2 The proportioning of the porogen is adjusted to 10% of the total amount of the porogen, the proportioning of the soluble porogen PEO is adjusted to 90%, and other conditions remain unchanged, and three kinds of hollow membranes are obtained. Correspondingly recorded as 4#, 5# and 6# film.

Embodiment 3

[0040] Polyperfluoroethylene propylene with a hexafluoropropylene content of 18% is used as the polymer matrix phase; PCTFE is used as the polymer additive; the composite porogen is 0.01 SiO 2 Powder, 5μm CaCO 3 A mixture of powder and PEO, the former two are insoluble porogens, the mass ratio of the two is 1 / 1, accounting for 30% of the total composite porogen, and the latter is a soluble porogen, accounting for 30% of the total composite porogen 70% of the total amount of the agent; DOP is selected as the organic low molecular liquid. The distribution ratio of each component in the film-forming system is as follows:

[0041] Perfluoropolymer 60

[0042] Polymer Additives (PCTFE) 10

[0043] Composite porogen 20

[0044] Organic low molecular liquid (DOP) 10,

[0045] PCTFE, composite porogen and organic low-molecular liquid are forced to mix uniformly through a mixing tank to obtain a viscous mixture, and then mixed with granular perfluoropolymer resin, then fed into a ...

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Abstract

The invention discloses a hollow fiber porous membrane in a perfluoro polymer and a preparation method thereof. A membrane forming system of the membrane comprises the following components in percentage by weight: 40 to 60 percent of perfluoro polymer; 10 to 30 percent of polymer additive, 10 to 30 percent of composite pore-forming agent and 5 to 20 percent of organic low-molecular liquid; the perfluoro polymer is a copolymerized modified product of tetrafluoroethylene and a perfluoro second monomer; the polymer additive is fluor alkaline-containing polymers or a mixture thereof; the composite pore-forming agent comprises a soluble pore-forming agent and a non-soluble pore-forming agent; and the organic low-molecular liquid is a diluent of the polymer additive with a high boiling point. The preparation method comprises the following steps of: forcibly mixing the polymer additive, the composite pore-forming agent and the organic low-molecular liquid; uniformly mixing the mixture and the perfluoro polymer particles; and injecting the mixture into a double-screw machine, performing melt blended spinning at a temperature of between 300 and 360 DEG C and finally performing a conventional post-processing to obtain the hollow fiber porous membrane.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a perfluoropolymer hollow fiber porous membrane and a preparation method thereof. Background technique [0002] The perfluoropolymer material whose main chain is composed of carbon and fluorine not only has the excellent properties of polytetrafluoroethylene (PTFE), such as corrosion resistance, heat resistance, non-stickiness, low coefficient of friction, and atmospheric aging resistance, but also It can be processed by conventional melting process, so it is used as special filter fiber, pipe lining, optical cable sheath, etc., and has been widely used in many fields such as chemical industry, machinery, electrical appliances, etc. [0003] The outstanding chemical stability and excellent high and low temperature performance of perfluoropolymers have attracted increasing attention from membrane researchers, especially their good corrosion resistance, making them widely used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D67/00B01D69/08
Inventor 肖长发黄庆林胡晓宇安树林
Owner TIANJIN POLYTECHNIC UNIV
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