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Preparation method of polypropylene hollow fiber nanofiltration membrane

A technology of polypropylene and nanofiltration membranes, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of the composite membrane functional layer being easily damaged, weak membrane strength, and falling off, and achieve low cost, The production process is simple and the effect of high strength

Inactive Publication Date: 2018-01-05
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of polypropylene hollow fiber nanofiltration membrane, which has simple manufacturing process, no pollution in the whole preparation process, good environmental protection, low cost, high membrane strength, and solves the problem that the functional layer of the composite membrane is easily damaged. Breakage or peeling, problems with weak film strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 of the present invention: the preparation method of polypropylene hollow fiber nanofiltration membrane comprises the steps:

[0014] 1) The polypropylene raw material is heated and extruded through the extruder, and then extruded from the spinneret. The extruded material enters the cooling bath (the cooling bath is water) after passing through the air gap with a length of 3m, and finally is drawn by the winding equipment Obtain polypropylene as-spun fiber, take-up speed is 140m / min;

[0015] 2) Insulate the as-spun polypropylene fiber for 1 hour in a thermal environment with a temperature of 110° C. to obtain a hard elastic polypropylene hollow fiber;

[0016] 3) Stretch the hard elastic polypropylene hollow fiber, the cold stretching ratio is between 5%, the hot stretching ratio is 30%, the stretching rate is 20mm / min, the cold stretching temperature is 20°C, and the hot stretching The temperature is 110° C.; after stretching, it is heat-set at 110° C. fo...

Embodiment 2

[0018] Embodiment 2 of the present invention: the preparation method of polypropylene hollow fiber nanofiltration membrane comprises the steps:

[0019] 1) The polypropylene raw material is heated and extruded through the extruder, and then extruded from the spinneret. The extruded material enters the cooling bath (the cooling bath is glycerin) after passing through the air gap with a length of 1m, and finally is drawn by the winding equipment Obtain polypropylene as-spun fiber, the winding speed is 350m / min;

[0020] 2) Insulate the as-spun polypropylene fiber for 1 hour in a thermal environment at a temperature of 140° C. to obtain a hard elastic polypropylene hollow fiber;

[0021] 3) Stretch the hard elastic polypropylene hollow fiber, the cold stretching ratio is between 15%, the hot stretching ratio is 40%, the stretching rate is 10mm / min, the cold stretching temperature is 25°C, and the hot stretching The temperature is 120° C.; after stretching, it is heat-set at 120°...

Embodiment 3

[0023] Embodiment 3 of the present invention: the preparation method of polypropylene hollow fiber nanofiltration membrane comprises the steps:

[0024] 1) The polypropylene raw material is heated and extruded through the extruder, and then extruded from the spinneret. The extruded material enters the cooling bath (the cooling bath is cyclohexane) after passing through an air gap with a length of 1.7m, and finally is wound The equipment is drawn to obtain polypropylene as-spun fibers, and the winding speed is 420m / min;

[0025] 2) Insulate the as-spun polypropylene fiber for 1 hour in a thermal environment at a temperature of 140° C. to obtain a hard elastic polypropylene hollow fiber;

[0026] 3) Stretch the hard elastic polypropylene hollow fiber, the cold stretching ratio is between 20%, the hot stretching ratio is 45%, the stretching rate is 30mm / min, the cold stretching temperature is 25°C, and the hot stretching The temperature is 140° C.; after stretching, it is heat-s...

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Abstract

The invention discloses a preparation method of a polypropylene hollow fiber nanofiltration membrane. According to the invention, the polypropylene hollow fiber nanofiltration membrane is designed andprepared by using a melt-spinning-stretching method; the nanofiltration membrane has the characteristics of high intensity and integration of a supporting layer and a functional layer; in the preparing process, the suitable functional layer can be obtained by controlling factors such as ingredients of a spinning cooling bath, an air gap length and a stretching ratio, and by controlling the stretching ratio and a stretching rate, an aperture size and a porosity of micropores are controlled. The nanofiltration membrane is simple in preparation process, has no pollution in the whole preparing process and is low in cost; the obtained membrane is high in intensity and has a rejection rate of 98 to 100% for bovine serum albumin, the rejection rate of 60 to 90% for sodium sulfate and a flux of 5to 50L / m<2>h under a pressure of 0.1MPa; and the membrane can be used for the fields of fine separation, sewage treatment, dye desalination and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of a polypropylene hollow fiber nanofiltration membrane. Background technique [0002] The pore size of nanofiltration membrane is between 1nm and 10nm. According to the pore size, it is a separation membrane between ultrafiltration and reverse osmosis. In the 1970s, J.E.Cadotte began to study it, and realized industrialization in the 1980s. At first, the nanofiltration process was called "hybrid filtration", and the nanofiltration membrane was also called low-pressure reverse osmosis membrane or loose reverse osmosis membrane. Later, the concept of "nanofiltration" was proposed by the American Film-Tech company, and it has been used until now. Domestic research on nanofiltration membranes began when Academician Gao Congjie introduced the progress of nanofiltration technology at the National Membrane Academic Exchange Conference. [0003] Current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/08B01D71/26
CPCY02A20/131
Inventor 韦福建邵会菊张凯舟武晓张敏敏姚勇靳进波罗大军
Owner GUIZHOU MATERIAL IND TECH INSTITUE