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

A polyvinyl chloride and microporous membrane technology, which is applied in the field of membrane separation, can solve the problems of not finding amorphous PVC microporous membrane, difficult to control membrane structure and performance, shortening the service life of membrane, etc. , The effect of improving mechanical properties and reducing pollutant emissions

Active Publication Date: 2008-06-11
HAINAN LITREE PURIFYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 i

Method used

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

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preparation example Construction

[0032] The preparation process of the membrane in the invention consists of three steps: preparation of membrane material, molding of precursor hollow fiber membrane and extraction to form pores. The preparation of the membrane-making material is to mix polyvinyl chloride, diluent, toughener and heat stabilizer, and then melt and blend to form a uniform membrane-making material; the forming of the hollow fiber membrane is to pass the molten membrane-making material through the hollow fiber molding process , using water or diluent as a cooling bath to solidify into a precursor hollow fiber membrane (see figure 1 ); the extraction is to extract the diluent in the precursor hollow fiber membrane with an organic solvent, and convert the precursor hollow fiber membrane with a dense structure into a hollow fiber microporous membrane. The three steps can be continuous or intermittent.

[0033] The composition of polyvinyl chloride hollow fiber microporous membrane among the present ...

Embodiment 1

[0046] (1) Preparation of film-making materials: polyvinyl chloride (polymerization degree of 3600), diphenyl ether, dibutyl phthalate, and di-n-octyl tin dilaurate in a ratio of 15:79:5:1 Add it into the melting material kettle, heat the material to 140°C under stirring and nitrogen protection, melt and form a uniform film-making material for 1 hour, and then let it stand for defoaming.

[0047] (2) Precursor hollow fiber membrane forming: using diphenyl ether as the core liquid, extruding the melt of the film-making material through the spinneret under a certain pressure to form a tubular liquid film, the liquid film enters the water after passing through an air gap. Solidified into a precursor hollow fiber membrane in a cooling bath;

[0048] (3) Extraction to form pores: soak the precursor hollow fiber membrane in ethanol extractant at 20° C. for 24 hours, take it out and dry it in the air to obtain the polyvinyl chloride hollow fiber microporous membrane.

[0049] The va...

Embodiment 2

[0053] The preparation steps are the same as in Example 1, and the various implementation conditions and the structure and performance of the obtained polyvinyl chloride hollow fiber microporous membrane are shown in Table 2.

[0054] Table 2

[0055]

[0056]

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/30B01D67/00
Inventor 张春芳朱宝库陈良刚
Owner HAINAN LITREE PURIFYING TECH CO LTD
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