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Method for preparing hydrophobic polyvinyl chloride membrane and membrane prepared by method

A polyvinyl chloride membrane and polyvinyl chloride technology, applied in the field of filter membranes, can solve the problems of many impurities in the finished membrane, and achieve the effects of simple preparation method, large pore size and high production efficiency

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

AI Technical Summary

Problems solved by technology

According to the method of the prior art, find that the preparation method of existing polyvinyl chloride ultrafiltration membrane all comprises the step that initial product film is immersed in the coagulation bath, and has added a lot of component materials in casting liquid, and this just is easy As a result, there are more impurities remaining on the final finished film, and more complicated cleaning steps are required to ensure the purity of the finished film

Method used

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  • Method for preparing hydrophobic polyvinyl chloride membrane and membrane prepared by method
  • Method for preparing hydrophobic polyvinyl chloride membrane and membrane prepared by method
  • Method for preparing hydrophobic polyvinyl chloride membrane and membrane prepared by method

Examples

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Effect test

specific Embodiment 1

[0053] Select polyvinyl chloride with a polymerization degree of about 1200, 60% tetrahydrofuran, 25% acetone and 10% ethanol with a weight ratio of 5%, mix them uniformly according to the order of S1 steps to form a casting solution, and then apply it to the non-woven fabric on the support, and then stay in the air section with an air humidity of 70% and an air temperature of about 25°C for 2 minutes, wait for it to completely separate phases, and then carry out post-processing and drying to obtain the finished roll film. The finally obtained membrane has a pore size of 5um, a porosity of 70%-90%, a water bubble pressure of 12kpa-15kpa, and a time of filtering 50ml of water under a pressure of 5kpa for 1.5s.

specific Embodiment 2

[0055] Select polyvinyl chloride, 58.5% tetrahydrofuran, 25% acetone, and 10.5% ethanol with a weight ratio of 6% of the degree of polymerization to be about 1200, and mix them uniformly according to the order of step S1 to form a casting solution, and then apply it to no Spin cloth support, and then stay in the air section with an air humidity of 70% and an air temperature of about 25°C for 2 minutes, wait for complete phase separation, and then carry out post-processing and drying to obtain the finished roll film. The finally obtained membrane has a pore size of 0.8um, a porosity of 70%-90%, a water bubble pressure of 90kpa-120kpa, and a time of 20s for filtering 50ml of water under a pressure of 5kpa.

specific Embodiment 3

[0057] Select polyvinyl chloride with a degree of polymerization of about 1800, 60% tetrahydrofuran, 25% acetone and 10% ethanol with a weight ratio of 5%, mix them uniformly according to the order of S1 steps to form a casting solution, and then apply it to the non-woven fabric on the support, and then stay in the air section with an air humidity of 70% and an air temperature of about 25°C for 2 minutes, wait for it to completely separate phases, and then carry out post-processing and drying to obtain the finished roll film. The finally obtained membrane has a pore size of 1um, a porosity of 70%-90%, a water bubble pressure of 60kpa-80kpa, and a pressure of 5kpa to filter 50ml of water for 10s.

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Abstract

The invention relates to a method for preparing a hydrophobic polyvinyl chloride membrane, which comprises the following steps: S1, preparing a membrane casting solution which comprises the followingcomponents in percentage by weight: 3%-10% of polyvinyl chloride, 40%-90% of a solvent, 0%-30% of a co-solvent and 0%-50% of a pore-foaming agent; wherein the preparation process comprises the following steps: uniformly mixing the solvent and the co-solvent, adding the polyvinyl chloride, and adding the pore-foaming agent after the polyvinyl chloride is completely dissolved; S2, forming a primaryfinished product membrane; S3, placing the primary finished product membrane in the step S2 in an air section for phase splitting; S4, cleaning with clear water until the residual solvent of the membrane is less than 20mg / m < 2 >; S5, drying: drying the cleaned membrane at the temperature of 60-100 DEG C until the water content is less than 0.5 wt%; the invention aims to provide the preparation method of the hydrophobic polyvinyl chloride membrane and the hydrophobic polyvinyl chloride membrane with larger pore diameter, which have the advantages of simpler steps, fewer impurities and higher production efficiency compared with the prior art.

Description

technical field [0001] The invention relates to a filter membrane, in particular to a method for preparing a hydrophobic polyvinyl chloride membrane and the 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 air filtration and other industries, due to the largest demand and no special requirements for membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/06B01D69/08B01D71/30
CPCB01D71/30B01D69/02B01D69/08B01D67/0002B01D69/06B01D2325/38
Inventor 贾建东朱杭城陈锋
Owner HANGZHOU COBETTER FILTRATION EQUIP