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Preparation method and preparation system of enhanced hollow fiber micro-filtration membrane

A preparation system and enhanced technology are applied in the field of preparation of polymer hollow fiber membranes, which can solve the problems of high production cost, unsatisfactory processing effect, complicated processing, etc., achieve less labor input, save adjustment and cleaning work, Guaranteed uniformity

Pending Publication Date: 2018-05-01
深圳市君脉膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of high production cost, complicated processing and unsatisfactory processing effect in the prior art, the present invention proposes a preparation method and a preparation system of an enhanced hollow fiber microfiltration membrane with simple equipment and stable and reliable operation, so as to reduce the production process. cost, improve product market competitiveness

Method used

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  • Preparation method and preparation system of enhanced hollow fiber micro-filtration membrane
  • Preparation method and preparation system of enhanced hollow fiber micro-filtration membrane

Examples

Experimental program
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Effect test

preparation example Construction

[0025] A simple and stable method for preparing a reinforced hollow fiber composite microfiltration membrane provided by the present invention, the steps are as follows (please combine figure 1 , 2 ):

[0026] Step 1: Pre-processing

[0027] Contaminants and moisture on the surface of the braided tubing are removed first. The specific treatment method can be selected according to the situation, such as pulling the braided pipe to the pre-treatment facility 2, cleaning the rinsing tank, and then drying with hot air. It is also possible to modify the surface properties of the braided tube first, such as plasma treatment, so that the surface has new functional groups to obtain special properties.

[0028] Step 2: Dip Coating

[0029] Pull the braided tube that removes pollutants and moisture into the casting solution tank of the coating device 3 filled with protective gas, dip it in the casting solution, and then pull the braided tube impregnated with the casting solution ver...

Embodiment 1

[0036] Embodiment 1: Preparation of polyvinylidene fluoride (PVDF) film

[0037] The ratio of casting liquid is PVDF 16wt%, PEG400 5wt%, PVP30K 4wt%, Tween 2wt%, pure water 0.5wt%, DMAc72.5wt%. Pour the above-mentioned materials into the casting solution tank 4, at 70°C, stir evenly for defoaming, then inject nitrogen gas to pressurize to 2 atm, and send the casting solution into the casting solution tank 3 for use.

[0038] Select a polyester low-elastic yarn braided tube 9 with an outer diameter of 2.0 mm, and send it to the pre-treatment device 2 after being pulled by the unwinding device 1, and dried at 60°C for 0.5 minutes, and then pulled and sent to the casting solution tank 3 for casting. The temperature in the membrane liquid tank 3 is 70° C., so that the braided pipe 9 passes through the conduction wheel immersed in the casting liquid 12 cm below the liquid surface. The braided pipe 9 coated with the casting solution enters the steam bath 7 after passing through the...

Embodiment 2

[0040] Embodiment 2: Preparation of polysulfone PS membrane

[0041] The ratio of casting solution is: PS 18wt%, PEG400 4wt%, PVP30K 6wt%, pure water 1.5wt%, DMAc 70.5wt%. The temperature of the casting bath was set at 60°C. Other processing parameters are identical with embodiment 1.

[0042] Performance test: After testing, the pure water flux of the obtained enhanced hollow fiber microfiltration membrane is 1158L / m2h (0.1MPa, 25°C), the bubble point of the membrane filament is greater than 0.25MPa, and the burst strength is greater than 0.60MPa. The enhanced PS obtained in the present invention The combination strength of microfiltration membrane and braided tube is high.

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Abstract

The invention discloses a preparation method and a preparation system of an enhanced hollow fiber micro-filtration membrane. The preparation method comprises the following steps: firstly, removing pollutants and moisture on the surface of a braided tube; towing the braided tube into a casting membrane solution for impregnation, and then towing the braided tube impregnated with the casting membranesolution vertically upwards; introducing the braided tube coated with the casting membrane solution into a steam bath, splitting phases of a membrane surface of the braided tube to form a micro-porous membrane, and introducing the micro-porous membrane into a coagulating bath for further solidification to form an enhanced hollow fiber micro-filtration membrane; and rinsing the enhanced hollow fiber micro-filtration membrane in pure water for 12 to 24 hours, finally drying the membrane after soaking the membrane in a protective solution for 8 to 24 hours. The preparation method provided by theinvention can ensure the uniformity of a coating layer on the surface of the braided tube, and can quickly adjust the thickness of the coating layer and the bonding strength between the membrane andthe braided tube. The production process is stable and reliable, the production is convenient to operate and control, and the membrane wire quality will not be seriously influenced. The preparation system saves the cost of a spinneret and saves the cost; and the work of adjusting and cleaning the spinneret is omitted, the labor intensity of workers is reduced, and the labor cost is saved.

Description

technical field [0001] The invention relates to a preparation technology of a polymer hollow fiber membrane, in particular to a preparation method and a preparation system of a braided tube reinforced polymer hollow fiber microfiltration membrane. Background technique [0002] With the rapid development of the national economy and the continuous improvement of people's living standards, the requirements for the environment, especially the safety of the water environment, are getting higher and higher. In order to obtain more stable and high-quality effluent water, more and more membrane water treatment technologies are used in sewage treatment and drinking water treatment processes, among which hollow fiber ultra / microfiltration membranes are more and more widely used. Membrane bioreactor (MBR) and tap water membrane filtration have become the most promising wastewater and water treatment technologies in the market, while lining-reinforced hollow fiber composite membranes wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/68B01D71/42B01D71/30B01D69/08B01D67/00
CPCB01D67/0011B01D67/0013B01D69/08B01D71/30B01D71/34B01D71/42B01D71/68
Inventor 段伟杨瀚罗灼彪
Owner 深圳市君脉膜科技有限公司
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