Polyethylene microporous membrane, polyvinyl nanofiltration membrane and preparation method thereof

A polyethylene-based nano and microporous membrane technology, applied in the field of nanofiltration membranes, can solve the problems of poor membrane strength and low service life, and achieve the effects of long service life, high porosity and concentrated pore size distribution

Pending Publication Date: 2021-03-12
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The use of polyethylene microporous membranes in the preparation of nanofiltration and reverse osmosis membranes is an emerging hotspot, but the quality of polyethylene materials directly affects the performance of the prepared nanofiltration membranes, resulting in problems such as poor membrane strength and low life.

Method used

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  • Polyethylene microporous membrane, polyvinyl nanofiltration membrane and preparation method thereof
  • Polyethylene microporous membrane, polyvinyl nanofiltration membrane and preparation method thereof
  • Polyethylene microporous membrane, polyvinyl nanofiltration membrane and preparation method thereof

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preparation example Construction

[0046] The specific embodiment of the present invention also provides a kind of preparation method of polyvinyl nanofiltration membrane, and this method comprises the steps:

[0047] Submerging the polyethylene microporous membrane that can be used to prepare nanofiltration membranes described in any of the above schemes in the polyamine aqueous phase solution;

[0048] The submerged membrane is taken out from the water phase, the excess water phase solution is removed, and then immersed in the oil phase solution containing polyacyl chloride monomers;

[0049] After the interfacial polymerization reaction, take it out, and then remove the excess oil phase solution to obtain a polyethylene-based nascent nanofiltration membrane with a functional nano-separation layer;

[0050] The primary nanofiltration membrane obtained in the above steps is subjected to heat treatment, and the polyethylene-based nanofiltration membrane is obtained after cleaning.

[0051] Further, the composi...

Embodiment 1

[0080] Use 32% polyethylene as raw material (high molecular weight polyethylene accounts for 40% of the blended polyethylene raw material), add 67% paraffin oil as diluent, 1% dibutyl hydroxytoluene as antioxidant, 200 ° C Mix and melt at low temperature, then extrude through twin-screw, and cast at 100°C until cooling and mixing. The films were stretched 8.2 times in the transverse direction and 6.8 times in the longitudinal direction. The membrane was extracted in dichloromethane, then heat-set at 80° C., and wound to obtain a polyethylene microporous membrane 1 . The polyethylene microporous membrane is immersed in the polyamine aqueous phase solution, which contains piperazine (mass concentration 2%), and the acid acceptor is triethylamine (mass concentration 0.75%) and sodium lauryl sulfate (mass concentration 0.1%) Take out afterward, remove superfluous liquid on the surface, immerse in polyacyl chloride oil phase solution, wherein polyacyl chloride monomer is trimesoyl...

Embodiment 2

[0082] The total mass fraction of 28% polyethylene is used as raw material (high molecular weight polyethylene accounts for 20% of the blended polyethylene raw material), the total mass of 2% phosphite is antioxidant, and the rest of the diluent is paraffin oil, mixed and melted at 240 ° C , and then extruded through twin-screws, casting at 80°C until cooling and mixing. The films were stretched 8.8 times in the transverse direction and 7.4 times in the longitudinal direction. The membrane was extracted in dichloromethane, then heat-set at 80° C., and wound to obtain a polyethylene microporous membrane 2 .

[0083] According to the method for preparing the polyethylene-based nanofiltration membrane in Example 1, the polyethylene-based nanofiltration membrane B2 was prepared.

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Abstract

The invention relates to the technical field of nanofiltration membranes, and particularly discloses a polyethylene microporous membrane capable of being used for preparing a nanofiltration membrane,a polyvinyl nanofiltration membrane and a preparation method thereof. Compared with a nanofiltration membrane prepared from a commercialized polyethylene membrane on the market, the nanofiltration membrane prepared from the polyethylene microporous membrane with a limited range of the physical parameters is high in flux, high in bivalent salt retention rate, high in monovalent salt retention rate,high in tap water retention rate and more excellent in overall filtering performance, and can be applied to various scenes with different solvents, the flux is kept stable, no dead point or damage occurs on the membrane surface, the tolerance limit is reached only after 70DEG C, the tolerance performance is excellent, the service life is long, the market competitiveness is extremely high, and theapplication prospect is very considerable.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a polyethylene microporous membrane that can be used for preparing nanofiltration membranes, a polyethylene-based nanofiltration membrane and a preparation method thereof. Background technique [0002] Since membrane separation technology entered industrial production in the last century, new technologies have emerged continuously and have been widely used in more and more fields, reflecting huge economic benefits, and the interpretation of the process to the concept of green and sustainable development will be It is the main theme of the development of contemporary and future industrial civilization. [0003] Although the membrane filtration efficiency is high, it is economical and environmentally friendly, but the traditional polymer materials have poor strength and pollution resistance, and the service life is short, which leads to the frequent replacement of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D67/00
CPCB01D67/0006B01D71/26
Inventor 程跃王英杰邱长泉庄志虞少波
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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