Method for preparing hydrophilic PVC hollow fiber membrane and hydrophilic PVC hollow fiber membrane prepared by method

A fiber membrane and hydrophilic technology, applied in the field of hollow fiber membranes, can solve the problems of polyvinyl chloride instability, molecular chain breakage, affecting performance, etc., and achieve the effect of improving purity, large water flux, and high structural strength

Pending Publication Date: 2020-12-18
HANGZHOU COBETTER FILTRATION EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, polyvinyl chloride becomes a viscoelastic body at 130°C, and polyvinyl chloride itself exists in a viscous fluid state at 160°C-180°C. PVC itself is very unstable, and its molecular chains are easily broken, which affects its Performance

Method used

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  • Method for preparing hydrophilic PVC hollow fiber membrane and hydrophilic PVC hollow fiber membrane prepared by method
  • Method for preparing hydrophilic PVC hollow fiber membrane and hydrophilic PVC hollow fiber membrane prepared by method
  • Method for preparing hydrophilic PVC hollow fiber membrane and hydrophilic PVC hollow fiber membrane prepared by method

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[0024] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0025] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

[0026] A hydrophilic PVC hollow fiber membrane, the fiber monomer of which is in the shape of a long hollow tube. There are a large number of micropores with a diameter between 0.1 μm and 20 μm on t...

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Abstract

The invention relates to a method for preparing a hydrophilic PVC hollow fiber membrane, which comprises the following steps: S1, preparing a membrane casting solution, wherein mixing 8-15 wt% of polyvinyl chloride, 5-15 wt% of a hydrophilic pore-foaming agent, 5-10 wt% of a high-volatility solvent and 65-82 wt% of a conventional solvent at 25-80 DEG C, fully and uniformly stirring, defoaming, standing and cooling to room temperature; S2, carrying out solvent evaporation phase pre-splitting, wherein extruding the membrane casting solution obtained in the step S1 into a tubular liquid membranefilled with a core liquid through a spinning nozzle, and extruding the core liquid together through the spinning nozzle; S3, carrying out non-solvent induced phase inversion and curing at the same time, and immersing a liquid membrane formed in the step S2 in coagulating bath at a constant speed to be cured; S4, cleaning; and S5, rolling. the invention aims to provide the hydrophilic PVC hollow fiber membrane with an asymmetric structure, hydrophilicity, high strength, high porosity and stable structure and performance, and the preparation method of the hydrophilic PVC hollow fiber membrane.

Description

technical field [0001] The invention relates to a hollow fiber membrane, in particular to a method for preparing a hydrophilic PVC hollow fiber membrane and a hydrophilic PVC hollow fiber membrane prepared by the method. Background technique [0002] Membrane separation technology has the characteristics of simplicity, practicality, environmental protection, and high efficiency. It has been continuously developed in recent years and is widely used in the fields of electronic semiconductors, medical pharmaceuticals, food and beverage, air separation, and wastewater treatment. At present, commercialized membranes are mainly made of polyethersulfone, polysulfone, polyvinylidene fluoride, polytetrafluoroethylene, nylon and other materials. Due to their different characteristics, these materials have their own characteristics and advantages, and the fields of application are naturally different. Among them, in the wastewater treatment industry, due to the largest demand and no s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/08B01D71/30
CPCB01D71/30B01D69/02B01D69/08B01D67/0002B01D2325/36
Inventor 贾建东朱杭城陈锋
Owner HANGZHOU COBETTER FILTRATION EQUIP
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