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Multiplexed PVDF filter membrane and its preparation process

A preparation process, PVDF20 technology, applied in the field of multiple-use PVDF membrane and its preparation, can solve the problems of reducing the life of the ultrafiltration membrane, small flow channel contrast, waste of water resources, etc., to ensure drinking water safety, simple and reasonable formula, The effect of reducing water consumption

Active Publication Date: 2018-01-23
CHANGZHOU MEIXIAN MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The flow channel ratio of ordinary PVDF ultrafiltration membrane is relatively small, which makes it easy to attach dirt to the flow channel, which will shorten the life of the ultrafiltration membrane. Regular backwashing of the PVDF ultrafiltration membrane is required to remove the dirt attached to the membrane surface , the backwashing process is complicated and the cleaning effect is not good; or do a good job in water pretreatment to filter out large particles of inorganic matter, colloids and suspended solids
[0005] In addition, in the process of PVDF film preparation, a large number of toxic co-solvents are commonly used, and these co-solvents will remain in the film and pollute the environment
Simultaneously, also need to use a large amount of water during preparation, waste water resource

Method used

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  • Multiplexed PVDF filter membrane and its preparation process
  • Multiplexed PVDF filter membrane and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add 5% by weight of glycerin and 37% by weight of DMAC into a container at 50°C, raise the temperature to 90°C, and stir at a constant temperature for 2 hours; add 26.5% by weight of PEG600 into the above system, and stir at a constant temperature of 90°C for 2 hours Add 5% water by weight to the above system, and stir at 90°C for 2 hours; add 1.5% by weight of polyvinylpyrrolidone K90 to the above system, and stir at 90°C for 2h; add 5% by weight of polyvinylpyrrolidone K30 Adding to the above system, stirring at a constant temperature of 90°C for 2 hours; adding 20% ​​by weight of PVDF into the above system, stirring at a constant temperature of 90°C for 38 hours, to obtain a spinning solution.

[0031] (2) Send the spinning solution to the airtight container of the forming spinneret, pass gas into the container, and the spinning solution is horizontally arranged on the distribution pipe outside the container, and the distribution pipe flows from 0.01 to 4ml / min. ...

Embodiment 2

[0035] (1) Add 6% by weight of glycerin and 33% by weight of DMAC into a container at 50°C, raise the temperature to 90°C, and stir at a constant temperature for 2 hours; add 25% by weight of PEG600 into the above system, and stir at a constant temperature of 90°C for 3 hours Add 6% by weight of water to the above system, and stir at 90°C for 2 hours; add 2% by weight of polyvinylpyrrolidone K90 into the above system, and stir at 90°C for 3 hours; add 6% by weight of polyvinylpyrrolidone K30 Adding to the above system, stirring at a constant temperature of 90°C for 2 hours; adding 22% by weight of PVDF into the above system, stirring at a constant temperature of 90°C for 36 hours, to obtain a spinning solution.

[0036] (2) Send the spinning solution to the airtight container of the forming spinneret, pass gas into the container, and the spinning solution is horizontally arranged on the distribution pipe outside the container, and the distribution pipe flows from 0.01 to 4ml / mi...

Embodiment 3

[0040] (1) Add 6% by weight of glycerin and 35% by weight of DMAC into a container at 50°C, raise the temperature to 90°C, and stir at a constant temperature for 2 hours; add 25% by weight of PEG600 into the above system, and stir at a constant temperature of 90°C for 3 hours Add 5% water by weight to the above system, stir at 90°C for 3 hours; add 2% by weight polyvinylpyrrolidone K90 to the above system, stir at 90°C for 2h; add 6% by weight of polyvinylpyrrolidone K30 Adding to the above system, stirring at a constant temperature of 90°C for 2 hours; adding 21% by weight of PVDF into the above system, stirring at a constant temperature of 90°C for 36 hours, to obtain a spinning solution.

[0041] (2) Send the spinning solution to the airtight container of the forming spinneret, pass gas into the container, and the spinning solution is horizontally arranged on the distribution pipe outside the container, and the distribution pipe flows from 0.01 to 4ml / min. The outer holes o...

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Abstract

The invention relates to a multiple-use PVDF filter membrane. The raw materials include PVDF, PEG600, polyvinylpyrrolidone K30, polyvinylpyrrolidone K90, water, glycerin and DMAC. It also relates to the preparation method of the filter membrane, which includes sequentially adding raw materials into the container and stirring at a constant temperature to obtain a spinning solution; transporting the spinning solution to a spinning device, and extruding fibers through a spinneret to obtain a raw material. Membrane; the initial film passes through the phase separation tank, the condensation tank and the pore-forming water bath in sequence to obtain the pore-forming film; the pore-forming film is rolled up, steamed and formed into a film. The beneficial effects of the present invention are: the formula is simple and reasonable, the consumption of DMAC can be reduced, and it is environmentally friendly; the design of mixing and adding water can promote the adjustment of cloud point during the separation of rich and poor phases; , save electricity; the filter membrane made can be reused, easy to operate, and reduce costs; the process and materials are safe and non-toxic to the human body, and can be used with confidence; the micropore precision has a good effect on the removal of harmful microorganisms in the water body, ensuring the safety of drinking water.

Description

technical field [0001] The invention relates to a multiple-use PVDF filter membrane and a preparation process thereof. Background technique [0002] PVDF hollow fiber ultrafiltration membrane has its own advantages and characteristics. The main performance is that no support is required, the packing density in the membrane module is large, and the membrane area per unit volume is large. Therefore, it is widely used in many fields such as biotechnology, gas separation, large-scale industry and medicine. Widely used, it is generally used to remove impurities such as colloids, suspended solids, bacteria and sediment in water. [0003] In fact, most of the ultrafiltration membranes in our daily water purification industry have adopted PVDF ultrafiltration membrane modules. When the flow filter is working to make water, open the sewage valve to discharge 5-10% of the sewage. [0004] The flow channel ratio of ordinary PVDF ultrafiltration membrane is relatively small, which mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00
Inventor 张亚琴郭建刚
Owner CHANGZHOU MEIXIAN MEMBRANE TECH CO LTD