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Method for preparing braided tube reinforced polyvinylidene fluoride porous membrane

A technology of polyvinylidene fluoride and braided tubes, which is applied in the field of separation membrane manufacturing, can solve the problems that the membrane separation layer is easy to fall off, and achieve the effects of not easy to fall off, long life, and easy large-scale production

Inactive Publication Date: 2012-06-27
北京坎普尔环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention relates to a method for preparing a structurally stable braided tube-reinforced polyvinylidene fluoride porous membrane, which mainly solves the problem that the braided tube-reinforced PVDF membrane separation layer is easy to fall off in the known technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Put PVDF powder (kynar761, Mw=375,000), PEG400, DMAc, triethyl phosphate (30%, 15%, 35% and 20% by weight) together into a specially designed dissolving tank It is protected by nitrogen gas, heated to 150°C, stirred to dissolve it into a homogeneous solution, then stirred for more than 3 hours, then stop stirring, and keep it at 150°C for more than 6 hours. After defoaming, preheat the intubation spinneret and keep it at 150°C, continuously pass the braided tube through the central intubation of the spinneret, and then increase the nitrogen pressure to extrude the membrane-forming liquid from the spinneret. After walking for a short distance in the air (≤10cm), immediately drop the braided tube coated with polyvinylidene fluoride membrane liquid into the cold quenching liquid composed of a mixture of polyethylene glycol 200 and DMAc 1:1 In this case, the chilled liquid has been previously cooled to below 10°C with a refrigerator. After passing a distance of a...

example 2

[0036] Example 2: Adjust the composition of the membrane-making solution to PVDF powder (Sanaifu 904, Mw=600,000), PEG400, DMAc, and triethyl phosphate in weight percentages of 15.5%, 12.5%, 40% and 30% , The spinning temperature is 135℃, and the other conditions are the same as in Example 1.

[0037] It is measured that the inner diameter of the PVDF hollow fiber membrane is 0.9mm, the outer diameter is 1.80mm, the bubble point pressure is 0.16MPa, and the flux to 25℃ pure water at 0.02MPa pressure is 512L / m 2 ·H.

example 3

[0038] Example 3: Except that the cold quenching solution is 10% water + 45% PEG200 and 45% DMAc, the rest are the same as in Example 1.

[0039] The measured PVDF hollow fiber membrane has an inner diameter of 0.9mm, an outer diameter of 1.85mm, a bubble point pressure of 0.28MPa, and a flux of 62L / m to pure water at 25°C under a pressure of 0.02MPa. 2 ·H.

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Abstract

The invention belongs to the membrane separation manufacturing field, and relates to a method for preparing polyvinylidene fluoride braided tube reinforced hollow fiber or capillary tube porous membrane (including a microfiltration membrane and a ultrafiltration membrane) by a composite thermal induced phase separation method (C-TIPS method), and the prepared porous membrane can be used in the fields such as environmental protection, water purification, sewage treatment and the like. The method is characterized in that dissolving polymer with weight percentage concentration of 10-45% and water-soluble composite diluent in a reaction kettle at the temperature of 110-170 DEG C, and making the dissolved solution into membrane-making liquid; then, squeezing the membrane-making liquid into composite cold quenching liquid with the temperature of 4-15 DEG C together with a braided tube (used for replacing inner core liquid) by a universal membrane-making mould within the temperature range of 110-170 DEG C, carrying out the composite phase separation process, and obtaining the braided tube reinforced capillary tube ultrafiltration membrane or microfiltration membrane through a series of post-processing. The mechanical strength of a coating layer coated by the C-TIPS method in the method is obviously higher than that coated by a neural information processing system (NIPS) method, so that the membrane does not easily fall off, is longer in service life and can be treated by backflushing through higher pressure; the temperature of coating liquid in the C-TIPS method is lower than the decomposition temperature of polyvinylidene fluoride, so that the problem that hydrogen fluoride is corroded can be prevented; and due to the reinforcing function of the braided tube, the capillary tube membrane is more durable in use.

Description

Technical field [0001] The invention belongs to the field of separation membrane manufacturing, and relates to a method for preparing polyvinylidene fluoride braided tube reinforced hollow fibers or capillary porous membranes (including microfiltration membranes and ultrafiltration membranes) using a composite thermally induced phase separation method (c-TIPS method) . The prepared porous membrane can be used in environmental protection, water treatment and other fields. Background technique [0002] There are many preparation methods for polymer porous membranes (including microfiltration membranes and ultrafiltration membranes), among which the most common are non-solvent induced phase separation (NIPS, DIPS) method, also known as "immersion precipitation method" (IP method), pull Stretching method and thermally induced phase separation (TIPS). The polymer porous membrane has a flat plate type, a hollow fiber type, a capillary type and a tube type. Among them, the hollow fib...

Claims

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Application Information

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IPC IPC(8): B01D71/34
Inventor 孟广祯祝振鑫黄立州
Owner 北京坎普尔环保技术有限公司
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