Modified polyvinyl chloride hollow fiber microporous memebrane and method for providing the same

Abstract

The invention discloses a hollow microporous membrane of a modified polychloroethylene and process for preparation. The hollow microporous membrane of the modified polychloroethylene has a spongy structure, the bore diameter of a microporous is 0.01-1.0 um, the porosity rate of the membrane is 40-80%, wall thickness of the membrane is 0.10-0.30 mm, and the external diameter of the membrane is 1.0-3.0mm, wherein the main components of the hollow microporous membrane of the modified polychloroethylene are polychloroethylene and toughening agent. The preparing method is realized on the basis of thermal separation process. The hollow microporous membrane of the improved polychloroethylene which is made by the invention has the advantages of narrow bore diameter distribution, high intensity, and good structural repeatability and the like, and the bore diameter is easy to be controlled. The invention is a filter membrane material for water process which has high performance, low cost and long service life.

Description

technical field [0001] The invention relates to membrane separation technology, in particular to a polyvinyl chloride hollow fiber microporous filter membrane material and a preparation method thereof. Background technique [0002] Due to the advantages of high efficiency, simple equipment, convenient operation, energy saving and environmental protection, membrane separation technology has shown great application potential in the industrial field, and its application range has been extended to biology, medicine, environmental protection, energy, seawater desalination, wastewater treatment, etc. field. Membrane materials are the core basic materials of membrane separation technology. Among them, ultrafiltration membranes and microfiltration membranes are the most widely used microporous membrane materials. Among the two types of membrane materials, inorganic membranes (mainly ceramic membranes and metal membranes) and organic polymers, polymer membranes occupy a dominant pos...

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Problems solved by technology

In the phase inversion method reported in the Chinese patent (patent number: CN1621434A), a superhydrophobic porous polyvinyl chloride film with a surface microstructure of micron and nanoscale particles and its preparation method is reported, and the contact angle between the film and water is greater than 150° , has good superhydrophobic properties, but the membrane is not intended for water treatment

However, in the general immersion precipitation phase inversion method or its deformed microporous membrane preparation technology, there are the following problems due to the limitation of the principle: (1) There are many factors affecting the membrane structure in the membrane production process, and the phase change membrane process Involving material exchange, the structure and performance of the membrane are difficult to control; (2) The membrane production process forms a large amount of organic wastewater that is difficult to harmless and recycle, resulting in high membrane production costs and environmental pollution; (3) The internal structure of the membrane is mostly large finger-shaped holes, and the strength of the membrane is low, which is not suitable for application in water treatment projects with high hydraulic impact strength; (4) Due to the intrinsic nature of the PVC material, the PVC membrane High brittleness and poor toughness can easily cause damage to the end of the membrane module and shorten the service life of the membrane

Since the thermally induced phase separation mechanism was proposed in the early eighties of the 20th century, there have been some reports on the preparation of polymer microporous materials and flat membranes by thermally induced phase separation, such as U.S. patents (patent numbers: US3423491, US4020230, US4247498, US4490431, US4726989) and Chinese patent (Patent No.: CN1265048A) respectively reported the technology of polyethylene, polypropylene, polyvinylidene fluoride hollow fiber or flat microporous membrane prepared by thermal phase separation principle, wherein polyethylene, Polypropylene, polyvinylidene fluoride, etc. are mainly crystalline or semi-crystalline polymers, but no reports have been found on the preparation of amorphous PVC microporous membranes using the principle of thermally induced phase separation.

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