Hydrophilicity polyethylene hollow fiber micro-hole film and the preparation method

A polyethylene and hydrophilic technology, which is applied in the field of membrane separation, can solve the problems of preparing hydrophilic polyethylene hollow fiber microporous membranes by the TIPS method, and achieve outstanding pollution resistance, outstanding hydrophilic effect, and precise interception performance. Effect

Inactive Publication Date: 2007-09-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing TIPS method for preparing polyethylene microporous membrane technology, the obtained membranes are all hydrophobic membranes, and these membranes cannot meet the requirements for direct use in water treatment. So far, no TIPS method has been found to prepare hydrophilic membranes. Report on Waterborne Polyethylene Hollow Fiber Microporous Membrane

Method used

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  • Hydrophilicity polyethylene hollow fiber micro-hole film and the preparation method
  • Hydrophilicity polyethylene hollow fiber micro-hole film and the preparation method

Examples

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preparation example Construction

[0030] 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 polyethylene, polyethylene oxide-containing amphiphilic copolymer, inorganic nanoparticles and diluents, and then melt and blend them into a uniform membrane-making material; the molding of the hollow fiber membrane is: the molten state The membrane material is solidified into a precursor hollow fiber membrane through a hollow fiber molding process with water or a diluent as a cooling bath (see Figure 1); the extraction to form pores is to extract the diluent in the precursor hollow fiber membrane with an organic solvent, and the The dense structured precursor hollow fiber membranes are converted into hollow fiber microporous membranes. The three steps can be continuous or intermittent.

[0031] The molecular weight range of t...

Embodiment 1

[0047] (1) Preparation of film-making material: high-density polyethylene polyethylene (molecular weight 1.0×10 5 ), poly(ethylene-ethylene oxide) (molecular weight is 5.0×10 2 , PEO content is 20%), silica nanoparticles (50 nanometers) and diphenyl ether are melted and blended into a uniform film-making material at 170 ° C in the melting material kettle at a ratio of 30: 10: 0.5: 60, and the time is 2 hours. Then stand at 170°C for 1 hour for degassing;

[0048] (2) Forming of hollow fiber membrane: with diphenyl ether at 30°C as the core liquid, extrude the melt of the film-making material at 0.2 MPa through a spinneret at 140°C to form a tubular liquid film, and the liquid film passes through a 10 cm long Enter the water cooling bath at 20°C after entering the air gap to solidify into a precursor hollow fiber membrane;

[0049] (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 th...

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 hydrophilic polyethylene hollow fiber microporous membrane are shown in Table 2.

[0054] Cast film material

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Abstract

The invention discloses hydrophilic polyethylene hollow fiber microporous membrane and preparation process thereof. Said membrane is characterized in that it mainly comprises polyethylene, amphoteric copolymer containing polyethylene oxide, and inorganic nano particles. The membrane preparing process is carried out based on thermally induced phpase separation and surface segregation principles, comprising the steps of (1) preparing membrane blank by fusion and blending of amphoteric copolymer containing polyethylene oxide, diluent, and inorganic nano particles; (2) preparing hollow fiber membrane precursor by hollow process spinning of membrane blank in molten state; (3) extracting diluent in hollow fiber membrane precursor by using organic solvent to obtain said hydrophilic polyethylene hollow fiber microporous membrane, wherein the porosity of said membrane is between 40% and 80%, and average pore diameter is between 0.1mum and 5.0mum. The microporous membrane in the invention has the characteristics of high hydrophilicity, narrow pore size distribution, high strength, and good chemical stability, and serves as micro-filtration and ultra-filtration membrane material with high performance, low cost, pollution resistance, and long serve life for water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a hydrophilic polyethylene hollow fiber microporous filter membrane material and a preparation method thereof. Background technique [0002] Polyethylene is a general-purpose polymer with excellent chemical and thermal stability and good mechanical properties. It can be prepared as a microporous membrane filter material with separation function. Compared with polyethersulfone, polysulfone, cellulose, poly Vinylidene fluoride, polyimide and other polymer separation membranes, polyethylene membrane has the advantage of low price. The most widely used and most important separation membrane in the field of membrane technology is the membrane for water treatment. The realization of polyethylene separation membrane for water treatment needs to solve the two problems of membrane structure control and membrane hydrophilization. In terms of membrane structure cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/08
Inventor 朱宝库张春芳徐又一杜春慧张梅
Owner ZHEJIANG UNIV
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