Method for preparing internal support polyvinylidene fluoride hollow fiber membrane

A technology of polyvinylidene fluoride and fiber membrane, which is applied in chemical instruments and methods, membrane technology, and semipermeable membrane separation, etc. The resin process is not easy to operate and other problems, to reduce the possibility of broken wires and fouling, the performance and coating process requirements are not high, and the effect of avoiding the influence of timeliness

Active Publication Date: 2014-05-14
盐城海普润科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adhesive resin process used is not easy to operate, and it is easy to block the pores of the hollow braided rope, which affects the flux of the inner support hollow fiber membrane. Heat treatment of the hollow braided rope can easily change the surface morphology of the braided rope and affect the relationship between the rope and the cortical membrane material. bonding effect

Method used

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  • Method for preparing internal support polyvinylidene fluoride hollow fiber membrane
  • Method for preparing internal support polyvinylidene fluoride hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) 17.5g of polyvinylidene fluoride resin with a weight average molecular weight of 600,000, 1g of polyvinylpyrrolidone (K90), 0.5g of anhydrous lithium chloride, and 31g of dimethylformamide are uniformly mixed at 90°C, Stirring, dissolving, filtering and defoaming to obtain a polyvinylidene fluoride casting solution with a mass concentration of 35%;

[0032] (2) The polyester hollow braided rope with an inner diameter of 0.5mm and an outer diameter of 1.2mm is soaked in a 10% sodium hydroxide aqueous solution for 0.5h at a mass concentration of 80°C, taken out, washed and dried, and the braided rope The rope is processed at a speed of 10m / min under normal pressure plasma with a nozzle diameter of 2.5cm, a nozzle height of 2mm, a frequency of 8KHz, a voltage of 16kV, a discharge gas of argon, and a gas flow rate of 10L / min;

[0033] (3) The hollow braided rope processed in step (2) and the mass concentration of 35% polyvinylidene fluoride casting solution prepared in ...

Embodiment 2

[0035] (1) 7.5g of polyvinylidene fluoride resin with a weight average molecular weight of 400,000, 4g of polyvinylpyrrolidone (K12), 1.5g of ammonium chloride, and 37g of dimethylacetamide are uniformly mixed and stirred at 30°C, Dissolving, filtering and defoaming to obtain a polyvinylidene fluoride casting solution with a mass concentration of 15%;

[0036] (2) The polyethylene hollow braided rope with an inner diameter of 2.2mm and an outer diameter of 3.2mm is soaked in an aqueous solution of 10% sodium hydroxide for 1 hour at a temperature of 30°C, and then washed and dried in water. At a speed of 4m / min, the diameter of the nozzle is 2.5cm, the height of the nozzle is 2mm, the frequency is 16KHz, the voltage is 20kV, the discharge gas is oxygen, and the gas flow rate is 1L / min.

[0037](3) The hollow braided rope processed in step (2) and the mass concentration of 15% polyvinylidene fluoride casting solution prepared in step (1) pass through the spinneret (the inner hol...

Embodiment 3

[0039] (1) 9g polyvinylidene fluoride resin with a weight average molecular weight of 700,000, 1.5g polyethylene glycol (molecular weight 200), 1g polyvinylpyrrolidone (K17), 0.5g ammonium chloride, 0.5g calcium chloride, 37.5 gN-Methylpyrrolidone was uniformly mixed, stirred, and dissolved at 50°C, and after filtering and defoaming, a polyvinylidene fluoride casting solution with a mass concentration of 18% was obtained;

[0040] (2) Soak a polyamide hollow braided rope with an inner diameter of 1.8mm and an outer diameter of 3.0mm at 60°C for 0.4h with a mass concentration of 10% sodium hydroxide aqueous solution, take it out and wash it in the air, and the braided rope The rope is processed at a speed of 2m / min in an atmospheric pressure plasma with a nozzle diameter of 2.5cm, a nozzle height of 2mm, a frequency of 20KHz, a voltage of 3kV, a discharge gas of helium, and a gas flow rate of 20L / min;

[0041] (3) The hollow braided rope processed in step (2) and the mass conce...

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Abstract

The invention relates to a method for preparing an internal support polyvinylidene fluoride hollow fiber membrane. The method comprises the following steps of: processing a hollow braided rope by using constant-pressure plasma, coating a thin layer of polyvinylidene fluoride casting membrane liquid on the outer surface of the rope, solidifying and washing to obtain the internal support polyvinylidene fluoride hollow fiber membrane. The interface wettability and hydrogen-bond bonding force between the braided rope and a cortical polyvinylidene fluoride material are improved by the hollow braided rope processed by the constant-pressure plasma; and the hollow braided rope is processed by the plasma under the atmospheric pressure, so the requirement of industrial continuous production can be met, and the surface processing of the hollow braided rope and the coating process of the casting membrane liquid can be performed continuously. By the method, the problem that a cortical layer is easy to shed in the process of using the internal support hollow fiber membrane is solved, and the prepared internal support polyvinylidene fluoride hollow fiber membrane can be used for membrane bioreactors (MBR) and immersed ultrafiltration assemblies.

Description

field of invention [0001] The invention relates to a preparation method of an internally supported polyvinylidene fluoride hollow fiber membrane. Background technique [0002] Hollow fiber membranes have many advantages such as high packing density and self-support, and are widely used in many aspects such as industrial wastewater treatment, domestic sewage reuse, and seawater desalination pretreatment. In the process of use, it has to repeatedly withstand the impact and disturbance of large flow water flow and air flow, which is very prone to fracture and damage, which affects the treatment effect and also brings adverse effects on subsequent unit operations. [0003] The strength of the hollow fiber membrane can be improved to a certain extent by optimizing the membrane material and preparation process or adding nano-oxides to the casting solution system, but there are disadvantages such as insignificant improvement effect and poor universality. In recent years, domestic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/10B01D69/08
Inventor 刘必前汪前东李兰
Owner 盐城海普润科技股份有限公司
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