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Diatomite/polypropylene blended hollow fiber membrane and preparation method thereof

A technology of diatomite and fiber membranes, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve problems such as low oil absorption rate, non-reusable use, complex components, etc., achieve excellent oil absorption rate and meet multiple cycles Effect of use, good porosity

Pending Publication Date: 2021-02-02
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, natural organic materials, such as: flax, cotton, milkweed, straw and wool, etc., have disadvantages such as complex composition, difficult modification, low material strength, and cannot be reused.
Inorganic materials, such as activated carbon, expanded graphite, peat, silica, organically modified clay, etc., have disadvantages such as low oil absorption rate and difficult recovery after oil absorption

Method used

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  • Diatomite/polypropylene blended hollow fiber membrane and preparation method thereof
  • Diatomite/polypropylene blended hollow fiber membrane and preparation method thereof

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Effect test

preparation example Construction

[0013] The invention provides a method for preparing a diatomite / PP blended hollow fiber membrane, comprising the following steps:

[0014] Step 1: Weigh the following raw materials according to mass percentage: diatomite 0-15%, PP85-100%.

[0015] Step 2: Mix the weighed diatomite and PP powder evenly in a high-speed mixer to obtain casting film powder.

[0016] Step 3: Put the casting film powder obtained in Step 2 into a twin-screw extruder, melt it, extrude it through a spinneret, draw it, and shape it to obtain a hollow fiber membrane.

[0017] Among them, the temperature of the extruder is controlled at 180°C, and the shaping includes two parts, heat treatment and stretching. Heat treatment: put the pulled film wire in an electric oven to improve the crystal structure; stretching: including cold stretching and hot stretching .

Embodiment 1

[0019] Weigh the following raw materials according to mass percentage: 50g of diatomite, 950g of PP, dry the materials in advance, mix the weighed materials evenly at high speed, add them to the twin-screw extruder, melt them, control the temperature at 180°C, and extrude them through the spinneret out, traction, and shaping to obtain a hollow fiber membrane. The prepared hollow fiber membrane was cast into a curtain membrane module with a porosity of 58.7%, immersed in the oil-water mixture, and after a period of adsorption, the measured oil absorption rate was 75.3%. After treatment, the backwash rate of the membrane module was 74%.

Embodiment 2

[0021] Weigh the following raw materials according to mass percentage: 100g of diatomite, 900g of PP, dry the materials in advance, mix the weighed materials evenly at high speed, add them to the twin-screw extruder, melt them, control the temperature at 180°C, and extrude them through the spinneret out, traction, and shaping to obtain a hollow fiber membrane. The prepared hollow fiber membrane was cast into a curtain membrane module with a porosity of 61.7%, immersed in the oil-water mixture, and after a period of adsorption, the measured oil absorption rate was 83.7%. After treatment, the backwash rate of the membrane module 85%.

[0022] The present invention has carried out the oil-absorbing capacity test to the hollow fiber membrane that the embodiment makes: Seen device such as figure 2 . figure 2 Middle 1 is the oil-water mixing tank, which can absorb the oil by immersing the curtain membrane module, and 2 is the oil receiving plate, and the both ends of the curtain...

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Abstract

The invention discloses a diatomite / polypropylene blended hollow fiber membrane and a preparation method thereof. According to the method, polypropylene serves as a main body, diatomite serves as an additive, and the following preparation technology is adopted: diatomite and polypropylene are weighed according to the mass percent, evenly mixed and then put into a double-screw extruder to be melted, and extruded and dragged through a spinning nozzle, and the hollow fiber membrane obtained by traction and shaping. The hollow fiber membrane prepared by the method absorbs oil by utilizing three pores including polypropylene material characteristics, tensile pore diameter and diatomite, and has the advantages of good chemical stability, high porosity, high strength, good oil absorption effect,recyclability and the like. Besides, for the membrane filaments with the oil absorption capacity reaching the limit, alkali liquor can be adopted for treating the membrane filaments, diatomite in themembrane filaments is dissolved out and leaks out of the pore diameter, and therefore oil absorption is continued.

Description

technical field [0001] The invention relates to a preparation method of a functional hollow fiber membrane, in particular to a diatomite / polypropylene (PP) blended hollow fiber membrane and a preparation method thereof. Background technique [0002] With the rapid development of the petroleum industry and the maritime oil transportation industry, marine oil spill accidents caused by accidents such as blowouts, oil spills from transport ships, ship collisions, shipwrecks, and oil pipeline leaks have occurred from time to time. The oil spill spreads very quickly on the sea surface. One cubic meter of crude oil spilled into the ocean, and after 10 minutes, it spreads into a circular spot-shaped oil film with a diameter of 48m and a thickness of 0.5mm, which brings great difficulties to the oil spill treatment. The oil film staying on the sea surface will block the normal exchange of sea air such as oxygen and carbon dioxide, which will destroy the acid-base balance of sea water...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D67/00C02F1/40
CPCB01D67/0079B01D69/08C02F1/40
Inventor 王薇张鹏
Owner TIANJIN POLYTECHNIC UNIV
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